git.oblomov.eu Git - linux-2.6/blob - drivers/usb/gadget/pxa25x_udc.c

   1 /*
   2  * Intel PXA25x and IXP4xx on-chip full speed USB device controllers
   3  *
   4  * Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker)
   5  * Copyright (C) 2003 Robert Schwebel, Pengutronix
   6  * Copyright (C) 2003 Benedikt Spranger, Pengutronix
   7  * Copyright (C) 2003 David Brownell
   8  * Copyright (C) 2003 Joshua Wise
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  */
  25
  26 /* #define VERBOSE_DEBUG */
  27
  28 #include <linux/device.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/ioport.h>
  32 #include <linux/types.h>
  33 #include <linux/errno.h>
  34 #include <linux/delay.h>
  35 #include <linux/slab.h>
  36 #include <linux/init.h>
  37 #include <linux/timer.h>
  38 #include <linux/list.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/mm.h>
  41 #include <linux/platform_device.h>
  42 #include <linux/dma-mapping.h>
  43 #include <linux/irq.h>
  44 #include <linux/clk.h>
  45 #include <linux/err.h>
  46 #include <linux/seq_file.h>
  47 #include <linux/debugfs.h>
  48 #include <linux/io.h>
  49
  50 #include <asm/byteorder.h>
  51 #include <asm/dma.h>
  52 #include <asm/gpio.h>
  53 #include <asm/system.h>
  54 #include <asm/mach-types.h>
  55 #include <asm/unaligned.h>
  56
  57 #include <linux/usb/ch9.h>
  58 #include <linux/usb/gadget.h>
  59
  60 /*
  61  * This driver is PXA25x only.  Grab the right register definitions.
  62  */
  63 #ifdef CONFIG_ARCH_PXA
  64 #include <mach/pxa25x-udc.h>
  65 #endif
  66
  67 #include <asm/mach/udc_pxa2xx.h>
  68
  69
  70 /*
  71  * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x
  72  * series processors.  The UDC for the IXP 4xx series is very similar.
  73  * There are fifteen endpoints, in addition to ep0.
  74  *
  75  * Such controller drivers work with a gadget driver.  The gadget driver
  76  * returns descriptors, implements configuration and data protocols used
  77  * by the host to interact with this device, and allocates endpoints to
  78  * the different protocol interfaces.  The controller driver virtualizes
  79  * usb hardware so that the gadget drivers will be more portable.
  80  *
  81  * This UDC hardware wants to implement a bit too much USB protocol, so
  82  * it constrains the sorts of USB configuration change events that work.
  83  * The errata for these chips are misleading; some "fixed" bugs from
  84  * pxa250 a0/a1 b0/b1/b2 sure act like they're still there.
  85  *
  86  * Note that the UDC hardware supports DMA (except on IXP) but that's
  87  * not used here.  IN-DMA (to host) is simple enough, when the data is
  88  * suitably aligned (16 bytes) ... the network stack doesn't do that,
  89  * other software can.  OUT-DMA is buggy in most chip versions, as well
  90  * as poorly designed (data toggle not automatic).  So this driver won't
  91  * bother using DMA.  (Mostly-working IN-DMA support was available in
  92  * kernels before 2.6.23, but was never enabled or well tested.)
  93  */
  94
  95 #define DRIVER_VERSION  "30-June-2007"
  96 #define DRIVER_DESC     "PXA 25x USB Device Controller driver"
  97
  98
  99 static const char driver_name [] = "pxa25x_udc";
 100
 101 static const char ep0name [] = "ep0";
 102
 103
 104 #ifdef CONFIG_ARCH_IXP4XX
 105
 106 /* cpu-specific register addresses are compiled in to this code */
 107 #ifdef CONFIG_ARCH_PXA
 108 #error "Can't configure both IXP and PXA"
 109 #endif
 110
 111 /* IXP doesn't yet support <linux/clk.h> */
 112 #define clk_get(dev,name)       NULL
 113 #define clk_enable(clk)         do { } while (0)
 114 #define clk_disable(clk)        do { } while (0)
 115 #define clk_put(clk)            do { } while (0)
 116
 117 #endif
 118
 119 #include "pxa25x_udc.h"
 120
 121
 122 #ifdef  CONFIG_USB_PXA25X_SMALL
 123 #define SIZE_STR        " (small)"
 124 #else
 125 #define SIZE_STR        ""
 126 #endif
 127
 128 /* ---------------------------------------------------------------------------
 129  *      endpoint related parts of the api to the usb controller hardware,
 130  *      used by gadget driver; and the inner talker-to-hardware core.
 131  * ---------------------------------------------------------------------------
 132  */
 133
 134 static void pxa25x_ep_fifo_flush (struct usb_ep *ep);
 135 static void nuke (struct pxa25x_ep *, int status);
 136
 137 /* one GPIO should be used to detect VBUS from the host */
 138 static int is_vbus_present(void)
 139 {
 140         struct pxa2xx_udc_mach_info             *mach = the_controller->mach;
 141
 142         if (mach->gpio_vbus) {
 143                 int value = gpio_get_value(mach->gpio_vbus);
 144
 145                 if (mach->gpio_vbus_inverted)
 146                         return !value;
 147                 else
 148                         return !!value;
 149         }
 150         if (mach->udc_is_connected)
 151                 return mach->udc_is_connected();
 152         return 1;
 153 }
 154
 155 /* one GPIO should control a D+ pullup, so host sees this device (or not) */
 156 static void pullup_off(void)
 157 {
 158         struct pxa2xx_udc_mach_info             *mach = the_controller->mach;
 159         int off_level = mach->gpio_pullup_inverted;
 160
 161         if (mach->gpio_pullup)
 162                 gpio_set_value(mach->gpio_pullup, off_level);
 163         else if (mach->udc_command)
 164                 mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
 165 }
 166
 167 static void pullup_on(void)
 168 {
 169         struct pxa2xx_udc_mach_info             *mach = the_controller->mach;
 170         int on_level = !mach->gpio_pullup_inverted;
 171
 172         if (mach->gpio_pullup)
 173                 gpio_set_value(mach->gpio_pullup, on_level);
 174         else if (mach->udc_command)
 175                 mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
 176 }
 177
 178 static void pio_irq_enable(int bEndpointAddress)
 179 {
 180         bEndpointAddress &= 0xf;
 181         if (bEndpointAddress < 8)
 182                 UICR0 &= ~(1 << bEndpointAddress);
 183         else {
 184                 bEndpointAddress -= 8;
 185                 UICR1 &= ~(1 << bEndpointAddress);
 186         }
 187 }
 188
 189 static void pio_irq_disable(int bEndpointAddress)
 190 {
 191         bEndpointAddress &= 0xf;
 192         if (bEndpointAddress < 8)
 193                 UICR0 |= 1 << bEndpointAddress;
 194         else {
 195                 bEndpointAddress -= 8;
 196                 UICR1 |= 1 << bEndpointAddress;
 197         }
 198 }
 199
 200 /* The UDCCR reg contains mask and interrupt status bits,
 201  * so using '|=' isn't safe as it may ack an interrupt.
 202  */
 203 #define UDCCR_MASK_BITS         (UDCCR_REM | UDCCR_SRM | UDCCR_UDE)
 204
 205 static inline void udc_set_mask_UDCCR(int mask)
 206 {
 207         UDCCR = (UDCCR & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS);
 208 }
 209
 210 static inline void udc_clear_mask_UDCCR(int mask)
 211 {
 212         UDCCR = (UDCCR & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS);
 213 }
 214
 215 static inline void udc_ack_int_UDCCR(int mask)
 216 {
 217         /* udccr contains the bits we dont want to change */
 218         __u32 udccr = UDCCR & UDCCR_MASK_BITS;
 219
 220         UDCCR = udccr | (mask & ~UDCCR_MASK_BITS);
 221 }
 222
 223 /*
 224  * endpoint enable/disable
 225  *
 226  * we need to verify the descriptors used to enable endpoints.  since pxa25x
 227  * endpoint configurations are fixed, and are pretty much always enabled,
 228  * there's not a lot to manage here.
 229  *
 230  * because pxa25x can't selectively initialize bulk (or interrupt) endpoints,
 231  * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except
 232  * for a single interface (with only the default altsetting) and for gadget
 233  * drivers that don't halt endpoints (not reset by set_interface).  that also
 234  * means that if you use ISO, you must violate the USB spec rule that all
 235  * iso endpoints must be in non-default altsettings.
 236  */
 237 static int pxa25x_ep_enable (struct usb_ep *_ep,
 238                 const struct usb_endpoint_descriptor *desc)
 239 {
 240         struct pxa25x_ep        *ep;
 241         struct pxa25x_udc       *dev;
 242
 243         ep = container_of (_ep, struct pxa25x_ep, ep);
 244         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 245                         || desc->bDescriptorType != USB_DT_ENDPOINT
 246                         || ep->bEndpointAddress != desc->bEndpointAddress
 247                         || ep->fifo_size < le16_to_cpu
 248                                                 (desc->wMaxPacketSize)) {
 249                 DMSG("%s, bad ep or descriptor\n", __func__);
 250                 return -EINVAL;
 251         }
 252
 253         /* xfer types must match, except that interrupt ~= bulk */
 254         if (ep->bmAttributes != desc->bmAttributes
 255                         && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 256                         && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 257                 DMSG("%s, %s type mismatch\n", __func__, _ep->name);
 258                 return -EINVAL;
 259         }
 260
 261         /* hardware _could_ do smaller, but driver doesn't */
 262         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 263                                 && le16_to_cpu (desc->wMaxPacketSize)
 264                                                 != BULK_FIFO_SIZE)
 265                         || !desc->wMaxPacketSize) {
 266                 DMSG("%s, bad %s maxpacket\n", __func__, _ep->name);
 267                 return -ERANGE;
 268         }
 269
 270         dev = ep->dev;
 271         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 272                 DMSG("%s, bogus device state\n", __func__);
 273                 return -ESHUTDOWN;
 274         }
 275
 276         ep->desc = desc;
 277         ep->stopped = 0;
 278         ep->pio_irqs = 0;
 279         ep->ep.maxpacket = le16_to_cpu (desc->wMaxPacketSize);
 280
 281         /* flush fifo (mostly for OUT buffers) */
 282         pxa25x_ep_fifo_flush (_ep);
 283
 284         /* ... reset halt state too, if we could ... */
 285
 286         DBG(DBG_VERBOSE, "enabled %s\n", _ep->name);
 287         return 0;
 288 }
 289
 290 static int pxa25x_ep_disable (struct usb_ep *_ep)
 291 {
 292         struct pxa25x_ep        *ep;
 293         unsigned long           flags;
 294
 295         ep = container_of (_ep, struct pxa25x_ep, ep);
 296         if (!_ep || !ep->desc) {
 297                 DMSG("%s, %s not enabled\n", __func__,
 298                         _ep ? ep->ep.name : NULL);
 299                 return -EINVAL;
 300         }
 301         local_irq_save(flags);
 302
 303         nuke (ep, -ESHUTDOWN);
 304
 305         /* flush fifo (mostly for IN buffers) */
 306         pxa25x_ep_fifo_flush (_ep);
 307
 308         ep->desc = NULL;
 309         ep->stopped = 1;
 310
 311         local_irq_restore(flags);
 312         DBG(DBG_VERBOSE, "%s disabled\n", _ep->name);
 313         return 0;
 314 }
 315
 316 /*-------------------------------------------------------------------------*/
 317
 318 /* for the pxa25x, these can just wrap kmalloc/kfree.  gadget drivers
 319  * must still pass correctly initialized endpoints, since other controller
 320  * drivers may care about how it's currently set up (dma issues etc).
