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

   1 /*
   2  * omap_udc.c -- for OMAP full speed udc; most chips support OTG.
   3  *
   4  * Copyright (C) 2004 Texas Instruments, Inc.
   5  * Copyright (C) 2004-2005 David Brownell
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #undef  DEBUG
  23 #undef  VERBOSE
  24
  25 #include <linux/config.h>
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28 #include <linux/ioport.h>
  29 #include <linux/types.h>
  30 #include <linux/errno.h>
  31 #include <linux/delay.h>
  32 #include <linux/sched.h>
  33 #include <linux/slab.h>
  34 #include <linux/init.h>
  35 #include <linux/timer.h>
  36 #include <linux/list.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/mm.h>
  40 #include <linux/moduleparam.h>
  41 #include <linux/device.h>
  42 #include <linux/usb_ch9.h>
  43 #include <linux/usb_gadget.h>
  44 #include <linux/usb_otg.h>
  45 #include <linux/dma-mapping.h>
  46
  47 #include <asm/byteorder.h>
  48 #include <asm/io.h>
  49 #include <asm/irq.h>
  50 #include <asm/system.h>
  51 #include <asm/unaligned.h>
  52 #include <asm/mach-types.h>
  53
  54 #include <asm/arch/dma.h>
  55 #include <asm/arch/usb.h>
  56
  57 #include "omap_udc.h"
  58
  59 #undef  USB_TRACE
  60
  61 /* bulk DMA seems to be behaving for both IN and OUT */
  62 #define USE_DMA
  63
  64 /* ISO too */
  65 #define USE_ISO
  66
  67 #define DRIVER_DESC     "OMAP UDC driver"
  68 #define DRIVER_VERSION  "4 October 2004"
  69
  70 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
  71
  72
  73 /*
  74  * The OMAP UDC needs _very_ early endpoint setup:  before enabling the
  75  * D+ pullup to allow enumeration.  That's too early for the gadget
  76  * framework to use from usb_endpoint_enable(), which happens after
  77  * enumeration as part of activating an interface.  (But if we add an
  78  * optional new "UDC not yet running" state to the gadget driver model,
  79  * even just during driver binding, the endpoint autoconfig logic is the
  80  * natural spot to manufacture new endpoints.)
  81  *
  82  * So instead of using endpoint enable calls to control the hardware setup,
  83  * this driver defines a "fifo mode" parameter.  It's used during driver
  84  * initialization to choose among a set of pre-defined endpoint configs.
  85  * See omap_udc_setup() for available modes, or to add others.  That code
  86  * lives in an init section, so use this driver as a module if you need
  87  * to change the fifo mode after the kernel boots.
  88  *
  89  * Gadget drivers normally ignore endpoints they don't care about, and
  90  * won't include them in configuration descriptors.  That means only
  91  * misbehaving hosts would even notice they exist.
  92  */
  93 #ifdef  USE_ISO
  94 static unsigned fifo_mode = 3;
  95 #else
  96 static unsigned fifo_mode = 0;
  97 #endif
  98
  99 /* "modprobe omap_udc fifo_mode=42", or else as a kernel
 100  * boot parameter "omap_udc:fifo_mode=42"
 101  */
 102 module_param (fifo_mode, uint, 0);
 103 MODULE_PARM_DESC (fifo_mode, "endpoint setup (0 == default)");
 104
 105 #ifdef  USE_DMA
 106 static unsigned use_dma = 1;
 107
 108 /* "modprobe omap_udc use_dma=y", or else as a kernel
 109  * boot parameter "omap_udc:use_dma=y"
 110  */
 111 module_param (use_dma, bool, 0);
 112 MODULE_PARM_DESC (use_dma, "enable/disable DMA");
 113 #else   /* !USE_DMA */
 114
 115 /* save a bit of code */
 116 #define use_dma         0
 117 #endif  /* !USE_DMA */
 118
 119
 120 static const char driver_name [] = "omap_udc";
 121 static const char driver_desc [] = DRIVER_DESC;
 122
 123 /*-------------------------------------------------------------------------*/
 124
 125 /* there's a notion of "current endpoint" for modifying endpoint
 126  * state, and PIO access to its FIFO.
 127  */
 128
 129 static void use_ep(struct omap_ep *ep, u16 select)
 130 {
 131         u16     num = ep->bEndpointAddress & 0x0f;
 132
 133         if (ep->bEndpointAddress & USB_DIR_IN)
 134                 num |= UDC_EP_DIR;
 135         UDC_EP_NUM_REG = num | select;
 136         /* when select, MUST deselect later !! */
 137 }
 138
 139 static inline void deselect_ep(void)
 140 {
 141         UDC_EP_NUM_REG &= ~UDC_EP_SEL;
 142         /* 6 wait states before TX will happen */
 143 }
 144
 145 static void dma_channel_claim(struct omap_ep *ep, unsigned preferred);
 146
 147 /*-------------------------------------------------------------------------*/
 148
 149 static int omap_ep_enable(struct usb_ep *_ep,
 150                 const struct usb_endpoint_descriptor *desc)
 151 {
 152         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
 153         struct omap_udc *udc;
 154         unsigned long   flags;
 155         u16             maxp;
 156
 157         /* catch various bogus parameters */
 158         if (!_ep || !desc || ep->desc
 159                         || desc->bDescriptorType != USB_DT_ENDPOINT
 160                         || ep->bEndpointAddress != desc->bEndpointAddress
 161                         || ep->maxpacket < le16_to_cpu
 162                                                 (desc->wMaxPacketSize)) {
 163                 DBG("%s, bad ep or descriptor\n", __FUNCTION__);
 164                 return -EINVAL;
 165         }
 166         maxp = le16_to_cpu (desc->wMaxPacketSize);
 167         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 168                                 && maxp != ep->maxpacket)
 169                         || le16_to_cpu(desc->wMaxPacketSize) > ep->maxpacket
 170                         || !desc->wMaxPacketSize) {
 171                 DBG("%s, bad %s maxpacket\n", __FUNCTION__, _ep->name);
 172                 return -ERANGE;
 173         }
 174
 175 #ifdef  USE_ISO
 176         if ((desc->bmAttributes == USB_ENDPOINT_XFER_ISOC
 177                                 && desc->bInterval != 1)) {
 178                 /* hardware wants period = 1; USB allows 2^(Interval-1) */
 179                 DBG("%s, unsupported ISO period %dms\n", _ep->name,
 180                                 1 << (desc->bInterval - 1));
 181                 return -EDOM;
 182         }
 183 #else
 184         if (desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 185                 DBG("%s, ISO nyet\n", _ep->name);
 186                 return -EDOM;
 187         }
 188 #endif
 189
 190         /* xfer types must match, except that interrupt ~= bulk */
 191         if (ep->bmAttributes != desc->bmAttributes
 192                         && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 193                         && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 194                 DBG("%s, %s type mismatch\n", __FUNCTION__, _ep->name);
 195                 return -EINVAL;
 196         }
 197
 198         udc = ep->udc;
 199         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
 200                 DBG("%s, bogus device state\n", __FUNCTION__);
 201                 return -ESHUTDOWN;
 202         }
 203
 204         spin_lock_irqsave(&udc->lock, flags);
 205
 206         ep->desc = desc;
 207         ep->irqs = 0;
 208         ep->stopped = 0;
 209         ep->ep.maxpacket = maxp;
 210
 211         /* set endpoint to initial state */
 212         ep->dma_channel = 0;
 213         ep->has_dma = 0;
 214         ep->lch = -1;
 215         use_ep(ep, UDC_EP_SEL);
 216         UDC_CTRL_REG = udc->clr_halt;
 217         ep->ackwait = 0;
 218         deselect_ep();
 219
 220         if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
 221                 list_add(&ep->iso, &udc->iso);
 222
 223         /* maybe assign a DMA channel to this endpoint */
 224         if (use_dma && desc->bmAttributes == USB_ENDPOINT_XFER_BULK)
 225                 /* FIXME ISO can dma, but prefers first channel */
 226                 dma_channel_claim(ep, 0);
 227
 228         /* PIO OUT may RX packets */
 229         if (desc->bmAttributes != USB_ENDPOINT_XFER_ISOC
 230                         && !ep->has_dma
 231                         && !(ep->bEndpointAddress & USB_DIR_IN)) {
 232                 UDC_CTRL_REG = UDC_SET_FIFO_EN;
 233                 ep->ackwait = 1 + ep->double_buf;
 234         }
 235
 236         spin_unlock_irqrestore(&udc->lock, flags);
 237         VDBG("%s enabled\n", _ep->name);
 238         return 0;
 239 }
 240
 241 static void nuke(struct omap_ep *, int status);
 242
 243 static int omap_ep_disable(struct usb_ep *_ep)
 244 {
 245         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
 246         unsigned long   flags;
 247
 248         if (!_ep || !ep->desc) {
 249                 DBG("%s, %s not enabled\n", __FUNCTION__,
 250                         _ep ? ep->ep.name : NULL);
 251                 return -EINVAL;
 252         }
 253
 254         spin_lock_irqsave(&ep->udc->lock, flags);
 255         ep->desc = NULL;
 256         nuke (ep, -ESHUTDOWN);
 257         ep->ep.maxpacket = ep->maxpacket;
 258         ep->has_dma = 0;
 259         UDC_CTRL_REG = UDC_SET_HALT;
 260         list_del_init(&ep->iso);
 261         del_timer(&ep->timer);
 262
 263         spin_unlock_irqrestore(&ep->udc->lock, flags);
 264
 265         VDBG("%s disabled\n", _ep->name);
 266         return 0;
 267 }
 268
 269 /*-------------------------------------------------------------------------*/
 270
 271 static struct usb_request *
 272 omap_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
 273 {
 274         struct omap_req *req;
 275
 276         req = kmalloc(sizeof *req, gfp_flags);
 277         if (req) {
 278                 memset (req, 0, sizeof *req);
 279                 req->req.dma = DMA_ADDR_INVALID;
 280                 INIT_LIST_HEAD (&req->queue);
 281         }
 282         return &req->req;
 283 }
 284
 285 static void
 286 omap_free_request(struct usb_ep *ep, struct usb_request *_req)
 287 {
 288         struct omap_req *req = container_of(_req, struct omap_req, req);
 289
 290         if (_req)
 291                 kfree (req);
 292 }
 293
 294 /*-------------------------------------------------------------------------*/
 295
 296 static void *
 297 omap_alloc_buffer(
 298         struct usb_ep   *_ep,
 299         unsigned        bytes,
 300         dma_addr_t      *dma,
 301         gfp_t           gfp_flags
 302 )
 303 {
 304         void            *retval;
 305         struct omap_ep  *ep;
 306
 307         ep = container_of(_ep, struct omap_ep, ep);
 308         if (use_dma && ep->has_dma) {
 309                 static int      warned;
 310                 if (!warned && bytes < PAGE_SIZE) {
 311                         dev_warn(ep->udc->gadget.dev.parent,
 312                                 "using dma_alloc_coherent for "
 313                                 "small allocations wastes memory\n");
 314                         warned++;
 315                 }
 316                 return dma_alloc_coherent(ep->udc->gadget.dev.parent,
 317                                 bytes, dma, gfp_flags);
 318         }
 319
 320         retval = kmalloc(bytes, gfp_flags);
 321         if (retval)
 322                 *dma = virt_to_phys(retval);
 323         return retval;
 324 }
 325
 326 static void omap_free_buffer(
 327         struct usb_ep   *_ep,
 328         void            *buf,
 329         dma_addr_t      dma,
 330         unsigned        bytes
 331 )
 332 {
 333         struct omap_ep  *ep;
 334
 335         ep = container_of(_ep, struct omap_ep, ep);
 336         if (use_dma && _ep && ep->has_dma)
 337                 dma_free_coherent(ep->udc->gadget.dev.parent, bytes, buf, dma);
 338         else
 339                 kfree (buf);
 340 }
 341
 342 /*-------------------------------------------------------------------------*/
 343
 344 static void
 345 done(struct omap_ep *ep, struct omap_req *req, int status)
 346 {
 347         unsigned                stopped = ep->stopped;
 348
 349         list_del_init(&req->queue);
 350
 351         if (req->req.status == -EINPROGRESS)
 352                 req->req.status = status;
 353         else
 354                 status = req->req.status;
