drivers/usb/gadget/pxa2xx_udc.c

   1 /*
   2  * linux/drivers/usb/gadget/pxa2xx_udc.c
   3  * Intel PXA25x and IXP4xx on-chip full speed USB device controllers
   4  *
   5  * Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker)
   6  * Copyright (C) 2003 Robert Schwebel, Pengutronix
   7  * Copyright (C) 2003 Benedikt Spranger, Pengutronix
   8  * Copyright (C) 2003 David Brownell
   9  * Copyright (C) 2003 Joshua Wise
  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  */
  26
  27 /* #define VERBOSE_DEBUG */
  28
  29 #include <linux/device.h>
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/ioport.h>
  33 #include <linux/types.h>
  34 #include <linux/errno.h>
  35 #include <linux/delay.h>
  36 #include <linux/slab.h>
  37 #include <linux/init.h>
  38 #include <linux/timer.h>
  39 #include <linux/list.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/mm.h>
  42 #include <linux/platform_device.h>
  43 #include <linux/dma-mapping.h>
  44 #include <linux/irq.h>
  45 #include <linux/clk.h>
  46 #include <linux/err.h>
  47 #include <linux/seq_file.h>
  48 #include <linux/debugfs.h>
  49
  50 #include <asm/byteorder.h>
  51 #include <asm/dma.h>
  52 #include <asm/gpio.h>
  53 #include <asm/io.h>
  54 #include <asm/system.h>
  55 #include <asm/mach-types.h>
  56 #include <asm/unaligned.h>
  57 #include <asm/hardware.h>
  58
  59 #include <linux/usb/ch9.h>
  60 #include <linux/usb/gadget.h>
  61
  62 #include <asm/mach/udc_pxa2xx.h>
  63
  64
  65 /*
  66  * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x
  67  * series processors.  The UDC for the IXP 4xx series is very similar.
  68  * There are fifteen endpoints, in addition to ep0.
  69  *
  70  * Such controller drivers work with a gadget driver.  The gadget driver
  71  * returns descriptors, implements configuration and data protocols used
  72  * by the host to interact with this device, and allocates endpoints to
  73  * the different protocol interfaces.  The controller driver virtualizes
  74  * usb hardware so that the gadget drivers will be more portable.
  75  *
  76  * This UDC hardware wants to implement a bit too much USB protocol, so
  77  * it constrains the sorts of USB configuration change events that work.
  78  * The errata for these chips are misleading; some "fixed" bugs from
  79  * pxa250 a0/a1 b0/b1/b2 sure act like they're still there.
  80  *
  81  * Note that the UDC hardware supports DMA (except on IXP) but that's
  82  * not used here.  IN-DMA (to host) is simple enough, when the data is
  83  * suitably aligned (16 bytes) ... the network stack doesn't do that,
  84  * other software can.  OUT-DMA is buggy in most chip versions, as well
  85  * as poorly designed (data toggle not automatic).  So this driver won't
  86  * bother using DMA.  (Mostly-working IN-DMA support was available in
  87  * kernels before 2.6.23, but was never enabled or well tested.)
  88  */
  89
  90 #define DRIVER_VERSION  "30-June-2007"
  91 #define DRIVER_DESC     "PXA 25x USB Device Controller driver"
  92
  93
  94 static const char driver_name [] = "pxa2xx_udc";
  95
  96 static const char ep0name [] = "ep0";
  97
  98
  99 #ifdef CONFIG_ARCH_IXP4XX
 100
 101 /* cpu-specific register addresses are compiled in to this code */
 102 #ifdef CONFIG_ARCH_PXA
 103 #error "Can't configure both IXP and PXA"
 104 #endif
 105
 106 #endif
 107
 108 #include "pxa2xx_udc.h"
 109
 110
 111 #ifdef  CONFIG_USB_PXA2XX_SMALL
 112 #define SIZE_STR        " (small)"
 113 #else
 114 #define SIZE_STR        ""
 115 #endif
 116
 117 /* ---------------------------------------------------------------------------
 118  *      endpoint related parts of the api to the usb controller hardware,
 119  *      used by gadget driver; and the inner talker-to-hardware core.
 120  * ---------------------------------------------------------------------------
 121  */
 122
 123 static void pxa2xx_ep_fifo_flush (struct usb_ep *ep);
 124 static void nuke (struct pxa2xx_ep *, int status);
 125
 126 /* one GPIO should be used to detect VBUS from the host */
 127 static int is_vbus_present(void)
 128 {
 129         struct pxa2xx_udc_mach_info             *mach = the_controller->mach;
 130
 131         if (mach->gpio_vbus) {
 132                 int value = gpio_get_value(mach->gpio_vbus);
 133                 return mach->gpio_vbus_inverted ? !value : value;
 134         }
 135         if (mach->udc_is_connected)
 136                 return mach->udc_is_connected();
 137         return 1;
 138 }
 139
 140 /* one GPIO should control a D+ pullup, so host sees this device (or not) */
 141 static void pullup_off(void)
 142 {
 143         struct pxa2xx_udc_mach_info             *mach = the_controller->mach;
 144
 145         if (mach->gpio_pullup)
 146                 gpio_set_value(mach->gpio_pullup, 0);
 147         else if (mach->udc_command)
 148                 mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
 149 }
 150
 151 static void pullup_on(void)
 152 {
 153         struct pxa2xx_udc_mach_info             *mach = the_controller->mach;
 154
 155         if (mach->gpio_pullup)
 156                 gpio_set_value(mach->gpio_pullup, 1);
 157         else if (mach->udc_command)
 158                 mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
 159 }
 160
 161 static void pio_irq_enable(int bEndpointAddress)
 162 {
 163         bEndpointAddress &= 0xf;
 164         if (bEndpointAddress < 8)
 165                 UICR0 &= ~(1 << bEndpointAddress);
 166         else {
 167                 bEndpointAddress -= 8;
 168                 UICR1 &= ~(1 << bEndpointAddress);
 169         }
 170 }
 171
 172 static void pio_irq_disable(int bEndpointAddress)
 173 {
 174         bEndpointAddress &= 0xf;
 175         if (bEndpointAddress < 8)
 176                 UICR0 |= 1 << bEndpointAddress;
 177         else {
 178                 bEndpointAddress -= 8;
 179                 UICR1 |= 1 << bEndpointAddress;
 180         }
 181 }
 182
 183 /* The UDCCR reg contains mask and interrupt status bits,
 184  * so using '|=' isn't safe as it may ack an interrupt.
 185  */
 186 #define UDCCR_MASK_BITS         (UDCCR_REM | UDCCR_SRM | UDCCR_UDE)
 187
 188 static inline void udc_set_mask_UDCCR(int mask)
 189 {
 190         UDCCR = (UDCCR & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS);
 191 }
 192
 193 static inline void udc_clear_mask_UDCCR(int mask)
 194 {
 195         UDCCR = (UDCCR & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS);
 196 }
 197
 198 static inline void udc_ack_int_UDCCR(int mask)
 199 {
 200         /* udccr contains the bits we dont want to change */
 201         __u32 udccr = UDCCR & UDCCR_MASK_BITS;
 202
 203         UDCCR = udccr | (mask & ~UDCCR_MASK_BITS);
 204 }
 205
 206 /*
 207  * endpoint enable/disable
 208  *
 209  * we need to verify the descriptors used to enable endpoints.  since pxa2xx
 210  * endpoint configurations are fixed, and are pretty much always enabled,
 211  * there's not a lot to manage here.
 212  *
 213  * because pxa2xx can't selectively initialize bulk (or interrupt) endpoints,
 214  * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except
 215  * for a single interface (with only the default altsetting) and for gadget
 216  * drivers that don't halt endpoints (not reset by set_interface).  that also
 217  * means that if you use ISO, you must violate the USB spec rule that all
 218  * iso endpoints must be in non-default altsettings.
 219  */
 220 static int pxa2xx_ep_enable (struct usb_ep *_ep,
 221                 const struct usb_endpoint_descriptor *desc)
 222 {
 223         struct pxa2xx_ep        *ep;
 224         struct pxa2xx_udc       *dev;
 225
 226         ep = container_of (_ep, struct pxa2xx_ep, ep);
 227         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 228                         || desc->bDescriptorType != USB_DT_ENDPOINT
 229                         || ep->bEndpointAddress != desc->bEndpointAddress
 230                         || ep->fifo_size < le16_to_cpu
 231                                                 (desc->wMaxPacketSize)) {
 232                 DMSG("%s, bad ep or descriptor\n", __FUNCTION__);
 233                 return -EINVAL;
 234         }
 235
 236         /* xfer types must match, except that interrupt ~= bulk */
 237         if (ep->bmAttributes != desc->bmAttributes
 238                         && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 239                         && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 240                 DMSG("%s, %s type mismatch\n", __FUNCTION__, _ep->name);
 241                 return -EINVAL;
 242         }
 243
 244         /* hardware _could_ do smaller, but driver doesn't */
 245         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 246                                 && le16_to_cpu (desc->wMaxPacketSize)
 247                                                 != BULK_FIFO_SIZE)
 248                         || !desc->wMaxPacketSize) {
 249                 DMSG("%s, bad %s maxpacket\n", __FUNCTION__, _ep->name);
 250                 return -ERANGE;
 251         }
 252
 253         dev = ep->dev;
 254         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 255                 DMSG("%s, bogus device state\n", __FUNCTION__);
 256                 return -ESHUTDOWN;
 257         }
 258
 259         ep->desc = desc;
 260         ep->stopped = 0;
 261         ep->pio_irqs = 0;
 262         ep->ep.maxpacket = le16_to_cpu (desc->wMaxPacketSize);
 263
 264         /* flush fifo (mostly for OUT buffers) */
 265         pxa2xx_ep_fifo_flush (_ep);
 266
 267         /* ... reset halt state too, if we could ... */
 268
 269         DBG(DBG_VERBOSE, "enabled %s\n", _ep->name);
 270         return 0;
 271 }
 272
 273 static int pxa2xx_ep_disable (struct usb_ep *_ep)
 274 {
 275         struct pxa2xx_ep        *ep;
 276         unsigned long           flags;
 277
 278         ep = container_of (_ep, struct pxa2xx_ep, ep);
 279         if (!_ep || !ep->desc) {
 280                 DMSG("%s, %s not enabled\n", __FUNCTION__,
 281                         _ep ? ep->ep.name : NULL);
 282                 return -EINVAL;
 283         }
 284         local_irq_save(flags);
 285
 286         nuke (ep, -ESHUTDOWN);
 287
 288         /* flush fifo (mostly for IN buffers) */
 289         pxa2xx_ep_fifo_flush (_ep);
 290
 291         ep->desc = NULL;
 292         ep->stopped = 1;
 293
 294         local_irq_restore(flags);
 295         DBG(DBG_VERBOSE, "%s disabled\n", _ep->name);
 296         return 0;
 297 }
 298
 299 /*-------------------------------------------------------------------------*/
 300
 301 /* for the pxa2xx, these can just wrap kmalloc/kfree.  gadget drivers
 302  * must still pass correctly initialized endpoints, since other controller
 303  * drivers may care about how it's currently set up (dma issues etc).