 321  */
 322
 323 /*
 324  *      pxa25x_ep_alloc_request - allocate a request data structure
 325  */
 326 static struct usb_request *
 327 pxa25x_ep_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
 328 {
 329         struct pxa25x_request *req;
 330
 331         req = kzalloc(sizeof(*req), gfp_flags);
 332         if (!req)
 333                 return NULL;
 334
 335         INIT_LIST_HEAD (&req->queue);
 336         return &req->req;
 337 }
 338
 339
 340 /*
 341  *      pxa25x_ep_free_request - deallocate a request data structure
 342  */
 343 static void
 344 pxa25x_ep_free_request (struct usb_ep *_ep, struct usb_request *_req)
 345 {
 346         struct pxa25x_request   *req;
 347
 348         req = container_of (_req, struct pxa25x_request, req);
 349         WARN_ON(!list_empty (&req->queue));
 350         kfree(req);
 351 }
 352
 353 /*-------------------------------------------------------------------------*/
 354
 355 /*
 356  *      done - retire a request; caller blocked irqs
 357  */
 358 static void done(struct pxa25x_ep *ep, struct pxa25x_request *req, int status)
 359 {
 360         unsigned                stopped = ep->stopped;
 361
 362         list_del_init(&req->queue);
 363
 364         if (likely (req->req.status == -EINPROGRESS))
 365                 req->req.status = status;
 366         else
 367                 status = req->req.status;
 368
 369         if (status && status != -ESHUTDOWN)
 370                 DBG(DBG_VERBOSE, "complete %s req %p stat %d len %u/%u\n",
 371                         ep->ep.name, &req->req, status,
 372                         req->req.actual, req->req.length);
 373
 374         /* don't modify queue heads during completion callback */
 375         ep->stopped = 1;
 376         req->req.complete(&ep->ep, &req->req);
 377         ep->stopped = stopped;
 378 }
 379
 380
 381 static inline void ep0_idle (struct pxa25x_udc *dev)
 382 {
 383         dev->ep0state = EP0_IDLE;
 384 }
 385
 386 static int
 387 write_packet(volatile u32 *uddr, struct pxa25x_request *req, unsigned max)
 388 {
 389         u8              *buf;
 390         unsigned        length, count;
 391
 392         buf = req->req.buf + req->req.actual;
 393         prefetch(buf);
 394
 395         /* how big will this packet be? */
 396         length = min(req->req.length - req->req.actual, max);
 397         req->req.actual += length;
 398
 399         count = length;
 400         while (likely(count--))
 401                 *uddr = *buf++;
 402
 403         return length;
 404 }
 405
 406 /*
 407  * write to an IN endpoint fifo, as many packets as possible.
 408  * irqs will use this to write the rest later.
 409  * caller guarantees at least one packet buffer is ready (or a zlp).
 410  */
 411 static int
 412 write_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
 413 {
 414         unsigned                max;
 415
 416         max = le16_to_cpu(ep->desc->wMaxPacketSize);
 417         do {
 418                 unsigned        count;
 419                 int             is_last, is_short;
 420
 421                 count = write_packet(ep->reg_uddr, req, max);
 422
 423                 /* last packet is usually short (or a zlp) */
 424                 if (unlikely (count != max))
 425                         is_last = is_short = 1;
 426                 else {
 427                         if (likely(req->req.length != req->req.actual)
 428                                         || req->req.zero)
 429                                 is_last = 0;
 430                         else
 431                                 is_last = 1;
 432                         /* interrupt/iso maxpacket may not fill the fifo */
 433                         is_short = unlikely (max < ep->fifo_size);
 434                 }
 435
 436                 DBG(DBG_VERY_NOISY, "wrote %s %d bytes%s%s %d left %p\n",
 437                         ep->ep.name, count,
 438                         is_last ? "/L" : "", is_short ? "/S" : "",
 439                         req->req.length - req->req.actual, req);
 440
 441                 /* let loose that packet. maybe try writing another one,
 442                  * double buffering might work.  TSP, TPC, and TFS
 443                  * bit values are the same for all normal IN endpoints.
 444                  */
 445                 *ep->reg_udccs = UDCCS_BI_TPC;
 446                 if (is_short)
 447                         *ep->reg_udccs = UDCCS_BI_TSP;
 448
 449                 /* requests complete when all IN data is in the FIFO */
 450                 if (is_last) {
 451                         done (ep, req, 0);
 452                         if (list_empty(&ep->queue))
 453                                 pio_irq_disable (ep->bEndpointAddress);
 454                         return 1;
 455                 }
 456
 457                 // TODO experiment: how robust can fifo mode tweaking be?
 458                 // double buffering is off in the default fifo mode, which
 459                 // prevents TFS from being set here.
 460
 461         } while (*ep->reg_udccs & UDCCS_BI_TFS);
 462         return 0;
 463 }
 464
 465 /* caller asserts req->pending (ep0 irq status nyet cleared); starts
 466  * ep0 data stage.  these chips want very simple state transitions.
 467  */
 468 static inline
 469 void ep0start(struct pxa25x_udc *dev, u32 flags, const char *tag)
 470 {
 471         UDCCS0 = flags|UDCCS0_SA|UDCCS0_OPR;
 472         USIR0 = USIR0_IR0;
 473         dev->req_pending = 0;
 474         DBG(DBG_VERY_NOISY, "%s %s, %02x/%02x\n",
 475                 __func__, tag, UDCCS0, flags);
 476 }
 477
 478 static int
 479 write_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
 480 {
 481         unsigned        count;
 482         int             is_short;
 483
 484         count = write_packet(&UDDR0, req, EP0_FIFO_SIZE);
 485         ep->dev->stats.write.bytes += count;
 486
 487         /* last packet "must be" short (or a zlp) */
 488         is_short = (count != EP0_FIFO_SIZE);
 489
 490         DBG(DBG_VERY_NOISY, "ep0in %d bytes %d left %p\n", count,
 491                 req->req.length - req->req.actual, req);
 492
 493         if (unlikely (is_short)) {
 494                 if (ep->dev->req_pending)
 495                         ep0start(ep->dev, UDCCS0_IPR, "short IN");
 496                 else
 497                         UDCCS0 = UDCCS0_IPR;
 498
 499                 count = req->req.length;
 500                 done (ep, req, 0);
 501                 ep0_idle(ep->dev);
 502 #ifndef CONFIG_ARCH_IXP4XX
 503 #if 1
 504                 /* This seems to get rid of lost status irqs in some cases:
 505                  * host responds quickly, or next request involves config
 506                  * change automagic, or should have been hidden, or ...
 507                  *
 508                  * FIXME get rid of all udelays possible...
 509                  */
 510                 if (count >= EP0_FIFO_SIZE) {
 511                         count = 100;
 512                         do {
 513                                 if ((UDCCS0 & UDCCS0_OPR) != 0) {
 514                                         /* clear OPR, generate ack */
 515                                         UDCCS0 = UDCCS0_OPR;
 516                                         break;
 517                                 }
 518                                 count--;
 519                                 udelay(1);
 520                         } while (count);
 521                 }
 522 #endif
 523 #endif
 524         } else if (ep->dev->req_pending)
 525                 ep0start(ep->dev, 0, "IN");
 526         return is_short;
 527 }
 528
 529
 530 /*
 531  * read_fifo -  unload packet(s) from the fifo we use for usb OUT
 532  * transfers and put them into the request.  caller should have made
 533  * sure there's at least one packet ready.
 534  *
 535  * returns true if the request completed because of short packet or the
 536  * request buffer having filled (and maybe overran till end-of-packet).
 537  */
 538 static int
 539 read_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
 540 {
 541         for (;;) {
 542                 u32             udccs;
 543                 u8              *buf;
 544                 unsigned        bufferspace, count, is_short;
 545
 546                 /* make sure there's a packet in the FIFO.
 547                  * UDCCS_{BO,IO}_RPC are all the same bit value.
 548                  * UDCCS_{BO,IO}_RNE are all the same bit value.
 549                  */
 550                 udccs = *ep->reg_udccs;
 551                 if (unlikely ((udccs & UDCCS_BO_RPC) == 0))
 552                         break;
 553                 buf = req->req.buf + req->req.actual;
 554                 prefetchw(buf);
 555                 bufferspace = req->req.length - req->req.actual;
 556
 557                 /* read all bytes from this packet */
 558                 if (likely (udccs & UDCCS_BO_RNE)) {
 559                         count = 1 + (0x0ff & *ep->reg_ubcr);
 560                         req->req.actual += min (count, bufferspace);
 561                 } else /* zlp */
 562                         count = 0;
 563                 is_short = (count < ep->ep.maxpacket);
 564                 DBG(DBG_VERY_NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n",
 565                         ep->ep.name, udccs, count,
 566                         is_short ? "/S" : "",
 567                         req, req->req.actual, req->req.length);
 568                 while (likely (count-- != 0)) {
 569                         u8      byte = (u8) *ep->reg_uddr;
 570
 571                         if (unlikely (bufferspace == 0)) {
 572                                 /* this happens when the driver's buffer
 573                                  * is smaller than what the host sent.
 574                                  * discard the extra data.
 575                                  */
 576                                 if (req->req.status != -EOVERFLOW)
 577                                         DMSG("%s overflow %d\n",
 578                                                 ep->ep.name, count);
 579                                 req->req.status = -EOVERFLOW;
 580                         } else {
 581                                 *buf++ = byte;
 582                                 bufferspace--;
 583                         }
 584                 }
 585                 *ep->reg_udccs =  UDCCS_BO_RPC;
 586                 /* RPC/RSP/RNE could now reflect the other packet buffer */
 587
 588                 /* iso is one request per packet */
 589                 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 590                         if (udccs & UDCCS_IO_ROF)
 591                                 req->req.status = -EHOSTUNREACH;
 592                         /* more like "is_done" */
 593                         is_short = 1;
 594                 }
 595
 596                 /* completion */
 597                 if (is_short || req->req.actual == req->req.length) {
 598                         done (ep, req, 0);
 599                         if (list_empty(&ep->queue))
 600                                 pio_irq_disable (ep->bEndpointAddress);
 601                         return 1;
 602                 }
 603
 604                 /* finished that packet.  the next one may be waiting... */
 605         }
 606         return 0;
 607 }
 608
 609 /*
 610  * special ep0 version of the above.  no UBCR0 or double buffering; status
 611  * handshaking is magic.  most device protocols don't need control-OUT.
 612  * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other
 613  * protocols do use them.
 614  */
 615 static int
 616 read_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
 617 {
 618         u8              *buf, byte;
 619         unsigned        bufferspace;
 620
 621         buf = req->req.buf + req->req.actual;
 622         bufferspace = req->req.length - req->req.actual;
 623
 624         while (UDCCS0 & UDCCS0_RNE) {
 625                 byte = (u8) UDDR0;
 626
 627                 if (unlikely (bufferspace == 0)) {
 628                         /* this happens when the driver's buffer
 629                          * is smaller than what the host sent.
