drivers/usb/gadget/udc/net2280.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for the PLX NET2280 USB device controller.
   4  * Specs and errata are available from <http://www.plxtech.com>.
   5  *
   6  * PLX Technology Inc. (formerly NetChip Technology) supported the
   7  * development of this driver.
   8  *
   9  *
  10  * CODE STATUS HIGHLIGHTS
  11  *
  12  * This driver should work well with most "gadget" drivers, including
  13  * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
  14  * as well as Gadget Zero and Gadgetfs.
  15  *
  16  * DMA is enabled by default.
  17  *
  18  * MSI is enabled by default.  The legacy IRQ is used if MSI couldn't
  19  * be enabled.
  20  *
  21  * Note that almost all the errata workarounds here are only needed for
  22  * rev1 chips.  Rev1a silicon (0110) fixes almost all of them.
  23  */
  24
  25 /*
  26  * Copyright (C) 2003 David Brownell
  27  * Copyright (C) 2003-2005 PLX Technology, Inc.
  28  * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
  29  *
  30  * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
  31  *      with 2282 chip
  32  *
  33  * Modified Ricardo Ribalda Qtechnology AS  to provide compatibility
  34  *      with usb 338x chip. Based on PLX driver
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/pci.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/kernel.h>
  41 #include <linux/delay.h>
  42 #include <linux/ioport.h>
  43 #include <linux/slab.h>
  44 #include <linux/errno.h>
  45 #include <linux/init.h>
  46 #include <linux/timer.h>
  47 #include <linux/list.h>
  48 #include <linux/interrupt.h>
  49 #include <linux/moduleparam.h>
  50 #include <linux/device.h>
  51 #include <linux/usb/ch9.h>
  52 #include <linux/usb/gadget.h>
  53 #include <linux/prefetch.h>
  54 #include <linux/io.h>
  55
  56 #include <asm/byteorder.h>
  57 #include <asm/irq.h>
  58 #include <asm/unaligned.h>
  59
  60 #define DRIVER_DESC             "PLX NET228x/USB338x USB Peripheral Controller"
  61 #define DRIVER_VERSION          "2005 Sept 27/v3.0"
  62
  63 #define EP_DONTUSE              13      /* nonzero */
  64
  65 #define USE_RDK_LEDS            /* GPIO pins control three LEDs */
  66
  67
  68 static const char driver_name[] = "net2280";
  69 static const char driver_desc[] = DRIVER_DESC;
  70
  71 static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
  72 static const char ep0name[] = "ep0";
  73
  74 #define EP_INFO(_name, _caps) \
  75         { \
  76                 .name = _name, \
  77                 .caps = _caps, \
  78         }
  79
  80 static const struct {
  81         const char *name;
  82         const struct usb_ep_caps caps;
  83 } ep_info_dft[] = { /* Default endpoint configuration */
  84         EP_INFO(ep0name,
  85                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
  86         EP_INFO("ep-a",
  87                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  88         EP_INFO("ep-b",
  89                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  90         EP_INFO("ep-c",
  91                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  92         EP_INFO("ep-d",
  93                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  94         EP_INFO("ep-e",
  95                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  96         EP_INFO("ep-f",
  97                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  98         EP_INFO("ep-g",
  99                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 100         EP_INFO("ep-h",
 101                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 102 }, ep_info_adv[] = { /* Endpoints for usb3380 advance mode */
 103         EP_INFO(ep0name,
 104                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
 105         EP_INFO("ep1in",
 106                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 107         EP_INFO("ep2out",
 108                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 109         EP_INFO("ep3in",
 110                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 111         EP_INFO("ep4out",
 112                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 113         EP_INFO("ep1out",
 114                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 115         EP_INFO("ep2in",
 116                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 117         EP_INFO("ep3out",
 118                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 119         EP_INFO("ep4in",
 120                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 121 };
 122
 123 #undef EP_INFO
 124
 125 /* mode 0 == ep-{a,b,c,d} 1K fifo each
 126  * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
 127  * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
 128  */
 129 static ushort fifo_mode;
 130
 131 /* "modprobe net2280 fifo_mode=1" etc */
 132 module_param(fifo_mode, ushort, 0644);
 133
 134 /* enable_suspend -- When enabled, the driver will respond to
 135  * USB suspend requests by powering down the NET2280.  Otherwise,
 136  * USB suspend requests will be ignored.  This is acceptable for
 137  * self-powered devices
 138  */
 139 static bool enable_suspend;
 140
 141 /* "modprobe net2280 enable_suspend=1" etc */
 142 module_param(enable_suspend, bool, 0444);
 143
 144 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
 145
 146 static char *type_string(u8 bmAttributes)
 147 {
 148         switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
 149         case USB_ENDPOINT_XFER_BULK:    return "bulk";
 150         case USB_ENDPOINT_XFER_ISOC:    return "iso";
 151         case USB_ENDPOINT_XFER_INT:     return "intr";
 152         }
 153         return "control";
 154 }
 155
 156 #include "net2280.h"
 157
 158 #define valid_bit       cpu_to_le32(BIT(VALID_BIT))
 159 #define dma_done_ie     cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
 160
 161 static void ep_clear_seqnum(struct net2280_ep *ep);
 162 static void stop_activity(struct net2280 *dev,
 163                                         struct usb_gadget_driver *driver);
 164 static void ep0_start(struct net2280 *dev);
 165
 166 /*-------------------------------------------------------------------------*/
 167 static inline void enable_pciirqenb(struct net2280_ep *ep)
 168 {
 169         u32 tmp = readl(&ep->dev->regs->pciirqenb0);
 170
 171         if (ep->dev->quirks & PLX_LEGACY)
 172                 tmp |= BIT(ep->num);
 173         else
 174                 tmp |= BIT(ep_bit[ep->num]);
 175         writel(tmp, &ep->dev->regs->pciirqenb0);
 176
 177         return;
 178 }
 179
 180 static int
 181 net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 182 {
 183         struct net2280          *dev;
 184         struct net2280_ep       *ep;
 185         u32                     max;
 186         u32 tmp = 0;
 187         u32 type;
 188         unsigned long           flags;
 189         static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
 190         int ret = 0;
 191
 192         ep = container_of(_ep, struct net2280_ep, ep);
 193         if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
 194                         desc->bDescriptorType != USB_DT_ENDPOINT) {
 195                 pr_err("%s: failed at line=%d\n", __func__, __LINE__);
 196                 return -EINVAL;
 197         }
 198         dev = ep->dev;
 199         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 200                 ret = -ESHUTDOWN;
 201                 goto print_err;
 202         }
 203
 204         /* erratum 0119 workaround ties up an endpoint number */
 205         if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
 206                 ret = -EDOM;
 207                 goto print_err;
 208         }
 209
 210         if (dev->quirks & PLX_PCIE) {
 211                 if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
 212                         ret = -EDOM;
 213                         goto print_err;
 214                 }
 215                 ep->is_in = !!usb_endpoint_dir_in(desc);
 216                 if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
 217                         ret = -EINVAL;
 218                         goto print_err;
 219                 }
 220         }
 221
 222         /* sanity check ep-e/ep-f since their fifos are small */
 223         max = usb_endpoint_maxp(desc);
 224         if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
 225                 ret = -ERANGE;
 226                 goto print_err;
 227         }
 228
 229         spin_lock_irqsave(&dev->lock, flags);
 230         _ep->maxpacket = max;
 231         ep->desc = desc;
 232
 233         /* ep_reset() has already been called */
 234         ep->stopped = 0;
 235         ep->wedged = 0;
 236         ep->out_overflow = 0;
 237
 238         /* set speed-dependent max packet; may kick in high bandwidth */
 239         set_max_speed(ep, max);
 240
 241         /* set type, direction, address; reset fifo counters */
 242         writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
 243
 244         if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
 245                 tmp = readl(&ep->cfg->ep_cfg);
 246                 /* If USB ep number doesn't match hardware ep number */
 247                 if ((tmp & 0xf) != usb_endpoint_num(desc)) {
 248                         ret = -EINVAL;
 249                         spin_unlock_irqrestore(&dev->lock, flags);
 250                         goto print_err;
 251                 }
 252                 if (ep->is_in)
 253                         tmp &= ~USB3380_EP_CFG_MASK_IN;
 254                 else
 255                         tmp &= ~USB3380_EP_CFG_MASK_OUT;
 256         }
 257         type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 258         if (type == USB_ENDPOINT_XFER_INT) {
 259                 /* erratum 0105 workaround prevents hs NYET */
 260                 if (dev->chiprev == 0100 &&
 261                                 dev->gadget.speed == USB_SPEED_HIGH &&
 262                                 !(desc->bEndpointAddress & USB_DIR_IN))
 263                         writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
 264                                 &ep->regs->ep_rsp);
 265         } else if (type == USB_ENDPOINT_XFER_BULK) {
 266                 /* catch some particularly blatant driver bugs */
 267                 if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
 268                     (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
 269                     (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
 270                         spin_unlock_irqrestore(&dev->lock, flags);
 271                         ret = -ERANGE;
 272                         goto print_err;
 273                 }
 274         }
 275         ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC);
 276         /* Enable this endpoint */
 277         if (dev->quirks & PLX_LEGACY) {
 278                 tmp |= type << ENDPOINT_TYPE;
 279                 tmp |= desc->bEndpointAddress;
 280                 /* default full fifo lines */
 281                 tmp |= (4 << ENDPOINT_BYTE_COUNT);
 282                 tmp |= BIT(ENDPOINT_ENABLE);
 283                 ep->is_in = (tmp & USB_DIR_IN) != 0;
 284         } else {
 285                 /* In Legacy mode, only OUT endpoints are used */
 286                 if (dev->enhanced_mode && ep->is_in) {
 287                         tmp |= type << IN_ENDPOINT_TYPE;
 288                         tmp |= BIT(IN_ENDPOINT_ENABLE);
 289                 } else {
 290                         tmp |= type << OUT_ENDPOINT_TYPE;
 291                         tmp |= BIT(OUT_ENDPOINT_ENABLE);
 292                         tmp |= (ep->is_in << ENDPOINT_DIRECTION);
 293                 }
 294
 295                 tmp |= (4 << ENDPOINT_BYTE_COUNT);
 296                 if (!dev->enhanced_mode)
 297                         tmp |= usb_endpoint_num(desc);
 298                 tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
 299         }
 300
 301         /* Make sure all the registers are written before ep_rsp*/
 302         wmb();
 303
 304         /* for OUT transfers, block the rx fifo until a read is posted */
 305         if (!ep->is_in)
 306                 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 307         else if (!(dev->quirks & PLX_2280)) {
 308                 /* Added for 2282, Don't use nak packets on an in endpoint,
 309                  * this was ignored on 2280
 310                  */
 311                 writel(BIT(CLEAR_NAK_OUT_PACKETS) |
 312                         BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
 313         }
 314
 315         if (dev->quirks & PLX_PCIE)
 316                 ep_clear_seqnum(ep);
 317         writel(tmp, &ep->cfg->ep_cfg);
 318
 319         /* enable irqs */
 320         if (!ep->dma) {                         /* pio, per-packet */
 321                 enable_pciirqenb(ep);
 322
 323                 tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
 324                         BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
 325                 if (dev->quirks & PLX_2280)
 326                         tmp |= readl(&ep->regs->ep_irqenb);
 327                 writel(tmp, &ep->regs->ep_irqenb);
 328         } else {                                /* dma, per-request */
 329                 tmp = BIT((8 + ep->num));       /* completion */
 330                 tmp |= readl(&dev->regs->pciirqenb1);
 331                 writel(tmp, &dev->regs->pciirqenb1);
 332
 333                 /* for short OUT transfers, dma completions can't
 334                  * advance the queue; do it pio-style, by hand.
