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         /* swap new dummy for old, link; fill and maybe activate */
 936         swap(ep->dummy, req->td);
 937         swap(ep->td_dma, req->td_dma);
 938
 939         req->td->dmadesc = cpu_to_le32 (ep->td_dma);
 940
 941         fill_dma_desc(ep, req, valid);
 942 }
 943
 944 static void
 945 done(struct net2280_ep *ep, struct net2280_request *req, int status)
 946 {
 947         struct net2280          *dev;
 948         unsigned                stopped = ep->stopped;
 949
 950         list_del_init(&req->queue);
 951
 952         if (req->req.status == -EINPROGRESS)
 953                 req->req.status = status;
 954         else
 955                 status = req->req.status;
 956
 957         dev = ep->dev;
 958         if (ep->dma)
 959                 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
 960
 961         if (status && status != -ESHUTDOWN)
 962                 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
 963                         ep->ep.name, &req->req, status,
 964                         req->req.actual, req->req.length);
 965
 966         /* don't modify queue heads during completion callback */
 967         ep->stopped = 1;
 968         spin_unlock(&dev->lock);
 969         usb_gadget_giveback_request(&ep->ep, &req->req);
 970         spin_lock(&dev->lock);
 971         ep->stopped = stopped;
 972 }
 973
 974 /*-------------------------------------------------------------------------*/
 975
 976 static int
 977 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 978 {
 979         struct net2280_request  *req;
 980         struct net2280_ep       *ep;
 981         struct net2280          *dev;
 982         unsigned long           flags;
 983         int ret = 0;
 984
 985         /* we always require a cpu-view buffer, so that we can
 986          * always use pio (as fallback or whatever).
 987          */
 988         ep = container_of(_ep, struct net2280_ep, ep);
 989         if (!_ep || (!ep->desc && ep->num != 0)) {
 990                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
 991                 return -EINVAL;
 992         }
 993         req = container_of(_req, struct net2280_request, req);
 994         if (!_req || !_req->complete || !_req->buf ||
 995                                 !list_empty(&req->queue)) {
 996                 ret = -EINVAL;
 997                 goto print_err;
 998         }
 999         if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
1000                 ret = -EDOM;
1001                 goto print_err;
1002         }
1003         dev = ep->dev;
1004         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1005                 ret = -ESHUTDOWN;
1006                 goto print_err;
1007         }
1008
1009         /* FIXME implement PIO fallback for ZLPs with DMA */
1010         if (ep->dma && _req->length == 0) {
1011                 ret = -EOPNOTSUPP;
1012                 goto print_err;
1013         }
1014
1015         /* set up dma mapping in case the caller didn't */
1016         if (ep->dma) {
1017                 ret = usb_gadget_map_request(&dev->gadget, _req,
1018                                 ep->is_in);
1019                 if (ret)
1020                         goto print_err;
1021         }
1022
1023         ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
1024                         _ep->name, _req, _req->length, _req->buf);
1025
1026         spin_lock_irqsave(&dev->lock, flags);
1027
1028         _req->status = -EINPROGRESS;
1029         _req->actual = 0;
1030
1031         /* kickstart this i/o queue? */
1032         if  (list_empty(&ep->queue) && !ep->stopped &&
1033                 !((dev->quirks & PLX_PCIE) && ep->dma &&
1034                   (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1035
1036                 /* use DMA if the endpoint supports it, else pio */
1037                 if (ep->dma)
1038                         start_dma(ep, req);
1039                 else {
1040                         /* maybe there's no control data, just status ack */
1041                         if (ep->num == 0 && _req->length == 0) {
1042                                 allow_status(ep);
1043                                 done(ep, req, 0);
1044                                 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1045                                 goto done;
1046                         }
1047
1048                         /* PIO ... stuff the fifo, or unblock it.  */
1049                         if (ep->is_in)
1050                                 write_fifo(ep, _req);
1051                         else {
1052                                 u32     s;
1053
1054                                 /* OUT FIFO might have packet(s) buffered */
1055                                 s = readl(&ep->regs->ep_stat);
1056                                 if ((s & BIT(FIFO_EMPTY)) == 0) {
1057                                         /* note:  _req->short_not_ok is
1058                                          * ignored here since PIO _always_
1059                                          * stops queue advance here, and
1060                                          * _req->status doesn't change for
1061                                          * short reads (only _req->actual)
1062                                          */
1063                                         if (read_fifo(ep, req) &&
1064                                                         ep->num == 0) {
1065                                                 done(ep, req, 0);
1066                                                 allow_status(ep);
1067                                                 /* don't queue it */
1068                                                 req = NULL;
1069                                         } else if (read_fifo(ep, req) &&
1070                                                         ep->num != 0) {
1071                                                 done(ep, req, 0);
1072                                                 req = NULL;
1073                                         } else
1074                                                 s = readl(&ep->regs->ep_stat);
1075                                 }
1076
1077                                 /* don't NAK, let the fifo fill */
1078                                 if (req && (s & BIT(NAK_OUT_PACKETS)))
1079                                         writel(BIT(CLEAR_NAK_OUT_PACKETS),
1080                                                         &ep->regs->ep_rsp);
1081                         }
1082                 }
1083
1084         } else if (ep->dma) {
1085                 int     valid = 1;
1086
1087                 if (ep->is_in) {
1088                         int     expect;
1089
1090                         /* preventing magic zlps is per-engine state, not
1091                          * per-transfer; irq logic must recover hiccups.
1092                          */
1093                         expect = likely(req->req.zero ||
1094                                 (req->req.length % ep->ep.maxpacket));
1095                         if (expect != ep->in_fifo_validate)
1096                                 valid = 0;
1097                 }
1098                 queue_dma(ep, req, valid);
1099
1100         } /* else the irq handler advances the queue. */
1101
1102         ep->responded = 1;
1103         if (req)
1104                 list_add_tail(&req->queue, &ep->queue);
1105 done:
1106         spin_unlock_irqrestore(&dev->lock, flags);
1107
1108         /* pci writes may still be posted */
1109         return ret;
1110
1111 print_err:
1112         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1113         return ret;
1114 }
1115
1116 static inline void
1117 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1118                 int status)
1119 {
1120         req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1121         done(ep, req, status);
1122 }
1123
1124 static int scan_dma_completions(struct net2280_ep *ep)
1125 {
1126         int num_completed = 0;
1127
1128         /* only look at descriptors that were "naturally" retired,
1129          * so fifo and list head state won't matter
1130          */
1131         while (!list_empty(&ep->queue)) {
1132                 struct net2280_request  *req;
1133                 u32 req_dma_count;
1134
1135                 req = list_entry(ep->queue.next,
1136                                 struct net2280_request, queue);
1137                 if (!req->valid)
1138                         break;
1139                 rmb();
1140                 req_dma_count = le32_to_cpup(&req->td->dmacount);
1141                 if ((req_dma_count & BIT(VALID_BIT)) != 0)
1142                         break;
1143
1144                 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1145                  * cases where DMA must be aborted; this code handles
1146                  * all non-abort DMA completions.
1147                  */
1148                 if (unlikely(req->td->dmadesc == 0)) {
1149                         /* paranoia */
1150                         u32 const ep_dmacount = readl(&ep->dma->dmacount);
1151
1152                         if (ep_dmacount & DMA_BYTE_COUNT_MASK)
1153                                 break;
1154                         /* single transfer mode */
1155                         dma_done(ep, req, req_dma_count, 0);
1156                         num_completed++;
1157                         break;
1158                 } else if (!ep->is_in &&
1159                            (req->req.length % ep->ep.maxpacket) &&
1160                            !(ep->dev->quirks & PLX_PCIE)) {
1161
1162                         u32 const ep_stat = readl(&ep->regs->ep_stat);
1163                         /* AVOID TROUBLE HERE by not issuing short reads from
1164                          * your gadget driver.  That helps avoids errata 0121,
1165                          * 0122, and 0124; not all cases trigger the warning.
1166                          */
1167                         if ((ep_stat & BIT(NAK_OUT_PACKETS)) == 0) {
1168                                 ep_warn(ep->dev, "%s lost packet sync!\n",
1169                                                 ep->ep.name);
1170                                 req->req.status = -EOVERFLOW;
1171                         } else {
1172                                 u32 const ep_avail = readl(&ep->regs->ep_avail);
1173                                 if (ep_avail) {
1174                                         /* fifo gets flushed later */
1175                                         ep->out_overflow = 1;
1176                                         ep_dbg(ep->dev,
1177                                                 "%s dma, discard %d len %d\n",
1178                                                 ep->ep.name, ep_avail,
1179                                                 req->req.length);
1180                                         req->req.status = -EOVERFLOW;
1181                                 }
1182                         }
1183                 }
1184                 dma_done(ep, req, req_dma_count, 0);
1185                 num_completed++;
1186         }
1187
1188         return num_completed;
1189 }
1190
1191 static void restart_dma(struct net2280_ep *ep)
1192 {
1193         struct net2280_request  *req;
1194
1195         if (ep->stopped)
1196                 return;
1197         req = list_entry(ep->queue.next, struct net2280_request, queue);
1198
1199         start_dma(ep, req);
1200 }
1201
1202 static void abort_dma(struct net2280_ep *ep)
1203 {
1204         /* abort the current transfer */
1205         if (likely(!list_empty(&ep->queue))) {
1206                 /* FIXME work around errata 0121, 0122, 0124 */
1207                 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1208                 spin_stop_dma(ep->dma);
1209         } else
1210                 stop_dma(ep->dma);
1211         scan_dma_completions(ep);
1212 }
1213
1214 /* dequeue ALL requests */
1215 static void nuke(struct net2280_ep *ep)
1216 {
1217         struct net2280_request  *req;
1218
1219         /* called with spinlock held */
1220         ep->stopped = 1;
1221         if (ep->dma)
1222                 abort_dma(ep);
1223         while (!list_empty(&ep->queue)) {
1224                 req = list_entry(ep->queue.next,
1225                                 struct net2280_request,
1226                                 queue);
1227                 done(ep, req, -ESHUTDOWN);
1228         }
1229 }
1230
1231 /* dequeue JUST ONE request */
1232 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1233 {
1234         struct net2280_ep       *ep;
1235         struct net2280_request  *req = NULL;
1236         struct net2280_request  *iter;
1237         unsigned long           flags;
1238         u32                     dmactl;
1239         int                     stopped;
1240
1241         ep = container_of(_ep, struct net2280_ep, ep);
1242         if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1243                 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1244                                                 __func__, _ep, _req);
1245                 return -EINVAL;
1246         }
1247
1248         spin_lock_irqsave(&ep->dev->lock, flags);
1249         stopped = ep->stopped;
1250
1251         /* quiesce dma while we patch the queue */
1252         dmactl = 0;
1253         ep->stopped = 1;
1254         if (ep->dma) {
1255                 dmactl = readl(&ep->dma->dmactl);
1256                 /* WARNING erratum 0127 may kick in ... */
1257                 stop_dma(ep->dma);
1258                 scan_dma_completions(ep);
1259         }
1260
1261         /* make sure it's still queued on this endpoint */
1262         list_for_each_entry(iter, &ep->queue, queue) {
1263                 if (&iter->req != _req)
1264                         continue;
1265                 req = iter;
1266                 break;
1267         }
1268         if (!req) {
1269                 ep->stopped = stopped;
1270                 spin_unlock_irqrestore(&ep->dev->lock, flags);
1271                 ep_dbg(ep->dev, "%s: Request mismatch\n", __func__);
1272                 return -EINVAL;
1273         }
1274
1275         /* queue head may be partially complete. */
1276         if (ep->queue.next == &req->queue) {
1277                 if (ep->dma) {
1278                         ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1279                         _req->status = -ECONNRESET;