 355
 356         if (use_dma && ep->has_dma) {
 357                 if (req->mapped) {
 358                         dma_unmap_single(ep->udc->gadget.dev.parent,
 359                                 req->req.dma, req->req.length,
 360                                 (ep->bEndpointAddress & USB_DIR_IN)
 361                                         ? DMA_TO_DEVICE
 362                                         : DMA_FROM_DEVICE);
 363                         req->req.dma = DMA_ADDR_INVALID;
 364                         req->mapped = 0;
 365                 } else
 366                         dma_sync_single_for_cpu(ep->udc->gadget.dev.parent,
 367                                 req->req.dma, req->req.length,
 368                                 (ep->bEndpointAddress & USB_DIR_IN)
 369                                         ? DMA_TO_DEVICE
 370                                         : DMA_FROM_DEVICE);
 371         }
 372
 373 #ifndef USB_TRACE
 374         if (status && status != -ESHUTDOWN)
 375 #endif
 376                 VDBG("complete %s req %p stat %d len %u/%u\n",
 377                         ep->ep.name, &req->req, status,
 378                         req->req.actual, req->req.length);
 379
 380         /* don't modify queue heads during completion callback */
 381         ep->stopped = 1;
 382         spin_unlock(&ep->udc->lock);
 383         req->req.complete(&ep->ep, &req->req);
 384         spin_lock(&ep->udc->lock);
 385         ep->stopped = stopped;
 386 }
 387
 388 /*-------------------------------------------------------------------------*/
 389
 390 #define UDC_FIFO_FULL           (UDC_NON_ISO_FIFO_FULL | UDC_ISO_FIFO_FULL)
 391 #define UDC_FIFO_UNWRITABLE     (UDC_EP_HALTED | UDC_FIFO_FULL)
 392
 393 #define FIFO_EMPTY      (UDC_NON_ISO_FIFO_EMPTY | UDC_ISO_FIFO_EMPTY)
 394 #define FIFO_UNREADABLE (UDC_EP_HALTED | FIFO_EMPTY)
 395
 396 static inline int
 397 write_packet(u8 *buf, struct omap_req *req, unsigned max)
 398 {
 399         unsigned        len;
 400         u16             *wp;
 401
 402         len = min(req->req.length - req->req.actual, max);
 403         req->req.actual += len;
 404
 405         max = len;
 406         if (likely((((int)buf) & 1) == 0)) {
 407                 wp = (u16 *)buf;
 408                 while (max >= 2) {
 409                         UDC_DATA_REG = *wp++;
 410                         max -= 2;
 411                 }
 412                 buf = (u8 *)wp;
 413         }
 414         while (max--)
 415                 *(volatile u8 *)&UDC_DATA_REG = *buf++;
 416         return len;
 417 }
 418
 419 // FIXME change r/w fifo calling convention
 420
 421
 422 // return:  0 = still running, 1 = completed, negative = errno
 423 static int write_fifo(struct omap_ep *ep, struct omap_req *req)
 424 {
 425         u8              *buf;
 426         unsigned        count;
 427         int             is_last;
 428         u16             ep_stat;
 429
 430         buf = req->req.buf + req->req.actual;
 431         prefetch(buf);
 432
 433         /* PIO-IN isn't double buffered except for iso */
 434         ep_stat = UDC_STAT_FLG_REG;
 435         if (ep_stat & UDC_FIFO_UNWRITABLE)
 436                 return 0;
 437
 438         count = ep->ep.maxpacket;
 439         count = write_packet(buf, req, count);
 440         UDC_CTRL_REG = UDC_SET_FIFO_EN;
 441         ep->ackwait = 1;
 442
 443         /* last packet is often short (sometimes a zlp) */
 444         if (count != ep->ep.maxpacket)
 445                 is_last = 1;
 446         else if (req->req.length == req->req.actual
 447                         && !req->req.zero)
 448                 is_last = 1;
 449         else
 450                 is_last = 0;
 451
 452         /* NOTE:  requests complete when all IN data is in a
 453          * FIFO (or sometimes later, if a zlp was needed).
 454          * Use usb_ep_fifo_status() where needed.
 455          */
 456         if (is_last)
 457                 done(ep, req, 0);
 458         return is_last;
 459 }
 460
 461 static inline int
 462 read_packet(u8 *buf, struct omap_req *req, unsigned avail)
 463 {
 464         unsigned        len;
 465         u16             *wp;
 466
 467         len = min(req->req.length - req->req.actual, avail);
 468         req->req.actual += len;
 469         avail = len;
 470
 471         if (likely((((int)buf) & 1) == 0)) {
 472                 wp = (u16 *)buf;
 473                 while (avail >= 2) {
 474                         *wp++ = UDC_DATA_REG;
 475                         avail -= 2;
 476                 }
 477                 buf = (u8 *)wp;
 478         }
 479         while (avail--)
 480                 *buf++ = *(volatile u8 *)&UDC_DATA_REG;
 481         return len;
 482 }
 483
 484 // return:  0 = still running, 1 = queue empty, negative = errno
 485 static int read_fifo(struct omap_ep *ep, struct omap_req *req)
 486 {
 487         u8              *buf;
 488         unsigned        count, avail;
 489         int             is_last;
 490
 491         buf = req->req.buf + req->req.actual;
 492         prefetchw(buf);
 493
 494         for (;;) {
 495                 u16     ep_stat = UDC_STAT_FLG_REG;
 496
 497                 is_last = 0;
 498                 if (ep_stat & FIFO_EMPTY) {
 499                         if (!ep->double_buf)
 500                                 break;
 501                         ep->fnf = 1;
 502                 }
 503                 if (ep_stat & UDC_EP_HALTED)
 504                         break;
 505
 506                 if (ep_stat & UDC_FIFO_FULL)
 507                         avail = ep->ep.maxpacket;
 508                 else  {
 509                         avail = UDC_RXFSTAT_REG;
 510                         ep->fnf = ep->double_buf;
 511                 }
 512                 count = read_packet(buf, req, avail);
 513
 514                 /* partial packet reads may not be errors */
 515                 if (count < ep->ep.maxpacket) {
 516                         is_last = 1;
 517                         /* overflowed this request?  flush extra data */
 518                         if (count != avail) {
 519                                 req->req.status = -EOVERFLOW;
 520                                 avail -= count;
 521                                 while (avail--)
 522                                         (void) *(volatile u8 *)&UDC_DATA_REG;
 523                         }
 524                 } else if (req->req.length == req->req.actual)
 525                         is_last = 1;
 526                 else
 527                         is_last = 0;
 528
 529                 if (!ep->bEndpointAddress)
 530                         break;
 531                 if (is_last)
 532                         done(ep, req, 0);
 533                 break;
 534         }
 535         return is_last;
 536 }
 537
 538 /*-------------------------------------------------------------------------*/
 539
 540 static inline dma_addr_t dma_csac(unsigned lch)
 541 {
 542         dma_addr_t      csac;
 543
 544         /* omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
 545          * read before the DMA controller finished disabling the channel.
 546          */
 547         csac = omap_readw(OMAP_DMA_CSAC(lch));
 548         if (csac == 0)
 549                 csac = omap_readw(OMAP_DMA_CSAC(lch));
 550         return csac;
 551 }
 552
 553 static inline dma_addr_t dma_cdac(unsigned lch)
 554 {
 555         dma_addr_t      cdac;
 556
 557         /* omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
 558          * read before the DMA controller finished disabling the channel.
 559          */
 560         cdac = omap_readw(OMAP_DMA_CDAC(lch));
 561         if (cdac == 0)
 562                 cdac = omap_readw(OMAP_DMA_CDAC(lch));
 563         return cdac;
 564 }
 565
 566 static u16 dma_src_len(struct omap_ep *ep, dma_addr_t start)
 567 {
 568         dma_addr_t      end;
 569
 570         /* IN-DMA needs this on fault/cancel paths, so 15xx misreports
 571          * the last transfer's bytecount by more than a FIFO's worth.
 572          */
 573         if (cpu_is_omap15xx())
 574                 return 0;
 575
 576         end = dma_csac(ep->lch);
 577         if (end == ep->dma_counter)
 578                 return 0;
 579
 580         end |= start & (0xffff << 16);
 581         if (end < start)
 582                 end += 0x10000;
 583         return end - start;
 584 }
 585
 586 #define DMA_DEST_LAST(x) (cpu_is_omap15xx() \
 587                 ? omap_readw(OMAP_DMA_CSAC(x)) /* really: CPC */ \
 588                 : dma_cdac(x))
 589
 590 static u16 dma_dest_len(struct omap_ep *ep, dma_addr_t start)
 591 {
 592         dma_addr_t      end;
 593
 594         end = DMA_DEST_LAST(ep->lch);
 595         if (end == ep->dma_counter)
 596                 return 0;
 597
 598         end |= start & (0xffff << 16);
 599         if (cpu_is_omap15xx())
 600                 end++;
 601         if (end < start)
 602                 end += 0x10000;
 603         return end - start;
 604 }
 605
 606
 607 /* Each USB transfer request using DMA maps to one or more DMA transfers.
 608  * When DMA completion isn't request completion, the UDC continues with
 609  * the next DMA transfer for that USB transfer.
 610  */
 611
 612 static void next_in_dma(struct omap_ep *ep, struct omap_req *req)
 613 {
 614         u16             txdma_ctrl;
 615         unsigned        length = req->req.length - req->req.actual;
 616         const int       sync_mode = cpu_is_omap15xx()
 617                                 ? OMAP_DMA_SYNC_FRAME
 618                                 : OMAP_DMA_SYNC_ELEMENT;
 619
 620         /* measure length in either bytes or packets */
 621         if ((cpu_is_omap16xx() && length <= UDC_TXN_TSC)
 622                         || (cpu_is_omap15xx() && length < ep->maxpacket)) {
 623                 txdma_ctrl = UDC_TXN_EOT | length;
 624                 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8,
 625                                 length, 1, sync_mode);
 626         } else {
 627                 length = min(length / ep->maxpacket,
 628                                 (unsigned) UDC_TXN_TSC + 1);
 629                 txdma_ctrl = length;
 630                 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
 631                                 ep->ep.maxpacket >> 1, length, sync_mode);
 632                 length *= ep->maxpacket;
 633         }
 634         omap_set_dma_src_params(ep->lch, OMAP_DMA_PORT_EMIFF,
 635                 OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual);
 636
 637         omap_start_dma(ep->lch);
 638         ep->dma_counter = dma_csac(ep->lch);
 639         UDC_DMA_IRQ_EN_REG |= UDC_TX_DONE_IE(ep->dma_channel);
 640         UDC_TXDMA_REG(ep->dma_channel) = UDC_TXN_START | txdma_ctrl;
 641         req->dma_bytes = length;
 642 }
 643
 644 static void finish_in_dma(struct omap_ep *ep, struct omap_req *req, int status)
 645 {
 646         if (status == 0) {
 647                 req->req.actual += req->dma_bytes;
 648
 649                 /* return if this request needs to send data or zlp */
 650                 if (req->req.actual < req->req.length)
 651                         return;
 652                 if (req->req.zero
 653                                 && req->dma_bytes != 0
 654                                 && (req->req.actual % ep->maxpacket) == 0)
 655                         return;
 656         } else
 657                 req->req.actual += dma_src_len(ep, req->req.dma
 658                                                         + req->req.actual);
 659
 660         /* tx completion */
 661         omap_stop_dma(ep->lch);
 662         UDC_DMA_IRQ_EN_REG &= ~UDC_TX_DONE_IE(ep->dma_channel);
 663         done(ep, req, status);
 664 }
 665
 666 static void next_out_dma(struct omap_ep *ep, struct omap_req *req)
 667 {
 668         unsigned packets;
 669
 670         /* NOTE:  we filtered out "short reads" before, so we know
 671          * the buffer has only whole numbers of packets.
