drivers/usb/dwc3/dwc3-omap.c

   1 /**
   2  * dwc3-omap.c - OMAP Specific Glue layer
   3  *
   4  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Authors: Felipe Balbi <balbi@ti.com>,
   7  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2  of
  11  * the License as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/slab.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/platform_data/dwc3-omap.h>
  25 #include <linux/pm_runtime.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/ioport.h>
  28 #include <linux/io.h>
  29 #include <linux/of.h>
  30 #include <linux/of_platform.h>
  31 #include <linux/extcon.h>
  32 #include <linux/regulator/consumer.h>
  33
  34 #include <linux/usb/otg.h>
  35
  36 /*
  37  * All these registers belong to OMAP's Wrapper around the
  38  * DesignWare USB3 Core.
  39  */
  40
  41 #define USBOTGSS_REVISION                       0x0000
  42 #define USBOTGSS_SYSCONFIG                      0x0010
  43 #define USBOTGSS_IRQ_EOI                        0x0020
  44 #define USBOTGSS_EOI_OFFSET                     0x0008
  45 #define USBOTGSS_IRQSTATUS_RAW_0                0x0024
  46 #define USBOTGSS_IRQSTATUS_0                    0x0028
  47 #define USBOTGSS_IRQENABLE_SET_0                0x002c
  48 #define USBOTGSS_IRQENABLE_CLR_0                0x0030
  49 #define USBOTGSS_IRQ0_OFFSET                    0x0004
  50 #define USBOTGSS_IRQSTATUS_RAW_1                0x0030
  51 #define USBOTGSS_IRQSTATUS_1                    0x0034
  52 #define USBOTGSS_IRQENABLE_SET_1                0x0038
  53 #define USBOTGSS_IRQENABLE_CLR_1                0x003c
  54 #define USBOTGSS_IRQSTATUS_RAW_2                0x0040
  55 #define USBOTGSS_IRQSTATUS_2                    0x0044
  56 #define USBOTGSS_IRQENABLE_SET_2                0x0048
  57 #define USBOTGSS_IRQENABLE_CLR_2                0x004c
  58 #define USBOTGSS_IRQSTATUS_RAW_3                0x0050
  59 #define USBOTGSS_IRQSTATUS_3                    0x0054
  60 #define USBOTGSS_IRQENABLE_SET_3                0x0058
  61 #define USBOTGSS_IRQENABLE_CLR_3                0x005c
  62 #define USBOTGSS_IRQSTATUS_EOI_MISC             0x0030
  63 #define USBOTGSS_IRQSTATUS_RAW_MISC             0x0034
  64 #define USBOTGSS_IRQSTATUS_MISC                 0x0038
  65 #define USBOTGSS_IRQENABLE_SET_MISC             0x003c
  66 #define USBOTGSS_IRQENABLE_CLR_MISC             0x0040
  67 #define USBOTGSS_IRQMISC_OFFSET                 0x03fc
  68 #define USBOTGSS_UTMI_OTG_CTRL                  0x0080
  69 #define USBOTGSS_UTMI_OTG_STATUS                0x0084
  70 #define USBOTGSS_UTMI_OTG_OFFSET                0x0480
  71 #define USBOTGSS_TXFIFO_DEPTH                   0x0508
  72 #define USBOTGSS_RXFIFO_DEPTH                   0x050c
  73 #define USBOTGSS_MMRAM_OFFSET                   0x0100
  74 #define USBOTGSS_FLADJ                          0x0104
  75 #define USBOTGSS_DEBUG_CFG                      0x0108
  76 #define USBOTGSS_DEBUG_DATA                     0x010c
  77 #define USBOTGSS_DEV_EBC_EN                     0x0110
  78 #define USBOTGSS_DEBUG_OFFSET                   0x0600
  79
  80 /* REVISION REGISTER */
  81 #define USBOTGSS_REVISION_XMAJOR(reg)           ((reg >> 8) & 0x7)
  82 #define USBOTGSS_REVISION_XMAJOR1               1
  83 #define USBOTGSS_REVISION_XMAJOR2               2
  84 /* SYSCONFIG REGISTER */
  85 #define USBOTGSS_SYSCONFIG_DMADISABLE           (1 << 16)
  86
  87 /* IRQ_EOI REGISTER */
  88 #define USBOTGSS_IRQ_EOI_LINE_NUMBER            (1 << 0)
  89
  90 /* IRQS0 BITS */
  91 #define USBOTGSS_IRQO_COREIRQ_ST                (1 << 0)
