drivers/usb/gadget/udc/net2280.c

   1 /*
   2  * Driver for the PLX NET2280 USB device controller.
   3  * Specs and errata are available from <http://www.plxtech.com>.
   4  *
   5  * PLX Technology Inc. (formerly NetChip Technology) supported the
   6  * development of this driver.
   7  *
   8  *
   9  * CODE STATUS HIGHLIGHTS
  10  *
  11  * This driver should work well with most "gadget" drivers, including
  12  * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
  13  * as well as Gadget Zero and Gadgetfs.
  14  *
  15  * DMA is enabled by default.
  16  *
  17  * MSI is enabled by default.  The legacy IRQ is used if MSI couldn't
  18  * be enabled.
  19  *
  20  * Note that almost all the errata workarounds here are only needed for
  21  * rev1 chips.  Rev1a silicon (0110) fixes almost all of them.
  22  */
  23
  24 /*
  25  * Copyright (C) 2003 David Brownell
  26  * Copyright (C) 2003-2005 PLX Technology, Inc.
  27  * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
  28  *
  29  * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
  30  *      with 2282 chip
  31  *
  32  * Modified Ricardo Ribalda Qtechnology AS  to provide compatibility
  33  *      with usb 338x chip. Based on PLX driver
  34  *
  35  * This program is free software; you can redistribute it and/or modify
  36  * it under the terms of the GNU General Public License as published by
  37  * the Free Software Foundation; either version 2 of the License, or
  38  * (at your option) any later version.
  39  */
  40
  41 #include <linux/module.h>
  42 #include <linux/pci.h>
  43 #include <linux/dma-mapping.h>
  44 #include <linux/kernel.h>
  45 #include <linux/delay.h>
  46 #include <linux/ioport.h>
  47 #include <linux/slab.h>
  48 #include <linux/errno.h>
  49 #include <linux/init.h>
  50 #include <linux/timer.h>
  51 #include <linux/list.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/moduleparam.h>
  54 #include <linux/device.h>
  55 #include <linux/usb/ch9.h>
  56 #include <linux/usb/gadget.h>
  57 #include <linux/prefetch.h>
  58 #include <linux/io.h>
  59
  60 #include <asm/byteorder.h>
  61 #include <asm/irq.h>
  62 #include <asm/unaligned.h>
  63
  64 #define DRIVER_DESC             "PLX NET228x/USB338x USB Peripheral Controller"
  65 #define DRIVER_VERSION          "2005 Sept 27/v3.0"
  66
  67 #define EP_DONTUSE              13      /* nonzero */
  68
  69 #define USE_RDK_LEDS            /* GPIO pins control three LEDs */
  70
  71
  72 static const char driver_name[] = "net2280";
  73 static const char driver_desc[] = DRIVER_DESC;
  74
  75 static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
  76 static const char ep0name[] = "ep0";
  77
  78 #define EP_INFO(_name, _caps) \
  79         { \
  80                 .name = _name, \
  81                 .caps = _caps, \
  82         }
  83
  84 static const struct {
  85         const char *name;
  86         const struct usb_ep_caps caps;
  87 } ep_info_dft[] = { /* Default endpoint configuration */
  88         EP_INFO(ep0name,
  89                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
  90         EP_INFO("ep-a",
  91                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  92         EP_INFO("ep-b",
  93                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  94         EP_INFO("ep-c",
  95                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  96         EP_INFO("ep-d",
  97                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  98         EP_INFO("ep-e",
  99                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 100         EP_INFO("ep-f",
 101                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 102         EP_INFO("ep-g",
 103                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 104         EP_INFO("ep-h",
 105                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 106 }, ep_info_adv[] = { /* Endpoints for usb3380 advance mode */
 107         EP_INFO(ep0name,
 108                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
 109         EP_INFO("ep1in",
 110                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 111         EP_INFO("ep2out",
 112                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 113         EP_INFO("ep3in",
 114                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 115         EP_INFO("ep4out",
 116                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 117         EP_INFO("ep1out",
 118                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 119         EP_INFO("ep2in",
 120                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 121         EP_INFO("ep3out",
 122                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 123         EP_INFO("ep4in",
 124                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 125 };
 126
 127 #undef EP_INFO
 128
 129 /* mode 0 == ep-{a,b,c,d} 1K fifo each
 130  * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
 131  * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
 132  */
 133 static ushort fifo_mode;
 134
 135 /* "modprobe net2280 fifo_mode=1" etc */
 136 module_param(fifo_mode, ushort, 0644);
 137
 138 /* enable_suspend -- When enabled, the driver will respond to
 139  * USB suspend requests by powering down the NET2280.  Otherwise,
 140  * USB suspend requests will be ignored.  This is acceptable for
 141  * self-powered devices
 142  */
 143 static bool enable_suspend;
 144
 145 /* "modprobe net2280 enable_suspend=1" etc */
 146 module_param(enable_suspend, bool, 0444);
 147
 148 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
 149
 150 static char *type_string(u8 bmAttributes)
 151 {
 152         switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
 153         case USB_ENDPOINT_XFER_BULK:    return "bulk";
 154         case USB_ENDPOINT_XFER_ISOC:    return "iso";
 155         case USB_ENDPOINT_XFER_INT:     return "intr";
 156         }
 157         return "control";
 158 }
 159
 160 #include "net2280.h"
 161
 162 #define valid_bit       cpu_to_le32(BIT(VALID_BIT))
 163 #define dma_done_ie     cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
 164
 165 static void ep_clear_seqnum(struct net2280_ep *ep);
 166 static void stop_activity(struct net2280 *dev,
 167                                         struct usb_gadget_driver *driver);
 168 static void ep0_start(struct net2280 *dev);
 169
 170 /*-------------------------------------------------------------------------*/
 171 static inline void enable_pciirqenb(struct net2280_ep *ep)
 172 {
 173         u32 tmp = readl(&ep->dev->regs->pciirqenb0);
 174
 175         if (ep->dev->quirks & PLX_LEGACY)
 176                 tmp |= BIT(ep->num);
 177         else
 178                 tmp |= BIT(ep_bit[ep->num]);
 179         writel(tmp, &ep->dev->regs->pciirqenb0);
 180
 181         return;
 182 }
 183
 184 static int
 185 net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 186 {
 187         struct net2280          *dev;
 188         struct net2280_ep       *ep;
 189         u32                     max;
 190         u32 tmp = 0;
 191         u32 type;
 192         unsigned long           flags;
 193         static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
 194         int ret = 0;
 195
 196         ep = container_of(_ep, struct net2280_ep, ep);
 197         if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
 198                         desc->bDescriptorType != USB_DT_ENDPOINT) {
 199                 pr_err("%s: failed at line=%d\n", __func__, __LINE__);
 200                 return -EINVAL;
 201         }
 202         dev = ep->dev;
 203         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 204                 ret = -ESHUTDOWN;
 205                 goto print_err;
 206         }
 207
 208         /* erratum 0119 workaround ties up an endpoint number */
 209         if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
 210                 ret = -EDOM;
 211                 goto print_err;
 212         }
 213
 214         if (dev->quirks & PLX_PCIE) {
 215                 if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
 216                         ret = -EDOM;
 217                         goto print_err;
 218                 }
 219                 ep->is_in = !!usb_endpoint_dir_in(desc);
 220                 if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
 221                         ret = -EINVAL;
 222                         goto print_err;
 223                 }
 224         }
 225
 226         /* sanity check ep-e/ep-f since their fifos are small */
 227         max = usb_endpoint_maxp(desc);
 228         if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
 229                 ret = -ERANGE;
 230                 goto print_err;
 231         }
 232
 233         spin_lock_irqsave(&dev->lock, flags);
 234         _ep->maxpacket = max;
 235         ep->desc = desc;
 236
 237         /* ep_reset() has already been called */
 238         ep->stopped = 0;
 239         ep->wedged = 0;
 240         ep->out_overflow = 0;
 241
 242         /* set speed-dependent max packet; may kick in high bandwidth */
 243         set_max_speed(ep, max);
 244
 245         /* set type, direction, address; reset fifo counters */
 246         writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
 247
 248         if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
 249                 tmp = readl(&ep->cfg->ep_cfg);
 250                 /* If USB ep number doesn't match hardware ep number */
 251                 if ((tmp & 0xf) != usb_endpoint_num(desc)) {
 252                         ret = -EINVAL;
 253                         spin_unlock_irqrestore(&dev->lock, flags);
 254                         goto print_err;
 255                 }
 256                 if (ep->is_in)
 257                         tmp &= ~USB3380_EP_CFG_MASK_IN;
 258                 else
 259                         tmp &= ~USB3380_EP_CFG_MASK_OUT;
 260         }
 261         type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 262         if (type == USB_ENDPOINT_XFER_INT) {
 263                 /* erratum 0105 workaround prevents hs NYET */
 264                 if (dev->chiprev == 0100 &&
 265                                 dev->gadget.speed == USB_SPEED_HIGH &&
 266                                 !(desc->bEndpointAddress & USB_DIR_IN))
 267                         writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
 268                                 &ep->regs->ep_rsp);
 269         } else if (type == USB_ENDPOINT_XFER_BULK) {
 270                 /* catch some particularly blatant driver bugs */
 271                 if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
 272                     (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
 273                     (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
 274                         spin_unlock_irqrestore(&dev->lock, flags);
 275                         ret = -ERANGE;
 276                         goto print_err;
 277                 }
 278         }
 279         ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC);
 280         /* Enable this endpoint */
 281         if (dev->quirks & PLX_LEGACY) {
 282                 tmp |= type << ENDPOINT_TYPE;
 283                 tmp |= desc->bEndpointAddress;
 284                 /* default full fifo lines */
 285                 tmp |= (4 << ENDPOINT_BYTE_COUNT);
 286                 tmp |= BIT(ENDPOINT_ENABLE);
 287                 ep->is_in = (tmp & USB_DIR_IN) != 0;
 288         } else {
 289                 /* In Legacy mode, only OUT endpoints are used */
 290                 if (dev->enhanced_mode && ep->is_in) {
 291                         tmp |= type << IN_ENDPOINT_TYPE;
 292                         tmp |= BIT(IN_ENDPOINT_ENABLE);
 293                 } else {
 294                         tmp |= type << OUT_ENDPOINT_TYPE;
 295                         tmp |= BIT(OUT_ENDPOINT_ENABLE);
 296                         tmp |= (ep->is_in << ENDPOINT_DIRECTION);
 297                 }
 298
 299                 tmp |= (4 << ENDPOINT_BYTE_COUNT);
 300                 if (!dev->enhanced_mode)
 301                         tmp |= usb_endpoint_num(desc);
 302                 tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
 303         }
 304
 305         /* Make sure all the registers are written before ep_rsp*/
 306         wmb();
 307
 308         /* for OUT transfers, block the rx fifo until a read is posted */
 309         if (!ep->is_in)
 310                 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 311         else if (!(dev->quirks & PLX_2280)) {
 312                 /* Added for 2282, Don't use nak packets on an in endpoint,
 313                  * this was ignored on 2280
 314                  */
 315                 writel(BIT(CLEAR_NAK_OUT_PACKETS) |
 316                         BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
 317         }
 318
 319         if (dev->quirks & PLX_PCIE)
 320                 ep_clear_seqnum(ep);
 321         writel(tmp, &ep->cfg->ep_cfg);
 322
 323         /* enable irqs */
 324         if (!ep->dma) {                         /* pio, per-packet */
 325                 enable_pciirqenb(ep);
 326
 327                 tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
 328                         BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
 329                 if (dev->quirks & PLX_2280)
 330                         tmp |= readl(&ep->regs->ep_irqenb);
 331                 writel(tmp, &ep->regs->ep_irqenb);
 332         } else {                                /* dma, per-request */
 333                 tmp = BIT((8 + ep->num));       /* completion */
 334                 tmp |= readl(&dev->regs->pciirqenb1);
 335                 writel(tmp, &dev->regs->pciirqenb1);
 336
 337                 /* for short OUT transfers, dma completions can't
 338                  * advance the queue; do it pio-style, by hand.