1280                         abort_dma(ep);
1281                         if (likely(ep->queue.next == &req->queue)) {
1282                                 /* NOTE: misreports single-transfer mode*/
1283                                 req->td->dmacount = 0;  /* invalidate */
1284                                 dma_done(ep, req,
1285                                         readl(&ep->dma->dmacount),
1286                                         -ECONNRESET);
1287                         }
1288                 } else {
1289                         ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1290                         done(ep, req, -ECONNRESET);
1291                 }
1292                 req = NULL;
1293         }
1294
1295         if (req)
1296                 done(ep, req, -ECONNRESET);
1297         ep->stopped = stopped;
1298
1299         if (ep->dma) {
1300                 /* turn off dma on inactive queues */
1301                 if (list_empty(&ep->queue))
1302                         stop_dma(ep->dma);
1303                 else if (!ep->stopped) {
1304                         /* resume current request, or start new one */
1305                         if (req)
1306                                 writel(dmactl, &ep->dma->dmactl);
1307                         else
1308                                 start_dma(ep, list_entry(ep->queue.next,
1309                                         struct net2280_request, queue));
1310                 }
1311         }
1312
1313         spin_unlock_irqrestore(&ep->dev->lock, flags);
1314         return 0;
1315 }
1316
1317 /*-------------------------------------------------------------------------*/
1318
1319 static int net2280_fifo_status(struct usb_ep *_ep);
1320
1321 static int
1322 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1323 {
1324         struct net2280_ep       *ep;
1325         unsigned long           flags;
1326         int                     retval = 0;
1327
1328         ep = container_of(_ep, struct net2280_ep, ep);
1329         if (!_ep || (!ep->desc && ep->num != 0)) {
1330                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1331                 return -EINVAL;
1332         }
1333         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1334                 retval = -ESHUTDOWN;
1335                 goto print_err;
1336         }
1337         if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1338                                                 == USB_ENDPOINT_XFER_ISOC) {
1339                 retval = -EINVAL;
1340                 goto print_err;
1341         }
1342
1343         spin_lock_irqsave(&ep->dev->lock, flags);
1344         if (!list_empty(&ep->queue)) {
1345                 retval = -EAGAIN;
1346                 goto print_unlock;
1347         } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1348                 retval = -EAGAIN;
1349                 goto print_unlock;
1350         } else {
1351                 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1352                                 value ? "set" : "clear",
1353                                 wedged ? "wedge" : "halt");
1354                 /* set/clear, then synch memory views with the device */
1355                 if (value) {
1356                         if (ep->num == 0)
1357                                 ep->dev->protocol_stall = 1;
1358                         else
1359                                 set_halt(ep);
1360                         if (wedged)
1361                                 ep->wedged = 1;
1362                 } else {
1363                         clear_halt(ep);
1364                         if (ep->dev->quirks & PLX_PCIE &&
1365                                 !list_empty(&ep->queue) && ep->td_dma)
1366                                         restart_dma(ep);
1367                         ep->wedged = 0;
1368                 }
1369                 (void) readl(&ep->regs->ep_rsp);
1370         }
1371         spin_unlock_irqrestore(&ep->dev->lock, flags);
1372
1373         return retval;
1374
1375 print_unlock:
1376         spin_unlock_irqrestore(&ep->dev->lock, flags);
1377 print_err:
1378         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1379         return retval;
1380 }
1381
1382 static int net2280_set_halt(struct usb_ep *_ep, int value)
1383 {
1384         return net2280_set_halt_and_wedge(_ep, value, 0);
1385 }
1386
1387 static int net2280_set_wedge(struct usb_ep *_ep)
1388 {
1389         if (!_ep || _ep->name == ep0name) {
1390                 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1391                 return -EINVAL;
1392         }
1393         return net2280_set_halt_and_wedge(_ep, 1, 1);
1394 }
1395
1396 static int net2280_fifo_status(struct usb_ep *_ep)
1397 {
1398         struct net2280_ep       *ep;
1399         u32                     avail;
1400
1401         ep = container_of(_ep, struct net2280_ep, ep);
1402         if (!_ep || (!ep->desc && ep->num != 0)) {
1403                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1404                 return -ENODEV;
1405         }
1406         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1407                 dev_err(&ep->dev->pdev->dev,
1408                         "%s: Invalid driver=%p or speed=%d\n",
1409                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1410                 return -ESHUTDOWN;
1411         }
1412
1413         avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1414         if (avail > ep->fifo_size) {
1415                 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1416                 return -EOVERFLOW;
1417         }
1418         if (ep->is_in)
1419                 avail = ep->fifo_size - avail;
1420         return avail;
1421 }
1422
1423 static void net2280_fifo_flush(struct usb_ep *_ep)
1424 {
1425         struct net2280_ep       *ep;
1426
1427         ep = container_of(_ep, struct net2280_ep, ep);
1428         if (!_ep || (!ep->desc && ep->num != 0)) {
1429                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1430                 return;
1431         }
1432         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1433                 dev_err(&ep->dev->pdev->dev,
1434                         "%s: Invalid driver=%p or speed=%d\n",
1435                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1436                 return;
1437         }
1438
1439         writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1440         (void) readl(&ep->regs->ep_rsp);
1441 }
1442
1443 static const struct usb_ep_ops net2280_ep_ops = {
1444         .enable         = net2280_enable,
1445         .disable        = net2280_disable,
1446
1447         .alloc_request  = net2280_alloc_request,
1448         .free_request   = net2280_free_request,
1449
1450         .queue          = net2280_queue,
1451         .dequeue        = net2280_dequeue,
1452
1453         .set_halt       = net2280_set_halt,
1454         .set_wedge      = net2280_set_wedge,
1455         .fifo_status    = net2280_fifo_status,
1456         .fifo_flush     = net2280_fifo_flush,
1457 };
1458
1459 /*-------------------------------------------------------------------------*/
1460
1461 static int net2280_get_frame(struct usb_gadget *_gadget)
1462 {
1463         struct net2280          *dev;
1464         unsigned long           flags;
1465         u16                     retval;
1466
1467         if (!_gadget)
1468                 return -ENODEV;
1469         dev = container_of(_gadget, struct net2280, gadget);
1470         spin_lock_irqsave(&dev->lock, flags);
1471         retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1472         spin_unlock_irqrestore(&dev->lock, flags);
1473         return retval;
1474 }
1475
1476 static int net2280_wakeup(struct usb_gadget *_gadget)
1477 {
1478         struct net2280          *dev;
1479         u32                     tmp;
1480         unsigned long           flags;
1481
1482         if (!_gadget)
1483                 return 0;
1484         dev = container_of(_gadget, struct net2280, gadget);
1485
1486         spin_lock_irqsave(&dev->lock, flags);
1487         tmp = readl(&dev->usb->usbctl);
1488         if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1489                 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1490         spin_unlock_irqrestore(&dev->lock, flags);
1491
1492         /* pci writes may still be posted */
1493         return 0;
1494 }
1495
1496 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1497 {
1498         struct net2280          *dev;
1499         u32                     tmp;
1500         unsigned long           flags;
1501
1502         if (!_gadget)
1503                 return 0;
1504         dev = container_of(_gadget, struct net2280, gadget);
1505
1506         spin_lock_irqsave(&dev->lock, flags);
1507         tmp = readl(&dev->usb->usbctl);
1508         if (value) {
1509                 tmp |= BIT(SELF_POWERED_STATUS);
1510                 _gadget->is_selfpowered = 1;
1511         } else {
1512                 tmp &= ~BIT(SELF_POWERED_STATUS);
1513                 _gadget->is_selfpowered = 0;
1514         }
1515         writel(tmp, &dev->usb->usbctl);
1516         spin_unlock_irqrestore(&dev->lock, flags);
1517
1518         return 0;
1519 }
1520
1521 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1522 {
1523         struct net2280  *dev;
1524         u32             tmp;
1525         unsigned long   flags;
1526
1527         if (!_gadget)
1528                 return -ENODEV;
1529         dev = container_of(_gadget, struct net2280, gadget);
1530
1531         spin_lock_irqsave(&dev->lock, flags);
1532         tmp = readl(&dev->usb->usbctl);
1533         dev->softconnect = (is_on != 0);
1534         if (is_on) {
1535                 ep0_start(dev);
1536                 writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1537         } else {
1538                 writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1539                 stop_activity(dev, NULL);
1540         }
1541
1542         spin_unlock_irqrestore(&dev->lock, flags);
1543
1544         return 0;
1545 }
1546
1547 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1548                 struct usb_endpoint_descriptor *desc,
1549                 struct usb_ss_ep_comp_descriptor *ep_comp)
1550 {
1551         char name[8];
1552         struct usb_ep *ep;
1553
1554         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1555                 /* ep-e, ep-f are PIO with only 64 byte fifos */
1556                 ep = gadget_find_ep_by_name(_gadget, "ep-e");
1557                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1558                         return ep;
1559                 ep = gadget_find_ep_by_name(_gadget, "ep-f");
1560                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1561                         return ep;
1562         }
1563
1564         /* USB3380: Only first four endpoints have DMA channels. Allocate
1565          * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc
1566          * endpoints use DMA hw endpoints.
1567          */
1568         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1569             usb_endpoint_dir_in(desc)) {
1570                 ep = gadget_find_ep_by_name(_gadget, "ep2in");
1571                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1572                         return ep;
1573                 ep = gadget_find_ep_by_name(_gadget, "ep4in");
1574                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1575                         return ep;
1576         } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1577                    !usb_endpoint_dir_in(desc)) {
1578                 ep = gadget_find_ep_by_name(_gadget, "ep1out");
1579                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1580                         return ep;
1581                 ep = gadget_find_ep_by_name(_gadget, "ep3out");
1582                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1583                         return ep;
1584         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1585                    usb_endpoint_dir_in(desc)) {
1586                 ep = gadget_find_ep_by_name(_gadget, "ep1in");
1587                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1588                         return ep;
1589                 ep = gadget_find_ep_by_name(_gadget, "ep3in");
1590                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1591                         return ep;
1592         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1593                    !usb_endpoint_dir_in(desc)) {
1594                 ep = gadget_find_ep_by_name(_gadget, "ep2out");
1595                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1596                         return ep;
1597                 ep = gadget_find_ep_by_name(_gadget, "ep4out");
1598                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1599                         return ep;
1600         }
1601
1602         /* USB3380: use same address for usb and hardware endpoints */
1603         snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1604                         usb_endpoint_dir_in(desc) ? "in" : "out");
1605         ep = gadget_find_ep_by_name(_gadget, name);
1606         if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1607                 return ep;
1608
1609         return NULL;
1610 }
1611
1612 static int net2280_start(struct usb_gadget *_gadget,
1613                 struct usb_gadget_driver *driver);
1614 static int net2280_stop(struct usb_gadget *_gadget);
1615 static void net2280_async_callbacks(struct usb_gadget *_gadget, bool enable);
1616
1617 static const struct usb_gadget_ops net2280_ops = {
1618         .get_frame      = net2280_get_frame,
1619         .wakeup         = net2280_wakeup,
1620         .set_selfpowered = net2280_set_selfpowered,
1621         .pullup         = net2280_pullup,
1622         .udc_start      = net2280_start,
1623         .udc_stop       = net2280_stop,
1624         .udc_async_callbacks = net2280_async_callbacks,
1625         .match_ep       = net2280_match_ep,
1626 };
1627
1628 /*-------------------------------------------------------------------------*/
1629
1630 #ifdef  CONFIG_USB_GADGET_DEBUG_FILES
1631
1632 /* FIXME move these into procfs, and use seq_file.
1633  * Sysfs _still_ doesn't behave for arbitrarily sized files,
1634  * and also doesn't help products using this with 2.4 kernels.
