drivers/usb/gadget/udc/net2280.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for the PLX NET2280 USB device controller.
   4  * Specs and errata are available from <http://www.plxtech.com>.
   5  *
   6  * PLX Technology Inc. (formerly NetChip Technology) supported the
   7  * development of this driver.
   8  *
   9  *
  10  * CODE STATUS HIGHLIGHTS
  11  *
  12  * This driver should work well with most "gadget" drivers, including
  13  * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
  14  * as well as Gadget Zero and Gadgetfs.
  15  *
  16  * DMA is enabled by default.
  17  *
  18  * MSI is enabled by default.  The legacy IRQ is used if MSI couldn't
  19  * be enabled.
  20  *
  21  * Note that almost all the errata workarounds here are only needed for
  22  * rev1 chips.  Rev1a silicon (0110) fixes almost all of them.
  23  */
  24
  25 /*
  26  * Copyright (C) 2003 David Brownell
  27  * Copyright (C) 2003-2005 PLX Technology, Inc.
  28  * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
  29  *
  30  * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
  31  *      with 2282 chip
  32  *
  33  * Modified Ricardo Ribalda Qtechnology AS  to provide compatibility
  34  *      with usb 338x chip. Based on PLX driver
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/pci.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/kernel.h>
  41 #include <linux/delay.h>
  42 #include <linux/ioport.h>
  43 #include <linux/slab.h>
  44 #include <linux/errno.h>
  45 #include <linux/init.h>
  46 #include <linux/timer.h>
  47 #include <linux/list.h>
  48 #include <linux/interrupt.h>
  49 #include <linux/moduleparam.h>
  50 #include <linux/device.h>
  51 #include <linux/usb/ch9.h>
  52 #include <linux/usb/gadget.h>
  53 #include <linux/prefetch.h>
  54 #include <linux/io.h>
  55 #include <linux/iopoll.h>
  56
  57 #include <asm/byteorder.h>
  58 #include <asm/irq.h>
  59 #include <asm/unaligned.h>
  60
  61 #define DRIVER_DESC             "PLX NET228x/USB338x USB Peripheral Controller"
  62 #define DRIVER_VERSION          "2005 Sept 27/v3.0"
  63
  64 #define EP_DONTUSE              13      /* nonzero */
  65
  66 #define USE_RDK_LEDS            /* GPIO pins control three LEDs */
  67
  68
  69 static const char driver_name[] = "net2280";
  70 static const char driver_desc[] = DRIVER_DESC;
  71
  72 static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
  73 static const char ep0name[] = "ep0";
  74
  75 #define EP_INFO(_name, _caps) \
  76         { \
  77                 .name = _name, \
  78                 .caps = _caps, \
  79         }
  80
  81 static const struct {
  82         const char *name;
  83         const struct usb_ep_caps caps;
  84 } ep_info_dft[] = { /* Default endpoint configuration */
  85         EP_INFO(ep0name,
  86                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
  87         EP_INFO("ep-a",
  88                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  89         EP_INFO("ep-b",
  90                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  91         EP_INFO("ep-c",
  92                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  93         EP_INFO("ep-d",
  94                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  95         EP_INFO("ep-e",
  96                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  97         EP_INFO("ep-f",
  98                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  99         EP_INFO("ep-g",
 100                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 101         EP_INFO("ep-h",
 102                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 103 }, ep_info_adv[] = { /* Endpoints for usb3380 advance mode */
 104         EP_INFO(ep0name,
 105                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
 106         EP_INFO("ep1in",
 107                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 108         EP_INFO("ep2out",
 109                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 110         EP_INFO("ep3in",
 111                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 112         EP_INFO("ep4out",
 113                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 114         EP_INFO("ep1out",
 115                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 116         EP_INFO("ep2in",
 117                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 118         EP_INFO("ep3out",
 119                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 120         EP_INFO("ep4in",
 121                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 122 };
 123
 124 #undef EP_INFO
 125
 126 /* mode 0 == ep-{a,b,c,d} 1K fifo each
 127  * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
 128  * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
 129  */
 130 static ushort fifo_mode;
 131
 132 /* "modprobe net2280 fifo_mode=1" etc */
 133 module_param(fifo_mode, ushort, 0644);
 134
 135 /* enable_suspend -- When enabled, the driver will respond to
 136  * USB suspend requests by powering down the NET2280.  Otherwise,
 137  * USB suspend requests will be ignored.  This is acceptable for
 138  * self-powered devices
 139  */
 140 static bool enable_suspend;
 141
 142 /* "modprobe net2280 enable_suspend=1" etc */
 143 module_param(enable_suspend, bool, 0444);
 144
 145 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
 146
 147 static char *type_string(u8 bmAttributes)
 148 {
 149         switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
 150         case USB_ENDPOINT_XFER_BULK:    return "bulk";
 151         case USB_ENDPOINT_XFER_ISOC:    return "iso";
 152         case USB_ENDPOINT_XFER_INT:     return "intr";
 153         }
 154         return "control";
 155 }
 156
 157 #include "net2280.h"
 158
 159 #define valid_bit       cpu_to_le32(BIT(VALID_BIT))
 160 #define dma_done_ie     cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
 161
 162 static void ep_clear_seqnum(struct net2280_ep *ep);
 163 static void stop_activity(struct net2280 *dev,
 164                                         struct usb_gadget_driver *driver);
 165 static void ep0_start(struct net2280 *dev);
 166
 167 /*-------------------------------------------------------------------------*/
 168 static inline void enable_pciirqenb(struct net2280_ep *ep)
 169 {
 170         u32 tmp = readl(&ep->dev->regs->pciirqenb0);
 171
 172         if (ep->dev->quirks & PLX_LEGACY)
 173                 tmp |= BIT(ep->num);
 174         else
 175                 tmp |= BIT(ep_bit[ep->num]);
 176         writel(tmp, &ep->dev->regs->pciirqenb0);
 177
 178         return;
 179 }
 180
 181 static int
 182 net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 183 {
 184         struct net2280          *dev;
 185         struct net2280_ep       *ep;
 186         u32                     max;
 187         u32 tmp = 0;
 188         u32 type;
 189         unsigned long           flags;
 190         static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
 191         int ret = 0;
 192
 193         ep = container_of(_ep, struct net2280_ep, ep);
 194         if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
 195                         desc->bDescriptorType != USB_DT_ENDPOINT) {
 196                 pr_err("%s: failed at line=%d\n", __func__, __LINE__);
 197                 return -EINVAL;
 198         }
 199         dev = ep->dev;
 200         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 201                 ret = -ESHUTDOWN;
 202                 goto print_err;
 203         }
 204
 205         /* erratum 0119 workaround ties up an endpoint number */
 206         if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
 207                 ret = -EDOM;
 208                 goto print_err;
 209         }
 210
 211         if (dev->quirks & PLX_PCIE) {
 212                 if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
 213                         ret = -EDOM;
 214                         goto print_err;
 215                 }
 216                 ep->is_in = !!usb_endpoint_dir_in(desc);
 217                 if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
 218                         ret = -EINVAL;
 219                         goto print_err;
 220                 }
 221         }
 222
 223         /* sanity check ep-e/ep-f since their fifos are small */
 224         max = usb_endpoint_maxp(desc);
 225         if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
 226                 ret = -ERANGE;
 227                 goto print_err;
 228         }
 229
 230         spin_lock_irqsave(&dev->lock, flags);
 231         _ep->maxpacket = max;
 232         ep->desc = desc;
 233
 234         /* ep_reset() has already been called */
 235         ep->stopped = 0;
 236         ep->wedged = 0;
 237         ep->out_overflow = 0;
 238
 239         /* set speed-dependent max packet; may kick in high bandwidth */
 240         set_max_speed(ep, max);
 241
 242         /* set type, direction, address; reset fifo counters */
 243         writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
 244
 245         if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
 246                 tmp = readl(&ep->cfg->ep_cfg);
 247                 /* If USB ep number doesn't match hardware ep number */
 248                 if ((tmp & 0xf) != usb_endpoint_num(desc)) {
 249                         ret = -EINVAL;
 250                         spin_unlock_irqrestore(&dev->lock, flags);
 251                         goto print_err;
 252                 }
 253                 if (ep->is_in)
 254                         tmp &= ~USB3380_EP_CFG_MASK_IN;
 255                 else
 256                         tmp &= ~USB3380_EP_CFG_MASK_OUT;
 257         }
 258         type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 259         if (type == USB_ENDPOINT_XFER_INT) {
 260                 /* erratum 0105 workaround prevents hs NYET */
 261                 if (dev->chiprev == 0100 &&
 262                                 dev->gadget.speed == USB_SPEED_HIGH &&
 263                                 !(desc->bEndpointAddress & USB_DIR_IN))
 264                         writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
 265                                 &ep->regs->ep_rsp);
 266         } else if (type == USB_ENDPOINT_XFER_BULK) {
 267                 /* catch some particularly blatant driver bugs */
 268                 if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
 269                     (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
 270                     (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
 271                         spin_unlock_irqrestore(&dev->lock, flags);
 272                         ret = -ERANGE;
 273                         goto print_err;
 274                 }
 275         }
 276         ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC);
 277         /* Enable this endpoint */
 278         if (dev->quirks & PLX_LEGACY) {
 279                 tmp |= type << ENDPOINT_TYPE;
 280                 tmp |= desc->bEndpointAddress;
 281                 /* default full fifo lines */
 282                 tmp |= (4 << ENDPOINT_BYTE_COUNT);
 283                 tmp |= BIT(ENDPOINT_ENABLE);
 284                 ep->is_in = (tmp & USB_DIR_IN) != 0;
 285         } else {
 286                 /* In Legacy mode, only OUT endpoints are used */
 287                 if (dev->enhanced_mode && ep->is_in) {
 288                         tmp |= type << IN_ENDPOINT_TYPE;
 289                         tmp |= BIT(IN_ENDPOINT_ENABLE);
 290                 } else {
 291                         tmp |= type << OUT_ENDPOINT_TYPE;
 292                         tmp |= BIT(OUT_ENDPOINT_ENABLE);
 293                         tmp |= (ep->is_in << ENDPOINT_DIRECTION);
 294                 }
 295
 296                 tmp |= (4 << ENDPOINT_BYTE_COUNT);
 297                 if (!dev->enhanced_mode)
 298                         tmp |= usb_endpoint_num(desc);
 299                 tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
 300         }
 301
 302         /* Make sure all the registers are written before ep_rsp*/
 303         wmb();
 304
 305         /* for OUT transfers, block the rx fifo until a read is posted */
 306         if (!ep->is_in)
 307                 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 308         else if (!(dev->quirks & PLX_2280)) {
 309                 /* Added for 2282, Don't use nak packets on an in endpoint,
 310                  * this was ignored on 2280
 311                  */
 312                 writel(BIT(CLEAR_NAK_OUT_PACKETS) |
 313                         BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
 314         }
 315
 316         if (dev->quirks & PLX_PCIE)
 317                 ep_clear_seqnum(ep);
 318         writel(tmp, &ep->cfg->ep_cfg);
 319
 320         /* enable irqs */
 321         if (!ep->dma) {                         /* pio, per-packet */
 322                 enable_pciirqenb(ep);
 323
 324                 tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
 325                         BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
 326                 if (dev->quirks & PLX_2280)
 327                         tmp |= readl(&ep->regs->ep_irqenb);
 328                 writel(tmp, &ep->regs->ep_irqenb);
 329         } else {                                /* dma, per-request */
 330                 tmp = BIT((8 + ep->num));       /* completion */
 331                 tmp |= readl(&dev->regs->pciirqenb1);
 332                 writel(tmp, &dev->regs->pciirqenb1);
 333
 334                 /* for short OUT transfers, dma completions can't
 335                  * advance the queue; do it pio-style, by hand.
