drivers/usb/dwc2/hcd.c

   1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
   2 /*
   3  * hcd.c - DesignWare HS OTG Controller host-mode routines
   4  *
   5  * Copyright (C) 2004-2013 Synopsys, Inc.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The names of the above-listed copyright holders may not be used
  17  *    to endorse or promote products derived from this software without
  18  *    specific prior written permission.
  19  *
  20  * ALTERNATIVELY, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") as published by the Free Software
  22  * Foundation; either version 2 of the License, or (at your option) any
  23  * later version.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  26  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  27  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  29  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  30  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  31  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  32  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 /*
  39  * This file contains the core HCD code, and implements the Linux hc_driver
  40  * API
  41  */
  42 #include <linux/kernel.h>
  43 #include <linux/module.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/platform_device.h>
  47 #include <linux/dma-mapping.h>
  48 #include <linux/delay.h>
  49 #include <linux/io.h>
  50 #include <linux/slab.h>
  51 #include <linux/usb.h>
  52
  53 #include <linux/usb/hcd.h>
  54 #include <linux/usb/ch11.h>
  55
  56 #include "core.h"
  57 #include "hcd.h"
  58
  59 static void dwc2_port_resume(struct dwc2_hsotg *hsotg);
  60
  61 /*
  62  * =========================================================================
  63  *  Host Core Layer Functions
  64  * =========================================================================
  65  */
  66
  67 /**
  68  * dwc2_enable_common_interrupts() - Initializes the commmon interrupts,
  69  * used in both device and host modes
  70  *
  71  * @hsotg: Programming view of the DWC_otg controller
  72  */
  73 static void dwc2_enable_common_interrupts(struct dwc2_hsotg *hsotg)
  74 {
  75         u32 intmsk;
  76
  77         /* Clear any pending OTG Interrupts */
  78         dwc2_writel(0xffffffff, hsotg->regs + GOTGINT);
  79
  80         /* Clear any pending interrupts */
  81         dwc2_writel(0xffffffff, hsotg->regs + GINTSTS);
  82
  83         /* Enable the interrupts in the GINTMSK */
  84         intmsk = GINTSTS_MODEMIS | GINTSTS_OTGINT;
  85
  86         if (!hsotg->params.host_dma)
  87                 intmsk |= GINTSTS_RXFLVL;
  88         if (!hsotg->params.external_id_pin_ctl)
  89                 intmsk |= GINTSTS_CONIDSTSCHNG;
  90
  91         intmsk |= GINTSTS_WKUPINT | GINTSTS_USBSUSP |
  92                   GINTSTS_SESSREQINT;
  93
  94         if (dwc2_is_device_mode(hsotg) && hsotg->params.lpm)
  95                 intmsk |= GINTSTS_LPMTRANRCVD;
  96
  97         dwc2_writel(intmsk, hsotg->regs + GINTMSK);
  98 }
  99
 100 /*
 101  * Initializes the FSLSPClkSel field of the HCFG register depending on the
 102  * PHY type
 103  */
 104 static void dwc2_init_fs_ls_pclk_sel(struct dwc2_hsotg *hsotg)
 105 {
 106         u32 hcfg, val;
 107
 108         if ((hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI &&
 109              hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED &&
 110              hsotg->params.ulpi_fs_ls) ||
 111             hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) {
 112                 /* Full speed PHY */
 113                 val = HCFG_FSLSPCLKSEL_48_MHZ;
 114         } else {
 115                 /* High speed PHY running at full speed or high speed */
 116                 val = HCFG_FSLSPCLKSEL_30_60_MHZ;
 117         }
 118
 119         dev_dbg(hsotg->dev, "Initializing HCFG.FSLSPClkSel to %08x\n", val);
 120         hcfg = dwc2_readl(hsotg->regs + HCFG);
 121         hcfg &= ~HCFG_FSLSPCLKSEL_MASK;
 122         hcfg |= val << HCFG_FSLSPCLKSEL_SHIFT;
 123         dwc2_writel(hcfg, hsotg->regs + HCFG);
 124 }
 125
 126 static int dwc2_fs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
 127 {
 128         u32 usbcfg, ggpio, i2cctl;
 129         int retval = 0;
 130
 131         /*
 132          * core_init() is now called on every switch so only call the
 133          * following for the first time through
 134          */
 135         if (select_phy) {
 136                 dev_dbg(hsotg->dev, "FS PHY selected\n");
 137
 138                 usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
 139                 if (!(usbcfg & GUSBCFG_PHYSEL)) {
 140                         usbcfg |= GUSBCFG_PHYSEL;
 141                         dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
 142
 143                         /* Reset after a PHY select */
 144                         retval = dwc2_core_reset(hsotg, false);
 145
 146                         if (retval) {
 147                                 dev_err(hsotg->dev,
 148                                         "%s: Reset failed, aborting", __func__);
 149                                 return retval;
 150                         }
 151                 }
 152
 153                 if (hsotg->params.activate_stm_fs_transceiver) {
 154                         ggpio = dwc2_readl(hsotg->regs + GGPIO);
 155                         if (!(ggpio & GGPIO_STM32_OTG_GCCFG_PWRDWN)) {
 156                                 dev_dbg(hsotg->dev, "Activating transceiver\n");
 157                                 /*
 158                                  * STM32F4x9 uses the GGPIO register as general
 159                                  * core configuration register.
 160                                  */
 161                                 ggpio |= GGPIO_STM32_OTG_GCCFG_PWRDWN;
 162                                 dwc2_writel(ggpio, hsotg->regs + GGPIO);
 163                         }
 164                 }
 165         }
 166
 167         /*
 168          * Program DCFG.DevSpd or HCFG.FSLSPclkSel to 48Mhz in FS. Also
 169          * do this on HNP Dev/Host mode switches (done in dev_init and
 170          * host_init).
 171          */
 172         if (dwc2_is_host_mode(hsotg))
 173                 dwc2_init_fs_ls_pclk_sel(hsotg);
 174
 175         if (hsotg->params.i2c_enable) {
 176                 dev_dbg(hsotg->dev, "FS PHY enabling I2C\n");
 177
 178                 /* Program GUSBCFG.OtgUtmiFsSel to I2C */
 179                 usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
 180                 usbcfg |= GUSBCFG_OTG_UTMI_FS_SEL;
 181                 dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
 182
 183                 /* Program GI2CCTL.I2CEn */
 184                 i2cctl = dwc2_readl(hsotg->regs + GI2CCTL);
 185                 i2cctl &= ~GI2CCTL_I2CDEVADDR_MASK;
 186                 i2cctl |= 1 << GI2CCTL_I2CDEVADDR_SHIFT;
 187                 i2cctl &= ~GI2CCTL_I2CEN;
 188                 dwc2_writel(i2cctl, hsotg->regs + GI2CCTL);
 189                 i2cctl |= GI2CCTL_I2CEN;
 190                 dwc2_writel(i2cctl, hsotg->regs + GI2CCTL);
 191         }
 192
 193         return retval;
 194 }
 195
 196 static int dwc2_hs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
 197 {
 198         u32 usbcfg, usbcfg_old;
 199         int retval = 0;
 200
 201         if (!select_phy)
 202                 return 0;
 203
 204         usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
 205         usbcfg_old = usbcfg;
 206
 207         /*
 208          * HS PHY parameters. These parameters are preserved during soft reset
 209          * so only program the first time. Do a soft reset immediately after
 210          * setting phyif.
 211          */
 212         switch (hsotg->params.phy_type) {
 213         case DWC2_PHY_TYPE_PARAM_ULPI:
 214                 /* ULPI interface */
 215                 dev_dbg(hsotg->dev, "HS ULPI PHY selected\n");
 216                 usbcfg |= GUSBCFG_ULPI_UTMI_SEL;
 217                 usbcfg &= ~(GUSBCFG_PHYIF16 | GUSBCFG_DDRSEL);
 218                 if (hsotg->params.phy_ulpi_ddr)
 219                         usbcfg |= GUSBCFG_DDRSEL;
 220
 221                 /* Set external VBUS indicator as needed. */
 222                 if (hsotg->params.oc_disable)
 223                         usbcfg |= (GUSBCFG_ULPI_INT_VBUS_IND |
 224                                    GUSBCFG_INDICATORPASSTHROUGH);
 225                 break;
 226         case DWC2_PHY_TYPE_PARAM_UTMI:
 227                 /* UTMI+ interface */
 228                 dev_dbg(hsotg->dev, "HS UTMI+ PHY selected\n");
 229                 usbcfg &= ~(GUSBCFG_ULPI_UTMI_SEL | GUSBCFG_PHYIF16);
 230                 if (hsotg->params.phy_utmi_width == 16)
 231                         usbcfg |= GUSBCFG_PHYIF16;
 232                 break;
 233         default:
 234                 dev_err(hsotg->dev, "FS PHY selected at HS!\n");
 235                 break;
 236         }
 237
 238         if (usbcfg != usbcfg_old) {
 239                 dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
 240
 241                 /* Reset after setting the PHY parameters */
 242                 retval = dwc2_core_reset(hsotg, false);
 243                 if (retval) {
 244                         dev_err(hsotg->dev,
 245                                 "%s: Reset failed, aborting", __func__);
 246                         return retval;
 247                 }
 248         }
 249
 250         return retval;
 251 }
 252
 253 static int dwc2_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
 254 {
 255         u32 usbcfg;
 256         int retval = 0;
 257
 258         if ((hsotg->params.speed == DWC2_SPEED_PARAM_FULL ||
 259              hsotg->params.speed == DWC2_SPEED_PARAM_LOW) &&
 260             hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) {
 261                 /* If FS/LS mode with FS/LS PHY */
 262                 retval = dwc2_fs_phy_init(hsotg, select_phy);
 263                 if (retval)
 264                         return retval;
 265         } else {
 266                 /* High speed PHY */
 267                 retval = dwc2_hs_phy_init(hsotg, select_phy);
 268                 if (retval)
 269                         return retval;
 270         }
 271
 272         if (hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI &&
 273             hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED &&
 274             hsotg->params.ulpi_fs_ls) {
 275                 dev_dbg(hsotg->dev, "Setting ULPI FSLS\n");
 276                 usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
 277                 usbcfg |= GUSBCFG_ULPI_FS_LS;
 278                 usbcfg |= GUSBCFG_ULPI_CLK_SUSP_M;
 279                 dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
 280         } else {
 281                 usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
 282                 usbcfg &= ~GUSBCFG_ULPI_FS_LS;
 283                 usbcfg &= ~GUSBCFG_ULPI_CLK_SUSP_M;
 284                 dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
 285         }
 286
 287         return retval;
 288 }
 289
 290 static int dwc2_gahbcfg_init(struct dwc2_hsotg *hsotg)
 291 {
 292         u32 ahbcfg = dwc2_readl(hsotg->regs + GAHBCFG);
 293
 294         switch (hsotg->hw_params.arch) {
 295         case GHWCFG2_EXT_DMA_ARCH:
 296                 dev_err(hsotg->dev, "External DMA Mode not supported\n");
 297                 return -EINVAL;
 298
 299         case GHWCFG2_INT_DMA_ARCH:
 300                 dev_dbg(hsotg->dev, "Internal DMA Mode\n");
 301                 if (hsotg->params.ahbcfg != -1) {
 302                         ahbcfg &= GAHBCFG_CTRL_MASK;
 303                         ahbcfg |= hsotg->params.ahbcfg &
 304                                   ~GAHBCFG_CTRL_MASK;
 305                 }
 306                 break;
 307
 308         case GHWCFG2_SLAVE_ONLY_ARCH:
 309         default:
 310                 dev_dbg(hsotg->dev, "Slave Only Mode\n");
 311                 break;
 312         }
 313
 314         if (hsotg->params.host_dma)
 315                 ahbcfg |= GAHBCFG_DMA_EN;
 316         else
 317                 hsotg->params.dma_desc_enable = false;
 318
 319         dwc2_writel(ahbcfg, hsotg->regs + GAHBCFG);
 320
 321         return 0;
 322 }
 323
 324 static void dwc2_gusbcfg_init(struct dwc2_hsotg *hsotg)
 325 {
 326         u32 usbcfg;
 327
 328         usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
 329         usbcfg &= ~(GUSBCFG_HNPCAP | GUSBCFG_SRPCAP);
 330
 331         switch (hsotg->hw_params.op_mode) {
 332         case GHWCFG2_OP_MODE_HNP_SRP_CAPABLE:
 333                 if (hsotg->params.otg_cap ==
 334                                 DWC2_CAP_PARAM_HNP_SRP_CAPABLE)
 335                         usbcfg |= GUSBCFG_HNPCAP;
 336                 if (hsotg->params.otg_cap !=
 337                                 DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE)
 338                         usbcfg |= GUSBCFG_SRPCAP;
 339                 break;
 340
 341         case GHWCFG2_OP_MODE_SRP_ONLY_CAPABLE:
 342         case GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE:
 343         case GHWCFG2_OP_MODE_SRP_CAPABLE_HOST:
 344                 if (hsotg->params.otg_cap !=
 345                                 DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE)
 346                         usbcfg |= GUSBCFG_SRPCAP;
 347                 break;
 348
 349         case GHWCFG2_OP_MODE_NO_HNP_SRP_CAPABLE:
 350         case GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE:
 351         case GHWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST:
 352         default:
 353                 break;
 354         }
 355
 356         dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
 357 }
 358
 359 static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
 360 {
 361         int ret;
 362
 363         hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
 364         if (IS_ERR(hsotg->vbus_supply)) {
 365                 ret = PTR_ERR(hsotg->vbus_supply);
 366                 hsotg->vbus_supply = NULL;
 367                 return ret == -ENODEV ? 0 : ret;
 368         }
 369
 370         return regulator_enable(hsotg->vbus_supply);
 371 }
 372
 373 static int dwc2_vbus_supply_exit(struct dwc2_hsotg *hsotg)
 374 {
 375         if (hsotg->vbus_supply)
 376                 return regulator_disable(hsotg->vbus_supply);
 377
 378         return 0;
 379 }
 380
 381 /**
 382  * dwc2_enable_host_interrupts() - Enables the Host mode interrupts
 383  *
 384  * @hsotg: Programming view of DWC_otg controller
 385  */
 386 static void dwc2_enable_host_interrupts(struct dwc2_hsotg *hsotg)
 387 {
 388         u32 intmsk;
 389
 390         dev_dbg(hsotg->dev, "%s()\n", __func__);
 391
 392         /* Disable all interrupts */
 393         dwc2_writel(0, hsotg->regs + GINTMSK);
 394         dwc2_writel(0, hsotg->regs + HAINTMSK);
 395
 396         /* Enable the common interrupts */
 397         dwc2_enable_common_interrupts(hsotg);
 398
 399         /* Enable host mode interrupts without disturbing common interrupts */
 400         intmsk = dwc2_readl(hsotg->regs + GINTMSK);
 401         intmsk |= GINTSTS_DISCONNINT | GINTSTS_PRTINT | GINTSTS_HCHINT;
 402         dwc2_writel(intmsk, hsotg->regs + GINTMSK);
 403 }
 404
 405 /**
 406  * dwc2_disable_host_interrupts() - Disables the Host Mode interrupts
 407  *
 408  * @hsotg: Programming view of DWC_otg controller
 409  */
 410 static void dwc2_disable_host_interrupts(struct dwc2_hsotg *hsotg)
 411 {
 412         u32 intmsk = dwc2_readl(hsotg->regs + GINTMSK);
 413
 414         /* Disable host mode interrupts without disturbing common interrupts */
 415         intmsk &= ~(GINTSTS_SOF | GINTSTS_PRTINT | GINTSTS_HCHINT |
 416                     GINTSTS_PTXFEMP | GINTSTS_NPTXFEMP | GINTSTS_DISCONNINT);
 417         dwc2_writel(intmsk, hsotg->regs + GINTMSK);
 418 }
 419
 420 /*
 421  * dwc2_calculate_dynamic_fifo() - Calculates the default fifo size
 422  * For system that have a total fifo depth that is smaller than the default
 423  * RX + TX fifo size.
 424  *
 425  * @hsotg: Programming view of DWC_otg controller
 426  */
 427 static void dwc2_calculate_dynamic_fifo(struct dwc2_hsotg *hsotg)
 428 {
 429         struct dwc2_core_params *params = &hsotg->params;
 430         struct dwc2_hw_params *hw = &hsotg->hw_params;
 431         u32 rxfsiz, nptxfsiz, ptxfsiz, total_fifo_size;
 432
 433         total_fifo_size = hw->total_fifo_size;
 434         rxfsiz = params->host_rx_fifo_size;
 435         nptxfsiz = params->host_nperio_tx_fifo_size;
 436         ptxfsiz = params->host_perio_tx_fifo_size;
 437
 438         /*
 439          * Will use Method 2 defined in the DWC2 spec: minimum FIFO depth
 440          * allocation with support for high bandwidth endpoints. Synopsys
 441          * defines MPS(Max Packet size) for a periodic EP=1024, and for
 442          * non-periodic as 512.
 443          */
 444         if (total_fifo_size < (rxfsiz + nptxfsiz + ptxfsiz)) {
 445                 /*
 446                  * For Buffer DMA mode/Scatter Gather DMA mode
 447                  * 2 * ((Largest Packet size / 4) + 1 + 1) + n
 448                  * with n = number of host channel.
 449                  * 2 * ((1024/4) + 2) = 516
 450                  */
 451                 rxfsiz = 516 + hw->host_channels;
 452
 453                 /*
 454                  * min non-periodic tx fifo depth
 455                  * 2 * (largest non-periodic USB packet used / 4)
 456                  * 2 * (512/4) = 256
 457                  */
 458                 nptxfsiz = 256;
 459
 460                 /*
 461                  * min periodic tx fifo depth
 462                  * (largest packet size*MC)/4
 463                  * (1024 * 3)/4 = 768
 464                  */
 465                 ptxfsiz = 768;
 466
 467                 params->host_rx_fifo_size = rxfsiz;
 468                 params->host_nperio_tx_fifo_size = nptxfsiz;
 469                 params->host_perio_tx_fifo_size = ptxfsiz;
 470         }
 471
 472         /*
 473          * If the summation of RX, NPTX and PTX fifo sizes is still
 474          * bigger than the total_fifo_size, then we have a problem.
 475          *
 476          * We won't be able to allocate as many endpoints. Right now,
 477          * we're just printing an error message, but ideally this FIFO
 478          * allocation algorithm would be improved in the future.
 479          *
 480          * FIXME improve this FIFO allocation algorithm.
 481          */
 482         if (unlikely(total_fifo_size < (rxfsiz + nptxfsiz + ptxfsiz)))
 483                 dev_err(hsotg->dev, "invalid fifo sizes\n");
 484 }
 485
 486 static void dwc2_config_fifos(struct dwc2_hsotg *hsotg)
 487 {
 488         struct dwc2_core_params *params = &hsotg->params;
 489         u32 nptxfsiz, hptxfsiz, dfifocfg, grxfsiz;
 490
 491         if (!params->enable_dynamic_fifo)
 492                 return;
 493
 494         dwc2_calculate_dynamic_fifo(hsotg);
 495
 496         /* Rx FIFO */
 497         grxfsiz = dwc2_readl(hsotg->regs + GRXFSIZ);
 498         dev_dbg(hsotg->dev, "initial grxfsiz=%08x\n", grxfsiz);
 499         grxfsiz &= ~GRXFSIZ_DEPTH_MASK;
 500         grxfsiz |= params->host_rx_fifo_size <<
 501                    GRXFSIZ_DEPTH_SHIFT & GRXFSIZ_DEPTH_MASK;
 502         dwc2_writel(grxfsiz, hsotg->regs + GRXFSIZ);
 503         dev_dbg(hsotg->dev, "new grxfsiz=%08x\n",
 504                 dwc2_readl(hsotg->regs + GRXFSIZ));
 505
 506         /* Non-periodic Tx FIFO */
 507         dev_dbg(hsotg->dev, "initial gnptxfsiz=%08x\n",
 508                 dwc2_readl(hsotg->regs + GNPTXFSIZ));
 509         nptxfsiz = params->host_nperio_tx_fifo_size <<
 510                    FIFOSIZE_DEPTH_SHIFT & FIFOSIZE_DEPTH_MASK;
 511         nptxfsiz |= params->host_rx_fifo_size <<
 512                     FIFOSIZE_STARTADDR_SHIFT & FIFOSIZE_STARTADDR_MASK;
 513         dwc2_writel(nptxfsiz, hsotg->regs + GNPTXFSIZ);
 514         dev_dbg(hsotg->dev, "new gnptxfsiz=%08x\n",
 515                 dwc2_readl(hsotg->regs + GNPTXFSIZ));
 516
 517         /* Periodic Tx FIFO */
 518         dev_dbg(hsotg->dev, "initial hptxfsiz=%08x\n",
 519                 dwc2_readl(hsotg->regs + HPTXFSIZ));
 520         hptxfsiz = params->host_perio_tx_fifo_size <<
 521                    FIFOSIZE_DEPTH_SHIFT & FIFOSIZE_DEPTH_MASK;
 522         hptxfsiz |= (params->host_rx_fifo_size +
 523                      params->host_nperio_tx_fifo_size) <<
 524                     FIFOSIZE_STARTADDR_SHIFT & FIFOSIZE_STARTADDR_MASK;
 525         dwc2_writel(hptxfsiz, hsotg->regs + HPTXFSIZ);
 526         dev_dbg(hsotg->dev, "new hptxfsiz=%08x\n",
 527                 dwc2_readl(hsotg->regs + HPTXFSIZ));
 528
 529         if (hsotg->params.en_multiple_tx_fifo &&
 530             hsotg->hw_params.snpsid >= DWC2_CORE_REV_2_91a) {
 531                 /*
 532                  * This feature was implemented in 2.91a version
 533                  * Global DFIFOCFG calculation for Host mode -
 534                  * include RxFIFO, NPTXFIFO and HPTXFIFO
 535                  */
 536                 dfifocfg = dwc2_readl(hsotg->regs + GDFIFOCFG);
 537                 dfifocfg &= ~GDFIFOCFG_EPINFOBASE_MASK;
 538                 dfifocfg |= (params->host_rx_fifo_size +
 539                              params->host_nperio_tx_fifo_size +
 540                              params->host_perio_tx_fifo_size) <<
 541                             GDFIFOCFG_EPINFOBASE_SHIFT &
 542                             GDFIFOCFG_EPINFOBASE_MASK;
 543                 dwc2_writel(dfifocfg, hsotg->regs + GDFIFOCFG);
 544         }
 545 }
 546
 547 /**
 548  * dwc2_calc_frame_interval() - Calculates the correct frame Interval value for
 549  * the HFIR register according to PHY type and speed
 550  *
 551  * @hsotg: Programming view of DWC_otg controller
 552  *
 553  * NOTE: The caller can modify the value of the HFIR register only after the
 554  * Port Enable bit of the Host Port Control and Status register (HPRT.EnaPort)
 555  * has been set
 556  */
 557 u32 dwc2_calc_frame_interval(struct dwc2_hsotg *hsotg)
 558 {
 559         u32 usbcfg;
 560         u32 hprt0;
 561         int clock = 60; /* default value */
 562
 563         usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
 564         hprt0 = dwc2_readl(hsotg->regs + HPRT0);
 565
 566         if (!(usbcfg & GUSBCFG_PHYSEL) && (usbcfg & GUSBCFG_ULPI_UTMI_SEL) &&
 567             !(usbcfg & GUSBCFG_PHYIF16))
 568                 clock = 60;
 569         if ((usbcfg & GUSBCFG_PHYSEL) && hsotg->hw_params.fs_phy_type ==
 570             GHWCFG2_FS_PHY_TYPE_SHARED_ULPI)
 571                 clock = 48;
 572         if (!(usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) &&
 573             !(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && (usbcfg & GUSBCFG_PHYIF16))
 574                 clock = 30;
 575         if (!(usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) &&
 576             !(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && !(usbcfg & GUSBCFG_PHYIF16))
 577                 clock = 60;
 578         if ((usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) &&
 579             !(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && (usbcfg & GUSBCFG_PHYIF16))
 580                 clock = 48;
 581         if ((usbcfg & GUSBCFG_PHYSEL) && !(usbcfg & GUSBCFG_PHYIF16) &&
 582             hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_SHARED_UTMI)
 583                 clock = 48;
 584         if ((usbcfg & GUSBCFG_PHYSEL) &&
 585             hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED)
 586                 clock = 48;
 587
 588         if ((hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT == HPRT0_SPD_HIGH_SPEED)
 589                 /* High speed case */
 590                 return 125 * clock - 1;
 591
 592         /* FS/LS case */
 593         return 1000 * clock - 1;
 594 }
 595
 596 /**
 597  * dwc2_read_packet() - Reads a packet from the Rx FIFO into the destination
 598  * buffer
 599  *
 600  * @hsotg: Programming view of DWC_otg controller
 601  * @dest:    Destination buffer for the packet
 602  * @bytes:   Number of bytes to copy to the destination
 603  */
 604 void dwc2_read_packet(struct dwc2_hsotg *hsotg, u8 *dest, u16 bytes)
 605 {
 606         u32 __iomem *fifo = hsotg->regs + HCFIFO(0);
 607         u32 *data_buf = (u32 *)dest;
 608         int word_count = (bytes + 3) / 4;
 609         int i;
 610
 611         /*
 612          * Todo: Account for the case where dest is not dword aligned. This
 613          * requires reading data from the FIFO into a u32 temp buffer, then
 614          * moving it into the data buffer.
