drivers/usb/gadget/udc/net2280.c

   1 /*
   2  * Driver for the PLX NET2280 USB device controller.
   3  * Specs and errata are available from <http://www.plxtech.com>.
   4  *
   5  * PLX Technology Inc. (formerly NetChip Technology) supported the
   6  * development of this driver.
   7  *
   8  *
   9  * CODE STATUS HIGHLIGHTS
  10  *
  11  * This driver should work well with most "gadget" drivers, including
  12  * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
  13  * as well as Gadget Zero and Gadgetfs.
  14  *
  15  * DMA is enabled by default.
  16  *
  17  * MSI is enabled by default.  The legacy IRQ is used if MSI couldn't
  18  * be enabled.
  19  *
  20  * Note that almost all the errata workarounds here are only needed for
  21  * rev1 chips.  Rev1a silicon (0110) fixes almost all of them.
  22  */
  23
  24 /*
  25  * Copyright (C) 2003 David Brownell
  26  * Copyright (C) 2003-2005 PLX Technology, Inc.
  27  * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
  28  *
  29  * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
  30  *      with 2282 chip
  31  *
  32  * Modified Ricardo Ribalda Qtechnology AS  to provide compatibility
  33  *      with usb 338x chip. Based on PLX driver
  34  *
  35  * This program is free software; you can redistribute it and/or modify
  36  * it under the terms of the GNU General Public License as published by
  37  * the Free Software Foundation; either version 2 of the License, or
  38  * (at your option) any later version.
  39  */
  40
  41 #include <linux/module.h>
  42 #include <linux/pci.h>
  43 #include <linux/dma-mapping.h>
  44 #include <linux/kernel.h>
  45 #include <linux/delay.h>
  46 #include <linux/ioport.h>
  47 #include <linux/slab.h>
  48 #include <linux/errno.h>
  49 #include <linux/init.h>
  50 #include <linux/timer.h>
  51 #include <linux/list.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/moduleparam.h>
  54 #include <linux/device.h>
  55 #include <linux/usb/ch9.h>
  56 #include <linux/usb/gadget.h>
  57 #include <linux/prefetch.h>
  58 #include <linux/io.h>
  59
  60 #include <asm/byteorder.h>
  61 #include <asm/irq.h>
  62 #include <asm/unaligned.h>
  63
  64 #define DRIVER_DESC             "PLX NET228x/USB338x USB Peripheral Controller"
  65 #define DRIVER_VERSION          "2005 Sept 27/v3.0"
  66
  67 #define EP_DONTUSE              13      /* nonzero */
  68
  69 #define USE_RDK_LEDS            /* GPIO pins control three LEDs */
  70
  71
  72 static const char driver_name[] = "net2280";
  73 static const char driver_desc[] = DRIVER_DESC;
  74
  75 static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
  76 static const char ep0name[] = "ep0";
  77
  78 #define EP_INFO(_name, _caps) \
  79         { \
  80                 .name = _name, \
  81                 .caps = _caps, \
  82         }
  83
  84 static const struct {
  85         const char *name;
  86         const struct usb_ep_caps caps;
  87 } ep_info_dft[] = { /* Default endpoint configuration */
  88         EP_INFO(ep0name,
  89                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
  90         EP_INFO("ep-a",
  91                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  92         EP_INFO("ep-b",
  93                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  94         EP_INFO("ep-c",
  95                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  96         EP_INFO("ep-d",
  97                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  98         EP_INFO("ep-e",
  99                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 100         EP_INFO("ep-f",
 101                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 102         EP_INFO("ep-g",
 103                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 104         EP_INFO("ep-h",
 105                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 106 }, ep_info_adv[] = { /* Endpoints for usb3380 advance mode */
 107         EP_INFO(ep0name,
 108                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
 109         EP_INFO("ep1in",
 110                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 111         EP_INFO("ep2out",
 112                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 113         EP_INFO("ep3in",
 114                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 115         EP_INFO("ep4out",
 116                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 117         EP_INFO("ep1out",
 118                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 119         EP_INFO("ep2in",
 120                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 121         EP_INFO("ep3out",
 122                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 123         EP_INFO("ep4in",
 124                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 125 };
 126
 127 #undef EP_INFO
 128
 129 /* mode 0 == ep-{a,b,c,d} 1K fifo each
 130  * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
 131  * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
 132  */
 133 static ushort fifo_mode;
 134
 135 /* "modprobe net2280 fifo_mode=1" etc */
 136 module_param(fifo_mode, ushort, 0644);
 137
 138 /* enable_suspend -- When enabled, the driver will respond to
 139  * USB suspend requests by powering down the NET2280.  Otherwise,
 140  * USB suspend requests will be ignored.  This is acceptable for
 141  * self-powered devices
 142  */
 143 static bool enable_suspend;
 144
 145 /* "modprobe net2280 enable_suspend=1" etc */
 146 module_param(enable_suspend, bool, 0444);
 147
 148 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
 149
 150 static char *type_string(u8 bmAttributes)
 151 {
 152         switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
 153         case USB_ENDPOINT_XFER_BULK:    return "bulk";
 154         case USB_ENDPOINT_XFER_ISOC:    return "iso";
 155         case USB_ENDPOINT_XFER_INT:     return "intr";
 156         }
 157         return "control";
 158 }
 159
 160 #include "net2280.h"
 161
 162 #define valid_bit       cpu_to_le32(BIT(VALID_BIT))
 163 #define dma_done_ie     cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
 164
 165 static void ep_clear_seqnum(struct net2280_ep *ep);
 166 static void stop_activity(struct net2280 *dev,
 167                                         struct usb_gadget_driver *driver);
 168 static void ep0_start(struct net2280 *dev);
 169
 170 /*-------------------------------------------------------------------------*/
 171 static inline void enable_pciirqenb(struct net2280_ep *ep)
 172 {
 173         u32 tmp = readl(&ep->dev->regs->pciirqenb0);
 174
 175         if (ep->dev->quirks & PLX_LEGACY)
 176                 tmp |= BIT(ep->num);
 177         else
 178                 tmp |= BIT(ep_bit[ep->num]);
 179         writel(tmp, &ep->dev->regs->pciirqenb0);
 180
 181         return;
 182 }
 183
 184 static int
 185 net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 186 {
 187         struct net2280          *dev;
 188         struct net2280_ep       *ep;
 189         u32                     max;
 190         u32 tmp = 0;
 191         u32 type;
 192         unsigned long           flags;
 193         static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
 194         int ret = 0;
 195
 196         ep = container_of(_ep, struct net2280_ep, ep);
 197         if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
 198                         desc->bDescriptorType != USB_DT_ENDPOINT) {
 199                 pr_err("%s: failed at line=%d\n", __func__, __LINE__);
 200                 return -EINVAL;
 201         }
 202         dev = ep->dev;
 203         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 204                 ret = -ESHUTDOWN;
 205                 goto print_err;
 206         }
 207
 208         /* erratum 0119 workaround ties up an endpoint number */
 209         if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
 210                 ret = -EDOM;
 211                 goto print_err;
 212         }
 213
 214         if (dev->quirks & PLX_PCIE) {
 215                 if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
 216                         ret = -EDOM;
 217                         goto print_err;
 218                 }
 219                 ep->is_in = !!usb_endpoint_dir_in(desc);
 220                 if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
 221                         ret = -EINVAL;
 222                         goto print_err;
 223                 }
 224         }
 225
 226         /* sanity check ep-e/ep-f since their fifos are small */
 227         max = usb_endpoint_maxp(desc);
 228         if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
 229                 ret = -ERANGE;
 230                 goto print_err;
 231         }
 232
 233         spin_lock_irqsave(&dev->lock, flags);
 234         _ep->maxpacket = max;
 235         ep->desc = desc;
 236
 237         /* ep_reset() has already been called */
 238         ep->stopped = 0;
 239         ep->wedged = 0;
 240         ep->out_overflow = 0;
 241
 242         /* set speed-dependent max packet; may kick in high bandwidth */
 243         set_max_speed(ep, max);
 244
 245         /* set type, direction, address; reset fifo counters */
 246         writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
 247
 248         if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
 249                 tmp = readl(&ep->cfg->ep_cfg);
 250                 /* If USB ep number doesn't match hardware ep number */
 251                 if ((tmp & 0xf) != usb_endpoint_num(desc)) {
 252                         ret = -EINVAL;
 253                         spin_unlock_irqrestore(&dev->lock, flags);
 254                         goto print_err;
 255                 }
 256                 if (ep->is_in)
 257                         tmp &= ~USB3380_EP_CFG_MASK_IN;
 258                 else
 259                         tmp &= ~USB3380_EP_CFG_MASK_OUT;
 260         }
 261         type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 262         if (type == USB_ENDPOINT_XFER_INT) {
 263                 /* erratum 0105 workaround prevents hs NYET */
 264                 if (dev->chiprev == 0100 &&
 265                                 dev->gadget.speed == USB_SPEED_HIGH &&
 266                                 !(desc->bEndpointAddress & USB_DIR_IN))
 267                         writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
 268                                 &ep->regs->ep_rsp);
 269         } else if (type == USB_ENDPOINT_XFER_BULK) {
 270                 /* catch some particularly blatant driver bugs */
 271                 if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
 272                     (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
 273                     (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
 274                         spin_unlock_irqrestore(&dev->lock, flags);
 275                         ret = -ERANGE;
 276                         goto print_err;
 277                 }
 278         }
 279         ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC);
 280         /* Enable this endpoint */
 281         if (dev->quirks & PLX_LEGACY) {
 282                 tmp |= type << ENDPOINT_TYPE;
 283                 tmp |= desc->bEndpointAddress;
 284                 /* default full fifo lines */
 285                 tmp |= (4 << ENDPOINT_BYTE_COUNT);
 286                 tmp |= BIT(ENDPOINT_ENABLE);
 287                 ep->is_in = (tmp & USB_DIR_IN) != 0;
 288         } else {
 289                 /* In Legacy mode, only OUT endpoints are used */
 290                 if (dev->enhanced_mode && ep->is_in) {
 291                         tmp |= type << IN_ENDPOINT_TYPE;
 292                         tmp |= BIT(IN_ENDPOINT_ENABLE);
 293                 } else {
 294                         tmp |= type << OUT_ENDPOINT_TYPE;
 295                         tmp |= BIT(OUT_ENDPOINT_ENABLE);
 296                         tmp |= (ep->is_in << ENDPOINT_DIRECTION);
 297                 }
 298
 299                 tmp |= (4 << ENDPOINT_BYTE_COUNT);
 300                 if (!dev->enhanced_mode)
 301                         tmp |= usb_endpoint_num(desc);
 302                 tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
 303         }
 304
 305         /* Make sure all the registers are written before ep_rsp*/
 306         wmb();
 307
 308         /* for OUT transfers, block the rx fifo until a read is posted */
 309         if (!ep->is_in)
 310                 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 311         else if (!(dev->quirks & PLX_2280)) {
 312                 /* Added for 2282, Don't use nak packets on an in endpoint,
 313                  * this was ignored on 2280
 314                  */
 315                 writel(BIT(CLEAR_NAK_OUT_PACKETS) |
 316                         BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
 317         }
 318
 319         if (dev->quirks & PLX_PCIE)
 320                 ep_clear_seqnum(ep);
 321         writel(tmp, &ep->cfg->ep_cfg);
 322
 323         /* enable irqs */
 324         if (!ep->dma) {                         /* pio, per-packet */
 325                 enable_pciirqenb(ep);
 326
 327                 tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
 328                         BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
 329                 if (dev->quirks & PLX_2280)
 330                         tmp |= readl(&ep->regs->ep_irqenb);
 331                 writel(tmp, &ep->regs->ep_irqenb);
 332         } else {                                /* dma, per-request */
 333                 tmp = BIT((8 + ep->num));       /* completion */
 334                 tmp |= readl(&dev->regs->pciirqenb1);
 335                 writel(tmp, &dev->regs->pciirqenb1);
 336
 337                 /* for short OUT transfers, dma completions can't
 338                  * advance the queue; do it pio-style, by hand.