  92
  93 /* IRQMISC BITS */
  94 #define USBOTGSS_IRQMISC_DMADISABLECLR          (1 << 17)
  95 #define USBOTGSS_IRQMISC_OEVT                   (1 << 16)
  96 #define USBOTGSS_IRQMISC_DRVVBUS_RISE           (1 << 13)
  97 #define USBOTGSS_IRQMISC_CHRGVBUS_RISE          (1 << 12)
  98 #define USBOTGSS_IRQMISC_DISCHRGVBUS_RISE       (1 << 11)
  99 #define USBOTGSS_IRQMISC_IDPULLUP_RISE          (1 << 8)
 100 #define USBOTGSS_IRQMISC_DRVVBUS_FALL           (1 << 5)
 101 #define USBOTGSS_IRQMISC_CHRGVBUS_FALL          (1 << 4)
 102 #define USBOTGSS_IRQMISC_DISCHRGVBUS_FALL               (1 << 3)
 103 #define USBOTGSS_IRQMISC_IDPULLUP_FALL          (1 << 0)
 104
 105 /* UTMI_OTG_CTRL REGISTER */
 106 #define USBOTGSS_UTMI_OTG_CTRL_DRVVBUS          (1 << 5)
 107 #define USBOTGSS_UTMI_OTG_CTRL_CHRGVBUS         (1 << 4)
 108 #define USBOTGSS_UTMI_OTG_CTRL_DISCHRGVBUS      (1 << 3)
 109 #define USBOTGSS_UTMI_OTG_CTRL_IDPULLUP         (1 << 0)
 110
 111 /* UTMI_OTG_STATUS REGISTER */
 112 #define USBOTGSS_UTMI_OTG_STATUS_SW_MODE        (1 << 31)
 113 #define USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT   (1 << 9)
 114 #define USBOTGSS_UTMI_OTG_STATUS_TXBITSTUFFENABLE (1 << 8)
 115 #define USBOTGSS_UTMI_OTG_STATUS_IDDIG          (1 << 4)
 116 #define USBOTGSS_UTMI_OTG_STATUS_SESSEND        (1 << 3)
 117 #define USBOTGSS_UTMI_OTG_STATUS_SESSVALID      (1 << 2)
 118 #define USBOTGSS_UTMI_OTG_STATUS_VBUSVALID      (1 << 1)
 119
 120 struct dwc3_omap {
 121         struct device           *dev;
 122
 123         int                     irq;
 124         void __iomem            *base;
 125
 126         u32                     utmi_otg_status;
 127         u32                     utmi_otg_offset;
 128         u32                     irqmisc_offset;
 129         u32                     irq_eoi_offset;
 130         u32                     debug_offset;
 131         u32                     irq0_offset;
 132         u32                     revision;
 133
 134         u32                     dma_status:1;
 135
 136         struct extcon_specific_cable_nb extcon_vbus_dev;
 137         struct extcon_specific_cable_nb extcon_id_dev;
 138         struct notifier_block   vbus_nb;
 139         struct notifier_block   id_nb;
 140
 141         struct regulator        *vbus_reg;
 142 };
 143
 144 enum omap_dwc3_vbus_id_status {
 145         OMAP_DWC3_ID_FLOAT,
 146         OMAP_DWC3_ID_GROUND,
 147         OMAP_DWC3_VBUS_OFF,
 148         OMAP_DWC3_VBUS_VALID,
 149 };
 150
 151 static inline u32 dwc3_omap_readl(void __iomem *base, u32 offset)
 152 {
 153         return readl(base + offset);
 154 }
 155
 156 static inline void dwc3_omap_writel(void __iomem *base, u32 offset, u32 value)
 157 {
 158         writel(value, base + offset);
 159 }
 160
 161 static u32 dwc3_omap_read_utmi_status(struct dwc3_omap *omap)
 162 {
 163         return dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS +
 164                                                         omap->utmi_otg_offset);
 165 }
 166
 167 static void dwc3_omap_write_utmi_status(struct dwc3_omap *omap, u32 value)
 168 {
 169         dwc3_omap_writel(omap->base, USBOTGSS_UTMI_OTG_STATUS +
 170                                         omap->utmi_otg_offset, value);
 171
 172 }
 173
 174 static u32 dwc3_omap_read_irq0_status(struct dwc3_omap *omap)
 175 {
 176         return dwc3_omap_readl(omap->base, USBOTGSS_IRQSTATUS_0 -
 177                                                 omap->irq0_offset);
 178 }
 179
 180 static void dwc3_omap_write_irq0_status(struct dwc3_omap *omap, u32 value)
 181 {
