drivers/usb/gadget/udc/net2280.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for the PLX NET2280 USB device controller.
   4  * Specs and errata are available from <http://www.plxtech.com>.
   5  *
   6  * PLX Technology Inc. (formerly NetChip Technology) supported the
   7  * development of this driver.
   8  *
   9  *
  10  * CODE STATUS HIGHLIGHTS
  11  *
  12  * This driver should work well with most "gadget" drivers, including
  13  * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
  14  * as well as Gadget Zero and Gadgetfs.
  15  *
  16  * DMA is enabled by default.
  17  *
  18  * MSI is enabled by default.  The legacy IRQ is used if MSI couldn't
  19  * be enabled.
  20  *
  21  * Note that almost all the errata workarounds here are only needed for
  22  * rev1 chips.  Rev1a silicon (0110) fixes almost all of them.
  23  */
  24
  25 /*
  26  * Copyright (C) 2003 David Brownell
  27  * Copyright (C) 2003-2005 PLX Technology, Inc.
  28  * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
  29  *
  30  * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
  31  *      with 2282 chip
  32  *
  33  * Modified Ricardo Ribalda Qtechnology AS  to provide compatibility
  34  *      with usb 338x chip. Based on PLX driver
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/pci.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/kernel.h>
  41 #include <linux/delay.h>
  42 #include <linux/ioport.h>
  43 #include <linux/slab.h>
  44 #include <linux/errno.h>
  45 #include <linux/init.h>
  46 #include <linux/timer.h>
  47 #include <linux/list.h>
  48 #include <linux/interrupt.h>
  49 #include <linux/moduleparam.h>
  50 #include <linux/device.h>
  51 #include <linux/usb/ch9.h>
  52 #include <linux/usb/gadget.h>
  53 #include <linux/prefetch.h>
  54 #include <linux/io.h>
  55 #include <linux/iopoll.h>
  56
  57 #include <asm/byteorder.h>
  58 #include <asm/irq.h>
  59 #include <asm/unaligned.h>
  60
  61 #define DRIVER_DESC             "PLX NET228x/USB338x USB Peripheral Controller"
  62 #define DRIVER_VERSION          "2005 Sept 27/v3.0"
  63
  64 #define EP_DONTUSE              13      /* nonzero */
  65
  66 #define USE_RDK_LEDS            /* GPIO pins control three LEDs */
  67
  68
  69 static const char driver_name[] = "net2280";
  70 static const char driver_desc[] = DRIVER_DESC;
  71
  72 static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
  73 static const char ep0name[] = "ep0";
  74
  75 #define EP_INFO(_name, _caps) \
  76         { \
  77                 .name = _name, \
  78                 .caps = _caps, \
  79         }
  80
  81 static const struct {
  82         const char *name;
  83         const struct usb_ep_caps caps;
  84 } ep_info_dft[] = { /* Default endpoint configuration */
  85         EP_INFO(ep0name,
  86                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
  87         EP_INFO("ep-a",
  88                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  89         EP_INFO("ep-b",
  90                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  91         EP_INFO("ep-c",
  92                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  93         EP_INFO("ep-d",
  94                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  95         EP_INFO("ep-e",
  96                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  97         EP_INFO("ep-f",
  98                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  99         EP_INFO("ep-g",
 100                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 101         EP_INFO("ep-h",
 102                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
 103 }, ep_info_adv[] = { /* Endpoints for usb3380 advance mode */
 104         EP_INFO(ep0name,
 105                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
 106         EP_INFO("ep1in",
 107                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 108         EP_INFO("ep2out",
 109                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 110         EP_INFO("ep3in",
 111                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 112         EP_INFO("ep4out",
 113                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 114         EP_INFO("ep1out",
 115                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 116         EP_INFO("ep2in",
 117                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 118         EP_INFO("ep3out",
 119                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 120         EP_INFO("ep4in",
 121                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 122 };
 123
 124 #undef EP_INFO
 125
 126 /* mode 0 == ep-{a,b,c,d} 1K fifo each
 127  * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
 128  * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
 129  */
 130 static ushort fifo_mode;
 131
 132 /* "modprobe net2280 fifo_mode=1" etc */
 133 module_param(fifo_mode, ushort, 0644);
 134
 135 /* enable_suspend -- When enabled, the driver will respond to
 136  * USB suspend requests by powering down the NET2280.  Otherwise,
 137  * USB suspend requests will be ignored.  This is acceptable for
 138  * self-powered devices
 139  */
 140 static bool enable_suspend;
 141
 142 /* "modprobe net2280 enable_suspend=1" etc */
 143 module_param(enable_suspend, bool, 0444);
 144
 145 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
 146
 147 static char *type_string(u8 bmAttributes)
 148 {
 149         switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
 150         case USB_ENDPOINT_XFER_BULK:    return "bulk";
 151         case USB_ENDPOINT_XFER_ISOC:    return "iso";
 152         case USB_ENDPOINT_XFER_INT:     return "intr";
 153         }
 154         return "control";
 155 }
 156
 157 #include "net2280.h"
 158
 159 #define valid_bit       cpu_to_le32(BIT(VALID_BIT))
 160 #define dma_done_ie     cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
 161
 162 static void ep_clear_seqnum(struct net2280_ep *ep);
 163 static void stop_activity(struct net2280 *dev,
 164                                         struct usb_gadget_driver *driver);
 165 static void ep0_start(struct net2280 *dev);
 166
 167 /*-------------------------------------------------------------------------*/
 168 static inline void enable_pciirqenb(struct net2280_ep *ep)
 169 {
 170         u32 tmp = readl(&ep->dev->regs->pciirqenb0);
 171
 172         if (ep->dev->quirks & PLX_LEGACY)
 173                 tmp |= BIT(ep->num);
 174         else
 175                 tmp |= BIT(ep_bit[ep->num]);
 176         writel(tmp, &ep->dev->regs->pciirqenb0);
 177
 178         return;
 179 }
 180
 181 static int
 182 net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 183 {
 184         struct net2280          *dev;
 185         struct net2280_ep       *ep;
 186         u32                     max;
 187         u32 tmp = 0;
 188         u32 type;
 189         unsigned long           flags;
 190         static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
 191         int ret = 0;
 192
 193         ep = container_of(_ep, struct net2280_ep, ep);
 194         if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
 195                         desc->bDescriptorType != USB_DT_ENDPOINT) {
 196                 pr_err("%s: failed at line=%d\n", __func__, __LINE__);
 197                 return -EINVAL;
 198         }
 199         dev = ep->dev;
 200         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 201                 ret = -ESHUTDOWN;
 202                 goto print_err;
 203         }
 204
 205         /* erratum 0119 workaround ties up an endpoint number */
 206         if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
 207                 ret = -EDOM;
 208                 goto print_err;
 209         }
 210
 211         if (dev->quirks & PLX_PCIE) {
 212                 if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
 213                         ret = -EDOM;
 214                         goto print_err;
 215                 }
 216                 ep->is_in = !!usb_endpoint_dir_in(desc);
 217                 if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
 218                         ret = -EINVAL;
 219                         goto print_err;
 220                 }
 221         }
 222
 223         /* sanity check ep-e/ep-f since their fifos are small */
 224         max = usb_endpoint_maxp(desc);
 225         if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
 226                 ret = -ERANGE;
 227                 goto print_err;
 228         }
 229
 230         spin_lock_irqsave(&dev->lock, flags);
 231         _ep->maxpacket = max;
 232         ep->desc = desc;
 233
 234         /* ep_reset() has already been called */
 235         ep->stopped = 0;
 236         ep->wedged = 0;
 237         ep->out_overflow = 0;
 238
 239         /* set speed-dependent max packet; may kick in high bandwidth */
 240         set_max_speed(ep, max);
 241
 242         /* set type, direction, address; reset fifo counters */
 243         writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
 244
 245         if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
 246                 tmp = readl(&ep->cfg->ep_cfg);
 247                 /* If USB ep number doesn't match hardware ep number */
 248                 if ((tmp & 0xf) != usb_endpoint_num(desc)) {
 249                         ret = -EINVAL;
 250                         spin_unlock_irqrestore(&dev->lock, flags);
 251                         goto print_err;
 252                 }
 253                 if (ep->is_in)
 254                         tmp &= ~USB3380_EP_CFG_MASK_IN;
 255                 else
 256                         tmp &= ~USB3380_EP_CFG_MASK_OUT;
 257         }
 258         type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 259         if (type == USB_ENDPOINT_XFER_INT) {
 260                 /* erratum 0105 workaround prevents hs NYET */
 261                 if (dev->chiprev == 0100 &&
 262                                 dev->gadget.speed == USB_SPEED_HIGH &&
 263                                 !(desc->bEndpointAddress & USB_DIR_IN))
 264                         writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
 265                                 &ep->regs->ep_rsp);
 266         } else if (type == USB_ENDPOINT_XFER_BULK) {
 267                 /* catch some particularly blatant driver bugs */
 268                 if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
 269                     (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
 270                     (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
 271                         spin_unlock_irqrestore(&dev->lock, flags);
 272                         ret = -ERANGE;
 273                         goto print_err;
 274                 }
 275         }
 276         ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC);
 277         /* Enable this endpoint */
 278         if (dev->quirks & PLX_LEGACY) {
 279                 tmp |= type << ENDPOINT_TYPE;
 280                 tmp |= desc->bEndpointAddress;
 281                 /* default full fifo lines */
 282                 tmp |= (4 << ENDPOINT_BYTE_COUNT);
 283                 tmp |= BIT(ENDPOINT_ENABLE);
 284                 ep->is_in = (tmp & USB_DIR_IN) != 0;
 285         } else {
 286                 /* In Legacy mode, only OUT endpoints are used */
 287                 if (dev->enhanced_mode && ep->is_in) {
 288                         tmp |= type << IN_ENDPOINT_TYPE;
 289                         tmp |= BIT(IN_ENDPOINT_ENABLE);
 290                 } else {
 291                         tmp |= type << OUT_ENDPOINT_TYPE;
 292                         tmp |= BIT(OUT_ENDPOINT_ENABLE);
 293                         tmp |= (ep->is_in << ENDPOINT_DIRECTION);
 294                 }
 295
 296                 tmp |= (4 << ENDPOINT_BYTE_COUNT);
 297                 if (!dev->enhanced_mode)
 298                         tmp |= usb_endpoint_num(desc);
 299                 tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
 300         }
 301
 302         /* Make sure all the registers are written before ep_rsp*/
 303         wmb();
 304
 305         /* for OUT transfers, block the rx fifo until a read is posted */
 306         if (!ep->is_in)
 307                 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 308         else if (!(dev->quirks & PLX_2280)) {
 309                 /* Added for 2282, Don't use nak packets on an in endpoint,
 310                  * this was ignored on 2280
 311                  */
 312                 writel(BIT(CLEAR_NAK_OUT_PACKETS) |
 313                         BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
 314         }
 315
 316         if (dev->quirks & PLX_PCIE)
 317                 ep_clear_seqnum(ep);
 318         writel(tmp, &ep->cfg->ep_cfg);
 319
 320         /* enable irqs */
 321         if (!ep->dma) {                         /* pio, per-packet */
 322                 enable_pciirqenb(ep);
 323
 324                 tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
 325                         BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
 326                 if (dev->quirks & PLX_2280)
 327                         tmp |= readl(&ep->regs->ep_irqenb);
 328                 writel(tmp, &ep->regs->ep_irqenb);
 329         } else {                                /* dma, per-request */
 330                 tmp = BIT((8 + ep->num));       /* completion */
 331                 tmp |= readl(&dev->regs->pciirqenb1);
 332                 writel(tmp, &dev->regs->pciirqenb1);
 333
 334                 /* for short OUT transfers, dma completions can't
 335                  * advance the queue; do it pio-style, by hand.
 336                  * NOTE erratum 0112 workaround #2
 337                  */
 338                 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
 339                         tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
 340                         writel(tmp, &ep->regs->ep_irqenb);
 341
 342                         enable_pciirqenb(ep);
 343                 }
 344         }
 345
 346         tmp = desc->bEndpointAddress;
 347         ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
 348                 _ep->name, tmp & 0x0f, DIR_STRING(tmp),
 349                 type_string(desc->bmAttributes),
 350                 ep->dma ? "dma" : "pio", max);
 351
 352         /* pci writes may still be posted */
 353         spin_unlock_irqrestore(&dev->lock, flags);
 354         return ret;
 355
 356 print_err:
 357         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
 358         return ret;
 359 }
 360
 361 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
 362 {
 363         u32     result;
 364         int     ret;
 365
 366         ret = readl_poll_timeout_atomic(ptr, result,
 367                                         ((result & mask) == done ||
 368                                          result == U32_MAX),
 369                                         1, usec);
 370         if (result == U32_MAX)          /* device unplugged */
 371                 return -ENODEV;
 372
 373         return ret;
 374 }
 375
 376 static const struct usb_ep_ops net2280_ep_ops;
 377
 378 static void ep_reset_228x(struct net2280_regs __iomem *regs,
 379                           struct net2280_ep *ep)
 380 {
 381         u32             tmp;
 382
 383         ep->desc = NULL;
 384         INIT_LIST_HEAD(&ep->queue);
 385
 386         usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 387         ep->ep.ops = &net2280_ep_ops;
 388
 389         /* disable the dma, irqs, endpoint... */
 390         if (ep->dma) {
 391                 writel(0, &ep->dma->dmactl);
 392                 writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 393                         BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
 394                         BIT(DMA_ABORT),
 395                         &ep->dma->dmastat);
 396
 397                 tmp = readl(&regs->pciirqenb0);
 398                 tmp &= ~BIT(ep->num);
 399                 writel(tmp, &regs->pciirqenb0);
 400         } else {
 401                 tmp = readl(&regs->pciirqenb1);
 402                 tmp &= ~BIT((8 + ep->num));     /* completion */
 403                 writel(tmp, &regs->pciirqenb1);
 404         }
 405         writel(0, &ep->regs->ep_irqenb);
 406
 407         /* init to our chosen defaults, notably so that we NAK OUT
 408          * packets until the driver queues a read (+note erratum 0112)
 409          */
 410         if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
 411                 tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
 412                 BIT(SET_NAK_OUT_PACKETS) |
 413                 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 414                 BIT(CLEAR_INTERRUPT_MODE);
 415         } else {
 416                 /* added for 2282 */
 417                 tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
 418                 BIT(CLEAR_NAK_OUT_PACKETS) |
 419                 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
 420                 BIT(CLEAR_INTERRUPT_MODE);
 421         }
 422
 423         if (ep->num != 0) {
 424                 tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
 425                         BIT(CLEAR_ENDPOINT_HALT);
 426         }
 427         writel(tmp, &ep->regs->ep_rsp);
 428
 429         /* scrub most status bits, and flush any fifo state */
 430         if (ep->dev->quirks & PLX_2280)
 431                 tmp = BIT(FIFO_OVERFLOW) |
 432                         BIT(FIFO_UNDERFLOW);
 433         else
 434                 tmp = 0;
 435
 436         writel(tmp | BIT(TIMEOUT) |
 437                 BIT(USB_STALL_SENT) |
 438                 BIT(USB_IN_NAK_SENT) |
 439                 BIT(USB_IN_ACK_RCVD) |
 440                 BIT(USB_OUT_PING_NAK_SENT) |
 441                 BIT(USB_OUT_ACK_SENT) |
 442                 BIT(FIFO_FLUSH) |
 443                 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 444                 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 445                 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 446                 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 447                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 448                 BIT(DATA_IN_TOKEN_INTERRUPT),
 449                 &ep->regs->ep_stat);
 450
 451         /* fifo size is handled separately */
 452 }
 453
 454 static void ep_reset_338x(struct net2280_regs __iomem *regs,
 455                                         struct net2280_ep *ep)
 456 {
 457         u32 tmp, dmastat;
 458
 459         ep->desc = NULL;
 460         INIT_LIST_HEAD(&ep->queue);
 461
 462         usb_ep_set_maxpacket_limit(&ep->ep, ~0);
 463         ep->ep.ops = &net2280_ep_ops;
 464
 465         /* disable the dma, irqs, endpoint... */
 466         if (ep->dma) {
 467                 writel(0, &ep->dma->dmactl);
 468                 writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
 469                        BIT(DMA_PAUSE_DONE_INTERRUPT) |
 470                        BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 471                        BIT(DMA_TRANSACTION_DONE_INTERRUPT),
 472                        /* | BIT(DMA_ABORT), */
 473                        &ep->dma->dmastat);
 474
 475                 dmastat = readl(&ep->dma->dmastat);
 476                 if (dmastat == 0x5002) {
 477                         ep_warn(ep->dev, "The dmastat return = %x!!\n",
 478                                dmastat);
 479                         writel(0x5a, &ep->dma->dmastat);
 480                 }
 481
 482                 tmp = readl(&regs->pciirqenb0);
 483                 tmp &= ~BIT(ep_bit[ep->num]);
 484                 writel(tmp, &regs->pciirqenb0);
 485         } else {
 486                 if (ep->num < 5) {
 487                         tmp = readl(&regs->pciirqenb1);
 488                         tmp &= ~BIT((8 + ep->num));     /* completion */
 489                         writel(tmp, &regs->pciirqenb1);
 490                 }
 491         }
 492         writel(0, &ep->regs->ep_irqenb);
 493
 494         writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
 495                BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
 496                BIT(FIFO_OVERFLOW) |
 497                BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
 498                BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
 499                BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 500                BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
 501
 502         tmp = readl(&ep->cfg->ep_cfg);
 503         if (ep->is_in)
 504                 tmp &= ~USB3380_EP_CFG_MASK_IN;
 505         else
 506                 tmp &= ~USB3380_EP_CFG_MASK_OUT;
 507         writel(tmp, &ep->cfg->ep_cfg);
 508 }
 509
 510 static void nuke(struct net2280_ep *);
 511
 512 static int net2280_disable(struct usb_ep *_ep)
 513 {
 514         struct net2280_ep       *ep;
 515         unsigned long           flags;
 516
 517         ep = container_of(_ep, struct net2280_ep, ep);
 518         if (!_ep || _ep->name == ep0name) {
 519                 pr_err("%s: Invalid ep=%p\n", __func__, _ep);
 520                 return -EINVAL;
 521         }
 522         spin_lock_irqsave(&ep->dev->lock, flags);
 523         nuke(ep);
 524
 525         if (ep->dev->quirks & PLX_PCIE)
 526                 ep_reset_338x(ep->dev->regs, ep);
 527         else
 528                 ep_reset_228x(ep->dev->regs, ep);
 529
 530         ep_vdbg(ep->dev, "disabled %s %s\n",
 531                         ep->dma ? "dma" : "pio", _ep->name);
 532
 533         /* synch memory views with the device */
 534         (void)readl(&ep->cfg->ep_cfg);
 535
 536         if (!ep->dma && ep->num >= 1 && ep->num <= 4)
 537                 ep->dma = &ep->dev->dma[ep->num - 1];
 538
 539         spin_unlock_irqrestore(&ep->dev->lock, flags);
 540         return 0;
 541 }
 542
 543 /*-------------------------------------------------------------------------*/
 544
 545 static struct usb_request
 546 *net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 547 {
 548         struct net2280_ep       *ep;
 549         struct net2280_request  *req;
 550
 551         if (!_ep) {
 552                 pr_err("%s: Invalid ep\n", __func__);
 553                 return NULL;
 554         }
 555         ep = container_of(_ep, struct net2280_ep, ep);
 556
 557         req = kzalloc(sizeof(*req), gfp_flags);
 558         if (!req)
 559                 return NULL;
 560
 561         INIT_LIST_HEAD(&req->queue);
 562
 563         /* this dma descriptor may be swapped with the previous dummy */
 564         if (ep->dma) {
 565                 struct net2280_dma      *td;
 566
 567                 td = dma_pool_alloc(ep->dev->requests, gfp_flags,
 568                                 &req->td_dma);
 569                 if (!td) {
 570                         kfree(req);
 571                         return NULL;
 572                 }
 573                 td->dmacount = 0;       /* not VALID */
 574                 td->dmadesc = td->dmaaddr;
 575                 req->td = td;
 576         }
 577         return &req->req;
 578 }
 579
 580 static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
 581 {
 582         struct net2280_ep       *ep;
 583         struct net2280_request  *req;
 584
 585         ep = container_of(_ep, struct net2280_ep, ep);
 586         if (!_ep || !_req) {
 587                 dev_err(&ep->dev->pdev->dev, "%s: Invalid ep=%p or req=%p\n",
 588                                                         __func__, _ep, _req);
 589                 return;
 590         }
 591
 592         req = container_of(_req, struct net2280_request, req);
 593         WARN_ON(!list_empty(&req->queue));
 594         if (req->td)
 595                 dma_pool_free(ep->dev->requests, req->td, req->td_dma);
 596         kfree(req);
 597 }
 598
 599 /*-------------------------------------------------------------------------*/
 600
 601 /* load a packet into the fifo we use for usb IN transfers.