 339                  * NOTE erratum 0112 workaround #2
 340                  */
 341                 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
 342                         tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
 343                         writel(tmp, &ep->regs->ep_irqenb);
 344
 345                         enable_pciirqenb(ep);
 346                 }
 347         }
 348
 349         tmp = desc->bEndpointAddress;
 350         ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
 351                 _ep->name, tmp & 0x0f, DIR_STRING(tmp),
 352                 type_string(desc->bmAttributes),
 353                 ep->dma ? "dma" : "pio", max);
 354
 355         /* pci writes may still be posted */
 356         spin_unlock_irqrestore(&dev->lock, flags);
 357         return ret;
 358
 359 print_err:
 360         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
 361         return ret;
 362 }
 363
 364 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
 365 {
 366         u32     result;
 367
 368         do {
 369                 result = readl(ptr);
 370                 if (result == ~(u32)0)          /* "device unplugged" */
 371                         return -ENODEV;
 372                 result &= mask;
 373                 if (result == done)
 374                         return 0;
 375                 udelay(1);
 376                 usec--;
 377         } while (usec > 0);
 378         return -ETIMEDOUT;
 379 }
 380
 381 static const struct usb_ep_ops net2280_ep_ops;
 382
 383 static void ep_reset_228x(struct net2280_regs __iomem *regs,
 384                           struct net2280_ep *ep)
 385 {
 386         u32             tmp;
 387
 388         ep->desc = NULL;
 389         INIT_LIST_HEAD(&ep->queue);
 390
 391         usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 392         ep->ep.ops = &net2280_ep_ops;
 393
 394         /* disable the dma, irqs, endpoint... */
 395         if (ep->dma) {
 396                 writel(0, &ep->dma->dmactl);
 397                 writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 398                         BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
 399                         BIT(DMA_ABORT),
 400                         &ep->dma->dmastat);
 401
 402                 tmp = readl(&regs->pciirqenb0);
 403                 tmp &= ~BIT(ep->num);
 404                 writel(tmp, &regs->pciirqenb0);
 405         } else {
 406                 tmp = readl(&regs->pciirqenb1);
 407                 tmp &= ~BIT((8 + ep->num));     /* completion */
 408                 writel(tmp, &regs->pciirqenb1);
 409         }
 410         writel(0, &ep->regs->ep_irqenb);
 411
 412         /* init to our chosen defaults, notably so that we NAK OUT
 413          * packets until the driver queues a read (+note erratum 0112)
 414          */
 415         if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
 416                 tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
 417                 BIT(SET_NAK_OUT_PACKETS) |
 418                 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 419                 BIT(CLEAR_INTERRUPT_MODE);
 420         } else {
 421                 /* added for 2282 */
 422                 tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
 423                 BIT(CLEAR_NAK_OUT_PACKETS) |
 424                 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 425                 BIT(CLEAR_INTERRUPT_MODE);
 426         }
 427
 428         if (ep->num != 0) {
 429                 tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
 430                         BIT(CLEAR_ENDPOINT_HALT);
 431         }
 432         writel(tmp, &ep->regs->ep_rsp);
 433
 434         /* scrub most status bits, and flush any fifo state */
 435         if (ep->dev->quirks & PLX_2280)
 436                 tmp = BIT(FIFO_OVERFLOW) |
 437                         BIT(FIFO_UNDERFLOW);
 438         else
 439                 tmp = 0;
 440
 441         writel(tmp | BIT(TIMEOUT) |
 442                 BIT(USB_STALL_SENT) |
 443                 BIT(USB_IN_NAK_SENT) |
 444                 BIT(USB_IN_ACK_RCVD) |
 445                 BIT(USB_OUT_PING_NAK_SENT) |
 446                 BIT(USB_OUT_ACK_SENT) |
 447                 BIT(FIFO_FLUSH) |
 448                 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 449                 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 450                 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 451                 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 452                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 453                 BIT(DATA_IN_TOKEN_INTERRUPT),
 454                 &ep->regs->ep_stat);
 455
 456         /* fifo size is handled separately */
 457 }
 458
 459 static void ep_reset_338x(struct net2280_regs __iomem *regs,
 460                                         struct net2280_ep *ep)
 461 {
 462         u32 tmp, dmastat;
 463
 464         ep->desc = NULL;
 465         INIT_LIST_HEAD(&ep->queue);
 466
 467         usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 468         ep->ep.ops = &net2280_ep_ops;
 469
 470         /* disable the dma, irqs, endpoint... */
 471         if (ep->dma) {
 472                 writel(0, &ep->dma->dmactl);
 473                 writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
 474                        BIT(DMA_PAUSE_DONE_INTERRUPT) |
 475                        BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 476                        BIT(DMA_TRANSACTION_DONE_INTERRUPT),
 477                        /* | BIT(DMA_ABORT), */
 478                        &ep->dma->dmastat);
 479
 480                 dmastat = readl(&ep->dma->dmastat);
 481                 if (dmastat == 0x5002) {
 482                         ep_warn(ep->dev, "The dmastat return = %x!!\n",
 483                                dmastat);
 484                         writel(0x5a, &ep->dma->dmastat);
 485                 }
 486
 487                 tmp = readl(&regs->pciirqenb0);
 488                 tmp &= ~BIT(ep_bit[ep->num]);
 489                 writel(tmp, &regs->pciirqenb0);
 490         } else {
 491                 if (ep->num < 5) {
 492                         tmp = readl(&regs->pciirqenb1);
 493                         tmp &= ~BIT((8 + ep->num));     /* completion */
 494                         writel(tmp, &regs->pciirqenb1);
 495                 }
 496         }
 497         writel(0, &ep->regs->ep_irqenb);
 498
 499         writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 500                BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 501                BIT(FIFO_OVERFLOW) |
 502                BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 503                BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 504                BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 505                BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
 506
 507         tmp = readl(&ep->cfg->ep_cfg);
 508         if (ep->is_in)
 509                 tmp &= ~USB3380_EP_CFG_MASK_IN;
 510         else
 511                 tmp &= ~USB3380_EP_CFG_MASK_OUT;
 512         writel(tmp, &ep->cfg->ep_cfg);
 513 }
 514
 515 static void nuke(struct net2280_ep *);
 516
 517 static int net2280_disable(struct usb_ep *_ep)
 518 {
 519         struct net2280_ep       *ep;
 520         unsigned long           flags;
 521
 522         ep = container_of(_ep, struct net2280_ep, ep);
 523         if (!_ep || !ep->desc || _ep->name == ep0name) {
 524                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
 525                 return -EINVAL;
 526         }
 527         spin_lock_irqsave(&ep->dev->lock, flags);
 528         nuke(ep);
 529
 530         if (ep->dev->quirks & PLX_PCIE)
 531                 ep_reset_338x(ep->dev->regs, ep);
 532         else
 533                 ep_reset_228x(ep->dev->regs, ep);
 534
 535         ep_vdbg(ep->dev, "disabled %s %s\n",
 536                         ep->dma ? "dma" : "pio", _ep->name);
 537
 538         /* synch memory views with the device */
 539         (void)readl(&ep->cfg->ep_cfg);
 540
 541         if (!ep->dma && ep->num >= 1 && ep->num <= 4)
 542                 ep->dma = &ep->dev->dma[ep->num - 1];
 543
 544         spin_unlock_irqrestore(&ep->dev->lock, flags);
 545         return 0;
 546 }
 547
 548 /*-------------------------------------------------------------------------*/
 549
 550 static struct usb_request
 551 *net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 552 {
 553         struct net2280_ep       *ep;
 554         struct net2280_request  *req;
 555
 556         if (!_ep) {
 557                 pr_err("%s: Invalid ep\n", __func__);
 558                 return NULL;
 559         }
 560         ep = container_of(_ep, struct net2280_ep, ep);
 561
 562         req = kzalloc(sizeof(*req), gfp_flags);
 563         if (!req)
 564                 return NULL;
 565
 566         INIT_LIST_HEAD(&req->queue);
 567
 568         /* this dma descriptor may be swapped with the previous dummy */
 569         if (ep->dma) {
 570                 struct net2280_dma      *td;
 571
 572                 td = pci_pool_alloc(ep->dev->requests, gfp_flags,
 573                                 &req->td_dma);
 574                 if (!td) {
 575                         kfree(req);
 576                         return NULL;
 577                 }
 578                 td->dmacount = 0;       /* not VALID */
 579                 td->dmadesc = td->dmaaddr;
 580                 req->td = td;
 581         }
 582         return &req->req;
 583 }
 584
 585 static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
 586 {
 587         struct net2280_ep       *ep;
 588         struct net2280_request  *req;
 589
 590         ep = container_of(_ep, struct net2280_ep, ep);
 591         if (!_ep || !_req) {
 592                 dev_err(&ep->dev->pdev->dev, "%s: Invalid ep=%p or req=%p\n",
 593                                                         __func__, _ep, _req);
 594                 return;
 595         }
 596
 597         req = container_of(_req, struct net2280_request, req);
 598         WARN_ON(!list_empty(&req->queue));
 599         if (req->td)
 600                 pci_pool_free(ep->dev->requests, req->td, req->td_dma);
 601         kfree(req);
 602 }
 603
 604 /*-------------------------------------------------------------------------*/
 605
 606 /* load a packet into the fifo we use for usb IN transfers.
 607  * works for all endpoints.
 608  *
 609  * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
 610  * at a time, but this code is simpler because it knows it only writes
 611  * one packet.  ep-a..ep-d should use dma instead.
 612  */
 613 static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
 614 {
 615         struct net2280_ep_regs  __iomem *regs = ep->regs;
 616         u8                      *buf;
 617         u32                     tmp;
 618         unsigned                count, total;
 619
 620         /* INVARIANT:  fifo is currently empty. (testable) */
 621
 622         if (req) {
 623                 buf = req->buf + req->actual;
 624                 prefetch(buf);
 625                 total = req->length - req->actual;
 626         } else {
 627                 total = 0;
 628                 buf = NULL;
 629         }
 630
 631         /* write just one packet at a time */
 632         count = ep->ep.maxpacket;
 633         if (count > total)      /* min() cannot be used on a bitfield */
 634                 count = total;
 635
 636         ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
 637                         ep->ep.name, count,
 638                         (count != ep->ep.maxpacket) ? " (short)" : "",
 639                         req);
 640         while (count >= 4) {
 641                 /* NOTE be careful if you try to align these. fifo lines
 642                  * should normally be full (4 bytes) and successive partial
 643                  * lines are ok only in certain cases.
 644                  */
 645                 tmp = get_unaligned((u32 *)buf);
 646                 cpu_to_le32s(&tmp);
 647                 writel(tmp, &regs->ep_data);
 648                 buf += 4;
 649                 count -= 4;
 650         }
 651
 652         /* last fifo entry is "short" unless we wrote a full packet.
 653          * also explicitly validate last word in (periodic) transfers
 654          * when maxpacket is not a multiple of 4 bytes.
 655          */
 656         if (count || total < ep->ep.maxpacket) {
 657                 tmp = count ? get_unaligned((u32 *)buf) : count;
 658                 cpu_to_le32s(&tmp);
 659                 set_fifo_bytecount(ep, count & 0x03);
 660                 writel(tmp, &regs->ep_data);
 661         }
 662
 663         /* pci writes may still be posted */
 664 }
 665
 666 /* work around erratum 0106: PCI and USB race over the OUT fifo.
 667  * caller guarantees chiprev 0100, out endpoint is NAKing, and
 668  * there's no real data in the fifo.
 669  *
 670  * NOTE:  also used in cases where that erratum doesn't apply:
 671  * where the host wrote "too much" data to us.
 672  */
 673 static void out_flush(struct net2280_ep *ep)
 674 {
 675         u32     __iomem *statp;
 676         u32     tmp;
 677
 678         statp = &ep->regs->ep_stat;
 679
 680         tmp = readl(statp);
 681         if (tmp & BIT(NAK_OUT_PACKETS)) {
 682                 ep_dbg(ep->dev, "%s %s %08x !NAK\n",
 683                         ep->ep.name, __func__, tmp);
 684                 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 685         }
 686
 687         writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 688                 BIT(DATA_PACKET_RECEIVED_INTERRUPT),
 689                 statp);
 690         writel(BIT(FIFO_FLUSH), statp);
 691         /* Make sure that stap is written */
 692         mb();
 693         tmp = readl(statp);
 694         if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
 695                         /* high speed did bulk NYET; fifo isn't filling */
 696                         ep->dev->gadget.speed == USB_SPEED_FULL) {
 697                 unsigned        usec;
 698
 699                 usec = 50;              /* 64 byte bulk/interrupt */
 700                 handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
 701                                 BIT(USB_OUT_PING_NAK_SENT), usec);
 702                 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
 703         }
 704 }
 705
 706 /* unload packet(s) from the fifo we use for usb OUT transfers.
 707  * returns true iff the request completed, because of short packet
 708  * or the request buffer having filled with full packets.
 709  *
 710  * for ep-a..ep-d this will read multiple packets out when they
 711  * have been accepted.
 712  */
 713 static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
 714 {
 715         struct net2280_ep_regs  __iomem *regs = ep->regs;
 716         u8                      *buf = req->req.buf + req->req.actual;
 717         unsigned                count, tmp, is_short;
 718         unsigned                cleanup = 0, prevent = 0;
 719
 720         /* erratum 0106 ... packets coming in during fifo reads might
 721          * be incompletely rejected.  not all cases have workarounds.
 722          */
 723         if (ep->dev->chiprev == 0x0100 &&
 724                         ep->dev->gadget.speed == USB_SPEED_FULL) {
 725                 udelay(1);
 726                 tmp = readl(&ep->regs->ep_stat);
 727                 if ((tmp & BIT(NAK_OUT_PACKETS)))
 728                         cleanup = 1;
 729                 else if ((tmp & BIT(FIFO_FULL))) {
 730                         start_out_naking(ep);
 731                         prevent = 1;
 732                 }
 733                 /* else: hope we don't see the problem */
 734         }
 735
 736         /* never overflow the rx buffer. the fifo reads packets until
 737          * it sees a short one; we might not be ready for them all.
 738          */
 739         prefetchw(buf);
 740         count = readl(&regs->ep_avail);
 741         if (unlikely(count == 0)) {
 742                 udelay(1);
 743                 tmp = readl(&ep->regs->ep_stat);
 744                 count = readl(&regs->ep_avail);
 745                 /* handled that data already? */
 746                 if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
 747                         return 0;
 748         }
 749
 750         tmp = req->req.length - req->req.actual;
 751         if (count > tmp) {
 752                 /* as with DMA, data overflow gets flushed */
 753                 if ((tmp % ep->ep.maxpacket) != 0) {
 754                         ep_err(ep->dev,
 755                                 "%s out fifo %d bytes, expected %d\n",
 756                                 ep->ep.name, count, tmp);
 757                         req->req.status = -EOVERFLOW;
 758                         cleanup = 1;
 759                         /* NAK_OUT_PACKETS will be set, so flushing is safe;
 760                          * the next read will start with the next packet
 761                          */
 762                 } /* else it's a ZLP, no worries */
 763                 count = tmp;
 764         }
 765         req->req.actual += count;
 766
 767         is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
 768
 769         ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
 770                         ep->ep.name, count, is_short ? " (short)" : "",
 771                         cleanup ? " flush" : "", prevent ? " nak" : "",
 772                         req, req->req.actual, req->req.length);
 773
 774         while (count >= 4) {
 775                 tmp = readl(&regs->ep_data);
 776                 cpu_to_le32s(&tmp);
 777                 put_unaligned(tmp, (u32 *)buf);
 778                 buf += 4;
 779                 count -= 4;
 780         }
 781         if (count) {
 782                 tmp = readl(&regs->ep_data);
 783                 /* LE conversion is implicit here: */
 784                 do {
 785                         *buf++ = (u8) tmp;
 786                         tmp >>= 8;
 787                 } while (--count);
 788         }
 789         if (cleanup)
 790                 out_flush(ep);
 791         if (prevent) {
 792                 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 793                 (void) readl(&ep->regs->ep_rsp);
 794         }
 795
 796         return is_short || ((req->req.actual == req->req.length) &&
 797                         !req->req.zero);
 798 }
 799
 800 /* fill out dma descriptor to match a given request */
 801 static void fill_dma_desc(struct net2280_ep *ep,
 802                                         struct net2280_request *req, int valid)
 803 {
 804         struct net2280_dma      *td = req->td;
 805         u32                     dmacount = req->req.length;
 806
 807         /* don't let DMA continue after a short OUT packet,
 808          * so overruns can't affect the next transfer.
 809          * in case of overruns on max-size packets, we can't
 810          * stop the fifo from filling but we can flush it.
 811          */
 812         if (ep->is_in)
 813                 dmacount |= BIT(DMA_DIRECTION);
 814         if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
 815                                         !(ep->dev->quirks & PLX_2280))
 816                 dmacount |= BIT(END_OF_CHAIN);
 817
 818         req->valid = valid;
 819         if (valid)
 820                 dmacount |= BIT(VALID_BIT);
 821         dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
 822
 823         /* td->dmadesc = previously set by caller */
 824         td->dmaaddr = cpu_to_le32 (req->req.dma);
 825
 826         /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
 827         wmb();
 828         td->dmacount = cpu_to_le32(dmacount);
 829 }
 830
 831 static const u32 dmactl_default =
 832                 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 833                 BIT(DMA_CLEAR_COUNT_ENABLE) |
 834                 /* erratum 0116 workaround part 1 (use POLLING) */
 835                 (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
 836                 BIT(DMA_VALID_BIT_POLLING_ENABLE) |
 837                 BIT(DMA_VALID_BIT_ENABLE) |
 838                 BIT(DMA_SCATTER_GATHER_ENABLE) |
 839                 /* erratum 0116 workaround part 2 (no AUTOSTART) */
 840                 BIT(DMA_ENABLE);
 841
 842 static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
 843 {
 844         handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
 845 }
 846
 847 static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
 848 {
 849         writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
 850         spin_stop_dma(dma);
 851 }
 852
 853 static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
 854 {
 855         struct net2280_dma_regs __iomem *dma = ep->dma;
 856         unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
 857
 858         if (!(ep->dev->quirks & PLX_2280))
 859                 tmp |= BIT(END_OF_CHAIN);
 860
 861         writel(tmp, &dma->dmacount);
 862         writel(readl(&dma->dmastat), &dma->dmastat);
 863
 864         writel(td_dma, &dma->dmadesc);
 865         if (ep->dev->quirks & PLX_PCIE)
 866                 dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
 867         writel(dmactl, &dma->dmactl);
 868
 869         /* erratum 0116 workaround part 3:  pci arbiter away from net2280 */
 870         (void) readl(&ep->dev->pci->pcimstctl);
 871
 872         writel(BIT(DMA_START), &dma->dmastat);
 873
 874         if (!ep->is_in)
 875                 stop_out_naking(ep);
 876 }
 877
 878 static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
 879 {
 880         u32                     tmp;
 881         struct net2280_dma_regs __iomem *dma = ep->dma;
 882
 883         /* FIXME can't use DMA for ZLPs */
 884
 885         /* on this path we "know" there's no dma active (yet) */
 886         WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
 887         writel(0, &ep->dma->dmactl);
 888
 889         /* previous OUT packet might have been short */
 890         if (!ep->is_in && (readl(&ep->regs->ep_stat) &
 891                                 BIT(NAK_OUT_PACKETS))) {
 892                 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
 893                         &ep->regs->ep_stat);
 894
 895                 tmp = readl(&ep->regs->ep_avail);
 896                 if (tmp) {
 897                         writel(readl(&dma->dmastat), &dma->dmastat);
 898
 899                         /* transfer all/some fifo data */
 900                         writel(req->req.dma, &dma->dmaaddr);
 901                         tmp = min(tmp, req->req.length);
 902
 903                         /* dma irq, faking scatterlist status */
 904                         req->td->dmacount = cpu_to_le32(req->req.length - tmp);
 905                         writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
 906                                         &dma->dmacount);
 907                         req->td->dmadesc = 0;
 908                         req->valid = 1;
 909
 910                         writel(BIT(DMA_ENABLE), &dma->dmactl);
 911                         writel(BIT(DMA_START), &dma->dmastat);
 912                         return;
 913                 }
 914         }
 915
 916         tmp = dmactl_default;
 917
 918         /* force packet boundaries between dma requests, but prevent the
 919          * controller from automagically writing a last "short" packet
 920          * (zero length) unless the driver explicitly said to do that.
