drivers/usb/gadget/pxa25x_udc.c

   1 /*
   2  * Intel PXA25x and IXP4xx on-chip full speed USB device controllers
   3  *
   4  * Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker)
   5  * Copyright (C) 2003 Robert Schwebel, Pengutronix
   6  * Copyright (C) 2003 Benedikt Spranger, Pengutronix
   7  * Copyright (C) 2003 David Brownell
   8  * Copyright (C) 2003 Joshua Wise
   9  * Copyright (C) 2012 Lukasz Dalek <luk0104@gmail.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  *
  25  * MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell");
  26  */
  27
  28 #define CONFIG_USB_PXA25X_SMALL
  29 #define DRIVER_NAME "pxa25x_udc_linux"
  30 #define ARCH_HAS_PREFETCH
  31
  32 #include <common.h>
  33 #include <errno.h>
  34 #include <asm/byteorder.h>
  35 #include <asm/system.h>
  36 #include <asm/mach-types.h>
  37 #include <asm/unaligned.h>
  38 #include <linux/compat.h>
  39 #include <malloc.h>
  40 #include <asm/io.h>
  41 #include <asm/arch/pxa.h>
  42
  43 #include <linux/usb/ch9.h>
  44 #include <linux/usb/gadget.h>
  45 #include <usb/lin_gadget_compat.h>
  46 #include <asm/arch/pxa-regs.h>
  47
  48 #include "pxa25x_udc.h"
  49
  50 /*
  51  * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x
  52  * series processors.  The UDC for the IXP 4xx series is very similar.
  53  * There are fifteen endpoints, in addition to ep0.
  54  *
  55  * Such controller drivers work with a gadget driver.  The gadget driver
  56  * returns descriptors, implements configuration and data protocols used
  57  * by the host to interact with this device, and allocates endpoints to
  58  * the different protocol interfaces.  The controller driver virtualizes
  59  * usb hardware so that the gadget drivers will be more portable.
  60  *
  61  * This UDC hardware wants to implement a bit too much USB protocol, so
  62  * it constrains the sorts of USB configuration change events that work.
  63  * The errata for these chips are misleading; some "fixed" bugs from
  64  * pxa250 a0/a1 b0/b1/b2 sure act like they're still there.
  65  *
  66  * Note that the UDC hardware supports DMA (except on IXP) but that's
  67  * not used here.  IN-DMA (to host) is simple enough, when the data is
  68  * suitably aligned (16 bytes) ... the network stack doesn't do that,
  69  * other software can.  OUT-DMA is buggy in most chip versions, as well
  70  * as poorly designed (data toggle not automatic).  So this driver won't
  71  * bother using DMA.  (Mostly-working IN-DMA support was available in
  72  * kernels before 2.6.23, but was never enabled or well tested.)
  73  */
  74
  75 #define DRIVER_VERSION  "18-August-2012"
  76 #define DRIVER_DESC     "PXA 25x USB Device Controller driver"
  77
  78 static const char driver_name[] = "pxa25x_udc";
  79 static const char ep0name[] = "ep0";
  80
  81 /* Watchdog */
  82 static inline void start_watchdog(struct pxa25x_udc *udc)
  83 {
  84         debug("Started watchdog\n");
  85         udc->watchdog.base = get_timer(0);
  86         udc->watchdog.running = 1;
  87 }
  88
  89 static inline void stop_watchdog(struct pxa25x_udc *udc)
  90 {
  91         udc->watchdog.running = 0;
  92         debug("Stopped watchdog\n");
  93 }
  94
  95 static inline void test_watchdog(struct pxa25x_udc *udc)
  96 {
  97         if (!udc->watchdog.running)
  98                 return;
  99
 100         debug("watchdog %ld %ld\n", get_timer(udc->watchdog.base),
 101                 udc->watchdog.period);
 102
 103         if (get_timer(udc->watchdog.base) >= udc->watchdog.period) {
 104                 stop_watchdog(udc);
 105                 udc->watchdog.function(udc);
 106         }
 107 }
 108
 109 static void udc_watchdog(struct pxa25x_udc *dev)
 110 {
 111         uint32_t udccs0 = readl(&dev->regs->udccs[0]);
 112
 113         debug("Fired up udc_watchdog\n");
 114
 115         local_irq_disable();
 116         if (dev->ep0state == EP0_STALL
 117                         && (udccs0 & UDCCS0_FST) == 0
 118                         && (udccs0 & UDCCS0_SST) == 0) {
 119                 writel(UDCCS0_FST|UDCCS0_FTF, &dev->regs->udccs[0]);
 120                 debug("ep0 re-stall\n");
 121                 start_watchdog(dev);
 122         }
 123         local_irq_enable();
 124 }
 125
 126 #ifdef DEBUG
 127
 128 static const char * const state_name[] = {
 129         "EP0_IDLE",
 130         "EP0_IN_DATA_PHASE", "EP0_OUT_DATA_PHASE",
 131         "EP0_END_XFER", "EP0_STALL"
 132 };
 133
 134 static void
 135 dump_udccr(const char *label)
 136 {
 137         u32 udccr = readl(&UDC_REGS->udccr);
 138         debug("%s %02X =%s%s%s%s%s%s%s%s\n",
 139                 label, udccr,
 140                 (udccr & UDCCR_REM) ? " rem" : "",
 141                 (udccr & UDCCR_RSTIR) ? " rstir" : "",
 142                 (udccr & UDCCR_SRM) ? " srm" : "",
 143                 (udccr & UDCCR_SUSIR) ? " susir" : "",
 144                 (udccr & UDCCR_RESIR) ? " resir" : "",
 145                 (udccr & UDCCR_RSM) ? " rsm" : "",
 146                 (udccr & UDCCR_UDA) ? " uda" : "",
 147                 (udccr & UDCCR_UDE) ? " ude" : "");
 148 }
 149
 150 static void
 151 dump_udccs0(const char *label)
 152 {
 153         u32 udccs0 = readl(&UDC_REGS->udccs[0]);
 154
 155         debug("%s %s %02X =%s%s%s%s%s%s%s%s\n",
 156                 label, state_name[the_controller->ep0state], udccs0,
 157                 (udccs0 & UDCCS0_SA) ? " sa" : "",
 158                 (udccs0 & UDCCS0_RNE) ? " rne" : "",
 159                 (udccs0 & UDCCS0_FST) ? " fst" : "",
 160                 (udccs0 & UDCCS0_SST) ? " sst" : "",
 161                 (udccs0 & UDCCS0_DRWF) ? " dwrf" : "",
 162                 (udccs0 & UDCCS0_FTF) ? " ftf" : "",
 163                 (udccs0 & UDCCS0_IPR) ? " ipr" : "",
 164                 (udccs0 & UDCCS0_OPR) ? " opr" : "");
 165 }
 166
 167 static void
 168 dump_state(struct pxa25x_udc *dev)
 169 {
 170         u32 tmp;
 171         unsigned i;
 172
 173         debug("%s, uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
 174                 state_name[dev->ep0state],
 175                 readl(&UDC_REGS->uicr1), readl(&UDC_REGS->uicr0),
 176                 readl(&UDC_REGS->usir1), readl(&UDC_REGS->usir0),
 177                 readl(&UDC_REGS->ufnrh), readl(&UDC_REGS->ufnrl));
 178         dump_udccr("udccr");
 179         if (dev->has_cfr) {
 180                 tmp = readl(&UDC_REGS->udccfr);
 181                 debug("udccfr %02X =%s%s\n", tmp,
 182                         (tmp & UDCCFR_AREN) ? " aren" : "",
 183                         (tmp & UDCCFR_ACM) ? " acm" : "");
 184         }
 185
 186         if (!dev->driver) {
 187                 debug("no gadget driver bound\n");
 188                 return;
 189         } else
 190                 debug("ep0 driver '%s'\n", "ether");
 191
 192         dump_udccs0("udccs0");
 193         debug("ep0 IN %lu/%lu, OUT %lu/%lu\n",
 194                 dev->stats.write.bytes, dev->stats.write.ops,
 195                 dev->stats.read.bytes, dev->stats.read.ops);
 196
 197         for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++) {
 198                 if (dev->ep[i].desc == NULL)
 199                         continue;
 200                 debug("udccs%d = %02x\n", i, *dev->ep->reg_udccs);
 201         }
 202 }
 203
 204 #else /* DEBUG */
 205
 206 static inline void dump_udccr(const char *label) { }
 207 static inline void dump_udccs0(const char *label) { }
 208 static inline void dump_state(struct pxa25x_udc *dev) { }
 209
 210 #endif /* DEBUG */
 211
 212 /*
 213  * ---------------------------------------------------------------------------
 214  *      endpoint related parts of the api to the usb controller hardware,
 215  *      used by gadget driver; and the inner talker-to-hardware core.
