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