 339                  * NOTE erratum 0112 workaround #2
 340                  */
 341                 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
 342                         tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
 343                         writel(tmp, &ep->regs->ep_irqenb);
 344
 345                         enable_pciirqenb(ep);
 346                 }
 347         }
 348
 349         tmp = desc->bEndpointAddress;
 350         ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
 351                 _ep->name, tmp & 0x0f, DIR_STRING(tmp),
 352                 type_string(desc->bmAttributes),
 353                 ep->dma ? "dma" : "pio", max);
 354
 355         /* pci writes may still be posted */
 356         spin_unlock_irqrestore(&dev->lock, flags);
 357         return ret;
 358
 359 print_err:
 360         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
 361         return ret;
 362 }
 363
 364 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
 365 {
 366         u32     result;
 367
 368         do {
 369                 result = readl(ptr);
 370                 if (result == ~(u32)0)          /* "device unplugged" */
 371                         return -ENODEV;
 372                 result &= mask;
 373                 if (result == done)
 374                         return 0;
 375                 udelay(1);
 376                 usec--;
 377         } while (usec > 0);
 378         return -ETIMEDOUT;
 379 }
 380
 381 static const struct usb_ep_ops net2280_ep_ops;
 382
 383 static void ep_reset_228x(struct net2280_regs __iomem *regs,
 384                           struct net2280_ep *ep)
 385 {
 386         u32             tmp;
 387
 388         ep->desc = NULL;
 389         INIT_LIST_HEAD(&ep->queue);
 390
 391         usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 392         ep->ep.ops = &net2280_ep_ops;
 393
 394         /* disable the dma, irqs, endpoint... */
 395         if (ep->dma) {
 396                 writel(0, &ep->dma->dmactl);
 397                 writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 398                         BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
 399                         BIT(DMA_ABORT),
 400                         &ep->dma->dmastat);
 401
 402                 tmp = readl(&regs->pciirqenb0);
 403                 tmp &= ~BIT(ep->num);
 404                 writel(tmp, &regs->pciirqenb0);
 405         } else {
 406                 tmp = readl(&regs->pciirqenb1);
 407                 tmp &= ~BIT((8 + ep->num));     /* completion */
 408                 writel(tmp, &regs->pciirqenb1);
 409         }
 410         writel(0, &ep->regs->ep_irqenb);
 411
 412         /* init to our chosen defaults, notably so that we NAK OUT
 413          * packets until the driver queues a read (+note erratum 0112)
 414          */
 415         if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
 416                 tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
 417                 BIT(SET_NAK_OUT_PACKETS) |
 418                 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 419                 BIT(CLEAR_INTERRUPT_MODE);
 420         } else {
 421                 /* added for 2282 */
 422                 tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
 423                 BIT(CLEAR_NAK_OUT_PACKETS) |
 424                 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 425                 BIT(CLEAR_INTERRUPT_MODE);
 426         }
 427
 428         if (ep->num != 0) {
 429                 tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
 430                         BIT(CLEAR_ENDPOINT_HALT);
 431         }
 432         writel(tmp, &ep->regs->ep_rsp);
 433
 434         /* scrub most status bits, and flush any fifo state */
 435         if (ep->dev->quirks & PLX_2280)
 436                 tmp = BIT(FIFO_OVERFLOW) |
 437                         BIT(FIFO_UNDERFLOW);
 438         else
 439                 tmp = 0;
 440
 441         writel(tmp | BIT(TIMEOUT) |
 442                 BIT(USB_STALL_SENT) |
 443                 BIT(USB_IN_NAK_SENT) |
 444                 BIT(USB_IN_ACK_RCVD) |
 445                 BIT(USB_OUT_PING_NAK_SENT) |
 446                 BIT(USB_OUT_ACK_SENT) |
 447                 BIT(FIFO_FLUSH) |
 448                 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 449                 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 450                 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 451                 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 452                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 453                 BIT(DATA_IN_TOKEN_INTERRUPT),
 454                 &ep->regs->ep_stat);
 455
 456         /* fifo size is handled separately */
 457 }
 458
 459 static void ep_reset_338x(struct net2280_regs __iomem *regs,
 460                                         struct net2280_ep *ep)
 461 {
 462         u32 tmp, dmastat;
 463
 464         ep->desc = NULL;
 465         INIT_LIST_HEAD(&ep->queue);
 466
 467         usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 468         ep->ep.ops = &net2280_ep_ops;
 469
 470         /* disable the dma, irqs, endpoint... */
 471         if (ep->dma) {
 472                 writel(0, &ep->dma->dmactl);
 473                 writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
 474                        BIT(DMA_PAUSE_DONE_INTERRUPT) |
 475                        BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 476                        BIT(DMA_TRANSACTION_DONE_INTERRUPT),
 477                        /* | BIT(DMA_ABORT), */
 478                        &ep->dma->dmastat);
 479
 480                 dmastat = readl(&ep->dma->dmastat);
 481                 if (dmastat == 0x5002) {
 482                         ep_warn(ep->dev, "The dmastat return = %x!!\n",
 483                                dmastat);
 484                         writel(0x5a, &ep->dma->dmastat);
 485                 }
 486
 487                 tmp = readl(&regs->pciirqenb0);
 488                 tmp &= ~BIT(ep_bit[ep->num]);
 489                 writel(tmp, &regs->pciirqenb0);
 490         } else {
 491                 if (ep->num < 5) {
 492                         tmp = readl(&regs->pciirqenb1);
 493                         tmp &= ~BIT((8 + ep->num));     /* completion */
 494                         writel(tmp, &regs->pciirqenb1);
 495                 }
 496         }
 497         writel(0, &ep->regs->ep_irqenb);
 498
 499         writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 500                BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 501                BIT(FIFO_OVERFLOW) |
 502                BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 503                BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 504                BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 505                BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
 506
 507         tmp = readl(&ep->cfg->ep_cfg);
 508         if (ep->is_in)
 509                 tmp &= ~USB3380_EP_CFG_MASK_IN;
 510         else
 511                 tmp &= ~USB3380_EP_CFG_MASK_OUT;
 512         writel(tmp, &ep->cfg->ep_cfg);
 513 }
 514
 515 static void nuke(struct net2280_ep *);
 516
 517 static int net2280_disable(struct usb_ep *_ep)
 518 {
 519         struct net2280_ep       *ep;
 520         unsigned long           flags;
 521
 522         ep = container_of(_ep, struct net2280_ep, ep);
 523         if (!_ep || !ep->desc || _ep->name == ep0name) {
 524                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
 525                 return -EINVAL;
 526         }
 527         spin_lock_irqsave(&ep->dev->lock, flags);
 528         nuke(ep);
 529
 530         if (ep->dev->quirks & PLX_PCIE)
 531                 ep_reset_338x(ep->dev->regs, ep);
 532         else
 533                 ep_reset_228x(ep->dev->regs, ep);
 534
 535         ep_vdbg(ep->dev, "disabled %s %s\n",
 536                         ep->dma ? "dma" : "pio", _ep->name);
 537
 538         /* synch memory views with the device */
 539         (void)readl(&ep->cfg->ep_cfg);
 540
 541         if (!ep->dma && ep->num >= 1 && ep->num <= 4)
 542                 ep->dma = &ep->dev->dma[ep->num - 1];
 543
 544         spin_unlock_irqrestore(&ep->dev->lock, flags);
 545         return 0;
 546 }
 547
 548 /*-------------------------------------------------------------------------*/
 549
 550 static struct usb_request
 551 *net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 552 {
 553         struct net2280_ep       *ep;
 554         struct net2280_request  *req;
 555
 556         if (!_ep) {
 557                 pr_err("%s: Invalid ep\n", __func__);
 558                 return NULL;
 559         }
 560         ep = container_of(_ep, struct net2280_ep, ep);
 561
 562         req = kzalloc(sizeof(*req), gfp_flags);
 563         if (!req)
 564                 return NULL;
 565
 566         INIT_LIST_HEAD(&req->queue);
 567
 568         /* this dma descriptor may be swapped with the previous dummy */
 569         if (ep->dma) {
 570                 struct net2280_dma      *td;
 571
 572                 td = dma_pool_alloc(ep->dev->requests, gfp_flags,
 573                                 &req->td_dma);
 574                 if (!td) {
 575                         kfree(req);
 576                         return NULL;
 577                 }
 578                 td->dmacount = 0;       /* not VALID */
 579                 td->dmadesc = td->dmaaddr;
 580                 req->td = td;
 581         }
 582         return &req->req;
 583 }
 584
 585 static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
 586 {
 587         struct net2280_ep       *ep;
 588         struct net2280_request  *req;
 589
 590         ep = container_of(_ep, struct net2280_ep, ep);
 591         if (!_ep || !_req) {
 592                 dev_err(&ep->dev->pdev->dev, "%s: Invalid ep=%p or req=%p\n",
 593                                                         __func__, _ep, _req);
 594                 return;
 595         }
 596
 597         req = container_of(_req, struct net2280_request, req);
 598         WARN_ON(!list_empty(&req->queue));
 599         if (req->td)
 600                 dma_pool_free(ep->dev->requests, req->td, req->td_dma);
 601         kfree(req);
 602 }
 603
 604 /*-------------------------------------------------------------------------*/
 605
 606 /* load a packet into the fifo we use for usb IN transfers.
 607  * works for all endpoints.
 608  *
 609  * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
 610  * at a time, but this code is simpler because it knows it only writes
 611  * one packet.  ep-a..ep-d should use dma instead.
 612  */
 613 static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
 614 {
 615         struct net2280_ep_regs  __iomem *regs = ep->regs;
 616         u8                      *buf;
 617         u32                     tmp;
 618         unsigned                count, total;
 619
 620         /* INVARIANT:  fifo is currently empty. (testable) */
 621
 622         if (req) {
 623                 buf = req->buf + req->actual;
 624                 prefetch(buf);
 625                 total = req->length - req->actual;
 626         } else {
 627                 total = 0;
 628                 buf = NULL;
 629         }
 630
 631         /* write just one packet at a time */
 632         count = ep->ep.maxpacket;
 633         if (count > total)      /* min() cannot be used on a bitfield */
 634                 count = total;
 635
 636         ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
 637                         ep->ep.name, count,
 638                         (count != ep->ep.maxpacket) ? " (short)" : "",
 639                         req);
 640         while (count >= 4) {
 641                 /* NOTE be careful if you try to align these. fifo lines
 642                  * should normally be full (4 bytes) and successive partial
 643                  * lines are ok only in certain cases.
 644                  */
 645                 tmp = get_unaligned((u32 *)buf);
 646                 cpu_to_le32s(&tmp);
 647                 writel(tmp, &regs->ep_data);
 648                 buf += 4;
 649                 count -= 4;
 650         }
 651
 652         /* last fifo entry is "short" unless we wrote a full packet.
 653          * also explicitly validate last word in (periodic) transfers
 654          * when maxpacket is not a multiple of 4 bytes.
 655          */
 656         if (count || total < ep->ep.maxpacket) {
 657                 tmp = count ? get_unaligned((u32 *)buf) : count;
 658                 cpu_to_le32s(&tmp);
 659                 set_fifo_bytecount(ep, count & 0x03);
 660                 writel(tmp, &regs->ep_data);
 661         }
 662
 663         /* pci writes may still be posted */
 664 }
 665
 666 /* work around erratum 0106: PCI and USB race over the OUT fifo.
 667  * caller guarantees chiprev 0100, out endpoint is NAKing, and
 668  * there's no real data in the fifo.
 669  *
 670  * NOTE:  also used in cases where that erratum doesn't apply:
 671  * where the host wrote "too much" data to us.
 672  */
 673 static void out_flush(struct net2280_ep *ep)
 674 {
 675         u32     __iomem *statp;
 676         u32     tmp;
 677
 678         statp = &ep->regs->ep_stat;
 679
 680         tmp = readl(statp);
 681         if (tmp & BIT(NAK_OUT_PACKETS)) {
 682                 ep_dbg(ep->dev, "%s %s %08x !NAK\n",
 683                         ep->ep.name, __func__, tmp);
 684                 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 685         }
 686
 687         writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 688                 BIT(DATA_PACKET_RECEIVED_INTERRUPT),
 689                 statp);
 690         writel(BIT(FIFO_FLUSH), statp);
 691         /* Make sure that stap is written */
 692         mb();
 693         tmp = readl(statp);
 694         if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
 695                         /* high speed did bulk NYET; fifo isn't filling */
 696                         ep->dev->gadget.speed == USB_SPEED_FULL) {
 697                 unsigned        usec;
 698
 699                 usec = 50;              /* 64 byte bulk/interrupt */
 700                 handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
 701                                 BIT(USB_OUT_PING_NAK_SENT), usec);
 702                 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
 703         }
 704 }
 705
 706 /* unload packet(s) from the fifo we use for usb OUT transfers.
 707  * returns true iff the request completed, because of short packet
 708  * or the request buffer having filled with full packets.
 709  *
 710  * for ep-a..ep-d this will read multiple packets out when they
 711  * have been accepted.
 712  */
 713 static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
 714 {
 715         struct net2280_ep_regs  __iomem *regs = ep->regs;
 716         u8                      *buf = req->req.buf + req->req.actual;
 717         unsigned                count, tmp, is_short;
 718         unsigned                cleanup = 0, prevent = 0;
 719
 720         /* erratum 0106 ... packets coming in during fifo reads might
 721          * be incompletely rejected.  not all cases have workarounds.
 722          */
 723         if (ep->dev->chiprev == 0x0100 &&
 724                         ep->dev->gadget.speed == USB_SPEED_FULL) {
 725                 udelay(1);
 726                 tmp = readl(&ep->regs->ep_stat);
 727                 if ((tmp & BIT(NAK_OUT_PACKETS)))
 728                         cleanup = 1;
 729                 else if ((tmp & BIT(FIFO_FULL))) {
 730                         start_out_naking(ep);
 731                         prevent = 1;
 732                 }
 733                 /* else: hope we don't see the problem */
 734         }
 735
 736         /* never overflow the rx buffer. the fifo reads packets until
 737          * it sees a short one; we might not be ready for them all.
 738          */
 739         prefetchw(buf);
 740         count = readl(&regs->ep_avail);
 741         if (unlikely(count == 0)) {
 742                 udelay(1);
 743                 tmp = readl(&ep->regs->ep_stat);
 744                 count = readl(&regs->ep_avail);
 745                 /* handled that data already? */
 746                 if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
 747                         return 0;
 748         }
 749
 750         tmp = req->req.length - req->req.actual;
 751         if (count > tmp) {
 752                 /* as with DMA, data overflow gets flushed */
 753                 if ((tmp % ep->ep.maxpacket) != 0) {
 754                         ep_err(ep->dev,
 755                                 "%s out fifo %d bytes, expected %d\n",
 756                                 ep->ep.name, count, tmp);
 757                         req->req.status = -EOVERFLOW;
 758                         cleanup = 1;
 759                         /* NAK_OUT_PACKETS will be set, so flushing is safe;
 760                          * the next read will start with the next packet
 761                          */
 762                 } /* else it's a ZLP, no worries */
 763                 count = tmp;
 764         }
 765         req->req.actual += count;
 766
 767         is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
 768
 769         ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
 770                         ep->ep.name, count, is_short ? " (short)" : "",
 771                         cleanup ? " flush" : "", prevent ? " nak" : "",
 772                         req, req->req.actual, req->req.length);
 773
 774         while (count >= 4) {
 775                 tmp = readl(&regs->ep_data);
 776                 cpu_to_le32s(&tmp);
 777                 put_unaligned(tmp, (u32 *)buf);
 778                 buf += 4;
 779                 count -= 4;
 780         }
 781         if (count) {
 782                 tmp = readl(&regs->ep_data);
 783                 /* LE conversion is implicit here: */
 784                 do {
 785                         *buf++ = (u8) tmp;
 786                         tmp >>= 8;
 787                 } while (--count);
 788         }
 789         if (cleanup)
 790                 out_flush(ep);
 791         if (prevent) {
 792                 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 793                 (void) readl(&ep->regs->ep_rsp);
 794         }
 795
 796         return is_short || ((req->req.actual == req->req.length) &&
 797                         !req->req.zero);
 798 }
 799
 800 /* fill out dma descriptor to match a given request */
 801 static void fill_dma_desc(struct net2280_ep *ep,
 802                                         struct net2280_request *req, int valid)
 803 {
 804         struct net2280_dma      *td = req->td;
 805         u32                     dmacount = req->req.length;
 806
 807         /* don't let DMA continue after a short OUT packet,
 808          * so overruns can't affect the next transfer.
 809          * in case of overruns on max-size packets, we can't
 810          * stop the fifo from filling but we can flush it.
 811          */
 812         if (ep->is_in)
 813                 dmacount |= BIT(DMA_DIRECTION);
 814         if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
 815                                         !(ep->dev->quirks & PLX_2280))
 816                 dmacount |= BIT(END_OF_CHAIN);
 817
 818         req->valid = valid;
 819         if (valid)
 820                 dmacount |= BIT(VALID_BIT);
 821         dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
 822
 823         /* td->dmadesc = previously set by caller */
 824         td->dmaaddr = cpu_to_le32 (req->req.dma);
 825
 826         /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
 827         wmb();
 828         td->dmacount = cpu_to_le32(dmacount);
 829 }
 830
 831 static const u32 dmactl_default =
 832                 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 833                 BIT(DMA_CLEAR_COUNT_ENABLE) |
 834                 /* erratum 0116 workaround part 1 (use POLLING) */
 835                 (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
 836                 BIT(DMA_VALID_BIT_POLLING_ENABLE) |
 837                 BIT(DMA_VALID_BIT_ENABLE) |
 838                 BIT(DMA_SCATTER_GATHER_ENABLE) |
 839                 /* erratum 0116 workaround part 2 (no AUTOSTART) */
 840                 BIT(DMA_ENABLE);
 841
 842 static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
 843 {
 844         handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
 845 }
 846
 847 static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
 848 {
 849         writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
 850         spin_stop_dma(dma);
 851 }
 852
 853 static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
 854 {
 855         struct net2280_dma_regs __iomem *dma = ep->dma;
 856         unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
 857
 858         if (!(ep->dev->quirks & PLX_2280))
 859                 tmp |= BIT(END_OF_CHAIN);
 860
 861         writel(tmp, &dma->dmacount);
 862         writel(readl(&dma->dmastat), &dma->dmastat);
 863
 864         writel(td_dma, &dma->dmadesc);
 865         if (ep->dev->quirks & PLX_PCIE)
 866                 dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
 867         writel(dmactl, &dma->dmactl);
 868
 869         /* erratum 0116 workaround part 3:  pci arbiter away from net2280 */
 870         (void) readl(&ep->dev->pci->pcimstctl);
 871
 872         writel(BIT(DMA_START), &dma->dmastat);
 873 }
 874
 875 static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
 876 {
 877         u32                     tmp;
 878         struct net2280_dma_regs __iomem *dma = ep->dma;
 879
 880         /* FIXME can't use DMA for ZLPs */
 881
 882         /* on this path we "know" there's no dma active (yet) */
 883         WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
 884         writel(0, &ep->dma->dmactl);
 885
 886         /* previous OUT packet might have been short */
 887         if (!ep->is_in && (readl(&ep->regs->ep_stat) &
 888                                 BIT(NAK_OUT_PACKETS))) {
 889                 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
 890                         &ep->regs->ep_stat);
 891
 892                 tmp = readl(&ep->regs->ep_avail);
 893                 if (tmp) {
 894                         writel(readl(&dma->dmastat), &dma->dmastat);
 895
 896                         /* transfer all/some fifo data */
 897                         writel(req->req.dma, &dma->dmaaddr);
 898                         tmp = min(tmp, req->req.length);
 899
 900                         /* dma irq, faking scatterlist status */
 901                         req->td->dmacount = cpu_to_le32(req->req.length - tmp);
 902                         writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
 903                                         &dma->dmacount);
 904                         req->td->dmadesc = 0;
 905                         req->valid = 1;
 906
 907                         writel(BIT(DMA_ENABLE), &dma->dmactl);
 908                         writel(BIT(DMA_START), &dma->dmastat);
 909                         return;
 910                 }
 911                 stop_out_naking(ep);
 912         }
 913
 914         tmp = dmactl_default;
 915
 916         /* force packet boundaries between dma requests, but prevent the
 917          * controller from automagically writing a last "short" packet
 918          * (zero length) unless the driver explicitly said to do that.