 216  * ---------------------------------------------------------------------------
 217  */
 218
 219 static void pxa25x_ep_fifo_flush(struct usb_ep *ep);
 220 static void nuke(struct pxa25x_ep *, int status);
 221
 222 /* one GPIO should control a D+ pullup, so host sees this device (or not) */
 223 static void pullup_off(void)
 224 {
 225         struct pxa2xx_udc_mach_info *mach = the_controller->mach;
 226
 227         if (mach->udc_command)
 228                 mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
 229 }
 230
 231 static void pullup_on(void)
 232 {
 233         struct pxa2xx_udc_mach_info *mach = the_controller->mach;
 234
 235         if (mach->udc_command)
 236                 mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
 237 }
 238
 239 static void pio_irq_enable(int bEndpointAddress)
 240 {
 241         bEndpointAddress &= 0xf;
 242         if (bEndpointAddress < 8) {
 243                 clrbits_le32(&the_controller->regs->uicr0,
 244                         1 << bEndpointAddress);
 245         } else {
 246                 bEndpointAddress -= 8;
 247                 clrbits_le32(&the_controller->regs->uicr1,
 248                         1 << bEndpointAddress);
 249         }
 250 }
 251
 252 static void pio_irq_disable(int bEndpointAddress)
 253 {
 254         bEndpointAddress &= 0xf;
 255         if (bEndpointAddress < 8) {
 256                 setbits_le32(&the_controller->regs->uicr0,
 257                         1 << bEndpointAddress);
 258         } else {
 259                 bEndpointAddress -= 8;
 260                 setbits_le32(&the_controller->regs->uicr1,
 261                         1 << bEndpointAddress);
 262         }
 263 }
 264
 265 static inline void udc_set_mask_UDCCR(int mask)
 266 {
 267         /*
 268          * The UDCCR reg contains mask and interrupt status bits,
 269          * so using '|=' isn't safe as it may ack an interrupt.
 270          */
 271         const uint32_t mask_bits = UDCCR_REM | UDCCR_SRM | UDCCR_UDE;
 272
 273         mask &= mask_bits;
 274         clrsetbits_le32(&the_controller->regs->udccr, ~mask_bits, mask);
 275 }
 276
 277 static inline void udc_clear_mask_UDCCR(int mask)
 278 {
 279         const uint32_t mask_bits = UDCCR_REM | UDCCR_SRM | UDCCR_UDE;
 280
 281         mask = ~mask & mask_bits;
 282         clrbits_le32(&the_controller->regs->udccr, ~mask);
 283 }
 284
 285 static inline void udc_ack_int_UDCCR(int mask)
 286 {
 287         const uint32_t mask_bits = UDCCR_REM | UDCCR_SRM | UDCCR_UDE;
 288
 289         mask &= ~mask_bits;
 290         clrsetbits_le32(&the_controller->regs->udccr, ~mask_bits, mask);
 291 }
 292
 293 /*
 294  * endpoint enable/disable
 295  *
 296  * we need to verify the descriptors used to enable endpoints.  since pxa25x
 297  * endpoint configurations are fixed, and are pretty much always enabled,
 298  * there's not a lot to manage here.
 299  *
 300  * because pxa25x can't selectively initialize bulk (or interrupt) endpoints,
 301  * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except
 302  * for a single interface (with only the default altsetting) and for gadget
 303  * drivers that don't halt endpoints (not reset by set_interface).  that also
 304  * means that if you use ISO, you must violate the USB spec rule that all
 305  * iso endpoints must be in non-default altsettings.
 306  */
 307 static int pxa25x_ep_enable(struct usb_ep *_ep,
 308                 const struct usb_endpoint_descriptor *desc)
 309 {
 310         struct pxa25x_ep *ep;
 311         struct pxa25x_udc *dev;
 312
 313         ep = container_of(_ep, struct pxa25x_ep, ep);
 314         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 315                         || desc->bDescriptorType != USB_DT_ENDPOINT
 316                         || ep->bEndpointAddress != desc->bEndpointAddress
 317                         || ep->fifo_size <
 318                            le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {
 319                 printf("%s, bad ep or descriptor\n", __func__);
 320                 return -EINVAL;
 321         }
 322
 323         /* xfer types must match, except that interrupt ~= bulk */
 324         if (ep->bmAttributes != desc->bmAttributes
 325                         && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 326                         && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 327                 printf("%s, %s type mismatch\n", __func__, _ep->name);
 328                 return -EINVAL;
 329         }
 330
 331         /* hardware _could_ do smaller, but driver doesn't */
 332         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 333                         && le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))
 334                                                 != BULK_FIFO_SIZE)
 335                         || !get_unaligned(&desc->wMaxPacketSize)) {
 336                 printf("%s, bad %s maxpacket\n", __func__, _ep->name);
 337                 return -ERANGE;
 338         }
 339
 340         dev = ep->dev;
 341         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 342                 printf("%s, bogus device state\n", __func__);
 343                 return -ESHUTDOWN;
 344         }
 345
 346         ep->desc = desc;
 347         ep->stopped = 0;
 348         ep->pio_irqs = 0;
 349         ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 350
 351         /* flush fifo (mostly for OUT buffers) */
 352         pxa25x_ep_fifo_flush(_ep);
 353
 354         /* ... reset halt state too, if we could ... */
 355
 356         debug("enabled %s\n", _ep->name);
 357         return 0;
 358 }
 359
 360 static int pxa25x_ep_disable(struct usb_ep *_ep)
 361 {
 362         struct pxa25x_ep *ep;
 363         unsigned long flags;
 364
 365         ep = container_of(_ep, struct pxa25x_ep, ep);
 366         if (!_ep || !ep->desc) {
 367                 printf("%s, %s not enabled\n", __func__,
 368                         _ep ? ep->ep.name : NULL);
 369                 return -EINVAL;
 370         }
 371         local_irq_save(flags);
 372
 373         nuke(ep, -ESHUTDOWN);
 374
 375         /* flush fifo (mostly for IN buffers) */
 376         pxa25x_ep_fifo_flush(_ep);
 377
 378         ep->desc = NULL;
 379         ep->stopped = 1;
 380
 381         local_irq_restore(flags);
 382         debug("%s disabled\n", _ep->name);
 383         return 0;
 384 }
 385
 386 /*-------------------------------------------------------------------------*/
 387
 388 /*
 389  * for the pxa25x, these can just wrap kmalloc/kfree.  gadget drivers
 390  * must still pass correctly initialized endpoints, since other controller
 391  * drivers may care about how it's currently set up (dma issues etc).
 392  */
 393
 394 /*
 395  *      pxa25x_ep_alloc_request - allocate a request data structure
 396  */
 397 static struct usb_request *
 398 pxa25x_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 399 {
 400         struct pxa25x_request *req;
 401
 402         req = kzalloc(sizeof(*req), gfp_flags);
 403         if (!req)
 404                 return NULL;
 405
 406         INIT_LIST_HEAD(&req->queue);
 407         return &req->req;
 408 }
 409
 410
 411 /*
 412  *      pxa25x_ep_free_request - deallocate a request data structure
 413  */
 414 static void
 415 pxa25x_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 416 {
 417         struct pxa25x_request   *req;
 418
 419         req = container_of(_req, struct pxa25x_request, req);
 420         WARN_ON(!list_empty(&req->queue));
 421         kfree(req);
 422 }
 423
 424 /*-------------------------------------------------------------------------*/
 425
 426 /*
 427  *      done - retire a request; caller blocked irqs
 428  */
 429 static void done(struct pxa25x_ep *ep, struct pxa25x_request *req, int status)
 430 {
 431         unsigned stopped = ep->stopped;
 432
 433         list_del_init(&req->queue);
 434
 435         if (likely(req->req.status == -EINPROGRESS))
 436                 req->req.status = status;
 437         else
 438                 status = req->req.status;
 439
 440         if (status && status != -ESHUTDOWN)
 441                 debug("complete %s req %p stat %d len %u/%u\n",
 442                         ep->ep.name, &req->req, status,
 443                         req->req.actual, req->req.length);
 444
 445         /* don't modify queue heads during completion callback */
 446         ep->stopped = 1;
 447         req->req.complete(&ep->ep, &req->req);
 448         ep->stopped = stopped;
 449 }
 450
 451
 452 static inline void ep0_idle(struct pxa25x_udc *dev)
 453 {
 454         dev->ep0state = EP0_IDLE;
 455 }
 456
 457 static int
 458 write_packet(u32 *uddr, struct pxa25x_request *req, unsigned max)
 459 {
 460         u8 *buf;
 461         unsigned length, count;
 462
 463         debug("%s(): uddr %p\n", __func__, uddr);
 464
 465         buf = req->req.buf + req->req.actual;
 466         prefetch(buf);
 467
 468         /* how big will this packet be? */
 469         length = min(req->req.length - req->req.actual, max);
 470         req->req.actual += length;
 471
 472         count = length;
 473         while (likely(count--))
 474                 writeb(*buf++, uddr);
 475
 476         return length;
 477 }
 478
 479 /*
 480  * write to an IN endpoint fifo, as many packets as possible.
 481  * irqs will use this to write the rest later.
 482  * caller guarantees at least one packet buffer is ready (or a zlp).
 483  */
 484 static int
 485 write_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req)
 486 {
 487         unsigned max;
 488
 489         max = le16_to_cpu(get_unaligned(&ep->desc->wMaxPacketSize));
 490         do {
 491                 unsigned count;
 492                 int is_last, is_short;
 493
 494                 count = write_packet(ep->reg_uddr, req, max);
 495
 496                 /* last packet is usually short (or a zlp) */
 497                 if (unlikely(count != max))
 498                         is_last = is_short = 1;
 499                 else {
 500                         if (likely(req->req.length != req->req.actual)
 501                                         || req->req.zero)
 502                                 is_last = 0;
 503                         else
 504                                 is_last = 1;
 505                         /* interrupt/iso maxpacket may not fill the fifo */
 506                         is_short = unlikely(max < ep->fifo_size);
 507                 }
 508
 509                 debug_cond(NOISY, "wrote %s %d bytes%s%s %d left %p\n",
 510                         ep->ep.name, count,
 511                         is_last ? "/L" : "", is_short ? "/S" : "",
 512                         req->req.length - req->req.actual, req);
 513
 514                 /*
 515                  * let loose that packet. maybe try writing another one,
 516                  * double buffering might work.  TSP, TPC, and TFS
 517                  * bit values are the same for all normal IN endpoints.