 615          */
 616
 617         dev_vdbg(hsotg->dev, "%s(%p,%p,%d)\n", __func__, hsotg, dest, bytes);
 618
 619         for (i = 0; i < word_count; i++, data_buf++)
 620                 *data_buf = dwc2_readl(fifo);
 621 }
 622
 623 /**
 624  * dwc2_dump_channel_info() - Prints the state of a host channel
 625  *
 626  * @hsotg: Programming view of DWC_otg controller
 627  * @chan:  Pointer to the channel to dump
 628  *
 629  * Must be called with interrupt disabled and spinlock held
 630  *
 631  * NOTE: This function will be removed once the peripheral controller code
 632  * is integrated and the driver is stable
 633  */
 634 static void dwc2_dump_channel_info(struct dwc2_hsotg *hsotg,
 635                                    struct dwc2_host_chan *chan)
 636 {
 637 #ifdef VERBOSE_DEBUG
 638         int num_channels = hsotg->params.host_channels;
 639         struct dwc2_qh *qh;
 640         u32 hcchar;
 641         u32 hcsplt;
 642         u32 hctsiz;
 643         u32 hc_dma;
 644         int i;
 645
 646         if (!chan)
 647                 return;
 648
 649         hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
 650         hcsplt = dwc2_readl(hsotg->regs + HCSPLT(chan->hc_num));
 651         hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chan->hc_num));
 652         hc_dma = dwc2_readl(hsotg->regs + HCDMA(chan->hc_num));
 653
 654         dev_dbg(hsotg->dev, "  Assigned to channel %p:\n", chan);
 655         dev_dbg(hsotg->dev, "    hcchar 0x%08x, hcsplt 0x%08x\n",
 656                 hcchar, hcsplt);
 657         dev_dbg(hsotg->dev, "    hctsiz 0x%08x, hc_dma 0x%08x\n",
 658                 hctsiz, hc_dma);
 659         dev_dbg(hsotg->dev, "    dev_addr: %d, ep_num: %d, ep_is_in: %d\n",
 660                 chan->dev_addr, chan->ep_num, chan->ep_is_in);
 661         dev_dbg(hsotg->dev, "    ep_type: %d\n", chan->ep_type);
 662         dev_dbg(hsotg->dev, "    max_packet: %d\n", chan->max_packet);
 663         dev_dbg(hsotg->dev, "    data_pid_start: %d\n", chan->data_pid_start);
 664         dev_dbg(hsotg->dev, "    xfer_started: %d\n", chan->xfer_started);
 665         dev_dbg(hsotg->dev, "    halt_status: %d\n", chan->halt_status);
 666         dev_dbg(hsotg->dev, "    xfer_buf: %p\n", chan->xfer_buf);
 667         dev_dbg(hsotg->dev, "    xfer_dma: %08lx\n",
 668                 (unsigned long)chan->xfer_dma);
 669         dev_dbg(hsotg->dev, "    xfer_len: %d\n", chan->xfer_len);
 670         dev_dbg(hsotg->dev, "    qh: %p\n", chan->qh);
 671         dev_dbg(hsotg->dev, "  NP inactive sched:\n");
 672         list_for_each_entry(qh, &hsotg->non_periodic_sched_inactive,
 673                             qh_list_entry)
 674                 dev_dbg(hsotg->dev, "    %p\n", qh);
 675         dev_dbg(hsotg->dev, "  NP waiting sched:\n");
 676         list_for_each_entry(qh, &hsotg->non_periodic_sched_waiting,
 677                             qh_list_entry)
 678                 dev_dbg(hsotg->dev, "    %p\n", qh);
 679         dev_dbg(hsotg->dev, "  NP active sched:\n");
 680         list_for_each_entry(qh, &hsotg->non_periodic_sched_active,
 681                             qh_list_entry)
 682                 dev_dbg(hsotg->dev, "    %p\n", qh);
 683         dev_dbg(hsotg->dev, "  Channels:\n");
 684         for (i = 0; i < num_channels; i++) {
 685                 struct dwc2_host_chan *chan = hsotg->hc_ptr_array[i];
 686
 687                 dev_dbg(hsotg->dev, "    %2d: %p\n", i, chan);
 688         }
 689 #endif /* VERBOSE_DEBUG */
 690 }
 691
 692 static int _dwc2_hcd_start(struct usb_hcd *hcd);
 693
 694 static void dwc2_host_start(struct dwc2_hsotg *hsotg)
 695 {
 696         struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);
 697
 698         hcd->self.is_b_host = dwc2_hcd_is_b_host(hsotg);
 699         _dwc2_hcd_start(hcd);
 700 }
 701
 702 static void dwc2_host_disconnect(struct dwc2_hsotg *hsotg)
 703 {
 704         struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);
 705
 706         hcd->self.is_b_host = 0;
 707 }
 708
 709 static void dwc2_host_hub_info(struct dwc2_hsotg *hsotg, void *context,
 710                                int *hub_addr, int *hub_port)
 711 {
 712         struct urb *urb = context;
 713
 714         if (urb->dev->tt)
 715                 *hub_addr = urb->dev->tt->hub->devnum;
 716         else
 717                 *hub_addr = 0;
 718         *hub_port = urb->dev->ttport;
 719 }
 720
 721 /*
 722  * =========================================================================
 723  *  Low Level Host Channel Access Functions
 724  * =========================================================================
 725  */
 726
 727 static void dwc2_hc_enable_slave_ints(struct dwc2_hsotg *hsotg,
 728                                       struct dwc2_host_chan *chan)
 729 {
 730         u32 hcintmsk = HCINTMSK_CHHLTD;
 731
 732         switch (chan->ep_type) {
 733         case USB_ENDPOINT_XFER_CONTROL:
 734         case USB_ENDPOINT_XFER_BULK:
 735                 dev_vdbg(hsotg->dev, "control/bulk\n");
 736                 hcintmsk |= HCINTMSK_XFERCOMPL;
 737                 hcintmsk |= HCINTMSK_STALL;
 738                 hcintmsk |= HCINTMSK_XACTERR;
 739                 hcintmsk |= HCINTMSK_DATATGLERR;
 740                 if (chan->ep_is_in) {
 741                         hcintmsk |= HCINTMSK_BBLERR;
 742                 } else {
 743                         hcintmsk |= HCINTMSK_NAK;
 744                         hcintmsk |= HCINTMSK_NYET;
 745                         if (chan->do_ping)
 746                                 hcintmsk |= HCINTMSK_ACK;
 747                 }
 748
 749                 if (chan->do_split) {
 750                         hcintmsk |= HCINTMSK_NAK;
 751                         if (chan->complete_split)
 752                                 hcintmsk |= HCINTMSK_NYET;
 753                         else
 754                                 hcintmsk |= HCINTMSK_ACK;
 755                 }
 756
 757                 if (chan->error_state)
 758                         hcintmsk |= HCINTMSK_ACK;
 759                 break;
 760
 761         case USB_ENDPOINT_XFER_INT:
 762                 if (dbg_perio())
 763                         dev_vdbg(hsotg->dev, "intr\n");
 764                 hcintmsk |= HCINTMSK_XFERCOMPL;
 765                 hcintmsk |= HCINTMSK_NAK;
 766                 hcintmsk |= HCINTMSK_STALL;
 767                 hcintmsk |= HCINTMSK_XACTERR;
 768                 hcintmsk |= HCINTMSK_DATATGLERR;
 769                 hcintmsk |= HCINTMSK_FRMOVRUN;
 770
 771                 if (chan->ep_is_in)
 772                         hcintmsk |= HCINTMSK_BBLERR;
 773                 if (chan->error_state)
 774                         hcintmsk |= HCINTMSK_ACK;
 775                 if (chan->do_split) {
 776                         if (chan->complete_split)
 777                                 hcintmsk |= HCINTMSK_NYET;
 778                         else
 779                                 hcintmsk |= HCINTMSK_ACK;
 780                 }
 781                 break;
 782
 783         case USB_ENDPOINT_XFER_ISOC:
 784                 if (dbg_perio())
 785                         dev_vdbg(hsotg->dev, "isoc\n");
 786                 hcintmsk |= HCINTMSK_XFERCOMPL;
 787                 hcintmsk |= HCINTMSK_FRMOVRUN;
 788                 hcintmsk |= HCINTMSK_ACK;
 789
 790                 if (chan->ep_is_in) {
 791                         hcintmsk |= HCINTMSK_XACTERR;
 792                         hcintmsk |= HCINTMSK_BBLERR;
 793                 }
 794                 break;
 795         default:
 796                 dev_err(hsotg->dev, "## Unknown EP type ##\n");
 797                 break;
 798         }
 799
 800         dwc2_writel(hcintmsk, hsotg->regs + HCINTMSK(chan->hc_num));
 801         if (dbg_hc(chan))
 802                 dev_vdbg(hsotg->dev, "set HCINTMSK to %08x\n", hcintmsk);
 803 }
 804
 805 static void dwc2_hc_enable_dma_ints(struct dwc2_hsotg *hsotg,
 806                                     struct dwc2_host_chan *chan)
 807 {
 808         u32 hcintmsk = HCINTMSK_CHHLTD;
 809
 810         /*
 811          * For Descriptor DMA mode core halts the channel on AHB error.
 812          * Interrupt is not required.
 813          */
 814         if (!hsotg->params.dma_desc_enable) {
 815                 if (dbg_hc(chan))
 816                         dev_vdbg(hsotg->dev, "desc DMA disabled\n");
 817                 hcintmsk |= HCINTMSK_AHBERR;
 818         } else {
 819                 if (dbg_hc(chan))
 820                         dev_vdbg(hsotg->dev, "desc DMA enabled\n");
 821                 if (chan->ep_type == USB_ENDPOINT_XFER_ISOC)
 822                         hcintmsk |= HCINTMSK_XFERCOMPL;
 823         }
 824
 825         if (chan->error_state && !chan->do_split &&
 826             chan->ep_type != USB_ENDPOINT_XFER_ISOC) {
 827                 if (dbg_hc(chan))
 828                         dev_vdbg(hsotg->dev, "setting ACK\n");
 829                 hcintmsk |= HCINTMSK_ACK;
 830                 if (chan->ep_is_in) {
 831                         hcintmsk |= HCINTMSK_DATATGLERR;
 832                         if (chan->ep_type != USB_ENDPOINT_XFER_INT)
 833                                 hcintmsk |= HCINTMSK_NAK;
 834                 }
 835         }
 836
 837         dwc2_writel(hcintmsk, hsotg->regs + HCINTMSK(chan->hc_num));
 838         if (dbg_hc(chan))
 839                 dev_vdbg(hsotg->dev, "set HCINTMSK to %08x\n", hcintmsk);
 840 }
 841
 842 static void dwc2_hc_enable_ints(struct dwc2_hsotg *hsotg,
 843                                 struct dwc2_host_chan *chan)
 844 {
 845         u32 intmsk;
 846
 847         if (hsotg->params.host_dma) {
 848                 if (dbg_hc(chan))
 849                         dev_vdbg(hsotg->dev, "DMA enabled\n");
 850                 dwc2_hc_enable_dma_ints(hsotg, chan);
 851         } else {
 852                 if (dbg_hc(chan))
 853                         dev_vdbg(hsotg->dev, "DMA disabled\n");
 854                 dwc2_hc_enable_slave_ints(hsotg, chan);
 855         }
 856
 857         /* Enable the top level host channel interrupt */
 858         intmsk = dwc2_readl(hsotg->regs + HAINTMSK);
 859         intmsk |= 1 << chan->hc_num;
 860         dwc2_writel(intmsk, hsotg->regs + HAINTMSK);
 861         if (dbg_hc(chan))
 862                 dev_vdbg(hsotg->dev, "set HAINTMSK to %08x\n", intmsk);
 863
 864         /* Make sure host channel interrupts are enabled */
 865         intmsk = dwc2_readl(hsotg->regs + GINTMSK);
 866         intmsk |= GINTSTS_HCHINT;
 867         dwc2_writel(intmsk, hsotg->regs + GINTMSK);
 868         if (dbg_hc(chan))
 869                 dev_vdbg(hsotg->dev, "set GINTMSK to %08x\n", intmsk);
 870 }
 871
 872 /**
 873  * dwc2_hc_init() - Prepares a host channel for transferring packets to/from
 874  * a specific endpoint
 875  *
 876  * @hsotg: Programming view of DWC_otg controller
 877  * @chan:  Information needed to initialize the host channel
 878  *
 879  * The HCCHARn register is set up with the characteristics specified in chan.
 880  * Host channel interrupts that may need to be serviced while this transfer is
 881  * in progress are enabled.
 882  */
 883 static void dwc2_hc_init(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
 884 {
 885         u8 hc_num = chan->hc_num;
 886         u32 hcintmsk;
 887         u32 hcchar;
 888         u32 hcsplt = 0;
 889
 890         if (dbg_hc(chan))
 891                 dev_vdbg(hsotg->dev, "%s()\n", __func__);
 892
 893         /* Clear old interrupt conditions for this host channel */
 894         hcintmsk = 0xffffffff;
 895         hcintmsk &= ~HCINTMSK_RESERVED14_31;
 896         dwc2_writel(hcintmsk, hsotg->regs + HCINT(hc_num));
 897
 898         /* Enable channel interrupts required for this transfer */
 899         dwc2_hc_enable_ints(hsotg, chan);
 900
 901         /*
 902          * Program the HCCHARn register with the endpoint characteristics for
 903          * the current transfer
 904          */
 905         hcchar = chan->dev_addr << HCCHAR_DEVADDR_SHIFT & HCCHAR_DEVADDR_MASK;
 906         hcchar |= chan->ep_num << HCCHAR_EPNUM_SHIFT & HCCHAR_EPNUM_MASK;
 907         if (chan->ep_is_in)
 908                 hcchar |= HCCHAR_EPDIR;
 909         if (chan->speed == USB_SPEED_LOW)
 910                 hcchar |= HCCHAR_LSPDDEV;
 911         hcchar |= chan->ep_type << HCCHAR_EPTYPE_SHIFT & HCCHAR_EPTYPE_MASK;
 912         hcchar |= chan->max_packet << HCCHAR_MPS_SHIFT & HCCHAR_MPS_MASK;
 913         dwc2_writel(hcchar, hsotg->regs + HCCHAR(hc_num));
 914         if (dbg_hc(chan)) {
 915                 dev_vdbg(hsotg->dev, "set HCCHAR(%d) to %08x\n",
 916                          hc_num, hcchar);
 917
 918                 dev_vdbg(hsotg->dev, "%s: Channel %d\n",
 919                          __func__, hc_num);
 920                 dev_vdbg(hsotg->dev, "   Dev Addr: %d\n",
 921                          chan->dev_addr);
 922                 dev_vdbg(hsotg->dev, "   Ep Num: %d\n",
 923                          chan->ep_num);
 924                 dev_vdbg(hsotg->dev, "   Is In: %d\n",
 925                          chan->ep_is_in);
 926                 dev_vdbg(hsotg->dev, "   Is Low Speed: %d\n",
 927                          chan->speed == USB_SPEED_LOW);
 928                 dev_vdbg(hsotg->dev, "   Ep Type: %d\n",
 929                          chan->ep_type);
 930                 dev_vdbg(hsotg->dev, "   Max Pkt: %d\n",
 931                          chan->max_packet);
 932         }
 933
 934         /* Program the HCSPLT register for SPLITs */
 935         if (chan->do_split) {
 936                 if (dbg_hc(chan))
 937                         dev_vdbg(hsotg->dev,
 938                                  "Programming HC %d with split --> %s\n",
 939                                  hc_num,
 940                                  chan->complete_split ? "CSPLIT" : "SSPLIT");
 941                 if (chan->complete_split)
 942                         hcsplt |= HCSPLT_COMPSPLT;
 943                 hcsplt |= chan->xact_pos << HCSPLT_XACTPOS_SHIFT &
 944                           HCSPLT_XACTPOS_MASK;
 945                 hcsplt |= chan->hub_addr << HCSPLT_HUBADDR_SHIFT &
 946                           HCSPLT_HUBADDR_MASK;
 947                 hcsplt |= chan->hub_port << HCSPLT_PRTADDR_SHIFT &
 948                           HCSPLT_PRTADDR_MASK;
 949                 if (dbg_hc(chan)) {
 950                         dev_vdbg(hsotg->dev, "    comp split %d\n",
 951                                  chan->complete_split);
 952                         dev_vdbg(hsotg->dev, "    xact pos %d\n",
 953                                  chan->xact_pos);
 954                         dev_vdbg(hsotg->dev, "    hub addr %d\n",
 955                                  chan->hub_addr);
 956                         dev_vdbg(hsotg->dev, "    hub port %d\n",
 957                                  chan->hub_port);
 958                         dev_vdbg(hsotg->dev, "    is_in %d\n",
 959                                  chan->ep_is_in);
 960                         dev_vdbg(hsotg->dev, "    Max Pkt %d\n",
 961                                  chan->max_packet);
 962                         dev_vdbg(hsotg->dev, "    xferlen %d\n",
 963                                  chan->xfer_len);
 964                 }
 965         }
 966
 967         dwc2_writel(hcsplt, hsotg->regs + HCSPLT(hc_num));
 968 }
 969
 970 /**
 971  * dwc2_hc_halt() - Attempts to halt a host channel
 972  *
 973  * @hsotg:       Controller register interface
 974  * @chan:        Host channel to halt
 975  * @halt_status: Reason for halting the channel
 976  *
 977  * This function should only be called in Slave mode or to abort a transfer in
 978  * either Slave mode or DMA mode. Under normal circumstances in DMA mode, the
 979  * controller halts the channel when the transfer is complete or a condition
 980  * occurs that requires application intervention.
 981  *
 982  * In slave mode, checks for a free request queue entry, then sets the Channel
 983  * Enable and Channel Disable bits of the Host Channel Characteristics
 984  * register of the specified channel to intiate the halt. If there is no free
 985  * request queue entry, sets only the Channel Disable bit of the HCCHARn
 986  * register to flush requests for this channel. In the latter case, sets a
 987  * flag to indicate that the host channel needs to be halted when a request
 988  * queue slot is open.
 989  *
 990  * In DMA mode, always sets the Channel Enable and Channel Disable bits of the
 991  * HCCHARn register. The controller ensures there is space in the request
 992  * queue before submitting the halt request.
 993  *
 994  * Some time may elapse before the core flushes any posted requests for this
 995  * host channel and halts. The Channel Halted interrupt handler completes the
 996  * deactivation of the host channel.
 997  */
 998 void dwc2_hc_halt(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan,
 999                   enum dwc2_halt_status halt_status)
1000 {
1001         u32 nptxsts, hptxsts, hcchar;
1002
1003         if (dbg_hc(chan))
1004                 dev_vdbg(hsotg->dev, "%s()\n", __func__);
1005
1006         /*
1007          * In buffer DMA or external DMA mode channel can't be halted
1008          * for non-split periodic channels. At the end of the next
1009          * uframe/frame (in the worst case), the core generates a channel
1010          * halted and disables the channel automatically.
1011          */
1012         if ((hsotg->params.g_dma && !hsotg->params.g_dma_desc) ||
1013             hsotg->hw_params.arch == GHWCFG2_EXT_DMA_ARCH) {
1014                 if (!chan->do_split &&
1015                     (chan->ep_type == USB_ENDPOINT_XFER_ISOC ||
1016                      chan->ep_type == USB_ENDPOINT_XFER_INT)) {
1017                         dev_err(hsotg->dev, "%s() Channel can't be halted\n",
1018                                 __func__);
1019                         return;
1020                 }
1021         }
1022
1023         if (halt_status == DWC2_HC_XFER_NO_HALT_STATUS)
1024                 dev_err(hsotg->dev, "!!! halt_status = %d !!!\n", halt_status);
1025
1026         if (halt_status == DWC2_HC_XFER_URB_DEQUEUE ||
1027             halt_status == DWC2_HC_XFER_AHB_ERR) {
1028                 /*
1029                  * Disable all channel interrupts except Ch Halted. The QTD
1030                  * and QH state associated with this transfer has been cleared
1031                  * (in the case of URB_DEQUEUE), so the channel needs to be
1032                  * shut down carefully to prevent crashes.
1033                  */
1034                 u32 hcintmsk = HCINTMSK_CHHLTD;
1035
1036                 dev_vdbg(hsotg->dev, "dequeue/error\n");
1037                 dwc2_writel(hcintmsk, hsotg->regs + HCINTMSK(chan->hc_num));
1038
1039                 /*
1040                  * Make sure no other interrupts besides halt are currently
1041                  * pending. Handling another interrupt could cause a crash due
1042                  * to the QTD and QH state.
1043                  */
1044                 dwc2_writel(~hcintmsk, hsotg->regs + HCINT(chan->hc_num));
1045
1046                 /*
1047                  * Make sure the halt status is set to URB_DEQUEUE or AHB_ERR
1048                  * even if the channel was already halted for some other
1049                  * reason
1050                  */
1051                 chan->halt_status = halt_status;
1052
1053                 hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
1054                 if (!(hcchar & HCCHAR_CHENA)) {
1055                         /*
1056                          * The channel is either already halted or it hasn't
1057                          * started yet. In DMA mode, the transfer may halt if
1058                          * it finishes normally or a condition occurs that
1059                          * requires driver intervention. Don't want to halt
1060                          * the channel again. In either Slave or DMA mode,
1061                          * it's possible that the transfer has been assigned
1062                          * to a channel, but not started yet when an URB is
1063                          * dequeued. Don't want to halt a channel that hasn't
1064                          * started yet.
1065                          */
1066                         return;
1067                 }
1068         }
1069         if (chan->halt_pending) {
1070                 /*
1071                  * A halt has already been issued for this channel. This might
1072                  * happen when a transfer is aborted by a higher level in
1073                  * the stack.
1074                  */
1075                 dev_vdbg(hsotg->dev,
1076                          "*** %s: Channel %d, chan->halt_pending already set ***\n",
1077                          __func__, chan->hc_num);
1078                 return;
1079         }
1080
1081         hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
1082
1083         /* No need to set the bit in DDMA for disabling the channel */
1084         /* TODO check it everywhere channel is disabled */
1085         if (!hsotg->params.dma_desc_enable) {
1086                 if (dbg_hc(chan))
1087                         dev_vdbg(hsotg->dev, "desc DMA disabled\n");
1088                 hcchar |= HCCHAR_CHENA;
1089         } else {
1090                 if (dbg_hc(chan))
1091                         dev_dbg(hsotg->dev, "desc DMA enabled\n");
1092         }
1093         hcchar |= HCCHAR_CHDIS;
1094
1095         if (!hsotg->params.host_dma) {
1096                 if (dbg_hc(chan))
1097                         dev_vdbg(hsotg->dev, "DMA not enabled\n");
1098                 hcchar |= HCCHAR_CHENA;
1099
1100                 /* Check for space in the request queue to issue the halt */
1101                 if (chan->ep_type == USB_ENDPOINT_XFER_CONTROL ||
1102                     chan->ep_type == USB_ENDPOINT_XFER_BULK) {
1103                         dev_vdbg(hsotg->dev, "control/bulk\n");
1104                         nptxsts = dwc2_readl(hsotg->regs + GNPTXSTS);
1105                         if ((nptxsts & TXSTS_QSPCAVAIL_MASK) == 0) {
1106                                 dev_vdbg(hsotg->dev, "Disabling channel\n");
1107                                 hcchar &= ~HCCHAR_CHENA;
1108                         }
1109                 } else {
1110                         if (dbg_perio())
1111                                 dev_vdbg(hsotg->dev, "isoc/intr\n");
1112                         hptxsts = dwc2_readl(hsotg->regs + HPTXSTS);
1113                         if ((hptxsts & TXSTS_QSPCAVAIL_MASK) == 0 ||
1114                             hsotg->queuing_high_bandwidth) {
1115                                 if (dbg_perio())
1116                                         dev_vdbg(hsotg->dev, "Disabling channel\n");
1117                                 hcchar &= ~HCCHAR_CHENA;
1118                         }
1119                 }
1120         } else {
1121                 if (dbg_hc(chan))
1122                         dev_vdbg(hsotg->dev, "DMA enabled\n");
1123         }
1124
1125         dwc2_writel(hcchar, hsotg->regs + HCCHAR(chan->hc_num));
1126         chan->halt_status = halt_status;
1127
1128         if (hcchar & HCCHAR_CHENA) {
1129                 if (dbg_hc(chan))
1130                         dev_vdbg(hsotg->dev, "Channel enabled\n");
1131                 chan->halt_pending = 1;
1132                 chan->halt_on_queue = 0;
1133         } else {
1134                 if (dbg_hc(chan))
1135                         dev_vdbg(hsotg->dev, "Channel disabled\n");
1136                 chan->halt_on_queue = 1;
1137         }
1138
1139         if (dbg_hc(chan)) {
1140                 dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
1141                          chan->hc_num);
1142                 dev_vdbg(hsotg->dev, "   hcchar: 0x%08x\n",
1143                          hcchar);
1144                 dev_vdbg(hsotg->dev, "   halt_pending: %d\n",
1145                          chan->halt_pending);
1146                 dev_vdbg(hsotg->dev, "   halt_on_queue: %d\n",
1147                          chan->halt_on_queue);
1148                 dev_vdbg(hsotg->dev, "   halt_status: %d\n",
1149                          chan->halt_status);
1150         }
1151 }
1152
1153 /**
1154  * dwc2_hc_cleanup() - Clears the transfer state for a host channel
1155  *
1156  * @hsotg: Programming view of DWC_otg controller
1157  * @chan:  Identifies the host channel to clean up
1158  *
1159  * This function is normally called after a transfer is done and the host
1160  * channel is being released
1161  */
1162 void dwc2_hc_cleanup(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
1163 {
1164         u32 hcintmsk;
1165
1166         chan->xfer_started = 0;
1167
1168         list_del_init(&chan->split_order_list_entry);
1169
1170         /*
1171          * Clear channel interrupt enables and any unhandled channel interrupt
1172          * conditions
1173          */
1174         dwc2_writel(0, hsotg->regs + HCINTMSK(chan->hc_num));
1175         hcintmsk = 0xffffffff;
1176         hcintmsk &= ~HCINTMSK_RESERVED14_31;
1177         dwc2_writel(hcintmsk, hsotg->regs + HCINT(chan->hc_num));
1178 }
1179
1180 /**
1181  * dwc2_hc_set_even_odd_frame() - Sets the channel property that indicates in
1182  * which frame a periodic transfer should occur
1183  *
1184  * @hsotg:  Programming view of DWC_otg controller
1185  * @chan:   Identifies the host channel to set up and its properties
1186  * @hcchar: Current value of the HCCHAR register for the specified host channel
1187  *
1188  * This function has no effect on non-periodic transfers
1189  */
1190 static void dwc2_hc_set_even_odd_frame(struct dwc2_hsotg *hsotg,
1191                                        struct dwc2_host_chan *chan, u32 *hcchar)
1192 {
1193         if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
1194             chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
1195                 int host_speed;
1196                 int xfer_ns;
1197                 int xfer_us;
1198                 int bytes_in_fifo;
1199                 u16 fifo_space;
1200                 u16 frame_number;
1201                 u16 wire_frame;
1202
1203                 /*
1204                  * Try to figure out if we're an even or odd frame. If we set
1205                  * even and the current frame number is even the the transfer
1206                  * will happen immediately.  Similar if both are odd. If one is
1207                  * even and the other is odd then the transfer will happen when
1208                  * the frame number ticks.
1209                  *
1210                  * There's a bit of a balancing act to get this right.
1211                  * Sometimes we may want to send data in the current frame (AK
1212                  * right away).  We might want to do this if the frame number
1213                  * _just_ ticked, but we might also want to do this in order
1214                  * to continue a split transaction that happened late in a
1215                  * microframe (so we didn't know to queue the next transfer
1216                  * until the frame number had ticked).  The problem is that we
1217                  * need a lot of knowledge to know if there's actually still
1218                  * time to send things or if it would be better to wait until
1219                  * the next frame.
1220                  *
1221                  * We can look at how much time is left in the current frame
1222                  * and make a guess about whether we'll have time to transfer.
1223                  * We'll do that.
1224                  */
1225
1226                 /* Get speed host is running at */
1227                 host_speed = (chan->speed != USB_SPEED_HIGH &&
1228                               !chan->do_split) ? chan->speed : USB_SPEED_HIGH;
1229
1230                 /* See how many bytes are in the periodic FIFO right now */
1231                 fifo_space = (dwc2_readl(hsotg->regs + HPTXSTS) &
1232                               TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT;
1233                 bytes_in_fifo = sizeof(u32) *
1234                                 (hsotg->params.host_perio_tx_fifo_size -
1235                                  fifo_space);
1236
1237                 /*
1238                  * Roughly estimate bus time for everything in the periodic
1239                  * queue + our new transfer.  This is "rough" because we're
1240                  * using a function that makes takes into account IN/OUT
1241                  * and INT/ISO and we're just slamming in one value for all
1242                  * transfers.  This should be an over-estimate and that should
1243                  * be OK, but we can probably tighten it.
1244                  */
1245                 xfer_ns = usb_calc_bus_time(host_speed, false, false,
1246                                             chan->xfer_len + bytes_in_fifo);
1247                 xfer_us = NS_TO_US(xfer_ns);
1248
1249                 /* See what frame number we'll be at by the time we finish */
1250                 frame_number = dwc2_hcd_get_future_frame_number(hsotg, xfer_us);
1251
1252                 /* This is when we were scheduled to be on the wire */
1253                 wire_frame = dwc2_frame_num_inc(chan->qh->next_active_frame, 1);
1254
1255                 /*
1256                  * If we'd finish _after_ the frame we're scheduled in then
1257                  * it's hopeless.  Just schedule right away and hope for the
1258                  * best.  Note that it _might_ be wise to call back into the
1259                  * scheduler to pick a better frame, but this is better than
1260                  * nothing.
1261                  */
1262                 if (dwc2_frame_num_gt(frame_number, wire_frame)) {
1263                         dwc2_sch_vdbg(hsotg,
1264                                       "QH=%p EO MISS fr=%04x=>%04x (%+d)\n",
1265                                       chan->qh, wire_frame, frame_number,
1266                                       dwc2_frame_num_dec(frame_number,
1267                                                          wire_frame));
1268                         wire_frame = frame_number;
1269
1270                         /*
1271                          * We picked a different frame number; communicate this
1272                          * back to the scheduler so it doesn't try to schedule
1273                          * another in the same frame.
1274                          *
1275                          * Remember that next_active_frame is 1 before the wire
1276                          * frame.
1277                          */
1278                         chan->qh->next_active_frame =
1279                                 dwc2_frame_num_dec(frame_number, 1);
1280                 }
1281
1282                 if (wire_frame & 1)
1283                         *hcchar |= HCCHAR_ODDFRM;
1284                 else
1285                         *hcchar &= ~HCCHAR_ODDFRM;
1286         }
1287 }
1288
1289 static void dwc2_set_pid_isoc(struct dwc2_host_chan *chan)
1290 {
1291         /* Set up the initial PID for the transfer */
1292         if (chan->speed == USB_SPEED_HIGH) {
1293                 if (chan->ep_is_in) {
1294                         if (chan->multi_count == 1)
1295                                 chan->data_pid_start = DWC2_HC_PID_DATA0;
1296                         else if (chan->multi_count == 2)
1297                                 chan->data_pid_start = DWC2_HC_PID_DATA1;
1298                         else
1299                                 chan->data_pid_start = DWC2_HC_PID_DATA2;
1300                 } else {
1301                         if (chan->multi_count == 1)
1302                                 chan->data_pid_start = DWC2_HC_PID_DATA0;
1303                         else
1304                                 chan->data_pid_start = DWC2_HC_PID_MDATA;
1305                 }
1306         } else {
1307                 chan->data_pid_start = DWC2_HC_PID_DATA0;
1308         }
1309 }
1310
1311 /**
1312  * dwc2_hc_write_packet() - Writes a packet into the Tx FIFO associated with
1313  * the Host Channel
1314  *
1315  * @hsotg: Programming view of DWC_otg controller
1316  * @chan:  Information needed to initialize the host channel
1317  *
1318  * This function should only be called in Slave mode. For a channel associated
1319  * with a non-periodic EP, the non-periodic Tx FIFO is written. For a channel
1320  * associated with a periodic EP, the periodic Tx FIFO is written.
1321  *
1322  * Upon return the xfer_buf and xfer_count fields in chan are incremented by
1323  * the number of bytes written to the Tx FIFO.
1324  */
1325 static void dwc2_hc_write_packet(struct dwc2_hsotg *hsotg,
1326                                  struct dwc2_host_chan *chan)
1327 {
1328         u32 i;
1329         u32 remaining_count;
1330         u32 byte_count;
1331         u32 dword_count;
1332         u32 __iomem *data_fifo;
1333         u32 *data_buf = (u32 *)chan->xfer_buf;
1334
1335         if (dbg_hc(chan))
1336                 dev_vdbg(hsotg->dev, "%s()\n", __func__);
1337
1338         data_fifo = (u32 __iomem *)(hsotg->regs + HCFIFO(chan->hc_num));
1339
1340         remaining_count = chan->xfer_len - chan->xfer_count;
1341         if (remaining_count > chan->max_packet)
1342                 byte_count = chan->max_packet;
1343         else
1344                 byte_count = remaining_count;
1345
1346         dword_count = (byte_count + 3) / 4;
1347
1348         if (((unsigned long)data_buf & 0x3) == 0) {
1349                 /* xfer_buf is DWORD aligned */
1350                 for (i = 0; i < dword_count; i++, data_buf++)
1351                         dwc2_writel(*data_buf, data_fifo);
1352         } else {
1353                 /* xfer_buf is not DWORD aligned */
1354                 for (i = 0; i < dword_count; i++, data_buf++) {
1355                         u32 data = data_buf[0] | data_buf[1] << 8 |
1356                                    data_buf[2] << 16 | data_buf[3] << 24;
1357                         dwc2_writel(data, data_fifo);
1358                 }
1359         }
1360
1361         chan->xfer_count += byte_count;
1362         chan->xfer_buf += byte_count;
1363 }
1364
1365 /**
1366  * dwc2_hc_do_ping() - Starts a PING transfer
1367  *
1368  * @hsotg: Programming view of DWC_otg controller
1369  * @chan:  Information needed to initialize the host channel
1370  *
1371  * This function should only be called in Slave mode. The Do Ping bit is set in
1372  * the HCTSIZ register, then the channel is enabled.