 304  */
 305
 306 /*
 307  *      pxa2xx_ep_alloc_request - allocate a request data structure
 308  */
 309 static struct usb_request *
 310 pxa2xx_ep_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
 311 {
 312         struct pxa2xx_request *req;
 313
 314         req = kzalloc(sizeof(*req), gfp_flags);
 315         if (!req)
 316                 return NULL;
 317
 318         INIT_LIST_HEAD (&req->queue);
 319         return &req->req;
 320 }
 321
 322
 323 /*
 324  *      pxa2xx_ep_free_request - deallocate a request data structure
 325  */
 326 static void
 327 pxa2xx_ep_free_request (struct usb_ep *_ep, struct usb_request *_req)
 328 {
 329         struct pxa2xx_request   *req;
 330
 331         req = container_of (_req, struct pxa2xx_request, req);
 332         WARN_ON (!list_empty (&req->queue));
 333         kfree(req);
 334 }
 335
 336 /*-------------------------------------------------------------------------*/
 337
 338 /*
 339  *      done - retire a request; caller blocked irqs
 340  */
 341 static void done(struct pxa2xx_ep *ep, struct pxa2xx_request *req, int status)
 342 {
 343         unsigned                stopped = ep->stopped;
 344
 345         list_del_init(&req->queue);
 346
 347         if (likely (req->req.status == -EINPROGRESS))
 348                 req->req.status = status;
 349         else
 350                 status = req->req.status;
 351
 352         if (status && status != -ESHUTDOWN)
 353                 DBG(DBG_VERBOSE, "complete %s req %p stat %d len %u/%u\n",
 354                         ep->ep.name, &req->req, status,
 355                         req->req.actual, req->req.length);
 356
 357         /* don't modify queue heads during completion callback */
 358         ep->stopped = 1;
 359         req->req.complete(&ep->ep, &req->req);
 360         ep->stopped = stopped;
 361 }
 362
 363
 364 static inline void ep0_idle (struct pxa2xx_udc *dev)
 365 {
 366         dev->ep0state = EP0_IDLE;
 367 }
 368
 369 static int
 370 write_packet(volatile u32 *uddr, struct pxa2xx_request *req, unsigned max)
 371 {
 372         u8              *buf;
 373         unsigned        length, count;
 374
 375         buf = req->req.buf + req->req.actual;
 376         prefetch(buf);
 377
 378         /* how big will this packet be? */
 379         length = min(req->req.length - req->req.actual, max);
 380         req->req.actual += length;
 381
 382         count = length;
 383         while (likely(count--))
 384                 *uddr = *buf++;
 385
 386         return length;
 387 }
 388
 389 /*
 390  * write to an IN endpoint fifo, as many packets as possible.
 391  * irqs will use this to write the rest later.
 392  * caller guarantees at least one packet buffer is ready (or a zlp).
 393  */
 394 static int
 395 write_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
 396 {
 397         unsigned                max;
 398
 399         max = le16_to_cpu(ep->desc->wMaxPacketSize);
 400         do {
 401                 unsigned        count;
 402                 int             is_last, is_short;
 403
 404                 count = write_packet(ep->reg_uddr, req, max);
 405
 406                 /* last packet is usually short (or a zlp) */
 407                 if (unlikely (count != max))
 408                         is_last = is_short = 1;
 409                 else {
 410                         if (likely(req->req.length != req->req.actual)
 411                                         || req->req.zero)
 412                                 is_last = 0;
 413                         else
 414                                 is_last = 1;
 415                         /* interrupt/iso maxpacket may not fill the fifo */
 416                         is_short = unlikely (max < ep->fifo_size);
 417                 }
 418
 419                 DBG(DBG_VERY_NOISY, "wrote %s %d bytes%s%s %d left %p\n",
 420                         ep->ep.name, count,
 421                         is_last ? "/L" : "", is_short ? "/S" : "",
 422                         req->req.length - req->req.actual, req);
 423
 424                 /* let loose that packet. maybe try writing another one,
 425                  * double buffering might work.  TSP, TPC, and TFS
 426                  * bit values are the same for all normal IN endpoints.
 427                  */
 428                 *ep->reg_udccs = UDCCS_BI_TPC;
 429                 if (is_short)
 430                         *ep->reg_udccs = UDCCS_BI_TSP;
 431
 432                 /* requests complete when all IN data is in the FIFO */
 433                 if (is_last) {
 434                         done (ep, req, 0);
 435                         if (list_empty(&ep->queue))
 436                                 pio_irq_disable (ep->bEndpointAddress);
 437                         return 1;
 438                 }
 439
 440                 // TODO experiment: how robust can fifo mode tweaking be?
 441                 // double buffering is off in the default fifo mode, which
 442                 // prevents TFS from being set here.
 443
 444         } while (*ep->reg_udccs & UDCCS_BI_TFS);
 445         return 0;
 446 }
 447
 448 /* caller asserts req->pending (ep0 irq status nyet cleared); starts
 449  * ep0 data stage.  these chips want very simple state transitions.
 450  */
 451 static inline
 452 void ep0start(struct pxa2xx_udc *dev, u32 flags, const char *tag)
 453 {
 454         UDCCS0 = flags|UDCCS0_SA|UDCCS0_OPR;
 455         USIR0 = USIR0_IR0;
 456         dev->req_pending = 0;
 457         DBG(DBG_VERY_NOISY, "%s %s, %02x/%02x\n",
 458                 __FUNCTION__, tag, UDCCS0, flags);
 459 }
 460
 461 static int
 462 write_ep0_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
 463 {
 464         unsigned        count;
 465         int             is_short;
 466
 467         count = write_packet(&UDDR0, req, EP0_FIFO_SIZE);
 468         ep->dev->stats.write.bytes += count;
 469
 470         /* last packet "must be" short (or a zlp) */
 471         is_short = (count != EP0_FIFO_SIZE);
 472
 473         DBG(DBG_VERY_NOISY, "ep0in %d bytes %d left %p\n", count,
 474                 req->req.length - req->req.actual, req);
 475
 476         if (unlikely (is_short)) {
 477                 if (ep->dev->req_pending)
 478                         ep0start(ep->dev, UDCCS0_IPR, "short IN");
 479                 else
 480                         UDCCS0 = UDCCS0_IPR;
 481
 482                 count = req->req.length;
 483                 done (ep, req, 0);
 484                 ep0_idle(ep->dev);
 485 #ifndef CONFIG_ARCH_IXP4XX
 486 #if 1
 487                 /* This seems to get rid of lost status irqs in some cases:
 488                  * host responds quickly, or next request involves config
 489                  * change automagic, or should have been hidden, or ...
 490                  *
 491                  * FIXME get rid of all udelays possible...
 492                  */
 493                 if (count >= EP0_FIFO_SIZE) {
 494                         count = 100;
 495                         do {
 496                                 if ((UDCCS0 & UDCCS0_OPR) != 0) {
 497                                         /* clear OPR, generate ack */
 498                                         UDCCS0 = UDCCS0_OPR;
 499                                         break;
 500                                 }
 501                                 count--;
 502                                 udelay(1);
 503                         } while (count);
 504                 }
 505 #endif
 506 #endif
 507         } else if (ep->dev->req_pending)
 508                 ep0start(ep->dev, 0, "IN");
 509         return is_short;
 510 }
 511
 512
 513 /*
 514  * read_fifo -  unload packet(s) from the fifo we use for usb OUT
 515  * transfers and put them into the request.  caller should have made
 516  * sure there's at least one packet ready.
 517  *
 518  * returns true if the request completed because of short packet or the
 519  * request buffer having filled (and maybe overran till end-of-packet).
 520  */
 521 static int
 522 read_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
 523 {
 524         for (;;) {
 525                 u32             udccs;
 526                 u8              *buf;
 527                 unsigned        bufferspace, count, is_short;
 528
 529                 /* make sure there's a packet in the FIFO.
 530                  * UDCCS_{BO,IO}_RPC are all the same bit value.
 531                  * UDCCS_{BO,IO}_RNE are all the same bit value.
 532                  */
 533                 udccs = *ep->reg_udccs;
 534                 if (unlikely ((udccs & UDCCS_BO_RPC) == 0))
 535                         break;
 536                 buf = req->req.buf + req->req.actual;
 537                 prefetchw(buf);
 538                 bufferspace = req->req.length - req->req.actual;
 539
 540                 /* read all bytes from this packet */
 541                 if (likely (udccs & UDCCS_BO_RNE)) {
 542                         count = 1 + (0x0ff & *ep->reg_ubcr);
 543                         req->req.actual += min (count, bufferspace);
 544                 } else /* zlp */
 545                         count = 0;
 546                 is_short = (count < ep->ep.maxpacket);
 547                 DBG(DBG_VERY_NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n",
 548                         ep->ep.name, udccs, count,
 549                         is_short ? "/S" : "",
 550                         req, req->req.actual, req->req.length);
 551                 while (likely (count-- != 0)) {
 552                         u8      byte = (u8) *ep->reg_uddr;
 553
 554                         if (unlikely (bufferspace == 0)) {
 555                                 /* this happens when the driver's buffer
 556                                  * is smaller than what the host sent.
 557                                  * discard the extra data.
 558                                  */
 559                                 if (req->req.status != -EOVERFLOW)
 560                                         DMSG("%s overflow %d\n",
 561                                                 ep->ep.name, count);
 562                                 req->req.status = -EOVERFLOW;
 563                         } else {
 564                                 *buf++ = byte;
 565                                 bufferspace--;
 566                         }
 567                 }
 568                 *ep->reg_udccs =  UDCCS_BO_RPC;
 569                 /* RPC/RSP/RNE could now reflect the other packet buffer */
 570
 571                 /* iso is one request per packet */
 572                 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 573                         if (udccs & UDCCS_IO_ROF)
 574                                 req->req.status = -EHOSTUNREACH;
 575                         /* more like "is_done" */
 576                         is_short = 1;
 577                 }
 578
 579                 /* completion */
 580                 if (is_short || req->req.actual == req->req.length) {
 581                         done (ep, req, 0);
 582                         if (list_empty(&ep->queue))
 583                                 pio_irq_disable (ep->bEndpointAddress);
 584                         return 1;
 585                 }
 586
 587                 /* finished that packet.  the next one may be waiting... */
 588         }
 589         return 0;
 590 }
 591
 592 /*
 593  * special ep0 version of the above.  no UBCR0 or double buffering; status
 594  * handshaking is magic.  most device protocols don't need control-OUT.
 595  * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other
 596  * protocols do use them.
 597  */
 598 static int
 599 read_ep0_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
 600 {
 601         u8              *buf, byte;
 602         unsigned        bufferspace;
 603
 604         buf = req->req.buf + req->req.actual;
 605         bufferspace = req->req.length - req->req.actual;
 606
 607         while (UDCCS0 & UDCCS0_RNE) {
 608                 byte = (u8) UDDR0;
 609
 610                 if (unlikely (bufferspace == 0)) {
 611                         /* this happens when the driver's buffer
 612                          * is smaller than what the host sent.
 613                          * discard the extra data.
