drivers/usb/gadget/pxa2xx_udc.c

   1 /*
   2  * linux/drivers/usb/gadget/pxa2xx_udc.c
   3  * Intel PXA25x and IXP4xx on-chip full speed USB device controllers
   4  *
   5  * Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker)
   6  * Copyright (C) 2003 Robert Schwebel, Pengutronix
   7  * Copyright (C) 2003 Benedikt Spranger, Pengutronix
   8  * Copyright (C) 2003 David Brownell
   9  * Copyright (C) 2003 Joshua Wise
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  *
  25  */
  26
  27 #undef  DEBUG
  28 // #define      VERBOSE DBG_VERBOSE
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/ioport.h>
  33 #include <linux/types.h>
  34 #include <linux/errno.h>
  35 #include <linux/delay.h>
  36 #include <linux/sched.h>
  37 #include <linux/slab.h>
  38 #include <linux/init.h>
  39 #include <linux/timer.h>
  40 #include <linux/list.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/proc_fs.h>
  43 #include <linux/mm.h>
  44 #include <linux/platform_device.h>
  45 #include <linux/dma-mapping.h>
  46
  47 #include <asm/byteorder.h>
  48 #include <asm/dma.h>
  49 #include <asm/io.h>
  50 #include <asm/irq.h>
  51 #include <asm/system.h>
  52 #include <asm/mach-types.h>
  53 #include <asm/unaligned.h>
  54 #include <asm/hardware.h>
  55 #ifdef CONFIG_ARCH_PXA
  56 #include <asm/arch/pxa-regs.h>
  57 #endif
  58
  59 #include <linux/usb_ch9.h>
  60 #include <linux/usb_gadget.h>
  61
  62 #include <asm/arch/udc.h>
  63
  64
  65 /*
  66  * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x
  67  * series processors.  The UDC for the IXP 4xx series is very similar.
  68  * There are fifteen endpoints, in addition to ep0.
  69  *
  70  * Such controller drivers work with a gadget driver.  The gadget driver
  71  * returns descriptors, implements configuration and data protocols used
  72  * by the host to interact with this device, and allocates endpoints to
  73  * the different protocol interfaces.  The controller driver virtualizes
  74  * usb hardware so that the gadget drivers will be more portable.
  75  *
  76  * This UDC hardware wants to implement a bit too much USB protocol, so
  77  * it constrains the sorts of USB configuration change events that work.
  78  * The errata for these chips are misleading; some "fixed" bugs from
  79  * pxa250 a0/a1 b0/b1/b2 sure act like they're still there.
  80  */
  81
  82 #define DRIVER_VERSION  "4-May-2005"
  83 #define DRIVER_DESC     "PXA 25x USB Device Controller driver"
  84
  85
  86 static const char driver_name [] = "pxa2xx_udc";
  87
  88 static const char ep0name [] = "ep0";
  89
  90
  91 // #define      USE_DMA
  92 // #define      USE_OUT_DMA
  93 // #define      DISABLE_TEST_MODE
  94
  95 #ifdef CONFIG_ARCH_IXP4XX
  96 #undef USE_DMA
  97
  98 /* cpu-specific register addresses are compiled in to this code */
  99 #ifdef CONFIG_ARCH_PXA
 100 #error "Can't configure both IXP and PXA"
 101 #endif
 102
 103 #endif
 104
 105 #include "pxa2xx_udc.h"
 106
 107
 108 #ifdef  USE_DMA
 109 static int use_dma = 1;
 110 module_param(use_dma, bool, 0);
 111 MODULE_PARM_DESC (use_dma, "true to use dma");
 112
 113 static void dma_nodesc_handler (int dmach, void *_ep, struct pt_regs *r);
 114 static void kick_dma(struct pxa2xx_ep *ep, struct pxa2xx_request *req);
 115
 116 #ifdef USE_OUT_DMA
 117 #define DMASTR " (dma support)"
 118 #else
 119 #define DMASTR " (dma in)"
 120 #endif
 121
 122 #else   /* !USE_DMA */
 123 #define DMASTR " (pio only)"
 124 #undef  USE_OUT_DMA
 125 #endif
 126
 127 #ifdef  CONFIG_USB_PXA2XX_SMALL
 128 #define SIZE_STR        " (small)"
 129 #else
 130 #define SIZE_STR        ""
 131 #endif
 132
 133 #ifdef DISABLE_TEST_MODE
 134 /* (mode == 0) == no undocumented chip tweaks
 135  * (mode & 1)  == double buffer bulk IN
 136  * (mode & 2)  == double buffer bulk OUT
 137  * ... so mode = 3 (or 7, 15, etc) does it for both
 138  */
 139 static ushort fifo_mode = 0;
 140 module_param(fifo_mode, ushort, 0);
 141 MODULE_PARM_DESC (fifo_mode, "pxa2xx udc fifo mode");
 142 #endif
 143
 144 /* ---------------------------------------------------------------------------
 145  *      endpoint related parts of the api to the usb controller hardware,
 146  *      used by gadget driver; and the inner talker-to-hardware core.
 147  * ---------------------------------------------------------------------------
 148  */
 149
 150 static void pxa2xx_ep_fifo_flush (struct usb_ep *ep);
 151 static void nuke (struct pxa2xx_ep *, int status);
 152
 153 static void pio_irq_enable(int bEndpointAddress)
 154 {
 155         bEndpointAddress &= 0xf;
 156         if (bEndpointAddress < 8)
 157                 UICR0 &= ~(1 << bEndpointAddress);
 158         else {
 159                 bEndpointAddress -= 8;
 160                 UICR1 &= ~(1 << bEndpointAddress);
 161         }
 162 }
 163
 164 static void pio_irq_disable(int bEndpointAddress)
 165 {
 166         bEndpointAddress &= 0xf;
 167         if (bEndpointAddress < 8)
 168                 UICR0 |= 1 << bEndpointAddress;
 169         else {
 170                 bEndpointAddress -= 8;
 171                 UICR1 |= 1 << bEndpointAddress;
 172         }
 173 }
 174
 175 /* The UDCCR reg contains mask and interrupt status bits,
 176  * so using '|=' isn't safe as it may ack an interrupt.
 177  */
 178 #define UDCCR_MASK_BITS         (UDCCR_REM | UDCCR_SRM | UDCCR_UDE)
 179
 180 static inline void udc_set_mask_UDCCR(int mask)
 181 {
 182         UDCCR = (UDCCR & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS);
 183 }
 184
 185 static inline void udc_clear_mask_UDCCR(int mask)
 186 {
 187         UDCCR = (UDCCR & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS);
 188 }
 189
 190 static inline void udc_ack_int_UDCCR(int mask)
 191 {
 192         /* udccr contains the bits we dont want to change */
 193         __u32 udccr = UDCCR & UDCCR_MASK_BITS;
 194
 195         UDCCR = udccr | (mask & ~UDCCR_MASK_BITS);
 196 }
 197
 198 /*
 199  * endpoint enable/disable
 200  *
 201  * we need to verify the descriptors used to enable endpoints.  since pxa2xx
 202  * endpoint configurations are fixed, and are pretty much always enabled,
 203  * there's not a lot to manage here.
 204  *
 205  * because pxa2xx can't selectively initialize bulk (or interrupt) endpoints,
 206  * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except
 207  * for a single interface (with only the default altsetting) and for gadget
 208  * drivers that don't halt endpoints (not reset by set_interface).  that also
 209  * means that if you use ISO, you must violate the USB spec rule that all
 210  * iso endpoints must be in non-default altsettings.
 211  */
 212 static int pxa2xx_ep_enable (struct usb_ep *_ep,
 213                 const struct usb_endpoint_descriptor *desc)
 214 {
 215         struct pxa2xx_ep        *ep;
 216         struct pxa2xx_udc       *dev;
 217
 218         ep = container_of (_ep, struct pxa2xx_ep, ep);
 219         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 220                         || desc->bDescriptorType != USB_DT_ENDPOINT
 221                         || ep->bEndpointAddress != desc->bEndpointAddress
 222                         || ep->fifo_size < le16_to_cpu
 223                                                 (desc->wMaxPacketSize)) {
 224                 DMSG("%s, bad ep or descriptor\n", __FUNCTION__);
 225                 return -EINVAL;
 226         }
 227
 228         /* xfer types must match, except that interrupt ~= bulk */
 229         if (ep->bmAttributes != desc->bmAttributes
 230                         && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 231                         && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 232                 DMSG("%s, %s type mismatch\n", __FUNCTION__, _ep->name);
 233                 return -EINVAL;
 234         }
 235
 236         /* hardware _could_ do smaller, but driver doesn't */
 237         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 238                                 && le16_to_cpu (desc->wMaxPacketSize)
 239                                                 != BULK_FIFO_SIZE)
 240                         || !desc->wMaxPacketSize) {
 241                 DMSG("%s, bad %s maxpacket\n", __FUNCTION__, _ep->name);
 242                 return -ERANGE;
 243         }
 244
 245         dev = ep->dev;
 246         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 247                 DMSG("%s, bogus device state\n", __FUNCTION__);
 248                 return -ESHUTDOWN;
 249         }
 250
 251         ep->desc = desc;
 252         ep->dma = -1;
 253         ep->stopped = 0;
 254         ep->pio_irqs = ep->dma_irqs = 0;
 255         ep->ep.maxpacket = le16_to_cpu (desc->wMaxPacketSize);
 256
 257         /* flush fifo (mostly for OUT buffers) */
 258         pxa2xx_ep_fifo_flush (_ep);
 259
 260         /* ... reset halt state too, if we could ... */
 261
 262 #ifdef  USE_DMA
 263         /* for (some) bulk and ISO endpoints, try to get a DMA channel and
 264          * bind it to the endpoint.  otherwise use PIO.
 265          */
 266         switch (ep->bmAttributes) {
 267         case USB_ENDPOINT_XFER_ISOC:
 268                 if (le16_to_cpu(desc->wMaxPacketSize) % 32)
 269                         break;
 270                 // fall through
 271         case USB_ENDPOINT_XFER_BULK:
 272                 if (!use_dma || !ep->reg_drcmr)
 273                         break;
 274                 ep->dma = pxa_request_dma ((char *)_ep->name,
 275                                 (le16_to_cpu (desc->wMaxPacketSize) > 64)
 276                                         ? DMA_PRIO_MEDIUM /* some iso */
 277                                         : DMA_PRIO_LOW,
 278                                 dma_nodesc_handler, ep);
 279                 if (ep->dma >= 0) {
 280                         *ep->reg_drcmr = DRCMR_MAPVLD | ep->dma;
 281                         DMSG("%s using dma%d\n", _ep->name, ep->dma);
 282                 }
 283         }
 284 #endif
 285
 286         DBG(DBG_VERBOSE, "enabled %s\n", _ep->name);
 287         return 0;
 288 }
 289
 290 static int pxa2xx_ep_disable (struct usb_ep *_ep)
 291 {
 292         struct pxa2xx_ep        *ep;
 293         unsigned long           flags;
 294
 295         ep = container_of (_ep, struct pxa2xx_ep, ep);
 296         if (!_ep || !ep->desc) {
 297                 DMSG("%s, %s not enabled\n", __FUNCTION__,
 298                         _ep ? ep->ep.name : NULL);
 299                 return -EINVAL;
 300         }
 301         local_irq_save(flags);
 302
 303         nuke (ep, -ESHUTDOWN);
 304
 305 #ifdef  USE_DMA
 306         if (ep->dma >= 0) {
 307                 *ep->reg_drcmr = 0;
 308                 pxa_free_dma (ep->dma);
 309                 ep->dma = -1;
 310         }
 311 #endif
 312
 313         /* flush fifo (mostly for IN buffers) */
 314         pxa2xx_ep_fifo_flush (_ep);
 315
 316         ep->desc = NULL;
 317         ep->stopped = 1;
 318
 319         local_irq_restore(flags);
 320         DBG(DBG_VERBOSE, "%s disabled\n", _ep->name);
 321         return 0;
 322 }
 323
 324 /*-------------------------------------------------------------------------*/
 325
 326 /* for the pxa2xx, these can just wrap kmalloc/kfree.  gadget drivers
 327  * must still pass correctly initialized endpoints, since other controller
 328  * drivers may care about how it's currently set up (dma issues etc).