 672          */
 673
 674         /* set up this DMA transfer, enable the fifo, start */
 675         packets = (req->req.length - req->req.actual) / ep->ep.maxpacket;
 676         packets = min(packets, (unsigned)UDC_RXN_TC + 1);
 677         req->dma_bytes = packets * ep->ep.maxpacket;
 678         omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
 679                         ep->ep.maxpacket >> 1, packets,
 680                         OMAP_DMA_SYNC_ELEMENT);
 681         omap_set_dma_dest_params(ep->lch, OMAP_DMA_PORT_EMIFF,
 682                 OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual);
 683         ep->dma_counter = DMA_DEST_LAST(ep->lch);
 684
 685         UDC_RXDMA_REG(ep->dma_channel) = UDC_RXN_STOP | (packets - 1);
 686         UDC_DMA_IRQ_EN_REG |= UDC_RX_EOT_IE(ep->dma_channel);
 687         UDC_EP_NUM_REG = (ep->bEndpointAddress & 0xf);
 688         UDC_CTRL_REG = UDC_SET_FIFO_EN;
 689
 690         omap_start_dma(ep->lch);
 691 }
 692
 693 static void
 694 finish_out_dma(struct omap_ep *ep, struct omap_req *req, int status, int one)
 695 {
 696         u16     count;
 697
 698         if (status == 0)
 699                 ep->dma_counter = (u16) (req->req.dma + req->req.actual);
 700         count = dma_dest_len(ep, req->req.dma + req->req.actual);
 701         count += req->req.actual;
 702         if (one)
 703                 count--;
 704         if (count <= req->req.length)
 705                 req->req.actual = count;
 706
 707         if (count != req->dma_bytes || status)
 708                 omap_stop_dma(ep->lch);
 709
 710         /* if this wasn't short, request may need another transfer */
 711         else if (req->req.actual < req->req.length)
 712                 return;
 713
 714         /* rx completion */
 715         UDC_DMA_IRQ_EN_REG &= ~UDC_RX_EOT_IE(ep->dma_channel);
 716         done(ep, req, status);
 717 }
 718
 719 static void dma_irq(struct omap_udc *udc, u16 irq_src)
 720 {
 721         u16             dman_stat = UDC_DMAN_STAT_REG;
 722         struct omap_ep  *ep;
 723         struct omap_req *req;
 724
 725         /* IN dma: tx to host */
 726         if (irq_src & UDC_TXN_DONE) {
 727                 ep = &udc->ep[16 + UDC_DMA_TX_SRC(dman_stat)];
 728                 ep->irqs++;
 729                 /* can see TXN_DONE after dma abort */
 730                 if (!list_empty(&ep->queue)) {
 731                         req = container_of(ep->queue.next,
 732                                                 struct omap_req, queue);
 733                         finish_in_dma(ep, req, 0);
 734                 }
 735                 UDC_IRQ_SRC_REG = UDC_TXN_DONE;
 736
 737                 if (!list_empty (&ep->queue)) {
 738                         req = container_of(ep->queue.next,
 739                                         struct omap_req, queue);
 740                         next_in_dma(ep, req);
 741                 }
 742         }
 743
 744         /* OUT dma: rx from host */
 745         if (irq_src & UDC_RXN_EOT) {
 746                 ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
 747                 ep->irqs++;
 748                 /* can see RXN_EOT after dma abort */
 749                 if (!list_empty(&ep->queue)) {
 750                         req = container_of(ep->queue.next,
 751                                         struct omap_req, queue);
 752                         finish_out_dma(ep, req, 0, dman_stat & UDC_DMA_RX_SB);
 753                 }
 754                 UDC_IRQ_SRC_REG = UDC_RXN_EOT;
 755
 756                 if (!list_empty (&ep->queue)) {
 757                         req = container_of(ep->queue.next,
 758                                         struct omap_req, queue);
 759                         next_out_dma(ep, req);
 760                 }
 761         }
 762
 763         if (irq_src & UDC_RXN_CNT) {
 764                 ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
 765                 ep->irqs++;
 766                 /* omap15xx does this unasked... */
 767                 VDBG("%s, RX_CNT irq?\n", ep->ep.name);
 768                 UDC_IRQ_SRC_REG = UDC_RXN_CNT;
 769         }
 770 }
 771
 772 static void dma_error(int lch, u16 ch_status, void *data)
 773 {
 774         struct omap_ep  *ep = data;
 775
 776         /* if ch_status & OMAP_DMA_DROP_IRQ ... */
 777         /* if ch_status & OMAP_DMA_TOUT_IRQ ... */
 778         ERR("%s dma error, lch %d status %02x\n", ep->ep.name, lch, ch_status);
 779
 780         /* complete current transfer ... */
 781 }
 782
 783 static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
 784 {
 785         u16     reg;
 786         int     status, restart, is_in;
 787
 788         is_in = ep->bEndpointAddress & USB_DIR_IN;
 789         if (is_in)
 790                 reg = UDC_TXDMA_CFG_REG;
 791         else
 792                 reg = UDC_RXDMA_CFG_REG;
 793         reg |= UDC_DMA_REQ;             /* "pulse" activated */
 794
 795         ep->dma_channel = 0;
 796         ep->lch = -1;
 797         if (channel == 0 || channel > 3) {
 798                 if ((reg & 0x0f00) == 0)
 799                         channel = 3;
 800                 else if ((reg & 0x00f0) == 0)
 801                         channel = 2;
 802                 else if ((reg & 0x000f) == 0)   /* preferred for ISO */
 803                         channel = 1;
 804                 else {
 805                         status = -EMLINK;
 806                         goto just_restart;
 807                 }
 808         }
 809         reg |= (0x0f & ep->bEndpointAddress) << (4 * (channel - 1));
 810         ep->dma_channel = channel;
 811
 812         if (is_in) {
 813                 status = omap_request_dma(OMAP_DMA_USB_W2FC_TX0 - 1 + channel,
 814                         ep->ep.name, dma_error, ep, &ep->lch);
 815                 if (status == 0) {
 816                         UDC_TXDMA_CFG_REG = reg;
 817                         /* EMIFF */
 818                         omap_set_dma_src_burst_mode(ep->lch,
 819                                                 OMAP_DMA_DATA_BURST_4);
 820                         omap_set_dma_src_data_pack(ep->lch, 1);
 821                         /* TIPB */
 822                         omap_set_dma_dest_params(ep->lch,
 823                                 OMAP_DMA_PORT_TIPB,
 824                                 OMAP_DMA_AMODE_CONSTANT,
 825                                 (unsigned long) io_v2p((u32)&UDC_DATA_DMA_REG));
 826                 }
 827         } else {
 828                 status = omap_request_dma(OMAP_DMA_USB_W2FC_RX0 - 1 + channel,
 829                         ep->ep.name, dma_error, ep, &ep->lch);
 830                 if (status == 0) {
 831                         UDC_RXDMA_CFG_REG = reg;
 832                         /* TIPB */
 833                         omap_set_dma_src_params(ep->lch,
 834                                 OMAP_DMA_PORT_TIPB,
 835                                 OMAP_DMA_AMODE_CONSTANT,
 836                                 (unsigned long) io_v2p((u32)&UDC_DATA_DMA_REG));
 837                         /* EMIFF */
 838                         omap_set_dma_dest_burst_mode(ep->lch,
 839                                                 OMAP_DMA_DATA_BURST_4);
 840                         omap_set_dma_dest_data_pack(ep->lch, 1);
 841                 }
 842         }
 843         if (status)
 844                 ep->dma_channel = 0;
 845         else {
 846                 ep->has_dma = 1;
 847                 omap_disable_dma_irq(ep->lch, OMAP_DMA_BLOCK_IRQ);
 848
 849                 /* channel type P: hw synch (fifo) */
 850                 if (!cpu_is_omap15xx())
 851                         omap_writew(2, OMAP_DMA_LCH_CTRL(ep->lch));
 852         }
 853
 854 just_restart:
 855         /* restart any queue, even if the claim failed  */
 856         restart = !ep->stopped && !list_empty(&ep->queue);
 857
 858         if (status)
 859                 DBG("%s no dma channel: %d%s\n", ep->ep.name, status,
 860                         restart ? " (restart)" : "");
 861         else
 862                 DBG("%s claimed %cxdma%d lch %d%s\n", ep->ep.name,
 863                         is_in ? 't' : 'r',
 864                         ep->dma_channel - 1, ep->lch,
 865                         restart ? " (restart)" : "");
 866
 867         if (restart) {
 868                 struct omap_req *req;
 869                 req = container_of(ep->queue.next, struct omap_req, queue);
 870                 if (ep->has_dma)
 871                         (is_in ? next_in_dma : next_out_dma)(ep, req);
 872                 else {
 873                         use_ep(ep, UDC_EP_SEL);
 874                         (is_in ? write_fifo : read_fifo)(ep, req);
 875                         deselect_ep();
 876                         if (!is_in) {
 877                                 UDC_CTRL_REG = UDC_SET_FIFO_EN;
 878                                 ep->ackwait = 1 + ep->double_buf;
 879                         }
 880                         /* IN: 6 wait states before it'll tx */
 881                 }
 882         }
 883 }
 884
 885 static void dma_channel_release(struct omap_ep *ep)
 886 {
 887         int             shift = 4 * (ep->dma_channel - 1);
 888         u16             mask = 0x0f << shift;
 889         struct omap_req *req;
 890         int             active;
 891
 892         /* abort any active usb transfer request */
 893         if (!list_empty(&ep->queue))
 894                 req = container_of(ep->queue.next, struct omap_req, queue);
 895         else
 896                 req = NULL;
 897
 898         active = ((1 << 7) & omap_readl(OMAP_DMA_CCR(ep->lch))) != 0;
 899
 900         DBG("%s release %s %cxdma%d %p\n", ep->ep.name,
 901                         active ? "active" : "idle",
 902                         (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
 903                         ep->dma_channel - 1, req);
 904
 905         /* NOTE: re-setting RX_REQ/TX_REQ because of a chip bug (before
 906          * OMAP 1710 ES2.0) where reading the DMA_CFG can clear them.