 630                          * discard the extra data.
 631                          */
 632                         if (req->req.status != -EOVERFLOW)
 633                                 DMSG("%s overflow\n", ep->ep.name);
 634                         req->req.status = -EOVERFLOW;
 635                 } else {
 636                         *buf++ = byte;
 637                         req->req.actual++;
 638                         bufferspace--;
 639                 }
 640         }
 641
 642         UDCCS0 = UDCCS0_OPR | UDCCS0_IPR;
 643
 644         /* completion */
 645         if (req->req.actual >= req->req.length)
 646                 return 1;
 647
 648         /* finished that packet.  the next one may be waiting... */
 649         return 0;
 650 }
 651
 652 /*-------------------------------------------------------------------------*/
 653
 654 static int
 655 pxa25x_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 656 {
 657         struct pxa25x_request   *req;
 658         struct pxa25x_ep        *ep;
 659         struct pxa25x_udc       *dev;
 660         unsigned long           flags;
 661
 662         req = container_of(_req, struct pxa25x_request, req);
 663         if (unlikely (!_req || !_req->complete || !_req->buf
 664                         || !list_empty(&req->queue))) {
 665                 DMSG("%s, bad params\n", __func__);
 666                 return -EINVAL;
 667         }
 668
 669         ep = container_of(_ep, struct pxa25x_ep, ep);
 670         if (unlikely (!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 671                 DMSG("%s, bad ep\n", __func__);
 672                 return -EINVAL;
 673         }
 674
 675         dev = ep->dev;
 676         if (unlikely (!dev->driver
 677                         || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
 678                 DMSG("%s, bogus device state\n", __func__);
 679                 return -ESHUTDOWN;
 680         }
 681
 682         /* iso is always one packet per request, that's the only way
 683          * we can report per-packet status.  that also helps with dma.
 684          */
 685         if (unlikely (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
 686                         && req->req.length > le16_to_cpu
 687                                                 (ep->desc->wMaxPacketSize)))
 688                 return -EMSGSIZE;
 689
 690         DBG(DBG_NOISY, "%s queue req %p, len %d buf %p\n",
 691                 _ep->name, _req, _req->length, _req->buf);
 692
 693         local_irq_save(flags);
 694
 695         _req->status = -EINPROGRESS;
 696         _req->actual = 0;
 697
 698         /* kickstart this i/o queue? */
 699         if (list_empty(&ep->queue) && !ep->stopped) {
 700                 if (ep->desc == NULL/* ep0 */) {
 701                         unsigned        length = _req->length;
 702
 703                         switch (dev->ep0state) {
 704                         case EP0_IN_DATA_PHASE:
 705                                 dev->stats.write.ops++;
 706                                 if (write_ep0_fifo(ep, req))
 707                                         req = NULL;
 708                                 break;
 709
 710                         case EP0_OUT_DATA_PHASE:
 711                                 dev->stats.read.ops++;
 712                                 /* messy ... */
 713                                 if (dev->req_config) {
 714                                         DBG(DBG_VERBOSE, "ep0 config ack%s\n",
 715                                                 dev->has_cfr ?  "" : " raced");
 716                                         if (dev->has_cfr)
 717                                                 UDCCFR = UDCCFR_AREN|UDCCFR_ACM
 718                                                         |UDCCFR_MB1;
 719                                         done(ep, req, 0);
 720                                         dev->ep0state = EP0_END_XFER;
 721                                         local_irq_restore (flags);
 722                                         return 0;
 723                                 }
 724                                 if (dev->req_pending)
 725                                         ep0start(dev, UDCCS0_IPR, "OUT");
 726                                 if (length == 0 || ((UDCCS0 & UDCCS0_RNE) != 0
 727                                                 && read_ep0_fifo(ep, req))) {
 728                                         ep0_idle(dev);
 729                                         done(ep, req, 0);
 730                                         req = NULL;
 731                                 }
 732                                 break;
 733
 734                         default:
 735                                 DMSG("ep0 i/o, odd state %d\n", dev->ep0state);
 736                                 local_irq_restore (flags);
 737                                 return -EL2HLT;
 738                         }
 739                 /* can the FIFO can satisfy the request immediately? */
 740                 } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
 741                         if ((*ep->reg_udccs & UDCCS_BI_TFS) != 0
 742                                         && write_fifo(ep, req))
 743                                 req = NULL;
 744                 } else if ((*ep->reg_udccs & UDCCS_BO_RFS) != 0
 745                                 && read_fifo(ep, req)) {
 746                         req = NULL;
 747                 }
 748
 749                 if (likely (req && ep->desc))
 750                         pio_irq_enable(ep->bEndpointAddress);
 751         }
 752
 753         /* pio or dma irq handler advances the queue. */
 754         if (likely(req != NULL))
 755                 list_add_tail(&req->queue, &ep->queue);
 756         local_irq_restore(flags);
 757
 758         return 0;
 759 }
 760
 761
 762 /*
 763  *      nuke - dequeue ALL requests
 764  */
 765 static void nuke(struct pxa25x_ep *ep, int status)
 766 {
 767         struct pxa25x_request *req;
 768
 769         /* called with irqs blocked */
 770         while (!list_empty(&ep->queue)) {
 771                 req = list_entry(ep->queue.next,
 772                                 struct pxa25x_request,
 773                                 queue);
 774                 done(ep, req, status);
 775         }
 776         if (ep->desc)
 777                 pio_irq_disable (ep->bEndpointAddress);
 778 }
 779
 780
 781 /* dequeue JUST ONE request */
 782 static int pxa25x_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 783 {
 784         struct pxa25x_ep        *ep;
 785         struct pxa25x_request   *req;
 786         unsigned long           flags;
 787
 788         ep = container_of(_ep, struct pxa25x_ep, ep);
 789         if (!_ep || ep->ep.name == ep0name)
 790                 return -EINVAL;
 791
 792         local_irq_save(flags);
 793
 794         /* make sure it's actually queued on this endpoint */
 795         list_for_each_entry (req, &ep->queue, queue) {
 796                 if (&req->req == _req)
 797                         break;
 798         }
 799         if (&req->req != _req) {
 800                 local_irq_restore(flags);
 801                 return -EINVAL;
 802         }
 803
 804         done(ep, req, -ECONNRESET);
 805
 806         local_irq_restore(flags);
 807         return 0;
 808 }
 809
 810 /*-------------------------------------------------------------------------*/
 811
 812 static int pxa25x_ep_set_halt(struct usb_ep *_ep, int value)
 813 {
 814         struct pxa25x_ep        *ep;
 815         unsigned long           flags;
 816
 817         ep = container_of(_ep, struct pxa25x_ep, ep);
 818         if (unlikely (!_ep
 819                         || (!ep->desc && ep->ep.name != ep0name))
 820                         || ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 821                 DMSG("%s, bad ep\n", __func__);
 822                 return -EINVAL;
 823         }
 824         if (value == 0) {
 825                 /* this path (reset toggle+halt) is needed to implement
 826                  * SET_INTERFACE on normal hardware.  but it can't be
 827                  * done from software on the PXA UDC, and the hardware
 828                  * forgets to do it as part of SET_INTERFACE automagic.
 829                  */
 830                 DMSG("only host can clear %s halt\n", _ep->name);
 831                 return -EROFS;
 832         }
 833
 834         local_irq_save(flags);
 835
 836         if ((ep->bEndpointAddress & USB_DIR_IN) != 0
 837                         && ((*ep->reg_udccs & UDCCS_BI_TFS) == 0
 838                            || !list_empty(&ep->queue))) {
 839                 local_irq_restore(flags);
 840                 return -EAGAIN;
 841         }
 842
 843         /* FST bit is the same for control, bulk in, bulk out, interrupt in */
 844         *ep->reg_udccs = UDCCS_BI_FST|UDCCS_BI_FTF;
 845
 846         /* ep0 needs special care */
 847         if (!ep->desc) {
 848                 start_watchdog(ep->dev);
 849                 ep->dev->req_pending = 0;
 850                 ep->dev->ep0state = EP0_STALL;
 851
 852         /* and bulk/intr endpoints like dropping stalls too */
 853         } else {
 854                 unsigned i;
 855                 for (i = 0; i < 1000; i += 20) {
 856                         if (*ep->reg_udccs & UDCCS_BI_SST)
 857                                 break;
 858                         udelay(20);
 859                 }
 860         }
 861         local_irq_restore(flags);
 862
 863         DBG(DBG_VERBOSE, "%s halt\n", _ep->name);
 864         return 0;
 865 }
 866
 867 static int pxa25x_ep_fifo_status(struct usb_ep *_ep)
 868 {
 869         struct pxa25x_ep        *ep;
 870
 871         ep = container_of(_ep, struct pxa25x_ep, ep);
 872         if (!_ep) {
 873                 DMSG("%s, bad ep\n", __func__);
 874                 return -ENODEV;
 875         }
 876         /* pxa can't report unclaimed bytes from IN fifos */
 877         if ((ep->bEndpointAddress & USB_DIR_IN) != 0)
 878                 return -EOPNOTSUPP;
 879         if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN
 880                         || (*ep->reg_udccs & UDCCS_BO_RFS) == 0)
 881                 return 0;
 882         else
 883                 return (*ep->reg_ubcr & 0xfff) + 1;
 884 }
 885
 886 static void pxa25x_ep_fifo_flush(struct usb_ep *_ep)
 887 {
 888         struct pxa25x_ep        *ep;
 889
 890         ep = container_of(_ep, struct pxa25x_ep, ep);
 891         if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) {
 892                 DMSG("%s, bad ep\n", __func__);
 893                 return;
 894         }
 895
 896         /* toggle and halt bits stay unchanged */
 897
 898         /* for OUT, just read and discard the FIFO contents. */
 899         if ((ep->bEndpointAddress & USB_DIR_IN) == 0) {
 900                 while (((*ep->reg_udccs) & UDCCS_BO_RNE) != 0)
 901                         (void) *ep->reg_uddr;
 902                 return;
 903         }
 904
 905         /* most IN status is the same, but ISO can't stall */
 906         *ep->reg_udccs = UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR
 907                 | (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
 908                         ? 0 : UDCCS_BI_SST;
 909 }
 910
 911
 912 static struct usb_ep_ops pxa25x_ep_ops = {
 913         .enable         = pxa25x_ep_enable,
 914         .disable        = pxa25x_ep_disable,
 915
 916         .alloc_request  = pxa25x_ep_alloc_request,
 917         .free_request   = pxa25x_ep_free_request,
 918
 919         .queue          = pxa25x_ep_queue,
 920         .dequeue        = pxa25x_ep_dequeue,
 921
 922         .set_halt       = pxa25x_ep_set_halt,
 923         .fifo_status    = pxa25x_ep_fifo_status,
 924         .fifo_flush     = pxa25x_ep_fifo_flush,
 925 };
 926
 927
 928 /* ---------------------------------------------------------------------------
 929  *      device-scoped parts of the api to the usb controller hardware
 930  * ---------------------------------------------------------------------------
 931  */
 932
 933 static int pxa25x_udc_get_frame(struct usb_gadget *_gadget)
 934 {
 935         return ((UFNRH & 0x07) << 8) | (UFNRL & 0xff);
 936 }
 937
 938 static int pxa25x_udc_wakeup(struct usb_gadget *_gadget)
 939 {
 940         /* host may not have enabled remote wakeup */
 941         if ((UDCCS0 & UDCCS0_DRWF) == 0)
 942                 return -EHOSTUNREACH;
 943         udc_set_mask_UDCCR(UDCCR_RSM);
 944         return 0;
 945 }
 946
 947 static void stop_activity(struct pxa25x_udc *, struct usb_gadget_driver *);
 948 static void udc_enable (struct pxa25x_udc *);
 949 static void udc_disable(struct pxa25x_udc *);
 950
 951 /* We disable the UDC -- and its 48 MHz clock -- whenever it's not
 952  * in active use.