 602  * works for all endpoints.
 603  *
 604  * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
 605  * at a time, but this code is simpler because it knows it only writes
 606  * one packet.  ep-a..ep-d should use dma instead.
 607  */
 608 static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
 609 {
 610         struct net2280_ep_regs  __iomem *regs = ep->regs;
 611         u8                      *buf;
 612         u32                     tmp;
 613         unsigned                count, total;
 614
 615         /* INVARIANT:  fifo is currently empty. (testable) */
 616
 617         if (req) {
 618                 buf = req->buf + req->actual;
 619                 prefetch(buf);
 620                 total = req->length - req->actual;
 621         } else {
 622                 total = 0;
 623                 buf = NULL;
 624         }
 625
 626         /* write just one packet at a time */
 627         count = ep->ep.maxpacket;
 628         if (count > total)      /* min() cannot be used on a bitfield */
 629                 count = total;
 630
 631         ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
 632                         ep->ep.name, count,
 633                         (count != ep->ep.maxpacket) ? " (short)" : "",
 634                         req);
 635         while (count >= 4) {
 636                 /* NOTE be careful if you try to align these. fifo lines
 637                  * should normally be full (4 bytes) and successive partial
 638                  * lines are ok only in certain cases.
 639                  */
 640                 tmp = get_unaligned((u32 *)buf);
 641                 cpu_to_le32s(&tmp);
 642                 writel(tmp, &regs->ep_data);
 643                 buf += 4;
 644                 count -= 4;
 645         }
 646
 647         /* last fifo entry is "short" unless we wrote a full packet.
 648          * also explicitly validate last word in (periodic) transfers
 649          * when maxpacket is not a multiple of 4 bytes.
 650          */
 651         if (count || total < ep->ep.maxpacket) {
 652                 tmp = count ? get_unaligned((u32 *)buf) : count;
 653                 cpu_to_le32s(&tmp);
 654                 set_fifo_bytecount(ep, count & 0x03);
 655                 writel(tmp, &regs->ep_data);
 656         }
 657
 658         /* pci writes may still be posted */
 659 }
 660
 661 /* work around erratum 0106: PCI and USB race over the OUT fifo.
 662  * caller guarantees chiprev 0100, out endpoint is NAKing, and
 663  * there's no real data in the fifo.
 664  *
 665  * NOTE:  also used in cases where that erratum doesn't apply:
 666  * where the host wrote "too much" data to us.
 667  */
 668 static void out_flush(struct net2280_ep *ep)
 669 {
 670         u32     __iomem *statp;
 671         u32     tmp;
 672
 673         statp = &ep->regs->ep_stat;
 674
 675         tmp = readl(statp);
 676         if (tmp & BIT(NAK_OUT_PACKETS)) {
 677                 ep_dbg(ep->dev, "%s %s %08x !NAK\n",
 678                         ep->ep.name, __func__, tmp);
 679                 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 680         }
 681
 682         writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
 683                 BIT(DATA_PACKET_RECEIVED_INTERRUPT),
 684                 statp);
 685         writel(BIT(FIFO_FLUSH), statp);
 686         /* Make sure that stap is written */
 687         mb();
 688         tmp = readl(statp);
 689         if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
 690                         /* high speed did bulk NYET; fifo isn't filling */
 691                         ep->dev->gadget.speed == USB_SPEED_FULL) {
 692                 unsigned        usec;
 693
 694                 usec = 50;              /* 64 byte bulk/interrupt */
 695                 handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
 696                                 BIT(USB_OUT_PING_NAK_SENT), usec);
 697                 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
 698         }
 699 }
 700
 701 /* unload packet(s) from the fifo we use for usb OUT transfers.
 702  * returns true iff the request completed, because of short packet
 703  * or the request buffer having filled with full packets.
 704  *
 705  * for ep-a..ep-d this will read multiple packets out when they
 706  * have been accepted.
 707  */
 708 static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
 709 {
 710         struct net2280_ep_regs  __iomem *regs = ep->regs;
 711         u8                      *buf = req->req.buf + req->req.actual;
 712         unsigned                count, tmp, is_short;
 713         unsigned                cleanup = 0, prevent = 0;
 714
 715         /* erratum 0106 ... packets coming in during fifo reads might
 716          * be incompletely rejected.  not all cases have workarounds.
 717          */
 718         if (ep->dev->chiprev == 0x0100 &&
 719                         ep->dev->gadget.speed == USB_SPEED_FULL) {
 720                 udelay(1);
 721                 tmp = readl(&ep->regs->ep_stat);
 722                 if ((tmp & BIT(NAK_OUT_PACKETS)))
 723                         cleanup = 1;
 724                 else if ((tmp & BIT(FIFO_FULL))) {
 725                         start_out_naking(ep);
 726                         prevent = 1;
 727                 }
 728                 /* else: hope we don't see the problem */
 729         }
 730
 731         /* never overflow the rx buffer. the fifo reads packets until
 732          * it sees a short one; we might not be ready for them all.
 733          */
 734         prefetchw(buf);
 735         count = readl(&regs->ep_avail);
 736         if (unlikely(count == 0)) {
 737                 udelay(1);
 738                 tmp = readl(&ep->regs->ep_stat);
 739                 count = readl(&regs->ep_avail);
 740                 /* handled that data already? */
 741                 if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
 742                         return 0;
 743         }
 744
 745         tmp = req->req.length - req->req.actual;
 746         if (count > tmp) {
 747                 /* as with DMA, data overflow gets flushed */
 748                 if ((tmp % ep->ep.maxpacket) != 0) {
 749                         ep_err(ep->dev,
 750                                 "%s out fifo %d bytes, expected %d\n",
 751                                 ep->ep.name, count, tmp);
 752                         req->req.status = -EOVERFLOW;
 753                         cleanup = 1;
 754                         /* NAK_OUT_PACKETS will be set, so flushing is safe;
 755                          * the next read will start with the next packet
 756                          */
 757                 } /* else it's a ZLP, no worries */
 758                 count = tmp;
 759         }
 760         req->req.actual += count;
 761
 762         is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
 763
 764         ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
 765                         ep->ep.name, count, is_short ? " (short)" : "",
 766                         cleanup ? " flush" : "", prevent ? " nak" : "",
 767                         req, req->req.actual, req->req.length);
 768
 769         while (count >= 4) {
 770                 tmp = readl(&regs->ep_data);
 771                 cpu_to_le32s(&tmp);
 772                 put_unaligned(tmp, (u32 *)buf);
 773                 buf += 4;
 774                 count -= 4;
 775         }
 776         if (count) {
 777                 tmp = readl(&regs->ep_data);
 778                 /* LE conversion is implicit here: */
 779                 do {
 780                         *buf++ = (u8) tmp;
 781                         tmp >>= 8;
 782                 } while (--count);
 783         }
 784         if (cleanup)
 785                 out_flush(ep);
 786         if (prevent) {
 787                 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 788                 (void) readl(&ep->regs->ep_rsp);
 789         }
 790
 791         return is_short || req->req.actual == req->req.length;
 792 }
 793
 794 /* fill out dma descriptor to match a given request */
 795 static void fill_dma_desc(struct net2280_ep *ep,
 796                                         struct net2280_request *req, int valid)
 797 {
 798         struct net2280_dma      *td = req->td;
 799         u32                     dmacount = req->req.length;
 800
 801         /* don't let DMA continue after a short OUT packet,
 802          * so overruns can't affect the next transfer.
 803          * in case of overruns on max-size packets, we can't
 804          * stop the fifo from filling but we can flush it.
 805          */
 806         if (ep->is_in)
 807                 dmacount |= BIT(DMA_DIRECTION);
 808         if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
 809                                         !(ep->dev->quirks & PLX_2280))
 810                 dmacount |= BIT(END_OF_CHAIN);
 811
 812         req->valid = valid;
 813         if (valid)
 814                 dmacount |= BIT(VALID_BIT);
 815         dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
 816
 817         /* td->dmadesc = previously set by caller */
 818         td->dmaaddr = cpu_to_le32 (req->req.dma);
 819
 820         /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
 821         wmb();
 822         td->dmacount = cpu_to_le32(dmacount);
 823 }
 824
 825 static const u32 dmactl_default =
 826                 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
 827                 BIT(DMA_CLEAR_COUNT_ENABLE) |
 828                 /* erratum 0116 workaround part 1 (use POLLING) */
 829                 (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
 830                 BIT(DMA_VALID_BIT_POLLING_ENABLE) |
 831                 BIT(DMA_VALID_BIT_ENABLE) |
 832                 BIT(DMA_SCATTER_GATHER_ENABLE) |
 833                 /* erratum 0116 workaround part 2 (no AUTOSTART) */
 834                 BIT(DMA_ENABLE);
 835
 836 static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
 837 {
 838         handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
 839 }
 840
 841 static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
 842 {
 843         writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
 844         spin_stop_dma(dma);
 845 }
 846
 847 static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
 848 {
 849         struct net2280_dma_regs __iomem *dma = ep->dma;
 850         unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
 851
 852         if (!(ep->dev->quirks & PLX_2280))
 853                 tmp |= BIT(END_OF_CHAIN);
 854
 855         writel(tmp, &dma->dmacount);
 856         writel(readl(&dma->dmastat), &dma->dmastat);
 857
 858         writel(td_dma, &dma->dmadesc);
 859         if (ep->dev->quirks & PLX_PCIE)
 860                 dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
 861         writel(dmactl, &dma->dmactl);
 862
 863         /* erratum 0116 workaround part 3:  pci arbiter away from net2280 */
 864         (void) readl(&ep->dev->pci->pcimstctl);
 865
 866         writel(BIT(DMA_START), &dma->dmastat);
 867 }
 868
 869 static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
 870 {
 871         u32                     tmp;
 872         struct net2280_dma_regs __iomem *dma = ep->dma;
 873
 874         /* FIXME can't use DMA for ZLPs */
 875
 876         /* on this path we "know" there's no dma active (yet) */
 877         WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
 878         writel(0, &ep->dma->dmactl);
 879
 880         /* previous OUT packet might have been short */
 881         if (!ep->is_in && (readl(&ep->regs->ep_stat) &
 882                                 BIT(NAK_OUT_PACKETS))) {
 883                 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
 884                         &ep->regs->ep_stat);
 885
 886                 tmp = readl(&ep->regs->ep_avail);
 887                 if (tmp) {
 888                         writel(readl(&dma->dmastat), &dma->dmastat);
 889
 890                         /* transfer all/some fifo data */
 891                         writel(req->req.dma, &dma->dmaaddr);
 892                         tmp = min(tmp, req->req.length);
 893
 894                         /* dma irq, faking scatterlist status */
 895                         req->td->dmacount = cpu_to_le32(req->req.length - tmp);
 896                         writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
 897                                         &dma->dmacount);
 898                         req->td->dmadesc = 0;
 899                         req->valid = 1;
 900
 901                         writel(BIT(DMA_ENABLE), &dma->dmactl);
 902                         writel(BIT(DMA_START), &dma->dmastat);
 903                         return;
 904                 }
 905                 stop_out_naking(ep);
 906         }
 907
 908         tmp = dmactl_default;
 909
 910         /* force packet boundaries between dma requests, but prevent the
 911          * controller from automagically writing a last "short" packet
 912          * (zero length) unless the driver explicitly said to do that.