1635  */
1636
1637 /* "function" sysfs attribute */
1638 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1639                              char *buf)
1640 {
1641         struct net2280  *dev = dev_get_drvdata(_dev);
1642
1643         if (!dev->driver || !dev->driver->function ||
1644                         strlen(dev->driver->function) > PAGE_SIZE)
1645                 return 0;
1646         return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1647 }
1648 static DEVICE_ATTR_RO(function);
1649
1650 static ssize_t registers_show(struct device *_dev,
1651                               struct device_attribute *attr, char *buf)
1652 {
1653         struct net2280          *dev;
1654         char                    *next;
1655         unsigned                size, t;
1656         unsigned long           flags;
1657         int                     i;
1658         u32                     t1, t2;
1659         const char              *s;
1660
1661         dev = dev_get_drvdata(_dev);
1662         next = buf;
1663         size = PAGE_SIZE;
1664         spin_lock_irqsave(&dev->lock, flags);
1665
1666         if (dev->driver)
1667                 s = dev->driver->driver.name;
1668         else
1669                 s = "(none)";
1670
1671         /* Main Control Registers */
1672         t = scnprintf(next, size, "%s version " DRIVER_VERSION
1673                         ", chiprev %04x\n\n"
1674                         "devinit %03x fifoctl %08x gadget '%s'\n"
1675                         "pci irqenb0 %02x irqenb1 %08x "
1676                         "irqstat0 %04x irqstat1 %08x\n",
1677                         driver_name, dev->chiprev,
1678                         readl(&dev->regs->devinit),
1679                         readl(&dev->regs->fifoctl),
1680                         s,
1681                         readl(&dev->regs->pciirqenb0),
1682                         readl(&dev->regs->pciirqenb1),
1683                         readl(&dev->regs->irqstat0),
1684                         readl(&dev->regs->irqstat1));
1685         size -= t;
1686         next += t;
1687
1688         /* USB Control Registers */
1689         t1 = readl(&dev->usb->usbctl);
1690         t2 = readl(&dev->usb->usbstat);
1691         if (t1 & BIT(VBUS_PIN)) {
1692                 if (t2 & BIT(HIGH_SPEED))
1693                         s = "high speed";
1694                 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1695                         s = "powered";
1696                 else
1697                         s = "full speed";
1698                 /* full speed bit (6) not working?? */
1699         } else
1700                         s = "not attached";
1701         t = scnprintf(next, size,
1702                         "stdrsp %08x usbctl %08x usbstat %08x "
1703                                 "addr 0x%02x (%s)\n",
1704                         readl(&dev->usb->stdrsp), t1, t2,
1705                         readl(&dev->usb->ouraddr), s);
1706         size -= t;
1707         next += t;
1708
1709         /* PCI Master Control Registers */
1710
1711         /* DMA Control Registers */
1712
1713         /* Configurable EP Control Registers */
1714         for (i = 0; i < dev->n_ep; i++) {
1715                 struct net2280_ep       *ep;
1716
1717                 ep = &dev->ep[i];
1718                 if (i && !ep->desc)
1719                         continue;
1720
1721                 t1 = readl(&ep->cfg->ep_cfg);
1722                 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1723                 t = scnprintf(next, size,
1724                                 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1725                                         "irqenb %02x\n",
1726                                 ep->ep.name, t1, t2,
1727                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1728                                         ? "NAK " : "",
1729                                 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1730                                         ? "hide " : "",
1731                                 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1732                                         ? "CRC " : "",
1733                                 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1734                                         ? "interrupt " : "",
1735                                 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1736                                         ? "status " : "",
1737                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1738                                         ? "NAKmode " : "",
1739                                 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1740                                         ? "DATA1 " : "DATA0 ",
1741                                 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1742                                         ? "HALT " : "",
1743                                 readl(&ep->regs->ep_irqenb));
1744                 size -= t;
1745                 next += t;
1746
1747                 t = scnprintf(next, size,
1748                                 "\tstat %08x avail %04x "
1749                                 "(ep%d%s-%s)%s\n",
1750                                 readl(&ep->regs->ep_stat),
1751                                 readl(&ep->regs->ep_avail),
1752                                 t1 & 0x0f, DIR_STRING(t1),
1753                                 type_string(t1 >> 8),
1754                                 ep->stopped ? "*" : "");
1755                 size -= t;
1756                 next += t;
1757
1758                 if (!ep->dma)
1759                         continue;
1760
1761                 t = scnprintf(next, size,
1762                                 "  dma\tctl %08x stat %08x count %08x\n"
1763                                 "\taddr %08x desc %08x\n",
1764                                 readl(&ep->dma->dmactl),
1765                                 readl(&ep->dma->dmastat),
1766                                 readl(&ep->dma->dmacount),
1767                                 readl(&ep->dma->dmaaddr),
1768                                 readl(&ep->dma->dmadesc));
1769                 size -= t;
1770                 next += t;
1771
1772         }
1773
1774         /* Indexed Registers (none yet) */
1775
1776         /* Statistics */
1777         t = scnprintf(next, size, "\nirqs:  ");
1778         size -= t;
1779         next += t;
1780         for (i = 0; i < dev->n_ep; i++) {
1781                 struct net2280_ep       *ep;
1782
1783                 ep = &dev->ep[i];
1784                 if (i && !ep->irqs)
1785                         continue;
1786                 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1787                 size -= t;
1788                 next += t;
1789
1790         }
1791         t = scnprintf(next, size, "\n");
1792         size -= t;
1793         next += t;
1794
1795         spin_unlock_irqrestore(&dev->lock, flags);
1796
1797         return PAGE_SIZE - size;
1798 }
1799 static DEVICE_ATTR_RO(registers);
1800
1801 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1802                            char *buf)
1803 {
1804         struct net2280          *dev;
1805         char                    *next;
1806         unsigned                size;
1807         unsigned long           flags;
1808         int                     i;
1809
1810         dev = dev_get_drvdata(_dev);
1811         next = buf;
1812         size = PAGE_SIZE;
1813         spin_lock_irqsave(&dev->lock, flags);
1814
1815         for (i = 0; i < dev->n_ep; i++) {
1816                 struct net2280_ep               *ep = &dev->ep[i];
1817                 struct net2280_request          *req;
1818                 int                             t;
1819
1820                 if (i != 0) {
1821                         const struct usb_endpoint_descriptor    *d;
1822
1823                         d = ep->desc;
1824                         if (!d)
1825                                 continue;
1826                         t = d->bEndpointAddress;
1827                         t = scnprintf(next, size,
1828                                 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1829                                 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1830                                 (t & USB_DIR_IN) ? "in" : "out",
1831                                 type_string(d->bmAttributes),
1832                                 usb_endpoint_maxp(d),
1833                                 ep->dma ? "dma" : "pio", ep->fifo_size
1834                                 );
1835                 } else /* ep0 should only have one transfer queued */
1836                         t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1837                                         ep->is_in ? "in" : "out");
1838                 if (t <= 0 || t > size)
1839                         goto done;
1840                 size -= t;
1841                 next += t;
1842
1843                 if (list_empty(&ep->queue)) {
1844                         t = scnprintf(next, size, "\t(nothing queued)\n");
1845                         if (t <= 0 || t > size)
1846                                 goto done;
1847                         size -= t;
1848                         next += t;
1849                         continue;
1850                 }
1851                 list_for_each_entry(req, &ep->queue, queue) {
1852                         if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1853                                 t = scnprintf(next, size,
1854                                         "\treq %p len %d/%d "
1855                                         "buf %p (dmacount %08x)\n",
1856                                         &req->req, req->req.actual,
1857                                         req->req.length, req->req.buf,
1858                                         readl(&ep->dma->dmacount));
1859                         else
1860                                 t = scnprintf(next, size,
1861                                         "\treq %p len %d/%d buf %p\n",
1862                                         &req->req, req->req.actual,
1863                                         req->req.length, req->req.buf);
1864                         if (t <= 0 || t > size)
1865                                 goto done;
1866                         size -= t;
1867                         next += t;
1868
1869                         if (ep->dma) {
1870                                 struct net2280_dma      *td;
1871
1872                                 td = req->td;
1873                                 t = scnprintf(next, size, "\t    td %08x "
1874                                         " count %08x buf %08x desc %08x\n",
1875                                         (u32) req->td_dma,
1876                                         le32_to_cpu(td->dmacount),
1877                                         le32_to_cpu(td->dmaaddr),
1878                                         le32_to_cpu(td->dmadesc));
1879                                 if (t <= 0 || t > size)
1880                                         goto done;
1881                                 size -= t;
1882                                 next += t;
1883                         }
1884                 }
1885         }
1886
1887 done:
1888         spin_unlock_irqrestore(&dev->lock, flags);
1889         return PAGE_SIZE - size;
1890 }
1891 static DEVICE_ATTR_RO(queues);
1892
1893
1894 #else
1895
1896 #define device_create_file(a, b)        (0)
1897 #define device_remove_file(a, b)        do { } while (0)
1898
1899 #endif
1900
1901 /*-------------------------------------------------------------------------*/
1902
1903 /* another driver-specific mode might be a request type doing dma
1904  * to/from another device fifo instead of to/from memory.
1905  */
1906
1907 static void set_fifo_mode(struct net2280 *dev, int mode)
1908 {
1909         /* keeping high bits preserves BAR2 */
1910         writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1911
1912         /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1913         INIT_LIST_HEAD(&dev->gadget.ep_list);
1914         list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1915         list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1916         switch (mode) {
1917         case 0:
1918                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1919                 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1920                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1921                 break;
1922         case 1:
1923                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1924                 break;
1925         case 2:
1926                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1927                 dev->ep[1].fifo_size = 2048;
1928                 dev->ep[2].fifo_size = 1024;
1929                 break;
1930         }
1931         /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1932         list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1933         list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1934 }
1935
1936 static void defect7374_disable_data_eps(struct net2280 *dev)
1937 {
1938         /*
1939          * For Defect 7374, disable data EPs (and more):
1940          *  - This phase undoes the earlier phase of the Defect 7374 workaround,
1941          *    returing ep regs back to normal.
1942          */
1943         struct net2280_ep *ep;
1944         int i;
1945         unsigned char ep_sel;
1946         u32 tmp_reg;
1947
1948         for (i = 1; i < 5; i++) {
1949                 ep = &dev->ep[i];
1950                 writel(i, &ep->cfg->ep_cfg);
1951         }
1952
1953         /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1954         for (i = 0; i < 6; i++)
1955                 writel(0, &dev->dep[i].dep_cfg);
1956
1957         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1958                 /* Select an endpoint for subsequent operations: */
1959                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1960                 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1961
1962                 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1963                                         ep_sel == 18 || ep_sel == 20)
1964                         continue;
1965
1966                 /* Change settings on some selected endpoints */
1967                 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1968                 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1969                 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1970                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1971                 tmp_reg |= BIT(EP_INITIALIZED);
1972                 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1973         }
1974 }
1975
1976 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1977 {
1978         u32 tmp = 0, tmp_reg;
1979         u32 scratch;
1980         int i;
1981         unsigned char ep_sel;
1982
1983         scratch = get_idx_reg(dev->regs, SCRATCH);
1984
1985         WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1986                 == DEFECT7374_FSM_SS_CONTROL_READ);
1987
1988         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
1989
1990         ep_warn(dev, "Operate Defect 7374 workaround soft this time");
1991         ep_warn(dev, "It will operate on cold-reboot and SS connect");
1992
1993         /*GPEPs:*/
1994         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
1995                         (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
1996                         ((dev->enhanced_mode) ?
1997                          BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
1998                          BIT(ENDPOINT_ENABLE)));
1999
2000         for (i = 1; i < 5; i++)
2001                 writel(tmp, &dev->ep[i].cfg->ep_cfg);
2002
2003         /* CSRIN, PCIIN, STATIN, RCIN*/
2004         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
2005         writel(tmp, &dev->dep[1].dep_cfg);
2006         writel(tmp, &dev->dep[3].dep_cfg);
2007         writel(tmp, &dev->dep[4].dep_cfg);
2008         writel(tmp, &dev->dep[5].dep_cfg);
2009
2010         /*Implemented for development and debug.
2011          * Can be refined/tuned later.*/
2012         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
2013                 /* Select an endpoint for subsequent operations: */
2014                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
2015                 writel(((tmp_reg & ~0x1f) | ep_sel),
2016                                 &dev->plregs->pl_ep_ctrl);
2017
2018                 if (ep_sel == 1) {
2019                         tmp =
2020                                 (readl(&dev->plregs->pl_ep_ctrl) |
2021                                  BIT(CLEAR_ACK_ERROR_CODE) | 0);
2022                         writel(tmp, &dev->plregs->pl_ep_ctrl);
2023                         continue;
2024                 }
2025
2026                 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
2027                                 ep_sel == 18  || ep_sel == 20)
2028                         continue;
2029
2030                 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
2031                                 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
2032                 writel(tmp, &dev->plregs->pl_ep_cfg_4);
2033
2034                 tmp = readl(&dev->plregs->pl_ep_ctrl) &
2035                         ~BIT(EP_INITIALIZED);
2036                 writel(tmp, &dev->plregs->pl_ep_ctrl);
2037
2038         }
2039
2040         /* Set FSM to focus on the first Control Read:
2041          * - Tip: Connection speed is known upon the first
2042          * setup request.*/
2043         scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2044         set_idx_reg(dev->regs, SCRATCH, scratch);
2045
2046 }
2047
2048 /* keeping it simple:
2049  * - one bus driver, initted first;
2050  * - one function driver, initted second
2051  *
2052  * most of the work to support multiple net2280 controllers would
2053  * be to associate this gadget driver (yes?) with all of them, or
2054  * perhaps to bind specific drivers to specific devices.