 953  */
 954 static int pullup(struct pxa25x_udc *udc)
 955 {
 956         int is_active = udc->vbus && udc->pullup && !udc->suspended;
 957         DMSG("%s\n", is_active ? "active" : "inactive");
 958         if (is_active) {
 959                 if (!udc->active) {
 960                         udc->active = 1;
 961                         /* Enable clock for USB device */
 962                         clk_enable(udc->clk);
 963                         udc_enable(udc);
 964                 }
 965         } else {
 966                 if (udc->active) {
 967                         if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
 968                                 DMSG("disconnect %s\n", udc->driver
 969                                         ? udc->driver->driver.name
 970                                         : "(no driver)");
 971                                 stop_activity(udc, udc->driver);
 972                         }
 973                         udc_disable(udc);
 974                         /* Disable clock for USB device */
 975                         clk_disable(udc->clk);
 976                         udc->active = 0;
 977                 }
 978
 979         }
 980         return 0;
 981 }
 982
 983 /* VBUS reporting logically comes from a transceiver */
 984 static int pxa25x_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
 985 {
 986         struct pxa25x_udc       *udc;
 987
 988         udc = container_of(_gadget, struct pxa25x_udc, gadget);
 989         udc->vbus = is_active;
 990         DMSG("vbus %s\n", is_active ? "supplied" : "inactive");
 991         pullup(udc);
 992         return 0;
 993 }
 994
 995 /* drivers may have software control over D+ pullup */
 996 static int pxa25x_udc_pullup(struct usb_gadget *_gadget, int is_active)
 997 {
 998         struct pxa25x_udc       *udc;
 999
1000         udc = container_of(_gadget, struct pxa25x_udc, gadget);
1001
1002         /* not all boards support pullup control */
1003         if (!udc->mach->gpio_pullup && !udc->mach->udc_command)
1004                 return -EOPNOTSUPP;
1005
1006         udc->pullup = (is_active != 0);
1007         pullup(udc);
1008         return 0;
1009 }
1010
1011 static const struct usb_gadget_ops pxa25x_udc_ops = {
1012         .get_frame      = pxa25x_udc_get_frame,
1013         .wakeup         = pxa25x_udc_wakeup,
1014         .vbus_session   = pxa25x_udc_vbus_session,
1015         .pullup         = pxa25x_udc_pullup,
1016
1017         // .vbus_draw ... boards may consume current from VBUS, up to
1018         // 100-500mA based on config.  the 500uA suspend ceiling means
1019         // that exclusively vbus-powered PXA designs violate USB specs.
1020 };
1021
1022 /*-------------------------------------------------------------------------*/
1023
1024 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1025
1026 static int
1027 udc_seq_show(struct seq_file *m, void *_d)
1028 {
1029         struct pxa25x_udc       *dev = m->private;
1030         unsigned long           flags;
1031         int                     i;
1032         u32                     tmp;
1033
1034         local_irq_save(flags);
1035
1036         /* basic device status */
1037         seq_printf(m, DRIVER_DESC "\n"
1038                 "%s version: %s\nGadget driver: %s\nHost %s\n\n",
1039                 driver_name, DRIVER_VERSION SIZE_STR "(pio)",
1040                 dev->driver ? dev->driver->driver.name : "(none)",
1041                 is_vbus_present() ? "full speed" : "disconnected");
1042
1043         /* registers for device and ep0 */
1044         seq_printf(m,
1045                 "uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
1046                 UICR1, UICR0, USIR1, USIR0, UFNRH, UFNRL);
1047
1048         tmp = UDCCR;
1049         seq_printf(m,
1050                 "udccr %02X =%s%s%s%s%s%s%s%s\n", tmp,
1051                 (tmp & UDCCR_REM) ? " rem" : "",
1052                 (tmp & UDCCR_RSTIR) ? " rstir" : "",
1053                 (tmp & UDCCR_SRM) ? " srm" : "",
1054                 (tmp & UDCCR_SUSIR) ? " susir" : "",
1055                 (tmp & UDCCR_RESIR) ? " resir" : "",
1056                 (tmp & UDCCR_RSM) ? " rsm" : "",
1057                 (tmp & UDCCR_UDA) ? " uda" : "",
1058                 (tmp & UDCCR_UDE) ? " ude" : "");
1059
1060         tmp = UDCCS0;
1061         seq_printf(m,
1062                 "udccs0 %02X =%s%s%s%s%s%s%s%s\n", tmp,
1063                 (tmp & UDCCS0_SA) ? " sa" : "",
1064                 (tmp & UDCCS0_RNE) ? " rne" : "",
1065                 (tmp & UDCCS0_FST) ? " fst" : "",
1066                 (tmp & UDCCS0_SST) ? " sst" : "",
1067                 (tmp & UDCCS0_DRWF) ? " dwrf" : "",
1068                 (tmp & UDCCS0_FTF) ? " ftf" : "",
1069                 (tmp & UDCCS0_IPR) ? " ipr" : "",
1070                 (tmp & UDCCS0_OPR) ? " opr" : "");
1071
1072         if (dev->has_cfr) {
1073                 tmp = UDCCFR;
1074                 seq_printf(m,
1075                         "udccfr %02X =%s%s\n", tmp,
1076                         (tmp & UDCCFR_AREN) ? " aren" : "",
1077                         (tmp & UDCCFR_ACM) ? " acm" : "");
1078         }
1079
1080         if (!is_vbus_present() || !dev->driver)
1081                 goto done;
1082
1083         seq_printf(m, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n",
1084                 dev->stats.write.bytes, dev->stats.write.ops,
1085                 dev->stats.read.bytes, dev->stats.read.ops,
1086                 dev->stats.irqs);
1087
1088         /* dump endpoint queues */
1089         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1090                 struct pxa25x_ep        *ep = &dev->ep [i];
1091                 struct pxa25x_request   *req;
1092
1093                 if (i != 0) {
1094                         const struct usb_endpoint_descriptor    *desc;
1095
1096                         desc = ep->desc;
1097                         if (!desc)
1098                                 continue;
1099                         tmp = *dev->ep [i].reg_udccs;
1100                         seq_printf(m,
1101                                 "%s max %d %s udccs %02x irqs %lu\n",
1102                                 ep->ep.name, le16_to_cpu(desc->wMaxPacketSize),
1103                                 "pio", tmp, ep->pio_irqs);
1104                         /* TODO translate all five groups of udccs bits! */
1105
1106                 } else /* ep0 should only have one transfer queued */
1107                         seq_printf(m, "ep0 max 16 pio irqs %lu\n",
1108                                 ep->pio_irqs);
1109
1110                 if (list_empty(&ep->queue)) {
1111                         seq_printf(m, "\t(nothing queued)\n");
1112                         continue;
1113                 }
1114                 list_for_each_entry(req, &ep->queue, queue) {
1115                         seq_printf(m,
1116                                         "\treq %p len %d/%d buf %p\n",
1117                                         &req->req, req->req.actual,
1118                                         req->req.length, req->req.buf);
1119                 }
1120         }
1121
1122 done:
1123         local_irq_restore(flags);
1124         return 0;
1125 }
1126
1127 static int
1128 udc_debugfs_open(struct inode *inode, struct file *file)
1129 {
1130         return single_open(file, udc_seq_show, inode->i_private);
1131 }
1132
1133 static const struct file_operations debug_fops = {
1134         .open           = udc_debugfs_open,
1135         .read           = seq_read,
1136         .llseek         = seq_lseek,
1137         .release        = single_release,
1138         .owner          = THIS_MODULE,
1139 };
1140
1141 #define create_debug_files(dev) \
1142         do { \
1143                 dev->debugfs_udc = debugfs_create_file(dev->gadget.name, \
1144                         S_IRUGO, NULL, dev, &debug_fops); \
1145         } while (0)
1146 #define remove_debug_files(dev) \
1147         do { \
1148                 if (dev->debugfs_udc) \
1149                         debugfs_remove(dev->debugfs_udc); \
1150         } while (0)
1151
1152 #else   /* !CONFIG_USB_GADGET_DEBUG_FILES */
1153
1154 #define create_debug_files(dev) do {} while (0)
1155 #define remove_debug_files(dev) do {} while (0)
1156
1157 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1158
1159 /*-------------------------------------------------------------------------*/
1160
1161 /*
1162  *      udc_disable - disable USB device controller
1163  */
1164 static void udc_disable(struct pxa25x_udc *dev)
1165 {
1166         /* block all irqs */
1167         udc_set_mask_UDCCR(UDCCR_SRM|UDCCR_REM);
1168         UICR0 = UICR1 = 0xff;
1169         UFNRH = UFNRH_SIM;
1170
1171         /* if hardware supports it, disconnect from usb */
1172         pullup_off();
1173
1174         udc_clear_mask_UDCCR(UDCCR_UDE);
1175
1176         ep0_idle (dev);
1177         dev->gadget.speed = USB_SPEED_UNKNOWN;
1178 }
1179
1180
1181 /*
1182  *      udc_reinit - initialize software state
1183  */
1184 static void udc_reinit(struct pxa25x_udc *dev)
1185 {
1186         u32     i;
1187
1188         /* device/ep0 records init */
1189         INIT_LIST_HEAD (&dev->gadget.ep_list);
1190         INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1191         dev->ep0state = EP0_IDLE;
1192
1193         /* basic endpoint records init */
1194         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1195                 struct pxa25x_ep *ep = &dev->ep[i];
1196
1197                 if (i != 0)
1198                         list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1199
1200                 ep->desc = NULL;
1201                 ep->stopped = 0;
1202                 INIT_LIST_HEAD (&ep->queue);
1203                 ep->pio_irqs = 0;
1204         }
1205
1206         /* the rest was statically initialized, and is read-only */
1207 }
1208
1209 /* until it's enabled, this UDC should be completely invisible
1210  * to any USB host.