 913          */
 914         if (ep->is_in) {
 915                 if (likely((req->req.length % ep->ep.maxpacket) ||
 916                                                         req->req.zero)){
 917                         tmp |= BIT(DMA_FIFO_VALIDATE);
 918                         ep->in_fifo_validate = 1;
 919                 } else
 920                         ep->in_fifo_validate = 0;
 921         }
 922
 923         /* init req->td, pointing to the current dummy */
 924         req->td->dmadesc = cpu_to_le32 (ep->td_dma);
 925         fill_dma_desc(ep, req, 1);
 926
 927         req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
 928
 929         start_queue(ep, tmp, req->td_dma);
 930 }
 931
 932 static inline void
 933 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
 934 {
 935         struct net2280_dma      *end;
 936         dma_addr_t              tmp;
 937
 938         /* swap new dummy for old, link; fill and maybe activate */
 939         end = ep->dummy;
 940         ep->dummy = req->td;
 941         req->td = end;
 942
 943         tmp = ep->td_dma;
 944         ep->td_dma = req->td_dma;
 945         req->td_dma = tmp;
 946
 947         end->dmadesc = cpu_to_le32 (ep->td_dma);
 948
 949         fill_dma_desc(ep, req, valid);
 950 }
 951
 952 static void
 953 done(struct net2280_ep *ep, struct net2280_request *req, int status)
 954 {
 955         struct net2280          *dev;
 956         unsigned                stopped = ep->stopped;
 957
 958         list_del_init(&req->queue);
 959
 960         if (req->req.status == -EINPROGRESS)
 961                 req->req.status = status;
 962         else
 963                 status = req->req.status;
 964
 965         dev = ep->dev;
 966         if (ep->dma)
 967                 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
 968
 969         if (status && status != -ESHUTDOWN)
 970                 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
 971                         ep->ep.name, &req->req, status,
 972                         req->req.actual, req->req.length);
 973
 974         /* don't modify queue heads during completion callback */
 975         ep->stopped = 1;
 976         spin_unlock(&dev->lock);
 977         usb_gadget_giveback_request(&ep->ep, &req->req);
 978         spin_lock(&dev->lock);
 979         ep->stopped = stopped;
 980 }
 981
 982 /*-------------------------------------------------------------------------*/
 983
 984 static int
 985 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 986 {
 987         struct net2280_request  *req;
 988         struct net2280_ep       *ep;
 989         struct net2280          *dev;
 990         unsigned long           flags;
 991         int ret = 0;
 992
 993         /* we always require a cpu-view buffer, so that we can
 994          * always use pio (as fallback or whatever).
 995          */
 996         ep = container_of(_ep, struct net2280_ep, ep);
 997         if (!_ep || (!ep->desc && ep->num != 0)) {
 998                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
 999                 return -EINVAL;
1000         }
1001         req = container_of(_req, struct net2280_request, req);
1002         if (!_req || !_req->complete || !_req->buf ||
1003                                 !list_empty(&req->queue)) {
1004                 ret = -EINVAL;
1005                 goto print_err;
1006         }
1007         if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
1008                 ret = -EDOM;
1009                 goto print_err;
1010         }
1011         dev = ep->dev;
1012         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
1013                 ret = -ESHUTDOWN;
1014                 goto print_err;
1015         }
1016
1017         /* FIXME implement PIO fallback for ZLPs with DMA */
1018         if (ep->dma && _req->length == 0) {
1019                 ret = -EOPNOTSUPP;
1020                 goto print_err;
1021         }
1022
1023         /* set up dma mapping in case the caller didn't */
1024         if (ep->dma) {
1025                 ret = usb_gadget_map_request(&dev->gadget, _req,
1026                                 ep->is_in);
1027                 if (ret)
1028                         goto print_err;
1029         }
1030
1031         ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
1032                         _ep->name, _req, _req->length, _req->buf);
1033
1034         spin_lock_irqsave(&dev->lock, flags);
1035
1036         _req->status = -EINPROGRESS;
1037         _req->actual = 0;
1038
1039         /* kickstart this i/o queue? */
1040         if  (list_empty(&ep->queue) && !ep->stopped &&
1041                 !((dev->quirks & PLX_PCIE) && ep->dma &&
1042                   (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1043
1044                 /* use DMA if the endpoint supports it, else pio */
1045                 if (ep->dma)
1046                         start_dma(ep, req);
1047                 else {
1048                         /* maybe there's no control data, just status ack */
1049                         if (ep->num == 0 && _req->length == 0) {
1050                                 allow_status(ep);
1051                                 done(ep, req, 0);
1052                                 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1053                                 goto done;
1054                         }
1055
1056                         /* PIO ... stuff the fifo, or unblock it.  */
1057                         if (ep->is_in)
1058                                 write_fifo(ep, _req);
1059                         else {
1060                                 u32     s;
1061
1062                                 /* OUT FIFO might have packet(s) buffered */
1063                                 s = readl(&ep->regs->ep_stat);
1064                                 if ((s & BIT(FIFO_EMPTY)) == 0) {
1065                                         /* note:  _req->short_not_ok is
1066                                          * ignored here since PIO _always_
1067                                          * stops queue advance here, and
1068                                          * _req->status doesn't change for
1069                                          * short reads (only _req->actual)
1070                                          */
1071                                         if (read_fifo(ep, req) &&
1072                                                         ep->num == 0) {
1073                                                 done(ep, req, 0);
1074                                                 allow_status(ep);
1075                                                 /* don't queue it */
1076                                                 req = NULL;
1077                                         } else if (read_fifo(ep, req) &&
1078                                                         ep->num != 0) {
1079                                                 done(ep, req, 0);
1080                                                 req = NULL;
1081                                         } else
1082                                                 s = readl(&ep->regs->ep_stat);
1083                                 }
1084
1085                                 /* don't NAK, let the fifo fill */
1086                                 if (req && (s & BIT(NAK_OUT_PACKETS)))
1087                                         writel(BIT(CLEAR_NAK_OUT_PACKETS),
1088                                                         &ep->regs->ep_rsp);
1089                         }
1090                 }
1091
1092         } else if (ep->dma) {
1093                 int     valid = 1;
1094
1095                 if (ep->is_in) {
1096                         int     expect;
1097
1098                         /* preventing magic zlps is per-engine state, not
1099                          * per-transfer; irq logic must recover hiccups.
1100                          */
1101                         expect = likely(req->req.zero ||
1102                                 (req->req.length % ep->ep.maxpacket));
1103                         if (expect != ep->in_fifo_validate)
1104                                 valid = 0;
1105                 }
1106                 queue_dma(ep, req, valid);
1107
1108         } /* else the irq handler advances the queue. */
1109
1110         ep->responded = 1;
1111         if (req)
1112                 list_add_tail(&req->queue, &ep->queue);
1113 done:
1114         spin_unlock_irqrestore(&dev->lock, flags);
1115
1116         /* pci writes may still be posted */
1117         return ret;
1118
1119 print_err:
1120         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1121         return ret;
1122 }
1123
1124 static inline void
1125 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1126                 int status)
1127 {
1128         req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1129         done(ep, req, status);
1130 }
1131
1132 static int scan_dma_completions(struct net2280_ep *ep)
1133 {
1134         int num_completed = 0;
1135
1136         /* only look at descriptors that were "naturally" retired,
1137          * so fifo and list head state won't matter
1138          */
1139         while (!list_empty(&ep->queue)) {
1140                 struct net2280_request  *req;
1141                 u32 req_dma_count;
1142
1143                 req = list_entry(ep->queue.next,
1144                                 struct net2280_request, queue);
1145                 if (!req->valid)
1146                         break;
1147                 rmb();
1148                 req_dma_count = le32_to_cpup(&req->td->dmacount);
1149                 if ((req_dma_count & BIT(VALID_BIT)) != 0)
1150                         break;
1151
1152                 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1153                  * cases where DMA must be aborted; this code handles
1154                  * all non-abort DMA completions.
1155                  */
1156                 if (unlikely(req->td->dmadesc == 0)) {
1157                         /* paranoia */
1158                         u32 const ep_dmacount = readl(&ep->dma->dmacount);
1159
1160                         if (ep_dmacount & DMA_BYTE_COUNT_MASK)
1161                                 break;
1162                         /* single transfer mode */
1163                         dma_done(ep, req, req_dma_count, 0);
1164                         num_completed++;
1165                         break;
1166                 } else if (!ep->is_in &&
1167                            (req->req.length % ep->ep.maxpacket) &&
1168                            !(ep->dev->quirks & PLX_PCIE)) {
1169
1170                         u32 const ep_stat = readl(&ep->regs->ep_stat);
1171                         /* AVOID TROUBLE HERE by not issuing short reads from
1172                          * your gadget driver.  That helps avoids errata 0121,
1173                          * 0122, and 0124; not all cases trigger the warning.
1174                          */
1175                         if ((ep_stat & BIT(NAK_OUT_PACKETS)) == 0) {
1176                                 ep_warn(ep->dev, "%s lost packet sync!\n",
1177                                                 ep->ep.name);
1178                                 req->req.status = -EOVERFLOW;
1179                         } else {
1180                                 u32 const ep_avail = readl(&ep->regs->ep_avail);
1181                                 if (ep_avail) {
1182                                         /* fifo gets flushed later */
1183                                         ep->out_overflow = 1;
1184                                         ep_dbg(ep->dev,
1185                                                 "%s dma, discard %d len %d\n",
1186                                                 ep->ep.name, ep_avail,
1187                                                 req->req.length);
1188                                         req->req.status = -EOVERFLOW;
1189                                 }
1190                         }
1191                 }
1192                 dma_done(ep, req, req_dma_count, 0);
1193                 num_completed++;
1194         }
1195
1196         return num_completed;
1197 }
1198
1199 static void restart_dma(struct net2280_ep *ep)
1200 {
1201         struct net2280_request  *req;
1202
1203         if (ep->stopped)
1204                 return;
1205         req = list_entry(ep->queue.next, struct net2280_request, queue);
1206
1207         start_dma(ep, req);
1208 }
1209
1210 static void abort_dma(struct net2280_ep *ep)
1211 {
1212         /* abort the current transfer */
1213         if (likely(!list_empty(&ep->queue))) {
1214                 /* FIXME work around errata 0121, 0122, 0124 */
1215                 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1216                 spin_stop_dma(ep->dma);
1217         } else
1218                 stop_dma(ep->dma);
1219         scan_dma_completions(ep);
1220 }
1221
1222 /* dequeue ALL requests */
1223 static void nuke(struct net2280_ep *ep)
1224 {
1225         struct net2280_request  *req;
1226
1227         /* called with spinlock held */
1228         ep->stopped = 1;
1229         if (ep->dma)
1230                 abort_dma(ep);
1231         while (!list_empty(&ep->queue)) {
1232                 req = list_entry(ep->queue.next,
1233                                 struct net2280_request,
1234                                 queue);
1235                 done(ep, req, -ESHUTDOWN);
1236         }
1237 }
1238
1239 /* dequeue JUST ONE request */
1240 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1241 {
1242         struct net2280_ep       *ep;
1243         struct net2280_request  *req;
1244         unsigned long           flags;
1245         u32                     dmactl;
1246         int                     stopped;
1247
1248         ep = container_of(_ep, struct net2280_ep, ep);
1249         if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1250                 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1251                                                 __func__, _ep, _req);
1252                 return -EINVAL;
1253         }
1254
1255         spin_lock_irqsave(&ep->dev->lock, flags);
1256         stopped = ep->stopped;
1257
1258         /* quiesce dma while we patch the queue */
1259         dmactl = 0;
1260         ep->stopped = 1;
1261         if (ep->dma) {
1262                 dmactl = readl(&ep->dma->dmactl);
1263                 /* WARNING erratum 0127 may kick in ... */
1264                 stop_dma(ep->dma);
1265                 scan_dma_completions(ep);
1266         }
1267
1268         /* make sure it's still queued on this endpoint */
1269         list_for_each_entry(req, &ep->queue, queue) {
1270                 if (&req->req == _req)
1271                         break;
1272         }
1273         if (&req->req != _req) {
1274                 ep->stopped = stopped;
1275                 spin_unlock_irqrestore(&ep->dev->lock, flags);
1276                 ep_dbg(ep->dev, "%s: Request mismatch\n", __func__);
1277                 return -EINVAL;
1278         }
1279
1280         /* queue head may be partially complete. */
1281         if (ep->queue.next == &req->queue) {
1282                 if (ep->dma) {
1283                         ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1284                         _req->status = -ECONNRESET;
1285                         abort_dma(ep);
1286                         if (likely(ep->queue.next == &req->queue)) {
1287                                 /* NOTE: misreports single-transfer mode*/
1288                                 req->td->dmacount = 0;  /* invalidate */
1289                                 dma_done(ep, req,
1290                                         readl(&ep->dma->dmacount),
1291                                         -ECONNRESET);
1292                         }
1293                 } else {
1294                         ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1295                         done(ep, req, -ECONNRESET);
1296                 }
1297                 req = NULL;
1298         }
1299
1300         if (req)
1301                 done(ep, req, -ECONNRESET);
1302         ep->stopped = stopped;
1303
1304         if (ep->dma) {
1305                 /* turn off dma on inactive queues */
1306                 if (list_empty(&ep->queue))
1307                         stop_dma(ep->dma);
1308                 else if (!ep->stopped) {
1309                         /* resume current request, or start new one */
1310                         if (req)
1311                                 writel(dmactl, &ep->dma->dmactl);
1312                         else
1313                                 start_dma(ep, list_entry(ep->queue.next,
1314                                         struct net2280_request, queue));
1315                 }
1316         }
1317
1318         spin_unlock_irqrestore(&ep->dev->lock, flags);
1319         return 0;
1320 }
1321
1322 /*-------------------------------------------------------------------------*/
1323
1324 static int net2280_fifo_status(struct usb_ep *_ep);
1325
1326 static int
1327 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1328 {
1329         struct net2280_ep       *ep;
1330         unsigned long           flags;
1331         int                     retval = 0;
1332
1333         ep = container_of(_ep, struct net2280_ep, ep);
1334         if (!_ep || (!ep->desc && ep->num != 0)) {
1335                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1336                 return -EINVAL;
1337         }
1338         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1339                 retval = -ESHUTDOWN;
1340                 goto print_err;
1341         }
1342         if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1343                                                 == USB_ENDPOINT_XFER_ISOC) {
1344                 retval = -EINVAL;
1345                 goto print_err;
1346         }
1347
1348         spin_lock_irqsave(&ep->dev->lock, flags);
1349         if (!list_empty(&ep->queue)) {
1350                 retval = -EAGAIN;
1351                 goto print_unlock;
1352         } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1353                 retval = -EAGAIN;
1354                 goto print_unlock;
1355         } else {
1356                 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1357                                 value ? "set" : "clear",
1358                                 wedged ? "wedge" : "halt");
1359                 /* set/clear, then synch memory views with the device */
1360                 if (value) {
1361                         if (ep->num == 0)
1362                                 ep->dev->protocol_stall = 1;
1363                         else
1364                                 set_halt(ep);
1365                         if (wedged)
1366                                 ep->wedged = 1;
1367                 } else {
1368                         clear_halt(ep);
1369                         if (ep->dev->quirks & PLX_PCIE &&
1370                                 !list_empty(&ep->queue) && ep->td_dma)
1371                                         restart_dma(ep);
1372                         ep->wedged = 0;
1373                 }
1374                 (void) readl(&ep->regs->ep_rsp);
1375         }
1376         spin_unlock_irqrestore(&ep->dev->lock, flags);
1377
1378         return retval;
1379
1380 print_unlock:
1381         spin_unlock_irqrestore(&ep->dev->lock, flags);
1382 print_err:
1383         dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1384         return retval;
1385 }
1386
1387 static int net2280_set_halt(struct usb_ep *_ep, int value)
1388 {
1389         return net2280_set_halt_and_wedge(_ep, value, 0);
1390 }
1391
1392 static int net2280_set_wedge(struct usb_ep *_ep)
1393 {
1394         if (!_ep || _ep->name == ep0name) {
1395                 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1396                 return -EINVAL;
1397         }
1398         return net2280_set_halt_and_wedge(_ep, 1, 1);
1399 }
1400
1401 static int net2280_fifo_status(struct usb_ep *_ep)
1402 {
1403         struct net2280_ep       *ep;
1404         u32                     avail;
1405
1406         ep = container_of(_ep, struct net2280_ep, ep);
1407         if (!_ep || (!ep->desc && ep->num != 0)) {
1408                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1409                 return -ENODEV;
1410         }
1411         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1412                 dev_err(&ep->dev->pdev->dev,
1413                         "%s: Invalid driver=%p or speed=%d\n",
1414                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1415                 return -ESHUTDOWN;
1416         }
1417
1418         avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1419         if (avail > ep->fifo_size) {
1420                 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1421                 return -EOVERFLOW;
1422         }
1423         if (ep->is_in)
1424                 avail = ep->fifo_size - avail;
1425         return avail;
1426 }
1427
1428 static void net2280_fifo_flush(struct usb_ep *_ep)
1429 {
1430         struct net2280_ep       *ep;
1431
1432         ep = container_of(_ep, struct net2280_ep, ep);
1433         if (!_ep || (!ep->desc && ep->num != 0)) {
1434                 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1435                 return;
1436         }
1437         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1438                 dev_err(&ep->dev->pdev->dev,
1439                         "%s: Invalid driver=%p or speed=%d\n",
1440                         __func__, ep->dev->driver, ep->dev->gadget.speed);
1441                 return;
1442         }
1443
1444         writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1445         (void) readl(&ep->regs->ep_rsp);
1446 }
1447
1448 static const struct usb_ep_ops net2280_ep_ops = {
1449         .enable         = net2280_enable,
1450         .disable        = net2280_disable,
1451
1452         .alloc_request  = net2280_alloc_request,
1453         .free_request   = net2280_free_request,
1454
1455         .queue          = net2280_queue,
1456         .dequeue        = net2280_dequeue,
1457
1458         .set_halt       = net2280_set_halt,
1459         .set_wedge      = net2280_set_wedge,
1460         .fifo_status    = net2280_fifo_status,
1461         .fifo_flush     = net2280_fifo_flush,
1462 };
1463
1464 /*-------------------------------------------------------------------------*/
1465
1466 static int net2280_get_frame(struct usb_gadget *_gadget)
1467 {
1468         struct net2280          *dev;
1469         unsigned long           flags;
1470         u16                     retval;
1471
1472         if (!_gadget)
1473                 return -ENODEV;
1474         dev = container_of(_gadget, struct net2280, gadget);
1475         spin_lock_irqsave(&dev->lock, flags);
1476         retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1477         spin_unlock_irqrestore(&dev->lock, flags);
1478         return retval;
1479 }
1480
1481 static int net2280_wakeup(struct usb_gadget *_gadget)
1482 {
1483         struct net2280          *dev;
1484         u32                     tmp;
1485         unsigned long           flags;
1486
1487         if (!_gadget)
1488                 return 0;
1489         dev = container_of(_gadget, struct net2280, gadget);
1490
1491         spin_lock_irqsave(&dev->lock, flags);
1492         tmp = readl(&dev->usb->usbctl);
1493         if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1494                 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1495         spin_unlock_irqrestore(&dev->lock, flags);
1496
1497         /* pci writes may still be posted */
1498         return 0;
1499 }
1500
1501 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1502 {
1503         struct net2280          *dev;
1504         u32                     tmp;
1505         unsigned long           flags;
1506
1507         if (!_gadget)
1508                 return 0;
1509         dev = container_of(_gadget, struct net2280, gadget);
1510
1511         spin_lock_irqsave(&dev->lock, flags);
1512         tmp = readl(&dev->usb->usbctl);
1513         if (value) {
1514                 tmp |= BIT(SELF_POWERED_STATUS);
1515                 _gadget->is_selfpowered = 1;
1516         } else {
1517                 tmp &= ~BIT(SELF_POWERED_STATUS);
1518                 _gadget->is_selfpowered = 0;
1519         }
1520         writel(tmp, &dev->usb->usbctl);
1521         spin_unlock_irqrestore(&dev->lock, flags);
1522
1523         return 0;
1524 }
1525
1526 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1527 {
1528         struct net2280  *dev;
1529         u32             tmp;
1530         unsigned long   flags;
1531
1532         if (!_gadget)
1533                 return -ENODEV;
1534         dev = container_of(_gadget, struct net2280, gadget);
1535
1536         spin_lock_irqsave(&dev->lock, flags);
1537         tmp = readl(&dev->usb->usbctl);
1538         dev->softconnect = (is_on != 0);
1539         if (is_on) {
1540                 ep0_start(dev);
1541                 writel(tmp | BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1542         } else {
1543                 writel(tmp & ~BIT(USB_DETECT_ENABLE), &dev->usb->usbctl);
1544                 stop_activity(dev, NULL);
1545         }
1546
1547         spin_unlock_irqrestore(&dev->lock, flags);
1548
1549         return 0;
1550 }
1551
1552 static struct usb_ep *net2280_match_ep(struct usb_gadget *_gadget,
1553                 struct usb_endpoint_descriptor *desc,
1554                 struct usb_ss_ep_comp_descriptor *ep_comp)
1555 {
1556         char name[8];
1557         struct usb_ep *ep;
1558
1559         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT) {
1560                 /* ep-e, ep-f are PIO with only 64 byte fifos */
1561                 ep = gadget_find_ep_by_name(_gadget, "ep-e");
1562                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1563                         return ep;
1564                 ep = gadget_find_ep_by_name(_gadget, "ep-f");
1565                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1566                         return ep;
1567         }
1568
1569         /* USB3380: Only first four endpoints have DMA channels. Allocate
1570          * slower interrupt endpoints from PIO hw endpoints, to allow bulk/isoc
1571          * endpoints use DMA hw endpoints.