2055  */
2056
2057 static void usb_reset_228x(struct net2280 *dev)
2058 {
2059         u32     tmp;
2060
2061         dev->gadget.speed = USB_SPEED_UNKNOWN;
2062         (void) readl(&dev->usb->usbctl);
2063
2064         net2280_led_init(dev);
2065
2066         /* disable automatic responses, and irqs */
2067         writel(0, &dev->usb->stdrsp);
2068         writel(0, &dev->regs->pciirqenb0);
2069         writel(0, &dev->regs->pciirqenb1);
2070
2071         /* clear old dma and irq state */
2072         for (tmp = 0; tmp < 4; tmp++) {
2073                 struct net2280_ep       *ep = &dev->ep[tmp + 1];
2074                 if (ep->dma)
2075                         abort_dma(ep);
2076         }
2077
2078         writel(~0, &dev->regs->irqstat0),
2079         writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2080
2081         /* reset, and enable pci */
2082         tmp = readl(&dev->regs->devinit) |
2083                 BIT(PCI_ENABLE) |
2084                 BIT(FIFO_SOFT_RESET) |
2085                 BIT(USB_SOFT_RESET) |
2086                 BIT(M8051_RESET);
2087         writel(tmp, &dev->regs->devinit);
2088
2089         /* standard fifo and endpoint allocations */
2090         set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2091 }
2092
2093 static void usb_reset_338x(struct net2280 *dev)
2094 {
2095         u32 tmp;
2096
2097         dev->gadget.speed = USB_SPEED_UNKNOWN;
2098         (void)readl(&dev->usb->usbctl);
2099
2100         net2280_led_init(dev);
2101
2102         if (dev->bug7734_patched) {
2103                 /* disable automatic responses, and irqs */
2104                 writel(0, &dev->usb->stdrsp);
2105                 writel(0, &dev->regs->pciirqenb0);
2106                 writel(0, &dev->regs->pciirqenb1);
2107         }
2108
2109         /* clear old dma and irq state */
2110         for (tmp = 0; tmp < 4; tmp++) {
2111                 struct net2280_ep *ep = &dev->ep[tmp + 1];
2112                 struct net2280_dma_regs __iomem *dma;
2113
2114                 if (ep->dma) {
2115                         abort_dma(ep);
2116                 } else {
2117                         dma = &dev->dma[tmp];
2118                         writel(BIT(DMA_ABORT), &dma->dmastat);
2119                         writel(0, &dma->dmactl);
2120                 }
2121         }
2122
2123         writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2124
2125         if (dev->bug7734_patched) {
2126                 /* reset, and enable pci */
2127                 tmp = readl(&dev->regs->devinit) |
2128                     BIT(PCI_ENABLE) |
2129                     BIT(FIFO_SOFT_RESET) |
2130                     BIT(USB_SOFT_RESET) |
2131                     BIT(M8051_RESET);
2132
2133                 writel(tmp, &dev->regs->devinit);
2134         }
2135
2136         /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2137         INIT_LIST_HEAD(&dev->gadget.ep_list);
2138
2139         for (tmp = 1; tmp < dev->n_ep; tmp++)
2140                 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2141
2142 }
2143
2144 static void usb_reset(struct net2280 *dev)
2145 {
2146         if (dev->quirks & PLX_LEGACY)
2147                 return usb_reset_228x(dev);
2148         return usb_reset_338x(dev);
2149 }
2150
2151 static void usb_reinit_228x(struct net2280 *dev)
2152 {
2153         u32     tmp;
2154
2155         /* basic endpoint init */
2156         for (tmp = 0; tmp < 7; tmp++) {
2157                 struct net2280_ep       *ep = &dev->ep[tmp];
2158
2159                 ep->ep.name = ep_info_dft[tmp].name;
2160                 ep->ep.caps = ep_info_dft[tmp].caps;
2161                 ep->dev = dev;
2162                 ep->num = tmp;
2163
2164                 if (tmp > 0 && tmp <= 4) {
2165                         ep->fifo_size = 1024;
2166                         ep->dma = &dev->dma[tmp - 1];
2167                 } else
2168                         ep->fifo_size = 64;
2169                 ep->regs = &dev->epregs[tmp];
2170                 ep->cfg = &dev->epregs[tmp];
2171                 ep_reset_228x(dev->regs, ep);
2172         }
2173         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2174         usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2175         usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2176
2177         dev->gadget.ep0 = &dev->ep[0].ep;
2178         dev->ep[0].stopped = 0;
2179         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2180
2181         /* we want to prevent lowlevel/insecure access from the USB host,
2182          * but erratum 0119 means this enable bit is ignored
2183          */
2184         for (tmp = 0; tmp < 5; tmp++)
2185                 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2186 }
2187
2188 static void usb_reinit_338x(struct net2280 *dev)
2189 {
2190         int i;
2191         u32 tmp, val;
2192         static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2193         static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2194                                                 0x00, 0xC0, 0x00, 0xC0 };
2195
2196         /* basic endpoint init */
2197         for (i = 0; i < dev->n_ep; i++) {
2198                 struct net2280_ep *ep = &dev->ep[i];
2199
2200                 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2201                                                    ep_info_dft[i].name;
2202                 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2203                                                    ep_info_dft[i].caps;
2204                 ep->dev = dev;
2205                 ep->num = i;
2206
2207                 if (i > 0 && i <= 4)
2208                         ep->dma = &dev->dma[i - 1];
2209
2210                 if (dev->enhanced_mode) {
2211                         ep->cfg = &dev->epregs[ne[i]];
2212                         /*
2213                          * Set USB endpoint number, hardware allows same number
2214                          * in both directions.
2215                          */
2216                          if (i > 0 && i < 5)
2217                                 writel(ne[i], &ep->cfg->ep_cfg);
2218                         ep->regs = (struct net2280_ep_regs __iomem *)
2219                                 (((void __iomem *)&dev->epregs[ne[i]]) +
2220                                 ep_reg_addr[i]);
2221                 } else {
2222                         ep->cfg = &dev->epregs[i];
2223                         ep->regs = &dev->epregs[i];
2224                 }
2225
2226                 ep->fifo_size = (i != 0) ? 2048 : 512;
2227
2228                 ep_reset_338x(dev->regs, ep);
2229         }
2230         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2231
2232         dev->gadget.ep0 = &dev->ep[0].ep;
2233         dev->ep[0].stopped = 0;
2234
2235         /* Link layer set up */
2236         if (dev->bug7734_patched) {
2237                 tmp = readl(&dev->usb_ext->usbctl2) &
2238                     ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2239                 writel(tmp, &dev->usb_ext->usbctl2);
2240         }
2241
2242         /* Hardware Defect and Workaround */
2243         val = readl(&dev->llregs->ll_lfps_5);
2244         val &= ~(0xf << TIMER_LFPS_6US);
2245         val |= 0x5 << TIMER_LFPS_6US;
2246         writel(val, &dev->llregs->ll_lfps_5);
2247
2248         val = readl(&dev->llregs->ll_lfps_6);
2249         val &= ~(0xffff << TIMER_LFPS_80US);
2250         val |= 0x0100 << TIMER_LFPS_80US;
2251         writel(val, &dev->llregs->ll_lfps_6);
2252
2253         /*
2254          * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2255          * Hot Reset Exit Handshake may Fail in Specific Case using
2256          * Default Register Settings. Workaround for Enumeration test.
2257          */
2258         val = readl(&dev->llregs->ll_tsn_counters_2);
2259         val &= ~(0x1f << HOT_TX_NORESET_TS2);
2260         val |= 0x10 << HOT_TX_NORESET_TS2;
2261         writel(val, &dev->llregs->ll_tsn_counters_2);
2262
2263         val = readl(&dev->llregs->ll_tsn_counters_3);
2264         val &= ~(0x1f << HOT_RX_RESET_TS2);
2265         val |= 0x3 << HOT_RX_RESET_TS2;
2266         writel(val, &dev->llregs->ll_tsn_counters_3);
2267
2268         /*
2269          * AB errata. Errata 11. Workaround for Default Duration of LFPS
2270          * Handshake Signaling for Device-Initiated U1 Exit is too short.
2271          * Without this, various enumeration failures observed with
2272          * modern superspeed hosts.
2273          */
2274         val = readl(&dev->llregs->ll_lfps_timers_2);
2275         writel((val & 0xffff0000) | LFPS_TIMERS_2_WORKAROUND_VALUE,
2276                &dev->llregs->ll_lfps_timers_2);
2277
2278         /*
2279          * Set Recovery Idle to Recover bit:
2280          * - On SS connections, setting Recovery Idle to Recover Fmw improves
2281          *   link robustness with various hosts and hubs.
2282          * - It is safe to set for all connection speeds; all chip revisions.
2283          * - R-M-W to leave other bits undisturbed.
2284          * - Reference PLX TT-7372
2285         */
2286         val = readl(&dev->llregs->ll_tsn_chicken_bit);
2287         val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2288         writel(val, &dev->llregs->ll_tsn_chicken_bit);
2289
2290         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2291
2292         /* disable dedicated endpoints */
2293         writel(0x0D, &dev->dep[0].dep_cfg);
2294         writel(0x0D, &dev->dep[1].dep_cfg);
2295         writel(0x0E, &dev->dep[2].dep_cfg);
2296         writel(0x0E, &dev->dep[3].dep_cfg);
2297         writel(0x0F, &dev->dep[4].dep_cfg);
2298         writel(0x0C, &dev->dep[5].dep_cfg);
2299 }
2300
2301 static void usb_reinit(struct net2280 *dev)
2302 {
2303         if (dev->quirks & PLX_LEGACY)
2304                 return usb_reinit_228x(dev);
2305         return usb_reinit_338x(dev);
2306 }
2307
2308 static void ep0_start_228x(struct net2280 *dev)
2309 {
2310         writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2311                 BIT(CLEAR_NAK_OUT_PACKETS) |
2312                 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2313                 &dev->epregs[0].ep_rsp);
2314
2315         /*
2316          * hardware optionally handles a bunch of standard requests
2317          * that the API hides from drivers anyway.  have it do so.
2318          * endpoint status/features are handled in software, to
2319          * help pass tests for some dubious behavior.
2320          */
2321         writel(BIT(SET_TEST_MODE) |
2322                 BIT(SET_ADDRESS) |
2323                 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2324                 BIT(GET_DEVICE_STATUS) |
2325                 BIT(GET_INTERFACE_STATUS),
2326                 &dev->usb->stdrsp);
2327         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2328                 BIT(SELF_POWERED_USB_DEVICE) |
2329                 BIT(REMOTE_WAKEUP_SUPPORT) |
2330                 (dev->softconnect << USB_DETECT_ENABLE) |
2331                 BIT(SELF_POWERED_STATUS),
2332                 &dev->usb->usbctl);
2333
2334         /* enable irqs so we can see ep0 and general operation  */
2335         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2336                 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2337                 &dev->regs->pciirqenb0);
2338         writel(BIT(PCI_INTERRUPT_ENABLE) |
2339                 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2340                 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2341                 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2342                 BIT(VBUS_INTERRUPT_ENABLE) |
2343                 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2344                 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2345                 &dev->regs->pciirqenb1);
2346
2347         /* don't leave any writes posted */
2348         (void) readl(&dev->usb->usbctl);
2349 }
2350
2351 static void ep0_start_338x(struct net2280 *dev)
2352 {
2353
2354         if (dev->bug7734_patched)
2355                 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2356                        BIT(SET_EP_HIDE_STATUS_PHASE),
2357                        &dev->epregs[0].ep_rsp);
2358
2359         /*
2360          * hardware optionally handles a bunch of standard requests
2361          * that the API hides from drivers anyway.  have it do so.
2362          * endpoint status/features are handled in software, to
2363          * help pass tests for some dubious behavior.
2364          */
2365         writel(BIT(SET_ISOCHRONOUS_DELAY) |
2366                BIT(SET_SEL) |
2367                BIT(SET_TEST_MODE) |
2368                BIT(SET_ADDRESS) |
2369                BIT(GET_INTERFACE_STATUS) |
2370                BIT(GET_DEVICE_STATUS),
2371                 &dev->usb->stdrsp);
2372         dev->wakeup_enable = 1;
2373         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2374                (dev->softconnect << USB_DETECT_ENABLE) |
2375                BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2376                &dev->usb->usbctl);
2377
2378         /* enable irqs so we can see ep0 and general operation  */
2379         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2380                BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2381                &dev->regs->pciirqenb0);
2382         writel(BIT(PCI_INTERRUPT_ENABLE) |
2383                BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2384                BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2385                BIT(VBUS_INTERRUPT_ENABLE),
2386                &dev->regs->pciirqenb1);
2387
2388         /* don't leave any writes posted */
2389         (void)readl(&dev->usb->usbctl);
2390 }
2391
2392 static void ep0_start(struct net2280 *dev)
2393 {
2394         if (dev->quirks & PLX_LEGACY)
2395                 return ep0_start_228x(dev);
2396         return ep0_start_338x(dev);
2397 }
2398
2399 /* when a driver is successfully registered, it will receive
2400  * control requests including set_configuration(), which enables
2401  * non-control requests.  then usb traffic follows until a
2402  * disconnect is reported.  then a host may connect again, or
2403  * the driver might get unbound.