1373  */
1374 static void dwc2_hc_do_ping(struct dwc2_hsotg *hsotg,
1375                             struct dwc2_host_chan *chan)
1376 {
1377         u32 hcchar;
1378         u32 hctsiz;
1379
1380         if (dbg_hc(chan))
1381                 dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
1382                          chan->hc_num);
1383
1384         hctsiz = TSIZ_DOPNG;
1385         hctsiz |= 1 << TSIZ_PKTCNT_SHIFT;
1386         dwc2_writel(hctsiz, hsotg->regs + HCTSIZ(chan->hc_num));
1387
1388         hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
1389         hcchar |= HCCHAR_CHENA;
1390         hcchar &= ~HCCHAR_CHDIS;
1391         dwc2_writel(hcchar, hsotg->regs + HCCHAR(chan->hc_num));
1392 }
1393
1394 /**
1395  * dwc2_hc_start_transfer() - Does the setup for a data transfer for a host
1396  * channel and starts the transfer
1397  *
1398  * @hsotg: Programming view of DWC_otg controller
1399  * @chan:  Information needed to initialize the host channel. The xfer_len value
1400  *         may be reduced to accommodate the max widths of the XferSize and
1401  *         PktCnt fields in the HCTSIZn register. The multi_count value may be
1402  *         changed to reflect the final xfer_len value.
1403  *
1404  * This function may be called in either Slave mode or DMA mode. In Slave mode,
1405  * the caller must ensure that there is sufficient space in the request queue
1406  * and Tx Data FIFO.
1407  *
1408  * For an OUT transfer in Slave mode, it loads a data packet into the
1409  * appropriate FIFO. If necessary, additional data packets are loaded in the
1410  * Host ISR.
1411  *
1412  * For an IN transfer in Slave mode, a data packet is requested. The data
1413  * packets are unloaded from the Rx FIFO in the Host ISR. If necessary,
1414  * additional data packets are requested in the Host ISR.
1415  *
1416  * For a PING transfer in Slave mode, the Do Ping bit is set in the HCTSIZ
1417  * register along with a packet count of 1 and the channel is enabled. This
1418  * causes a single PING transaction to occur. Other fields in HCTSIZ are
1419  * simply set to 0 since no data transfer occurs in this case.
1420  *
1421  * For a PING transfer in DMA mode, the HCTSIZ register is initialized with
1422  * all the information required to perform the subsequent data transfer. In
1423  * addition, the Do Ping bit is set in the HCTSIZ register. In this case, the
1424  * controller performs the entire PING protocol, then starts the data
1425  * transfer.
1426  */
1427 static void dwc2_hc_start_transfer(struct dwc2_hsotg *hsotg,
1428                                    struct dwc2_host_chan *chan)
1429 {
1430         u32 max_hc_xfer_size = hsotg->params.max_transfer_size;
1431         u16 max_hc_pkt_count = hsotg->params.max_packet_count;
1432         u32 hcchar;
1433         u32 hctsiz = 0;
1434         u16 num_packets;
1435         u32 ec_mc;
1436
1437         if (dbg_hc(chan))
1438                 dev_vdbg(hsotg->dev, "%s()\n", __func__);
1439
1440         if (chan->do_ping) {
1441                 if (!hsotg->params.host_dma) {
1442                         if (dbg_hc(chan))
1443                                 dev_vdbg(hsotg->dev, "ping, no DMA\n");
1444                         dwc2_hc_do_ping(hsotg, chan);
1445                         chan->xfer_started = 1;
1446                         return;
1447                 }
1448
1449                 if (dbg_hc(chan))
1450                         dev_vdbg(hsotg->dev, "ping, DMA\n");
1451
1452                 hctsiz |= TSIZ_DOPNG;
1453         }
1454
1455         if (chan->do_split) {
1456                 if (dbg_hc(chan))
1457                         dev_vdbg(hsotg->dev, "split\n");
1458                 num_packets = 1;
1459
1460                 if (chan->complete_split && !chan->ep_is_in)
1461                         /*
1462                          * For CSPLIT OUT Transfer, set the size to 0 so the
1463                          * core doesn't expect any data written to the FIFO
1464                          */
1465                         chan->xfer_len = 0;
1466                 else if (chan->ep_is_in || chan->xfer_len > chan->max_packet)
1467                         chan->xfer_len = chan->max_packet;
1468                 else if (!chan->ep_is_in && chan->xfer_len > 188)
1469                         chan->xfer_len = 188;
1470
1471                 hctsiz |= chan->xfer_len << TSIZ_XFERSIZE_SHIFT &
1472                           TSIZ_XFERSIZE_MASK;
1473
1474                 /* For split set ec_mc for immediate retries */
1475                 if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
1476                     chan->ep_type == USB_ENDPOINT_XFER_ISOC)
1477                         ec_mc = 3;
1478                 else
1479                         ec_mc = 1;
1480         } else {
1481                 if (dbg_hc(chan))
1482                         dev_vdbg(hsotg->dev, "no split\n");
1483                 /*
1484                  * Ensure that the transfer length and packet count will fit
1485                  * in the widths allocated for them in the HCTSIZn register
1486                  */
1487                 if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
1488                     chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
1489                         /*
1490                          * Make sure the transfer size is no larger than one
1491                          * (micro)frame's worth of data. (A check was done
1492                          * when the periodic transfer was accepted to ensure
1493                          * that a (micro)frame's worth of data can be
1494                          * programmed into a channel.)
1495                          */
1496                         u32 max_periodic_len =
1497                                 chan->multi_count * chan->max_packet;
1498
1499                         if (chan->xfer_len > max_periodic_len)
1500                                 chan->xfer_len = max_periodic_len;
1501                 } else if (chan->xfer_len > max_hc_xfer_size) {
1502                         /*
1503                          * Make sure that xfer_len is a multiple of max packet
1504                          * size
1505                          */
1506                         chan->xfer_len =
1507                                 max_hc_xfer_size - chan->max_packet + 1;
1508                 }
1509
1510                 if (chan->xfer_len > 0) {
1511                         num_packets = (chan->xfer_len + chan->max_packet - 1) /
1512                                         chan->max_packet;
1513                         if (num_packets > max_hc_pkt_count) {
1514                                 num_packets = max_hc_pkt_count;
1515                                 chan->xfer_len = num_packets * chan->max_packet;
1516                         }
1517                 } else {
1518                         /* Need 1 packet for transfer length of 0 */
1519                         num_packets = 1;
1520                 }
1521
1522                 if (chan->ep_is_in)
1523                         /*
1524                          * Always program an integral # of max packets for IN
1525                          * transfers
1526                          */
1527                         chan->xfer_len = num_packets * chan->max_packet;
1528
1529                 if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
1530                     chan->ep_type == USB_ENDPOINT_XFER_ISOC)
1531                         /*
1532                          * Make sure that the multi_count field matches the
1533                          * actual transfer length
1534                          */
1535                         chan->multi_count = num_packets;
1536
1537                 if (chan->ep_type == USB_ENDPOINT_XFER_ISOC)
1538                         dwc2_set_pid_isoc(chan);
1539
1540                 hctsiz |= chan->xfer_len << TSIZ_XFERSIZE_SHIFT &
1541                           TSIZ_XFERSIZE_MASK;
1542
1543                 /* The ec_mc gets the multi_count for non-split */
1544                 ec_mc = chan->multi_count;
1545         }
1546
1547         chan->start_pkt_count = num_packets;
1548         hctsiz |= num_packets << TSIZ_PKTCNT_SHIFT & TSIZ_PKTCNT_MASK;
1549         hctsiz |= chan->data_pid_start << TSIZ_SC_MC_PID_SHIFT &
1550                   TSIZ_SC_MC_PID_MASK;
1551         dwc2_writel(hctsiz, hsotg->regs + HCTSIZ(chan->hc_num));
1552         if (dbg_hc(chan)) {
1553                 dev_vdbg(hsotg->dev, "Wrote %08x to HCTSIZ(%d)\n",
1554                          hctsiz, chan->hc_num);
1555
1556                 dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
1557                          chan->hc_num);
1558                 dev_vdbg(hsotg->dev, "   Xfer Size: %d\n",
1559                          (hctsiz & TSIZ_XFERSIZE_MASK) >>
1560                          TSIZ_XFERSIZE_SHIFT);
1561                 dev_vdbg(hsotg->dev, "   Num Pkts: %d\n",
1562                          (hctsiz & TSIZ_PKTCNT_MASK) >>
1563                          TSIZ_PKTCNT_SHIFT);
1564                 dev_vdbg(hsotg->dev, "   Start PID: %d\n",
1565                          (hctsiz & TSIZ_SC_MC_PID_MASK) >>
1566                          TSIZ_SC_MC_PID_SHIFT);
1567         }
1568
1569         if (hsotg->params.host_dma) {
1570                 dma_addr_t dma_addr;
1571
1572                 if (chan->align_buf) {
1573                         if (dbg_hc(chan))
1574                                 dev_vdbg(hsotg->dev, "align_buf\n");
1575                         dma_addr = chan->align_buf;
1576                 } else {
1577                         dma_addr = chan->xfer_dma;
1578                 }
1579                 dwc2_writel((u32)dma_addr, hsotg->regs + HCDMA(chan->hc_num));
1580
1581                 if (dbg_hc(chan))
1582                         dev_vdbg(hsotg->dev, "Wrote %08lx to HCDMA(%d)\n",
1583                                  (unsigned long)dma_addr, chan->hc_num);
1584         }
1585
1586         /* Start the split */
1587         if (chan->do_split) {
1588                 u32 hcsplt = dwc2_readl(hsotg->regs + HCSPLT(chan->hc_num));
1589
1590                 hcsplt |= HCSPLT_SPLTENA;
1591                 dwc2_writel(hcsplt, hsotg->regs + HCSPLT(chan->hc_num));
1592         }
1593
1594         hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
1595         hcchar &= ~HCCHAR_MULTICNT_MASK;
1596         hcchar |= (ec_mc << HCCHAR_MULTICNT_SHIFT) & HCCHAR_MULTICNT_MASK;
1597         dwc2_hc_set_even_odd_frame(hsotg, chan, &hcchar);
1598
1599         if (hcchar & HCCHAR_CHDIS)
1600                 dev_warn(hsotg->dev,
1601                          "%s: chdis set, channel %d, hcchar 0x%08x\n",
1602                          __func__, chan->hc_num, hcchar);
1603
1604         /* Set host channel enable after all other setup is complete */
1605         hcchar |= HCCHAR_CHENA;
1606         hcchar &= ~HCCHAR_CHDIS;
1607
1608         if (dbg_hc(chan))
1609                 dev_vdbg(hsotg->dev, "   Multi Cnt: %d\n",
1610                          (hcchar & HCCHAR_MULTICNT_MASK) >>
1611                          HCCHAR_MULTICNT_SHIFT);
1612
1613         dwc2_writel(hcchar, hsotg->regs + HCCHAR(chan->hc_num));
1614         if (dbg_hc(chan))
1615                 dev_vdbg(hsotg->dev, "Wrote %08x to HCCHAR(%d)\n", hcchar,
1616                          chan->hc_num);
1617
1618         chan->xfer_started = 1;
1619         chan->requests++;
1620
1621         if (!hsotg->params.host_dma &&
1622             !chan->ep_is_in && chan->xfer_len > 0)
1623                 /* Load OUT packet into the appropriate Tx FIFO */
1624                 dwc2_hc_write_packet(hsotg, chan);
1625 }
1626
1627 /**
1628  * dwc2_hc_start_transfer_ddma() - Does the setup for a data transfer for a
1629  * host channel and starts the transfer in Descriptor DMA mode
1630  *
1631  * @hsotg: Programming view of DWC_otg controller
1632  * @chan:  Information needed to initialize the host channel
1633  *
1634  * Initializes HCTSIZ register. For a PING transfer the Do Ping bit is set.
1635  * Sets PID and NTD values. For periodic transfers initializes SCHED_INFO field
1636  * with micro-frame bitmap.
1637  *
1638  * Initializes HCDMA register with descriptor list address and CTD value then
1639  * starts the transfer via enabling the channel.
1640  */
1641 void dwc2_hc_start_transfer_ddma(struct dwc2_hsotg *hsotg,
1642                                  struct dwc2_host_chan *chan)
1643 {
1644         u32 hcchar;
1645         u32 hctsiz = 0;
1646
1647         if (chan->do_ping)
1648                 hctsiz |= TSIZ_DOPNG;
1649
1650         if (chan->ep_type == USB_ENDPOINT_XFER_ISOC)
1651                 dwc2_set_pid_isoc(chan);
1652
1653         /* Packet Count and Xfer Size are not used in Descriptor DMA mode */
1654         hctsiz |= chan->data_pid_start << TSIZ_SC_MC_PID_SHIFT &
1655                   TSIZ_SC_MC_PID_MASK;
1656
1657         /* 0 - 1 descriptor, 1 - 2 descriptors, etc */
1658         hctsiz |= (chan->ntd - 1) << TSIZ_NTD_SHIFT & TSIZ_NTD_MASK;
1659
1660         /* Non-zero only for high-speed interrupt endpoints */
1661         hctsiz |= chan->schinfo << TSIZ_SCHINFO_SHIFT & TSIZ_SCHINFO_MASK;
1662
1663         if (dbg_hc(chan)) {
1664                 dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
1665                          chan->hc_num);
1666                 dev_vdbg(hsotg->dev, "   Start PID: %d\n",
1667                          chan->data_pid_start);
1668                 dev_vdbg(hsotg->dev, "   NTD: %d\n", chan->ntd - 1);
1669         }
1670
1671         dwc2_writel(hctsiz, hsotg->regs + HCTSIZ(chan->hc_num));
1672
1673         dma_sync_single_for_device(hsotg->dev, chan->desc_list_addr,
1674                                    chan->desc_list_sz, DMA_TO_DEVICE);
1675
1676         dwc2_writel(chan->desc_list_addr, hsotg->regs + HCDMA(chan->hc_num));
1677
1678         if (dbg_hc(chan))
1679                 dev_vdbg(hsotg->dev, "Wrote %pad to HCDMA(%d)\n",
1680                          &chan->desc_list_addr, chan->hc_num);
1681
1682         hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
1683         hcchar &= ~HCCHAR_MULTICNT_MASK;
1684         hcchar |= chan->multi_count << HCCHAR_MULTICNT_SHIFT &
1685                   HCCHAR_MULTICNT_MASK;
1686
1687         if (hcchar & HCCHAR_CHDIS)
1688                 dev_warn(hsotg->dev,
1689                          "%s: chdis set, channel %d, hcchar 0x%08x\n",
1690                          __func__, chan->hc_num, hcchar);
1691
1692         /* Set host channel enable after all other setup is complete */
1693         hcchar |= HCCHAR_CHENA;
1694         hcchar &= ~HCCHAR_CHDIS;
1695
1696         if (dbg_hc(chan))
1697                 dev_vdbg(hsotg->dev, "   Multi Cnt: %d\n",
1698                          (hcchar & HCCHAR_MULTICNT_MASK) >>
1699                          HCCHAR_MULTICNT_SHIFT);
1700
1701         dwc2_writel(hcchar, hsotg->regs + HCCHAR(chan->hc_num));
1702         if (dbg_hc(chan))
1703                 dev_vdbg(hsotg->dev, "Wrote %08x to HCCHAR(%d)\n", hcchar,
1704                          chan->hc_num);
1705
1706         chan->xfer_started = 1;
1707         chan->requests++;
1708 }
1709
1710 /**
1711  * dwc2_hc_continue_transfer() - Continues a data transfer that was started by
1712  * a previous call to dwc2_hc_start_transfer()
1713  *
1714  * @hsotg: Programming view of DWC_otg controller
1715  * @chan:  Information needed to initialize the host channel
1716  *
1717  * The caller must ensure there is sufficient space in the request queue and Tx
1718  * Data FIFO. This function should only be called in Slave mode. In DMA mode,
1719  * the controller acts autonomously to complete transfers programmed to a host
1720  * channel.
1721  *
1722  * For an OUT transfer, a new data packet is loaded into the appropriate FIFO
1723  * if there is any data remaining to be queued. For an IN transfer, another
1724  * data packet is always requested. For the SETUP phase of a control transfer,
1725  * this function does nothing.
1726  *
1727  * Return: 1 if a new request is queued, 0 if no more requests are required
1728  * for this transfer
1729  */
1730 static int dwc2_hc_continue_transfer(struct dwc2_hsotg *hsotg,
1731                                      struct dwc2_host_chan *chan)
1732 {
1733         if (dbg_hc(chan))
1734                 dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
1735                          chan->hc_num);
1736
1737         if (chan->do_split)
1738                 /* SPLITs always queue just once per channel */
1739                 return 0;
1740
1741         if (chan->data_pid_start == DWC2_HC_PID_SETUP)
1742                 /* SETUPs are queued only once since they can't be NAK'd */
1743                 return 0;
1744
1745         if (chan->ep_is_in) {
1746                 /*
1747                  * Always queue another request for other IN transfers. If
1748                  * back-to-back INs are issued and NAKs are received for both,
1749                  * the driver may still be processing the first NAK when the
1750                  * second NAK is received. When the interrupt handler clears
1751                  * the NAK interrupt for the first NAK, the second NAK will
1752                  * not be seen. So we can't depend on the NAK interrupt
1753                  * handler to requeue a NAK'd request. Instead, IN requests
1754                  * are issued each time this function is called. When the
1755                  * transfer completes, the extra requests for the channel will
1756                  * be flushed.
1757                  */
1758                 u32 hcchar = dwc2_readl(hsotg->regs + HCCHAR(chan->hc_num));
1759
1760                 dwc2_hc_set_even_odd_frame(hsotg, chan, &hcchar);
1761                 hcchar |= HCCHAR_CHENA;
1762                 hcchar &= ~HCCHAR_CHDIS;
1763                 if (dbg_hc(chan))
1764                         dev_vdbg(hsotg->dev, "   IN xfer: hcchar = 0x%08x\n",
1765                                  hcchar);
1766                 dwc2_writel(hcchar, hsotg->regs + HCCHAR(chan->hc_num));
1767                 chan->requests++;
1768                 return 1;
1769         }
1770
1771         /* OUT transfers */
1772
1773         if (chan->xfer_count < chan->xfer_len) {
1774                 if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
1775                     chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
1776                         u32 hcchar = dwc2_readl(hsotg->regs +
1777                                                 HCCHAR(chan->hc_num));
1778
1779                         dwc2_hc_set_even_odd_frame(hsotg, chan,
1780                                                    &hcchar);
1781                 }
1782
1783                 /* Load OUT packet into the appropriate Tx FIFO */
1784                 dwc2_hc_write_packet(hsotg, chan);
1785                 chan->requests++;
1786                 return 1;
1787         }
1788
1789         return 0;
1790 }
1791
1792 /*
1793  * =========================================================================
1794  *  HCD
1795  * =========================================================================
1796  */
1797
1798 /*
1799  * Processes all the URBs in a single list of QHs. Completes them with
1800  * -ETIMEDOUT and frees the QTD.
1801  *
1802  * Must be called with interrupt disabled and spinlock held
1803  */
1804 static void dwc2_kill_urbs_in_qh_list(struct dwc2_hsotg *hsotg,
1805                                       struct list_head *qh_list)
1806 {
1807         struct dwc2_qh *qh, *qh_tmp;
1808         struct dwc2_qtd *qtd, *qtd_tmp;
1809
1810         list_for_each_entry_safe(qh, qh_tmp, qh_list, qh_list_entry) {
1811                 list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list,
1812                                          qtd_list_entry) {
1813                         dwc2_host_complete(hsotg, qtd, -ECONNRESET);
1814                         dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
1815                 }
1816         }
1817 }
1818
1819 static void dwc2_qh_list_free(struct dwc2_hsotg *hsotg,
1820                               struct list_head *qh_list)
1821 {
1822         struct dwc2_qtd *qtd, *qtd_tmp;
1823         struct dwc2_qh *qh, *qh_tmp;
1824         unsigned long flags;
1825
1826         if (!qh_list->next)
1827                 /* The list hasn't been initialized yet */
1828                 return;
1829
1830         spin_lock_irqsave(&hsotg->lock, flags);
1831
1832         /* Ensure there are no QTDs or URBs left */
1833         dwc2_kill_urbs_in_qh_list(hsotg, qh_list);
1834
1835         list_for_each_entry_safe(qh, qh_tmp, qh_list, qh_list_entry) {
1836                 dwc2_hcd_qh_unlink(hsotg, qh);
1837
1838                 /* Free each QTD in the QH's QTD list */
1839                 list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list,
1840                                          qtd_list_entry)
1841                         dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
1842
1843                 if (qh->channel && qh->channel->qh == qh)
1844                         qh->channel->qh = NULL;
1845
1846                 spin_unlock_irqrestore(&hsotg->lock, flags);
1847                 dwc2_hcd_qh_free(hsotg, qh);
1848                 spin_lock_irqsave(&hsotg->lock, flags);
1849         }
1850
1851         spin_unlock_irqrestore(&hsotg->lock, flags);
1852 }
1853
1854 /*
1855  * Responds with an error status of -ETIMEDOUT to all URBs in the non-periodic
1856  * and periodic schedules. The QTD associated with each URB is removed from
1857  * the schedule and freed. This function may be called when a disconnect is
1858  * detected or when the HCD is being stopped.
1859  *
1860  * Must be called with interrupt disabled and spinlock held
1861  */
1862 static void dwc2_kill_all_urbs(struct dwc2_hsotg *hsotg)
1863 {
1864         dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_inactive);
1865         dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_waiting);
1866         dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_active);
1867         dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_inactive);
1868         dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_ready);
1869         dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_assigned);
1870         dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_queued);
1871 }
1872
1873 /**
1874  * dwc2_hcd_start() - Starts the HCD when switching to Host mode
1875  *
1876  * @hsotg: Pointer to struct dwc2_hsotg
1877  */
1878 void dwc2_hcd_start(struct dwc2_hsotg *hsotg)
1879 {
1880         u32 hprt0;
1881
1882         if (hsotg->op_state == OTG_STATE_B_HOST) {
1883                 /*
1884                  * Reset the port. During a HNP mode switch the reset
1885                  * needs to occur within 1ms and have a duration of at
1886                  * least 50ms.
1887                  */
1888                 hprt0 = dwc2_read_hprt0(hsotg);
1889                 hprt0 |= HPRT0_RST;
1890                 dwc2_writel(hprt0, hsotg->regs + HPRT0);
1891         }
1892
1893         queue_delayed_work(hsotg->wq_otg, &hsotg->start_work,
1894                            msecs_to_jiffies(50));
1895 }
1896
1897 /* Must be called with interrupt disabled and spinlock held */
1898 static void dwc2_hcd_cleanup_channels(struct dwc2_hsotg *hsotg)
1899 {
1900         int num_channels = hsotg->params.host_channels;
1901         struct dwc2_host_chan *channel;
1902         u32 hcchar;
1903         int i;
1904
1905         if (!hsotg->params.host_dma) {
1906                 /* Flush out any channel requests in slave mode */
1907                 for (i = 0; i < num_channels; i++) {
1908                         channel = hsotg->hc_ptr_array[i];
1909                         if (!list_empty(&channel->hc_list_entry))
1910                                 continue;
1911                         hcchar = dwc2_readl(hsotg->regs + HCCHAR(i));
1912                         if (hcchar & HCCHAR_CHENA) {
1913                                 hcchar &= ~(HCCHAR_CHENA | HCCHAR_EPDIR);
1914                                 hcchar |= HCCHAR_CHDIS;
1915                                 dwc2_writel(hcchar, hsotg->regs + HCCHAR(i));
1916                         }
1917                 }
1918         }
1919
1920         for (i = 0; i < num_channels; i++) {
1921                 channel = hsotg->hc_ptr_array[i];
1922                 if (!list_empty(&channel->hc_list_entry))
1923                         continue;
1924                 hcchar = dwc2_readl(hsotg->regs + HCCHAR(i));
1925                 if (hcchar & HCCHAR_CHENA) {
1926                         /* Halt the channel */
1927                         hcchar |= HCCHAR_CHDIS;
1928                         dwc2_writel(hcchar, hsotg->regs + HCCHAR(i));
1929                 }
1930
1931                 dwc2_hc_cleanup(hsotg, channel);
1932                 list_add_tail(&channel->hc_list_entry, &hsotg->free_hc_list);
1933                 /*
1934                  * Added for Descriptor DMA to prevent channel double cleanup in
1935                  * release_channel_ddma(), which is called from ep_disable when
1936                  * device disconnects
1937                  */
1938                 channel->qh = NULL;
1939         }
1940         /* All channels have been freed, mark them available */
1941         if (hsotg->params.uframe_sched) {
1942                 hsotg->available_host_channels =
1943                         hsotg->params.host_channels;
1944         } else {
1945                 hsotg->non_periodic_channels = 0;
1946                 hsotg->periodic_channels = 0;
1947         }
1948 }
1949
1950 /**
1951  * dwc2_hcd_connect() - Handles connect of the HCD
1952  *
1953  * @hsotg: Pointer to struct dwc2_hsotg
1954  *
1955  * Must be called with interrupt disabled and spinlock held
1956  */
1957 void dwc2_hcd_connect(struct dwc2_hsotg *hsotg)
1958 {
1959         if (hsotg->lx_state != DWC2_L0)
1960                 usb_hcd_resume_root_hub(hsotg->priv);
1961
1962         hsotg->flags.b.port_connect_status_change = 1;
1963         hsotg->flags.b.port_connect_status = 1;
1964 }
1965
1966 /**
1967  * dwc2_hcd_disconnect() - Handles disconnect of the HCD
1968  *
1969  * @hsotg: Pointer to struct dwc2_hsotg
1970  * @force: If true, we won't try to reconnect even if we see device connected.
1971  *
1972  * Must be called with interrupt disabled and spinlock held
1973  */
1974 void dwc2_hcd_disconnect(struct dwc2_hsotg *hsotg, bool force)
1975 {
1976         u32 intr;
1977         u32 hprt0;
1978
1979         /* Set status flags for the hub driver */
1980         hsotg->flags.b.port_connect_status_change = 1;
1981         hsotg->flags.b.port_connect_status = 0;
1982
1983         /*
1984          * Shutdown any transfers in process by clearing the Tx FIFO Empty
1985          * interrupt mask and status bits and disabling subsequent host
1986          * channel interrupts.
1987          */
1988         intr = dwc2_readl(hsotg->regs + GINTMSK);
1989         intr &= ~(GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT);
1990         dwc2_writel(intr, hsotg->regs + GINTMSK);
1991         intr = GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT;
1992         dwc2_writel(intr, hsotg->regs + GINTSTS);
1993
1994         /*
1995          * Turn off the vbus power only if the core has transitioned to device
1996          * mode. If still in host mode, need to keep power on to detect a
1997          * reconnection.
1998          */
1999         if (dwc2_is_device_mode(hsotg)) {
2000                 if (hsotg->op_state != OTG_STATE_A_SUSPEND) {
2001                         dev_dbg(hsotg->dev, "Disconnect: PortPower off\n");
2002                         dwc2_writel(0, hsotg->regs + HPRT0);
2003                 }
2004
2005                 dwc2_disable_host_interrupts(hsotg);
2006         }
2007
2008         /* Respond with an error status to all URBs in the schedule */
2009         dwc2_kill_all_urbs(hsotg);
2010
2011         if (dwc2_is_host_mode(hsotg))
2012                 /* Clean up any host channels that were in use */
2013                 dwc2_hcd_cleanup_channels(hsotg);
2014
2015         dwc2_host_disconnect(hsotg);
2016
2017         /*
2018          * Add an extra check here to see if we're actually connected but
2019          * we don't have a detection interrupt pending.  This can happen if:
2020          *   1. hardware sees connect
2021          *   2. hardware sees disconnect
2022          *   3. hardware sees connect
2023          *   4. dwc2_port_intr() - clears connect interrupt
2024          *   5. dwc2_handle_common_intr() - calls here
2025          *
2026          * Without the extra check here we will end calling disconnect
2027          * and won't get any future interrupts to handle the connect.
2028          */
2029         if (!force) {
2030                 hprt0 = dwc2_readl(hsotg->regs + HPRT0);
2031                 if (!(hprt0 & HPRT0_CONNDET) && (hprt0 & HPRT0_CONNSTS))
2032                         dwc2_hcd_connect(hsotg);
2033         }
2034 }
2035
2036 /**
2037  * dwc2_hcd_rem_wakeup() - Handles Remote Wakeup
2038  *
2039  * @hsotg: Pointer to struct dwc2_hsotg
2040  */
2041 static void dwc2_hcd_rem_wakeup(struct dwc2_hsotg *hsotg)
2042 {
2043         if (hsotg->bus_suspended) {
2044                 hsotg->flags.b.port_suspend_change = 1;
2045                 usb_hcd_resume_root_hub(hsotg->priv);
2046         }
2047
2048         if (hsotg->lx_state == DWC2_L1)
2049                 hsotg->flags.b.port_l1_change = 1;
2050 }
2051
2052 /**
2053  * dwc2_hcd_stop() - Halts the DWC_otg host mode operations in a clean manner
2054  *
2055  * @hsotg: Pointer to struct dwc2_hsotg
2056  *
2057  * Must be called with interrupt disabled and spinlock held
2058  */
2059 void dwc2_hcd_stop(struct dwc2_hsotg *hsotg)
2060 {
2061         dev_dbg(hsotg->dev, "DWC OTG HCD STOP\n");
2062
2063         /*
2064          * The root hub should be disconnected before this function is called.
2065          * The disconnect will clear the QTD lists (via ..._hcd_urb_dequeue)
2066          * and the QH lists (via ..._hcd_endpoint_disable).