 335                  * NOTE erratum 0112 workaround #2
 336                  */
 337                 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
 338                         tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
 339                         writel(tmp, &ep->regs->ep_irqenb);
 340
 341                         enable_pciirqenb(ep);
 342                 }
 343         }
 344
 345         tmp = desc->bEndpointAddress;
 346         ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
 347                 _ep->name, tmp & 0x0f, DIR_STRING(tmp),
 348                 type_string(desc->bmAttributes),
 349                 ep->dma ? "dma" : "pio", max);
 350
 351         /* pci writes may still be posted */
 352         spin_unlock_irqrestore(&dev->lock, flags);
 353         return ret;
 354
 355 print_err:
 356         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
 357         return ret;
 358 }
 359
 360 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
 361 {
 362         u32     result;
 363
 364         do {
 365                 result = readl(ptr);
 366                 if (result == ~(u32)0)          /* "device unplugged" */
 367                         return -ENODEV;
 368                 result &= mask;
 369                 if (result == done)
 370                         return 0;
 371                 udelay(1);
 372                 usec--;
 373         } while (usec > 0);
 374         return -ETIMEDOUT;
 375 }
 376
 377 static const struct usb_ep_ops net2280_ep_ops;
 378
 379 static void ep_reset_228x(struct net2280_regs __iomem *regs,
 380                           struct net2280_ep *ep)
 381 {
 382         u32             tmp;
 383
 384         ep->desc = NULL;
 385         INIT_LIST_HEAD(&ep->queue);
 386
 387         usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 388         ep->ep.ops = &net2280_ep_ops;
 389
 390         /* disable the dma, irqs, endpoint... */
 391         if (ep->dma) {
 392                 writel(0, &ep->dma->dmactl);
 393                 writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 394                         BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
 395                         BIT(DMA_ABORT),
 396                         &ep->dma->dmastat);
 397
 398                 tmp = readl(&regs->pciirqenb0);
 399                 tmp &= ~BIT(ep->num);
 400                 writel(tmp, &regs->pciirqenb0);
 401         } else {
 402                 tmp = readl(&regs->pciirqenb1);
 403                 tmp &= ~BIT((8 + ep->num));     /* completion */
 404                 writel(tmp, &regs->pciirqenb1);
 405         }
 406         writel(0, &ep->regs->ep_irqenb);
 407
 408         /* init to our chosen defaults, notably so that we NAK OUT
 409          * packets until the driver queues a read (+note erratum 0112)
 410          */
 411         if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
 412                 tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
 413                 BIT(SET_NAK_OUT_PACKETS) |
 414                 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 415                 BIT(CLEAR_INTERRUPT_MODE);
 416         } else {
 417                 /* added for 2282 */
 418                 tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
 419                 BIT(CLEAR_NAK_OUT_PACKETS) |
 420                 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 421                 BIT(CLEAR_INTERRUPT_MODE);
 422         }
 423
 424         if (ep->num != 0) {
 425                 tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
 426                         BIT(CLEAR_ENDPOINT_HALT);
 427         }
 428         writel(tmp, &ep->regs->ep_rsp);
 429
 430         /* scrub most status bits, and flush any fifo state */
 431         if (ep->dev->quirks & PLX_2280)
 432                 tmp = BIT(FIFO_OVERFLOW) |
 433                         BIT(FIFO_UNDERFLOW);
 434         else
 435                 tmp = 0;
 436
 437         writel(tmp | BIT(TIMEOUT) |
 438                 BIT(USB_STALL_SENT) |
 439                 BIT(USB_IN_NAK_SENT) |
 440                 BIT(USB_IN_ACK_RCVD) |
 441                 BIT(USB_OUT_PING_NAK_SENT) |
 442                 BIT(USB_OUT_ACK_SENT) |
 443                 BIT(FIFO_FLUSH) |
 444                 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 445                 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 446                 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 447                 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 448                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 449                 BIT(DATA_IN_TOKEN_INTERRUPT),
 450                 &ep->regs->ep_stat);
 451
 452         /* fifo size is handled separately */
 453 }
 454
 455 static void ep_reset_338x(struct net2280_regs __iomem *regs,
 456                                         struct net2280_ep *ep)
 457 {
 458         u32 tmp, dmastat;
 459
 460         ep->desc = NULL;
 461         INIT_LIST_HEAD(&ep->queue);
 462
 463         usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 464         ep->ep.ops = &net2280_ep_ops;
 465
 466         /* disable the dma, irqs, endpoint... */
 467         if (ep->dma) {
 468                 writel(0, &ep->dma->dmactl);
 469                 writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
 470                        BIT(DMA_PAUSE_DONE_INTERRUPT) |
 471                        BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 472                        BIT(DMA_TRANSACTION_DONE_INTERRUPT),
 473                        /* | BIT(DMA_ABORT), */
 474                        &ep->dma->dmastat);
 475
 476                 dmastat = readl(&ep->dma->dmastat);
 477                 if (dmastat == 0x5002) {
 478                         ep_warn(ep->dev, "The dmastat return = %x!!\n",
 479                                dmastat);
 480                         writel(0x5a, &ep->dma->dmastat);
 481                 }
 482
 483                 tmp = readl(&regs->pciirqenb0);
 484                 tmp &= ~BIT(ep_bit[ep->num]);
 485                 writel(tmp, &regs->pciirqenb0);
 486         } else {
 487                 if (ep->num < 5) {
 488                         tmp = readl(&regs->pciirqenb1);
 489                         tmp &= ~BIT((8 + ep->num));     /* completion */
 490                         writel(tmp, &regs->pciirqenb1);
 491                 }
 492         }
 493         writel(0, &ep->regs->ep_irqenb);
 494
 495         writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 496                BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 497                BIT(FIFO_OVERFLOW) |
 498                BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 499                BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 500                BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 501                BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
 502
 503         tmp = readl(&ep->cfg->ep_cfg);
 504         if (ep->is_in)
 505                 tmp &= ~USB3380_EP_CFG_MASK_IN;
 506         else
 507                 tmp &= ~USB3380_EP_CFG_MASK_OUT;
 508         writel(tmp, &ep->cfg->ep_cfg);
 509 }
 510
 511 static void nuke(struct net2280_ep *);
 512
 513 static int net2280_disable(struct usb_ep *_ep)
 514 {
 515         struct net2280_ep       *ep;
 516         unsigned long           flags;
 517
 518         ep = container_of(_ep, struct net2280_ep, ep);
 519         if (!_ep || !ep->desc || _ep->name == ep0name) {
 520                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
 521                 return -EINVAL;
 522         }
 523         spin_lock_irqsave(&ep->dev->lock, flags);
 524         nuke(ep);
 525
 526         if (ep->dev->quirks & PLX_PCIE)
 527                 ep_reset_338x(ep->dev->regs, ep);
 528         else
 529                 ep_reset_228x(ep->dev->regs, ep);
 530
 531         ep_vdbg(ep->dev, "disabled %s %s\n",
 532                         ep->dma ? "dma" : "pio", _ep->name);
 533
 534         /* synch memory views with the device */
 535         (void)readl(&ep->cfg->ep_cfg);
 536
 537         if (!ep->dma && ep->num >= 1 && ep->num <= 4)
 538                 ep->dma = &ep->dev->dma[ep->num - 1];
 539
 540         spin_unlock_irqrestore(&ep->dev->lock, flags);
 541         return 0;
 542 }
 543
 544 /*-------------------------------------------------------------------------*/
 545
 546 static struct usb_request
 547 *net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 548 {
 549         struct net2280_ep       *ep;
 550         struct net2280_request  *req;
 551
 552         if (!_ep) {
 553                 pr_err("%s: Invalid ep\n", __func__);
 554                 return NULL;
 555         }
 556         ep = container_of(_ep, struct net2280_ep, ep);
 557
 558         req = kzalloc(sizeof(*req), gfp_flags);
 559         if (!req)
 560                 return NULL;
 561
 562         INIT_LIST_HEAD(&req->queue);
 563
 564         /* this dma descriptor may be swapped with the previous dummy */
 565         if (ep->dma) {
 566                 struct net2280_dma      *td;
 567
 568                 td = dma_pool_alloc(ep->dev->requests, gfp_flags,
 569                                 &req->td_dma);
 570                 if (!td) {
 571                         kfree(req);
 572                         return NULL;
 573                 }
 574                 td->dmacount = 0;       /* not VALID */
 575                 td->dmadesc = td->dmaaddr;
 576                 req->td = td;
 577         }
 578         return &req->req;
 579 }
 580
 581 static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
 582 {
 583         struct net2280_ep       *ep;
 584         struct net2280_request  *req;
 585
 586         ep = container_of(_ep, struct net2280_ep, ep);
 587         if (!_ep || !_req) {
 588                 dev_err(&ep->dev->pdev->dev, "%s: Invalid ep=%p or req=%p\n",
 589                                                         __func__, _ep, _req);
 590                 return;
 591         }
 592
 593         req = container_of(_req, struct net2280_request, req);
 594         WARN_ON(!list_empty(&req->queue));
 595         if (req->td)
 596                 dma_pool_free(ep->dev->requests, req->td, req->td_dma);
 597         kfree(req);
 598 }
 599
 600 /*-------------------------------------------------------------------------*/
 601
 602 /* load a packet into the fifo we use for usb IN transfers.
 603  * works for all endpoints.
 604  *
 605  * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
 606  * at a time, but this code is simpler because it knows it only writes
 607  * one packet.  ep-a..ep-d should use dma instead.
 608  */
 609 static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
 610 {
 611         struct net2280_ep_regs  __iomem *regs = ep->regs;
 612         u8                      *buf;
 613         u32                     tmp;
 614         unsigned                count, total;
 615
 616         /* INVARIANT:  fifo is currently empty. (testable) */
 617
 618         if (req) {
 619                 buf = req->buf + req->actual;
 620                 prefetch(buf);
 621                 total = req->length - req->actual;
 622         } else {
 623                 total = 0;
 624                 buf = NULL;
 625         }
 626
 627         /* write just one packet at a time */
 628         count = ep->ep.maxpacket;
 629         if (count > total)      /* min() cannot be used on a bitfield */
 630                 count = total;
 631
 632         ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
 633                         ep->ep.name, count,
 634                         (count != ep->ep.maxpacket) ? " (short)" : "",
 635                         req);
 636         while (count >= 4) {
 637                 /* NOTE be careful if you try to align these. fifo lines
 638                  * should normally be full (4 bytes) and successive partial
 639                  * lines are ok only in certain cases.
 640                  */
 641                 tmp = get_unaligned((u32 *)buf);
 642                 cpu_to_le32s(&tmp);
 643                 writel(tmp, &regs->ep_data);
 644                 buf += 4;
 645                 count -= 4;
 646         }
 647
 648         /* last fifo entry is "short" unless we wrote a full packet.
 649          * also explicitly validate last word in (periodic) transfers
 650          * when maxpacket is not a multiple of 4 bytes.
 651          */
 652         if (count || total < ep->ep.maxpacket) {
 653                 tmp = count ? get_unaligned((u32 *)buf) : count;
 654                 cpu_to_le32s(&tmp);
 655                 set_fifo_bytecount(ep, count & 0x03);
 656                 writel(tmp, &regs->ep_data);
 657         }
 658
 659         /* pci writes may still be posted */
 660 }
 661
 662 /* work around erratum 0106: PCI and USB race over the OUT fifo.
 663  * caller guarantees chiprev 0100, out endpoint is NAKing, and
 664  * there's no real data in the fifo.
 665  *
 666  * NOTE:  also used in cases where that erratum doesn't apply:
 667  * where the host wrote "too much" data to us.
 668  */
 669 static void out_flush(struct net2280_ep *ep)
 670 {
 671         u32     __iomem *statp;
 672         u32     tmp;
 673
 674         statp = &ep->regs->ep_stat;
 675
 676         tmp = readl(statp);
 677         if (tmp & BIT(NAK_OUT_PACKETS)) {
 678                 ep_dbg(ep->dev, "%s %s %08x !NAK\n",
 679                         ep->ep.name, __func__, tmp);
 680                 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 681         }
 682
 683         writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 684                 BIT(DATA_PACKET_RECEIVED_INTERRUPT),
 685                 statp);
 686         writel(BIT(FIFO_FLUSH), statp);
 687         /* Make sure that stap is written */
 688         mb();
 689         tmp = readl(statp);
 690         if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
 691                         /* high speed did bulk NYET; fifo isn't filling */
 692                         ep->dev->gadget.speed == USB_SPEED_FULL) {
 693                 unsigned        usec;
 694
 695                 usec = 50;              /* 64 byte bulk/interrupt */
 696                 handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
 697                                 BIT(USB_OUT_PING_NAK_SENT), usec);
 698                 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
 699         }
 700 }
 701
 702 /* unload packet(s) from the fifo we use for usb OUT transfers.
 703  * returns true iff the request completed, because of short packet
 704  * or the request buffer having filled with full packets.
 705  *
 706  * for ep-a..ep-d this will read multiple packets out when they
 707  * have been accepted.
 708  */
 709 static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
 710 {
 711         struct net2280_ep_regs  __iomem *regs = ep->regs;
 712         u8                      *buf = req->req.buf + req->req.actual;
 713         unsigned                count, tmp, is_short;
 714         unsigned                cleanup = 0, prevent = 0;
 715
 716         /* erratum 0106 ... packets coming in during fifo reads might
 717          * be incompletely rejected.  not all cases have workarounds.
 718          */
 719         if (ep->dev->chiprev == 0x0100 &&
 720                         ep->dev->gadget.speed == USB_SPEED_FULL) {
 721                 udelay(1);
 722                 tmp = readl(&ep->regs->ep_stat);
 723                 if ((tmp & BIT(NAK_OUT_PACKETS)))
 724                         cleanup = 1;
 725                 else if ((tmp & BIT(FIFO_FULL))) {
 726                         start_out_naking(ep);
 727                         prevent = 1;
 728                 }
 729                 /* else: hope we don't see the problem */
 730         }
 731
 732         /* never overflow the rx buffer. the fifo reads packets until
 733          * it sees a short one; we might not be ready for them all.
 734          */
 735         prefetchw(buf);
 736         count = readl(&regs->ep_avail);
 737         if (unlikely(count == 0)) {
 738                 udelay(1);
 739                 tmp = readl(&ep->regs->ep_stat);
 740                 count = readl(&regs->ep_avail);
 741                 /* handled that data already? */
 742                 if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
 743                         return 0;
 744         }
 745
 746         tmp = req->req.length - req->req.actual;
 747         if (count > tmp) {
 748                 /* as with DMA, data overflow gets flushed */
 749                 if ((tmp % ep->ep.maxpacket) != 0) {
 750                         ep_err(ep->dev,
 751                                 "%s out fifo %d bytes, expected %d\n",
 752                                 ep->ep.name, count, tmp);
 753                         req->req.status = -EOVERFLOW;
 754                         cleanup = 1;
 755                         /* NAK_OUT_PACKETS will be set, so flushing is safe;
 756                          * the next read will start with the next packet
 757                          */
 758                 } /* else it's a ZLP, no worries */
 759                 count = tmp;
 760         }
 761         req->req.actual += count;
 762
 763         is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
 764
 765         ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
 766                         ep->ep.name, count, is_short ? " (short)" : "",
 767                         cleanup ? " flush" : "", prevent ? " nak" : "",
 768                         req, req->req.actual, req->req.length);
 769
 770         while (count >= 4) {
 771                 tmp = readl(&regs->ep_data);
 772                 cpu_to_le32s(&tmp);
 773                 put_unaligned(tmp, (u32 *)buf);
 774                 buf += 4;
 775                 count -= 4;
 776         }
 777         if (count) {
 778                 tmp = readl(&regs->ep_data);
 779                 /* LE conversion is implicit here: */
 780                 do {
 781                         *buf++ = (u8) tmp;
 782                         tmp >>= 8;
 783                 } while (--count);
 784         }
 785         if (cleanup)
 786                 out_flush(ep);
 787         if (prevent) {
 788                 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 789                 (void) readl(&ep->regs->ep_rsp);
 790         }
 791
 792         return is_short || ((req->req.actual == req->req.length) &&
 793                         !req->req.zero);
 794 }
 795
 796 /* fill out dma descriptor to match a given request */
 797 static void fill_dma_desc(struct net2280_ep *ep,
 798                                         struct net2280_request *req, int valid)
 799 {
 800         struct net2280_dma      *td = req->td;
 801         u32                     dmacount = req->req.length;
 802
 803         /* don't let DMA continue after a short OUT packet,
 804          * so overruns can't affect the next transfer.
 805          * in case of overruns on max-size packets, we can't
 806          * stop the fifo from filling but we can flush it.
 807          */
 808         if (ep->is_in)
 809                 dmacount |= BIT(DMA_DIRECTION);
 810         if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
 811                                         !(ep->dev->quirks & PLX_2280))
 812                 dmacount |= BIT(END_OF_CHAIN);
 813
 814         req->valid = valid;
 815         if (valid)
 816                 dmacount |= BIT(VALID_BIT);
 817         dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
 818
 819         /* td->dmadesc = previously set by caller */
 820         td->dmaaddr = cpu_to_le32 (req->req.dma);
 821
 822         /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
 823         wmb();
 824         td->dmacount = cpu_to_le32(dmacount);
 825 }
 826
 827 static const u32 dmactl_default =
 828                 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 829                 BIT(DMA_CLEAR_COUNT_ENABLE) |
 830                 /* erratum 0116 workaround part 1 (use POLLING) */
 831                 (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
 832                 BIT(DMA_VALID_BIT_POLLING_ENABLE) |
 833                 BIT(DMA_VALID_BIT_ENABLE) |
 834                 BIT(DMA_SCATTER_GATHER_ENABLE) |
 835                 /* erratum 0116 workaround part 2 (no AUTOSTART) */
 836                 BIT(DMA_ENABLE);
 837
 838 static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
 839 {
 840         handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
 841 }
 842
 843 static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
 844 {
 845         writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
 846         spin_stop_dma(dma);
 847 }
 848
 849 static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
 850 {
 851         struct net2280_dma_regs __iomem *dma = ep->dma;
 852         unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
 853
 854         if (!(ep->dev->quirks & PLX_2280))
 855                 tmp |= BIT(END_OF_CHAIN);
 856
 857         writel(tmp, &dma->dmacount);
 858         writel(readl(&dma->dmastat), &dma->dmastat);
 859
 860         writel(td_dma, &dma->dmadesc);
 861         if (ep->dev->quirks & PLX_PCIE)
 862                 dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
 863         writel(dmactl, &dma->dmactl);
 864
 865         /* erratum 0116 workaround part 3:  pci arbiter away from net2280 */
 866         (void) readl(&ep->dev->pci->pcimstctl);
 867
 868         writel(BIT(DMA_START), &dma->dmastat);
 869 }
 870
 871 static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
 872 {
 873         u32                     tmp;
 874         struct net2280_dma_regs __iomem *dma = ep->dma;
 875
 876         /* FIXME can't use DMA for ZLPs */
 877
 878         /* on this path we "know" there's no dma active (yet) */
 879         WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
 880         writel(0, &ep->dma->dmactl);
 881
 882         /* previous OUT packet might have been short */
 883         if (!ep->is_in && (readl(&ep->regs->ep_stat) &
 884                                 BIT(NAK_OUT_PACKETS))) {
 885                 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
 886                         &ep->regs->ep_stat);
 887
 888                 tmp = readl(&ep->regs->ep_avail);
 889                 if (tmp) {
 890                         writel(readl(&dma->dmastat), &dma->dmastat);
 891
 892                         /* transfer all/some fifo data */
 893                         writel(req->req.dma, &dma->dmaaddr);
 894                         tmp = min(tmp, req->req.length);
 895
 896                         /* dma irq, faking scatterlist status */
 897                         req->td->dmacount = cpu_to_le32(req->req.length - tmp);
 898                         writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
 899                                         &dma->dmacount);
 900                         req->td->dmadesc = 0;
 901                         req->valid = 1;
 902
 903                         writel(BIT(DMA_ENABLE), &dma->dmactl);
 904                         writel(BIT(DMA_START), &dma->dmastat);
 905                         return;
 906                 }
 907                 stop_out_naking(ep);
 908         }
 909
 910         tmp = dmactl_default;
 911
 912         /* force packet boundaries between dma requests, but prevent the
 913          * controller from automagically writing a last "short" packet
 914          * (zero length) unless the driver explicitly said to do that.