2404  */
2405 static int net2280_start(struct usb_gadget *_gadget,
2406                 struct usb_gadget_driver *driver)
2407 {
2408         struct net2280          *dev;
2409         int                     retval;
2410         unsigned                i;
2411
2412         /* insist on high speed support from the driver, since
2413          * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2414          * "must not be used in normal operation"
2415          */
2416         if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2417                         !driver->setup)
2418                 return -EINVAL;
2419
2420         dev = container_of(_gadget, struct net2280, gadget);
2421
2422         for (i = 0; i < dev->n_ep; i++)
2423                 dev->ep[i].irqs = 0;
2424
2425         /* hook up the driver ... */
2426         dev->driver = driver;
2427
2428         retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2429         if (retval)
2430                 goto err_unbind;
2431         retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2432         if (retval)
2433                 goto err_func;
2434
2435         /* enable host detection and ep0; and we're ready
2436          * for set_configuration as well as eventual disconnect.
2437          */
2438         net2280_led_active(dev, 1);
2439
2440         if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
2441                 defect7374_enable_data_eps_zero(dev);
2442
2443         ep0_start(dev);
2444
2445         /* pci writes may still be posted */
2446         return 0;
2447
2448 err_func:
2449         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2450 err_unbind:
2451         dev->driver = NULL;
2452         return retval;
2453 }
2454
2455 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2456 {
2457         int                     i;
2458
2459         /* don't disconnect if it's not connected */
2460         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2461                 driver = NULL;
2462
2463         /* stop hardware; prevent new request submissions;
2464          * and kill any outstanding requests.
2465          */
2466         usb_reset(dev);
2467         for (i = 0; i < dev->n_ep; i++)
2468                 nuke(&dev->ep[i]);
2469
2470         /* report disconnect; the driver is already quiesced */
2471         if (dev->async_callbacks && driver) {
2472                 spin_unlock(&dev->lock);
2473                 driver->disconnect(&dev->gadget);
2474                 spin_lock(&dev->lock);
2475         }
2476
2477         usb_reinit(dev);
2478 }
2479
2480 static int net2280_stop(struct usb_gadget *_gadget)
2481 {
2482         struct net2280  *dev;
2483         unsigned long   flags;
2484
2485         dev = container_of(_gadget, struct net2280, gadget);
2486
2487         spin_lock_irqsave(&dev->lock, flags);
2488         stop_activity(dev, NULL);
2489         spin_unlock_irqrestore(&dev->lock, flags);
2490
2491         net2280_led_active(dev, 0);
2492
2493         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2494         device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2495
2496         dev->driver = NULL;
2497
2498         return 0;
2499 }
2500
2501 static void net2280_async_callbacks(struct usb_gadget *_gadget, bool enable)
2502 {
2503         struct net2280  *dev = container_of(_gadget, struct net2280, gadget);
2504
2505         spin_lock_irq(&dev->lock);
2506         dev->async_callbacks = enable;
2507         spin_unlock_irq(&dev->lock);
2508 }
2509
2510 /*-------------------------------------------------------------------------*/
2511
2512 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2513  * also works for dma-capable endpoints, in pio mode or just
2514  * to manually advance the queue after short OUT transfers.
2515  */
2516 static void handle_ep_small(struct net2280_ep *ep)
2517 {
2518         struct net2280_request  *req;
2519         u32                     t;
2520         /* 0 error, 1 mid-data, 2 done */
2521         int                     mode = 1;
2522
2523         if (!list_empty(&ep->queue))
2524                 req = list_entry(ep->queue.next,
2525                         struct net2280_request, queue);
2526         else
2527                 req = NULL;
2528
2529         /* ack all, and handle what we care about */
2530         t = readl(&ep->regs->ep_stat);
2531         ep->irqs++;
2532
2533         ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2534                         ep->ep.name, t, req ? &req->req : NULL);
2535
2536         if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2537                 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2538         else
2539                 /* Added for 2282 */
2540                 writel(t, &ep->regs->ep_stat);
2541
2542         /* for ep0, monitor token irqs to catch data stage length errors
2543          * and to synchronize on status.
2544          *
2545          * also, to defer reporting of protocol stalls ... here's where
2546          * data or status first appears, handling stalls here should never
2547          * cause trouble on the host side..
2548          *
2549          * control requests could be slightly faster without token synch for
2550          * status, but status can jam up that way.
2551          */
2552         if (unlikely(ep->num == 0)) {
2553                 if (ep->is_in) {
2554                         /* status; stop NAKing */
2555                         if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2556                                 if (ep->dev->protocol_stall) {
2557                                         ep->stopped = 1;
2558                                         set_halt(ep);
2559                                 }
2560                                 if (!req)
2561                                         allow_status(ep);
2562                                 mode = 2;
2563                         /* reply to extra IN data tokens with a zlp */
2564                         } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2565                                 if (ep->dev->protocol_stall) {
2566                                         ep->stopped = 1;
2567                                         set_halt(ep);
2568                                         mode = 2;
2569                                 } else if (ep->responded &&
2570                                                 !req && !ep->stopped)
2571                                         write_fifo(ep, NULL);
2572                         }
2573                 } else {
2574                         /* status; stop NAKing */
2575                         if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2576                                 if (ep->dev->protocol_stall) {
2577                                         ep->stopped = 1;
2578                                         set_halt(ep);
2579                                 }
2580                                 mode = 2;
2581                         /* an extra OUT token is an error */
2582                         } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2583                                         req &&
2584                                         req->req.actual == req->req.length) ||
2585                                         (ep->responded && !req)) {
2586                                 ep->dev->protocol_stall = 1;
2587                                 set_halt(ep);
2588                                 ep->stopped = 1;
2589                                 if (req)
2590                                         done(ep, req, -EOVERFLOW);
2591                                 req = NULL;
2592                         }
2593                 }
2594         }
2595
2596         if (unlikely(!req))
2597                 return;
2598
2599         /* manual DMA queue advance after short OUT */
2600         if (likely(ep->dma)) {
2601                 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2602                         struct net2280_request *stuck_req = NULL;
2603                         int     stopped = ep->stopped;
2604                         int     num_completed;
2605                         int     stuck = 0;
2606                         u32     count;
2607
2608                         /* TRANSFERRED works around OUT_DONE erratum 0112.
2609                          * we expect (N <= maxpacket) bytes; host wrote M.
2610                          * iff (M < N) we won't ever see a DMA interrupt.
2611                          */
2612                         ep->stopped = 1;
2613                         for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2614
2615                                 /* any preceding dma transfers must finish.
2616                                  * dma handles (M >= N), may empty the queue
2617                                  */
2618                                 num_completed = scan_dma_completions(ep);
2619                                 if (unlikely(list_empty(&ep->queue) ||
2620                                                 ep->out_overflow)) {
2621                                         req = NULL;
2622                                         break;
2623                                 }
2624                                 req = list_entry(ep->queue.next,
2625                                         struct net2280_request, queue);
2626
2627                                 /* here either (M < N), a "real" short rx;
2628                                  * or (M == N) and the queue didn't empty
2629                                  */
2630                                 if (likely(t & BIT(FIFO_EMPTY))) {
2631                                         count = readl(&ep->dma->dmacount);
2632                                         count &= DMA_BYTE_COUNT_MASK;
2633                                         if (readl(&ep->dma->dmadesc)
2634                                                         != req->td_dma)
2635                                                 req = NULL;
2636                                         break;
2637                                 }
2638
2639                                 /* Escape loop if no dma transfers completed
2640                                  * after few retries.
2641                                  */
2642                                 if (num_completed == 0) {
2643                                         if (stuck_req == req &&
2644                                             readl(&ep->dma->dmadesc) !=
2645                                                   req->td_dma && stuck++ > 5) {
2646                                                 count = readl(
2647                                                         &ep->dma->dmacount);
2648                                                 count &= DMA_BYTE_COUNT_MASK;
2649                                                 req = NULL;
2650                                                 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n",
2651                                                         ep->ep.name, stuck,
2652                                                         count);
2653                                                 break;
2654                                         } else if (stuck_req != req) {
2655                                                 stuck_req = req;
2656                                                 stuck = 0;
2657                                         }
2658                                 } else {
2659                                         stuck_req = NULL;
2660                                         stuck = 0;
2661                                 }
2662
2663                                 udelay(1);
2664                         }
2665
2666                         /* stop DMA, leave ep NAKing */
2667                         writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2668                         spin_stop_dma(ep->dma);
2669
2670                         if (likely(req)) {
2671                                 req->td->dmacount = 0;
2672                                 t = readl(&ep->regs->ep_avail);
2673                                 dma_done(ep, req, count,
2674                                         (ep->out_overflow || t)
2675                                                 ? -EOVERFLOW : 0);
2676                         }
2677
2678                         /* also flush to prevent erratum 0106 trouble */
2679                         if (unlikely(ep->out_overflow ||
2680                                         (ep->dev->chiprev == 0x0100 &&
2681                                         ep->dev->gadget.speed
2682                                         == USB_SPEED_FULL))) {
2683                                 out_flush(ep);
2684                                 ep->out_overflow = 0;
2685                         }
2686
2687                         /* (re)start dma if needed, stop NAKing */
2688                         ep->stopped = stopped;
2689                         if (!list_empty(&ep->queue))
2690                                 restart_dma(ep);
2691                 } else
2692                         ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2693                                         ep->ep.name, t);
2694                 return;
2695
2696         /* data packet(s) received (in the fifo, OUT) */
2697         } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2698                 if (read_fifo(ep, req) && ep->num != 0)
2699                         mode = 2;
2700
2701         /* data packet(s) transmitted (IN) */
2702         } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2703                 unsigned        len;
2704
2705                 len = req->req.length - req->req.actual;
2706                 if (len > ep->ep.maxpacket)
2707                         len = ep->ep.maxpacket;
2708                 req->req.actual += len;
2709
2710                 /* if we wrote it all, we're usually done */
2711                 /* send zlps until the status stage */
2712                 if ((req->req.actual == req->req.length) &&
2713                         (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2714                                 mode = 2;
2715
2716         /* there was nothing to do ...  */
2717         } else if (mode == 1)
2718                 return;
2719
2720         /* done */
2721         if (mode == 2) {
2722                 /* stream endpoints often resubmit/unlink in completion */
2723                 done(ep, req, 0);
2724
2725                 /* maybe advance queue to next request */
2726                 if (ep->num == 0) {
2727                         /* NOTE:  net2280 could let gadget driver start the
2728                          * status stage later. since not all controllers let
2729                          * them control that, the api doesn't (yet) allow it.
2730                          */
2731                         if (!ep->stopped)
2732                                 allow_status(ep);
2733                         req = NULL;
2734                 } else {
2735                         if (!list_empty(&ep->queue) && !ep->stopped)
2736                                 req = list_entry(ep->queue.next,
2737                                         struct net2280_request, queue);
2738                         else
2739                                 req = NULL;
2740                         if (req && !ep->is_in)
2741                                 stop_out_naking(ep);
2742                 }
2743         }
2744
2745         /* is there a buffer for the next packet?
2746          * for best streaming performance, make sure there is one.
2747          */
2748         if (req && !ep->stopped) {
2749
2750                 /* load IN fifo with next packet (may be zlp) */
2751                 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2752                         write_fifo(ep, &req->req);
2753         }
2754 }
2755
2756 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2757 {
2758         struct net2280_ep       *ep;
2759
2760         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2761                 return &dev->ep[0];
2762         list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2763                 u8      bEndpointAddress;
2764
2765                 if (!ep->desc)
2766                         continue;
2767                 bEndpointAddress = ep->desc->bEndpointAddress;
2768                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2769                         continue;
2770                 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2771                         return ep;
2772         }
2773         return NULL;
2774 }
2775
2776 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2777 {
2778         u32 scratch, fsmvalue;
2779         u32 ack_wait_timeout, state;
2780
2781         /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2782         scratch = get_idx_reg(dev->regs, SCRATCH);
2783         fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2784         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2785
2786         if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2787                                 (r.bRequestType & USB_DIR_IN)))
2788                 return;
2789
2790         /* This is the first Control Read for this connection: */
2791         if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2792                 /*
2793                  * Connection is NOT SS:
2794                  * - Connection must be FS or HS.