 336                  * NOTE erratum 0112 workaround #2
 337                  */
 338                 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
 339                         tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
 340                         writel(tmp, &ep->regs->ep_irqenb);
 341
 342                         enable_pciirqenb(ep);
 343                 }
 344         }
 345
 346         tmp = desc->bEndpointAddress;
 347         ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
 348                 _ep->name, tmp & 0x0f, DIR_STRING(tmp),
 349                 type_string(desc->bmAttributes),
 350                 ep->dma ? "dma" : "pio", max);
 351
 352         /* pci writes may still be posted */
 353         spin_unlock_irqrestore(&dev->lock, flags);
 354         return ret;
 355
 356 print_err:
 357         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
 358         return ret;
 359 }
 360
 361 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
 362 {
 363         u32     result;
 364         int     ret;
 365
 366         ret = readl_poll_timeout_atomic(ptr, result,
 367                                         ((result & mask) == done ||
 368                                          result == U32_MAX),
 369                                         1, usec);
 370         if (result == U32_MAX)          /* device unplugged */
 371                 return -ENODEV;
 372
 373         return ret;
 374 }
 375
 376 static const struct usb_ep_ops net2280_ep_ops;
 377
 378 static void ep_reset_228x(struct net2280_regs __iomem *regs,
 379                           struct net2280_ep *ep)
 380 {
 381         u32             tmp;
 382
 383         ep->desc = NULL;
 384         INIT_LIST_HEAD(&ep->queue);
 385
 386         usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 387         ep->ep.ops = &net2280_ep_ops;
 388
 389         /* disable the dma, irqs, endpoint... */
 390         if (ep->dma) {
 391                 writel(0, &ep->dma->dmactl);
 392                 writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 393                         BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
 394                         BIT(DMA_ABORT),
 395                         &ep->dma->dmastat);
 396
 397                 tmp = readl(&regs->pciirqenb0);
 398                 tmp &= ~BIT(ep->num);
 399                 writel(tmp, &regs->pciirqenb0);
 400         } else {
 401                 tmp = readl(&regs->pciirqenb1);
 402                 tmp &= ~BIT((8 + ep->num));     /* completion */
 403                 writel(tmp, &regs->pciirqenb1);
 404         }
 405         writel(0, &ep->regs->ep_irqenb);
 406
 407         /* init to our chosen defaults, notably so that we NAK OUT
 408          * packets until the driver queues a read (+note erratum 0112)
 409          */
 410         if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
 411                 tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
 412                 BIT(SET_NAK_OUT_PACKETS) |
 413                 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 414                 BIT(CLEAR_INTERRUPT_MODE);
 415         } else {
 416                 /* added for 2282 */
 417                 tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
 418                 BIT(CLEAR_NAK_OUT_PACKETS) |
 419                 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 420                 BIT(CLEAR_INTERRUPT_MODE);
 421         }
 422
 423         if (ep->num != 0) {
 424                 tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
 425                         BIT(CLEAR_ENDPOINT_HALT);
 426         }
 427         writel(tmp, &ep->regs->ep_rsp);
 428
 429         /* scrub most status bits, and flush any fifo state */
 430         if (ep->dev->quirks & PLX_2280)
 431                 tmp = BIT(FIFO_OVERFLOW) |
 432                         BIT(FIFO_UNDERFLOW);
 433         else
 434                 tmp = 0;
 435
 436         writel(tmp | BIT(TIMEOUT) |
 437                 BIT(USB_STALL_SENT) |
 438                 BIT(USB_IN_NAK_SENT) |
 439                 BIT(USB_IN_ACK_RCVD) |
 440                 BIT(USB_OUT_PING_NAK_SENT) |
 441                 BIT(USB_OUT_ACK_SENT) |
 442                 BIT(FIFO_FLUSH) |
 443                 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 444                 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 445                 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 446                 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 447                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 448                 BIT(DATA_IN_TOKEN_INTERRUPT),
 449                 &ep->regs->ep_stat);
 450
 451         /* fifo size is handled separately */
 452 }
 453
 454 static void ep_reset_338x(struct net2280_regs __iomem *regs,
 455                                         struct net2280_ep *ep)
 456 {
 457         u32 tmp, dmastat;
 458
 459         ep->desc = NULL;
 460         INIT_LIST_HEAD(&ep->queue);
 461
 462         usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 463         ep->ep.ops = &net2280_ep_ops;
 464
 465         /* disable the dma, irqs, endpoint... */
 466         if (ep->dma) {
 467                 writel(0, &ep->dma->dmactl);
 468                 writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
 469                        BIT(DMA_PAUSE_DONE_INTERRUPT) |
 470                        BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 471                        BIT(DMA_TRANSACTION_DONE_INTERRUPT),
 472                        /* | BIT(DMA_ABORT), */
 473                        &ep->dma->dmastat);
 474
 475                 dmastat = readl(&ep->dma->dmastat);
 476                 if (dmastat == 0x5002) {
 477                         ep_warn(ep->dev, "The dmastat return = %x!!\n",
 478                                dmastat);
 479                         writel(0x5a, &ep->dma->dmastat);
 480                 }
 481
 482                 tmp = readl(&regs->pciirqenb0);
 483                 tmp &= ~BIT(ep_bit[ep->num]);
 484                 writel(tmp, &regs->pciirqenb0);
 485         } else {
 486                 if (ep->num < 5) {
 487                         tmp = readl(&regs->pciirqenb1);
 488                         tmp &= ~BIT((8 + ep->num));     /* completion */
 489                         writel(tmp, &regs->pciirqenb1);
 490                 }
 491         }
 492         writel(0, &ep->regs->ep_irqenb);
 493
 494         writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 495                BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 496                BIT(FIFO_OVERFLOW) |
 497                BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 498                BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 499                BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 500                BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
 501
 502         tmp = readl(&ep->cfg->ep_cfg);
 503         if (ep->is_in)
 504                 tmp &= ~USB3380_EP_CFG_MASK_IN;
 505         else
 506                 tmp &= ~USB3380_EP_CFG_MASK_OUT;
 507         writel(tmp, &ep->cfg->ep_cfg);
 508 }
 509
 510 static void nuke(struct net2280_ep *);
 511
 512 static int net2280_disable(struct usb_ep *_ep)
 513 {
 514         struct net2280_ep       *ep;
 515         unsigned long           flags;
 516
 517         ep = container_of(_ep, struct net2280_ep, ep);
 518         if (!_ep || _ep->name == ep0name) {
 519                 pr_err("%s: Invalid ep=%p\n", __func__, _ep);
 520                 return -EINVAL;
 521         }
 522         spin_lock_irqsave(&ep->dev->lock, flags);
 523         nuke(ep);
 524
 525         if (ep->dev->quirks & PLX_PCIE)
 526                 ep_reset_338x(ep->dev->regs, ep);
 527         else
 528                 ep_reset_228x(ep->dev->regs, ep);
 529
 530         ep_vdbg(ep->dev, "disabled %s %s\n",
 531                         ep->dma ? "dma" : "pio", _ep->name);
 532
 533         /* synch memory views with the device */
 534         (void)readl(&ep->cfg->ep_cfg);
 535
 536         if (!ep->dma && ep->num >= 1 && ep->num <= 4)
 537                 ep->dma = &ep->dev->dma[ep->num - 1];
 538
 539         spin_unlock_irqrestore(&ep->dev->lock, flags);
 540         return 0;
 541 }
 542
 543 /*-------------------------------------------------------------------------*/
 544
 545 static struct usb_request
 546 *net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 547 {
 548         struct net2280_ep       *ep;
 549         struct net2280_request  *req;
 550
 551         if (!_ep) {
 552                 pr_err("%s: Invalid ep\n", __func__);
 553                 return NULL;
 554         }
 555         ep = container_of(_ep, struct net2280_ep, ep);
 556
 557         req = kzalloc(sizeof(*req), gfp_flags);
 558         if (!req)
 559                 return NULL;
 560
 561         INIT_LIST_HEAD(&req->queue);
 562
 563         /* this dma descriptor may be swapped with the previous dummy */
 564         if (ep->dma) {
 565                 struct net2280_dma      *td;
 566
 567                 td = dma_pool_alloc(ep->dev->requests, gfp_flags,
 568                                 &req->td_dma);
 569                 if (!td) {
 570                         kfree(req);
 571                         return NULL;
 572                 }
 573                 td->dmacount = 0;       /* not VALID */
 574                 td->dmadesc = td->dmaaddr;
 575                 req->td = td;
 576         }
 577         return &req->req;
 578 }
 579
 580 static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
 581 {
 582         struct net2280_ep       *ep;
 583         struct net2280_request  *req;
 584
 585         ep = container_of(_ep, struct net2280_ep, ep);
 586         if (!_ep || !_req) {
 587                 dev_err(&ep->dev->pdev->dev, "%s: Invalid ep=%p or req=%p\n",
 588                                                         __func__, _ep, _req);
 589                 return;
 590         }
 591
 592         req = container_of(_req, struct net2280_request, req);
 593         WARN_ON(!list_empty(&req->queue));
 594         if (req->td)
 595                 dma_pool_free(ep->dev->requests, req->td, req->td_dma);
 596         kfree(req);
 597 }
 598
 599 /*-------------------------------------------------------------------------*/
 600
 601 /* load a packet into the fifo we use for usb IN transfers.
 602  * works for all endpoints.
 603  *
 604  * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
 605  * at a time, but this code is simpler because it knows it only writes
 606  * one packet.  ep-a..ep-d should use dma instead.
 607  */
 608 static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
 609 {
 610         struct net2280_ep_regs  __iomem *regs = ep->regs;
 611         u8                      *buf;
 612         u32                     tmp;
 613         unsigned                count, total;
 614
 615         /* INVARIANT:  fifo is currently empty. (testable) */
 616
 617         if (req) {
 618                 buf = req->buf + req->actual;
 619                 prefetch(buf);
 620                 total = req->length - req->actual;
 621         } else {
 622                 total = 0;
 623                 buf = NULL;
 624         }
 625
 626         /* write just one packet at a time */
 627         count = ep->ep.maxpacket;
 628         if (count > total)      /* min() cannot be used on a bitfield */
 629                 count = total;
 630
 631         ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
 632                         ep->ep.name, count,
 633                         (count != ep->ep.maxpacket) ? " (short)" : "",
 634                         req);
 635         while (count >= 4) {
 636                 /* NOTE be careful if you try to align these. fifo lines
 637                  * should normally be full (4 bytes) and successive partial
 638                  * lines are ok only in certain cases.
 639                  */
 640                 tmp = get_unaligned((u32 *)buf);
 641                 cpu_to_le32s(&tmp);
 642                 writel(tmp, &regs->ep_data);
 643                 buf += 4;
 644                 count -= 4;
 645         }
 646
 647         /* last fifo entry is "short" unless we wrote a full packet.
 648          * also explicitly validate last word in (periodic) transfers
 649          * when maxpacket is not a multiple of 4 bytes.
 650          */
 651         if (count || total < ep->ep.maxpacket) {
 652                 tmp = count ? get_unaligned((u32 *)buf) : count;
 653                 cpu_to_le32s(&tmp);
 654                 set_fifo_bytecount(ep, count & 0x03);
 655                 writel(tmp, &regs->ep_data);
 656         }
 657
 658         /* pci writes may still be posted */
 659 }
 660
 661 /* work around erratum 0106: PCI and USB race over the OUT fifo.
 662  * caller guarantees chiprev 0100, out endpoint is NAKing, and
 663  * there's no real data in the fifo.
 664  *
 665  * NOTE:  also used in cases where that erratum doesn't apply:
 666  * where the host wrote "too much" data to us.
 667  */
 668 static void out_flush(struct net2280_ep *ep)
 669 {
 670         u32     __iomem *statp;
 671         u32     tmp;
 672
 673         statp = &ep->regs->ep_stat;
 674
 675         tmp = readl(statp);
 676         if (tmp & BIT(NAK_OUT_PACKETS)) {
 677                 ep_dbg(ep->dev, "%s %s %08x !NAK\n",
 678                         ep->ep.name, __func__, tmp);
 679                 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 680         }
 681
 682         writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 683                 BIT(DATA_PACKET_RECEIVED_INTERRUPT),
 684                 statp);
 685         writel(BIT(FIFO_FLUSH), statp);
 686         /* Make sure that stap is written */
 687         mb();
 688         tmp = readl(statp);
 689         if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
 690                         /* high speed did bulk NYET; fifo isn't filling */
 691                         ep->dev->gadget.speed == USB_SPEED_FULL) {
 692                 unsigned        usec;
 693
 694                 usec = 50;              /* 64 byte bulk/interrupt */
 695                 handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
 696                                 BIT(USB_OUT_PING_NAK_SENT), usec);
 697                 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
 698         }
 699 }
 700
 701 /* unload packet(s) from the fifo we use for usb OUT transfers.
 702  * returns true iff the request completed, because of short packet
 703  * or the request buffer having filled with full packets.
 704  *
 705  * for ep-a..ep-d this will read multiple packets out when they
 706  * have been accepted.
 707  */
 708 static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
 709 {
 710         struct net2280_ep_regs  __iomem *regs = ep->regs;
 711         u8                      *buf = req->req.buf + req->req.actual;
 712         unsigned                count, tmp, is_short;
 713         unsigned                cleanup = 0, prevent = 0;
 714
 715         /* erratum 0106 ... packets coming in during fifo reads might
 716          * be incompletely rejected.  not all cases have workarounds.
 717          */
 718         if (ep->dev->chiprev == 0x0100 &&
 719                         ep->dev->gadget.speed == USB_SPEED_FULL) {
 720                 udelay(1);
 721                 tmp = readl(&ep->regs->ep_stat);
 722                 if ((tmp & BIT(NAK_OUT_PACKETS)))
 723                         cleanup = 1;
 724                 else if ((tmp & BIT(FIFO_FULL))) {
 725                         start_out_naking(ep);
 726                         prevent = 1;
 727                 }
 728                 /* else: hope we don't see the problem */
 729         }
 730
 731         /* never overflow the rx buffer. the fifo reads packets until
 732          * it sees a short one; we might not be ready for them all.