 614                          */
 615                         if (req->req.status != -EOVERFLOW)
 616                                 DMSG("%s overflow\n", ep->ep.name);
 617                         req->req.status = -EOVERFLOW;
 618                 } else {
 619                         *buf++ = byte;
 620                         req->req.actual++;
 621                         bufferspace--;
 622                 }
 623         }
 624
 625         UDCCS0 = UDCCS0_OPR | UDCCS0_IPR;
 626
 627         /* completion */
 628         if (req->req.actual >= req->req.length)
 629                 return 1;
 630
 631         /* finished that packet.  the next one may be waiting... */
 632         return 0;
 633 }
 634
 635 /*-------------------------------------------------------------------------*/
 636
 637 static int
 638 pxa2xx_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 639 {
 640         struct pxa2xx_request   *req;
 641         struct pxa2xx_ep        *ep;
 642         struct pxa2xx_udc       *dev;
 643         unsigned long           flags;
 644
 645         req = container_of(_req, struct pxa2xx_request, req);
 646         if (unlikely (!_req || !_req->complete || !_req->buf
 647                         || !list_empty(&req->queue))) {
 648                 DMSG("%s, bad params\n", __FUNCTION__);
 649                 return -EINVAL;
 650         }
 651
 652         ep = container_of(_ep, struct pxa2xx_ep, ep);
 653         if (unlikely (!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 654                 DMSG("%s, bad ep\n", __FUNCTION__);
 655                 return -EINVAL;
 656         }
 657
 658         dev = ep->dev;
 659         if (unlikely (!dev->driver
 660                         || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
 661                 DMSG("%s, bogus device state\n", __FUNCTION__);
 662                 return -ESHUTDOWN;
 663         }
 664
 665         /* iso is always one packet per request, that's the only way
 666          * we can report per-packet status.  that also helps with dma.
 667          */
 668         if (unlikely (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
 669                         && req->req.length > le16_to_cpu
 670                                                 (ep->desc->wMaxPacketSize)))
 671                 return -EMSGSIZE;
 672
 673         DBG(DBG_NOISY, "%s queue req %p, len %d buf %p\n",
 674                 _ep->name, _req, _req->length, _req->buf);
 675
 676         local_irq_save(flags);
 677
 678         _req->status = -EINPROGRESS;
 679         _req->actual = 0;
 680
 681         /* kickstart this i/o queue? */
 682         if (list_empty(&ep->queue) && !ep->stopped) {
 683                 if (ep->desc == NULL/* ep0 */) {
 684                         unsigned        length = _req->length;
 685
 686                         switch (dev->ep0state) {
 687                         case EP0_IN_DATA_PHASE:
 688                                 dev->stats.write.ops++;
 689                                 if (write_ep0_fifo(ep, req))
 690                                         req = NULL;
 691                                 break;
 692
 693                         case EP0_OUT_DATA_PHASE:
 694                                 dev->stats.read.ops++;
 695                                 /* messy ... */
 696                                 if (dev->req_config) {
 697                                         DBG(DBG_VERBOSE, "ep0 config ack%s\n",
 698                                                 dev->has_cfr ?  "" : " raced");
 699                                         if (dev->has_cfr)
 700                                                 UDCCFR = UDCCFR_AREN|UDCCFR_ACM
 701                                                         |UDCCFR_MB1;
 702                                         done(ep, req, 0);
 703                                         dev->ep0state = EP0_END_XFER;
 704                                         local_irq_restore (flags);
 705                                         return 0;
 706                                 }
 707                                 if (dev->req_pending)
 708                                         ep0start(dev, UDCCS0_IPR, "OUT");
 709                                 if (length == 0 || ((UDCCS0 & UDCCS0_RNE) != 0
 710                                                 && read_ep0_fifo(ep, req))) {
 711                                         ep0_idle(dev);
 712                                         done(ep, req, 0);
 713                                         req = NULL;
 714                                 }
 715                                 break;
 716
 717                         default:
 718                                 DMSG("ep0 i/o, odd state %d\n", dev->ep0state);
 719                                 local_irq_restore (flags);
 720                                 return -EL2HLT;
 721                         }
 722                 /* can the FIFO can satisfy the request immediately? */
 723                 } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
 724                         if ((*ep->reg_udccs & UDCCS_BI_TFS) != 0
 725                                         && write_fifo(ep, req))
 726                                 req = NULL;
 727                 } else if ((*ep->reg_udccs & UDCCS_BO_RFS) != 0
 728                                 && read_fifo(ep, req)) {
 729                         req = NULL;
 730                 }
 731
 732                 if (likely (req && ep->desc))
 733                         pio_irq_enable(ep->bEndpointAddress);
 734         }
 735
 736         /* pio or dma irq handler advances the queue. */
 737         if (likely(req != NULL))
 738                 list_add_tail(&req->queue, &ep->queue);
 739         local_irq_restore(flags);
 740
 741         return 0;
 742 }
 743
 744
 745 /*
 746  *      nuke - dequeue ALL requests
 747  */
 748 static void nuke(struct pxa2xx_ep *ep, int status)
 749 {
 750         struct pxa2xx_request *req;
 751
 752         /* called with irqs blocked */
 753         while (!list_empty(&ep->queue)) {
 754                 req = list_entry(ep->queue.next,
 755                                 struct pxa2xx_request,
 756                                 queue);
 757                 done(ep, req, status);
 758         }
 759         if (ep->desc)
 760                 pio_irq_disable (ep->bEndpointAddress);
 761 }
 762
 763
 764 /* dequeue JUST ONE request */
 765 static int pxa2xx_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 766 {
 767         struct pxa2xx_ep        *ep;
 768         struct pxa2xx_request   *req;
 769         unsigned long           flags;
 770
 771         ep = container_of(_ep, struct pxa2xx_ep, ep);
 772         if (!_ep || ep->ep.name == ep0name)
 773                 return -EINVAL;
 774
 775         local_irq_save(flags);
 776
 777         /* make sure it's actually queued on this endpoint */
 778         list_for_each_entry (req, &ep->queue, queue) {
 779                 if (&req->req == _req)
 780                         break;
 781         }
 782         if (&req->req != _req) {
 783                 local_irq_restore(flags);
 784                 return -EINVAL;
 785         }
 786
 787         done(ep, req, -ECONNRESET);
 788
 789         local_irq_restore(flags);
 790         return 0;
 791 }
 792
 793 /*-------------------------------------------------------------------------*/
 794
 795 static int pxa2xx_ep_set_halt(struct usb_ep *_ep, int value)
 796 {
 797         struct pxa2xx_ep        *ep;
 798         unsigned long           flags;
 799
 800         ep = container_of(_ep, struct pxa2xx_ep, ep);
 801         if (unlikely (!_ep
 802                         || (!ep->desc && ep->ep.name != ep0name))
 803                         || ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 804                 DMSG("%s, bad ep\n", __FUNCTION__);
 805                 return -EINVAL;
 806         }
 807         if (value == 0) {
 808                 /* this path (reset toggle+halt) is needed to implement
 809                  * SET_INTERFACE on normal hardware.  but it can't be
 810                  * done from software on the PXA UDC, and the hardware
 811                  * forgets to do it as part of SET_INTERFACE automagic.
 812                  */
 813                 DMSG("only host can clear %s halt\n", _ep->name);
 814                 return -EROFS;
 815         }
 816
 817         local_irq_save(flags);
 818
 819         if ((ep->bEndpointAddress & USB_DIR_IN) != 0
 820                         && ((*ep->reg_udccs & UDCCS_BI_TFS) == 0
 821                            || !list_empty(&ep->queue))) {
 822                 local_irq_restore(flags);
 823                 return -EAGAIN;
 824         }
 825
 826         /* FST bit is the same for control, bulk in, bulk out, interrupt in */
 827         *ep->reg_udccs = UDCCS_BI_FST|UDCCS_BI_FTF;
 828
 829         /* ep0 needs special care */
 830         if (!ep->desc) {
 831                 start_watchdog(ep->dev);
 832                 ep->dev->req_pending = 0;
 833                 ep->dev->ep0state = EP0_STALL;
 834
 835         /* and bulk/intr endpoints like dropping stalls too */
 836         } else {
 837                 unsigned i;
 838                 for (i = 0; i < 1000; i += 20) {
 839                         if (*ep->reg_udccs & UDCCS_BI_SST)
 840                                 break;
 841                         udelay(20);
 842                 }
 843         }
 844         local_irq_restore(flags);
 845
 846         DBG(DBG_VERBOSE, "%s halt\n", _ep->name);
 847         return 0;
 848 }
 849
 850 static int pxa2xx_ep_fifo_status(struct usb_ep *_ep)
 851 {
 852         struct pxa2xx_ep        *ep;
 853
 854         ep = container_of(_ep, struct pxa2xx_ep, ep);
 855         if (!_ep) {
 856                 DMSG("%s, bad ep\n", __FUNCTION__);
 857                 return -ENODEV;
 858         }
 859         /* pxa can't report unclaimed bytes from IN fifos */
 860         if ((ep->bEndpointAddress & USB_DIR_IN) != 0)
 861                 return -EOPNOTSUPP;
 862         if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN
 863                         || (*ep->reg_udccs & UDCCS_BO_RFS) == 0)
 864                 return 0;
 865         else
 866                 return (*ep->reg_ubcr & 0xfff) + 1;
 867 }
 868
 869 static void pxa2xx_ep_fifo_flush(struct usb_ep *_ep)
 870 {
 871         struct pxa2xx_ep        *ep;
 872
 873         ep = container_of(_ep, struct pxa2xx_ep, ep);
 874         if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) {
 875                 DMSG("%s, bad ep\n", __FUNCTION__);
 876                 return;
 877         }
 878
 879         /* toggle and halt bits stay unchanged */
 880
 881         /* for OUT, just read and discard the FIFO contents. */
 882         if ((ep->bEndpointAddress & USB_DIR_IN) == 0) {
 883                 while (((*ep->reg_udccs) & UDCCS_BO_RNE) != 0)
 884                         (void) *ep->reg_uddr;
 885                 return;
 886         }
 887
 888         /* most IN status is the same, but ISO can't stall */
 889         *ep->reg_udccs = UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR
 890                 | (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
 891                         ? 0 : UDCCS_BI_SST;
 892 }
 893
 894
 895 static struct usb_ep_ops pxa2xx_ep_ops = {
 896         .enable         = pxa2xx_ep_enable,
 897         .disable        = pxa2xx_ep_disable,
 898
 899         .alloc_request  = pxa2xx_ep_alloc_request,
 900         .free_request   = pxa2xx_ep_free_request,
 901
 902         .queue          = pxa2xx_ep_queue,
 903         .dequeue        = pxa2xx_ep_dequeue,
 904
 905         .set_halt       = pxa2xx_ep_set_halt,
 906         .fifo_status    = pxa2xx_ep_fifo_status,
 907         .fifo_flush     = pxa2xx_ep_fifo_flush,
 908 };
 909
 910
 911 /* ---------------------------------------------------------------------------
 912  *      device-scoped parts of the api to the usb controller hardware
 913  * ---------------------------------------------------------------------------
 914  */
 915
 916 static int pxa2xx_udc_get_frame(struct usb_gadget *_gadget)
 917 {
 918         return ((UFNRH & 0x07) << 8) | (UFNRL & 0xff);
 919 }
 920
 921 static int pxa2xx_udc_wakeup(struct usb_gadget *_gadget)
 922 {
 923         /* host may not have enabled remote wakeup */
 924         if ((UDCCS0 & UDCCS0_DRWF) == 0)
 925                 return -EHOSTUNREACH;
 926         udc_set_mask_UDCCR(UDCCR_RSM);
 927         return 0;
 928 }
 929
 930 static void stop_activity(struct pxa2xx_udc *, struct usb_gadget_driver *);
 931 static void udc_enable (struct pxa2xx_udc *);
 932 static void udc_disable(struct pxa2xx_udc *);
 933
 934 /* We disable the UDC -- and its 48 MHz clock -- whenever it's not
 935  * in active use.