2067          */
2068
2069         /* Turn off all host-specific interrupts */
2070         dwc2_disable_host_interrupts(hsotg);
2071
2072         /* Turn off the vbus power */
2073         dev_dbg(hsotg->dev, "PortPower off\n");
2074         dwc2_writel(0, hsotg->regs + HPRT0);
2075 }
2076
2077 /* Caller must hold driver lock */
2078 static int dwc2_hcd_urb_enqueue(struct dwc2_hsotg *hsotg,
2079                                 struct dwc2_hcd_urb *urb, struct dwc2_qh *qh,
2080                                 struct dwc2_qtd *qtd)
2081 {
2082         u32 intr_mask;
2083         int retval;
2084         int dev_speed;
2085
2086         if (!hsotg->flags.b.port_connect_status) {
2087                 /* No longer connected */
2088                 dev_err(hsotg->dev, "Not connected\n");
2089                 return -ENODEV;
2090         }
2091
2092         dev_speed = dwc2_host_get_speed(hsotg, urb->priv);
2093
2094         /* Some configurations cannot support LS traffic on a FS root port */
2095         if ((dev_speed == USB_SPEED_LOW) &&
2096             (hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED) &&
2097             (hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_UTMI)) {
2098                 u32 hprt0 = dwc2_readl(hsotg->regs + HPRT0);
2099                 u32 prtspd = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT;
2100
2101                 if (prtspd == HPRT0_SPD_FULL_SPEED)
2102                         return -ENODEV;
2103         }
2104
2105         if (!qtd)
2106                 return -EINVAL;
2107
2108         dwc2_hcd_qtd_init(qtd, urb);
2109         retval = dwc2_hcd_qtd_add(hsotg, qtd, qh);
2110         if (retval) {
2111                 dev_err(hsotg->dev,
2112                         "DWC OTG HCD URB Enqueue failed adding QTD. Error status %d\n",
2113                         retval);
2114                 return retval;
2115         }
2116
2117         intr_mask = dwc2_readl(hsotg->regs + GINTMSK);
2118         if (!(intr_mask & GINTSTS_SOF)) {
2119                 enum dwc2_transaction_type tr_type;
2120
2121                 if (qtd->qh->ep_type == USB_ENDPOINT_XFER_BULK &&
2122                     !(qtd->urb->flags & URB_GIVEBACK_ASAP))
2123                         /*
2124                          * Do not schedule SG transactions until qtd has
2125                          * URB_GIVEBACK_ASAP set
2126                          */
2127                         return 0;
2128
2129                 tr_type = dwc2_hcd_select_transactions(hsotg);
2130                 if (tr_type != DWC2_TRANSACTION_NONE)
2131                         dwc2_hcd_queue_transactions(hsotg, tr_type);
2132         }
2133
2134         return 0;
2135 }
2136
2137 /* Must be called with interrupt disabled and spinlock held */
2138 static int dwc2_hcd_urb_dequeue(struct dwc2_hsotg *hsotg,
2139                                 struct dwc2_hcd_urb *urb)
2140 {
2141         struct dwc2_qh *qh;
2142         struct dwc2_qtd *urb_qtd;
2143
2144         urb_qtd = urb->qtd;
2145         if (!urb_qtd) {
2146                 dev_dbg(hsotg->dev, "## Urb QTD is NULL ##\n");
2147                 return -EINVAL;
2148         }
2149
2150         qh = urb_qtd->qh;
2151         if (!qh) {
2152                 dev_dbg(hsotg->dev, "## Urb QTD QH is NULL ##\n");
2153                 return -EINVAL;
2154         }
2155
2156         urb->priv = NULL;
2157
2158         if (urb_qtd->in_process && qh->channel) {
2159                 dwc2_dump_channel_info(hsotg, qh->channel);
2160
2161                 /* The QTD is in process (it has been assigned to a channel) */
2162                 if (hsotg->flags.b.port_connect_status)
2163                         /*
2164                          * If still connected (i.e. in host mode), halt the
2165                          * channel so it can be used for other transfers. If
2166                          * no longer connected, the host registers can't be
2167                          * written to halt the channel since the core is in
2168                          * device mode.
2169                          */
2170                         dwc2_hc_halt(hsotg, qh->channel,
2171                                      DWC2_HC_XFER_URB_DEQUEUE);
2172         }
2173
2174         /*
2175          * Free the QTD and clean up the associated QH. Leave the QH in the
2176          * schedule if it has any remaining QTDs.
2177          */
2178         if (!hsotg->params.dma_desc_enable) {
2179                 u8 in_process = urb_qtd->in_process;
2180
2181                 dwc2_hcd_qtd_unlink_and_free(hsotg, urb_qtd, qh);
2182                 if (in_process) {
2183                         dwc2_hcd_qh_deactivate(hsotg, qh, 0);
2184                         qh->channel = NULL;
2185                 } else if (list_empty(&qh->qtd_list)) {
2186                         dwc2_hcd_qh_unlink(hsotg, qh);
2187                 }
2188         } else {
2189                 dwc2_hcd_qtd_unlink_and_free(hsotg, urb_qtd, qh);
2190         }
2191
2192         return 0;
2193 }
2194
2195 /* Must NOT be called with interrupt disabled or spinlock held */
2196 static int dwc2_hcd_endpoint_disable(struct dwc2_hsotg *hsotg,
2197                                      struct usb_host_endpoint *ep, int retry)
2198 {
2199         struct dwc2_qtd *qtd, *qtd_tmp;
2200         struct dwc2_qh *qh;
2201         unsigned long flags;
2202         int rc;
2203
2204         spin_lock_irqsave(&hsotg->lock, flags);
2205
2206         qh = ep->hcpriv;
2207         if (!qh) {
2208                 rc = -EINVAL;
2209                 goto err;
2210         }
2211
2212         while (!list_empty(&qh->qtd_list) && retry--) {
2213                 if (retry == 0) {
2214                         dev_err(hsotg->dev,
2215                                 "## timeout in dwc2_hcd_endpoint_disable() ##\n");
2216                         rc = -EBUSY;
2217                         goto err;
2218                 }
2219
2220                 spin_unlock_irqrestore(&hsotg->lock, flags);
2221                 msleep(20);
2222                 spin_lock_irqsave(&hsotg->lock, flags);
2223                 qh = ep->hcpriv;
2224                 if (!qh) {
2225                         rc = -EINVAL;
2226                         goto err;
2227                 }
2228         }
2229
2230         dwc2_hcd_qh_unlink(hsotg, qh);
2231
2232         /* Free each QTD in the QH's QTD list */
2233         list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list, qtd_list_entry)
2234                 dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
2235
2236         ep->hcpriv = NULL;
2237
2238         if (qh->channel && qh->channel->qh == qh)
2239                 qh->channel->qh = NULL;
2240
2241         spin_unlock_irqrestore(&hsotg->lock, flags);
2242
2243         dwc2_hcd_qh_free(hsotg, qh);
2244
2245         return 0;
2246
2247 err:
2248         ep->hcpriv = NULL;
2249         spin_unlock_irqrestore(&hsotg->lock, flags);
2250
2251         return rc;
2252 }
2253
2254 /* Must be called with interrupt disabled and spinlock held */
2255 static int dwc2_hcd_endpoint_reset(struct dwc2_hsotg *hsotg,
2256                                    struct usb_host_endpoint *ep)
2257 {
2258         struct dwc2_qh *qh = ep->hcpriv;
2259
2260         if (!qh)
2261                 return -EINVAL;
2262
2263         qh->data_toggle = DWC2_HC_PID_DATA0;
2264
2265         return 0;
2266 }
2267
2268 /**
2269  * dwc2_core_init() - Initializes the DWC_otg controller registers and
2270  * prepares the core for device mode or host mode operation
2271  *
2272  * @hsotg:         Programming view of the DWC_otg controller
2273  * @initial_setup: If true then this is the first init for this instance.
2274  */
2275 int dwc2_core_init(struct dwc2_hsotg *hsotg, bool initial_setup)
2276 {
2277         u32 usbcfg, otgctl;
2278         int retval;
2279
2280         dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg);
2281
2282         usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
2283
2284         /* Set ULPI External VBUS bit if needed */
2285         usbcfg &= ~GUSBCFG_ULPI_EXT_VBUS_DRV;
2286         if (hsotg->params.phy_ulpi_ext_vbus)
2287                 usbcfg |= GUSBCFG_ULPI_EXT_VBUS_DRV;
2288
2289         /* Set external TS Dline pulsing bit if needed */
2290         usbcfg &= ~GUSBCFG_TERMSELDLPULSE;
2291         if (hsotg->params.ts_dline)
2292                 usbcfg |= GUSBCFG_TERMSELDLPULSE;
2293
2294         dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
2295
2296         /*
2297          * Reset the Controller
2298          *
2299          * We only need to reset the controller if this is a re-init.
2300          * For the first init we know for sure that earlier code reset us (it
2301          * needed to in order to properly detect various parameters).
2302          */
2303         if (!initial_setup) {
2304                 retval = dwc2_core_reset(hsotg, false);
2305                 if (retval) {
2306                         dev_err(hsotg->dev, "%s(): Reset failed, aborting\n",
2307                                 __func__);
2308                         return retval;
2309                 }
2310         }
2311
2312         /*
2313          * This needs to happen in FS mode before any other programming occurs
2314          */
2315         retval = dwc2_phy_init(hsotg, initial_setup);
2316         if (retval)
2317                 return retval;
2318
2319         /* Program the GAHBCFG Register */
2320         retval = dwc2_gahbcfg_init(hsotg);
2321         if (retval)
2322                 return retval;
2323
2324         /* Program the GUSBCFG register */
2325         dwc2_gusbcfg_init(hsotg);
2326
2327         /* Program the GOTGCTL register */
2328         otgctl = dwc2_readl(hsotg->regs + GOTGCTL);
2329         otgctl &= ~GOTGCTL_OTGVER;
2330         dwc2_writel(otgctl, hsotg->regs + GOTGCTL);
2331
2332         /* Clear the SRP success bit for FS-I2c */
2333         hsotg->srp_success = 0;
2334
2335         /* Enable common interrupts */
2336         dwc2_enable_common_interrupts(hsotg);
2337
2338         /*
2339          * Do device or host initialization based on mode during PCD and
2340          * HCD initialization
2341          */
2342         if (dwc2_is_host_mode(hsotg)) {
2343                 dev_dbg(hsotg->dev, "Host Mode\n");
2344                 hsotg->op_state = OTG_STATE_A_HOST;
2345         } else {
2346                 dev_dbg(hsotg->dev, "Device Mode\n");
2347                 hsotg->op_state = OTG_STATE_B_PERIPHERAL;
2348         }
2349
2350         return 0;
2351 }
2352
2353 /**
2354  * dwc2_core_host_init() - Initializes the DWC_otg controller registers for
2355  * Host mode
2356  *
2357  * @hsotg: Programming view of DWC_otg controller
2358  *
2359  * This function flushes the Tx and Rx FIFOs and flushes any entries in the
2360  * request queues. Host channels are reset to ensure that they are ready for
2361  * performing transfers.
2362  */
2363 static void dwc2_core_host_init(struct dwc2_hsotg *hsotg)
2364 {
2365         u32 hcfg, hfir, otgctl, usbcfg;
2366
2367         dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg);
2368
2369         /* Set HS/FS Timeout Calibration to 7 (max available value).
2370          * The number of PHY clocks that the application programs in
2371          * this field is added to the high/full speed interpacket timeout
2372          * duration in the core to account for any additional delays
2373          * introduced by the PHY. This can be required, because the delay
2374          * introduced by the PHY in generating the linestate condition
2375          * can vary from one PHY to another.
2376          */
2377         usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
2378         usbcfg |= GUSBCFG_TOUTCAL(7);
2379         dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);
2380
2381         /* Restart the Phy Clock */
2382         dwc2_writel(0, hsotg->regs + PCGCTL);
2383
2384         /* Initialize Host Configuration Register */
2385         dwc2_init_fs_ls_pclk_sel(hsotg);
2386         if (hsotg->params.speed == DWC2_SPEED_PARAM_FULL ||
2387             hsotg->params.speed == DWC2_SPEED_PARAM_LOW) {
2388                 hcfg = dwc2_readl(hsotg->regs + HCFG);
2389                 hcfg |= HCFG_FSLSSUPP;
2390                 dwc2_writel(hcfg, hsotg->regs + HCFG);
2391         }
2392
2393         /*
2394          * This bit allows dynamic reloading of the HFIR register during
2395          * runtime. This bit needs to be programmed during initial configuration
2396          * and its value must not be changed during runtime.
2397          */
2398         if (hsotg->params.reload_ctl) {
2399                 hfir = dwc2_readl(hsotg->regs + HFIR);
2400                 hfir |= HFIR_RLDCTRL;
2401                 dwc2_writel(hfir, hsotg->regs + HFIR);
2402         }
2403
2404         if (hsotg->params.dma_desc_enable) {
2405                 u32 op_mode = hsotg->hw_params.op_mode;
2406
2407                 if (hsotg->hw_params.snpsid < DWC2_CORE_REV_2_90a ||
2408                     !hsotg->hw_params.dma_desc_enable ||
2409                     op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE ||
2410                     op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE ||
2411                     op_mode == GHWCFG2_OP_MODE_UNDEFINED) {
2412                         dev_err(hsotg->dev,
2413                                 "Hardware does not support descriptor DMA mode -\n");
2414                         dev_err(hsotg->dev,
2415                                 "falling back to buffer DMA mode.\n");
2416                         hsotg->params.dma_desc_enable = false;
2417                 } else {
2418                         hcfg = dwc2_readl(hsotg->regs + HCFG);
2419                         hcfg |= HCFG_DESCDMA;
2420                         dwc2_writel(hcfg, hsotg->regs + HCFG);
2421                 }
2422         }
2423
2424         /* Configure data FIFO sizes */
2425         dwc2_config_fifos(hsotg);
2426
2427         /* TODO - check this */
2428         /* Clear Host Set HNP Enable in the OTG Control Register */
2429         otgctl = dwc2_readl(hsotg->regs + GOTGCTL);
2430         otgctl &= ~GOTGCTL_HSTSETHNPEN;
2431         dwc2_writel(otgctl, hsotg->regs + GOTGCTL);
2432
2433         /* Make sure the FIFOs are flushed */
2434         dwc2_flush_tx_fifo(hsotg, 0x10 /* all TX FIFOs */);
2435         dwc2_flush_rx_fifo(hsotg);
2436
2437         /* Clear Host Set HNP Enable in the OTG Control Register */
2438         otgctl = dwc2_readl(hsotg->regs + GOTGCTL);
2439         otgctl &= ~GOTGCTL_HSTSETHNPEN;
2440         dwc2_writel(otgctl, hsotg->regs + GOTGCTL);
2441
2442         if (!hsotg->params.dma_desc_enable) {
2443                 int num_channels, i;
2444                 u32 hcchar;
2445
2446                 /* Flush out any leftover queued requests */
2447                 num_channels = hsotg->params.host_channels;
2448                 for (i = 0; i < num_channels; i++) {
2449                         hcchar = dwc2_readl(hsotg->regs + HCCHAR(i));
2450                         hcchar &= ~HCCHAR_CHENA;
2451                         hcchar |= HCCHAR_CHDIS;
2452                         hcchar &= ~HCCHAR_EPDIR;
2453                         dwc2_writel(hcchar, hsotg->regs + HCCHAR(i));
2454                 }
2455
2456                 /* Halt all channels to put them into a known state */
2457                 for (i = 0; i < num_channels; i++) {
2458                         hcchar = dwc2_readl(hsotg->regs + HCCHAR(i));
2459                         hcchar |= HCCHAR_CHENA | HCCHAR_CHDIS;
2460                         hcchar &= ~HCCHAR_EPDIR;
2461                         dwc2_writel(hcchar, hsotg->regs + HCCHAR(i));
2462                         dev_dbg(hsotg->dev, "%s: Halt channel %d\n",
2463                                 __func__, i);
2464
2465                         if (dwc2_hsotg_wait_bit_clear(hsotg, HCCHAR(i),
2466                                                       HCCHAR_CHENA, 1000)) {
2467                                 dev_warn(hsotg->dev, "Unable to clear enable on channel %d\n",
2468                                          i);
2469                         }
2470                 }
2471         }
2472
2473         /* Enable ACG feature in host mode, if supported */
2474         dwc2_enable_acg(hsotg);
2475
2476         /* Turn on the vbus power */
2477         dev_dbg(hsotg->dev, "Init: Port Power? op_state=%d\n", hsotg->op_state);
2478         if (hsotg->op_state == OTG_STATE_A_HOST) {
2479                 u32 hprt0 = dwc2_read_hprt0(hsotg);
2480
2481                 dev_dbg(hsotg->dev, "Init: Power Port (%d)\n",
2482                         !!(hprt0 & HPRT0_PWR));
2483                 if (!(hprt0 & HPRT0_PWR)) {
2484                         hprt0 |= HPRT0_PWR;
2485                         dwc2_writel(hprt0, hsotg->regs + HPRT0);
2486                 }
2487         }
2488
2489         dwc2_enable_host_interrupts(hsotg);
2490 }
2491
2492 /*
2493  * Initializes dynamic portions of the DWC_otg HCD state
2494  *
2495  * Must be called with interrupt disabled and spinlock held
2496  */
2497 static void dwc2_hcd_reinit(struct dwc2_hsotg *hsotg)
2498 {
2499         struct dwc2_host_chan *chan, *chan_tmp;
2500         int num_channels;
2501         int i;
2502
2503         hsotg->flags.d32 = 0;
2504         hsotg->non_periodic_qh_ptr = &hsotg->non_periodic_sched_active;
2505
2506         if (hsotg->params.uframe_sched) {
2507                 hsotg->available_host_channels =
2508                         hsotg->params.host_channels;
2509         } else {
2510                 hsotg->non_periodic_channels = 0;
2511                 hsotg->periodic_channels = 0;
2512         }
2513
2514         /*
2515          * Put all channels in the free channel list and clean up channel
2516          * states
2517          */
2518         list_for_each_entry_safe(chan, chan_tmp, &hsotg->free_hc_list,
2519                                  hc_list_entry)
2520                 list_del_init(&chan->hc_list_entry);
2521
2522         num_channels = hsotg->params.host_channels;
2523         for (i = 0; i < num_channels; i++) {
2524                 chan = hsotg->hc_ptr_array[i];
2525                 list_add_tail(&chan->hc_list_entry, &hsotg->free_hc_list);
2526                 dwc2_hc_cleanup(hsotg, chan);
2527         }
2528
2529         /* Initialize the DWC core for host mode operation */
2530         dwc2_core_host_init(hsotg);
2531 }
2532
2533 static void dwc2_hc_init_split(struct dwc2_hsotg *hsotg,
2534                                struct dwc2_host_chan *chan,
2535                                struct dwc2_qtd *qtd, struct dwc2_hcd_urb *urb)
2536 {
2537         int hub_addr, hub_port;
2538
2539         chan->do_split = 1;
2540         chan->xact_pos = qtd->isoc_split_pos;
2541         chan->complete_split = qtd->complete_split;
2542         dwc2_host_hub_info(hsotg, urb->priv, &hub_addr, &hub_port);
2543         chan->hub_addr = (u8)hub_addr;
2544         chan->hub_port = (u8)hub_port;
2545 }
2546
2547 static void dwc2_hc_init_xfer(struct dwc2_hsotg *hsotg,
2548                               struct dwc2_host_chan *chan,
2549                               struct dwc2_qtd *qtd)
2550 {
2551         struct dwc2_hcd_urb *urb = qtd->urb;
2552         struct dwc2_hcd_iso_packet_desc *frame_desc;
2553
2554         switch (dwc2_hcd_get_pipe_type(&urb->pipe_info)) {
2555         case USB_ENDPOINT_XFER_CONTROL:
2556                 chan->ep_type = USB_ENDPOINT_XFER_CONTROL;
2557
2558                 switch (qtd->control_phase) {
2559                 case DWC2_CONTROL_SETUP:
2560                         dev_vdbg(hsotg->dev, "  Control setup transaction\n");
2561                         chan->do_ping = 0;
2562                         chan->ep_is_in = 0;
2563                         chan->data_pid_start = DWC2_HC_PID_SETUP;
2564                         if (hsotg->params.host_dma)
2565                                 chan->xfer_dma = urb->setup_dma;
2566                         else
2567                                 chan->xfer_buf = urb->setup_packet;
2568                         chan->xfer_len = 8;
2569                         break;
2570
2571                 case DWC2_CONTROL_DATA:
2572                         dev_vdbg(hsotg->dev, "  Control data transaction\n");
2573                         chan->data_pid_start = qtd->data_toggle;
2574                         break;
2575
2576                 case DWC2_CONTROL_STATUS:
2577                         /*
2578                          * Direction is opposite of data direction or IN if no
2579                          * data
2580                          */
2581                         dev_vdbg(hsotg->dev, "  Control status transaction\n");
2582                         if (urb->length == 0)
2583                                 chan->ep_is_in = 1;
2584                         else
2585                                 chan->ep_is_in =
2586                                         dwc2_hcd_is_pipe_out(&urb->pipe_info);
2587                         if (chan->ep_is_in)
2588                                 chan->do_ping = 0;
2589                         chan->data_pid_start = DWC2_HC_PID_DATA1;
2590                         chan->xfer_len = 0;
2591                         if (hsotg->params.host_dma)
2592                                 chan->xfer_dma = hsotg->status_buf_dma;
2593                         else
2594                                 chan->xfer_buf = hsotg->status_buf;
2595                         break;
2596                 }
2597                 break;
2598
2599         case USB_ENDPOINT_XFER_BULK:
2600                 chan->ep_type = USB_ENDPOINT_XFER_BULK;
2601                 break;
2602
2603         case USB_ENDPOINT_XFER_INT:
2604                 chan->ep_type = USB_ENDPOINT_XFER_INT;
2605                 break;
2606
2607         case USB_ENDPOINT_XFER_ISOC:
2608                 chan->ep_type = USB_ENDPOINT_XFER_ISOC;
2609                 if (hsotg->params.dma_desc_enable)
2610                         break;
2611
2612                 frame_desc = &urb->iso_descs[qtd->isoc_frame_index];
2613                 frame_desc->status = 0;
2614
2615                 if (hsotg->params.host_dma) {
2616                         chan->xfer_dma = urb->dma;
2617                         chan->xfer_dma += frame_desc->offset +
2618                                         qtd->isoc_split_offset;
2619                 } else {
2620                         chan->xfer_buf = urb->buf;
2621                         chan->xfer_buf += frame_desc->offset +
2622                                         qtd->isoc_split_offset;
2623                 }
2624
2625                 chan->xfer_len = frame_desc->length - qtd->isoc_split_offset;
2626
2627                 if (chan->xact_pos == DWC2_HCSPLT_XACTPOS_ALL) {
2628                         if (chan->xfer_len <= 188)
2629                                 chan->xact_pos = DWC2_HCSPLT_XACTPOS_ALL;
2630                         else
2631                                 chan->xact_pos = DWC2_HCSPLT_XACTPOS_BEGIN;
2632                 }
2633                 break;
2634         }
2635 }
2636
2637 static int dwc2_alloc_split_dma_aligned_buf(struct dwc2_hsotg *hsotg,
2638                                             struct dwc2_qh *qh,
2639                                             struct dwc2_host_chan *chan)
2640 {
2641         if (!hsotg->unaligned_cache ||
2642             chan->max_packet > DWC2_KMEM_UNALIGNED_BUF_SIZE)
2643                 return -ENOMEM;
2644
2645         if (!qh->dw_align_buf) {
2646                 qh->dw_align_buf = kmem_cache_alloc(hsotg->unaligned_cache,
2647                                                     GFP_ATOMIC | GFP_DMA);
2648                 if (!qh->dw_align_buf)
2649                         return -ENOMEM;
2650         }
2651
2652         qh->dw_align_buf_dma = dma_map_single(hsotg->dev, qh->dw_align_buf,
2653                                               DWC2_KMEM_UNALIGNED_BUF_SIZE,
2654                                               DMA_FROM_DEVICE);
2655
2656         if (dma_mapping_error(hsotg->dev, qh->dw_align_buf_dma)) {
2657                 dev_err(hsotg->dev, "can't map align_buf\n");
2658                 chan->align_buf = 0;
2659                 return -EINVAL;
2660         }
2661
2662         chan->align_buf = qh->dw_align_buf_dma;
2663         return 0;
2664 }
2665
2666 #define DWC2_USB_DMA_ALIGN 4
2667
2668 static void dwc2_free_dma_aligned_buffer(struct urb *urb)
2669 {
2670         void *stored_xfer_buffer;
2671         size_t length;
2672
2673         if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
2674                 return;
2675
2676         /* Restore urb->transfer_buffer from the end of the allocated area */
2677         memcpy(&stored_xfer_buffer, urb->transfer_buffer +
2678                urb->transfer_buffer_length, sizeof(urb->transfer_buffer));
2679
2680         if (usb_urb_dir_in(urb)) {
2681                 if (usb_pipeisoc(urb->pipe))
2682                         length = urb->transfer_buffer_length;
2683                 else
2684                         length = urb->actual_length;
2685
2686                 memcpy(stored_xfer_buffer, urb->transfer_buffer, length);
2687         }
2688         kfree(urb->transfer_buffer);
2689         urb->transfer_buffer = stored_xfer_buffer;
2690
2691         urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
2692 }
2693
2694 static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
2695 {
2696         void *kmalloc_ptr;
2697         size_t kmalloc_size;
2698
2699         if (urb->num_sgs || urb->sg ||
2700             urb->transfer_buffer_length == 0 ||
2701             !((uintptr_t)urb->transfer_buffer & (DWC2_USB_DMA_ALIGN - 1)))
2702                 return 0;
2703
2704         /*
2705          * Allocate a buffer with enough padding for original transfer_buffer
2706          * pointer. This allocation is guaranteed to be aligned properly for
2707          * DMA
2708          */
2709         kmalloc_size = urb->transfer_buffer_length +
2710                 sizeof(urb->transfer_buffer);
2711
2712         kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
2713         if (!kmalloc_ptr)
2714                 return -ENOMEM;
2715
2716         /*
2717          * Position value of original urb->transfer_buffer pointer to the end
2718          * of allocation for later referencing
2719          */
2720         memcpy(kmalloc_ptr + urb->transfer_buffer_length,
2721                &urb->transfer_buffer, sizeof(urb->transfer_buffer));
2722
2723         if (usb_urb_dir_out(urb))
2724                 memcpy(kmalloc_ptr, urb->transfer_buffer,
2725                        urb->transfer_buffer_length);
2726         urb->transfer_buffer = kmalloc_ptr;
2727
2728         urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
2729
2730         return 0;
2731 }
2732
2733 static int dwc2_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
2734                                 gfp_t mem_flags)
2735 {
2736         int ret;
2737
2738         /* We assume setup_dma is always aligned; warn if not */
2739         WARN_ON_ONCE(urb->setup_dma &&
2740                      (urb->setup_dma & (DWC2_USB_DMA_ALIGN - 1)));
2741
2742         ret = dwc2_alloc_dma_aligned_buffer(urb, mem_flags);
2743         if (ret)
2744                 return ret;
2745
2746         ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
2747         if (ret)
2748                 dwc2_free_dma_aligned_buffer(urb);
2749
2750         return ret;
2751 }
2752
2753 static void dwc2_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
2754 {
2755         usb_hcd_unmap_urb_for_dma(hcd, urb);
2756         dwc2_free_dma_aligned_buffer(urb);
2757 }
2758
2759 /**
2760  * dwc2_assign_and_init_hc() - Assigns transactions from a QTD to a free host
2761  * channel and initializes the host channel to perform the transactions. The
2762  * host channel is removed from the free list.
2763  *
2764  * @hsotg: The HCD state structure
2765  * @qh:    Transactions from the first QTD for this QH are selected and assigned
2766  *         to a free host channel
2767  */
2768 static int dwc2_assign_and_init_hc(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
2769 {
2770         struct dwc2_host_chan *chan;
2771         struct dwc2_hcd_urb *urb;
2772         struct dwc2_qtd *qtd;
2773
2774         if (dbg_qh(qh))
2775                 dev_vdbg(hsotg->dev, "%s(%p,%p)\n", __func__, hsotg, qh);
2776
2777         if (list_empty(&qh->qtd_list)) {
2778                 dev_dbg(hsotg->dev, "No QTDs in QH list\n");
2779                 return -ENOMEM;
2780         }
2781
2782         if (list_empty(&hsotg->free_hc_list)) {
2783                 dev_dbg(hsotg->dev, "No free channel to assign\n");
2784                 return -ENOMEM;
2785         }
2786
2787         chan = list_first_entry(&hsotg->free_hc_list, struct dwc2_host_chan,
2788                                 hc_list_entry);
2789
2790         /* Remove host channel from free list */
2791         list_del_init(&chan->hc_list_entry);
2792
2793         qtd = list_first_entry(&qh->qtd_list, struct dwc2_qtd, qtd_list_entry);
2794         urb = qtd->urb;
2795         qh->channel = chan;
2796         qtd->in_process = 1;
2797
2798         /*
2799          * Use usb_pipedevice to determine device address. This address is
2800          * 0 before the SET_ADDRESS command and the correct address afterward.
2801          */
2802         chan->dev_addr = dwc2_hcd_get_dev_addr(&urb->pipe_info);
2803         chan->ep_num = dwc2_hcd_get_ep_num(&urb->pipe_info);
2804         chan->speed = qh->dev_speed;
2805         chan->max_packet = dwc2_max_packet(qh->maxp);
2806
2807         chan->xfer_started = 0;
2808         chan->halt_status = DWC2_HC_XFER_NO_HALT_STATUS;
2809         chan->error_state = (qtd->error_count > 0);
2810         chan->halt_on_queue = 0;
2811         chan->halt_pending = 0;
2812         chan->requests = 0;
2813
2814         /*
2815          * The following values may be modified in the transfer type section
2816          * below. The xfer_len value may be reduced when the transfer is
2817          * started to accommodate the max widths of the XferSize and PktCnt
2818          * fields in the HCTSIZn register.