 518                  */
 519                 writel(UDCCS_BI_TPC, ep->reg_udccs);
 520                 if (is_short)
 521                         writel(UDCCS_BI_TSP, ep->reg_udccs);
 522
 523                 /* requests complete when all IN data is in the FIFO */
 524                 if (is_last) {
 525                         done(ep, req, 0);
 526                         if (list_empty(&ep->queue))
 527                                 pio_irq_disable(ep->bEndpointAddress);
 528                         return 1;
 529                 }
 530
 531                 /*
 532                  * TODO experiment: how robust can fifo mode tweaking be?
 533                  * double buffering is off in the default fifo mode, which
 534                  * prevents TFS from being set here.
 535                  */
 536
 537         } while (readl(ep->reg_udccs) & UDCCS_BI_TFS);
 538         return 0;
 539 }
 540
 541 /*
 542  * caller asserts req->pending (ep0 irq status nyet cleared); starts
 543  * ep0 data stage.  these chips want very simple state transitions.
 544  */
 545 static inline
 546 void ep0start(struct pxa25x_udc *dev, u32 flags, const char *tag)
 547 {
 548         writel(flags|UDCCS0_SA|UDCCS0_OPR, &dev->regs->udccs[0]);
 549         writel(USIR0_IR0, &dev->regs->usir0);
 550         dev->req_pending = 0;
 551         debug_cond(NOISY, "%s() %s, udccs0: %02x/%02x usir: %X.%X\n",
 552                 __func__, tag, readl(&dev->regs->udccs[0]), flags,
 553                 readl(&dev->regs->usir1), readl(&dev->regs->usir0));
 554 }
 555
 556 static int
 557 write_ep0_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req)
 558 {
 559         unsigned count;
 560         int is_short;
 561
 562         count = write_packet(&ep->dev->regs->uddr0, req, EP0_FIFO_SIZE);
 563         ep->dev->stats.write.bytes += count;
 564
 565         /* last packet "must be" short (or a zlp) */
 566         is_short = (count != EP0_FIFO_SIZE);
 567
 568         debug_cond(NOISY, "ep0in %d bytes %d left %p\n", count,
 569                 req->req.length - req->req.actual, req);
 570
 571         if (unlikely(is_short)) {
 572                 if (ep->dev->req_pending)
 573                         ep0start(ep->dev, UDCCS0_IPR, "short IN");
 574                 else
 575                         writel(UDCCS0_IPR, &ep->dev->regs->udccs[0]);
 576
 577                 count = req->req.length;
 578                 done(ep, req, 0);
 579                 ep0_idle(ep->dev);
 580
 581                 /*
 582                  * This seems to get rid of lost status irqs in some cases:
 583                  * host responds quickly, or next request involves config
 584                  * change automagic, or should have been hidden, or ...
 585                  *
 586                  * FIXME get rid of all udelays possible...
 587                  */
 588                 if (count >= EP0_FIFO_SIZE) {
 589                         count = 100;
 590                         do {
 591                                 if ((readl(&ep->dev->regs->udccs[0]) &
 592                                      UDCCS0_OPR) != 0) {
 593                                         /* clear OPR, generate ack */
 594                                         writel(UDCCS0_OPR,
 595                                                 &ep->dev->regs->udccs[0]);
 596                                         break;
 597                                 }
 598                                 count--;
 599                                 udelay(1);
 600                         } while (count);
 601                 }
 602         } else if (ep->dev->req_pending)
 603                 ep0start(ep->dev, 0, "IN");
 604
 605         return is_short;
 606 }
 607
 608
 609 /*
 610  * read_fifo -  unload packet(s) from the fifo we use for usb OUT
 611  * transfers and put them into the request.  caller should have made
 612  * sure there's at least one packet ready.
 613  *
 614  * returns true if the request completed because of short packet or the
 615  * request buffer having filled (and maybe overran till end-of-packet).
 616  */
 617 static int
 618 read_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req)
 619 {
 620         u32 udccs;
 621         u8 *buf;
 622         unsigned bufferspace, count, is_short;
 623
 624         for (;;) {
 625                 /*
 626                  * make sure there's a packet in the FIFO.
 627                  * UDCCS_{BO,IO}_RPC are all the same bit value.
 628                  * UDCCS_{BO,IO}_RNE are all the same bit value.
 629                  */
 630                 udccs = readl(ep->reg_udccs);
 631                 if (unlikely((udccs & UDCCS_BO_RPC) == 0))
 632                         break;
 633                 buf = req->req.buf + req->req.actual;
 634                 prefetchw(buf);
 635                 bufferspace = req->req.length - req->req.actual;
 636
 637                 /* read all bytes from this packet */
 638                 if (likely(udccs & UDCCS_BO_RNE)) {
 639                         count = 1 + (0x0ff & readl(ep->reg_ubcr));
 640                         req->req.actual += min(count, bufferspace);
 641                 } else /* zlp */
 642                         count = 0;
 643                 is_short = (count < ep->ep.maxpacket);
 644                 debug_cond(NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n",
 645                         ep->ep.name, udccs, count,
 646                         is_short ? "/S" : "",
 647                         req, req->req.actual, req->req.length);
 648                 while (likely(count-- != 0)) {
 649                         u8 byte = readb(ep->reg_uddr);
 650
 651                         if (unlikely(bufferspace == 0)) {
 652                                 /*
 653                                  * this happens when the driver's buffer
 654                                  * is smaller than what the host sent.
 655                                  * discard the extra data.
 656                                  */
 657                                 if (req->req.status != -EOVERFLOW)
 658                                         printf("%s overflow %d\n",
 659                                                 ep->ep.name, count);
 660                                 req->req.status = -EOVERFLOW;
 661                         } else {
 662                                 *buf++ = byte;
 663                                 bufferspace--;
 664                         }
 665                 }
 666                 writel(UDCCS_BO_RPC, ep->reg_udccs);
 667                 /* RPC/RSP/RNE could now reflect the other packet buffer */
 668
 669                 /* iso is one request per packet */
 670                 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 671                         if (udccs & UDCCS_IO_ROF)
 672                                 req->req.status = -EHOSTUNREACH;
 673                         /* more like "is_done" */
 674                         is_short = 1;
 675                 }
 676
 677                 /* completion */
 678                 if (is_short || req->req.actual == req->req.length) {
 679                         done(ep, req, 0);
 680                         if (list_empty(&ep->queue))
 681                                 pio_irq_disable(ep->bEndpointAddress);
 682                         return 1;
 683                 }
 684
 685                 /* finished that packet.  the next one may be waiting... */
 686         }
 687         return 0;
 688 }
 689
 690 /*
 691  * special ep0 version of the above.  no UBCR0 or double buffering; status
 692  * handshaking is magic.  most device protocols don't need control-OUT.
 693  * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other
 694  * protocols do use them.
 695  */
 696 static int
 697 read_ep0_fifo(struct pxa25x_ep *ep, struct pxa25x_request *req)
 698 {
 699         u8 *buf, byte;
 700         unsigned bufferspace;
 701
 702         buf = req->req.buf + req->req.actual;
 703         bufferspace = req->req.length - req->req.actual;
 704
 705         while (readl(&ep->dev->regs->udccs[0]) & UDCCS0_RNE) {
 706                 byte = (u8)readb(&ep->dev->regs->uddr0);
 707
 708                 if (unlikely(bufferspace == 0)) {
 709                         /*
 710                          * this happens when the driver's buffer
 711                          * is smaller than what the host sent.
 712                          * discard the extra data.
 713                          */
 714                         if (req->req.status != -EOVERFLOW)
 715                                 printf("%s overflow\n", ep->ep.name);
 716                         req->req.status = -EOVERFLOW;
 717                 } else {
 718                         *buf++ = byte;
 719                         req->req.actual++;
 720                         bufferspace--;
 721                 }
 722         }
 723
 724         writel(UDCCS0_OPR | UDCCS0_IPR, &ep->dev->regs->udccs[0]);
 725
 726         /* completion */
 727         if (req->req.actual >= req->req.length)
 728                 return 1;
 729
 730         /* finished that packet.  the next one may be waiting... */
 731         return 0;
 732 }
 733
 734 /*-------------------------------------------------------------------------*/
 735
 736 static int
 737 pxa25x_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 738 {
 739         struct pxa25x_request *req;
 740         struct pxa25x_ep *ep;
 741         struct pxa25x_udc *dev;
 742         unsigned long flags;
 743
 744         req = container_of(_req, struct pxa25x_request, req);
 745         if (unlikely(!_req || !_req->complete || !_req->buf
 746                         || !list_empty(&req->queue))) {
 747                 printf("%s, bad params\n", __func__);
 748                 return -EINVAL;
 749         }
 750
 751         ep = container_of(_ep, struct pxa25x_ep, ep);
 752         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 753                 printf("%s, bad ep\n", __func__);
 754                 return -EINVAL;
 755         }
 756
 757         dev = ep->dev;
 758         if (unlikely(!dev->driver
 759                         || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
 760                 printf("%s, bogus device state\n", __func__);
 761                 return -ESHUTDOWN;
 762         }
 763
 764         /*
 765          * iso is always one packet per request, that's the only way
 766          * we can report per-packet status.  that also helps with dma.