 936  */
 937 static int pullup(struct pxa2xx_udc *udc, int is_active)
 938 {
 939         is_active = is_active && udc->vbus && udc->pullup;
 940         DMSG("%s\n", is_active ? "active" : "inactive");
 941         if (is_active)
 942                 udc_enable(udc);
 943         else {
 944                 if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
 945                         DMSG("disconnect %s\n", udc->driver
 946                                 ? udc->driver->driver.name
 947                                 : "(no driver)");
 948                         stop_activity(udc, udc->driver);
 949                 }
 950                 udc_disable(udc);
 951         }
 952         return 0;
 953 }
 954
 955 /* VBUS reporting logically comes from a transceiver */
 956 static int pxa2xx_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
 957 {
 958         struct pxa2xx_udc       *udc;
 959
 960         udc = container_of(_gadget, struct pxa2xx_udc, gadget);
 961         udc->vbus = is_active = (is_active != 0);
 962         DMSG("vbus %s\n", is_active ? "supplied" : "inactive");
 963         pullup(udc, is_active);
 964         return 0;
 965 }
 966
 967 /* drivers may have software control over D+ pullup */
 968 static int pxa2xx_udc_pullup(struct usb_gadget *_gadget, int is_active)
 969 {
 970         struct pxa2xx_udc       *udc;
 971
 972         udc = container_of(_gadget, struct pxa2xx_udc, gadget);
 973
 974         /* not all boards support pullup control */
 975         if (!udc->mach->gpio_pullup && !udc->mach->udc_command)
 976                 return -EOPNOTSUPP;
 977
 978         is_active = (is_active != 0);
 979         udc->pullup = is_active;
 980         pullup(udc, is_active);
 981         return 0;
 982 }
 983
 984 static const struct usb_gadget_ops pxa2xx_udc_ops = {
 985         .get_frame      = pxa2xx_udc_get_frame,
 986         .wakeup         = pxa2xx_udc_wakeup,
 987         .vbus_session   = pxa2xx_udc_vbus_session,
 988         .pullup         = pxa2xx_udc_pullup,
 989
 990         // .vbus_draw ... boards may consume current from VBUS, up to
 991         // 100-500mA based on config.  the 500uA suspend ceiling means
 992         // that exclusively vbus-powered PXA designs violate USB specs.
 993 };
 994
 995 /*-------------------------------------------------------------------------*/
 996
 997 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 998
 999 static int
1000 udc_seq_show(struct seq_file *m, void *d)
1001 {
1002         struct pxa2xx_udc       *dev = m->private;
1003         unsigned long           flags;
1004         int                     i;
1005         u32                     tmp;
1006
1007         local_irq_save(flags);
1008
1009         /* basic device status */
1010         seq_printf(m, DRIVER_DESC "\n"
1011                 "%s version: %s\nGadget driver: %s\nHost %s\n\n",
1012                 driver_name, DRIVER_VERSION SIZE_STR "(pio)",
1013                 dev->driver ? dev->driver->driver.name : "(none)",
1014                 is_vbus_present() ? "full speed" : "disconnected");
1015
1016         /* registers for device and ep0 */
1017         seq_printf(m,
1018                 "uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
1019                 UICR1, UICR0, USIR1, USIR0, UFNRH, UFNRL);
1020
1021         tmp = UDCCR;
1022         seq_printf(m,
1023                 "udccr %02X =%s%s%s%s%s%s%s%s\n", tmp,
1024                 (tmp & UDCCR_REM) ? " rem" : "",
1025                 (tmp & UDCCR_RSTIR) ? " rstir" : "",
1026                 (tmp & UDCCR_SRM) ? " srm" : "",
1027                 (tmp & UDCCR_SUSIR) ? " susir" : "",
1028                 (tmp & UDCCR_RESIR) ? " resir" : "",
1029                 (tmp & UDCCR_RSM) ? " rsm" : "",
1030                 (tmp & UDCCR_UDA) ? " uda" : "",
1031                 (tmp & UDCCR_UDE) ? " ude" : "");
1032
1033         tmp = UDCCS0;
1034         seq_printf(m,
1035                 "udccs0 %02X =%s%s%s%s%s%s%s%s\n", tmp,
1036                 (tmp & UDCCS0_SA) ? " sa" : "",
1037                 (tmp & UDCCS0_RNE) ? " rne" : "",
1038                 (tmp & UDCCS0_FST) ? " fst" : "",
1039                 (tmp & UDCCS0_SST) ? " sst" : "",
1040                 (tmp & UDCCS0_DRWF) ? " dwrf" : "",
1041                 (tmp & UDCCS0_FTF) ? " ftf" : "",
1042                 (tmp & UDCCS0_IPR) ? " ipr" : "",
1043                 (tmp & UDCCS0_OPR) ? " opr" : "");
1044
1045         if (dev->has_cfr) {
1046                 tmp = UDCCFR;
1047                 seq_printf(m,
1048                         "udccfr %02X =%s%s\n", tmp,
1049                         (tmp & UDCCFR_AREN) ? " aren" : "",
1050                         (tmp & UDCCFR_ACM) ? " acm" : "");
1051         }
1052
1053         if (!is_vbus_present() || !dev->driver)
1054                 goto done;
1055
1056         seq_printf(m, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n",
1057                 dev->stats.write.bytes, dev->stats.write.ops,
1058                 dev->stats.read.bytes, dev->stats.read.ops,
1059                 dev->stats.irqs);
1060
1061         /* dump endpoint queues */
1062         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1063                 struct pxa2xx_ep        *ep = &dev->ep [i];
1064                 struct pxa2xx_request   *req;
1065
1066                 if (i != 0) {
1067                         const struct usb_endpoint_descriptor    *desc;
1068
1069                         desc = ep->desc;
1070                         if (!desc)
1071                                 continue;
1072                         tmp = *dev->ep [i].reg_udccs;
1073                         seq_printf(m,
1074                                 "%s max %d %s udccs %02x irqs %lu\n",
1075                                 ep->ep.name, le16_to_cpu(desc->wMaxPacketSize),
1076                                 "pio", tmp, ep->pio_irqs);
1077                         /* TODO translate all five groups of udccs bits! */
1078
1079                 } else /* ep0 should only have one transfer queued */
1080                         seq_printf(m, "ep0 max 16 pio irqs %lu\n",
1081                                 ep->pio_irqs);
1082
1083                 if (list_empty(&ep->queue)) {
1084                         seq_printf(m, "\t(nothing queued)\n");
1085                         continue;
1086                 }
1087                 list_for_each_entry(req, &ep->queue, queue) {
1088                         seq_printf(m,
1089                                         "\treq %p len %d/%d buf %p\n",
1090                                         &req->req, req->req.actual,
1091                                         req->req.length, req->req.buf);
1092                 }
1093         }
1094
1095 done:
1096         local_irq_restore(flags);
1097         return 0;
1098 }
1099
1100 static int
1101 udc_debugfs_open(struct inode *inode, struct file *file)
1102 {
1103         return single_open(file, udc_seq_show, inode->i_private);
1104 }
1105
1106 static const struct file_operations debug_fops = {
1107         .open           = udc_debugfs_open,
1108         .read           = seq_read,
1109         .llseek         = seq_lseek,
1110         .release        = single_release,
1111         .owner          = THIS_MODULE,
1112 };
1113
1114 #define create_debug_files(dev) \
1115         do { \
1116                 dev->debugfs_udc = debugfs_create_file(dev->gadget.name, \
1117                         S_IRUGO, NULL, dev, &debug_fops); \
1118         } while (0)
1119 #define remove_debug_files(dev) \
1120         do { \
1121                 if (dev->debugfs_udc) \
1122                         debugfs_remove(dev->debugfs_udc); \
1123         } while (0)
1124
1125 #else   /* !CONFIG_USB_GADGET_DEBUG_FILES */
1126
1127 #define create_debug_files(dev) do {} while (0)
1128 #define remove_debug_files(dev) do {} while (0)
1129
1130 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1131
1132 /*-------------------------------------------------------------------------*/
1133
1134 /*
1135  *      udc_disable - disable USB device controller
1136  */
1137 static void udc_disable(struct pxa2xx_udc *dev)
1138 {
1139         /* block all irqs */
1140         udc_set_mask_UDCCR(UDCCR_SRM|UDCCR_REM);
1141         UICR0 = UICR1 = 0xff;
1142         UFNRH = UFNRH_SIM;
1143
1144         /* if hardware supports it, disconnect from usb */
1145         pullup_off();
1146
1147         udc_clear_mask_UDCCR(UDCCR_UDE);
1148
1149 #ifdef  CONFIG_ARCH_PXA
1150         /* Disable clock for USB device */
1151         clk_disable(dev->clk);
1152 #endif
1153
1154         ep0_idle (dev);
1155         dev->gadget.speed = USB_SPEED_UNKNOWN;
1156 }
1157
1158
1159 /*
1160  *      udc_reinit - initialize software state
1161  */
1162 static void udc_reinit(struct pxa2xx_udc *dev)
1163 {
1164         u32     i;
1165
1166         /* device/ep0 records init */
1167         INIT_LIST_HEAD (&dev->gadget.ep_list);
1168         INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1169         dev->ep0state = EP0_IDLE;
1170
1171         /* basic endpoint records init */
1172         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1173                 struct pxa2xx_ep *ep = &dev->ep[i];
1174
1175                 if (i != 0)
1176                         list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1177
1178                 ep->desc = NULL;
1179                 ep->stopped = 0;
1180                 INIT_LIST_HEAD (&ep->queue);
1181                 ep->pio_irqs = 0;
1182         }
1183
1184         /* the rest was statically initialized, and is read-only */
1185 }
1186
1187 /* until it's enabled, this UDC should be completely invisible
1188  * to any USB host.
1189  */
1190 static void udc_enable (struct pxa2xx_udc *dev)
1191 {
1192         udc_clear_mask_UDCCR(UDCCR_UDE);
1193
1194 #ifdef  CONFIG_ARCH_PXA
1195         /* Enable clock for USB device */
1196         clk_enable(dev->clk);
1197 #endif
1198
1199         /* try to clear these bits before we enable the udc */
1200         udc_ack_int_UDCCR(UDCCR_SUSIR|/*UDCCR_RSTIR|*/UDCCR_RESIR);
1201
1202         ep0_idle(dev);
1203         dev->gadget.speed = USB_SPEED_UNKNOWN;
1204         dev->stats.irqs = 0;
1205
1206         /*
1207          * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual:
1208          * - enable UDC
1209          * - if RESET is already in progress, ack interrupt
1210          * - unmask reset interrupt
1211          */
1212         udc_set_mask_UDCCR(UDCCR_UDE);
1213         if (!(UDCCR & UDCCR_UDA))
1214                 udc_ack_int_UDCCR(UDCCR_RSTIR);
1215
1216         if (dev->has_cfr /* UDC_RES2 is defined */) {
1217                 /* pxa255 (a0+) can avoid a set_config race that could
1218                  * prevent gadget drivers from configuring correctly
1219                  */
1220                 UDCCFR = UDCCFR_ACM | UDCCFR_MB1;
1221         } else {
1222                 /* "USB test mode" for pxa250 errata 40-42 (stepping a0, a1)
1223                  * which could result in missing packets and interrupts.