2819          */
2820
2821         chan->ep_is_in = (dwc2_hcd_is_pipe_in(&urb->pipe_info) != 0);
2822         if (chan->ep_is_in)
2823                 chan->do_ping = 0;
2824         else
2825                 chan->do_ping = qh->ping_state;
2826
2827         chan->data_pid_start = qh->data_toggle;
2828         chan->multi_count = 1;
2829
2830         if (urb->actual_length > urb->length &&
2831             !dwc2_hcd_is_pipe_in(&urb->pipe_info))
2832                 urb->actual_length = urb->length;
2833
2834         if (hsotg->params.host_dma)
2835                 chan->xfer_dma = urb->dma + urb->actual_length;
2836         else
2837                 chan->xfer_buf = (u8 *)urb->buf + urb->actual_length;
2838
2839         chan->xfer_len = urb->length - urb->actual_length;
2840         chan->xfer_count = 0;
2841
2842         /* Set the split attributes if required */
2843         if (qh->do_split)
2844                 dwc2_hc_init_split(hsotg, chan, qtd, urb);
2845         else
2846                 chan->do_split = 0;
2847
2848         /* Set the transfer attributes */
2849         dwc2_hc_init_xfer(hsotg, chan, qtd);
2850
2851         /* For non-dword aligned buffers */
2852         if (hsotg->params.host_dma && qh->do_split &&
2853             chan->ep_is_in && (chan->xfer_dma & 0x3)) {
2854                 dev_vdbg(hsotg->dev, "Non-aligned buffer\n");
2855                 if (dwc2_alloc_split_dma_aligned_buf(hsotg, qh, chan)) {
2856                         dev_err(hsotg->dev,
2857                                 "Failed to allocate memory to handle non-aligned buffer\n");
2858                         /* Add channel back to free list */
2859                         chan->align_buf = 0;
2860                         chan->multi_count = 0;
2861                         list_add_tail(&chan->hc_list_entry,
2862                                       &hsotg->free_hc_list);
2863                         qtd->in_process = 0;
2864                         qh->channel = NULL;
2865                         return -ENOMEM;
2866                 }
2867         } else {
2868                 /*
2869                  * We assume that DMA is always aligned in non-split
2870                  * case or split out case. Warn if not.
2871                  */
2872                 WARN_ON_ONCE(hsotg->params.host_dma &&
2873                              (chan->xfer_dma & 0x3));
2874                 chan->align_buf = 0;
2875         }
2876
2877         if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
2878             chan->ep_type == USB_ENDPOINT_XFER_ISOC)
2879                 /*
2880                  * This value may be modified when the transfer is started
2881                  * to reflect the actual transfer length
2882                  */
2883                 chan->multi_count = dwc2_hb_mult(qh->maxp);
2884
2885         if (hsotg->params.dma_desc_enable) {
2886                 chan->desc_list_addr = qh->desc_list_dma;
2887                 chan->desc_list_sz = qh->desc_list_sz;
2888         }
2889
2890         dwc2_hc_init(hsotg, chan);
2891         chan->qh = qh;
2892
2893         return 0;
2894 }
2895
2896 /**
2897  * dwc2_hcd_select_transactions() - Selects transactions from the HCD transfer
2898  * schedule and assigns them to available host channels. Called from the HCD
2899  * interrupt handler functions.
2900  *
2901  * @hsotg: The HCD state structure
2902  *
2903  * Return: The types of new transactions that were assigned to host channels
2904  */
2905 enum dwc2_transaction_type dwc2_hcd_select_transactions(
2906                 struct dwc2_hsotg *hsotg)
2907 {
2908         enum dwc2_transaction_type ret_val = DWC2_TRANSACTION_NONE;
2909         struct list_head *qh_ptr;
2910         struct dwc2_qh *qh;
2911         int num_channels;
2912
2913 #ifdef DWC2_DEBUG_SOF
2914         dev_vdbg(hsotg->dev, "  Select Transactions\n");
2915 #endif
2916
2917         /* Process entries in the periodic ready list */
2918         qh_ptr = hsotg->periodic_sched_ready.next;
2919         while (qh_ptr != &hsotg->periodic_sched_ready) {
2920                 if (list_empty(&hsotg->free_hc_list))
2921                         break;
2922                 if (hsotg->params.uframe_sched) {
2923                         if (hsotg->available_host_channels <= 1)
2924                                 break;
2925                         hsotg->available_host_channels--;
2926                 }
2927                 qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
2928                 if (dwc2_assign_and_init_hc(hsotg, qh))
2929                         break;
2930
2931                 /*
2932                  * Move the QH from the periodic ready schedule to the
2933                  * periodic assigned schedule
2934                  */
2935                 qh_ptr = qh_ptr->next;
2936                 list_move_tail(&qh->qh_list_entry,
2937                                &hsotg->periodic_sched_assigned);
2938                 ret_val = DWC2_TRANSACTION_PERIODIC;
2939         }
2940
2941         /*
2942          * Process entries in the inactive portion of the non-periodic
2943          * schedule. Some free host channels may not be used if they are
2944          * reserved for periodic transfers.
2945          */
2946         num_channels = hsotg->params.host_channels;
2947         qh_ptr = hsotg->non_periodic_sched_inactive.next;
2948         while (qh_ptr != &hsotg->non_periodic_sched_inactive) {
2949                 if (!hsotg->params.uframe_sched &&
2950                     hsotg->non_periodic_channels >= num_channels -
2951                                                 hsotg->periodic_channels)
2952                         break;
2953                 if (list_empty(&hsotg->free_hc_list))
2954                         break;
2955                 qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
2956                 if (hsotg->params.uframe_sched) {
2957                         if (hsotg->available_host_channels < 1)
2958                                 break;
2959                         hsotg->available_host_channels--;
2960                 }
2961
2962                 if (dwc2_assign_and_init_hc(hsotg, qh))
2963                         break;
2964
2965                 /*
2966                  * Move the QH from the non-periodic inactive schedule to the
2967                  * non-periodic active schedule
2968                  */
2969                 qh_ptr = qh_ptr->next;
2970                 list_move_tail(&qh->qh_list_entry,
2971                                &hsotg->non_periodic_sched_active);
2972
2973                 if (ret_val == DWC2_TRANSACTION_NONE)
2974                         ret_val = DWC2_TRANSACTION_NON_PERIODIC;
2975                 else
2976                         ret_val = DWC2_TRANSACTION_ALL;
2977
2978                 if (!hsotg->params.uframe_sched)
2979                         hsotg->non_periodic_channels++;
2980         }
2981
2982         return ret_val;
2983 }
2984
2985 /**
2986  * dwc2_queue_transaction() - Attempts to queue a single transaction request for
2987  * a host channel associated with either a periodic or non-periodic transfer
2988  *
2989  * @hsotg: The HCD state structure
2990  * @chan:  Host channel descriptor associated with either a periodic or
2991  *         non-periodic transfer
2992  * @fifo_dwords_avail: Number of DWORDs available in the periodic Tx FIFO
2993  *                     for periodic transfers or the non-periodic Tx FIFO
2994  *                     for non-periodic transfers
2995  *
2996  * Return: 1 if a request is queued and more requests may be needed to
2997  * complete the transfer, 0 if no more requests are required for this
2998  * transfer, -1 if there is insufficient space in the Tx FIFO
2999  *
3000  * This function assumes that there is space available in the appropriate
3001  * request queue. For an OUT transfer or SETUP transaction in Slave mode,
3002  * it checks whether space is available in the appropriate Tx FIFO.
3003  *
3004  * Must be called with interrupt disabled and spinlock held
3005  */
3006 static int dwc2_queue_transaction(struct dwc2_hsotg *hsotg,
3007                                   struct dwc2_host_chan *chan,
3008                                   u16 fifo_dwords_avail)
3009 {
3010         int retval = 0;
3011
3012         if (chan->do_split)
3013                 /* Put ourselves on the list to keep order straight */
3014                 list_move_tail(&chan->split_order_list_entry,
3015                                &hsotg->split_order);
3016
3017         if (hsotg->params.host_dma) {
3018                 if (hsotg->params.dma_desc_enable) {
3019                         if (!chan->xfer_started ||
3020                             chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
3021                                 dwc2_hcd_start_xfer_ddma(hsotg, chan->qh);
3022                                 chan->qh->ping_state = 0;
3023                         }
3024                 } else if (!chan->xfer_started) {
3025                         dwc2_hc_start_transfer(hsotg, chan);
3026                         chan->qh->ping_state = 0;
3027                 }
3028         } else if (chan->halt_pending) {
3029                 /* Don't queue a request if the channel has been halted */
3030         } else if (chan->halt_on_queue) {
3031                 dwc2_hc_halt(hsotg, chan, chan->halt_status);
3032         } else if (chan->do_ping) {
3033                 if (!chan->xfer_started)
3034                         dwc2_hc_start_transfer(hsotg, chan);
3035         } else if (!chan->ep_is_in ||
3036                    chan->data_pid_start == DWC2_HC_PID_SETUP) {
3037                 if ((fifo_dwords_avail * 4) >= chan->max_packet) {
3038                         if (!chan->xfer_started) {
3039                                 dwc2_hc_start_transfer(hsotg, chan);
3040                                 retval = 1;
3041                         } else {
3042                                 retval = dwc2_hc_continue_transfer(hsotg, chan);
3043                         }
3044                 } else {
3045                         retval = -1;
3046                 }
3047         } else {
3048                 if (!chan->xfer_started) {
3049                         dwc2_hc_start_transfer(hsotg, chan);
3050                         retval = 1;
3051                 } else {
3052                         retval = dwc2_hc_continue_transfer(hsotg, chan);
3053                 }
3054         }
3055
3056         return retval;
3057 }
3058
3059 /*
3060  * Processes periodic channels for the next frame and queues transactions for
3061  * these channels to the DWC_otg controller. After queueing transactions, the
3062  * Periodic Tx FIFO Empty interrupt is enabled if there are more transactions
3063  * to queue as Periodic Tx FIFO or request queue space becomes available.
3064  * Otherwise, the Periodic Tx FIFO Empty interrupt is disabled.
3065  *
3066  * Must be called with interrupt disabled and spinlock held
3067  */
3068 static void dwc2_process_periodic_channels(struct dwc2_hsotg *hsotg)
3069 {
3070         struct list_head *qh_ptr;
3071         struct dwc2_qh *qh;
3072         u32 tx_status;
3073         u32 fspcavail;
3074         u32 gintmsk;
3075         int status;
3076         bool no_queue_space = false;
3077         bool no_fifo_space = false;
3078         u32 qspcavail;
3079
3080         /* If empty list then just adjust interrupt enables */
3081         if (list_empty(&hsotg->periodic_sched_assigned))
3082                 goto exit;
3083
3084         if (dbg_perio())
3085                 dev_vdbg(hsotg->dev, "Queue periodic transactions\n");
3086
3087         tx_status = dwc2_readl(hsotg->regs + HPTXSTS);
3088         qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
3089                     TXSTS_QSPCAVAIL_SHIFT;
3090         fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
3091                     TXSTS_FSPCAVAIL_SHIFT;
3092
3093         if (dbg_perio()) {
3094                 dev_vdbg(hsotg->dev, "  P Tx Req Queue Space Avail (before queue): %d\n",
3095                          qspcavail);
3096                 dev_vdbg(hsotg->dev, "  P Tx FIFO Space Avail (before queue): %d\n",
3097                          fspcavail);
3098         }
3099
3100         qh_ptr = hsotg->periodic_sched_assigned.next;
3101         while (qh_ptr != &hsotg->periodic_sched_assigned) {
3102                 tx_status = dwc2_readl(hsotg->regs + HPTXSTS);
3103                 qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
3104                             TXSTS_QSPCAVAIL_SHIFT;
3105                 if (qspcavail == 0) {
3106                         no_queue_space = true;
3107                         break;
3108                 }
3109
3110                 qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
3111                 if (!qh->channel) {
3112                         qh_ptr = qh_ptr->next;
3113                         continue;
3114                 }
3115
3116                 /* Make sure EP's TT buffer is clean before queueing qtds */
3117                 if (qh->tt_buffer_dirty) {
3118                         qh_ptr = qh_ptr->next;
3119                         continue;
3120                 }
3121
3122                 /*
3123                  * Set a flag if we're queuing high-bandwidth in slave mode.
3124                  * The flag prevents any halts to get into the request queue in
3125                  * the middle of multiple high-bandwidth packets getting queued.
3126                  */
3127                 if (!hsotg->params.host_dma &&
3128                     qh->channel->multi_count > 1)
3129                         hsotg->queuing_high_bandwidth = 1;
3130
3131                 fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
3132                             TXSTS_FSPCAVAIL_SHIFT;
3133                 status = dwc2_queue_transaction(hsotg, qh->channel, fspcavail);
3134                 if (status < 0) {
3135                         no_fifo_space = true;
3136                         break;
3137                 }
3138
3139                 /*
3140                  * In Slave mode, stay on the current transfer until there is
3141                  * nothing more to do or the high-bandwidth request count is
3142                  * reached. In DMA mode, only need to queue one request. The
3143                  * controller automatically handles multiple packets for
3144                  * high-bandwidth transfers.
3145                  */
3146                 if (hsotg->params.host_dma || status == 0 ||
3147                     qh->channel->requests == qh->channel->multi_count) {
3148                         qh_ptr = qh_ptr->next;
3149                         /*
3150                          * Move the QH from the periodic assigned schedule to
3151                          * the periodic queued schedule
3152                          */
3153                         list_move_tail(&qh->qh_list_entry,
3154                                        &hsotg->periodic_sched_queued);
3155
3156                         /* done queuing high bandwidth */
3157                         hsotg->queuing_high_bandwidth = 0;
3158                 }
3159         }
3160
3161 exit:
3162         if (no_queue_space || no_fifo_space ||
3163             (!hsotg->params.host_dma &&
3164              !list_empty(&hsotg->periodic_sched_assigned))) {
3165                 /*
3166                  * May need to queue more transactions as the request
3167                  * queue or Tx FIFO empties. Enable the periodic Tx
3168                  * FIFO empty interrupt. (Always use the half-empty
3169                  * level to ensure that new requests are loaded as
3170                  * soon as possible.)
3171                  */
3172                 gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
3173                 if (!(gintmsk & GINTSTS_PTXFEMP)) {
3174                         gintmsk |= GINTSTS_PTXFEMP;
3175                         dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
3176                 }
3177         } else {
3178                 /*
3179                  * Disable the Tx FIFO empty interrupt since there are
3180                  * no more transactions that need to be queued right
3181                  * now. This function is called from interrupt
3182                  * handlers to queue more transactions as transfer
3183                  * states change.
3184                  */
3185                 gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
3186                 if (gintmsk & GINTSTS_PTXFEMP) {
3187                         gintmsk &= ~GINTSTS_PTXFEMP;
3188                         dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
3189                 }
3190         }
3191 }
3192
3193 /*
3194  * Processes active non-periodic channels and queues transactions for these
3195  * channels to the DWC_otg controller. After queueing transactions, the NP Tx
3196  * FIFO Empty interrupt is enabled if there are more transactions to queue as
3197  * NP Tx FIFO or request queue space becomes available. Otherwise, the NP Tx
3198  * FIFO Empty interrupt is disabled.
3199  *
3200  * Must be called with interrupt disabled and spinlock held
3201  */
3202 static void dwc2_process_non_periodic_channels(struct dwc2_hsotg *hsotg)
3203 {
3204         struct list_head *orig_qh_ptr;
3205         struct dwc2_qh *qh;
3206         u32 tx_status;
3207         u32 qspcavail;
3208         u32 fspcavail;
3209         u32 gintmsk;
3210         int status;
3211         int no_queue_space = 0;
3212         int no_fifo_space = 0;
3213         int more_to_do = 0;
3214
3215         dev_vdbg(hsotg->dev, "Queue non-periodic transactions\n");
3216
3217         tx_status = dwc2_readl(hsotg->regs + GNPTXSTS);
3218         qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
3219                     TXSTS_QSPCAVAIL_SHIFT;
3220         fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
3221                     TXSTS_FSPCAVAIL_SHIFT;
3222         dev_vdbg(hsotg->dev, "  NP Tx Req Queue Space Avail (before queue): %d\n",
3223                  qspcavail);
3224         dev_vdbg(hsotg->dev, "  NP Tx FIFO Space Avail (before queue): %d\n",
3225                  fspcavail);
3226
3227         /*
3228          * Keep track of the starting point. Skip over the start-of-list
3229          * entry.
3230          */
3231         if (hsotg->non_periodic_qh_ptr == &hsotg->non_periodic_sched_active)
3232                 hsotg->non_periodic_qh_ptr = hsotg->non_periodic_qh_ptr->next;
3233         orig_qh_ptr = hsotg->non_periodic_qh_ptr;
3234
3235         /*
3236          * Process once through the active list or until no more space is
3237          * available in the request queue or the Tx FIFO
3238          */
3239         do {
3240                 tx_status = dwc2_readl(hsotg->regs + GNPTXSTS);
3241                 qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
3242                             TXSTS_QSPCAVAIL_SHIFT;
3243                 if (!hsotg->params.host_dma && qspcavail == 0) {
3244                         no_queue_space = 1;
3245                         break;
3246                 }
3247
3248                 qh = list_entry(hsotg->non_periodic_qh_ptr, struct dwc2_qh,
3249                                 qh_list_entry);
3250                 if (!qh->channel)
3251                         goto next;
3252
3253                 /* Make sure EP's TT buffer is clean before queueing qtds */
3254                 if (qh->tt_buffer_dirty)
3255                         goto next;
3256
3257                 fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
3258                             TXSTS_FSPCAVAIL_SHIFT;
3259                 status = dwc2_queue_transaction(hsotg, qh->channel, fspcavail);
3260
3261                 if (status > 0) {
3262                         more_to_do = 1;
3263                 } else if (status < 0) {
3264                         no_fifo_space = 1;
3265                         break;
3266                 }
3267 next:
3268                 /* Advance to next QH, skipping start-of-list entry */
3269                 hsotg->non_periodic_qh_ptr = hsotg->non_periodic_qh_ptr->next;
3270                 if (hsotg->non_periodic_qh_ptr ==
3271                                 &hsotg->non_periodic_sched_active)
3272                         hsotg->non_periodic_qh_ptr =
3273                                         hsotg->non_periodic_qh_ptr->next;
3274         } while (hsotg->non_periodic_qh_ptr != orig_qh_ptr);
3275
3276         if (!hsotg->params.host_dma) {
3277                 tx_status = dwc2_readl(hsotg->regs + GNPTXSTS);
3278                 qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
3279                             TXSTS_QSPCAVAIL_SHIFT;
3280                 fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
3281                             TXSTS_FSPCAVAIL_SHIFT;
3282                 dev_vdbg(hsotg->dev,
3283                          "  NP Tx Req Queue Space Avail (after queue): %d\n",
3284                          qspcavail);
3285                 dev_vdbg(hsotg->dev,
3286                          "  NP Tx FIFO Space Avail (after queue): %d\n",
3287                          fspcavail);
3288
3289                 if (more_to_do || no_queue_space || no_fifo_space) {
3290                         /*
3291                          * May need to queue more transactions as the request
3292                          * queue or Tx FIFO empties. Enable the non-periodic
3293                          * Tx FIFO empty interrupt. (Always use the half-empty
3294                          * level to ensure that new requests are loaded as
3295                          * soon as possible.)
3296                          */
3297                         gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
3298                         gintmsk |= GINTSTS_NPTXFEMP;
3299                         dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
3300                 } else {
3301                         /*
3302                          * Disable the Tx FIFO empty interrupt since there are
3303                          * no more transactions that need to be queued right
3304                          * now. This function is called from interrupt
3305                          * handlers to queue more transactions as transfer
3306                          * states change.
3307                          */
3308                         gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
3309                         gintmsk &= ~GINTSTS_NPTXFEMP;
3310                         dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
3311                 }
3312         }
3313 }
3314
3315 /**
3316  * dwc2_hcd_queue_transactions() - Processes the currently active host channels
3317  * and queues transactions for these channels to the DWC_otg controller. Called
3318  * from the HCD interrupt handler functions.
3319  *
3320  * @hsotg:   The HCD state structure
3321  * @tr_type: The type(s) of transactions to queue (non-periodic, periodic,
3322  *           or both)
3323  *
3324  * Must be called with interrupt disabled and spinlock held
3325  */
3326 void dwc2_hcd_queue_transactions(struct dwc2_hsotg *hsotg,
3327                                  enum dwc2_transaction_type tr_type)
3328 {
3329 #ifdef DWC2_DEBUG_SOF
3330         dev_vdbg(hsotg->dev, "Queue Transactions\n");
3331 #endif
3332         /* Process host channels associated with periodic transfers */
3333         if (tr_type == DWC2_TRANSACTION_PERIODIC ||
3334             tr_type == DWC2_TRANSACTION_ALL)
3335                 dwc2_process_periodic_channels(hsotg);
3336
3337         /* Process host channels associated with non-periodic transfers */
3338         if (tr_type == DWC2_TRANSACTION_NON_PERIODIC ||
3339             tr_type == DWC2_TRANSACTION_ALL) {
3340                 if (!list_empty(&hsotg->non_periodic_sched_active)) {
3341                         dwc2_process_non_periodic_channels(hsotg);
3342                 } else {
3343                         /*
3344                          * Ensure NP Tx FIFO empty interrupt is disabled when
3345                          * there are no non-periodic transfers to process
3346                          */
3347                         u32 gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
3348
3349                         gintmsk &= ~GINTSTS_NPTXFEMP;
3350                         dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
3351                 }
3352         }
3353 }
3354
3355 static void dwc2_conn_id_status_change(struct work_struct *work)
3356 {
3357         struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
3358                                                 wf_otg);
3359         u32 count = 0;
3360         u32 gotgctl;
3361         unsigned long flags;
3362
3363         dev_dbg(hsotg->dev, "%s()\n", __func__);
3364
3365         gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
3366         dev_dbg(hsotg->dev, "gotgctl=%0x\n", gotgctl);
3367         dev_dbg(hsotg->dev, "gotgctl.b.conidsts=%d\n",
3368                 !!(gotgctl & GOTGCTL_CONID_B));
3369
3370         /* B-Device connector (Device Mode) */
3371         if (gotgctl & GOTGCTL_CONID_B) {
3372                 dwc2_vbus_supply_exit(hsotg);
3373                 /* Wait for switch to device mode */
3374                 dev_dbg(hsotg->dev, "connId B\n");
3375                 if (hsotg->bus_suspended) {
3376                         dev_info(hsotg->dev,
3377                                  "Do port resume before switching to device mode\n");
3378                         dwc2_port_resume(hsotg);
3379                 }
3380                 while (!dwc2_is_device_mode(hsotg)) {
3381                         dev_info(hsotg->dev,
3382                                  "Waiting for Peripheral Mode, Mode=%s\n",
3383                                  dwc2_is_host_mode(hsotg) ? "Host" :
3384                                  "Peripheral");
3385                         msleep(20);
3386                         /*
3387                          * Sometimes the initial GOTGCTRL read is wrong, so
3388                          * check it again and jump to host mode if that was
3389                          * the case.
3390                          */
3391                         gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
3392                         if (!(gotgctl & GOTGCTL_CONID_B))
3393                                 goto host;
3394                         if (++count > 250)
3395                                 break;
3396                 }
3397                 if (count > 250)
3398                         dev_err(hsotg->dev,
3399                                 "Connection id status change timed out\n");
3400                 hsotg->op_state = OTG_STATE_B_PERIPHERAL;
3401                 dwc2_core_init(hsotg, false);
3402                 dwc2_enable_global_interrupts(hsotg);
3403                 spin_lock_irqsave(&hsotg->lock, flags);
3404                 dwc2_hsotg_core_init_disconnected(hsotg, false);
3405                 spin_unlock_irqrestore(&hsotg->lock, flags);
3406                 /* Enable ACG feature in device mode,if supported */
3407                 dwc2_enable_acg(hsotg);
3408                 dwc2_hsotg_core_connect(hsotg);
3409         } else {
3410 host:
3411                 /* A-Device connector (Host Mode) */
3412                 dev_dbg(hsotg->dev, "connId A\n");
3413                 while (!dwc2_is_host_mode(hsotg)) {
3414                         dev_info(hsotg->dev, "Waiting for Host Mode, Mode=%s\n",
3415                                  dwc2_is_host_mode(hsotg) ?
3416                                  "Host" : "Peripheral");
3417                         msleep(20);
3418                         if (++count > 250)
3419                                 break;
3420                 }
3421                 if (count > 250)
3422                         dev_err(hsotg->dev,
3423                                 "Connection id status change timed out\n");
3424
3425                 spin_lock_irqsave(&hsotg->lock, flags);
3426                 dwc2_hsotg_disconnect(hsotg);
3427                 spin_unlock_irqrestore(&hsotg->lock, flags);
3428
3429                 hsotg->op_state = OTG_STATE_A_HOST;
3430                 /* Initialize the Core for Host mode */
3431                 dwc2_core_init(hsotg, false);
3432                 dwc2_enable_global_interrupts(hsotg);
3433                 dwc2_hcd_start(hsotg);
3434         }
3435 }
3436
3437 static void dwc2_wakeup_detected(struct timer_list *t)
3438 {
3439         struct dwc2_hsotg *hsotg = from_timer(hsotg, t, wkp_timer);
3440         u32 hprt0;
3441
3442         dev_dbg(hsotg->dev, "%s()\n", __func__);
3443
3444         /*
3445          * Clear the Resume after 70ms. (Need 20 ms minimum. Use 70 ms
3446          * so that OPT tests pass with all PHYs.)
3447          */
3448         hprt0 = dwc2_read_hprt0(hsotg);
3449         dev_dbg(hsotg->dev, "Resume: HPRT0=%0x\n", hprt0);
3450         hprt0 &= ~HPRT0_RES;
3451         dwc2_writel(hprt0, hsotg->regs + HPRT0);
3452         dev_dbg(hsotg->dev, "Clear Resume: HPRT0=%0x\n",
3453                 dwc2_readl(hsotg->regs + HPRT0));
3454
3455         dwc2_hcd_rem_wakeup(hsotg);
3456         hsotg->bus_suspended = false;
3457
3458         /* Change to L0 state */
3459         hsotg->lx_state = DWC2_L0;
3460 }
3461
3462 static int dwc2_host_is_b_hnp_enabled(struct dwc2_hsotg *hsotg)
3463 {
3464         struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);
3465
3466         return hcd->self.b_hnp_enable;
3467 }
3468
3469 /* Must NOT be called with interrupt disabled or spinlock held */
3470 static void dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
3471 {
3472         unsigned long flags;
3473         u32 hprt0;
3474         u32 pcgctl;
3475         u32 gotgctl;
3476
3477         dev_dbg(hsotg->dev, "%s()\n", __func__);
3478
3479         spin_lock_irqsave(&hsotg->lock, flags);
3480
3481         if (windex == hsotg->otg_port && dwc2_host_is_b_hnp_enabled(hsotg)) {
3482                 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
3483                 gotgctl |= GOTGCTL_HSTSETHNPEN;
3484                 dwc2_writel(gotgctl, hsotg->regs + GOTGCTL);
3485                 hsotg->op_state = OTG_STATE_A_SUSPEND;
3486         }
3487
3488         hprt0 = dwc2_read_hprt0(hsotg);
3489         hprt0 |= HPRT0_SUSP;
3490         dwc2_writel(hprt0, hsotg->regs + HPRT0);
3491
3492         hsotg->bus_suspended = true;
3493
3494         /*
3495          * If power_down is supported, Phy clock will be suspended
3496          * after registers are backuped.
3497          */
3498         if (!hsotg->params.power_down) {
3499                 /* Suspend the Phy Clock */
3500                 pcgctl = dwc2_readl(hsotg->regs + PCGCTL);
3501                 pcgctl |= PCGCTL_STOPPCLK;
3502                 dwc2_writel(pcgctl, hsotg->regs + PCGCTL);
3503                 udelay(10);
3504         }
3505
3506         /* For HNP the bus must be suspended for at least 200ms */
3507         if (dwc2_host_is_b_hnp_enabled(hsotg)) {
3508                 pcgctl = dwc2_readl(hsotg->regs + PCGCTL);
3509                 pcgctl &= ~PCGCTL_STOPPCLK;
3510                 dwc2_writel(pcgctl, hsotg->regs + PCGCTL);
3511
3512                 spin_unlock_irqrestore(&hsotg->lock, flags);
3513
3514                 msleep(200);
3515         } else {
3516                 spin_unlock_irqrestore(&hsotg->lock, flags);
3517         }
3518 }
3519
3520 /* Must NOT be called with interrupt disabled or spinlock held */
3521 static void dwc2_port_resume(struct dwc2_hsotg *hsotg)
3522 {
3523         unsigned long flags;
3524         u32 hprt0;
3525         u32 pcgctl;
3526
3527         spin_lock_irqsave(&hsotg->lock, flags);
3528
3529         /*
3530          * If power_down is supported, Phy clock is already resumed
3531          * after registers restore.