 921          */
 922         if (ep->is_in) {
 923                 if (likely((req->req.length % ep->ep.maxpacket) ||
 924                                                         req->req.zero)){
 925                         tmp |= BIT(DMA_FIFO_VALIDATE);
 926                         ep->in_fifo_validate = 1;
 927                 } else
 928                         ep->in_fifo_validate = 0;
 929         }
 930
 931         /* init req->td, pointing to the current dummy */
 932         req->td->dmadesc = cpu_to_le32 (ep->td_dma);
 933         fill_dma_desc(ep, req, 1);
 934
 935         req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
 936
 937         start_queue(ep, tmp, req->td_dma);
 938 }
 939
 940 static inline void
 941 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
 942 {
 943         struct net2280_dma      *end;
 944         dma_addr_t              tmp;
 945
 946         /* swap new dummy for old, link; fill and maybe activate */
 947         end = ep->dummy;
 948         ep->dummy = req->td;
 949         req->td = end;
 950
 951         tmp = ep->td_dma;
 952         ep->td_dma = req->td_dma;
 953         req->td_dma = tmp;
 954
 955         end->dmadesc = cpu_to_le32 (ep->td_dma);
 956
 957         fill_dma_desc(ep, req, valid);
 958 }
 959
 960 static void
 961 done(struct net2280_ep *ep, struct net2280_request *req, int status)
 962 {
 963         struct net2280          *dev;
 964         unsigned                stopped = ep->stopped;
 965
 966         list_del_init(&req->queue);
 967
 968         if (req->req.status == -EINPROGRESS)
 969                 req->req.status = status;
 970         else
 971                 status = req->req.status;
 972
 973         dev = ep->dev;
 974         if (ep->dma)
 975                 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
 976
 977         if (status && status != -ESHUTDOWN)
 978                 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
 979                         ep->ep.name, &req->req, status,
 980                         req->req.actual, req->req.length);
 981
 982         /* don't modify queue heads during completion callback */
 983         ep->stopped = 1;
 984         spin_unlock(&dev->lock);
 985         usb_gadget_giveback_request(&ep->ep, &req->req);
 986         spin_lock(&dev->lock);
 987         ep->stopped = stopped;
 988 }
 989
 990 /*-------------------------------------------------------------------------*/
 991
 992 static int
 993 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 994 {
 995         struct net2280_request  *req;
 996         struct net2280_ep       *ep;
 997         struct net2280          *dev;
 998         unsigned long           flags;
 999         int ret = 0;
1000
1001         /* we always require a cpu-view buffer, so that we can
1002          * always use pio (as fallback or whatever).
1003          */
1004         ep = container_of(_ep, struct net2280_ep, ep);
1005         if (!_ep || (!ep->desc && ep->num != 0)) {
1006                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1007                 return -EINVAL;
1008         }
1009         req = container_of(_req, struct net2280_request, req);
1010         if (!_req || !_req->complete || !_req->buf ||
1011                                 !list_empty(&req->queue)) {
1012                 ret = -EINVAL;
1013                 goto print_err;
1014         }
1015         if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
1016                 ret = -EDOM;
1017                 goto print_err;
1018         }
1019         dev = ep->dev;
1020         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1021                 ret = -ESHUTDOWN;
1022                 goto print_err;
1023         }
1024
1025         /* FIXME implement PIO fallback for ZLPs with DMA */
1026         if (ep->dma && _req->length == 0) {
1027                 ret = -EOPNOTSUPP;
1028                 goto print_err;
1029         }
1030
1031         /* set up dma mapping in case the caller didn't */
1032         if (ep->dma) {
1033                 ret = usb_gadget_map_request(&dev->gadget, _req,
1034                                 ep->is_in);
1035                 if (ret)
1036                         goto print_err;
1037         }
1038
1039         ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
1040                         _ep->name, _req, _req->length, _req->buf);
1041
1042         spin_lock_irqsave(&dev->lock, flags);
1043
1044         _req->status = -EINPROGRESS;
1045         _req->actual = 0;
1046
1047         /* kickstart this i/o queue? */
1048         if  (list_empty(&ep->queue) && !ep->stopped &&
1049                 !((dev->quirks & PLX_PCIE) && ep->dma &&
1050                   (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1051
1052                 /* use DMA if the endpoint supports it, else pio */
1053                 if (ep->dma)
1054                         start_dma(ep, req);
1055                 else {
1056                         /* maybe there's no control data, just status ack */
1057                         if (ep->num == 0 && _req->length == 0) {
1058                                 allow_status(ep);
1059                                 done(ep, req, 0);
1060                                 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1061                                 goto done;
1062                         }
1063
1064                         /* PIO ... stuff the fifo, or unblock it.  */
1065                         if (ep->is_in)
1066                                 write_fifo(ep, _req);
1067                         else if (list_empty(&ep->queue)) {
1068                                 u32     s;
1069
1070                                 /* OUT FIFO might have packet(s) buffered */
1071                                 s = readl(&ep->regs->ep_stat);
1072                                 if ((s & BIT(FIFO_EMPTY)) == 0) {
1073                                         /* note:  _req->short_not_ok is
1074                                          * ignored here since PIO _always_
1075                                          * stops queue advance here, and
1076                                          * _req->status doesn't change for
1077                                          * short reads (only _req->actual)
1078                                          */
1079                                         if (read_fifo(ep, req) &&
1080                                                         ep->num == 0) {
1081                                                 done(ep, req, 0);
1082                                                 allow_status(ep);
1083                                                 /* don't queue it */
1084                                                 req = NULL;
1085                                         } else if (read_fifo(ep, req) &&
1086                                                         ep->num != 0) {
1087                                                 done(ep, req, 0);
1088                                                 req = NULL;
1089                                         } else
1090                                                 s = readl(&ep->regs->ep_stat);
1091                                 }
1092
1093                                 /* don't NAK, let the fifo fill */
1094                                 if (req && (s & BIT(NAK_OUT_PACKETS)))
1095                                         writel(BIT(CLEAR_NAK_OUT_PACKETS),
1096                                                         &ep->regs->ep_rsp);
1097                         }
1098                 }
1099
1100         } else if (ep->dma) {
1101                 int     valid = 1;
1102
1103                 if (ep->is_in) {
1104                         int     expect;
1105
1106                         /* preventing magic zlps is per-engine state, not
1107                          * per-transfer; irq logic must recover hiccups.
1108                          */
1109                         expect = likely(req->req.zero ||
1110                                 (req->req.length % ep->ep.maxpacket));
1111                         if (expect != ep->in_fifo_validate)
1112                                 valid = 0;
1113                 }
1114                 queue_dma(ep, req, valid);
1115
1116         } /* else the irq handler advances the queue. */
1117
1118         ep->responded = 1;
1119         if (req)
1120                 list_add_tail(&req->queue, &ep->queue);
1121 done:
1122         spin_unlock_irqrestore(&dev->lock, flags);
1123
1124         /* pci writes may still be posted */
1125         return ret;
1126
1127 print_err:
1128         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1129         return ret;
1130 }
1131
1132 static inline void
1133 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1134                 int status)
1135 {
1136         req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1137         done(ep, req, status);
1138 }
1139
1140 static int scan_dma_completions(struct net2280_ep *ep)
1141 {
1142         int num_completed = 0;
1143
1144         /* only look at descriptors that were "naturally" retired,
1145          * so fifo and list head state won't matter
1146          */
1147         while (!list_empty(&ep->queue)) {
1148                 struct net2280_request  *req;
1149                 u32 req_dma_count;
1150
1151                 req = list_entry(ep->queue.next,
1152                                 struct net2280_request, queue);
1153                 if (!req->valid)
1154                         break;
1155                 rmb();
1156                 req_dma_count = le32_to_cpup(&req->td->dmacount);
1157                 if ((req_dma_count & BIT(VALID_BIT)) != 0)
1158                         break;
1159
1160                 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1161                  * cases where DMA must be aborted; this code handles
1162                  * all non-abort DMA completions.
1163                  */
1164                 if (unlikely(req->td->dmadesc == 0)) {
1165                         /* paranoia */
1166                         u32 const ep_dmacount = readl(&ep->dma->dmacount);
1167
1168                         if (ep_dmacount & DMA_BYTE_COUNT_MASK)
1169                                 break;
1170                         /* single transfer mode */
1171                         dma_done(ep, req, req_dma_count, 0);
1172                         num_completed++;
1173                         break;
1174                 } else if (!ep->is_in &&
1175                            (req->req.length % ep->ep.maxpacket) &&
1176                            !(ep->dev->quirks & PLX_PCIE)) {
1177
1178                         u32 const ep_stat = readl(&ep->regs->ep_stat);
1179                         /* AVOID TROUBLE HERE by not issuing short reads from
1180                          * your gadget driver.  That helps avoids errata 0121,
1181                          * 0122, and 0124; not all cases trigger the warning.
1182                          */
1183                         if ((ep_stat & BIT(NAK_OUT_PACKETS)) == 0) {
1184                                 ep_warn(ep->dev, "%s lost packet sync!\n",
1185                                                 ep->ep.name);
1186                                 req->req.status = -EOVERFLOW;
1187                         } else {
1188                                 u32 const ep_avail = readl(&ep->regs->ep_avail);
1189                                 if (ep_avail) {
1190                                         /* fifo gets flushed later */
1191                                         ep->out_overflow = 1;
1192                                         ep_dbg(ep->dev,
1193                                                 "%s dma, discard %d len %d\n",
1194                                                 ep->ep.name, ep_avail,
1195                                                 req->req.length);
1196                                         req->req.status = -EOVERFLOW;
1197                                 }
1198                         }
1199                 }
1200                 dma_done(ep, req, req_dma_count, 0);
1201                 num_completed++;
1202         }
1203
1204         return num_completed;
1205 }
1206
1207 static void restart_dma(struct net2280_ep *ep)
1208 {
1209         struct net2280_request  *req;
1210
1211         if (ep->stopped)
1212                 return;
1213         req = list_entry(ep->queue.next, struct net2280_request, queue);
1214
1215         start_dma(ep, req);
1216 }
1217
1218 static void abort_dma(struct net2280_ep *ep)
1219 {
1220         /* abort the current transfer */
1221         if (likely(!list_empty(&ep->queue))) {
1222                 /* FIXME work around errata 0121, 0122, 0124 */
1223                 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1224                 spin_stop_dma(ep->dma);
1225         } else
1226                 stop_dma(ep->dma);
1227         scan_dma_completions(ep);
1228 }
1229
1230 /* dequeue ALL requests */
1231 static void nuke(struct net2280_ep *ep)
1232 {
1233         struct net2280_request  *req;
1234
1235         /* called with spinlock held */
1236         ep->stopped = 1;
1237         if (ep->dma)
1238                 abort_dma(ep);
1239         while (!list_empty(&ep->queue)) {
1240                 req = list_entry(ep->queue.next,
1241                                 struct net2280_request,
1242                                 queue);
1243                 done(ep, req, -ESHUTDOWN);
1244         }
1245 }
1246
1247 /* dequeue JUST ONE request */
1248 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1249 {
1250         struct net2280_ep       *ep;
1251         struct net2280_request  *req;
1252         unsigned long           flags;
1253         u32                     dmactl;
1254         int                     stopped;
1255
1256         ep = container_of(_ep, struct net2280_ep, ep);
1257         if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1258                 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1259                                                 __func__, _ep, _req);
1260                 return -EINVAL;
1261         }
1262
1263         spin_lock_irqsave(&ep->dev->lock, flags);
1264         stopped = ep->stopped;
1265
1266         /* quiesce dma while we patch the queue */
1267         dmactl = 0;
1268         ep->stopped = 1;
1269         if (ep->dma) {
1270                 dmactl = readl(&ep->dma->dmactl);
1271                 /* WARNING erratum 0127 may kick in ... */
1272                 stop_dma(ep->dma);
1273                 scan_dma_completions(ep);
1274         }
1275
1276         /* make sure it's still queued on this endpoint */
1277         list_for_each_entry(req, &ep->queue, queue) {
1278                 if (&req->req == _req)
1279                         break;
1280         }
1281         if (&req->req != _req) {
1282                 spin_unlock_irqrestore(&ep->dev->lock, flags);
1283                 dev_err(&ep->dev->pdev->dev, "%s: Request mismatch\n",
1284                                                                 __func__);
1285                 return -EINVAL;
1286         }
1287
1288         /* queue head may be partially complete. */
1289         if (ep->queue.next == &req->queue) {
1290                 if (ep->dma) {
1291                         ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1292                         _req->status = -ECONNRESET;
1293                         abort_dma(ep);
1294                         if (likely(ep->queue.next == &req->queue)) {
1295                                 /* NOTE: misreports single-transfer mode*/
1296                                 req->td->dmacount = 0;  /* invalidate */
1297                                 dma_done(ep, req,
1298                                         readl(&ep->dma->dmacount),
1299                                         -ECONNRESET);
1300                         }
1301                 } else {
1302                         ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1303                         done(ep, req, -ECONNRESET);
1304                 }
1305                 req = NULL;
1306         }
1307
1308         if (req)
1309                 done(ep, req, -ECONNRESET);
1310         ep->stopped = stopped;
1311
1312         if (ep->dma) {
1313                 /* turn off dma on inactive queues */
1314                 if (list_empty(&ep->queue))
1315                         stop_dma(ep->dma);
1316                 else if (!ep->stopped) {
1317                         /* resume current request, or start new one */
1318                         if (req)
1319                                 writel(dmactl, &ep->dma->dmactl);
1320                         else
1321                                 start_dma(ep, list_entry(ep->queue.next,
1322                                         struct net2280_request, queue));
1323                 }
1324         }
1325
1326         spin_unlock_irqrestore(&ep->dev->lock, flags);
1327         return 0;
1328 }
1329
1330 /*-------------------------------------------------------------------------*/
1331
1332 static int net2280_fifo_status(struct usb_ep *_ep);
1333
1334 static int
1335 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1336 {
1337         struct net2280_ep       *ep;
1338         unsigned long           flags;
1339         int                     retval = 0;
1340
1341         ep = container_of(_ep, struct net2280_ep, ep);
1342         if (!_ep || (!ep->desc && ep->num != 0)) {
1343                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1344                 return -EINVAL;
1345         }
1346         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1347                 retval = -ESHUTDOWN;
1348                 goto print_err;
1349         }
1350         if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1351                                                 == USB_ENDPOINT_XFER_ISOC) {
1352                 retval = -EINVAL;
1353                 goto print_err;
1354         }
1355
1356         spin_lock_irqsave(&ep->dev->lock, flags);
1357         if (!list_empty(&ep->queue)) {
1358                 retval = -EAGAIN;
1359                 goto print_unlock;
1360         } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1361                 retval = -EAGAIN;
1362                 goto print_unlock;
1363         } else {
1364                 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1365                                 value ? "set" : "clear",
1366                                 wedged ? "wedge" : "halt");
1367                 /* set/clear, then synch memory views with the device */
1368                 if (value) {
1369                         if (ep->num == 0)
1370                                 ep->dev->protocol_stall = 1;
1371                         else
1372                                 set_halt(ep);
1373                         if (wedged)
1374                                 ep->wedged = 1;
1375                 } else {
1376                         clear_halt(ep);
1377                         if (ep->dev->quirks & PLX_PCIE &&
1378                                 !list_empty(&ep->queue) && ep->td_dma)
1379                                         restart_dma(ep);
1380                         ep->wedged = 0;
1381                 }
1382                 (void) readl(&ep->regs->ep_rsp);
1383         }
1384         spin_unlock_irqrestore(&ep->dev->lock, flags);
1385
1386         return retval;
1387
1388 print_unlock:
1389         spin_unlock_irqrestore(&ep->dev->lock, flags);
1390 print_err:
1391         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1392         return retval;
1393 }
1394
1395 static int net2280_set_halt(struct usb_ep *_ep, int value)
1396 {
1397         return net2280_set_halt_and_wedge(_ep, value, 0);
1398 }
1399
1400 static int net2280_set_wedge(struct usb_ep *_ep)
1401 {
1402         if (!_ep || _ep->name == ep0name) {
1403                 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1404                 return -EINVAL;
1405         }
1406         return net2280_set_halt_and_wedge(_ep, 1, 1);
1407 }
1408
1409 static int net2280_fifo_status(struct usb_ep *_ep)
1410 {
1411         struct net2280_ep       *ep;
1412         u32                     avail;
1413
1414         ep = container_of(_ep, struct net2280_ep, ep);
1415         if (!_ep || (!ep->desc && ep->num != 0)) {
1416                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1417                 return -ENODEV;
1418         }
1419         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1420                 dev_err(&ep->dev->pdev->dev,
1421                         "%s: Invalid driver=%p or speed=%d\n",
1422                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1423                 return -ESHUTDOWN;
1424         }
1425
1426         avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1427         if (avail > ep->fifo_size) {
1428                 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1429                 return -EOVERFLOW;
1430         }
1431         if (ep->is_in)
1432                 avail = ep->fifo_size - avail;
1433         return avail;
1434 }
1435
1436 static void net2280_fifo_flush(struct usb_ep *_ep)
1437 {
1438         struct net2280_ep       *ep;
1439
1440         ep = container_of(_ep, struct net2280_ep, ep);
1441         if (!_ep || (!ep->desc && ep->num != 0)) {
1442                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1443                 return;
1444         }
1445         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1446                 dev_err(&ep->dev->pdev->dev,
1447                         "%s: Invalid driver=%p or speed=%d\n",
1448                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1449                 return;
1450         }
1451
1452         writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1453         (void) readl(&ep->regs->ep_rsp);
1454 }
1455
1456 static const struct usb_ep_ops net2280_ep_ops = {
1457         .enable         = net2280_enable,
1458         .disable        = net2280_disable,
1459
1460         .alloc_request  = net2280_alloc_request,
1461         .free_request   = net2280_free_request,
1462
1463         .queue          = net2280_queue,
1464         .dequeue        = net2280_dequeue,
1465
1466         .set_halt       = net2280_set_halt,
1467         .set_wedge      = net2280_set_wedge,
1468         .fifo_status    = net2280_fifo_status,
1469         .fifo_flush     = net2280_fifo_flush,
1470 };
1471
1472 /*-------------------------------------------------------------------------*/
1473
1474 static int net2280_get_frame(struct usb_gadget *_gadget)
1475 {
1476         struct net2280          *dev;
1477         unsigned long           flags;
1478         u16                     retval;
1479
1480         if (!_gadget)
1481                 return -ENODEV;
1482         dev = container_of(_gadget, struct net2280, gadget);
1483         spin_lock_irqsave(&dev->lock, flags);
1484         retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1485         spin_unlock_irqrestore(&dev->lock, flags);
1486         return retval;
1487 }
1488
1489 static int net2280_wakeup(struct usb_gadget *_gadget)
1490 {
1491         struct net2280          *dev;
1492         u32                     tmp;
1493         unsigned long           flags;
1494
1495         if (!_gadget)
1496                 return 0;
1497         dev = container_of(_gadget, struct net2280, gadget);
1498
1499         spin_lock_irqsave(&dev->lock, flags);
1500         tmp = readl(&dev->usb->usbctl);
1501         if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1502                 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1503         spin_unlock_irqrestore(&dev->lock, flags);
1504
1505         /* pci writes may still be posted */
1506         return 0;
1507 }
1508
1509 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1510 {
1511         struct net2280          *dev;
1512         u32                     tmp;
1513         unsigned long           flags;
1514
1515         if (!_gadget)
1516                 return 0;
1517         dev = container_of(_gadget, struct net2280, gadget);
1518
1519         spin_lock_irqsave(&dev->lock, flags);
1520         tmp = readl(&dev->usb->usbctl);
1521         if (value) {
1522                 tmp |= BIT(SELF_POWERED_STATUS);
1523                 _gadget->is_selfpowered = 1;
1524         } else {
1525                 tmp &= ~BIT(SELF_POWERED_STATUS);
1526                 _gadget->is_selfpowered = 0;
1527         }
1528         writel(tmp, &dev->usb->usbctl);
1529         spin_unlock_irqrestore(&dev->lock, flags);
1530
1531         return 0;
1532 }
1533
1534 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1535 {
1536         struct net2280  *dev;
1537         u32             tmp;
1538         unsigned long   flags;
1539
1540         if (!_gadget)
1541                 return -ENODEV;
1542         dev = container_of(_gadget, struct net2280, gadget);
1543
1544         spin_lock_irqsave(&dev->lock, flags);
1545         tmp = readl(&dev->usb->usbctl);
1546         dev->softconnect = (is_on != 0);
1547         if (is_on) {
1548                 ep0_start(dev);
1549                 writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1550         } else {
1551                 writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1552                 stop_activity(dev, dev->driver);
1553         }
1554
1555         spin_unlock_irqrestore(&dev->lock, flags);
1556
1557         return 0;
1558 }
1559
1560 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1561                 struct usb_endpoint_descriptor *desc,
1562                 struct usb_ss_ep_comp_descriptor *ep_comp)
1563 {
1564         char name[8];
1565         struct usb_ep *ep;
1566
1567         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1568                 /* ep-e, ep-f are PIO with only 64 byte fifos */
1569                 ep = gadget_find_ep_by_name(_gadget, "ep-e");
1570                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1571                         return ep;
1572                 ep = gadget_find_ep_by_name(_gadget, "ep-f");
1573                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1574                         return ep;
1575         }
1576
1577         /* USB3380: Only first four endpoints have DMA channels. Allocate
1578          * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc
1579          * endpoints use DMA hw endpoints.