1224                  * supposedly one bit per endpoint, controlling whether it
1225                  * double buffers or not; ACM/AREN bits fit into the holes.
1226                  * zero bits (like USIR0_IRx) disable double buffering.
1227                  */
1228                 UDC_RES1 = 0x00;
1229                 UDC_RES2 = 0x00;
1230         }
1231
1232         /* enable suspend/resume and reset irqs */
1233         udc_clear_mask_UDCCR(UDCCR_SRM | UDCCR_REM);
1234
1235         /* enable ep0 irqs */
1236         UICR0 &= ~UICR0_IM0;
1237
1238         /* if hardware supports it, pullup D+ and wait for reset */
1239         pullup_on();
1240 }
1241
1242
1243 /* when a driver is successfully registered, it will receive
1244  * control requests including set_configuration(), which enables
1245  * non-control requests.  then usb traffic follows until a
1246  * disconnect is reported.  then a host may connect again, or
1247  * the driver might get unbound.
1248  */
1249 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1250 {
1251         struct pxa2xx_udc       *dev = the_controller;
1252         int                     retval;
1253
1254         if (!driver
1255                         || driver->speed < USB_SPEED_FULL
1256                         || !driver->bind
1257                         || !driver->disconnect
1258                         || !driver->setup)
1259                 return -EINVAL;
1260         if (!dev)
1261                 return -ENODEV;
1262         if (dev->driver)
1263                 return -EBUSY;
1264
1265         /* first hook up the driver ... */
1266         dev->driver = driver;
1267         dev->gadget.dev.driver = &driver->driver;
1268         dev->pullup = 1;
1269
1270         retval = device_add (&dev->gadget.dev);
1271         if (retval) {
1272 fail:
1273                 dev->driver = NULL;
1274                 dev->gadget.dev.driver = NULL;
1275                 return retval;
1276         }
1277         retval = driver->bind(&dev->gadget);
1278         if (retval) {
1279                 DMSG("bind to driver %s --> error %d\n",
1280                                 driver->driver.name, retval);
1281                 device_del (&dev->gadget.dev);
1282                 goto fail;
1283         }
1284
1285         /* ... then enable host detection and ep0; and we're ready
1286          * for set_configuration as well as eventual disconnect.
1287          */
1288         DMSG("registered gadget driver '%s'\n", driver->driver.name);
1289         pullup(dev, 1);
1290         dump_state(dev);
1291         return 0;
1292 }
1293 EXPORT_SYMBOL(usb_gadget_register_driver);
1294
1295 static void
1296 stop_activity(struct pxa2xx_udc *dev, struct usb_gadget_driver *driver)
1297 {
1298         int i;
1299
1300         /* don't disconnect drivers more than once */
1301         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1302                 driver = NULL;
1303         dev->gadget.speed = USB_SPEED_UNKNOWN;
1304
1305         /* prevent new request submissions, kill any outstanding requests  */
1306         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1307                 struct pxa2xx_ep *ep = &dev->ep[i];
1308
1309                 ep->stopped = 1;
1310                 nuke(ep, -ESHUTDOWN);
1311         }
1312         del_timer_sync(&dev->timer);
1313
1314         /* report disconnect; the driver is already quiesced */
1315         if (driver)
1316                 driver->disconnect(&dev->gadget);
1317
1318         /* re-init driver-visible data structures */
1319         udc_reinit(dev);
1320 }
1321
1322 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1323 {
1324         struct pxa2xx_udc       *dev = the_controller;
1325
1326         if (!dev)
1327                 return -ENODEV;
1328         if (!driver || driver != dev->driver || !driver->unbind)
1329                 return -EINVAL;
1330
1331         local_irq_disable();
1332         pullup(dev, 0);
1333         stop_activity(dev, driver);
1334         local_irq_enable();
1335
1336         driver->unbind(&dev->gadget);
1337         dev->gadget.dev.driver = NULL;
1338         dev->driver = NULL;
1339
1340         device_del (&dev->gadget.dev);
1341
1342         DMSG("unregistered gadget driver '%s'\n", driver->driver.name);
1343         dump_state(dev);
1344         return 0;
1345 }
1346 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1347
1348
1349 /*-------------------------------------------------------------------------*/
1350
1351 #ifdef CONFIG_ARCH_LUBBOCK
1352
1353 /* Lubbock has separate connect and disconnect irqs.  More typical designs
1354  * use one GPIO as the VBUS IRQ, and another to control the D+ pullup.
1355  */
1356
1357 static irqreturn_t
1358 lubbock_vbus_irq(int irq, void *_dev)
1359 {
1360         struct pxa2xx_udc       *dev = _dev;
1361         int                     vbus;
1362
1363         dev->stats.irqs++;
1364         switch (irq) {
1365         case LUBBOCK_USB_IRQ:
1366                 vbus = 1;
1367                 disable_irq(LUBBOCK_USB_IRQ);
1368                 enable_irq(LUBBOCK_USB_DISC_IRQ);
1369                 break;
1370         case LUBBOCK_USB_DISC_IRQ:
1371                 vbus = 0;
1372                 disable_irq(LUBBOCK_USB_DISC_IRQ);
1373                 enable_irq(LUBBOCK_USB_IRQ);
1374                 break;
1375         default:
1376                 return IRQ_NONE;
1377         }
1378
1379         pxa2xx_udc_vbus_session(&dev->gadget, vbus);
1380         return IRQ_HANDLED;
1381 }
1382
1383 #endif
1384
1385 static irqreturn_t udc_vbus_irq(int irq, void *_dev)
1386 {
1387         struct pxa2xx_udc       *dev = _dev;
1388         int                     vbus = gpio_get_value(dev->mach->gpio_vbus);
1389
1390         if (dev->mach->gpio_vbus_inverted)
1391                 vbus = !vbus;
1392
1393         pxa2xx_udc_vbus_session(&dev->gadget, vbus);
1394         return IRQ_HANDLED;
1395 }
1396
1397
1398 /*-------------------------------------------------------------------------*/
1399
1400 static inline void clear_ep_state (struct pxa2xx_udc *dev)
1401 {
1402         unsigned i;
1403
1404         /* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint
1405          * fifos, and pending transactions mustn't be continued in any case.
1406          */
1407         for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++)
1408                 nuke(&dev->ep[i], -ECONNABORTED);
1409 }
1410
1411 static void udc_watchdog(unsigned long _dev)
1412 {
1413         struct pxa2xx_udc       *dev = (void *)_dev;
1414
1415         local_irq_disable();
1416         if (dev->ep0state == EP0_STALL
1417                         && (UDCCS0 & UDCCS0_FST) == 0
1418                         && (UDCCS0 & UDCCS0_SST) == 0) {
1419                 UDCCS0 = UDCCS0_FST|UDCCS0_FTF;
1420                 DBG(DBG_VERBOSE, "ep0 re-stall\n");
1421                 start_watchdog(dev);
1422         }
1423         local_irq_enable();
1424 }
1425
1426 static void handle_ep0 (struct pxa2xx_udc *dev)
1427 {
1428         u32                     udccs0 = UDCCS0;
1429         struct pxa2xx_ep        *ep = &dev->ep [0];
1430         struct pxa2xx_request   *req;
1431         union {
1432                 struct usb_ctrlrequest  r;
1433                 u8                      raw [8];
1434                 u32                     word [2];
1435         } u;
1436
1437         if (list_empty(&ep->queue))
1438                 req = NULL;
1439         else
1440                 req = list_entry(ep->queue.next, struct pxa2xx_request, queue);
1441
1442         /* clear stall status */
1443         if (udccs0 & UDCCS0_SST) {
1444                 nuke(ep, -EPIPE);
1445                 UDCCS0 = UDCCS0_SST;
1446                 del_timer(&dev->timer);
1447                 ep0_idle(dev);
1448         }
1449
1450         /* previous request unfinished?  non-error iff back-to-back ... */
1451         if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) {
1452                 nuke(ep, 0);
1453                 del_timer(&dev->timer);
1454                 ep0_idle(dev);
1455         }
1456
1457         switch (dev->ep0state) {
1458         case EP0_IDLE:
1459                 /* late-breaking status? */
1460                 udccs0 = UDCCS0;
1461
1462                 /* start control request? */
1463                 if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))
1464                                 == (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) {
1465                         int i;
1466
1467                         nuke (ep, -EPROTO);
1468
1469                         /* read SETUP packet */
1470                         for (i = 0; i < 8; i++) {
1471                                 if (unlikely(!(UDCCS0 & UDCCS0_RNE))) {
1472 bad_setup:
1473                                         DMSG("SETUP %d!\n", i);
1474                                         goto stall;
1475                                 }
1476                                 u.raw [i] = (u8) UDDR0;
1477                         }
1478                         if (unlikely((UDCCS0 & UDCCS0_RNE) != 0))
1479                                 goto bad_setup;
1480
1481 got_setup:
1482                         DBG(DBG_VERBOSE, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1483                                 u.r.bRequestType, u.r.bRequest,
1484                                 le16_to_cpu(u.r.wValue),
1485                                 le16_to_cpu(u.r.wIndex),
1486                                 le16_to_cpu(u.r.wLength));
1487
1488                         /* cope with automagic for some standard requests. */
1489                         dev->req_std = (u.r.bRequestType & USB_TYPE_MASK)
1490                                                 == USB_TYPE_STANDARD;
1491                         dev->req_config = 0;
1492                         dev->req_pending = 1;
1493                         switch (u.r.bRequest) {
1494                         /* hardware restricts gadget drivers here! */
1495                         case USB_REQ_SET_CONFIGURATION:
1496                                 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1497                                         /* reflect hardware's automagic
1498                                          * up to the gadget driver.
1499                                          */
1500 config_change:
1501                                         dev->req_config = 1;
1502                                         clear_ep_state(dev);
1503                                         /* if !has_cfr, there's no synch
1504                                          * else use AREN (later) not SA|OPR
1505                                          * USIR0_IR0 acts edge sensitive
1506                                          */
1507                                 }
1508                                 break;
1509                         /* ... and here, even more ... */
1510                         case USB_REQ_SET_INTERFACE:
1511                                 if (u.r.bRequestType == USB_RECIP_INTERFACE) {
1512                                         /* udc hardware is broken by design:
1513                                          *  - altsetting may only be zero;
1514                                          *  - hw resets all interfaces' eps;
1515                                          *  - ep reset doesn't include halt(?).