 182         dwc3_omap_writel(omap->base, USBOTGSS_IRQSTATUS_0 -
 183                                                 omap->irq0_offset, value);
 184
 185 }
 186
 187 static u32 dwc3_omap_read_irqmisc_status(struct dwc3_omap *omap)
 188 {
 189         return dwc3_omap_readl(omap->base, USBOTGSS_IRQSTATUS_MISC +
 190                                                 omap->irqmisc_offset);
 191 }
 192
 193 static void dwc3_omap_write_irqmisc_status(struct dwc3_omap *omap, u32 value)
 194 {
 195         dwc3_omap_writel(omap->base, USBOTGSS_IRQSTATUS_MISC +
 196                                         omap->irqmisc_offset, value);
 197
 198 }
 199
 200 static void dwc3_omap_write_irqmisc_set(struct dwc3_omap *omap, u32 value)
 201 {
 202         dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_SET_MISC +
 203                                                 omap->irqmisc_offset, value);
 204
 205 }
 206
 207 static void dwc3_omap_write_irq0_set(struct dwc3_omap *omap, u32 value)
 208 {
 209         dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_SET_0 -
 210                                                 omap->irq0_offset, value);
 211 }
 212
 213 static void dwc3_omap_set_mailbox(struct dwc3_omap *omap,
 214         enum omap_dwc3_vbus_id_status status)
 215 {
 216         int     ret;
 217         u32     val;
 218
 219         switch (status) {
 220         case OMAP_DWC3_ID_GROUND:
 221                 dev_dbg(omap->dev, "ID GND\n");
 222
 223                 if (omap->vbus_reg) {
 224                         ret = regulator_enable(omap->vbus_reg);
 225                         if (ret) {
 226                                 dev_dbg(omap->dev, "regulator enable failed\n");
 227                                 return;
 228                         }
 229                 }
 230
 231                 val = dwc3_omap_read_utmi_status(omap);
 232                 val &= ~(USBOTGSS_UTMI_OTG_STATUS_IDDIG
 233                                 | USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
 234                                 | USBOTGSS_UTMI_OTG_STATUS_SESSEND);
 235                 val |= USBOTGSS_UTMI_OTG_STATUS_SESSVALID
 236                                 | USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;
 237                 dwc3_omap_write_utmi_status(omap, val);
 238                 break;
 239
 240         case OMAP_DWC3_VBUS_VALID:
 241                 dev_dbg(omap->dev, "VBUS Connect\n");
 242
 243                 val = dwc3_omap_read_utmi_status(omap);
 244                 val &= ~USBOTGSS_UTMI_OTG_STATUS_SESSEND;
 245                 val |= USBOTGSS_UTMI_OTG_STATUS_IDDIG
 246                                 | USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
 247                                 | USBOTGSS_UTMI_OTG_STATUS_SESSVALID
 248                                 | USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;
 249                 dwc3_omap_write_utmi_status(omap, val);
 250                 break;
 251
 252         case OMAP_DWC3_ID_FLOAT:
 253                 if (omap->vbus_reg)
 254                         regulator_disable(omap->vbus_reg);
 255
 256         case OMAP_DWC3_VBUS_OFF:
 257                 dev_dbg(omap->dev, "VBUS Disconnect\n");
 258
 259                 val = dwc3_omap_read_utmi_status(omap);
 260                 val &= ~(USBOTGSS_UTMI_OTG_STATUS_SESSVALID
 261                                 | USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
 262                                 | USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT);
 263                 val |= USBOTGSS_UTMI_OTG_STATUS_SESSEND