 733          */
 734         prefetchw(buf);
 735         count = readl(&regs->ep_avail);
 736         if (unlikely(count == 0)) {
 737                 udelay(1);
 738                 tmp = readl(&ep->regs->ep_stat);
 739                 count = readl(&regs->ep_avail);
 740                 /* handled that data already? */
 741                 if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
 742                         return 0;
 743         }
 744
 745         tmp = req->req.length - req->req.actual;
 746         if (count > tmp) {
 747                 /* as with DMA, data overflow gets flushed */
 748                 if ((tmp % ep->ep.maxpacket) != 0) {
 749                         ep_err(ep->dev,
 750                                 "%s out fifo %d bytes, expected %d\n",
 751                                 ep->ep.name, count, tmp);
 752                         req->req.status = -EOVERFLOW;
 753                         cleanup = 1;
 754                         /* NAK_OUT_PACKETS will be set, so flushing is safe;
 755                          * the next read will start with the next packet
 756                          */
 757                 } /* else it's a ZLP, no worries */
 758                 count = tmp;
 759         }
 760         req->req.actual += count;
 761
 762         is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
 763
 764         ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
 765                         ep->ep.name, count, is_short ? " (short)" : "",
 766                         cleanup ? " flush" : "", prevent ? " nak" : "",
 767                         req, req->req.actual, req->req.length);
 768
 769         while (count >= 4) {
 770                 tmp = readl(&regs->ep_data);
 771                 cpu_to_le32s(&tmp);
 772                 put_unaligned(tmp, (u32 *)buf);
 773                 buf += 4;
 774                 count -= 4;
 775         }
 776         if (count) {
 777                 tmp = readl(&regs->ep_data);
 778                 /* LE conversion is implicit here: */
 779                 do {
 780                         *buf++ = (u8) tmp;
 781                         tmp >>= 8;
 782                 } while (--count);
 783         }
 784         if (cleanup)
 785                 out_flush(ep);
 786         if (prevent) {
 787                 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 788                 (void) readl(&ep->regs->ep_rsp);
 789         }
 790
 791         return is_short || req->req.actual == req->req.length;
 792 }
 793
 794 /* fill out dma descriptor to match a given request */
 795 static void fill_dma_desc(struct net2280_ep *ep,
 796                                         struct net2280_request *req, int valid)
 797 {
 798         struct net2280_dma      *td = req->td;
 799         u32                     dmacount = req->req.length;
 800
 801         /* don't let DMA continue after a short OUT packet,
 802          * so overruns can't affect the next transfer.
 803          * in case of overruns on max-size packets, we can't
 804          * stop the fifo from filling but we can flush it.
 805          */
 806         if (ep->is_in)
 807                 dmacount |= BIT(DMA_DIRECTION);
 808         if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
 809                                         !(ep->dev->quirks & PLX_2280))
 810                 dmacount |= BIT(END_OF_CHAIN);
 811
 812         req->valid = valid;
 813         if (valid)
 814                 dmacount |= BIT(VALID_BIT);
 815         dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
 816
 817         /* td->dmadesc = previously set by caller */
 818         td->dmaaddr = cpu_to_le32 (req->req.dma);
 819
 820         /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
 821         wmb();
 822         td->dmacount = cpu_to_le32(dmacount);
 823 }
 824
 825 static const u32 dmactl_default =
 826                 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 827                 BIT(DMA_CLEAR_COUNT_ENABLE) |
 828                 /* erratum 0116 workaround part 1 (use POLLING) */
 829                 (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
 830                 BIT(DMA_VALID_BIT_POLLING_ENABLE) |
 831                 BIT(DMA_VALID_BIT_ENABLE) |
 832                 BIT(DMA_SCATTER_GATHER_ENABLE) |
 833                 /* erratum 0116 workaround part 2 (no AUTOSTART) */
 834                 BIT(DMA_ENABLE);
 835
 836 static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
 837 {
 838         handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
 839 }
 840
 841 static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
 842 {
 843         writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
 844         spin_stop_dma(dma);
 845 }
 846
 847 static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
 848 {
 849         struct net2280_dma_regs __iomem *dma = ep->dma;
 850         unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
 851
 852         if (!(ep->dev->quirks & PLX_2280))
 853                 tmp |= BIT(END_OF_CHAIN);
 854
 855         writel(tmp, &dma->dmacount);
 856         writel(readl(&dma->dmastat), &dma->dmastat);
 857
 858         writel(td_dma, &dma->dmadesc);
 859         if (ep->dev->quirks & PLX_PCIE)
 860                 dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
 861         writel(dmactl, &dma->dmactl);
 862
 863         /* erratum 0116 workaround part 3:  pci arbiter away from net2280 */
 864         (void) readl(&ep->dev->pci->pcimstctl);
 865
 866         writel(BIT(DMA_START), &dma->dmastat);
 867 }
 868
 869 static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
 870 {
 871         u32                     tmp;
 872         struct net2280_dma_regs __iomem *dma = ep->dma;
 873
 874         /* FIXME can't use DMA for ZLPs */
 875
 876         /* on this path we "know" there's no dma active (yet) */
 877         WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
 878         writel(0, &ep->dma->dmactl);
 879
 880         /* previous OUT packet might have been short */
 881         if (!ep->is_in && (readl(&ep->regs->ep_stat) &
 882                                 BIT(NAK_OUT_PACKETS))) {
 883                 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
 884                         &ep->regs->ep_stat);
 885
 886                 tmp = readl(&ep->regs->ep_avail);
 887                 if (tmp) {
 888                         writel(readl(&dma->dmastat), &dma->dmastat);
 889
 890                         /* transfer all/some fifo data */
 891                         writel(req->req.dma, &dma->dmaaddr);
 892                         tmp = min(tmp, req->req.length);
 893
 894                         /* dma irq, faking scatterlist status */
 895                         req->td->dmacount = cpu_to_le32(req->req.length - tmp);
 896                         writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
 897                                         &dma->dmacount);
 898                         req->td->dmadesc = 0;
 899                         req->valid = 1;
 900
 901                         writel(BIT(DMA_ENABLE), &dma->dmactl);
 902                         writel(BIT(DMA_START), &dma->dmastat);
 903                         return;
 904                 }
 905                 stop_out_naking(ep);
 906         }
 907
 908         tmp = dmactl_default;
 909
 910         /* force packet boundaries between dma requests, but prevent the
 911          * controller from automagically writing a last "short" packet
 912          * (zero length) unless the driver explicitly said to do that.
 913          */
 914         if (ep->is_in) {
 915                 if (likely((req->req.length % ep->ep.maxpacket) ||
 916                                                         req->req.zero)){
 917                         tmp |= BIT(DMA_FIFO_VALIDATE);
 918                         ep->in_fifo_validate = 1;
 919                 } else
 920                         ep->in_fifo_validate = 0;
 921         }
 922
 923         /* init req->td, pointing to the current dummy */
 924         req->td->dmadesc = cpu_to_le32 (ep->td_dma);
 925         fill_dma_desc(ep, req, 1);
 926
 927         req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
 928
 929         start_queue(ep, tmp, req->td_dma);
 930 }
 931
 932 static inline void
 933 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
 934 {
 935         struct net2280_dma      *end;
 936         dma_addr_t              tmp;
 937
 938         /* swap new dummy for old, link; fill and maybe activate */
 939         end = ep->dummy;
 940         ep->dummy = req->td;
 941         req->td = end;
 942
 943         tmp = ep->td_dma;
 944         ep->td_dma = req->td_dma;
 945         req->td_dma = tmp;
 946
 947         end->dmadesc = cpu_to_le32 (ep->td_dma);
 948
 949         fill_dma_desc(ep, req, valid);
 950 }
 951
 952 static void
 953 done(struct net2280_ep *ep, struct net2280_request *req, int status)
 954 {
 955         struct net2280          *dev;
 956         unsigned                stopped = ep->stopped;
 957
 958         list_del_init(&req->queue);
 959
 960         if (req->req.status == -EINPROGRESS)
 961                 req->req.status = status;
 962         else
 963                 status = req->req.status;
 964
 965         dev = ep->dev;
 966         if (ep->dma)
 967                 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
 968
 969         if (status && status != -ESHUTDOWN)
 970                 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
 971                         ep->ep.name, &req->req, status,
 972                         req->req.actual, req->req.length);
 973
 974         /* don't modify queue heads during completion callback */
 975         ep->stopped = 1;
 976         spin_unlock(&dev->lock);
 977         usb_gadget_giveback_request(&ep->ep, &req->req);
 978         spin_lock(&dev->lock);
 979         ep->stopped = stopped;
 980 }
 981
 982 /*-------------------------------------------------------------------------*/
 983
 984 static int
 985 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 986 {
 987         struct net2280_request  *req;
 988         struct net2280_ep       *ep;
 989         struct net2280          *dev;
 990         unsigned long           flags;
 991         int ret = 0;
 992
 993         /* we always require a cpu-view buffer, so that we can
 994          * always use pio (as fallback or whatever).
 995          */
 996         ep = container_of(_ep, struct net2280_ep, ep);
 997         if (!_ep || (!ep->desc && ep->num != 0)) {
 998                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
 999                 return -EINVAL;
1000         }
1001         req = container_of(_req, struct net2280_request, req);
1002         if (!_req || !_req->complete || !_req->buf ||
1003                                 !list_empty(&req->queue)) {
1004                 ret = -EINVAL;
1005                 goto print_err;
1006         }
1007         if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
1008                 ret = -EDOM;
1009                 goto print_err;
1010         }
1011         dev = ep->dev;
1012         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1013                 ret = -ESHUTDOWN;
1014                 goto print_err;
1015         }
1016
1017         /* FIXME implement PIO fallback for ZLPs with DMA */
1018         if (ep->dma && _req->length == 0) {
1019                 ret = -EOPNOTSUPP;
1020                 goto print_err;
1021         }
1022
1023         /* set up dma mapping in case the caller didn't */
1024         if (ep->dma) {
1025                 ret = usb_gadget_map_request(&dev->gadget, _req,
1026                                 ep->is_in);
1027                 if (ret)
1028                         goto print_err;
1029         }
1030
1031         ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
1032                         _ep->name, _req, _req->length, _req->buf);
1033
1034         spin_lock_irqsave(&dev->lock, flags);
1035
1036         _req->status = -EINPROGRESS;
1037         _req->actual = 0;
1038
1039         /* kickstart this i/o queue? */
1040         if  (list_empty(&ep->queue) && !ep->stopped &&
1041                 !((dev->quirks & PLX_PCIE) && ep->dma &&
1042                   (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1043
1044                 /* use DMA if the endpoint supports it, else pio */
1045                 if (ep->dma)
1046                         start_dma(ep, req);
1047                 else {
1048                         /* maybe there's no control data, just status ack */
1049                         if (ep->num == 0 && _req->length == 0) {
1050                                 allow_status(ep);
1051                                 done(ep, req, 0);
1052                                 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1053                                 goto done;
1054                         }
1055
1056                         /* PIO ... stuff the fifo, or unblock it.  */
1057                         if (ep->is_in)
1058                                 write_fifo(ep, _req);
1059                         else {
1060                                 u32     s;
1061
1062                                 /* OUT FIFO might have packet(s) buffered */
1063                                 s = readl(&ep->regs->ep_stat);
1064                                 if ((s & BIT(FIFO_EMPTY)) == 0) {
1065                                         /* note:  _req->short_not_ok is
1066                                          * ignored here since PIO _always_
1067                                          * stops queue advance here, and
1068                                          * _req->status doesn't change for
1069                                          * short reads (only _req->actual)
1070                                          */
1071                                         if (read_fifo(ep, req) &&
1072                                                         ep->num == 0) {
1073                                                 done(ep, req, 0);
1074                                                 allow_status(ep);
1075                                                 /* don't queue it */
1076                                                 req = NULL;
1077                                         } else if (read_fifo(ep, req) &&
1078                                                         ep->num != 0) {
1079                                                 done(ep, req, 0);
1080                                                 req = NULL;
1081                                         } else
1082                                                 s = readl(&ep->regs->ep_stat);
1083                                 }
1084
1085                                 /* don't NAK, let the fifo fill */
1086                                 if (req && (s & BIT(NAK_OUT_PACKETS)))
1087                                         writel(BIT(CLEAR_NAK_OUT_PACKETS),
1088                                                         &ep->regs->ep_rsp);
1089                         }
1090                 }
1091
1092         } else if (ep->dma) {
1093                 int     valid = 1;
1094
1095                 if (ep->is_in) {
1096                         int     expect;
1097
1098                         /* preventing magic zlps is per-engine state, not
1099                          * per-transfer; irq logic must recover hiccups.
1100                          */
1101                         expect = likely(req->req.zero ||
1102                                 (req->req.length % ep->ep.maxpacket));
1103                         if (expect != ep->in_fifo_validate)
1104                                 valid = 0;
1105                 }
1106                 queue_dma(ep, req, valid);
1107
1108         } /* else the irq handler advances the queue. */
1109
1110         ep->responded = 1;
1111         if (req)
1112                 list_add_tail(&req->queue, &ep->queue);
1113 done:
1114         spin_unlock_irqrestore(&dev->lock, flags);
1115
1116         /* pci writes may still be posted */
1117         return ret;
1118
1119 print_err:
1120         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1121         return ret;
1122 }
1123
1124 static inline void
1125 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1126                 int status)
1127 {
1128         req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1129         done(ep, req, status);
1130 }
1131
1132 static int scan_dma_completions(struct net2280_ep *ep)
1133 {
1134         int num_completed = 0;
1135
1136         /* only look at descriptors that were "naturally" retired,
1137          * so fifo and list head state won't matter
1138          */
1139         while (!list_empty(&ep->queue)) {
1140                 struct net2280_request  *req;
1141                 u32 req_dma_count;
1142
1143                 req = list_entry(ep->queue.next,
1144                                 struct net2280_request, queue);
1145                 if (!req->valid)
1146                         break;
1147                 rmb();
1148                 req_dma_count = le32_to_cpup(&req->td->dmacount);
1149                 if ((req_dma_count & BIT(VALID_BIT)) != 0)
1150                         break;
1151
1152                 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1153                  * cases where DMA must be aborted; this code handles
1154                  * all non-abort DMA completions.