 915          */
 916         if (ep->is_in) {
 917                 if (likely((req->req.length % ep->ep.maxpacket) ||
 918                                                         req->req.zero)){
 919                         tmp |= BIT(DMA_FIFO_VALIDATE);
 920                         ep->in_fifo_validate = 1;
 921                 } else
 922                         ep->in_fifo_validate = 0;
 923         }
 924
 925         /* init req->td, pointing to the current dummy */
 926         req->td->dmadesc = cpu_to_le32 (ep->td_dma);
 927         fill_dma_desc(ep, req, 1);
 928
 929         req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
 930
 931         start_queue(ep, tmp, req->td_dma);
 932 }
 933
 934 static inline void
 935 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
 936 {
 937         struct net2280_dma      *end;
 938         dma_addr_t              tmp;
 939
 940         /* swap new dummy for old, link; fill and maybe activate */
 941         end = ep->dummy;
 942         ep->dummy = req->td;
 943         req->td = end;
 944
 945         tmp = ep->td_dma;
 946         ep->td_dma = req->td_dma;
 947         req->td_dma = tmp;
 948
 949         end->dmadesc = cpu_to_le32 (ep->td_dma);
 950
 951         fill_dma_desc(ep, req, valid);
 952 }
 953
 954 static void
 955 done(struct net2280_ep *ep, struct net2280_request *req, int status)
 956 {
 957         struct net2280          *dev;
 958         unsigned                stopped = ep->stopped;
 959
 960         list_del_init(&req->queue);
 961
 962         if (req->req.status == -EINPROGRESS)
 963                 req->req.status = status;
 964         else
 965                 status = req->req.status;
 966
 967         dev = ep->dev;
 968         if (ep->dma)
 969                 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
 970
 971         if (status && status != -ESHUTDOWN)
 972                 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
 973                         ep->ep.name, &req->req, status,
 974                         req->req.actual, req->req.length);
 975
 976         /* don't modify queue heads during completion callback */
 977         ep->stopped = 1;
 978         spin_unlock(&dev->lock);
 979         usb_gadget_giveback_request(&ep->ep, &req->req);
 980         spin_lock(&dev->lock);
 981         ep->stopped = stopped;
 982 }
 983
 984 /*-------------------------------------------------------------------------*/
 985
 986 static int
 987 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 988 {
 989         struct net2280_request  *req;
 990         struct net2280_ep       *ep;
 991         struct net2280          *dev;
 992         unsigned long           flags;
 993         int ret = 0;
 994
 995         /* we always require a cpu-view buffer, so that we can
 996          * always use pio (as fallback or whatever).
 997          */
 998         ep = container_of(_ep, struct net2280_ep, ep);
 999         if (!_ep || (!ep->desc && ep->num != 0)) {
1000                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1001                 return -EINVAL;
1002         }
1003         req = container_of(_req, struct net2280_request, req);
1004         if (!_req || !_req->complete || !_req->buf ||
1005                                 !list_empty(&req->queue)) {
1006                 ret = -EINVAL;
1007                 goto print_err;
1008         }
1009         if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
1010                 ret = -EDOM;
1011                 goto print_err;
1012         }
1013         dev = ep->dev;
1014         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1015                 ret = -ESHUTDOWN;
1016                 goto print_err;
1017         }
1018
1019         /* FIXME implement PIO fallback for ZLPs with DMA */
1020         if (ep->dma && _req->length == 0) {
1021                 ret = -EOPNOTSUPP;
1022                 goto print_err;
1023         }
1024
1025         /* set up dma mapping in case the caller didn't */
1026         if (ep->dma) {
1027                 ret = usb_gadget_map_request(&dev->gadget, _req,
1028                                 ep->is_in);
1029                 if (ret)
1030                         goto print_err;
1031         }
1032
1033         ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
1034                         _ep->name, _req, _req->length, _req->buf);
1035
1036         spin_lock_irqsave(&dev->lock, flags);
1037
1038         _req->status = -EINPROGRESS;
1039         _req->actual = 0;
1040
1041         /* kickstart this i/o queue? */
1042         if  (list_empty(&ep->queue) && !ep->stopped &&
1043                 !((dev->quirks & PLX_PCIE) && ep->dma &&
1044                   (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1045
1046                 /* use DMA if the endpoint supports it, else pio */
1047                 if (ep->dma)
1048                         start_dma(ep, req);
1049                 else {
1050                         /* maybe there's no control data, just status ack */
1051                         if (ep->num == 0 && _req->length == 0) {
1052                                 allow_status(ep);
1053                                 done(ep, req, 0);
1054                                 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1055                                 goto done;
1056                         }
1057
1058                         /* PIO ... stuff the fifo, or unblock it.  */
1059                         if (ep->is_in)
1060                                 write_fifo(ep, _req);
1061                         else if (list_empty(&ep->queue)) {
1062                                 u32     s;
1063
1064                                 /* OUT FIFO might have packet(s) buffered */
1065                                 s = readl(&ep->regs->ep_stat);
1066                                 if ((s & BIT(FIFO_EMPTY)) == 0) {
1067                                         /* note:  _req->short_not_ok is
1068                                          * ignored here since PIO _always_
1069                                          * stops queue advance here, and
1070                                          * _req->status doesn't change for
1071                                          * short reads (only _req->actual)
1072                                          */
1073                                         if (read_fifo(ep, req) &&
1074                                                         ep->num == 0) {
1075                                                 done(ep, req, 0);
1076                                                 allow_status(ep);
1077                                                 /* don't queue it */
1078                                                 req = NULL;
1079                                         } else if (read_fifo(ep, req) &&
1080                                                         ep->num != 0) {
1081                                                 done(ep, req, 0);
1082                                                 req = NULL;
1083                                         } else
1084                                                 s = readl(&ep->regs->ep_stat);
1085                                 }
1086
1087                                 /* don't NAK, let the fifo fill */
1088                                 if (req && (s & BIT(NAK_OUT_PACKETS)))
1089                                         writel(BIT(CLEAR_NAK_OUT_PACKETS),
1090                                                         &ep->regs->ep_rsp);
1091                         }
1092                 }
1093
1094         } else if (ep->dma) {
1095                 int     valid = 1;
1096
1097                 if (ep->is_in) {
1098                         int     expect;
1099
1100                         /* preventing magic zlps is per-engine state, not
1101                          * per-transfer; irq logic must recover hiccups.
1102                          */
1103                         expect = likely(req->req.zero ||
1104                                 (req->req.length % ep->ep.maxpacket));
1105                         if (expect != ep->in_fifo_validate)
1106                                 valid = 0;
1107                 }
1108                 queue_dma(ep, req, valid);
1109
1110         } /* else the irq handler advances the queue. */
1111
1112         ep->responded = 1;
1113         if (req)
1114                 list_add_tail(&req->queue, &ep->queue);
1115 done:
1116         spin_unlock_irqrestore(&dev->lock, flags);
1117
1118         /* pci writes may still be posted */
1119         return ret;
1120
1121 print_err:
1122         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1123         return ret;
1124 }
1125
1126 static inline void
1127 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1128                 int status)
1129 {
1130         req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1131         done(ep, req, status);
1132 }
1133
1134 static int scan_dma_completions(struct net2280_ep *ep)
1135 {
1136         int num_completed = 0;
1137
1138         /* only look at descriptors that were "naturally" retired,
1139          * so fifo and list head state won't matter
1140          */
1141         while (!list_empty(&ep->queue)) {
1142                 struct net2280_request  *req;
1143                 u32 req_dma_count;
1144
1145                 req = list_entry(ep->queue.next,
1146                                 struct net2280_request, queue);
1147                 if (!req->valid)
1148                         break;
1149                 rmb();
1150                 req_dma_count = le32_to_cpup(&req->td->dmacount);
1151                 if ((req_dma_count & BIT(VALID_BIT)) != 0)
1152                         break;
1153
1154                 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1155                  * cases where DMA must be aborted; this code handles
1156                  * all non-abort DMA completions.
1157                  */
1158                 if (unlikely(req->td->dmadesc == 0)) {
1159                         /* paranoia */
1160                         u32 const ep_dmacount = readl(&ep->dma->dmacount);
1161
1162                         if (ep_dmacount & DMA_BYTE_COUNT_MASK)
1163                                 break;
1164                         /* single transfer mode */
1165                         dma_done(ep, req, req_dma_count, 0);
1166                         num_completed++;
1167                         break;
1168                 } else if (!ep->is_in &&
1169                            (req->req.length % ep->ep.maxpacket) &&
1170                            !(ep->dev->quirks & PLX_PCIE)) {
1171
1172                         u32 const ep_stat = readl(&ep->regs->ep_stat);
1173                         /* AVOID TROUBLE HERE by not issuing short reads from
1174                          * your gadget driver.  That helps avoids errata 0121,
1175                          * 0122, and 0124; not all cases trigger the warning.
1176                          */
1177                         if ((ep_stat & BIT(NAK_OUT_PACKETS)) == 0) {
1178                                 ep_warn(ep->dev, "%s lost packet sync!\n",
1179                                                 ep->ep.name);
1180                                 req->req.status = -EOVERFLOW;
1181                         } else {
1182                                 u32 const ep_avail = readl(&ep->regs->ep_avail);
1183                                 if (ep_avail) {
1184                                         /* fifo gets flushed later */
1185                                         ep->out_overflow = 1;
1186                                         ep_dbg(ep->dev,
1187                                                 "%s dma, discard %d len %d\n",
1188                                                 ep->ep.name, ep_avail,
1189                                                 req->req.length);
1190                                         req->req.status = -EOVERFLOW;
1191                                 }
1192                         }
1193                 }
1194                 dma_done(ep, req, req_dma_count, 0);
1195                 num_completed++;
1196         }
1197
1198         return num_completed;
1199 }
1200
1201 static void restart_dma(struct net2280_ep *ep)
1202 {
1203         struct net2280_request  *req;
1204
1205         if (ep->stopped)
1206                 return;
1207         req = list_entry(ep->queue.next, struct net2280_request, queue);
1208
1209         start_dma(ep, req);
1210 }
1211
1212 static void abort_dma(struct net2280_ep *ep)
1213 {
1214         /* abort the current transfer */
1215         if (likely(!list_empty(&ep->queue))) {
1216                 /* FIXME work around errata 0121, 0122, 0124 */
1217                 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1218                 spin_stop_dma(ep->dma);
1219         } else
1220                 stop_dma(ep->dma);
1221         scan_dma_completions(ep);
1222 }
1223
1224 /* dequeue ALL requests */
1225 static void nuke(struct net2280_ep *ep)
1226 {
1227         struct net2280_request  *req;
1228
1229         /* called with spinlock held */
1230         ep->stopped = 1;
1231         if (ep->dma)
1232                 abort_dma(ep);
1233         while (!list_empty(&ep->queue)) {
1234                 req = list_entry(ep->queue.next,
1235                                 struct net2280_request,
1236                                 queue);
1237                 done(ep, req, -ESHUTDOWN);
1238         }
1239 }
1240
1241 /* dequeue JUST ONE request */
1242 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1243 {
1244         struct net2280_ep       *ep;
1245         struct net2280_request  *req;
1246         unsigned long           flags;
1247         u32                     dmactl;
1248         int                     stopped;
1249
1250         ep = container_of(_ep, struct net2280_ep, ep);
1251         if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1252                 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1253                                                 __func__, _ep, _req);
1254                 return -EINVAL;
1255         }
1256
1257         spin_lock_irqsave(&ep->dev->lock, flags);
1258         stopped = ep->stopped;
1259
1260         /* quiesce dma while we patch the queue */
1261         dmactl = 0;
1262         ep->stopped = 1;
1263         if (ep->dma) {
1264                 dmactl = readl(&ep->dma->dmactl);
1265                 /* WARNING erratum 0127 may kick in ... */
1266                 stop_dma(ep->dma);
1267                 scan_dma_completions(ep);
1268         }
1269
1270         /* make sure it's still queued on this endpoint */
1271         list_for_each_entry(req, &ep->queue, queue) {
1272                 if (&req->req == _req)
1273                         break;
1274         }
1275         if (&req->req != _req) {
1276                 ep->stopped = stopped;
1277                 spin_unlock_irqrestore(&ep->dev->lock, flags);
1278                 ep_dbg(ep->dev, "%s: Request mismatch\n", __func__);
1279                 return -EINVAL;
1280         }
1281
1282         /* queue head may be partially complete. */
1283         if (ep->queue.next == &req->queue) {
1284                 if (ep->dma) {
1285                         ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1286                         _req->status = -ECONNRESET;
1287                         abort_dma(ep);
1288                         if (likely(ep->queue.next == &req->queue)) {
1289                                 /* NOTE: misreports single-transfer mode*/
1290                                 req->td->dmacount = 0;  /* invalidate */
1291                                 dma_done(ep, req,
1292                                         readl(&ep->dma->dmacount),
1293                                         -ECONNRESET);
1294                         }
1295                 } else {
1296                         ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1297                         done(ep, req, -ECONNRESET);
1298                 }
1299                 req = NULL;
1300         }
1301
1302         if (req)
1303                 done(ep, req, -ECONNRESET);
1304         ep->stopped = stopped;
1305
1306         if (ep->dma) {
1307                 /* turn off dma on inactive queues */
1308                 if (list_empty(&ep->queue))
1309                         stop_dma(ep->dma);
1310                 else if (!ep->stopped) {
1311                         /* resume current request, or start new one */
1312                         if (req)
1313                                 writel(dmactl, &ep->dma->dmactl);
1314                         else
1315                                 start_dma(ep, list_entry(ep->queue.next,
1316                                         struct net2280_request, queue));
1317                 }
1318         }
1319
1320         spin_unlock_irqrestore(&ep->dev->lock, flags);
1321         return 0;
1322 }
1323
1324 /*-------------------------------------------------------------------------*/
1325
1326 static int net2280_fifo_status(struct usb_ep *_ep);
1327
1328 static int
1329 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1330 {
1331         struct net2280_ep       *ep;
1332         unsigned long           flags;
1333         int                     retval = 0;
1334
1335         ep = container_of(_ep, struct net2280_ep, ep);
1336         if (!_ep || (!ep->desc && ep->num != 0)) {
1337                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1338                 return -EINVAL;
1339         }
1340         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1341                 retval = -ESHUTDOWN;
1342                 goto print_err;
1343         }
1344         if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1345                                                 == USB_ENDPOINT_XFER_ISOC) {
1346                 retval = -EINVAL;
1347                 goto print_err;
1348         }
1349
1350         spin_lock_irqsave(&ep->dev->lock, flags);
1351         if (!list_empty(&ep->queue)) {
1352                 retval = -EAGAIN;
1353                 goto print_unlock;
1354         } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1355                 retval = -EAGAIN;
1356                 goto print_unlock;
1357         } else {
1358                 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1359                                 value ? "set" : "clear",
1360                                 wedged ? "wedge" : "halt");
1361                 /* set/clear, then synch memory views with the device */
1362                 if (value) {
1363                         if (ep->num == 0)
1364                                 ep->dev->protocol_stall = 1;
1365                         else
1366                                 set_halt(ep);
1367                         if (wedged)
1368                                 ep->wedged = 1;
1369                 } else {
1370                         clear_halt(ep);
1371                         if (ep->dev->quirks & PLX_PCIE &&
1372                                 !list_empty(&ep->queue) && ep->td_dma)
1373                                         restart_dma(ep);
1374                         ep->wedged = 0;
1375                 }
1376                 (void) readl(&ep->regs->ep_rsp);
1377         }
1378         spin_unlock_irqrestore(&ep->dev->lock, flags);
1379
1380         return retval;
1381
1382 print_unlock:
1383         spin_unlock_irqrestore(&ep->dev->lock, flags);
1384 print_err:
1385         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1386         return retval;
1387 }
1388
1389 static int net2280_set_halt(struct usb_ep *_ep, int value)
1390 {
1391         return net2280_set_halt_and_wedge(_ep, value, 0);
1392 }
1393
1394 static int net2280_set_wedge(struct usb_ep *_ep)
1395 {
1396         if (!_ep || _ep->name == ep0name) {
1397                 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1398                 return -EINVAL;
1399         }
1400         return net2280_set_halt_and_wedge(_ep, 1, 1);
1401 }
1402
1403 static int net2280_fifo_status(struct usb_ep *_ep)
1404 {
1405         struct net2280_ep       *ep;
1406         u32                     avail;
1407
1408         ep = container_of(_ep, struct net2280_ep, ep);
1409         if (!_ep || (!ep->desc && ep->num != 0)) {
1410                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1411                 return -ENODEV;
1412         }
1413         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1414                 dev_err(&ep->dev->pdev->dev,
1415                         "%s: Invalid driver=%p or speed=%d\n",
1416                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1417                 return -ESHUTDOWN;
1418         }
1419
1420         avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1421         if (avail > ep->fifo_size) {