3532          */
3533         if (!hsotg->params.power_down) {
3534                 pcgctl = dwc2_readl(hsotg->regs + PCGCTL);
3535                 pcgctl &= ~PCGCTL_STOPPCLK;
3536                 dwc2_writel(pcgctl, hsotg->regs + PCGCTL);
3537                 spin_unlock_irqrestore(&hsotg->lock, flags);
3538                 msleep(20);
3539                 spin_lock_irqsave(&hsotg->lock, flags);
3540         }
3541
3542         hprt0 = dwc2_read_hprt0(hsotg);
3543         hprt0 |= HPRT0_RES;
3544         hprt0 &= ~HPRT0_SUSP;
3545         dwc2_writel(hprt0, hsotg->regs + HPRT0);
3546         spin_unlock_irqrestore(&hsotg->lock, flags);
3547
3548         msleep(USB_RESUME_TIMEOUT);
3549
3550         spin_lock_irqsave(&hsotg->lock, flags);
3551         hprt0 = dwc2_read_hprt0(hsotg);
3552         hprt0 &= ~(HPRT0_RES | HPRT0_SUSP);
3553         dwc2_writel(hprt0, hsotg->regs + HPRT0);
3554         hsotg->bus_suspended = false;
3555         spin_unlock_irqrestore(&hsotg->lock, flags);
3556 }
3557
3558 /* Handles hub class-specific requests */
3559 static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
3560                                 u16 wvalue, u16 windex, char *buf, u16 wlength)
3561 {
3562         struct usb_hub_descriptor *hub_desc;
3563         int retval = 0;
3564         u32 hprt0;
3565         u32 port_status;
3566         u32 speed;
3567         u32 pcgctl;
3568
3569         switch (typereq) {
3570         case ClearHubFeature:
3571                 dev_dbg(hsotg->dev, "ClearHubFeature %1xh\n", wvalue);
3572
3573                 switch (wvalue) {
3574                 case C_HUB_LOCAL_POWER:
3575                 case C_HUB_OVER_CURRENT:
3576                         /* Nothing required here */
3577                         break;
3578
3579                 default:
3580                         retval = -EINVAL;
3581                         dev_err(hsotg->dev,
3582                                 "ClearHubFeature request %1xh unknown\n",
3583                                 wvalue);
3584                 }
3585                 break;
3586
3587         case ClearPortFeature:
3588                 if (wvalue != USB_PORT_FEAT_L1)
3589                         if (!windex || windex > 1)
3590                                 goto error;
3591                 switch (wvalue) {
3592                 case USB_PORT_FEAT_ENABLE:
3593                         dev_dbg(hsotg->dev,
3594                                 "ClearPortFeature USB_PORT_FEAT_ENABLE\n");
3595                         hprt0 = dwc2_read_hprt0(hsotg);
3596                         hprt0 |= HPRT0_ENA;
3597                         dwc2_writel(hprt0, hsotg->regs + HPRT0);
3598                         break;
3599
3600                 case USB_PORT_FEAT_SUSPEND:
3601                         dev_dbg(hsotg->dev,
3602                                 "ClearPortFeature USB_PORT_FEAT_SUSPEND\n");
3603
3604                         if (hsotg->bus_suspended) {
3605                                 if (hsotg->hibernated)
3606                                         dwc2_exit_hibernation(hsotg, 0, 0, 1);
3607                                 else
3608                                         dwc2_port_resume(hsotg);
3609                         }
3610                         break;
3611
3612                 case USB_PORT_FEAT_POWER:
3613                         dev_dbg(hsotg->dev,
3614                                 "ClearPortFeature USB_PORT_FEAT_POWER\n");
3615                         hprt0 = dwc2_read_hprt0(hsotg);
3616                         hprt0 &= ~HPRT0_PWR;
3617                         dwc2_writel(hprt0, hsotg->regs + HPRT0);
3618                         break;
3619
3620                 case USB_PORT_FEAT_INDICATOR:
3621                         dev_dbg(hsotg->dev,
3622                                 "ClearPortFeature USB_PORT_FEAT_INDICATOR\n");
3623                         /* Port indicator not supported */
3624                         break;
3625
3626                 case USB_PORT_FEAT_C_CONNECTION:
3627                         /*
3628                          * Clears driver's internal Connect Status Change flag
3629                          */
3630                         dev_dbg(hsotg->dev,
3631                                 "ClearPortFeature USB_PORT_FEAT_C_CONNECTION\n");
3632                         hsotg->flags.b.port_connect_status_change = 0;
3633                         break;
3634
3635                 case USB_PORT_FEAT_C_RESET:
3636                         /* Clears driver's internal Port Reset Change flag */
3637                         dev_dbg(hsotg->dev,
3638                                 "ClearPortFeature USB_PORT_FEAT_C_RESET\n");
3639                         hsotg->flags.b.port_reset_change = 0;
3640                         break;
3641
3642                 case USB_PORT_FEAT_C_ENABLE:
3643                         /*
3644                          * Clears the driver's internal Port Enable/Disable
3645                          * Change flag
3646                          */
3647                         dev_dbg(hsotg->dev,
3648                                 "ClearPortFeature USB_PORT_FEAT_C_ENABLE\n");
3649                         hsotg->flags.b.port_enable_change = 0;
3650                         break;
3651
3652                 case USB_PORT_FEAT_C_SUSPEND:
3653                         /*
3654                          * Clears the driver's internal Port Suspend Change
3655                          * flag, which is set when resume signaling on the host
3656                          * port is complete
3657                          */
3658                         dev_dbg(hsotg->dev,
3659                                 "ClearPortFeature USB_PORT_FEAT_C_SUSPEND\n");
3660                         hsotg->flags.b.port_suspend_change = 0;
3661                         break;
3662
3663                 case USB_PORT_FEAT_C_PORT_L1:
3664                         dev_dbg(hsotg->dev,
3665                                 "ClearPortFeature USB_PORT_FEAT_C_PORT_L1\n");
3666                         hsotg->flags.b.port_l1_change = 0;
3667                         break;
3668
3669                 case USB_PORT_FEAT_C_OVER_CURRENT:
3670                         dev_dbg(hsotg->dev,
3671                                 "ClearPortFeature USB_PORT_FEAT_C_OVER_CURRENT\n");
3672                         hsotg->flags.b.port_over_current_change = 0;
3673                         break;
3674
3675                 default:
3676                         retval = -EINVAL;
3677                         dev_err(hsotg->dev,
3678                                 "ClearPortFeature request %1xh unknown or unsupported\n",
3679                                 wvalue);
3680                 }
3681                 break;
3682
3683         case GetHubDescriptor:
3684                 dev_dbg(hsotg->dev, "GetHubDescriptor\n");
3685                 hub_desc = (struct usb_hub_descriptor *)buf;
3686                 hub_desc->bDescLength = 9;
3687                 hub_desc->bDescriptorType = USB_DT_HUB;
3688                 hub_desc->bNbrPorts = 1;
3689                 hub_desc->wHubCharacteristics =
3690                         cpu_to_le16(HUB_CHAR_COMMON_LPSM |
3691                                     HUB_CHAR_INDV_PORT_OCPM);
3692                 hub_desc->bPwrOn2PwrGood = 1;
3693                 hub_desc->bHubContrCurrent = 0;
3694                 hub_desc->u.hs.DeviceRemovable[0] = 0;
3695                 hub_desc->u.hs.DeviceRemovable[1] = 0xff;
3696                 break;
3697
3698         case GetHubStatus:
3699                 dev_dbg(hsotg->dev, "GetHubStatus\n");
3700                 memset(buf, 0, 4);
3701                 break;
3702
3703         case GetPortStatus:
3704                 dev_vdbg(hsotg->dev,
3705                          "GetPortStatus wIndex=0x%04x flags=0x%08x\n", windex,
3706                          hsotg->flags.d32);
3707                 if (!windex || windex > 1)
3708                         goto error;
3709
3710                 port_status = 0;
3711                 if (hsotg->flags.b.port_connect_status_change)
3712                         port_status |= USB_PORT_STAT_C_CONNECTION << 16;
3713                 if (hsotg->flags.b.port_enable_change)
3714                         port_status |= USB_PORT_STAT_C_ENABLE << 16;
3715                 if (hsotg->flags.b.port_suspend_change)
3716                         port_status |= USB_PORT_STAT_C_SUSPEND << 16;
3717                 if (hsotg->flags.b.port_l1_change)
3718                         port_status |= USB_PORT_STAT_C_L1 << 16;
3719                 if (hsotg->flags.b.port_reset_change)
3720                         port_status |= USB_PORT_STAT_C_RESET << 16;
3721                 if (hsotg->flags.b.port_over_current_change) {
3722                         dev_warn(hsotg->dev, "Overcurrent change detected\n");
3723                         port_status |= USB_PORT_STAT_C_OVERCURRENT << 16;
3724                 }
3725
3726                 if (!hsotg->flags.b.port_connect_status) {
3727                         /*
3728                          * The port is disconnected, which means the core is
3729                          * either in device mode or it soon will be. Just
3730                          * return 0's for the remainder of the port status
3731                          * since the port register can't be read if the core
3732                          * is in device mode.
3733                          */
3734                         *(__le32 *)buf = cpu_to_le32(port_status);
3735                         break;
3736                 }
3737
3738                 hprt0 = dwc2_readl(hsotg->regs + HPRT0);
3739                 dev_vdbg(hsotg->dev, "  HPRT0: 0x%08x\n", hprt0);
3740
3741                 if (hprt0 & HPRT0_CONNSTS)
3742                         port_status |= USB_PORT_STAT_CONNECTION;
3743                 if (hprt0 & HPRT0_ENA)
3744                         port_status |= USB_PORT_STAT_ENABLE;
3745                 if (hprt0 & HPRT0_SUSP)
3746                         port_status |= USB_PORT_STAT_SUSPEND;
3747                 if (hprt0 & HPRT0_OVRCURRACT)
3748                         port_status |= USB_PORT_STAT_OVERCURRENT;
3749                 if (hprt0 & HPRT0_RST)
3750                         port_status |= USB_PORT_STAT_RESET;
3751                 if (hprt0 & HPRT0_PWR)
3752                         port_status |= USB_PORT_STAT_POWER;
3753
3754                 speed = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT;
3755                 if (speed == HPRT0_SPD_HIGH_SPEED)
3756                         port_status |= USB_PORT_STAT_HIGH_SPEED;
3757                 else if (speed == HPRT0_SPD_LOW_SPEED)
3758                         port_status |= USB_PORT_STAT_LOW_SPEED;
3759
3760                 if (hprt0 & HPRT0_TSTCTL_MASK)
3761                         port_status |= USB_PORT_STAT_TEST;
3762                 /* USB_PORT_FEAT_INDICATOR unsupported always 0 */
3763
3764                 if (hsotg->params.dma_desc_fs_enable) {
3765                         /*
3766                          * Enable descriptor DMA only if a full speed
3767                          * device is connected.
3768                          */
3769                         if (hsotg->new_connection &&
3770                             ((port_status &
3771                               (USB_PORT_STAT_CONNECTION |
3772                                USB_PORT_STAT_HIGH_SPEED |
3773                                USB_PORT_STAT_LOW_SPEED)) ==
3774                                USB_PORT_STAT_CONNECTION)) {
3775                                 u32 hcfg;
3776
3777                                 dev_info(hsotg->dev, "Enabling descriptor DMA mode\n");
3778                                 hsotg->params.dma_desc_enable = true;
3779                                 hcfg = dwc2_readl(hsotg->regs + HCFG);
3780                                 hcfg |= HCFG_DESCDMA;
3781                                 dwc2_writel(hcfg, hsotg->regs + HCFG);
3782                                 hsotg->new_connection = false;
3783                         }
3784                 }
3785
3786                 dev_vdbg(hsotg->dev, "port_status=%08x\n", port_status);
3787                 *(__le32 *)buf = cpu_to_le32(port_status);
3788                 break;
3789
3790         case SetHubFeature:
3791                 dev_dbg(hsotg->dev, "SetHubFeature\n");
3792                 /* No HUB features supported */
3793                 break;
3794
3795         case SetPortFeature:
3796                 dev_dbg(hsotg->dev, "SetPortFeature\n");
3797                 if (wvalue != USB_PORT_FEAT_TEST && (!windex || windex > 1))
3798                         goto error;
3799
3800                 if (!hsotg->flags.b.port_connect_status) {
3801                         /*
3802                          * The port is disconnected, which means the core is
3803                          * either in device mode or it soon will be. Just
3804                          * return without doing anything since the port
3805                          * register can't be written if the core is in device
3806                          * mode.
3807                          */
3808                         break;
3809                 }
3810
3811                 switch (wvalue) {
3812                 case USB_PORT_FEAT_SUSPEND:
3813                         dev_dbg(hsotg->dev,
3814                                 "SetPortFeature - USB_PORT_FEAT_SUSPEND\n");
3815                         if (windex != hsotg->otg_port)
3816                                 goto error;
3817                         if (hsotg->params.power_down == 2)
3818                                 dwc2_enter_hibernation(hsotg, 1);
3819                         else
3820                                 dwc2_port_suspend(hsotg, windex);
3821                         break;
3822
3823                 case USB_PORT_FEAT_POWER:
3824                         dev_dbg(hsotg->dev,
3825                                 "SetPortFeature - USB_PORT_FEAT_POWER\n");
3826                         hprt0 = dwc2_read_hprt0(hsotg);
3827                         hprt0 |= HPRT0_PWR;
3828                         dwc2_writel(hprt0, hsotg->regs + HPRT0);
3829                         break;
3830
3831                 case USB_PORT_FEAT_RESET:
3832                         if (hsotg->params.power_down == 2 &&
3833                             hsotg->hibernated)
3834                                 dwc2_exit_hibernation(hsotg, 0, 1, 1);
3835                         hprt0 = dwc2_read_hprt0(hsotg);
3836                         dev_dbg(hsotg->dev,
3837                                 "SetPortFeature - USB_PORT_FEAT_RESET\n");
3838                         pcgctl = dwc2_readl(hsotg->regs + PCGCTL);
3839                         pcgctl &= ~(PCGCTL_ENBL_SLEEP_GATING | PCGCTL_STOPPCLK);
3840                         dwc2_writel(pcgctl, hsotg->regs + PCGCTL);
3841                         /* ??? Original driver does this */
3842                         dwc2_writel(0, hsotg->regs + PCGCTL);
3843
3844                         hprt0 = dwc2_read_hprt0(hsotg);
3845                         /* Clear suspend bit if resetting from suspend state */
3846                         hprt0 &= ~HPRT0_SUSP;
3847
3848                         /*
3849                          * When B-Host the Port reset bit is set in the Start
3850                          * HCD Callback function, so that the reset is started
3851                          * within 1ms of the HNP success interrupt
3852                          */
3853                         if (!dwc2_hcd_is_b_host(hsotg)) {
3854                                 hprt0 |= HPRT0_PWR | HPRT0_RST;
3855                                 dev_dbg(hsotg->dev,
3856                                         "In host mode, hprt0=%08x\n", hprt0);
3857                                 dwc2_writel(hprt0, hsotg->regs + HPRT0);
3858                         }
3859
3860                         /* Clear reset bit in 10ms (FS/LS) or 50ms (HS) */
3861                         msleep(50);
3862                         hprt0 &= ~HPRT0_RST;
3863                         dwc2_writel(hprt0, hsotg->regs + HPRT0);
3864                         hsotg->lx_state = DWC2_L0; /* Now back to On state */
3865                         break;
3866
3867                 case USB_PORT_FEAT_INDICATOR:
3868                         dev_dbg(hsotg->dev,
3869                                 "SetPortFeature - USB_PORT_FEAT_INDICATOR\n");
3870                         /* Not supported */
3871                         break;
3872
3873                 case USB_PORT_FEAT_TEST:
3874                         hprt0 = dwc2_read_hprt0(hsotg);
3875                         dev_dbg(hsotg->dev,
3876                                 "SetPortFeature - USB_PORT_FEAT_TEST\n");
3877                         hprt0 &= ~HPRT0_TSTCTL_MASK;
3878                         hprt0 |= (windex >> 8) << HPRT0_TSTCTL_SHIFT;
3879                         dwc2_writel(hprt0, hsotg->regs + HPRT0);
3880                         break;
3881
3882                 default:
3883                         retval = -EINVAL;
3884                         dev_err(hsotg->dev,
3885                                 "SetPortFeature %1xh unknown or unsupported\n",
3886                                 wvalue);
3887                         break;
3888                 }
3889                 break;
3890
3891         default:
3892 error:
3893                 retval = -EINVAL;
3894                 dev_dbg(hsotg->dev,
3895                         "Unknown hub control request: %1xh wIndex: %1xh wValue: %1xh\n",
3896                         typereq, windex, wvalue);
3897                 break;
3898         }
3899
3900         return retval;
3901 }
3902
3903 static int dwc2_hcd_is_status_changed(struct dwc2_hsotg *hsotg, int port)
3904 {
3905         int retval;
3906
3907         if (port != 1)
3908                 return -EINVAL;
3909
3910         retval = (hsotg->flags.b.port_connect_status_change ||
3911                   hsotg->flags.b.port_reset_change ||
3912                   hsotg->flags.b.port_enable_change ||
3913                   hsotg->flags.b.port_suspend_change ||
3914                   hsotg->flags.b.port_over_current_change);
3915
3916         if (retval) {
3917                 dev_dbg(hsotg->dev,
3918                         "DWC OTG HCD HUB STATUS DATA: Root port status changed\n");
3919                 dev_dbg(hsotg->dev, "  port_connect_status_change: %d\n",
3920                         hsotg->flags.b.port_connect_status_change);
3921                 dev_dbg(hsotg->dev, "  port_reset_change: %d\n",
3922                         hsotg->flags.b.port_reset_change);
3923                 dev_dbg(hsotg->dev, "  port_enable_change: %d\n",
3924                         hsotg->flags.b.port_enable_change);
3925                 dev_dbg(hsotg->dev, "  port_suspend_change: %d\n",
3926                         hsotg->flags.b.port_suspend_change);
3927                 dev_dbg(hsotg->dev, "  port_over_current_change: %d\n",
3928                         hsotg->flags.b.port_over_current_change);
3929         }
3930
3931         return retval;
3932 }
3933
3934 int dwc2_hcd_get_frame_number(struct dwc2_hsotg *hsotg)
3935 {
3936         u32 hfnum = dwc2_readl(hsotg->regs + HFNUM);
3937
3938 #ifdef DWC2_DEBUG_SOF
3939         dev_vdbg(hsotg->dev, "DWC OTG HCD GET FRAME NUMBER %d\n",
3940                  (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT);
3941 #endif
3942         return (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
3943 }
3944
3945 int dwc2_hcd_get_future_frame_number(struct dwc2_hsotg *hsotg, int us)
3946 {
3947         u32 hprt = dwc2_readl(hsotg->regs + HPRT0);
3948         u32 hfir = dwc2_readl(hsotg->regs + HFIR);
3949         u32 hfnum = dwc2_readl(hsotg->regs + HFNUM);
3950         unsigned int us_per_frame;
3951         unsigned int frame_number;
3952         unsigned int remaining;
3953         unsigned int interval;
3954         unsigned int phy_clks;
3955
3956         /* High speed has 125 us per (micro) frame; others are 1 ms per */
3957         us_per_frame = (hprt & HPRT0_SPD_MASK) ? 1000 : 125;
3958
3959         /* Extract fields */
3960         frame_number = (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
3961         remaining = (hfnum & HFNUM_FRREM_MASK) >> HFNUM_FRREM_SHIFT;
3962         interval = (hfir & HFIR_FRINT_MASK) >> HFIR_FRINT_SHIFT;
3963
3964         /*
3965          * Number of phy clocks since the last tick of the frame number after
3966          * "us" has passed.
3967          */
3968         phy_clks = (interval - remaining) +
3969                    DIV_ROUND_UP(interval * us, us_per_frame);
3970
3971         return dwc2_frame_num_inc(frame_number, phy_clks / interval);
3972 }
3973
3974 int dwc2_hcd_is_b_host(struct dwc2_hsotg *hsotg)
3975 {
3976         return hsotg->op_state == OTG_STATE_B_HOST;
3977 }
3978
3979 static struct dwc2_hcd_urb *dwc2_hcd_urb_alloc(struct dwc2_hsotg *hsotg,
3980                                                int iso_desc_count,
3981                                                gfp_t mem_flags)
3982 {
3983         struct dwc2_hcd_urb *urb;
3984         u32 size = sizeof(*urb) + iso_desc_count *
3985                    sizeof(struct dwc2_hcd_iso_packet_desc);
3986
3987         urb = kzalloc(size, mem_flags);
3988         if (urb)
3989                 urb->packet_count = iso_desc_count;
3990         return urb;
3991 }
3992
3993 static void dwc2_hcd_urb_set_pipeinfo(struct dwc2_hsotg *hsotg,
3994                                       struct dwc2_hcd_urb *urb, u8 dev_addr,
3995                                       u8 ep_num, u8 ep_type, u8 ep_dir, u16 mps)
3996 {
3997         if (dbg_perio() ||
3998             ep_type == USB_ENDPOINT_XFER_BULK ||
3999             ep_type == USB_ENDPOINT_XFER_CONTROL)
4000                 dev_vdbg(hsotg->dev,
4001                          "addr=%d, ep_num=%d, ep_dir=%1x, ep_type=%1x, mps=%d\n",
4002                          dev_addr, ep_num, ep_dir, ep_type, mps);
4003         urb->pipe_info.dev_addr = dev_addr;
4004         urb->pipe_info.ep_num = ep_num;
4005         urb->pipe_info.pipe_type = ep_type;
4006         urb->pipe_info.pipe_dir = ep_dir;
4007         urb->pipe_info.mps = mps;
4008 }
4009
4010 /*
4011  * NOTE: This function will be removed once the peripheral controller code
4012  * is integrated and the driver is stable
4013  */
4014 void dwc2_hcd_dump_state(struct dwc2_hsotg *hsotg)
4015 {
4016 #ifdef DEBUG
4017         struct dwc2_host_chan *chan;
4018         struct dwc2_hcd_urb *urb;
4019         struct dwc2_qtd *qtd;
4020         int num_channels;
4021         u32 np_tx_status;
4022         u32 p_tx_status;
4023         int i;
4024
4025         num_channels = hsotg->params.host_channels;
4026         dev_dbg(hsotg->dev, "\n");
4027         dev_dbg(hsotg->dev,
4028                 "************************************************************\n");
4029         dev_dbg(hsotg->dev, "HCD State:\n");
4030         dev_dbg(hsotg->dev, "  Num channels: %d\n", num_channels);
4031
4032         for (i = 0; i < num_channels; i++) {
4033                 chan = hsotg->hc_ptr_array[i];
4034                 dev_dbg(hsotg->dev, "  Channel %d:\n", i);
4035                 dev_dbg(hsotg->dev,
4036                         "    dev_addr: %d, ep_num: %d, ep_is_in: %d\n",
4037                         chan->dev_addr, chan->ep_num, chan->ep_is_in);
4038                 dev_dbg(hsotg->dev, "    speed: %d\n", chan->speed);
4039                 dev_dbg(hsotg->dev, "    ep_type: %d\n", chan->ep_type);
4040                 dev_dbg(hsotg->dev, "    max_packet: %d\n", chan->max_packet);
4041                 dev_dbg(hsotg->dev, "    data_pid_start: %d\n",
4042                         chan->data_pid_start);
4043                 dev_dbg(hsotg->dev, "    multi_count: %d\n", chan->multi_count);
4044                 dev_dbg(hsotg->dev, "    xfer_started: %d\n",
4045                         chan->xfer_started);
4046                 dev_dbg(hsotg->dev, "    xfer_buf: %p\n", chan->xfer_buf);
4047                 dev_dbg(hsotg->dev, "    xfer_dma: %08lx\n",
4048                         (unsigned long)chan->xfer_dma);
4049                 dev_dbg(hsotg->dev, "    xfer_len: %d\n", chan->xfer_len);
4050                 dev_dbg(hsotg->dev, "    xfer_count: %d\n", chan->xfer_count);
4051                 dev_dbg(hsotg->dev, "    halt_on_queue: %d\n",
4052                         chan->halt_on_queue);
4053                 dev_dbg(hsotg->dev, "    halt_pending: %d\n",
4054                         chan->halt_pending);
4055                 dev_dbg(hsotg->dev, "    halt_status: %d\n", chan->halt_status);
4056                 dev_dbg(hsotg->dev, "    do_split: %d\n", chan->do_split);
4057                 dev_dbg(hsotg->dev, "    complete_split: %d\n",
4058                         chan->complete_split);
4059                 dev_dbg(hsotg->dev, "    hub_addr: %d\n", chan->hub_addr);
4060                 dev_dbg(hsotg->dev, "    hub_port: %d\n", chan->hub_port);
4061                 dev_dbg(hsotg->dev, "    xact_pos: %d\n", chan->xact_pos);
4062                 dev_dbg(hsotg->dev, "    requests: %d\n", chan->requests);
4063                 dev_dbg(hsotg->dev, "    qh: %p\n", chan->qh);
4064
4065                 if (chan->xfer_started) {
4066                         u32 hfnum, hcchar, hctsiz, hcint, hcintmsk;
4067
4068                         hfnum = dwc2_readl(hsotg->regs + HFNUM);
4069                         hcchar = dwc2_readl(hsotg->regs + HCCHAR(i));
4070                         hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(i));
4071                         hcint = dwc2_readl(hsotg->regs + HCINT(i));
4072                         hcintmsk = dwc2_readl(hsotg->regs + HCINTMSK(i));
4073                         dev_dbg(hsotg->dev, "    hfnum: 0x%08x\n", hfnum);
4074                         dev_dbg(hsotg->dev, "    hcchar: 0x%08x\n", hcchar);
4075                         dev_dbg(hsotg->dev, "    hctsiz: 0x%08x\n", hctsiz);
4076                         dev_dbg(hsotg->dev, "    hcint: 0x%08x\n", hcint);
4077                         dev_dbg(hsotg->dev, "    hcintmsk: 0x%08x\n", hcintmsk);
4078                 }
4079
4080                 if (!(chan->xfer_started && chan->qh))
4081                         continue;
4082
4083                 list_for_each_entry(qtd, &chan->qh->qtd_list, qtd_list_entry) {
4084                         if (!qtd->in_process)
4085                                 break;
4086                         urb = qtd->urb;
4087                         dev_dbg(hsotg->dev, "    URB Info:\n");
4088                         dev_dbg(hsotg->dev, "      qtd: %p, urb: %p\n",
4089                                 qtd, urb);
4090                         if (urb) {
4091                                 dev_dbg(hsotg->dev,
4092                                         "      Dev: %d, EP: %d %s\n",
4093                                         dwc2_hcd_get_dev_addr(&urb->pipe_info),
4094                                         dwc2_hcd_get_ep_num(&urb->pipe_info),
4095                                         dwc2_hcd_is_pipe_in(&urb->pipe_info) ?
4096                                         "IN" : "OUT");
4097                                 dev_dbg(hsotg->dev,
4098                                         "      Max packet size: %d\n",
4099                                         dwc2_hcd_get_mps(&urb->pipe_info));
4100                                 dev_dbg(hsotg->dev,
4101                                         "      transfer_buffer: %p\n",
4102                                         urb->buf);
4103                                 dev_dbg(hsotg->dev,
4104                                         "      transfer_dma: %08lx\n",
4105                                         (unsigned long)urb->dma);
4106                                 dev_dbg(hsotg->dev,
4107                                         "      transfer_buffer_length: %d\n",
4108                                         urb->length);
4109                                 dev_dbg(hsotg->dev, "      actual_length: %d\n",
4110                                         urb->actual_length);
4111                         }
4112                 }
4113         }
4114
4115         dev_dbg(hsotg->dev, "  non_periodic_channels: %d\n",
4116                 hsotg->non_periodic_channels);
4117         dev_dbg(hsotg->dev, "  periodic_channels: %d\n",
4118                 hsotg->periodic_channels);
4119         dev_dbg(hsotg->dev, "  periodic_usecs: %d\n", hsotg->periodic_usecs);
4120         np_tx_status = dwc2_readl(hsotg->regs + GNPTXSTS);
4121         dev_dbg(hsotg->dev, "  NP Tx Req Queue Space Avail: %d\n",
4122                 (np_tx_status & TXSTS_QSPCAVAIL_MASK) >> TXSTS_QSPCAVAIL_SHIFT);
4123         dev_dbg(hsotg->dev, "  NP Tx FIFO Space Avail: %d\n",
4124                 (np_tx_status & TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT);
4125         p_tx_status = dwc2_readl(hsotg->regs + HPTXSTS);
4126         dev_dbg(hsotg->dev, "  P Tx Req Queue Space Avail: %d\n",
4127                 (p_tx_status & TXSTS_QSPCAVAIL_MASK) >> TXSTS_QSPCAVAIL_SHIFT);
4128         dev_dbg(hsotg->dev, "  P Tx FIFO Space Avail: %d\n",
4129                 (p_tx_status & TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT);
4130         dwc2_dump_global_registers(hsotg);
4131         dwc2_dump_host_registers(hsotg);
4132         dev_dbg(hsotg->dev,
4133                 "************************************************************\n");
4134         dev_dbg(hsotg->dev, "\n");
4135 #endif
4136 }
4137
4138 struct wrapper_priv_data {
4139         struct dwc2_hsotg *hsotg;
4140 };
4141
4142 /* Gets the dwc2_hsotg from a usb_hcd */
4143 static struct dwc2_hsotg *dwc2_hcd_to_hsotg(struct usb_hcd *hcd)
4144 {
4145         struct wrapper_priv_data *p;
4146
4147         p = (struct wrapper_priv_data *)&hcd->hcd_priv;
4148         return p->hsotg;
4149 }
4150
4151 /**
4152  * dwc2_host_get_tt_info() - Get the dwc2_tt associated with context
4153  *
4154  * This will get the dwc2_tt structure (and ttport) associated with the given
4155  * context (which is really just a struct urb pointer).
4156  *
4157  * The first time this is called for a given TT we allocate memory for our
4158  * structure.  When everyone is done and has called dwc2_host_put_tt_info()
4159  * then the refcount for the structure will go to 0 and we'll free it.
4160  *
4161  * @hsotg:     The HCD state structure for the DWC OTG controller.
4162  * @context:   The priv pointer from a struct dwc2_hcd_urb.
4163  * @mem_flags: Flags for allocating memory.
4164  * @ttport:    We'll return this device's port number here.  That's used to
4165  *             reference into the bitmap if we're on a multi_tt hub.
4166  *
4167  * Return: a pointer to a struct dwc2_tt.  Don't forget to call
4168  *         dwc2_host_put_tt_info()!  Returns NULL upon memory alloc failure.
4169  */
4170
4171 struct dwc2_tt *dwc2_host_get_tt_info(struct dwc2_hsotg *hsotg, void *context,
4172                                       gfp_t mem_flags, int *ttport)
4173 {
4174         struct urb *urb = context;
4175         struct dwc2_tt *dwc_tt = NULL;
4176
4177         if (urb->dev->tt) {
4178                 *ttport = urb->dev->ttport;
4179
4180                 dwc_tt = urb->dev->tt->hcpriv;
4181                 if (!dwc_tt) {
4182                         size_t bitmap_size;
4183
4184                         /*
4185                          * For single_tt we need one schedule.  For multi_tt
4186                          * we need one per port.