1580          */
1581         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1582             usb_endpoint_dir_in(desc)) {
1583                 ep = gadget_find_ep_by_name(_gadget, "ep2in");
1584                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1585                         return ep;
1586                 ep = gadget_find_ep_by_name(_gadget, "ep4in");
1587                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1588                         return ep;
1589         } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1590                    !usb_endpoint_dir_in(desc)) {
1591                 ep = gadget_find_ep_by_name(_gadget, "ep1out");
1592                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1593                         return ep;
1594                 ep = gadget_find_ep_by_name(_gadget, "ep3out");
1595                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1596                         return ep;
1597         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1598                    usb_endpoint_dir_in(desc)) {
1599                 ep = gadget_find_ep_by_name(_gadget, "ep1in");
1600                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1601                         return ep;
1602                 ep = gadget_find_ep_by_name(_gadget, "ep3in");
1603                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1604                         return ep;
1605         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1606                    !usb_endpoint_dir_in(desc)) {
1607                 ep = gadget_find_ep_by_name(_gadget, "ep2out");
1608                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1609                         return ep;
1610                 ep = gadget_find_ep_by_name(_gadget, "ep4out");
1611                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1612                         return ep;
1613         }
1614
1615         /* USB3380: use same address for usb and hardware endpoints */
1616         snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1617                         usb_endpoint_dir_in(desc) ? "in" : "out");
1618         ep = gadget_find_ep_by_name(_gadget, name);
1619         if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1620                 return ep;
1621
1622         return NULL;
1623 }
1624
1625 static int net2280_start(struct usb_gadget *_gadget,
1626                 struct usb_gadget_driver *driver);
1627 static int net2280_stop(struct usb_gadget *_gadget);
1628
1629 static const struct usb_gadget_ops net2280_ops = {
1630         .get_frame      = net2280_get_frame,
1631         .wakeup         = net2280_wakeup,
1632         .set_selfpowered = net2280_set_selfpowered,
1633         .pullup         = net2280_pullup,
1634         .udc_start      = net2280_start,
1635         .udc_stop       = net2280_stop,
1636         .match_ep       = net2280_match_ep,
1637 };
1638
1639 /*-------------------------------------------------------------------------*/
1640
1641 #ifdef  CONFIG_USB_GADGET_DEBUG_FILES
1642
1643 /* FIXME move these into procfs, and use seq_file.
1644  * Sysfs _still_ doesn't behave for arbitrarily sized files,
1645  * and also doesn't help products using this with 2.4 kernels.
1646  */
1647
1648 /* "function" sysfs attribute */
1649 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1650                              char *buf)
1651 {
1652         struct net2280  *dev = dev_get_drvdata(_dev);
1653
1654         if (!dev->driver || !dev->driver->function ||
1655                         strlen(dev->driver->function) > PAGE_SIZE)
1656                 return 0;
1657         return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1658 }
1659 static DEVICE_ATTR_RO(function);
1660
1661 static ssize_t registers_show(struct device *_dev,
1662                               struct device_attribute *attr, char *buf)
1663 {
1664         struct net2280          *dev;
1665         char                    *next;
1666         unsigned                size, t;
1667         unsigned long           flags;
1668         int                     i;
1669         u32                     t1, t2;
1670         const char              *s;
1671
1672         dev = dev_get_drvdata(_dev);
1673         next = buf;
1674         size = PAGE_SIZE;
1675         spin_lock_irqsave(&dev->lock, flags);
1676
1677         if (dev->driver)
1678                 s = dev->driver->driver.name;
1679         else
1680                 s = "(none)";
1681
1682         /* Main Control Registers */
1683         t = scnprintf(next, size, "%s version " DRIVER_VERSION
1684                         ", chiprev %04x\n\n"
1685                         "devinit %03x fifoctl %08x gadget '%s'\n"
1686                         "pci irqenb0 %02x irqenb1 %08x "
1687                         "irqstat0 %04x irqstat1 %08x\n",
1688                         driver_name, dev->chiprev,
1689                         readl(&dev->regs->devinit),
1690                         readl(&dev->regs->fifoctl),
1691                         s,
1692                         readl(&dev->regs->pciirqenb0),
1693                         readl(&dev->regs->pciirqenb1),
1694                         readl(&dev->regs->irqstat0),
1695                         readl(&dev->regs->irqstat1));
1696         size -= t;
1697         next += t;
1698
1699         /* USB Control Registers */
1700         t1 = readl(&dev->usb->usbctl);
1701         t2 = readl(&dev->usb->usbstat);
1702         if (t1 & BIT(VBUS_PIN)) {
1703                 if (t2 & BIT(HIGH_SPEED))
1704                         s = "high speed";
1705                 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1706                         s = "powered";
1707                 else
1708                         s = "full speed";
1709                 /* full speed bit (6) not working?? */
1710         } else
1711                         s = "not attached";
1712         t = scnprintf(next, size,
1713                         "stdrsp %08x usbctl %08x usbstat %08x "
1714                                 "addr 0x%02x (%s)\n",
1715                         readl(&dev->usb->stdrsp), t1, t2,
1716                         readl(&dev->usb->ouraddr), s);
1717         size -= t;
1718         next += t;
1719
1720         /* PCI Master Control Registers */
1721
1722         /* DMA Control Registers */
1723
1724         /* Configurable EP Control Registers */
1725         for (i = 0; i < dev->n_ep; i++) {
1726                 struct net2280_ep       *ep;
1727
1728                 ep = &dev->ep[i];
1729                 if (i && !ep->desc)
1730                         continue;
1731
1732                 t1 = readl(&ep->cfg->ep_cfg);
1733                 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1734                 t = scnprintf(next, size,
1735                                 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1736                                         "irqenb %02x\n",
1737                                 ep->ep.name, t1, t2,
1738                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1739                                         ? "NAK " : "",
1740                                 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1741                                         ? "hide " : "",
1742                                 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1743                                         ? "CRC " : "",
1744                                 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1745                                         ? "interrupt " : "",
1746                                 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1747                                         ? "status " : "",
1748                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1749                                         ? "NAKmode " : "",
1750                                 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1751                                         ? "DATA1 " : "DATA0 ",
1752                                 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1753                                         ? "HALT " : "",
1754                                 readl(&ep->regs->ep_irqenb));
1755                 size -= t;
1756                 next += t;
1757
1758                 t = scnprintf(next, size,
1759                                 "\tstat %08x avail %04x "
1760                                 "(ep%d%s-%s)%s\n",
1761                                 readl(&ep->regs->ep_stat),
1762                                 readl(&ep->regs->ep_avail),
1763                                 t1 & 0x0f, DIR_STRING(t1),
1764                                 type_string(t1 >> 8),
1765                                 ep->stopped ? "*" : "");
1766                 size -= t;
1767                 next += t;
1768
1769                 if (!ep->dma)
1770                         continue;
1771
1772                 t = scnprintf(next, size,
1773                                 "  dma\tctl %08x stat %08x count %08x\n"
1774                                 "\taddr %08x desc %08x\n",
1775                                 readl(&ep->dma->dmactl),
1776                                 readl(&ep->dma->dmastat),
1777                                 readl(&ep->dma->dmacount),
1778                                 readl(&ep->dma->dmaaddr),
1779                                 readl(&ep->dma->dmadesc));
1780                 size -= t;
1781                 next += t;
1782
1783         }
1784
1785         /* Indexed Registers (none yet) */
1786
1787         /* Statistics */
1788         t = scnprintf(next, size, "\nirqs:  ");
1789         size -= t;
1790         next += t;
1791         for (i = 0; i < dev->n_ep; i++) {
1792                 struct net2280_ep       *ep;
1793
1794                 ep = &dev->ep[i];
1795                 if (i && !ep->irqs)
1796                         continue;
1797                 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1798                 size -= t;
1799                 next += t;
1800
1801         }
1802         t = scnprintf(next, size, "\n");
1803         size -= t;
1804         next += t;
1805
1806         spin_unlock_irqrestore(&dev->lock, flags);
1807
1808         return PAGE_SIZE - size;
1809 }
1810 static DEVICE_ATTR_RO(registers);
1811
1812 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1813                            char *buf)
1814 {
1815         struct net2280          *dev;
1816         char                    *next;
1817         unsigned                size;
1818         unsigned long           flags;
1819         int                     i;
1820
1821         dev = dev_get_drvdata(_dev);
1822         next = buf;
1823         size = PAGE_SIZE;
1824         spin_lock_irqsave(&dev->lock, flags);
1825
1826         for (i = 0; i < dev->n_ep; i++) {
1827                 struct net2280_ep               *ep = &dev->ep[i];
1828                 struct net2280_request          *req;
1829                 int                             t;
1830
1831                 if (i != 0) {
1832                         const struct usb_endpoint_descriptor    *d;
1833
1834                         d = ep->desc;
1835                         if (!d)
1836                                 continue;
1837                         t = d->bEndpointAddress;
1838                         t = scnprintf(next, size,
1839                                 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1840                                 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1841                                 (t & USB_DIR_IN) ? "in" : "out",
1842                                 type_string(d->bmAttributes),
1843                                 usb_endpoint_maxp(d),
1844                                 ep->dma ? "dma" : "pio", ep->fifo_size
1845                                 );
1846                 } else /* ep0 should only have one transfer queued */
1847                         t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1848                                         ep->is_in ? "in" : "out");
1849                 if (t <= 0 || t > size)
1850                         goto done;
1851                 size -= t;
1852                 next += t;
1853
1854                 if (list_empty(&ep->queue)) {
1855                         t = scnprintf(next, size, "\t(nothing queued)\n");
1856                         if (t <= 0 || t > size)
1857                                 goto done;
1858                         size -= t;
1859                         next += t;
1860                         continue;
1861                 }
1862                 list_for_each_entry(req, &ep->queue, queue) {
1863                         if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1864                                 t = scnprintf(next, size,
1865                                         "\treq %p len %d/%d "
1866                                         "buf %p (dmacount %08x)\n",
1867                                         &req->req, req->req.actual,
1868                                         req->req.length, req->req.buf,
1869                                         readl(&ep->dma->dmacount));
1870                         else
1871                                 t = scnprintf(next, size,
1872                                         "\treq %p len %d/%d buf %p\n",
1873                                         &req->req, req->req.actual,
1874                                         req->req.length, req->req.buf);
1875                         if (t <= 0 || t > size)
1876                                 goto done;
1877                         size -= t;
1878                         next += t;
1879
1880                         if (ep->dma) {
1881                                 struct net2280_dma      *td;
1882
1883                                 td = req->td;
1884                                 t = scnprintf(next, size, "\t    td %08x "
1885                                         " count %08x buf %08x desc %08x\n",
1886                                         (u32) req->td_dma,
1887                                         le32_to_cpu(td->dmacount),
1888                                         le32_to_cpu(td->dmaaddr),
1889                                         le32_to_cpu(td->dmadesc));
1890                                 if (t <= 0 || t > size)
1891                                         goto done;
1892                                 size -= t;
1893                                 next += t;
1894                         }
1895                 }
1896         }
1897
1898 done:
1899         spin_unlock_irqrestore(&dev->lock, flags);
1900         return PAGE_SIZE - size;
1901 }
1902 static DEVICE_ATTR_RO(queues);
1903
1904
1905 #else
1906
1907 #define device_create_file(a, b)        (0)
1908 #define device_remove_file(a, b)        do { } while (0)
1909
1910 #endif
1911
1912 /*-------------------------------------------------------------------------*/
1913
1914 /* another driver-specific mode might be a request type doing dma
1915  * to/from another device fifo instead of to/from memory.