1422                 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1423                 return -EOVERFLOW;
1424         }
1425         if (ep->is_in)
1426                 avail = ep->fifo_size - avail;
1427         return avail;
1428 }
1429
1430 static void net2280_fifo_flush(struct usb_ep *_ep)
1431 {
1432         struct net2280_ep       *ep;
1433
1434         ep = container_of(_ep, struct net2280_ep, ep);
1435         if (!_ep || (!ep->desc && ep->num != 0)) {
1436                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1437                 return;
1438         }
1439         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1440                 dev_err(&ep->dev->pdev->dev,
1441                         "%s: Invalid driver=%p or speed=%d\n",
1442                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1443                 return;
1444         }
1445
1446         writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1447         (void) readl(&ep->regs->ep_rsp);
1448 }
1449
1450 static const struct usb_ep_ops net2280_ep_ops = {
1451         .enable         = net2280_enable,
1452         .disable        = net2280_disable,
1453
1454         .alloc_request  = net2280_alloc_request,
1455         .free_request   = net2280_free_request,
1456
1457         .queue          = net2280_queue,
1458         .dequeue        = net2280_dequeue,
1459
1460         .set_halt       = net2280_set_halt,
1461         .set_wedge      = net2280_set_wedge,
1462         .fifo_status    = net2280_fifo_status,
1463         .fifo_flush     = net2280_fifo_flush,
1464 };
1465
1466 /*-------------------------------------------------------------------------*/
1467
1468 static int net2280_get_frame(struct usb_gadget *_gadget)
1469 {
1470         struct net2280          *dev;
1471         unsigned long           flags;
1472         u16                     retval;
1473
1474         if (!_gadget)
1475                 return -ENODEV;
1476         dev = container_of(_gadget, struct net2280, gadget);
1477         spin_lock_irqsave(&dev->lock, flags);
1478         retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1479         spin_unlock_irqrestore(&dev->lock, flags);
1480         return retval;
1481 }
1482
1483 static int net2280_wakeup(struct usb_gadget *_gadget)
1484 {
1485         struct net2280          *dev;
1486         u32                     tmp;
1487         unsigned long           flags;
1488
1489         if (!_gadget)
1490                 return 0;
1491         dev = container_of(_gadget, struct net2280, gadget);
1492
1493         spin_lock_irqsave(&dev->lock, flags);
1494         tmp = readl(&dev->usb->usbctl);
1495         if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1496                 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1497         spin_unlock_irqrestore(&dev->lock, flags);
1498
1499         /* pci writes may still be posted */
1500         return 0;
1501 }
1502
1503 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1504 {
1505         struct net2280          *dev;
1506         u32                     tmp;
1507         unsigned long           flags;
1508
1509         if (!_gadget)
1510                 return 0;
1511         dev = container_of(_gadget, struct net2280, gadget);
1512
1513         spin_lock_irqsave(&dev->lock, flags);
1514         tmp = readl(&dev->usb->usbctl);
1515         if (value) {
1516                 tmp |= BIT(SELF_POWERED_STATUS);
1517                 _gadget->is_selfpowered = 1;
1518         } else {
1519                 tmp &= ~BIT(SELF_POWERED_STATUS);
1520                 _gadget->is_selfpowered = 0;
1521         }
1522         writel(tmp, &dev->usb->usbctl);
1523         spin_unlock_irqrestore(&dev->lock, flags);
1524
1525         return 0;
1526 }
1527
1528 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1529 {
1530         struct net2280  *dev;
1531         u32             tmp;
1532         unsigned long   flags;
1533
1534         if (!_gadget)
1535                 return -ENODEV;
1536         dev = container_of(_gadget, struct net2280, gadget);
1537
1538         spin_lock_irqsave(&dev->lock, flags);
1539         tmp = readl(&dev->usb->usbctl);
1540         dev->softconnect = (is_on != 0);
1541         if (is_on) {
1542                 ep0_start(dev);
1543                 writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1544         } else {
1545                 writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1546                 stop_activity(dev, NULL);
1547         }
1548
1549         spin_unlock_irqrestore(&dev->lock, flags);
1550
1551         if (!is_on && dev->driver)
1552                 dev->driver->disconnect(&dev->gadget);
1553
1554         return 0;
1555 }
1556
1557 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1558                 struct usb_endpoint_descriptor *desc,
1559                 struct usb_ss_ep_comp_descriptor *ep_comp)
1560 {
1561         char name[8];
1562         struct usb_ep *ep;
1563
1564         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1565                 /* ep-e, ep-f are PIO with only 64 byte fifos */
1566                 ep = gadget_find_ep_by_name(_gadget, "ep-e");
1567                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1568                         return ep;
1569                 ep = gadget_find_ep_by_name(_gadget, "ep-f");
1570                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1571                         return ep;
1572         }
1573
1574         /* USB3380: Only first four endpoints have DMA channels. Allocate
1575          * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc
1576          * endpoints use DMA hw endpoints.
1577          */
1578         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1579             usb_endpoint_dir_in(desc)) {
1580                 ep = gadget_find_ep_by_name(_gadget, "ep2in");
1581                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1582                         return ep;
1583                 ep = gadget_find_ep_by_name(_gadget, "ep4in");
1584                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1585                         return ep;
1586         } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1587                    !usb_endpoint_dir_in(desc)) {
1588                 ep = gadget_find_ep_by_name(_gadget, "ep1out");
1589                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1590                         return ep;
1591                 ep = gadget_find_ep_by_name(_gadget, "ep3out");
1592                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1593                         return ep;
1594         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1595                    usb_endpoint_dir_in(desc)) {
1596                 ep = gadget_find_ep_by_name(_gadget, "ep1in");
1597                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1598                         return ep;
1599                 ep = gadget_find_ep_by_name(_gadget, "ep3in");
1600                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1601                         return ep;
1602         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1603                    !usb_endpoint_dir_in(desc)) {
1604                 ep = gadget_find_ep_by_name(_gadget, "ep2out");
1605                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1606                         return ep;
1607                 ep = gadget_find_ep_by_name(_gadget, "ep4out");
1608                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1609                         return ep;
1610         }
1611
1612         /* USB3380: use same address for usb and hardware endpoints */
1613         snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1614                         usb_endpoint_dir_in(desc) ? "in" : "out");
1615         ep = gadget_find_ep_by_name(_gadget, name);
1616         if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1617                 return ep;
1618
1619         return NULL;
1620 }
1621
1622 static int net2280_start(struct usb_gadget *_gadget,
1623                 struct usb_gadget_driver *driver);
1624 static int net2280_stop(struct usb_gadget *_gadget);
1625
1626 static const struct usb_gadget_ops net2280_ops = {
1627         .get_frame      = net2280_get_frame,
1628         .wakeup         = net2280_wakeup,
1629         .set_selfpowered = net2280_set_selfpowered,
1630         .pullup         = net2280_pullup,
1631         .udc_start      = net2280_start,
1632         .udc_stop       = net2280_stop,
1633         .match_ep       = net2280_match_ep,
1634 };
1635
1636 /*-------------------------------------------------------------------------*/
1637
1638 #ifdef  CONFIG_USB_GADGET_DEBUG_FILES
1639
1640 /* FIXME move these into procfs, and use seq_file.
1641  * Sysfs _still_ doesn't behave for arbitrarily sized files,
1642  * and also doesn't help products using this with 2.4 kernels.
1643  */
1644
1645 /* "function" sysfs attribute */
1646 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1647                              char *buf)
1648 {
1649         struct net2280  *dev = dev_get_drvdata(_dev);
1650
1651         if (!dev->driver || !dev->driver->function ||
1652                         strlen(dev->driver->function) > PAGE_SIZE)
1653                 return 0;
1654         return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1655 }
1656 static DEVICE_ATTR_RO(function);
1657
1658 static ssize_t registers_show(struct device *_dev,
1659                               struct device_attribute *attr, char *buf)
1660 {
1661         struct net2280          *dev;
1662         char                    *next;
1663         unsigned                size, t;
1664         unsigned long           flags;
1665         int                     i;
1666         u32                     t1, t2;
1667         const char              *s;
1668
1669         dev = dev_get_drvdata(_dev);
1670         next = buf;
1671         size = PAGE_SIZE;
1672         spin_lock_irqsave(&dev->lock, flags);
1673
1674         if (dev->driver)
1675                 s = dev->driver->driver.name;
1676         else
1677                 s = "(none)";
1678
1679         /* Main Control Registers */
1680         t = scnprintf(next, size, "%s version " DRIVER_VERSION
1681                         ", chiprev %04x\n\n"
1682                         "devinit %03x fifoctl %08x gadget '%s'\n"
1683                         "pci irqenb0 %02x irqenb1 %08x "
1684                         "irqstat0 %04x irqstat1 %08x\n",
1685                         driver_name, dev->chiprev,
1686                         readl(&dev->regs->devinit),
1687                         readl(&dev->regs->fifoctl),
1688                         s,
1689                         readl(&dev->regs->pciirqenb0),
1690                         readl(&dev->regs->pciirqenb1),
1691                         readl(&dev->regs->irqstat0),
1692                         readl(&dev->regs->irqstat1));
1693         size -= t;
1694         next += t;
1695
1696         /* USB Control Registers */
1697         t1 = readl(&dev->usb->usbctl);
1698         t2 = readl(&dev->usb->usbstat);
1699         if (t1 & BIT(VBUS_PIN)) {
1700                 if (t2 & BIT(HIGH_SPEED))
1701                         s = "high speed";
1702                 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1703                         s = "powered";
1704                 else
1705                         s = "full speed";
1706                 /* full speed bit (6) not working?? */
1707         } else
1708                         s = "not attached";
1709         t = scnprintf(next, size,
1710                         "stdrsp %08x usbctl %08x usbstat %08x "
1711                                 "addr 0x%02x (%s)\n",
1712                         readl(&dev->usb->stdrsp), t1, t2,
1713                         readl(&dev->usb->ouraddr), s);
1714         size -= t;
1715         next += t;
1716
1717         /* PCI Master Control Registers */
1718
1719         /* DMA Control Registers */
1720
1721         /* Configurable EP Control Registers */
1722         for (i = 0; i < dev->n_ep; i++) {
1723                 struct net2280_ep       *ep;
1724
1725                 ep = &dev->ep[i];
1726                 if (i && !ep->desc)
1727                         continue;
1728
1729                 t1 = readl(&ep->cfg->ep_cfg);
1730                 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1731                 t = scnprintf(next, size,
1732                                 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1733                                         "irqenb %02x\n",
1734                                 ep->ep.name, t1, t2,
1735                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1736                                         ? "NAK " : "",
1737                                 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1738                                         ? "hide " : "",
1739                                 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1740                                         ? "CRC " : "",
1741                                 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1742                                         ? "interrupt " : "",
1743                                 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1744                                         ? "status " : "",
1745                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1746                                         ? "NAKmode " : "",
1747                                 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1748                                         ? "DATA1 " : "DATA0 ",
1749                                 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1750                                         ? "HALT " : "",
1751                                 readl(&ep->regs->ep_irqenb));
1752                 size -= t;
1753                 next += t;
1754
1755                 t = scnprintf(next, size,
1756                                 "\tstat %08x avail %04x "
1757                                 "(ep%d%s-%s)%s\n",
1758                                 readl(&ep->regs->ep_stat),
1759                                 readl(&ep->regs->ep_avail),
1760                                 t1 & 0x0f, DIR_STRING(t1),
1761                                 type_string(t1 >> 8),
1762                                 ep->stopped ? "*" : "");
1763                 size -= t;
1764                 next += t;
1765
1766                 if (!ep->dma)
1767                         continue;
1768
1769                 t = scnprintf(next, size,
1770                                 "  dma\tctl %08x stat %08x count %08x\n"
1771                                 "\taddr %08x desc %08x\n",
1772                                 readl(&ep->dma->dmactl),
1773                                 readl(&ep->dma->dmastat),
1774                                 readl(&ep->dma->dmacount),
1775                                 readl(&ep->dma->dmaaddr),
1776                                 readl(&ep->dma->dmadesc));
1777                 size -= t;
1778                 next += t;
1779
1780         }
1781
1782         /* Indexed Registers (none yet) */
1783
1784         /* Statistics */
1785         t = scnprintf(next, size, "\nirqs:  ");
1786         size -= t;
1787         next += t;
1788         for (i = 0; i < dev->n_ep; i++) {
1789                 struct net2280_ep       *ep;
1790
1791                 ep = &dev->ep[i];
1792                 if (i && !ep->irqs)
1793                         continue;
1794                 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1795                 size -= t;
1796                 next += t;
1797
1798         }
1799         t = scnprintf(next, size, "\n");
1800         size -= t;
1801         next += t;
1802
1803         spin_unlock_irqrestore(&dev->lock, flags);
1804
1805         return PAGE_SIZE - size;
1806 }
1807 static DEVICE_ATTR_RO(registers);
1808
1809 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1810                            char *buf)
1811 {
1812         struct net2280          *dev;
1813         char                    *next;
1814         unsigned                size;
1815         unsigned long           flags;
1816         int                     i;
1817
1818         dev = dev_get_drvdata(_dev);
1819         next = buf;
1820         size = PAGE_SIZE;
1821         spin_lock_irqsave(&dev->lock, flags);
1822
1823         for (i = 0; i < dev->n_ep; i++) {
1824                 struct net2280_ep               *ep = &dev->ep[i];
1825                 struct net2280_request          *req;
1826                 int                             t;
1827
1828                 if (i != 0) {
1829                         const struct usb_endpoint_descriptor    *d;
1830
1831                         d = ep->desc;
1832                         if (!d)
1833                                 continue;
1834                         t = d->bEndpointAddress;
1835                         t = scnprintf(next, size,
1836                                 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1837                                 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1838                                 (t & USB_DIR_IN) ? "in" : "out",
1839                                 type_string(d->bmAttributes),
1840                                 usb_endpoint_maxp(d),
1841                                 ep->dma ? "dma" : "pio", ep->fifo_size
1842                                 );
1843                 } else /* ep0 should only have one transfer queued */
1844                         t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1845                                         ep->is_in ? "in" : "out");
1846                 if (t <= 0 || t > size)
1847                         goto done;
1848                 size -= t;
1849                 next += t;
1850
1851                 if (list_empty(&ep->queue)) {
1852                         t = scnprintf(next, size, "\t(nothing queued)\n");
1853                         if (t <= 0 || t > size)
1854                                 goto done;
1855                         size -= t;
1856                         next += t;
1857                         continue;
1858                 }
1859                 list_for_each_entry(req, &ep->queue, queue) {
1860                         if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1861                                 t = scnprintf(next, size,
1862                                         "\treq %p len %d/%d "
1863                                         "buf %p (dmacount %08x)\n",
1864                                         &req->req, req->req.actual,
1865                                         req->req.length, req->req.buf,
1866                                         readl(&ep->dma->dmacount));
1867                         else
1868                                 t = scnprintf(next, size,
1869                                         "\treq %p len %d/%d buf %p\n",
1870                                         &req->req, req->req.actual,
1871                                         req->req.length, req->req.buf);
1872                         if (t <= 0 || t > size)
1873                                 goto done;
1874                         size -= t;
1875                         next += t;
1876
1877                         if (ep->dma) {
1878                                 struct net2280_dma      *td;
1879
1880                                 td = req->td;
1881                                 t = scnprintf(next, size, "\t    td %08x "
1882                                         " count %08x buf %08x desc %08x\n",
1883                                         (u32) req->td_dma,
1884                                         le32_to_cpu(td->dmacount),
1885                                         le32_to_cpu(td->dmaaddr),
1886                                         le32_to_cpu(td->dmadesc));
1887                                 if (t <= 0 || t > size)
1888                                         goto done;
1889                                 size -= t;
1890                                 next += t;
1891                         }
1892                 }
1893         }
1894
1895 done:
1896         spin_unlock_irqrestore(&dev->lock, flags);
1897         return PAGE_SIZE - size;
1898 }
1899 static DEVICE_ATTR_RO(queues);
1900
1901
1902 #else
1903
1904 #define device_create_file(a, b)        (0)
1905 #define device_remove_file(a, b)        do { } while (0)
1906
1907 #endif
1908
1909 /*-------------------------------------------------------------------------*/
1910
1911 /* another driver-specific mode might be a request type doing dma
1912  * to/from another device fifo instead of to/from memory.