 264                                 | USBOTGSS_UTMI_OTG_STATUS_IDDIG;
 265                 dwc3_omap_write_utmi_status(omap, val);
 266                 break;
 267
 268         default:
 269                 dev_dbg(omap->dev, "invalid state\n");
 270         }
 271 }
 272
 273 static irqreturn_t dwc3_omap_interrupt(int irq, void *_omap)
 274 {
 275         struct dwc3_omap        *omap = _omap;
 276         u32                     reg;
 277
 278         reg = dwc3_omap_read_irqmisc_status(omap);
 279
 280         if (reg & USBOTGSS_IRQMISC_DMADISABLECLR) {
 281                 dev_dbg(omap->dev, "DMA Disable was Cleared\n");
 282                 omap->dma_status = false;
 283         }
 284
 285         if (reg & USBOTGSS_IRQMISC_OEVT)
 286                 dev_dbg(omap->dev, "OTG Event\n");
 287
 288         if (reg & USBOTGSS_IRQMISC_DRVVBUS_RISE)
 289                 dev_dbg(omap->dev, "DRVVBUS Rise\n");
 290
 291         if (reg & USBOTGSS_IRQMISC_CHRGVBUS_RISE)
 292                 dev_dbg(omap->dev, "CHRGVBUS Rise\n");
 293
 294         if (reg & USBOTGSS_IRQMISC_DISCHRGVBUS_RISE)
 295                 dev_dbg(omap->dev, "DISCHRGVBUS Rise\n");
 296
 297         if (reg & USBOTGSS_IRQMISC_IDPULLUP_RISE)
 298                 dev_dbg(omap->dev, "IDPULLUP Rise\n");
 299
 300         if (reg & USBOTGSS_IRQMISC_DRVVBUS_FALL)
 301                 dev_dbg(omap->dev, "DRVVBUS Fall\n");
 302
 303         if (reg & USBOTGSS_IRQMISC_CHRGVBUS_FALL)
 304                 dev_dbg(omap->dev, "CHRGVBUS Fall\n");
 305
 306         if (reg & USBOTGSS_IRQMISC_DISCHRGVBUS_FALL)
 307                 dev_dbg(omap->dev, "DISCHRGVBUS Fall\n");
 308
 309         if (reg & USBOTGSS_IRQMISC_IDPULLUP_FALL)
 310                 dev_dbg(omap->dev, "IDPULLUP Fall\n");
 311
 312         dwc3_omap_write_irqmisc_status(omap, reg);
 313
 314         reg = dwc3_omap_read_irq0_status(omap);
 315
 316         dwc3_omap_write_irq0_status(omap, reg);
 317
 318         return IRQ_HANDLED;
 319 }
 320
 321 static int dwc3_omap_remove_core(struct device *dev, void *c)
 322 {
 323         struct platform_device *pdev = to_platform_device(dev);
 324
 325         platform_device_unregister(pdev);
 326
 327         return 0;
 328 }
 329
 330 static void dwc3_omap_enable_irqs(struct dwc3_omap *omap)
 331 {
 332         u32                     reg;
 333
 334         /* enable all IRQs */
 335         reg = USBOTGSS_IRQO_COREIRQ_ST;
 336         dwc3_omap_write_irq0_set(omap, reg);
 337
 338         reg = (USBOTGSS_IRQMISC_OEVT |
 339                         USBOTGSS_IRQMISC_DRVVBUS_RISE |
 340                         USBOTGSS_IRQMISC_CHRGVBUS_RISE |
 341                         USBOTGSS_IRQMISC_DISCHRGVBUS_RISE |
 342                         USBOTGSS_IRQMISC_IDPULLUP_RISE |
 343                         USBOTGSS_IRQMISC_DRVVBUS_FALL |
 344                         USBOTGSS_IRQMISC_CHRGVBUS_FALL |
 345                         USBOTGSS_IRQMISC_DISCHRGVBUS_FALL |
 346                         USBOTGSS_IRQMISC_IDPULLUP_FALL);
 347
 348         dwc3_omap_write_irqmisc_set(omap, reg);
 349 }
 350
 351 static void dwc3_omap_disable_irqs(struct dwc3_omap *omap)
 352 {
 353         /* disable all IRQs */
 354         dwc3_omap_write_irqmisc_set(omap, 0x00);
 355         dwc3_omap_write_irq0_set(omap, 0x00);
 356 }
 357
 358 static u64 dwc3_omap_dma_mask = DMA_BIT_MASK(32);
 359
 360 static int dwc3_omap_id_notifier(struct notifier_block *nb,
 361         unsigned long event, void *ptr)
 362 {
 363         struct dwc3_omap *omap = container_of(nb, struct dwc3_omap, id_nb);