1155                  */
1156                 if (unlikely(req->td->dmadesc == 0)) {
1157                         /* paranoia */
1158                         u32 const ep_dmacount = readl(&ep->dma->dmacount);
1159
1160                         if (ep_dmacount & DMA_BYTE_COUNT_MASK)
1161                                 break;
1162                         /* single transfer mode */
1163                         dma_done(ep, req, req_dma_count, 0);
1164                         num_completed++;
1165                         break;
1166                 } else if (!ep->is_in &&
1167                            (req->req.length % ep->ep.maxpacket) &&
1168                            !(ep->dev->quirks & PLX_PCIE)) {
1169
1170                         u32 const ep_stat = readl(&ep->regs->ep_stat);
1171                         /* AVOID TROUBLE HERE by not issuing short reads from
1172                          * your gadget driver.  That helps avoids errata 0121,
1173                          * 0122, and 0124; not all cases trigger the warning.
1174                          */
1175                         if ((ep_stat & BIT(NAK_OUT_PACKETS)) == 0) {
1176                                 ep_warn(ep->dev, "%s lost packet sync!\n",
1177                                                 ep->ep.name);
1178                                 req->req.status = -EOVERFLOW;
1179                         } else {
1180                                 u32 const ep_avail = readl(&ep->regs->ep_avail);
1181                                 if (ep_avail) {
1182                                         /* fifo gets flushed later */
1183                                         ep->out_overflow = 1;
1184                                         ep_dbg(ep->dev,
1185                                                 "%s dma, discard %d len %d\n",
1186                                                 ep->ep.name, ep_avail,
1187                                                 req->req.length);
1188                                         req->req.status = -EOVERFLOW;
1189                                 }
1190                         }
1191                 }
1192                 dma_done(ep, req, req_dma_count, 0);
1193                 num_completed++;
1194         }
1195
1196         return num_completed;
1197 }
1198
1199 static void restart_dma(struct net2280_ep *ep)
1200 {
1201         struct net2280_request  *req;
1202
1203         if (ep->stopped)
1204                 return;
1205         req = list_entry(ep->queue.next, struct net2280_request, queue);
1206
1207         start_dma(ep, req);
1208 }
1209
1210 static void abort_dma(struct net2280_ep *ep)
1211 {
1212         /* abort the current transfer */
1213         if (likely(!list_empty(&ep->queue))) {
1214                 /* FIXME work around errata 0121, 0122, 0124 */
1215                 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1216                 spin_stop_dma(ep->dma);
1217         } else
1218                 stop_dma(ep->dma);
1219         scan_dma_completions(ep);
1220 }
1221
1222 /* dequeue ALL requests */
1223 static void nuke(struct net2280_ep *ep)
1224 {
1225         struct net2280_request  *req;
1226
1227         /* called with spinlock held */
1228         ep->stopped = 1;
1229         if (ep->dma)
1230                 abort_dma(ep);
1231         while (!list_empty(&ep->queue)) {
1232                 req = list_entry(ep->queue.next,
1233                                 struct net2280_request,
1234                                 queue);
1235                 done(ep, req, -ESHUTDOWN);
1236         }
1237 }
1238
1239 /* dequeue JUST ONE request */
1240 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1241 {
1242         struct net2280_ep       *ep;
1243         struct net2280_request  *req;
1244         unsigned long           flags;
1245         u32                     dmactl;
1246         int                     stopped;
1247
1248         ep = container_of(_ep, struct net2280_ep, ep);
1249         if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1250                 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1251                                                 __func__, _ep, _req);
1252                 return -EINVAL;
1253         }
1254
1255         spin_lock_irqsave(&ep->dev->lock, flags);
1256         stopped = ep->stopped;
1257
1258         /* quiesce dma while we patch the queue */
1259         dmactl = 0;
1260         ep->stopped = 1;
1261         if (ep->dma) {
1262                 dmactl = readl(&ep->dma->dmactl);
1263                 /* WARNING erratum 0127 may kick in ... */
1264                 stop_dma(ep->dma);
1265                 scan_dma_completions(ep);
1266         }
1267
1268         /* make sure it's still queued on this endpoint */
1269         list_for_each_entry(req, &ep->queue, queue) {
1270                 if (&req->req == _req)
1271                         break;
1272         }
1273         if (&req->req != _req) {
1274                 ep->stopped = stopped;
1275                 spin_unlock_irqrestore(&ep->dev->lock, flags);
1276                 ep_dbg(ep->dev, "%s: Request mismatch\n", __func__);
1277                 return -EINVAL;
1278         }
1279
1280         /* queue head may be partially complete. */
1281         if (ep->queue.next == &req->queue) {
1282                 if (ep->dma) {
1283                         ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1284                         _req->status = -ECONNRESET;
1285                         abort_dma(ep);
1286                         if (likely(ep->queue.next == &req->queue)) {
1287                                 /* NOTE: misreports single-transfer mode*/
1288                                 req->td->dmacount = 0;  /* invalidate */
1289                                 dma_done(ep, req,
1290                                         readl(&ep->dma->dmacount),
1291                                         -ECONNRESET);
1292                         }
1293                 } else {
1294                         ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1295                         done(ep, req, -ECONNRESET);
1296                 }
1297                 req = NULL;
1298         }
1299
1300         if (req)
1301                 done(ep, req, -ECONNRESET);
1302         ep->stopped = stopped;
1303
1304         if (ep->dma) {
1305                 /* turn off dma on inactive queues */
1306                 if (list_empty(&ep->queue))
1307                         stop_dma(ep->dma);
1308                 else if (!ep->stopped) {
1309                         /* resume current request, or start new one */
1310                         if (req)
1311                                 writel(dmactl, &ep->dma->dmactl);
1312                         else
1313                                 start_dma(ep, list_entry(ep->queue.next,
1314                                         struct net2280_request, queue));
1315                 }
1316         }
1317
1318         spin_unlock_irqrestore(&ep->dev->lock, flags);
1319         return 0;
1320 }
1321
1322 /*-------------------------------------------------------------------------*/
1323
1324 static int net2280_fifo_status(struct usb_ep *_ep);
1325
1326 static int
1327 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1328 {
1329         struct net2280_ep       *ep;
1330         unsigned long           flags;
1331         int                     retval = 0;
1332
1333         ep = container_of(_ep, struct net2280_ep, ep);
1334         if (!_ep || (!ep->desc && ep->num != 0)) {
1335                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1336                 return -EINVAL;
1337         }
1338         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1339                 retval = -ESHUTDOWN;
1340                 goto print_err;
1341         }
1342         if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1343                                                 == USB_ENDPOINT_XFER_ISOC) {
1344                 retval = -EINVAL;
1345                 goto print_err;
1346         }
1347
1348         spin_lock_irqsave(&ep->dev->lock, flags);
1349         if (!list_empty(&ep->queue)) {
1350                 retval = -EAGAIN;
1351                 goto print_unlock;
1352         } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1353                 retval = -EAGAIN;
1354                 goto print_unlock;
1355         } else {
1356                 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1357                                 value ? "set" : "clear",
1358                                 wedged ? "wedge" : "halt");
1359                 /* set/clear, then synch memory views with the device */
1360                 if (value) {
1361                         if (ep->num == 0)
1362                                 ep->dev->protocol_stall = 1;
1363                         else
1364                                 set_halt(ep);
1365                         if (wedged)
1366                                 ep->wedged = 1;
1367                 } else {
1368                         clear_halt(ep);
1369                         if (ep->dev->quirks & PLX_PCIE &&
1370                                 !list_empty(&ep->queue) && ep->td_dma)
1371                                         restart_dma(ep);
1372                         ep->wedged = 0;
1373                 }
1374                 (void) readl(&ep->regs->ep_rsp);
1375         }
1376         spin_unlock_irqrestore(&ep->dev->lock, flags);
1377
1378         return retval;
1379
1380 print_unlock:
1381         spin_unlock_irqrestore(&ep->dev->lock, flags);
1382 print_err:
1383         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1384         return retval;
1385 }
1386
1387 static int net2280_set_halt(struct usb_ep *_ep, int value)
1388 {
1389         return net2280_set_halt_and_wedge(_ep, value, 0);
1390 }
1391
1392 static int net2280_set_wedge(struct usb_ep *_ep)
1393 {
1394         if (!_ep || _ep->name == ep0name) {
1395                 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1396                 return -EINVAL;
1397         }
1398         return net2280_set_halt_and_wedge(_ep, 1, 1);
1399 }
1400
1401 static int net2280_fifo_status(struct usb_ep *_ep)
1402 {
1403         struct net2280_ep       *ep;
1404         u32                     avail;
1405
1406         ep = container_of(_ep, struct net2280_ep, ep);
1407         if (!_ep || (!ep->desc && ep->num != 0)) {
1408                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1409                 return -ENODEV;
1410         }
1411         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1412                 dev_err(&ep->dev->pdev->dev,
1413                         "%s: Invalid driver=%p or speed=%d\n",
1414                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1415                 return -ESHUTDOWN;
1416         }
1417
1418         avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1419         if (avail > ep->fifo_size) {
1420                 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1421                 return -EOVERFLOW;
1422         }
1423         if (ep->is_in)
1424                 avail = ep->fifo_size - avail;
1425         return avail;
1426 }
1427
1428 static void net2280_fifo_flush(struct usb_ep *_ep)
1429 {
1430         struct net2280_ep       *ep;
1431
1432         ep = container_of(_ep, struct net2280_ep, ep);
1433         if (!_ep || (!ep->desc && ep->num != 0)) {
1434                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1435                 return;
1436         }
1437         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1438                 dev_err(&ep->dev->pdev->dev,
1439                         "%s: Invalid driver=%p or speed=%d\n",
1440                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1441                 return;
1442         }
1443
1444         writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1445         (void) readl(&ep->regs->ep_rsp);
1446 }
1447
1448 static const struct usb_ep_ops net2280_ep_ops = {
1449         .enable         = net2280_enable,
1450         .disable        = net2280_disable,
1451
1452         .alloc_request  = net2280_alloc_request,
1453         .free_request   = net2280_free_request,
1454
1455         .queue          = net2280_queue,
1456         .dequeue        = net2280_dequeue,
1457
1458         .set_halt       = net2280_set_halt,
1459         .set_wedge      = net2280_set_wedge,
1460         .fifo_status    = net2280_fifo_status,
1461         .fifo_flush     = net2280_fifo_flush,
1462 };
1463
1464 /*-------------------------------------------------------------------------*/
1465
1466 static int net2280_get_frame(struct usb_gadget *_gadget)
1467 {
1468         struct net2280          *dev;
1469         unsigned long           flags;
1470         u16                     retval;
1471
1472         if (!_gadget)
1473                 return -ENODEV;
1474         dev = container_of(_gadget, struct net2280, gadget);
1475         spin_lock_irqsave(&dev->lock, flags);
1476         retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1477         spin_unlock_irqrestore(&dev->lock, flags);
1478         return retval;
1479 }
1480
1481 static int net2280_wakeup(struct usb_gadget *_gadget)
1482 {
1483         struct net2280          *dev;
1484         u32                     tmp;
1485         unsigned long           flags;
1486
1487         if (!_gadget)
1488                 return 0;
1489         dev = container_of(_gadget, struct net2280, gadget);
1490
1491         spin_lock_irqsave(&dev->lock, flags);
1492         tmp = readl(&dev->usb->usbctl);
1493         if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1494                 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1495         spin_unlock_irqrestore(&dev->lock, flags);
1496
1497         /* pci writes may still be posted */
1498         return 0;
1499 }
1500
1501 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1502 {
1503         struct net2280          *dev;
1504         u32                     tmp;
1505         unsigned long           flags;
1506
1507         if (!_gadget)
1508                 return 0;
1509         dev = container_of(_gadget, struct net2280, gadget);
1510
1511         spin_lock_irqsave(&dev->lock, flags);
1512         tmp = readl(&dev->usb->usbctl);
1513         if (value) {
1514                 tmp |= BIT(SELF_POWERED_STATUS);
1515                 _gadget->is_selfpowered = 1;
1516         } else {
1517                 tmp &= ~BIT(SELF_POWERED_STATUS);
1518                 _gadget->is_selfpowered = 0;
1519         }
1520         writel(tmp, &dev->usb->usbctl);
1521         spin_unlock_irqrestore(&dev->lock, flags);
1522
1523         return 0;
1524 }
1525
1526 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1527 {
1528         struct net2280  *dev;
1529         u32             tmp;
1530         unsigned long   flags;
1531
1532         if (!_gadget)
1533                 return -ENODEV;
1534         dev = container_of(_gadget, struct net2280, gadget);
1535
1536         spin_lock_irqsave(&dev->lock, flags);
1537         tmp = readl(&dev->usb->usbctl);
1538         dev->softconnect = (is_on != 0);
1539         if (is_on) {
1540                 ep0_start(dev);
1541                 writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1542         } else {
1543                 writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1544                 stop_activity(dev, NULL);
1545         }
1546
1547         spin_unlock_irqrestore(&dev->lock, flags);
1548
1549         return 0;
1550 }
1551
1552 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1553                 struct usb_endpoint_descriptor *desc,
1554                 struct usb_ss_ep_comp_descriptor *ep_comp)
1555 {
1556         char name[8];
1557         struct usb_ep *ep;
1558
1559         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1560                 /* ep-e, ep-f are PIO with only 64 byte fifos */
1561                 ep = gadget_find_ep_by_name(_gadget, "ep-e");
1562                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1563                         return ep;
1564                 ep = gadget_find_ep_by_name(_gadget, "ep-f");
1565                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1566                         return ep;
1567         }
1568
1569         /* USB3380: Only first four endpoints have DMA channels. Allocate
1570          * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc
1571          * endpoints use DMA hw endpoints.