 767          */
 768         if (unlikely(ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
 769                         && req->req.length >
 770                         le16_to_cpu(get_unaligned(&ep->desc->wMaxPacketSize))))
 771                 return -EMSGSIZE;
 772
 773         debug_cond(NOISY, "%s queue req %p, len %d buf %p\n",
 774                 _ep->name, _req, _req->length, _req->buf);
 775
 776         local_irq_save(flags);
 777
 778         _req->status = -EINPROGRESS;
 779         _req->actual = 0;
 780
 781         /* kickstart this i/o queue? */
 782         if (list_empty(&ep->queue) && !ep->stopped) {
 783                 if (ep->desc == NULL/* ep0 */) {
 784                         unsigned length = _req->length;
 785
 786                         switch (dev->ep0state) {
 787                         case EP0_IN_DATA_PHASE:
 788                                 dev->stats.write.ops++;
 789                                 if (write_ep0_fifo(ep, req))
 790                                         req = NULL;
 791                                 break;
 792
 793                         case EP0_OUT_DATA_PHASE:
 794                                 dev->stats.read.ops++;
 795                                 /* messy ... */
 796                                 if (dev->req_config) {
 797                                         debug("ep0 config ack%s\n",
 798                                                 dev->has_cfr ?  "" : " raced");
 799                                         if (dev->has_cfr)
 800                                                 writel(UDCCFR_AREN|UDCCFR_ACM
 801                                                         |UDCCFR_MB1,
 802                                                         &ep->dev->regs->udccfr);
 803                                         done(ep, req, 0);
 804                                         dev->ep0state = EP0_END_XFER;
 805                                         local_irq_restore(flags);
 806                                         return 0;
 807                                 }
 808                                 if (dev->req_pending)
 809                                         ep0start(dev, UDCCS0_IPR, "OUT");
 810                                 if (length == 0 ||
 811                                                 ((readl(
 812                                                 &ep->dev->regs->udccs[0])
 813                                                 & UDCCS0_RNE) != 0
 814                                                 && read_ep0_fifo(ep, req))) {
 815                                         ep0_idle(dev);
 816                                         done(ep, req, 0);
 817                                         req = NULL;
 818                                 }
 819                                 break;
 820
 821                         default:
 822                                 printf("ep0 i/o, odd state %d\n",
 823                                         dev->ep0state);
 824                                 local_irq_restore(flags);
 825                                 return -EL2HLT;
 826                         }
 827                 /* can the FIFO can satisfy the request immediately? */
 828                 } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
 829                         if ((readl(ep->reg_udccs) & UDCCS_BI_TFS) != 0
 830                                         && write_fifo(ep, req))
 831                                 req = NULL;
 832                 } else if ((readl(ep->reg_udccs) & UDCCS_BO_RFS) != 0
 833                                 && read_fifo(ep, req)) {
 834                         req = NULL;
 835                 }
 836
 837                 if (likely(req && ep->desc))
 838                         pio_irq_enable(ep->bEndpointAddress);
 839         }
 840
 841         /* pio or dma irq handler advances the queue. */
 842         if (likely(req != NULL))
 843                 list_add_tail(&req->queue, &ep->queue);
 844         local_irq_restore(flags);
 845
 846         return 0;
 847 }
 848
 849
 850 /*
 851  *      nuke - dequeue ALL requests
 852  */
 853 static void nuke(struct pxa25x_ep *ep, int status)
 854 {
 855         struct pxa25x_request *req;
 856
 857         /* called with irqs blocked */
 858         while (!list_empty(&ep->queue)) {
 859                 req = list_entry(ep->queue.next,
 860                                 struct pxa25x_request,
 861                                 queue);
 862                 done(ep, req, status);
 863         }
 864         if (ep->desc)
 865                 pio_irq_disable(ep->bEndpointAddress);
 866 }
 867
 868
 869 /* dequeue JUST ONE request */
 870 static int pxa25x_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 871 {
 872         struct pxa25x_ep *ep;
 873         struct pxa25x_request *req;
 874         unsigned long flags;
 875
 876         ep = container_of(_ep, struct pxa25x_ep, ep);
 877         if (!_ep || ep->ep.name == ep0name)
 878                 return -EINVAL;
 879
 880         local_irq_save(flags);
 881
 882         /* make sure it's actually queued on this endpoint */
 883         list_for_each_entry(req, &ep->queue, queue) {
 884                 if (&req->req == _req)
 885                         break;
 886         }
 887         if (&req->req != _req) {
 888                 local_irq_restore(flags);
 889                 return -EINVAL;
 890         }
 891
 892         done(ep, req, -ECONNRESET);
 893
 894         local_irq_restore(flags);
 895         return 0;
 896 }
 897
 898 /*-------------------------------------------------------------------------*/
 899
 900 static int pxa25x_ep_set_halt(struct usb_ep *_ep, int value)
 901 {
 902         struct pxa25x_ep *ep;
 903         unsigned long flags;
 904
 905         ep = container_of(_ep, struct pxa25x_ep, ep);
 906         if (unlikely(!_ep
 907                         || (!ep->desc && ep->ep.name != ep0name))
 908                         || ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 909                 printf("%s, bad ep\n", __func__);
 910                 return -EINVAL;
 911         }
 912         if (value == 0) {
 913                 /*
 914                  * this path (reset toggle+halt) is needed to implement
 915                  * SET_INTERFACE on normal hardware.  but it can't be
 916                  * done from software on the PXA UDC, and the hardware
 917                  * forgets to do it as part of SET_INTERFACE automagic.
 918                  */
 919                 printf("only host can clear %s halt\n", _ep->name);
 920                 return -EROFS;
 921         }
 922
 923         local_irq_save(flags);
 924
 925         if ((ep->bEndpointAddress & USB_DIR_IN) != 0
 926                         && ((readl(ep->reg_udccs) & UDCCS_BI_TFS) == 0
 927                            || !list_empty(&ep->queue))) {
 928                 local_irq_restore(flags);
 929                 return -EAGAIN;
 930         }
 931
 932         /* FST bit is the same for control, bulk in, bulk out, interrupt in */
 933         writel(UDCCS_BI_FST|UDCCS_BI_FTF, ep->reg_udccs);
 934
 935         /* ep0 needs special care */
 936         if (!ep->desc) {
 937                 start_watchdog(ep->dev);
 938                 ep->dev->req_pending = 0;
 939                 ep->dev->ep0state = EP0_STALL;
 940
 941         /* and bulk/intr endpoints like dropping stalls too */
 942         } else {
 943                 unsigned i;
 944                 for (i = 0; i < 1000; i += 20) {
 945                         if (readl(ep->reg_udccs) & UDCCS_BI_SST)
 946                                 break;
 947                         udelay(20);
 948                 }
 949         }
 950         local_irq_restore(flags);
 951
 952         debug("%s halt\n", _ep->name);
 953         return 0;
 954 }
 955
 956 static int pxa25x_ep_fifo_status(struct usb_ep *_ep)
 957 {
 958         struct pxa25x_ep        *ep;
 959
 960         ep = container_of(_ep, struct pxa25x_ep, ep);
 961         if (!_ep) {
 962                 printf("%s, bad ep\n", __func__);
 963                 return -ENODEV;
 964         }
 965         /* pxa can't report unclaimed bytes from IN fifos */
 966         if ((ep->bEndpointAddress & USB_DIR_IN) != 0)
 967                 return -EOPNOTSUPP;
 968         if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN
 969                         || (readl(ep->reg_udccs) & UDCCS_BO_RFS) == 0)
 970                 return 0;
 971         else
 972                 return (readl(ep->reg_ubcr) & 0xfff) + 1;
 973 }
 974
 975 static void pxa25x_ep_fifo_flush(struct usb_ep *_ep)
 976 {
 977         struct pxa25x_ep        *ep;
 978
 979         ep = container_of(_ep, struct pxa25x_ep, ep);
 980         if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) {
 981                 printf("%s, bad ep\n", __func__);
 982                 return;
 983         }
 984
 985         /* toggle and halt bits stay unchanged */
 986
 987         /* for OUT, just read and discard the FIFO contents. */
 988         if ((ep->bEndpointAddress & USB_DIR_IN) == 0) {
 989                 while (((readl(ep->reg_udccs)) & UDCCS_BO_RNE) != 0)
 990                         (void)readb(ep->reg_uddr);
 991                 return;
 992         }
 993
 994         /* most IN status is the same, but ISO can't stall */
 995         writel(UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR
 996                 | (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
 997                         ? 0 : UDCCS_BI_SST), ep->reg_udccs);
 998 }
 999
1000
1001 static struct usb_ep_ops pxa25x_ep_ops = {
1002         .enable         = pxa25x_ep_enable,
1003         .disable        = pxa25x_ep_disable,
1004
1005         .alloc_request  = pxa25x_ep_alloc_request,
1006         .free_request   = pxa25x_ep_free_request,
1007
1008         .queue          = pxa25x_ep_queue,
1009         .dequeue        = pxa25x_ep_dequeue,
1010
1011         .set_halt       = pxa25x_ep_set_halt,
1012         .fifo_status    = pxa25x_ep_fifo_status,
1013         .fifo_flush     = pxa25x_ep_fifo_flush,
1014 };
1015
1016
1017 /* ---------------------------------------------------------------------------
1018  *      device-scoped parts of the api to the usb controller hardware
1019  * ---------------------------------------------------------------------------
1020  */
1021
1022 static int pxa25x_udc_get_frame(struct usb_gadget *_gadget)
1023 {
1024         return ((readl(&the_controller->regs->ufnrh) & 0x07) << 8) |
1025                 (readl(&the_controller->regs->ufnrl) & 0xff);
1026 }
1027
1028 static int pxa25x_udc_wakeup(struct usb_gadget *_gadget)
1029 {
1030         /* host may not have enabled remote wakeup */
1031         if ((readl(&the_controller->regs->udccs[0]) & UDCCS0_DRWF) == 0)
1032                 return -EHOSTUNREACH;
1033         udc_set_mask_UDCCR(UDCCR_RSM);
1034         return 0;
1035 }
1036
1037 static void stop_activity(struct pxa25x_udc *, struct usb_gadget_driver *);
1038 static void udc_enable(struct pxa25x_udc *);
1039 static void udc_disable(struct pxa25x_udc *);
1040
1041 /*
1042  * We disable the UDC -- and its 48 MHz clock -- whenever it's not
1043  * in active use.