 364
 365         if (event)
 366                 dwc3_omap_set_mailbox(omap, OMAP_DWC3_ID_GROUND);
 367         else
 368                 dwc3_omap_set_mailbox(omap, OMAP_DWC3_ID_FLOAT);
 369
 370         return NOTIFY_DONE;
 371 }
 372
 373 static int dwc3_omap_vbus_notifier(struct notifier_block *nb,
 374         unsigned long event, void *ptr)
 375 {
 376         struct dwc3_omap *omap = container_of(nb, struct dwc3_omap, vbus_nb);
 377
 378         if (event)
 379                 dwc3_omap_set_mailbox(omap, OMAP_DWC3_VBUS_VALID);
 380         else
 381                 dwc3_omap_set_mailbox(omap, OMAP_DWC3_VBUS_OFF);
 382
 383         return NOTIFY_DONE;
 384 }
 385
 386 static int dwc3_omap_probe(struct platform_device *pdev)
 387 {
 388         struct device_node      *node = pdev->dev.of_node;
 389
 390         struct dwc3_omap        *omap;
 391         struct resource         *res;
 392         struct device           *dev = &pdev->dev;
 393         struct extcon_dev       *edev;
 394         struct regulator        *vbus_reg = NULL;
 395
 396         int                     ret;
 397         int                     irq;
 398
 399         int                     utmi_mode = 0;
 400         int                     x_major;
 401
 402         u32                     reg;
 403
 404         void __iomem            *base;
 405
 406         if (!node) {
 407                 dev_err(dev, "device node not found\n");
 408                 return -EINVAL;
 409         }
 410
 411         omap = devm_kzalloc(dev, sizeof(*omap), GFP_KERNEL);
 412         if (!omap) {
 413                 dev_err(dev, "not enough memory\n");
 414                 return -ENOMEM;
 415         }
 416
 417         platform_set_drvdata(pdev, omap);
 418
 419         irq = platform_get_irq(pdev, 0);
 420         if (irq < 0) {
 421                 dev_err(dev, "missing IRQ resource\n");
 422                 return -EINVAL;
 423         }
 424
 425         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 426         base = devm_ioremap_resource(dev, res);
 427         if (IS_ERR(base))
 428                 return PTR_ERR(base);
 429
 430         if (of_property_read_bool(node, "vbus-supply")) {
 431                 vbus_reg = devm_regulator_get(dev, "vbus");
 432                 if (IS_ERR(vbus_reg)) {
 433                         dev_err(dev, "vbus init failed\n");
 434                         return PTR_ERR(vbus_reg);
 435                 }
 436         }
 437
 438         omap->dev       = dev;
 439         omap->irq       = irq;
 440         omap->base      = base;
 441         omap->vbus_reg  = vbus_reg;
 442         dev->dma_mask   = &dwc3_omap_dma_mask;
 443
 444         pm_runtime_enable(dev);
 445         ret = pm_runtime_get_sync(dev);
 446         if (ret < 0) {
 447                 dev_err(dev, "get_sync failed with err %d\n", ret);
 448                 goto err0;
 449         }
 450
 451         reg = dwc3_omap_readl(omap->base, USBOTGSS_REVISION);
 452         omap->revision = reg;
 453         x_major = USBOTGSS_REVISION_XMAJOR(reg);
 454
 455         /* Differentiate between OMAP5 and AM437x */
 456         switch (x_major) {
 457         case USBOTGSS_REVISION_XMAJOR1:
 458         case USBOTGSS_REVISION_XMAJOR2:
 459                 omap->irq_eoi_offset = 0;
 460                 omap->irq0_offset = 0;
 461                 omap->irqmisc_offset = 0;
 462                 omap->utmi_otg_offset = 0;
 463                 omap->debug_offset = 0;
 464                 break;
 465         default:
 466                 /* Default to the latest revision */