1572          */
1573         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1574             usb_endpoint_dir_in(desc)) {
1575                 ep = gadget_find_ep_by_name(_gadget, "ep2in");
1576                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1577                         return ep;
1578                 ep = gadget_find_ep_by_name(_gadget, "ep4in");
1579                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1580                         return ep;
1581         } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1582                    !usb_endpoint_dir_in(desc)) {
1583                 ep = gadget_find_ep_by_name(_gadget, "ep1out");
1584                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1585                         return ep;
1586                 ep = gadget_find_ep_by_name(_gadget, "ep3out");
1587                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1588                         return ep;
1589         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1590                    usb_endpoint_dir_in(desc)) {
1591                 ep = gadget_find_ep_by_name(_gadget, "ep1in");
1592                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1593                         return ep;
1594                 ep = gadget_find_ep_by_name(_gadget, "ep3in");
1595                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1596                         return ep;
1597         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1598                    !usb_endpoint_dir_in(desc)) {
1599                 ep = gadget_find_ep_by_name(_gadget, "ep2out");
1600                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1601                         return ep;
1602                 ep = gadget_find_ep_by_name(_gadget, "ep4out");
1603                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1604                         return ep;
1605         }
1606
1607         /* USB3380: use same address for usb and hardware endpoints */
1608         snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1609                         usb_endpoint_dir_in(desc) ? "in" : "out");
1610         ep = gadget_find_ep_by_name(_gadget, name);
1611         if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1612                 return ep;
1613
1614         return NULL;
1615 }
1616
1617 static int net2280_start(struct usb_gadget *_gadget,
1618                 struct usb_gadget_driver *driver);
1619 static int net2280_stop(struct usb_gadget *_gadget);
1620
1621 static const struct usb_gadget_ops net2280_ops = {
1622         .get_frame      = net2280_get_frame,
1623         .wakeup         = net2280_wakeup,
1624         .set_selfpowered = net2280_set_selfpowered,
1625         .pullup         = net2280_pullup,
1626         .udc_start      = net2280_start,
1627         .udc_stop       = net2280_stop,
1628         .match_ep       = net2280_match_ep,
1629 };
1630
1631 /*-------------------------------------------------------------------------*/
1632
1633 #ifdef  CONFIG_USB_GADGET_DEBUG_FILES
1634
1635 /* FIXME move these into procfs, and use seq_file.
1636  * Sysfs _still_ doesn't behave for arbitrarily sized files,
1637  * and also doesn't help products using this with 2.4 kernels.
1638  */
1639
1640 /* "function" sysfs attribute */
1641 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1642                              char *buf)
1643 {
1644         struct net2280  *dev = dev_get_drvdata(_dev);
1645
1646         if (!dev->driver || !dev->driver->function ||
1647                         strlen(dev->driver->function) > PAGE_SIZE)
1648                 return 0;
1649         return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1650 }
1651 static DEVICE_ATTR_RO(function);
1652
1653 static ssize_t registers_show(struct device *_dev,
1654                               struct device_attribute *attr, char *buf)
1655 {
1656         struct net2280          *dev;
1657         char                    *next;
1658         unsigned                size, t;
1659         unsigned long           flags;
1660         int                     i;
1661         u32                     t1, t2;
1662         const char              *s;
1663
1664         dev = dev_get_drvdata(_dev);
1665         next = buf;
1666         size = PAGE_SIZE;
1667         spin_lock_irqsave(&dev->lock, flags);
1668
1669         if (dev->driver)
1670                 s = dev->driver->driver.name;
1671         else
1672                 s = "(none)";
1673
1674         /* Main Control Registers */
1675         t = scnprintf(next, size, "%s version " DRIVER_VERSION
1676                         ", chiprev %04x\n\n"
1677                         "devinit %03x fifoctl %08x gadget '%s'\n"
1678                         "pci irqenb0 %02x irqenb1 %08x "
1679                         "irqstat0 %04x irqstat1 %08x\n",
1680                         driver_name, dev->chiprev,
1681                         readl(&dev->regs->devinit),
1682                         readl(&dev->regs->fifoctl),
1683                         s,
1684                         readl(&dev->regs->pciirqenb0),
1685                         readl(&dev->regs->pciirqenb1),
1686                         readl(&dev->regs->irqstat0),
1687                         readl(&dev->regs->irqstat1));
1688         size -= t;
1689         next += t;
1690
1691         /* USB Control Registers */
1692         t1 = readl(&dev->usb->usbctl);
1693         t2 = readl(&dev->usb->usbstat);
1694         if (t1 & BIT(VBUS_PIN)) {
1695                 if (t2 & BIT(HIGH_SPEED))
1696                         s = "high speed";
1697                 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1698                         s = "powered";
1699                 else
1700                         s = "full speed";
1701                 /* full speed bit (6) not working?? */
1702         } else
1703                         s = "not attached";
1704         t = scnprintf(next, size,
1705                         "stdrsp %08x usbctl %08x usbstat %08x "
1706                                 "addr 0x%02x (%s)\n",
1707                         readl(&dev->usb->stdrsp), t1, t2,
1708                         readl(&dev->usb->ouraddr), s);
1709         size -= t;
1710         next += t;
1711
1712         /* PCI Master Control Registers */
1713
1714         /* DMA Control Registers */
1715
1716         /* Configurable EP Control Registers */
1717         for (i = 0; i < dev->n_ep; i++) {
1718                 struct net2280_ep       *ep;
1719
1720                 ep = &dev->ep[i];
1721                 if (i && !ep->desc)
1722                         continue;
1723
1724                 t1 = readl(&ep->cfg->ep_cfg);
1725                 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1726                 t = scnprintf(next, size,
1727                                 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1728                                         "irqenb %02x\n",
1729                                 ep->ep.name, t1, t2,
1730                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1731                                         ? "NAK " : "",
1732                                 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1733                                         ? "hide " : "",
1734                                 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1735                                         ? "CRC " : "",
1736                                 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1737                                         ? "interrupt " : "",
1738                                 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1739                                         ? "status " : "",
1740                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1741                                         ? "NAKmode " : "",
1742                                 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1743                                         ? "DATA1 " : "DATA0 ",
1744                                 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1745                                         ? "HALT " : "",
1746                                 readl(&ep->regs->ep_irqenb));
1747                 size -= t;
1748                 next += t;
1749
1750                 t = scnprintf(next, size,
1751                                 "\tstat %08x avail %04x "
1752                                 "(ep%d%s-%s)%s\n",
1753                                 readl(&ep->regs->ep_stat),
1754                                 readl(&ep->regs->ep_avail),
1755                                 t1 & 0x0f, DIR_STRING(t1),
1756                                 type_string(t1 >> 8),
1757                                 ep->stopped ? "*" : "");
1758                 size -= t;
1759                 next += t;
1760
1761                 if (!ep->dma)
1762                         continue;
1763
1764                 t = scnprintf(next, size,
1765                                 "  dma\tctl %08x stat %08x count %08x\n"
1766                                 "\taddr %08x desc %08x\n",
1767                                 readl(&ep->dma->dmactl),
1768                                 readl(&ep->dma->dmastat),
1769                                 readl(&ep->dma->dmacount),
1770                                 readl(&ep->dma->dmaaddr),
1771                                 readl(&ep->dma->dmadesc));
1772                 size -= t;
1773                 next += t;
1774
1775         }
1776
1777         /* Indexed Registers (none yet) */
1778
1779         /* Statistics */
1780         t = scnprintf(next, size, "\nirqs:  ");
1781         size -= t;
1782         next += t;
1783         for (i = 0; i < dev->n_ep; i++) {
1784                 struct net2280_ep       *ep;
1785
1786                 ep = &dev->ep[i];
1787                 if (i && !ep->irqs)
1788                         continue;
1789                 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1790                 size -= t;
1791                 next += t;
1792
1793         }
1794         t = scnprintf(next, size, "\n");
1795         size -= t;
1796         next += t;
1797
1798         spin_unlock_irqrestore(&dev->lock, flags);
1799
1800         return PAGE_SIZE - size;
1801 }
1802 static DEVICE_ATTR_RO(registers);
1803
1804 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1805                            char *buf)
1806 {
1807         struct net2280          *dev;
1808         char                    *next;
1809         unsigned                size;
1810         unsigned long           flags;
1811         int                     i;
1812
1813         dev = dev_get_drvdata(_dev);
1814         next = buf;
1815         size = PAGE_SIZE;
1816         spin_lock_irqsave(&dev->lock, flags);
1817
1818         for (i = 0; i < dev->n_ep; i++) {
1819                 struct net2280_ep               *ep = &dev->ep[i];
1820                 struct net2280_request          *req;
1821                 int                             t;
1822
1823                 if (i != 0) {
1824                         const struct usb_endpoint_descriptor    *d;
1825
1826                         d = ep->desc;
1827                         if (!d)
1828                                 continue;
1829                         t = d->bEndpointAddress;
1830                         t = scnprintf(next, size,
1831                                 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1832                                 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1833                                 (t & USB_DIR_IN) ? "in" : "out",
1834                                 type_string(d->bmAttributes),
1835                                 usb_endpoint_maxp(d),
1836                                 ep->dma ? "dma" : "pio", ep->fifo_size
1837                                 );
1838                 } else /* ep0 should only have one transfer queued */
1839                         t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1840                                         ep->is_in ? "in" : "out");
1841                 if (t <= 0 || t > size)
1842                         goto done;
1843                 size -= t;
1844                 next += t;
1845
1846                 if (list_empty(&ep->queue)) {
1847                         t = scnprintf(next, size, "\t(nothing queued)\n");
1848                         if (t <= 0 || t > size)
1849                                 goto done;
1850                         size -= t;
1851                         next += t;
1852                         continue;
1853                 }
1854                 list_for_each_entry(req, &ep->queue, queue) {
1855                         if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1856                                 t = scnprintf(next, size,
1857                                         "\treq %p len %d/%d "
1858                                         "buf %p (dmacount %08x)\n",
1859                                         &req->req, req->req.actual,
1860                                         req->req.length, req->req.buf,
1861                                         readl(&ep->dma->dmacount));
1862                         else
1863                                 t = scnprintf(next, size,
1864                                         "\treq %p len %d/%d buf %p\n",
1865                                         &req->req, req->req.actual,
1866                                         req->req.length, req->req.buf);
1867                         if (t <= 0 || t > size)
1868                                 goto done;
1869                         size -= t;
1870                         next += t;
1871
1872                         if (ep->dma) {
1873                                 struct net2280_dma      *td;
1874
1875                                 td = req->td;
1876                                 t = scnprintf(next, size, "\t    td %08x "
1877                                         " count %08x buf %08x desc %08x\n",
1878                                         (u32) req->td_dma,
1879                                         le32_to_cpu(td->dmacount),
1880                                         le32_to_cpu(td->dmaaddr),
1881                                         le32_to_cpu(td->dmadesc));
1882                                 if (t <= 0 || t > size)
1883                                         goto done;
1884                                 size -= t;
1885                                 next += t;
1886                         }
1887                 }
1888         }
1889
1890 done:
1891         spin_unlock_irqrestore(&dev->lock, flags);
1892         return PAGE_SIZE - size;
1893 }
1894 static DEVICE_ATTR_RO(queues);
1895
1896
1897 #else
1898
1899 #define device_create_file(a, b)        (0)
1900 #define device_remove_file(a, b)        do { } while (0)
1901
1902 #endif
1903
1904 /*-------------------------------------------------------------------------*/
1905
1906 /* another driver-specific mode might be a request type doing dma
1907  * to/from another device fifo instead of to/from memory.
1908  */
1909
1910 static void set_fifo_mode(struct net2280 *dev, int mode)
1911 {
1912         /* keeping high bits preserves BAR2 */
1913         writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1914
1915         /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1916         INIT_LIST_HEAD(&dev->gadget.ep_list);
1917         list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1918         list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1919         switch (mode) {
1920         case 0:
1921                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1922                 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1923                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1924                 break;
1925         case 1:
1926                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1927                 break;
1928         case 2:
1929                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1930                 dev->ep[1].fifo_size = 2048;
1931                 dev->ep[2].fifo_size = 1024;
1932                 break;
1933         }
1934         /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1935         list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1936         list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1937 }
1938
1939 static void defect7374_disable_data_eps(struct net2280 *dev)
1940 {
1941         /*
1942          * For Defect 7374, disable data EPs (and more):
1943          *  - This phase undoes the earlier phase of the Defect 7374 workaround,
1944          *    returing ep regs back to normal.
1945          */
1946         struct net2280_ep *ep;
1947         int i;
1948         unsigned char ep_sel;
1949         u32 tmp_reg;
1950
1951         for (i = 1; i < 5; i++) {
1952                 ep = &dev->ep[i];
1953                 writel(i, &ep->cfg->ep_cfg);
1954         }
1955
1956         /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1957         for (i = 0; i < 6; i++)
1958                 writel(0, &dev->dep[i].dep_cfg);
1959
1960         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1961                 /* Select an endpoint for subsequent operations: */
1962                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1963                 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1964
1965                 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1966                                         ep_sel == 18 || ep_sel == 20)
1967                         continue;
1968
1969                 /* Change settings on some selected endpoints */
1970                 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1971                 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1972                 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1973                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1974                 tmp_reg |= BIT(EP_INITIALIZED);
1975                 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1976         }
1977 }
1978
1979 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1980 {
1981         u32 tmp = 0, tmp_reg;
1982         u32 scratch;
1983         int i;
1984         unsigned char ep_sel;
1985
1986         scratch = get_idx_reg(dev->regs, SCRATCH);
1987
1988         WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1989                 == DEFECT7374_FSM_SS_CONTROL_READ);
1990
1991         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
1992
1993         ep_warn(dev, "Operate Defect 7374 workaround soft this time");
1994         ep_warn(dev, "It will operate on cold-reboot and SS connect");
1995
1996         /*GPEPs:*/
1997         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
1998                         (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
1999                         ((dev->enhanced_mode) ?