4187                          */
4188                         bitmap_size = DWC2_ELEMENTS_PER_LS_BITMAP *
4189                                       sizeof(dwc_tt->periodic_bitmaps[0]);
4190                         if (urb->dev->tt->multi)
4191                                 bitmap_size *= urb->dev->tt->hub->maxchild;
4192
4193                         dwc_tt = kzalloc(sizeof(*dwc_tt) + bitmap_size,
4194                                          mem_flags);
4195                         if (!dwc_tt)
4196                                 return NULL;
4197
4198                         dwc_tt->usb_tt = urb->dev->tt;
4199                         dwc_tt->usb_tt->hcpriv = dwc_tt;
4200                 }
4201
4202                 dwc_tt->refcount++;
4203         }
4204
4205         return dwc_tt;
4206 }
4207
4208 /**
4209  * dwc2_host_put_tt_info() - Put the dwc2_tt from dwc2_host_get_tt_info()
4210  *
4211  * Frees resources allocated by dwc2_host_get_tt_info() if all current holders
4212  * of the structure are done.
4213  *
4214  * It's OK to call this with NULL.
4215  *
4216  * @hsotg:     The HCD state structure for the DWC OTG controller.
4217  * @dwc_tt:    The pointer returned by dwc2_host_get_tt_info.
4218  */
4219 void dwc2_host_put_tt_info(struct dwc2_hsotg *hsotg, struct dwc2_tt *dwc_tt)
4220 {
4221         /* Model kfree and make put of NULL a no-op */
4222         if (!dwc_tt)
4223                 return;
4224
4225         WARN_ON(dwc_tt->refcount < 1);
4226
4227         dwc_tt->refcount--;
4228         if (!dwc_tt->refcount) {
4229                 dwc_tt->usb_tt->hcpriv = NULL;
4230                 kfree(dwc_tt);
4231         }
4232 }
4233
4234 int dwc2_host_get_speed(struct dwc2_hsotg *hsotg, void *context)
4235 {
4236         struct urb *urb = context;
4237
4238         return urb->dev->speed;
4239 }
4240
4241 static void dwc2_allocate_bus_bandwidth(struct usb_hcd *hcd, u16 bw,
4242                                         struct urb *urb)
4243 {
4244         struct usb_bus *bus = hcd_to_bus(hcd);
4245
4246         if (urb->interval)
4247                 bus->bandwidth_allocated += bw / urb->interval;
4248         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
4249                 bus->bandwidth_isoc_reqs++;
4250         else
4251                 bus->bandwidth_int_reqs++;
4252 }
4253
4254 static void dwc2_free_bus_bandwidth(struct usb_hcd *hcd, u16 bw,
4255                                     struct urb *urb)
4256 {
4257         struct usb_bus *bus = hcd_to_bus(hcd);
4258
4259         if (urb->interval)
4260                 bus->bandwidth_allocated -= bw / urb->interval;
4261         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
4262                 bus->bandwidth_isoc_reqs--;
4263         else
4264                 bus->bandwidth_int_reqs--;
4265 }
4266
4267 /*
4268  * Sets the final status of an URB and returns it to the upper layer. Any
4269  * required cleanup of the URB is performed.
4270  *
4271  * Must be called with interrupt disabled and spinlock held
4272  */
4273 void dwc2_host_complete(struct dwc2_hsotg *hsotg, struct dwc2_qtd *qtd,
4274                         int status)
4275 {
4276         struct urb *urb;
4277         int i;
4278
4279         if (!qtd) {
4280                 dev_dbg(hsotg->dev, "## %s: qtd is NULL ##\n", __func__);
4281                 return;
4282         }
4283
4284         if (!qtd->urb) {
4285                 dev_dbg(hsotg->dev, "## %s: qtd->urb is NULL ##\n", __func__);
4286                 return;
4287         }
4288
4289         urb = qtd->urb->priv;
4290         if (!urb) {
4291                 dev_dbg(hsotg->dev, "## %s: urb->priv is NULL ##\n", __func__);
4292                 return;
4293         }
4294
4295         urb->actual_length = dwc2_hcd_urb_get_actual_length(qtd->urb);
4296
4297         if (dbg_urb(urb))
4298                 dev_vdbg(hsotg->dev,
4299                          "%s: urb %p device %d ep %d-%s status %d actual %d\n",
4300                          __func__, urb, usb_pipedevice(urb->pipe),
4301                          usb_pipeendpoint(urb->pipe),
4302                          usb_pipein(urb->pipe) ? "IN" : "OUT", status,
4303                          urb->actual_length);
4304
4305         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
4306                 urb->error_count = dwc2_hcd_urb_get_error_count(qtd->urb);
4307                 for (i = 0; i < urb->number_of_packets; ++i) {
4308                         urb->iso_frame_desc[i].actual_length =
4309                                 dwc2_hcd_urb_get_iso_desc_actual_length(
4310                                                 qtd->urb, i);
4311                         urb->iso_frame_desc[i].status =
4312                                 dwc2_hcd_urb_get_iso_desc_status(qtd->urb, i);
4313                 }
4314         }
4315
4316         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS && dbg_perio()) {
4317                 for (i = 0; i < urb->number_of_packets; i++)
4318                         dev_vdbg(hsotg->dev, " ISO Desc %d status %d\n",
4319                                  i, urb->iso_frame_desc[i].status);
4320         }
4321
4322         urb->status = status;
4323         if (!status) {
4324                 if ((urb->transfer_flags & URB_SHORT_NOT_OK) &&
4325                     urb->actual_length < urb->transfer_buffer_length)
4326                         urb->status = -EREMOTEIO;
4327         }
4328
4329         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS ||
4330             usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
4331                 struct usb_host_endpoint *ep = urb->ep;
4332
4333                 if (ep)
4334                         dwc2_free_bus_bandwidth(dwc2_hsotg_to_hcd(hsotg),
4335                                         dwc2_hcd_get_ep_bandwidth(hsotg, ep),
4336                                         urb);
4337         }
4338
4339         usb_hcd_unlink_urb_from_ep(dwc2_hsotg_to_hcd(hsotg), urb);
4340         urb->hcpriv = NULL;
4341         kfree(qtd->urb);
4342         qtd->urb = NULL;
4343
4344         usb_hcd_giveback_urb(dwc2_hsotg_to_hcd(hsotg), urb, status);
4345 }
4346
4347 /*
4348  * Work queue function for starting the HCD when A-Cable is connected
4349  */
4350 static void dwc2_hcd_start_func(struct work_struct *work)
4351 {
4352         struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
4353                                                 start_work.work);
4354
4355         dev_dbg(hsotg->dev, "%s() %p\n", __func__, hsotg);
4356         dwc2_host_start(hsotg);
4357 }
4358
4359 /*
4360  * Reset work queue function
4361  */
4362 static void dwc2_hcd_reset_func(struct work_struct *work)
4363 {
4364         struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
4365                                                 reset_work.work);
4366         unsigned long flags;
4367         u32 hprt0;
4368
4369         dev_dbg(hsotg->dev, "USB RESET function called\n");
4370
4371         spin_lock_irqsave(&hsotg->lock, flags);
4372
4373         hprt0 = dwc2_read_hprt0(hsotg);
4374         hprt0 &= ~HPRT0_RST;
4375         dwc2_writel(hprt0, hsotg->regs + HPRT0);
4376         hsotg->flags.b.port_reset_change = 1;
4377
4378         spin_unlock_irqrestore(&hsotg->lock, flags);
4379 }
4380
4381 /*
4382  * =========================================================================
4383  *  Linux HC Driver Functions
4384  * =========================================================================
4385  */
4386
4387 /*
4388  * Initializes the DWC_otg controller and its root hub and prepares it for host
4389  * mode operation. Activates the root port. Returns 0 on success and a negative
4390  * error code on failure.
4391  */
4392 static int _dwc2_hcd_start(struct usb_hcd *hcd)
4393 {
4394         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4395         struct usb_bus *bus = hcd_to_bus(hcd);
4396         unsigned long flags;
4397
4398         dev_dbg(hsotg->dev, "DWC OTG HCD START\n");
4399
4400         spin_lock_irqsave(&hsotg->lock, flags);
4401         hsotg->lx_state = DWC2_L0;
4402         hcd->state = HC_STATE_RUNNING;
4403         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
4404
4405         if (dwc2_is_device_mode(hsotg)) {
4406                 spin_unlock_irqrestore(&hsotg->lock, flags);
4407                 return 0;       /* why 0 ?? */
4408         }
4409
4410         dwc2_hcd_reinit(hsotg);
4411
4412         /* Initialize and connect root hub if one is not already attached */
4413         if (bus->root_hub) {
4414                 dev_dbg(hsotg->dev, "DWC OTG HCD Has Root Hub\n");
4415                 /* Inform the HUB driver to resume */
4416                 usb_hcd_resume_root_hub(hcd);
4417         }
4418
4419         spin_unlock_irqrestore(&hsotg->lock, flags);
4420
4421         return dwc2_vbus_supply_init(hsotg);
4422 }
4423
4424 /*
4425  * Halts the DWC_otg host mode operations in a clean manner. USB transfers are
4426  * stopped.
4427  */
4428 static void _dwc2_hcd_stop(struct usb_hcd *hcd)
4429 {
4430         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4431         unsigned long flags;
4432
4433         /* Turn off all host-specific interrupts */
4434         dwc2_disable_host_interrupts(hsotg);
4435
4436         /* Wait for interrupt processing to finish */
4437         synchronize_irq(hcd->irq);
4438
4439         spin_lock_irqsave(&hsotg->lock, flags);
4440         /* Ensure hcd is disconnected */
4441         dwc2_hcd_disconnect(hsotg, true);
4442         dwc2_hcd_stop(hsotg);
4443         hsotg->lx_state = DWC2_L3;
4444         hcd->state = HC_STATE_HALT;
4445         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
4446         spin_unlock_irqrestore(&hsotg->lock, flags);
4447
4448         dwc2_vbus_supply_exit(hsotg);
4449
4450         usleep_range(1000, 3000);
4451 }
4452
4453 static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
4454 {
4455         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4456         unsigned long flags;
4457         int ret = 0;
4458         u32 hprt0;
4459
4460         spin_lock_irqsave(&hsotg->lock, flags);
4461
4462         if (dwc2_is_device_mode(hsotg))
4463                 goto unlock;
4464
4465         if (hsotg->lx_state != DWC2_L0)
4466                 goto unlock;
4467
4468         if (!HCD_HW_ACCESSIBLE(hcd))
4469                 goto unlock;
4470
4471         if (hsotg->op_state == OTG_STATE_B_PERIPHERAL)
4472                 goto unlock;
4473
4474         if (hsotg->params.power_down != DWC2_POWER_DOWN_PARAM_PARTIAL)
4475                 goto skip_power_saving;
4476
4477         /*
4478          * Drive USB suspend and disable port Power
4479          * if usb bus is not suspended.
4480          */
4481         if (!hsotg->bus_suspended) {
4482                 hprt0 = dwc2_read_hprt0(hsotg);
4483                 hprt0 |= HPRT0_SUSP;
4484                 hprt0 &= ~HPRT0_PWR;
4485                 dwc2_writel(hprt0, hsotg->regs + HPRT0);
4486                 dwc2_vbus_supply_exit(hsotg);
4487         }
4488
4489         /* Enter partial_power_down */
4490         ret = dwc2_enter_partial_power_down(hsotg);
4491         if (ret) {
4492                 if (ret != -ENOTSUPP)
4493                         dev_err(hsotg->dev,
4494                                 "enter partial_power_down failed\n");
4495                 goto skip_power_saving;
4496         }
4497
4498         /* Ask phy to be suspended */
4499         if (!IS_ERR_OR_NULL(hsotg->uphy)) {
4500                 spin_unlock_irqrestore(&hsotg->lock, flags);
4501                 usb_phy_set_suspend(hsotg->uphy, true);
4502                 spin_lock_irqsave(&hsotg->lock, flags);
4503         }
4504
4505         /* After entering partial_power_down, hardware is no more accessible */
4506         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
4507
4508 skip_power_saving:
4509         hsotg->lx_state = DWC2_L2;
4510 unlock:
4511         spin_unlock_irqrestore(&hsotg->lock, flags);
4512
4513         return ret;
4514 }
4515
4516 static int _dwc2_hcd_resume(struct usb_hcd *hcd)
4517 {
4518         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4519         unsigned long flags;
4520         int ret = 0;
4521
4522         spin_lock_irqsave(&hsotg->lock, flags);
4523
4524         if (dwc2_is_device_mode(hsotg))
4525                 goto unlock;
4526
4527         if (hsotg->lx_state != DWC2_L2)
4528                 goto unlock;
4529
4530         if (hsotg->params.power_down != DWC2_POWER_DOWN_PARAM_PARTIAL) {
4531                 hsotg->lx_state = DWC2_L0;
4532                 goto unlock;
4533         }
4534
4535         /*
4536          * Set HW accessible bit before powering on the controller
4537          * since an interrupt may rise.
4538          */
4539         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
4540
4541         /*
4542          * Enable power if not already done.
4543          * This must not be spinlocked since duration
4544          * of this call is unknown.
4545          */
4546         if (!IS_ERR_OR_NULL(hsotg->uphy)) {
4547                 spin_unlock_irqrestore(&hsotg->lock, flags);
4548                 usb_phy_set_suspend(hsotg->uphy, false);
4549                 spin_lock_irqsave(&hsotg->lock, flags);
4550         }
4551
4552         /* Exit partial_power_down */
4553         ret = dwc2_exit_partial_power_down(hsotg, true);
4554         if (ret && (ret != -ENOTSUPP))
4555                 dev_err(hsotg->dev, "exit partial_power_down failed\n");
4556
4557         hsotg->lx_state = DWC2_L0;
4558
4559         spin_unlock_irqrestore(&hsotg->lock, flags);
4560
4561         if (hsotg->bus_suspended) {
4562                 spin_lock_irqsave(&hsotg->lock, flags);
4563                 hsotg->flags.b.port_suspend_change = 1;
4564                 spin_unlock_irqrestore(&hsotg->lock, flags);
4565                 dwc2_port_resume(hsotg);
4566         } else {
4567                 dwc2_vbus_supply_init(hsotg);
4568
4569                 /* Wait for controller to correctly update D+/D- level */
4570                 usleep_range(3000, 5000);
4571
4572                 /*
4573                  * Clear Port Enable and Port Status changes.
4574                  * Enable Port Power.
4575                  */
4576                 dwc2_writel(HPRT0_PWR | HPRT0_CONNDET |
4577                                 HPRT0_ENACHG, hsotg->regs + HPRT0);
4578                 /* Wait for controller to detect Port Connect */
4579                 usleep_range(5000, 7000);
4580         }
4581
4582         return ret;
4583 unlock:
4584         spin_unlock_irqrestore(&hsotg->lock, flags);
4585
4586         return ret;
4587 }
4588
4589 /* Returns the current frame number */
4590 static int _dwc2_hcd_get_frame_number(struct usb_hcd *hcd)
4591 {
4592         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4593
4594         return dwc2_hcd_get_frame_number(hsotg);
4595 }
4596
4597 static void dwc2_dump_urb_info(struct usb_hcd *hcd, struct urb *urb,
4598                                char *fn_name)
4599 {
4600 #ifdef VERBOSE_DEBUG
4601         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4602         char *pipetype = NULL;
4603         char *speed = NULL;
4604
4605         dev_vdbg(hsotg->dev, "%s, urb %p\n", fn_name, urb);
4606         dev_vdbg(hsotg->dev, "  Device address: %d\n",
4607                  usb_pipedevice(urb->pipe));
4608         dev_vdbg(hsotg->dev, "  Endpoint: %d, %s\n",
4609                  usb_pipeendpoint(urb->pipe),
4610                  usb_pipein(urb->pipe) ? "IN" : "OUT");
4611
4612         switch (usb_pipetype(urb->pipe)) {
4613         case PIPE_CONTROL:
4614                 pipetype = "CONTROL";
4615                 break;
4616         case PIPE_BULK:
4617                 pipetype = "BULK";
4618                 break;
4619         case PIPE_INTERRUPT:
4620                 pipetype = "INTERRUPT";
4621                 break;
4622         case PIPE_ISOCHRONOUS:
4623                 pipetype = "ISOCHRONOUS";
4624                 break;
4625         }
4626
4627         dev_vdbg(hsotg->dev, "  Endpoint type: %s %s (%s)\n", pipetype,
4628                  usb_urb_dir_in(urb) ? "IN" : "OUT", usb_pipein(urb->pipe) ?
4629                  "IN" : "OUT");
4630
4631         switch (urb->dev->speed) {
4632         case USB_SPEED_HIGH:
4633                 speed = "HIGH";
4634                 break;
4635         case USB_SPEED_FULL:
4636                 speed = "FULL";
4637                 break;
4638         case USB_SPEED_LOW:
4639                 speed = "LOW";
4640                 break;
4641         default:
4642                 speed = "UNKNOWN";
4643                 break;
4644         }
4645
4646         dev_vdbg(hsotg->dev, "  Speed: %s\n", speed);
4647         dev_vdbg(hsotg->dev, "  Max packet size: %d\n",
4648                  usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)));
4649         dev_vdbg(hsotg->dev, "  Data buffer length: %d\n",
4650                  urb->transfer_buffer_length);
4651         dev_vdbg(hsotg->dev, "  Transfer buffer: %p, Transfer DMA: %08lx\n",
4652                  urb->transfer_buffer, (unsigned long)urb->transfer_dma);
4653         dev_vdbg(hsotg->dev, "  Setup buffer: %p, Setup DMA: %08lx\n",
4654                  urb->setup_packet, (unsigned long)urb->setup_dma);
4655         dev_vdbg(hsotg->dev, "  Interval: %d\n", urb->interval);
4656
4657         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
4658                 int i;
4659
4660                 for (i = 0; i < urb->number_of_packets; i++) {
4661                         dev_vdbg(hsotg->dev, "  ISO Desc %d:\n", i);
4662                         dev_vdbg(hsotg->dev, "    offset: %d, length %d\n",
4663                                  urb->iso_frame_desc[i].offset,
4664                                  urb->iso_frame_desc[i].length);
4665                 }
4666         }
4667 #endif
4668 }
4669
4670 /*
4671  * Starts processing a USB transfer request specified by a USB Request Block
4672  * (URB). mem_flags indicates the type of memory allocation to use while
4673  * processing this URB.
4674  */
4675 static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
4676                                  gfp_t mem_flags)
4677 {
4678         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4679         struct usb_host_endpoint *ep = urb->ep;
4680         struct dwc2_hcd_urb *dwc2_urb;
4681         int i;
4682         int retval;
4683         int alloc_bandwidth = 0;
4684         u8 ep_type = 0;
4685         u32 tflags = 0;
4686         void *buf;
4687         unsigned long flags;
4688         struct dwc2_qh *qh;
4689         bool qh_allocated = false;
4690         struct dwc2_qtd *qtd;
4691
4692         if (dbg_urb(urb)) {
4693                 dev_vdbg(hsotg->dev, "DWC OTG HCD URB Enqueue\n");
4694                 dwc2_dump_urb_info(hcd, urb, "urb_enqueue");
4695         }
4696
4697         if (!ep)
4698                 return -EINVAL;
4699
4700         if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS ||
4701             usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
4702                 spin_lock_irqsave(&hsotg->lock, flags);
4703                 if (!dwc2_hcd_is_bandwidth_allocated(hsotg, ep))
4704                         alloc_bandwidth = 1;
4705                 spin_unlock_irqrestore(&hsotg->lock, flags);
4706         }
4707
4708         switch (usb_pipetype(urb->pipe)) {
4709         case PIPE_CONTROL:
4710                 ep_type = USB_ENDPOINT_XFER_CONTROL;
4711                 break;
4712         case PIPE_ISOCHRONOUS:
4713                 ep_type = USB_ENDPOINT_XFER_ISOC;
4714                 break;
4715         case PIPE_BULK:
4716                 ep_type = USB_ENDPOINT_XFER_BULK;
4717                 break;
4718         case PIPE_INTERRUPT:
4719                 ep_type = USB_ENDPOINT_XFER_INT;
4720                 break;
4721         }
4722
4723         dwc2_urb = dwc2_hcd_urb_alloc(hsotg, urb->number_of_packets,
4724                                       mem_flags);
4725         if (!dwc2_urb)
4726                 return -ENOMEM;
4727
4728         dwc2_hcd_urb_set_pipeinfo(hsotg, dwc2_urb, usb_pipedevice(urb->pipe),
4729                                   usb_pipeendpoint(urb->pipe), ep_type,
4730                                   usb_pipein(urb->pipe),
4731                                   usb_maxpacket(urb->dev, urb->pipe,
4732                                                 !(usb_pipein(urb->pipe))));
4733
4734         buf = urb->transfer_buffer;
4735
4736         if (hcd->self.uses_dma) {
4737                 if (!buf && (urb->transfer_dma & 3)) {
4738                         dev_err(hsotg->dev,
4739                                 "%s: unaligned transfer with no transfer_buffer",
4740                                 __func__);
4741                         retval = -EINVAL;
4742                         goto fail0;
4743                 }
4744         }
4745
4746         if (!(urb->transfer_flags & URB_NO_INTERRUPT))
4747                 tflags |= URB_GIVEBACK_ASAP;
4748         if (urb->transfer_flags & URB_ZERO_PACKET)
4749                 tflags |= URB_SEND_ZERO_PACKET;
4750
4751         dwc2_urb->priv = urb;
4752         dwc2_urb->buf = buf;
4753         dwc2_urb->dma = urb->transfer_dma;
4754         dwc2_urb->length = urb->transfer_buffer_length;
4755         dwc2_urb->setup_packet = urb->setup_packet;
4756         dwc2_urb->setup_dma = urb->setup_dma;
4757         dwc2_urb->flags = tflags;
4758         dwc2_urb->interval = urb->interval;
4759         dwc2_urb->status = -EINPROGRESS;
4760
4761         for (i = 0; i < urb->number_of_packets; ++i)
4762                 dwc2_hcd_urb_set_iso_desc_params(dwc2_urb, i,
4763                                                  urb->iso_frame_desc[i].offset,
4764                                                  urb->iso_frame_desc[i].length);
4765
4766         urb->hcpriv = dwc2_urb;
4767         qh = (struct dwc2_qh *)ep->hcpriv;
4768         /* Create QH for the endpoint if it doesn't exist */
4769         if (!qh) {
4770                 qh = dwc2_hcd_qh_create(hsotg, dwc2_urb, mem_flags);
4771                 if (!qh) {
4772                         retval = -ENOMEM;
4773                         goto fail0;
4774                 }
4775                 ep->hcpriv = qh;
4776                 qh_allocated = true;
4777         }
4778
4779         qtd = kzalloc(sizeof(*qtd), mem_flags);
4780         if (!qtd) {
4781                 retval = -ENOMEM;
4782                 goto fail1;
4783         }
4784
4785         spin_lock_irqsave(&hsotg->lock, flags);
4786         retval = usb_hcd_link_urb_to_ep(hcd, urb);
4787         if (retval)
4788                 goto fail2;
4789
4790         retval = dwc2_hcd_urb_enqueue(hsotg, dwc2_urb, qh, qtd);
4791         if (retval)
4792                 goto fail3;
4793
4794         if (alloc_bandwidth) {
4795                 dwc2_allocate_bus_bandwidth(hcd,
4796                                 dwc2_hcd_get_ep_bandwidth(hsotg, ep),
4797                                 urb);
4798         }
4799
4800         spin_unlock_irqrestore(&hsotg->lock, flags);
4801
4802         return 0;
4803
4804 fail3:
4805         dwc2_urb->priv = NULL;
4806         usb_hcd_unlink_urb_from_ep(hcd, urb);
4807         if (qh_allocated && qh->channel && qh->channel->qh == qh)
4808                 qh->channel->qh = NULL;
4809 fail2:
4810         spin_unlock_irqrestore(&hsotg->lock, flags);
4811         urb->hcpriv = NULL;
4812         kfree(qtd);
4813         qtd = NULL;
4814 fail1:
4815         if (qh_allocated) {
4816                 struct dwc2_qtd *qtd2, *qtd2_tmp;
4817
4818                 ep->hcpriv = NULL;
4819                 dwc2_hcd_qh_unlink(hsotg, qh);
4820                 /* Free each QTD in the QH's QTD list */
4821                 list_for_each_entry_safe(qtd2, qtd2_tmp, &qh->qtd_list,
4822                                          qtd_list_entry)
4823                         dwc2_hcd_qtd_unlink_and_free(hsotg, qtd2, qh);
4824                 dwc2_hcd_qh_free(hsotg, qh);
4825         }
4826 fail0:
4827         kfree(dwc2_urb);
4828
4829         return retval;
4830 }
4831
4832 /*
4833  * Aborts/cancels a USB transfer request. Always returns 0 to indicate success.
4834  */
4835 static int _dwc2_hcd_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
4836                                  int status)
4837 {
4838         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4839         int rc;
4840         unsigned long flags;
4841
4842         dev_dbg(hsotg->dev, "DWC OTG HCD URB Dequeue\n");
4843         dwc2_dump_urb_info(hcd, urb, "urb_dequeue");
4844
4845         spin_lock_irqsave(&hsotg->lock, flags);
4846
4847         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
4848         if (rc)
4849                 goto out;
4850
4851         if (!urb->hcpriv) {
4852                 dev_dbg(hsotg->dev, "## urb->hcpriv is NULL ##\n");
4853                 goto out;
4854         }
4855
4856         rc = dwc2_hcd_urb_dequeue(hsotg, urb->hcpriv);
4857
4858         usb_hcd_unlink_urb_from_ep(hcd, urb);
4859
4860         kfree(urb->hcpriv);
4861         urb->hcpriv = NULL;
4862
4863         /* Higher layer software sets URB status */
4864         spin_unlock(&hsotg->lock);
4865         usb_hcd_giveback_urb(hcd, urb, status);
4866         spin_lock(&hsotg->lock);
4867
4868         dev_dbg(hsotg->dev, "Called usb_hcd_giveback_urb()\n");
4869         dev_dbg(hsotg->dev, "  urb->status = %d\n", urb->status);
4870 out:
4871         spin_unlock_irqrestore(&hsotg->lock, flags);
4872
4873         return rc;
4874 }
4875
4876 /*
4877  * Frees resources in the DWC_otg controller related to a given endpoint. Also
4878  * clears state in the HCD related to the endpoint. Any URBs for the endpoint
4879  * must already be dequeued.
4880  */
4881 static void _dwc2_hcd_endpoint_disable(struct usb_hcd *hcd,
4882                                        struct usb_host_endpoint *ep)
4883 {
4884         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4885
4886         dev_dbg(hsotg->dev,
4887                 "DWC OTG HCD EP DISABLE: bEndpointAddress=0x%02x, ep->hcpriv=%p\n",
4888                 ep->desc.bEndpointAddress, ep->hcpriv);
4889         dwc2_hcd_endpoint_disable(hsotg, ep, 250);
4890 }
4891
4892 /*
4893  * Resets endpoint specific parameter values, in current version used to reset
4894  * the data toggle (as a WA). This function can be called from usb_clear_halt
4895  * routine.
4896  */
4897 static void _dwc2_hcd_endpoint_reset(struct usb_hcd *hcd,
4898                                      struct usb_host_endpoint *ep)
4899 {
4900         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4901         unsigned long flags;
4902
4903         dev_dbg(hsotg->dev,
4904                 "DWC OTG HCD EP RESET: bEndpointAddress=0x%02x\n",
4905                 ep->desc.bEndpointAddress);
4906
4907         spin_lock_irqsave(&hsotg->lock, flags);
4908         dwc2_hcd_endpoint_reset(hsotg, ep);
4909         spin_unlock_irqrestore(&hsotg->lock, flags);
4910 }
4911
4912 /*
4913  * Handles host mode interrupts for the DWC_otg controller. Returns IRQ_NONE if
4914  * there was no interrupt to handle. Returns IRQ_HANDLED if there was a valid
4915  * interrupt.
4916  *
4917  * This function is called by the USB core when an interrupt occurs
4918  */
4919 static irqreturn_t _dwc2_hcd_irq(struct usb_hcd *hcd)
4920 {
4921         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4922
4923         return dwc2_handle_hcd_intr(hsotg);
4924 }
4925
4926 /*
4927  * Creates Status Change bitmap for the root hub and root port. The bitmap is
4928  * returned in buf. Bit 0 is the status change indicator for the root hub. Bit 1
4929  * is the status change indicator for the single root port. Returns 1 if either
4930  * change indicator is 1, otherwise returns 0.
4931  */
4932 static int _dwc2_hcd_hub_status_data(struct usb_hcd *hcd, char *buf)
4933 {
4934         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4935
4936         buf[0] = dwc2_hcd_is_status_changed(hsotg, 1) << 1;
4937         return buf[0] != 0;
4938 }
4939
4940 /* Handles hub class-specific requests */
4941 static int _dwc2_hcd_hub_control(struct usb_hcd *hcd, u16 typereq, u16 wvalue,
4942                                  u16 windex, char *buf, u16 wlength)
4943 {
4944         int retval = dwc2_hcd_hub_control(dwc2_hcd_to_hsotg(hcd), typereq,
4945                                           wvalue, windex, buf, wlength);
4946         return retval;
4947 }
4948
4949 /* Handles hub TT buffer clear completions */
4950 static void _dwc2_hcd_clear_tt_buffer_complete(struct usb_hcd *hcd,
4951                                                struct usb_host_endpoint *ep)
4952 {
4953         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4954         struct dwc2_qh *qh;
4955         unsigned long flags;
4956
4957         qh = ep->hcpriv;
4958         if (!qh)
4959                 return;
4960
4961         spin_lock_irqsave(&hsotg->lock, flags);
4962         qh->tt_buffer_dirty = 0;
4963
4964         if (hsotg->flags.b.port_connect_status)
4965                 dwc2_hcd_queue_transactions(hsotg, DWC2_TRANSACTION_ALL);
4966
4967         spin_unlock_irqrestore(&hsotg->lock, flags);
4968 }
4969
4970 /*
4971  * HPRT0_SPD_HIGH_SPEED: high speed
4972  * HPRT0_SPD_FULL_SPEED: full speed
4973  */
4974 static void dwc2_change_bus_speed(struct usb_hcd *hcd, int speed)
4975 {
4976         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4977
4978         if (hsotg->params.speed == speed)
4979                 return;
4980
4981         hsotg->params.speed = speed;
4982         queue_work(hsotg->wq_otg, &hsotg->wf_otg);
4983 }
4984
4985 static void dwc2_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
4986 {
4987         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
4988
4989         if (!hsotg->params.change_speed_quirk)
4990                 return;
4991
4992         /*
4993          * On removal, set speed to default high-speed.