 907          */
 908
 909         /* wait till current packet DMA finishes, and fifo empties */
 910         if (ep->bEndpointAddress & USB_DIR_IN) {
 911                 UDC_TXDMA_CFG_REG = (UDC_TXDMA_CFG_REG & ~mask) | UDC_DMA_REQ;
 912
 913                 if (req) {
 914                         finish_in_dma(ep, req, -ECONNRESET);
 915
 916                         /* clear FIFO; hosts probably won't empty it */
 917                         use_ep(ep, UDC_EP_SEL);
 918                         UDC_CTRL_REG = UDC_CLR_EP;
 919                         deselect_ep();
 920                 }
 921                 while (UDC_TXDMA_CFG_REG & mask)
 922                         udelay(10);
 923         } else {
 924                 UDC_RXDMA_CFG_REG = (UDC_RXDMA_CFG_REG & ~mask) | UDC_DMA_REQ;
 925
 926                 /* dma empties the fifo */
 927                 while (UDC_RXDMA_CFG_REG & mask)
 928                         udelay(10);
 929                 if (req)
 930                         finish_out_dma(ep, req, -ECONNRESET, 0);
 931         }
 932         omap_free_dma(ep->lch);
 933         ep->dma_channel = 0;
 934         ep->lch = -1;
 935         /* has_dma still set, till endpoint is fully quiesced */
 936 }
 937
 938
 939 /*-------------------------------------------------------------------------*/
 940
 941 static int
 942 omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 943 {
 944         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
 945         struct omap_req *req = container_of(_req, struct omap_req, req);
 946         struct omap_udc *udc;
 947         unsigned long   flags;
 948         int             is_iso = 0;
 949
 950         /* catch various bogus parameters */
 951         if (!_req || !req->req.complete || !req->req.buf
 952                         || !list_empty(&req->queue)) {
 953                 DBG("%s, bad params\n", __FUNCTION__);
 954                 return -EINVAL;
 955         }
 956         if (!_ep || (!ep->desc && ep->bEndpointAddress)) {
 957                 DBG("%s, bad ep\n", __FUNCTION__);
 958                 return -EINVAL;
 959         }
 960         if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 961                 if (req->req.length > ep->ep.maxpacket)
 962                         return -EMSGSIZE;
 963                 is_iso = 1;
 964         }
 965
 966         /* this isn't bogus, but OMAP DMA isn't the only hardware to
 967          * have a hard time with partial packet reads...  reject it.
 968          */
 969         if (use_dma
 970                         && ep->has_dma
 971                         && ep->bEndpointAddress != 0
 972                         && (ep->bEndpointAddress & USB_DIR_IN) == 0
 973                         && (req->req.length % ep->ep.maxpacket) != 0) {
 974                 DBG("%s, no partial packet OUT reads\n", __FUNCTION__);
 975                 return -EMSGSIZE;
 976         }
 977
 978         udc = ep->udc;
 979         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
 980                 return -ESHUTDOWN;
 981
 982         if (use_dma && ep->has_dma) {
 983                 if (req->req.dma == DMA_ADDR_INVALID) {
 984                         req->req.dma = dma_map_single(
 985                                 ep->udc->gadget.dev.parent,
 986                                 req->req.buf,
 987                                 req->req.length,
 988                                 (ep->bEndpointAddress & USB_DIR_IN)
 989                                         ? DMA_TO_DEVICE
 990                                         : DMA_FROM_DEVICE);
 991                         req->mapped = 1;
 992                 } else {
 993                         dma_sync_single_for_device(
 994                                 ep->udc->gadget.dev.parent,
 995                                 req->req.dma, req->req.length,
 996                                 (ep->bEndpointAddress & USB_DIR_IN)
 997                                         ? DMA_TO_DEVICE
 998                                         : DMA_FROM_DEVICE);
 999                         req->mapped = 0;
1000                 }
1001         }
1002
1003         VDBG("%s queue req %p, len %d buf %p\n",
1004                 ep->ep.name, _req, _req->length, _req->buf);
1005
1006         spin_lock_irqsave(&udc->lock, flags);
1007
1008         req->req.status = -EINPROGRESS;
1009         req->req.actual = 0;
1010
1011         /* maybe kickstart non-iso i/o queues */
1012         if (is_iso)
1013                 UDC_IRQ_EN_REG |= UDC_SOF_IE;
1014         else if (list_empty(&ep->queue) && !ep->stopped && !ep->ackwait) {
1015                 int     is_in;
1016
1017                 if (ep->bEndpointAddress == 0) {
1018                         if (!udc->ep0_pending || !list_empty (&ep->queue)) {
1019                                 spin_unlock_irqrestore(&udc->lock, flags);
1020                                 return -EL2HLT;
1021                         }
1022
1023                         /* empty DATA stage? */
1024                         is_in = udc->ep0_in;
1025                         if (!req->req.length) {
1026
1027                                 /* chip became CONFIGURED or ADDRESSED
1028                                  * earlier; drivers may already have queued
1029                                  * requests to non-control endpoints
1030                                  */
1031                                 if (udc->ep0_set_config) {
1032                                         u16     irq_en = UDC_IRQ_EN_REG;
1033
1034                                         irq_en |= UDC_DS_CHG_IE | UDC_EP0_IE;
1035                                         if (!udc->ep0_reset_config)
1036                                                 irq_en |= UDC_EPN_RX_IE
1037                                                         | UDC_EPN_TX_IE;
1038                                         UDC_IRQ_EN_REG = irq_en;
1039                                 }
1040
1041                                 /* STATUS for zero length DATA stages is
1042                                  * always an IN ... even for IN transfers,
1043                                  * a wierd case which seem to stall OMAP.
1044                                  */
1045                                 UDC_EP_NUM_REG = (UDC_EP_SEL|UDC_EP_DIR);
1046                                 UDC_CTRL_REG = UDC_CLR_EP;
1047                                 UDC_CTRL_REG = UDC_SET_FIFO_EN;
1048                                 UDC_EP_NUM_REG = UDC_EP_DIR;
1049
1050                                 /* cleanup */
1051                                 udc->ep0_pending = 0;
1052                                 done(ep, req, 0);
1053                                 req = NULL;
1054
1055                         /* non-empty DATA stage */
1056                         } else if (is_in) {
1057                                 UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
1058                         } else {
1059                                 if (udc->ep0_setup)
1060                                         goto irq_wait;
1061                                 UDC_EP_NUM_REG = UDC_EP_SEL;
1062                         }
1063                 } else {
1064                         is_in = ep->bEndpointAddress & USB_DIR_IN;
1065                         if (!ep->has_dma)
1066                                 use_ep(ep, UDC_EP_SEL);
1067                         /* if ISO: SOF IRQs must be enabled/disabled! */
1068                 }
1069
1070                 if (ep->has_dma)
1071                         (is_in ? next_in_dma : next_out_dma)(ep, req);
1072                 else if (req) {
1073                         if ((is_in ? write_fifo : read_fifo)(ep, req) == 1)
1074                                 req = NULL;
1075                         deselect_ep();
1076                         if (!is_in) {
1077                                 UDC_CTRL_REG = UDC_SET_FIFO_EN;
1078                                 ep->ackwait = 1 + ep->double_buf;
1079                         }
1080                         /* IN: 6 wait states before it'll tx */
1081                 }
1082         }
1083
1084 irq_wait:
1085         /* irq handler advances the queue */
1086         if (req != NULL)
1087                 list_add_tail(&req->queue, &ep->queue);
1088         spin_unlock_irqrestore(&udc->lock, flags);
1089
1090         return 0;
1091 }
1092
1093 static int omap_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1094 {
1095         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
1096         struct omap_req *req;
1097         unsigned long   flags;
1098
1099         if (!_ep || !_req)
1100                 return -EINVAL;
1101
1102         spin_lock_irqsave(&ep->udc->lock, flags);
1103
1104         /* make sure it's actually queued on this endpoint */
1105         list_for_each_entry (req, &ep->queue, queue) {
1106                 if (&req->req == _req)
1107                         break;
1108         }
1109         if (&req->req != _req) {
1110                 spin_unlock_irqrestore(&ep->udc->lock, flags);
1111                 return -EINVAL;
1112         }
1113
1114         if (use_dma && ep->dma_channel && ep->queue.next == &req->queue) {
1115                 int channel = ep->dma_channel;
1116
1117                 /* releasing the channel cancels the request,
1118                  * reclaiming the channel restarts the queue
1119                  */
1120                 dma_channel_release(ep);
1121                 dma_channel_claim(ep, channel);
1122         } else
1123                 done(ep, req, -ECONNRESET);
1124         spin_unlock_irqrestore(&ep->udc->lock, flags);
1125         return 0;
1126 }
1127
1128 /*-------------------------------------------------------------------------*/
1129
1130 static int omap_ep_set_halt(struct usb_ep *_ep, int value)
1131 {
1132         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
1133         unsigned long   flags;
1134         int             status = -EOPNOTSUPP;
1135
1136         spin_lock_irqsave(&ep->udc->lock, flags);
1137
1138         /* just use protocol stalls for ep0; real halts are annoying */
1139         if (ep->bEndpointAddress == 0) {
1140                 if (!ep->udc->ep0_pending)
1141                         status = -EINVAL;
1142                 else if (value) {
1143                         if (ep->udc->ep0_set_config) {
1144                                 WARN("error changing config?\n");
1145                                 UDC_SYSCON2_REG = UDC_CLR_CFG;
1146                         }
1147                         UDC_SYSCON2_REG = UDC_STALL_CMD;
1148                         ep->udc->ep0_pending = 0;
1149                         status = 0;
1150                 } else /* NOP */
1151                         status = 0;
1152
1153         /* otherwise, all active non-ISO endpoints can halt */
1154         } else if (ep->bmAttributes != USB_ENDPOINT_XFER_ISOC && ep->desc) {
1155
1156                 /* IN endpoints must already be idle */
1157                 if ((ep->bEndpointAddress & USB_DIR_IN)
1158                                 && !list_empty(&ep->queue)) {
1159                         status = -EAGAIN;
1160                         goto done;
1161                 }
1162
1163                 if (value) {
1164                         int     channel;
1165
1166                         if (use_dma && ep->dma_channel
1167                                         && !list_empty(&ep->queue)) {
1168                                 channel = ep->dma_channel;
1169                                 dma_channel_release(ep);
1170                         } else
1171                                 channel = 0;
1172
1173                         use_ep(ep, UDC_EP_SEL);
1174                         if (UDC_STAT_FLG_REG & UDC_NON_ISO_FIFO_EMPTY) {
1175                                 UDC_CTRL_REG = UDC_SET_HALT;
1176                                 status = 0;
1177                         } else
1178                                 status = -EAGAIN;
1179                         deselect_ep();
1180
1181                         if (channel)
1182                                 dma_channel_claim(ep, channel);
1183                 } else {
1184                         use_ep(ep, 0);
1185                         UDC_CTRL_REG = ep->udc->clr_halt;
1186                         ep->ackwait = 0;
1187                         if (!(ep->bEndpointAddress & USB_DIR_IN)) {
1188                                 UDC_CTRL_REG = UDC_SET_FIFO_EN;
1189                                 ep->ackwait = 1 + ep->double_buf;
1190                         }
1191                 }
1192         }
1193 done:
1194         VDBG("%s %s halt stat %d\n", ep->ep.name,
1195                 value ? "set" : "clear", status);
1196
1197         spin_unlock_irqrestore(&ep->udc->lock, flags);
1198         return status;
1199 }
1200
1201 static struct usb_ep_ops omap_ep_ops = {
1202         .enable         = omap_ep_enable,
1203         .disable        = omap_ep_disable,
1204
1205         .alloc_request  = omap_alloc_request,
1206         .free_request   = omap_free_request,
1207
1208         .alloc_buffer   = omap_alloc_buffer,
1209         .free_buffer    = omap_free_buffer,
1210
1211         .queue          = omap_ep_queue,
1212         .dequeue        = omap_ep_dequeue,
1213
1214         .set_halt       = omap_ep_set_halt,
1215         // fifo_status ... report bytes in fifo
1216         // fifo_flush ... flush fifo
1217 };
1218
1219 /*-------------------------------------------------------------------------*/
1220
1221 static int omap_get_frame(struct usb_gadget *gadget)
1222 {
1223         u16     sof = UDC_SOF_REG;
1224         return (sof & UDC_TS_OK) ? (sof & UDC_TS) : -EL2NSYNC;
1225 }
1226
1227 static int omap_wakeup(struct usb_gadget *gadget)
1228 {
1229         struct omap_udc *udc;
1230         unsigned long   flags;
1231         int             retval = -EHOSTUNREACH;
1232
1233         udc = container_of(gadget, struct omap_udc, gadget);
1234
1235         spin_lock_irqsave(&udc->lock, flags);
1236         if (udc->devstat & UDC_SUS) {
1237                 /* NOTE:  OTG spec erratum says that OTG devices may
1238                  * issue wakeups without host enable.