2000                          BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
2001                          BIT(ENDPOINT_ENABLE)));
2002
2003         for (i = 1; i < 5; i++)
2004                 writel(tmp, &dev->ep[i].cfg->ep_cfg);
2005
2006         /* CSRIN, PCIIN, STATIN, RCIN*/
2007         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
2008         writel(tmp, &dev->dep[1].dep_cfg);
2009         writel(tmp, &dev->dep[3].dep_cfg);
2010         writel(tmp, &dev->dep[4].dep_cfg);
2011         writel(tmp, &dev->dep[5].dep_cfg);
2012
2013         /*Implemented for development and debug.
2014          * Can be refined/tuned later.*/
2015         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
2016                 /* Select an endpoint for subsequent operations: */
2017                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
2018                 writel(((tmp_reg & ~0x1f) | ep_sel),
2019                                 &dev->plregs->pl_ep_ctrl);
2020
2021                 if (ep_sel == 1) {
2022                         tmp =
2023                                 (readl(&dev->plregs->pl_ep_ctrl) |
2024                                  BIT(CLEAR_ACK_ERROR_CODE) | 0);
2025                         writel(tmp, &dev->plregs->pl_ep_ctrl);
2026                         continue;
2027                 }
2028
2029                 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
2030                                 ep_sel == 18  || ep_sel == 20)
2031                         continue;
2032
2033                 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
2034                                 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
2035                 writel(tmp, &dev->plregs->pl_ep_cfg_4);
2036
2037                 tmp = readl(&dev->plregs->pl_ep_ctrl) &
2038                         ~BIT(EP_INITIALIZED);
2039                 writel(tmp, &dev->plregs->pl_ep_ctrl);
2040
2041         }
2042
2043         /* Set FSM to focus on the first Control Read:
2044          * - Tip: Connection speed is known upon the first
2045          * setup request.*/
2046         scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2047         set_idx_reg(dev->regs, SCRATCH, scratch);
2048
2049 }
2050
2051 /* keeping it simple:
2052  * - one bus driver, initted first;
2053  * - one function driver, initted second
2054  *
2055  * most of the work to support multiple net2280 controllers would
2056  * be to associate this gadget driver (yes?) with all of them, or
2057  * perhaps to bind specific drivers to specific devices.
2058  */
2059
2060 static void usb_reset_228x(struct net2280 *dev)
2061 {
2062         u32     tmp;
2063
2064         dev->gadget.speed = USB_SPEED_UNKNOWN;
2065         (void) readl(&dev->usb->usbctl);
2066
2067         net2280_led_init(dev);
2068
2069         /* disable automatic responses, and irqs */
2070         writel(0, &dev->usb->stdrsp);
2071         writel(0, &dev->regs->pciirqenb0);
2072         writel(0, &dev->regs->pciirqenb1);
2073
2074         /* clear old dma and irq state */
2075         for (tmp = 0; tmp < 4; tmp++) {
2076                 struct net2280_ep       *ep = &dev->ep[tmp + 1];
2077                 if (ep->dma)
2078                         abort_dma(ep);
2079         }
2080
2081         writel(~0, &dev->regs->irqstat0),
2082         writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2083
2084         /* reset, and enable pci */
2085         tmp = readl(&dev->regs->devinit) |
2086                 BIT(PCI_ENABLE) |
2087                 BIT(FIFO_SOFT_RESET) |
2088                 BIT(USB_SOFT_RESET) |
2089                 BIT(M8051_RESET);
2090         writel(tmp, &dev->regs->devinit);
2091
2092         /* standard fifo and endpoint allocations */
2093         set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2094 }
2095
2096 static void usb_reset_338x(struct net2280 *dev)
2097 {
2098         u32 tmp;
2099
2100         dev->gadget.speed = USB_SPEED_UNKNOWN;
2101         (void)readl(&dev->usb->usbctl);
2102
2103         net2280_led_init(dev);
2104
2105         if (dev->bug7734_patched) {
2106                 /* disable automatic responses, and irqs */
2107                 writel(0, &dev->usb->stdrsp);
2108                 writel(0, &dev->regs->pciirqenb0);
2109                 writel(0, &dev->regs->pciirqenb1);
2110         }
2111
2112         /* clear old dma and irq state */
2113         for (tmp = 0; tmp < 4; tmp++) {
2114                 struct net2280_ep *ep = &dev->ep[tmp + 1];
2115                 struct net2280_dma_regs __iomem *dma;
2116
2117                 if (ep->dma) {
2118                         abort_dma(ep);
2119                 } else {
2120                         dma = &dev->dma[tmp];
2121                         writel(BIT(DMA_ABORT), &dma->dmastat);
2122                         writel(0, &dma->dmactl);
2123                 }
2124         }
2125
2126         writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2127
2128         if (dev->bug7734_patched) {
2129                 /* reset, and enable pci */
2130                 tmp = readl(&dev->regs->devinit) |
2131                     BIT(PCI_ENABLE) |
2132                     BIT(FIFO_SOFT_RESET) |
2133                     BIT(USB_SOFT_RESET) |
2134                     BIT(M8051_RESET);
2135
2136                 writel(tmp, &dev->regs->devinit);
2137         }
2138
2139         /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2140         INIT_LIST_HEAD(&dev->gadget.ep_list);
2141
2142         for (tmp = 1; tmp < dev->n_ep; tmp++)
2143                 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2144
2145 }
2146
2147 static void usb_reset(struct net2280 *dev)
2148 {
2149         if (dev->quirks & PLX_LEGACY)
2150                 return usb_reset_228x(dev);
2151         return usb_reset_338x(dev);
2152 }
2153
2154 static void usb_reinit_228x(struct net2280 *dev)
2155 {
2156         u32     tmp;
2157
2158         /* basic endpoint init */
2159         for (tmp = 0; tmp < 7; tmp++) {
2160                 struct net2280_ep       *ep = &dev->ep[tmp];
2161
2162                 ep->ep.name = ep_info_dft[tmp].name;
2163                 ep->ep.caps = ep_info_dft[tmp].caps;
2164                 ep->dev = dev;
2165                 ep->num = tmp;
2166
2167                 if (tmp > 0 && tmp <= 4) {
2168                         ep->fifo_size = 1024;
2169                         ep->dma = &dev->dma[tmp - 1];
2170                 } else
2171                         ep->fifo_size = 64;
2172                 ep->regs = &dev->epregs[tmp];
2173                 ep->cfg = &dev->epregs[tmp];
2174                 ep_reset_228x(dev->regs, ep);
2175         }
2176         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2177         usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2178         usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2179
2180         dev->gadget.ep0 = &dev->ep[0].ep;
2181         dev->ep[0].stopped = 0;
2182         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2183
2184         /* we want to prevent lowlevel/insecure access from the USB host,
2185          * but erratum 0119 means this enable bit is ignored
2186          */
2187         for (tmp = 0; tmp < 5; tmp++)
2188                 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2189 }
2190
2191 static void usb_reinit_338x(struct net2280 *dev)
2192 {
2193         int i;
2194         u32 tmp, val;
2195         static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2196         static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2197                                                 0x00, 0xC0, 0x00, 0xC0 };
2198
2199         /* basic endpoint init */
2200         for (i = 0; i < dev->n_ep; i++) {
2201                 struct net2280_ep *ep = &dev->ep[i];
2202
2203                 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2204                                                    ep_info_dft[i].name;
2205                 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2206                                                    ep_info_dft[i].caps;
2207                 ep->dev = dev;
2208                 ep->num = i;
2209
2210                 if (i > 0 && i <= 4)
2211                         ep->dma = &dev->dma[i - 1];
2212
2213                 if (dev->enhanced_mode) {
2214                         ep->cfg = &dev->epregs[ne[i]];
2215                         /*
2216                          * Set USB endpoint number, hardware allows same number
2217                          * in both directions.
2218                          */
2219                          if (i > 0 && i < 5)
2220                                 writel(ne[i], &ep->cfg->ep_cfg);
2221                         ep->regs = (struct net2280_ep_regs __iomem *)
2222                                 (((void __iomem *)&dev->epregs[ne[i]]) +
2223                                 ep_reg_addr[i]);
2224                 } else {
2225                         ep->cfg = &dev->epregs[i];
2226                         ep->regs = &dev->epregs[i];
2227                 }
2228
2229                 ep->fifo_size = (i != 0) ? 2048 : 512;
2230
2231                 ep_reset_338x(dev->regs, ep);
2232         }
2233         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2234
2235         dev->gadget.ep0 = &dev->ep[0].ep;
2236         dev->ep[0].stopped = 0;
2237
2238         /* Link layer set up */
2239         if (dev->bug7734_patched) {
2240                 tmp = readl(&dev->usb_ext->usbctl2) &
2241                     ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2242                 writel(tmp, &dev->usb_ext->usbctl2);
2243         }
2244
2245         /* Hardware Defect and Workaround */
2246         val = readl(&dev->llregs->ll_lfps_5);
2247         val &= ~(0xf << TIMER_LFPS_6US);
2248         val |= 0x5 << TIMER_LFPS_6US;
2249         writel(val, &dev->llregs->ll_lfps_5);
2250
2251         val = readl(&dev->llregs->ll_lfps_6);
2252         val &= ~(0xffff << TIMER_LFPS_80US);
2253         val |= 0x0100 << TIMER_LFPS_80US;
2254         writel(val, &dev->llregs->ll_lfps_6);
2255
2256         /*
2257          * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2258          * Hot Reset Exit Handshake may Fail in Specific Case using
2259          * Default Register Settings. Workaround for Enumeration test.
2260          */
2261         val = readl(&dev->llregs->ll_tsn_counters_2);
2262         val &= ~(0x1f << HOT_TX_NORESET_TS2);
2263         val |= 0x10 << HOT_TX_NORESET_TS2;
2264         writel(val, &dev->llregs->ll_tsn_counters_2);
2265
2266         val = readl(&dev->llregs->ll_tsn_counters_3);
2267         val &= ~(0x1f << HOT_RX_RESET_TS2);
2268         val |= 0x3 << HOT_RX_RESET_TS2;
2269         writel(val, &dev->llregs->ll_tsn_counters_3);
2270
2271         /*
2272          * AB errata. Errata 11. Workaround for Default Duration of LFPS
2273          * Handshake Signaling for Device-Initiated U1 Exit is too short.
2274          * Without this, various enumeration failures observed with
2275          * modern superspeed hosts.
2276          */
2277         val = readl(&dev->llregs->ll_lfps_timers_2);
2278         writel((val & 0xffff0000) | LFPS_TIMERS_2_WORKAROUND_VALUE,
2279                &dev->llregs->ll_lfps_timers_2);
2280
2281         /*
2282          * Set Recovery Idle to Recover bit:
2283          * - On SS connections, setting Recovery Idle to Recover Fmw improves
2284          *   link robustness with various hosts and hubs.
2285          * - It is safe to set for all connection speeds; all chip revisions.
2286          * - R-M-W to leave other bits undisturbed.
2287          * - Reference PLX TT-7372
2288         */
2289         val = readl(&dev->llregs->ll_tsn_chicken_bit);
2290         val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2291         writel(val, &dev->llregs->ll_tsn_chicken_bit);
2292
2293         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2294
2295         /* disable dedicated endpoints */
2296         writel(0x0D, &dev->dep[0].dep_cfg);
2297         writel(0x0D, &dev->dep[1].dep_cfg);
2298         writel(0x0E, &dev->dep[2].dep_cfg);
2299         writel(0x0E, &dev->dep[3].dep_cfg);
2300         writel(0x0F, &dev->dep[4].dep_cfg);
2301         writel(0x0C, &dev->dep[5].dep_cfg);
2302 }
2303
2304 static void usb_reinit(struct net2280 *dev)
2305 {
2306         if (dev->quirks & PLX_LEGACY)
2307                 return usb_reinit_228x(dev);
2308         return usb_reinit_338x(dev);
2309 }
2310
2311 static void ep0_start_228x(struct net2280 *dev)
2312 {
2313         writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2314                 BIT(CLEAR_NAK_OUT_PACKETS) |
2315                 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2316                 &dev->epregs[0].ep_rsp);
2317
2318         /*
2319          * hardware optionally handles a bunch of standard requests
2320          * that the API hides from drivers anyway.  have it do so.
2321          * endpoint status/features are handled in software, to
2322          * help pass tests for some dubious behavior.
2323          */
2324         writel(BIT(SET_TEST_MODE) |
2325                 BIT(SET_ADDRESS) |
2326                 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2327                 BIT(GET_DEVICE_STATUS) |
2328                 BIT(GET_INTERFACE_STATUS),
2329                 &dev->usb->stdrsp);
2330         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2331                 BIT(SELF_POWERED_USB_DEVICE) |
2332                 BIT(REMOTE_WAKEUP_SUPPORT) |
2333                 (dev->softconnect << USB_DETECT_ENABLE) |
2334                 BIT(SELF_POWERED_STATUS),
2335                 &dev->usb->usbctl);
2336
2337         /* enable irqs so we can see ep0 and general operation  */
2338         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2339                 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2340                 &dev->regs->pciirqenb0);
2341         writel(BIT(PCI_INTERRUPT_ENABLE) |
2342                 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2343                 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2344                 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2345                 BIT(VBUS_INTERRUPT_ENABLE) |
2346                 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2347                 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2348                 &dev->regs->pciirqenb1);
2349
2350         /* don't leave any writes posted */
2351         (void) readl(&dev->usb->usbctl);
2352 }
2353
2354 static void ep0_start_338x(struct net2280 *dev)
2355 {
2356
2357         if (dev->bug7734_patched)
2358                 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2359                        BIT(SET_EP_HIDE_STATUS_PHASE),
2360                        &dev->epregs[0].ep_rsp);
2361
2362         /*
2363          * hardware optionally handles a bunch of standard requests
2364          * that the API hides from drivers anyway.  have it do so.