 919          */
 920         if (ep->is_in) {
 921                 if (likely((req->req.length % ep->ep.maxpacket) ||
 922                                                         req->req.zero)){
 923                         tmp |= BIT(DMA_FIFO_VALIDATE);
 924                         ep->in_fifo_validate = 1;
 925                 } else
 926                         ep->in_fifo_validate = 0;
 927         }
 928
 929         /* init req->td, pointing to the current dummy */
 930         req->td->dmadesc = cpu_to_le32 (ep->td_dma);
 931         fill_dma_desc(ep, req, 1);
 932
 933         req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
 934
 935         start_queue(ep, tmp, req->td_dma);
 936 }
 937
 938 static inline void
 939 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
 940 {
 941         struct net2280_dma      *end;
 942         dma_addr_t              tmp;
 943
 944         /* swap new dummy for old, link; fill and maybe activate */
 945         end = ep->dummy;
 946         ep->dummy = req->td;
 947         req->td = end;
 948
 949         tmp = ep->td_dma;
 950         ep->td_dma = req->td_dma;
 951         req->td_dma = tmp;
 952
 953         end->dmadesc = cpu_to_le32 (ep->td_dma);
 954
 955         fill_dma_desc(ep, req, valid);
 956 }
 957
 958 static void
 959 done(struct net2280_ep *ep, struct net2280_request *req, int status)
 960 {
 961         struct net2280          *dev;
 962         unsigned                stopped = ep->stopped;
 963
 964         list_del_init(&req->queue);
 965
 966         if (req->req.status == -EINPROGRESS)
 967                 req->req.status = status;
 968         else
 969                 status = req->req.status;
 970
 971         dev = ep->dev;
 972         if (ep->dma)
 973                 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
 974
 975         if (status && status != -ESHUTDOWN)
 976                 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
 977                         ep->ep.name, &req->req, status,
 978                         req->req.actual, req->req.length);
 979
 980         /* don't modify queue heads during completion callback */
 981         ep->stopped = 1;
 982         spin_unlock(&dev->lock);
 983         usb_gadget_giveback_request(&ep->ep, &req->req);
 984         spin_lock(&dev->lock);
 985         ep->stopped = stopped;
 986 }
 987
 988 /*-------------------------------------------------------------------------*/
 989
 990 static int
 991 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 992 {
 993         struct net2280_request  *req;
 994         struct net2280_ep       *ep;
 995         struct net2280          *dev;
 996         unsigned long           flags;
 997         int ret = 0;
 998
 999         /* we always require a cpu-view buffer, so that we can
1000          * always use pio (as fallback or whatever).
1001          */
1002         ep = container_of(_ep, struct net2280_ep, ep);
1003         if (!_ep || (!ep->desc && ep->num != 0)) {
1004                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1005                 return -EINVAL;
1006         }
1007         req = container_of(_req, struct net2280_request, req);
1008         if (!_req || !_req->complete || !_req->buf ||
1009                                 !list_empty(&req->queue)) {
1010                 ret = -EINVAL;
1011                 goto print_err;
1012         }
1013         if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
1014                 ret = -EDOM;
1015                 goto print_err;
1016         }
1017         dev = ep->dev;
1018         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1019                 ret = -ESHUTDOWN;
1020                 goto print_err;
1021         }
1022
1023         /* FIXME implement PIO fallback for ZLPs with DMA */
1024         if (ep->dma && _req->length == 0) {
1025                 ret = -EOPNOTSUPP;
1026                 goto print_err;
1027         }
1028
1029         /* set up dma mapping in case the caller didn't */
1030         if (ep->dma) {
1031                 ret = usb_gadget_map_request(&dev->gadget, _req,
1032                                 ep->is_in);
1033                 if (ret)
1034                         goto print_err;
1035         }
1036
1037         ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
1038                         _ep->name, _req, _req->length, _req->buf);
1039
1040         spin_lock_irqsave(&dev->lock, flags);
1041
1042         _req->status = -EINPROGRESS;
1043         _req->actual = 0;
1044
1045         /* kickstart this i/o queue? */
1046         if  (list_empty(&ep->queue) && !ep->stopped &&
1047                 !((dev->quirks & PLX_PCIE) && ep->dma &&
1048                   (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1049
1050                 /* use DMA if the endpoint supports it, else pio */
1051                 if (ep->dma)
1052                         start_dma(ep, req);
1053                 else {
1054                         /* maybe there's no control data, just status ack */
1055                         if (ep->num == 0 && _req->length == 0) {
1056                                 allow_status(ep);
1057                                 done(ep, req, 0);
1058                                 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1059                                 goto done;
1060                         }
1061
1062                         /* PIO ... stuff the fifo, or unblock it.  */
1063                         if (ep->is_in)
1064                                 write_fifo(ep, _req);
1065                         else if (list_empty(&ep->queue)) {
1066                                 u32     s;
1067
1068                                 /* OUT FIFO might have packet(s) buffered */
1069                                 s = readl(&ep->regs->ep_stat);
1070                                 if ((s & BIT(FIFO_EMPTY)) == 0) {
1071                                         /* note:  _req->short_not_ok is
1072                                          * ignored here since PIO _always_
1073                                          * stops queue advance here, and
1074                                          * _req->status doesn't change for
1075                                          * short reads (only _req->actual)
1076                                          */
1077                                         if (read_fifo(ep, req) &&
1078                                                         ep->num == 0) {
1079                                                 done(ep, req, 0);
1080                                                 allow_status(ep);
1081                                                 /* don't queue it */
1082                                                 req = NULL;
1083                                         } else if (read_fifo(ep, req) &&
1084                                                         ep->num != 0) {
1085                                                 done(ep, req, 0);
1086                                                 req = NULL;
1087                                         } else
1088                                                 s = readl(&ep->regs->ep_stat);
1089                                 }
1090
1091                                 /* don't NAK, let the fifo fill */
1092                                 if (req && (s & BIT(NAK_OUT_PACKETS)))
1093                                         writel(BIT(CLEAR_NAK_OUT_PACKETS),
1094                                                         &ep->regs->ep_rsp);
1095                         }
1096                 }
1097
1098         } else if (ep->dma) {
1099                 int     valid = 1;
1100
1101                 if (ep->is_in) {
1102                         int     expect;
1103
1104                         /* preventing magic zlps is per-engine state, not
1105                          * per-transfer; irq logic must recover hiccups.
1106                          */
1107                         expect = likely(req->req.zero ||
1108                                 (req->req.length % ep->ep.maxpacket));
1109                         if (expect != ep->in_fifo_validate)
1110                                 valid = 0;
1111                 }
1112                 queue_dma(ep, req, valid);
1113
1114         } /* else the irq handler advances the queue. */
1115
1116         ep->responded = 1;
1117         if (req)
1118                 list_add_tail(&req->queue, &ep->queue);
1119 done:
1120         spin_unlock_irqrestore(&dev->lock, flags);
1121
1122         /* pci writes may still be posted */
1123         return ret;
1124
1125 print_err:
1126         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1127         return ret;
1128 }
1129
1130 static inline void
1131 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1132                 int status)
1133 {
1134         req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1135         done(ep, req, status);
1136 }
1137
1138 static int scan_dma_completions(struct net2280_ep *ep)
1139 {
1140         int num_completed = 0;
1141
1142         /* only look at descriptors that were "naturally" retired,
1143          * so fifo and list head state won't matter
1144          */
1145         while (!list_empty(&ep->queue)) {
1146                 struct net2280_request  *req;
1147                 u32 req_dma_count;
1148
1149                 req = list_entry(ep->queue.next,
1150                                 struct net2280_request, queue);
1151                 if (!req->valid)
1152                         break;
1153                 rmb();
1154                 req_dma_count = le32_to_cpup(&req->td->dmacount);
1155                 if ((req_dma_count & BIT(VALID_BIT)) != 0)
1156                         break;
1157
1158                 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1159                  * cases where DMA must be aborted; this code handles
1160                  * all non-abort DMA completions.
1161                  */
1162                 if (unlikely(req->td->dmadesc == 0)) {
1163                         /* paranoia */
1164                         u32 const ep_dmacount = readl(&ep->dma->dmacount);
1165
1166                         if (ep_dmacount & DMA_BYTE_COUNT_MASK)
1167                                 break;
1168                         /* single transfer mode */
1169                         dma_done(ep, req, req_dma_count, 0);
1170                         num_completed++;
1171                         break;
1172                 } else if (!ep->is_in &&
1173                            (req->req.length % ep->ep.maxpacket) &&
1174                            !(ep->dev->quirks & PLX_PCIE)) {
1175
1176                         u32 const ep_stat = readl(&ep->regs->ep_stat);
1177                         /* AVOID TROUBLE HERE by not issuing short reads from
1178                          * your gadget driver.  That helps avoids errata 0121,
1179                          * 0122, and 0124; not all cases trigger the warning.
1180                          */
1181                         if ((ep_stat & BIT(NAK_OUT_PACKETS)) == 0) {
1182                                 ep_warn(ep->dev, "%s lost packet sync!\n",
1183                                                 ep->ep.name);
1184                                 req->req.status = -EOVERFLOW;
1185                         } else {
1186                                 u32 const ep_avail = readl(&ep->regs->ep_avail);
1187                                 if (ep_avail) {
1188                                         /* fifo gets flushed later */
1189                                         ep->out_overflow = 1;
1190                                         ep_dbg(ep->dev,
1191                                                 "%s dma, discard %d len %d\n",
1192                                                 ep->ep.name, ep_avail,
1193                                                 req->req.length);
1194                                         req->req.status = -EOVERFLOW;
1195                                 }
1196                         }
1197                 }
1198                 dma_done(ep, req, req_dma_count, 0);
1199                 num_completed++;
1200         }
1201
1202         return num_completed;
1203 }
1204
1205 static void restart_dma(struct net2280_ep *ep)
1206 {
1207         struct net2280_request  *req;
1208
1209         if (ep->stopped)
1210                 return;
1211         req = list_entry(ep->queue.next, struct net2280_request, queue);
1212
1213         start_dma(ep, req);
1214 }
1215
1216 static void abort_dma(struct net2280_ep *ep)
1217 {
1218         /* abort the current transfer */
1219         if (likely(!list_empty(&ep->queue))) {
1220                 /* FIXME work around errata 0121, 0122, 0124 */
1221                 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1222                 spin_stop_dma(ep->dma);
1223         } else
1224                 stop_dma(ep->dma);
1225         scan_dma_completions(ep);
1226 }
1227
1228 /* dequeue ALL requests */
1229 static void nuke(struct net2280_ep *ep)
1230 {
1231         struct net2280_request  *req;
1232
1233         /* called with spinlock held */
1234         ep->stopped = 1;
1235         if (ep->dma)
1236                 abort_dma(ep);
1237         while (!list_empty(&ep->queue)) {
1238                 req = list_entry(ep->queue.next,
1239                                 struct net2280_request,
1240                                 queue);
1241                 done(ep, req, -ESHUTDOWN);
1242         }
1243 }
1244
1245 /* dequeue JUST ONE request */
1246 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1247 {
1248         struct net2280_ep       *ep;
1249         struct net2280_request  *req;
1250         unsigned long           flags;
1251         u32                     dmactl;
1252         int                     stopped;
1253
1254         ep = container_of(_ep, struct net2280_ep, ep);
1255         if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1256                 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1257                                                 __func__, _ep, _req);
1258                 return -EINVAL;
1259         }
1260
1261         spin_lock_irqsave(&ep->dev->lock, flags);
1262         stopped = ep->stopped;
1263
1264         /* quiesce dma while we patch the queue */
1265         dmactl = 0;
1266         ep->stopped = 1;
1267         if (ep->dma) {
1268                 dmactl = readl(&ep->dma->dmactl);
1269                 /* WARNING erratum 0127 may kick in ... */
1270                 stop_dma(ep->dma);
1271                 scan_dma_completions(ep);
1272         }
1273
1274         /* make sure it's still queued on this endpoint */
1275         list_for_each_entry(req, &ep->queue, queue) {
1276                 if (&req->req == _req)
1277                         break;
1278         }
1279         if (&req->req != _req) {
1280                 ep->stopped = stopped;
1281                 spin_unlock_irqrestore(&ep->dev->lock, flags);
1282                 ep_dbg(ep->dev, "%s: Request mismatch\n", __func__);
1283                 return -EINVAL;
1284         }
1285
1286         /* queue head may be partially complete. */
1287         if (ep->queue.next == &req->queue) {
1288                 if (ep->dma) {
1289                         ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1290                         _req->status = -ECONNRESET;
1291                         abort_dma(ep);
1292                         if (likely(ep->queue.next == &req->queue)) {
1293                                 /* NOTE: misreports single-transfer mode*/
1294                                 req->td->dmacount = 0;  /* invalidate */
1295                                 dma_done(ep, req,
1296                                         readl(&ep->dma->dmacount),
1297                                         -ECONNRESET);
1298                         }
1299                 } else {
1300                         ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1301                         done(ep, req, -ECONNRESET);
1302                 }
1303                 req = NULL;
1304         }
1305
1306         if (req)
1307                 done(ep, req, -ECONNRESET);
1308         ep->stopped = stopped;
1309
1310         if (ep->dma) {
1311                 /* turn off dma on inactive queues */
1312                 if (list_empty(&ep->queue))
1313                         stop_dma(ep->dma);
1314                 else if (!ep->stopped) {
1315                         /* resume current request, or start new one */
1316                         if (req)
1317                                 writel(dmactl, &ep->dma->dmactl);
1318                         else
1319                                 start_dma(ep, list_entry(ep->queue.next,
1320                                         struct net2280_request, queue));
1321                 }
1322         }
1323
1324         spin_unlock_irqrestore(&ep->dev->lock, flags);
1325         return 0;
1326 }
1327
1328 /*-------------------------------------------------------------------------*/
1329
1330 static int net2280_fifo_status(struct usb_ep *_ep);
1331
1332 static int
1333 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1334 {
1335         struct net2280_ep       *ep;
1336         unsigned long           flags;
1337         int                     retval = 0;
1338
1339         ep = container_of(_ep, struct net2280_ep, ep);
1340         if (!_ep || (!ep->desc && ep->num != 0)) {
1341                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1342                 return -EINVAL;
1343         }
1344         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1345                 retval = -ESHUTDOWN;
1346                 goto print_err;
1347         }
1348         if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1349                                                 == USB_ENDPOINT_XFER_ISOC) {
1350                 retval = -EINVAL;
1351                 goto print_err;
1352         }
1353
1354         spin_lock_irqsave(&ep->dev->lock, flags);
1355         if (!list_empty(&ep->queue)) {
1356                 retval = -EAGAIN;
1357                 goto print_unlock;
1358         } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1359                 retval = -EAGAIN;
1360                 goto print_unlock;
1361         } else {
1362                 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1363                                 value ? "set" : "clear",
1364                                 wedged ? "wedge" : "halt");
1365                 /* set/clear, then synch memory views with the device */
1366                 if (value) {
1367                         if (ep->num == 0)
1368                                 ep->dev->protocol_stall = 1;
1369                         else
1370                                 set_halt(ep);
1371                         if (wedged)
1372                                 ep->wedged = 1;
1373                 } else {
1374                         clear_halt(ep);
1375                         if (ep->dev->quirks & PLX_PCIE &&
1376                                 !list_empty(&ep->queue) && ep->td_dma)
1377                                         restart_dma(ep);
1378                         ep->wedged = 0;
1379                 }
1380                 (void) readl(&ep->regs->ep_rsp);
1381         }
1382         spin_unlock_irqrestore(&ep->dev->lock, flags);
1383
1384         return retval;
1385
1386 print_unlock:
1387         spin_unlock_irqrestore(&ep->dev->lock, flags);
1388 print_err:
1389         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1390         return retval;
1391 }
1392
1393 static int net2280_set_halt(struct usb_ep *_ep, int value)
1394 {
1395         return net2280_set_halt_and_wedge(_ep, value, 0);
1396 }
1397
1398 static int net2280_set_wedge(struct usb_ep *_ep)
1399 {
1400         if (!_ep || _ep->name == ep0name) {
1401                 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1402                 return -EINVAL;
1403         }
1404         return net2280_set_halt_and_wedge(_ep, 1, 1);
1405 }
1406
1407 static int net2280_fifo_status(struct usb_ep *_ep)
1408 {
1409         struct net2280_ep       *ep;
1410         u32                     avail;
1411
1412         ep = container_of(_ep, struct net2280_ep, ep);
1413         if (!_ep || (!ep->desc && ep->num != 0)) {
1414                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1415                 return -ENODEV;
1416         }
1417         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1418                 dev_err(&ep->dev->pdev->dev,
1419                         "%s: Invalid driver=%p or speed=%d\n",
1420                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1421                 return -ESHUTDOWN;
1422         }
1423
1424         avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1425         if (avail > ep->fifo_size) {
1426                 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1427                 return -EOVERFLOW;
1428         }
1429         if (ep->is_in)
1430                 avail = ep->fifo_size - avail;
1431         return avail;
1432 }
1433
1434 static void net2280_fifo_flush(struct usb_ep *_ep)
1435 {
1436         struct net2280_ep       *ep;
1437
1438         ep = container_of(_ep, struct net2280_ep, ep);
1439         if (!_ep || (!ep->desc && ep->num != 0)) {
1440                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1441                 return;
1442         }
1443         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1444                 dev_err(&ep->dev->pdev->dev,
1445                         "%s: Invalid driver=%p or speed=%d\n",
1446                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1447                 return;
1448         }
1449
1450         writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1451         (void) readl(&ep->regs->ep_rsp);
1452 }
1453
1454 static const struct usb_ep_ops net2280_ep_ops = {
1455         .enable         = net2280_enable,
1456         .disable        = net2280_disable,
1457
1458         .alloc_request  = net2280_alloc_request,
1459         .free_request   = net2280_free_request,
1460
1461         .queue          = net2280_queue,
1462         .dequeue        = net2280_dequeue,
1463
1464         .set_halt       = net2280_set_halt,
1465         .set_wedge      = net2280_set_wedge,
1466         .fifo_status    = net2280_fifo_status,
1467         .fifo_flush     = net2280_fifo_flush,
1468 };
1469
1470 /*-------------------------------------------------------------------------*/
1471
1472 static int net2280_get_frame(struct usb_gadget *_gadget)
1473 {
1474         struct net2280          *dev;
1475         unsigned long           flags;
1476         u16                     retval;
1477
1478         if (!_gadget)
1479                 return -ENODEV;
1480         dev = container_of(_gadget, struct net2280, gadget);
1481         spin_lock_irqsave(&dev->lock, flags);
1482         retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1483         spin_unlock_irqrestore(&dev->lock, flags);
1484         return retval;
1485 }
1486
1487 static int net2280_wakeup(struct usb_gadget *_gadget)
1488 {
1489         struct net2280          *dev;
1490         u32                     tmp;
1491         unsigned long           flags;
1492
1493         if (!_gadget)
1494                 return 0;
1495         dev = container_of(_gadget, struct net2280, gadget);
1496
1497         spin_lock_irqsave(&dev->lock, flags);
1498         tmp = readl(&dev->usb->usbctl);
1499         if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1500                 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1501         spin_unlock_irqrestore(&dev->lock, flags);
1502
1503         /* pci writes may still be posted */
1504         return 0;
1505 }
1506
1507 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1508 {
1509         struct net2280          *dev;
1510         u32                     tmp;
1511         unsigned long           flags;
1512
1513         if (!_gadget)
1514                 return 0;
1515         dev = container_of(_gadget, struct net2280, gadget);
1516
1517         spin_lock_irqsave(&dev->lock, flags);
1518         tmp = readl(&dev->usb->usbctl);
1519         if (value) {
1520                 tmp |= BIT(SELF_POWERED_STATUS);
1521                 _gadget->is_selfpowered = 1;
1522         } else {
1523                 tmp &= ~BIT(SELF_POWERED_STATUS);
1524                 _gadget->is_selfpowered = 0;
1525         }
1526         writel(tmp, &dev->usb->usbctl);
1527         spin_unlock_irqrestore(&dev->lock, flags);
1528
1529         return 0;
1530 }
1531
1532 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1533 {
1534         struct net2280  *dev;
1535         u32             tmp;
1536         unsigned long   flags;
1537
1538         if (!_gadget)
1539                 return -ENODEV;
1540         dev = container_of(_gadget, struct net2280, gadget);
1541
1542         spin_lock_irqsave(&dev->lock, flags);
1543         tmp = readl(&dev->usb->usbctl);
1544         dev->softconnect = (is_on != 0);
1545         if (is_on) {
1546                 ep0_start(dev);
1547                 writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1548         } else {
1549                 writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1550                 stop_activity(dev, NULL);
1551         }
1552
1553         spin_unlock_irqrestore(&dev->lock, flags);
1554
1555         if (!is_on && dev->driver)
1556                 dev->driver->disconnect(&dev->gadget);
1557
1558         return 0;
1559 }
1560
1561 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1562                 struct usb_endpoint_descriptor *desc,
1563                 struct usb_ss_ep_comp_descriptor *ep_comp)
1564 {
1565         char name[8];
1566         struct usb_ep *ep;
1567
1568         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1569                 /* ep-e, ep-f are PIO with only 64 byte fifos */
1570                 ep = gadget_find_ep_by_name(_gadget, "ep-e");
1571                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1572                         return ep;
1573                 ep = gadget_find_ep_by_name(_gadget, "ep-f");
1574                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1575                         return ep;
1576         }
1577
1578         /* USB3380: Only first four endpoints have DMA channels. Allocate
1579          * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc
1580          * endpoints use DMA hw endpoints.