2795                  * - This FSM state should allow workaround software to
2796                  * run after the next USB connection.
2797                  */
2798                 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2799                 dev->bug7734_patched = 1;
2800                 goto restore_data_eps;
2801         }
2802
2803         /* Connection is SS: */
2804         for (ack_wait_timeout = 0;
2805                         ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2806                         ack_wait_timeout++) {
2807
2808                 state = readl(&dev->plregs->pl_ep_status_1)
2809                         & (0xff << STATE);
2810                 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2811                         (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2812                         scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2813                         dev->bug7734_patched = 1;
2814                         break;
2815                 }
2816
2817                 /*
2818                  * We have not yet received host's Data Phase ACK
2819                  * - Wait and try again.
2820                  */
2821                 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2822         }
2823
2824
2825         if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2826                 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2827                 "to detect SS host's data phase ACK.");
2828                 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2829                 "got 0x%2.2x.\n", state >> STATE);
2830         } else {
2831                 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2832                 "%duSec for Control Read Data Phase ACK\n",
2833                         DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2834         }
2835
2836 restore_data_eps:
2837         /*
2838          * Restore data EPs to their pre-workaround settings (disabled,
2839          * initialized, and other details).
2840          */
2841         defect7374_disable_data_eps(dev);
2842
2843         set_idx_reg(dev->regs, SCRATCH, scratch);
2844
2845         return;
2846 }
2847
2848 static void ep_clear_seqnum(struct net2280_ep *ep)
2849 {
2850         struct net2280 *dev = ep->dev;
2851         u32 val;
2852         static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2853
2854         val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2855         val |= ep_pl[ep->num];
2856         writel(val, &dev->plregs->pl_ep_ctrl);
2857         val |= BIT(SEQUENCE_NUMBER_RESET);
2858         writel(val, &dev->plregs->pl_ep_ctrl);
2859
2860         return;
2861 }
2862
2863 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2864                 struct net2280_ep *ep, struct usb_ctrlrequest r)
2865 {
2866         struct net2280_ep *e;
2867         u16 status;
2868         int tmp = 0;
2869
2870 #define w_value         le16_to_cpu(r.wValue)
2871 #define w_index         le16_to_cpu(r.wIndex)
2872 #define w_length        le16_to_cpu(r.wLength)
2873
2874         switch (r.bRequest) {
2875         case USB_REQ_SET_CONFIGURATION:
2876                 dev->addressed_state = !w_value;
2877                 goto usb3_delegate;
2878
2879         case USB_REQ_GET_STATUS:
2880                 switch (r.bRequestType) {
2881                 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2882                         status = dev->wakeup_enable ? 0x02 : 0x00;
2883                         if (dev->gadget.is_selfpowered)
2884                                 status |= BIT(0);
2885                         status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2886                                                         dev->ltm_enable << 4);
2887                         writel(0, &dev->epregs[0].ep_irqenb);
2888                         set_fifo_bytecount(ep, sizeof(status));
2889                         writel((__force u32) status, &dev->epregs[0].ep_data);
2890                         allow_status_338x(ep);
2891                         break;
2892
2893                 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2894                         e = get_ep_by_addr(dev, w_index);
2895                         if (!e)
2896                                 goto do_stall3;
2897                         status = readl(&e->regs->ep_rsp) &
2898                                                 BIT(CLEAR_ENDPOINT_HALT);
2899                         writel(0, &dev->epregs[0].ep_irqenb);
2900                         set_fifo_bytecount(ep, sizeof(status));
2901                         writel((__force u32) status, &dev->epregs[0].ep_data);
2902                         allow_status_338x(ep);
2903                         break;
2904
2905                 default:
2906                         goto usb3_delegate;
2907                 }
2908                 break;
2909
2910         case USB_REQ_CLEAR_FEATURE:
2911                 switch (r.bRequestType) {
2912                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2913                         if (!dev->addressed_state) {
2914                                 switch (w_value) {
2915                                 case USB_DEVICE_U1_ENABLE:
2916                                         dev->u1_enable = 0;
2917                                         writel(readl(&dev->usb_ext->usbctl2) &
2918                                                 ~BIT(U1_ENABLE),
2919                                                 &dev->usb_ext->usbctl2);
2920                                         allow_status_338x(ep);
2921                                         goto next_endpoints3;
2922
2923                                 case USB_DEVICE_U2_ENABLE:
2924                                         dev->u2_enable = 0;
2925                                         writel(readl(&dev->usb_ext->usbctl2) &
2926                                                 ~BIT(U2_ENABLE),
2927                                                 &dev->usb_ext->usbctl2);
2928                                         allow_status_338x(ep);
2929                                         goto next_endpoints3;
2930
2931                                 case USB_DEVICE_LTM_ENABLE:
2932                                         dev->ltm_enable = 0;
2933                                         writel(readl(&dev->usb_ext->usbctl2) &
2934                                                 ~BIT(LTM_ENABLE),
2935                                                 &dev->usb_ext->usbctl2);
2936                                         allow_status_338x(ep);
2937                                         goto next_endpoints3;
2938
2939                                 default:
2940                                         break;
2941                                 }
2942                         }
2943                         if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2944                                 dev->wakeup_enable = 0;
2945                                 writel(readl(&dev->usb->usbctl) &
2946                                         ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2947                                         &dev->usb->usbctl);
2948                                 allow_status_338x(ep);
2949                                 break;
2950                         }
2951                         goto usb3_delegate;
2952
2953                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2954                         e = get_ep_by_addr(dev, w_index);
2955                         if (!e)
2956                                 goto do_stall3;
2957                         if (w_value != USB_ENDPOINT_HALT)
2958                                 goto do_stall3;
2959                         ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2960                         /*
2961                          * Workaround for SS SeqNum not cleared via
2962                          * Endpoint Halt (Clear) bit. select endpoint
2963                          */
2964                         ep_clear_seqnum(e);
2965                         clear_halt(e);
2966                         if (!list_empty(&e->queue) && e->td_dma)
2967                                 restart_dma(e);
2968                         allow_status(ep);
2969                         ep->stopped = 1;
2970                         break;
2971
2972                 default:
2973                         goto usb3_delegate;
2974                 }
2975                 break;
2976         case USB_REQ_SET_FEATURE:
2977                 switch (r.bRequestType) {
2978                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2979                         if (!dev->addressed_state) {
2980                                 switch (w_value) {
2981                                 case USB_DEVICE_U1_ENABLE:
2982                                         dev->u1_enable = 1;
2983                                         writel(readl(&dev->usb_ext->usbctl2) |
2984                                                 BIT(U1_ENABLE),
2985                                                 &dev->usb_ext->usbctl2);
2986                                         allow_status_338x(ep);
2987                                         goto next_endpoints3;
2988
2989                                 case USB_DEVICE_U2_ENABLE:
2990                                         dev->u2_enable = 1;
2991                                         writel(readl(&dev->usb_ext->usbctl2) |
2992                                                 BIT(U2_ENABLE),
2993                                                 &dev->usb_ext->usbctl2);
2994                                         allow_status_338x(ep);
2995                                         goto next_endpoints3;
2996
2997                                 case USB_DEVICE_LTM_ENABLE:
2998                                         dev->ltm_enable = 1;
2999                                         writel(readl(&dev->usb_ext->usbctl2) |
3000                                                 BIT(LTM_ENABLE),
3001                                                 &dev->usb_ext->usbctl2);
3002                                         allow_status_338x(ep);
3003                                         goto next_endpoints3;
3004                                 default:
3005                                         break;
3006                                 }
3007                         }
3008
3009                         if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
3010                                 dev->wakeup_enable = 1;
3011                                 writel(readl(&dev->usb->usbctl) |
3012                                         BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
3013                                         &dev->usb->usbctl);
3014                                 allow_status_338x(ep);
3015                                 break;
3016                         }
3017                         goto usb3_delegate;
3018
3019                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
3020                         e = get_ep_by_addr(dev, w_index);
3021                         if (!e || (w_value != USB_ENDPOINT_HALT))
3022                                 goto do_stall3;
3023                         ep->stopped = 1;
3024                         if (ep->num == 0)
3025                                 ep->dev->protocol_stall = 1;
3026                         else {
3027                                 if (ep->dma)
3028                                         abort_dma(ep);
3029                                 set_halt(ep);
3030                         }
3031                         allow_status_338x(ep);
3032                         break;
3033
3034                 default:
3035                         goto usb3_delegate;
3036                 }
3037
3038                 break;
3039         default:
3040
3041 usb3_delegate:
3042                 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
3043                                 r.bRequestType, r.bRequest,
3044                                 w_value, w_index, w_length,
3045                                 readl(&ep->cfg->ep_cfg));
3046
3047                 ep->responded = 0;
3048                 if (dev->async_callbacks) {
3049                         spin_unlock(&dev->lock);
3050                         tmp = dev->driver->setup(&dev->gadget, &r);
3051                         spin_lock(&dev->lock);
3052                 }
3053         }
3054 do_stall3:
3055         if (tmp < 0) {
3056                 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3057                                 r.bRequestType, r.bRequest, tmp);
3058                 dev->protocol_stall = 1;
3059                 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
3060                 set_halt(ep);
3061         }
3062
3063 next_endpoints3:
3064
3065 #undef  w_value
3066 #undef  w_index
3067 #undef  w_length
3068
3069         return;
3070 }
3071
3072 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
3073 {
3074         u32 index;
3075         u32 bit;
3076
3077         for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
3078                 bit = BIT(ep_bit[index]);
3079
3080                 if (!stat0)
3081                         break;
3082
3083                 if (!(stat0 & bit))
3084                         continue;
3085
3086                 stat0 &= ~bit;
3087
3088                 handle_ep_small(&dev->ep[index]);
3089         }
3090 }
3091
3092 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
3093 {
3094         struct net2280_ep       *ep;
3095         u32                     num, scratch;
3096
3097         /* most of these don't need individual acks */
3098         stat &= ~BIT(INTA_ASSERTED);
3099         if (!stat)
3100                 return;
3101         /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
3102
3103         /* starting a control request? */
3104         if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
3105                 union {
3106                         u32                     raw[2];
3107                         struct usb_ctrlrequest  r;
3108                 } u;
3109                 int                             tmp;
3110                 struct net2280_request          *req;
3111
3112                 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
3113                         u32 val = readl(&dev->usb->usbstat);
3114                         if (val & BIT(SUPER_SPEED)) {
3115                                 dev->gadget.speed = USB_SPEED_SUPER;
3116                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3117                                                 EP0_SS_MAX_PACKET_SIZE);
3118                         } else if (val & BIT(HIGH_SPEED)) {
3119                                 dev->gadget.speed = USB_SPEED_HIGH;
3120                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3121                                                 EP0_HS_MAX_PACKET_SIZE);
3122                         } else {
3123                                 dev->gadget.speed = USB_SPEED_FULL;
3124                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3125                                                 EP0_HS_MAX_PACKET_SIZE);
3126                         }
3127                         net2280_led_speed(dev, dev->gadget.speed);
3128                         ep_dbg(dev, "%s\n",
3129                                         usb_speed_string(dev->gadget.speed));
3130                 }
3131
3132                 ep = &dev->ep[0];
3133                 ep->irqs++;
3134
3135                 /* make sure any leftover request state is cleared */
3136                 stat &= ~BIT(ENDPOINT_0_INTERRUPT);
3137                 while (!list_empty(&ep->queue)) {
3138                         req = list_entry(ep->queue.next,
3139                                         struct net2280_request, queue);
3140                         done(ep, req, (req->req.actual == req->req.length)
3141                                                 ? 0 : -EPROTO);
3142                 }
3143                 ep->stopped = 0;
3144                 dev->protocol_stall = 0;
3145                 if (!(dev->quirks & PLX_PCIE)) {
3146                         if (ep->dev->quirks & PLX_2280)
3147                                 tmp = BIT(FIFO_OVERFLOW) |
3148                                     BIT(FIFO_UNDERFLOW);
3149                         else
3150                                 tmp = 0;
3151
3152                         writel(tmp | BIT(TIMEOUT) |
3153                                    BIT(USB_STALL_SENT) |
3154                                    BIT(USB_IN_NAK_SENT) |
3155                                    BIT(USB_IN_ACK_RCVD) |
3156                                    BIT(USB_OUT_PING_NAK_SENT) |
3157                                    BIT(USB_OUT_ACK_SENT) |
3158                                    BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3159                                    BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3160                                    BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3161                                    BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3162                                    BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3163                                    BIT(DATA_IN_TOKEN_INTERRUPT),
3164                                    &ep->regs->ep_stat);
3165                 }
3166                 u.raw[0] = readl(&dev->usb->setup0123);
3167                 u.raw[1] = readl(&dev->usb->setup4567);
3168
3169                 cpu_to_le32s(&u.raw[0]);
3170                 cpu_to_le32s(&u.raw[1]);
3171
3172                 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
3173                         defect7374_workaround(dev, u.r);
3174
3175                 tmp = 0;
3176
3177 #define w_value         le16_to_cpu(u.r.wValue)
3178 #define w_index         le16_to_cpu(u.r.wIndex)
3179 #define w_length        le16_to_cpu(u.r.wLength)
3180
3181                 /* ack the irq */
3182                 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3183                 stat ^= BIT(SETUP_PACKET_INTERRUPT);
3184
3185                 /* watch control traffic at the token level, and force
3186                  * synchronization before letting the status stage happen.