4994          */
4995         if (udev->parent && udev->parent->speed > USB_SPEED_UNKNOWN &&
4996             udev->parent->speed < USB_SPEED_HIGH) {
4997                 dev_info(hsotg->dev, "Set speed to default high-speed\n");
4998                 dwc2_change_bus_speed(hcd, HPRT0_SPD_HIGH_SPEED);
4999         }
5000 }
5001
5002 static int dwc2_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
5003 {
5004         struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
5005
5006         if (!hsotg->params.change_speed_quirk)
5007                 return 0;
5008
5009         if (udev->speed == USB_SPEED_HIGH) {
5010                 dev_info(hsotg->dev, "Set speed to high-speed\n");
5011                 dwc2_change_bus_speed(hcd, HPRT0_SPD_HIGH_SPEED);
5012         } else if ((udev->speed == USB_SPEED_FULL ||
5013                                 udev->speed == USB_SPEED_LOW)) {
5014                 /*
5015                  * Change speed setting to full-speed if there's
5016                  * a full-speed or low-speed device plugged in.
5017                  */
5018                 dev_info(hsotg->dev, "Set speed to full-speed\n");
5019                 dwc2_change_bus_speed(hcd, HPRT0_SPD_FULL_SPEED);
5020         }
5021
5022         return 0;
5023 }
5024
5025 static struct hc_driver dwc2_hc_driver = {
5026         .description = "dwc2_hsotg",
5027         .product_desc = "DWC OTG Controller",
5028         .hcd_priv_size = sizeof(struct wrapper_priv_data),
5029
5030         .irq = _dwc2_hcd_irq,
5031         .flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
5032
5033         .start = _dwc2_hcd_start,
5034         .stop = _dwc2_hcd_stop,
5035         .urb_enqueue = _dwc2_hcd_urb_enqueue,
5036         .urb_dequeue = _dwc2_hcd_urb_dequeue,
5037         .endpoint_disable = _dwc2_hcd_endpoint_disable,
5038         .endpoint_reset = _dwc2_hcd_endpoint_reset,
5039         .get_frame_number = _dwc2_hcd_get_frame_number,
5040
5041         .hub_status_data = _dwc2_hcd_hub_status_data,
5042         .hub_control = _dwc2_hcd_hub_control,
5043         .clear_tt_buffer_complete = _dwc2_hcd_clear_tt_buffer_complete,
5044
5045         .bus_suspend = _dwc2_hcd_suspend,
5046         .bus_resume = _dwc2_hcd_resume,
5047
5048         .map_urb_for_dma        = dwc2_map_urb_for_dma,
5049         .unmap_urb_for_dma      = dwc2_unmap_urb_for_dma,
5050 };
5051
5052 /*
5053  * Frees secondary storage associated with the dwc2_hsotg structure contained
5054  * in the struct usb_hcd field
5055  */
5056 static void dwc2_hcd_free(struct dwc2_hsotg *hsotg)
5057 {
5058         u32 ahbcfg;
5059         u32 dctl;
5060         int i;
5061
5062         dev_dbg(hsotg->dev, "DWC OTG HCD FREE\n");
5063
5064         /* Free memory for QH/QTD lists */
5065         dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_inactive);
5066         dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_waiting);
5067         dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_active);
5068         dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_inactive);
5069         dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_ready);
5070         dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_assigned);
5071         dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_queued);
5072
5073         /* Free memory for the host channels */
5074         for (i = 0; i < MAX_EPS_CHANNELS; i++) {
5075                 struct dwc2_host_chan *chan = hsotg->hc_ptr_array[i];
5076
5077                 if (chan) {
5078                         dev_dbg(hsotg->dev, "HCD Free channel #%i, chan=%p\n",
5079                                 i, chan);
5080                         hsotg->hc_ptr_array[i] = NULL;
5081                         kfree(chan);
5082                 }
5083         }
5084
5085         if (hsotg->params.host_dma) {
5086                 if (hsotg->status_buf) {
5087                         dma_free_coherent(hsotg->dev, DWC2_HCD_STATUS_BUF_SIZE,
5088                                           hsotg->status_buf,
5089                                           hsotg->status_buf_dma);
5090                         hsotg->status_buf = NULL;
5091                 }
5092         } else {
5093                 kfree(hsotg->status_buf);
5094                 hsotg->status_buf = NULL;
5095         }
5096
5097         ahbcfg = dwc2_readl(hsotg->regs + GAHBCFG);
5098
5099         /* Disable all interrupts */
5100         ahbcfg &= ~GAHBCFG_GLBL_INTR_EN;
5101         dwc2_writel(ahbcfg, hsotg->regs + GAHBCFG);
5102         dwc2_writel(0, hsotg->regs + GINTMSK);
5103
5104         if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a) {
5105                 dctl = dwc2_readl(hsotg->regs + DCTL);
5106                 dctl |= DCTL_SFTDISCON;
5107                 dwc2_writel(dctl, hsotg->regs + DCTL);
5108         }
5109
5110         if (hsotg->wq_otg) {
5111                 if (!cancel_work_sync(&hsotg->wf_otg))
5112                         flush_workqueue(hsotg->wq_otg);
5113                 destroy_workqueue(hsotg->wq_otg);
5114         }
5115
5116         del_timer(&hsotg->wkp_timer);
5117 }
5118
5119 static void dwc2_hcd_release(struct dwc2_hsotg *hsotg)
5120 {
5121         /* Turn off all host-specific interrupts */
5122         dwc2_disable_host_interrupts(hsotg);
5123
5124         dwc2_hcd_free(hsotg);
5125 }
5126
5127 /*
5128  * Initializes the HCD. This function allocates memory for and initializes the
5129  * static parts of the usb_hcd and dwc2_hsotg structures. It also registers the
5130  * USB bus with the core and calls the hc_driver->start() function. It returns
5131  * a negative error on failure.
5132  */
5133 int dwc2_hcd_init(struct dwc2_hsotg *hsotg)
5134 {
5135         struct platform_device *pdev = to_platform_device(hsotg->dev);
5136         struct resource *res;
5137         struct usb_hcd *hcd;
5138         struct dwc2_host_chan *channel;
5139         u32 hcfg;
5140         int i, num_channels;
5141         int retval;
5142
5143         if (usb_disabled())
5144                 return -ENODEV;
5145
5146         dev_dbg(hsotg->dev, "DWC OTG HCD INIT\n");
5147
5148         retval = -ENOMEM;
5149
5150         hcfg = dwc2_readl(hsotg->regs + HCFG);
5151         dev_dbg(hsotg->dev, "hcfg=%08x\n", hcfg);
5152
5153 #ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
5154         hsotg->frame_num_array = kcalloc(FRAME_NUM_ARRAY_SIZE,
5155                                          sizeof(*hsotg->frame_num_array),
5156                                          GFP_KERNEL);
5157         if (!hsotg->frame_num_array)
5158                 goto error1;
5159         hsotg->last_frame_num_array =
5160                 kcalloc(FRAME_NUM_ARRAY_SIZE,
5161                         sizeof(*hsotg->last_frame_num_array), GFP_KERNEL);
5162         if (!hsotg->last_frame_num_array)
5163                 goto error1;
5164 #endif
5165         hsotg->last_frame_num = HFNUM_MAX_FRNUM;
5166
5167         /* Check if the bus driver or platform code has setup a dma_mask */
5168         if (hsotg->params.host_dma &&
5169             !hsotg->dev->dma_mask) {
5170                 dev_warn(hsotg->dev,
5171                          "dma_mask not set, disabling DMA\n");
5172                 hsotg->params.host_dma = false;
5173                 hsotg->params.dma_desc_enable = false;
5174         }
5175
5176         /* Set device flags indicating whether the HCD supports DMA */
5177         if (hsotg->params.host_dma) {
5178                 if (dma_set_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
5179                         dev_warn(hsotg->dev, "can't set DMA mask\n");
5180                 if (dma_set_coherent_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
5181                         dev_warn(hsotg->dev, "can't set coherent DMA mask\n");
5182         }
5183
5184         if (hsotg->params.change_speed_quirk) {
5185                 dwc2_hc_driver.free_dev = dwc2_free_dev;
5186                 dwc2_hc_driver.reset_device = dwc2_reset_device;
5187         }
5188
5189         hcd = usb_create_hcd(&dwc2_hc_driver, hsotg->dev, dev_name(hsotg->dev));
5190         if (!hcd)
5191                 goto error1;
5192
5193         if (!hsotg->params.host_dma)
5194                 hcd->self.uses_dma = 0;
5195
5196         hcd->has_tt = 1;
5197
5198         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
5199         hcd->rsrc_start = res->start;
5200         hcd->rsrc_len = resource_size(res);
5201
5202         ((struct wrapper_priv_data *)&hcd->hcd_priv)->hsotg = hsotg;
5203         hsotg->priv = hcd;
5204
5205         /*
5206          * Disable the global interrupt until all the interrupt handlers are
5207          * installed
5208          */
5209         dwc2_disable_global_interrupts(hsotg);
5210
5211         /* Initialize the DWC_otg core, and select the Phy type */
5212         retval = dwc2_core_init(hsotg, true);
5213         if (retval)
5214                 goto error2;
5215
5216         /* Create new workqueue and init work */
5217         retval = -ENOMEM;
5218         hsotg->wq_otg = alloc_ordered_workqueue("dwc2", 0);
5219         if (!hsotg->wq_otg) {
5220                 dev_err(hsotg->dev, "Failed to create workqueue\n");
5221                 goto error2;
5222         }
5223         INIT_WORK(&hsotg->wf_otg, dwc2_conn_id_status_change);
5224
5225         timer_setup(&hsotg->wkp_timer, dwc2_wakeup_detected, 0);
5226
5227         /* Initialize the non-periodic schedule */
5228         INIT_LIST_HEAD(&hsotg->non_periodic_sched_inactive);
5229         INIT_LIST_HEAD(&hsotg->non_periodic_sched_waiting);
5230         INIT_LIST_HEAD(&hsotg->non_periodic_sched_active);
5231
5232         /* Initialize the periodic schedule */
5233         INIT_LIST_HEAD(&hsotg->periodic_sched_inactive);
5234         INIT_LIST_HEAD(&hsotg->periodic_sched_ready);
5235         INIT_LIST_HEAD(&hsotg->periodic_sched_assigned);
5236         INIT_LIST_HEAD(&hsotg->periodic_sched_queued);
5237
5238         INIT_LIST_HEAD(&hsotg->split_order);
5239
5240         /*
5241          * Create a host channel descriptor for each host channel implemented
5242          * in the controller. Initialize the channel descriptor array.
5243          */
5244         INIT_LIST_HEAD(&hsotg->free_hc_list);
5245         num_channels = hsotg->params.host_channels;
5246         memset(&hsotg->hc_ptr_array[0], 0, sizeof(hsotg->hc_ptr_array));
5247
5248         for (i = 0; i < num_channels; i++) {
5249                 channel = kzalloc(sizeof(*channel), GFP_KERNEL);
5250                 if (!channel)
5251                         goto error3;
5252                 channel->hc_num = i;
5253                 INIT_LIST_HEAD(&channel->split_order_list_entry);
5254                 hsotg->hc_ptr_array[i] = channel;
5255         }
5256
5257         /* Initialize hsotg start work */
5258         INIT_DELAYED_WORK(&hsotg->start_work, dwc2_hcd_start_func);
5259
5260         /* Initialize port reset work */
5261         INIT_DELAYED_WORK(&hsotg->reset_work, dwc2_hcd_reset_func);
5262
5263         /*
5264          * Allocate space for storing data on status transactions. Normally no
5265          * data is sent, but this space acts as a bit bucket. This must be
5266          * done after usb_add_hcd since that function allocates the DMA buffer
5267          * pool.
5268          */
5269         if (hsotg->params.host_dma)
5270                 hsotg->status_buf = dma_alloc_coherent(hsotg->dev,
5271                                         DWC2_HCD_STATUS_BUF_SIZE,
5272                                         &hsotg->status_buf_dma, GFP_KERNEL);
5273         else
5274                 hsotg->status_buf = kzalloc(DWC2_HCD_STATUS_BUF_SIZE,
5275                                           GFP_KERNEL);
5276
5277         if (!hsotg->status_buf)
5278                 goto error3;
5279
5280         /*
5281          * Create kmem caches to handle descriptor buffers in descriptor
5282          * DMA mode.
5283          * Alignment must be set to 512 bytes.
5284          */
5285         if (hsotg->params.dma_desc_enable ||
5286             hsotg->params.dma_desc_fs_enable) {
5287                 hsotg->desc_gen_cache = kmem_cache_create("dwc2-gen-desc",
5288                                 sizeof(struct dwc2_dma_desc) *
5289                                 MAX_DMA_DESC_NUM_GENERIC, 512, SLAB_CACHE_DMA,
5290                                 NULL);
5291                 if (!hsotg->desc_gen_cache) {
5292                         dev_err(hsotg->dev,
5293                                 "unable to create dwc2 generic desc cache\n");
5294
5295                         /*
5296                          * Disable descriptor dma mode since it will not be
5297                          * usable.
5298                          */
5299                         hsotg->params.dma_desc_enable = false;
5300                         hsotg->params.dma_desc_fs_enable = false;
5301                 }
5302
5303                 hsotg->desc_hsisoc_cache = kmem_cache_create("dwc2-hsisoc-desc",
5304                                 sizeof(struct dwc2_dma_desc) *
5305                                 MAX_DMA_DESC_NUM_HS_ISOC, 512, 0, NULL);
5306                 if (!hsotg->desc_hsisoc_cache) {
5307                         dev_err(hsotg->dev,
5308                                 "unable to create dwc2 hs isoc desc cache\n");
5309
5310                         kmem_cache_destroy(hsotg->desc_gen_cache);
5311
5312                         /*
5313                          * Disable descriptor dma mode since it will not be
5314                          * usable.
5315                          */
5316                         hsotg->params.dma_desc_enable = false;
5317                         hsotg->params.dma_desc_fs_enable = false;
5318                 }
5319         }
5320
5321         if (hsotg->params.host_dma) {
5322                 /*
5323                  * Create kmem caches to handle non-aligned buffer
5324                  * in Buffer DMA mode.
5325                  */
5326                 hsotg->unaligned_cache = kmem_cache_create("dwc2-unaligned-dma",
5327                                                 DWC2_KMEM_UNALIGNED_BUF_SIZE, 4,
5328                                                 SLAB_CACHE_DMA, NULL);
5329                 if (!hsotg->unaligned_cache)
5330                         dev_err(hsotg->dev,
5331                                 "unable to create dwc2 unaligned cache\n");
5332         }
5333
5334         hsotg->otg_port = 1;
5335         hsotg->frame_list = NULL;
5336         hsotg->frame_list_dma = 0;
5337         hsotg->periodic_qh_count = 0;
5338
5339         /* Initiate lx_state to L3 disconnected state */
5340         hsotg->lx_state = DWC2_L3;
5341
5342         hcd->self.otg_port = hsotg->otg_port;
5343
5344         /* Don't support SG list at this point */
5345         hcd->self.sg_tablesize = 0;
5346
5347         if (!IS_ERR_OR_NULL(hsotg->uphy))
5348                 otg_set_host(hsotg->uphy->otg, &hcd->self);
5349
5350         /*
5351          * Finish generic HCD initialization and start the HCD. This function
5352          * allocates the DMA buffer pool, registers the USB bus, requests the
5353          * IRQ line, and calls hcd_start method.
5354          */
5355         retval = usb_add_hcd(hcd, hsotg->irq, IRQF_SHARED);
5356         if (retval < 0)
5357                 goto error4;
5358
5359         device_wakeup_enable(hcd->self.controller);
5360
5361         dwc2_hcd_dump_state(hsotg);
5362
5363         dwc2_enable_global_interrupts(hsotg);
5364
5365         return 0;
5366
5367 error4:
5368         kmem_cache_destroy(hsotg->unaligned_cache);
5369         kmem_cache_destroy(hsotg->desc_hsisoc_cache);
5370         kmem_cache_destroy(hsotg->desc_gen_cache);
5371 error3:
5372         dwc2_hcd_release(hsotg);
5373 error2:
5374         usb_put_hcd(hcd);
5375 error1:
5376
5377 #ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
5378         kfree(hsotg->last_frame_num_array);
5379         kfree(hsotg->frame_num_array);
5380 #endif
5381
5382         dev_err(hsotg->dev, "%s() FAILED, returning %d\n", __func__, retval);
5383         return retval;
5384 }
5385
5386 /*
5387  * Removes the HCD.
5388  * Frees memory and resources associated with the HCD and deregisters the bus.
5389  */
5390 void dwc2_hcd_remove(struct dwc2_hsotg *hsotg)
5391 {
5392         struct usb_hcd *hcd;
5393
5394         dev_dbg(hsotg->dev, "DWC OTG HCD REMOVE\n");
5395
5396         hcd = dwc2_hsotg_to_hcd(hsotg);
5397         dev_dbg(hsotg->dev, "hsotg->hcd = %p\n", hcd);
5398
5399         if (!hcd) {
5400                 dev_dbg(hsotg->dev, "%s: dwc2_hsotg_to_hcd(hsotg) NULL!\n",
5401                         __func__);
5402                 return;
5403         }
5404
5405         if (!IS_ERR_OR_NULL(hsotg->uphy))
5406                 otg_set_host(hsotg->uphy->otg, NULL);
5407
5408         usb_remove_hcd(hcd);
5409         hsotg->priv = NULL;
5410
5411         kmem_cache_destroy(hsotg->unaligned_cache);
5412         kmem_cache_destroy(hsotg->desc_hsisoc_cache);
5413         kmem_cache_destroy(hsotg->desc_gen_cache);
5414
5415         dwc2_hcd_release(hsotg);
5416         usb_put_hcd(hcd);
5417
5418 #ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
5419         kfree(hsotg->last_frame_num_array);
5420         kfree(hsotg->frame_num_array);
5421 #endif
5422 }
5423
5424 /**
5425  * dwc2_backup_host_registers() - Backup controller host registers.
5426  * When suspending usb bus, registers needs to be backuped
5427  * if controller power is disabled once suspended.
5428  *
5429  * @hsotg: Programming view of the DWC_otg controller
5430  */
5431 int dwc2_backup_host_registers(struct dwc2_hsotg *hsotg)
5432 {
5433         struct dwc2_hregs_backup *hr;
5434         int i;
5435
5436         dev_dbg(hsotg->dev, "%s\n", __func__);
5437
5438         /* Backup Host regs */
5439         hr = &hsotg->hr_backup;
5440         hr->hcfg = dwc2_readl(hsotg->regs + HCFG);
5441         hr->haintmsk = dwc2_readl(hsotg->regs + HAINTMSK);
5442         for (i = 0; i < hsotg->params.host_channels; ++i)
5443                 hr->hcintmsk[i] = dwc2_readl(hsotg->regs + HCINTMSK(i));
5444
5445         hr->hprt0 = dwc2_read_hprt0(hsotg);
5446         hr->hfir = dwc2_readl(hsotg->regs + HFIR);
5447         hr->hptxfsiz = dwc2_readl(hsotg->regs + HPTXFSIZ);
5448         hr->valid = true;
5449
5450         return 0;
5451 }
5452
5453 /**
5454  * dwc2_restore_host_registers() - Restore controller host registers.
5455  * When resuming usb bus, device registers needs to be restored
5456  * if controller power were disabled.
5457  *
5458  * @hsotg: Programming view of the DWC_otg controller
5459  */
5460 int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg)
5461 {
5462         struct dwc2_hregs_backup *hr;
5463         int i;
5464
5465         dev_dbg(hsotg->dev, "%s\n", __func__);
5466
5467         /* Restore host regs */
5468         hr = &hsotg->hr_backup;
5469         if (!hr->valid) {
5470                 dev_err(hsotg->dev, "%s: no host registers to restore\n",
5471                         __func__);
5472                 return -EINVAL;
5473         }
5474         hr->valid = false;
5475
5476         dwc2_writel(hr->hcfg, hsotg->regs + HCFG);
5477         dwc2_writel(hr->haintmsk, hsotg->regs + HAINTMSK);
5478
5479         for (i = 0; i < hsotg->params.host_channels; ++i)
5480                 dwc2_writel(hr->hcintmsk[i], hsotg->regs + HCINTMSK(i));
5481
5482         dwc2_writel(hr->hprt0, hsotg->regs + HPRT0);
5483         dwc2_writel(hr->hfir, hsotg->regs + HFIR);
5484         dwc2_writel(hr->hptxfsiz, hsotg->regs + HPTXFSIZ);
5485         hsotg->frame_number = 0;
5486
5487         return 0;
5488 }
5489
5490 /**
5491  * dwc2_host_enter_hibernation() - Put controller in Hibernation.
5492  *
5493  * @hsotg: Programming view of the DWC_otg controller
5494  */
5495 int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg)
5496 {
5497         unsigned long flags;
5498         int ret = 0;
5499         u32 hprt0;
5500         u32 pcgcctl;
5501         u32 gusbcfg;
5502         u32 gpwrdn;
5503
5504         dev_dbg(hsotg->dev, "Preparing host for hibernation\n");
5505         ret = dwc2_backup_global_registers(hsotg);
5506         if (ret) {
5507                 dev_err(hsotg->dev, "%s: failed to backup global registers\n",
5508                         __func__);
5509                 return ret;
5510         }
5511         ret = dwc2_backup_host_registers(hsotg);
5512         if (ret) {
5513                 dev_err(hsotg->dev, "%s: failed to backup host registers\n",
5514                         __func__);
5515                 return ret;
5516         }
5517
5518         /* Enter USB Suspend Mode */
5519         hprt0 = dwc2_readl(hsotg->regs + HPRT0);
5520         hprt0 |= HPRT0_SUSP;
5521         hprt0 &= ~HPRT0_ENA;
5522         dwc2_writel(hprt0, hsotg->regs + HPRT0);
5523
5524         /* Wait for the HPRT0.PrtSusp register field to be set */
5525         if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 3000))
5526                 dev_warn(hsotg->dev, "Suspend wasn't generated\n");
5527
5528         /*
5529          * We need to disable interrupts to prevent servicing of any IRQ
5530          * during going to hibernation
5531          */
5532         spin_lock_irqsave(&hsotg->lock, flags);
5533         hsotg->lx_state = DWC2_L2;
5534
5535         gusbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
5536         if (gusbcfg & GUSBCFG_ULPI_UTMI_SEL) {
5537                 /* ULPI interface */
5538                 /* Suspend the Phy Clock */
5539                 pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
5540                 pcgcctl |= PCGCTL_STOPPCLK;
5541                 dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
5542                 udelay(10);
5543
5544                 gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
5545                 gpwrdn |= GPWRDN_PMUACTV;
5546                 dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
5547                 udelay(10);
5548         } else {
5549                 /* UTMI+ Interface */
5550                 gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
5551                 gpwrdn |= GPWRDN_PMUACTV;
5552                 dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
5553                 udelay(10);
5554
5555                 pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
5556                 pcgcctl |= PCGCTL_STOPPCLK;
5557                 dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
5558                 udelay(10);
5559         }
5560
5561         /* Enable interrupts from wake up logic */
5562         gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
5563         gpwrdn |= GPWRDN_PMUINTSEL;
5564         dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
5565         udelay(10);
5566
5567         /* Unmask host mode interrupts in GPWRDN */
5568         gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
5569         gpwrdn |= GPWRDN_DISCONN_DET_MSK;
5570         gpwrdn |= GPWRDN_LNSTSCHG_MSK;
5571         gpwrdn |= GPWRDN_STS_CHGINT_MSK;
5572         dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
5573         udelay(10);
5574
5575         /* Enable Power Down Clamp */
5576         gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
5577         gpwrdn |= GPWRDN_PWRDNCLMP;
5578         dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
5579         udelay(10);
5580
5581         /* Switch off VDD */
5582         gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
5583         gpwrdn |= GPWRDN_PWRDNSWTCH;
5584         dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
5585
5586         hsotg->hibernated = 1;
5587         hsotg->bus_suspended = 1;
5588         dev_dbg(hsotg->dev, "Host hibernation completed\n");
5589         spin_unlock_irqrestore(&hsotg->lock, flags);
5590         return ret;
5591 }
5592
5593 /*
5594  * dwc2_host_exit_hibernation()
5595  *
5596  * @hsotg: Programming view of the DWC_otg controller
5597  * @rem_wakeup: indicates whether resume is initiated by Device or Host.
5598  * @param reset: indicates whether resume is initiated by Reset.
5599  *
5600  * Return: non-zero if failed to enter to hibernation.
5601  *
5602  * This function is for exiting from Host mode hibernation by
5603  * Host Initiated Resume/Reset and Device Initiated Remote-Wakeup.
5604  */
5605 int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup,
5606                                int reset)
5607 {
5608         u32 gpwrdn;
5609         u32 hprt0;
5610         int ret = 0;
5611         struct dwc2_gregs_backup *gr;
5612         struct dwc2_hregs_backup *hr;
5613
5614         gr = &hsotg->gr_backup;
5615         hr = &hsotg->hr_backup;
5616
5617         dev_dbg(hsotg->dev,
5618                 "%s: called with rem_wakeup = %d reset = %d\n",
5619                 __func__, rem_wakeup, reset);
5620
5621         dwc2_hib_restore_common(hsotg, rem_wakeup, 1);
5622         hsotg->hibernated = 0;
5623
5624         /*
5625          * This step is not described in functional spec but if not wait for
5626          * this delay, mismatch interrupts occurred because just after restore
5627          * core is in Device mode(gintsts.curmode == 0)
5628          */
5629         mdelay(100);
5630
5631         /* Clear all pending interupts */
5632         dwc2_writel(0xffffffff, hsotg->regs + GINTSTS);
5633
5634         /* De-assert Restore */
5635         gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
5636         gpwrdn &= ~GPWRDN_RESTORE;
5637         dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
5638         udelay(10);
5639
5640         /* Restore GUSBCFG, HCFG */
5641         dwc2_writel(gr->gusbcfg, hsotg->regs + GUSBCFG);
5642         dwc2_writel(hr->hcfg, hsotg->regs + HCFG);
5643
5644         /* De-assert Wakeup Logic */
5645         gpwrdn = dwc2_readl(hsotg->regs + GPWRDN);
5646         gpwrdn &= ~GPWRDN_PMUACTV;
5647         dwc2_writel(gpwrdn, hsotg->regs + GPWRDN);
5648         udelay(10);
5649
5650         hprt0 = hr->hprt0;
5651         hprt0 |= HPRT0_PWR;
5652         hprt0 &= ~HPRT0_ENA;
5653         hprt0 &= ~HPRT0_SUSP;
5654         dwc2_writel(hprt0, hsotg->regs + HPRT0);
5655
5656         hprt0 = hr->hprt0;
5657         hprt0 |= HPRT0_PWR;
5658         hprt0 &= ~HPRT0_ENA;
5659         hprt0 &= ~HPRT0_SUSP;
5660
5661         if (reset) {
5662                 hprt0 |= HPRT0_RST;
5663                 dwc2_writel(hprt0, hsotg->regs + HPRT0);
5664
5665                 /* Wait for Resume time and then program HPRT again */
5666                 mdelay(60);
5667                 hprt0 &= ~HPRT0_RST;
5668                 dwc2_writel(hprt0, hsotg->regs + HPRT0);
5669         } else {
5670                 hprt0 |= HPRT0_RES;
5671                 dwc2_writel(hprt0, hsotg->regs + HPRT0);
5672
5673                 /* Wait for Resume time and then program HPRT again */
5674                 mdelay(100);
5675                 hprt0 &= ~HPRT0_RES;
5676                 dwc2_writel(hprt0, hsotg->regs + HPRT0);
5677         }
5678         /* Clear all interrupt status */
5679         hprt0 = dwc2_readl(hsotg->regs + HPRT0);
5680         hprt0 |= HPRT0_CONNDET;
5681         hprt0 |= HPRT0_ENACHG;
5682         hprt0 &= ~HPRT0_ENA;
5683         dwc2_writel(hprt0, hsotg->regs + HPRT0);
5684
5685         hprt0 = dwc2_readl(hsotg->regs + HPRT0);
5686
5687         /* Clear all pending interupts */
5688         dwc2_writel(0xffffffff, hsotg->regs + GINTSTS);
5689
5690         /* Restore global registers */
5691         ret = dwc2_restore_global_registers(hsotg);
5692         if (ret) {
5693                 dev_err(hsotg->dev, "%s: failed to restore registers\n",
5694                         __func__);
5695                 return ret;
5696         }
5697
5698         /* Restore host registers */
5699         ret = dwc2_restore_host_registers(hsotg);
5700         if (ret) {
5701                 dev_err(hsotg->dev, "%s: failed to restore host registers\n",
5702                         __func__);
5703                 return ret;
5704         }
5705
5706         dwc2_hcd_rem_wakeup(hsotg);
5707
5708         hsotg->hibernated = 0;
5709         hsotg->bus_suspended = 0;
5710         hsotg->lx_state = DWC2_L0;
5711         dev_dbg(hsotg->dev, "Host hibernation restore complete\n");
5712         return ret;
5713 }