 329  */
 330
 331 /*
 332  *      pxa2xx_ep_alloc_request - allocate a request data structure
 333  */
 334 static struct usb_request *
 335 pxa2xx_ep_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
 336 {
 337         struct pxa2xx_request *req;
 338
 339         req = kzalloc(sizeof(*req), gfp_flags);
 340         if (!req)
 341                 return NULL;
 342
 343         INIT_LIST_HEAD (&req->queue);
 344         return &req->req;
 345 }
 346
 347
 348 /*
 349  *      pxa2xx_ep_free_request - deallocate a request data structure
 350  */
 351 static void
 352 pxa2xx_ep_free_request (struct usb_ep *_ep, struct usb_request *_req)
 353 {
 354         struct pxa2xx_request   *req;
 355
 356         req = container_of (_req, struct pxa2xx_request, req);
 357         WARN_ON (!list_empty (&req->queue));
 358         kfree(req);
 359 }
 360
 361
 362 /* PXA cache needs flushing with DMA I/O (it's dma-incoherent), but there's
 363  * no device-affinity and the heap works perfectly well for i/o buffers.
 364  * It wastes much less memory than dma_alloc_coherent() would, and even
 365  * prevents cacheline (32 bytes wide) sharing problems.
 366  */
 367 static void *
 368 pxa2xx_ep_alloc_buffer(struct usb_ep *_ep, unsigned bytes,
 369         dma_addr_t *dma, gfp_t gfp_flags)
 370 {
 371         char                    *retval;
 372
 373         retval = kmalloc (bytes, gfp_flags & ~(__GFP_DMA|__GFP_HIGHMEM));
 374         if (retval)
 375 #ifdef  USE_DMA
 376                 *dma = virt_to_bus (retval);
 377 #else
 378                 *dma = (dma_addr_t)~0;
 379 #endif
 380         return retval;
 381 }
 382
 383 static void
 384 pxa2xx_ep_free_buffer(struct usb_ep *_ep, void *buf, dma_addr_t dma,
 385                 unsigned bytes)
 386 {
 387         kfree (buf);
 388 }
 389
 390 /*-------------------------------------------------------------------------*/
 391
 392 /*
 393  *      done - retire a request; caller blocked irqs
 394  */
 395 static void done(struct pxa2xx_ep *ep, struct pxa2xx_request *req, int status)
 396 {
 397         unsigned                stopped = ep->stopped;
 398
 399         list_del_init(&req->queue);
 400
 401         if (likely (req->req.status == -EINPROGRESS))
 402                 req->req.status = status;
 403         else
 404                 status = req->req.status;
 405
 406         if (status && status != -ESHUTDOWN)
 407                 DBG(DBG_VERBOSE, "complete %s req %p stat %d len %u/%u\n",
 408                         ep->ep.name, &req->req, status,
 409                         req->req.actual, req->req.length);
 410
 411         /* don't modify queue heads during completion callback */
 412         ep->stopped = 1;
 413         req->req.complete(&ep->ep, &req->req);
 414         ep->stopped = stopped;
 415 }
 416
 417
 418 static inline void ep0_idle (struct pxa2xx_udc *dev)
 419 {
 420         dev->ep0state = EP0_IDLE;
 421 }
 422
 423 static int
 424 write_packet(volatile u32 *uddr, struct pxa2xx_request *req, unsigned max)
 425 {
 426         u8              *buf;
 427         unsigned        length, count;
 428
 429         buf = req->req.buf + req->req.actual;
 430         prefetch(buf);
 431
 432         /* how big will this packet be? */
 433         length = min(req->req.length - req->req.actual, max);
 434         req->req.actual += length;
 435
 436         count = length;
 437         while (likely(count--))
 438                 *uddr = *buf++;
 439
 440         return length;
 441 }
 442
 443 /*
 444  * write to an IN endpoint fifo, as many packets as possible.
 445  * irqs will use this to write the rest later.
 446  * caller guarantees at least one packet buffer is ready (or a zlp).
 447  */
 448 static int
 449 write_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
 450 {
 451         unsigned                max;
 452
 453         max = le16_to_cpu(ep->desc->wMaxPacketSize);
 454         do {
 455                 unsigned        count;
 456                 int             is_last, is_short;
 457
 458                 count = write_packet(ep->reg_uddr, req, max);
 459
 460                 /* last packet is usually short (or a zlp) */
 461                 if (unlikely (count != max))
 462                         is_last = is_short = 1;
 463                 else {
 464                         if (likely(req->req.length != req->req.actual)
 465                                         || req->req.zero)
 466                                 is_last = 0;
 467                         else
 468                                 is_last = 1;
 469                         /* interrupt/iso maxpacket may not fill the fifo */
 470                         is_short = unlikely (max < ep->fifo_size);
 471                 }
 472
 473                 DBG(DBG_VERY_NOISY, "wrote %s %d bytes%s%s %d left %p\n",
 474                         ep->ep.name, count,
 475                         is_last ? "/L" : "", is_short ? "/S" : "",
 476                         req->req.length - req->req.actual, req);
 477
 478                 /* let loose that packet. maybe try writing another one,
 479                  * double buffering might work.  TSP, TPC, and TFS
 480                  * bit values are the same for all normal IN endpoints.
 481                  */
 482                 *ep->reg_udccs = UDCCS_BI_TPC;
 483                 if (is_short)
 484                         *ep->reg_udccs = UDCCS_BI_TSP;
 485
 486                 /* requests complete when all IN data is in the FIFO */
 487                 if (is_last) {
 488                         done (ep, req, 0);
 489                         if (list_empty(&ep->queue) || unlikely(ep->dma >= 0)) {
 490                                 pio_irq_disable (ep->bEndpointAddress);
 491 #ifdef USE_DMA
 492                                 /* unaligned data and zlps couldn't use dma */
 493                                 if (unlikely(!list_empty(&ep->queue))) {
 494                                         req = list_entry(ep->queue.next,
 495                                                 struct pxa2xx_request, queue);
 496                                         kick_dma(ep,req);
 497                                         return 0;
 498                                 }
 499 #endif
 500                         }
 501                         return 1;
 502                 }
 503
 504                 // TODO experiment: how robust can fifo mode tweaking be?
 505                 // double buffering is off in the default fifo mode, which
 506                 // prevents TFS from being set here.
 507
 508         } while (*ep->reg_udccs & UDCCS_BI_TFS);
 509         return 0;
 510 }
 511
 512 /* caller asserts req->pending (ep0 irq status nyet cleared); starts
 513  * ep0 data stage.  these chips want very simple state transitions.
 514  */
 515 static inline
 516 void ep0start(struct pxa2xx_udc *dev, u32 flags, const char *tag)
 517 {
 518         UDCCS0 = flags|UDCCS0_SA|UDCCS0_OPR;
 519         USIR0 = USIR0_IR0;
 520         dev->req_pending = 0;
 521         DBG(DBG_VERY_NOISY, "%s %s, %02x/%02x\n",
 522                 __FUNCTION__, tag, UDCCS0, flags);
 523 }
 524
 525 static int
 526 write_ep0_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
 527 {
 528         unsigned        count;
 529         int             is_short;
 530
 531         count = write_packet(&UDDR0, req, EP0_FIFO_SIZE);
 532         ep->dev->stats.write.bytes += count;
 533
 534         /* last packet "must be" short (or a zlp) */
 535         is_short = (count != EP0_FIFO_SIZE);
 536
 537         DBG(DBG_VERY_NOISY, "ep0in %d bytes %d left %p\n", count,
 538                 req->req.length - req->req.actual, req);
 539
 540         if (unlikely (is_short)) {
 541                 if (ep->dev->req_pending)
 542                         ep0start(ep->dev, UDCCS0_IPR, "short IN");
 543                 else
 544                         UDCCS0 = UDCCS0_IPR;
 545
 546                 count = req->req.length;
 547                 done (ep, req, 0);
 548                 ep0_idle(ep->dev);
 549 #ifndef CONFIG_ARCH_IXP4XX
 550 #if 1
 551                 /* This seems to get rid of lost status irqs in some cases:
 552                  * host responds quickly, or next request involves config
 553                  * change automagic, or should have been hidden, or ...
 554                  *
 555                  * FIXME get rid of all udelays possible...
 556                  */
 557                 if (count >= EP0_FIFO_SIZE) {
 558                         count = 100;
 559                         do {
 560                                 if ((UDCCS0 & UDCCS0_OPR) != 0) {
 561                                         /* clear OPR, generate ack */
 562                                         UDCCS0 = UDCCS0_OPR;
 563                                         break;
 564                                 }
 565                                 count--;
 566                                 udelay(1);
 567                         } while (count);
 568                 }
 569 #endif
 570 #endif
 571         } else if (ep->dev->req_pending)
 572                 ep0start(ep->dev, 0, "IN");
 573         return is_short;
 574 }
 575
 576
 577 /*
 578  * read_fifo -  unload packet(s) from the fifo we use for usb OUT
 579  * transfers and put them into the request.  caller should have made
 580  * sure there's at least one packet ready.
 581  *
 582  * returns true if the request completed because of short packet or the
 583  * request buffer having filled (and maybe overran till end-of-packet).
 584  */
 585 static int
 586 read_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
 587 {
 588         for (;;) {
 589                 u32             udccs;
 590                 u8              *buf;
 591                 unsigned        bufferspace, count, is_short;
 592
 593                 /* make sure there's a packet in the FIFO.
 594                  * UDCCS_{BO,IO}_RPC are all the same bit value.
 595                  * UDCCS_{BO,IO}_RNE are all the same bit value.
 596                  */
 597                 udccs = *ep->reg_udccs;
 598                 if (unlikely ((udccs & UDCCS_BO_RPC) == 0))
 599                         break;
 600                 buf = req->req.buf + req->req.actual;
 601                 prefetchw(buf);
 602                 bufferspace = req->req.length - req->req.actual;
 603
 604                 /* read all bytes from this packet */
 605                 if (likely (udccs & UDCCS_BO_RNE)) {
 606                         count = 1 + (0x0ff & *ep->reg_ubcr);
 607                         req->req.actual += min (count, bufferspace);
 608                 } else /* zlp */
 609                         count = 0;
 610                 is_short = (count < ep->ep.maxpacket);
 611                 DBG(DBG_VERY_NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n",
 612                         ep->ep.name, udccs, count,
 613                         is_short ? "/S" : "",
 614                         req, req->req.actual, req->req.length);
 615                 while (likely (count-- != 0)) {
 616                         u8      byte = (u8) *ep->reg_uddr;
 617
 618                         if (unlikely (bufferspace == 0)) {
 619                                 /* this happens when the driver's buffer
 620                                  * is smaller than what the host sent.
 621                                  * discard the extra data.
 622                                  */
 623                                 if (req->req.status != -EOVERFLOW)
 624                                         DMSG("%s overflow %d\n",
 625                                                 ep->ep.name, count);
 626                                 req->req.status = -EOVERFLOW;
 627                         } else {
 628                                 *buf++ = byte;
 629                                 bufferspace--;
 630                         }
 631                 }
 632                 *ep->reg_udccs =  UDCCS_BO_RPC;
 633                 /* RPC/RSP/RNE could now reflect the other packet buffer */
 634
 635                 /* iso is one request per packet */
 636                 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 637                         if (udccs & UDCCS_IO_ROF)
 638                                 req->req.status = -EHOSTUNREACH;
 639                         /* more like "is_done" */
 640                         is_short = 1;
 641                 }
 642
 643                 /* completion */
 644                 if (is_short || req->req.actual == req->req.length) {
 645                         done (ep, req, 0);
 646                         if (list_empty(&ep->queue))
 647                                 pio_irq_disable (ep->bEndpointAddress);
 648                         return 1;
 649                 }
 650
 651                 /* finished that packet.  the next one may be waiting... */
 652         }
 653         return 0;
 654 }
 655
 656 /*
 657  * special ep0 version of the above.  no UBCR0 or double buffering; status
 658  * handshaking is magic.  most device protocols don't need control-OUT.
 659  * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other
 660  * protocols do use them.
 661  */
 662 static int
 663 read_ep0_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
 664 {
 665         u8              *buf, byte;
 666         unsigned        bufferspace;
 667
 668         buf = req->req.buf + req->req.actual;
 669         bufferspace = req->req.length - req->req.actual;
 670
 671         while (UDCCS0 & UDCCS0_RNE) {
 672                 byte = (u8) UDDR0;
 673
 674                 if (unlikely (bufferspace == 0)) {
 675                         /* this happens when the driver's buffer
 676                          * is smaller than what the host sent.
 677                          * discard the extra data.