1211  */
1212 static void udc_enable (struct pxa25x_udc *dev)
1213 {
1214         udc_clear_mask_UDCCR(UDCCR_UDE);
1215
1216         /* try to clear these bits before we enable the udc */
1217         udc_ack_int_UDCCR(UDCCR_SUSIR|/*UDCCR_RSTIR|*/UDCCR_RESIR);
1218
1219         ep0_idle(dev);
1220         dev->gadget.speed = USB_SPEED_UNKNOWN;
1221         dev->stats.irqs = 0;
1222
1223         /*
1224          * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual:
1225          * - enable UDC
1226          * - if RESET is already in progress, ack interrupt
1227          * - unmask reset interrupt
1228          */
1229         udc_set_mask_UDCCR(UDCCR_UDE);
1230         if (!(UDCCR & UDCCR_UDA))
1231                 udc_ack_int_UDCCR(UDCCR_RSTIR);
1232
1233         if (dev->has_cfr /* UDC_RES2 is defined */) {
1234                 /* pxa255 (a0+) can avoid a set_config race that could
1235                  * prevent gadget drivers from configuring correctly
1236                  */
1237                 UDCCFR = UDCCFR_ACM | UDCCFR_MB1;
1238         } else {
1239                 /* "USB test mode" for pxa250 errata 40-42 (stepping a0, a1)
1240                  * which could result in missing packets and interrupts.
1241                  * supposedly one bit per endpoint, controlling whether it
1242                  * double buffers or not; ACM/AREN bits fit into the holes.
1243                  * zero bits (like USIR0_IRx) disable double buffering.
1244                  */
1245                 UDC_RES1 = 0x00;
1246                 UDC_RES2 = 0x00;
1247         }
1248
1249         /* enable suspend/resume and reset irqs */
1250         udc_clear_mask_UDCCR(UDCCR_SRM | UDCCR_REM);
1251
1252         /* enable ep0 irqs */
1253         UICR0 &= ~UICR0_IM0;
1254
1255         /* if hardware supports it, pullup D+ and wait for reset */
1256         pullup_on();
1257 }
1258
1259
1260 /* when a driver is successfully registered, it will receive
1261  * control requests including set_configuration(), which enables
1262  * non-control requests.  then usb traffic follows until a
1263  * disconnect is reported.  then a host may connect again, or
1264  * the driver might get unbound.
1265  */
1266 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1267 {
1268         struct pxa25x_udc       *dev = the_controller;
1269         int                     retval;
1270
1271         if (!driver
1272                         || driver->speed < USB_SPEED_FULL
1273                         || !driver->bind
1274                         || !driver->disconnect
1275                         || !driver->setup)
1276                 return -EINVAL;
1277         if (!dev)
1278                 return -ENODEV;
1279         if (dev->driver)
1280                 return -EBUSY;
1281
1282         /* first hook up the driver ... */
1283         dev->driver = driver;
1284         dev->gadget.dev.driver = &driver->driver;
1285         dev->pullup = 1;
1286
1287         retval = device_add (&dev->gadget.dev);
1288         if (retval) {
1289 fail:
1290                 dev->driver = NULL;
1291                 dev->gadget.dev.driver = NULL;
1292                 return retval;
1293         }
1294         retval = driver->bind(&dev->gadget);
1295         if (retval) {
1296                 DMSG("bind to driver %s --> error %d\n",
1297                                 driver->driver.name, retval);
1298                 device_del (&dev->gadget.dev);
1299                 goto fail;
1300         }
1301
1302         /* ... then enable host detection and ep0; and we're ready
1303          * for set_configuration as well as eventual disconnect.
1304          */
1305         DMSG("registered gadget driver '%s'\n", driver->driver.name);
1306         pullup(dev);
1307         dump_state(dev);
1308         return 0;
1309 }
1310 EXPORT_SYMBOL(usb_gadget_register_driver);
1311
1312 static void
1313 stop_activity(struct pxa25x_udc *dev, struct usb_gadget_driver *driver)
1314 {
1315         int i;
1316
1317         /* don't disconnect drivers more than once */
1318         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1319                 driver = NULL;
1320         dev->gadget.speed = USB_SPEED_UNKNOWN;
1321
1322         /* prevent new request submissions, kill any outstanding requests  */
1323         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1324                 struct pxa25x_ep *ep = &dev->ep[i];
1325
1326                 ep->stopped = 1;
1327                 nuke(ep, -ESHUTDOWN);
1328         }
1329         del_timer_sync(&dev->timer);
1330
1331         /* report disconnect; the driver is already quiesced */
1332         if (driver)
1333                 driver->disconnect(&dev->gadget);
1334
1335         /* re-init driver-visible data structures */
1336         udc_reinit(dev);
1337 }
1338
1339 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1340 {
1341         struct pxa25x_udc       *dev = the_controller;
1342
1343         if (!dev)
1344                 return -ENODEV;
1345         if (!driver || driver != dev->driver || !driver->unbind)
1346                 return -EINVAL;
1347
1348         local_irq_disable();
1349         dev->pullup = 0;
1350         pullup(dev);
1351         stop_activity(dev, driver);
1352         local_irq_enable();
1353
1354         driver->unbind(&dev->gadget);
1355         dev->gadget.dev.driver = NULL;
1356         dev->driver = NULL;
1357
1358         device_del (&dev->gadget.dev);
1359
1360         DMSG("unregistered gadget driver '%s'\n", driver->driver.name);
1361         dump_state(dev);
1362         return 0;
1363 }
1364 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1365
1366
1367 /*-------------------------------------------------------------------------*/
1368
1369 #ifdef CONFIG_ARCH_LUBBOCK
1370
1371 /* Lubbock has separate connect and disconnect irqs.  More typical designs
1372  * use one GPIO as the VBUS IRQ, and another to control the D+ pullup.
1373  */
1374
1375 static irqreturn_t
1376 lubbock_vbus_irq(int irq, void *_dev)
1377 {
1378         struct pxa25x_udc       *dev = _dev;
1379         int                     vbus;
1380
1381         dev->stats.irqs++;
1382         switch (irq) {
1383         case LUBBOCK_USB_IRQ:
1384                 vbus = 1;
1385                 disable_irq(LUBBOCK_USB_IRQ);
1386                 enable_irq(LUBBOCK_USB_DISC_IRQ);
1387                 break;
1388         case LUBBOCK_USB_DISC_IRQ:
1389                 vbus = 0;
1390                 disable_irq(LUBBOCK_USB_DISC_IRQ);
1391                 enable_irq(LUBBOCK_USB_IRQ);
1392                 break;
1393         default:
1394                 return IRQ_NONE;
1395         }
1396
1397         pxa25x_udc_vbus_session(&dev->gadget, vbus);
1398         return IRQ_HANDLED;
1399 }
1400
1401 #endif
1402
1403 static irqreturn_t udc_vbus_irq(int irq, void *_dev)
1404 {
1405         struct pxa25x_udc       *dev = _dev;
1406
1407         pxa25x_udc_vbus_session(&dev->gadget, is_vbus_present());
1408         return IRQ_HANDLED;
1409 }
1410
1411
1412 /*-------------------------------------------------------------------------*/
1413
1414 static inline void clear_ep_state (struct pxa25x_udc *dev)
1415 {
1416         unsigned i;
1417
1418         /* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint
1419          * fifos, and pending transactions mustn't be continued in any case.
1420          */
1421         for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++)
1422                 nuke(&dev->ep[i], -ECONNABORTED);
1423 }
1424
1425 static void udc_watchdog(unsigned long _dev)
1426 {
1427         struct pxa25x_udc       *dev = (void *)_dev;
1428
1429         local_irq_disable();
1430         if (dev->ep0state == EP0_STALL
1431                         && (UDCCS0 & UDCCS0_FST) == 0
1432                         && (UDCCS0 & UDCCS0_SST) == 0) {
1433                 UDCCS0 = UDCCS0_FST|UDCCS0_FTF;
1434                 DBG(DBG_VERBOSE, "ep0 re-stall\n");
1435                 start_watchdog(dev);
1436         }
1437         local_irq_enable();
1438 }
1439
1440 static void handle_ep0 (struct pxa25x_udc *dev)
1441 {
1442         u32                     udccs0 = UDCCS0;
1443         struct pxa25x_ep        *ep = &dev->ep [0];
1444         struct pxa25x_request   *req;
1445         union {
1446                 struct usb_ctrlrequest  r;
1447                 u8                      raw [8];
1448                 u32                     word [2];
1449         } u;
1450
1451         if (list_empty(&ep->queue))
1452                 req = NULL;
1453         else
1454                 req = list_entry(ep->queue.next, struct pxa25x_request, queue);
1455
1456         /* clear stall status */
1457         if (udccs0 & UDCCS0_SST) {
1458                 nuke(ep, -EPIPE);
1459                 UDCCS0 = UDCCS0_SST;
1460                 del_timer(&dev->timer);
1461                 ep0_idle(dev);
1462         }
1463
1464         /* previous request unfinished?  non-error iff back-to-back ... */
1465         if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) {
1466                 nuke(ep, 0);
1467                 del_timer(&dev->timer);
1468                 ep0_idle(dev);
1469         }
1470
1471         switch (dev->ep0state) {
1472         case EP0_IDLE:
1473                 /* late-breaking status? */
1474                 udccs0 = UDCCS0;
1475
1476                 /* start control request? */
1477                 if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))
1478                                 == (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) {
1479                         int i;
1480
1481                         nuke (ep, -EPROTO);
1482
1483                         /* read SETUP packet */
1484                         for (i = 0; i < 8; i++) {
1485                                 if (unlikely(!(UDCCS0 & UDCCS0_RNE))) {
1486 bad_setup:
1487                                         DMSG("SETUP %d!\n", i);
1488                                         goto stall;
1489                                 }
1490                                 u.raw [i] = (u8) UDDR0;
1491                         }
1492                         if (unlikely((UDCCS0 & UDCCS0_RNE) != 0))
1493                                 goto bad_setup;
1494
1495 got_setup:
1496                         DBG(DBG_VERBOSE, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1497                                 u.r.bRequestType, u.r.bRequest,
1498                                 le16_to_cpu(u.r.wValue),
1499                                 le16_to_cpu(u.r.wIndex),
1500                                 le16_to_cpu(u.r.wLength));
1501
1502                         /* cope with automagic for some standard requests. */
1503                         dev->req_std = (u.r.bRequestType & USB_TYPE_MASK)
1504                                                 == USB_TYPE_STANDARD;
1505                         dev->req_config = 0;
1506                         dev->req_pending = 1;
1507                         switch (u.r.bRequest) {
1508                         /* hardware restricts gadget drivers here! */
1509                         case USB_REQ_SET_CONFIGURATION:
1510                                 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1511                                         /* reflect hardware's automagic
1512                                          * up to the gadget driver.
1513                                          */
1514 config_change:
1515                                         dev->req_config = 1;
1516                                         clear_ep_state(dev);
1517                                         /* if !has_cfr, there's no synch
1518                                          * else use AREN (later) not SA|OPR
1519                                          * USIR0_IR0 acts edge sensitive
1520                                          */
1521                                 }
1522                                 break;
1523                         /* ... and here, even more ... */
1524                         case USB_REQ_SET_INTERFACE:
1525                                 if (u.r.bRequestType == USB_RECIP_INTERFACE) {
1526                                         /* udc hardware is broken by design:
1527                                          *  - altsetting may only be zero;
1528                                          *  - hw resets all interfaces' eps;
1529                                          *  - ep reset doesn't include halt(?).