1581          */
1582         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1583             usb_endpoint_dir_in(desc)) {
1584                 ep = gadget_find_ep_by_name(_gadget, "ep2in");
1585                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1586                         return ep;
1587                 ep = gadget_find_ep_by_name(_gadget, "ep4in");
1588                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1589                         return ep;
1590         } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1591                    !usb_endpoint_dir_in(desc)) {
1592                 ep = gadget_find_ep_by_name(_gadget, "ep1out");
1593                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1594                         return ep;
1595                 ep = gadget_find_ep_by_name(_gadget, "ep3out");
1596                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1597                         return ep;
1598         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1599                    usb_endpoint_dir_in(desc)) {
1600                 ep = gadget_find_ep_by_name(_gadget, "ep1in");
1601                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1602                         return ep;
1603                 ep = gadget_find_ep_by_name(_gadget, "ep3in");
1604                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1605                         return ep;
1606         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1607                    !usb_endpoint_dir_in(desc)) {
1608                 ep = gadget_find_ep_by_name(_gadget, "ep2out");
1609                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1610                         return ep;
1611                 ep = gadget_find_ep_by_name(_gadget, "ep4out");
1612                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1613                         return ep;
1614         }
1615
1616         /* USB3380: use same address for usb and hardware endpoints */
1617         snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1618                         usb_endpoint_dir_in(desc) ? "in" : "out");
1619         ep = gadget_find_ep_by_name(_gadget, name);
1620         if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1621                 return ep;
1622
1623         return NULL;
1624 }
1625
1626 static int net2280_start(struct usb_gadget *_gadget,
1627                 struct usb_gadget_driver *driver);
1628 static int net2280_stop(struct usb_gadget *_gadget);
1629
1630 static const struct usb_gadget_ops net2280_ops = {
1631         .get_frame      = net2280_get_frame,
1632         .wakeup         = net2280_wakeup,
1633         .set_selfpowered = net2280_set_selfpowered,
1634         .pullup         = net2280_pullup,
1635         .udc_start      = net2280_start,
1636         .udc_stop       = net2280_stop,
1637         .match_ep       = net2280_match_ep,
1638 };
1639
1640 /*-------------------------------------------------------------------------*/
1641
1642 #ifdef  CONFIG_USB_GADGET_DEBUG_FILES
1643
1644 /* FIXME move these into procfs, and use seq_file.
1645  * Sysfs _still_ doesn't behave for arbitrarily sized files,
1646  * and also doesn't help products using this with 2.4 kernels.
1647  */
1648
1649 /* "function" sysfs attribute */
1650 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1651                              char *buf)
1652 {
1653         struct net2280  *dev = dev_get_drvdata(_dev);
1654
1655         if (!dev->driver || !dev->driver->function ||
1656                         strlen(dev->driver->function) > PAGE_SIZE)
1657                 return 0;
1658         return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1659 }
1660 static DEVICE_ATTR_RO(function);
1661
1662 static ssize_t registers_show(struct device *_dev,
1663                               struct device_attribute *attr, char *buf)
1664 {
1665         struct net2280          *dev;
1666         char                    *next;
1667         unsigned                size, t;
1668         unsigned long           flags;
1669         int                     i;
1670         u32                     t1, t2;
1671         const char              *s;
1672
1673         dev = dev_get_drvdata(_dev);
1674         next = buf;
1675         size = PAGE_SIZE;
1676         spin_lock_irqsave(&dev->lock, flags);
1677
1678         if (dev->driver)
1679                 s = dev->driver->driver.name;
1680         else
1681                 s = "(none)";
1682
1683         /* Main Control Registers */
1684         t = scnprintf(next, size, "%s version " DRIVER_VERSION
1685                         ", chiprev %04x\n\n"
1686                         "devinit %03x fifoctl %08x gadget '%s'\n"
1687                         "pci irqenb0 %02x irqenb1 %08x "
1688                         "irqstat0 %04x irqstat1 %08x\n",
1689                         driver_name, dev->chiprev,
1690                         readl(&dev->regs->devinit),
1691                         readl(&dev->regs->fifoctl),
1692                         s,
1693                         readl(&dev->regs->pciirqenb0),
1694                         readl(&dev->regs->pciirqenb1),
1695                         readl(&dev->regs->irqstat0),
1696                         readl(&dev->regs->irqstat1));
1697         size -= t;
1698         next += t;
1699
1700         /* USB Control Registers */
1701         t1 = readl(&dev->usb->usbctl);
1702         t2 = readl(&dev->usb->usbstat);
1703         if (t1 & BIT(VBUS_PIN)) {
1704                 if (t2 & BIT(HIGH_SPEED))
1705                         s = "high speed";
1706                 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1707                         s = "powered";
1708                 else
1709                         s = "full speed";
1710                 /* full speed bit (6) not working?? */
1711         } else
1712                         s = "not attached";
1713         t = scnprintf(next, size,
1714                         "stdrsp %08x usbctl %08x usbstat %08x "
1715                                 "addr 0x%02x (%s)\n",
1716                         readl(&dev->usb->stdrsp), t1, t2,
1717                         readl(&dev->usb->ouraddr), s);
1718         size -= t;
1719         next += t;
1720
1721         /* PCI Master Control Registers */
1722
1723         /* DMA Control Registers */
1724
1725         /* Configurable EP Control Registers */
1726         for (i = 0; i < dev->n_ep; i++) {
1727                 struct net2280_ep       *ep;
1728
1729                 ep = &dev->ep[i];
1730                 if (i && !ep->desc)
1731                         continue;
1732
1733                 t1 = readl(&ep->cfg->ep_cfg);
1734                 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1735                 t = scnprintf(next, size,
1736                                 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1737                                         "irqenb %02x\n",
1738                                 ep->ep.name, t1, t2,
1739                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1740                                         ? "NAK " : "",
1741                                 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1742                                         ? "hide " : "",
1743                                 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1744                                         ? "CRC " : "",
1745                                 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1746                                         ? "interrupt " : "",
1747                                 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1748                                         ? "status " : "",
1749                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1750                                         ? "NAKmode " : "",
1751                                 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1752                                         ? "DATA1 " : "DATA0 ",
1753                                 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1754                                         ? "HALT " : "",
1755                                 readl(&ep->regs->ep_irqenb));
1756                 size -= t;
1757                 next += t;
1758
1759                 t = scnprintf(next, size,
1760                                 "\tstat %08x avail %04x "
1761                                 "(ep%d%s-%s)%s\n",
1762                                 readl(&ep->regs->ep_stat),
1763                                 readl(&ep->regs->ep_avail),
1764                                 t1 & 0x0f, DIR_STRING(t1),
1765                                 type_string(t1 >> 8),
1766                                 ep->stopped ? "*" : "");
1767                 size -= t;
1768                 next += t;
1769
1770                 if (!ep->dma)
1771                         continue;
1772
1773                 t = scnprintf(next, size,
1774                                 "  dma\tctl %08x stat %08x count %08x\n"
1775                                 "\taddr %08x desc %08x\n",
1776                                 readl(&ep->dma->dmactl),
1777                                 readl(&ep->dma->dmastat),
1778                                 readl(&ep->dma->dmacount),
1779                                 readl(&ep->dma->dmaaddr),
1780                                 readl(&ep->dma->dmadesc));
1781                 size -= t;
1782                 next += t;
1783
1784         }
1785
1786         /* Indexed Registers (none yet) */
1787
1788         /* Statistics */
1789         t = scnprintf(next, size, "\nirqs:  ");
1790         size -= t;
1791         next += t;
1792         for (i = 0; i < dev->n_ep; i++) {
1793                 struct net2280_ep       *ep;
1794
1795                 ep = &dev->ep[i];
1796                 if (i && !ep->irqs)
1797                         continue;
1798                 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1799                 size -= t;
1800                 next += t;
1801
1802         }
1803         t = scnprintf(next, size, "\n");
1804         size -= t;
1805         next += t;
1806
1807         spin_unlock_irqrestore(&dev->lock, flags);
1808
1809         return PAGE_SIZE - size;
1810 }
1811 static DEVICE_ATTR_RO(registers);
1812
1813 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1814                            char *buf)
1815 {
1816         struct net2280          *dev;
1817         char                    *next;
1818         unsigned                size;
1819         unsigned long           flags;
1820         int                     i;
1821
1822         dev = dev_get_drvdata(_dev);
1823         next = buf;
1824         size = PAGE_SIZE;
1825         spin_lock_irqsave(&dev->lock, flags);
1826
1827         for (i = 0; i < dev->n_ep; i++) {
1828                 struct net2280_ep               *ep = &dev->ep[i];
1829                 struct net2280_request          *req;
1830                 int                             t;
1831
1832                 if (i != 0) {
1833                         const struct usb_endpoint_descriptor    *d;
1834
1835                         d = ep->desc;
1836                         if (!d)
1837                                 continue;
1838                         t = d->bEndpointAddress;
1839                         t = scnprintf(next, size,
1840                                 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1841                                 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1842                                 (t & USB_DIR_IN) ? "in" : "out",
1843                                 type_string(d->bmAttributes),
1844                                 usb_endpoint_maxp(d),
1845                                 ep->dma ? "dma" : "pio", ep->fifo_size
1846                                 );
1847                 } else /* ep0 should only have one transfer queued */
1848                         t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1849                                         ep->is_in ? "in" : "out");
1850                 if (t <= 0 || t > size)
1851                         goto done;
1852                 size -= t;
1853                 next += t;
1854
1855                 if (list_empty(&ep->queue)) {
1856                         t = scnprintf(next, size, "\t(nothing queued)\n");
1857                         if (t <= 0 || t > size)
1858                                 goto done;
1859                         size -= t;
1860                         next += t;
1861                         continue;
1862                 }
1863                 list_for_each_entry(req, &ep->queue, queue) {
1864                         if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1865                                 t = scnprintf(next, size,
1866                                         "\treq %p len %d/%d "
1867                                         "buf %p (dmacount %08x)\n",
1868                                         &req->req, req->req.actual,
1869                                         req->req.length, req->req.buf,
1870                                         readl(&ep->dma->dmacount));
1871                         else
1872                                 t = scnprintf(next, size,
1873                                         "\treq %p len %d/%d buf %p\n",
1874                                         &req->req, req->req.actual,
1875                                         req->req.length, req->req.buf);
1876                         if (t <= 0 || t > size)
1877                                 goto done;
1878                         size -= t;
1879                         next += t;
1880
1881                         if (ep->dma) {
1882                                 struct net2280_dma      *td;
1883
1884                                 td = req->td;
1885                                 t = scnprintf(next, size, "\t    td %08x "
1886                                         " count %08x buf %08x desc %08x\n",
1887                                         (u32) req->td_dma,
1888                                         le32_to_cpu(td->dmacount),
1889                                         le32_to_cpu(td->dmaaddr),
1890                                         le32_to_cpu(td->dmadesc));
1891                                 if (t <= 0 || t > size)
1892                                         goto done;
1893                                 size -= t;
1894                                 next += t;
1895                         }
1896                 }
1897         }
1898
1899 done:
1900         spin_unlock_irqrestore(&dev->lock, flags);
1901         return PAGE_SIZE - size;
1902 }
1903 static DEVICE_ATTR_RO(queues);
1904
1905
1906 #else
1907
1908 #define device_create_file(a, b)        (0)
1909 #define device_remove_file(a, b)        do { } while (0)
1910
1911 #endif
1912
1913 /*-------------------------------------------------------------------------*/
1914
1915 /* another driver-specific mode might be a request type doing dma
1916  * to/from another device fifo instead of to/from memory.