 678                          */
 679                         if (req->req.status != -EOVERFLOW)
 680                                 DMSG("%s overflow\n", ep->ep.name);
 681                         req->req.status = -EOVERFLOW;
 682                 } else {
 683                         *buf++ = byte;
 684                         req->req.actual++;
 685                         bufferspace--;
 686                 }
 687         }
 688
 689         UDCCS0 = UDCCS0_OPR | UDCCS0_IPR;
 690
 691         /* completion */
 692         if (req->req.actual >= req->req.length)
 693                 return 1;
 694
 695         /* finished that packet.  the next one may be waiting... */
 696         return 0;
 697 }
 698
 699 #ifdef  USE_DMA
 700
 701 #define MAX_IN_DMA      ((DCMD_LENGTH + 1) - BULK_FIFO_SIZE)
 702
 703 static void
 704 start_dma_nodesc(struct pxa2xx_ep *ep, struct pxa2xx_request *req, int is_in)
 705 {
 706         u32     dcmd = req->req.length;
 707         u32     buf = req->req.dma;
 708         u32     fifo = io_v2p ((u32)ep->reg_uddr);
 709
 710         /* caller guarantees there's a packet or more remaining
 711          *  - IN may end with a short packet (TSP set separately),
 712          *  - OUT is always full length
 713          */
 714         buf += req->req.actual;
 715         dcmd -= req->req.actual;
 716         ep->dma_fixup = 0;
 717
 718         /* no-descriptor mode can be simple for bulk-in, iso-in, iso-out */
 719         DCSR(ep->dma) = DCSR_NODESC;
 720         if (is_in) {
 721                 DSADR(ep->dma) = buf;
 722                 DTADR(ep->dma) = fifo;
 723                 if (dcmd > MAX_IN_DMA)
 724                         dcmd = MAX_IN_DMA;
 725                 else
 726                         ep->dma_fixup = (dcmd % ep->ep.maxpacket) != 0;
 727                 dcmd |= DCMD_BURST32 | DCMD_WIDTH1
 728                         | DCMD_FLOWTRG | DCMD_INCSRCADDR;
 729         } else {
 730 #ifdef USE_OUT_DMA
 731                 DSADR(ep->dma) = fifo;
 732                 DTADR(ep->dma) = buf;
 733                 if (ep->bmAttributes != USB_ENDPOINT_XFER_ISOC)
 734                         dcmd = ep->ep.maxpacket;
 735                 dcmd |= DCMD_BURST32 | DCMD_WIDTH1
 736                         | DCMD_FLOWSRC | DCMD_INCTRGADDR;
 737 #endif
 738         }
 739         DCMD(ep->dma) = dcmd;
 740         DCSR(ep->dma) = DCSR_RUN | DCSR_NODESC
 741                 | (unlikely(is_in)
 742                         ? DCSR_STOPIRQEN        /* use dma_nodesc_handler() */
 743                         : 0);                   /* use handle_ep() */
 744 }
 745
 746 static void kick_dma(struct pxa2xx_ep *ep, struct pxa2xx_request *req)
 747 {
 748         int     is_in = ep->bEndpointAddress & USB_DIR_IN;
 749
 750         if (is_in) {
 751                 /* unaligned tx buffers and zlps only work with PIO */
 752                 if ((req->req.dma & 0x0f) != 0
 753                                 || unlikely((req->req.length - req->req.actual)
 754                                                 == 0)) {
 755                         pio_irq_enable(ep->bEndpointAddress);
 756                         if ((*ep->reg_udccs & UDCCS_BI_TFS) != 0)
 757                                 (void) write_fifo(ep, req);
 758                 } else {
 759                         start_dma_nodesc(ep, req, USB_DIR_IN);
 760                 }
 761         } else {
 762                 if ((req->req.length - req->req.actual) < ep->ep.maxpacket) {
 763                         DMSG("%s short dma read...\n", ep->ep.name);
 764                         /* we're always set up for pio out */
 765                         read_fifo (ep, req);
 766                 } else {
 767                         *ep->reg_udccs = UDCCS_BO_DME
 768                                 | (*ep->reg_udccs & UDCCS_BO_FST);
 769                         start_dma_nodesc(ep, req, USB_DIR_OUT);
 770                 }
 771         }
 772 }
 773
 774 static void cancel_dma(struct pxa2xx_ep *ep)
 775 {
 776         struct pxa2xx_request   *req;
 777         u32                     tmp;
 778
 779         if (DCSR(ep->dma) == 0 || list_empty(&ep->queue))
 780                 return;
 781
 782         DCSR(ep->dma) = 0;
 783         while ((DCSR(ep->dma) & DCSR_STOPSTATE) == 0)
 784                 cpu_relax();
 785
 786         req = list_entry(ep->queue.next, struct pxa2xx_request, queue);
 787         tmp = DCMD(ep->dma) & DCMD_LENGTH;
 788         req->req.actual = req->req.length - (tmp & DCMD_LENGTH);
 789
 790         /* the last tx packet may be incomplete, so flush the fifo.
 791          * FIXME correct req.actual if we can
 792          */
 793         if (ep->bEndpointAddress & USB_DIR_IN)
 794                 *ep->reg_udccs = UDCCS_BI_FTF;
 795 }
 796
 797 /* dma channel stopped ... normal tx end (IN), or on error (IN/OUT) */
 798 static void dma_nodesc_handler(int dmach, void *_ep, struct pt_regs *r)
 799 {
 800         struct pxa2xx_ep        *ep = _ep;
 801         struct pxa2xx_request   *req;
 802         u32                     tmp, completed;
 803
 804         local_irq_disable();
 805
 806         req = list_entry(ep->queue.next, struct pxa2xx_request, queue);
 807
 808         ep->dma_irqs++;
 809         ep->dev->stats.irqs++;
 810         HEX_DISPLAY(ep->dev->stats.irqs);
 811
 812         /* ack/clear */
 813         tmp = DCSR(ep->dma);
 814         DCSR(ep->dma) = tmp;
 815         if ((tmp & DCSR_STOPSTATE) == 0
 816                         || (DDADR(ep->dma) & DDADR_STOP) != 0) {
 817                 DBG(DBG_VERBOSE, "%s, dcsr %08x ddadr %08x\n",
 818                         ep->ep.name, DCSR(ep->dma), DDADR(ep->dma));
 819                 goto done;
 820         }
 821         DCSR(ep->dma) = 0;      /* clear DCSR_STOPSTATE */
 822
 823         /* update transfer status */
 824         completed = tmp & DCSR_BUSERR;
 825         if (ep->bEndpointAddress & USB_DIR_IN)
 826                 tmp = DSADR(ep->dma);
 827         else
 828                 tmp = DTADR(ep->dma);
 829         req->req.actual = tmp - req->req.dma;
 830
 831         /* FIXME seems we sometimes see partial transfers... */
 832
 833         if (unlikely(completed != 0))
 834                 req->req.status = -EIO;
 835         else if (req->req.actual) {
 836                 /* these registers have zeroes in low bits; they miscount
 837                  * some (end-of-transfer) short packets:  tx 14 as tx 12
 838                  */
 839                 if (ep->dma_fixup)
 840                         req->req.actual = min(req->req.actual + 3,
 841                                                 req->req.length);
 842
 843                 tmp = (req->req.length - req->req.actual);
 844                 completed = (tmp == 0);
 845                 if (completed && (ep->bEndpointAddress & USB_DIR_IN)) {
 846
 847                         /* maybe validate final short packet ... */
 848                         if ((req->req.actual % ep->ep.maxpacket) != 0)
 849                                 *ep->reg_udccs = UDCCS_BI_TSP/*|UDCCS_BI_TPC*/;
 850
 851                         /* ... or zlp, using pio fallback */
 852                         else if (ep->bmAttributes == USB_ENDPOINT_XFER_BULK
 853                                         && req->req.zero) {
 854                                 DMSG("%s zlp terminate ...\n", ep->ep.name);
 855                                 completed = 0;
 856                         }
 857                 }
 858         }
 859
 860         if (likely(completed)) {
 861                 done(ep, req, 0);
 862
 863                 /* maybe re-activate after completion */
 864                 if (ep->stopped || list_empty(&ep->queue))
 865                         goto done;
 866                 req = list_entry(ep->queue.next, struct pxa2xx_request, queue);
 867         }
 868         kick_dma(ep, req);
 869 done:
 870         local_irq_enable();
 871 }
 872
 873 #endif
 874
 875 /*-------------------------------------------------------------------------*/
 876
 877 static int
 878 pxa2xx_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 879 {
 880         struct pxa2xx_request   *req;
 881         struct pxa2xx_ep        *ep;
 882         struct pxa2xx_udc       *dev;
 883         unsigned long           flags;
 884
 885         req = container_of(_req, struct pxa2xx_request, req);
 886         if (unlikely (!_req || !_req->complete || !_req->buf
 887                         || !list_empty(&req->queue))) {
 888                 DMSG("%s, bad params\n", __FUNCTION__);
 889                 return -EINVAL;
 890         }
 891
 892         ep = container_of(_ep, struct pxa2xx_ep, ep);
 893         if (unlikely (!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 894                 DMSG("%s, bad ep\n", __FUNCTION__);
 895                 return -EINVAL;
 896         }
 897
 898         dev = ep->dev;
 899         if (unlikely (!dev->driver
 900                         || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
 901                 DMSG("%s, bogus device state\n", __FUNCTION__);
 902                 return -ESHUTDOWN;
 903         }
 904
 905         /* iso is always one packet per request, that's the only way
 906          * we can report per-packet status.  that also helps with dma.
 907          */
 908         if (unlikely (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
 909                         && req->req.length > le16_to_cpu
 910                                                 (ep->desc->wMaxPacketSize)))
 911                 return -EMSGSIZE;
 912
 913 #ifdef  USE_DMA
 914         // FIXME caller may already have done the dma mapping
 915         if (ep->dma >= 0) {
 916                 _req->dma = dma_map_single(dev->dev,
 917                         _req->buf, _req->length,
 918                         ((ep->bEndpointAddress & USB_DIR_IN) != 0)
 919                                 ? DMA_TO_DEVICE
 920                                 : DMA_FROM_DEVICE);
 921         }
 922 #endif
 923
 924         DBG(DBG_NOISY, "%s queue req %p, len %d buf %p\n",
 925              _ep->name, _req, _req->length, _req->buf);
 926
 927         local_irq_save(flags);
 928
 929         _req->status = -EINPROGRESS;
 930         _req->actual = 0;
 931
 932         /* kickstart this i/o queue? */
 933         if (list_empty(&ep->queue) && !ep->stopped) {
 934                 if (ep->desc == 0 /* ep0 */) {
 935                         unsigned        length = _req->length;
 936
 937                         switch (dev->ep0state) {
 938                         case EP0_IN_DATA_PHASE:
 939                                 dev->stats.write.ops++;
 940                                 if (write_ep0_fifo(ep, req))
 941                                         req = NULL;
 942                                 break;
 943
 944                         case EP0_OUT_DATA_PHASE:
 945                                 dev->stats.read.ops++;
 946                                 /* messy ... */
 947                                 if (dev->req_config) {
 948                                         DBG(DBG_VERBOSE, "ep0 config ack%s\n",
 949                                                 dev->has_cfr ?  "" : " raced");
 950                                         if (dev->has_cfr)
 951                                                 UDCCFR = UDCCFR_AREN|UDCCFR_ACM
 952                                                         |UDCCFR_MB1;
 953                                         done(ep, req, 0);
 954                                         dev->ep0state = EP0_END_XFER;
 955                                         local_irq_restore (flags);
 956                                         return 0;
 957                                 }
 958                                 if (dev->req_pending)
 959                                         ep0start(dev, UDCCS0_IPR, "OUT");
 960                                 if (length == 0 || ((UDCCS0 & UDCCS0_RNE) != 0
 961                                                 && read_ep0_fifo(ep, req))) {
 962                                         ep0_idle(dev);
 963                                         done(ep, req, 0);
 964                                         req = NULL;
 965                                 }
 966                                 break;
 967
 968                         default:
 969                                 DMSG("ep0 i/o, odd state %d\n", dev->ep0state);
 970                                 local_irq_restore (flags);
 971                                 return -EL2HLT;
 972                         }
 973 #ifdef  USE_DMA
 974                 /* either start dma or prime pio pump */
 975                 } else if (ep->dma >= 0) {
 976                         kick_dma(ep, req);
 977 #endif
 978                 /* can the FIFO can satisfy the request immediately? */
 979                 } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
 980                         if ((*ep->reg_udccs & UDCCS_BI_TFS) != 0
 981                                         && write_fifo(ep, req))
 982                                 req = NULL;
 983                 } else if ((*ep->reg_udccs & UDCCS_BO_RFS) != 0
 984                                 && read_fifo(ep, req)) {
 985                         req = NULL;
 986                 }
 987
 988                 if (likely (req && ep->desc) && ep->dma < 0)
 989                         pio_irq_enable(ep->bEndpointAddress);
 990         }
 991
 992         /* pio or dma irq handler advances the queue. */
 993         if (likely (req != 0))
 994                 list_add_tail(&req->queue, &ep->queue);
 995         local_irq_restore(flags);
 996
 997         return 0;
 998 }
 999
1000
1001 /*
1002  *      nuke - dequeue ALL requests
1003  */
1004 static void nuke(struct pxa2xx_ep *ep, int status)
1005 {
1006         struct pxa2xx_request *req;
1007
1008         /* called with irqs blocked */
1009 #ifdef  USE_DMA
1010         if (ep->dma >= 0 && !ep->stopped)
1011                 cancel_dma(ep);
1012 #endif
1013         while (!list_empty(&ep->queue)) {
1014                 req = list_entry(ep->queue.next,
1015                                 struct pxa2xx_request,
1016                                 queue);
1017                 done(ep, req, status);
1018         }
1019         if (ep->desc)
1020                 pio_irq_disable (ep->bEndpointAddress);
1021 }
1022
1023
1024 /* dequeue JUST ONE request */
1025 static int pxa2xx_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1026 {
1027         struct pxa2xx_ep        *ep;
1028         struct pxa2xx_request   *req;
1029         unsigned long           flags;
1030
1031         ep = container_of(_ep, struct pxa2xx_ep, ep);
1032         if (!_ep || ep->ep.name == ep0name)
1033                 return -EINVAL;
1034
1035         local_irq_save(flags);
1036
1037         /* make sure it's actually queued on this endpoint */
1038         list_for_each_entry (req, &ep->queue, queue) {
1039                 if (&req->req == _req)
1040                         break;
1041         }
1042         if (&req->req != _req) {
1043                 local_irq_restore(flags);
1044                 return -EINVAL;
1045         }
1046
1047 #ifdef  USE_DMA
1048         if (ep->dma >= 0 && ep->queue.next == &req->queue && !ep->stopped) {
1049                 cancel_dma(ep);
1050                 done(ep, req, -ECONNRESET);
1051                 /* restart i/o */
1052                 if (!list_empty(&ep->queue)) {
1053                         req = list_entry(ep->queue.next,
1054                                         struct pxa2xx_request, queue);
1055                         kick_dma(ep, req);
1056                 }
1057         } else
1058 #endif
1059                 done(ep, req, -ECONNRESET);
1060
1061         local_irq_restore(flags);
1062         return 0;
1063 }
1064
1065 /*-------------------------------------------------------------------------*/
1066
1067 static int pxa2xx_ep_set_halt(struct usb_ep *_ep, int value)
1068 {
1069         struct pxa2xx_ep        *ep;
1070         unsigned long           flags;
1071
1072         ep = container_of(_ep, struct pxa2xx_ep, ep);
1073         if (unlikely (!_ep
1074                         || (!ep->desc && ep->ep.name != ep0name))
1075                         || ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
1076                 DMSG("%s, bad ep\n", __FUNCTION__);
1077                 return -EINVAL;
1078         }
1079         if (value == 0) {
1080                 /* this path (reset toggle+halt) is needed to implement
1081                  * SET_INTERFACE on normal hardware.  but it can't be
1082                  * done from software on the PXA UDC, and the hardware
1083                  * forgets to do it as part of SET_INTERFACE automagic.