1044  */
1045 static int pullup(struct pxa25x_udc *udc)
1046 {
1047         if (udc->pullup)
1048                 pullup_on();
1049         else
1050                 pullup_off();
1051
1052
1053         int is_active = udc->pullup;
1054         if (is_active) {
1055                 if (!udc->active) {
1056                         udc->active = 1;
1057                         udc_enable(udc);
1058                 }
1059         } else {
1060                 if (udc->active) {
1061                         if (udc->gadget.speed != USB_SPEED_UNKNOWN)
1062                                 stop_activity(udc, udc->driver);
1063                         udc_disable(udc);
1064                         udc->active = 0;
1065                 }
1066
1067         }
1068         return 0;
1069 }
1070
1071 /* VBUS reporting logically comes from a transceiver */
1072 static int pxa25x_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1073 {
1074         struct pxa25x_udc *udc;
1075
1076         udc = container_of(_gadget, struct pxa25x_udc, gadget);
1077         printf("vbus %s\n", is_active ? "supplied" : "inactive");
1078         pullup(udc);
1079         return 0;
1080 }
1081
1082 /* drivers may have software control over D+ pullup */
1083 static int pxa25x_udc_pullup(struct usb_gadget *_gadget, int is_active)
1084 {
1085         struct pxa25x_udc       *udc;
1086
1087         udc = container_of(_gadget, struct pxa25x_udc, gadget);
1088
1089         /* not all boards support pullup control */
1090         if (!udc->mach->udc_command)
1091                 return -EOPNOTSUPP;
1092
1093         udc->pullup = (is_active != 0);
1094         pullup(udc);
1095         return 0;
1096 }
1097
1098 /*
1099  * boards may consume current from VBUS, up to 100-500mA based on config.
1100  * the 500uA suspend ceiling means that exclusively vbus-powered PXA designs
1101  * violate USB specs.
1102  */
1103 static int pxa25x_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
1104 {
1105         return -EOPNOTSUPP;
1106 }
1107
1108 static const struct usb_gadget_ops pxa25x_udc_ops = {
1109         .get_frame      = pxa25x_udc_get_frame,
1110         .wakeup         = pxa25x_udc_wakeup,
1111         .vbus_session   = pxa25x_udc_vbus_session,
1112         .pullup         = pxa25x_udc_pullup,
1113         .vbus_draw      = pxa25x_udc_vbus_draw,
1114 };
1115
1116 /*-------------------------------------------------------------------------*/
1117
1118 /*
1119  *      udc_disable - disable USB device controller
1120  */
1121 static void udc_disable(struct pxa25x_udc *dev)
1122 {
1123         /* block all irqs */
1124         udc_set_mask_UDCCR(UDCCR_SRM|UDCCR_REM);
1125         writel(0xff, &dev->regs->uicr0);
1126         writel(0xff, &dev->regs->uicr1);
1127         writel(UFNRH_SIM, &dev->regs->ufnrh);
1128
1129         /* if hardware supports it, disconnect from usb */
1130         pullup_off();
1131
1132         udc_clear_mask_UDCCR(UDCCR_UDE);
1133
1134         ep0_idle(dev);
1135         dev->gadget.speed = USB_SPEED_UNKNOWN;
1136 }
1137
1138 /*
1139  *      udc_reinit - initialize software state
1140  */
1141 static void udc_reinit(struct pxa25x_udc *dev)
1142 {
1143         u32 i;
1144
1145         /* device/ep0 records init */
1146         INIT_LIST_HEAD(&dev->gadget.ep_list);
1147         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
1148         dev->ep0state = EP0_IDLE;
1149
1150         /* basic endpoint records init */
1151         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1152                 struct pxa25x_ep *ep = &dev->ep[i];
1153
1154                 if (i != 0)
1155                         list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
1156
1157                 ep->desc = NULL;
1158                 ep->stopped = 0;
1159                 INIT_LIST_HEAD(&ep->queue);
1160                 ep->pio_irqs = 0;
1161         }
1162
1163         /* the rest was statically initialized, and is read-only */
1164 }
1165
1166 /*
1167  * until it's enabled, this UDC should be completely invisible
1168  * to any USB host.
1169  */
1170 static void udc_enable(struct pxa25x_udc *dev)
1171 {
1172         debug("udc: enabling udc\n");
1173
1174         udc_clear_mask_UDCCR(UDCCR_UDE);
1175
1176         /*
1177          * Try to clear these bits before we enable the udc.
1178          * Do not touch reset ack bit, we would take care of it in
1179          * interrupt handle routine
1180          */
1181         udc_ack_int_UDCCR(UDCCR_SUSIR|UDCCR_RESIR);
1182
1183         ep0_idle(dev);
1184         dev->gadget.speed = USB_SPEED_UNKNOWN;
1185         dev->stats.irqs = 0;
1186
1187         /*
1188          * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual:
1189          * - enable UDC
1190          * - if RESET is already in progress, ack interrupt
1191          * - unmask reset interrupt
1192          */
1193         udc_set_mask_UDCCR(UDCCR_UDE);
1194         if (!(readl(&dev->regs->udccr) & UDCCR_UDA))
1195                 udc_ack_int_UDCCR(UDCCR_RSTIR);
1196
1197         if (dev->has_cfr /* UDC_RES2 is defined */) {
1198                 /*
1199                  * pxa255 (a0+) can avoid a set_config race that could
1200                  * prevent gadget drivers from configuring correctly
1201                  */
1202                 writel(UDCCFR_ACM | UDCCFR_MB1, &dev->regs->udccfr);
1203         }
1204
1205         /* enable suspend/resume and reset irqs */
1206         udc_clear_mask_UDCCR(UDCCR_SRM | UDCCR_REM);
1207
1208         /* enable ep0 irqs */
1209         clrbits_le32(&dev->regs->uicr0, UICR0_IM0);
1210
1211         /* if hardware supports it, pullup D+ and wait for reset */
1212         pullup_on();
1213 }
1214
1215 static inline void clear_ep_state(struct pxa25x_udc *dev)
1216 {
1217         unsigned i;
1218
1219         /*
1220          * hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint
1221          * fifos, and pending transactions mustn't be continued in any case.
1222          */
1223         for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++)
1224                 nuke(&dev->ep[i], -ECONNABORTED);
1225 }
1226
1227 static void handle_ep0(struct pxa25x_udc *dev)
1228 {
1229         u32 udccs0 = readl(&dev->regs->udccs[0]);
1230         struct pxa25x_ep *ep = &dev->ep[0];
1231         struct pxa25x_request *req;
1232         union {
1233                 struct usb_ctrlrequest  r;
1234                 u8                      raw[8];
1235                 u32                     word[2];
1236         } u;
1237
1238         if (list_empty(&ep->queue))
1239                 req = NULL;
1240         else
1241                 req = list_entry(ep->queue.next, struct pxa25x_request, queue);
1242
1243         /* clear stall status */
1244         if (udccs0 & UDCCS0_SST) {
1245                 nuke(ep, -EPIPE);
1246                 writel(UDCCS0_SST, &dev->regs->udccs[0]);
1247                 stop_watchdog(dev);
1248                 ep0_idle(dev);
1249         }
1250
1251         /* previous request unfinished?  non-error iff back-to-back ... */
1252         if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) {
1253                 nuke(ep, 0);
1254                 stop_watchdog(dev);
1255                 ep0_idle(dev);
1256         }
1257
1258         switch (dev->ep0state) {
1259         case EP0_IDLE:
1260                 /* late-breaking status? */
1261                 udccs0 = readl(&dev->regs->udccs[0]);
1262
1263                 /* start control request? */
1264                 if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))
1265                                 == (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) {
1266                         int i;
1267
1268                         nuke(ep, -EPROTO);
1269
1270                         /* read SETUP packet */
1271                         for (i = 0; i < 8; i++) {
1272                                 if (unlikely(!(readl(&dev->regs->udccs[0]) &
1273                                                 UDCCS0_RNE))) {
1274 bad_setup:
1275                                         debug("SETUP %d!\n", i);
1276                                         goto stall;
1277                                 }
1278                                 u.raw[i] = (u8)readb(&dev->regs->uddr0);
1279                         }
1280                         if (unlikely((readl(&dev->regs->udccs[0]) &
1281                                         UDCCS0_RNE) != 0))
1282                                 goto bad_setup;
1283
1284 got_setup:
1285                         debug("SETUP %02x.%02x v%04x i%04x l%04x\n",
1286                                 u.r.bRequestType, u.r.bRequest,
1287                                 le16_to_cpu(u.r.wValue),
1288                                 le16_to_cpu(u.r.wIndex),
1289                                 le16_to_cpu(u.r.wLength));
1290
1291                         /* cope with automagic for some standard requests. */
1292                         dev->req_std = (u.r.bRequestType & USB_TYPE_MASK)
1293                                                 == USB_TYPE_STANDARD;
1294                         dev->req_config = 0;
1295                         dev->req_pending = 1;
1296                         switch (u.r.bRequest) {
1297                         /* hardware restricts gadget drivers here! */
1298                         case USB_REQ_SET_CONFIGURATION:
1299                                 debug("GOT SET_CONFIGURATION\n");
1300                                 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1301                                         /*
1302                                          * reflect hardware's automagic
1303                                          * up to the gadget driver.