1239                  */
1240                 if (udc->devstat & (UDC_B_HNP_ENABLE|UDC_R_WK_OK)) {
1241                         DBG("remote wakeup...\n");
1242                         UDC_SYSCON2_REG = UDC_RMT_WKP;
1243                         retval = 0;
1244                 }
1245
1246         /* NOTE:  non-OTG systems may use SRP TOO... */
1247         } else if (!(udc->devstat & UDC_ATT)) {
1248                 if (udc->transceiver)
1249                         retval = otg_start_srp(udc->transceiver);
1250         }
1251         spin_unlock_irqrestore(&udc->lock, flags);
1252
1253         return retval;
1254 }
1255
1256 static int
1257 omap_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
1258 {
1259         struct omap_udc *udc;
1260         unsigned long   flags;
1261         u16             syscon1;
1262
1263         udc = container_of(gadget, struct omap_udc, gadget);
1264         spin_lock_irqsave(&udc->lock, flags);
1265         syscon1 = UDC_SYSCON1_REG;
1266         if (is_selfpowered)
1267                 syscon1 |= UDC_SELF_PWR;
1268         else
1269                 syscon1 &= ~UDC_SELF_PWR;
1270         UDC_SYSCON1_REG = syscon1;
1271         spin_unlock_irqrestore(&udc->lock, flags);
1272
1273         return 0;
1274 }
1275
1276 static int can_pullup(struct omap_udc *udc)
1277 {
1278         return udc->driver && udc->softconnect && udc->vbus_active;
1279 }
1280
1281 static void pullup_enable(struct omap_udc *udc)
1282 {
1283         udc->gadget.dev.parent->power.power_state = PMSG_ON;
1284         udc->gadget.dev.power.power_state = PMSG_ON;
1285         UDC_SYSCON1_REG |= UDC_PULLUP_EN;
1286 #ifndef CONFIG_USB_OTG
1287         if (!cpu_is_omap15xx())
1288                 OTG_CTRL_REG |= OTG_BSESSVLD;
1289 #endif
1290         UDC_IRQ_EN_REG = UDC_DS_CHG_IE;
1291 }
1292
1293 static void pullup_disable(struct omap_udc *udc)
1294 {
1295 #ifndef CONFIG_USB_OTG
1296         if (!cpu_is_omap15xx())
1297                 OTG_CTRL_REG &= ~OTG_BSESSVLD;
1298 #endif
1299         UDC_IRQ_EN_REG = UDC_DS_CHG_IE;
1300         UDC_SYSCON1_REG &= ~UDC_PULLUP_EN;
1301 }
1302
1303 /*
1304  * Called by whatever detects VBUS sessions:  external transceiver
1305  * driver, or maybe GPIO0 VBUS IRQ.  May request 48 MHz clock.
1306  */
1307 static int omap_vbus_session(struct usb_gadget *gadget, int is_active)
1308 {
1309         struct omap_udc *udc;
1310         unsigned long   flags;
1311
1312         udc = container_of(gadget, struct omap_udc, gadget);
1313         spin_lock_irqsave(&udc->lock, flags);
1314         VDBG("VBUS %s\n", is_active ? "on" : "off");
1315         udc->vbus_active = (is_active != 0);
1316         if (cpu_is_omap15xx()) {
1317                 /* "software" detect, ignored if !VBUS_MODE_1510 */
1318                 if (is_active)
1319                         FUNC_MUX_CTRL_0_REG |= VBUS_CTRL_1510;
1320                 else
1321                         FUNC_MUX_CTRL_0_REG &= ~VBUS_CTRL_1510;
1322         }
1323         if (can_pullup(udc))
1324                 pullup_enable(udc);
1325         else
1326                 pullup_disable(udc);
1327         spin_unlock_irqrestore(&udc->lock, flags);
1328         return 0;
1329 }
1330
1331 static int omap_vbus_draw(struct usb_gadget *gadget, unsigned mA)
1332 {
1333         struct omap_udc *udc;
1334
1335         udc = container_of(gadget, struct omap_udc, gadget);
1336         if (udc->transceiver)
1337                 return otg_set_power(udc->transceiver, mA);
1338         return -EOPNOTSUPP;
1339 }
1340
1341 static int omap_pullup(struct usb_gadget *gadget, int is_on)
1342 {
1343         struct omap_udc *udc;
1344         unsigned long   flags;
1345
1346         udc = container_of(gadget, struct omap_udc, gadget);
1347         spin_lock_irqsave(&udc->lock, flags);
1348         udc->softconnect = (is_on != 0);
1349         if (can_pullup(udc))
1350                 pullup_enable(udc);
1351         else
1352                 pullup_disable(udc);
1353         spin_unlock_irqrestore(&udc->lock, flags);
1354         return 0;
1355 }
1356
1357 static struct usb_gadget_ops omap_gadget_ops = {
1358         .get_frame              = omap_get_frame,
1359         .wakeup                 = omap_wakeup,
1360         .set_selfpowered        = omap_set_selfpowered,
1361         .vbus_session           = omap_vbus_session,
1362         .vbus_draw              = omap_vbus_draw,
1363         .pullup                 = omap_pullup,
1364 };
1365
1366 /*-------------------------------------------------------------------------*/
1367
1368 /* dequeue ALL requests; caller holds udc->lock */
1369 static void nuke(struct omap_ep *ep, int status)
1370 {
1371         struct omap_req *req;
1372
1373         ep->stopped = 1;
1374
1375         if (use_dma && ep->dma_channel)
1376                 dma_channel_release(ep);
1377
1378         use_ep(ep, 0);
1379         UDC_CTRL_REG = UDC_CLR_EP;
1380         if (ep->bEndpointAddress && ep->bmAttributes != USB_ENDPOINT_XFER_ISOC)
1381                 UDC_CTRL_REG = UDC_SET_HALT;
1382
1383         while (!list_empty(&ep->queue)) {
1384                 req = list_entry(ep->queue.next, struct omap_req, queue);
1385                 done(ep, req, status);
1386         }
1387 }
1388
1389 /* caller holds udc->lock */
1390 static void udc_quiesce(struct omap_udc *udc)
1391 {
1392         struct omap_ep  *ep;
1393
1394         udc->gadget.speed = USB_SPEED_UNKNOWN;
1395         nuke(&udc->ep[0], -ESHUTDOWN);
1396         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list)
1397                 nuke(ep, -ESHUTDOWN);
1398 }
1399
1400 /*-------------------------------------------------------------------------*/
1401
1402 static void update_otg(struct omap_udc *udc)
1403 {
1404         u16     devstat;
1405
1406         if (!udc->gadget.is_otg)
1407                 return;
1408
1409         if (OTG_CTRL_REG & OTG_ID)
1410                 devstat = UDC_DEVSTAT_REG;
1411         else
1412                 devstat = 0;
1413
1414         udc->gadget.b_hnp_enable = !!(devstat & UDC_B_HNP_ENABLE);
1415         udc->gadget.a_hnp_support = !!(devstat & UDC_A_HNP_SUPPORT);
1416         udc->gadget.a_alt_hnp_support = !!(devstat & UDC_A_ALT_HNP_SUPPORT);
1417
1418         /* Enable HNP early, avoiding races on suspend irq path.
1419          * ASSUMES OTG state machine B_BUS_REQ input is true.
1420          */
1421         if (udc->gadget.b_hnp_enable)
1422                 OTG_CTRL_REG = (OTG_CTRL_REG | OTG_B_HNPEN | OTG_B_BUSREQ)
1423                                 & ~OTG_PULLUP;
1424 }
1425
1426 static void ep0_irq(struct omap_udc *udc, u16 irq_src)
1427 {
1428         struct omap_ep  *ep0 = &udc->ep[0];
1429         struct omap_req *req = NULL;
1430
1431         ep0->irqs++;
1432
1433         /* Clear any pending requests and then scrub any rx/tx state
1434          * before starting to handle the SETUP request.
1435          */
1436         if (irq_src & UDC_SETUP) {
1437                 u16     ack = irq_src & (UDC_EP0_TX|UDC_EP0_RX);
1438
1439                 nuke(ep0, 0);
1440                 if (ack) {
1441                         UDC_IRQ_SRC_REG = ack;
1442                         irq_src = UDC_SETUP;
1443                 }
1444         }
1445
1446         /* IN/OUT packets mean we're in the DATA or STATUS stage.
1447          * This driver uses only uses protocol stalls (ep0 never halts),
1448          * and if we got this far the gadget driver already had a
1449          * chance to stall.  Tries to be forgiving of host oddities.
1450          *
1451          * NOTE:  the last chance gadget drivers have to stall control
1452          * requests is during their request completion callback.
1453          */
1454         if (!list_empty(&ep0->queue))
1455                 req = container_of(ep0->queue.next, struct omap_req, queue);
1456
1457         /* IN == TX to host */
1458         if (irq_src & UDC_EP0_TX) {
1459                 int     stat;
1460
1461                 UDC_IRQ_SRC_REG = UDC_EP0_TX;
1462                 UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
1463                 stat = UDC_STAT_FLG_REG;
1464                 if (stat & UDC_ACK) {
1465                         if (udc->ep0_in) {
1466                                 /* write next IN packet from response,
1467                                  * or set up the status stage.
1468                                  */
1469                                 if (req)
1470                                         stat = write_fifo(ep0, req);
1471                                 UDC_EP_NUM_REG = UDC_EP_DIR;
1472                                 if (!req && udc->ep0_pending) {
1473                                         UDC_EP_NUM_REG = UDC_EP_SEL;
1474                                         UDC_CTRL_REG = UDC_CLR_EP;
1475                                         UDC_CTRL_REG = UDC_SET_FIFO_EN;
1476                                         UDC_EP_NUM_REG = 0;
1477                                         udc->ep0_pending = 0;
1478                                 } /* else:  6 wait states before it'll tx */
1479                         } else {
1480                                 /* ack status stage of OUT transfer */
1481                                 UDC_EP_NUM_REG = UDC_EP_DIR;
1482                                 if (req)
1483                                         done(ep0, req, 0);
1484                         }
1485                         req = NULL;
1486                 } else if (stat & UDC_STALL) {
1487                         UDC_CTRL_REG = UDC_CLR_HALT;
1488                         UDC_EP_NUM_REG = UDC_EP_DIR;
1489                 } else {
1490                         UDC_EP_NUM_REG = UDC_EP_DIR;
1491                 }
1492         }
1493
1494         /* OUT == RX from host */
1495         if (irq_src & UDC_EP0_RX) {
1496                 int     stat;
1497
1498                 UDC_IRQ_SRC_REG = UDC_EP0_RX;
1499                 UDC_EP_NUM_REG = UDC_EP_SEL;
1500                 stat = UDC_STAT_FLG_REG;
1501                 if (stat & UDC_ACK) {
1502                         if (!udc->ep0_in) {
1503                                 stat = 0;
1504                                 /* read next OUT packet of request, maybe
1505                                  * reactiviting the fifo; stall on errors.