1916  */
1917
1918 static void set_fifo_mode(struct net2280 *dev, int mode)
1919 {
1920         /* keeping high bits preserves BAR2 */
1921         writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1922
1923         /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1924         INIT_LIST_HEAD(&dev->gadget.ep_list);
1925         list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1926         list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1927         switch (mode) {
1928         case 0:
1929                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1930                 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1931                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1932                 break;
1933         case 1:
1934                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1935                 break;
1936         case 2:
1937                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1938                 dev->ep[1].fifo_size = 2048;
1939                 dev->ep[2].fifo_size = 1024;
1940                 break;
1941         }
1942         /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1943         list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1944         list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1945 }
1946
1947 static void defect7374_disable_data_eps(struct net2280 *dev)
1948 {
1949         /*
1950          * For Defect 7374, disable data EPs (and more):
1951          *  - This phase undoes the earlier phase of the Defect 7374 workaround,
1952          *    returing ep regs back to normal.
1953          */
1954         struct net2280_ep *ep;
1955         int i;
1956         unsigned char ep_sel;
1957         u32 tmp_reg;
1958
1959         for (i = 1; i < 5; i++) {
1960                 ep = &dev->ep[i];
1961                 writel(i, &ep->cfg->ep_cfg);
1962         }
1963
1964         /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1965         for (i = 0; i < 6; i++)
1966                 writel(0, &dev->dep[i].dep_cfg);
1967
1968         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1969                 /* Select an endpoint for subsequent operations: */
1970                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1971                 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1972
1973                 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1974                                         ep_sel == 18 || ep_sel == 20)
1975                         continue;
1976
1977                 /* Change settings on some selected endpoints */
1978                 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1979                 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1980                 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1981                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1982                 tmp_reg |= BIT(EP_INITIALIZED);
1983                 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1984         }
1985 }
1986
1987 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1988 {
1989         u32 tmp = 0, tmp_reg;
1990         u32 scratch;
1991         int i;
1992         unsigned char ep_sel;
1993
1994         scratch = get_idx_reg(dev->regs, SCRATCH);
1995
1996         WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1997                 == DEFECT7374_FSM_SS_CONTROL_READ);
1998
1999         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2000
2001         ep_warn(dev, "Operate Defect 7374 workaround soft this time");
2002         ep_warn(dev, "It will operate on cold-reboot and SS connect");
2003
2004         /*GPEPs:*/
2005         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
2006                         (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
2007                         ((dev->enhanced_mode) ?
2008                          BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
2009                          BIT(ENDPOINT_ENABLE)));
2010
2011         for (i = 1; i < 5; i++)
2012                 writel(tmp, &dev->ep[i].cfg->ep_cfg);
2013
2014         /* CSRIN, PCIIN, STATIN, RCIN*/
2015         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
2016         writel(tmp, &dev->dep[1].dep_cfg);
2017         writel(tmp, &dev->dep[3].dep_cfg);
2018         writel(tmp, &dev->dep[4].dep_cfg);
2019         writel(tmp, &dev->dep[5].dep_cfg);
2020
2021         /*Implemented for development and debug.
2022          * Can be refined/tuned later.*/
2023         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
2024                 /* Select an endpoint for subsequent operations: */
2025                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
2026                 writel(((tmp_reg & ~0x1f) | ep_sel),
2027                                 &dev->plregs->pl_ep_ctrl);
2028
2029                 if (ep_sel == 1) {
2030                         tmp =
2031                                 (readl(&dev->plregs->pl_ep_ctrl) |
2032                                  BIT(CLEAR_ACK_ERROR_CODE) | 0);
2033                         writel(tmp, &dev->plregs->pl_ep_ctrl);
2034                         continue;
2035                 }
2036
2037                 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
2038                                 ep_sel == 18  || ep_sel == 20)
2039                         continue;
2040
2041                 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
2042                                 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
2043                 writel(tmp, &dev->plregs->pl_ep_cfg_4);
2044
2045                 tmp = readl(&dev->plregs->pl_ep_ctrl) &
2046                         ~BIT(EP_INITIALIZED);
2047                 writel(tmp, &dev->plregs->pl_ep_ctrl);
2048
2049         }
2050
2051         /* Set FSM to focus on the first Control Read:
2052          * - Tip: Connection speed is known upon the first
2053          * setup request.*/
2054         scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2055         set_idx_reg(dev->regs, SCRATCH, scratch);
2056
2057 }
2058
2059 /* keeping it simple:
2060  * - one bus driver, initted first;
2061  * - one function driver, initted second
2062  *
2063  * most of the work to support multiple net2280 controllers would
2064  * be to associate this gadget driver (yes?) with all of them, or
2065  * perhaps to bind specific drivers to specific devices.
2066  */
2067
2068 static void usb_reset_228x(struct net2280 *dev)
2069 {
2070         u32     tmp;
2071
2072         dev->gadget.speed = USB_SPEED_UNKNOWN;
2073         (void) readl(&dev->usb->usbctl);
2074
2075         net2280_led_init(dev);
2076
2077         /* disable automatic responses, and irqs */
2078         writel(0, &dev->usb->stdrsp);
2079         writel(0, &dev->regs->pciirqenb0);
2080         writel(0, &dev->regs->pciirqenb1);
2081
2082         /* clear old dma and irq state */
2083         for (tmp = 0; tmp < 4; tmp++) {
2084                 struct net2280_ep       *ep = &dev->ep[tmp + 1];
2085                 if (ep->dma)
2086                         abort_dma(ep);
2087         }
2088
2089         writel(~0, &dev->regs->irqstat0),
2090         writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2091
2092         /* reset, and enable pci */
2093         tmp = readl(&dev->regs->devinit) |
2094                 BIT(PCI_ENABLE) |
2095                 BIT(FIFO_SOFT_RESET) |
2096                 BIT(USB_SOFT_RESET) |
2097                 BIT(M8051_RESET);
2098         writel(tmp, &dev->regs->devinit);
2099
2100         /* standard fifo and endpoint allocations */
2101         set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2102 }
2103
2104 static void usb_reset_338x(struct net2280 *dev)
2105 {
2106         u32 tmp;
2107
2108         dev->gadget.speed = USB_SPEED_UNKNOWN;
2109         (void)readl(&dev->usb->usbctl);
2110
2111         net2280_led_init(dev);
2112
2113         if (dev->bug7734_patched) {
2114                 /* disable automatic responses, and irqs */
2115                 writel(0, &dev->usb->stdrsp);
2116                 writel(0, &dev->regs->pciirqenb0);
2117                 writel(0, &dev->regs->pciirqenb1);
2118         }
2119
2120         /* clear old dma and irq state */
2121         for (tmp = 0; tmp < 4; tmp++) {
2122                 struct net2280_ep *ep = &dev->ep[tmp + 1];
2123                 struct net2280_dma_regs __iomem *dma;
2124
2125                 if (ep->dma) {
2126                         abort_dma(ep);
2127                 } else {
2128                         dma = &dev->dma[tmp];
2129                         writel(BIT(DMA_ABORT), &dma->dmastat);
2130                         writel(0, &dma->dmactl);
2131                 }
2132         }
2133
2134         writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2135
2136         if (dev->bug7734_patched) {
2137                 /* reset, and enable pci */
2138                 tmp = readl(&dev->regs->devinit) |
2139                     BIT(PCI_ENABLE) |
2140                     BIT(FIFO_SOFT_RESET) |
2141                     BIT(USB_SOFT_RESET) |
2142                     BIT(M8051_RESET);
2143
2144                 writel(tmp, &dev->regs->devinit);
2145         }
2146
2147         /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2148         INIT_LIST_HEAD(&dev->gadget.ep_list);
2149
2150         for (tmp = 1; tmp < dev->n_ep; tmp++)
2151                 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2152
2153 }
2154
2155 static void usb_reset(struct net2280 *dev)
2156 {
2157         if (dev->quirks & PLX_LEGACY)
2158                 return usb_reset_228x(dev);
2159         return usb_reset_338x(dev);
2160 }
2161
2162 static void usb_reinit_228x(struct net2280 *dev)
2163 {
2164         u32     tmp;
2165
2166         /* basic endpoint init */
2167         for (tmp = 0; tmp < 7; tmp++) {
2168                 struct net2280_ep       *ep = &dev->ep[tmp];
2169
2170                 ep->ep.name = ep_info_dft[tmp].name;
2171                 ep->ep.caps = ep_info_dft[tmp].caps;
2172                 ep->dev = dev;
2173                 ep->num = tmp;
2174
2175                 if (tmp > 0 && tmp <= 4) {
2176                         ep->fifo_size = 1024;
2177                         ep->dma = &dev->dma[tmp - 1];
2178                 } else
2179                         ep->fifo_size = 64;
2180                 ep->regs = &dev->epregs[tmp];
2181                 ep->cfg = &dev->epregs[tmp];
2182                 ep_reset_228x(dev->regs, ep);
2183         }
2184         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2185         usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2186         usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2187
2188         dev->gadget.ep0 = &dev->ep[0].ep;
2189         dev->ep[0].stopped = 0;
2190         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2191
2192         /* we want to prevent lowlevel/insecure access from the USB host,
2193          * but erratum 0119 means this enable bit is ignored
2194          */
2195         for (tmp = 0; tmp < 5; tmp++)
2196                 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2197 }
2198
2199 static void usb_reinit_338x(struct net2280 *dev)
2200 {
2201         int i;
2202         u32 tmp, val;
2203         static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2204         static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2205                                                 0x00, 0xC0, 0x00, 0xC0 };
2206
2207         /* basic endpoint init */
2208         for (i = 0; i < dev->n_ep; i++) {
2209                 struct net2280_ep *ep = &dev->ep[i];
2210
2211                 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2212                                                    ep_info_dft[i].name;
2213                 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2214                                                    ep_info_dft[i].caps;
2215                 ep->dev = dev;
2216                 ep->num = i;
2217
2218                 if (i > 0 && i <= 4)
2219                         ep->dma = &dev->dma[i - 1];
2220
2221                 if (dev->enhanced_mode) {
2222                         ep->cfg = &dev->epregs[ne[i]];
2223                         /*
2224                          * Set USB endpoint number, hardware allows same number
2225                          * in both directions.
2226                          */
2227                          if (i > 0 && i < 5)
2228                                 writel(ne[i], &ep->cfg->ep_cfg);
2229                         ep->regs = (struct net2280_ep_regs __iomem *)
2230                                 (((void __iomem *)&dev->epregs[ne[i]]) +
2231                                 ep_reg_addr[i]);
2232                 } else {
2233                         ep->cfg = &dev->epregs[i];
2234                         ep->regs = &dev->epregs[i];
2235                 }
2236
2237                 ep->fifo_size = (i != 0) ? 2048 : 512;
2238
2239                 ep_reset_338x(dev->regs, ep);
2240         }
2241         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2242
2243         dev->gadget.ep0 = &dev->ep[0].ep;
2244         dev->ep[0].stopped = 0;
2245
2246         /* Link layer set up */
2247         if (dev->bug7734_patched) {
2248                 tmp = readl(&dev->usb_ext->usbctl2) &
2249                     ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2250                 writel(tmp, &dev->usb_ext->usbctl2);
2251         }
2252
2253         /* Hardware Defect and Workaround */
2254         val = readl(&dev->ll_lfps_regs->ll_lfps_5);
2255         val &= ~(0xf << TIMER_LFPS_6US);
2256         val |= 0x5 << TIMER_LFPS_6US;
2257         writel(val, &dev->ll_lfps_regs->ll_lfps_5);
2258
2259         val = readl(&dev->ll_lfps_regs->ll_lfps_6);
2260         val &= ~(0xffff << TIMER_LFPS_80US);
2261         val |= 0x0100 << TIMER_LFPS_80US;
2262         writel(val, &dev->ll_lfps_regs->ll_lfps_6);
2263
2264         /*
2265          * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2266          * Hot Reset Exit Handshake may Fail in Specific Case using
2267          * Default Register Settings. Workaround for Enumeration test.
2268          */
2269         val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
2270         val &= ~(0x1f << HOT_TX_NORESET_TS2);
2271         val |= 0x10 << HOT_TX_NORESET_TS2;
2272         writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
2273
2274         val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
2275         val &= ~(0x1f << HOT_RX_RESET_TS2);
2276         val |= 0x3 << HOT_RX_RESET_TS2;
2277         writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
2278
2279         /*
2280          * Set Recovery Idle to Recover bit:
2281          * - On SS connections, setting Recovery Idle to Recover Fmw improves
2282          *   link robustness with various hosts and hubs.
2283          * - It is safe to set for all connection speeds; all chip revisions.
2284          * - R-M-W to leave other bits undisturbed.
2285          * - Reference PLX TT-7372
2286         */
2287         val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
2288         val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2289         writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
2290
2291         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2292
2293         /* disable dedicated endpoints */
2294         writel(0x0D, &dev->dep[0].dep_cfg);
2295         writel(0x0D, &dev->dep[1].dep_cfg);
2296         writel(0x0E, &dev->dep[2].dep_cfg);
2297         writel(0x0E, &dev->dep[3].dep_cfg);
2298         writel(0x0F, &dev->dep[4].dep_cfg);
2299         writel(0x0C, &dev->dep[5].dep_cfg);
2300 }
2301
2302 static void usb_reinit(struct net2280 *dev)
2303 {
2304         if (dev->quirks & PLX_LEGACY)
2305                 return usb_reinit_228x(dev);
2306         return usb_reinit_338x(dev);
2307 }
2308
2309 static void ep0_start_228x(struct net2280 *dev)
2310 {
2311         writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2312                 BIT(CLEAR_NAK_OUT_PACKETS) |
2313                 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2314                 &dev->epregs[0].ep_rsp);
2315
2316         /*
2317          * hardware optionally handles a bunch of standard requests
2318          * that the API hides from drivers anyway.  have it do so.
2319          * endpoint status/features are handled in software, to
2320          * help pass tests for some dubious behavior.
2321          */
2322         writel(BIT(SET_TEST_MODE) |
2323                 BIT(SET_ADDRESS) |
2324                 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2325                 BIT(GET_DEVICE_STATUS) |
2326                 BIT(GET_INTERFACE_STATUS),
2327                 &dev->usb->stdrsp);
2328         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2329                 BIT(SELF_POWERED_USB_DEVICE) |
2330                 BIT(REMOTE_WAKEUP_SUPPORT) |
2331                 (dev->softconnect << USB_DETECT_ENABLE) |
2332                 BIT(SELF_POWERED_STATUS),
2333                 &dev->usb->usbctl);
2334
2335         /* enable irqs so we can see ep0 and general operation  */
2336         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2337                 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2338                 &dev->regs->pciirqenb0);
2339         writel(BIT(PCI_INTERRUPT_ENABLE) |
2340                 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2341                 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2342                 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2343                 BIT(VBUS_INTERRUPT_ENABLE) |
2344                 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2345                 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2346                 &dev->regs->pciirqenb1);
2347
2348         /* don't leave any writes posted */
2349         (void) readl(&dev->usb->usbctl);
2350 }
2351
2352 static void ep0_start_338x(struct net2280 *dev)
2353 {
2354
2355         if (dev->bug7734_patched)
2356                 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2357                        BIT(SET_EP_HIDE_STATUS_PHASE),
2358                        &dev->epregs[0].ep_rsp);
2359
2360         /*
2361          * hardware optionally handles a bunch of standard requests
2362          * that the API hides from drivers anyway.  have it do so.
2363          * endpoint status/features are handled in software, to
2364          * help pass tests for some dubious behavior.
2365          */
2366         writel(BIT(SET_ISOCHRONOUS_DELAY) |
2367                BIT(SET_SEL) |
2368                BIT(SET_TEST_MODE) |
2369                BIT(SET_ADDRESS) |
2370                BIT(GET_INTERFACE_STATUS) |
2371                BIT(GET_DEVICE_STATUS),
2372                 &dev->usb->stdrsp);
2373         dev->wakeup_enable = 1;
2374         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2375                (dev->softconnect << USB_DETECT_ENABLE) |
2376                BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2377                &dev->usb->usbctl);
2378
2379         /* enable irqs so we can see ep0 and general operation  */
2380         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2381                BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2382                &dev->regs->pciirqenb0);
2383         writel(BIT(PCI_INTERRUPT_ENABLE) |
2384                BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2385                BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2386                BIT(VBUS_INTERRUPT_ENABLE),
2387                &dev->regs->pciirqenb1);
2388
2389         /* don't leave any writes posted */
2390         (void)readl(&dev->usb->usbctl);
2391 }
2392
2393 static void ep0_start(struct net2280 *dev)
2394 {
2395         if (dev->quirks & PLX_LEGACY)
2396                 return ep0_start_228x(dev);
2397         return ep0_start_338x(dev);
2398 }
2399
2400 /* when a driver is successfully registered, it will receive
2401  * control requests including set_configuration(), which enables
2402  * non-control requests.  then usb traffic follows until a
2403  * disconnect is reported.  then a host may connect again, or
2404  * the driver might get unbound.