1913  */
1914
1915 static void set_fifo_mode(struct net2280 *dev, int mode)
1916 {
1917         /* keeping high bits preserves BAR2 */
1918         writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1919
1920         /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1921         INIT_LIST_HEAD(&dev->gadget.ep_list);
1922         list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1923         list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1924         switch (mode) {
1925         case 0:
1926                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1927                 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1928                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1929                 break;
1930         case 1:
1931                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1932                 break;
1933         case 2:
1934                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1935                 dev->ep[1].fifo_size = 2048;
1936                 dev->ep[2].fifo_size = 1024;
1937                 break;
1938         }
1939         /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1940         list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1941         list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1942 }
1943
1944 static void defect7374_disable_data_eps(struct net2280 *dev)
1945 {
1946         /*
1947          * For Defect 7374, disable data EPs (and more):
1948          *  - This phase undoes the earlier phase of the Defect 7374 workaround,
1949          *    returing ep regs back to normal.
1950          */
1951         struct net2280_ep *ep;
1952         int i;
1953         unsigned char ep_sel;
1954         u32 tmp_reg;
1955
1956         for (i = 1; i < 5; i++) {
1957                 ep = &dev->ep[i];
1958                 writel(i, &ep->cfg->ep_cfg);
1959         }
1960
1961         /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1962         for (i = 0; i < 6; i++)
1963                 writel(0, &dev->dep[i].dep_cfg);
1964
1965         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1966                 /* Select an endpoint for subsequent operations: */
1967                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1968                 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1969
1970                 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1971                                         ep_sel == 18 || ep_sel == 20)
1972                         continue;
1973
1974                 /* Change settings on some selected endpoints */
1975                 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1976                 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1977                 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1978                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1979                 tmp_reg |= BIT(EP_INITIALIZED);
1980                 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1981         }
1982 }
1983
1984 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1985 {
1986         u32 tmp = 0, tmp_reg;
1987         u32 scratch;
1988         int i;
1989         unsigned char ep_sel;
1990
1991         scratch = get_idx_reg(dev->regs, SCRATCH);
1992
1993         WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1994                 == DEFECT7374_FSM_SS_CONTROL_READ);
1995
1996         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
1997
1998         ep_warn(dev, "Operate Defect 7374 workaround soft this time");
1999         ep_warn(dev, "It will operate on cold-reboot and SS connect");
2000
2001         /*GPEPs:*/
2002         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
2003                         (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
2004                         ((dev->enhanced_mode) ?
2005                          BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
2006                          BIT(ENDPOINT_ENABLE)));
2007
2008         for (i = 1; i < 5; i++)
2009                 writel(tmp, &dev->ep[i].cfg->ep_cfg);
2010
2011         /* CSRIN, PCIIN, STATIN, RCIN*/
2012         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
2013         writel(tmp, &dev->dep[1].dep_cfg);
2014         writel(tmp, &dev->dep[3].dep_cfg);
2015         writel(tmp, &dev->dep[4].dep_cfg);
2016         writel(tmp, &dev->dep[5].dep_cfg);
2017
2018         /*Implemented for development and debug.
2019          * Can be refined/tuned later.*/
2020         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
2021                 /* Select an endpoint for subsequent operations: */
2022                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
2023                 writel(((tmp_reg & ~0x1f) | ep_sel),
2024                                 &dev->plregs->pl_ep_ctrl);
2025
2026                 if (ep_sel == 1) {
2027                         tmp =
2028                                 (readl(&dev->plregs->pl_ep_ctrl) |
2029                                  BIT(CLEAR_ACK_ERROR_CODE) | 0);
2030                         writel(tmp, &dev->plregs->pl_ep_ctrl);
2031                         continue;
2032                 }
2033
2034                 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
2035                                 ep_sel == 18  || ep_sel == 20)
2036                         continue;
2037
2038                 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
2039                                 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
2040                 writel(tmp, &dev->plregs->pl_ep_cfg_4);
2041
2042                 tmp = readl(&dev->plregs->pl_ep_ctrl) &
2043                         ~BIT(EP_INITIALIZED);
2044                 writel(tmp, &dev->plregs->pl_ep_ctrl);
2045
2046         }
2047
2048         /* Set FSM to focus on the first Control Read:
2049          * - Tip: Connection speed is known upon the first
2050          * setup request.*/
2051         scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2052         set_idx_reg(dev->regs, SCRATCH, scratch);
2053
2054 }
2055
2056 /* keeping it simple:
2057  * - one bus driver, initted first;
2058  * - one function driver, initted second
2059  *
2060  * most of the work to support multiple net2280 controllers would
2061  * be to associate this gadget driver (yes?) with all of them, or
2062  * perhaps to bind specific drivers to specific devices.
2063  */
2064
2065 static void usb_reset_228x(struct net2280 *dev)
2066 {
2067         u32     tmp;
2068
2069         dev->gadget.speed = USB_SPEED_UNKNOWN;
2070         (void) readl(&dev->usb->usbctl);
2071
2072         net2280_led_init(dev);
2073
2074         /* disable automatic responses, and irqs */
2075         writel(0, &dev->usb->stdrsp);
2076         writel(0, &dev->regs->pciirqenb0);
2077         writel(0, &dev->regs->pciirqenb1);
2078
2079         /* clear old dma and irq state */
2080         for (tmp = 0; tmp < 4; tmp++) {
2081                 struct net2280_ep       *ep = &dev->ep[tmp + 1];
2082                 if (ep->dma)
2083                         abort_dma(ep);
2084         }
2085
2086         writel(~0, &dev->regs->irqstat0),
2087         writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2088
2089         /* reset, and enable pci */
2090         tmp = readl(&dev->regs->devinit) |
2091                 BIT(PCI_ENABLE) |
2092                 BIT(FIFO_SOFT_RESET) |
2093                 BIT(USB_SOFT_RESET) |
2094                 BIT(M8051_RESET);
2095         writel(tmp, &dev->regs->devinit);
2096
2097         /* standard fifo and endpoint allocations */
2098         set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2099 }
2100
2101 static void usb_reset_338x(struct net2280 *dev)
2102 {
2103         u32 tmp;
2104
2105         dev->gadget.speed = USB_SPEED_UNKNOWN;
2106         (void)readl(&dev->usb->usbctl);
2107
2108         net2280_led_init(dev);
2109
2110         if (dev->bug7734_patched) {
2111                 /* disable automatic responses, and irqs */
2112                 writel(0, &dev->usb->stdrsp);
2113                 writel(0, &dev->regs->pciirqenb0);
2114                 writel(0, &dev->regs->pciirqenb1);
2115         }
2116
2117         /* clear old dma and irq state */
2118         for (tmp = 0; tmp < 4; tmp++) {
2119                 struct net2280_ep *ep = &dev->ep[tmp + 1];
2120                 struct net2280_dma_regs __iomem *dma;
2121
2122                 if (ep->dma) {
2123                         abort_dma(ep);
2124                 } else {
2125                         dma = &dev->dma[tmp];
2126                         writel(BIT(DMA_ABORT), &dma->dmastat);
2127                         writel(0, &dma->dmactl);
2128                 }
2129         }
2130
2131         writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2132
2133         if (dev->bug7734_patched) {
2134                 /* reset, and enable pci */
2135                 tmp = readl(&dev->regs->devinit) |
2136                     BIT(PCI_ENABLE) |
2137                     BIT(FIFO_SOFT_RESET) |
2138                     BIT(USB_SOFT_RESET) |
2139                     BIT(M8051_RESET);
2140
2141                 writel(tmp, &dev->regs->devinit);
2142         }
2143
2144         /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2145         INIT_LIST_HEAD(&dev->gadget.ep_list);
2146
2147         for (tmp = 1; tmp < dev->n_ep; tmp++)
2148                 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2149
2150 }
2151
2152 static void usb_reset(struct net2280 *dev)
2153 {
2154         if (dev->quirks & PLX_LEGACY)
2155                 return usb_reset_228x(dev);
2156         return usb_reset_338x(dev);
2157 }
2158
2159 static void usb_reinit_228x(struct net2280 *dev)
2160 {
2161         u32     tmp;
2162
2163         /* basic endpoint init */
2164         for (tmp = 0; tmp < 7; tmp++) {
2165                 struct net2280_ep       *ep = &dev->ep[tmp];
2166
2167                 ep->ep.name = ep_info_dft[tmp].name;
2168                 ep->ep.caps = ep_info_dft[tmp].caps;
2169                 ep->dev = dev;
2170                 ep->num = tmp;
2171
2172                 if (tmp > 0 && tmp <= 4) {
2173                         ep->fifo_size = 1024;
2174                         ep->dma = &dev->dma[tmp - 1];
2175                 } else
2176                         ep->fifo_size = 64;
2177                 ep->regs = &dev->epregs[tmp];
2178                 ep->cfg = &dev->epregs[tmp];
2179                 ep_reset_228x(dev->regs, ep);
2180         }
2181         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2182         usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2183         usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2184
2185         dev->gadget.ep0 = &dev->ep[0].ep;
2186         dev->ep[0].stopped = 0;
2187         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2188
2189         /* we want to prevent lowlevel/insecure access from the USB host,
2190          * but erratum 0119 means this enable bit is ignored
2191          */
2192         for (tmp = 0; tmp < 5; tmp++)
2193                 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2194 }
2195
2196 static void usb_reinit_338x(struct net2280 *dev)
2197 {
2198         int i;
2199         u32 tmp, val;
2200         static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2201         static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2202                                                 0x00, 0xC0, 0x00, 0xC0 };
2203
2204         /* basic endpoint init */
2205         for (i = 0; i < dev->n_ep; i++) {
2206                 struct net2280_ep *ep = &dev->ep[i];
2207
2208                 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2209                                                    ep_info_dft[i].name;
2210                 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2211                                                    ep_info_dft[i].caps;
2212                 ep->dev = dev;
2213                 ep->num = i;
2214
2215                 if (i > 0 && i <= 4)
2216                         ep->dma = &dev->dma[i - 1];
2217
2218                 if (dev->enhanced_mode) {
2219                         ep->cfg = &dev->epregs[ne[i]];
2220                         /*
2221                          * Set USB endpoint number, hardware allows same number
2222                          * in both directions.
2223                          */
2224                          if (i > 0 && i < 5)
2225                                 writel(ne[i], &ep->cfg->ep_cfg);
2226                         ep->regs = (struct net2280_ep_regs __iomem *)
2227                                 (((void __iomem *)&dev->epregs[ne[i]]) +
2228                                 ep_reg_addr[i]);
2229                 } else {
2230                         ep->cfg = &dev->epregs[i];
2231                         ep->regs = &dev->epregs[i];
2232                 }
2233
2234                 ep->fifo_size = (i != 0) ? 2048 : 512;
2235
2236                 ep_reset_338x(dev->regs, ep);
2237         }
2238         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2239
2240         dev->gadget.ep0 = &dev->ep[0].ep;
2241         dev->ep[0].stopped = 0;
2242
2243         /* Link layer set up */
2244         if (dev->bug7734_patched) {
2245                 tmp = readl(&dev->usb_ext->usbctl2) &
2246                     ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2247                 writel(tmp, &dev->usb_ext->usbctl2);
2248         }
2249
2250         /* Hardware Defect and Workaround */
2251         val = readl(&dev->ll_lfps_regs->ll_lfps_5);
2252         val &= ~(0xf << TIMER_LFPS_6US);
2253         val |= 0x5 << TIMER_LFPS_6US;
2254         writel(val, &dev->ll_lfps_regs->ll_lfps_5);
2255
2256         val = readl(&dev->ll_lfps_regs->ll_lfps_6);
2257         val &= ~(0xffff << TIMER_LFPS_80US);
2258         val |= 0x0100 << TIMER_LFPS_80US;
2259         writel(val, &dev->ll_lfps_regs->ll_lfps_6);
2260
2261         /*
2262          * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2263          * Hot Reset Exit Handshake may Fail in Specific Case using
2264          * Default Register Settings. Workaround for Enumeration test.
2265          */
2266         val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
2267         val &= ~(0x1f << HOT_TX_NORESET_TS2);
2268         val |= 0x10 << HOT_TX_NORESET_TS2;
2269         writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
2270
2271         val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
2272         val &= ~(0x1f << HOT_RX_RESET_TS2);
2273         val |= 0x3 << HOT_RX_RESET_TS2;
2274         writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
2275
2276         /*
2277          * Set Recovery Idle to Recover bit:
2278          * - On SS connections, setting Recovery Idle to Recover Fmw improves
2279          *   link robustness with various hosts and hubs.