1084                  */
1085                 DMSG("only host can clear %s halt\n", _ep->name);
1086                 return -EROFS;
1087         }
1088
1089         local_irq_save(flags);
1090
1091         if ((ep->bEndpointAddress & USB_DIR_IN) != 0
1092                         && ((*ep->reg_udccs & UDCCS_BI_TFS) == 0
1093                            || !list_empty(&ep->queue))) {
1094                 local_irq_restore(flags);
1095                 return -EAGAIN;
1096         }
1097
1098         /* FST bit is the same for control, bulk in, bulk out, interrupt in */
1099         *ep->reg_udccs = UDCCS_BI_FST|UDCCS_BI_FTF;
1100
1101         /* ep0 needs special care */
1102         if (!ep->desc) {
1103                 start_watchdog(ep->dev);
1104                 ep->dev->req_pending = 0;
1105                 ep->dev->ep0state = EP0_STALL;
1106
1107         /* and bulk/intr endpoints like dropping stalls too */
1108         } else {
1109                 unsigned i;
1110                 for (i = 0; i < 1000; i += 20) {
1111                         if (*ep->reg_udccs & UDCCS_BI_SST)
1112                                 break;
1113                         udelay(20);
1114                 }
1115         }
1116         local_irq_restore(flags);
1117
1118         DBG(DBG_VERBOSE, "%s halt\n", _ep->name);
1119         return 0;
1120 }
1121
1122 static int pxa2xx_ep_fifo_status(struct usb_ep *_ep)
1123 {
1124         struct pxa2xx_ep        *ep;
1125
1126         ep = container_of(_ep, struct pxa2xx_ep, ep);
1127         if (!_ep) {
1128                 DMSG("%s, bad ep\n", __FUNCTION__);
1129                 return -ENODEV;
1130         }
1131         /* pxa can't report unclaimed bytes from IN fifos */
1132         if ((ep->bEndpointAddress & USB_DIR_IN) != 0)
1133                 return -EOPNOTSUPP;
1134         if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN
1135                         || (*ep->reg_udccs & UDCCS_BO_RFS) == 0)
1136                 return 0;
1137         else
1138                 return (*ep->reg_ubcr & 0xfff) + 1;
1139 }
1140
1141 static void pxa2xx_ep_fifo_flush(struct usb_ep *_ep)
1142 {
1143         struct pxa2xx_ep        *ep;
1144
1145         ep = container_of(_ep, struct pxa2xx_ep, ep);
1146         if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) {
1147                 DMSG("%s, bad ep\n", __FUNCTION__);
1148                 return;
1149         }
1150
1151         /* toggle and halt bits stay unchanged */
1152
1153         /* for OUT, just read and discard the FIFO contents. */
1154         if ((ep->bEndpointAddress & USB_DIR_IN) == 0) {
1155                 while (((*ep->reg_udccs) & UDCCS_BO_RNE) != 0)
1156                         (void) *ep->reg_uddr;
1157                 return;
1158         }
1159
1160         /* most IN status is the same, but ISO can't stall */
1161         *ep->reg_udccs = UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR
1162                 | (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
1163                         ? 0 : UDCCS_BI_SST;
1164 }
1165
1166
1167 static struct usb_ep_ops pxa2xx_ep_ops = {
1168         .enable         = pxa2xx_ep_enable,
1169         .disable        = pxa2xx_ep_disable,
1170
1171         .alloc_request  = pxa2xx_ep_alloc_request,
1172         .free_request   = pxa2xx_ep_free_request,
1173
1174         .alloc_buffer   = pxa2xx_ep_alloc_buffer,
1175         .free_buffer    = pxa2xx_ep_free_buffer,
1176
1177         .queue          = pxa2xx_ep_queue,
1178         .dequeue        = pxa2xx_ep_dequeue,
1179
1180         .set_halt       = pxa2xx_ep_set_halt,
1181         .fifo_status    = pxa2xx_ep_fifo_status,
1182         .fifo_flush     = pxa2xx_ep_fifo_flush,
1183 };
1184
1185
1186 /* ---------------------------------------------------------------------------
1187  *      device-scoped parts of the api to the usb controller hardware
1188  * ---------------------------------------------------------------------------
1189  */
1190
1191 static int pxa2xx_udc_get_frame(struct usb_gadget *_gadget)
1192 {
1193         return ((UFNRH & 0x07) << 8) | (UFNRL & 0xff);
1194 }
1195
1196 static int pxa2xx_udc_wakeup(struct usb_gadget *_gadget)
1197 {
1198         /* host may not have enabled remote wakeup */
1199         if ((UDCCS0 & UDCCS0_DRWF) == 0)
1200                 return -EHOSTUNREACH;
1201         udc_set_mask_UDCCR(UDCCR_RSM);
1202         return 0;
1203 }
1204
1205 static void stop_activity(struct pxa2xx_udc *, struct usb_gadget_driver *);
1206 static void udc_enable (struct pxa2xx_udc *);
1207 static void udc_disable(struct pxa2xx_udc *);
1208
1209 /* We disable the UDC -- and its 48 MHz clock -- whenever it's not
1210  * in active use.
1211  */
1212 static int pullup(struct pxa2xx_udc *udc, int is_active)
1213 {
1214         is_active = is_active && udc->vbus && udc->pullup;
1215         DMSG("%s\n", is_active ? "active" : "inactive");
1216         if (is_active)
1217                 udc_enable(udc);
1218         else {
1219                 if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
1220                         DMSG("disconnect %s\n", udc->driver
1221                                 ? udc->driver->driver.name
1222                                 : "(no driver)");
1223                         stop_activity(udc, udc->driver);
1224                 }
1225                 udc_disable(udc);
1226         }
1227         return 0;
1228 }
1229
1230 /* VBUS reporting logically comes from a transceiver */
1231 static int pxa2xx_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1232 {
1233         struct pxa2xx_udc       *udc;
1234
1235         udc = container_of(_gadget, struct pxa2xx_udc, gadget);
1236         udc->vbus = is_active = (is_active != 0);
1237         DMSG("vbus %s\n", is_active ? "supplied" : "inactive");
1238         pullup(udc, is_active);
1239         return 0;
1240 }
1241
1242 /* drivers may have software control over D+ pullup */
1243 static int pxa2xx_udc_pullup(struct usb_gadget *_gadget, int is_active)
1244 {
1245         struct pxa2xx_udc       *udc;
1246
1247         udc = container_of(_gadget, struct pxa2xx_udc, gadget);
1248
1249         /* not all boards support pullup control */
1250         if (!udc->mach->udc_command)
1251                 return -EOPNOTSUPP;
1252
1253         is_active = (is_active != 0);
1254         udc->pullup = is_active;
1255         pullup(udc, is_active);
1256         return 0;
1257 }
1258
1259 static const struct usb_gadget_ops pxa2xx_udc_ops = {
1260         .get_frame      = pxa2xx_udc_get_frame,
1261         .wakeup         = pxa2xx_udc_wakeup,
1262         .vbus_session   = pxa2xx_udc_vbus_session,
1263         .pullup         = pxa2xx_udc_pullup,
1264
1265         // .vbus_draw ... boards may consume current from VBUS, up to
1266         // 100-500mA based on config.  the 500uA suspend ceiling means
1267         // that exclusively vbus-powered PXA designs violate USB specs.