1572          */
1573         if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1574             usb_endpoint_dir_in(desc)) {
1575                 ep = gadget_find_ep_by_name(_gadget, "ep2in");
1576                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1577                         return ep;
1578                 ep = gadget_find_ep_by_name(_gadget, "ep4in");
1579                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1580                         return ep;
1581         } else if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
1582                    !usb_endpoint_dir_in(desc)) {
1583                 ep = gadget_find_ep_by_name(_gadget, "ep1out");
1584                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1585                         return ep;
1586                 ep = gadget_find_ep_by_name(_gadget, "ep3out");
1587                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1588                         return ep;
1589         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1590                    usb_endpoint_dir_in(desc)) {
1591                 ep = gadget_find_ep_by_name(_gadget, "ep1in");
1592                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1593                         return ep;
1594                 ep = gadget_find_ep_by_name(_gadget, "ep3in");
1595                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1596                         return ep;
1597         } else if (usb_endpoint_type(desc) != USB_ENDPOINT_XFER_BULK &&
1598                    !usb_endpoint_dir_in(desc)) {
1599                 ep = gadget_find_ep_by_name(_gadget, "ep2out");
1600                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1601                         return ep;
1602                 ep = gadget_find_ep_by_name(_gadget, "ep4out");
1603                 if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1604                         return ep;
1605         }
1606
1607         /* USB3380: use same address for usb and hardware endpoints */
1608         snprintf(name, sizeof(name), "ep%d%s", usb_endpoint_num(desc),
1609                         usb_endpoint_dir_in(desc) ? "in" : "out");
1610         ep = gadget_find_ep_by_name(_gadget, name);
1611         if (ep && usb_gadget_ep_match_desc(_gadget, ep, desc, ep_comp))
1612                 return ep;
1613
1614         return NULL;
1615 }
1616
1617 static int net2280_start(struct usb_gadget *_gadget,
1618                 struct usb_gadget_driver *driver);
1619 static int net2280_stop(struct usb_gadget *_gadget);
1620 static void net2280_async_callbacks(struct usb_gadget *_gadget, bool enable);
1621
1622 static const struct usb_gadget_ops net2280_ops = {
1623         .get_frame      = net2280_get_frame,
1624         .wakeup         = net2280_wakeup,
1625         .set_selfpowered = net2280_set_selfpowered,
1626         .pullup         = net2280_pullup,
1627         .udc_start      = net2280_start,
1628         .udc_stop       = net2280_stop,
1629         .udc_async_callbacks = net2280_async_callbacks,
1630         .match_ep       = net2280_match_ep,
1631 };
1632
1633 /*-------------------------------------------------------------------------*/
1634
1635 #ifdef  CONFIG_USB_GADGET_DEBUG_FILES
1636
1637 /* FIXME move these into procfs, and use seq_file.
1638  * Sysfs _still_ doesn't behave for arbitrarily sized files,
1639  * and also doesn't help products using this with 2.4 kernels.
1640  */
1641
1642 /* "function" sysfs attribute */
1643 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1644                              char *buf)
1645 {
1646         struct net2280  *dev = dev_get_drvdata(_dev);
1647
1648         if (!dev->driver || !dev->driver->function ||
1649                         strlen(dev->driver->function) > PAGE_SIZE)
1650                 return 0;
1651         return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1652 }
1653 static DEVICE_ATTR_RO(function);
1654
1655 static ssize_t registers_show(struct device *_dev,
1656                               struct device_attribute *attr, char *buf)
1657 {
1658         struct net2280          *dev;
1659         char                    *next;
1660         unsigned                size, t;
1661         unsigned long           flags;
1662         int                     i;
1663         u32                     t1, t2;
1664         const char              *s;
1665
1666         dev = dev_get_drvdata(_dev);
1667         next = buf;
1668         size = PAGE_SIZE;
1669         spin_lock_irqsave(&dev->lock, flags);
1670
1671         if (dev->driver)
1672                 s = dev->driver->driver.name;
1673         else
1674                 s = "(none)";
1675
1676         /* Main Control Registers */
1677         t = scnprintf(next, size, "%s version " DRIVER_VERSION
1678                         ", chiprev %04x\n\n"
1679                         "devinit %03x fifoctl %08x gadget '%s'\n"
1680                         "pci irqenb0 %02x irqenb1 %08x "
1681                         "irqstat0 %04x irqstat1 %08x\n",
1682                         driver_name, dev->chiprev,
1683                         readl(&dev->regs->devinit),
1684                         readl(&dev->regs->fifoctl),
1685                         s,
1686                         readl(&dev->regs->pciirqenb0),
1687                         readl(&dev->regs->pciirqenb1),
1688                         readl(&dev->regs->irqstat0),
1689                         readl(&dev->regs->irqstat1));
1690         size -= t;
1691         next += t;
1692
1693         /* USB Control Registers */
1694         t1 = readl(&dev->usb->usbctl);
1695         t2 = readl(&dev->usb->usbstat);
1696         if (t1 & BIT(VBUS_PIN)) {
1697                 if (t2 & BIT(HIGH_SPEED))
1698                         s = "high speed";
1699                 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1700                         s = "powered";
1701                 else
1702                         s = "full speed";
1703                 /* full speed bit (6) not working?? */
1704         } else
1705                         s = "not attached";
1706         t = scnprintf(next, size,
1707                         "stdrsp %08x usbctl %08x usbstat %08x "
1708                                 "addr 0x%02x (%s)\n",
1709                         readl(&dev->usb->stdrsp), t1, t2,
1710                         readl(&dev->usb->ouraddr), s);
1711         size -= t;
1712         next += t;
1713
1714         /* PCI Master Control Registers */
1715
1716         /* DMA Control Registers */
1717
1718         /* Configurable EP Control Registers */
1719         for (i = 0; i < dev->n_ep; i++) {
1720                 struct net2280_ep       *ep;
1721
1722                 ep = &dev->ep[i];
1723                 if (i && !ep->desc)
1724                         continue;
1725
1726                 t1 = readl(&ep->cfg->ep_cfg);
1727                 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1728                 t = scnprintf(next, size,
1729                                 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1730                                         "irqenb %02x\n",
1731                                 ep->ep.name, t1, t2,
1732                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1733                                         ? "NAK " : "",
1734                                 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1735                                         ? "hide " : "",
1736                                 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1737                                         ? "CRC " : "",
1738                                 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1739                                         ? "interrupt " : "",
1740                                 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1741                                         ? "status " : "",
1742                                 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1743                                         ? "NAKmode " : "",
1744                                 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1745                                         ? "DATA1 " : "DATA0 ",
1746                                 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1747                                         ? "HALT " : "",
1748                                 readl(&ep->regs->ep_irqenb));
1749                 size -= t;
1750                 next += t;
1751
1752                 t = scnprintf(next, size,
1753                                 "\tstat %08x avail %04x "
1754                                 "(ep%d%s-%s)%s\n",
1755                                 readl(&ep->regs->ep_stat),
1756                                 readl(&ep->regs->ep_avail),
1757                                 t1 & 0x0f, DIR_STRING(t1),
1758                                 type_string(t1 >> 8),
1759                                 ep->stopped ? "*" : "");
1760                 size -= t;
1761                 next += t;
1762
1763                 if (!ep->dma)
1764                         continue;
1765
1766                 t = scnprintf(next, size,
1767                                 "  dma\tctl %08x stat %08x count %08x\n"
1768                                 "\taddr %08x desc %08x\n",
1769                                 readl(&ep->dma->dmactl),
1770                                 readl(&ep->dma->dmastat),
1771                                 readl(&ep->dma->dmacount),
1772                                 readl(&ep->dma->dmaaddr),
1773                                 readl(&ep->dma->dmadesc));
1774                 size -= t;
1775                 next += t;
1776
1777         }
1778
1779         /* Indexed Registers (none yet) */
1780
1781         /* Statistics */
1782         t = scnprintf(next, size, "\nirqs:  ");
1783         size -= t;
1784         next += t;
1785         for (i = 0; i < dev->n_ep; i++) {
1786                 struct net2280_ep       *ep;
1787
1788                 ep = &dev->ep[i];
1789                 if (i && !ep->irqs)
1790                         continue;
1791                 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1792                 size -= t;
1793                 next += t;
1794
1795         }
1796         t = scnprintf(next, size, "\n");
1797         size -= t;
1798         next += t;
1799
1800         spin_unlock_irqrestore(&dev->lock, flags);
1801
1802         return PAGE_SIZE - size;
1803 }
1804 static DEVICE_ATTR_RO(registers);
1805
1806 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1807                            char *buf)
1808 {
1809         struct net2280          *dev;
1810         char                    *next;
1811         unsigned                size;
1812         unsigned long           flags;
1813         int                     i;
1814
1815         dev = dev_get_drvdata(_dev);
1816         next = buf;
1817         size = PAGE_SIZE;
1818         spin_lock_irqsave(&dev->lock, flags);
1819
1820         for (i = 0; i < dev->n_ep; i++) {
1821                 struct net2280_ep               *ep = &dev->ep[i];
1822                 struct net2280_request          *req;
1823                 int                             t;
1824
1825                 if (i != 0) {
1826                         const struct usb_endpoint_descriptor    *d;
1827
1828                         d = ep->desc;
1829                         if (!d)
1830                                 continue;
1831                         t = d->bEndpointAddress;
1832                         t = scnprintf(next, size,
1833                                 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1834                                 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1835                                 (t & USB_DIR_IN) ? "in" : "out",
1836                                 type_string(d->bmAttributes),
1837                                 usb_endpoint_maxp(d),
1838                                 ep->dma ? "dma" : "pio", ep->fifo_size
1839                                 );
1840                 } else /* ep0 should only have one transfer queued */
1841                         t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1842                                         ep->is_in ? "in" : "out");
1843                 if (t <= 0 || t > size)
1844                         goto done;
1845                 size -= t;
1846                 next += t;
1847
1848                 if (list_empty(&ep->queue)) {
1849                         t = scnprintf(next, size, "\t(nothing queued)\n");
1850                         if (t <= 0 || t > size)
1851                                 goto done;
1852                         size -= t;
1853                         next += t;
1854                         continue;
1855                 }
1856                 list_for_each_entry(req, &ep->queue, queue) {
1857                         if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1858                                 t = scnprintf(next, size,
1859                                         "\treq %p len %d/%d "
1860                                         "buf %p (dmacount %08x)\n",
1861                                         &req->req, req->req.actual,
1862                                         req->req.length, req->req.buf,
1863                                         readl(&ep->dma->dmacount));
1864                         else
1865                                 t = scnprintf(next, size,
1866                                         "\treq %p len %d/%d buf %p\n",
1867                                         &req->req, req->req.actual,
1868                                         req->req.length, req->req.buf);
1869                         if (t <= 0 || t > size)
1870                                 goto done;
1871                         size -= t;
1872                         next += t;
1873
1874                         if (ep->dma) {
1875                                 struct net2280_dma      *td;
1876
1877                                 td = req->td;
1878                                 t = scnprintf(next, size, "\t    td %08x "
1879                                         " count %08x buf %08x desc %08x\n",
1880                                         (u32) req->td_dma,
1881                                         le32_to_cpu(td->dmacount),
1882                                         le32_to_cpu(td->dmaaddr),
1883                                         le32_to_cpu(td->dmadesc));
1884                                 if (t <= 0 || t > size)
1885                                         goto done;
1886                                 size -= t;
1887                                 next += t;
1888                         }
1889                 }
1890         }
1891
1892 done:
1893         spin_unlock_irqrestore(&dev->lock, flags);
1894         return PAGE_SIZE - size;
1895 }
1896 static DEVICE_ATTR_RO(queues);
1897
1898
1899 #else
1900
1901 #define device_create_file(a, b)        (0)
1902 #define device_remove_file(a, b)        do { } while (0)
1903
1904 #endif
1905
1906 /*-------------------------------------------------------------------------*/
1907
1908 /* another driver-specific mode might be a request type doing dma
1909  * to/from another device fifo instead of to/from memory.
1910  */
1911
1912 static void set_fifo_mode(struct net2280 *dev, int mode)
1913 {
1914         /* keeping high bits preserves BAR2 */
1915         writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1916
1917         /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1918         INIT_LIST_HEAD(&dev->gadget.ep_list);
1919         list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1920         list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1921         switch (mode) {
1922         case 0:
1923                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1924                 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1925                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1926                 break;
1927         case 1:
1928                 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1929                 break;
1930         case 2:
1931                 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1932                 dev->ep[1].fifo_size = 2048;
1933                 dev->ep[2].fifo_size = 1024;
1934                 break;
1935         }
1936         /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1937         list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1938         list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1939 }
1940
1941 static void defect7374_disable_data_eps(struct net2280 *dev)
1942 {
1943         /*
1944          * For Defect 7374, disable data EPs (and more):
1945          *  - This phase undoes the earlier phase of the Defect 7374 workaround,
1946          *    returing ep regs back to normal.