1530                                          */
1531                                         DMSG("broken set_interface (%d/%d)\n",
1532                                                 le16_to_cpu(u.r.wIndex),
1533                                                 le16_to_cpu(u.r.wValue));
1534                                         goto config_change;
1535                                 }
1536                                 break;
1537                         /* hardware was supposed to hide this */
1538                         case USB_REQ_SET_ADDRESS:
1539                                 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1540                                         ep0start(dev, 0, "address");
1541                                         return;
1542                                 }
1543                                 break;
1544                         }
1545
1546                         if (u.r.bRequestType & USB_DIR_IN)
1547                                 dev->ep0state = EP0_IN_DATA_PHASE;
1548                         else
1549                                 dev->ep0state = EP0_OUT_DATA_PHASE;
1550
1551                         i = dev->driver->setup(&dev->gadget, &u.r);
1552                         if (i < 0) {
1553                                 /* hardware automagic preventing STALL... */
1554                                 if (dev->req_config) {
1555                                         /* hardware sometimes neglects to tell
1556                                          * tell us about config change events,
1557                                          * so later ones may fail...
1558                                          */
1559                                         WARNING("config change %02x fail %d?\n",
1560                                                 u.r.bRequest, i);
1561                                         return;
1562                                         /* TODO experiment:  if has_cfr,
1563                                          * hardware didn't ACK; maybe we
1564                                          * could actually STALL!
1565                                          */
1566                                 }
1567                                 DBG(DBG_VERBOSE, "protocol STALL, "
1568                                         "%02x err %d\n", UDCCS0, i);
1569 stall:
1570                                 /* the watchdog timer helps deal with cases
1571                                  * where udc seems to clear FST wrongly, and
1572                                  * then NAKs instead of STALLing.
1573                                  */
1574                                 ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall");
1575                                 start_watchdog(dev);
1576                                 dev->ep0state = EP0_STALL;
1577
1578                         /* deferred i/o == no response yet */
1579                         } else if (dev->req_pending) {
1580                                 if (likely(dev->ep0state == EP0_IN_DATA_PHASE
1581                                                 || dev->req_std || u.r.wLength))
1582                                         ep0start(dev, 0, "defer");
1583                                 else
1584                                         ep0start(dev, UDCCS0_IPR, "defer/IPR");
1585                         }
1586
1587                         /* expect at least one data or status stage irq */
1588                         return;
1589
1590                 } else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA))
1591                                 == (UDCCS0_OPR|UDCCS0_SA))) {
1592                         unsigned i;
1593
1594                         /* pxa210/250 erratum 131 for B0/B1 says RNE lies.
1595                          * still observed on a pxa255 a0.
1596                          */
1597                         DBG(DBG_VERBOSE, "e131\n");
1598                         nuke(ep, -EPROTO);
1599
1600                         /* read SETUP data, but don't trust it too much */
1601                         for (i = 0; i < 8; i++)
1602                                 u.raw [i] = (u8) UDDR0;
1603                         if ((u.r.bRequestType & USB_RECIP_MASK)
1604                                         > USB_RECIP_OTHER)
1605                                 goto stall;
1606                         if (u.word [0] == 0 && u.word [1] == 0)
1607                                 goto stall;
1608                         goto got_setup;
1609                 } else {
1610                         /* some random early IRQ:
1611                          * - we acked FST
1612                          * - IPR cleared
1613                          * - OPR got set, without SA (likely status stage)
1614                          */
1615                         UDCCS0 = udccs0 & (UDCCS0_SA|UDCCS0_OPR);
1616                 }
1617                 break;
1618         case EP0_IN_DATA_PHASE:                 /* GET_DESCRIPTOR etc */
1619                 if (udccs0 & UDCCS0_OPR) {
1620                         UDCCS0 = UDCCS0_OPR|UDCCS0_FTF;
1621                         DBG(DBG_VERBOSE, "ep0in premature status\n");
1622                         if (req)
1623                                 done(ep, req, 0);
1624                         ep0_idle(dev);
1625                 } else /* irq was IPR clearing */ {
1626                         if (req) {
1627                                 /* this IN packet might finish the request */
1628                                 (void) write_ep0_fifo(ep, req);
1629                         } /* else IN token before response was written */
1630                 }
1631                 break;
1632         case EP0_OUT_DATA_PHASE:                /* SET_DESCRIPTOR etc */
1633                 if (udccs0 & UDCCS0_OPR) {
1634                         if (req) {
1635                                 /* this OUT packet might finish the request */
1636                                 if (read_ep0_fifo(ep, req))
1637                                         done(ep, req, 0);
1638                                 /* else more OUT packets expected */
1639                         } /* else OUT token before read was issued */
1640                 } else /* irq was IPR clearing */ {
1641                         DBG(DBG_VERBOSE, "ep0out premature status\n");
1642                         if (req)
1643                                 done(ep, req, 0);
1644                         ep0_idle(dev);
1645                 }
1646                 break;
1647         case EP0_END_XFER:
1648                 if (req)
1649                         done(ep, req, 0);
1650                 /* ack control-IN status (maybe in-zlp was skipped)
1651                  * also appears after some config change events.
1652                  */
1653                 if (udccs0 & UDCCS0_OPR)
1654                         UDCCS0 = UDCCS0_OPR;
1655                 ep0_idle(dev);
1656                 break;
1657         case EP0_STALL:
1658                 UDCCS0 = UDCCS0_FST;
1659                 break;
1660         }
1661         USIR0 = USIR0_IR0;
1662 }
1663
1664 static void handle_ep(struct pxa25x_ep *ep)
1665 {
1666         struct pxa25x_request   *req;
1667         int                     is_in = ep->bEndpointAddress & USB_DIR_IN;
1668         int                     completed;
1669         u32                     udccs, tmp;
1670
1671         do {
1672                 completed = 0;
1673                 if (likely (!list_empty(&ep->queue)))
1674                         req = list_entry(ep->queue.next,
1675                                         struct pxa25x_request, queue);
1676                 else
1677                         req = NULL;
1678
1679                 // TODO check FST handling
1680
1681                 udccs = *ep->reg_udccs;
1682                 if (unlikely(is_in)) {  /* irq from TPC, SST, or (ISO) TUR */
1683                         tmp = UDCCS_BI_TUR;
1684                         if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1685                                 tmp |= UDCCS_BI_SST;
1686                         tmp &= udccs;
1687                         if (likely (tmp))
1688                                 *ep->reg_udccs = tmp;
1689                         if (req && likely ((udccs & UDCCS_BI_TFS) != 0))
1690                                 completed = write_fifo(ep, req);
1691
1692                 } else {        /* irq from RPC (or for ISO, ROF) */
1693                         if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1694                                 tmp = UDCCS_BO_SST | UDCCS_BO_DME;
1695                         else
1696                                 tmp = UDCCS_IO_ROF | UDCCS_IO_DME;
1697                         tmp &= udccs;
1698                         if (likely(tmp))
1699                                 *ep->reg_udccs = tmp;
1700
1701                         /* fifos can hold packets, ready for reading... */
1702                         if (likely(req)) {
1703                                 completed = read_fifo(ep, req);
1704                         } else
1705                                 pio_irq_disable (ep->bEndpointAddress);
1706                 }
1707                 ep->pio_irqs++;
1708         } while (completed);
1709 }
1710
1711 /*
1712  *      pxa25x_udc_irq - interrupt handler
1713  *
1714  * avoid delays in ep0 processing. the control handshaking isn't always
1715  * under software control (pxa250c0 and the pxa255 are better), and delays
1716  * could cause usb protocol errors.
1717  */
1718 static irqreturn_t
1719 pxa25x_udc_irq(int irq, void *_dev)
1720 {
1721         struct pxa25x_udc       *dev = _dev;
1722         int                     handled;
1723
1724         dev->stats.irqs++;
1725         do {
1726                 u32             udccr = UDCCR;
1727
1728                 handled = 0;
1729
1730                 /* SUSpend Interrupt Request */
1731                 if (unlikely(udccr & UDCCR_SUSIR)) {
1732                         udc_ack_int_UDCCR(UDCCR_SUSIR);
1733                         handled = 1;
1734                         DBG(DBG_VERBOSE, "USB suspend%s\n", is_vbus_present()
1735                                 ? "" : "+disconnect");
1736
1737                         if (!is_vbus_present())
1738                                 stop_activity(dev, dev->driver);
1739                         else if (dev->gadget.speed != USB_SPEED_UNKNOWN
1740                                         && dev->driver
1741                                         && dev->driver->suspend)
1742                                 dev->driver->suspend(&dev->gadget);
1743                         ep0_idle (dev);
1744                 }
1745
1746                 /* RESume Interrupt Request */
1747                 if (unlikely(udccr & UDCCR_RESIR)) {
1748                         udc_ack_int_UDCCR(UDCCR_RESIR);
1749                         handled = 1;
1750                         DBG(DBG_VERBOSE, "USB resume\n");
1751
1752                         if (dev->gadget.speed != USB_SPEED_UNKNOWN
1753                                         && dev->driver
1754                                         && dev->driver->resume
1755                                         && is_vbus_present())
1756                                 dev->driver->resume(&dev->gadget);
1757                 }
1758
1759                 /* ReSeT Interrupt Request - USB reset */
1760                 if (unlikely(udccr & UDCCR_RSTIR)) {
1761                         udc_ack_int_UDCCR(UDCCR_RSTIR);
1762                         handled = 1;
1763
1764                         if ((UDCCR & UDCCR_UDA) == 0) {
1765                                 DBG(DBG_VERBOSE, "USB reset start\n");
1766
1767                                 /* reset driver and endpoints,
1768                                  * in case that's not yet done
1769                                  */
1770                                 stop_activity (dev, dev->driver);
1771
1772                         } else {
1773                                 DBG(DBG_VERBOSE, "USB reset end\n");
1774                                 dev->gadget.speed = USB_SPEED_FULL;
1775                                 memset(&dev->stats, 0, sizeof dev->stats);
1776                                 /* driver and endpoints are still reset */
1777                         }
1778
1779                 } else {
1780                         u32     usir0 = USIR0 & ~UICR0;
1781                         u32     usir1 = USIR1 & ~UICR1;
1782                         int     i;
1783
1784                         if (unlikely (!usir0 && !usir1))
1785                                 continue;
1786
1787                         DBG(DBG_VERY_NOISY, "irq %02x.%02x\n", usir1, usir0);
1788
1789                         /* control traffic */
1790                         if (usir0 & USIR0_IR0) {
1791                                 dev->ep[0].pio_irqs++;
1792                                 handle_ep0(dev);
1793                                 handled = 1;
1794                         }
1795
1796                         /* endpoint data transfers */
1797                         for (i = 0; i < 8; i++) {
1798                                 u32     tmp = 1 << i;
1799
1800                                 if (i && (usir0 & tmp)) {
1801                                         handle_ep(&dev->ep[i]);
1802                                         USIR0 |= tmp;
1803                                         handled = 1;
1804                                 }
1805                                 if (usir1 & tmp) {
1806                                         handle_ep(&dev->ep[i+8]);
1807                                         USIR1 |= tmp;
1808                                         handled = 1;
1809                                 }
1810                         }
1811                 }
1812
1813                 /* we could also ask for 1 msec SOF (SIR) interrupts */
1814
1815         } while (handled);
1816         return IRQ_HANDLED;
1817 }
1818
1819 /*-------------------------------------------------------------------------*/
1820
1821 static void nop_release (struct device *dev)
1822 {
1823         DMSG("%s %s\n", __func__, dev_name(dev));
1824 }
1825
1826 /* this uses load-time allocation and initialization (instead of
1827  * doing it at run-time) to save code, eliminate fault paths, and
1828  * be more obviously correct.