1268 };
1269
1270 /*-------------------------------------------------------------------------*/
1271
1272 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1273
1274 static const char proc_node_name [] = "driver/udc";
1275
1276 static int
1277 udc_proc_read(char *page, char **start, off_t off, int count,
1278                 int *eof, void *_dev)
1279 {
1280         char                    *buf = page;
1281         struct pxa2xx_udc       *dev = _dev;
1282         char                    *next = buf;
1283         unsigned                size = count;
1284         unsigned long           flags;
1285         int                     i, t;
1286         u32                     tmp;
1287
1288         if (off != 0)
1289                 return 0;
1290
1291         local_irq_save(flags);
1292
1293         /* basic device status */
1294         t = scnprintf(next, size, DRIVER_DESC "\n"
1295                 "%s version: %s\nGadget driver: %s\nHost %s\n\n",
1296                 driver_name, DRIVER_VERSION SIZE_STR DMASTR,
1297                 dev->driver ? dev->driver->driver.name : "(none)",
1298                 is_vbus_present() ? "full speed" : "disconnected");
1299         size -= t;
1300         next += t;
1301
1302         /* registers for device and ep0 */
1303         t = scnprintf(next, size,
1304                 "uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
1305                 UICR1, UICR0, USIR1, USIR0, UFNRH, UFNRL);
1306         size -= t;
1307         next += t;
1308
1309         tmp = UDCCR;
1310         t = scnprintf(next, size,
1311                 "udccr %02X =%s%s%s%s%s%s%s%s\n", tmp,
1312                 (tmp & UDCCR_REM) ? " rem" : "",
1313                 (tmp & UDCCR_RSTIR) ? " rstir" : "",
1314                 (tmp & UDCCR_SRM) ? " srm" : "",
1315                 (tmp & UDCCR_SUSIR) ? " susir" : "",
1316                 (tmp & UDCCR_RESIR) ? " resir" : "",
1317                 (tmp & UDCCR_RSM) ? " rsm" : "",
1318                 (tmp & UDCCR_UDA) ? " uda" : "",
1319                 (tmp & UDCCR_UDE) ? " ude" : "");
1320         size -= t;
1321         next += t;
1322
1323         tmp = UDCCS0;
1324         t = scnprintf(next, size,
1325                 "udccs0 %02X =%s%s%s%s%s%s%s%s\n", tmp,
1326                 (tmp & UDCCS0_SA) ? " sa" : "",
1327                 (tmp & UDCCS0_RNE) ? " rne" : "",
1328                 (tmp & UDCCS0_FST) ? " fst" : "",
1329                 (tmp & UDCCS0_SST) ? " sst" : "",
1330                 (tmp & UDCCS0_DRWF) ? " dwrf" : "",
1331                 (tmp & UDCCS0_FTF) ? " ftf" : "",
1332                 (tmp & UDCCS0_IPR) ? " ipr" : "",
1333                 (tmp & UDCCS0_OPR) ? " opr" : "");
1334         size -= t;
1335         next += t;
1336
1337         if (dev->has_cfr) {
1338                 tmp = UDCCFR;
1339                 t = scnprintf(next, size,
1340                         "udccfr %02X =%s%s\n", tmp,
1341                         (tmp & UDCCFR_AREN) ? " aren" : "",
1342                         (tmp & UDCCFR_ACM) ? " acm" : "");
1343                 size -= t;
1344                 next += t;
1345         }
1346
1347         if (!is_vbus_present() || !dev->driver)
1348                 goto done;
1349
1350         t = scnprintf(next, size, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n",
1351                 dev->stats.write.bytes, dev->stats.write.ops,
1352                 dev->stats.read.bytes, dev->stats.read.ops,
1353                 dev->stats.irqs);
1354         size -= t;
1355         next += t;
1356
1357         /* dump endpoint queues */
1358         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1359                 struct pxa2xx_ep        *ep = &dev->ep [i];
1360                 struct pxa2xx_request   *req;
1361                 int                     t;
1362
1363                 if (i != 0) {
1364                         const struct usb_endpoint_descriptor    *d;
1365
1366                         d = ep->desc;
1367                         if (!d)
1368                                 continue;
1369                         tmp = *dev->ep [i].reg_udccs;
1370                         t = scnprintf(next, size,
1371                                 "%s max %d %s udccs %02x irqs %lu/%lu\n",
1372                                 ep->ep.name, le16_to_cpu (d->wMaxPacketSize),
1373                                 (ep->dma >= 0) ? "dma" : "pio", tmp,
1374                                 ep->pio_irqs, ep->dma_irqs);
1375                         /* TODO translate all five groups of udccs bits! */
1376
1377                 } else /* ep0 should only have one transfer queued */
1378                         t = scnprintf(next, size, "ep0 max 16 pio irqs %lu\n",
1379                                 ep->pio_irqs);
1380                 if (t <= 0 || t > size)
1381                         goto done;
1382                 size -= t;
1383                 next += t;
1384
1385                 if (list_empty(&ep->queue)) {
1386                         t = scnprintf(next, size, "\t(nothing queued)\n");
1387                         if (t <= 0 || t > size)
1388                                 goto done;
1389                         size -= t;
1390                         next += t;
1391                         continue;
1392                 }
1393                 list_for_each_entry(req, &ep->queue, queue) {
1394 #ifdef  USE_DMA
1395                         if (ep->dma >= 0 && req->queue.prev == &ep->queue)
1396                                 t = scnprintf(next, size,
1397                                         "\treq %p len %d/%d "
1398                                         "buf %p (dma%d dcmd %08x)\n",
1399                                         &req->req, req->req.actual,
1400                                         req->req.length, req->req.buf,
1401                                         ep->dma, DCMD(ep->dma)
1402                                         // low 13 bits == bytes-to-go
1403                                         );
1404                         else
1405 #endif
1406                                 t = scnprintf(next, size,
1407                                         "\treq %p len %d/%d buf %p\n",
1408                                         &req->req, req->req.actual,
1409                                         req->req.length, req->req.buf);
1410                         if (t <= 0 || t > size)
1411                                 goto done;
1412                         size -= t;
1413                         next += t;
1414                 }
1415         }
1416
1417 done:
1418         local_irq_restore(flags);
1419         *eof = 1;
1420         return count - size;
1421 }
1422
1423 #define create_proc_files() \
1424         create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev)
1425 #define remove_proc_files() \
1426         remove_proc_entry(proc_node_name, NULL)
1427
1428 #else   /* !CONFIG_USB_GADGET_DEBUG_FILES */
1429
1430 #define create_proc_files() do {} while (0)
1431 #define remove_proc_files() do {} while (0)
1432
1433 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1434
1435 /* "function" sysfs attribute */
1436 static ssize_t
1437 show_function (struct device *_dev, struct device_attribute *attr, char *buf)
1438 {
1439         struct pxa2xx_udc       *dev = dev_get_drvdata (_dev);
1440
1441         if (!dev->driver
1442                         || !dev->driver->function
1443                         || strlen (dev->driver->function) > PAGE_SIZE)
1444                 return 0;
1445         return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function);
1446 }
1447 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
1448
1449 /*-------------------------------------------------------------------------*/
1450
1451 /*
1452  *      udc_disable - disable USB device controller
1453  */
1454 static void udc_disable(struct pxa2xx_udc *dev)
1455 {
1456         /* block all irqs */
1457         udc_set_mask_UDCCR(UDCCR_SRM|UDCCR_REM);
1458         UICR0 = UICR1 = 0xff;
1459         UFNRH = UFNRH_SIM;
1460
1461         /* if hardware supports it, disconnect from usb */
1462         pullup_off();
1463
1464         udc_clear_mask_UDCCR(UDCCR_UDE);
1465
1466 #ifdef  CONFIG_ARCH_PXA
1467         /* Disable clock for USB device */
1468         pxa_set_cken(CKEN11_USB, 0);
1469 #endif
1470
1471         ep0_idle (dev);
1472         dev->gadget.speed = USB_SPEED_UNKNOWN;
1473         LED_CONNECTED_OFF;
1474 }
1475
1476
1477 /*
1478  *      udc_reinit - initialize software state
1479  */
1480 static void udc_reinit(struct pxa2xx_udc *dev)
1481 {
1482         u32     i;
1483
1484         /* device/ep0 records init */
1485         INIT_LIST_HEAD (&dev->gadget.ep_list);
1486         INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1487         dev->ep0state = EP0_IDLE;
1488
1489         /* basic endpoint records init */
1490         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1491                 struct pxa2xx_ep *ep = &dev->ep[i];
1492
1493                 if (i != 0)
1494                         list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1495
1496                 ep->desc = NULL;
1497                 ep->stopped = 0;
1498                 INIT_LIST_HEAD (&ep->queue);
1499                 ep->pio_irqs = ep->dma_irqs = 0;
1500         }
1501
1502         /* the rest was statically initialized, and is read-only */
1503 }
1504
1505 /* until it's enabled, this UDC should be completely invisible
1506  * to any USB host.
1507  */
1508 static void udc_enable (struct pxa2xx_udc *dev)
1509 {
1510         udc_clear_mask_UDCCR(UDCCR_UDE);
1511
1512 #ifdef  CONFIG_ARCH_PXA
1513         /* Enable clock for USB device */
1514         pxa_set_cken(CKEN11_USB, 1);
1515         udelay(5);
1516 #endif
1517
1518         /* try to clear these bits before we enable the udc */
1519         udc_ack_int_UDCCR(UDCCR_SUSIR|/*UDCCR_RSTIR|*/UDCCR_RESIR);
1520
1521         ep0_idle(dev);
1522         dev->gadget.speed = USB_SPEED_UNKNOWN;
1523         dev->stats.irqs = 0;
1524
1525         /*
1526          * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual:
1527          * - enable UDC
1528          * - if RESET is already in progress, ack interrupt
1529          * - unmask reset interrupt
1530          */
1531         udc_set_mask_UDCCR(UDCCR_UDE);
1532         if (!(UDCCR & UDCCR_UDA))
1533                 udc_ack_int_UDCCR(UDCCR_RSTIR);
1534
1535         if (dev->has_cfr /* UDC_RES2 is defined */) {
1536                 /* pxa255 (a0+) can avoid a set_config race that could
1537                  * prevent gadget drivers from configuring correctly
1538                  */
1539                 UDCCFR = UDCCFR_ACM | UDCCFR_MB1;
1540         } else {
1541                 /* "USB test mode" for pxa250 errata 40-42 (stepping a0, a1)
1542                  * which could result in missing packets and interrupts.
1543                  * supposedly one bit per endpoint, controlling whether it
1544                  * double buffers or not; ACM/AREN bits fit into the holes.
1545                  * zero bits (like USIR0_IRx) disable double buffering.
1546                  */
1547                 UDC_RES1 = 0x00;
1548                 UDC_RES2 = 0x00;
1549         }
1550
1551 #ifdef  DISABLE_TEST_MODE
1552         /* "test mode" seems to have become the default in later chip
1553          * revs, preventing double buffering (and invalidating docs).
1554          * this EXPERIMENT enables it for bulk endpoints by tweaking
1555          * undefined/reserved register bits (that other drivers clear).
1556          * Belcarra code comments noted this usage.
1557          */
1558         if (fifo_mode & 1) {    /* IN endpoints */
1559                 UDC_RES1 |= USIR0_IR1|USIR0_IR6;
1560                 UDC_RES2 |= USIR1_IR11;
1561         }
1562         if (fifo_mode & 2) {    /* OUT endpoints */
1563                 UDC_RES1 |= USIR0_IR2|USIR0_IR7;
1564                 UDC_RES2 |= USIR1_IR12;
1565         }
1566 #endif
1567
1568         /* enable suspend/resume and reset irqs */
1569         udc_clear_mask_UDCCR(UDCCR_SRM | UDCCR_REM);
1570
1571         /* enable ep0 irqs */
1572         UICR0 &= ~UICR0_IM0;
1573
1574         /* if hardware supports it, pullup D+ and wait for reset */
1575         pullup_on();
1576 }
1577
1578
1579 /* when a driver is successfully registered, it will receive
1580  * control requests including set_configuration(), which enables
1581  * non-control requests.  then usb traffic follows until a
1582  * disconnect is reported.  then a host may connect again, or
1583  * the driver might get unbound.
1584  */
1585 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1586 {
1587         struct pxa2xx_udc       *dev = the_controller;
1588         int                     retval;
1589
1590         if (!driver
1591                         || driver->speed < USB_SPEED_FULL
1592                         || !driver->bind
1593                         || !driver->unbind
1594                         || !driver->disconnect
1595                         || !driver->setup)
1596                 return -EINVAL;
1597         if (!dev)
1598                 return -ENODEV;
1599         if (dev->driver)
1600                 return -EBUSY;
1601
1602         /* first hook up the driver ... */
1603         dev->driver = driver;
1604         dev->gadget.dev.driver = &driver->driver;
1605         dev->pullup = 1;
1606
1607         device_add (&dev->gadget.dev);
1608         retval = driver->bind(&dev->gadget);
1609         if (retval) {
1610                 DMSG("bind to driver %s --> error %d\n",
1611                                 driver->driver.name, retval);
1612                 device_del (&dev->gadget.dev);
1613
1614                 dev->driver = NULL;
1615                 dev->gadget.dev.driver = NULL;
1616                 return retval;
1617         }
1618         device_create_file(dev->dev, &dev_attr_function);
1619
1620         /* ... then enable host detection and ep0; and we're ready
1621          * for set_configuration as well as eventual disconnect.
1622          */
1623         DMSG("registered gadget driver '%s'\n", driver->driver.name);
1624         pullup(dev, 1);
1625         dump_state(dev);
1626         return 0;
1627 }
1628 EXPORT_SYMBOL(usb_gadget_register_driver);
1629
1630 static void
1631 stop_activity(struct pxa2xx_udc *dev, struct usb_gadget_driver *driver)
1632 {
1633         int i;
1634
1635         /* don't disconnect drivers more than once */
1636         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1637                 driver = NULL;
1638         dev->gadget.speed = USB_SPEED_UNKNOWN;
1639
1640         /* prevent new request submissions, kill any outstanding requests  */
1641         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1642                 struct pxa2xx_ep *ep = &dev->ep[i];
1643
1644                 ep->stopped = 1;
1645                 nuke(ep, -ESHUTDOWN);
1646         }
1647         del_timer_sync(&dev->timer);
1648
1649         /* report disconnect; the driver is already quiesced */
1650         LED_CONNECTED_OFF;
1651         if (driver)
1652                 driver->disconnect(&dev->gadget);
1653
1654         /* re-init driver-visible data structures */
1655         udc_reinit(dev);
1656 }
1657
1658 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1659 {
1660         struct pxa2xx_udc       *dev = the_controller;
1661
1662         if (!dev)
1663                 return -ENODEV;
1664         if (!driver || driver != dev->driver)
1665                 return -EINVAL;
1666
1667         local_irq_disable();
1668         pullup(dev, 0);
1669         stop_activity(dev, driver);
1670         local_irq_enable();
1671
1672         driver->unbind(&dev->gadget);
1673         dev->driver = NULL;
1674
1675         device_del (&dev->gadget.dev);
1676         device_remove_file(dev->dev, &dev_attr_function);
1677
1678         DMSG("unregistered gadget driver '%s'\n", driver->driver.name);
1679         dump_state(dev);
1680         return 0;
1681 }
1682 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1683
1684
1685 /*-------------------------------------------------------------------------*/
1686
1687 #ifdef CONFIG_ARCH_LUBBOCK
1688
1689 /* Lubbock has separate connect and disconnect irqs.  More typical designs
1690  * use one GPIO as the VBUS IRQ, and another to control the D+ pullup.