 467                 omap->irq_eoi_offset = USBOTGSS_EOI_OFFSET;
 468                 omap->irq0_offset = USBOTGSS_IRQ0_OFFSET;
 469                 omap->irqmisc_offset = USBOTGSS_IRQMISC_OFFSET;
 470                 omap->utmi_otg_offset = USBOTGSS_UTMI_OTG_OFFSET;
 471                 omap->debug_offset = USBOTGSS_DEBUG_OFFSET;
 472                 break;
 473         }
 474
 475         /* For OMAP5(ES2.0) and AM437x x_major is 2 even though there are
 476          * changes in wrapper registers, Using dt compatible for aegis
 477          */
 478
 479         if (of_device_is_compatible(node, "ti,am437x-dwc3")) {
 480                 omap->irq_eoi_offset = USBOTGSS_EOI_OFFSET;
 481                 omap->irq0_offset = USBOTGSS_IRQ0_OFFSET;
 482                 omap->irqmisc_offset = USBOTGSS_IRQMISC_OFFSET;
 483                 omap->utmi_otg_offset = USBOTGSS_UTMI_OTG_OFFSET;
 484                 omap->debug_offset = USBOTGSS_DEBUG_OFFSET;
 485         }
 486
 487         reg = dwc3_omap_read_utmi_status(omap);
 488
 489         of_property_read_u32(node, "utmi-mode", &utmi_mode);
 490
 491         switch (utmi_mode) {
 492         case DWC3_OMAP_UTMI_MODE_SW:
 493                 reg |= USBOTGSS_UTMI_OTG_STATUS_SW_MODE;
 494                 break;
 495         case DWC3_OMAP_UTMI_MODE_HW:
 496                 reg &= ~USBOTGSS_UTMI_OTG_STATUS_SW_MODE;
 497                 break;
 498         default:
 499                 dev_dbg(dev, "UNKNOWN utmi mode %d\n", utmi_mode);
 500         }
 501
 502         dwc3_omap_write_utmi_status(omap, reg);
 503
 504         /* check the DMA Status */
 505         reg = dwc3_omap_readl(omap->base, USBOTGSS_SYSCONFIG);
 506         omap->dma_status = !!(reg & USBOTGSS_SYSCONFIG_DMADISABLE);
 507
 508         ret = devm_request_irq(dev, omap->irq, dwc3_omap_interrupt, 0,
 509                         "dwc3-omap", omap);
 510         if (ret) {
 511                 dev_err(dev, "failed to request IRQ #%d --> %d\n",
 512                                 omap->irq, ret);
 513                 goto err1;
 514         }
 515
 516         dwc3_omap_enable_irqs(omap);
 517
 518         if (of_property_read_bool(node, "extcon")) {
 519                 edev = extcon_get_edev_by_phandle(dev, 0);
 520                 if (IS_ERR(edev)) {
 521                         dev_vdbg(dev, "couldn't get extcon device\n");
 522                         ret = -EPROBE_DEFER;
 523                         goto err2;
 524                 }
 525
 526                 omap->vbus_nb.notifier_call = dwc3_omap_vbus_notifier;
 527                 ret = extcon_register_interest(&omap->extcon_vbus_dev,
 528                         edev->name, "USB", &omap->vbus_nb);
 529                 if (ret < 0)
 530                         dev_vdbg(dev, "failed to register notifier for USB\n");
 531                 omap->id_nb.notifier_call = dwc3_omap_id_notifier;
 532                 ret = extcon_register_interest(&omap->extcon_id_dev, edev->name,
 533                                          "USB-HOST", &omap->id_nb);
 534                 if (ret < 0)
 535                         dev_vdbg(dev,
 536                                 "failed to register notifier for USB-HOST\n");
 537
 538                 if (extcon_get_cable_state(edev, "USB") == true)
 539                         dwc3_omap_set_mailbox(omap, OMAP_DWC3_VBUS_VALID);
 540                 if (extcon_get_cable_state(edev, "USB-HOST") == true)
 541                         dwc3_omap_set_mailbox(omap, OMAP_DWC3_ID_GROUND);
 542         }
 543
 544         ret = of_platform_populate(node, NULL, NULL, dev);