2365          * endpoint status/features are handled in software, to
2366          * help pass tests for some dubious behavior.
2367          */
2368         writel(BIT(SET_ISOCHRONOUS_DELAY) |
2369                BIT(SET_SEL) |
2370                BIT(SET_TEST_MODE) |
2371                BIT(SET_ADDRESS) |
2372                BIT(GET_INTERFACE_STATUS) |
2373                BIT(GET_DEVICE_STATUS),
2374                 &dev->usb->stdrsp);
2375         dev->wakeup_enable = 1;
2376         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2377                (dev->softconnect << USB_DETECT_ENABLE) |
2378                BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2379                &dev->usb->usbctl);
2380
2381         /* enable irqs so we can see ep0 and general operation  */
2382         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2383                BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2384                &dev->regs->pciirqenb0);
2385         writel(BIT(PCI_INTERRUPT_ENABLE) |
2386                BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2387                BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2388                BIT(VBUS_INTERRUPT_ENABLE),
2389                &dev->regs->pciirqenb1);
2390
2391         /* don't leave any writes posted */
2392         (void)readl(&dev->usb->usbctl);
2393 }
2394
2395 static void ep0_start(struct net2280 *dev)
2396 {
2397         if (dev->quirks & PLX_LEGACY)
2398                 return ep0_start_228x(dev);
2399         return ep0_start_338x(dev);
2400 }
2401
2402 /* when a driver is successfully registered, it will receive
2403  * control requests including set_configuration(), which enables
2404  * non-control requests.  then usb traffic follows until a
2405  * disconnect is reported.  then a host may connect again, or
2406  * the driver might get unbound.
2407  */
2408 static int net2280_start(struct usb_gadget *_gadget,
2409                 struct usb_gadget_driver *driver)
2410 {
2411         struct net2280          *dev;
2412         int                     retval;
2413         unsigned                i;
2414
2415         /* insist on high speed support from the driver, since
2416          * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2417          * "must not be used in normal operation"
2418          */
2419         if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2420                         !driver->setup)
2421                 return -EINVAL;
2422
2423         dev = container_of(_gadget, struct net2280, gadget);
2424
2425         for (i = 0; i < dev->n_ep; i++)
2426                 dev->ep[i].irqs = 0;
2427
2428         /* hook up the driver ... */
2429         driver->driver.bus = NULL;
2430         dev->driver = driver;
2431
2432         retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2433         if (retval)
2434                 goto err_unbind;
2435         retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2436         if (retval)
2437                 goto err_func;
2438
2439         /* enable host detection and ep0; and we're ready
2440          * for set_configuration as well as eventual disconnect.
2441          */
2442         net2280_led_active(dev, 1);
2443
2444         if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
2445                 defect7374_enable_data_eps_zero(dev);
2446
2447         ep0_start(dev);
2448
2449         /* pci writes may still be posted */
2450         return 0;
2451
2452 err_func:
2453         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2454 err_unbind:
2455         dev->driver = NULL;
2456         return retval;
2457 }
2458
2459 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2460 {
2461         int                     i;
2462
2463         /* don't disconnect if it's not connected */
2464         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2465                 driver = NULL;
2466
2467         /* stop hardware; prevent new request submissions;
2468          * and kill any outstanding requests.
2469          */
2470         usb_reset(dev);
2471         for (i = 0; i < dev->n_ep; i++)
2472                 nuke(&dev->ep[i]);
2473
2474         /* report disconnect; the driver is already quiesced */
2475         if (driver) {
2476                 spin_unlock(&dev->lock);
2477                 driver->disconnect(&dev->gadget);
2478                 spin_lock(&dev->lock);
2479         }
2480
2481         usb_reinit(dev);
2482 }
2483
2484 static int net2280_stop(struct usb_gadget *_gadget)
2485 {
2486         struct net2280  *dev;
2487         unsigned long   flags;
2488
2489         dev = container_of(_gadget, struct net2280, gadget);
2490
2491         spin_lock_irqsave(&dev->lock, flags);
2492         stop_activity(dev, NULL);
2493         spin_unlock_irqrestore(&dev->lock, flags);
2494
2495         net2280_led_active(dev, 0);
2496
2497         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2498         device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2499
2500         dev->driver = NULL;
2501
2502         return 0;
2503 }
2504
2505 /*-------------------------------------------------------------------------*/
2506
2507 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2508  * also works for dma-capable endpoints, in pio mode or just
2509  * to manually advance the queue after short OUT transfers.
2510  */
2511 static void handle_ep_small(struct net2280_ep *ep)
2512 {
2513         struct net2280_request  *req;
2514         u32                     t;
2515         /* 0 error, 1 mid-data, 2 done */
2516         int                     mode = 1;
2517
2518         if (!list_empty(&ep->queue))
2519                 req = list_entry(ep->queue.next,
2520                         struct net2280_request, queue);
2521         else
2522                 req = NULL;
2523
2524         /* ack all, and handle what we care about */
2525         t = readl(&ep->regs->ep_stat);
2526         ep->irqs++;
2527
2528         ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2529                         ep->ep.name, t, req ? &req->req : NULL);
2530
2531         if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2532                 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2533         else
2534                 /* Added for 2282 */
2535                 writel(t, &ep->regs->ep_stat);
2536
2537         /* for ep0, monitor token irqs to catch data stage length errors
2538          * and to synchronize on status.
2539          *
2540          * also, to defer reporting of protocol stalls ... here's where
2541          * data or status first appears, handling stalls here should never
2542          * cause trouble on the host side..
2543          *
2544          * control requests could be slightly faster without token synch for
2545          * status, but status can jam up that way.
2546          */
2547         if (unlikely(ep->num == 0)) {
2548                 if (ep->is_in) {
2549                         /* status; stop NAKing */
2550                         if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2551                                 if (ep->dev->protocol_stall) {
2552                                         ep->stopped = 1;
2553                                         set_halt(ep);
2554                                 }
2555                                 if (!req)
2556                                         allow_status(ep);
2557                                 mode = 2;
2558                         /* reply to extra IN data tokens with a zlp */
2559                         } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2560                                 if (ep->dev->protocol_stall) {
2561                                         ep->stopped = 1;
2562                                         set_halt(ep);
2563                                         mode = 2;
2564                                 } else if (ep->responded &&
2565                                                 !req && !ep->stopped)
2566                                         write_fifo(ep, NULL);
2567                         }
2568                 } else {
2569                         /* status; stop NAKing */
2570                         if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2571                                 if (ep->dev->protocol_stall) {
2572                                         ep->stopped = 1;
2573                                         set_halt(ep);
2574                                 }
2575                                 mode = 2;
2576                         /* an extra OUT token is an error */
2577                         } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2578                                         req &&
2579                                         req->req.actual == req->req.length) ||
2580                                         (ep->responded && !req)) {
2581                                 ep->dev->protocol_stall = 1;
2582                                 set_halt(ep);
2583                                 ep->stopped = 1;
2584                                 if (req)
2585                                         done(ep, req, -EOVERFLOW);
2586                                 req = NULL;
2587                         }
2588                 }
2589         }
2590
2591         if (unlikely(!req))
2592                 return;
2593
2594         /* manual DMA queue advance after short OUT */
2595         if (likely(ep->dma)) {
2596                 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2597                         struct net2280_request *stuck_req = NULL;
2598                         int     stopped = ep->stopped;
2599                         int     num_completed;
2600                         int     stuck = 0;
2601                         u32     count;
2602
2603                         /* TRANSFERRED works around OUT_DONE erratum 0112.
2604                          * we expect (N <= maxpacket) bytes; host wrote M.
2605                          * iff (M < N) we won't ever see a DMA interrupt.
2606                          */
2607                         ep->stopped = 1;
2608                         for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2609
2610                                 /* any preceding dma transfers must finish.
2611                                  * dma handles (M >= N), may empty the queue
2612                                  */
2613                                 num_completed = scan_dma_completions(ep);
2614                                 if (unlikely(list_empty(&ep->queue) ||
2615                                                 ep->out_overflow)) {
2616                                         req = NULL;
2617                                         break;
2618                                 }
2619                                 req = list_entry(ep->queue.next,
2620                                         struct net2280_request, queue);
2621
2622                                 /* here either (M < N), a "real" short rx;
2623                                  * or (M == N) and the queue didn't empty
2624                                  */
2625                                 if (likely(t & BIT(FIFO_EMPTY))) {
2626                                         count = readl(&ep->dma->dmacount);
2627                                         count &= DMA_BYTE_COUNT_MASK;
2628                                         if (readl(&ep->dma->dmadesc)
2629                                                         != req->td_dma)
2630                                                 req = NULL;
2631                                         break;
2632                                 }
2633
2634                                 /* Escape loop if no dma transfers completed
2635                                  * after few retries.
2636                                  */
2637                                 if (num_completed == 0) {
2638                                         if (stuck_req == req &&
2639                                             readl(&ep->dma->dmadesc) !=
2640                                                   req->td_dma && stuck++ > 5) {
2641                                                 count = readl(
2642                                                         &ep->dma->dmacount);
2643                                                 count &= DMA_BYTE_COUNT_MASK;
2644                                                 req = NULL;
2645                                                 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n",
2646                                                         ep->ep.name, stuck,
2647                                                         count);
2648                                                 break;
2649                                         } else if (stuck_req != req) {
2650                                                 stuck_req = req;
2651                                                 stuck = 0;
2652                                         }
2653                                 } else {
2654                                         stuck_req = NULL;
2655                                         stuck = 0;
2656                                 }
2657
2658                                 udelay(1);
2659                         }
2660
2661                         /* stop DMA, leave ep NAKing */
2662                         writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2663                         spin_stop_dma(ep->dma);
2664
2665                         if (likely(req)) {
2666                                 req->td->dmacount = 0;
2667                                 t = readl(&ep->regs->ep_avail);
2668                                 dma_done(ep, req, count,
2669                                         (ep->out_overflow || t)
2670                                                 ? -EOVERFLOW : 0);
2671                         }
2672
2673                         /* also flush to prevent erratum 0106 trouble */
2674                         if (unlikely(ep->out_overflow ||
2675                                         (ep->dev->chiprev == 0x0100 &&
2676                                         ep->dev->gadget.speed
2677                                         == USB_SPEED_FULL))) {
2678                                 out_flush(ep);
2679                                 ep->out_overflow = 0;
2680                         }
2681
2682                         /* (re)start dma if needed, stop NAKing */
2683                         ep->stopped = stopped;
2684                         if (!list_empty(&ep->queue))
2685                                 restart_dma(ep);
2686                 } else
2687                         ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2688                                         ep->ep.name, t);
2689                 return;
2690
2691         /* data packet(s) received (in the fifo, OUT) */
2692         } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2693                 if (read_fifo(ep, req) && ep->num != 0)
2694                         mode = 2;
2695
2696         /* data packet(s) transmitted (IN) */
2697         } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2698                 unsigned        len;
2699
2700                 len = req->req.length - req->req.actual;
2701                 if (len > ep->ep.maxpacket)
2702                         len = ep->ep.maxpacket;
2703                 req->req.actual += len;
2704
2705                 /* if we wrote it all, we're usually done */
2706                 /* send zlps until the status stage */
2707                 if ((req->req.actual == req->req.length) &&
2708                         (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2709                                 mode = 2;
2710
2711         /* there was nothing to do ...  */
2712         } else if (mode == 1)
2713                 return;
2714
2715         /* done */
2716         if (mode == 2) {
2717                 /* stream endpoints often resubmit/unlink in completion */
2718                 done(ep, req, 0);
2719
2720                 /* maybe advance queue to next request */
2721                 if (ep->num == 0) {
2722                         /* NOTE:  net2280 could let gadget driver start the
2723                          * status stage later. since not all controllers let
2724                          * them control that, the api doesn't (yet) allow it.
2725                          */
2726                         if (!ep->stopped)
2727                                 allow_status(ep);
2728                         req = NULL;
2729                 } else {
2730                         if (!list_empty(&ep->queue) && !ep->stopped)
2731                                 req = list_entry(ep->queue.next,
2732                                         struct net2280_request, queue);
2733                         else
2734                                 req = NULL;
2735                         if (req && !ep->is_in)
2736                                 stop_out_naking(ep);
2737                 }
2738         }
2739
2740         /* is there a buffer for the next packet?
2741          * for best streaming performance, make sure there is one.