2280          * - It is safe to set for all connection speeds; all chip revisions.
2281          * - R-M-W to leave other bits undisturbed.
2282          * - Reference PLX TT-7372
2283         */
2284         val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
2285         val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2286         writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
2287
2288         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2289
2290         /* disable dedicated endpoints */
2291         writel(0x0D, &dev->dep[0].dep_cfg);
2292         writel(0x0D, &dev->dep[1].dep_cfg);
2293         writel(0x0E, &dev->dep[2].dep_cfg);
2294         writel(0x0E, &dev->dep[3].dep_cfg);
2295         writel(0x0F, &dev->dep[4].dep_cfg);
2296         writel(0x0C, &dev->dep[5].dep_cfg);
2297 }
2298
2299 static void usb_reinit(struct net2280 *dev)
2300 {
2301         if (dev->quirks & PLX_LEGACY)
2302                 return usb_reinit_228x(dev);
2303         return usb_reinit_338x(dev);
2304 }
2305
2306 static void ep0_start_228x(struct net2280 *dev)
2307 {
2308         writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2309                 BIT(CLEAR_NAK_OUT_PACKETS) |
2310                 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2311                 &dev->epregs[0].ep_rsp);
2312
2313         /*
2314          * hardware optionally handles a bunch of standard requests
2315          * that the API hides from drivers anyway.  have it do so.
2316          * endpoint status/features are handled in software, to
2317          * help pass tests for some dubious behavior.
2318          */
2319         writel(BIT(SET_TEST_MODE) |
2320                 BIT(SET_ADDRESS) |
2321                 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2322                 BIT(GET_DEVICE_STATUS) |
2323                 BIT(GET_INTERFACE_STATUS),
2324                 &dev->usb->stdrsp);
2325         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2326                 BIT(SELF_POWERED_USB_DEVICE) |
2327                 BIT(REMOTE_WAKEUP_SUPPORT) |
2328                 (dev->softconnect << USB_DETECT_ENABLE) |
2329                 BIT(SELF_POWERED_STATUS),
2330                 &dev->usb->usbctl);
2331
2332         /* enable irqs so we can see ep0 and general operation  */
2333         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2334                 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2335                 &dev->regs->pciirqenb0);
2336         writel(BIT(PCI_INTERRUPT_ENABLE) |
2337                 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2338                 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2339                 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2340                 BIT(VBUS_INTERRUPT_ENABLE) |
2341                 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2342                 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2343                 &dev->regs->pciirqenb1);
2344
2345         /* don't leave any writes posted */
2346         (void) readl(&dev->usb->usbctl);
2347 }
2348
2349 static void ep0_start_338x(struct net2280 *dev)
2350 {
2351
2352         if (dev->bug7734_patched)
2353                 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2354                        BIT(SET_EP_HIDE_STATUS_PHASE),
2355                        &dev->epregs[0].ep_rsp);
2356
2357         /*
2358          * hardware optionally handles a bunch of standard requests
2359          * that the API hides from drivers anyway.  have it do so.
2360          * endpoint status/features are handled in software, to
2361          * help pass tests for some dubious behavior.
2362          */
2363         writel(BIT(SET_ISOCHRONOUS_DELAY) |
2364                BIT(SET_SEL) |
2365                BIT(SET_TEST_MODE) |
2366                BIT(SET_ADDRESS) |
2367                BIT(GET_INTERFACE_STATUS) |
2368                BIT(GET_DEVICE_STATUS),
2369                 &dev->usb->stdrsp);
2370         dev->wakeup_enable = 1;
2371         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2372                (dev->softconnect << USB_DETECT_ENABLE) |
2373                BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2374                &dev->usb->usbctl);
2375
2376         /* enable irqs so we can see ep0 and general operation  */
2377         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2378                BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2379                &dev->regs->pciirqenb0);
2380         writel(BIT(PCI_INTERRUPT_ENABLE) |
2381                BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2382                BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2383                BIT(VBUS_INTERRUPT_ENABLE),
2384                &dev->regs->pciirqenb1);
2385
2386         /* don't leave any writes posted */
2387         (void)readl(&dev->usb->usbctl);
2388 }
2389
2390 static void ep0_start(struct net2280 *dev)
2391 {
2392         if (dev->quirks & PLX_LEGACY)
2393                 return ep0_start_228x(dev);
2394         return ep0_start_338x(dev);
2395 }
2396
2397 /* when a driver is successfully registered, it will receive
2398  * control requests including set_configuration(), which enables
2399  * non-control requests.  then usb traffic follows until a
2400  * disconnect is reported.  then a host may connect again, or
2401  * the driver might get unbound.
2402  */
2403 static int net2280_start(struct usb_gadget *_gadget,
2404                 struct usb_gadget_driver *driver)
2405 {
2406         struct net2280          *dev;
2407         int                     retval;
2408         unsigned                i;
2409
2410         /* insist on high speed support from the driver, since
2411          * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2412          * "must not be used in normal operation"
2413          */
2414         if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2415                         !driver->setup)
2416                 return -EINVAL;
2417
2418         dev = container_of(_gadget, struct net2280, gadget);
2419
2420         for (i = 0; i < dev->n_ep; i++)
2421                 dev->ep[i].irqs = 0;
2422
2423         /* hook up the driver ... */
2424         driver->driver.bus = NULL;
2425         dev->driver = driver;
2426
2427         retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2428         if (retval)
2429                 goto err_unbind;
2430         retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2431         if (retval)
2432                 goto err_func;
2433
2434         /* enable host detection and ep0; and we're ready
2435          * for set_configuration as well as eventual disconnect.
2436          */
2437         net2280_led_active(dev, 1);
2438
2439         if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
2440                 defect7374_enable_data_eps_zero(dev);
2441
2442         ep0_start(dev);
2443
2444         /* pci writes may still be posted */
2445         return 0;
2446
2447 err_func:
2448         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2449 err_unbind:
2450         dev->driver = NULL;
2451         return retval;
2452 }
2453
2454 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2455 {
2456         int                     i;
2457
2458         /* don't disconnect if it's not connected */
2459         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2460                 driver = NULL;
2461
2462         /* stop hardware; prevent new request submissions;
2463          * and kill any outstanding requests.
2464          */
2465         usb_reset(dev);
2466         for (i = 0; i < dev->n_ep; i++)
2467                 nuke(&dev->ep[i]);
2468
2469         /* report disconnect; the driver is already quiesced */
2470         if (driver) {
2471                 spin_unlock(&dev->lock);
2472                 driver->disconnect(&dev->gadget);
2473                 spin_lock(&dev->lock);
2474         }
2475
2476         usb_reinit(dev);
2477 }
2478
2479 static int net2280_stop(struct usb_gadget *_gadget)
2480 {
2481         struct net2280  *dev;
2482         unsigned long   flags;
2483
2484         dev = container_of(_gadget, struct net2280, gadget);
2485
2486         spin_lock_irqsave(&dev->lock, flags);
2487         stop_activity(dev, NULL);
2488         spin_unlock_irqrestore(&dev->lock, flags);
2489
2490         net2280_led_active(dev, 0);
2491
2492         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2493         device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2494
2495         dev->driver = NULL;
2496
2497         return 0;
2498 }
2499
2500 /*-------------------------------------------------------------------------*/
2501
2502 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2503  * also works for dma-capable endpoints, in pio mode or just
2504  * to manually advance the queue after short OUT transfers.
2505  */
2506 static void handle_ep_small(struct net2280_ep *ep)
2507 {
2508         struct net2280_request  *req;
2509         u32                     t;
2510         /* 0 error, 1 mid-data, 2 done */
2511         int                     mode = 1;
2512
2513         if (!list_empty(&ep->queue))
2514                 req = list_entry(ep->queue.next,
2515                         struct net2280_request, queue);
2516         else
2517                 req = NULL;
2518
2519         /* ack all, and handle what we care about */
2520         t = readl(&ep->regs->ep_stat);
2521         ep->irqs++;
2522
2523         ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2524                         ep->ep.name, t, req ? &req->req : NULL);
2525
2526         if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2527                 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2528         else
2529                 /* Added for 2282 */
2530                 writel(t, &ep->regs->ep_stat);
2531
2532         /* for ep0, monitor token irqs to catch data stage length errors
2533          * and to synchronize on status.
2534          *
2535          * also, to defer reporting of protocol stalls ... here's where
2536          * data or status first appears, handling stalls here should never
2537          * cause trouble on the host side..
2538          *
2539          * control requests could be slightly faster without token synch for
2540          * status, but status can jam up that way.
2541          */
2542         if (unlikely(ep->num == 0)) {
2543                 if (ep->is_in) {
2544                         /* status; stop NAKing */
2545                         if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2546                                 if (ep->dev->protocol_stall) {
2547                                         ep->stopped = 1;
2548                                         set_halt(ep);
2549                                 }
2550                                 if (!req)
2551                                         allow_status(ep);
2552                                 mode = 2;
2553                         /* reply to extra IN data tokens with a zlp */
2554                         } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2555                                 if (ep->dev->protocol_stall) {
2556                                         ep->stopped = 1;
2557                                         set_halt(ep);
2558                                         mode = 2;
2559                                 } else if (ep->responded &&
2560                                                 !req && !ep->stopped)
2561                                         write_fifo(ep, NULL);
2562                         }
2563                 } else {
2564                         /* status; stop NAKing */
2565                         if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2566                                 if (ep->dev->protocol_stall) {
2567                                         ep->stopped = 1;
2568                                         set_halt(ep);
2569                                 }
2570                                 mode = 2;
2571                         /* an extra OUT token is an error */
2572                         } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2573                                         req &&
2574                                         req->req.actual == req->req.length) ||
2575                                         (ep->responded && !req)) {
2576                                 ep->dev->protocol_stall = 1;
2577                                 set_halt(ep);
2578                                 ep->stopped = 1;
2579                                 if (req)
2580                                         done(ep, req, -EOVERFLOW);
2581                                 req = NULL;
2582                         }
2583                 }
2584         }
2585
2586         if (unlikely(!req))
2587                 return;
2588
2589         /* manual DMA queue advance after short OUT */
2590         if (likely(ep->dma)) {
2591                 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2592                         struct net2280_request *stuck_req = NULL;
2593                         int     stopped = ep->stopped;
2594                         int     num_completed;
2595                         int     stuck = 0;
2596                         u32     count;
2597
2598                         /* TRANSFERRED works around OUT_DONE erratum 0112.
2599                          * we expect (N <= maxpacket) bytes; host wrote M.
2600                          * iff (M < N) we won't ever see a DMA interrupt.
2601                          */
2602                         ep->stopped = 1;
2603                         for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2604
2605                                 /* any preceding dma transfers must finish.
2606                                  * dma handles (M >= N), may empty the queue
2607                                  */
2608                                 num_completed = scan_dma_completions(ep);
2609                                 if (unlikely(list_empty(&ep->queue) ||
2610                                                 ep->out_overflow)) {
2611                                         req = NULL;
2612                                         break;
2613                                 }
2614                                 req = list_entry(ep->queue.next,
2615                                         struct net2280_request, queue);
2616
2617                                 /* here either (M < N), a "real" short rx;
2618                                  * or (M == N) and the queue didn't empty
2619                                  */
2620                                 if (likely(t & BIT(FIFO_EMPTY))) {
2621                                         count = readl(&ep->dma->dmacount);
2622                                         count &= DMA_BYTE_COUNT_MASK;
2623                                         if (readl(&ep->dma->dmadesc)
2624                                                         != req->td_dma)
2625                                                 req = NULL;
2626                                         break;
2627                                 }
2628
2629                                 /* Escape loop if no dma transfers completed
2630                                  * after few retries.
2631                                  */
2632                                 if (num_completed == 0) {
2633                                         if (stuck_req == req &&
2634                                             readl(&ep->dma->dmadesc) !=
2635                                                   req->td_dma && stuck++ > 5) {
2636                                                 count = readl(
2637                                                         &ep->dma->dmacount);
2638                                                 count &= DMA_BYTE_COUNT_MASK;
2639                                                 req = NULL;
2640                                                 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n",
2641                                                         ep->ep.name, stuck,
2642                                                         count);
2643                                                 break;
2644                                         } else if (stuck_req != req) {
2645                                                 stuck_req = req;
2646                                                 stuck = 0;
2647                                         }
2648                                 } else {
2649                                         stuck_req = NULL;
2650                                         stuck = 0;
2651                                 }
2652
2653                                 udelay(1);
2654                         }
2655
2656                         /* stop DMA, leave ep NAKing */
2657                         writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2658                         spin_stop_dma(ep->dma);
2659
2660                         if (likely(req)) {
2661                                 req->td->dmacount = 0;
2662                                 t = readl(&ep->regs->ep_avail);
2663                                 dma_done(ep, req, count,
2664                                         (ep->out_overflow || t)
2665                                                 ? -EOVERFLOW : 0);
2666                         }
2667
2668                         /* also flush to prevent erratum 0106 trouble */
2669                         if (unlikely(ep->out_overflow ||
2670                                         (ep->dev->chiprev == 0x0100 &&
2671                                         ep->dev->gadget.speed
2672                                         == USB_SPEED_FULL))) {
2673                                 out_flush(ep);
2674                                 ep->out_overflow = 0;
2675                         }
2676
2677                         /* (re)start dma if needed, stop NAKing */
2678                         ep->stopped = stopped;
2679                         if (!list_empty(&ep->queue))
2680                                 restart_dma(ep);
2681                 } else
2682                         ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2683                                         ep->ep.name, t);
2684                 return;
2685
2686         /* data packet(s) received (in the fifo, OUT) */
2687         } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2688                 if (read_fifo(ep, req) && ep->num != 0)
2689                         mode = 2;
2690
2691         /* data packet(s) transmitted (IN) */
2692         } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2693                 unsigned        len;
2694
2695                 len = req->req.length - req->req.actual;
2696                 if (len > ep->ep.maxpacket)
2697                         len = ep->ep.maxpacket;
2698                 req->req.actual += len;
2699
2700                 /* if we wrote it all, we're usually done */
2701                 /* send zlps until the status stage */
2702                 if ((req->req.actual == req->req.length) &&
2703                         (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2704                                 mode = 2;
2705
2706         /* there was nothing to do ...  */
2707         } else if (mode == 1)
2708                 return;
2709
2710         /* done */
2711         if (mode == 2) {
2712                 /* stream endpoints often resubmit/unlink in completion */
2713                 done(ep, req, 0);
2714
2715                 /* maybe advance queue to next request */
2716                 if (ep->num == 0) {
2717                         /* NOTE:  net2280 could let gadget driver start the
2718                          * status stage later. since not all controllers let
2719                          * them control that, the api doesn't (yet) allow it.
2720                          */
2721                         if (!ep->stopped)
2722                                 allow_status(ep);
2723                         req = NULL;
2724                 } else {
2725                         if (!list_empty(&ep->queue) && !ep->stopped)
2726                                 req = list_entry(ep->queue.next,
2727                                         struct net2280_request, queue);
2728                         else
2729                                 req = NULL;
2730                         if (req && !ep->is_in)
2731                                 stop_out_naking(ep);
2732                 }
2733         }
2734
2735         /* is there a buffer for the next packet?
2736          * for best streaming performance, make sure there is one.