1691  */
1692
1693 static irqreturn_t
1694 lubbock_vbus_irq(int irq, void *_dev, struct pt_regs *r)
1695 {
1696         struct pxa2xx_udc       *dev = _dev;
1697         int                     vbus;
1698
1699         dev->stats.irqs++;
1700         HEX_DISPLAY(dev->stats.irqs);
1701         switch (irq) {
1702         case LUBBOCK_USB_IRQ:
1703                 LED_CONNECTED_ON;
1704                 vbus = 1;
1705                 disable_irq(LUBBOCK_USB_IRQ);
1706                 enable_irq(LUBBOCK_USB_DISC_IRQ);
1707                 break;
1708         case LUBBOCK_USB_DISC_IRQ:
1709                 LED_CONNECTED_OFF;
1710                 vbus = 0;
1711                 disable_irq(LUBBOCK_USB_DISC_IRQ);
1712                 enable_irq(LUBBOCK_USB_IRQ);
1713                 break;
1714         default:
1715                 return IRQ_NONE;
1716         }
1717
1718         pxa2xx_udc_vbus_session(&dev->gadget, vbus);
1719         return IRQ_HANDLED;
1720 }
1721
1722 #endif
1723
1724
1725 /*-------------------------------------------------------------------------*/
1726
1727 static inline void clear_ep_state (struct pxa2xx_udc *dev)
1728 {
1729         unsigned i;
1730
1731         /* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint
1732          * fifos, and pending transactions mustn't be continued in any case.
1733          */
1734         for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++)
1735                 nuke(&dev->ep[i], -ECONNABORTED);
1736 }
1737
1738 static void udc_watchdog(unsigned long _dev)
1739 {
1740         struct pxa2xx_udc       *dev = (void *)_dev;
1741
1742         local_irq_disable();
1743         if (dev->ep0state == EP0_STALL
1744                         && (UDCCS0 & UDCCS0_FST) == 0
1745                         && (UDCCS0 & UDCCS0_SST) == 0) {
1746                 UDCCS0 = UDCCS0_FST|UDCCS0_FTF;
1747                 DBG(DBG_VERBOSE, "ep0 re-stall\n");
1748                 start_watchdog(dev);
1749         }
1750         local_irq_enable();
1751 }
1752
1753 static void handle_ep0 (struct pxa2xx_udc *dev)
1754 {
1755         u32                     udccs0 = UDCCS0;
1756         struct pxa2xx_ep        *ep = &dev->ep [0];
1757         struct pxa2xx_request   *req;
1758         union {
1759                 struct usb_ctrlrequest  r;
1760                 u8                      raw [8];
1761                 u32                     word [2];
1762         } u;
1763
1764         if (list_empty(&ep->queue))
1765                 req = NULL;
1766         else
1767                 req = list_entry(ep->queue.next, struct pxa2xx_request, queue);
1768
1769         /* clear stall status */
1770         if (udccs0 & UDCCS0_SST) {
1771                 nuke(ep, -EPIPE);
1772                 UDCCS0 = UDCCS0_SST;
1773                 del_timer(&dev->timer);
1774                 ep0_idle(dev);
1775         }
1776
1777         /* previous request unfinished?  non-error iff back-to-back ... */
1778         if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) {
1779                 nuke(ep, 0);
1780                 del_timer(&dev->timer);
1781                 ep0_idle(dev);
1782         }
1783
1784         switch (dev->ep0state) {
1785         case EP0_IDLE:
1786                 /* late-breaking status? */
1787                 udccs0 = UDCCS0;
1788
1789                 /* start control request? */
1790                 if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))
1791                                 == (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) {
1792                         int i;
1793
1794                         nuke (ep, -EPROTO);
1795
1796                         /* read SETUP packet */
1797                         for (i = 0; i < 8; i++) {
1798                                 if (unlikely(!(UDCCS0 & UDCCS0_RNE))) {
1799 bad_setup:
1800                                         DMSG("SETUP %d!\n", i);
1801                                         goto stall;
1802                                 }
1803                                 u.raw [i] = (u8) UDDR0;
1804                         }
1805                         if (unlikely((UDCCS0 & UDCCS0_RNE) != 0))
1806                                 goto bad_setup;
1807
1808 got_setup:
1809                         DBG(DBG_VERBOSE, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1810                                 u.r.bRequestType, u.r.bRequest,
1811                                 le16_to_cpu(u.r.wValue),
1812                                 le16_to_cpu(u.r.wIndex),
1813                                 le16_to_cpu(u.r.wLength));
1814
1815                         /* cope with automagic for some standard requests. */
1816                         dev->req_std = (u.r.bRequestType & USB_TYPE_MASK)
1817                                                 == USB_TYPE_STANDARD;
1818                         dev->req_config = 0;
1819                         dev->req_pending = 1;
1820                         switch (u.r.bRequest) {
1821                         /* hardware restricts gadget drivers here! */
1822                         case USB_REQ_SET_CONFIGURATION:
1823                                 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1824                                         /* reflect hardware's automagic
1825                                          * up to the gadget driver.
1826                                          */
1827 config_change:
1828                                         dev->req_config = 1;
1829                                         clear_ep_state(dev);
1830                                         /* if !has_cfr, there's no synch
1831                                          * else use AREN (later) not SA|OPR
1832                                          * USIR0_IR0 acts edge sensitive
1833                                          */
1834                                 }
1835                                 break;
1836                         /* ... and here, even more ... */
1837                         case USB_REQ_SET_INTERFACE:
1838                                 if (u.r.bRequestType == USB_RECIP_INTERFACE) {
1839                                         /* udc hardware is broken by design:
1840                                          *  - altsetting may only be zero;
1841                                          *  - hw resets all interfaces' eps;
1842                                          *  - ep reset doesn't include halt(?).
1843                                          */
1844                                         DMSG("broken set_interface (%d/%d)\n",
1845                                                 le16_to_cpu(u.r.wIndex),
1846                                                 le16_to_cpu(u.r.wValue));
1847                                         goto config_change;
1848                                 }
1849                                 break;
1850                         /* hardware was supposed to hide this */
1851                         case USB_REQ_SET_ADDRESS:
1852                                 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1853                                         ep0start(dev, 0, "address");
1854                                         return;
1855                                 }
1856                                 break;
1857                         }
1858
1859                         if (u.r.bRequestType & USB_DIR_IN)
1860                                 dev->ep0state = EP0_IN_DATA_PHASE;
1861                         else
1862                                 dev->ep0state = EP0_OUT_DATA_PHASE;
1863
1864                         i = dev->driver->setup(&dev->gadget, &u.r);
1865                         if (i < 0) {
1866                                 /* hardware automagic preventing STALL... */
1867                                 if (dev->req_config) {
1868                                         /* hardware sometimes neglects to tell
1869                                          * tell us about config change events,
1870                                          * so later ones may fail...
1871                                          */
1872                                         WARN("config change %02x fail %d?\n",
1873                                                 u.r.bRequest, i);
1874                                         return;
1875                                         /* TODO experiment:  if has_cfr,
1876                                          * hardware didn't ACK; maybe we
1877                                          * could actually STALL!
1878                                          */
1879                                 }
1880                                 DBG(DBG_VERBOSE, "protocol STALL, "
1881                                         "%02x err %d\n", UDCCS0, i);
1882 stall:
1883                                 /* the watchdog timer helps deal with cases
1884                                  * where udc seems to clear FST wrongly, and
1885                                  * then NAKs instead of STALLing.
1886                                  */
1887                                 ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall");
1888                                 start_watchdog(dev);
1889                                 dev->ep0state = EP0_STALL;
1890
1891                         /* deferred i/o == no response yet */
1892                         } else if (dev->req_pending) {
1893                                 if (likely(dev->ep0state == EP0_IN_DATA_PHASE
1894                                                 || dev->req_std || u.r.wLength))
1895                                         ep0start(dev, 0, "defer");
1896                                 else
1897                                         ep0start(dev, UDCCS0_IPR, "defer/IPR");
1898                         }
1899
1900                         /* expect at least one data or status stage irq */
1901                         return;
1902
1903                 } else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA))
1904                                 == (UDCCS0_OPR|UDCCS0_SA))) {
1905                         unsigned i;
1906
1907                         /* pxa210/250 erratum 131 for B0/B1 says RNE lies.
1908                          * still observed on a pxa255 a0.
1909                          */
1910                         DBG(DBG_VERBOSE, "e131\n");
1911                         nuke(ep, -EPROTO);
1912
1913                         /* read SETUP data, but don't trust it too much */
1914                         for (i = 0; i < 8; i++)
1915                                 u.raw [i] = (u8) UDDR0;
1916                         if ((u.r.bRequestType & USB_RECIP_MASK)
1917                                         > USB_RECIP_OTHER)
1918                                 goto stall;
1919                         if (u.word [0] == 0 && u.word [1] == 0)
1920                                 goto stall;
1921                         goto got_setup;
1922                 } else {
1923                         /* some random early IRQ:
1924                          * - we acked FST
1925                          * - IPR cleared
1926                          * - OPR got set, without SA (likely status stage)
1927                          */
1928                         UDCCS0 = udccs0 & (UDCCS0_SA|UDCCS0_OPR);
1929                 }
1930                 break;
1931         case EP0_IN_DATA_PHASE:                 /* GET_DESCRIPTOR etc */
1932                 if (udccs0 & UDCCS0_OPR) {
1933                         UDCCS0 = UDCCS0_OPR|UDCCS0_FTF;
1934                         DBG(DBG_VERBOSE, "ep0in premature status\n");
1935                         if (req)
1936                                 done(ep, req, 0);
1937                         ep0_idle(dev);
1938                 } else /* irq was IPR clearing */ {
1939                         if (req) {
1940                                 /* this IN packet might finish the request */
1941                                 (void) write_ep0_fifo(ep, req);
1942                         } /* else IN token before response was written */
1943                 }
1944                 break;
1945         case EP0_OUT_DATA_PHASE:                /* SET_DESCRIPTOR etc */
1946                 if (udccs0 & UDCCS0_OPR) {
1947                         if (req) {
1948                                 /* this OUT packet might finish the request */
1949                                 if (read_ep0_fifo(ep, req))
1950                                         done(ep, req, 0);
1951                                 /* else more OUT packets expected */
1952                         } /* else OUT token before read was issued */
1953                 } else /* irq was IPR clearing */ {
1954                         DBG(DBG_VERBOSE, "ep0out premature status\n");
1955                         if (req)
1956                                 done(ep, req, 0);
1957                         ep0_idle(dev);
1958                 }
1959                 break;
1960         case EP0_END_XFER:
1961                 if (req)
1962                         done(ep, req, 0);
1963                 /* ack control-IN status (maybe in-zlp was skipped)
1964                  * also appears after some config change events.
1965                  */
1966                 if (udccs0 & UDCCS0_OPR)
1967                         UDCCS0 = UDCCS0_OPR;
1968                 ep0_idle(dev);
1969                 break;
1970         case EP0_STALL:
1971                 UDCCS0 = UDCCS0_FST;
1972                 break;
1973         }
1974         USIR0 = USIR0_IR0;
1975 }
1976
1977 static void handle_ep(struct pxa2xx_ep *ep)
1978 {
1979         struct pxa2xx_request   *req;
1980         int                     is_in = ep->bEndpointAddress & USB_DIR_IN;
1981         int                     completed;
1982         u32                     udccs, tmp;
1983
1984         do {
1985                 completed = 0;
1986                 if (likely (!list_empty(&ep->queue)))
1987                         req = list_entry(ep->queue.next,
1988                                         struct pxa2xx_request, queue);
1989                 else
1990                         req = NULL;
1991
1992                 // TODO check FST handling
1993
1994                 udccs = *ep->reg_udccs;
1995                 if (unlikely(is_in)) {  /* irq from TPC, SST, or (ISO) TUR */
1996                         tmp = UDCCS_BI_TUR;
1997                         if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1998                                 tmp |= UDCCS_BI_SST;
1999                         tmp &= udccs;
2000                         if (likely (tmp))
2001                                 *ep->reg_udccs = tmp;
2002                         if (req && likely ((udccs & UDCCS_BI_TFS) != 0))
2003                                 completed = write_fifo(ep, req);
2004
2005                 } else {        /* irq from RPC (or for ISO, ROF) */
2006                         if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
2007                                 tmp = UDCCS_BO_SST | UDCCS_BO_DME;
2008                         else
2009                                 tmp = UDCCS_IO_ROF | UDCCS_IO_DME;
2010                         tmp &= udccs;
2011                         if (likely(tmp))
2012                                 *ep->reg_udccs = tmp;
2013
2014                         /* fifos can hold packets, ready for reading... */
2015                         if (likely(req)) {
2016 #ifdef USE_OUT_DMA
2017 // TODO didn't yet debug out-dma.  this approach assumes
2018 // the worst about short packets and RPC; it might be better.