1304                                          */
1305 config_change:
1306                                         dev->req_config = 1;
1307                                         clear_ep_state(dev);
1308                                         /*
1309                                          * if !has_cfr, there's no synch
1310                                          * else use AREN (later) not SA|OPR
1311                                          * USIR0_IR0 acts edge sensitive
1312                                          */
1313                                 }
1314                                 break;
1315                         /* ... and here, even more ... */
1316                         case USB_REQ_SET_INTERFACE:
1317                                 if (u.r.bRequestType == USB_RECIP_INTERFACE) {
1318                                         /*
1319                                          * udc hardware is broken by design:
1320                                          *  - altsetting may only be zero;
1321                                          *  - hw resets all interfaces' eps;
1322                                          *  - ep reset doesn't include halt(?).
1323                                          */
1324                                         printf("broken set_interface (%d/%d)\n",
1325                                                 le16_to_cpu(u.r.wIndex),
1326                                                 le16_to_cpu(u.r.wValue));
1327                                         goto config_change;
1328                                 }
1329                                 break;
1330                         /* hardware was supposed to hide this */
1331                         case USB_REQ_SET_ADDRESS:
1332                                 debug("GOT SET ADDRESS\n");
1333                                 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1334                                         ep0start(dev, 0, "address");
1335                                         return;
1336                                 }
1337                                 break;
1338                         }
1339
1340                         if (u.r.bRequestType & USB_DIR_IN)
1341                                 dev->ep0state = EP0_IN_DATA_PHASE;
1342                         else
1343                                 dev->ep0state = EP0_OUT_DATA_PHASE;
1344
1345                         i = dev->driver->setup(&dev->gadget, &u.r);
1346                         if (i < 0) {
1347                                 /* hardware automagic preventing STALL... */
1348                                 if (dev->req_config) {
1349                                         /*
1350                                          * hardware sometimes neglects to tell
1351                                          * tell us about config change events,
1352                                          * so later ones may fail...
1353                                          */
1354                                         printf("config change %02x fail %d?\n",
1355                                                 u.r.bRequest, i);
1356                                         return;
1357                                         /*
1358                                          * TODO experiment:  if has_cfr,
1359                                          * hardware didn't ACK; maybe we
1360                                          * could actually STALL!
1361                                          */
1362                                 }
1363                                 if (0) {
1364 stall:
1365                                         /* uninitialized when goto stall */
1366                                         i = 0;
1367                                 }
1368                                 debug("protocol STALL, "
1369                                         "%02x err %d\n",
1370                                         readl(&dev->regs->udccs[0]), i);
1371
1372                                 /*
1373                                  * the watchdog timer helps deal with cases
1374                                  * where udc seems to clear FST wrongly, and
1375                                  * then NAKs instead of STALLing.
1376                                  */
1377                                 ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall");
1378                                 start_watchdog(dev);
1379                                 dev->ep0state = EP0_STALL;
1380
1381                         /* deferred i/o == no response yet */
1382                         } else if (dev->req_pending) {
1383                                 if (likely(dev->ep0state == EP0_IN_DATA_PHASE
1384                                                 || dev->req_std || u.r.wLength))
1385                                         ep0start(dev, 0, "defer");
1386                                 else
1387                                         ep0start(dev, UDCCS0_IPR, "defer/IPR");
1388                         }
1389
1390                         /* expect at least one data or status stage irq */
1391                         return;
1392
1393                 } else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA))
1394                                 == (UDCCS0_OPR|UDCCS0_SA))) {
1395                         unsigned i;
1396
1397                         /*
1398                          * pxa210/250 erratum 131 for B0/B1 says RNE lies.
1399                          * still observed on a pxa255 a0.
1400                          */
1401                         debug("e131\n");
1402                         nuke(ep, -EPROTO);
1403
1404                         /* read SETUP data, but don't trust it too much */
1405                         for (i = 0; i < 8; i++)
1406                                 u.raw[i] = (u8)readb(&dev->regs->uddr0);
1407                         if ((u.r.bRequestType & USB_RECIP_MASK)
1408                                         > USB_RECIP_OTHER)
1409                                 goto stall;
1410                         if (u.word[0] == 0 && u.word[1] == 0)
1411                                 goto stall;
1412                         goto got_setup;
1413                 } else {
1414                         /*
1415                          * some random early IRQ:
1416                          * - we acked FST
1417                          * - IPR cleared
1418                          * - OPR got set, without SA (likely status stage)
1419                          */
1420                         debug("random IRQ %X %X\n", udccs0,
1421                                 readl(&dev->regs->udccs[0]));
1422                         writel(udccs0 & (UDCCS0_SA|UDCCS0_OPR),
1423                                 &dev->regs->udccs[0]);
1424                 }
1425                 break;
1426         case EP0_IN_DATA_PHASE:                 /* GET_DESCRIPTOR etc */
1427                 if (udccs0 & UDCCS0_OPR) {
1428                         debug("ep0in premature status\n");
1429                         if (req)
1430                                 done(ep, req, 0);
1431                         ep0_idle(dev);
1432                 } else /* irq was IPR clearing */ {
1433                         if (req) {
1434                                 debug("next ep0 in packet\n");
1435                                 /* this IN packet might finish the request */
1436                                 (void) write_ep0_fifo(ep, req);
1437                         } /* else IN token before response was written */
1438                 }
1439                 break;
1440         case EP0_OUT_DATA_PHASE:                /* SET_DESCRIPTOR etc */
1441                 if (udccs0 & UDCCS0_OPR) {
1442                         if (req) {
1443                                 /* this OUT packet might finish the request */
1444                                 if (read_ep0_fifo(ep, req))
1445                                         done(ep, req, 0);
1446                                 /* else more OUT packets expected */
1447                         } /* else OUT token before read was issued */
1448                 } else /* irq was IPR clearing */ {
1449                         debug("ep0out premature status\n");
1450                         if (req)
1451                                 done(ep, req, 0);
1452                         ep0_idle(dev);
1453                 }
1454                 break;
1455         case EP0_END_XFER:
1456                 if (req)
1457                         done(ep, req, 0);
1458                 /*
1459                  * ack control-IN status (maybe in-zlp was skipped)
1460                  * also appears after some config change events.
1461                  */
1462                 if (udccs0 & UDCCS0_OPR)
1463                         writel(UDCCS0_OPR, &dev->regs->udccs[0]);
1464                 ep0_idle(dev);
1465                 break;
1466         case EP0_STALL:
1467                 writel(UDCCS0_FST, &dev->regs->udccs[0]);
1468                 break;
1469         }
1470
1471         writel(USIR0_IR0, &dev->regs->usir0);
1472 }
1473
1474 static void handle_ep(struct pxa25x_ep *ep)
1475 {
1476         struct pxa25x_request   *req;
1477         int                     is_in = ep->bEndpointAddress & USB_DIR_IN;
1478         int                     completed;
1479         u32                     udccs, tmp;
1480
1481         do {
1482                 completed = 0;
1483                 if (likely(!list_empty(&ep->queue)))
1484                         req = list_entry(ep->queue.next,
1485                                         struct pxa25x_request, queue);
1486                 else
1487                         req = NULL;
1488
1489                 /* TODO check FST handling */
1490
1491                 udccs = readl(ep->reg_udccs);
1492                 if (unlikely(is_in)) {  /* irq from TPC, SST, or (ISO) TUR */
1493                         tmp = UDCCS_BI_TUR;
1494                         if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1495                                 tmp |= UDCCS_BI_SST;
1496                         tmp &= udccs;
1497                         if (likely(tmp))
1498                                 writel(tmp, ep->reg_udccs);
1499                         if (req && likely((udccs & UDCCS_BI_TFS) != 0))
1500                                 completed = write_fifo(ep, req);
1501
1502                 } else {        /* irq from RPC (or for ISO, ROF) */
1503                         if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1504                                 tmp = UDCCS_BO_SST | UDCCS_BO_DME;
1505                         else
1506                                 tmp = UDCCS_IO_ROF | UDCCS_IO_DME;
1507                         tmp &= udccs;
1508                         if (likely(tmp))
1509                                 writel(tmp, ep->reg_udccs);
1510
1511                         /* fifos can hold packets, ready for reading... */
1512                         if (likely(req))
1513                                 completed = read_fifo(ep, req);
1514                         else
1515                                 pio_irq_disable(ep->bEndpointAddress);
1516                 }
1517                 ep->pio_irqs++;
1518         } while (completed);
1519 }
1520
1521 /*
1522  *      pxa25x_udc_irq - interrupt handler
1523  *
1524  * avoid delays in ep0 processing. the control handshaking isn't always
1525  * under software control (pxa250c0 and the pxa255 are better), and delays
1526  * could cause usb protocol errors.