2737          */
2738         if (req && !ep->stopped) {
2739
2740                 /* load IN fifo with next packet (may be zlp) */
2741                 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2742                         write_fifo(ep, &req->req);
2743         }
2744 }
2745
2746 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2747 {
2748         struct net2280_ep       *ep;
2749
2750         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2751                 return &dev->ep[0];
2752         list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2753                 u8      bEndpointAddress;
2754
2755                 if (!ep->desc)
2756                         continue;
2757                 bEndpointAddress = ep->desc->bEndpointAddress;
2758                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2759                         continue;
2760                 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2761                         return ep;
2762         }
2763         return NULL;
2764 }
2765
2766 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2767 {
2768         u32 scratch, fsmvalue;
2769         u32 ack_wait_timeout, state;
2770
2771         /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2772         scratch = get_idx_reg(dev->regs, SCRATCH);
2773         fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2774         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2775
2776         if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2777                                 (r.bRequestType & USB_DIR_IN)))
2778                 return;
2779
2780         /* This is the first Control Read for this connection: */
2781         if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2782                 /*
2783                  * Connection is NOT SS:
2784                  * - Connection must be FS or HS.
2785                  * - This FSM state should allow workaround software to
2786                  * run after the next USB connection.
2787                  */
2788                 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2789                 dev->bug7734_patched = 1;
2790                 goto restore_data_eps;
2791         }
2792
2793         /* Connection is SS: */
2794         for (ack_wait_timeout = 0;
2795                         ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2796                         ack_wait_timeout++) {
2797
2798                 state = readl(&dev->plregs->pl_ep_status_1)
2799                         & (0xff << STATE);
2800                 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2801                         (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2802                         scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2803                         dev->bug7734_patched = 1;
2804                         break;
2805                 }
2806
2807                 /*
2808                  * We have not yet received host's Data Phase ACK
2809                  * - Wait and try again.
2810                  */
2811                 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2812
2813                 continue;
2814         }
2815
2816
2817         if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2818                 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2819                 "to detect SS host's data phase ACK.");
2820                 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2821                 "got 0x%2.2x.\n", state >> STATE);
2822         } else {
2823                 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2824                 "%duSec for Control Read Data Phase ACK\n",
2825                         DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2826         }
2827
2828 restore_data_eps:
2829         /*
2830          * Restore data EPs to their pre-workaround settings (disabled,
2831          * initialized, and other details).
2832          */
2833         defect7374_disable_data_eps(dev);
2834
2835         set_idx_reg(dev->regs, SCRATCH, scratch);
2836
2837         return;
2838 }
2839
2840 static void ep_clear_seqnum(struct net2280_ep *ep)
2841 {
2842         struct net2280 *dev = ep->dev;
2843         u32 val;
2844         static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2845
2846         val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2847         val |= ep_pl[ep->num];
2848         writel(val, &dev->plregs->pl_ep_ctrl);
2849         val |= BIT(SEQUENCE_NUMBER_RESET);
2850         writel(val, &dev->plregs->pl_ep_ctrl);
2851
2852         return;
2853 }
2854
2855 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2856                 struct net2280_ep *ep, struct usb_ctrlrequest r)
2857 {
2858         int tmp = 0;
2859
2860 #define w_value         le16_to_cpu(r.wValue)
2861 #define w_index         le16_to_cpu(r.wIndex)
2862 #define w_length        le16_to_cpu(r.wLength)
2863
2864         switch (r.bRequest) {
2865                 struct net2280_ep *e;
2866                 u16 status;
2867
2868         case USB_REQ_SET_CONFIGURATION:
2869                 dev->addressed_state = !w_value;
2870                 goto usb3_delegate;
2871
2872         case USB_REQ_GET_STATUS:
2873                 switch (r.bRequestType) {
2874                 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2875                         status = dev->wakeup_enable ? 0x02 : 0x00;
2876                         if (dev->gadget.is_selfpowered)
2877                                 status |= BIT(0);
2878                         status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2879                                                         dev->ltm_enable << 4);
2880                         writel(0, &dev->epregs[0].ep_irqenb);
2881                         set_fifo_bytecount(ep, sizeof(status));
2882                         writel((__force u32) status, &dev->epregs[0].ep_data);
2883                         allow_status_338x(ep);
2884                         break;
2885
2886                 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2887                         e = get_ep_by_addr(dev, w_index);
2888                         if (!e)
2889                                 goto do_stall3;
2890                         status = readl(&e->regs->ep_rsp) &
2891                                                 BIT(CLEAR_ENDPOINT_HALT);
2892                         writel(0, &dev->epregs[0].ep_irqenb);
2893                         set_fifo_bytecount(ep, sizeof(status));
2894                         writel((__force u32) status, &dev->epregs[0].ep_data);
2895                         allow_status_338x(ep);
2896                         break;
2897
2898                 default:
2899                         goto usb3_delegate;
2900                 }
2901                 break;
2902
2903         case USB_REQ_CLEAR_FEATURE:
2904                 switch (r.bRequestType) {
2905                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2906                         if (!dev->addressed_state) {
2907                                 switch (w_value) {
2908                                 case USB_DEVICE_U1_ENABLE:
2909                                         dev->u1_enable = 0;
2910                                         writel(readl(&dev->usb_ext->usbctl2) &
2911                                                 ~BIT(U1_ENABLE),
2912                                                 &dev->usb_ext->usbctl2);
2913                                         allow_status_338x(ep);
2914                                         goto next_endpoints3;
2915
2916                                 case USB_DEVICE_U2_ENABLE:
2917                                         dev->u2_enable = 0;
2918                                         writel(readl(&dev->usb_ext->usbctl2) &
2919                                                 ~BIT(U2_ENABLE),
2920                                                 &dev->usb_ext->usbctl2);
2921                                         allow_status_338x(ep);
2922                                         goto next_endpoints3;
2923
2924                                 case USB_DEVICE_LTM_ENABLE:
2925                                         dev->ltm_enable = 0;
2926                                         writel(readl(&dev->usb_ext->usbctl2) &
2927                                                 ~BIT(LTM_ENABLE),
2928                                                 &dev->usb_ext->usbctl2);
2929                                         allow_status_338x(ep);
2930                                         goto next_endpoints3;
2931
2932                                 default:
2933                                         break;
2934                                 }
2935                         }
2936                         if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2937                                 dev->wakeup_enable = 0;
2938                                 writel(readl(&dev->usb->usbctl) &
2939                                         ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2940                                         &dev->usb->usbctl);
2941                                 allow_status_338x(ep);
2942                                 break;
2943                         }
2944                         goto usb3_delegate;
2945
2946                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2947                         e = get_ep_by_addr(dev, w_index);
2948                         if (!e)
2949                                 goto do_stall3;
2950                         if (w_value != USB_ENDPOINT_HALT)
2951                                 goto do_stall3;
2952                         ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2953                         /*
2954                          * Workaround for SS SeqNum not cleared via
2955                          * Endpoint Halt (Clear) bit. select endpoint
2956                          */
2957                         ep_clear_seqnum(e);
2958                         clear_halt(e);
2959                         if (!list_empty(&e->queue) && e->td_dma)
2960                                 restart_dma(e);
2961                         allow_status(ep);
2962                         ep->stopped = 1;
2963                         break;
2964
2965                 default:
2966                         goto usb3_delegate;
2967                 }
2968                 break;
2969         case USB_REQ_SET_FEATURE:
2970                 switch (r.bRequestType) {
2971                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2972                         if (!dev->addressed_state) {
2973                                 switch (w_value) {
2974                                 case USB_DEVICE_U1_ENABLE:
2975                                         dev->u1_enable = 1;
2976                                         writel(readl(&dev->usb_ext->usbctl2) |
2977                                                 BIT(U1_ENABLE),
2978                                                 &dev->usb_ext->usbctl2);
2979                                         allow_status_338x(ep);
2980                                         goto next_endpoints3;
2981
2982                                 case USB_DEVICE_U2_ENABLE:
2983                                         dev->u2_enable = 1;
2984                                         writel(readl(&dev->usb_ext->usbctl2) |
2985                                                 BIT(U2_ENABLE),
2986                                                 &dev->usb_ext->usbctl2);
2987                                         allow_status_338x(ep);
2988                                         goto next_endpoints3;
2989
2990                                 case USB_DEVICE_LTM_ENABLE:
2991                                         dev->ltm_enable = 1;
2992                                         writel(readl(&dev->usb_ext->usbctl2) |
2993                                                 BIT(LTM_ENABLE),
2994                                                 &dev->usb_ext->usbctl2);
2995                                         allow_status_338x(ep);
2996                                         goto next_endpoints3;
2997                                 default:
2998                                         break;
2999                                 }
3000                         }
3001
3002                         if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
3003                                 dev->wakeup_enable = 1;
3004                                 writel(readl(&dev->usb->usbctl) |
3005                                         BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
3006                                         &dev->usb->usbctl);
3007                                 allow_status_338x(ep);
3008                                 break;
3009                         }
3010                         goto usb3_delegate;
3011
3012                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
3013                         e = get_ep_by_addr(dev, w_index);
3014                         if (!e || (w_value != USB_ENDPOINT_HALT))
3015                                 goto do_stall3;
3016                         ep->stopped = 1;
3017                         if (ep->num == 0)
3018                                 ep->dev->protocol_stall = 1;
3019                         else {
3020                                 if (ep->dma)
3021                                         abort_dma(ep);
3022                                 set_halt(ep);
3023                         }
3024                         allow_status_338x(ep);
3025                         break;
3026
3027                 default:
3028                         goto usb3_delegate;
3029                 }
3030
3031                 break;
3032         default:
3033
3034 usb3_delegate:
3035                 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
3036                                 r.bRequestType, r.bRequest,
3037                                 w_value, w_index, w_length,
3038                                 readl(&ep->cfg->ep_cfg));
3039
3040                 ep->responded = 0;
3041                 spin_unlock(&dev->lock);
3042                 tmp = dev->driver->setup(&dev->gadget, &r);
3043                 spin_lock(&dev->lock);
3044         }
3045 do_stall3:
3046         if (tmp < 0) {
3047                 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3048                                 r.bRequestType, r.bRequest, tmp);
3049                 dev->protocol_stall = 1;
3050                 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
3051                 set_halt(ep);
3052         }
3053
3054 next_endpoints3:
3055
3056 #undef  w_value
3057 #undef  w_index
3058 #undef  w_length
3059
3060         return;
3061 }
3062
3063 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
3064 {
3065         u32 index;
3066         u32 bit;
3067
3068         for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
3069                 bit = BIT(ep_bit[index]);
3070
3071                 if (!stat0)
3072                         break;
3073
3074                 if (!(stat0 & bit))
3075                         continue;
3076
3077                 stat0 &= ~bit;
3078
3079                 handle_ep_small(&dev->ep[index]);
3080         }
3081 }
3082
3083 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
3084 {
3085         struct net2280_ep       *ep;
3086         u32                     num, scratch;
3087
3088         /* most of these don't need individual acks */
3089         stat &= ~BIT(INTA_ASSERTED);
3090         if (!stat)
3091                 return;
3092         /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
3093
3094         /* starting a control request? */
3095         if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
3096                 union {
3097                         u32                     raw[2];
3098                         struct usb_ctrlrequest  r;
3099                 } u;
3100                 int                             tmp;
3101                 struct net2280_request          *req;
3102
3103                 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
3104                         u32 val = readl(&dev->usb->usbstat);
3105                         if (val & BIT(SUPER_SPEED)) {
3106                                 dev->gadget.speed = USB_SPEED_SUPER;
3107                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3108                                                 EP0_SS_MAX_PACKET_SIZE);
3109                         } else if (val & BIT(HIGH_SPEED)) {
3110                                 dev->gadget.speed = USB_SPEED_HIGH;
3111                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3112                                                 EP0_HS_MAX_PACKET_SIZE);
3113                         } else {
3114                                 dev->gadget.speed = USB_SPEED_FULL;
3115                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3116                                                 EP0_HS_MAX_PACKET_SIZE);
3117                         }
3118                         net2280_led_speed(dev, dev->gadget.speed);
3119                         ep_dbg(dev, "%s\n",
3120                                         usb_speed_string(dev->gadget.speed));
3121                 }
3122
3123                 ep = &dev->ep[0];
3124                 ep->irqs++;
3125
3126                 /* make sure any leftover request state is cleared */
3127                 stat &= ~BIT(ENDPOINT_0_INTERRUPT);
3128                 while (!list_empty(&ep->queue)) {
3129                         req = list_entry(ep->queue.next,
3130                                         struct net2280_request, queue);
3131                         done(ep, req, (req->req.actual == req->req.length)
3132                                                 ? 0 : -EPROTO);
3133                 }
3134                 ep->stopped = 0;
3135                 dev->protocol_stall = 0;
3136                 if (!(dev->quirks & PLX_PCIE)) {
3137                         if (ep->dev->quirks & PLX_2280)
3138                                 tmp = BIT(FIFO_OVERFLOW) |
3139                                     BIT(FIFO_UNDERFLOW);
3140                         else
3141                                 tmp = 0;
3142
3143                         writel(tmp | BIT(TIMEOUT) |
3144                                    BIT(USB_STALL_SENT) |
3145                                    BIT(USB_IN_NAK_SENT) |
3146                                    BIT(USB_IN_ACK_RCVD) |
3147                                    BIT(USB_OUT_PING_NAK_SENT) |
3148                                    BIT(USB_OUT_ACK_SENT) |
3149                                    BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3150                                    BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3151                                    BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3152                                    BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3153                                    BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3154                                    BIT(DATA_IN_TOKEN_INTERRUPT),
3155                                    &ep->regs->ep_stat);
3156                 }
3157                 u.raw[0] = readl(&dev->usb->setup0123);
3158                 u.raw[1] = readl(&dev->usb->setup4567);
3159
3160                 cpu_to_le32s(&u.raw[0]);
3161                 cpu_to_le32s(&u.raw[1]);
3162
3163                 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
3164                         defect7374_workaround(dev, u.r);
3165
3166                 tmp = 0;
3167
3168 #define w_value         le16_to_cpu(u.r.wValue)
3169 #define w_index         le16_to_cpu(u.r.wIndex)
3170 #define w_length        le16_to_cpu(u.r.wLength)
3171
3172                 /* ack the irq */
3173                 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3174                 stat ^= BIT(SETUP_PACKET_INTERRUPT);
3175
3176                 /* watch control traffic at the token level, and force
3177                  * synchronization before letting the status stage happen.
3178                  * FIXME ignore tokens we'll NAK, until driver responds.
3179                  * that'll mean a lot less irqs for some drivers.
3180                  */
3181                 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3182                 if (ep->is_in) {
3183                         scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3184                                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3185                                 BIT(DATA_IN_TOKEN_INTERRUPT);
3186                         stop_out_naking(ep);
3187                 } else
3188                         scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3189                                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3190                                 BIT(DATA_IN_TOKEN_INTERRUPT);
3191                 writel(scratch, &dev->epregs[0].ep_irqenb);
3192
3193                 /* we made the hardware handle most lowlevel requests;
3194                  * everything else goes uplevel to the gadget code.