2019
2020                                 if (likely(ep->dma >= 0)) {
2021                                         if (!(udccs & UDCCS_BO_RSP)) {
2022                                                 *ep->reg_udccs = UDCCS_BO_RPC;
2023                                                 ep->dma_irqs++;
2024                                                 return;
2025                                         }
2026                                 }
2027 #endif
2028                                 completed = read_fifo(ep, req);
2029                         } else
2030                                 pio_irq_disable (ep->bEndpointAddress);
2031                 }
2032                 ep->pio_irqs++;
2033         } while (completed);
2034 }
2035
2036 /*
2037  *      pxa2xx_udc_irq - interrupt handler
2038  *
2039  * avoid delays in ep0 processing. the control handshaking isn't always
2040  * under software control (pxa250c0 and the pxa255 are better), and delays
2041  * could cause usb protocol errors.
2042  */
2043 static irqreturn_t
2044 pxa2xx_udc_irq(int irq, void *_dev, struct pt_regs *r)
2045 {
2046         struct pxa2xx_udc       *dev = _dev;
2047         int                     handled;
2048
2049         dev->stats.irqs++;
2050         HEX_DISPLAY(dev->stats.irqs);
2051         do {
2052                 u32             udccr = UDCCR;
2053
2054                 handled = 0;
2055
2056                 /* SUSpend Interrupt Request */
2057                 if (unlikely(udccr & UDCCR_SUSIR)) {
2058                         udc_ack_int_UDCCR(UDCCR_SUSIR);
2059                         handled = 1;
2060                         DBG(DBG_VERBOSE, "USB suspend%s\n", is_vbus_present()
2061                                 ? "" : "+disconnect");
2062
2063                         if (!is_vbus_present())
2064                                 stop_activity(dev, dev->driver);
2065                         else if (dev->gadget.speed != USB_SPEED_UNKNOWN
2066                                         && dev->driver
2067                                         && dev->driver->suspend)
2068                                 dev->driver->suspend(&dev->gadget);
2069                         ep0_idle (dev);
2070                 }
2071
2072                 /* RESume Interrupt Request */
2073                 if (unlikely(udccr & UDCCR_RESIR)) {
2074                         udc_ack_int_UDCCR(UDCCR_RESIR);
2075                         handled = 1;
2076                         DBG(DBG_VERBOSE, "USB resume\n");
2077
2078                         if (dev->gadget.speed != USB_SPEED_UNKNOWN
2079                                         && dev->driver
2080                                         && dev->driver->resume
2081                                         && is_vbus_present())
2082                                 dev->driver->resume(&dev->gadget);
2083                 }
2084
2085                 /* ReSeT Interrupt Request - USB reset */
2086                 if (unlikely(udccr & UDCCR_RSTIR)) {
2087                         udc_ack_int_UDCCR(UDCCR_RSTIR);
2088                         handled = 1;
2089
2090                         if ((UDCCR & UDCCR_UDA) == 0) {
2091                                 DBG(DBG_VERBOSE, "USB reset start\n");
2092
2093                                 /* reset driver and endpoints,
2094                                  * in case that's not yet done
2095                                  */
2096                                 stop_activity (dev, dev->driver);
2097
2098                         } else {
2099                                 DBG(DBG_VERBOSE, "USB reset end\n");
2100                                 dev->gadget.speed = USB_SPEED_FULL;
2101                                 LED_CONNECTED_ON;
2102                                 memset(&dev->stats, 0, sizeof dev->stats);
2103                                 /* driver and endpoints are still reset */
2104                         }
2105
2106                 } else {
2107                         u32     usir0 = USIR0 & ~UICR0;
2108                         u32     usir1 = USIR1 & ~UICR1;
2109                         int     i;
2110
2111                         if (unlikely (!usir0 && !usir1))
2112                                 continue;
2113
2114                         DBG(DBG_VERY_NOISY, "irq %02x.%02x\n", usir1, usir0);
2115
2116                         /* control traffic */
2117                         if (usir0 & USIR0_IR0) {
2118                                 dev->ep[0].pio_irqs++;
2119                                 handle_ep0(dev);
2120                                 handled = 1;
2121                         }
2122
2123                         /* endpoint data transfers */
2124                         for (i = 0; i < 8; i++) {
2125                                 u32     tmp = 1 << i;
2126
2127                                 if (i && (usir0 & tmp)) {
2128                                         handle_ep(&dev->ep[i]);
2129                                         USIR0 |= tmp;
2130                                         handled = 1;
2131                                 }
2132                                 if (usir1 & tmp) {
2133                                         handle_ep(&dev->ep[i+8]);
2134                                         USIR1 |= tmp;
2135                                         handled = 1;
2136                                 }
2137                         }
2138                 }
2139
2140                 /* we could also ask for 1 msec SOF (SIR) interrupts */
2141
2142         } while (handled);
2143         return IRQ_HANDLED;
2144 }
2145
2146 /*-------------------------------------------------------------------------*/
2147
2148 static void nop_release (struct device *dev)
2149 {
2150         DMSG("%s %s\n", __FUNCTION__, dev->bus_id);
2151 }
2152
2153 /* this uses load-time allocation and initialization (instead of
2154  * doing it at run-time) to save code, eliminate fault paths, and
2155  * be more obviously correct.
2156  */
2157 static struct pxa2xx_udc memory = {
2158         .gadget = {
2159                 .ops            = &pxa2xx_udc_ops,
2160                 .ep0            = &memory.ep[0].ep,
2161                 .name           = driver_name,
2162                 .dev = {
2163                         .bus_id         = "gadget",
2164                         .release        = nop_release,
2165                 },
2166         },
2167
2168         /* control endpoint */
2169         .ep[0] = {
2170                 .ep = {
2171                         .name           = ep0name,
2172                         .ops            = &pxa2xx_ep_ops,
2173                         .maxpacket      = EP0_FIFO_SIZE,
2174                 },
2175                 .dev            = &memory,
2176                 .reg_udccs      = &UDCCS0,
2177                 .reg_uddr       = &UDDR0,
2178         },
2179
2180         /* first group of endpoints */
2181         .ep[1] = {
2182                 .ep = {
2183                         .name           = "ep1in-bulk",
2184                         .ops            = &pxa2xx_ep_ops,
2185                         .maxpacket      = BULK_FIFO_SIZE,
2186                 },
2187                 .dev            = &memory,
2188                 .fifo_size      = BULK_FIFO_SIZE,
2189                 .bEndpointAddress = USB_DIR_IN | 1,
2190                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2191                 .reg_udccs      = &UDCCS1,
2192                 .reg_uddr       = &UDDR1,
2193                 drcmr (25)
2194         },
2195         .ep[2] = {
2196                 .ep = {
2197                         .name           = "ep2out-bulk",
2198                         .ops            = &pxa2xx_ep_ops,
2199                         .maxpacket      = BULK_FIFO_SIZE,
2200                 },
2201                 .dev            = &memory,
2202                 .fifo_size      = BULK_FIFO_SIZE,
2203                 .bEndpointAddress = 2,
2204                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2205                 .reg_udccs      = &UDCCS2,
2206                 .reg_ubcr       = &UBCR2,
2207                 .reg_uddr       = &UDDR2,
2208                 drcmr (26)
2209         },
2210 #ifndef CONFIG_USB_PXA2XX_SMALL
2211         .ep[3] = {
2212                 .ep = {
2213                         .name           = "ep3in-iso",
2214                         .ops            = &pxa2xx_ep_ops,
2215                         .maxpacket      = ISO_FIFO_SIZE,
2216                 },
2217                 .dev            = &memory,
2218                 .fifo_size      = ISO_FIFO_SIZE,
2219                 .bEndpointAddress = USB_DIR_IN | 3,
2220                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2221                 .reg_udccs      = &UDCCS3,
2222                 .reg_uddr       = &UDDR3,
2223                 drcmr (27)
2224         },
2225         .ep[4] = {
2226                 .ep = {
2227                         .name           = "ep4out-iso",
2228                         .ops            = &pxa2xx_ep_ops,
2229                         .maxpacket      = ISO_FIFO_SIZE,
2230                 },
2231                 .dev            = &memory,
2232                 .fifo_size      = ISO_FIFO_SIZE,
2233                 .bEndpointAddress = 4,
2234                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2235                 .reg_udccs      = &UDCCS4,
2236                 .reg_ubcr       = &UBCR4,
2237                 .reg_uddr       = &UDDR4,
2238                 drcmr (28)
2239         },
2240         .ep[5] = {
2241                 .ep = {
2242                         .name           = "ep5in-int",
2243                         .ops            = &pxa2xx_ep_ops,
2244                         .maxpacket      = INT_FIFO_SIZE,
2245                 },
2246                 .dev            = &memory,
2247                 .fifo_size      = INT_FIFO_SIZE,
2248                 .bEndpointAddress = USB_DIR_IN | 5,
2249                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
2250                 .reg_udccs      = &UDCCS5,
2251                 .reg_uddr       = &UDDR5,
2252         },
2253
2254         /* second group of endpoints */
2255         .ep[6] = {
2256                 .ep = {
2257                         .name           = "ep6in-bulk",
2258                         .ops            = &pxa2xx_ep_ops,
2259                         .maxpacket      = BULK_FIFO_SIZE,
2260                 },
2261                 .dev            = &memory,
2262                 .fifo_size      = BULK_FIFO_SIZE,
2263                 .bEndpointAddress = USB_DIR_IN | 6,
2264                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2265                 .reg_udccs      = &UDCCS6,
2266                 .reg_uddr       = &UDDR6,
2267                 drcmr (30)
2268         },
2269         .ep[7] = {
2270                 .ep = {
2271                         .name           = "ep7out-bulk",
2272                         .ops            = &pxa2xx_ep_ops,
2273                         .maxpacket      = BULK_FIFO_SIZE,
2274                 },
2275                 .dev            = &memory,
2276                 .fifo_size      = BULK_FIFO_SIZE,
2277                 .bEndpointAddress = 7,
2278                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2279                 .reg_udccs      = &UDCCS7,
2280                 .reg_ubcr       = &UBCR7,
2281                 .reg_uddr       = &UDDR7,
2282                 drcmr (31)
2283         },
2284         .ep[8] = {
2285                 .ep = {
2286                         .name           = "ep8in-iso",
2287                         .ops            = &pxa2xx_ep_ops,
2288                         .maxpacket      = ISO_FIFO_SIZE,
2289                 },
2290                 .dev            = &memory,
2291                 .fifo_size      = ISO_FIFO_SIZE,
2292                 .bEndpointAddress = USB_DIR_IN | 8,
2293                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2294                 .reg_udccs      = &UDCCS8,
2295                 .reg_uddr       = &UDDR8,
2296                 drcmr (32)
2297         },
2298         .ep[9] = {
2299                 .ep = {
2300                         .name           = "ep9out-iso",
2301                         .ops            = &pxa2xx_ep_ops,
2302                         .maxpacket      = ISO_FIFO_SIZE,
2303                 },
2304                 .dev            = &memory,
2305                 .fifo_size      = ISO_FIFO_SIZE,
2306                 .bEndpointAddress = 9,
2307                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2308                 .reg_udccs      = &UDCCS9,
2309                 .reg_ubcr       = &UBCR9,
2310                 .reg_uddr       = &UDDR9,
2311                 drcmr (33)
2312         },
2313         .ep[10] = {
2314                 .ep = {
2315                         .name           = "ep10in-int",
2316                         .ops            = &pxa2xx_ep_ops,
2317                         .maxpacket      = INT_FIFO_SIZE,
2318                 },
2319                 .dev            = &memory,
2320                 .fifo_size      = INT_FIFO_SIZE,
2321                 .bEndpointAddress = USB_DIR_IN | 10,
2322                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