1506                                  */
1507                                 if (!req || (stat = read_fifo(ep0, req)) < 0) {
1508                                         UDC_SYSCON2_REG = UDC_STALL_CMD;
1509                                         udc->ep0_pending = 0;
1510                                         stat = 0;
1511                                 } else if (stat == 0)
1512                                         UDC_CTRL_REG = UDC_SET_FIFO_EN;
1513                                 UDC_EP_NUM_REG = 0;
1514
1515                                 /* activate status stage */
1516                                 if (stat == 1) {
1517                                         done(ep0, req, 0);
1518                                         /* that may have STALLed ep0... */
1519                                         UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
1520                                         UDC_CTRL_REG = UDC_CLR_EP;
1521                                         UDC_CTRL_REG = UDC_SET_FIFO_EN;
1522                                         UDC_EP_NUM_REG = UDC_EP_DIR;
1523                                         udc->ep0_pending = 0;
1524                                 }
1525                         } else {
1526                                 /* ack status stage of IN transfer */
1527                                 UDC_EP_NUM_REG = 0;
1528                                 if (req)
1529                                         done(ep0, req, 0);
1530                         }
1531                 } else if (stat & UDC_STALL) {
1532                         UDC_CTRL_REG = UDC_CLR_HALT;
1533                         UDC_EP_NUM_REG = 0;
1534                 } else {
1535                         UDC_EP_NUM_REG = 0;
1536                 }
1537         }
1538
1539         /* SETUP starts all control transfers */
1540         if (irq_src & UDC_SETUP) {
1541                 union u {
1542                         u16                     word[4];
1543                         struct usb_ctrlrequest  r;
1544                 } u;
1545                 int                     status = -EINVAL;
1546                 struct omap_ep          *ep;
1547
1548                 /* read the (latest) SETUP message */
1549                 do {
1550                         UDC_EP_NUM_REG = UDC_SETUP_SEL;
1551                         /* two bytes at a time */
1552                         u.word[0] = UDC_DATA_REG;
1553                         u.word[1] = UDC_DATA_REG;
1554                         u.word[2] = UDC_DATA_REG;
1555                         u.word[3] = UDC_DATA_REG;
1556                         UDC_EP_NUM_REG = 0;
1557                 } while (UDC_IRQ_SRC_REG & UDC_SETUP);
1558
1559 #define w_value         le16_to_cpup (&u.r.wValue)
1560 #define w_index         le16_to_cpup (&u.r.wIndex)
1561 #define w_length        le16_to_cpup (&u.r.wLength)
1562
1563                 /* Delegate almost all control requests to the gadget driver,
1564                  * except for a handful of ch9 status/feature requests that
1565                  * hardware doesn't autodecode _and_ the gadget API hides.
1566                  */
1567                 udc->ep0_in = (u.r.bRequestType & USB_DIR_IN) != 0;
1568                 udc->ep0_set_config = 0;
1569                 udc->ep0_pending = 1;
1570                 ep0->stopped = 0;
1571                 ep0->ackwait = 0;
1572                 switch (u.r.bRequest) {
1573                 case USB_REQ_SET_CONFIGURATION:
1574                         /* udc needs to know when ep != 0 is valid */
1575                         if (u.r.bRequestType != USB_RECIP_DEVICE)
1576                                 goto delegate;
1577                         if (w_length != 0)
1578                                 goto do_stall;
1579                         udc->ep0_set_config = 1;
1580                         udc->ep0_reset_config = (w_value == 0);
1581                         VDBG("set config %d\n", w_value);
1582
1583                         /* update udc NOW since gadget driver may start
1584                          * queueing requests immediately; clear config
1585                          * later if it fails the request.
1586                          */
1587                         if (udc->ep0_reset_config)
1588                                 UDC_SYSCON2_REG = UDC_CLR_CFG;
1589                         else
1590                                 UDC_SYSCON2_REG = UDC_DEV_CFG;
1591                         update_otg(udc);
1592                         goto delegate;
1593                 case USB_REQ_CLEAR_FEATURE:
1594                         /* clear endpoint halt */
1595                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
1596                                 goto delegate;
1597                         if (w_value != USB_ENDPOINT_HALT
1598                                         || w_length != 0)
1599                                 goto do_stall;
1600                         ep = &udc->ep[w_index & 0xf];
1601                         if (ep != ep0) {
1602                                 if (w_index & USB_DIR_IN)
1603                                         ep += 16;
1604                                 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
1605                                                 || !ep->desc)
1606                                         goto do_stall;
1607                                 use_ep(ep, 0);
1608                                 UDC_CTRL_REG = udc->clr_halt;
1609                                 ep->ackwait = 0;
1610                                 if (!(ep->bEndpointAddress & USB_DIR_IN)) {
1611                                         UDC_CTRL_REG = UDC_SET_FIFO_EN;
1612                                         ep->ackwait = 1 + ep->double_buf;
1613                                 }
1614                                 /* NOTE:  assumes the host behaves sanely,
1615                                  * only clearing real halts.  Else we may
1616                                  * need to kill pending transfers and then
1617                                  * restart the queue... very messy for DMA!
1618                                  */
1619                         }
1620                         VDBG("%s halt cleared by host\n", ep->name);
1621                         goto ep0out_status_stage;
1622                 case USB_REQ_SET_FEATURE:
1623                         /* set endpoint halt */
1624                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
1625                                 goto delegate;
1626                         if (w_value != USB_ENDPOINT_HALT
1627                                         || w_length != 0)
1628                                 goto do_stall;
1629                         ep = &udc->ep[w_index & 0xf];
1630                         if (w_index & USB_DIR_IN)
1631                                 ep += 16;
1632                         if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
1633                                         || ep == ep0 || !ep->desc)
1634                                 goto do_stall;
1635                         if (use_dma && ep->has_dma) {
1636                                 /* this has rude side-effects (aborts) and
1637                                  * can't really work if DMA-IN is active
1638                                  */
1639                                 DBG("%s host set_halt, NYET \n", ep->name);
1640                                 goto do_stall;
1641                         }
1642                         use_ep(ep, 0);
1643                         /* can't halt if fifo isn't empty... */
1644                         UDC_CTRL_REG = UDC_CLR_EP;
1645                         UDC_CTRL_REG = UDC_SET_HALT;
1646                         VDBG("%s halted by host\n", ep->name);
1647 ep0out_status_stage:
1648                         status = 0;
1649                         UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
1650                         UDC_CTRL_REG = UDC_CLR_EP;
1651                         UDC_CTRL_REG = UDC_SET_FIFO_EN;
1652                         UDC_EP_NUM_REG = UDC_EP_DIR;
1653                         udc->ep0_pending = 0;
1654                         break;
1655                 case USB_REQ_GET_STATUS:
1656                         /* return interface status.  if we were pedantic,
1657                          * we'd detect non-existent interfaces, and stall.
1658                          */
1659                         if (u.r.bRequestType
1660                                         != (USB_DIR_IN|USB_RECIP_INTERFACE))
1661                                 goto delegate;
1662                         /* return two zero bytes */
1663                         UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
1664                         UDC_DATA_REG = 0;
1665                         UDC_CTRL_REG = UDC_SET_FIFO_EN;
1666                         UDC_EP_NUM_REG = UDC_EP_DIR;
1667                         status = 0;
1668                         VDBG("GET_STATUS, interface %d\n", w_index);
1669                         /* next, status stage */
1670                         break;
1671                 default:
1672 delegate:
1673                         /* activate the ep0out fifo right away */
1674                         if (!udc->ep0_in && w_length) {
1675                                 UDC_EP_NUM_REG = 0;
1676                                 UDC_CTRL_REG = UDC_SET_FIFO_EN;
1677                         }
1678
1679                         /* gadget drivers see class/vendor specific requests,
1680                          * {SET,GET}_{INTERFACE,DESCRIPTOR,CONFIGURATION},
1681                          * and more
1682                          */
1683                         VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1684                                 u.r.bRequestType, u.r.bRequest,
1685                                 w_value, w_index, w_length);
1686
1687 #undef  w_value
1688 #undef  w_index
1689 #undef  w_length
1690
1691                         /* The gadget driver may return an error here,
1692                          * causing an immediate protocol stall.
1693                          *
1694                          * Else it must issue a response, either queueing a
1695                          * response buffer for the DATA stage, or halting ep0
1696                          * (causing a protocol stall, not a real halt).  A
1697                          * zero length buffer means no DATA stage.
1698                          *
1699                          * It's fine to issue that response after the setup()
1700                          * call returns, and this IRQ was handled.
1701                          */
1702                         udc->ep0_setup = 1;
1703                         spin_unlock(&udc->lock);
1704                         status = udc->driver->setup (&udc->gadget, &u.r);
1705                         spin_lock(&udc->lock);
1706                         udc->ep0_setup = 0;
1707                 }
1708
1709                 if (status < 0) {
1710 do_stall:
1711                         VDBG("req %02x.%02x protocol STALL; stat %d\n",
1712                                         u.r.bRequestType, u.r.bRequest, status);
1713                         if (udc->ep0_set_config) {
1714                                 if (udc->ep0_reset_config)
1715                                         WARN("error resetting config?\n");
1716                                 else
1717                                         UDC_SYSCON2_REG = UDC_CLR_CFG;
1718                         }
1719                         UDC_SYSCON2_REG = UDC_STALL_CMD;
1720                         udc->ep0_pending = 0;
1721                 }
1722         }
1723 }
1724
1725 /*-------------------------------------------------------------------------*/
1726
1727 #define OTG_FLAGS (UDC_B_HNP_ENABLE|UDC_A_HNP_SUPPORT|UDC_A_ALT_HNP_SUPPORT)
1728
1729 static void devstate_irq(struct omap_udc *udc, u16 irq_src)
1730 {
1731         u16     devstat, change;
1732
1733         devstat = UDC_DEVSTAT_REG;
1734         change = devstat ^ udc->devstat;
1735         udc->devstat = devstat;
1736
1737         if (change & (UDC_USB_RESET|UDC_ATT)) {
1738                 udc_quiesce(udc);
1739
1740                 if (change & UDC_ATT) {
1741                         /* driver for any external transceiver will
1742                          * have called omap_vbus_session() already
1743                          */
1744                         if (devstat & UDC_ATT) {
1745                                 udc->gadget.speed = USB_SPEED_FULL;
1746                                 VDBG("connect\n");
1747                                 if (!udc->transceiver)
1748                                         pullup_enable(udc);
1749                                 // if (driver->connect) call it
1750                         } else if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
1751                                 udc->gadget.speed = USB_SPEED_UNKNOWN;
1752                                 if (!udc->transceiver)
1753                                         pullup_disable(udc);
1754                                 DBG("disconnect, gadget %s\n",
1755                                         udc->driver->driver.name);
1756                                 if (udc->driver->disconnect) {
1757                                         spin_unlock(&udc->lock);
1758                                         udc->driver->disconnect(&udc->gadget);
1759                                         spin_lock(&udc->lock);
1760                                 }
1761                         }
1762                         change &= ~UDC_ATT;
1763                 }
1764
1765                 if (change & UDC_USB_RESET) {
1766                         if (devstat & UDC_USB_RESET) {
1767                                 VDBG("RESET=1\n");
1768                         } else {
1769                                 udc->gadget.speed = USB_SPEED_FULL;
1770                                 INFO("USB reset done, gadget %s\n",
1771                                         udc->driver->driver.name);
1772                                 /* ep0 traffic is legal from now on */
1773                                 UDC_IRQ_EN_REG = UDC_DS_CHG_IE | UDC_EP0_IE;
1774                         }
1775                         change &= ~UDC_USB_RESET;
1776                 }
1777         }
1778         if (change & UDC_SUS) {
1779                 if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
1780                         // FIXME tell isp1301 to suspend/resume (?)
