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