2405  */
2406 static int net2280_start(struct usb_gadget *_gadget,
2407                 struct usb_gadget_driver *driver)
2408 {
2409         struct net2280          *dev;
2410         int                     retval;
2411         unsigned                i;
2412
2413         /* insist on high speed support from the driver, since
2414          * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2415          * "must not be used in normal operation"
2416          */
2417         if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2418                         !driver->setup)
2419                 return -EINVAL;
2420
2421         dev = container_of(_gadget, struct net2280, gadget);
2422
2423         for (i = 0; i < dev->n_ep; i++)
2424                 dev->ep[i].irqs = 0;
2425
2426         /* hook up the driver ... */
2427         driver->driver.bus = NULL;
2428         dev->driver = driver;
2429
2430         retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2431         if (retval)
2432                 goto err_unbind;
2433         retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2434         if (retval)
2435                 goto err_func;
2436
2437         /* enable host detection and ep0; and we're ready
2438          * for set_configuration as well as eventual disconnect.
2439          */
2440         net2280_led_active(dev, 1);
2441
2442         if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
2443                 defect7374_enable_data_eps_zero(dev);
2444
2445         ep0_start(dev);
2446
2447         /* pci writes may still be posted */
2448         return 0;
2449
2450 err_func:
2451         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2452 err_unbind:
2453         dev->driver = NULL;
2454         return retval;
2455 }
2456
2457 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2458 {
2459         int                     i;
2460
2461         /* don't disconnect if it's not connected */
2462         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2463                 driver = NULL;
2464
2465         /* stop hardware; prevent new request submissions;
2466          * and kill any outstanding requests.
2467          */
2468         usb_reset(dev);
2469         for (i = 0; i < dev->n_ep; i++)
2470                 nuke(&dev->ep[i]);
2471
2472         /* report disconnect; the driver is already quiesced */
2473         if (driver) {
2474                 spin_unlock(&dev->lock);
2475                 driver->disconnect(&dev->gadget);
2476                 spin_lock(&dev->lock);
2477         }
2478
2479         usb_reinit(dev);
2480 }
2481
2482 static int net2280_stop(struct usb_gadget *_gadget)
2483 {
2484         struct net2280  *dev;
2485         unsigned long   flags;
2486
2487         dev = container_of(_gadget, struct net2280, gadget);
2488
2489         spin_lock_irqsave(&dev->lock, flags);
2490         stop_activity(dev, NULL);
2491         spin_unlock_irqrestore(&dev->lock, flags);
2492
2493         net2280_led_active(dev, 0);
2494
2495         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2496         device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2497
2498         dev->driver = NULL;
2499
2500         return 0;
2501 }
2502
2503 /*-------------------------------------------------------------------------*/
2504
2505 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2506  * also works for dma-capable endpoints, in pio mode or just
2507  * to manually advance the queue after short OUT transfers.
2508  */
2509 static void handle_ep_small(struct net2280_ep *ep)
2510 {
2511         struct net2280_request  *req;
2512         u32                     t;
2513         /* 0 error, 1 mid-data, 2 done */
2514         int                     mode = 1;
2515
2516         if (!list_empty(&ep->queue))
2517                 req = list_entry(ep->queue.next,
2518                         struct net2280_request, queue);
2519         else
2520                 req = NULL;
2521
2522         /* ack all, and handle what we care about */
2523         t = readl(&ep->regs->ep_stat);
2524         ep->irqs++;
2525
2526         ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2527                         ep->ep.name, t, req ? &req->req : NULL);
2528
2529         if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2530                 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2531         else
2532                 /* Added for 2282 */
2533                 writel(t, &ep->regs->ep_stat);
2534
2535         /* for ep0, monitor token irqs to catch data stage length errors
2536          * and to synchronize on status.
2537          *
2538          * also, to defer reporting of protocol stalls ... here's where
2539          * data or status first appears, handling stalls here should never
2540          * cause trouble on the host side..
2541          *
2542          * control requests could be slightly faster without token synch for
2543          * status, but status can jam up that way.
2544          */
2545         if (unlikely(ep->num == 0)) {
2546                 if (ep->is_in) {
2547                         /* status; stop NAKing */
2548                         if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2549                                 if (ep->dev->protocol_stall) {
2550                                         ep->stopped = 1;
2551                                         set_halt(ep);
2552                                 }
2553                                 if (!req)
2554                                         allow_status(ep);
2555                                 mode = 2;
2556                         /* reply to extra IN data tokens with a zlp */
2557                         } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2558                                 if (ep->dev->protocol_stall) {
2559                                         ep->stopped = 1;
2560                                         set_halt(ep);
2561                                         mode = 2;
2562                                 } else if (ep->responded &&
2563                                                 !req && !ep->stopped)
2564                                         write_fifo(ep, NULL);
2565                         }
2566                 } else {
2567                         /* status; stop NAKing */
2568                         if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2569                                 if (ep->dev->protocol_stall) {
2570                                         ep->stopped = 1;
2571                                         set_halt(ep);
2572                                 }
2573                                 mode = 2;
2574                         /* an extra OUT token is an error */
2575                         } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2576                                         req &&
2577                                         req->req.actual == req->req.length) ||
2578                                         (ep->responded && !req)) {
2579                                 ep->dev->protocol_stall = 1;
2580                                 set_halt(ep);
2581                                 ep->stopped = 1;
2582                                 if (req)
2583                                         done(ep, req, -EOVERFLOW);
2584                                 req = NULL;
2585                         }
2586                 }
2587         }
2588
2589         if (unlikely(!req))
2590                 return;
2591
2592         /* manual DMA queue advance after short OUT */
2593         if (likely(ep->dma)) {
2594                 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2595                         struct net2280_request *stuck_req = NULL;
2596                         int     stopped = ep->stopped;
2597                         int     num_completed;
2598                         int     stuck = 0;
2599                         u32     count;
2600
2601                         /* TRANSFERRED works around OUT_DONE erratum 0112.
2602                          * we expect (N <= maxpacket) bytes; host wrote M.
2603                          * iff (M < N) we won't ever see a DMA interrupt.
2604                          */
2605                         ep->stopped = 1;
2606                         for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2607
2608                                 /* any preceding dma transfers must finish.
2609                                  * dma handles (M >= N), may empty the queue
2610                                  */
2611                                 num_completed = scan_dma_completions(ep);
2612                                 if (unlikely(list_empty(&ep->queue) ||
2613                                                 ep->out_overflow)) {
2614                                         req = NULL;
2615                                         break;
2616                                 }
2617                                 req = list_entry(ep->queue.next,
2618                                         struct net2280_request, queue);
2619
2620                                 /* here either (M < N), a "real" short rx;
2621                                  * or (M == N) and the queue didn't empty
2622                                  */
2623                                 if (likely(t & BIT(FIFO_EMPTY))) {
2624                                         count = readl(&ep->dma->dmacount);
2625                                         count &= DMA_BYTE_COUNT_MASK;
2626                                         if (readl(&ep->dma->dmadesc)
2627                                                         != req->td_dma)
2628                                                 req = NULL;
2629                                         break;
2630                                 }
2631
2632                                 /* Escape loop if no dma transfers completed
2633                                  * after few retries.
2634                                  */
2635                                 if (num_completed == 0) {
2636                                         if (stuck_req == req &&
2637                                             readl(&ep->dma->dmadesc) !=
2638                                                   req->td_dma && stuck++ > 5) {
2639                                                 count = readl(
2640                                                         &ep->dma->dmacount);
2641                                                 count &= DMA_BYTE_COUNT_MASK;
2642                                                 req = NULL;
2643                                                 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n",
2644                                                         ep->ep.name, stuck,
2645                                                         count);
2646                                                 break;
2647                                         } else if (stuck_req != req) {
2648                                                 stuck_req = req;
2649                                                 stuck = 0;
2650                                         }
2651                                 } else {
2652                                         stuck_req = NULL;
2653                                         stuck = 0;
2654                                 }
2655
2656                                 udelay(1);
2657                         }
2658
2659                         /* stop DMA, leave ep NAKing */
2660                         writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2661                         spin_stop_dma(ep->dma);
2662
2663                         if (likely(req)) {
2664                                 req->td->dmacount = 0;
2665                                 t = readl(&ep->regs->ep_avail);
2666                                 dma_done(ep, req, count,
2667                                         (ep->out_overflow || t)
2668                                                 ? -EOVERFLOW : 0);
2669                         }
2670
2671                         /* also flush to prevent erratum 0106 trouble */
2672                         if (unlikely(ep->out_overflow ||
2673                                         (ep->dev->chiprev == 0x0100 &&
2674                                         ep->dev->gadget.speed
2675                                         == USB_SPEED_FULL))) {
2676                                 out_flush(ep);
2677                                 ep->out_overflow = 0;
2678                         }
2679
2680                         /* (re)start dma if needed, stop NAKing */
2681                         ep->stopped = stopped;
2682                         if (!list_empty(&ep->queue))
2683                                 restart_dma(ep);
2684                 } else
2685                         ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2686                                         ep->ep.name, t);
2687                 return;
2688
2689         /* data packet(s) received (in the fifo, OUT) */
2690         } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2691                 if (read_fifo(ep, req) && ep->num != 0)
2692                         mode = 2;
2693
2694         /* data packet(s) transmitted (IN) */
2695         } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2696                 unsigned        len;
2697
2698                 len = req->req.length - req->req.actual;
2699                 if (len > ep->ep.maxpacket)
2700                         len = ep->ep.maxpacket;
2701                 req->req.actual += len;
2702
2703                 /* if we wrote it all, we're usually done */
2704                 /* send zlps until the status stage */
2705                 if ((req->req.actual == req->req.length) &&
2706                         (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2707                                 mode = 2;
2708
2709         /* there was nothing to do ...  */
2710         } else if (mode == 1)
2711                 return;
2712
2713         /* done */
2714         if (mode == 2) {
2715                 /* stream endpoints often resubmit/unlink in completion */
2716                 done(ep, req, 0);
2717
2718                 /* maybe advance queue to next request */
2719                 if (ep->num == 0) {
2720                         /* NOTE:  net2280 could let gadget driver start the
2721                          * status stage later. since not all controllers let
2722                          * them control that, the api doesn't (yet) allow it.
2723                          */
2724                         if (!ep->stopped)
2725                                 allow_status(ep);
2726                         req = NULL;
2727                 } else {
2728                         if (!list_empty(&ep->queue) && !ep->stopped)
2729                                 req = list_entry(ep->queue.next,
2730                                         struct net2280_request, queue);
2731                         else
2732                                 req = NULL;
2733                         if (req && !ep->is_in)
2734                                 stop_out_naking(ep);
2735                 }
2736         }
2737
2738         /* is there a buffer for the next packet?
2739          * for best streaming performance, make sure there is one.
2740          */
2741         if (req && !ep->stopped) {
2742
2743                 /* load IN fifo with next packet (may be zlp) */
2744                 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2745                         write_fifo(ep, &req->req);
2746         }
2747 }
2748
2749 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2750 {
2751         struct net2280_ep       *ep;
2752
2753         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2754                 return &dev->ep[0];
2755         list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2756                 u8      bEndpointAddress;
2757
2758                 if (!ep->desc)
2759                         continue;
2760                 bEndpointAddress = ep->desc->bEndpointAddress;
2761                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2762                         continue;
2763                 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2764                         return ep;
2765         }
2766         return NULL;
2767 }
2768
2769 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2770 {
2771         u32 scratch, fsmvalue;
2772         u32 ack_wait_timeout, state;
2773
2774         /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2775         scratch = get_idx_reg(dev->regs, SCRATCH);
2776         fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2777         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2778
2779         if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2780                                 (r.bRequestType & USB_DIR_IN)))
2781                 return;
2782
2783         /* This is the first Control Read for this connection: */
2784         if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2785                 /*
2786                  * Connection is NOT SS:
2787                  * - Connection must be FS or HS.
2788                  * - This FSM state should allow workaround software to
2789                  * run after the next USB connection.
2790                  */
2791                 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2792                 dev->bug7734_patched = 1;
2793                 goto restore_data_eps;
2794         }
2795
2796         /* Connection is SS: */
2797         for (ack_wait_timeout = 0;
2798                         ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2799                         ack_wait_timeout++) {
2800
2801                 state = readl(&dev->plregs->pl_ep_status_1)
2802                         & (0xff << STATE);
2803                 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2804                         (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2805                         scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2806                         dev->bug7734_patched = 1;
2807                         break;
2808                 }
2809
2810                 /*
2811                  * We have not yet received host's Data Phase ACK
2812                  * - Wait and try again.
2813                  */
2814                 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2815
2816                 continue;
2817         }
2818
2819
2820         if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2821                 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2822                 "to detect SS host's data phase ACK.");
2823                 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2824                 "got 0x%2.2x.\n", state >> STATE);
2825         } else {
2826                 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2827                 "%duSec for Control Read Data Phase ACK\n",
2828                         DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2829         }
2830
2831 restore_data_eps:
2832         /*
2833          * Restore data EPs to their pre-workaround settings (disabled,
2834          * initialized, and other details).