1516                                          */
1517                                         DMSG("broken set_interface (%d/%d)\n",
1518                                                 le16_to_cpu(u.r.wIndex),
1519                                                 le16_to_cpu(u.r.wValue));
1520                                         goto config_change;
1521                                 }
1522                                 break;
1523                         /* hardware was supposed to hide this */
1524                         case USB_REQ_SET_ADDRESS:
1525                                 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1526                                         ep0start(dev, 0, "address");
1527                                         return;
1528                                 }
1529                                 break;
1530                         }
1531
1532                         if (u.r.bRequestType & USB_DIR_IN)
1533                                 dev->ep0state = EP0_IN_DATA_PHASE;
1534                         else
1535                                 dev->ep0state = EP0_OUT_DATA_PHASE;
1536
1537                         i = dev->driver->setup(&dev->gadget, &u.r);
1538                         if (i < 0) {
1539                                 /* hardware automagic preventing STALL... */
1540                                 if (dev->req_config) {
1541                                         /* hardware sometimes neglects to tell
1542                                          * tell us about config change events,
1543                                          * so later ones may fail...
1544                                          */
1545                                         WARN("config change %02x fail %d?\n",
1546                                                 u.r.bRequest, i);
1547                                         return;
1548                                         /* TODO experiment:  if has_cfr,
1549                                          * hardware didn't ACK; maybe we
1550                                          * could actually STALL!
1551                                          */
1552                                 }
1553                                 DBG(DBG_VERBOSE, "protocol STALL, "
1554                                         "%02x err %d\n", UDCCS0, i);
1555 stall:
1556                                 /* the watchdog timer helps deal with cases
1557                                  * where udc seems to clear FST wrongly, and
1558                                  * then NAKs instead of STALLing.
1559                                  */
1560                                 ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall");
1561                                 start_watchdog(dev);
1562                                 dev->ep0state = EP0_STALL;
1563
1564                         /* deferred i/o == no response yet */
1565                         } else if (dev->req_pending) {
1566                                 if (likely(dev->ep0state == EP0_IN_DATA_PHASE
1567                                                 || dev->req_std || u.r.wLength))
1568                                         ep0start(dev, 0, "defer");
1569                                 else
1570                                         ep0start(dev, UDCCS0_IPR, "defer/IPR");
1571                         }
1572
1573                         /* expect at least one data or status stage irq */
1574                         return;
1575
1576                 } else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA))
1577                                 == (UDCCS0_OPR|UDCCS0_SA))) {
1578                         unsigned i;
1579
1580                         /* pxa210/250 erratum 131 for B0/B1 says RNE lies.
1581                          * still observed on a pxa255 a0.
1582                          */
1583                         DBG(DBG_VERBOSE, "e131\n");
1584                         nuke(ep, -EPROTO);
1585
1586                         /* read SETUP data, but don't trust it too much */
1587                         for (i = 0; i < 8; i++)
1588                                 u.raw [i] = (u8) UDDR0;
1589                         if ((u.r.bRequestType & USB_RECIP_MASK)
1590                                         > USB_RECIP_OTHER)
1591                                 goto stall;
1592                         if (u.word [0] == 0 && u.word [1] == 0)
1593                                 goto stall;
1594                         goto got_setup;
1595                 } else {
1596                         /* some random early IRQ:
1597                          * - we acked FST
1598                          * - IPR cleared
1599                          * - OPR got set, without SA (likely status stage)
1600                          */
1601                         UDCCS0 = udccs0 & (UDCCS0_SA|UDCCS0_OPR);
1602                 }
1603                 break;
1604         case EP0_IN_DATA_PHASE:                 /* GET_DESCRIPTOR etc */
1605                 if (udccs0 & UDCCS0_OPR) {
1606                         UDCCS0 = UDCCS0_OPR|UDCCS0_FTF;
1607                         DBG(DBG_VERBOSE, "ep0in premature status\n");
1608                         if (req)
1609                                 done(ep, req, 0);
1610                         ep0_idle(dev);
1611                 } else /* irq was IPR clearing */ {
1612                         if (req) {
1613                                 /* this IN packet might finish the request */
1614                                 (void) write_ep0_fifo(ep, req);
1615                         } /* else IN token before response was written */
1616                 }
1617                 break;
1618         case EP0_OUT_DATA_PHASE:                /* SET_DESCRIPTOR etc */
1619                 if (udccs0 & UDCCS0_OPR) {
1620                         if (req) {
1621                                 /* this OUT packet might finish the request */
1622                                 if (read_ep0_fifo(ep, req))
1623                                         done(ep, req, 0);
1624                                 /* else more OUT packets expected */
1625                         } /* else OUT token before read was issued */
1626                 } else /* irq was IPR clearing */ {
1627                         DBG(DBG_VERBOSE, "ep0out premature status\n");
1628                         if (req)
1629                                 done(ep, req, 0);
1630                         ep0_idle(dev);
1631                 }
1632                 break;
1633         case EP0_END_XFER:
1634                 if (req)
1635                         done(ep, req, 0);
1636                 /* ack control-IN status (maybe in-zlp was skipped)
1637                  * also appears after some config change events.
1638                  */
1639                 if (udccs0 & UDCCS0_OPR)
1640                         UDCCS0 = UDCCS0_OPR;
1641                 ep0_idle(dev);
1642                 break;
1643         case EP0_STALL:
1644                 UDCCS0 = UDCCS0_FST;
1645                 break;
1646         }
1647         USIR0 = USIR0_IR0;
1648 }
1649
1650 static void handle_ep(struct pxa2xx_ep *ep)
1651 {
1652         struct pxa2xx_request   *req;
1653         int                     is_in = ep->bEndpointAddress & USB_DIR_IN;
1654         int                     completed;
1655         u32                     udccs, tmp;
1656
1657         do {
1658                 completed = 0;
1659                 if (likely (!list_empty(&ep->queue)))
1660                         req = list_entry(ep->queue.next,
1661                                         struct pxa2xx_request, queue);
1662                 else
1663                         req = NULL;
1664
1665                 // TODO check FST handling
1666
1667                 udccs = *ep->reg_udccs;
1668                 if (unlikely(is_in)) {  /* irq from TPC, SST, or (ISO) TUR */
1669                         tmp = UDCCS_BI_TUR;
1670                         if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1671                                 tmp |= UDCCS_BI_SST;
1672                         tmp &= udccs;
1673                         if (likely (tmp))
1674                                 *ep->reg_udccs = tmp;
1675                         if (req && likely ((udccs & UDCCS_BI_TFS) != 0))
1676                                 completed = write_fifo(ep, req);
1677
1678                 } else {        /* irq from RPC (or for ISO, ROF) */
1679                         if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1680                                 tmp = UDCCS_BO_SST | UDCCS_BO_DME;
1681                         else
1682                                 tmp = UDCCS_IO_ROF | UDCCS_IO_DME;
1683                         tmp &= udccs;
1684                         if (likely(tmp))
1685                                 *ep->reg_udccs = tmp;
1686
1687                         /* fifos can hold packets, ready for reading... */
1688                         if (likely(req)) {
1689                                 completed = read_fifo(ep, req);
1690                         } else
1691                                 pio_irq_disable (ep->bEndpointAddress);
1692                 }
1693                 ep->pio_irqs++;
1694         } while (completed);
1695 }
1696
1697 /*
1698  *      pxa2xx_udc_irq - interrupt handler
1699  *
1700  * avoid delays in ep0 processing. the control handshaking isn't always
1701  * under software control (pxa250c0 and the pxa255 are better), and delays
1702  * could cause usb protocol errors.
1703  */
1704 static irqreturn_t
1705 pxa2xx_udc_irq(int irq, void *_dev)
1706 {
1707         struct pxa2xx_udc       *dev = _dev;
1708         int                     handled;
1709
1710         dev->stats.irqs++;
1711         do {
1712                 u32             udccr = UDCCR;
1713
1714                 handled = 0;
1715
1716                 /* SUSpend Interrupt Request */
1717                 if (unlikely(udccr & UDCCR_SUSIR)) {
1718                         udc_ack_int_UDCCR(UDCCR_SUSIR);
1719                         handled = 1;
1720                         DBG(DBG_VERBOSE, "USB suspend%s\n", is_vbus_present()
1721                                 ? "" : "+disconnect");
1722
1723                         if (!is_vbus_present())
1724                                 stop_activity(dev, dev->driver);
1725                         else if (dev->gadget.speed != USB_SPEED_UNKNOWN
1726                                         && dev->driver
1727                                         && dev->driver->suspend)
1728                                 dev->driver->suspend(&dev->gadget);
1729                         ep0_idle (dev);
1730                 }
1731
1732                 /* RESume Interrupt Request */
1733                 if (unlikely(udccr & UDCCR_RESIR)) {
1734                         udc_ack_int_UDCCR(UDCCR_RESIR);
1735                         handled = 1;
1736                         DBG(DBG_VERBOSE, "USB resume\n");
1737
1738                         if (dev->gadget.speed != USB_SPEED_UNKNOWN
1739                                         && dev->driver
1740                                         && dev->driver->resume
1741                                         && is_vbus_present())
1742                                 dev->driver->resume(&dev->gadget);
1743                 }
1744
1745                 /* ReSeT Interrupt Request - USB reset */
1746                 if (unlikely(udccr & UDCCR_RSTIR)) {
1747                         udc_ack_int_UDCCR(UDCCR_RSTIR);
1748                         handled = 1;
1749
1750                         if ((UDCCR & UDCCR_UDA) == 0) {
1751                                 DBG(DBG_VERBOSE, "USB reset start\n");
1752
1753                                 /* reset driver and endpoints,
1754                                  * in case that's not yet done
1755                                  */
1756                                 stop_activity (dev, dev->driver);
1757
1758                         } else {
1759                                 DBG(DBG_VERBOSE, "USB reset end\n");
1760                                 dev->gadget.speed = USB_SPEED_FULL;
1761                                 memset(&dev->stats, 0, sizeof dev->stats);
1762                                 /* driver and endpoints are still reset */
1763                         }
1764
1765                 } else {
1766                         u32     usir0 = USIR0 & ~UICR0;
1767                         u32     usir1 = USIR1 & ~UICR1;
1768                         int     i;
1769
1770                         if (unlikely (!usir0 && !usir1))
1771                                 continue;
1772
1773                         DBG(DBG_VERY_NOISY, "irq %02x.%02x\n", usir1, usir0);
1774
1775                         /* control traffic */
1776                         if (usir0 & USIR0_IR0) {
1777                                 dev->ep[0].pio_irqs++;
1778                                 handle_ep0(dev);
1779                                 handled = 1;
1780                         }
1781
1782                         /* endpoint data transfers */
1783                         for (i = 0; i < 8; i++) {
1784                                 u32     tmp = 1 << i;
1785
1786                                 if (i && (usir0 & tmp)) {
1787                                         handle_ep(&dev->ep[i]);
1788                                         USIR0 |= tmp;
1789                                         handled = 1;
1790                                 }
1791                                 if (usir1 & tmp) {
1792                                         handle_ep(&dev->ep[i+8]);
1793                                         USIR1 |= tmp;
1794                                         handled = 1;
1795                                 }
1796                         }
1797                 }
1798
1799                 /* we could also ask for 1 msec SOF (SIR) interrupts */
1800
1801         } while (handled);
1802         return IRQ_HANDLED;
1803 }
1804
1805 /*-------------------------------------------------------------------------*/
1806
1807 static void nop_release (struct device *dev)
1808 {
1809         DMSG("%s %s\n", __FUNCTION__, dev->bus_id);
1810 }
1811
1812 /* this uses load-time allocation and initialization (instead of
1813  * doing it at run-time) to save code, eliminate fault paths, and
1814  * be more obviously correct.