1917  */
1918
1919 static void set_fifo_mode(struct net2280 *dev, int mode)
1920 {
1921         /* keeping high bits preserves BAR2 */
1922         writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1923
1924         /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1925         INIT_LIST_HEAD(&dev->gadget.ep_list);
1926         list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1927         list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1928         switch (mode) {
1929         case 0:
1930                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1931                 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1932                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1933                 break;
1934         case 1:
1935                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1936                 break;
1937         case 2:
1938                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1939                 dev->ep[1].fifo_size = 2048;
1940                 dev->ep[2].fifo_size = 1024;
1941                 break;
1942         }
1943         /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1944         list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1945         list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1946 }
1947
1948 static void defect7374_disable_data_eps(struct net2280 *dev)
1949 {
1950         /*
1951          * For Defect 7374, disable data EPs (and more):
1952          *  - This phase undoes the earlier phase of the Defect 7374 workaround,
1953          *    returing ep regs back to normal.
1954          */
1955         struct net2280_ep *ep;
1956         int i;
1957         unsigned char ep_sel;
1958         u32 tmp_reg;
1959
1960         for (i = 1; i < 5; i++) {
1961                 ep = &dev->ep[i];
1962                 writel(i, &ep->cfg->ep_cfg);
1963         }
1964
1965         /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1966         for (i = 0; i < 6; i++)
1967                 writel(0, &dev->dep[i].dep_cfg);
1968
1969         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1970                 /* Select an endpoint for subsequent operations: */
1971                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1972                 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1973
1974                 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1975                                         ep_sel == 18 || ep_sel == 20)
1976                         continue;
1977
1978                 /* Change settings on some selected endpoints */
1979                 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1980                 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1981                 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1982                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1983                 tmp_reg |= BIT(EP_INITIALIZED);
1984                 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1985         }
1986 }
1987
1988 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1989 {
1990         u32 tmp = 0, tmp_reg;
1991         u32 scratch;
1992         int i;
1993         unsigned char ep_sel;
1994
1995         scratch = get_idx_reg(dev->regs, SCRATCH);
1996
1997         WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1998                 == DEFECT7374_FSM_SS_CONTROL_READ);
1999
2000         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2001
2002         ep_warn(dev, "Operate Defect 7374 workaround soft this time");
2003         ep_warn(dev, "It will operate on cold-reboot and SS connect");
2004
2005         /*GPEPs:*/
2006         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
2007                         (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
2008                         ((dev->enhanced_mode) ?
2009                          BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
2010                          BIT(ENDPOINT_ENABLE)));
2011
2012         for (i = 1; i < 5; i++)
2013                 writel(tmp, &dev->ep[i].cfg->ep_cfg);
2014
2015         /* CSRIN, PCIIN, STATIN, RCIN*/
2016         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
2017         writel(tmp, &dev->dep[1].dep_cfg);
2018         writel(tmp, &dev->dep[3].dep_cfg);
2019         writel(tmp, &dev->dep[4].dep_cfg);
2020         writel(tmp, &dev->dep[5].dep_cfg);
2021
2022         /*Implemented for development and debug.
2023          * Can be refined/tuned later.*/
2024         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
2025                 /* Select an endpoint for subsequent operations: */
2026                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
2027                 writel(((tmp_reg & ~0x1f) | ep_sel),
2028                                 &dev->plregs->pl_ep_ctrl);
2029
2030                 if (ep_sel == 1) {
2031                         tmp =
2032                                 (readl(&dev->plregs->pl_ep_ctrl) |
2033                                  BIT(CLEAR_ACK_ERROR_CODE) | 0);
2034                         writel(tmp, &dev->plregs->pl_ep_ctrl);
2035                         continue;
2036                 }
2037
2038                 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
2039                                 ep_sel == 18  || ep_sel == 20)
2040                         continue;
2041
2042                 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
2043                                 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
2044                 writel(tmp, &dev->plregs->pl_ep_cfg_4);
2045
2046                 tmp = readl(&dev->plregs->pl_ep_ctrl) &
2047                         ~BIT(EP_INITIALIZED);
2048                 writel(tmp, &dev->plregs->pl_ep_ctrl);
2049
2050         }
2051
2052         /* Set FSM to focus on the first Control Read:
2053          * - Tip: Connection speed is known upon the first
2054          * setup request.*/
2055         scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2056         set_idx_reg(dev->regs, SCRATCH, scratch);
2057
2058 }
2059
2060 /* keeping it simple:
2061  * - one bus driver, initted first;
2062  * - one function driver, initted second
2063  *
2064  * most of the work to support multiple net2280 controllers would
2065  * be to associate this gadget driver (yes?) with all of them, or
2066  * perhaps to bind specific drivers to specific devices.
2067  */
2068
2069 static void usb_reset_228x(struct net2280 *dev)
2070 {
2071         u32     tmp;
2072
2073         dev->gadget.speed = USB_SPEED_UNKNOWN;
2074         (void) readl(&dev->usb->usbctl);
2075
2076         net2280_led_init(dev);
2077
2078         /* disable automatic responses, and irqs */
2079         writel(0, &dev->usb->stdrsp);
2080         writel(0, &dev->regs->pciirqenb0);
2081         writel(0, &dev->regs->pciirqenb1);
2082
2083         /* clear old dma and irq state */
2084         for (tmp = 0; tmp < 4; tmp++) {
2085                 struct net2280_ep       *ep = &dev->ep[tmp + 1];
2086                 if (ep->dma)
2087                         abort_dma(ep);
2088         }
2089
2090         writel(~0, &dev->regs->irqstat0),
2091         writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2092
2093         /* reset, and enable pci */
2094         tmp = readl(&dev->regs->devinit) |
2095                 BIT(PCI_ENABLE) |
2096                 BIT(FIFO_SOFT_RESET) |
2097                 BIT(USB_SOFT_RESET) |
2098                 BIT(M8051_RESET);
2099         writel(tmp, &dev->regs->devinit);
2100
2101         /* standard fifo and endpoint allocations */
2102         set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2103 }
2104
2105 static void usb_reset_338x(struct net2280 *dev)
2106 {
2107         u32 tmp;
2108
2109         dev->gadget.speed = USB_SPEED_UNKNOWN;
2110         (void)readl(&dev->usb->usbctl);
2111
2112         net2280_led_init(dev);
2113
2114         if (dev->bug7734_patched) {
2115                 /* disable automatic responses, and irqs */
2116                 writel(0, &dev->usb->stdrsp);
2117                 writel(0, &dev->regs->pciirqenb0);
2118                 writel(0, &dev->regs->pciirqenb1);
2119         }
2120
2121         /* clear old dma and irq state */
2122         for (tmp = 0; tmp < 4; tmp++) {
2123                 struct net2280_ep *ep = &dev->ep[tmp + 1];
2124                 struct net2280_dma_regs __iomem *dma;
2125
2126                 if (ep->dma) {
2127                         abort_dma(ep);
2128                 } else {
2129                         dma = &dev->dma[tmp];
2130                         writel(BIT(DMA_ABORT), &dma->dmastat);
2131                         writel(0, &dma->dmactl);
2132                 }
2133         }
2134
2135         writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2136
2137         if (dev->bug7734_patched) {
2138                 /* reset, and enable pci */
2139                 tmp = readl(&dev->regs->devinit) |
2140                     BIT(PCI_ENABLE) |
2141                     BIT(FIFO_SOFT_RESET) |
2142                     BIT(USB_SOFT_RESET) |
2143                     BIT(M8051_RESET);
2144
2145                 writel(tmp, &dev->regs->devinit);
2146         }
2147
2148         /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2149         INIT_LIST_HEAD(&dev->gadget.ep_list);
2150
2151         for (tmp = 1; tmp < dev->n_ep; tmp++)
2152                 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2153
2154 }
2155
2156 static void usb_reset(struct net2280 *dev)
2157 {
2158         if (dev->quirks & PLX_LEGACY)
2159                 return usb_reset_228x(dev);
2160         return usb_reset_338x(dev);
2161 }
2162
2163 static void usb_reinit_228x(struct net2280 *dev)
2164 {
2165         u32     tmp;
2166
2167         /* basic endpoint init */
2168         for (tmp = 0; tmp < 7; tmp++) {
2169                 struct net2280_ep       *ep = &dev->ep[tmp];
2170
2171                 ep->ep.name = ep_info_dft[tmp].name;
2172                 ep->ep.caps = ep_info_dft[tmp].caps;
2173                 ep->dev = dev;
2174                 ep->num = tmp;
2175
2176                 if (tmp > 0 && tmp <= 4) {
2177                         ep->fifo_size = 1024;
2178                         ep->dma = &dev->dma[tmp - 1];
2179                 } else
2180                         ep->fifo_size = 64;
2181                 ep->regs = &dev->epregs[tmp];
2182                 ep->cfg = &dev->epregs[tmp];
2183                 ep_reset_228x(dev->regs, ep);
2184         }
2185         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2186         usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2187         usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2188
2189         dev->gadget.ep0 = &dev->ep[0].ep;
2190         dev->ep[0].stopped = 0;
2191         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2192
2193         /* we want to prevent lowlevel/insecure access from the USB host,
2194          * but erratum 0119 means this enable bit is ignored
2195          */
2196         for (tmp = 0; tmp < 5; tmp++)
2197                 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2198 }
2199
2200 static void usb_reinit_338x(struct net2280 *dev)
2201 {
2202         int i;
2203         u32 tmp, val;
2204         static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2205         static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2206                                                 0x00, 0xC0, 0x00, 0xC0 };
2207
2208         /* basic endpoint init */
2209         for (i = 0; i < dev->n_ep; i++) {
2210                 struct net2280_ep *ep = &dev->ep[i];
2211
2212                 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2213                                                    ep_info_dft[i].name;
2214                 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2215                                                    ep_info_dft[i].caps;
2216                 ep->dev = dev;
2217                 ep->num = i;
2218
2219                 if (i > 0 && i <= 4)
2220                         ep->dma = &dev->dma[i - 1];
2221
2222                 if (dev->enhanced_mode) {
2223                         ep->cfg = &dev->epregs[ne[i]];
2224                         /*
2225                          * Set USB endpoint number, hardware allows same number
2226                          * in both directions.
2227                          */
2228                          if (i > 0 && i < 5)
2229                                 writel(ne[i], &ep->cfg->ep_cfg);
2230                         ep->regs = (struct net2280_ep_regs __iomem *)
2231                                 (((void __iomem *)&dev->epregs[ne[i]]) +
2232                                 ep_reg_addr[i]);
2233                 } else {
2234                         ep->cfg = &dev->epregs[i];
2235                         ep->regs = &dev->epregs[i];
2236                 }
2237
2238                 ep->fifo_size = (i != 0) ? 2048 : 512;
2239
2240                 ep_reset_338x(dev->regs, ep);
2241         }
2242         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2243
2244         dev->gadget.ep0 = &dev->ep[0].ep;
2245         dev->ep[0].stopped = 0;
2246
2247         /* Link layer set up */
2248         if (dev->bug7734_patched) {
2249                 tmp = readl(&dev->usb_ext->usbctl2) &
2250                     ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2251                 writel(tmp, &dev->usb_ext->usbctl2);
2252         }
2253
2254         /* Hardware Defect and Workaround */
2255         val = readl(&dev->ll_lfps_regs->ll_lfps_5);
2256         val &= ~(0xf << TIMER_LFPS_6US);
2257         val |= 0x5 << TIMER_LFPS_6US;
2258         writel(val, &dev->ll_lfps_regs->ll_lfps_5);
2259
2260         val = readl(&dev->ll_lfps_regs->ll_lfps_6);
2261         val &= ~(0xffff << TIMER_LFPS_80US);
2262         val |= 0x0100 << TIMER_LFPS_80US;
2263         writel(val, &dev->ll_lfps_regs->ll_lfps_6);
2264
2265         /*
2266          * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2267          * Hot Reset Exit Handshake may Fail in Specific Case using
2268          * Default Register Settings. Workaround for Enumeration test.
2269          */
2270         val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
2271         val &= ~(0x1f << HOT_TX_NORESET_TS2);
2272         val |= 0x10 << HOT_TX_NORESET_TS2;
2273         writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
2274
2275         val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
2276         val &= ~(0x1f << HOT_RX_RESET_TS2);
2277         val |= 0x3 << HOT_RX_RESET_TS2;
2278         writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
2279
2280         /*
2281          * Set Recovery Idle to Recover bit:
2282          * - On SS connections, setting Recovery Idle to Recover Fmw improves
2283          *   link robustness with various hosts and hubs.
2284          * - It is safe to set for all connection speeds; all chip revisions.
2285          * - R-M-W to leave other bits undisturbed.
2286          * - Reference PLX TT-7372
2287         */
2288         val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
2289         val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2290         writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
2291
2292         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2293
2294         /* disable dedicated endpoints */
2295         writel(0x0D, &dev->dep[0].dep_cfg);
2296         writel(0x0D, &dev->dep[1].dep_cfg);
2297         writel(0x0E, &dev->dep[2].dep_cfg);
2298         writel(0x0E, &dev->dep[3].dep_cfg);
2299         writel(0x0F, &dev->dep[4].dep_cfg);
2300         writel(0x0C, &dev->dep[5].dep_cfg);
2301 }
2302
2303 static void usb_reinit(struct net2280 *dev)
2304 {
2305         if (dev->quirks & PLX_LEGACY)
2306                 return usb_reinit_228x(dev);
2307         return usb_reinit_338x(dev);
2308 }
2309
2310 static void ep0_start_228x(struct net2280 *dev)
2311 {
2312         writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2313                 BIT(CLEAR_NAK_OUT_PACKETS) |
2314                 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2315                 &dev->epregs[0].ep_rsp);
2316
2317         /*
2318          * hardware optionally handles a bunch of standard requests
2319          * that the API hides from drivers anyway.  have it do so.
2320          * endpoint status/features are handled in software, to
2321          * help pass tests for some dubious behavior.
2322          */
2323         writel(BIT(SET_TEST_MODE) |
2324                 BIT(SET_ADDRESS) |
2325                 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2326                 BIT(GET_DEVICE_STATUS) |
2327                 BIT(GET_INTERFACE_STATUS),
2328                 &dev->usb->stdrsp);
2329         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2330                 BIT(SELF_POWERED_USB_DEVICE) |
2331                 BIT(REMOTE_WAKEUP_SUPPORT) |
2332                 (dev->softconnect << USB_DETECT_ENABLE) |
2333                 BIT(SELF_POWERED_STATUS),
2334                 &dev->usb->usbctl);
2335
2336         /* enable irqs so we can see ep0 and general operation  */
2337         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2338                 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2339                 &dev->regs->pciirqenb0);
2340         writel(BIT(PCI_INTERRUPT_ENABLE) |
2341                 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2342                 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2343                 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2344                 BIT(VBUS_INTERRUPT_ENABLE) |
2345                 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2346                 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2347                 &dev->regs->pciirqenb1);
2348
2349         /* don't leave any writes posted */
2350         (void) readl(&dev->usb->usbctl);
2351 }
2352
2353 static void ep0_start_338x(struct net2280 *dev)
2354 {
2355
2356         if (dev->bug7734_patched)
2357                 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2358                        BIT(SET_EP_HIDE_STATUS_PHASE),
2359                        &dev->epregs[0].ep_rsp);
2360
2361         /*
2362          * hardware optionally handles a bunch of standard requests
2363          * that the API hides from drivers anyway.  have it do so.
2364          * endpoint status/features are handled in software, to
2365          * help pass tests for some dubious behavior.
2366          */
2367         writel(BIT(SET_ISOCHRONOUS_DELAY) |
2368                BIT(SET_SEL) |
2369                BIT(SET_TEST_MODE) |
2370                BIT(SET_ADDRESS) |
2371                BIT(GET_INTERFACE_STATUS) |
2372                BIT(GET_DEVICE_STATUS),
2373                 &dev->usb->stdrsp);
2374         dev->wakeup_enable = 1;
2375         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2376                (dev->softconnect << USB_DETECT_ENABLE) |
2377                BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2378                &dev->usb->usbctl);
2379
2380         /* enable irqs so we can see ep0 and general operation  */
2381         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2382                BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2383                &dev->regs->pciirqenb0);
2384         writel(BIT(PCI_INTERRUPT_ENABLE) |
2385                BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2386                BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2387                BIT(VBUS_INTERRUPT_ENABLE),
2388                &dev->regs->pciirqenb1);
2389
2390         /* don't leave any writes posted */
2391         (void)readl(&dev->usb->usbctl);
2392 }
2393
2394 static void ep0_start(struct net2280 *dev)
2395 {
2396         if (dev->quirks & PLX_LEGACY)
2397                 return ep0_start_228x(dev);
2398         return ep0_start_338x(dev);
2399 }
2400
2401 /* when a driver is successfully registered, it will receive
2402  * control requests including set_configuration(), which enables
2403  * non-control requests.  then usb traffic follows until a
2404  * disconnect is reported.  then a host may connect again, or
2405  * the driver might get unbound.