1947          */
1948         struct net2280_ep *ep;
1949         int i;
1950         unsigned char ep_sel;
1951         u32 tmp_reg;
1952
1953         for (i = 1; i < 5; i++) {
1954                 ep = &dev->ep[i];
1955                 writel(i, &ep->cfg->ep_cfg);
1956         }
1957
1958         /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1959         for (i = 0; i < 6; i++)
1960                 writel(0, &dev->dep[i].dep_cfg);
1961
1962         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1963                 /* Select an endpoint for subsequent operations: */
1964                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1965                 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1966
1967                 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1968                                         ep_sel == 18 || ep_sel == 20)
1969                         continue;
1970
1971                 /* Change settings on some selected endpoints */
1972                 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1973                 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1974                 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1975                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1976                 tmp_reg |= BIT(EP_INITIALIZED);
1977                 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1978         }
1979 }
1980
1981 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1982 {
1983         u32 tmp = 0, tmp_reg;
1984         u32 scratch;
1985         int i;
1986         unsigned char ep_sel;
1987
1988         scratch = get_idx_reg(dev->regs, SCRATCH);
1989
1990         WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1991                 == DEFECT7374_FSM_SS_CONTROL_READ);
1992
1993         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
1994
1995         ep_warn(dev, "Operate Defect 7374 workaround soft this time");
1996         ep_warn(dev, "It will operate on cold-reboot and SS connect");
1997
1998         /*GPEPs:*/
1999         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
2000                         (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
2001                         ((dev->enhanced_mode) ?
2002                          BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
2003                          BIT(ENDPOINT_ENABLE)));
2004
2005         for (i = 1; i < 5; i++)
2006                 writel(tmp, &dev->ep[i].cfg->ep_cfg);
2007
2008         /* CSRIN, PCIIN, STATIN, RCIN*/
2009         tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
2010         writel(tmp, &dev->dep[1].dep_cfg);
2011         writel(tmp, &dev->dep[3].dep_cfg);
2012         writel(tmp, &dev->dep[4].dep_cfg);
2013         writel(tmp, &dev->dep[5].dep_cfg);
2014
2015         /*Implemented for development and debug.
2016          * Can be refined/tuned later.*/
2017         for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
2018                 /* Select an endpoint for subsequent operations: */
2019                 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
2020                 writel(((tmp_reg & ~0x1f) | ep_sel),
2021                                 &dev->plregs->pl_ep_ctrl);
2022
2023                 if (ep_sel == 1) {
2024                         tmp =
2025                                 (readl(&dev->plregs->pl_ep_ctrl) |
2026                                  BIT(CLEAR_ACK_ERROR_CODE) | 0);
2027                         writel(tmp, &dev->plregs->pl_ep_ctrl);
2028                         continue;
2029                 }
2030
2031                 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
2032                                 ep_sel == 18  || ep_sel == 20)
2033                         continue;
2034
2035                 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
2036                                 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
2037                 writel(tmp, &dev->plregs->pl_ep_cfg_4);
2038
2039                 tmp = readl(&dev->plregs->pl_ep_ctrl) &
2040                         ~BIT(EP_INITIALIZED);
2041                 writel(tmp, &dev->plregs->pl_ep_ctrl);
2042
2043         }
2044
2045         /* Set FSM to focus on the first Control Read:
2046          * - Tip: Connection speed is known upon the first
2047          * setup request.*/
2048         scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
2049         set_idx_reg(dev->regs, SCRATCH, scratch);
2050
2051 }
2052
2053 /* keeping it simple:
2054  * - one bus driver, initted first;
2055  * - one function driver, initted second
2056  *
2057  * most of the work to support multiple net2280 controllers would
2058  * be to associate this gadget driver (yes?) with all of them, or
2059  * perhaps to bind specific drivers to specific devices.
2060  */
2061
2062 static void usb_reset_228x(struct net2280 *dev)
2063 {
2064         u32     tmp;
2065
2066         dev->gadget.speed = USB_SPEED_UNKNOWN;
2067         (void) readl(&dev->usb->usbctl);
2068
2069         net2280_led_init(dev);
2070
2071         /* disable automatic responses, and irqs */
2072         writel(0, &dev->usb->stdrsp);
2073         writel(0, &dev->regs->pciirqenb0);
2074         writel(0, &dev->regs->pciirqenb1);
2075
2076         /* clear old dma and irq state */
2077         for (tmp = 0; tmp < 4; tmp++) {
2078                 struct net2280_ep       *ep = &dev->ep[tmp + 1];
2079                 if (ep->dma)
2080                         abort_dma(ep);
2081         }
2082
2083         writel(~0, &dev->regs->irqstat0),
2084         writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
2085
2086         /* reset, and enable pci */
2087         tmp = readl(&dev->regs->devinit) |
2088                 BIT(PCI_ENABLE) |
2089                 BIT(FIFO_SOFT_RESET) |
2090                 BIT(USB_SOFT_RESET) |
2091                 BIT(M8051_RESET);
2092         writel(tmp, &dev->regs->devinit);
2093
2094         /* standard fifo and endpoint allocations */
2095         set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
2096 }
2097
2098 static void usb_reset_338x(struct net2280 *dev)
2099 {
2100         u32 tmp;
2101
2102         dev->gadget.speed = USB_SPEED_UNKNOWN;
2103         (void)readl(&dev->usb->usbctl);
2104
2105         net2280_led_init(dev);
2106
2107         if (dev->bug7734_patched) {
2108                 /* disable automatic responses, and irqs */
2109                 writel(0, &dev->usb->stdrsp);
2110                 writel(0, &dev->regs->pciirqenb0);
2111                 writel(0, &dev->regs->pciirqenb1);
2112         }
2113
2114         /* clear old dma and irq state */
2115         for (tmp = 0; tmp < 4; tmp++) {
2116                 struct net2280_ep *ep = &dev->ep[tmp + 1];
2117                 struct net2280_dma_regs __iomem *dma;
2118
2119                 if (ep->dma) {
2120                         abort_dma(ep);
2121                 } else {
2122                         dma = &dev->dma[tmp];
2123                         writel(BIT(DMA_ABORT), &dma->dmastat);
2124                         writel(0, &dma->dmactl);
2125                 }
2126         }
2127
2128         writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2129
2130         if (dev->bug7734_patched) {
2131                 /* reset, and enable pci */
2132                 tmp = readl(&dev->regs->devinit) |
2133                     BIT(PCI_ENABLE) |
2134                     BIT(FIFO_SOFT_RESET) |
2135                     BIT(USB_SOFT_RESET) |
2136                     BIT(M8051_RESET);
2137
2138                 writel(tmp, &dev->regs->devinit);
2139         }
2140
2141         /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2142         INIT_LIST_HEAD(&dev->gadget.ep_list);
2143
2144         for (tmp = 1; tmp < dev->n_ep; tmp++)
2145                 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2146
2147 }
2148
2149 static void usb_reset(struct net2280 *dev)
2150 {
2151         if (dev->quirks & PLX_LEGACY)
2152                 return usb_reset_228x(dev);
2153         return usb_reset_338x(dev);
2154 }
2155
2156 static void usb_reinit_228x(struct net2280 *dev)
2157 {
2158         u32     tmp;
2159
2160         /* basic endpoint init */
2161         for (tmp = 0; tmp < 7; tmp++) {
2162                 struct net2280_ep       *ep = &dev->ep[tmp];
2163
2164                 ep->ep.name = ep_info_dft[tmp].name;
2165                 ep->ep.caps = ep_info_dft[tmp].caps;
2166                 ep->dev = dev;
2167                 ep->num = tmp;
2168
2169                 if (tmp > 0 && tmp <= 4) {
2170                         ep->fifo_size = 1024;
2171                         ep->dma = &dev->dma[tmp - 1];
2172                 } else
2173                         ep->fifo_size = 64;
2174                 ep->regs = &dev->epregs[tmp];
2175                 ep->cfg = &dev->epregs[tmp];
2176                 ep_reset_228x(dev->regs, ep);
2177         }
2178         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2179         usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2180         usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2181
2182         dev->gadget.ep0 = &dev->ep[0].ep;
2183         dev->ep[0].stopped = 0;
2184         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2185
2186         /* we want to prevent lowlevel/insecure access from the USB host,
2187          * but erratum 0119 means this enable bit is ignored
2188          */
2189         for (tmp = 0; tmp < 5; tmp++)
2190                 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2191 }
2192
2193 static void usb_reinit_338x(struct net2280 *dev)
2194 {
2195         int i;
2196         u32 tmp, val;
2197         static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2198         static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2199                                                 0x00, 0xC0, 0x00, 0xC0 };
2200
2201         /* basic endpoint init */
2202         for (i = 0; i < dev->n_ep; i++) {
2203                 struct net2280_ep *ep = &dev->ep[i];
2204
2205                 ep->ep.name = dev->enhanced_mode ? ep_info_adv[i].name :
2206                                                    ep_info_dft[i].name;
2207                 ep->ep.caps = dev->enhanced_mode ? ep_info_adv[i].caps :
2208                                                    ep_info_dft[i].caps;
2209                 ep->dev = dev;
2210                 ep->num = i;
2211
2212                 if (i > 0 && i <= 4)
2213                         ep->dma = &dev->dma[i - 1];
2214
2215                 if (dev->enhanced_mode) {
2216                         ep->cfg = &dev->epregs[ne[i]];
2217                         /*
2218                          * Set USB endpoint number, hardware allows same number
2219                          * in both directions.
2220                          */
2221                          if (i > 0 && i < 5)
2222                                 writel(ne[i], &ep->cfg->ep_cfg);
2223                         ep->regs = (struct net2280_ep_regs __iomem *)
2224                                 (((void __iomem *)&dev->epregs[ne[i]]) +
2225                                 ep_reg_addr[i]);
2226                 } else {
2227                         ep->cfg = &dev->epregs[i];
2228                         ep->regs = &dev->epregs[i];
2229                 }
2230
2231                 ep->fifo_size = (i != 0) ? 2048 : 512;
2232
2233                 ep_reset_338x(dev->regs, ep);
2234         }
2235         usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2236
2237         dev->gadget.ep0 = &dev->ep[0].ep;
2238         dev->ep[0].stopped = 0;
2239
2240         /* Link layer set up */
2241         if (dev->bug7734_patched) {
2242                 tmp = readl(&dev->usb_ext->usbctl2) &
2243                     ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2244                 writel(tmp, &dev->usb_ext->usbctl2);
2245         }
2246
2247         /* Hardware Defect and Workaround */
2248         val = readl(&dev->llregs->ll_lfps_5);
2249         val &= ~(0xf << TIMER_LFPS_6US);
2250         val |= 0x5 << TIMER_LFPS_6US;
2251         writel(val, &dev->llregs->ll_lfps_5);
2252
2253         val = readl(&dev->llregs->ll_lfps_6);
2254         val &= ~(0xffff << TIMER_LFPS_80US);
2255         val |= 0x0100 << TIMER_LFPS_80US;
2256         writel(val, &dev->llregs->ll_lfps_6);
2257
2258         /*
2259          * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2260          * Hot Reset Exit Handshake may Fail in Specific Case using
2261          * Default Register Settings. Workaround for Enumeration test.
2262          */
2263         val = readl(&dev->llregs->ll_tsn_counters_2);
2264         val &= ~(0x1f << HOT_TX_NORESET_TS2);
2265         val |= 0x10 << HOT_TX_NORESET_TS2;
2266         writel(val, &dev->llregs->ll_tsn_counters_2);
2267
2268         val = readl(&dev->llregs->ll_tsn_counters_3);
2269         val &= ~(0x1f << HOT_RX_RESET_TS2);
2270         val |= 0x3 << HOT_RX_RESET_TS2;
2271         writel(val, &dev->llregs->ll_tsn_counters_3);
2272
2273         /*
2274          * AB errata. Errata 11. Workaround for Default Duration of LFPS
2275          * Handshake Signaling for Device-Initiated U1 Exit is too short.
2276          * Without this, various enumeration failures observed with
2277          * modern superspeed hosts.
2278          */
2279         val = readl(&dev->llregs->ll_lfps_timers_2);
2280         writel((val & 0xffff0000) | LFPS_TIMERS_2_WORKAROUND_VALUE,
2281                &dev->llregs->ll_lfps_timers_2);
2282
2283         /*
2284          * Set Recovery Idle to Recover bit:
2285          * - On SS connections, setting Recovery Idle to Recover Fmw improves
2286          *   link robustness with various hosts and hubs.
2287          * - It is safe to set for all connection speeds; all chip revisions.
2288          * - R-M-W to leave other bits undisturbed.
2289          * - Reference PLX TT-7372
2290         */
2291         val = readl(&dev->llregs->ll_tsn_chicken_bit);
2292         val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2293         writel(val, &dev->llregs->ll_tsn_chicken_bit);
2294
2295         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2296
2297         /* disable dedicated endpoints */
2298         writel(0x0D, &dev->dep[0].dep_cfg);
2299         writel(0x0D, &dev->dep[1].dep_cfg);
2300         writel(0x0E, &dev->dep[2].dep_cfg);
2301         writel(0x0E, &dev->dep[3].dep_cfg);
2302         writel(0x0F, &dev->dep[4].dep_cfg);
2303         writel(0x0C, &dev->dep[5].dep_cfg);
2304 }
2305
2306 static void usb_reinit(struct net2280 *dev)
2307 {
2308         if (dev->quirks & PLX_LEGACY)
2309                 return usb_reinit_228x(dev);
2310         return usb_reinit_338x(dev);
2311 }
2312
2313 static void ep0_start_228x(struct net2280 *dev)
2314 {
2315         writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2316                 BIT(CLEAR_NAK_OUT_PACKETS) |
2317                 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2318                 &dev->epregs[0].ep_rsp);
2319
2320         /*
2321          * hardware optionally handles a bunch of standard requests
2322          * that the API hides from drivers anyway.  have it do so.
2323          * endpoint status/features are handled in software, to
2324          * help pass tests for some dubious behavior.
2325          */
2326         writel(BIT(SET_TEST_MODE) |
2327                 BIT(SET_ADDRESS) |
2328                 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2329                 BIT(GET_DEVICE_STATUS) |
2330                 BIT(GET_INTERFACE_STATUS),
2331                 &dev->usb->stdrsp);
2332         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2333                 BIT(SELF_POWERED_USB_DEVICE) |
2334                 BIT(REMOTE_WAKEUP_SUPPORT) |
2335                 (dev->softconnect << USB_DETECT_ENABLE) |
2336                 BIT(SELF_POWERED_STATUS),
2337                 &dev->usb->usbctl);
2338
2339         /* enable irqs so we can see ep0 and general operation  */
2340         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2341                 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2342                 &dev->regs->pciirqenb0);
2343         writel(BIT(PCI_INTERRUPT_ENABLE) |
2344                 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2345                 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2346                 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2347                 BIT(VBUS_INTERRUPT_ENABLE) |
2348                 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2349                 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2350                 &dev->regs->pciirqenb1);
2351
2352         /* don't leave any writes posted */
2353         (void) readl(&dev->usb->usbctl);
2354 }
2355
2356 static void ep0_start_338x(struct net2280 *dev)
2357 {
2358
2359         if (dev->bug7734_patched)
2360                 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2361                        BIT(SET_EP_HIDE_STATUS_PHASE),
2362                        &dev->epregs[0].ep_rsp);
2363
2364         /*
2365          * hardware optionally handles a bunch of standard requests
2366          * that the API hides from drivers anyway.  have it do so.
2367          * endpoint status/features are handled in software, to
2368          * help pass tests for some dubious behavior.
2369          */
2370         writel(BIT(SET_ISOCHRONOUS_DELAY) |
2371                BIT(SET_SEL) |
2372                BIT(SET_TEST_MODE) |
2373                BIT(SET_ADDRESS) |
2374                BIT(GET_INTERFACE_STATUS) |
2375                BIT(GET_DEVICE_STATUS),
2376                 &dev->usb->stdrsp);
2377         dev->wakeup_enable = 1;
2378         writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2379                (dev->softconnect << USB_DETECT_ENABLE) |
2380                BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2381                &dev->usb->usbctl);
2382
2383         /* enable irqs so we can see ep0 and general operation  */
2384         writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2385                BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2386                &dev->regs->pciirqenb0);
2387         writel(BIT(PCI_INTERRUPT_ENABLE) |
2388                BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2389                BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2390                BIT(VBUS_INTERRUPT_ENABLE),
2391                &dev->regs->pciirqenb1);
2392
2393         /* don't leave any writes posted */
2394         (void)readl(&dev->usb->usbctl);
2395 }
2396
2397 static void ep0_start(struct net2280 *dev)
2398 {
2399         if (dev->quirks & PLX_LEGACY)
2400                 return ep0_start_228x(dev);
2401         return ep0_start_338x(dev);
2402 }
2403
2404 /* when a driver is successfully registered, it will receive
2405  * control requests including set_configuration(), which enables
2406  * non-control requests.  then usb traffic follows until a
2407  * disconnect is reported.  then a host may connect again, or
2408  * the driver might get unbound.