1815  */
1816 static struct pxa2xx_udc memory = {
1817         .gadget = {
1818                 .ops            = &pxa2xx_udc_ops,
1819                 .ep0            = &memory.ep[0].ep,
1820                 .name           = driver_name,
1821                 .dev = {
1822                         .bus_id         = "gadget",
1823                         .release        = nop_release,
1824                 },
1825         },
1826
1827         /* control endpoint */
1828         .ep[0] = {
1829                 .ep = {
1830                         .name           = ep0name,
1831                         .ops            = &pxa2xx_ep_ops,
1832                         .maxpacket      = EP0_FIFO_SIZE,
1833                 },
1834                 .dev            = &memory,
1835                 .reg_udccs      = &UDCCS0,
1836                 .reg_uddr       = &UDDR0,
1837         },
1838
1839         /* first group of endpoints */
1840         .ep[1] = {
1841                 .ep = {
1842                         .name           = "ep1in-bulk",
1843                         .ops            = &pxa2xx_ep_ops,
1844                         .maxpacket      = BULK_FIFO_SIZE,
1845                 },
1846                 .dev            = &memory,
1847                 .fifo_size      = BULK_FIFO_SIZE,
1848                 .bEndpointAddress = USB_DIR_IN | 1,
1849                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1850                 .reg_udccs      = &UDCCS1,
1851                 .reg_uddr       = &UDDR1,
1852         },
1853         .ep[2] = {
1854                 .ep = {
1855                         .name           = "ep2out-bulk",
1856                         .ops            = &pxa2xx_ep_ops,
1857                         .maxpacket      = BULK_FIFO_SIZE,
1858                 },
1859                 .dev            = &memory,
1860                 .fifo_size      = BULK_FIFO_SIZE,
1861                 .bEndpointAddress = 2,
1862                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1863                 .reg_udccs      = &UDCCS2,
1864                 .reg_ubcr       = &UBCR2,
1865                 .reg_uddr       = &UDDR2,
1866         },
1867 #ifndef CONFIG_USB_PXA2XX_SMALL
1868         .ep[3] = {
1869                 .ep = {
1870                         .name           = "ep3in-iso",
1871                         .ops            = &pxa2xx_ep_ops,
1872                         .maxpacket      = ISO_FIFO_SIZE,
1873                 },
1874                 .dev            = &memory,
1875                 .fifo_size      = ISO_FIFO_SIZE,
1876                 .bEndpointAddress = USB_DIR_IN | 3,
1877                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1878                 .reg_udccs      = &UDCCS3,
1879                 .reg_uddr       = &UDDR3,
1880         },
1881         .ep[4] = {
1882                 .ep = {
1883                         .name           = "ep4out-iso",
1884                         .ops            = &pxa2xx_ep_ops,
1885                         .maxpacket      = ISO_FIFO_SIZE,
1886                 },
1887                 .dev            = &memory,
1888                 .fifo_size      = ISO_FIFO_SIZE,
1889                 .bEndpointAddress = 4,
1890                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1891                 .reg_udccs      = &UDCCS4,
1892                 .reg_ubcr       = &UBCR4,
1893                 .reg_uddr       = &UDDR4,
1894         },
1895         .ep[5] = {
1896                 .ep = {
1897                         .name           = "ep5in-int",
1898                         .ops            = &pxa2xx_ep_ops,
1899                         .maxpacket      = INT_FIFO_SIZE,
1900                 },
1901                 .dev            = &memory,
1902                 .fifo_size      = INT_FIFO_SIZE,
1903                 .bEndpointAddress = USB_DIR_IN | 5,
1904                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
1905                 .reg_udccs      = &UDCCS5,
1906                 .reg_uddr       = &UDDR5,
1907         },
1908
1909         /* second group of endpoints */
1910         .ep[6] = {
1911                 .ep = {
1912                         .name           = "ep6in-bulk",
1913                         .ops            = &pxa2xx_ep_ops,
1914                         .maxpacket      = BULK_FIFO_SIZE,
1915                 },
1916                 .dev            = &memory,
1917                 .fifo_size      = BULK_FIFO_SIZE,
1918                 .bEndpointAddress = USB_DIR_IN | 6,
1919                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1920                 .reg_udccs      = &UDCCS6,
1921                 .reg_uddr       = &UDDR6,
1922         },
1923         .ep[7] = {
1924                 .ep = {
1925                         .name           = "ep7out-bulk",
1926                         .ops            = &pxa2xx_ep_ops,
1927                         .maxpacket      = BULK_FIFO_SIZE,
1928                 },
1929                 .dev            = &memory,
1930                 .fifo_size      = BULK_FIFO_SIZE,
1931                 .bEndpointAddress = 7,
1932                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1933                 .reg_udccs      = &UDCCS7,
1934                 .reg_ubcr       = &UBCR7,
1935                 .reg_uddr       = &UDDR7,
1936         },
1937         .ep[8] = {
1938                 .ep = {
1939                         .name           = "ep8in-iso",
1940                         .ops            = &pxa2xx_ep_ops,
1941                         .maxpacket      = ISO_FIFO_SIZE,
1942                 },
1943                 .dev            = &memory,
1944                 .fifo_size      = ISO_FIFO_SIZE,
1945                 .bEndpointAddress = USB_DIR_IN | 8,
1946                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1947                 .reg_udccs      = &UDCCS8,
1948                 .reg_uddr       = &UDDR8,
1949         },
1950         .ep[9] = {
1951                 .ep = {
1952                         .name           = "ep9out-iso",
1953                         .ops            = &pxa2xx_ep_ops,
1954                         .maxpacket      = ISO_FIFO_SIZE,
1955                 },
1956                 .dev            = &memory,
1957                 .fifo_size      = ISO_FIFO_SIZE,
1958                 .bEndpointAddress = 9,
1959                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1960                 .reg_udccs      = &UDCCS9,
1961                 .reg_ubcr       = &UBCR9,
1962                 .reg_uddr       = &UDDR9,
1963         },
1964         .ep[10] = {
1965                 .ep = {
1966                         .name           = "ep10in-int",
1967                         .ops            = &pxa2xx_ep_ops,
1968                         .maxpacket      = INT_FIFO_SIZE,
1969                 },
1970                 .dev            = &memory,
1971                 .fifo_size      = INT_FIFO_SIZE,
1972                 .bEndpointAddress = USB_DIR_IN | 10,
1973                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
1974                 .reg_udccs      = &UDCCS10,
1975                 .reg_uddr       = &UDDR10,
1976         },
1977
1978         /* third group of endpoints */
1979         .ep[11] = {
1980                 .ep = {
1981                         .name           = "ep11in-bulk",
1982                         .ops            = &pxa2xx_ep_ops,
1983                         .maxpacket      = BULK_FIFO_SIZE,
1984                 },
1985                 .dev            = &memory,
1986                 .fifo_size      = BULK_FIFO_SIZE,
1987                 .bEndpointAddress = USB_DIR_IN | 11,
1988                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1989                 .reg_udccs      = &UDCCS11,
1990                 .reg_uddr       = &UDDR11,
1991         },
1992         .ep[12] = {
1993                 .ep = {
1994                         .name           = "ep12out-bulk",
1995                         .ops            = &pxa2xx_ep_ops,
1996                         .maxpacket      = BULK_FIFO_SIZE,
1997                 },
1998                 .dev            = &memory,
1999                 .fifo_size      = BULK_FIFO_SIZE,
2000                 .bEndpointAddress = 12,
2001                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2002                 .reg_udccs      = &UDCCS12,
2003                 .reg_ubcr       = &UBCR12,
2004                 .reg_uddr       = &UDDR12,
2005         },
2006         .ep[13] = {
2007                 .ep = {
2008                         .name           = "ep13in-iso",
2009                         .ops            = &pxa2xx_ep_ops,
2010                         .maxpacket      = ISO_FIFO_SIZE,
2011                 },
2012                 .dev            = &memory,
2013                 .fifo_size      = ISO_FIFO_SIZE,
2014                 .bEndpointAddress = USB_DIR_IN | 13,
2015                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2016                 .reg_udccs      = &UDCCS13,
2017                 .reg_uddr       = &UDDR13,
2018         },
2019         .ep[14] = {
2020                 .ep = {
2021                         .name           = "ep14out-iso",
2022                         .ops            = &pxa2xx_ep_ops,
2023                         .maxpacket      = ISO_FIFO_SIZE,
2024                 },
2025                 .dev            = &memory,
2026                 .fifo_size      = ISO_FIFO_SIZE,
2027                 .bEndpointAddress = 14,
2028                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2029                 .reg_udccs      = &UDCCS14,
2030                 .reg_ubcr       = &UBCR14,
2031                 .reg_uddr       = &UDDR14,
2032         },
2033         .ep[15] = {
2034                 .ep = {
2035                         .name           = "ep15in-int",
2036                         .ops            = &pxa2xx_ep_ops,
2037                         .maxpacket      = INT_FIFO_SIZE,
2038                 },
2039                 .dev            = &memory,
2040                 .fifo_size      = INT_FIFO_SIZE,
2041                 .bEndpointAddress = USB_DIR_IN | 15,
2042                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
2043                 .reg_udccs      = &UDCCS15,
2044                 .reg_uddr       = &UDDR15,
2045         },
2046 #endif /* !CONFIG_USB_PXA2XX_SMALL */
2047 };
2048
2049 #define CP15R0_VENDOR_MASK      0xffffe000
2050
2051 #if     defined(CONFIG_ARCH_PXA)
2052 #define CP15R0_XSCALE_VALUE     0x69052000      /* intel/arm/xscale */
2053
2054 #elif   defined(CONFIG_ARCH_IXP4XX)
2055 #define CP15R0_XSCALE_VALUE     0x69054000      /* intel/arm/ixp4xx */
2056
2057 #endif
2058
2059 #define CP15R0_PROD_MASK        0x000003f0
2060 #define PXA25x                  0x00000100      /* and PXA26x */
2061 #define PXA210                  0x00000120
2062
2063 #define CP15R0_REV_MASK         0x0000000f
2064
2065 #define CP15R0_PRODREV_MASK     (CP15R0_PROD_MASK | CP15R0_REV_MASK)
2066
2067 #define PXA255_A0               0x00000106      /* or PXA260_B1 */
2068 #define PXA250_C0               0x00000105      /* or PXA26x_B0 */
2069 #define PXA250_B2               0x00000104