2835          */
2836         defect7374_disable_data_eps(dev);
2837
2838         set_idx_reg(dev->regs, SCRATCH, scratch);
2839
2840         return;
2841 }
2842
2843 static void ep_clear_seqnum(struct net2280_ep *ep)
2844 {
2845         struct net2280 *dev = ep->dev;
2846         u32 val;
2847         static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2848
2849         val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2850         val |= ep_pl[ep->num];
2851         writel(val, &dev->plregs->pl_ep_ctrl);
2852         val |= BIT(SEQUENCE_NUMBER_RESET);
2853         writel(val, &dev->plregs->pl_ep_ctrl);
2854
2855         return;
2856 }
2857
2858 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2859                 struct net2280_ep *ep, struct usb_ctrlrequest r)
2860 {
2861         int tmp = 0;
2862
2863 #define w_value         le16_to_cpu(r.wValue)
2864 #define w_index         le16_to_cpu(r.wIndex)
2865 #define w_length        le16_to_cpu(r.wLength)
2866
2867         switch (r.bRequest) {
2868                 struct net2280_ep *e;
2869                 u16 status;
2870
2871         case USB_REQ_SET_CONFIGURATION:
2872                 dev->addressed_state = !w_value;
2873                 goto usb3_delegate;
2874
2875         case USB_REQ_GET_STATUS:
2876                 switch (r.bRequestType) {
2877                 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2878                         status = dev->wakeup_enable ? 0x02 : 0x00;
2879                         if (dev->gadget.is_selfpowered)
2880                                 status |= BIT(0);
2881                         status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2882                                                         dev->ltm_enable << 4);
2883                         writel(0, &dev->epregs[0].ep_irqenb);
2884                         set_fifo_bytecount(ep, sizeof(status));
2885                         writel((__force u32) status, &dev->epregs[0].ep_data);
2886                         allow_status_338x(ep);
2887                         break;
2888
2889                 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2890                         e = get_ep_by_addr(dev, w_index);
2891                         if (!e)
2892                                 goto do_stall3;
2893                         status = readl(&e->regs->ep_rsp) &
2894                                                 BIT(CLEAR_ENDPOINT_HALT);
2895                         writel(0, &dev->epregs[0].ep_irqenb);
2896                         set_fifo_bytecount(ep, sizeof(status));
2897                         writel((__force u32) status, &dev->epregs[0].ep_data);
2898                         allow_status_338x(ep);
2899                         break;
2900
2901                 default:
2902                         goto usb3_delegate;
2903                 }
2904                 break;
2905
2906         case USB_REQ_CLEAR_FEATURE:
2907                 switch (r.bRequestType) {
2908                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2909                         if (!dev->addressed_state) {
2910                                 switch (w_value) {
2911                                 case USB_DEVICE_U1_ENABLE:
2912                                         dev->u1_enable = 0;
2913                                         writel(readl(&dev->usb_ext->usbctl2) &
2914                                                 ~BIT(U1_ENABLE),
2915                                                 &dev->usb_ext->usbctl2);
2916                                         allow_status_338x(ep);
2917                                         goto next_endpoints3;
2918
2919                                 case USB_DEVICE_U2_ENABLE:
2920                                         dev->u2_enable = 0;
2921                                         writel(readl(&dev->usb_ext->usbctl2) &
2922                                                 ~BIT(U2_ENABLE),
2923                                                 &dev->usb_ext->usbctl2);
2924                                         allow_status_338x(ep);
2925                                         goto next_endpoints3;
2926
2927                                 case USB_DEVICE_LTM_ENABLE:
2928                                         dev->ltm_enable = 0;
2929                                         writel(readl(&dev->usb_ext->usbctl2) &
2930                                                 ~BIT(LTM_ENABLE),
2931                                                 &dev->usb_ext->usbctl2);
2932                                         allow_status_338x(ep);
2933                                         goto next_endpoints3;
2934
2935                                 default:
2936                                         break;
2937                                 }
2938                         }
2939                         if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2940                                 dev->wakeup_enable = 0;
2941                                 writel(readl(&dev->usb->usbctl) &
2942                                         ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2943                                         &dev->usb->usbctl);
2944                                 allow_status_338x(ep);
2945                                 break;
2946                         }
2947                         goto usb3_delegate;
2948
2949                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2950                         e = get_ep_by_addr(dev, w_index);
2951                         if (!e)
2952                                 goto do_stall3;
2953                         if (w_value != USB_ENDPOINT_HALT)
2954                                 goto do_stall3;
2955                         ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2956                         /*
2957                          * Workaround for SS SeqNum not cleared via
2958                          * Endpoint Halt (Clear) bit. select endpoint
2959                          */
2960                         ep_clear_seqnum(e);
2961                         clear_halt(e);
2962                         if (!list_empty(&e->queue) && e->td_dma)
2963                                 restart_dma(e);
2964                         allow_status(ep);
2965                         ep->stopped = 1;
2966                         break;
2967
2968                 default:
2969                         goto usb3_delegate;
2970                 }
2971                 break;
2972         case USB_REQ_SET_FEATURE:
2973                 switch (r.bRequestType) {
2974                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2975                         if (!dev->addressed_state) {
2976                                 switch (w_value) {
2977                                 case USB_DEVICE_U1_ENABLE:
2978                                         dev->u1_enable = 1;
2979                                         writel(readl(&dev->usb_ext->usbctl2) |
2980                                                 BIT(U1_ENABLE),
2981                                                 &dev->usb_ext->usbctl2);
2982                                         allow_status_338x(ep);
2983                                         goto next_endpoints3;
2984
2985                                 case USB_DEVICE_U2_ENABLE:
2986                                         dev->u2_enable = 1;
2987                                         writel(readl(&dev->usb_ext->usbctl2) |
2988                                                 BIT(U2_ENABLE),
2989                                                 &dev->usb_ext->usbctl2);
2990                                         allow_status_338x(ep);
2991                                         goto next_endpoints3;
2992
2993                                 case USB_DEVICE_LTM_ENABLE:
2994                                         dev->ltm_enable = 1;
2995                                         writel(readl(&dev->usb_ext->usbctl2) |
2996                                                 BIT(LTM_ENABLE),
2997                                                 &dev->usb_ext->usbctl2);
2998                                         allow_status_338x(ep);
2999                                         goto next_endpoints3;
3000                                 default:
3001                                         break;
3002                                 }
3003                         }
3004
3005                         if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
3006                                 dev->wakeup_enable = 1;
3007                                 writel(readl(&dev->usb->usbctl) |
3008                                         BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
3009                                         &dev->usb->usbctl);
3010                                 allow_status_338x(ep);
3011                                 break;
3012                         }
3013                         goto usb3_delegate;
3014
3015                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
3016                         e = get_ep_by_addr(dev, w_index);
3017                         if (!e || (w_value != USB_ENDPOINT_HALT))
3018                                 goto do_stall3;
3019                         ep->stopped = 1;
3020                         if (ep->num == 0)
3021                                 ep->dev->protocol_stall = 1;
3022                         else {
3023                                 if (ep->dma)
3024                                         abort_dma(ep);
3025                                 set_halt(ep);
3026                         }
3027                         allow_status_338x(ep);
3028                         break;
3029
3030                 default:
3031                         goto usb3_delegate;
3032                 }
3033
3034                 break;
3035         default:
3036
3037 usb3_delegate:
3038                 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
3039                                 r.bRequestType, r.bRequest,
3040                                 w_value, w_index, w_length,
3041                                 readl(&ep->cfg->ep_cfg));
3042
3043                 ep->responded = 0;
3044                 spin_unlock(&dev->lock);
3045                 tmp = dev->driver->setup(&dev->gadget, &r);
3046                 spin_lock(&dev->lock);
3047         }
3048 do_stall3:
3049         if (tmp < 0) {
3050                 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3051                                 r.bRequestType, r.bRequest, tmp);
3052                 dev->protocol_stall = 1;
3053                 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
3054                 set_halt(ep);
3055         }
3056
3057 next_endpoints3:
3058
3059 #undef  w_value
3060 #undef  w_index
3061 #undef  w_length
3062
3063         return;
3064 }
3065
3066 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
3067 {
3068         u32 index;
3069         u32 bit;
3070
3071         for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
3072                 bit = BIT(ep_bit[index]);
3073
3074                 if (!stat0)
3075                         break;
3076
3077                 if (!(stat0 & bit))
3078                         continue;
3079
3080                 stat0 &= ~bit;
3081
3082                 handle_ep_small(&dev->ep[index]);
3083         }
3084 }
3085
3086 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
3087 {
3088         struct net2280_ep       *ep;
3089         u32                     num, scratch;
3090
3091         /* most of these don't need individual acks */
3092         stat &= ~BIT(INTA_ASSERTED);
3093         if (!stat)
3094                 return;
3095         /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
3096
3097         /* starting a control request? */
3098         if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
3099                 union {
3100                         u32                     raw[2];
3101                         struct usb_ctrlrequest  r;
3102                 } u;
3103                 int                             tmp;
3104                 struct net2280_request          *req;
3105
3106                 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
3107                         u32 val = readl(&dev->usb->usbstat);
3108                         if (val & BIT(SUPER_SPEED)) {
3109                                 dev->gadget.speed = USB_SPEED_SUPER;
3110                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3111                                                 EP0_SS_MAX_PACKET_SIZE);
3112                         } else if (val & BIT(HIGH_SPEED)) {
3113                                 dev->gadget.speed = USB_SPEED_HIGH;
3114                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3115                                                 EP0_HS_MAX_PACKET_SIZE);
3116                         } else {
3117                                 dev->gadget.speed = USB_SPEED_FULL;
3118                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3119                                                 EP0_HS_MAX_PACKET_SIZE);
3120                         }
3121                         net2280_led_speed(dev, dev->gadget.speed);
3122                         ep_dbg(dev, "%s\n",
3123                                         usb_speed_string(dev->gadget.speed));
3124                 }
3125
3126                 ep = &dev->ep[0];
3127                 ep->irqs++;
3128
3129                 /* make sure any leftover request state is cleared */
3130                 stat &= ~BIT(ENDPOINT_0_INTERRUPT);
3131                 while (!list_empty(&ep->queue)) {
3132                         req = list_entry(ep->queue.next,
3133                                         struct net2280_request, queue);
3134                         done(ep, req, (req->req.actual == req->req.length)
3135                                                 ? 0 : -EPROTO);
3136                 }
3137                 ep->stopped = 0;
3138                 dev->protocol_stall = 0;
3139                 if (!(dev->quirks & PLX_PCIE)) {
3140                         if (ep->dev->quirks & PLX_2280)
3141                                 tmp = BIT(FIFO_OVERFLOW) |
3142                                     BIT(FIFO_UNDERFLOW);
3143                         else
3144                                 tmp = 0;
3145
3146                         writel(tmp | BIT(TIMEOUT) |
3147                                    BIT(USB_STALL_SENT) |
3148                                    BIT(USB_IN_NAK_SENT) |
3149                                    BIT(USB_IN_ACK_RCVD) |
3150                                    BIT(USB_OUT_PING_NAK_SENT) |
3151                                    BIT(USB_OUT_ACK_SENT) |
3152                                    BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3153                                    BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3154                                    BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3155                                    BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3156                                    BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3157                                    BIT(DATA_IN_TOKEN_INTERRUPT),
3158                                    &ep->regs->ep_stat);
3159                 }
3160                 u.raw[0] = readl(&dev->usb->setup0123);
3161                 u.raw[1] = readl(&dev->usb->setup4567);
3162
3163                 cpu_to_le32s(&u.raw[0]);
3164                 cpu_to_le32s(&u.raw[1]);
3165
3166                 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
3167                         defect7374_workaround(dev, u.r);
3168
3169                 tmp = 0;
3170
3171 #define w_value         le16_to_cpu(u.r.wValue)
3172 #define w_index         le16_to_cpu(u.r.wIndex)
3173 #define w_length        le16_to_cpu(u.r.wLength)
3174
3175                 /* ack the irq */
3176                 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3177                 stat ^= BIT(SETUP_PACKET_INTERRUPT);
3178
3179                 /* watch control traffic at the token level, and force
3180                  * synchronization before letting the status stage happen.
3181                  * FIXME ignore tokens we'll NAK, until driver responds.
3182                  * that'll mean a lot less irqs for some drivers.
3183                  */
3184                 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3185                 if (ep->is_in) {
3186                         scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3187                                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3188                                 BIT(DATA_IN_TOKEN_INTERRUPT);
3189                         stop_out_naking(ep);
3190                 } else
3191                         scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3192                                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3193                                 BIT(DATA_IN_TOKEN_INTERRUPT);
3194                 writel(scratch, &dev->epregs[0].ep_irqenb);
3195
3196                 /* we made the hardware handle most lowlevel requests;
3197                  * everything else goes uplevel to the gadget code.
3198                  */
3199                 ep->responded = 1;
3200
3201                 if (dev->gadget.speed == USB_SPEED_SUPER) {
3202                         handle_stat0_irqs_superspeed(dev, ep, u.r);
3203                         goto next_endpoints;
3204                 }
3205
3206                 switch (u.r.bRequest) {
3207                 case USB_REQ_GET_STATUS: {
3208                         struct net2280_ep       *e;
3209                         __le32                  status;
3210
3211                         /* hw handles device and interface status */
3212                         if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3213                                 goto delegate;
3214                         e = get_ep_by_addr(dev, w_index);
3215                         if (!e || w_length > 2)
3216                                 goto do_stall;
3217
3218                         if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3219                                 status = cpu_to_le32(1);
3220                         else
3221                                 status = cpu_to_le32(0);
3222
3223                         /* don't bother with a request object! */
3224                         writel(0, &dev->epregs[0].ep_irqenb);
3225                         set_fifo_bytecount(ep, w_length);
3226                         writel((__force u32)status, &dev->epregs[0].ep_data);
3227                         allow_status(ep);
3228                         ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3229                         goto next_endpoints;
3230                         }
3231                         break;
3232                 case USB_REQ_CLEAR_FEATURE: {
3233                         struct net2280_ep       *e;
3234
3235                         /* hw handles device features */
3236                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3237                                 goto delegate;
3238                         if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3239                                 goto do_stall;
3240                         e = get_ep_by_addr(dev, w_index);
3241                         if (!e)
3242                                 goto do_stall;
3243                         if (e->wedged) {
3244                                 ep_vdbg(dev, "%s wedged, halt not cleared\n",
3245                                                 ep->ep.name);
3246                         } else {
3247                                 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3248                                 clear_halt(e);
3249                                 if ((ep->dev->quirks & PLX_PCIE) &&
3250                                         !list_empty(&e->queue) && e->td_dma)
3251                                                 restart_dma(e);
3252                         }
3253                         allow_status(ep);
3254                         goto next_endpoints;
3255                         }
3256                         break;
3257                 case USB_REQ_SET_FEATURE: {
3258                         struct net2280_ep       *e;
3259
3260                         /* hw handles device features */
3261                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3262                                 goto delegate;
3263                         if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3264                                 goto do_stall;
3265                         e = get_ep_by_addr(dev, w_index);
3266                         if (!e)
3267                                 goto do_stall;
3268                         if (e->ep.name == ep0name)
3269                                 goto do_stall;
3270                         set_halt(e);
3271                         if ((dev->quirks & PLX_PCIE) && e->dma)
3272                                 abort_dma(e);
3273                         allow_status(ep);
3274                         ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3275                         goto next_endpoints;
3276                         }
3277                         break;
3278                 default:
3279 delegate:
3280                         ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3281                                 "ep_cfg %08x\n",
3282                                 u.r.bRequestType, u.r.bRequest,
3283                                 w_value, w_index, w_length,
3284                                 readl(&ep->cfg->ep_cfg));
3285                         ep->responded = 0;
3286                         spin_unlock(&dev->lock);
3287                         tmp = dev->driver->setup(&dev->gadget, &u.r);
3288                         spin_lock(&dev->lock);
3289                 }
3290
3291                 /* stall ep0 on error */
3292                 if (tmp < 0) {
3293 do_stall:
3294                         ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3295                                         u.r.bRequestType, u.r.bRequest, tmp);
3296                         dev->protocol_stall = 1;
3297                 }
3298
3299                 /* some in/out token irq should follow; maybe stall then.
3300                  * driver must queue a request (even zlp) or halt ep0
3301                  * before the host times out.
3302                  */
3303         }
3304
3305 #undef  w_value
3306 #undef  w_index
3307 #undef  w_length
3308
3309 next_endpoints:
3310         if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
3311                 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3312                         USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3313                         USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3314
3315                 if (stat & mask) {
3316                         usb338x_handle_ep_intr(dev, stat & mask);
3317                         stat &= ~mask;
3318                 }
3319         } else {
3320                 /* endpoint data irq ? */
3321                 scratch = stat & 0x7f;
3322                 stat &= ~0x7f;
3323                 for (num = 0; scratch; num++) {
3324                         u32             t;
3325
3326                         /* do this endpoint's FIFO and queue need tending? */
3327                         t = BIT(num);
3328                         if ((scratch & t) == 0)
3329                                 continue;
3330                         scratch ^= t;
3331
3332                         ep = &dev->ep[num];
3333                         handle_ep_small(ep);
3334                 }
3335         }
3336
3337         if (stat)
3338                 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3339 }
3340
3341 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3342                 BIT(DMA_C_INTERRUPT) | \
3343                 BIT(DMA_B_INTERRUPT) | \
3344                 BIT(DMA_A_INTERRUPT))
3345 #define PCI_ERROR_INTERRUPTS ( \
3346                 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3347                 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3348                 BIT(PCI_RETRY_ABORT_INTERRUPT))
3349
3350 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3351 __releases(dev->lock)
3352 __acquires(dev->lock)
3353 {
3354         struct net2280_ep       *ep;
3355         u32                     tmp, num, mask, scratch;
3356
3357         /* after disconnect there's nothing else to do! */
3358         tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3359         mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3360
3361         /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3362          * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3363          * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3364          * only indicates a change in the reset state).
3365          */
3366         if (stat & tmp) {
3367                 bool    reset = false;
3368                 bool    disconnect = false;
3369
3370                 /*
3371                  * Ignore disconnects and resets if the speed hasn't been set.
3372                  * VBUS can bounce and there's always an initial reset.
3373                  */
3374                 writel(tmp, &dev->regs->irqstat1);
3375                 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3376                         if ((stat & BIT(VBUS_INTERRUPT)) &&
3377                                         (readl(&dev->usb->usbctl) &
3378                                                 BIT(VBUS_PIN)) == 0) {
3379                                 disconnect = true;
3380                                 ep_dbg(dev, "disconnect %s\n",
3381                                                 dev->driver->driver.name);
3382                         } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3383                                         (readl(&dev->usb->usbstat) & mask)
3384                                                 == 0) {
3385                                 reset = true;
3386                                 ep_dbg(dev, "reset %s\n",
3387                                                 dev->driver->driver.name);
3388                         }
3389
3390                         if (disconnect || reset) {
3391                                 stop_activity(dev, dev->driver);
3392                                 ep0_start(dev);
3393                                 spin_unlock(&dev->lock);
3394                                 if (reset)
3395                                         usb_gadget_udc_reset
3396                                                 (&dev->gadget, dev->driver);
3397                                 else
3398                                         (dev->driver->disconnect)
3399                                                 (&dev->gadget);
3400                                 spin_lock(&dev->lock);
3401                                 return;
3402                         }
3403                 }
3404                 stat &= ~tmp;
3405
3406                 /* vBUS can bounce ... one of many reasons to ignore the
3407                  * notion of hotplug events on bus connect/disconnect!