2409  */
2410 static int net2280_start(struct usb_gadget *_gadget,
2411                 struct usb_gadget_driver *driver)
2412 {
2413         struct net2280          *dev;
2414         int                     retval;
2415         unsigned                i;
2416
2417         /* insist on high speed support from the driver, since
2418          * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2419          * "must not be used in normal operation"
2420          */
2421         if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2422                         !driver->setup)
2423                 return -EINVAL;
2424
2425         dev = container_of(_gadget, struct net2280, gadget);
2426
2427         for (i = 0; i < dev->n_ep; i++)
2428                 dev->ep[i].irqs = 0;
2429
2430         /* hook up the driver ... */
2431         driver->driver.bus = NULL;
2432         dev->driver = driver;
2433
2434         retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2435         if (retval)
2436                 goto err_unbind;
2437         retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2438         if (retval)
2439                 goto err_func;
2440
2441         /* enable host detection and ep0; and we're ready
2442          * for set_configuration as well as eventual disconnect.
2443          */
2444         net2280_led_active(dev, 1);
2445
2446         if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
2447                 defect7374_enable_data_eps_zero(dev);
2448
2449         ep0_start(dev);
2450
2451         /* pci writes may still be posted */
2452         return 0;
2453
2454 err_func:
2455         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2456 err_unbind:
2457         dev->driver = NULL;
2458         return retval;
2459 }
2460
2461 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2462 {
2463         int                     i;
2464
2465         /* don't disconnect if it's not connected */
2466         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2467                 driver = NULL;
2468
2469         /* stop hardware; prevent new request submissions;
2470          * and kill any outstanding requests.
2471          */
2472         usb_reset(dev);
2473         for (i = 0; i < dev->n_ep; i++)
2474                 nuke(&dev->ep[i]);
2475
2476         /* report disconnect; the driver is already quiesced */
2477         if (dev->async_callbacks && driver) {
2478                 spin_unlock(&dev->lock);
2479                 driver->disconnect(&dev->gadget);
2480                 spin_lock(&dev->lock);
2481         }
2482
2483         usb_reinit(dev);
2484 }
2485
2486 static int net2280_stop(struct usb_gadget *_gadget)
2487 {
2488         struct net2280  *dev;
2489         unsigned long   flags;
2490
2491         dev = container_of(_gadget, struct net2280, gadget);
2492
2493         spin_lock_irqsave(&dev->lock, flags);
2494         stop_activity(dev, NULL);
2495         spin_unlock_irqrestore(&dev->lock, flags);
2496
2497         net2280_led_active(dev, 0);
2498
2499         device_remove_file(&dev->pdev->dev, &dev_attr_function);
2500         device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2501
2502         dev->driver = NULL;
2503
2504         return 0;
2505 }
2506
2507 static void net2280_async_callbacks(struct usb_gadget *_gadget, bool enable)
2508 {
2509         struct net2280  *dev = container_of(_gadget, struct net2280, gadget);
2510
2511         spin_lock_irq(&dev->lock);
2512         dev->async_callbacks = enable;
2513         spin_unlock_irq(&dev->lock);
2514 }
2515
2516 /*-------------------------------------------------------------------------*/
2517
2518 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2519  * also works for dma-capable endpoints, in pio mode or just
2520  * to manually advance the queue after short OUT transfers.
2521  */
2522 static void handle_ep_small(struct net2280_ep *ep)
2523 {
2524         struct net2280_request  *req;
2525         u32                     t;
2526         /* 0 error, 1 mid-data, 2 done */
2527         int                     mode = 1;
2528
2529         if (!list_empty(&ep->queue))
2530                 req = list_entry(ep->queue.next,
2531                         struct net2280_request, queue);
2532         else
2533                 req = NULL;
2534
2535         /* ack all, and handle what we care about */
2536         t = readl(&ep->regs->ep_stat);
2537         ep->irqs++;
2538
2539         ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2540                         ep->ep.name, t, req ? &req->req : NULL);
2541
2542         if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2543                 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2544         else
2545                 /* Added for 2282 */
2546                 writel(t, &ep->regs->ep_stat);
2547
2548         /* for ep0, monitor token irqs to catch data stage length errors
2549          * and to synchronize on status.
2550          *
2551          * also, to defer reporting of protocol stalls ... here's where
2552          * data or status first appears, handling stalls here should never
2553          * cause trouble on the host side..
2554          *
2555          * control requests could be slightly faster without token synch for
2556          * status, but status can jam up that way.
2557          */
2558         if (unlikely(ep->num == 0)) {
2559                 if (ep->is_in) {
2560                         /* status; stop NAKing */
2561                         if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2562                                 if (ep->dev->protocol_stall) {
2563                                         ep->stopped = 1;
2564                                         set_halt(ep);
2565                                 }
2566                                 if (!req)
2567                                         allow_status(ep);
2568                                 mode = 2;
2569                         /* reply to extra IN data tokens with a zlp */
2570                         } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2571                                 if (ep->dev->protocol_stall) {
2572                                         ep->stopped = 1;
2573                                         set_halt(ep);
2574                                         mode = 2;
2575                                 } else if (ep->responded &&
2576                                                 !req && !ep->stopped)
2577                                         write_fifo(ep, NULL);
2578                         }
2579                 } else {
2580                         /* status; stop NAKing */
2581                         if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2582                                 if (ep->dev->protocol_stall) {
2583                                         ep->stopped = 1;
2584                                         set_halt(ep);
2585                                 }
2586                                 mode = 2;
2587                         /* an extra OUT token is an error */
2588                         } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2589                                         req &&
2590                                         req->req.actual == req->req.length) ||
2591                                         (ep->responded && !req)) {
2592                                 ep->dev->protocol_stall = 1;
2593                                 set_halt(ep);
2594                                 ep->stopped = 1;
2595                                 if (req)
2596                                         done(ep, req, -EOVERFLOW);
2597                                 req = NULL;
2598                         }
2599                 }
2600         }
2601
2602         if (unlikely(!req))
2603                 return;
2604
2605         /* manual DMA queue advance after short OUT */
2606         if (likely(ep->dma)) {
2607                 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2608                         struct net2280_request *stuck_req = NULL;
2609                         int     stopped = ep->stopped;
2610                         int     num_completed;
2611                         int     stuck = 0;
2612                         u32     count;
2613
2614                         /* TRANSFERRED works around OUT_DONE erratum 0112.
2615                          * we expect (N <= maxpacket) bytes; host wrote M.
2616                          * iff (M < N) we won't ever see a DMA interrupt.
2617                          */
2618                         ep->stopped = 1;
2619                         for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2620
2621                                 /* any preceding dma transfers must finish.
2622                                  * dma handles (M >= N), may empty the queue
2623                                  */
2624                                 num_completed = scan_dma_completions(ep);
2625                                 if (unlikely(list_empty(&ep->queue) ||
2626                                                 ep->out_overflow)) {
2627                                         req = NULL;
2628                                         break;
2629                                 }
2630                                 req = list_entry(ep->queue.next,
2631                                         struct net2280_request, queue);
2632
2633                                 /* here either (M < N), a "real" short rx;
2634                                  * or (M == N) and the queue didn't empty
2635                                  */
2636                                 if (likely(t & BIT(FIFO_EMPTY))) {
2637                                         count = readl(&ep->dma->dmacount);
2638                                         count &= DMA_BYTE_COUNT_MASK;
2639                                         if (readl(&ep->dma->dmadesc)
2640                                                         != req->td_dma)
2641                                                 req = NULL;
2642                                         break;
2643                                 }
2644
2645                                 /* Escape loop if no dma transfers completed
2646                                  * after few retries.
2647                                  */
2648                                 if (num_completed == 0) {
2649                                         if (stuck_req == req &&
2650                                             readl(&ep->dma->dmadesc) !=
2651                                                   req->td_dma && stuck++ > 5) {
2652                                                 count = readl(
2653                                                         &ep->dma->dmacount);
2654                                                 count &= DMA_BYTE_COUNT_MASK;
2655                                                 req = NULL;
2656                                                 ep_dbg(ep->dev, "%s escape stuck %d, count %u\n",
2657                                                         ep->ep.name, stuck,
2658                                                         count);
2659                                                 break;
2660                                         } else if (stuck_req != req) {
2661                                                 stuck_req = req;
2662                                                 stuck = 0;
2663                                         }
2664                                 } else {
2665                                         stuck_req = NULL;
2666                                         stuck = 0;
2667                                 }
2668
2669                                 udelay(1);
2670                         }
2671
2672                         /* stop DMA, leave ep NAKing */
2673                         writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2674                         spin_stop_dma(ep->dma);
2675
2676                         if (likely(req)) {
2677                                 req->td->dmacount = 0;
2678                                 t = readl(&ep->regs->ep_avail);
2679                                 dma_done(ep, req, count,
2680                                         (ep->out_overflow || t)
2681                                                 ? -EOVERFLOW : 0);
2682                         }
2683
2684                         /* also flush to prevent erratum 0106 trouble */
2685                         if (unlikely(ep->out_overflow ||
2686                                         (ep->dev->chiprev == 0x0100 &&
2687                                         ep->dev->gadget.speed
2688                                         == USB_SPEED_FULL))) {
2689                                 out_flush(ep);
2690                                 ep->out_overflow = 0;
2691                         }
2692
2693                         /* (re)start dma if needed, stop NAKing */
2694                         ep->stopped = stopped;
2695                         if (!list_empty(&ep->queue))
2696                                 restart_dma(ep);
2697                 } else
2698                         ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2699                                         ep->ep.name, t);
2700                 return;
2701
2702         /* data packet(s) received (in the fifo, OUT) */
2703         } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2704                 if (read_fifo(ep, req) && ep->num != 0)
2705                         mode = 2;
2706
2707         /* data packet(s) transmitted (IN) */
2708         } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2709                 unsigned        len;
2710
2711                 len = req->req.length - req->req.actual;
2712                 if (len > ep->ep.maxpacket)
2713                         len = ep->ep.maxpacket;
2714                 req->req.actual += len;
2715
2716                 /* if we wrote it all, we're usually done */
2717                 /* send zlps until the status stage */
2718                 if ((req->req.actual == req->req.length) &&
2719                         (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2720                                 mode = 2;
2721
2722         /* there was nothing to do ...  */
2723         } else if (mode == 1)
2724                 return;
2725
2726         /* done */
2727         if (mode == 2) {
2728                 /* stream endpoints often resubmit/unlink in completion */
2729                 done(ep, req, 0);
2730
2731                 /* maybe advance queue to next request */
2732                 if (ep->num == 0) {
2733                         /* NOTE:  net2280 could let gadget driver start the
2734                          * status stage later. since not all controllers let
2735                          * them control that, the api doesn't (yet) allow it.
2736                          */
2737                         if (!ep->stopped)
2738                                 allow_status(ep);
2739                         req = NULL;
2740                 } else {
2741                         if (!list_empty(&ep->queue) && !ep->stopped)
2742                                 req = list_entry(ep->queue.next,
2743                                         struct net2280_request, queue);
2744                         else
2745                                 req = NULL;
2746                         if (req && !ep->is_in)
2747                                 stop_out_naking(ep);
2748                 }
2749         }
2750
2751         /* is there a buffer for the next packet?
2752          * for best streaming performance, make sure there is one.
2753          */
2754         if (req && !ep->stopped) {
2755
2756                 /* load IN fifo with next packet (may be zlp) */
2757                 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2758                         write_fifo(ep, &req->req);
2759         }
2760 }
2761
2762 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2763 {
2764         struct net2280_ep       *ep;
2765
2766         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2767                 return &dev->ep[0];
2768         list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2769                 u8      bEndpointAddress;
2770
2771                 if (!ep->desc)
2772                         continue;
2773                 bEndpointAddress = ep->desc->bEndpointAddress;
2774                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2775                         continue;
2776                 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2777                         return ep;
2778         }
2779         return NULL;
2780 }
2781
2782 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2783 {
2784         u32 scratch, fsmvalue;
2785         u32 ack_wait_timeout, state;
2786
2787         /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2788         scratch = get_idx_reg(dev->regs, SCRATCH);
2789         fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2790         scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2791
2792         if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2793                                 (r.bRequestType & USB_DIR_IN)))
2794                 return;
2795
2796         /* This is the first Control Read for this connection: */
2797         if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2798                 /*
2799                  * Connection is NOT SS:
2800                  * - Connection must be FS or HS.
2801                  * - This FSM state should allow workaround software to
2802                  * run after the next USB connection.
2803                  */
2804                 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2805                 dev->bug7734_patched = 1;
2806                 goto restore_data_eps;
2807         }
2808
2809         /* Connection is SS: */
2810         for (ack_wait_timeout = 0;
2811                         ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2812                         ack_wait_timeout++) {
2813
2814                 state = readl(&dev->plregs->pl_ep_status_1)
2815                         & (0xff << STATE);
2816                 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2817                         (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2818                         scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2819                         dev->bug7734_patched = 1;
2820                         break;
2821                 }
2822
2823                 /*
2824                  * We have not yet received host's Data Phase ACK
2825                  * - Wait and try again.
2826                  */
2827                 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2828         }
2829
2830
2831         if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2832                 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2833                 "to detect SS host's data phase ACK.");
2834                 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2835                 "got 0x%2.2x.\n", state >> STATE);
2836         } else {
2837                 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2838                 "%duSec for Control Read Data Phase ACK\n",
2839                         DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2840         }
2841
2842 restore_data_eps:
2843         /*
2844          * Restore data EPs to their pre-workaround settings (disabled,
2845          * initialized, and other details).