1781                         if (devstat & UDC_SUS) {
1782                                 VDBG("suspend\n");
1783                                 update_otg(udc);
1784                                 /* HNP could be under way already */
1785                                 if (udc->gadget.speed == USB_SPEED_FULL
1786                                                 && udc->driver->suspend) {
1787                                         spin_unlock(&udc->lock);
1788                                         udc->driver->suspend(&udc->gadget);
1789                                         spin_lock(&udc->lock);
1790                                 }
1791                                 if (udc->transceiver)
1792                                         otg_set_suspend(udc->transceiver, 1);
1793                         } else {
1794                                 VDBG("resume\n");
1795                                 if (udc->transceiver)
1796                                         otg_set_suspend(udc->transceiver, 0);
1797                                 if (udc->gadget.speed == USB_SPEED_FULL
1798                                                 && udc->driver->resume) {
1799                                         spin_unlock(&udc->lock);
1800                                         udc->driver->resume(&udc->gadget);
1801                                         spin_lock(&udc->lock);
1802                                 }
1803                         }
1804                 }
1805                 change &= ~UDC_SUS;
1806         }
1807         if (!cpu_is_omap15xx() && (change & OTG_FLAGS)) {
1808                 update_otg(udc);
1809                 change &= ~OTG_FLAGS;
1810         }
1811
1812         change &= ~(UDC_CFG|UDC_DEF|UDC_ADD);
1813         if (change)
1814                 VDBG("devstat %03x, ignore change %03x\n",
1815                         devstat,  change);
1816
1817         UDC_IRQ_SRC_REG = UDC_DS_CHG;
1818 }
1819
1820 static irqreturn_t
1821 omap_udc_irq(int irq, void *_udc, struct pt_regs *r)
1822 {
1823         struct omap_udc *udc = _udc;
1824         u16             irq_src;
1825         irqreturn_t     status = IRQ_NONE;
1826         unsigned long   flags;
1827
1828         spin_lock_irqsave(&udc->lock, flags);
1829         irq_src = UDC_IRQ_SRC_REG;
1830
1831         /* Device state change (usb ch9 stuff) */
1832         if (irq_src & UDC_DS_CHG) {
1833                 devstate_irq(_udc, irq_src);
1834                 status = IRQ_HANDLED;
1835                 irq_src &= ~UDC_DS_CHG;
1836         }
1837
1838         /* EP0 control transfers */
1839         if (irq_src & (UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX)) {
1840                 ep0_irq(_udc, irq_src);
1841                 status = IRQ_HANDLED;
1842                 irq_src &= ~(UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX);
1843         }
1844
1845         /* DMA transfer completion */
1846         if (use_dma && (irq_src & (UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT))) {
1847                 dma_irq(_udc, irq_src);
1848                 status = IRQ_HANDLED;
1849                 irq_src &= ~(UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT);
1850         }
1851
1852         irq_src &= ~(UDC_SOF|UDC_EPN_TX|UDC_EPN_RX);
1853         if (irq_src)
1854                 DBG("udc_irq, unhandled %03x\n", irq_src);
1855         spin_unlock_irqrestore(&udc->lock, flags);
1856
1857         return status;
1858 }
1859
1860 /* workaround for seemingly-lost IRQs for RX ACKs... */
1861 #define PIO_OUT_TIMEOUT (jiffies + HZ/3)
1862 #define HALF_FULL(f)    (!((f)&(UDC_NON_ISO_FIFO_FULL|UDC_NON_ISO_FIFO_EMPTY)))
1863
1864 static void pio_out_timer(unsigned long _ep)
1865 {
1866         struct omap_ep  *ep = (void *) _ep;
1867         unsigned long   flags;
1868         u16             stat_flg;
1869
1870         spin_lock_irqsave(&ep->udc->lock, flags);
1871         if (!list_empty(&ep->queue) && ep->ackwait) {
1872                 use_ep(ep, 0);
1873                 stat_flg = UDC_STAT_FLG_REG;
1874
1875                 if ((stat_flg & UDC_ACK) && (!(stat_flg & UDC_FIFO_EN)
1876                                 || (ep->double_buf && HALF_FULL(stat_flg)))) {
1877                         struct omap_req *req;
1878
1879                         VDBG("%s: lose, %04x\n", ep->ep.name, stat_flg);
1880                         req = container_of(ep->queue.next,
1881                                         struct omap_req, queue);
1882                         UDC_EP_NUM_REG = ep->bEndpointAddress | UDC_EP_SEL;
1883                         (void) read_fifo(ep, req);
1884                         UDC_EP_NUM_REG = ep->bEndpointAddress;
1885                         UDC_CTRL_REG = UDC_SET_FIFO_EN;
1886                         ep->ackwait = 1 + ep->double_buf;
1887                 }
1888         }
1889         mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
1890         spin_unlock_irqrestore(&ep->udc->lock, flags);
1891 }
1892
1893 static irqreturn_t
1894 omap_udc_pio_irq(int irq, void *_dev, struct pt_regs *r)
1895 {
1896         u16             epn_stat, irq_src;
1897         irqreturn_t     status = IRQ_NONE;
1898         struct omap_ep  *ep;
1899         int             epnum;
1900         struct omap_udc *udc = _dev;
1901         struct omap_req *req;
1902         unsigned long   flags;
1903
1904         spin_lock_irqsave(&udc->lock, flags);
1905         epn_stat = UDC_EPN_STAT_REG;
1906         irq_src = UDC_IRQ_SRC_REG;
1907
1908         /* handle OUT first, to avoid some wasteful NAKs */
1909         if (irq_src & UDC_EPN_RX) {
1910                 epnum = (epn_stat >> 8) & 0x0f;
1911                 UDC_IRQ_SRC_REG = UDC_EPN_RX;
1912                 status = IRQ_HANDLED;
1913                 ep = &udc->ep[epnum];
1914                 ep->irqs++;
1915
1916                 UDC_EP_NUM_REG = epnum | UDC_EP_SEL;
1917                 ep->fnf = 0;
1918                 if ((UDC_STAT_FLG_REG & UDC_ACK)) {
1919                         ep->ackwait--;
1920                         if (!list_empty(&ep->queue)) {
1921                                 int stat;
1922                                 req = container_of(ep->queue.next,
1923                                                 struct omap_req, queue);
1924                                 stat = read_fifo(ep, req);
1925                                 if (!ep->double_buf)
1926                                         ep->fnf = 1;
1927                         }
1928                 }
1929                 /* min 6 clock delay before clearing EP_SEL ... */
1930                 epn_stat = UDC_EPN_STAT_REG;
1931                 epn_stat = UDC_EPN_STAT_REG;
1932                 UDC_EP_NUM_REG = epnum;
1933
1934                 /* enabling fifo _after_ clearing ACK, contrary to docs,
1935                  * reduces lossage; timer still needed though (sigh).
1936                  */
1937                 if (ep->fnf) {
1938                         UDC_CTRL_REG = UDC_SET_FIFO_EN;
1939                         ep->ackwait = 1 + ep->double_buf;
1940                 }
1941                 mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
1942         }
1943
1944         /* then IN transfers */
1945         else if (irq_src & UDC_EPN_TX) {
1946                 epnum = epn_stat & 0x0f;
1947                 UDC_IRQ_SRC_REG = UDC_EPN_TX;
1948                 status = IRQ_HANDLED;
1949                 ep = &udc->ep[16 + epnum];
1950                 ep->irqs++;
1951
1952                 UDC_EP_NUM_REG = epnum | UDC_EP_DIR | UDC_EP_SEL;
1953                 if ((UDC_STAT_FLG_REG & UDC_ACK)) {
1954                         ep->ackwait = 0;
1955                         if (!list_empty(&ep->queue)) {
1956                                 req = container_of(ep->queue.next,
1957                                                 struct omap_req, queue);
1958                                 (void) write_fifo(ep, req);
1959                         }
1960                 }
1961                 /* min 6 clock delay before clearing EP_SEL ... */
1962                 epn_stat = UDC_EPN_STAT_REG;
1963                 epn_stat = UDC_EPN_STAT_REG;
1964                 UDC_EP_NUM_REG = epnum | UDC_EP_DIR;
1965                 /* then 6 clocks before it'd tx */
1966         }
1967
1968         spin_unlock_irqrestore(&udc->lock, flags);
1969         return status;
1970 }
1971
1972 #ifdef  USE_ISO
1973 static irqreturn_t
1974 omap_udc_iso_irq(int irq, void *_dev, struct pt_regs *r)
1975 {
1976         struct omap_udc *udc = _dev;
1977         struct omap_ep  *ep;
1978         int             pending = 0;
1979         unsigned long   flags;
1980
1981         spin_lock_irqsave(&udc->lock, flags);
1982
1983         /* handle all non-DMA ISO transfers */
1984         list_for_each_entry (ep, &udc->iso, iso) {
1985                 u16             stat;
1986                 struct omap_req *req;
1987
1988                 if (ep->has_dma || list_empty(&ep->queue))
1989                         continue;
1990                 req = list_entry(ep->queue.next, struct omap_req, queue);
1991
1992                 use_ep(ep, UDC_EP_SEL);
1993                 stat = UDC_STAT_FLG_REG;
1994
1995                 /* NOTE: like the other controller drivers, this isn't
1996                  * currently reporting lost or damaged frames.
1997                  */
1998                 if (ep->bEndpointAddress & USB_DIR_IN) {
1999                         if (stat & UDC_MISS_IN)
2000                                 /* done(ep, req, -EPROTO) */;
2001                         else
2002                                 write_fifo(ep, req);
2003                 } else {
2004                         int     status = 0;
2005
2006                         if (stat & UDC_NO_RXPACKET)
2007                                 status = -EREMOTEIO;
2008                         else if (stat & UDC_ISO_ERR)
2009                                 status = -EILSEQ;
2010                         else if (stat & UDC_DATA_FLUSH)
2011                                 status = -ENOSR;
2012
2013                         if (status)
2014                                 /* done(ep, req, status) */;
2015                         else
2016                                 read_fifo(ep, req);
2017                 }
2018                 deselect_ep();
2019                 /* 6 wait states before next EP */
2020
2021                 ep->irqs++;
2022                 if (!list_empty(&ep->queue))
2023                         pending = 1;
2024         }
2025         if (!pending)
2026                 UDC_IRQ_EN_REG &= ~UDC_SOF_IE;
2027         UDC_IRQ_SRC_REG = UDC_SOF;
2028
2029         spin_unlock_irqrestore(&udc->lock, flags);
2030         return IRQ_HANDLED;
2031 }
2032 #endif
2033
2034 /*-------------------------------------------------------------------------*/
2035
2036 static struct omap_udc *udc;
2037
2038 int usb_gadget_register_driver (struct usb_gadget_driver *driver)
2039 {
2040         int             status = -ENODEV;
2041         struct omap_ep  *ep;
2042         unsigned long   flags;
2043
2044         /* basic sanity tests */
2045         if (!udc)
2046                 return -ENODEV;
2047         if (!driver
2048                         // FIXME if otg, check:  driver->is_otg
2049                         || driver->speed < USB_SPEED_FULL
2050                         || !driver->bind
2051                         || !driver->unbind
2052                         || !driver->setup)
2053                 return -EINVAL;
2054
2055         spin_lock_irqsave(&udc->lock, flags);
2056         if (udc->driver) {
2057                 spin_unlock_irqrestore(&udc->lock, flags);
2058                 return -EBUSY;
2059         }
2060
2061         /* reset state */
2062         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
2063                 ep->irqs = 0;
2064                 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
2065                         continue;
2066                 use_ep(ep, 0);
2067                 UDC_CTRL_REG = UDC_SET_HALT;
2068         }
2069         udc->ep0_pending = 0;
2070         udc->ep[0].irqs = 0;
2071         udc->softconnect = 1;
2072
2073         /* hook up the driver */
2074         driver->driver.bus = NULL;
2075         udc->driver = driver;
2076         udc->gadget.dev.driver = &driver->driver;
2077         spin_unlock_irqrestore(&udc->lock, flags);
2078
2079         status = driver->bind (&udc->gadget);
2080         if (status) {
2081                 DBG("bind to %s --> %d\n", driver->driver.name, status);
2082                 udc->gadget.dev.driver = NULL;
2083                 udc->driver = NULL;
2084                 goto done;
2085         }
2086         DBG("bound to driver %s\n", driver->driver.name);
2087
2088         UDC_IRQ_SRC_REG = UDC_IRQ_SRC_MASK;
2089
2090         /* connect to bus through transceiver */
2091         if (udc->transceiver) {
2092                 status = otg_set_peripheral(udc->transceiver, &udc->gadget);
2093                 if (status < 0) {
2094                         ERR("can't bind to transceiver\n");
2095                         driver->unbind (&udc->gadget);
2096                         udc->gadget.dev.driver = NULL;
2097                         udc->driver = NULL;
2098                         goto done;
2099                 }
2100         } else {
2101                 if (can_pullup(udc))
2102                         pullup_enable (udc);
2103                 else
2104                         pullup_disable (udc);
2105         }
2106
2107         /* boards that don't have VBUS sensing can't autogate 48MHz;
2108          * can't enter deep sleep while a gadget driver is active.
