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