2846          */
2847         defect7374_disable_data_eps(dev);
2848
2849         set_idx_reg(dev->regs, SCRATCH, scratch);
2850
2851         return;
2852 }
2853
2854 static void ep_clear_seqnum(struct net2280_ep *ep)
2855 {
2856         struct net2280 *dev = ep->dev;
2857         u32 val;
2858         static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2859
2860         val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2861         val |= ep_pl[ep->num];
2862         writel(val, &dev->plregs->pl_ep_ctrl);
2863         val |= BIT(SEQUENCE_NUMBER_RESET);
2864         writel(val, &dev->plregs->pl_ep_ctrl);
2865
2866         return;
2867 }
2868
2869 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2870                 struct net2280_ep *ep, struct usb_ctrlrequest r)
2871 {
2872         struct net2280_ep *e;
2873         u16 status;
2874         int tmp = 0;
2875
2876 #define w_value         le16_to_cpu(r.wValue)
2877 #define w_index         le16_to_cpu(r.wIndex)
2878 #define w_length        le16_to_cpu(r.wLength)
2879
2880         switch (r.bRequest) {
2881         case USB_REQ_SET_CONFIGURATION:
2882                 dev->addressed_state = !w_value;
2883                 goto usb3_delegate;
2884
2885         case USB_REQ_GET_STATUS:
2886                 switch (r.bRequestType) {
2887                 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2888                         status = dev->wakeup_enable ? 0x02 : 0x00;
2889                         if (dev->gadget.is_selfpowered)
2890                                 status |= BIT(0);
2891                         status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2892                                                         dev->ltm_enable << 4);
2893                         writel(0, &dev->epregs[0].ep_irqenb);
2894                         set_fifo_bytecount(ep, sizeof(status));
2895                         writel((__force u32) status, &dev->epregs[0].ep_data);
2896                         allow_status_338x(ep);
2897                         break;
2898
2899                 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2900                         e = get_ep_by_addr(dev, w_index);
2901                         if (!e)
2902                                 goto do_stall3;
2903                         status = readl(&e->regs->ep_rsp) &
2904                                                 BIT(CLEAR_ENDPOINT_HALT);
2905                         writel(0, &dev->epregs[0].ep_irqenb);
2906                         set_fifo_bytecount(ep, sizeof(status));
2907                         writel((__force u32) status, &dev->epregs[0].ep_data);
2908                         allow_status_338x(ep);
2909                         break;
2910
2911                 default:
2912                         goto usb3_delegate;
2913                 }
2914                 break;
2915
2916         case USB_REQ_CLEAR_FEATURE:
2917                 switch (r.bRequestType) {
2918                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2919                         if (!dev->addressed_state) {
2920                                 switch (w_value) {
2921                                 case USB_DEVICE_U1_ENABLE:
2922                                         dev->u1_enable = 0;
2923                                         writel(readl(&dev->usb_ext->usbctl2) &
2924                                                 ~BIT(U1_ENABLE),
2925                                                 &dev->usb_ext->usbctl2);
2926                                         allow_status_338x(ep);
2927                                         goto next_endpoints3;
2928
2929                                 case USB_DEVICE_U2_ENABLE:
2930                                         dev->u2_enable = 0;
2931                                         writel(readl(&dev->usb_ext->usbctl2) &
2932                                                 ~BIT(U2_ENABLE),
2933                                                 &dev->usb_ext->usbctl2);
2934                                         allow_status_338x(ep);
2935                                         goto next_endpoints3;
2936
2937                                 case USB_DEVICE_LTM_ENABLE:
2938                                         dev->ltm_enable = 0;
2939                                         writel(readl(&dev->usb_ext->usbctl2) &
2940                                                 ~BIT(LTM_ENABLE),
2941                                                 &dev->usb_ext->usbctl2);
2942                                         allow_status_338x(ep);
2943                                         goto next_endpoints3;
2944
2945                                 default:
2946                                         break;
2947                                 }
2948                         }
2949                         if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2950                                 dev->wakeup_enable = 0;
2951                                 writel(readl(&dev->usb->usbctl) &
2952                                         ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2953                                         &dev->usb->usbctl);
2954                                 allow_status_338x(ep);
2955                                 break;
2956                         }
2957                         goto usb3_delegate;
2958
2959                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2960                         e = get_ep_by_addr(dev, w_index);
2961                         if (!e)
2962                                 goto do_stall3;
2963                         if (w_value != USB_ENDPOINT_HALT)
2964                                 goto do_stall3;
2965                         ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2966                         /*
2967                          * Workaround for SS SeqNum not cleared via
2968                          * Endpoint Halt (Clear) bit. select endpoint
2969                          */
2970                         ep_clear_seqnum(e);
2971                         clear_halt(e);
2972                         if (!list_empty(&e->queue) && e->td_dma)
2973                                 restart_dma(e);
2974                         allow_status(ep);
2975                         ep->stopped = 1;
2976                         break;
2977
2978                 default:
2979                         goto usb3_delegate;
2980                 }
2981                 break;
2982         case USB_REQ_SET_FEATURE:
2983                 switch (r.bRequestType) {
2984                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2985                         if (!dev->addressed_state) {
2986                                 switch (w_value) {
2987                                 case USB_DEVICE_U1_ENABLE:
2988                                         dev->u1_enable = 1;
2989                                         writel(readl(&dev->usb_ext->usbctl2) |
2990                                                 BIT(U1_ENABLE),
2991                                                 &dev->usb_ext->usbctl2);
2992                                         allow_status_338x(ep);
2993                                         goto next_endpoints3;
2994
2995                                 case USB_DEVICE_U2_ENABLE:
2996                                         dev->u2_enable = 1;
2997                                         writel(readl(&dev->usb_ext->usbctl2) |
2998                                                 BIT(U2_ENABLE),
2999                                                 &dev->usb_ext->usbctl2);
3000                                         allow_status_338x(ep);
3001                                         goto next_endpoints3;
3002
3003                                 case USB_DEVICE_LTM_ENABLE:
3004                                         dev->ltm_enable = 1;
3005                                         writel(readl(&dev->usb_ext->usbctl2) |
3006                                                 BIT(LTM_ENABLE),
3007                                                 &dev->usb_ext->usbctl2);
3008                                         allow_status_338x(ep);
3009                                         goto next_endpoints3;
3010                                 default:
3011                                         break;
3012                                 }
3013                         }
3014
3015                         if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
3016                                 dev->wakeup_enable = 1;
3017                                 writel(readl(&dev->usb->usbctl) |
3018                                         BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
3019                                         &dev->usb->usbctl);
3020                                 allow_status_338x(ep);
3021                                 break;
3022                         }
3023                         goto usb3_delegate;
3024
3025                 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
3026                         e = get_ep_by_addr(dev, w_index);
3027                         if (!e || (w_value != USB_ENDPOINT_HALT))
3028                                 goto do_stall3;
3029                         ep->stopped = 1;
3030                         if (ep->num == 0)
3031                                 ep->dev->protocol_stall = 1;
3032                         else {
3033                                 if (ep->dma)
3034                                         abort_dma(ep);
3035                                 set_halt(ep);
3036                         }
3037                         allow_status_338x(ep);
3038                         break;
3039
3040                 default:
3041                         goto usb3_delegate;
3042                 }
3043
3044                 break;
3045         default:
3046
3047 usb3_delegate:
3048                 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
3049                                 r.bRequestType, r.bRequest,
3050                                 w_value, w_index, w_length,
3051                                 readl(&ep->cfg->ep_cfg));
3052
3053                 ep->responded = 0;
3054                 if (dev->async_callbacks) {
3055                         spin_unlock(&dev->lock);
3056                         tmp = dev->driver->setup(&dev->gadget, &r);
3057                         spin_lock(&dev->lock);
3058                 }
3059         }
3060 do_stall3:
3061         if (tmp < 0) {
3062                 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3063                                 r.bRequestType, r.bRequest, tmp);
3064                 dev->protocol_stall = 1;
3065                 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
3066                 set_halt(ep);
3067         }
3068
3069 next_endpoints3:
3070
3071 #undef  w_value
3072 #undef  w_index
3073 #undef  w_length
3074
3075         return;
3076 }
3077
3078 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
3079 {
3080         u32 index;
3081         u32 bit;
3082
3083         for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
3084                 bit = BIT(ep_bit[index]);
3085
3086                 if (!stat0)
3087                         break;
3088
3089                 if (!(stat0 & bit))
3090                         continue;
3091
3092                 stat0 &= ~bit;
3093
3094                 handle_ep_small(&dev->ep[index]);
3095         }
3096 }
3097
3098 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
3099 {
3100         struct net2280_ep       *ep;
3101         u32                     num, scratch;
3102
3103         /* most of these don't need individual acks */
3104         stat &= ~BIT(INTA_ASSERTED);
3105         if (!stat)
3106                 return;
3107         /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
3108
3109         /* starting a control request? */
3110         if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
3111                 union {
3112                         u32                     raw[2];
3113                         struct usb_ctrlrequest  r;
3114                 } u;
3115                 int                             tmp;
3116                 struct net2280_request          *req;
3117
3118                 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
3119                         u32 val = readl(&dev->usb->usbstat);
3120                         if (val & BIT(SUPER_SPEED)) {
3121                                 dev->gadget.speed = USB_SPEED_SUPER;
3122                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3123                                                 EP0_SS_MAX_PACKET_SIZE);
3124                         } else if (val & BIT(HIGH_SPEED)) {
3125                                 dev->gadget.speed = USB_SPEED_HIGH;
3126                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3127                                                 EP0_HS_MAX_PACKET_SIZE);
3128                         } else {
3129                                 dev->gadget.speed = USB_SPEED_FULL;
3130                                 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
3131                                                 EP0_HS_MAX_PACKET_SIZE);
3132                         }
3133                         net2280_led_speed(dev, dev->gadget.speed);
3134                         ep_dbg(dev, "%s\n",
3135                                         usb_speed_string(dev->gadget.speed));
3136                 }
3137
3138                 ep = &dev->ep[0];
3139                 ep->irqs++;
3140
3141                 /* make sure any leftover request state is cleared */
3142                 stat &= ~BIT(ENDPOINT_0_INTERRUPT);
3143                 while (!list_empty(&ep->queue)) {
3144                         req = list_entry(ep->queue.next,
3145                                         struct net2280_request, queue);
3146                         done(ep, req, (req->req.actual == req->req.length)
3147                                                 ? 0 : -EPROTO);
3148                 }
3149                 ep->stopped = 0;
3150                 dev->protocol_stall = 0;
3151                 if (!(dev->quirks & PLX_PCIE)) {
3152                         if (ep->dev->quirks & PLX_2280)
3153                                 tmp = BIT(FIFO_OVERFLOW) |
3154                                     BIT(FIFO_UNDERFLOW);
3155                         else
3156                                 tmp = 0;
3157
3158                         writel(tmp | BIT(TIMEOUT) |
3159                                    BIT(USB_STALL_SENT) |
3160                                    BIT(USB_IN_NAK_SENT) |
3161                                    BIT(USB_IN_ACK_RCVD) |
3162                                    BIT(USB_OUT_PING_NAK_SENT) |
3163                                    BIT(USB_OUT_ACK_SENT) |
3164                                    BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3165                                    BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3166                                    BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3167                                    BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3168                                    BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3169                                    BIT(DATA_IN_TOKEN_INTERRUPT),
3170                                    &ep->regs->ep_stat);
3171                 }
3172                 u.raw[0] = readl(&dev->usb->setup0123);
3173                 u.raw[1] = readl(&dev->usb->setup4567);
3174
3175                 cpu_to_le32s(&u.raw[0]);
3176                 cpu_to_le32s(&u.raw[1]);
3177
3178                 if ((dev->quirks & PLX_PCIE) && !dev->bug7734_patched)
3179                         defect7374_workaround(dev, u.r);
3180
3181                 tmp = 0;
3182
3183 #define w_value         le16_to_cpu(u.r.wValue)
3184 #define w_index         le16_to_cpu(u.r.wIndex)
3185 #define w_length        le16_to_cpu(u.r.wLength)
3186
3187                 /* ack the irq */
3188                 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3189                 stat ^= BIT(SETUP_PACKET_INTERRUPT);
3190
3191                 /* watch control traffic at the token level, and force
3192                  * synchronization before letting the status stage happen.
3193                  * FIXME ignore tokens we'll NAK, until driver responds.
3194                  * that'll mean a lot less irqs for some drivers.
3195                  */
3196                 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3197                 if (ep->is_in) {
3198                         scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3199                                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3200                                 BIT(DATA_IN_TOKEN_INTERRUPT);
3201                         stop_out_naking(ep);
3202                 } else
3203                         scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3204                                 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3205                                 BIT(DATA_IN_TOKEN_INTERRUPT);
3206                 writel(scratch, &dev->epregs[0].ep_irqenb);
3207
3208                 /* we made the hardware handle most lowlevel requests;
3209                  * everything else goes uplevel to the gadget code.
3210                  */
3211                 ep->responded = 1;
3212
3213                 if (dev->gadget.speed == USB_SPEED_SUPER) {
3214                         handle_stat0_irqs_superspeed(dev, ep, u.r);
3215                         goto next_endpoints;
3216                 }
3217
3218                 switch (u.r.bRequest) {
3219                 case USB_REQ_GET_STATUS: {
3220                         struct net2280_ep       *e;
3221                         __le32                  status;
3222
3223                         /* hw handles device and interface status */
3224                         if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3225                                 goto delegate;
3226                         e = get_ep_by_addr(dev, w_index);
3227                         if (!e || w_length > 2)
3228                                 goto do_stall;
3229
3230                         if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3231                                 status = cpu_to_le32(1);
3232                         else
3233                                 status = cpu_to_le32(0);
3234
3235                         /* don't bother with a request object! */
3236                         writel(0, &dev->epregs[0].ep_irqenb);
3237                         set_fifo_bytecount(ep, w_length);
3238                         writel((__force u32)status, &dev->epregs[0].ep_data);
3239                         allow_status(ep);
3240                         ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3241                         goto next_endpoints;
3242                         }
3243                         break;
3244                 case USB_REQ_CLEAR_FEATURE: {
3245                         struct net2280_ep       *e;
3246
3247                         /* hw handles device features */
3248                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3249                                 goto delegate;
3250                         if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3251                                 goto do_stall;
3252                         e = get_ep_by_addr(dev, w_index);
3253                         if (!e)
3254                                 goto do_stall;
3255                         if (e->wedged) {
3256                                 ep_vdbg(dev, "%s wedged, halt not cleared\n",
3257                                                 ep->ep.name);
3258                         } else {
3259                                 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3260                                 clear_halt(e);
3261                                 if ((ep->dev->quirks & PLX_PCIE) &&
3262                                         !list_empty(&e->queue) && e->td_dma)
3263                                                 restart_dma(e);
3264                         }
3265                         allow_status(ep);
3266                         goto next_endpoints;
3267                         }
3268                         break;
3269                 case USB_REQ_SET_FEATURE: {
3270                         struct net2280_ep       *e;
3271
3272                         /* hw handles device features */
3273                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3274                                 goto delegate;
3275                         if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3276                                 goto do_stall;
3277                         e = get_ep_by_addr(dev, w_index);
3278                         if (!e)
3279                                 goto do_stall;
3280                         if (e->ep.name == ep0name)
3281                                 goto do_stall;
3282                         set_halt(e);
3283                         if ((dev->quirks & PLX_PCIE) && e->dma)
3284                                 abort_dma(e);
3285                         allow_status(ep);
3286                         ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3287                         goto next_endpoints;
3288                         }
3289                         break;
3290                 default:
3291 delegate:
3292                         ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3293                                 "ep_cfg %08x\n",
3294                                 u.r.bRequestType, u.r.bRequest,
3295                                 w_value, w_index, w_length,
3296                                 readl(&ep->cfg->ep_cfg));
3297                         ep->responded = 0;
3298                         if (dev->async_callbacks) {
3299                                 spin_unlock(&dev->lock);
3300                                 tmp = dev->driver->setup(&dev->gadget, &u.r);
3301                                 spin_lock(&dev->lock);
3302                         }
3303                 }
3304
3305                 /* stall ep0 on error */
3306                 if (tmp < 0) {
3307 do_stall:
3308                         ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3309                                         u.r.bRequestType, u.r.bRequest, tmp);
3310                         dev->protocol_stall = 1;
3311                 }
3312
3313                 /* some in/out token irq should follow; maybe stall then.
3314                  * driver must queue a request (even zlp) or halt ep0
3315                  * before the host times out.
3316                  */
3317         }
3318
3319 #undef  w_value
3320 #undef  w_index
3321 #undef  w_length
3322
3323 next_endpoints:
3324         if ((dev->quirks & PLX_PCIE) && dev->enhanced_mode) {
3325                 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3326                         USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3327                         USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3328
3329                 if (stat & mask) {
3330                         usb338x_handle_ep_intr(dev, stat & mask);
3331                         stat &= ~mask;
3332                 }
3333         } else {
3334                 /* endpoint data irq ? */
3335                 scratch = stat & 0x7f;
3336                 stat &= ~0x7f;
3337                 for (num = 0; scratch; num++) {
3338                         u32             t;
3339
3340                         /* do this endpoint's FIFO and queue need tending? */
3341                         t = BIT(num);
3342                         if ((scratch & t) == 0)
3343                                 continue;
3344                         scratch ^= t;
3345
3346                         ep = &dev->ep[num];
3347                         handle_ep_small(ep);
3348                 }
3349         }
3350
3351         if (stat)
3352                 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3353 }
3354
3355 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3356                 BIT(DMA_C_INTERRUPT) | \
3357                 BIT(DMA_B_INTERRUPT) | \
3358                 BIT(DMA_A_INTERRUPT))
3359 #define PCI_ERROR_INTERRUPTS ( \
3360                 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3361                 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3362                 BIT(PCI_RETRY_ABORT_INTERRUPT))
3363
3364 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3365 __releases(dev->lock)
3366 __acquires(dev->lock)
3367 {
3368         struct net2280_ep       *ep;
3369         u32                     tmp, num, mask, scratch;
3370
3371         /* after disconnect there's nothing else to do! */
3372         tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3373         mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3374
3375         /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3376          * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3377          * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3378          * only indicates a change in the reset state).
3379          */
3380         if (stat & tmp) {
3381                 bool    reset = false;
3382                 bool    disconnect = false;
3383
3384                 /*
3385                  * Ignore disconnects and resets if the speed hasn't been set.
3386                  * VBUS can bounce and there's always an initial reset.
3387                  */
3388                 writel(tmp, &dev->regs->irqstat1);
3389                 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3390                         if ((stat & BIT(VBUS_INTERRUPT)) &&
3391                                         (readl(&dev->usb->usbctl) &
3392                                                 BIT(VBUS_PIN)) == 0) {
3393                                 disconnect = true;
3394                                 ep_dbg(dev, "disconnect %s\n",
3395                                                 dev->driver->driver.name);
3396                         } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3397                                         (readl(&dev->usb->usbstat) & mask)
3398                                                 == 0) {
3399                                 reset = true;
3400                                 ep_dbg(dev, "reset %s\n",
3401                                                 dev->driver->driver.name);
3402                         }
3403
3404                         if (disconnect || reset) {
3405                                 stop_activity(dev, dev->driver);
3406                                 ep0_start(dev);
3407                                 if (dev->async_callbacks) {
3408                                         spin_unlock(&dev->lock);
3409                                         if (reset)
3410                                                 usb_gadget_udc_reset(&dev->gadget, dev->driver);
3411                                         else
3412                                                 (dev->driver->disconnect)(&dev->gadget);
3413                                         spin_lock(&dev->lock);
3414                                 }
3415                                 return;
3416                         }
3417                 }
3418                 stat &= ~tmp;
3419
3420                 /* vBUS can bounce ... one of many reasons to ignore the
3421                  * notion of hotplug events on bus connect/disconnect!