2323                 .reg_udccs      = &UDCCS10,
2324                 .reg_uddr       = &UDDR10,
2325         },
2326
2327         /* third group of endpoints */
2328         .ep[11] = {
2329                 .ep = {
2330                         .name           = "ep11in-bulk",
2331                         .ops            = &pxa2xx_ep_ops,
2332                         .maxpacket      = BULK_FIFO_SIZE,
2333                 },
2334                 .dev            = &memory,
2335                 .fifo_size      = BULK_FIFO_SIZE,
2336                 .bEndpointAddress = USB_DIR_IN | 11,
2337                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2338                 .reg_udccs      = &UDCCS11,
2339                 .reg_uddr       = &UDDR11,
2340                 drcmr (35)
2341         },
2342         .ep[12] = {
2343                 .ep = {
2344                         .name           = "ep12out-bulk",
2345                         .ops            = &pxa2xx_ep_ops,
2346                         .maxpacket      = BULK_FIFO_SIZE,
2347                 },
2348                 .dev            = &memory,
2349                 .fifo_size      = BULK_FIFO_SIZE,
2350                 .bEndpointAddress = 12,
2351                 .bmAttributes   = USB_ENDPOINT_XFER_BULK,
2352                 .reg_udccs      = &UDCCS12,
2353                 .reg_ubcr       = &UBCR12,
2354                 .reg_uddr       = &UDDR12,
2355                 drcmr (36)
2356         },
2357         .ep[13] = {
2358                 .ep = {
2359                         .name           = "ep13in-iso",
2360                         .ops            = &pxa2xx_ep_ops,
2361                         .maxpacket      = ISO_FIFO_SIZE,
2362                 },
2363                 .dev            = &memory,
2364                 .fifo_size      = ISO_FIFO_SIZE,
2365                 .bEndpointAddress = USB_DIR_IN | 13,
2366                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2367                 .reg_udccs      = &UDCCS13,
2368                 .reg_uddr       = &UDDR13,
2369                 drcmr (37)
2370         },
2371         .ep[14] = {
2372                 .ep = {
2373                         .name           = "ep14out-iso",
2374                         .ops            = &pxa2xx_ep_ops,
2375                         .maxpacket      = ISO_FIFO_SIZE,
2376                 },
2377                 .dev            = &memory,
2378                 .fifo_size      = ISO_FIFO_SIZE,
2379                 .bEndpointAddress = 14,
2380                 .bmAttributes   = USB_ENDPOINT_XFER_ISOC,
2381                 .reg_udccs      = &UDCCS14,
2382                 .reg_ubcr       = &UBCR14,
2383                 .reg_uddr       = &UDDR14,
2384                 drcmr (38)
2385         },
2386         .ep[15] = {
2387                 .ep = {
2388                         .name           = "ep15in-int",
2389                         .ops            = &pxa2xx_ep_ops,
2390                         .maxpacket      = INT_FIFO_SIZE,
2391                 },
2392                 .dev            = &memory,
2393                 .fifo_size      = INT_FIFO_SIZE,
2394                 .bEndpointAddress = USB_DIR_IN | 15,
2395                 .bmAttributes   = USB_ENDPOINT_XFER_INT,
2396                 .reg_udccs      = &UDCCS15,
2397                 .reg_uddr       = &UDDR15,
2398         },
2399 #endif /* !CONFIG_USB_PXA2XX_SMALL */
2400 };
2401
2402 #define CP15R0_VENDOR_MASK      0xffffe000
2403
2404 #if     defined(CONFIG_ARCH_PXA)
2405 #define CP15R0_XSCALE_VALUE     0x69052000      /* intel/arm/xscale */
2406
2407 #elif   defined(CONFIG_ARCH_IXP4XX)
2408 #define CP15R0_XSCALE_VALUE     0x69054000      /* intel/arm/ixp4xx */
2409
2410 #endif
2411
2412 #define CP15R0_PROD_MASK        0x000003f0
2413 #define PXA25x                  0x00000100      /* and PXA26x */
2414 #define PXA210                  0x00000120
2415
2416 #define CP15R0_REV_MASK         0x0000000f
2417
2418 #define CP15R0_PRODREV_MASK     (CP15R0_PROD_MASK | CP15R0_REV_MASK)
2419
2420 #define PXA255_A0               0x00000106      /* or PXA260_B1 */
2421 #define PXA250_C0               0x00000105      /* or PXA26x_B0 */
2422 #define PXA250_B2               0x00000104
2423 #define PXA250_B1               0x00000103      /* or PXA260_A0 */
2424 #define PXA250_B0               0x00000102
2425 #define PXA250_A1               0x00000101
2426 #define PXA250_A0               0x00000100
2427
2428 #define PXA210_C0               0x00000125
2429 #define PXA210_B2               0x00000124
2430 #define PXA210_B1               0x00000123
2431 #define PXA210_B0               0x00000122
2432 #define IXP425_A0               0x000001c1
2433 #define IXP465_AD               0x00000200
2434
2435 /*
2436  *      probe - binds to the platform device
2437  */
2438 static int __init pxa2xx_udc_probe(struct platform_device *pdev)
2439 {
2440         struct pxa2xx_udc *dev = &memory;
2441         int retval, out_dma = 1;
2442         u32 chiprev;
2443
2444         /* insist on Intel/ARM/XScale */
2445         asm("mrc%? p15, 0, %0, c0, c0" : "=r" (chiprev));
2446         if ((chiprev & CP15R0_VENDOR_MASK) != CP15R0_XSCALE_VALUE) {
2447                 printk(KERN_ERR "%s: not XScale!\n", driver_name);
2448                 return -ENODEV;
2449         }
2450
2451         /* trigger chiprev-specific logic */
2452         switch (chiprev & CP15R0_PRODREV_MASK) {
2453 #if     defined(CONFIG_ARCH_PXA)
2454         case PXA255_A0:
2455                 dev->has_cfr = 1;
2456                 break;
2457         case PXA250_A0:
2458         case PXA250_A1:
2459                 /* A0/A1 "not released"; ep 13, 15 unusable */
2460                 /* fall through */
2461         case PXA250_B2: case PXA210_B2:
2462         case PXA250_B1: case PXA210_B1:
2463         case PXA250_B0: case PXA210_B0:
2464                 out_dma = 0;
2465                 /* fall through */
2466         case PXA250_C0: case PXA210_C0:
2467                 break;
2468 #elif   defined(CONFIG_ARCH_IXP4XX)
2469         case IXP425_A0:
2470         case IXP465_AD:
2471                 dev->has_cfr = 1;
2472                 out_dma = 0;
2473                 break;
2474 #endif
2475         default:
2476                 out_dma = 0;
2477                 printk(KERN_ERR "%s: unrecognized processor: %08x\n",
2478                         driver_name, chiprev);
2479                 /* iop3xx, ixp4xx, ... */
2480                 return -ENODEV;
2481         }
2482
2483         pr_debug("%s: IRQ %d%s%s%s\n", driver_name, IRQ_USB,
2484                 dev->has_cfr ? "" : " (!cfr)",
2485                 out_dma ? "" : " (broken dma-out)",
2486                 SIZE_STR DMASTR
2487                 );
2488
2489 #ifdef  USE_DMA
2490 #ifndef USE_OUT_DMA
2491         out_dma = 0;
2492 #endif
2493         /* pxa 250 erratum 130 prevents using OUT dma (fixed C0) */
2494         if (!out_dma) {
2495                 DMSG("disabled OUT dma\n");
2496                 dev->ep[ 2].reg_drcmr = dev->ep[ 4].reg_drcmr = 0;
2497                 dev->ep[ 7].reg_drcmr = dev->ep[ 9].reg_drcmr = 0;
2498                 dev->ep[12].reg_drcmr = dev->ep[14].reg_drcmr = 0;
2499         }
2500 #endif
2501
2502         /* other non-static parts of init */
2503         dev->dev = &pdev->dev;
2504         dev->mach = pdev->dev.platform_data;
2505
2506         init_timer(&dev->timer);
2507         dev->timer.function = udc_watchdog;
2508         dev->timer.data = (unsigned long) dev;
2509
2510         device_initialize(&dev->gadget.dev);
2511         dev->gadget.dev.parent = &pdev->dev;
2512         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
2513
2514         the_controller = dev;
2515         platform_set_drvdata(pdev, dev);
2516
2517         udc_disable(dev);
2518         udc_reinit(dev);
2519
2520         dev->vbus = is_vbus_present();
2521
2522         /* irq setup after old hardware state is cleaned up */
2523         retval = request_irq(IRQ_USB, pxa2xx_udc_irq,
2524                         IRQF_DISABLED, driver_name, dev);
2525         if (retval != 0) {
2526                 printk(KERN_ERR "%s: can't get irq %i, err %d\n",
2527                         driver_name, IRQ_USB, retval);
2528                 return -EBUSY;
2529         }
2530         dev->got_irq = 1;
2531
2532 #ifdef CONFIG_ARCH_LUBBOCK
2533         if (machine_is_lubbock()) {
2534                 retval = request_irq(LUBBOCK_USB_DISC_IRQ,
2535                                 lubbock_vbus_irq,
2536                                 IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
2537                                 driver_name, dev);
2538                 if (retval != 0) {
2539                         printk(KERN_ERR "%s: can't get irq %i, err %d\n",
2540                                 driver_name, LUBBOCK_USB_DISC_IRQ, retval);
2541 lubbock_fail0:
2542                         free_irq(IRQ_USB, dev);
2543                         return -EBUSY;
2544                 }
2545                 retval = request_irq(LUBBOCK_USB_IRQ,
2546                                 lubbock_vbus_irq,
2547                                 IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
2548                                 driver_name, dev);
2549                 if (retval != 0) {
2550                         printk(KERN_ERR "%s: can't get irq %i, err %d\n",
2551                                 driver_name, LUBBOCK_USB_IRQ, retval);
2552                         free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2553                         goto lubbock_fail0;
2554                 }
2555 #ifdef DEBUG
2556                 /* with U-Boot (but not BLOB), hex is off by default */
2557                 HEX_DISPLAY(dev->stats.irqs);
2558                 LUB_DISC_BLNK_LED &= 0xff;
2559 #endif
2560         }
2561 #endif
2562         create_proc_files();
2563
2564         return 0;
2565 }
2566
2567 static void pxa2xx_udc_shutdown(struct platform_device *_dev)
2568 {
2569         pullup_off();
2570 }
2571
2572 static int __exit pxa2xx_udc_remove(struct platform_device *pdev)
2573 {
2574         struct pxa2xx_udc *dev = platform_get_drvdata(pdev);
2575
2576         udc_disable(dev);
2577         remove_proc_files();
2578         usb_gadget_unregister_driver(dev->driver);
2579
2580         if (dev->got_irq) {
2581                 free_irq(IRQ_USB, dev);
2582                 dev->got_irq = 0;
2583         }
2584 #ifdef CONFIG_ARCH_LUBBOCK
2585         if (machine_is_lubbock()) {
2586                 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2587                 free_irq(LUBBOCK_USB_IRQ, dev);
2588         }
2589 #endif
2590         platform_set_drvdata(pdev, NULL);
2591         the_controller = NULL;
2592         return 0;
2593 }
2594
2595 /*-------------------------------------------------------------------------*/
2596
2597 #ifdef  CONFIG_PM
2598
2599 /* USB suspend (controlled by the host) and system suspend (controlled
2600  * by the PXA) don't necessarily work well together.  If USB is active,
2601  * the 48 MHz clock is required; so the system can't enter 33 MHz idle
2602  * mode, or any deeper PM saving state.
2603  *
2604  * For now, we punt and forcibly disconnect from the USB host when PXA
2605  * enters any suspend state.  While we're disconnected, we always disable
2606  * the 48MHz USB clock ... allowing PXA sleep and/or 33 MHz idle states.
2607  * Boards without software pullup control shouldn't use those states.
2608  * VBUS IRQs should probably be ignored so that the PXA device just acts
2609  * "dead" to USB hosts until system resume.
2610  */
2611 static int pxa2xx_udc_suspend(struct platform_device *dev, pm_message_t state)
2612 {
2613         struct pxa2xx_udc       *udc = platform_get_drvdata(dev);
2614
2615         if (!udc->mach->udc_command)
2616                 WARN("USB host won't detect disconnect!\n");
2617         pullup(udc, 0);
2618
2619         return 0;
2620 }
2621
2622 static int pxa2xx_udc_resume(struct platform_device *dev)
2623 {
2624         struct pxa2xx_udc       *udc = platform_get_drvdata(dev);
2625
2626         pullup(udc, 1);
2627
2628         return 0;
2629 }
2630
2631 #else
2632 #define pxa2xx_udc_suspend      NULL
2633 #define pxa2xx_udc_resume       NULL
2634 #endif
2635
2636 /*-------------------------------------------------------------------------*/
2637
2638 static struct platform_driver udc_driver = {
2639         .probe          = pxa2xx_udc_probe,
2640         .shutdown       = pxa2xx_udc_shutdown,
2641         .remove         = __exit_p(pxa2xx_udc_remove),
2642         .suspend        = pxa2xx_udc_suspend,
2643         .resume         = pxa2xx_udc_resume,
2644         .driver         = {
2645                 .owner  = THIS_MODULE,
2646                 .name   = "pxa2xx-udc",
2647         },
2648 };
2649
2650 static int __init udc_init(void)
2651 {
2652         printk(KERN_INFO "%s: version %s\n", driver_name, DRIVER_VERSION);
2653         return platform_driver_register(&udc_driver);
2654 }
2655 module_init(udc_init);
2656
2657 static void __exit udc_exit(void)
2658 {
2659         platform_driver_unregister(&udc_driver);
2660 }
2661 module_exit(udc_exit);
2662
2663 MODULE_DESCRIPTION(DRIVER_DESC);
2664 MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell");
2665 MODULE_LICENSE("GPL");
2666