2406  */
2407 static int net2280_start(struct usb_gadget *_gadget,
2408                 struct usb_gadget_driver *driver)
2409 {
2410         struct net2280          *dev;
2411         int                     retval;
2412         unsigned                i;
2413
2414         /* insist on high speed support from the driver, since
2415          * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2416          * "must not be used in normal operation"
2417          */
2418         if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2419                         !driver->setup)
2420                 return -EINVAL;
2421
2422         dev = container_of(_gadget, struct net2280, gadget);
2423
2424         for (i = 0; i < dev->n_ep; i++)
2425                 dev->ep[i].irqs = 0;
2426
2427         /* hook up the driver ... */
2428         driver->driver.bus = NULL;
2429         dev->driver = driver;
2430
2431         retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2432         if (retval)
2433                 goto err_unbind;
2434         retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2435         if (retval)
2436                 goto err_func;
2437
2438         /* enable host detection and ep0; and we're ready
2439          * for set_configuration as well as eventual disconnect.
2440          */
2441         net2280_led_active(dev, 1);
2442
2443         if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
2444                 defect7374_enable_data_eps_zero(dev);
2445
2446         ep0_start(dev);
2447
2448         /* pci writes may still be posted */
2449         return 0;
2450
2451 err_func:
2452         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2453 err_unbind:
2454         dev->driver = NULL;
2455         return retval;
2456 }
2457
2458 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2459 {
2460         int                     i;
2461
2462         /* don't disconnect if it's not connected */
2463         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2464                 driver = NULL;
2465
2466         /* stop hardware; prevent new request submissions;
2467          * and kill any outstanding requests.
2468          */
2469         usb_reset(dev);
2470         for (i = 0; i < dev->n_ep; i++)
2471                 nuke(&dev->ep[i]);
2472
2473         /* report disconnect; the driver is already quiesced */
2474         if (driver) {
2475                 spin_unlock(&dev->lock);
2476                 driver->disconnect(&dev->gadget);
2477                 spin_lock(&dev->lock);
2478         }
2479
2480         usb_reinit(dev);
2481 }
2482
2483 static int net2280_stop(struct usb_gadget *_gadget)
2484 {
2485         struct net2280  *dev;
2486         unsigned long   flags;
2487
2488         dev = container_of(_gadget, struct net2280, gadget);
2489
2490         spin_lock_irqsave(&dev->lock, flags);
2491         stop_activity(dev, NULL);
2492         spin_unlock_irqrestore(&dev->lock, flags);
2493
2494         net2280_led_active(dev, 0);
2495
2496         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2497         device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2498
2499         dev->driver = NULL;
2500
2501         return 0;
2502 }
2503
2504 /*-------------------------------------------------------------------------*/
2505
2506 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2507  * also works for dma-capable endpoints, in pio mode or just
2508  * to manually advance the queue after short OUT transfers.
2509  */
2510 static void handle_ep_small(struct net2280_ep *ep)
2511 {
2512         struct net2280_request  *req;
2513         u32                     t;
2514         /* 0 error, 1 mid-data, 2 done */
2515         int                     mode = 1;
2516
2517         if (!list_empty(&ep->queue))
2518                 req = list_entry(ep->queue.next,
2519                         struct net2280_request, queue);
2520         else
2521                 req = NULL;
2522
2523         /* ack all, and handle what we care about */
2524         t = readl(&ep->regs->ep_stat);
2525         ep->irqs++;
2526
2527         ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2528                         ep->ep.name, t, req ? &req->req : NULL);
2529
2530         if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2531                 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2532         else
2533                 /* Added for 2282 */
2534                 writel(t, &ep->regs->ep_stat);
2535
2536         /* for ep0, monitor token irqs to catch data stage length errors
2537          * and to synchronize on status.
2538          *
2539          * also, to defer reporting of protocol stalls ... here's where
2540          * data or status first appears, handling stalls here should never
2541          * cause trouble on the host side..
2542          *
2543          * control requests could be slightly faster without token synch for
2544          * status, but status can jam up that way.
2545          */
2546         if (unlikely(ep->num == 0)) {
2547                 if (ep->is_in) {
2548                         /* status; stop NAKing */
2549                         if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2550                                 if (ep->dev->protocol_stall) {
2551                                         ep->stopped = 1;
2552                                         set_halt(ep);
2553                                 }
2554                                 if (!req)
2555                                         allow_status(ep);
2556                                 mode = 2;
2557                         /* reply to extra IN data tokens with a zlp */
2558                         } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2559                                 if (ep->dev->protocol_stall) {
2560                                         ep->stopped = 1;
2561                                         set_halt(ep);
2562                                         mode = 2;
2563                                 } else if (ep->responded &&
2564                                                 !req && !ep->stopped)
2565                                         write_fifo(ep, NULL);
2566                         }
2567                 } else {
2568                         /* status; stop NAKing */
2569                         if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2570                                 if (ep->dev->protocol_stall) {
2571                                         ep->stopped = 1;
2572                                         set_halt(ep);
2573                                 }
2574                                 mode = 2;
2575                         /* an extra OUT token is an error */
2576                         } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2577                                         req &&
2578                                         req->req.actual == req->req.length) ||
2579                                         (ep->responded && !req)) {
2580                                 ep->dev->protocol_stall = 1;
2581                                 set_halt(ep);
2582                                 ep->stopped = 1;
2583                                 if (req)
2584                                         done(ep, req, -EOVERFLOW);
2585                                 req = NULL;
2586                         }
2587                 }
2588         }
2589
2590         if (unlikely(!req))
2591                 return;
2592
2593         /* manual DMA queue advance after short OUT */
2594         if (likely(ep->dma)) {
2595                 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2596                         struct net2280_request *stuck_req = NULL;
2597                         int     stopped = ep->stopped;
2598                         int     num_completed;
2599                         int     stuck = 0;
2600                         u32     count;
2601
2602                         /* TRANSFERRED works around OUT_DONE erratum 0112.
2603                          * we expect (N <= maxpacket) bytes; host wrote M.
2604                          * iff (M < N) we won't ever see a DMA interrupt.
2605                          */
2606                         ep->stopped = 1;
2607                         for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2608
2609                                 /* any preceding dma transfers must finish.
2610                                  * dma handles (M >= N), may empty the queue
2611                                  */
2612                                 num_completed = scan_dma_completions(ep);
2613                                 if (unlikely(list_empty(&ep->queue) ||
2614                                                 ep->out_overflow)) {
2615                                         req = NULL;
2616                                         break;
2617                                 }
2618                                 req = list_entry(ep->queue.next,
2619                                         struct net2280_request, queue);
2620
2621                                 /* here either (M < N), a "real" short rx;
2622                                  * or (M == N) and the queue didn't empty
2623                                  */
2624                                 if (likely(t & BIT(FIFO_EMPTY))) {
2625                                         count = readl(&ep->dma->dmacount);
2626                                         count &= DMA_BYTE_COUNT_MASK;
2627                                         if (readl(&ep->dma->dmadesc)
2628                                                         != req->td_dma)
2629                                                 req = NULL;
2630                                         break;
2631                                 }
2632
2633                                 /* Escape loop if no dma transfers completed
2634                                  * after few retries.
2635                                  */
2636                                 if (num_completed == 0) {
2637                                         if (stuck_req == req &&
2638                                             readl(&ep->dma->dmadesc) !=
2639                                                   req->td_dma && stuck++ > 5) {
2640                                                 count = readl(
2641                                                         &ep->dma->dmacount);
2642                                                 count &= DMA_BYTE_COUNT_MASK;
2643                                                 req = NULL;
2644                                                 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n",
2645                                                         ep->ep.name, stuck,
2646                                                         count);
2647                                                 break;
2648                                         } else if (stuck_req != req) {
2649                                                 stuck_req = req;
2650                                                 stuck = 0;
2651                                         }
2652                                 } else {
2653                                         stuck_req = NULL;
2654                                         stuck = 0;
2655                                 }
2656
2657                                 udelay(1);
2658                         }
2659
2660                         /* stop DMA, leave ep NAKing */
2661                         writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2662                         spin_stop_dma(ep->dma);
2663
2664                         if (likely(req)) {
2665                                 req->td->dmacount = 0;
2666                                 t = readl(&ep->regs->ep_avail);
2667                                 dma_done(ep, req, count,
2668                                         (ep->out_overflow || t)
2669                                                 ? -EOVERFLOW : 0);
2670                         }
2671
2672                         /* also flush to prevent erratum 0106 trouble */
2673                         if (unlikely(ep->out_overflow ||
2674                                         (ep->dev->chiprev == 0x0100 &&
2675                                         ep->dev->gadget.speed
2676                                         == USB_SPEED_FULL))) {
2677                                 out_flush(ep);
2678                                 ep->out_overflow = 0;
2679                         }
2680
2681                         /* (re)start dma if needed, stop NAKing */
2682                         ep->stopped = stopped;
2683                         if (!list_empty(&ep->queue))
2684                                 restart_dma(ep);
2685                 } else
2686                         ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2687                                         ep->ep.name, t);
2688                 return;
2689
2690         /* data packet(s) received (in the fifo, OUT) */
2691         } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2692                 if (read_fifo(ep, req) && ep->num != 0)
2693                         mode = 2;
2694
2695         /* data packet(s) transmitted (IN) */
2696         } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2697                 unsigned        len;
2698
2699                 len = req->req.length - req->req.actual;
2700                 if (len > ep->ep.maxpacket)
2701                         len = ep->ep.maxpacket;
2702                 req->req.actual += len;
2703
2704                 /* if we wrote it all, we're usually done */
2705                 /* send zlps until the status stage */
2706                 if ((req->req.actual == req->req.length) &&
2707                         (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2708                                 mode = 2;
2709
2710         /* there was nothing to do ...  */
2711         } else if (mode == 1)
2712                 return;
2713
2714         /* done */
2715         if (mode == 2) {
2716                 /* stream endpoints often resubmit/unlink in completion */
2717                 done(ep, req, 0);
2718
2719                 /* maybe advance queue to next request */
2720                 if (ep->num == 0) {
2721                         /* NOTE:  net2280 could let gadget driver start the
2722                          * status stage later. since not all controllers let
2723                          * them control that, the api doesn't (yet) allow it.
2724                          */
2725                         if (!ep->stopped)
2726                                 allow_status(ep);
2727                         req = NULL;
2728                 } else {
2729                         if (!list_empty(&ep->queue) && !ep->stopped)
2730                                 req = list_entry(ep->queue.next,
2731                                         struct net2280_request, queue);
2732                         else
2733                                 req = NULL;
2734                         if (req && !ep->is_in)
2735                                 stop_out_naking(ep);
2736                 }
2737         }
2738
2739         /* is there a buffer for the next packet?
2740          * for best streaming performance, make sure there is one.
2741          */
2742         if (req && !ep->stopped) {
2743
2744                 /* load IN fifo with next packet (may be zlp) */
2745                 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2746                         write_fifo(ep, &req->req);
2747         }
2748 }
2749
2750 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2751 {
2752         struct net2280_ep       *ep;
2753
2754         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2755                 return &dev->ep[0];
2756         list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2757                 u8      bEndpointAddress;
2758
2759                 if (!ep->desc)
2760                         continue;
2761                 bEndpointAddress = ep->desc->bEndpointAddress;
2762                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2763                         continue;
2764                 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2765                         return ep;
2766         }
2767         return NULL;
2768 }
2769
2770 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2771 {
2772         u32 scratch, fsmvalue;
2773         u32 ack_wait_timeout, state;
2774
2775         /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2776         scratch = get_idx_reg(dev->regs, SCRATCH);
2777         fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2778         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2779
2780         if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2781                                 (r.bRequestType & USB_DIR_IN)))
2782                 return;
2783
2784         /* This is the first Control Read for this connection: */
2785         if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2786                 /*
2787                  * Connection is NOT SS:
2788                  * - Connection must be FS or HS.
2789                  * - This FSM state should allow workaround software to
2790                  * run after the next USB connection.
2791                  */
2792                 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2793                 dev->bug7734_patched = 1;
2794                 goto restore_data_eps;
2795         }
2796
2797         /* Connection is SS: */
2798         for (ack_wait_timeout = 0;
2799                         ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2800                         ack_wait_timeout++) {
2801
2802                 state = readl(&dev->plregs->pl_ep_status_1)
2803                         & (0xff << STATE);
2804                 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2805                         (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2806                         scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2807                         dev->bug7734_patched = 1;
2808                         break;
2809                 }
2810
2811                 /*
2812                  * We have not yet received host's Data Phase ACK
2813                  * - Wait and try again.
2814                  */
2815                 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2816
2817                 continue;
2818         }
2819
2820
2821         if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2822                 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2823                 "to detect SS host's data phase ACK.");
2824                 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2825                 "got 0x%2.2x.\n", state >> STATE);
2826         } else {
2827                 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2828                 "%duSec for Control Read Data Phase ACK\n",
2829                         DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2830         }
2831
2832 restore_data_eps:
2833         /*
2834          * Restore data EPs to their pre-workaround settings (disabled,
2835          * initialized, and other details).