 545         if (ret) {
 546                 dev_err(&pdev->dev, "failed to create dwc3 core\n");
 547                 goto err3;
 548         }
 549
 550         return 0;
 551
 552 err3:
 553         if (omap->extcon_vbus_dev.edev)
 554                 extcon_unregister_interest(&omap->extcon_vbus_dev);
 555         if (omap->extcon_id_dev.edev)
 556                 extcon_unregister_interest(&omap->extcon_id_dev);
 557
 558 err2:
 559         dwc3_omap_disable_irqs(omap);
 560
 561 err1:
 562         pm_runtime_put_sync(dev);
 563
 564 err0:
 565         pm_runtime_disable(dev);
 566
 567         return ret;
 568 }
 569
 570 static int dwc3_omap_remove(struct platform_device *pdev)
 571 {
 572         struct dwc3_omap        *omap = platform_get_drvdata(pdev);
 573
 574         if (omap->extcon_vbus_dev.edev)
 575                 extcon_unregister_interest(&omap->extcon_vbus_dev);
 576         if (omap->extcon_id_dev.edev)
 577                 extcon_unregister_interest(&omap->extcon_id_dev);
 578         dwc3_omap_disable_irqs(omap);
 579         pm_runtime_put_sync(&pdev->dev);
 580         pm_runtime_disable(&pdev->dev);
 581         device_for_each_child(&pdev->dev, NULL, dwc3_omap_remove_core);
 582
 583         return 0;
 584 }
 585
 586 static const struct of_device_id of_dwc3_match[] = {
 587         {
 588                 .compatible =   "ti,dwc3"
 589         },
 590         {
 591                 .compatible =   "ti,am437x-dwc3"
 592         },
 593         { },
 594 };
 595 MODULE_DEVICE_TABLE(of, of_dwc3_match);
 596
 597 #ifdef CONFIG_PM_SLEEP
 598 static int dwc3_omap_prepare(struct device *dev)
 599 {
 600         struct dwc3_omap        *omap = dev_get_drvdata(dev);
 601
 602         dwc3_omap_disable_irqs(omap);
 603
 604         return 0;
 605 }
 606
 607 static void dwc3_omap_complete(struct device *dev)
 608 {
 609         struct dwc3_omap        *omap = dev_get_drvdata(dev);
 610
 611         dwc3_omap_enable_irqs(omap);
 612 }
 613
 614 static int dwc3_omap_suspend(struct device *dev)
 615 {
 616         struct dwc3_omap        *omap = dev_get_drvdata(dev);
 617
 618         omap->utmi_otg_status = dwc3_omap_read_utmi_status(omap);
 619
 620         return 0;
 621 }
 622
 623 static int dwc3_omap_resume(struct device *dev)
 624 {
 625         struct dwc3_omap        *omap = dev_get_drvdata(dev);
 626
 627         dwc3_omap_write_utmi_status(omap, omap->utmi_otg_status);
 628
 629         pm_runtime_disable(dev);
 630         pm_runtime_set_active(dev);
 631         pm_runtime_enable(dev);
 632
 633         return 0;
 634 }
 635
 636 static const struct dev_pm_ops dwc3_omap_dev_pm_ops = {
 637         .prepare        = dwc3_omap_prepare,
 638         .complete       = dwc3_omap_complete,
 639
 640         SET_SYSTEM_SLEEP_PM_OPS(dwc3_omap_suspend, dwc3_omap_resume)
 641 };
 642
 643 #define DEV_PM_OPS      (&dwc3_omap_dev_pm_ops)
 644 #else
 645 #define DEV_PM_OPS      NULL
 646 #endif /* CONFIG_PM_SLEEP */
 647
 648 static struct platform_driver dwc3_omap_driver = {
 649         .probe          = dwc3_omap_probe,
 650         .remove         = dwc3_omap_remove,
 651         .driver         = {
 652                 .name   = "omap-dwc3",
 653                 .of_match_table = of_dwc3_match,
 654                 .pm     = DEV_PM_OPS,
 655         },
 656 };
 657
 658 module_platform_driver(dwc3_omap_driver);
 659
 660 MODULE_ALIAS("platform:omap-dwc3");
 661 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 662 MODULE_LICENSE("GPL v2");
 663 MODULE_DESCRIPTION("DesignWare USB3 OMAP Glue Layer");