3408                  */
3409                 if (!stat)
3410                         return;
3411         }
3412
3413         /* NOTE: chip stays in PCI D0 state for now, but it could
3414          * enter D1 to save more power
3415          */
3416         tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3417         if (stat & tmp) {
3418                 writel(tmp, &dev->regs->irqstat1);
3419                 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3420                         if (dev->driver->suspend)
3421                                 dev->driver->suspend(&dev->gadget);
3422                         if (!enable_suspend)
3423                                 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3424                 } else {
3425                         if (dev->driver->resume)
3426                                 dev->driver->resume(&dev->gadget);
3427                         /* at high speed, note erratum 0133 */
3428                 }
3429                 stat &= ~tmp;
3430         }
3431
3432         /* clear any other status/irqs */
3433         if (stat)
3434                 writel(stat, &dev->regs->irqstat1);
3435
3436         /* some status we can just ignore */
3437         if (dev->quirks & PLX_2280)
3438                 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3439                           BIT(SUSPEND_REQUEST_INTERRUPT) |
3440                           BIT(RESUME_INTERRUPT) |
3441                           BIT(SOF_INTERRUPT));
3442         else
3443                 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3444                           BIT(RESUME_INTERRUPT) |
3445                           BIT(SOF_DOWN_INTERRUPT) |
3446                           BIT(SOF_INTERRUPT));
3447
3448         if (!stat)
3449                 return;
3450         /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3451
3452         /* DMA status, for ep-{a,b,c,d} */
3453         scratch = stat & DMA_INTERRUPTS;
3454         stat &= ~DMA_INTERRUPTS;
3455         scratch >>= 9;
3456         for (num = 0; scratch; num++) {
3457                 struct net2280_dma_regs __iomem *dma;
3458
3459                 tmp = BIT(num);
3460                 if ((tmp & scratch) == 0)
3461                         continue;
3462                 scratch ^= tmp;
3463
3464                 ep = &dev->ep[num + 1];
3465                 dma = ep->dma;
3466
3467                 if (!dma)
3468                         continue;
3469
3470                 /* clear ep's dma status */
3471                 tmp = readl(&dma->dmastat);
3472                 writel(tmp, &dma->dmastat);
3473
3474                 /* dma sync*/
3475                 if (dev->quirks & PLX_PCIE) {
3476                         u32 r_dmacount = readl(&dma->dmacount);
3477                         if (!ep->is_in &&  (r_dmacount & 0x00FFFFFF) &&
3478                             (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3479                                 continue;
3480                 }
3481
3482                 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3483                         ep_dbg(ep->dev, "%s no xact done? %08x\n",
3484                                 ep->ep.name, tmp);
3485                         continue;
3486                 }
3487                 stop_dma(ep->dma);
3488
3489                 /* OUT transfers terminate when the data from the
3490                  * host is in our memory.  Process whatever's done.
3491                  * On this path, we know transfer's last packet wasn't
3492                  * less than req->length. NAK_OUT_PACKETS may be set,
3493                  * or the FIFO may already be holding new packets.
3494                  *
3495                  * IN transfers can linger in the FIFO for a very
3496                  * long time ... we ignore that for now, accounting
3497                  * precisely (like PIO does) needs per-packet irqs
3498                  */
3499                 scan_dma_completions(ep);
3500
3501                 /* disable dma on inactive queues; else maybe restart */
3502                 if (!list_empty(&ep->queue)) {
3503                         tmp = readl(&dma->dmactl);
3504                         restart_dma(ep);
3505                 }
3506                 ep->irqs++;
3507         }
3508
3509         /* NOTE:  there are other PCI errors we might usefully notice.
3510          * if they appear very often, here's where to try recovering.
3511          */
3512         if (stat & PCI_ERROR_INTERRUPTS) {
3513                 ep_err(dev, "pci dma error; stat %08x\n", stat);
3514                 stat &= ~PCI_ERROR_INTERRUPTS;
3515                 /* these are fatal errors, but "maybe" they won't
3516                  * happen again ...
3517                  */
3518                 stop_activity(dev, dev->driver);
3519                 ep0_start(dev);
3520                 stat = 0;
3521         }
3522
3523         if (stat)
3524                 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3525 }
3526
3527 static irqreturn_t net2280_irq(int irq, void *_dev)
3528 {
3529         struct net2280          *dev = _dev;
3530
3531         /* shared interrupt, not ours */
3532         if ((dev->quirks & PLX_LEGACY) &&
3533                 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3534                 return IRQ_NONE;
3535
3536         spin_lock(&dev->lock);
3537
3538         /* handle disconnect, dma, and more */
3539         handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3540
3541         /* control requests and PIO */
3542         handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3543
3544         if (dev->quirks & PLX_PCIE) {
3545                 /* re-enable interrupt to trigger any possible new interrupt */
3546                 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3547                 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3548                 writel(pciirqenb1, &dev->regs->pciirqenb1);
3549         }
3550
3551         spin_unlock(&dev->lock);
3552
3553         return IRQ_HANDLED;
3554 }
3555
3556 /*-------------------------------------------------------------------------*/
3557
3558 static void gadget_release(struct device *_dev)
3559 {
3560         struct net2280  *dev = dev_get_drvdata(_dev);
3561
3562         kfree(dev);
3563 }
3564
3565 /* tear down the binding between this driver and the pci device */
3566
3567 static void net2280_remove(struct pci_dev *pdev)
3568 {
3569         struct net2280          *dev = pci_get_drvdata(pdev);
3570
3571         usb_del_gadget_udc(&dev->gadget);
3572
3573         BUG_ON(dev->driver);
3574
3575         /* then clean up the resources we allocated during probe() */
3576         net2280_led_shutdown(dev);
3577         if (dev->requests) {
3578                 int             i;
3579                 for (i = 1; i < 5; i++) {
3580                         if (!dev->ep[i].dummy)
3581                                 continue;
3582                         pci_pool_free(dev->requests, dev->ep[i].dummy,
3583                                         dev->ep[i].td_dma);
3584                 }
3585                 pci_pool_destroy(dev->requests);
3586         }
3587         if (dev->got_irq)
3588                 free_irq(pdev->irq, dev);
3589         if (dev->quirks & PLX_PCIE)
3590                 pci_disable_msi(pdev);
3591         if (dev->regs)
3592                 iounmap(dev->regs);
3593         if (dev->region)
3594                 release_mem_region(pci_resource_start(pdev, 0),
3595                                 pci_resource_len(pdev, 0));
3596         if (dev->enabled)
3597                 pci_disable_device(pdev);
3598         device_remove_file(&pdev->dev, &dev_attr_registers);
3599
3600         ep_info(dev, "unbind\n");
3601 }
3602
3603 /* wrap this driver around the specified device, but
3604  * don't respond over USB until a gadget driver binds to us.
3605  */
3606
3607 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3608 {
3609         struct net2280          *dev;
3610         unsigned long           resource, len;
3611         void                    __iomem *base = NULL;
3612         int                     retval, i;
3613
3614         /* alloc, and start init */
3615         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3616         if (dev == NULL) {
3617                 retval = -ENOMEM;
3618                 goto done;
3619         }
3620
3621         pci_set_drvdata(pdev, dev);
3622         spin_lock_init(&dev->lock);
3623         dev->quirks = id->driver_data;
3624         dev->pdev = pdev;
3625         dev->gadget.ops = &net2280_ops;
3626         dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3627                                 USB_SPEED_SUPER : USB_SPEED_HIGH;
3628
3629         /* the "gadget" abstracts/virtualizes the controller */
3630         dev->gadget.name = driver_name;
3631
3632         /* now all the pci goodies ... */
3633         if (pci_enable_device(pdev) < 0) {
3634                 retval = -ENODEV;
3635                 goto done;
3636         }
3637         dev->enabled = 1;
3638
3639         /* BAR 0 holds all the registers
3640          * BAR 1 is 8051 memory; unused here (note erratum 0103)
3641          * BAR 2 is fifo memory; unused here
3642          */
3643         resource = pci_resource_start(pdev, 0);
3644         len = pci_resource_len(pdev, 0);
3645         if (!request_mem_region(resource, len, driver_name)) {
3646                 ep_dbg(dev, "controller already in use\n");
3647                 retval = -EBUSY;
3648                 goto done;
3649         }
3650         dev->region = 1;
3651
3652         /* FIXME provide firmware download interface to put
3653          * 8051 code into the chip, e.g. to turn on PCI PM.
3654          */
3655
3656         base = ioremap_nocache(resource, len);
3657         if (base == NULL) {
3658                 ep_dbg(dev, "can't map memory\n");
3659                 retval = -EFAULT;
3660                 goto done;
3661         }
3662         dev->regs = (struct net2280_regs __iomem *) base;
3663         dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3664         dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3665         dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3666         dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3667         dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3668
3669         if (dev->quirks & PLX_PCIE) {
3670                 u32 fsmvalue;
3671                 u32 usbstat;
3672                 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3673                                                         (base + 0x00b4);
3674                 dev->llregs = (struct usb338x_ll_regs __iomem *)
3675                                                         (base + 0x0700);
3676                 dev->ll_lfps_regs = (struct usb338x_ll_lfps_regs __iomem *)
3677                                                         (base + 0x0748);
3678                 dev->ll_tsn_regs = (struct usb338x_ll_tsn_regs __iomem *)
3679                                                         (base + 0x077c);
3680                 dev->ll_chicken_reg = (struct usb338x_ll_chi_regs __iomem *)
3681                                                         (base + 0x079c);
3682                 dev->plregs = (struct usb338x_pl_regs __iomem *)
3683                                                         (base + 0x0800);
3684                 usbstat = readl(&dev->usb->usbstat);
3685                 dev->enhanced_mode = !!(usbstat & BIT(11));
3686                 dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3687                 /* put into initial config, link up all endpoints */
3688                 fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3689                                         (0xf << DEFECT7374_FSM_FIELD);
3690                 /* See if firmware needs to set up for workaround: */
3691                 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3692                         dev->bug7734_patched = 1;
3693                         writel(0, &dev->usb->usbctl);
3694                 } else
3695                         dev->bug7734_patched = 0;
3696         } else {
3697                 dev->enhanced_mode = 0;
3698                 dev->n_ep = 7;
3699                 /* put into initial config, link up all endpoints */
3700                 writel(0, &dev->usb->usbctl);
3701         }
3702
3703         usb_reset(dev);
3704         usb_reinit(dev);
3705
3706         /* irq setup after old hardware is cleaned up */
3707         if (!pdev->irq) {
3708                 ep_err(dev, "No IRQ.  Check PCI setup!\n");
3709                 retval = -ENODEV;
3710                 goto done;
3711         }
3712
3713         if (dev->quirks & PLX_PCIE)
3714                 if (pci_enable_msi(pdev))
3715                         ep_err(dev, "Failed to enable MSI mode\n");
3716
3717         if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3718                                                         driver_name, dev)) {
3719                 ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3720                 retval = -EBUSY;
3721                 goto done;
3722         }
3723         dev->got_irq = 1;
3724
3725         /* DMA setup */
3726         /* NOTE:  we know only the 32 LSBs of dma addresses may be nonzero */
3727         dev->requests = pci_pool_create("requests", pdev,
3728                 sizeof(struct net2280_dma),
3729                 0 /* no alignment requirements */,
3730                 0 /* or page-crossing issues */);
3731         if (!dev->requests) {
3732                 ep_dbg(dev, "can't get request pool\n");
3733                 retval = -ENOMEM;
3734                 goto done;
3735         }
3736         for (i = 1; i < 5; i++) {
3737                 struct net2280_dma      *td;
3738
3739                 td = pci_pool_alloc(dev->requests, GFP_KERNEL,
3740                                 &dev->ep[i].td_dma);
3741                 if (!td) {
3742                         ep_dbg(dev, "can't get dummy %d\n", i);
3743                         retval = -ENOMEM;
3744                         goto done;
3745                 }
3746                 td->dmacount = 0;       /* not VALID */
3747                 td->dmadesc = td->dmaaddr;
3748                 dev->ep[i].dummy = td;
3749         }
3750
3751         /* enable lower-overhead pci memory bursts during DMA */
3752         if (dev->quirks & PLX_LEGACY)
3753                 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3754                         /*
3755                          * 256 write retries may not be enough...
3756                            BIT(PCI_RETRY_ABORT_ENABLE) |
3757                         */
3758                         BIT(DMA_READ_MULTIPLE_ENABLE) |
3759                         BIT(DMA_READ_LINE_ENABLE),
3760                         &dev->pci->pcimstctl);
3761         /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3762         pci_set_master(pdev);
3763         pci_try_set_mwi(pdev);
3764
3765         /* ... also flushes any posted pci writes */
3766         dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3767
3768         /* done */
3769         ep_info(dev, "%s\n", driver_desc);
3770         ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3771                         pdev->irq, base, dev->chiprev);
3772         ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3773                 dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3774         retval = device_create_file(&pdev->dev, &dev_attr_registers);
3775         if (retval)
3776                 goto done;
3777
3778         retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
3779                         gadget_release);
3780         if (retval)
3781                 goto done;
3782         return 0;
3783
3784 done:
3785         if (dev)
3786                 net2280_remove(pdev);
3787         return retval;
3788 }
3789
3790 /* make sure the board is quiescent; otherwise it will continue
3791  * generating IRQs across the upcoming reboot.
3792  */
3793
3794 static void net2280_shutdown(struct pci_dev *pdev)
3795 {
3796         struct net2280          *dev = pci_get_drvdata(pdev);
3797
3798         /* disable IRQs */
3799         writel(0, &dev->regs->pciirqenb0);
3800         writel(0, &dev->regs->pciirqenb1);
3801
3802         /* disable the pullup so the host will think we're gone */
3803         writel(0, &dev->usb->usbctl);
3804
3805 }
3806
3807
3808 /*-------------------------------------------------------------------------*/
3809
3810 static const struct pci_device_id pci_ids[] = { {
3811         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3812         .class_mask =   ~0,
3813         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3814         .device =       0x2280,
3815         .subvendor =    PCI_ANY_ID,
3816         .subdevice =    PCI_ANY_ID,
3817         .driver_data =  PLX_LEGACY | PLX_2280,
3818         }, {
3819         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3820         .class_mask =   ~0,
3821         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3822         .device =       0x2282,
3823         .subvendor =    PCI_ANY_ID,
3824         .subdevice =    PCI_ANY_ID,
3825         .driver_data =  PLX_LEGACY,
3826         },
3827         {
3828         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3829         .class_mask =   ~0,
3830         .vendor =       PCI_VENDOR_ID_PLX,
3831         .device =       0x2380,
3832         .subvendor =    PCI_ANY_ID,
3833         .subdevice =    PCI_ANY_ID,
3834         .driver_data =  PLX_PCIE,
3835          },
3836         {
3837         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3838         .class_mask =   ~0,
3839         .vendor =       PCI_VENDOR_ID_PLX,
3840         .device =       0x3380,
3841         .subvendor =    PCI_ANY_ID,
3842         .subdevice =    PCI_ANY_ID,
3843         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3844          },
3845         {
3846         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3847         .class_mask =   ~0,
3848         .vendor =       PCI_VENDOR_ID_PLX,
3849         .device =       0x3382,
3850         .subvendor =    PCI_ANY_ID,
3851         .subdevice =    PCI_ANY_ID,
3852         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3853          },
3854 { /* end: all zeroes */ }
3855 };
3856 MODULE_DEVICE_TABLE(pci, pci_ids);
3857
3858 /* pci driver glue; this is a "new style" PCI driver module */
3859 static struct pci_driver net2280_pci_driver = {
3860         .name =         (char *) driver_name,
3861         .id_table =     pci_ids,
3862
3863         .probe =        net2280_probe,
3864         .remove =       net2280_remove,
3865         .shutdown =     net2280_shutdown,
3866
3867         /* FIXME add power management support */
3868 };
3869
3870 module_pci_driver(net2280_pci_driver);
3871
3872 MODULE_DESCRIPTION(DRIVER_DESC);
3873 MODULE_AUTHOR("David Brownell");
3874 MODULE_LICENSE("GPL");