linux/drivers/usb/gadget/udc/net2280.c
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   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
  69static const char driver_name[] = "net2280";
  70static const char driver_desc[] = DRIVER_DESC;
  71
  72static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
  73static const char ep0name[] = "ep0";
  74
  75#define EP_INFO(_name, _caps) \
  76        { \
  77                .name = _name, \
  78                .caps = _caps, \
  79        }
  80
  81static 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 */
 130static ushort fifo_mode;
 131
 132/* "modprobe net2280 fifo_mode=1" etc */
 133module_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 */
 140static bool enable_suspend;
 141
 142/* "modprobe net2280 enable_suspend=1" etc */
 143module_param(enable_suspend, bool, 0444);
 144
 145#define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
 146
 147static 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
 162static void ep_clear_seqnum(struct net2280_ep *ep);
 163static void stop_activity(struct net2280 *dev,
 164                                        struct usb_gadget_driver *driver);
 165static void ep0_start(struct net2280 *dev);
 166
 167/*-------------------------------------------------------------------------*/
 168static 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
 181static int
 182net2280_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
 356print_err:
 357        dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
 358        return ret;
 359}
 360
 361static 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
 376static const struct usb_ep_ops net2280_ep_ops;
 377
 378static 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
 454static 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
 510static void nuke(struct net2280_ep *);
 511
 512static 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
 545static 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
 580static 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 */
 608static 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 */
 668static 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 */
 708static 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 */
 795static 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
 825static 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
 836static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
 837{
 838        handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
 839}
 840
 841static 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
 847static 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
 869static 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
 932static inline void
 933queue_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
 952static void
 953done(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
 984static int
 985net2280_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);
1113done:
1114        spin_unlock_irqrestore(&dev->lock, flags);
1115
1116        /* pci writes may still be posted */
1117        return ret;
1118
1119print_err:
1120        dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1121        return ret;
1122}
1123
1124static inline void
1125dma_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
1132static 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
1199static 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
1210static 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 */
1223static 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 */
1240static 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
1324static int net2280_fifo_status(struct usb_ep *_ep);
1325
1326static int
1327net2280_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
1380print_unlock:
1381        spin_unlock_irqrestore(&ep->dev->lock, flags);
1382print_err:
1383        dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1384        return retval;
1385}
1386
1387static int net2280_set_halt(struct usb_ep *_ep, int value)
1388{
1389        return net2280_set_halt_and_wedge(_ep, value, 0);
1390}
1391
1392static 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
1401static 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
1428static 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
1448static 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
1466static 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
1481static 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
1501static 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
1526static 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
1552static 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
1617static int net2280_start(struct usb_gadget *_gadget,
1618                struct usb_gadget_driver *driver);
1619static int net2280_stop(struct usb_gadget *_gadget);
1620static void net2280_async_callbacks(struct usb_gadget *_gadget, bool enable);
1621
1622static 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 */
1643static 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}
1653static DEVICE_ATTR_RO(function);
1654
1655static 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}
1804static DEVICE_ATTR_RO(registers);
1805
1806static 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
1892done:
1893        spin_unlock_irqrestore(&dev->lock, flags);
1894        return PAGE_SIZE - size;
1895}
1896static 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
1912static 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
1941static 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
1981static 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
2062static 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
2098static 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
2149static 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
2156static 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
2193static 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
2306static 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
2313static 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
2356static 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
2397static 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 */
2410static 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
2454err_func:
2455        device_remove_file(&dev->pdev->dev, &dev_attr_function);
2456err_unbind:
2457        dev->driver = NULL;
2458        return retval;
2459}
2460
2461static 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
2486static 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
2507static 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 */
2522static 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
2762static 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
2782static 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
2842restore_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
2854static 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
2869static 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
3047usb3_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        }
3060do_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
3069next_endpoints3:
3070
3071#undef  w_value
3072#undef  w_index
3073#undef  w_length
3074
3075        return;
3076}
3077
3078static 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
3098static 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:
3291delegate:
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) {
3307do_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
3323next_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
3364static 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
3543static 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
3574static 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
3583static 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
3626static 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
3798done:
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
3810static 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
3826static 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};
3872MODULE_DEVICE_TABLE(pci, pci_ids);
3873
3874/* pci driver glue; this is a "new style" PCI driver module */
3875static 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
3886module_pci_driver(net2280_pci_driver);
3887
3888MODULE_DESCRIPTION(DRIVER_DESC);
3889MODULE_AUTHOR("David Brownell");
3890MODULE_LICENSE("GPL");
3891
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