2836          */
2837         defect7374_disable_data_eps(dev);
2838
2839         set_idx_reg(dev->regs, SCRATCH, scratch);
2840
2841         return;
2842 }
2843
2844 static void ep_clear_seqnum(struct net2280_ep *ep)
2845 {
2846         struct net2280 *dev = ep->dev;
2847         u32 val;
2848         static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2849
2850         val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2851         val |= ep_pl[ep->num];
2852         writel(val, &dev->plregs->pl_ep_ctrl);
2853         val |= BIT(SEQUENCE_NUMBER_RESET);
2854         writel(val, &dev->plregs->pl_ep_ctrl);
2855
2856         return;
2857 }
2858
2859 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2860                 struct net2280_ep *ep, struct usb_ctrlrequest r)
2861 {
2862         int tmp = 0;
2863
2864 #define w_value         le16_to_cpu(r.wValue)
2865 #define w_index         le16_to_cpu(r.wIndex)
2866 #define w_length        le16_to_cpu(r.wLength)
2867
2868         switch (r.bRequest) {
2869                 struct net2280_ep *e;
2870                 u16 status;
2871
2872         case USB_REQ_SET_CONFIGURATION:
2873                 dev->addressed_state = !w_value;
2874                 goto usb3_delegate;
2875
2876         case USB_REQ_GET_STATUS:
2877                 switch (r.bRequestType) {
2878                 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2879                         status = dev->wakeup_enable ? 0x02 : 0x00;
2880                         if (dev->gadget.is_selfpowered)
2881                                 status |= BIT(0);
2882                         status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2883                                                         dev->ltm_enable << 4);
2884                         writel(0, &dev->epregs[0].ep_irqenb);
2885                         set_fifo_bytecount(ep, sizeof(status));
2886                         writel((__force u32) status, &dev->epregs[0].ep_data);
2887                         allow_status_338x(ep);
2888                         break;
2889
2890                 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2891                         e = get_ep_by_addr(dev, w_index);
2892                         if (!e)
2893                                 goto do_stall3;
2894                         status = readl(&e->regs->ep_rsp) &
2895                                                 BIT(CLEAR_ENDPOINT_HALT);
2896                         writel(0, &dev->epregs[0].ep_irqenb);
2897                         set_fifo_bytecount(ep, sizeof(status));
2898                         writel((__force u32) status, &dev->epregs[0].ep_data);
2899                         allow_status_338x(ep);
2900                         break;
2901
2902                 default:
2903                         goto usb3_delegate;
2904                 }
2905                 break;
2906
2907         case USB_REQ_CLEAR_FEATURE:
2908                 switch (r.bRequestType) {
2909                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2910                         if (!dev->addressed_state) {
2911                                 switch (w_value) {
2912                                 case USB_DEVICE_U1_ENABLE:
2913                                         dev->u1_enable = 0;
2914                                         writel(readl(&dev->usb_ext->usbctl2) &
2915                                                 ~BIT(U1_ENABLE),
2916                                                 &dev->usb_ext->usbctl2);
2917                                         allow_status_338x(ep);
2918                                         goto next_endpoints3;
2919
2920                                 case USB_DEVICE_U2_ENABLE:
2921                                         dev->u2_enable = 0;
2922                                         writel(readl(&dev->usb_ext->usbctl2) &
2923                                                 ~BIT(U2_ENABLE),
2924                                                 &dev->usb_ext->usbctl2);
2925                                         allow_status_338x(ep);
2926                                         goto next_endpoints3;
2927
2928                                 case USB_DEVICE_LTM_ENABLE:
2929                                         dev->ltm_enable = 0;
2930                                         writel(readl(&dev->usb_ext->usbctl2) &
2931                                                 ~BIT(LTM_ENABLE),
2932                                                 &dev->usb_ext->usbctl2);
2933                                         allow_status_338x(ep);
2934                                         goto next_endpoints3;
2935
2936                                 default:
2937                                         break;
2938                                 }
2939                         }
2940                         if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2941                                 dev->wakeup_enable = 0;
2942                                 writel(readl(&dev->usb->usbctl) &
2943                                         ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2944                                         &dev->usb->usbctl);
2945                                 allow_status_338x(ep);
2946                                 break;
2947                         }
2948                         goto usb3_delegate;
2949
2950                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2951                         e = get_ep_by_addr(dev, w_index);
2952                         if (!e)
2953                                 goto do_stall3;
2954                         if (w_value != USB_ENDPOINT_HALT)
2955                                 goto do_stall3;
2956                         ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2957                         /*
2958                          * Workaround for SS SeqNum not cleared via
2959                          * Endpoint Halt (Clear) bit. select endpoint
2960                          */
2961                         ep_clear_seqnum(e);
2962                         clear_halt(e);
2963                         if (!list_empty(&e->queue) && e->td_dma)
2964                                 restart_dma(e);
2965                         allow_status(ep);
2966                         ep->stopped = 1;
2967                         break;
2968
2969                 default:
2970                         goto usb3_delegate;
2971                 }
2972                 break;
2973         case USB_REQ_SET_FEATURE:
2974                 switch (r.bRequestType) {
2975                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2976                         if (!dev->addressed_state) {
2977                                 switch (w_value) {
2978                                 case USB_DEVICE_U1_ENABLE:
2979                                         dev->u1_enable = 1;
2980                                         writel(readl(&dev->usb_ext->usbctl2) |
2981                                                 BIT(U1_ENABLE),
2982                                                 &dev->usb_ext->usbctl2);
2983                                         allow_status_338x(ep);
2984                                         goto next_endpoints3;
2985
2986                                 case USB_DEVICE_U2_ENABLE:
2987                                         dev->u2_enable = 1;
2988                                         writel(readl(&dev->usb_ext->usbctl2) |
2989                                                 BIT(U2_ENABLE),
2990                                                 &dev->usb_ext->usbctl2);
2991                                         allow_status_338x(ep);
2992                                         goto next_endpoints3;
2993
2994                                 case USB_DEVICE_LTM_ENABLE:
2995                                         dev->ltm_enable = 1;
2996                                         writel(readl(&dev->usb_ext->usbctl2) |
2997                                                 BIT(LTM_ENABLE),
2998                                                 &dev->usb_ext->usbctl2);
2999                                         allow_status_338x(ep);
3000                                         goto next_endpoints3;
3001                                 default:
3002                                         break;
3003                                 }
3004                         }
3005
3006                         if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
3007                                 dev->wakeup_enable = 1;
3008                                 writel(readl(&dev->usb->usbctl) |
3009                                         BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
3010                                         &dev->usb->usbctl);
3011                                 allow_status_338x(ep);
3012                                 break;
3013                         }
3014                         goto usb3_delegate;
3015
3016                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
3017                         e = get_ep_by_addr(dev, w_index);
3018                         if (!e || (w_value != USB_ENDPOINT_HALT))
3019                                 goto do_stall3;
3020                         ep->stopped = 1;
3021                         if (ep->num == 0)
3022                                 ep->dev->protocol_stall = 1;
3023                         else {
3024                                 if (ep->dma)
3025                                         abort_dma(ep);
3026                                 set_halt(ep);
3027                         }
3028                         allow_status_338x(ep);
3029                         break;
3030
3031                 default:
3032                         goto usb3_delegate;
3033                 }
3034
3035                 break;
3036         default:
3037
3038 usb3_delegate:
3039                 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
3040                                 r.bRequestType, r.bRequest,
3041                                 w_value, w_index, w_length,
3042                                 readl(&ep->cfg->ep_cfg));
3043
3044                 ep->responded = 0;
3045                 spin_unlock(&dev->lock);
3046                 tmp = dev->driver->setup(&dev->gadget, &r);
3047                 spin_lock(&dev->lock);
3048         }
3049 do_stall3:
3050         if (tmp < 0) {
3051                 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3052                                 r.bRequestType, r.bRequest, tmp);
3053                 dev->protocol_stall = 1;
3054                 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
3055                 set_halt(ep);
3056         }
3057
3058 next_endpoints3:
3059
3060 #undef  w_value
3061 #undef  w_index
3062 #undef  w_length
3063
3064         return;
3065 }
3066
3067 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
3068 {
3069         u32 index;
3070         u32 bit;
3071
3072         for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
3073                 bit = BIT(ep_bit[index]);
3074
3075                 if (!stat0)
3076                         break;
3077
3078                 if (!(stat0 & bit))
3079                         continue;
3080
3081                 stat0 &= ~bit;
3082
3083                 handle_ep_small(&dev->ep[index]);
3084         }
3085 }
3086
3087 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
3088 {
3089         struct net2280_ep       *ep;
3090         u32                     num, scratch;
3091
3092         /* most of these don't need individual acks */
3093         stat &= ~BIT(INTA_ASSERTED);
3094         if (!stat)
3095                 return;
3096         /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
3097
3098         /* starting a control request? */
3099         if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
3100                 union {
3101                         u32                     raw[2];
3102                         struct usb_ctrlrequest  r;
3103                 } u;
3104                 int                             tmp;
3105                 struct net2280_request          *req;
3106
3107                 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
3108                         u32 val = readl(&dev->usb->usbstat);
3109                         if (val & BIT(SUPER_SPEED)) {
3110                                 dev->gadget.speed = USB_SPEED_SUPER;
3111                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3112                                                 EP0_SS_MAX_PACKET_SIZE);
3113                         } else if (val & BIT(HIGH_SPEED)) {
3114                                 dev->gadget.speed = USB_SPEED_HIGH;
3115                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3116                                                 EP0_HS_MAX_PACKET_SIZE);
3117                         } else {
3118                                 dev->gadget.speed = USB_SPEED_FULL;
3119                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3120                                                 EP0_HS_MAX_PACKET_SIZE);
3121                         }
3122                         net2280_led_speed(dev, dev->gadget.speed);
3123                         ep_dbg(dev, "%s\n",
3124                                         usb_speed_string(dev->gadget.speed));
3125                 }
3126
3127                 ep = &dev->ep[0];
3128                 ep->irqs++;
3129
3130                 /* make sure any leftover request state is cleared */
3131                 stat &= ~BIT(ENDPOINT_0_INTERRUPT);
3132                 while (!list_empty(&ep->queue)) {
3133                         req = list_entry(ep->queue.next,
3134                                         struct net2280_request, queue);
3135                         done(ep, req, (req->req.actual == req->req.length)
3136                                                 ? 0 : -EPROTO);
3137                 }
3138                 ep->stopped = 0;
3139                 dev->protocol_stall = 0;
3140                 if (!(dev->quirks & PLX_PCIE)) {
3141                         if (ep->dev->quirks & PLX_2280)
3142                                 tmp = BIT(FIFO_OVERFLOW) |
3143                                     BIT(FIFO_UNDERFLOW);
3144                         else
3145                                 tmp = 0;
3146
3147                         writel(tmp | BIT(TIMEOUT) |
3148                                    BIT(USB_STALL_SENT) |
3149                                    BIT(USB_IN_NAK_SENT) |
3150                                    BIT(USB_IN_ACK_RCVD) |
3151                                    BIT(USB_OUT_PING_NAK_SENT) |
3152                                    BIT(USB_OUT_ACK_SENT) |
3153                                    BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3154                                    BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3155                                    BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3156                                    BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3157                                    BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3158                                    BIT(DATA_IN_TOKEN_INTERRUPT),
3159                                    &ep->regs->ep_stat);
3160                 }
3161                 u.raw[0] = readl(&dev->usb->setup0123);
3162                 u.raw[1] = readl(&dev->usb->setup4567);
3163
3164                 cpu_to_le32s(&u.raw[0]);
3165                 cpu_to_le32s(&u.raw[1]);
3166
3167                 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
3168                         defect7374_workaround(dev, u.r);
3169
3170                 tmp = 0;
3171
3172 #define w_value         le16_to_cpu(u.r.wValue)
3173 #define w_index         le16_to_cpu(u.r.wIndex)
3174 #define w_length        le16_to_cpu(u.r.wLength)
3175
3176                 /* ack the irq */
3177                 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3178                 stat ^= BIT(SETUP_PACKET_INTERRUPT);
3179
3180                 /* watch control traffic at the token level, and force
3181                  * synchronization before letting the status stage happen.
3182                  * FIXME ignore tokens we'll NAK, until driver responds.
3183                  * that'll mean a lot less irqs for some drivers.
3184                  */
3185                 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3186                 if (ep->is_in) {
3187                         scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3188                                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3189                                 BIT(DATA_IN_TOKEN_INTERRUPT);
3190                         stop_out_naking(ep);
3191                 } else
3192                         scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3193                                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3194                                 BIT(DATA_IN_TOKEN_INTERRUPT);
3195                 writel(scratch, &dev->epregs[0].ep_irqenb);
3196
3197                 /* we made the hardware handle most lowlevel requests;
3198                  * everything else goes uplevel to the gadget code.
3199                  */
3200                 ep->responded = 1;
3201
3202                 if (dev->gadget.speed == USB_SPEED_SUPER) {
3203                         handle_stat0_irqs_superspeed(dev, ep, u.r);
3204                         goto next_endpoints;
3205                 }
3206
3207                 switch (u.r.bRequest) {
3208                 case USB_REQ_GET_STATUS: {
3209                         struct net2280_ep       *e;
3210                         __le32                  status;
3211
3212                         /* hw handles device and interface status */
3213                         if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3214                                 goto delegate;
3215                         e = get_ep_by_addr(dev, w_index);
3216                         if (!e || w_length > 2)
3217                                 goto do_stall;
3218
3219                         if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3220                                 status = cpu_to_le32(1);
3221                         else
3222                                 status = cpu_to_le32(0);
3223
3224                         /* don't bother with a request object! */
3225                         writel(0, &dev->epregs[0].ep_irqenb);
3226                         set_fifo_bytecount(ep, w_length);
3227                         writel((__force u32)status, &dev->epregs[0].ep_data);
3228                         allow_status(ep);
3229                         ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3230                         goto next_endpoints;
3231                         }
3232                         break;
3233                 case USB_REQ_CLEAR_FEATURE: {
3234                         struct net2280_ep       *e;
3235
3236                         /* hw handles device features */
3237                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3238                                 goto delegate;
3239                         if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3240                                 goto do_stall;
3241                         e = get_ep_by_addr(dev, w_index);
3242                         if (!e)
3243                                 goto do_stall;
3244                         if (e->wedged) {
3245                                 ep_vdbg(dev, "%s wedged, halt not cleared\n",
3246                                                 ep->ep.name);
3247                         } else {
3248                                 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3249                                 clear_halt(e);
3250                                 if ((ep->dev->quirks & PLX_PCIE) &&
3251                                         !list_empty(&e->queue) && e->td_dma)
3252                                                 restart_dma(e);
3253                         }
3254                         allow_status(ep);
3255                         goto next_endpoints;
3256                         }
3257                         break;
3258                 case USB_REQ_SET_FEATURE: {
3259                         struct net2280_ep       *e;
3260
3261                         /* hw handles device features */
3262                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3263                                 goto delegate;
3264                         if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3265                                 goto do_stall;
3266                         e = get_ep_by_addr(dev, w_index);
3267                         if (!e)
3268                                 goto do_stall;
3269                         if (e->ep.name == ep0name)
3270                                 goto do_stall;
3271                         set_halt(e);
3272                         if ((dev->quirks & PLX_PCIE) && e->dma)
3273                                 abort_dma(e);
3274                         allow_status(ep);
3275                         ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3276                         goto next_endpoints;
3277                         }
3278                         break;
3279                 default:
3280 delegate:
3281                         ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3282                                 "ep_cfg %08x\n",
3283                                 u.r.bRequestType, u.r.bRequest,
3284                                 w_value, w_index, w_length,
3285                                 readl(&ep->cfg->ep_cfg));
3286                         ep->responded = 0;
3287                         spin_unlock(&dev->lock);
3288                         tmp = dev->driver->setup(&dev->gadget, &u.r);
3289                         spin_lock(&dev->lock);
3290                 }
3291
3292                 /* stall ep0 on error */
3293                 if (tmp < 0) {
3294 do_stall:
3295                         ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3296                                         u.r.bRequestType, u.r.bRequest, tmp);
3297                         dev->protocol_stall = 1;
3298                 }
3299
3300                 /* some in/out token irq should follow; maybe stall then.
3301                  * driver must queue a request (even zlp) or halt ep0
3302                  * before the host times out.
3303                  */
3304         }
3305
3306 #undef  w_value
3307 #undef  w_index
3308 #undef  w_length
3309
3310 next_endpoints:
3311         if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
3312                 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3313                         USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3314                         USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3315
3316                 if (stat & mask) {
3317                         usb338x_handle_ep_intr(dev, stat & mask);
3318                         stat &= ~mask;
3319                 }
3320         } else {
3321                 /* endpoint data irq ? */
3322                 scratch = stat & 0x7f;
3323                 stat &= ~0x7f;
3324                 for (num = 0; scratch; num++) {
3325                         u32             t;
3326
3327                         /* do this endpoint's FIFO and queue need tending? */
3328                         t = BIT(num);
3329                         if ((scratch & t) == 0)
3330                                 continue;
3331                         scratch ^= t;
3332
3333                         ep = &dev->ep[num];
3334                         handle_ep_small(ep);
3335                 }
3336         }
3337
3338         if (stat)
3339                 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3340 }
3341
3342 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3343                 BIT(DMA_C_INTERRUPT) | \
3344                 BIT(DMA_B_INTERRUPT) | \
3345                 BIT(DMA_A_INTERRUPT))
3346 #define PCI_ERROR_INTERRUPTS ( \
3347                 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3348                 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3349                 BIT(PCI_RETRY_ABORT_INTERRUPT))
3350
3351 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3352 __releases(dev->lock)
3353 __acquires(dev->lock)
3354 {
3355         struct net2280_ep       *ep;
3356         u32                     tmp, num, mask, scratch;
3357
3358         /* after disconnect there's nothing else to do! */
3359         tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3360         mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3361
3362         /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3363          * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3364          * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3365          * only indicates a change in the reset state).
3366          */
3367         if (stat & tmp) {
3368                 bool    reset = false;
3369                 bool    disconnect = false;
3370
3371                 /*
3372                  * Ignore disconnects and resets if the speed hasn't been set.
3373                  * VBUS can bounce and there's always an initial reset.
3374                  */
3375                 writel(tmp, &dev->regs->irqstat1);
3376                 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3377                         if ((stat & BIT(VBUS_INTERRUPT)) &&
3378                                         (readl(&dev->usb->usbctl) &
3379                                                 BIT(VBUS_PIN)) == 0) {
3380                                 disconnect = true;
3381                                 ep_dbg(dev, "disconnect %s\n",
3382                                                 dev->driver->driver.name);
3383                         } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3384                                         (readl(&dev->usb->usbstat) & mask)
3385                                                 == 0) {
3386                                 reset = true;
3387                                 ep_dbg(dev, "reset %s\n",
3388                                                 dev->driver->driver.name);
3389                         }
3390
3391                         if (disconnect || reset) {
3392                                 stop_activity(dev, dev->driver);
3393                                 ep0_start(dev);
3394                                 spin_unlock(&dev->lock);
3395                                 if (reset)
3396                                         usb_gadget_udc_reset
3397                                                 (&dev->gadget, dev->driver);
3398                                 else
3399                                         (dev->driver->disconnect)
3400                                                 (&dev->gadget);
3401                                 spin_lock(&dev->lock);
3402                                 return;
3403                         }
3404                 }
3405                 stat &= ~tmp;
3406
3407                 /* vBUS can bounce ... one of many reasons to ignore the
3408                  * notion of hotplug events on bus connect/disconnect!