3187                  * FIXME ignore tokens we'll NAK, until driver responds.
3188                  * that'll mean a lot less irqs for some drivers.
3189                  */
3190                 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3191                 if (ep->is_in) {
3192                         scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3193                                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3194                                 BIT(DATA_IN_TOKEN_INTERRUPT);
3195                         stop_out_naking(ep);
3196                 } else
3197                         scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3198                                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3199                                 BIT(DATA_IN_TOKEN_INTERRUPT);
3200                 writel(scratch, &dev->epregs[0].ep_irqenb);
3201
3202                 /* we made the hardware handle most lowlevel requests;
3203                  * everything else goes uplevel to the gadget code.
3204                  */
3205                 ep->responded = 1;
3206
3207                 if (dev->gadget.speed == USB_SPEED_SUPER) {
3208                         handle_stat0_irqs_superspeed(dev, ep, u.r);
3209                         goto next_endpoints;
3210                 }
3211
3212                 switch (u.r.bRequest) {
3213                 case USB_REQ_GET_STATUS: {
3214                         struct net2280_ep       *e;
3215                         __le32                  status;
3216
3217                         /* hw handles device and interface status */
3218                         if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3219                                 goto delegate;
3220                         e = get_ep_by_addr(dev, w_index);
3221                         if (!e || w_length > 2)
3222                                 goto do_stall;
3223
3224                         if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3225                                 status = cpu_to_le32(1);
3226                         else
3227                                 status = cpu_to_le32(0);
3228
3229                         /* don't bother with a request object! */
3230                         writel(0, &dev->epregs[0].ep_irqenb);
3231                         set_fifo_bytecount(ep, w_length);
3232                         writel((__force u32)status, &dev->epregs[0].ep_data);
3233                         allow_status(ep);
3234                         ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3235                         goto next_endpoints;
3236                         }
3237                         break;
3238                 case USB_REQ_CLEAR_FEATURE: {
3239                         struct net2280_ep       *e;
3240
3241                         /* hw handles device features */
3242                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3243                                 goto delegate;
3244                         if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3245                                 goto do_stall;
3246                         e = get_ep_by_addr(dev, w_index);
3247                         if (!e)
3248                                 goto do_stall;
3249                         if (e->wedged) {
3250                                 ep_vdbg(dev, "%s wedged, halt not cleared\n",
3251                                                 ep->ep.name);
3252                         } else {
3253                                 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3254                                 clear_halt(e);
3255                                 if ((ep->dev->quirks & PLX_PCIE) &&
3256                                         !list_empty(&e->queue) && e->td_dma)
3257                                                 restart_dma(e);
3258                         }
3259                         allow_status(ep);
3260                         goto next_endpoints;
3261                         }
3262                         break;
3263                 case USB_REQ_SET_FEATURE: {
3264                         struct net2280_ep       *e;
3265
3266                         /* hw handles device features */
3267                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3268                                 goto delegate;
3269                         if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3270                                 goto do_stall;
3271                         e = get_ep_by_addr(dev, w_index);
3272                         if (!e)
3273                                 goto do_stall;
3274                         if (e->ep.name == ep0name)
3275                                 goto do_stall;
3276                         set_halt(e);
3277                         if ((dev->quirks & PLX_PCIE) && e->dma)
3278                                 abort_dma(e);
3279                         allow_status(ep);
3280                         ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3281                         goto next_endpoints;
3282                         }
3283                         break;
3284                 default:
3285 delegate:
3286                         ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3287                                 "ep_cfg %08x\n",
3288                                 u.r.bRequestType, u.r.bRequest,
3289                                 w_value, w_index, w_length,
3290                                 readl(&ep->cfg->ep_cfg));
3291                         ep->responded = 0;
3292                         if (dev->async_callbacks) {
3293                                 spin_unlock(&dev->lock);
3294                                 tmp = dev->driver->setup(&dev->gadget, &u.r);
3295                                 spin_lock(&dev->lock);
3296                         }
3297                 }
3298
3299                 /* stall ep0 on error */
3300                 if (tmp < 0) {
3301 do_stall:
3302                         ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3303                                         u.r.bRequestType, u.r.bRequest, tmp);
3304                         dev->protocol_stall = 1;
3305                 }
3306
3307                 /* some in/out token irq should follow; maybe stall then.
3308                  * driver must queue a request (even zlp) or halt ep0
3309                  * before the host times out.
3310                  */
3311         }
3312
3313 #undef  w_value
3314 #undef  w_index
3315 #undef  w_length
3316
3317 next_endpoints:
3318         if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
3319                 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3320                         USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3321                         USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3322
3323                 if (stat & mask) {
3324                         usb338x_handle_ep_intr(dev, stat & mask);
3325                         stat &= ~mask;
3326                 }
3327         } else {
3328                 /* endpoint data irq ? */
3329                 scratch = stat & 0x7f;
3330                 stat &= ~0x7f;
3331                 for (num = 0; scratch; num++) {
3332                         u32             t;
3333
3334                         /* do this endpoint's FIFO and queue need tending? */
3335                         t = BIT(num);
3336                         if ((scratch & t) == 0)
3337                                 continue;
3338                         scratch ^= t;
3339
3340                         ep = &dev->ep[num];
3341                         handle_ep_small(ep);
3342                 }
3343         }
3344
3345         if (stat)
3346                 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3347 }
3348
3349 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3350                 BIT(DMA_C_INTERRUPT) | \
3351                 BIT(DMA_B_INTERRUPT) | \
3352                 BIT(DMA_A_INTERRUPT))
3353 #define PCI_ERROR_INTERRUPTS ( \
3354                 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3355                 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3356                 BIT(PCI_RETRY_ABORT_INTERRUPT))
3357
3358 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3359 __releases(dev->lock)
3360 __acquires(dev->lock)
3361 {
3362         struct net2280_ep       *ep;
3363         u32                     tmp, num, mask, scratch;
3364
3365         /* after disconnect there's nothing else to do! */
3366         tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3367         mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3368
3369         /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3370          * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3371          * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3372          * only indicates a change in the reset state).
3373          */
3374         if (stat & tmp) {
3375                 bool    reset = false;
3376                 bool    disconnect = false;
3377
3378                 /*
3379                  * Ignore disconnects and resets if the speed hasn't been set.
3380                  * VBUS can bounce and there's always an initial reset.
3381                  */
3382                 writel(tmp, &dev->regs->irqstat1);
3383                 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3384                         if ((stat & BIT(VBUS_INTERRUPT)) &&
3385                                         (readl(&dev->usb->usbctl) &
3386                                                 BIT(VBUS_PIN)) == 0) {
3387                                 disconnect = true;
3388                                 ep_dbg(dev, "disconnect %s\n",
3389                                                 dev->driver->driver.name);
3390                         } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3391                                         (readl(&dev->usb->usbstat) & mask)
3392                                                 == 0) {
3393                                 reset = true;
3394                                 ep_dbg(dev, "reset %s\n",
3395                                                 dev->driver->driver.name);
3396                         }
3397
3398                         if (disconnect || reset) {
3399                                 stop_activity(dev, dev->driver);
3400                                 ep0_start(dev);
3401                                 if (dev->async_callbacks) {
3402                                         spin_unlock(&dev->lock);
3403                                         if (reset)
3404                                                 usb_gadget_udc_reset(&dev->gadget, dev->driver);
3405                                         else
3406                                                 (dev->driver->disconnect)(&dev->gadget);
3407                                         spin_lock(&dev->lock);
3408                                 }
3409                                 return;
3410                         }
3411                 }
3412                 stat &= ~tmp;
3413
3414                 /* vBUS can bounce ... one of many reasons to ignore the
3415                  * notion of hotplug events on bus connect/disconnect!
3416                  */
3417                 if (!stat)
3418                         return;
3419         }
3420
3421         /* NOTE: chip stays in PCI D0 state for now, but it could
3422          * enter D1 to save more power
3423          */
3424         tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3425         if (stat & tmp) {
3426                 writel(tmp, &dev->regs->irqstat1);
3427                 spin_unlock(&dev->lock);
3428                 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3429                         if (dev->async_callbacks && dev->driver->suspend)
3430                                 dev->driver->suspend(&dev->gadget);
3431                         if (!enable_suspend)
3432                                 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3433                 } else {
3434                         if (dev->async_callbacks && dev->driver->resume)
3435                                 dev->driver->resume(&dev->gadget);
3436                         /* at high speed, note erratum 0133 */
3437                 }
3438                 spin_lock(&dev->lock);
3439                 stat &= ~tmp;
3440         }
3441
3442         /* clear any other status/irqs */
3443         if (stat)
3444                 writel(stat, &dev->regs->irqstat1);
3445
3446         /* some status we can just ignore */
3447         if (dev->quirks & PLX_2280)
3448                 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3449                           BIT(SUSPEND_REQUEST_INTERRUPT) |
3450                           BIT(RESUME_INTERRUPT) |
3451                           BIT(SOF_INTERRUPT));
3452         else
3453                 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3454                           BIT(RESUME_INTERRUPT) |
3455                           BIT(SOF_DOWN_INTERRUPT) |
3456                           BIT(SOF_INTERRUPT));
3457
3458         if (!stat)
3459                 return;
3460         /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3461
3462         /* DMA status, for ep-{a,b,c,d} */
3463         scratch = stat & DMA_INTERRUPTS;
3464         stat &= ~DMA_INTERRUPTS;
3465         scratch >>= 9;
3466         for (num = 0; scratch; num++) {
3467                 struct net2280_dma_regs __iomem *dma;
3468
3469                 tmp = BIT(num);
3470                 if ((tmp & scratch) == 0)
3471                         continue;
3472                 scratch ^= tmp;
3473
3474                 ep = &dev->ep[num + 1];
3475                 dma = ep->dma;
3476
3477                 if (!dma)
3478                         continue;
3479
3480                 /* clear ep's dma status */
3481                 tmp = readl(&dma->dmastat);
3482                 writel(tmp, &dma->dmastat);
3483
3484                 /* dma sync*/
3485                 if (dev->quirks & PLX_PCIE) {
3486                         u32 r_dmacount = readl(&dma->dmacount);
3487                         if (!ep->is_in &&  (r_dmacount & 0x00FFFFFF) &&
3488                             (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3489                                 continue;
3490                 }
3491
3492                 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3493                         ep_dbg(ep->dev, "%s no xact done? %08x\n",
3494                                 ep->ep.name, tmp);
3495                         continue;
3496                 }
3497                 stop_dma(ep->dma);
3498
3499                 /* OUT transfers terminate when the data from the
3500                  * host is in our memory.  Process whatever's done.
3501                  * On this path, we know transfer's last packet wasn't
3502                  * less than req->length. NAK_OUT_PACKETS may be set,
3503                  * or the FIFO may already be holding new packets.
3504                  *
3505                  * IN transfers can linger in the FIFO for a very
3506                  * long time ... we ignore that for now, accounting
3507                  * precisely (like PIO does) needs per-packet irqs
3508                  */
3509                 scan_dma_completions(ep);
3510
3511                 /* disable dma on inactive queues; else maybe restart */
3512                 if (!list_empty(&ep->queue)) {
3513                         tmp = readl(&dma->dmactl);
3514                         restart_dma(ep);
3515                 }
3516                 ep->irqs++;
3517         }
3518
3519         /* NOTE:  there are other PCI errors we might usefully notice.