3195                  */
3196                 ep->responded = 1;
3197
3198                 if (dev->gadget.speed == USB_SPEED_SUPER) {
3199                         handle_stat0_irqs_superspeed(dev, ep, u.r);
3200                         goto next_endpoints;
3201                 }
3202
3203                 switch (u.r.bRequest) {
3204                 case USB_REQ_GET_STATUS: {
3205                         struct net2280_ep       *e;
3206                         __le32                  status;
3207
3208                         /* hw handles device and interface status */
3209                         if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3210                                 goto delegate;
3211                         e = get_ep_by_addr(dev, w_index);
3212                         if (!e || w_length > 2)
3213                                 goto do_stall;
3214
3215                         if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3216                                 status = cpu_to_le32(1);
3217                         else
3218                                 status = cpu_to_le32(0);
3219
3220                         /* don't bother with a request object! */
3221                         writel(0, &dev->epregs[0].ep_irqenb);
3222                         set_fifo_bytecount(ep, w_length);
3223                         writel((__force u32)status, &dev->epregs[0].ep_data);
3224                         allow_status(ep);
3225                         ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3226                         goto next_endpoints;
3227                         }
3228                         break;
3229                 case USB_REQ_CLEAR_FEATURE: {
3230                         struct net2280_ep       *e;
3231
3232                         /* hw handles device features */
3233                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3234                                 goto delegate;
3235                         if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3236                                 goto do_stall;
3237                         e = get_ep_by_addr(dev, w_index);
3238                         if (!e)
3239                                 goto do_stall;
3240                         if (e->wedged) {
3241                                 ep_vdbg(dev, "%s wedged, halt not cleared\n",
3242                                                 ep->ep.name);
3243                         } else {
3244                                 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3245                                 clear_halt(e);
3246                                 if ((ep->dev->quirks & PLX_PCIE) &&
3247                                         !list_empty(&e->queue) && e->td_dma)
3248                                                 restart_dma(e);
3249                         }
3250                         allow_status(ep);
3251                         goto next_endpoints;
3252                         }
3253                         break;
3254                 case USB_REQ_SET_FEATURE: {
3255                         struct net2280_ep       *e;
3256
3257                         /* hw handles device features */
3258                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3259                                 goto delegate;
3260                         if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3261                                 goto do_stall;
3262                         e = get_ep_by_addr(dev, w_index);
3263                         if (!e)
3264                                 goto do_stall;
3265                         if (e->ep.name == ep0name)
3266                                 goto do_stall;
3267                         set_halt(e);
3268                         if ((dev->quirks & PLX_PCIE) && e->dma)
3269                                 abort_dma(e);
3270                         allow_status(ep);
3271                         ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3272                         goto next_endpoints;
3273                         }
3274                         break;
3275                 default:
3276 delegate:
3277                         ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3278                                 "ep_cfg %08x\n",
3279                                 u.r.bRequestType, u.r.bRequest,
3280                                 w_value, w_index, w_length,
3281                                 readl(&ep->cfg->ep_cfg));
3282                         ep->responded = 0;
3283                         spin_unlock(&dev->lock);
3284                         tmp = dev->driver->setup(&dev->gadget, &u.r);
3285                         spin_lock(&dev->lock);
3286                 }
3287
3288                 /* stall ep0 on error */
3289                 if (tmp < 0) {
3290 do_stall:
3291                         ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3292                                         u.r.bRequestType, u.r.bRequest, tmp);
3293                         dev->protocol_stall = 1;
3294                 }
3295
3296                 /* some in/out token irq should follow; maybe stall then.
3297                  * driver must queue a request (even zlp) or halt ep0
3298                  * before the host times out.
3299                  */
3300         }
3301
3302 #undef  w_value
3303 #undef  w_index
3304 #undef  w_length
3305
3306 next_endpoints:
3307         if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
3308                 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3309                         USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3310                         USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3311
3312                 if (stat & mask) {
3313                         usb338x_handle_ep_intr(dev, stat & mask);
3314                         stat &= ~mask;
3315                 }
3316         } else {
3317                 /* endpoint data irq ? */
3318                 scratch = stat & 0x7f;
3319                 stat &= ~0x7f;
3320                 for (num = 0; scratch; num++) {
3321                         u32             t;
3322
3323                         /* do this endpoint's FIFO and queue need tending? */
3324                         t = BIT(num);
3325                         if ((scratch & t) == 0)
3326                                 continue;
3327                         scratch ^= t;
3328
3329                         ep = &dev->ep[num];
3330                         handle_ep_small(ep);
3331                 }
3332         }
3333
3334         if (stat)
3335                 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3336 }
3337
3338 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3339                 BIT(DMA_C_INTERRUPT) | \
3340                 BIT(DMA_B_INTERRUPT) | \
3341                 BIT(DMA_A_INTERRUPT))
3342 #define PCI_ERROR_INTERRUPTS ( \
3343                 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3344                 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3345                 BIT(PCI_RETRY_ABORT_INTERRUPT))
3346
3347 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3348 __releases(dev->lock)
3349 __acquires(dev->lock)
3350 {
3351         struct net2280_ep       *ep;
3352         u32                     tmp, num, mask, scratch;
3353
3354         /* after disconnect there's nothing else to do! */
3355         tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3356         mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3357
3358         /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3359          * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3360          * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3361          * only indicates a change in the reset state).
3362          */
3363         if (stat & tmp) {
3364                 bool    reset = false;
3365                 bool    disconnect = false;
3366
3367                 /*
3368                  * Ignore disconnects and resets if the speed hasn't been set.
3369                  * VBUS can bounce and there's always an initial reset.
3370                  */
3371                 writel(tmp, &dev->regs->irqstat1);
3372                 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3373                         if ((stat & BIT(VBUS_INTERRUPT)) &&
3374                                         (readl(&dev->usb->usbctl) &
3375                                                 BIT(VBUS_PIN)) == 0) {
3376                                 disconnect = true;
3377                                 ep_dbg(dev, "disconnect %s\n",
3378                                                 dev->driver->driver.name);
3379                         } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3380                                         (readl(&dev->usb->usbstat) & mask)
3381                                                 == 0) {
3382                                 reset = true;
3383                                 ep_dbg(dev, "reset %s\n",
3384                                                 dev->driver->driver.name);
3385                         }
3386
3387                         if (disconnect || reset) {
3388                                 stop_activity(dev, dev->driver);
3389                                 ep0_start(dev);
3390                                 spin_unlock(&dev->lock);
3391                                 if (reset)
3392                                         usb_gadget_udc_reset
3393                                                 (&dev->gadget, dev->driver);
3394                                 else
3395                                         (dev->driver->disconnect)
3396                                                 (&dev->gadget);
3397                                 spin_lock(&dev->lock);
3398                                 return;
3399                         }
3400                 }
3401                 stat &= ~tmp;
3402
3403                 /* vBUS can bounce ... one of many reasons to ignore the
3404                  * notion of hotplug events on bus connect/disconnect!
3405                  */
3406                 if (!stat)
3407                         return;
3408         }
3409
3410         /* NOTE: chip stays in PCI D0 state for now, but it could
3411          * enter D1 to save more power
3412          */
3413         tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3414         if (stat & tmp) {
3415                 writel(tmp, &dev->regs->irqstat1);
3416                 spin_unlock(&dev->lock);
3417                 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3418                         if (dev->driver->suspend)
3419                                 dev->driver->suspend(&dev->gadget);
3420                         if (!enable_suspend)
3421                                 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3422                 } else {
3423                         if (dev->driver->resume)
3424                                 dev->driver->resume(&dev->gadget);
3425                         /* at high speed, note erratum 0133 */
3426                 }
3427                 spin_lock(&dev->lock);
3428                 stat &= ~tmp;
3429         }
3430
3431         /* clear any other status/irqs */
3432         if (stat)
3433                 writel(stat, &dev->regs->irqstat1);
3434
3435         /* some status we can just ignore */
3436         if (dev->quirks & PLX_2280)
3437                 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3438                           BIT(SUSPEND_REQUEST_INTERRUPT) |
3439                           BIT(RESUME_INTERRUPT) |
3440                           BIT(SOF_INTERRUPT));
3441         else
3442                 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3443                           BIT(RESUME_INTERRUPT) |
3444                           BIT(SOF_DOWN_INTERRUPT) |
3445                           BIT(SOF_INTERRUPT));
3446
3447         if (!stat)
3448                 return;
3449         /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3450
3451         /* DMA status, for ep-{a,b,c,d} */
3452         scratch = stat & DMA_INTERRUPTS;
3453         stat &= ~DMA_INTERRUPTS;
3454         scratch >>= 9;
3455         for (num = 0; scratch; num++) {
3456                 struct net2280_dma_regs __iomem *dma;
3457
3458                 tmp = BIT(num);
3459                 if ((tmp & scratch) == 0)
3460                         continue;
3461                 scratch ^= tmp;
3462
3463                 ep = &dev->ep[num + 1];
3464                 dma = ep->dma;
3465
3466                 if (!dma)
3467                         continue;
3468
3469                 /* clear ep's dma status */
3470                 tmp = readl(&dma->dmastat);
3471                 writel(tmp, &dma->dmastat);
3472
3473                 /* dma sync*/
3474                 if (dev->quirks & PLX_PCIE) {
3475                         u32 r_dmacount = readl(&dma->dmacount);
3476                         if (!ep->is_in &&  (r_dmacount & 0x00FFFFFF) &&
3477                             (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3478                                 continue;
3479                 }
3480
3481                 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3482                         ep_dbg(ep->dev, "%s no xact done? %08x\n",
3483                                 ep->ep.name, tmp);
3484                         continue;
3485                 }
3486                 stop_dma(ep->dma);
3487
3488                 /* OUT transfers terminate when the data from the
3489                  * host is in our memory.  Process whatever's done.
3490                  * On this path, we know transfer's last packet wasn't
3491                  * less than req->length. NAK_OUT_PACKETS may be set,
3492                  * or the FIFO may already be holding new packets.
3493                  *
3494                  * IN transfers can linger in the FIFO for a very
3495                  * long time ... we ignore that for now, accounting
3496                  * precisely (like PIO does) needs per-packet irqs
3497                  */
3498                 scan_dma_completions(ep);
3499
3500                 /* disable dma on inactive queues; else maybe restart */
3501                 if (!list_empty(&ep->queue)) {
3502                         tmp = readl(&dma->dmactl);
3503                         restart_dma(ep);
3504                 }
3505                 ep->irqs++;
3506         }
3507
3508         /* NOTE:  there are other PCI errors we might usefully notice.
3509          * if they appear very often, here's where to try recovering.
3510          */
3511         if (stat & PCI_ERROR_INTERRUPTS) {
3512                 ep_err(dev, "pci dma error; stat %08x\n", stat);
3513                 stat &= ~PCI_ERROR_INTERRUPTS;
3514                 /* these are fatal errors, but "maybe" they won't
3515                  * happen again ...
3516                  */
3517                 stop_activity(dev, dev->driver);
3518                 ep0_start(dev);
3519                 stat = 0;
3520         }
3521
3522         if (stat)
3523                 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3524 }
3525
3526 static irqreturn_t net2280_irq(int irq, void *_dev)
3527 {
3528         struct net2280          *dev = _dev;
3529
3530         /* shared interrupt, not ours */
3531         if ((dev->quirks & PLX_LEGACY) &&
3532                 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3533                 return IRQ_NONE;
3534
3535         spin_lock(&dev->lock);
3536
3537         /* handle disconnect, dma, and more */
3538         handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3539
3540         /* control requests and PIO */
3541         handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3542
3543         if (dev->quirks & PLX_PCIE) {
3544                 /* re-enable interrupt to trigger any possible new interrupt */
3545                 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3546                 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3547                 writel(pciirqenb1, &dev->regs->pciirqenb1);
3548         }
3549
3550         spin_unlock(&dev->lock);
3551
3552         return IRQ_HANDLED;
3553 }
3554
3555 /*-------------------------------------------------------------------------*/
3556
3557 static void gadget_release(struct device *_dev)
3558 {
3559         struct net2280  *dev = dev_get_drvdata(_dev);
3560
3561         kfree(dev);
3562 }
3563
3564 /* tear down the binding between this driver and the pci device */
3565
3566 static void net2280_remove(struct pci_dev *pdev)
3567 {
3568         struct net2280          *dev = pci_get_drvdata(pdev);
3569
3570         usb_del_gadget_udc(&dev->gadget);
3571
3572         BUG_ON(dev->driver);
3573
3574         /* then clean up the resources we allocated during probe() */
3575         if (dev->requests) {
3576                 int             i;
3577                 for (i = 1; i < 5; i++) {
3578                         if (!dev->ep[i].dummy)
3579                                 continue;
3580                         dma_pool_free(dev->requests, dev->ep[i].dummy,
3581                                         dev->ep[i].td_dma);
3582                 }
3583                 dma_pool_destroy(dev->requests);
3584         }
3585         if (dev->got_irq)
3586                 free_irq(pdev->irq, dev);
3587         if (dev->quirks & PLX_PCIE)
3588                 pci_disable_msi(pdev);
3589         if (dev->regs) {
3590                 net2280_led_shutdown(dev);
3591                 iounmap(dev->regs);
3592         }
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 = dma_pool_create("requests", &pdev->dev,
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 = dma_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                 kfree(dev);
3788         }
3789         return retval;
3790 }
3791
3792 /* make sure the board is quiescent; otherwise it will continue
3793  * generating IRQs across the upcoming reboot.
3794  */
3795
3796 static void net2280_shutdown(struct pci_dev *pdev)
3797 {
3798         struct net2280          *dev = pci_get_drvdata(pdev);
3799
3800         /* disable IRQs */
3801         writel(0, &dev->regs->pciirqenb0);
3802         writel(0, &dev->regs->pciirqenb1);
3803
3804         /* disable the pullup so the host will think we're gone */
3805         writel(0, &dev->usb->usbctl);
3806
3807 }
3808
3809
3810 /*-------------------------------------------------------------------------*/
3811
3812 static const struct pci_device_id pci_ids[] = { {
3813         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3814         .class_mask =   ~0,
3815         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3816         .device =       0x2280,
3817         .subvendor =    PCI_ANY_ID,
3818         .subdevice =    PCI_ANY_ID,
3819         .driver_data =  PLX_LEGACY | PLX_2280,
3820         }, {
3821         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3822         .class_mask =   ~0,
3823         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3824         .device =       0x2282,
3825         .subvendor =    PCI_ANY_ID,
3826         .subdevice =    PCI_ANY_ID,
3827         .driver_data =  PLX_LEGACY,
3828         },
3829         {
3830         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3831         .class_mask =   ~0,
3832         .vendor =       PCI_VENDOR_ID_PLX,
3833         .device =       0x2380,
3834         .subvendor =    PCI_ANY_ID,
3835         .subdevice =    PCI_ANY_ID,
3836         .driver_data =  PLX_PCIE,
3837          },
3838         {
3839         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3840         .class_mask =   ~0,
3841         .vendor =       PCI_VENDOR_ID_PLX,
3842         .device =       0x3380,
3843         .subvendor =    PCI_ANY_ID,
3844         .subdevice =    PCI_ANY_ID,
3845         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3846          },
3847         {
3848         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3849         .class_mask =   ~0,
3850         .vendor =       PCI_VENDOR_ID_PLX,
3851         .device =       0x3382,
3852         .subvendor =    PCI_ANY_ID,
3853         .subdevice =    PCI_ANY_ID,
3854         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3855          },
3856 { /* end: all zeroes */ }
3857 };
3858 MODULE_DEVICE_TABLE(pci, pci_ids);
3859
3860 /* pci driver glue; this is a "new style" PCI driver module */
3861 static struct pci_driver net2280_pci_driver = {
3862         .name =         (char *) driver_name,
3863         .id_table =     pci_ids,
3864
3865         .probe =        net2280_probe,
3866         .remove =       net2280_remove,
3867         .shutdown =     net2280_shutdown,
3868
3869         /* FIXME add power management support */
3870 };
3871
3872 module_pci_driver(net2280_pci_driver);
3873
3874 MODULE_DESCRIPTION(DRIVER_DESC);
3875 MODULE_AUTHOR("David Brownell");
3876 MODULE_LICENSE("GPL");