1829  */
1830 static struct pxa25x_udc memory = {
1831         .gadget = {
1832                 .ops            = &pxa25x_udc_ops,
1833                 .ep0            = &memory.ep[0].ep,
1834                 .name           = driver_name,
1835                 .dev = {
1836                         .init_name      = "gadget",
1837                         .release        = nop_release,
1838                 },
1839         },
1840
1841         /* control endpoint */
1842         .ep[0] = {
1843                 .ep = {
1844                         .name           = ep0name,
1845                         .ops            = &pxa25x_ep_ops,
1846                         .maxpacket      = EP0_FIFO_SIZE,
1847                 },
1848                 .dev            = &memory,
1849                 .reg_udccs      = &UDCCS0,
1850                 .reg_uddr       = &UDDR0,
1851         },
1852
1853         /* first group of endpoints */
1854         .ep[1] = {
1855                 .ep = {
1856                         .name           = "ep1in-bulk",
1857                         .ops            = &pxa25x_ep_ops,
1858                         .maxpacket      = BULK_FIFO_SIZE,
1859                 },
1860                 .dev            = &memory,
1861                 .fifo_size      = BULK_FIFO_SIZE,
1862                 .bEndpointAddress = USB_DIR_IN | 1,
1863                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1864                 .reg_udccs      = &UDCCS1,
1865                 .reg_uddr       = &UDDR1,
1866         },
1867         .ep[2] = {
1868                 .ep = {
1869                         .name           = "ep2out-bulk",
1870                         .ops            = &pxa25x_ep_ops,
1871                         .maxpacket      = BULK_FIFO_SIZE,
1872                 },
1873                 .dev            = &memory,
1874                 .fifo_size      = BULK_FIFO_SIZE,
1875                 .bEndpointAddress = 2,
1876                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1877                 .reg_udccs      = &UDCCS2,
1878                 .reg_ubcr       = &UBCR2,
1879                 .reg_uddr       = &UDDR2,
1880         },
1881 #ifndef CONFIG_USB_PXA25X_SMALL
1882         .ep[3] = {
1883                 .ep = {
1884                         .name           = "ep3in-iso",
1885                         .ops            = &pxa25x_ep_ops,
1886                         .maxpacket      = ISO_FIFO_SIZE,
1887                 },
1888                 .dev            = &memory,
1889                 .fifo_size      = ISO_FIFO_SIZE,
1890                 .bEndpointAddress = USB_DIR_IN | 3,
1891                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1892                 .reg_udccs      = &UDCCS3,
1893                 .reg_uddr       = &UDDR3,
1894         },
1895         .ep[4] = {
1896                 .ep = {
1897                         .name           = "ep4out-iso",
1898                         .ops            = &pxa25x_ep_ops,
1899                         .maxpacket      = ISO_FIFO_SIZE,
1900                 },
1901                 .dev            = &memory,
1902                 .fifo_size      = ISO_FIFO_SIZE,
1903                 .bEndpointAddress = 4,
1904                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1905                 .reg_udccs      = &UDCCS4,
1906                 .reg_ubcr       = &UBCR4,
1907                 .reg_uddr       = &UDDR4,
1908         },
1909         .ep[5] = {
1910                 .ep = {
1911                         .name           = "ep5in-int",
1912                         .ops            = &pxa25x_ep_ops,
1913                         .maxpacket      = INT_FIFO_SIZE,
1914                 },
1915                 .dev            = &memory,
1916                 .fifo_size      = INT_FIFO_SIZE,
1917                 .bEndpointAddress = USB_DIR_IN | 5,
1918                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
1919                 .reg_udccs      = &UDCCS5,
1920                 .reg_uddr       = &UDDR5,
1921         },
1922
1923         /* second group of endpoints */
1924         .ep[6] = {
1925                 .ep = {
1926                         .name           = "ep6in-bulk",
1927                         .ops            = &pxa25x_ep_ops,
1928                         .maxpacket      = BULK_FIFO_SIZE,
1929                 },
1930                 .dev            = &memory,
1931                 .fifo_size      = BULK_FIFO_SIZE,
1932                 .bEndpointAddress = USB_DIR_IN | 6,
1933                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1934                 .reg_udccs      = &UDCCS6,
1935                 .reg_uddr       = &UDDR6,
1936         },
1937         .ep[7] = {
1938                 .ep = {
1939                         .name           = "ep7out-bulk",
1940                         .ops            = &pxa25x_ep_ops,
1941                         .maxpacket      = BULK_FIFO_SIZE,
1942                 },
1943                 .dev            = &memory,
1944                 .fifo_size      = BULK_FIFO_SIZE,
1945                 .bEndpointAddress = 7,
1946                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
1947                 .reg_udccs      = &UDCCS7,
1948                 .reg_ubcr       = &UBCR7,
1949                 .reg_uddr       = &UDDR7,
1950         },
1951         .ep[8] = {
1952                 .ep = {
1953                         .name           = "ep8in-iso",
1954                         .ops            = &pxa25x_ep_ops,
1955                         .maxpacket      = ISO_FIFO_SIZE,
1956                 },
1957                 .dev            = &memory,
1958                 .fifo_size      = ISO_FIFO_SIZE,
1959                 .bEndpointAddress = USB_DIR_IN | 8,
1960                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1961                 .reg_udccs      = &UDCCS8,
1962                 .reg_uddr       = &UDDR8,
1963         },
1964         .ep[9] = {
1965                 .ep = {
1966                         .name           = "ep9out-iso",
1967                         .ops            = &pxa25x_ep_ops,
1968                         .maxpacket      = ISO_FIFO_SIZE,
1969                 },
1970                 .dev            = &memory,
1971                 .fifo_size      = ISO_FIFO_SIZE,
1972                 .bEndpointAddress = 9,
1973                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
1974                 .reg_udccs      = &UDCCS9,
1975                 .reg_ubcr       = &UBCR9,
1976                 .reg_uddr       = &UDDR9,
1977         },
1978         .ep[10] = {
1979                 .ep = {
1980                         .name           = "ep10in-int",
1981                         .ops            = &pxa25x_ep_ops,
1982                         .maxpacket      = INT_FIFO_SIZE,
1983                 },
1984                 .dev            = &memory,
1985                 .fifo_size      = INT_FIFO_SIZE,
1986                 .bEndpointAddress = USB_DIR_IN | 10,
1987                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
1988                 .reg_udccs      = &UDCCS10,
1989                 .reg_uddr       = &UDDR10,
1990         },
1991
1992         /* third group of endpoints */
1993         .ep[11] = {
1994                 .ep = {
1995                         .name           = "ep11in-bulk",
1996                         .ops            = &pxa25x_ep_ops,
1997                         .maxpacket      = BULK_FIFO_SIZE,
1998                 },
1999                 .dev            = &memory,
2000                 .fifo_size      = BULK_FIFO_SIZE,
2001                 .bEndpointAddress = USB_DIR_IN | 11,
2002                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2003                 .reg_udccs      = &UDCCS11,
2004                 .reg_uddr       = &UDDR11,
2005         },
2006         .ep[12] = {
2007                 .ep = {
2008                         .name           = "ep12out-bulk",
2009                         .ops            = &pxa25x_ep_ops,
2010                         .maxpacket      = BULK_FIFO_SIZE,
2011                 },
2012                 .dev            = &memory,
2013                 .fifo_size      = BULK_FIFO_SIZE,
2014                 .bEndpointAddress = 12,
2015                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2016                 .reg_udccs      = &UDCCS12,
2017                 .reg_ubcr       = &UBCR12,
2018                 .reg_uddr       = &UDDR12,
2019         },
2020         .ep[13] = {
2021                 .ep = {
2022                         .name           = "ep13in-iso",
2023                         .ops            = &pxa25x_ep_ops,
2024                         .maxpacket      = ISO_FIFO_SIZE,
2025                 },
2026                 .dev            = &memory,
2027                 .fifo_size      = ISO_FIFO_SIZE,
2028                 .bEndpointAddress = USB_DIR_IN | 13,
2029                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2030                 .reg_udccs      = &UDCCS13,
2031                 .reg_uddr       = &UDDR13,
2032         },
2033         .ep[14] = {
2034                 .ep = {
2035                         .name           = "ep14out-iso",
2036                         .ops            = &pxa25x_ep_ops,
2037                         .maxpacket      = ISO_FIFO_SIZE,
2038                 },
2039                 .dev            = &memory,
2040                 .fifo_size      = ISO_FIFO_SIZE,
2041                 .bEndpointAddress = 14,
2042                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2043                 .reg_udccs      = &UDCCS14,
2044                 .reg_ubcr       = &UBCR14,
2045                 .reg_uddr       = &UDDR14,
2046         },
2047         .ep[15] = {
2048                 .ep = {
2049                         .name           = "ep15in-int",
2050                         .ops            = &pxa25x_ep_ops,
2051                         .maxpacket      = INT_FIFO_SIZE,
2052                 },
2053                 .dev            = &memory,
2054                 .fifo_size      = INT_FIFO_SIZE,
2055                 .bEndpointAddress = USB_DIR_IN | 15,
2056                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
2057                 .reg_udccs      = &UDCCS15,
2058                 .reg_uddr       = &UDDR15,
2059         },
2060 #endif /* !CONFIG_USB_PXA25X_SMALL */
2061 };
2062
2063 #define CP15R0_VENDOR_MASK      0xffffe000
2064
2065 #if     defined(CONFIG_ARCH_PXA)
2066 #define CP15R0_XSCALE_VALUE     0x69052000      /* intel/arm/xscale */
2067
2068 #elif   defined(CONFIG_ARCH_IXP4XX)
2069 #define CP15R0_XSCALE_VALUE     0x69054000      /* intel/arm/ixp4xx */
2070
2071 #endif
2072
2073 #define CP15R0_PROD_MASK        0x000003f0
2074 #define PXA25x                  0x00000100      /* and PXA26x */
2075 #define PXA210                  0x00000120
2076
2077 #define CP15R0_REV_MASK         0x0000000f
2078
2079 #define CP15R0_PRODREV_MASK     (CP15R0_PROD_MASK | CP15R0_REV_MASK)
2080
2081 #define PXA255_A0               0x00000106      /* or PXA260_B1 */
2082 #define PXA250_C0               0x00000105      /* or PXA26x_B0 */
2083 #define PXA250_B2               0x00000104
2084 #define PXA250_B1               0x00000103      /* or PXA260_A0 */
2085 #define PXA250_B0               0x00000102