3520          * if they appear very often, here's where to try recovering.
3521          */
3522         if (stat & PCI_ERROR_INTERRUPTS) {
3523                 ep_err(dev, "pci dma error; stat %08x\n", stat);
3524                 stat &= ~PCI_ERROR_INTERRUPTS;
3525                 /* these are fatal errors, but "maybe" they won't
3526                  * happen again ...
3527                  */
3528                 stop_activity(dev, dev->driver);
3529                 ep0_start(dev);
3530                 stat = 0;
3531         }
3532
3533         if (stat)
3534                 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3535 }
3536
3537 static irqreturn_t net2280_irq(int irq, void *_dev)
3538 {
3539         struct net2280          *dev = _dev;
3540
3541         /* shared interrupt, not ours */
3542         if ((dev->quirks & PLX_LEGACY) &&
3543                 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3544                 return IRQ_NONE;
3545
3546         spin_lock(&dev->lock);
3547
3548         /* handle disconnect, dma, and more */
3549         handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3550
3551         /* control requests and PIO */
3552         handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3553
3554         if (dev->quirks & PLX_PCIE) {
3555                 /* re-enable interrupt to trigger any possible new interrupt */
3556                 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3557                 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3558                 writel(pciirqenb1, &dev->regs->pciirqenb1);
3559         }
3560
3561         spin_unlock(&dev->lock);
3562
3563         return IRQ_HANDLED;
3564 }
3565
3566 /*-------------------------------------------------------------------------*/
3567
3568 static void gadget_release(struct device *_dev)
3569 {
3570         struct net2280  *dev = container_of(_dev, struct net2280, gadget.dev);
3571
3572         kfree(dev);
3573 }
3574
3575 /* tear down the binding between this driver and the pci device */
3576
3577 static void net2280_remove(struct pci_dev *pdev)
3578 {
3579         struct net2280          *dev = pci_get_drvdata(pdev);
3580
3581         if (dev->added)
3582                 usb_del_gadget(&dev->gadget);
3583
3584         BUG_ON(dev->driver);
3585
3586         /* then clean up the resources we allocated during probe() */
3587         if (dev->requests) {
3588                 int             i;
3589                 for (i = 1; i < 5; i++) {
3590                         if (!dev->ep[i].dummy)
3591                                 continue;
3592                         dma_pool_free(dev->requests, dev->ep[i].dummy,
3593                                         dev->ep[i].td_dma);
3594                 }
3595                 dma_pool_destroy(dev->requests);
3596         }
3597         if (dev->got_irq)
3598                 free_irq(pdev->irq, dev);
3599         if (dev->quirks & PLX_PCIE)
3600                 pci_disable_msi(pdev);
3601         if (dev->regs) {
3602                 net2280_led_shutdown(dev);
3603                 iounmap(dev->regs);
3604         }
3605         if (dev->region)
3606                 release_mem_region(pci_resource_start(pdev, 0),
3607                                 pci_resource_len(pdev, 0));
3608         if (dev->enabled)
3609                 pci_disable_device(pdev);
3610         device_remove_file(&pdev->dev, &dev_attr_registers);
3611
3612         ep_info(dev, "unbind\n");
3613         usb_put_gadget(&dev->gadget);
3614 }
3615
3616 /* wrap this driver around the specified device, but
3617  * don't respond over USB until a gadget driver binds to us.
3618  */
3619
3620 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3621 {
3622         struct net2280          *dev;
3623         unsigned long           resource, len;
3624         void                    __iomem *base = NULL;
3625         int                     retval, i;
3626
3627         /* alloc, and start init */
3628         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3629         if (dev == NULL) {
3630                 retval = -ENOMEM;
3631                 goto done;
3632         }
3633
3634         pci_set_drvdata(pdev, dev);
3635         usb_initialize_gadget(&pdev->dev, &dev->gadget, gadget_release);
3636         spin_lock_init(&dev->lock);
3637         dev->quirks = id->driver_data;
3638         dev->pdev = pdev;
3639         dev->gadget.ops = &net2280_ops;
3640         dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3641                                 USB_SPEED_SUPER : USB_SPEED_HIGH;
3642
3643         /* the "gadget" abstracts/virtualizes the controller */
3644         dev->gadget.name = driver_name;
3645
3646         /* now all the pci goodies ... */
3647         if (pci_enable_device(pdev) < 0) {
3648                 retval = -ENODEV;
3649                 goto done;
3650         }
3651         dev->enabled = 1;
3652
3653         /* BAR 0 holds all the registers
3654          * BAR 1 is 8051 memory; unused here (note erratum 0103)
3655          * BAR 2 is fifo memory; unused here
3656          */
3657         resource = pci_resource_start(pdev, 0);
3658         len = pci_resource_len(pdev, 0);
3659         if (!request_mem_region(resource, len, driver_name)) {
3660                 ep_dbg(dev, "controller already in use\n");
3661                 retval = -EBUSY;
3662                 goto done;
3663         }
3664         dev->region = 1;
3665
3666         /* FIXME provide firmware download interface to put
3667          * 8051 code into the chip, e.g. to turn on PCI PM.
3668          */
3669
3670         base = ioremap(resource, len);
3671         if (base == NULL) {
3672                 ep_dbg(dev, "can't map memory\n");
3673                 retval = -EFAULT;
3674                 goto done;
3675         }
3676         dev->regs = (struct net2280_regs __iomem *) base;
3677         dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3678         dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3679         dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3680         dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3681         dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3682
3683         if (dev->quirks & PLX_PCIE) {
3684                 u32 fsmvalue;
3685                 u32 usbstat;
3686                 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3687                                                         (base + 0x00b4);
3688                 dev->llregs = (struct usb338x_ll_regs __iomem *)
3689                                                         (base + 0x0700);
3690                 dev->plregs = (struct usb338x_pl_regs __iomem *)
3691                                                         (base + 0x0800);
3692                 usbstat = readl(&dev->usb->usbstat);
3693                 dev->enhanced_mode = !!(usbstat & BIT(11));
3694                 dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3695                 /* put into initial config, link up all endpoints */
3696                 fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3697                                         (0xf << DEFECT7374_FSM_FIELD);
3698                 /* See if firmware needs to set up for workaround: */
3699                 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3700                         dev->bug7734_patched = 1;
3701                         writel(0, &dev->usb->usbctl);
3702                 } else
3703                         dev->bug7734_patched = 0;
3704         } else {
3705                 dev->enhanced_mode = 0;
3706                 dev->n_ep = 7;
3707                 /* put into initial config, link up all endpoints */
3708                 writel(0, &dev->usb->usbctl);
3709         }
3710
3711         usb_reset(dev);
3712         usb_reinit(dev);
3713
3714         /* irq setup after old hardware is cleaned up */
3715         if (!pdev->irq) {
3716                 ep_err(dev, "No IRQ.  Check PCI setup!\n");
3717                 retval = -ENODEV;
3718                 goto done;
3719         }
3720
3721         if (dev->quirks & PLX_PCIE)
3722                 if (pci_enable_msi(pdev))
3723                         ep_err(dev, "Failed to enable MSI mode\n");
3724
3725         if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3726                                                         driver_name, dev)) {
3727                 ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3728                 retval = -EBUSY;
3729                 goto done;
3730         }
3731         dev->got_irq = 1;
3732
3733         /* DMA setup */
3734         /* NOTE:  we know only the 32 LSBs of dma addresses may be nonzero */
3735         dev->requests = dma_pool_create("requests", &pdev->dev,
3736                 sizeof(struct net2280_dma),
3737                 0 /* no alignment requirements */,
3738                 0 /* or page-crossing issues */);
3739         if (!dev->requests) {
3740                 ep_dbg(dev, "can't get request pool\n");
3741                 retval = -ENOMEM;
3742                 goto done;
3743         }
3744         for (i = 1; i < 5; i++) {
3745                 struct net2280_dma      *td;
3746
3747                 td = dma_pool_alloc(dev->requests, GFP_KERNEL,
3748                                 &dev->ep[i].td_dma);
3749                 if (!td) {
3750                         ep_dbg(dev, "can't get dummy %d\n", i);
3751                         retval = -ENOMEM;
3752                         goto done;
3753                 }
3754                 td->dmacount = 0;       /* not VALID */
3755                 td->dmadesc = td->dmaaddr;
3756                 dev->ep[i].dummy = td;
3757         }
3758
3759         /* enable lower-overhead pci memory bursts during DMA */
3760         if (dev->quirks & PLX_LEGACY)
3761                 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3762                         /*
3763                          * 256 write retries may not be enough...
3764                            BIT(PCI_RETRY_ABORT_ENABLE) |
3765                         */
3766                         BIT(DMA_READ_MULTIPLE_ENABLE) |
3767                         BIT(DMA_READ_LINE_ENABLE),
3768                         &dev->pci->pcimstctl);
3769         /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3770         pci_set_master(pdev);
3771         pci_try_set_mwi(pdev);
3772
3773         /* ... also flushes any posted pci writes */
3774         dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3775
3776         /* done */
3777         ep_info(dev, "%s\n", driver_desc);
3778         ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3779                         pdev->irq, base, dev->chiprev);
3780         ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3781                 dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3782         retval = device_create_file(&pdev->dev, &dev_attr_registers);
3783         if (retval)
3784                 goto done;
3785
3786         retval = usb_add_gadget(&dev->gadget);
3787         if (retval)
3788                 goto done;
3789         dev->added = 1;
3790         return 0;
3791
3792 done:
3793         if (dev) {
3794                 net2280_remove(pdev);
3795                 kfree(dev);
3796         }
3797         return retval;
3798 }
3799
3800 /* make sure the board is quiescent; otherwise it will continue
3801  * generating IRQs across the upcoming reboot.
3802  */
3803
3804 static void net2280_shutdown(struct pci_dev *pdev)
3805 {
3806         struct net2280          *dev = pci_get_drvdata(pdev);
3807
3808         /* disable IRQs */
3809         writel(0, &dev->regs->pciirqenb0);
3810         writel(0, &dev->regs->pciirqenb1);
3811
3812         /* disable the pullup so the host will think we're gone */
3813         writel(0, &dev->usb->usbctl);
3814
3815 }
3816
3817
3818 /*-------------------------------------------------------------------------*/
3819
3820 static const struct pci_device_id pci_ids[] = { {
3821         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3822         .class_mask =   ~0,
3823         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3824         .device =       0x2280,
3825         .subvendor =    PCI_ANY_ID,
3826         .subdevice =    PCI_ANY_ID,
3827         .driver_data =  PLX_LEGACY | PLX_2280,
3828         }, {
3829         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3830         .class_mask =   ~0,
3831         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3832         .device =       0x2282,
3833         .subvendor =    PCI_ANY_ID,
3834         .subdevice =    PCI_ANY_ID,
3835         .driver_data =  PLX_LEGACY,
3836         },
3837         {
3838         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3839         .class_mask =   ~0,
3840         .vendor =       PCI_VENDOR_ID_PLX,
3841         .device =       0x2380,
3842         .subvendor =    PCI_ANY_ID,
3843         .subdevice =    PCI_ANY_ID,
3844         .driver_data =  PLX_PCIE,
3845          },
3846         {
3847         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3848         .class_mask =   ~0,
3849         .vendor =       PCI_VENDOR_ID_PLX,
3850         .device =       0x3380,
3851         .subvendor =    PCI_ANY_ID,
3852         .subdevice =    PCI_ANY_ID,
3853         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3854          },
3855         {
3856         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3857         .class_mask =   ~0,
3858         .vendor =       PCI_VENDOR_ID_PLX,
3859         .device =       0x3382,
3860         .subvendor =    PCI_ANY_ID,
3861         .subdevice =    PCI_ANY_ID,
3862         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3863          },
3864 { /* end: all zeroes */ }
3865 };
3866 MODULE_DEVICE_TABLE(pci, pci_ids);
3867
3868 /* pci driver glue; this is a "new style" PCI driver module */
3869 static struct pci_driver net2280_pci_driver = {
3870         .name =         driver_name,
3871         .id_table =     pci_ids,
3872
3873         .probe =        net2280_probe,
3874         .remove =       net2280_remove,
3875         .shutdown =     net2280_shutdown,
3876
3877         /* FIXME add power management support */
3878 };
3879
3880 module_pci_driver(net2280_pci_driver);
3881
3882 MODULE_DESCRIPTION(DRIVER_DESC);
3883 MODULE_AUTHOR("David Brownell");
3884 MODULE_LICENSE("GPL");