3409                  */
3410                 if (!stat)
3411                         return;
3412         }
3413
3414         /* NOTE: chip stays in PCI D0 state for now, but it could
3415          * enter D1 to save more power
3416          */
3417         tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3418         if (stat & tmp) {
3419                 writel(tmp, &dev->regs->irqstat1);
3420                 spin_unlock(&dev->lock);
3421                 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3422                         if (dev->driver->suspend)
3423                                 dev->driver->suspend(&dev->gadget);
3424                         if (!enable_suspend)
3425                                 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3426                 } else {
3427                         if (dev->driver->resume)
3428                                 dev->driver->resume(&dev->gadget);
3429                         /* at high speed, note erratum 0133 */
3430                 }
3431                 spin_lock(&dev->lock);
3432                 stat &= ~tmp;
3433         }
3434
3435         /* clear any other status/irqs */
3436         if (stat)
3437                 writel(stat, &dev->regs->irqstat1);
3438
3439         /* some status we can just ignore */
3440         if (dev->quirks & PLX_2280)
3441                 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3442                           BIT(SUSPEND_REQUEST_INTERRUPT) |
3443                           BIT(RESUME_INTERRUPT) |
3444                           BIT(SOF_INTERRUPT));
3445         else
3446                 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3447                           BIT(RESUME_INTERRUPT) |
3448                           BIT(SOF_DOWN_INTERRUPT) |
3449                           BIT(SOF_INTERRUPT));
3450
3451         if (!stat)
3452                 return;
3453         /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3454
3455         /* DMA status, for ep-{a,b,c,d} */
3456         scratch = stat & DMA_INTERRUPTS;
3457         stat &= ~DMA_INTERRUPTS;
3458         scratch >>= 9;
3459         for (num = 0; scratch; num++) {
3460                 struct net2280_dma_regs __iomem *dma;
3461
3462                 tmp = BIT(num);
3463                 if ((tmp & scratch) == 0)
3464                         continue;
3465                 scratch ^= tmp;
3466
3467                 ep = &dev->ep[num + 1];
3468                 dma = ep->dma;
3469
3470                 if (!dma)
3471                         continue;
3472
3473                 /* clear ep's dma status */
3474                 tmp = readl(&dma->dmastat);
3475                 writel(tmp, &dma->dmastat);
3476
3477                 /* dma sync*/
3478                 if (dev->quirks & PLX_PCIE) {
3479                         u32 r_dmacount = readl(&dma->dmacount);
3480                         if (!ep->is_in &&  (r_dmacount & 0x00FFFFFF) &&
3481                             (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3482                                 continue;
3483                 }
3484
3485                 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3486                         ep_dbg(ep->dev, "%s no xact done? %08x\n",
3487                                 ep->ep.name, tmp);
3488                         continue;
3489                 }
3490                 stop_dma(ep->dma);
3491
3492                 /* OUT transfers terminate when the data from the
3493                  * host is in our memory.  Process whatever's done.
3494                  * On this path, we know transfer's last packet wasn't
3495                  * less than req->length. NAK_OUT_PACKETS may be set,
3496                  * or the FIFO may already be holding new packets.
3497                  *
3498                  * IN transfers can linger in the FIFO for a very
3499                  * long time ... we ignore that for now, accounting
3500                  * precisely (like PIO does) needs per-packet irqs
3501                  */
3502                 scan_dma_completions(ep);
3503
3504                 /* disable dma on inactive queues; else maybe restart */
3505                 if (!list_empty(&ep->queue)) {
3506                         tmp = readl(&dma->dmactl);
3507                         restart_dma(ep);
3508                 }
3509                 ep->irqs++;
3510         }
3511
3512         /* NOTE:  there are other PCI errors we might usefully notice.
3513          * if they appear very often, here's where to try recovering.
3514          */
3515         if (stat & PCI_ERROR_INTERRUPTS) {
3516                 ep_err(dev, "pci dma error; stat %08x\n", stat);
3517                 stat &= ~PCI_ERROR_INTERRUPTS;
3518                 /* these are fatal errors, but "maybe" they won't
3519                  * happen again ...
3520                  */
3521                 stop_activity(dev, dev->driver);
3522                 ep0_start(dev);
3523                 stat = 0;
3524         }
3525
3526         if (stat)
3527                 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3528 }
3529
3530 static irqreturn_t net2280_irq(int irq, void *_dev)
3531 {
3532         struct net2280          *dev = _dev;
3533
3534         /* shared interrupt, not ours */
3535         if ((dev->quirks & PLX_LEGACY) &&
3536                 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3537                 return IRQ_NONE;
3538
3539         spin_lock(&dev->lock);
3540
3541         /* handle disconnect, dma, and more */
3542         handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3543
3544         /* control requests and PIO */
3545         handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3546
3547         if (dev->quirks & PLX_PCIE) {
3548                 /* re-enable interrupt to trigger any possible new interrupt */
3549                 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3550                 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3551                 writel(pciirqenb1, &dev->regs->pciirqenb1);
3552         }
3553
3554         spin_unlock(&dev->lock);
3555
3556         return IRQ_HANDLED;
3557 }
3558
3559 /*-------------------------------------------------------------------------*/
3560
3561 static void gadget_release(struct device *_dev)
3562 {
3563         struct net2280  *dev = dev_get_drvdata(_dev);
3564
3565         kfree(dev);
3566 }
3567
3568 /* tear down the binding between this driver and the pci device */
3569
3570 static void net2280_remove(struct pci_dev *pdev)
3571 {
3572         struct net2280          *dev = pci_get_drvdata(pdev);
3573
3574         usb_del_gadget_udc(&dev->gadget);
3575
3576         BUG_ON(dev->driver);
3577
3578         /* then clean up the resources we allocated during probe() */
3579         if (dev->requests) {
3580                 int             i;
3581                 for (i = 1; i < 5; i++) {
3582                         if (!dev->ep[i].dummy)
3583                                 continue;
3584                         dma_pool_free(dev->requests, dev->ep[i].dummy,
3585                                         dev->ep[i].td_dma);
3586                 }
3587                 dma_pool_destroy(dev->requests);
3588         }
3589         if (dev->got_irq)
3590                 free_irq(pdev->irq, dev);
3591         if (dev->quirks & PLX_PCIE)
3592                 pci_disable_msi(pdev);
3593         if (dev->regs) {
3594                 net2280_led_shutdown(dev);
3595                 iounmap(dev->regs);
3596         }
3597         if (dev->region)
3598                 release_mem_region(pci_resource_start(pdev, 0),
3599                                 pci_resource_len(pdev, 0));
3600         if (dev->enabled)
3601                 pci_disable_device(pdev);
3602         device_remove_file(&pdev->dev, &dev_attr_registers);
3603
3604         ep_info(dev, "unbind\n");
3605 }
3606
3607 /* wrap this driver around the specified device, but
3608  * don't respond over USB until a gadget driver binds to us.
3609  */
3610
3611 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3612 {
3613         struct net2280          *dev;
3614         unsigned long           resource, len;
3615         void                    __iomem *base = NULL;
3616         int                     retval, i;
3617
3618         /* alloc, and start init */
3619         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3620         if (dev == NULL) {
3621                 retval = -ENOMEM;
3622                 goto done;
3623         }
3624
3625         pci_set_drvdata(pdev, dev);
3626         spin_lock_init(&dev->lock);
3627         dev->quirks = id->driver_data;
3628         dev->pdev = pdev;
3629         dev->gadget.ops = &net2280_ops;
3630         dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3631                                 USB_SPEED_SUPER : USB_SPEED_HIGH;
3632
3633         /* the "gadget" abstracts/virtualizes the controller */
3634         dev->gadget.name = driver_name;
3635
3636         /* now all the pci goodies ... */
3637         if (pci_enable_device(pdev) < 0) {
3638                 retval = -ENODEV;
3639                 goto done;
3640         }
3641         dev->enabled = 1;
3642
3643         /* BAR 0 holds all the registers
3644          * BAR 1 is 8051 memory; unused here (note erratum 0103)
3645          * BAR 2 is fifo memory; unused here
3646          */
3647         resource = pci_resource_start(pdev, 0);
3648         len = pci_resource_len(pdev, 0);
3649         if (!request_mem_region(resource, len, driver_name)) {
3650                 ep_dbg(dev, "controller already in use\n");
3651                 retval = -EBUSY;
3652                 goto done;
3653         }
3654         dev->region = 1;
3655
3656         /* FIXME provide firmware download interface to put
3657          * 8051 code into the chip, e.g. to turn on PCI PM.
3658          */
3659
3660         base = ioremap_nocache(resource, len);
3661         if (base == NULL) {
3662                 ep_dbg(dev, "can't map memory\n");
3663                 retval = -EFAULT;
3664                 goto done;
3665         }
3666         dev->regs = (struct net2280_regs __iomem *) base;
3667         dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3668         dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3669         dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3670         dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3671         dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3672
3673         if (dev->quirks & PLX_PCIE) {
3674                 u32 fsmvalue;
3675                 u32 usbstat;
3676                 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3677                                                         (base + 0x00b4);
3678                 dev->llregs = (struct usb338x_ll_regs __iomem *)
3679                                                         (base + 0x0700);
3680                 dev->ll_lfps_regs = (struct usb338x_ll_lfps_regs __iomem *)
3681                                                         (base + 0x0748);
3682                 dev->ll_tsn_regs = (struct usb338x_ll_tsn_regs __iomem *)
3683                                                         (base + 0x077c);
3684                 dev->ll_chicken_reg = (struct usb338x_ll_chi_regs __iomem *)
3685                                                         (base + 0x079c);
3686                 dev->plregs = (struct usb338x_pl_regs __iomem *)
3687                                                         (base + 0x0800);
3688                 usbstat = readl(&dev->usb->usbstat);
3689                 dev->enhanced_mode = !!(usbstat & BIT(11));
3690                 dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3691                 /* put into initial config, link up all endpoints */
3692                 fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3693                                         (0xf << DEFECT7374_FSM_FIELD);
3694                 /* See if firmware needs to set up for workaround: */
3695                 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3696                         dev->bug7734_patched = 1;
3697                         writel(0, &dev->usb->usbctl);
3698                 } else
3699                         dev->bug7734_patched = 0;
3700         } else {
3701                 dev->enhanced_mode = 0;
3702                 dev->n_ep = 7;
3703                 /* put into initial config, link up all endpoints */
3704                 writel(0, &dev->usb->usbctl);
3705         }
3706
3707         usb_reset(dev);
3708         usb_reinit(dev);
3709
3710         /* irq setup after old hardware is cleaned up */
3711         if (!pdev->irq) {
3712                 ep_err(dev, "No IRQ.  Check PCI setup!\n");
3713                 retval = -ENODEV;
3714                 goto done;
3715         }
3716
3717         if (dev->quirks & PLX_PCIE)
3718                 if (pci_enable_msi(pdev))
3719                         ep_err(dev, "Failed to enable MSI mode\n");
3720
3721         if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3722                                                         driver_name, dev)) {
3723                 ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3724                 retval = -EBUSY;
3725                 goto done;
3726         }
3727         dev->got_irq = 1;
3728
3729         /* DMA setup */
3730         /* NOTE:  we know only the 32 LSBs of dma addresses may be nonzero */
3731         dev->requests = dma_pool_create("requests", &pdev->dev,
3732                 sizeof(struct net2280_dma),
3733                 0 /* no alignment requirements */,
3734                 0 /* or page-crossing issues */);
3735         if (!dev->requests) {
3736                 ep_dbg(dev, "can't get request pool\n");
3737                 retval = -ENOMEM;
3738                 goto done;
3739         }
3740         for (i = 1; i < 5; i++) {
3741                 struct net2280_dma      *td;
3742
3743                 td = dma_pool_alloc(dev->requests, GFP_KERNEL,
3744                                 &dev->ep[i].td_dma);
3745                 if (!td) {
3746                         ep_dbg(dev, "can't get dummy %d\n", i);
3747                         retval = -ENOMEM;
3748                         goto done;
3749                 }
3750                 td->dmacount = 0;       /* not VALID */
3751                 td->dmadesc = td->dmaaddr;
3752                 dev->ep[i].dummy = td;
3753         }
3754
3755         /* enable lower-overhead pci memory bursts during DMA */
3756         if (dev->quirks & PLX_LEGACY)
3757                 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3758                         /*
3759                          * 256 write retries may not be enough...
3760                            BIT(PCI_RETRY_ABORT_ENABLE) |
3761                         */
3762                         BIT(DMA_READ_MULTIPLE_ENABLE) |
3763                         BIT(DMA_READ_LINE_ENABLE),
3764                         &dev->pci->pcimstctl);
3765         /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3766         pci_set_master(pdev);
3767         pci_try_set_mwi(pdev);
3768
3769         /* ... also flushes any posted pci writes */
3770         dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3771
3772         /* done */
3773         ep_info(dev, "%s\n", driver_desc);
3774         ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3775                         pdev->irq, base, dev->chiprev);
3776         ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3777                 dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3778         retval = device_create_file(&pdev->dev, &dev_attr_registers);
3779         if (retval)
3780                 goto done;
3781
3782         retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
3783                         gadget_release);
3784         if (retval)
3785                 goto done;
3786         return 0;
3787
3788 done:
3789         if (dev) {
3790                 net2280_remove(pdev);
3791                 kfree(dev);
3792         }
3793         return retval;
3794 }
3795
3796 /* make sure the board is quiescent; otherwise it will continue
3797  * generating IRQs across the upcoming reboot.
3798  */
3799
3800 static void net2280_shutdown(struct pci_dev *pdev)
3801 {
3802         struct net2280          *dev = pci_get_drvdata(pdev);
3803
3804         /* disable IRQs */
3805         writel(0, &dev->regs->pciirqenb0);
3806         writel(0, &dev->regs->pciirqenb1);
3807
3808         /* disable the pullup so the host will think we're gone */
3809         writel(0, &dev->usb->usbctl);
3810
3811 }
3812
3813
3814 /*-------------------------------------------------------------------------*/
3815
3816 static const struct pci_device_id pci_ids[] = { {
3817         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3818         .class_mask =   ~0,
3819         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3820         .device =       0x2280,
3821         .subvendor =    PCI_ANY_ID,
3822         .subdevice =    PCI_ANY_ID,
3823         .driver_data =  PLX_LEGACY | PLX_2280,
3824         }, {
3825         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3826         .class_mask =   ~0,
3827         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3828         .device =       0x2282,
3829         .subvendor =    PCI_ANY_ID,
3830         .subdevice =    PCI_ANY_ID,
3831         .driver_data =  PLX_LEGACY,
3832         },
3833         {
3834         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3835         .class_mask =   ~0,
3836         .vendor =       PCI_VENDOR_ID_PLX,
3837         .device =       0x2380,
3838         .subvendor =    PCI_ANY_ID,
3839         .subdevice =    PCI_ANY_ID,
3840         .driver_data =  PLX_PCIE,
3841          },
3842         {
3843         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3844         .class_mask =   ~0,
3845         .vendor =       PCI_VENDOR_ID_PLX,
3846         .device =       0x3380,
3847         .subvendor =    PCI_ANY_ID,
3848         .subdevice =    PCI_ANY_ID,
3849         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3850          },
3851         {
3852         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3853         .class_mask =   ~0,
3854         .vendor =       PCI_VENDOR_ID_PLX,
3855         .device =       0x3382,
3856         .subvendor =    PCI_ANY_ID,
3857         .subdevice =    PCI_ANY_ID,
3858         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3859          },
3860 { /* end: all zeroes */ }
3861 };
3862 MODULE_DEVICE_TABLE(pci, pci_ids);
3863
3864 /* pci driver glue; this is a "new style" PCI driver module */
3865 static struct pci_driver net2280_pci_driver = {
3866         .name =         (char *) driver_name,
3867         .id_table =     pci_ids,
3868
3869         .probe =        net2280_probe,
3870         .remove =       net2280_remove,
3871         .shutdown =     net2280_shutdown,
3872
3873         /* FIXME add power management support */
3874 };
3875
3876 module_pci_driver(net2280_pci_driver);
3877
3878 MODULE_DESCRIPTION(DRIVER_DESC);
3879 MODULE_AUTHOR("David Brownell");
3880 MODULE_LICENSE("GPL");