2742          */
2743         if (req && !ep->stopped) {
2744
2745                 /* load IN fifo with next packet (may be zlp) */
2746                 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2747                         write_fifo(ep, &req->req);
2748         }
2749 }
2750
2751 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2752 {
2753         struct net2280_ep       *ep;
2754
2755         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2756                 return &dev->ep[0];
2757         list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2758                 u8      bEndpointAddress;
2759
2760                 if (!ep->desc)
2761                         continue;
2762                 bEndpointAddress = ep->desc->bEndpointAddress;
2763                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2764                         continue;
2765                 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2766                         return ep;
2767         }
2768         return NULL;
2769 }
2770
2771 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2772 {
2773         u32 scratch, fsmvalue;
2774         u32 ack_wait_timeout, state;
2775
2776         /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2777         scratch = get_idx_reg(dev->regs, SCRATCH);
2778         fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2779         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2780
2781         if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2782                                 (r.bRequestType & USB_DIR_IN)))
2783                 return;
2784
2785         /* This is the first Control Read for this connection: */
2786         if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2787                 /*
2788                  * Connection is NOT SS:
2789                  * - Connection must be FS or HS.
2790                  * - This FSM state should allow workaround software to
2791                  * run after the next USB connection.
2792                  */
2793                 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2794                 dev->bug7734_patched = 1;
2795                 goto restore_data_eps;
2796         }
2797
2798         /* Connection is SS: */
2799         for (ack_wait_timeout = 0;
2800                         ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2801                         ack_wait_timeout++) {
2802
2803                 state = readl(&dev->plregs->pl_ep_status_1)
2804                         & (0xff << STATE);
2805                 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2806                         (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2807                         scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2808                         dev->bug7734_patched = 1;
2809                         break;
2810                 }
2811
2812                 /*
2813                  * We have not yet received host's Data Phase ACK
2814                  * - Wait and try again.
2815                  */
2816                 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2817
2818                 continue;
2819         }
2820
2821
2822         if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2823                 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2824                 "to detect SS host's data phase ACK.");
2825                 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2826                 "got 0x%2.2x.\n", state >> STATE);
2827         } else {
2828                 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2829                 "%duSec for Control Read Data Phase ACK\n",
2830                         DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2831         }
2832
2833 restore_data_eps:
2834         /*
2835          * Restore data EPs to their pre-workaround settings (disabled,
2836          * initialized, and other details).
2837          */
2838         defect7374_disable_data_eps(dev);
2839
2840         set_idx_reg(dev->regs, SCRATCH, scratch);
2841
2842         return;
2843 }
2844
2845 static void ep_clear_seqnum(struct net2280_ep *ep)
2846 {
2847         struct net2280 *dev = ep->dev;
2848         u32 val;
2849         static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2850
2851         val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2852         val |= ep_pl[ep->num];
2853         writel(val, &dev->plregs->pl_ep_ctrl);
2854         val |= BIT(SEQUENCE_NUMBER_RESET);
2855         writel(val, &dev->plregs->pl_ep_ctrl);
2856
2857         return;
2858 }
2859
2860 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2861                 struct net2280_ep *ep, struct usb_ctrlrequest r)
2862 {
2863         struct net2280_ep *e;
2864         u16 status;
2865         int tmp = 0;
2866
2867 #define w_value         le16_to_cpu(r.wValue)
2868 #define w_index         le16_to_cpu(r.wIndex)
2869 #define w_length        le16_to_cpu(r.wLength)
2870
2871         switch (r.bRequest) {
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 = container_of(_dev, struct net2280, gadget.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         if (dev->added)
3575                 usb_del_gadget(&dev->gadget);
3576
3577         BUG_ON(dev->driver);
3578
3579         /* then clean up the resources we allocated during probe() */
3580         if (dev->requests) {
3581                 int             i;
3582                 for (i = 1; i < 5; i++) {
3583                         if (!dev->ep[i].dummy)
3584                                 continue;
3585                         dma_pool_free(dev->requests, dev->ep[i].dummy,
3586                                         dev->ep[i].td_dma);
3587                 }
3588                 dma_pool_destroy(dev->requests);
3589         }
3590         if (dev->got_irq)
3591                 free_irq(pdev->irq, dev);
3592         if (dev->quirks & PLX_PCIE)
3593                 pci_disable_msi(pdev);
3594         if (dev->regs) {
3595                 net2280_led_shutdown(dev);
3596                 iounmap(dev->regs);
3597         }
3598         if (dev->region)
3599                 release_mem_region(pci_resource_start(pdev, 0),
3600                                 pci_resource_len(pdev, 0));
3601         if (dev->enabled)
3602                 pci_disable_device(pdev);
3603         device_remove_file(&pdev->dev, &dev_attr_registers);
3604
3605         ep_info(dev, "unbind\n");
3606         usb_put_gadget(&dev->gadget);
3607 }
3608
3609 /* wrap this driver around the specified device, but
3610  * don't respond over USB until a gadget driver binds to us.
3611  */
3612
3613 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3614 {
3615         struct net2280          *dev;
3616         unsigned long           resource, len;
3617         void                    __iomem *base = NULL;
3618         int                     retval, i;
3619
3620         /* alloc, and start init */
3621         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3622         if (dev == NULL) {
3623                 retval = -ENOMEM;
3624                 goto done;
3625         }
3626
3627         pci_set_drvdata(pdev, dev);
3628         usb_initialize_gadget(&pdev->dev, &dev->gadget, gadget_release);
3629         spin_lock_init(&dev->lock);
3630         dev->quirks = id->driver_data;
3631         dev->pdev = pdev;
3632         dev->gadget.ops = &net2280_ops;
3633         dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3634                                 USB_SPEED_SUPER : USB_SPEED_HIGH;
3635
3636         /* the "gadget" abstracts/virtualizes the controller */
3637         dev->gadget.name = driver_name;
3638
3639         /* now all the pci goodies ... */
3640         if (pci_enable_device(pdev) < 0) {
3641                 retval = -ENODEV;
3642                 goto done;
3643         }
3644         dev->enabled = 1;
3645
3646         /* BAR 0 holds all the registers
3647          * BAR 1 is 8051 memory; unused here (note erratum 0103)
3648          * BAR 2 is fifo memory; unused here
3649          */
3650         resource = pci_resource_start(pdev, 0);
3651         len = pci_resource_len(pdev, 0);
3652         if (!request_mem_region(resource, len, driver_name)) {
3653                 ep_dbg(dev, "controller already in use\n");
3654                 retval = -EBUSY;
3655                 goto done;
3656         }
3657         dev->region = 1;
3658
3659         /* FIXME provide firmware download interface to put
3660          * 8051 code into the chip, e.g. to turn on PCI PM.
3661          */
3662
3663         base = ioremap(resource, len);
3664         if (base == NULL) {
3665                 ep_dbg(dev, "can't map memory\n");
3666                 retval = -EFAULT;
3667                 goto done;
3668         }
3669         dev->regs = (struct net2280_regs __iomem *) base;
3670         dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3671         dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3672         dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3673         dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3674         dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3675
3676         if (dev->quirks & PLX_PCIE) {
3677                 u32 fsmvalue;
3678                 u32 usbstat;
3679                 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3680                                                         (base + 0x00b4);
3681                 dev->llregs = (struct usb338x_ll_regs __iomem *)
3682                                                         (base + 0x0700);
3683                 dev->plregs = (struct usb338x_pl_regs __iomem *)
3684                                                         (base + 0x0800);
3685                 usbstat = readl(&dev->usb->usbstat);
3686                 dev->enhanced_mode = !!(usbstat & BIT(11));
3687                 dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3688                 /* put into initial config, link up all endpoints */
3689                 fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3690                                         (0xf << DEFECT7374_FSM_FIELD);
3691                 /* See if firmware needs to set up for workaround: */
3692                 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3693                         dev->bug7734_patched = 1;
3694                         writel(0, &dev->usb->usbctl);
3695                 } else
3696                         dev->bug7734_patched = 0;
3697         } else {
3698                 dev->enhanced_mode = 0;
3699                 dev->n_ep = 7;
3700                 /* put into initial config, link up all endpoints */
3701                 writel(0, &dev->usb->usbctl);
3702         }
3703
3704         usb_reset(dev);
3705         usb_reinit(dev);
3706
3707         /* irq setup after old hardware is cleaned up */
3708         if (!pdev->irq) {
3709                 ep_err(dev, "No IRQ.  Check PCI setup!\n");
3710                 retval = -ENODEV;
3711                 goto done;
3712         }
3713
3714         if (dev->quirks & PLX_PCIE)
3715                 if (pci_enable_msi(pdev))
3716                         ep_err(dev, "Failed to enable MSI mode\n");
3717
3718         if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3719                                                         driver_name, dev)) {
3720                 ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3721                 retval = -EBUSY;
3722                 goto done;
3723         }
3724         dev->got_irq = 1;
3725
3726         /* DMA setup */
3727         /* NOTE:  we know only the 32 LSBs of dma addresses may be nonzero */
3728         dev->requests = dma_pool_create("requests", &pdev->dev,
3729                 sizeof(struct net2280_dma),
3730                 0 /* no alignment requirements */,
3731                 0 /* or page-crossing issues */);
3732         if (!dev->requests) {
3733                 ep_dbg(dev, "can't get request pool\n");
3734                 retval = -ENOMEM;
3735                 goto done;
3736         }
3737         for (i = 1; i < 5; i++) {
3738                 struct net2280_dma      *td;
3739
3740                 td = dma_pool_alloc(dev->requests, GFP_KERNEL,
3741                                 &dev->ep[i].td_dma);
3742                 if (!td) {
3743                         ep_dbg(dev, "can't get dummy %d\n", i);
3744                         retval = -ENOMEM;
3745                         goto done;
3746                 }
3747                 td->dmacount = 0;       /* not VALID */
3748                 td->dmadesc = td->dmaaddr;
3749                 dev->ep[i].dummy = td;
3750         }
3751
3752         /* enable lower-overhead pci memory bursts during DMA */
3753         if (dev->quirks & PLX_LEGACY)
3754                 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3755                         /*
3756                          * 256 write retries may not be enough...
3757                            BIT(PCI_RETRY_ABORT_ENABLE) |
3758                         */
3759                         BIT(DMA_READ_MULTIPLE_ENABLE) |
3760                         BIT(DMA_READ_LINE_ENABLE),
3761                         &dev->pci->pcimstctl);
3762         /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3763         pci_set_master(pdev);
3764         pci_try_set_mwi(pdev);
3765
3766         /* ... also flushes any posted pci writes */
3767         dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3768
3769         /* done */
3770         ep_info(dev, "%s\n", driver_desc);
3771         ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3772                         pdev->irq, base, dev->chiprev);
3773         ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3774                 dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3775         retval = device_create_file(&pdev->dev, &dev_attr_registers);
3776         if (retval)
3777                 goto done;
3778
3779         retval = usb_add_gadget(&dev->gadget);
3780         if (retval)
3781                 goto done;
3782         dev->added = 1;
3783         return 0;
3784
3785 done:
3786         if (dev) {
3787                 net2280_remove(pdev);
3788                 kfree(dev);
3789         }
3790         return retval;
3791 }
3792
3793 /* make sure the board is quiescent; otherwise it will continue
3794  * generating IRQs across the upcoming reboot.
3795  */
3796
3797 static void net2280_shutdown(struct pci_dev *pdev)
3798 {
3799         struct net2280          *dev = pci_get_drvdata(pdev);
3800
3801         /* disable IRQs */
3802         writel(0, &dev->regs->pciirqenb0);
3803         writel(0, &dev->regs->pciirqenb1);
3804
3805         /* disable the pullup so the host will think we're gone */
3806         writel(0, &dev->usb->usbctl);
3807
3808 }
3809
3810
3811 /*-------------------------------------------------------------------------*/
3812
3813 static const struct pci_device_id pci_ids[] = { {
3814         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3815         .class_mask =   ~0,
3816         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3817         .device =       0x2280,
3818         .subvendor =    PCI_ANY_ID,
3819         .subdevice =    PCI_ANY_ID,
3820         .driver_data =  PLX_LEGACY | PLX_2280,
3821         }, {
3822         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3823         .class_mask =   ~0,
3824         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3825         .device =       0x2282,
3826         .subvendor =    PCI_ANY_ID,
3827         .subdevice =    PCI_ANY_ID,
3828         .driver_data =  PLX_LEGACY,
3829         },
3830         {
3831         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3832         .class_mask =   ~0,
3833         .vendor =       PCI_VENDOR_ID_PLX,
3834         .device =       0x2380,
3835         .subvendor =    PCI_ANY_ID,
3836         .subdevice =    PCI_ANY_ID,
3837         .driver_data =  PLX_PCIE,
3838          },
3839         {
3840         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3841         .class_mask =   ~0,
3842         .vendor =       PCI_VENDOR_ID_PLX,
3843         .device =       0x3380,
3844         .subvendor =    PCI_ANY_ID,
3845         .subdevice =    PCI_ANY_ID,
3846         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3847          },
3848         {
3849         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3850         .class_mask =   ~0,
3851         .vendor =       PCI_VENDOR_ID_PLX,
3852         .device =       0x3382,
3853         .subvendor =    PCI_ANY_ID,
3854         .subdevice =    PCI_ANY_ID,
3855         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3856          },
3857 { /* end: all zeroes */ }
3858 };
3859 MODULE_DEVICE_TABLE(pci, pci_ids);
3860
3861 /* pci driver glue; this is a "new style" PCI driver module */
3862 static struct pci_driver net2280_pci_driver = {
3863         .name =         driver_name,
3864         .id_table =     pci_ids,
3865
3866         .probe =        net2280_probe,
3867         .remove =       net2280_remove,
3868         .shutdown =     net2280_shutdown,
3869
3870         /* FIXME add power management support */
3871 };
3872
3873 module_pci_driver(net2280_pci_driver);
3874
3875 MODULE_DESCRIPTION(DRIVER_DESC);
3876 MODULE_AUTHOR("David Brownell");
3877 MODULE_LICENSE("GPL");