2086 #define PXA250_A1               0x00000101
2087 #define PXA250_A0               0x00000100
2088
2089 #define PXA210_C0               0x00000125
2090 #define PXA210_B2               0x00000124
2091 #define PXA210_B1               0x00000123
2092 #define PXA210_B0               0x00000122
2093 #define IXP425_A0               0x000001c1
2094 #define IXP425_B0               0x000001f1
2095 #define IXP465_AD               0x00000200
2096
2097 /*
2098  *      probe - binds to the platform device
2099  */
2100 static int __init pxa25x_udc_probe(struct platform_device *pdev)
2101 {
2102         struct pxa25x_udc *dev = &memory;
2103         int retval, vbus_irq, irq;
2104         u32 chiprev;
2105
2106         /* insist on Intel/ARM/XScale */
2107         asm("mrc%? p15, 0, %0, c0, c0" : "=r" (chiprev));
2108         if ((chiprev & CP15R0_VENDOR_MASK) != CP15R0_XSCALE_VALUE) {
2109                 pr_err("%s: not XScale!\n", driver_name);
2110                 return -ENODEV;
2111         }
2112
2113         /* trigger chiprev-specific logic */
2114         switch (chiprev & CP15R0_PRODREV_MASK) {
2115 #if     defined(CONFIG_ARCH_PXA)
2116         case PXA255_A0:
2117                 dev->has_cfr = 1;
2118                 break;
2119         case PXA250_A0:
2120         case PXA250_A1:
2121                 /* A0/A1 "not released"; ep 13, 15 unusable */
2122                 /* fall through */
2123         case PXA250_B2: case PXA210_B2:
2124         case PXA250_B1: case PXA210_B1:
2125         case PXA250_B0: case PXA210_B0:
2126                 /* OUT-DMA is broken ... */
2127                 /* fall through */
2128         case PXA250_C0: case PXA210_C0:
2129                 break;
2130 #elif   defined(CONFIG_ARCH_IXP4XX)
2131         case IXP425_A0:
2132         case IXP425_B0:
2133         case IXP465_AD:
2134                 dev->has_cfr = 1;
2135                 break;
2136 #endif
2137         default:
2138                 pr_err("%s: unrecognized processor: %08x\n",
2139                         driver_name, chiprev);
2140                 /* iop3xx, ixp4xx, ... */
2141                 return -ENODEV;
2142         }
2143
2144         irq = platform_get_irq(pdev, 0);
2145         if (irq < 0)
2146                 return -ENODEV;
2147
2148         dev->clk = clk_get(&pdev->dev, NULL);
2149         if (IS_ERR(dev->clk)) {
2150                 retval = PTR_ERR(dev->clk);
2151                 goto err_clk;
2152         }
2153
2154         pr_debug("%s: IRQ %d%s%s\n", driver_name, irq,
2155                 dev->has_cfr ? "" : " (!cfr)",
2156                 SIZE_STR "(pio)"
2157                 );
2158
2159         /* other non-static parts of init */
2160         dev->dev = &pdev->dev;
2161         dev->mach = pdev->dev.platform_data;
2162
2163         if (dev->mach->gpio_vbus) {
2164                 if ((retval = gpio_request(dev->mach->gpio_vbus,
2165                                 "pxa25x_udc GPIO VBUS"))) {
2166                         dev_dbg(&pdev->dev,
2167                                 "can't get vbus gpio %d, err: %d\n",
2168                                 dev->mach->gpio_vbus, retval);
2169                         goto err_gpio_vbus;
2170                 }
2171                 gpio_direction_input(dev->mach->gpio_vbus);
2172                 vbus_irq = gpio_to_irq(dev->mach->gpio_vbus);
2173         } else
2174                 vbus_irq = 0;
2175
2176         if (dev->mach->gpio_pullup) {
2177                 if ((retval = gpio_request(dev->mach->gpio_pullup,
2178                                 "pca25x_udc GPIO PULLUP"))) {
2179                         dev_dbg(&pdev->dev,
2180                                 "can't get pullup gpio %d, err: %d\n",
2181                                 dev->mach->gpio_pullup, retval);
2182                         goto err_gpio_pullup;
2183                 }
2184                 gpio_direction_output(dev->mach->gpio_pullup, 0);
2185         }
2186
2187         init_timer(&dev->timer);
2188         dev->timer.function = udc_watchdog;
2189         dev->timer.data = (unsigned long) dev;
2190
2191         device_initialize(&dev->gadget.dev);
2192         dev->gadget.dev.parent = &pdev->dev;
2193         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
2194
2195         the_controller = dev;
2196         platform_set_drvdata(pdev, dev);
2197
2198         udc_disable(dev);
2199         udc_reinit(dev);
2200
2201         dev->vbus = is_vbus_present();
2202
2203         /* irq setup after old hardware state is cleaned up */
2204         retval = request_irq(irq, pxa25x_udc_irq,
2205                         IRQF_DISABLED, driver_name, dev);
2206         if (retval != 0) {
2207                 pr_err("%s: can't get irq %d, err %d\n",
2208                         driver_name, irq, retval);
2209                 goto err_irq1;
2210         }
2211         dev->got_irq = 1;
2212
2213 #ifdef CONFIG_ARCH_LUBBOCK
2214         if (machine_is_lubbock()) {
2215                 retval = request_irq(LUBBOCK_USB_DISC_IRQ,
2216                                 lubbock_vbus_irq,
2217                                 IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
2218                                 driver_name, dev);
2219                 if (retval != 0) {
2220                         pr_err("%s: can't get irq %i, err %d\n",
2221                                 driver_name, LUBBOCK_USB_DISC_IRQ, retval);
2222 lubbock_fail0:
2223                         goto err_irq_lub;
2224                 }
2225                 retval = request_irq(LUBBOCK_USB_IRQ,
2226                                 lubbock_vbus_irq,
2227                                 IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
2228                                 driver_name, dev);
2229                 if (retval != 0) {
2230                         pr_err("%s: can't get irq %i, err %d\n",
2231                                 driver_name, LUBBOCK_USB_IRQ, retval);
2232                         free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2233                         goto lubbock_fail0;
2234                 }
2235         } else
2236 #endif
2237         if (vbus_irq) {
2238                 retval = request_irq(vbus_irq, udc_vbus_irq,
2239                                 IRQF_DISABLED | IRQF_SAMPLE_RANDOM |
2240                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
2241                                 driver_name, dev);
2242                 if (retval != 0) {
2243                         pr_err("%s: can't get irq %i, err %d\n",
2244                                 driver_name, vbus_irq, retval);
2245                         goto err_vbus_irq;
2246                 }
2247         }
2248         create_debug_files(dev);
2249
2250         return 0;
2251
2252  err_vbus_irq:
2253 #ifdef  CONFIG_ARCH_LUBBOCK
2254         free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2255  err_irq_lub:
2256 #endif
2257         free_irq(irq, dev);
2258  err_irq1:
2259         if (dev->mach->gpio_pullup)
2260                 gpio_free(dev->mach->gpio_pullup);
2261  err_gpio_pullup:
2262         if (dev->mach->gpio_vbus)
2263                 gpio_free(dev->mach->gpio_vbus);
2264  err_gpio_vbus:
2265         clk_put(dev->clk);
2266  err_clk:
2267         return retval;
2268 }
2269
2270 static void pxa25x_udc_shutdown(struct platform_device *_dev)
2271 {
2272         pullup_off();
2273 }
2274
2275 static int __exit pxa25x_udc_remove(struct platform_device *pdev)
2276 {
2277         struct pxa25x_udc *dev = platform_get_drvdata(pdev);
2278
2279         if (dev->driver)
2280                 return -EBUSY;
2281
2282         dev->pullup = 0;
2283         pullup(dev);
2284
2285         remove_debug_files(dev);
2286
2287         if (dev->got_irq) {
2288                 free_irq(platform_get_irq(pdev, 0), dev);
2289                 dev->got_irq = 0;
2290         }
2291 #ifdef CONFIG_ARCH_LUBBOCK
2292         if (machine_is_lubbock()) {
2293                 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2294                 free_irq(LUBBOCK_USB_IRQ, dev);
2295         }
2296 #endif
2297         if (dev->mach->gpio_vbus) {
2298                 free_irq(gpio_to_irq(dev->mach->gpio_vbus), dev);
2299                 gpio_free(dev->mach->gpio_vbus);
2300         }
2301         if (dev->mach->gpio_pullup)
2302                 gpio_free(dev->mach->gpio_pullup);
2303
2304         clk_put(dev->clk);
2305
2306         platform_set_drvdata(pdev, NULL);
2307         the_controller = NULL;
2308         return 0;
2309 }
2310
2311 /*-------------------------------------------------------------------------*/
2312
2313 #ifdef  CONFIG_PM
2314
2315 /* USB suspend (controlled by the host) and system suspend (controlled
2316  * by the PXA) don't necessarily work well together.  If USB is active,
2317  * the 48 MHz clock is required; so the system can't enter 33 MHz idle
2318  * mode, or any deeper PM saving state.
2319  *
2320  * For now, we punt and forcibly disconnect from the USB host when PXA
2321  * enters any suspend state.  While we're disconnected, we always disable
2322  * the 48MHz USB clock ... allowing PXA sleep and/or 33 MHz idle states.
2323  * Boards without software pullup control shouldn't use those states.
2324  * VBUS IRQs should probably be ignored so that the PXA device just acts
2325  * "dead" to USB hosts until system resume.
2326  */
2327 static int pxa25x_udc_suspend(struct platform_device *dev, pm_message_t state)
2328 {
2329         struct pxa25x_udc       *udc = platform_get_drvdata(dev);
2330         unsigned long flags;
2331
2332         if (!udc->mach->gpio_pullup && !udc->mach->udc_command)
2333                 WARNING("USB host won't detect disconnect!\n");
2334         udc->suspended = 1;
2335
2336         local_irq_save(flags);
2337         pullup(udc);
2338         local_irq_restore(flags);
2339
2340         return 0;
2341 }
2342
2343 static int pxa25x_udc_resume(struct platform_device *dev)
2344 {
2345         struct pxa25x_udc       *udc = platform_get_drvdata(dev);
2346         unsigned long flags;
2347
2348         udc->suspended = 0;
2349         local_irq_save(flags);
2350         pullup(udc);
2351         local_irq_restore(flags);
2352
2353         return 0;
2354 }
2355
2356 #else
2357 #define pxa25x_udc_suspend      NULL
2358 #define pxa25x_udc_resume       NULL
2359 #endif
2360
2361 /*-------------------------------------------------------------------------*/
2362
2363 static struct platform_driver udc_driver = {
2364         .shutdown       = pxa25x_udc_shutdown,
2365         .remove         = __exit_p(pxa25x_udc_remove),
2366         .suspend        = pxa25x_udc_suspend,
2367         .resume         = pxa25x_udc_resume,
2368         .driver         = {
2369                 .owner  = THIS_MODULE,
2370                 .name   = "pxa25x-udc",
2371         },
2372 };
2373
2374 static int __init udc_init(void)
2375 {
2376         pr_info("%s: version %s\n", driver_name, DRIVER_VERSION);
2377         return platform_driver_probe(&udc_driver, pxa25x_udc_probe);
2378 }
2379 module_init(udc_init);
2380
2381 static void __exit udc_exit(void)
2382 {
2383         platform_driver_unregister(&udc_driver);
2384 }
2385 module_exit(udc_exit);
2386
2387 MODULE_DESCRIPTION(DRIVER_DESC);
2388 MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell");
2389 MODULE_LICENSE("GPL");
2390 MODULE_ALIAS("platform:pxa25x-udc");