3422                  */
3423                 if (!stat)
3424                         return;
3425         }
3426
3427         /* NOTE: chip stays in PCI D0 state for now, but it could
3428          * enter D1 to save more power
3429          */
3430         tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3431         if (stat & tmp) {
3432                 writel(tmp, &dev->regs->irqstat1);
3433                 spin_unlock(&dev->lock);
3434                 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3435                         if (dev->async_callbacks && dev->driver->suspend)
3436                                 dev->driver->suspend(&dev->gadget);
3437                         if (!enable_suspend)
3438                                 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3439                 } else {
3440                         if (dev->async_callbacks && dev->driver->resume)
3441                                 dev->driver->resume(&dev->gadget);
3442                         /* at high speed, note erratum 0133 */
3443                 }
3444                 spin_lock(&dev->lock);
3445                 stat &= ~tmp;
3446         }
3447
3448         /* clear any other status/irqs */
3449         if (stat)
3450                 writel(stat, &dev->regs->irqstat1);
3451
3452         /* some status we can just ignore */
3453         if (dev->quirks & PLX_2280)
3454                 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3455                           BIT(SUSPEND_REQUEST_INTERRUPT) |
3456                           BIT(RESUME_INTERRUPT) |
3457                           BIT(SOF_INTERRUPT));
3458         else
3459                 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3460                           BIT(RESUME_INTERRUPT) |
3461                           BIT(SOF_DOWN_INTERRUPT) |
3462                           BIT(SOF_INTERRUPT));
3463
3464         if (!stat)
3465                 return;
3466         /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3467
3468         /* DMA status, for ep-{a,b,c,d} */
3469         scratch = stat & DMA_INTERRUPTS;
3470         stat &= ~DMA_INTERRUPTS;
3471         scratch >>= 9;
3472         for (num = 0; scratch; num++) {
3473                 struct net2280_dma_regs __iomem *dma;
3474
3475                 tmp = BIT(num);
3476                 if ((tmp & scratch) == 0)
3477                         continue;
3478                 scratch ^= tmp;
3479
3480                 ep = &dev->ep[num + 1];
3481                 dma = ep->dma;
3482
3483                 if (!dma)
3484                         continue;
3485
3486                 /* clear ep's dma status */
3487                 tmp = readl(&dma->dmastat);
3488                 writel(tmp, &dma->dmastat);
3489
3490                 /* dma sync*/
3491                 if (dev->quirks & PLX_PCIE) {
3492                         u32 r_dmacount = readl(&dma->dmacount);
3493                         if (!ep->is_in &&  (r_dmacount & 0x00FFFFFF) &&
3494                             (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3495                                 continue;
3496                 }
3497
3498                 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3499                         ep_dbg(ep->dev, "%s no xact done? %08x\n",
3500                                 ep->ep.name, tmp);
3501                         continue;
3502                 }
3503                 stop_dma(ep->dma);
3504
3505                 /* OUT transfers terminate when the data from the
3506                  * host is in our memory.  Process whatever's done.
3507                  * On this path, we know transfer's last packet wasn't
3508                  * less than req->length. NAK_OUT_PACKETS may be set,
3509                  * or the FIFO may already be holding new packets.
3510                  *
3511                  * IN transfers can linger in the FIFO for a very
3512                  * long time ... we ignore that for now, accounting
3513                  * precisely (like PIO does) needs per-packet irqs
3514                  */
3515                 scan_dma_completions(ep);
3516
3517                 /* disable dma on inactive queues; else maybe restart */
3518                 if (!list_empty(&ep->queue)) {
3519                         tmp = readl(&dma->dmactl);
3520                         restart_dma(ep);
3521                 }
3522                 ep->irqs++;
3523         }
3524
3525         /* NOTE:  there are other PCI errors we might usefully notice.
3526          * if they appear very often, here's where to try recovering.
3527          */
3528         if (stat & PCI_ERROR_INTERRUPTS) {
3529                 ep_err(dev, "pci dma error; stat %08x\n", stat);
3530                 stat &= ~PCI_ERROR_INTERRUPTS;
3531                 /* these are fatal errors, but "maybe" they won't
3532                  * happen again ...
3533                  */
3534                 stop_activity(dev, dev->driver);
3535                 ep0_start(dev);
3536                 stat = 0;
3537         }
3538
3539         if (stat)
3540                 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3541 }
3542
3543 static irqreturn_t net2280_irq(int irq, void *_dev)
3544 {
3545         struct net2280          *dev = _dev;
3546
3547         /* shared interrupt, not ours */
3548         if ((dev->quirks & PLX_LEGACY) &&
3549                 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3550                 return IRQ_NONE;
3551
3552         spin_lock(&dev->lock);
3553
3554         /* handle disconnect, dma, and more */
3555         handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3556
3557         /* control requests and PIO */
3558         handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3559
3560         if (dev->quirks & PLX_PCIE) {
3561                 /* re-enable interrupt to trigger any possible new interrupt */
3562                 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3563                 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3564                 writel(pciirqenb1, &dev->regs->pciirqenb1);
3565         }
3566
3567         spin_unlock(&dev->lock);
3568
3569         return IRQ_HANDLED;
3570 }
3571
3572 /*-------------------------------------------------------------------------*/
3573
3574 static void gadget_release(struct device *_dev)
3575 {
3576         struct net2280  *dev = container_of(_dev, struct net2280, gadget.dev);
3577
3578         kfree(dev);
3579 }
3580
3581 /* tear down the binding between this driver and the pci device */
3582
3583 static void net2280_remove(struct pci_dev *pdev)
3584 {
3585         struct net2280          *dev = pci_get_drvdata(pdev);
3586
3587         if (dev->added)
3588                 usb_del_gadget(&dev->gadget);
3589
3590         BUG_ON(dev->driver);
3591
3592         /* then clean up the resources we allocated during probe() */
3593         if (dev->requests) {
3594                 int             i;
3595                 for (i = 1; i < 5; i++) {
3596                         if (!dev->ep[i].dummy)
3597                                 continue;
3598                         dma_pool_free(dev->requests, dev->ep[i].dummy,
3599                                         dev->ep[i].td_dma);
3600                 }
3601                 dma_pool_destroy(dev->requests);
3602         }
3603         if (dev->got_irq)
3604                 free_irq(pdev->irq, dev);
3605         if (dev->quirks & PLX_PCIE)
3606                 pci_disable_msi(pdev);
3607         if (dev->regs) {
3608                 net2280_led_shutdown(dev);
3609                 iounmap(dev->regs);
3610         }
3611         if (dev->region)
3612                 release_mem_region(pci_resource_start(pdev, 0),
3613                                 pci_resource_len(pdev, 0));
3614         if (dev->enabled)
3615                 pci_disable_device(pdev);
3616         device_remove_file(&pdev->dev, &dev_attr_registers);
3617
3618         ep_info(dev, "unbind\n");
3619         usb_put_gadget(&dev->gadget);
3620 }
3621
3622 /* wrap this driver around the specified device, but
3623  * don't respond over USB until a gadget driver binds to us.
3624  */
3625
3626 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3627 {
3628         struct net2280          *dev;
3629         unsigned long           resource, len;
3630         void                    __iomem *base = NULL;
3631         int                     retval, i;
3632
3633         /* alloc, and start init */
3634         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3635         if (dev == NULL) {
3636                 retval = -ENOMEM;
3637                 goto done;
3638         }
3639
3640         pci_set_drvdata(pdev, dev);
3641         usb_initialize_gadget(&pdev->dev, &dev->gadget, gadget_release);
3642         spin_lock_init(&dev->lock);
3643         dev->quirks = id->driver_data;
3644         dev->pdev = pdev;
3645         dev->gadget.ops = &net2280_ops;
3646         dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3647                                 USB_SPEED_SUPER : USB_SPEED_HIGH;
3648
3649         /* the "gadget" abstracts/virtualizes the controller */
3650         dev->gadget.name = driver_name;
3651
3652         /* now all the pci goodies ... */
3653         if (pci_enable_device(pdev) < 0) {
3654                 retval = -ENODEV;
3655                 goto done;
3656         }
3657         dev->enabled = 1;
3658
3659         /* BAR 0 holds all the registers
3660          * BAR 1 is 8051 memory; unused here (note erratum 0103)
3661          * BAR 2 is fifo memory; unused here
3662          */
3663         resource = pci_resource_start(pdev, 0);
3664         len = pci_resource_len(pdev, 0);
3665         if (!request_mem_region(resource, len, driver_name)) {
3666                 ep_dbg(dev, "controller already in use\n");
3667                 retval = -EBUSY;
3668                 goto done;
3669         }
3670         dev->region = 1;
3671
3672         /* FIXME provide firmware download interface to put
3673          * 8051 code into the chip, e.g. to turn on PCI PM.
3674          */
3675
3676         base = ioremap(resource, len);
3677         if (base == NULL) {
3678                 ep_dbg(dev, "can't map memory\n");
3679                 retval = -EFAULT;
3680                 goto done;
3681         }
3682         dev->regs = (struct net2280_regs __iomem *) base;
3683         dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3684         dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3685         dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3686         dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3687         dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3688
3689         if (dev->quirks & PLX_PCIE) {
3690                 u32 fsmvalue;
3691                 u32 usbstat;
3692                 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3693                                                         (base + 0x00b4);
3694                 dev->llregs = (struct usb338x_ll_regs __iomem *)
3695                                                         (base + 0x0700);
3696                 dev->plregs = (struct usb338x_pl_regs __iomem *)
3697                                                         (base + 0x0800);
3698                 usbstat = readl(&dev->usb->usbstat);
3699                 dev->enhanced_mode = !!(usbstat & BIT(11));
3700                 dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3701                 /* put into initial config, link up all endpoints */
3702                 fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3703                                         (0xf << DEFECT7374_FSM_FIELD);
3704                 /* See if firmware needs to set up for workaround: */
3705                 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3706                         dev->bug7734_patched = 1;
3707                         writel(0, &dev->usb->usbctl);
3708                 } else
3709                         dev->bug7734_patched = 0;
3710         } else {
3711                 dev->enhanced_mode = 0;
3712                 dev->n_ep = 7;
3713                 /* put into initial config, link up all endpoints */
3714                 writel(0, &dev->usb->usbctl);
3715         }
3716
3717         usb_reset(dev);
3718         usb_reinit(dev);
3719
3720         /* irq setup after old hardware is cleaned up */
3721         if (!pdev->irq) {
3722                 ep_err(dev, "No IRQ.  Check PCI setup!\n");
3723                 retval = -ENODEV;
3724                 goto done;
3725         }
3726
3727         if (dev->quirks & PLX_PCIE)
3728                 if (pci_enable_msi(pdev))
3729                         ep_err(dev, "Failed to enable MSI mode\n");
3730
3731         if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3732                                                         driver_name, dev)) {
3733                 ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3734                 retval = -EBUSY;
3735                 goto done;
3736         }
3737         dev->got_irq = 1;
3738
3739         /* DMA setup */
3740         /* NOTE:  we know only the 32 LSBs of dma addresses may be nonzero */
3741         dev->requests = dma_pool_create("requests", &pdev->dev,
3742                 sizeof(struct net2280_dma),
3743                 0 /* no alignment requirements */,
3744                 0 /* or page-crossing issues */);
3745         if (!dev->requests) {
3746                 ep_dbg(dev, "can't get request pool\n");
3747                 retval = -ENOMEM;
3748                 goto done;
3749         }
3750         for (i = 1; i < 5; i++) {
3751                 struct net2280_dma      *td;
3752
3753                 td = dma_pool_alloc(dev->requests, GFP_KERNEL,
3754                                 &dev->ep[i].td_dma);
3755                 if (!td) {
3756                         ep_dbg(dev, "can't get dummy %d\n", i);
3757                         retval = -ENOMEM;
3758                         goto done;
3759                 }
3760                 td->dmacount = 0;       /* not VALID */
3761                 td->dmadesc = td->dmaaddr;
3762                 dev->ep[i].dummy = td;
3763         }
3764
3765         /* enable lower-overhead pci memory bursts during DMA */
3766         if (dev->quirks & PLX_LEGACY)
3767                 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3768                         /*
3769                          * 256 write retries may not be enough...
3770                            BIT(PCI_RETRY_ABORT_ENABLE) |
3771                         */
3772                         BIT(DMA_READ_MULTIPLE_ENABLE) |
3773                         BIT(DMA_READ_LINE_ENABLE),
3774                         &dev->pci->pcimstctl);
3775         /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3776         pci_set_master(pdev);
3777         pci_try_set_mwi(pdev);
3778
3779         /* ... also flushes any posted pci writes */
3780         dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3781
3782         /* done */
3783         ep_info(dev, "%s\n", driver_desc);
3784         ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3785                         pdev->irq, base, dev->chiprev);
3786         ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3787                 dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3788         retval = device_create_file(&pdev->dev, &dev_attr_registers);
3789         if (retval)
3790                 goto done;
3791
3792         retval = usb_add_gadget(&dev->gadget);
3793         if (retval)
3794                 goto done;
3795         dev->added = 1;
3796         return 0;
3797
3798 done:
3799         if (dev) {
3800                 net2280_remove(pdev);
3801                 kfree(dev);
3802         }
3803         return retval;
3804 }
3805
3806 /* make sure the board is quiescent; otherwise it will continue
3807  * generating IRQs across the upcoming reboot.
3808  */
3809
3810 static void net2280_shutdown(struct pci_dev *pdev)
3811 {
3812         struct net2280          *dev = pci_get_drvdata(pdev);
3813
3814         /* disable IRQs */
3815         writel(0, &dev->regs->pciirqenb0);
3816         writel(0, &dev->regs->pciirqenb1);
3817
3818         /* disable the pullup so the host will think we're gone */
3819         writel(0, &dev->usb->usbctl);
3820
3821 }
3822
3823
3824 /*-------------------------------------------------------------------------*/
3825
3826 static const struct pci_device_id pci_ids[] = { {
3827         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3828         .class_mask =   ~0,
3829         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3830         .device =       0x2280,
3831         .subvendor =    PCI_ANY_ID,
3832         .subdevice =    PCI_ANY_ID,
3833         .driver_data =  PLX_LEGACY | PLX_2280,
3834         }, {
3835         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3836         .class_mask =   ~0,
3837         .vendor =       PCI_VENDOR_ID_PLX_LEGACY,
3838         .device =       0x2282,
3839         .subvendor =    PCI_ANY_ID,
3840         .subdevice =    PCI_ANY_ID,
3841         .driver_data =  PLX_LEGACY,
3842         },
3843         {
3844         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3845         .class_mask =   ~0,
3846         .vendor =       PCI_VENDOR_ID_PLX,
3847         .device =       0x2380,
3848         .subvendor =    PCI_ANY_ID,
3849         .subdevice =    PCI_ANY_ID,
3850         .driver_data =  PLX_PCIE,
3851          },
3852         {
3853         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3854         .class_mask =   ~0,
3855         .vendor =       PCI_VENDOR_ID_PLX,
3856         .device =       0x3380,
3857         .subvendor =    PCI_ANY_ID,
3858         .subdevice =    PCI_ANY_ID,
3859         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3860          },
3861         {
3862         .class =        PCI_CLASS_SERIAL_USB_DEVICE,
3863         .class_mask =   ~0,
3864         .vendor =       PCI_VENDOR_ID_PLX,
3865         .device =       0x3382,
3866         .subvendor =    PCI_ANY_ID,
3867         .subdevice =    PCI_ANY_ID,
3868         .driver_data =  PLX_PCIE | PLX_SUPERSPEED,
3869          },
3870 { /* end: all zeroes */ }
3871 };
3872 MODULE_DEVICE_TABLE(pci, pci_ids);
3873
3874 /* pci driver glue; this is a "new style" PCI driver module */
3875 static struct pci_driver net2280_pci_driver = {
3876         .name =         driver_name,
3877         .id_table =     pci_ids,
3878
3879         .probe =        net2280_probe,
3880         .remove =       net2280_remove,
3881         .shutdown =     net2280_shutdown,
3882
3883         /* FIXME add power management support */
3884 };
3885
3886 module_pci_driver(net2280_pci_driver);
3887
3888 MODULE_DESCRIPTION(DRIVER_DESC);
3889 MODULE_AUTHOR("David Brownell");
3890 MODULE_LICENSE("GPL");