1527  */
1528 static struct pxa25x_udc memory;
1529 static int
1530 pxa25x_udc_irq(void)
1531 {
1532         struct pxa25x_udc *dev = &memory;
1533         int handled;
1534
1535         test_watchdog(dev);
1536
1537         dev->stats.irqs++;
1538         do {
1539                 u32 udccr = readl(&dev->regs->udccr);
1540
1541                 handled = 0;
1542
1543                 /* SUSpend Interrupt Request */
1544                 if (unlikely(udccr & UDCCR_SUSIR)) {
1545                         udc_ack_int_UDCCR(UDCCR_SUSIR);
1546                         handled = 1;
1547                         debug("USB suspend\n");
1548
1549                         if (dev->gadget.speed != USB_SPEED_UNKNOWN
1550                                         && dev->driver
1551                                         && dev->driver->suspend)
1552                                 dev->driver->suspend(&dev->gadget);
1553                         ep0_idle(dev);
1554                 }
1555
1556                 /* RESume Interrupt Request */
1557                 if (unlikely(udccr & UDCCR_RESIR)) {
1558                         udc_ack_int_UDCCR(UDCCR_RESIR);
1559                         handled = 1;
1560                         debug("USB resume\n");
1561
1562                         if (dev->gadget.speed != USB_SPEED_UNKNOWN
1563                                         && dev->driver
1564                                         && dev->driver->resume)
1565                                 dev->driver->resume(&dev->gadget);
1566                 }
1567
1568                 /* ReSeT Interrupt Request - USB reset */
1569                 if (unlikely(udccr & UDCCR_RSTIR)) {
1570                         udc_ack_int_UDCCR(UDCCR_RSTIR);
1571                         handled = 1;
1572
1573                         if ((readl(&dev->regs->udccr) & UDCCR_UDA) == 0) {
1574                                 debug("USB reset start\n");
1575
1576                                 /*
1577                                  * reset driver and endpoints,
1578                                  * in case that's not yet done
1579                                  */
1580                                 stop_activity(dev, dev->driver);
1581
1582                         } else {
1583                                 debug("USB reset end\n");
1584                                 dev->gadget.speed = USB_SPEED_FULL;
1585                                 memset(&dev->stats, 0, sizeof dev->stats);
1586                                 /* driver and endpoints are still reset */
1587                         }
1588
1589                 } else {
1590                         u32 uicr0 = readl(&dev->regs->uicr0);
1591                         u32 uicr1 = readl(&dev->regs->uicr1);
1592                         u32 usir0 = readl(&dev->regs->usir0);
1593                         u32 usir1 = readl(&dev->regs->usir1);
1594
1595                         usir0 = usir0 & ~uicr0;
1596                         usir1 = usir1 & ~uicr1;
1597                         int i;
1598
1599                         if (unlikely(!usir0 && !usir1))
1600                                 continue;
1601
1602                         debug_cond(NOISY, "irq %02x.%02x\n", usir1, usir0);
1603
1604                         /* control traffic */
1605                         if (usir0 & USIR0_IR0) {
1606                                 dev->ep[0].pio_irqs++;
1607                                 handle_ep0(dev);
1608                                 handled = 1;
1609                         }
1610
1611                         /* endpoint data transfers */
1612                         for (i = 0; i < 8; i++) {
1613                                 u32     tmp = 1 << i;
1614
1615                                 if (i && (usir0 & tmp)) {
1616                                         handle_ep(&dev->ep[i]);
1617                                         setbits_le32(&dev->regs->usir0, tmp);
1618                                         handled = 1;
1619                                 }
1620 #ifndef CONFIG_USB_PXA25X_SMALL
1621                                 if (usir1 & tmp) {
1622                                         handle_ep(&dev->ep[i+8]);
1623                                         setbits_le32(&dev->regs->usir1, tmp);
1624                                         handled = 1;
1625                                 }
1626 #endif
1627                         }
1628                 }
1629
1630                 /* we could also ask for 1 msec SOF (SIR) interrupts */
1631
1632         } while (handled);
1633         return IRQ_HANDLED;
1634 }
1635
1636 /*-------------------------------------------------------------------------*/
1637
1638 /*
1639  * this uses load-time allocation and initialization (instead of
1640  * doing it at run-time) to save code, eliminate fault paths, and
1641  * be more obviously correct.
1642  */
1643 static struct pxa25x_udc memory = {
1644         .regs = UDC_REGS,
1645
1646         .gadget = {
1647                 .ops            = &pxa25x_udc_ops,
1648                 .ep0            = &memory.ep[0].ep,
1649                 .name           = driver_name,
1650         },
1651
1652         /* control endpoint */
1653         .ep[0] = {
1654                 .ep = {
1655                         .name           = ep0name,
1656                         .ops            = &pxa25x_ep_ops,
1657                         .maxpacket      = EP0_FIFO_SIZE,
1658                 },
1659                 .dev            = &memory,
1660                 .reg_udccs      = &UDC_REGS->udccs[0],
1661                 .reg_uddr       = &UDC_REGS->uddr0,
1662         },
1663
1664         /* first group of endpoints */
1665         .ep[1] = {
1666                 .ep = {
1667                         .name           = "ep1in-bulk",
1668                         .ops            = &pxa25x_ep_ops,
1669                         .maxpacket      = BULK_FIFO_SIZE,
1670                 },
1671                 .dev            = &memory,
1672                 .fifo_size      = BULK_FIFO_SIZE,
1673                 .bEndpointAddress = USB_DIR_IN | 1,
1674                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1675                 .reg_udccs      = &UDC_REGS->udccs[1],
1676                 .reg_uddr       = &UDC_REGS->uddr1,
1677         },
1678         .ep[2] = {
1679                 .ep = {
1680                         .name           = "ep2out-bulk",
1681                         .ops            = &pxa25x_ep_ops,
1682                         .maxpacket      = BULK_FIFO_SIZE,
1683                 },
1684                 .dev            = &memory,
1685                 .fifo_size      = BULK_FIFO_SIZE,
1686                 .bEndpointAddress = 2,
1687                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1688                 .reg_udccs      = &UDC_REGS->udccs[2],
1689                 .reg_ubcr       = &UDC_REGS->ubcr2,
1690                 .reg_uddr       = &UDC_REGS->uddr2,
1691         },
1692 #ifndef CONFIG_USB_PXA25X_SMALL
1693         .ep[3] = {
1694                 .ep = {
1695                         .name           = "ep3in-iso",
1696                         .ops            = &pxa25x_ep_ops,
1697                         .maxpacket      = ISO_FIFO_SIZE,
1698                 },
1699                 .dev            = &memory,
1700                 .fifo_size      = ISO_FIFO_SIZE,
1701                 .bEndpointAddress = USB_DIR_IN | 3,
1702                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1703                 .reg_udccs      = &UDC_REGS->udccs[3],
1704                 .reg_uddr       = &UDC_REGS->uddr3,
1705         },
1706         .ep[4] = {
1707                 .ep = {
1708                         .name           = "ep4out-iso",
1709                         .ops            = &pxa25x_ep_ops,
1710                         .maxpacket      = ISO_FIFO_SIZE,
1711                 },
1712                 .dev            = &memory,
1713                 .fifo_size      = ISO_FIFO_SIZE,
1714                 .bEndpointAddress = 4,
1715                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1716                 .reg_udccs      = &UDC_REGS->udccs[4],
1717                 .reg_ubcr       = &UDC_REGS->ubcr4,
1718                 .reg_uddr       = &UDC_REGS->uddr4,
1719         },
1720         .ep[5] = {
1721                 .ep = {
1722                         .name           = "ep5in-int",
1723                         .ops            = &pxa25x_ep_ops,
1724                         .maxpacket      = INT_FIFO_SIZE,
1725                 },
1726                 .dev            = &memory,
1727                 .fifo_size      = INT_FIFO_SIZE,
1728                 .bEndpointAddress = USB_DIR_IN | 5,
1729                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
1730                 .reg_udccs      = &UDC_REGS->udccs[5],
1731                 .reg_uddr       = &UDC_REGS->uddr5,
1732         },
1733
1734         /* second group of endpoints */
1735         .ep[6] = {
1736                 .ep = {
1737                         .name           = "ep6in-bulk",
1738                         .ops            = &pxa25x_ep_ops,
1739                         .maxpacket      = BULK_FIFO_SIZE,
1740                 },
1741                 .dev            = &memory,
1742                 .fifo_size      = BULK_FIFO_SIZE,
1743                 .bEndpointAddress = USB_DIR_IN | 6,
1744                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1745                 .reg_udccs      = &UDC_REGS->udccs[6],
1746                 .reg_uddr       = &UDC_REGS->uddr6,
1747         },
1748         .ep[7] = {
1749                 .ep = {
1750                         .name           = "ep7out-bulk",
1751                         .ops            = &pxa25x_ep_ops,
1752                         .maxpacket      = BULK_FIFO_SIZE,
1753                 },
1754                 .dev            = &memory,
1755                 .fifo_size      = BULK_FIFO_SIZE,
1756                 .bEndpointAddress = 7,
1757                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1758                 .reg_udccs      = &UDC_REGS->udccs[7],
1759                 .reg_ubcr       = &UDC_REGS->ubcr7,
1760                 .reg_uddr       = &UDC_REGS->uddr7,
1761         },
1762         .ep[8] = {
1763                 .ep = {
1764                         .name           = "ep8in-iso",
1765                         .ops            = &pxa25x_ep_ops,
1766                         .maxpacket      = ISO_FIFO_SIZE,
1767                 },
1768                 .dev            = &memory,
1769                 .fifo_size      = ISO_FIFO_SIZE,
1770                 .bEndpointAddress = USB_DIR_IN | 8,
1771                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1772                 .reg_udccs      = &UDC_REGS->udccs[8],
1773                 .reg_uddr       = &UDC_REGS->uddr8,
1774         },
1775         .ep[9] = {
1776                 .ep = {