2070 #define PXA250_B1               0x00000103      /* or PXA260_A0 */
2071 #define PXA250_B0               0x00000102
2072 #define PXA250_A1               0x00000101
2073 #define PXA250_A0               0x00000100
2074
2075 #define PXA210_C0               0x00000125
2076 #define PXA210_B2               0x00000124
2077 #define PXA210_B1               0x00000123
2078 #define PXA210_B0               0x00000122
2079 #define IXP425_A0               0x000001c1
2080 #define IXP425_B0               0x000001f1
2081 #define IXP465_AD               0x00000200
2082
2083 /*
2084  *      probe - binds to the platform device
2085  */
2086 static int __init pxa2xx_udc_probe(struct platform_device *pdev)
2087 {
2088         struct pxa2xx_udc *dev = &memory;
2089         int retval, vbus_irq, irq;
2090         u32 chiprev;
2091
2092         /* insist on Intel/ARM/XScale */
2093         asm("mrc%? p15, 0, %0, c0, c0" : "=r" (chiprev));
2094         if ((chiprev & CP15R0_VENDOR_MASK) != CP15R0_XSCALE_VALUE) {
2095                 pr_err("%s: not XScale!\n", driver_name);
2096                 return -ENODEV;
2097         }
2098
2099         /* trigger chiprev-specific logic */
2100         switch (chiprev & CP15R0_PRODREV_MASK) {
2101 #if     defined(CONFIG_ARCH_PXA)
2102         case PXA255_A0:
2103                 dev->has_cfr = 1;
2104                 break;
2105         case PXA250_A0:
2106         case PXA250_A1:
2107                 /* A0/A1 "not released"; ep 13, 15 unusable */
2108                 /* fall through */
2109         case PXA250_B2: case PXA210_B2:
2110         case PXA250_B1: case PXA210_B1:
2111         case PXA250_B0: case PXA210_B0:
2112                 /* OUT-DMA is broken ... */
2113                 /* fall through */
2114         case PXA250_C0: case PXA210_C0:
2115                 break;
2116 #elif   defined(CONFIG_ARCH_IXP4XX)
2117         case IXP425_A0:
2118         case IXP425_B0:
2119         case IXP465_AD:
2120                 dev->has_cfr = 1;
2121                 break;
2122 #endif
2123         default:
2124                 pr_err("%s: unrecognized processor: %08x\n",
2125                         driver_name, chiprev);
2126                 /* iop3xx, ixp4xx, ... */
2127                 return -ENODEV;
2128         }
2129
2130         irq = platform_get_irq(pdev, 0);
2131         if (irq < 0)
2132                 return -ENODEV;
2133
2134 #ifdef  CONFIG_ARCH_PXA
2135         dev->clk = clk_get(&pdev->dev, "UDCCLK");
2136         if (IS_ERR(dev->clk)) {
2137                 retval = PTR_ERR(dev->clk);
2138                 goto err_clk;
2139         }
2140 #endif
2141
2142         pr_debug("%s: IRQ %d%s%s\n", driver_name, irq,
2143                 dev->has_cfr ? "" : " (!cfr)",
2144                 SIZE_STR "(pio)"
2145                 );
2146
2147         /* other non-static parts of init */
2148         dev->dev = &pdev->dev;
2149         dev->mach = pdev->dev.platform_data;
2150
2151         if (dev->mach->gpio_vbus) {
2152                 if ((retval = gpio_request(dev->mach->gpio_vbus,
2153                                 "pxa2xx_udc GPIO VBUS"))) {
2154                         dev_dbg(&pdev->dev,
2155                                 "can't get vbus gpio %d, err: %d\n",
2156                                 dev->mach->gpio_vbus, retval);
2157                         goto err_gpio_vbus;
2158                 }
2159                 gpio_direction_input(dev->mach->gpio_vbus);
2160                 vbus_irq = gpio_to_irq(dev->mach->gpio_vbus);
2161         } else
2162                 vbus_irq = 0;
2163
2164         if (dev->mach->gpio_pullup) {
2165                 if ((retval = gpio_request(dev->mach->gpio_pullup,
2166                                 "pca2xx_udc GPIO PULLUP"))) {
2167                         dev_dbg(&pdev->dev,
2168                                 "can't get pullup gpio %d, err: %d\n",
2169                                 dev->mach->gpio_pullup, retval);
2170                         goto err_gpio_pullup;
2171                 }
2172                 gpio_direction_output(dev->mach->gpio_pullup, 0);
2173         }
2174
2175         init_timer(&dev->timer);
2176         dev->timer.function = udc_watchdog;
2177         dev->timer.data = (unsigned long) dev;
2178
2179         device_initialize(&dev->gadget.dev);
2180         dev->gadget.dev.parent = &pdev->dev;
2181         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
2182
2183         the_controller = dev;
2184         platform_set_drvdata(pdev, dev);
2185
2186         udc_disable(dev);
2187         udc_reinit(dev);
2188
2189         dev->vbus = is_vbus_present();
2190
2191         /* irq setup after old hardware state is cleaned up */
2192         retval = request_irq(irq, pxa2xx_udc_irq,
2193                         IRQF_DISABLED, driver_name, dev);
2194         if (retval != 0) {
2195                 pr_err("%s: can't get irq %d, err %d\n",
2196                         driver_name, irq, retval);
2197                 goto err_irq1;
2198         }
2199         dev->got_irq = 1;
2200
2201 #ifdef CONFIG_ARCH_LUBBOCK
2202         if (machine_is_lubbock()) {
2203                 retval = request_irq(LUBBOCK_USB_DISC_IRQ,
2204                                 lubbock_vbus_irq,
2205                                 IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
2206                                 driver_name, dev);
2207                 if (retval != 0) {
2208                         pr_err("%s: can't get irq %i, err %d\n",
2209                                 driver_name, LUBBOCK_USB_DISC_IRQ, retval);
2210 lubbock_fail0:
2211                         goto err_irq_lub;
2212                 }
2213                 retval = request_irq(LUBBOCK_USB_IRQ,
2214                                 lubbock_vbus_irq,
2215                                 IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
2216                                 driver_name, dev);
2217                 if (retval != 0) {
2218                         pr_err("%s: can't get irq %i, err %d\n",
2219                                 driver_name, LUBBOCK_USB_IRQ, retval);
2220                         free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2221                         goto lubbock_fail0;
2222                 }
2223         } else
2224 #endif
2225         if (vbus_irq) {
2226                 retval = request_irq(vbus_irq, udc_vbus_irq,
2227                                 IRQF_DISABLED | IRQF_SAMPLE_RANDOM |
2228                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
2229                                 driver_name, dev);
2230                 if (retval != 0) {
2231                         pr_err("%s: can't get irq %i, err %d\n",
2232                                 driver_name, vbus_irq, retval);
2233                         goto err_vbus_irq;
2234                 }
2235         }
2236         create_debug_files(dev);
2237
2238         return 0;
2239
2240  err_vbus_irq:
2241 #ifdef  CONFIG_ARCH_LUBBOCK
2242         free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2243  err_irq_lub:
2244 #endif
2245         free_irq(irq, dev);
2246  err_irq1:
2247         if (dev->mach->gpio_pullup)
2248                 gpio_free(dev->mach->gpio_pullup);
2249  err_gpio_pullup:
2250         if (dev->mach->gpio_vbus)
2251                 gpio_free(dev->mach->gpio_vbus);
2252  err_gpio_vbus:
2253 #ifdef  CONFIG_ARCH_PXA
2254         clk_put(dev->clk);
2255  err_clk:
2256 #endif
2257         return retval;
2258 }
2259
2260 static void pxa2xx_udc_shutdown(struct platform_device *_dev)
2261 {
2262         pullup_off();
2263 }
2264
2265 static int __exit pxa2xx_udc_remove(struct platform_device *pdev)
2266 {
2267         struct pxa2xx_udc *dev = platform_get_drvdata(pdev);
2268
2269         if (dev->driver)
2270                 return -EBUSY;
2271
2272         udc_disable(dev);
2273         remove_debug_files(dev);
2274
2275         if (dev->got_irq) {
2276                 free_irq(platform_get_irq(pdev, 0), dev);
2277                 dev->got_irq = 0;
2278         }
2279 #ifdef CONFIG_ARCH_LUBBOCK
2280         if (machine_is_lubbock()) {
2281                 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2282                 free_irq(LUBBOCK_USB_IRQ, dev);
2283         }
2284 #endif
2285         if (dev->mach->gpio_vbus) {
2286                 free_irq(gpio_to_irq(dev->mach->gpio_vbus), dev);
2287                 gpio_free(dev->mach->gpio_vbus);
2288         }
2289         if (dev->mach->gpio_pullup)
2290                 gpio_free(dev->mach->gpio_pullup);
2291
2292 #ifdef  CONFIG_ARCH_PXA
2293         clk_put(dev->clk);
2294 #endif
2295
2296         platform_set_drvdata(pdev, NULL);
2297         the_controller = NULL;
2298         return 0;
2299 }
2300
2301 /*-------------------------------------------------------------------------*/
2302
2303 #ifdef  CONFIG_PM
2304
2305 /* USB suspend (controlled by the host) and system suspend (controlled
2306  * by the PXA) don't necessarily work well together.  If USB is active,
2307  * the 48 MHz clock is required; so the system can't enter 33 MHz idle
2308  * mode, or any deeper PM saving state.
2309  *
2310  * For now, we punt and forcibly disconnect from the USB host when PXA
2311  * enters any suspend state.  While we're disconnected, we always disable
2312  * the 48MHz USB clock ... allowing PXA sleep and/or 33 MHz idle states.
2313  * Boards without software pullup control shouldn't use those states.
2314  * VBUS IRQs should probably be ignored so that the PXA device just acts
2315  * "dead" to USB hosts until system resume.
2316  */
2317 static int pxa2xx_udc_suspend(struct platform_device *dev, pm_message_t state)
2318 {
2319         struct pxa2xx_udc       *udc = platform_get_drvdata(dev);
2320
2321         if (!udc->mach->gpio_pullup && !udc->mach->udc_command)
2322                 WARN("USB host won't detect disconnect!\n");
2323         pullup(udc, 0);
2324
2325         return 0;
2326 }
2327
2328 static int pxa2xx_udc_resume(struct platform_device *dev)
2329 {
2330         struct pxa2xx_udc       *udc = platform_get_drvdata(dev);
2331
2332         pullup(udc, 1);
2333
2334         return 0;
2335 }
2336
2337 #else
2338 #define pxa2xx_udc_suspend      NULL
2339 #define pxa2xx_udc_resume       NULL
2340 #endif
2341
2342 /*-------------------------------------------------------------------------*/
2343
2344 static struct platform_driver udc_driver = {
2345         .shutdown       = pxa2xx_udc_shutdown,
2346         .remove         = __exit_p(pxa2xx_udc_remove),
2347         .suspend        = pxa2xx_udc_suspend,
2348         .resume         = pxa2xx_udc_resume,
2349         .driver         = {
2350                 .owner  = THIS_MODULE,
2351                 .name   = "pxa2xx-udc",
2352         },
2353 };
2354
2355 static int __init udc_init(void)
2356 {
2357         pr_info("%s: version %s\n", driver_name, DRIVER_VERSION);
2358         return platform_driver_probe(&udc_driver, pxa2xx_udc_probe);
2359 }
2360 module_init(udc_init);
2361
2362 static void __exit udc_exit(void)
2363 {
2364         platform_driver_unregister(&udc_driver);
2365 }
2366 module_exit(udc_exit);
2367
2368 MODULE_DESCRIPTION(DRIVER_DESC);
2369 MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell");
2370 MODULE_LICENSE("GPL");
2371