1777                         .name           = "ep9out-iso",
1778                         .ops            = &pxa25x_ep_ops,
1779                         .maxpacket      = ISO_FIFO_SIZE,
1780                 },
1781                 .dev            = &memory,
1782                 .fifo_size      = ISO_FIFO_SIZE,
1783                 .bEndpointAddress = 9,
1784                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1785                 .reg_udccs      = &UDC_REGS->udccs[9],
1786                 .reg_ubcr       = &UDC_REGS->ubcr9,
1787                 .reg_uddr       = &UDC_REGS->uddr9,
1788         },
1789         .ep[10] = {
1790                 .ep = {
1791                         .name           = "ep10in-int",
1792                         .ops            = &pxa25x_ep_ops,
1793                         .maxpacket      = INT_FIFO_SIZE,
1794                 },
1795                 .dev            = &memory,
1796                 .fifo_size      = INT_FIFO_SIZE,
1797                 .bEndpointAddress = USB_DIR_IN | 10,
1798                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
1799                 .reg_udccs      = &UDC_REGS->udccs[10],
1800                 .reg_uddr       = &UDC_REGS->uddr10,
1801         },
1802
1803         /* third group of endpoints */
1804         .ep[11] = {
1805                 .ep = {
1806                         .name           = "ep11in-bulk",
1807                         .ops            = &pxa25x_ep_ops,
1808                         .maxpacket      = BULK_FIFO_SIZE,
1809                 },
1810                 .dev            = &memory,
1811                 .fifo_size      = BULK_FIFO_SIZE,
1812                 .bEndpointAddress = USB_DIR_IN | 11,
1813                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1814                 .reg_udccs      = &UDC_REGS->udccs[11],
1815                 .reg_uddr       = &UDC_REGS->uddr11,
1816         },
1817         .ep[12] = {
1818                 .ep = {
1819                         .name           = "ep12out-bulk",
1820                         .ops            = &pxa25x_ep_ops,
1821                         .maxpacket      = BULK_FIFO_SIZE,
1822                 },
1823                 .dev            = &memory,
1824                 .fifo_size      = BULK_FIFO_SIZE,
1825                 .bEndpointAddress = 12,
1826                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1827                 .reg_udccs      = &UDC_REGS->udccs[12],
1828                 .reg_ubcr       = &UDC_REGS->ubcr12,
1829                 .reg_uddr       = &UDC_REGS->uddr12,
1830         },
1831         .ep[13] = {
1832                 .ep = {
1833                         .name           = "ep13in-iso",
1834                         .ops            = &pxa25x_ep_ops,
1835                         .maxpacket      = ISO_FIFO_SIZE,
1836                 },
1837                 .dev            = &memory,
1838                 .fifo_size      = ISO_FIFO_SIZE,
1839                 .bEndpointAddress = USB_DIR_IN | 13,
1840                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1841                 .reg_udccs      = &UDC_REGS->udccs[13],
1842                 .reg_uddr       = &UDC_REGS->uddr13,
1843         },
1844         .ep[14] = {
1845                 .ep = {
1846                         .name           = "ep14out-iso",
1847                         .ops            = &pxa25x_ep_ops,
1848                         .maxpacket      = ISO_FIFO_SIZE,
1849                 },
1850                 .dev            = &memory,
1851                 .fifo_size      = ISO_FIFO_SIZE,
1852                 .bEndpointAddress = 14,
1853                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1854                 .reg_udccs      = &UDC_REGS->udccs[14],
1855                 .reg_ubcr       = &UDC_REGS->ubcr14,
1856                 .reg_uddr       = &UDC_REGS->uddr14,
1857         },
1858         .ep[15] = {
1859                 .ep = {
1860                         .name           = "ep15in-int",
1861                         .ops            = &pxa25x_ep_ops,
1862                         .maxpacket      = INT_FIFO_SIZE,
1863                 },
1864                 .dev            = &memory,
1865                 .fifo_size      = INT_FIFO_SIZE,
1866                 .bEndpointAddress = USB_DIR_IN | 15,
1867                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
1868                 .reg_udccs      = &UDC_REGS->udccs[15],
1869                 .reg_uddr       = &UDC_REGS->uddr15,
1870         },
1871 #endif /* !CONFIG_USB_PXA25X_SMALL */
1872 };
1873
1874 static void udc_command(int cmd)
1875 {
1876         switch (cmd) {
1877         case PXA2XX_UDC_CMD_CONNECT:
1878                 setbits_le32(GPDR(CONFIG_USB_DEV_PULLUP_GPIO),
1879                         GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO));
1880
1881                 /* enable pullup */
1882                 writel(GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO),
1883                         GPCR(CONFIG_USB_DEV_PULLUP_GPIO));
1884
1885                 debug("Connected to USB\n");
1886                 break;
1887
1888         case PXA2XX_UDC_CMD_DISCONNECT:
1889                 /* disable pullup resistor */
1890                 writel(GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO),
1891                         GPSR(CONFIG_USB_DEV_PULLUP_GPIO));
1892
1893                 /* setup pin as input, line will float */
1894                 clrbits_le32(GPDR(CONFIG_USB_DEV_PULLUP_GPIO),
1895                         GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO));
1896
1897                 debug("Disconnected from USB\n");
1898                 break;
1899         }
1900 }
1901
1902 static struct pxa2xx_udc_mach_info mach_info = {
1903         .udc_command = udc_command,
1904 };
1905
1906 /*
1907  * when a driver is successfully registered, it will receive
1908  * control requests including set_configuration(), which enables
1909  * non-control requests.  then usb traffic follows until a
1910  * disconnect is reported.  then a host may connect again, or
1911  * the driver might get unbound.
1912  */
1913 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1914 {
1915         struct pxa25x_udc *dev = &memory;
1916         int retval;
1917         uint32_t chiprev;
1918
1919         if (!driver
1920                         || driver->speed < USB_SPEED_FULL
1921                         || !driver->disconnect
1922                         || !driver->setup)
1923                 return -EINVAL;
1924         if (!dev)
1925                 return -ENODEV;
1926         if (dev->driver)
1927                 return -EBUSY;
1928
1929         /* Enable clock for usb controller */
1930         setbits_le32(CKEN, CKEN11_USB);
1931
1932         /* first hook up the driver ... */
1933         dev->driver = driver;
1934         dev->pullup = 1;
1935
1936         /* trigger chiprev-specific logic */
1937         switch ((chiprev = pxa_get_cpu_revision())) {
1938         case PXA255_A0:
1939                 dev->has_cfr = 1;
1940                 break;
1941         case PXA250_A0:
1942         case PXA250_A1:
1943                 /* A0/A1 "not released"; ep 13, 15 unusable */
1944                 /* fall through */
1945         case PXA250_B2: case PXA210_B2:
1946         case PXA250_B1: case PXA210_B1:
1947         case PXA250_B0: case PXA210_B0:
1948                 /* OUT-DMA is broken ... */
1949                 /* fall through */
1950         case PXA250_C0: case PXA210_C0:
1951                 break;
1952         default:
1953                 printf("%s: unrecognized processor: %08x\n",
1954                         DRIVER_NAME, chiprev);
1955                 return -ENODEV;
1956         }
1957
1958         the_controller = dev;
1959
1960         /* prepare watchdog timer */
1961         dev->watchdog.running = 0;
1962         dev->watchdog.period = 5000 * CONFIG_SYS_HZ / 1000000; /* 5 ms */
1963         dev->watchdog.function = udc_watchdog;
1964
1965         udc_disable(dev);
1966         udc_reinit(dev);
1967
1968         dev->mach = &mach_info;
1969
1970         dev->gadget.name = "pxa2xx_udc";
1971         retval = driver->bind(&dev->gadget);
1972         if (retval) {
1973                 printf("bind to driver %s --> error %d\n",
1974                                 DRIVER_NAME, retval);
1975                 dev->driver = NULL;
1976                 return retval;
1977         }
1978
1979         /*
1980          * ... then enable host detection and ep0; and we're ready
1981          * for set_configuration as well as eventual disconnect.
1982          */
1983         printf("registered gadget driver '%s'\n", DRIVER_NAME);
1984
1985         pullup(dev);
1986         dump_state(dev);
1987         return 0;
1988 }
1989
1990 static void
1991 stop_activity(struct pxa25x_udc *dev, struct usb_gadget_driver *driver)
1992 {
1993         int i;
1994
1995         /* don't disconnect drivers more than once */
1996         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1997                 driver = NULL;
1998         dev->gadget.speed = USB_SPEED_UNKNOWN;
1999
2000         /* prevent new request submissions, kill any outstanding requests  */
2001         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
2002                 struct pxa25x_ep *ep = &dev->ep[i];
2003
2004                 ep->stopped = 1;
2005                 nuke(ep, -ESHUTDOWN);
2006         }
2007         stop_watchdog(dev);
2008
2009         /* report disconnect; the driver is already quiesced */
2010         if (driver)
2011                 driver->disconnect(&dev->gadget);
2012
2013         /* re-init driver-visible data structures */
2014         udc_reinit(dev);
2015 }
2016
2017 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
2018 {
2019         struct pxa25x_udc       *dev = the_controller;
2020
2021         if (!dev)
2022                 return -ENODEV;
2023         if (!driver || driver != dev->driver || !driver->unbind)
2024                 return -EINVAL;
2025
2026         local_irq_disable();
2027         dev->pullup = 0;
2028         pullup(dev);
2029         stop_activity(dev, driver);
2030         local_irq_enable();
2031
2032         driver->unbind(&dev->gadget);
2033         dev->driver = NULL;
2034
2035         printf("unregistered gadget driver '%s'\n", DRIVER_NAME);
2036         dump_state(dev);
2037
2038         the_controller = NULL;
2039
2040         clrbits_le32(CKEN, CKEN11_USB);
2041
2042         return 0;
2043 }
2044
2045 extern void udc_disconnect(void)
2046 {
2047         setbits_le32(CKEN, CKEN11_USB);
2048         udc_clear_mask_UDCCR(UDCCR_UDE);
2049         udc_command(PXA2XX_UDC_CMD_DISCONNECT);
2050         clrbits_le32(CKEN, CKEN11_USB);
2051 }
2052
2053 /*-------------------------------------------------------------------------*/
2054
2055 extern int
2056 usb_gadget_handle_interrupts(void)
2057 {
2058         return pxa25x_udc_irq();
2059 }