2109          */
2110         if (machine_is_omap_innovator() || machine_is_omap_osk())
2111                 omap_vbus_session(&udc->gadget, 1);
2112
2113 done:
2114         return status;
2115 }
2116 EXPORT_SYMBOL(usb_gadget_register_driver);
2117
2118 int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
2119 {
2120         unsigned long   flags;
2121         int             status = -ENODEV;
2122
2123         if (!udc)
2124                 return -ENODEV;
2125         if (!driver || driver != udc->driver)
2126                 return -EINVAL;
2127
2128         if (machine_is_omap_innovator() || machine_is_omap_osk())
2129                 omap_vbus_session(&udc->gadget, 0);
2130
2131         if (udc->transceiver)
2132                 (void) otg_set_peripheral(udc->transceiver, NULL);
2133         else
2134                 pullup_disable(udc);
2135
2136         spin_lock_irqsave(&udc->lock, flags);
2137         udc_quiesce(udc);
2138         spin_unlock_irqrestore(&udc->lock, flags);
2139
2140         driver->unbind(&udc->gadget);
2141         udc->gadget.dev.driver = NULL;
2142         udc->driver = NULL;
2143
2144         DBG("unregistered driver '%s'\n", driver->driver.name);
2145         return status;
2146 }
2147 EXPORT_SYMBOL(usb_gadget_unregister_driver);
2148
2149
2150 /*-------------------------------------------------------------------------*/
2151
2152 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
2153
2154 #include <linux/seq_file.h>
2155
2156 static const char proc_filename[] = "driver/udc";
2157
2158 #define FOURBITS "%s%s%s%s"
2159 #define EIGHTBITS FOURBITS FOURBITS
2160
2161 static void proc_ep_show(struct seq_file *s, struct omap_ep *ep)
2162 {
2163         u16             stat_flg;
2164         struct omap_req *req;
2165         char            buf[20];
2166
2167         use_ep(ep, 0);
2168
2169         if (use_dma && ep->has_dma)
2170                 snprintf(buf, sizeof buf, "(%cxdma%d lch%d) ",
2171                         (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
2172                         ep->dma_channel - 1, ep->lch);
2173         else
2174                 buf[0] = 0;
2175
2176         stat_flg = UDC_STAT_FLG_REG;
2177         seq_printf(s,
2178                 "\n%s %s%s%sirqs %ld stat %04x " EIGHTBITS FOURBITS "%s\n",
2179                 ep->name, buf,
2180                 ep->double_buf ? "dbuf " : "",
2181                 ({char *s; switch(ep->ackwait){
2182                 case 0: s = ""; break;
2183                 case 1: s = "(ackw) "; break;
2184                 case 2: s = "(ackw2) "; break;
2185                 default: s = "(?) "; break;
2186                 } s;}),
2187                 ep->irqs, stat_flg,
2188                 (stat_flg & UDC_NO_RXPACKET) ? "no_rxpacket " : "",
2189                 (stat_flg & UDC_MISS_IN) ? "miss_in " : "",
2190                 (stat_flg & UDC_DATA_FLUSH) ? "data_flush " : "",
2191                 (stat_flg & UDC_ISO_ERR) ? "iso_err " : "",
2192                 (stat_flg & UDC_ISO_FIFO_EMPTY) ? "iso_fifo_empty " : "",
2193                 (stat_flg & UDC_ISO_FIFO_FULL) ? "iso_fifo_full " : "",
2194                 (stat_flg & UDC_EP_HALTED) ? "HALT " : "",
2195                 (stat_flg & UDC_STALL) ? "STALL " : "",
2196                 (stat_flg & UDC_NAK) ? "NAK " : "",
2197                 (stat_flg & UDC_ACK) ? "ACK " : "",
2198                 (stat_flg & UDC_FIFO_EN) ? "fifo_en " : "",
2199                 (stat_flg & UDC_NON_ISO_FIFO_EMPTY) ? "fifo_empty " : "",
2200                 (stat_flg & UDC_NON_ISO_FIFO_FULL) ? "fifo_full " : "");
2201
2202         if (list_empty (&ep->queue))
2203                 seq_printf(s, "\t(queue empty)\n");
2204         else
2205                 list_for_each_entry (req, &ep->queue, queue) {
2206                         unsigned        length = req->req.actual;
2207
2208                         if (use_dma && buf[0]) {
2209                                 length += ((ep->bEndpointAddress & USB_DIR_IN)
2210                                                 ? dma_src_len : dma_dest_len)
2211                                         (ep, req->req.dma + length);
2212                                 buf[0] = 0;
2213                         }
2214                         seq_printf(s, "\treq %p len %d/%d buf %p\n",
2215                                         &req->req, length,
2216                                         req->req.length, req->req.buf);
2217                 }
2218 }
2219
2220 static char *trx_mode(unsigned m, int enabled)
2221 {
2222         switch (m) {
2223         case 0:         return enabled ? "*6wire" : "unused";
2224         case 1:         return "4wire";
2225         case 2:         return "3wire";
2226         case 3:         return "6wire";
2227         default:        return "unknown";
2228         }
2229 }
2230
2231 static int proc_otg_show(struct seq_file *s)
2232 {
2233         u32             tmp;
2234         u32             trans;
2235
2236         tmp = OTG_REV_REG;
2237         trans = USB_TRANSCEIVER_CTRL_REG;
2238         seq_printf(s, "\nOTG rev %d.%d, transceiver_ctrl %05x\n",
2239                 tmp >> 4, tmp & 0xf, trans);
2240         tmp = OTG_SYSCON_1_REG;
2241         seq_printf(s, "otg_syscon1 %08x usb2 %s, usb1 %s, usb0 %s,"
2242                         FOURBITS "\n", tmp,
2243                 trx_mode(USB2_TRX_MODE(tmp), trans & CONF_USB2_UNI_R),
2244                 trx_mode(USB1_TRX_MODE(tmp), trans & CONF_USB1_UNI_R),
2245                 (USB0_TRX_MODE(tmp) == 0 && !cpu_is_omap1710())
2246                         ? "internal"
2247                         : trx_mode(USB0_TRX_MODE(tmp), 1),
2248                 (tmp & OTG_IDLE_EN) ? " !otg" : "",
2249                 (tmp & HST_IDLE_EN) ? " !host" : "",
2250                 (tmp & DEV_IDLE_EN) ? " !dev" : "",
2251                 (tmp & OTG_RESET_DONE) ? " reset_done" : " reset_active");
2252         tmp = OTG_SYSCON_2_REG;
2253         seq_printf(s, "otg_syscon2 %08x%s" EIGHTBITS
2254                         " b_ase_brst=%d hmc=%d\n", tmp,
2255                 (tmp & OTG_EN) ? " otg_en" : "",
2256                 (tmp & USBX_SYNCHRO) ? " synchro" : "",
2257                 // much more SRP stuff
2258                 (tmp & SRP_DATA) ? " srp_data" : "",
2259                 (tmp & SRP_VBUS) ? " srp_vbus" : "",
2260                 (tmp & OTG_PADEN) ? " otg_paden" : "",
2261                 (tmp & HMC_PADEN) ? " hmc_paden" : "",
2262                 (tmp & UHOST_EN) ? " uhost_en" : "",
2263                 (tmp & HMC_TLLSPEED) ? " tllspeed" : "",
2264                 (tmp & HMC_TLLATTACH) ? " tllattach" : "",
2265                 B_ASE_BRST(tmp),
2266                 OTG_HMC(tmp));
2267         tmp = OTG_CTRL_REG;
2268         seq_printf(s, "otg_ctrl    %06x" EIGHTBITS EIGHTBITS "%s\n", tmp,
2269                 (tmp & OTG_ASESSVLD) ? " asess" : "",
2270                 (tmp & OTG_BSESSEND) ? " bsess_end" : "",
2271                 (tmp & OTG_BSESSVLD) ? " bsess" : "",
2272                 (tmp & OTG_VBUSVLD) ? " vbus" : "",
2273                 (tmp & OTG_ID) ? " id" : "",
2274                 (tmp & OTG_DRIVER_SEL) ? " DEVICE" : " HOST",
2275                 (tmp & OTG_A_SETB_HNPEN) ? " a_setb_hnpen" : "",
2276                 (tmp & OTG_A_BUSREQ) ? " a_bus" : "",
2277                 (tmp & OTG_B_HNPEN) ? " b_hnpen" : "",
2278                 (tmp & OTG_B_BUSREQ) ? " b_bus" : "",
2279                 (tmp & OTG_BUSDROP) ? " busdrop" : "",
2280                 (tmp & OTG_PULLDOWN) ? " down" : "",
2281                 (tmp & OTG_PULLUP) ? " up" : "",
2282                 (tmp & OTG_DRV_VBUS) ? " drv" : "",
2283                 (tmp & OTG_PD_VBUS) ? " pd_vb" : "",
2284                 (tmp & OTG_PU_VBUS) ? " pu_vb" : "",
2285                 (tmp & OTG_PU_ID) ? " pu_id" : ""
2286                 );
2287         tmp = OTG_IRQ_EN_REG;
2288         seq_printf(s, "otg_irq_en  %04x" "\n", tmp);
2289         tmp = OTG_IRQ_SRC_REG;
2290         seq_printf(s, "otg_irq_src %04x" "\n", tmp);
2291         tmp = OTG_OUTCTRL_REG;
2292         seq_printf(s, "otg_outctrl %04x" "\n", tmp);
2293         tmp = OTG_TEST_REG;
2294         seq_printf(s, "otg_test    %04x" "\n", tmp);
2295         return 0;
2296 }
2297
2298 static int proc_udc_show(struct seq_file *s, void *_)
2299 {
2300         u32             tmp;
2301         struct omap_ep  *ep;
2302         unsigned long   flags;
2303
2304         spin_lock_irqsave(&udc->lock, flags);
2305
2306         seq_printf(s, "%s, version: " DRIVER_VERSION
2307 #ifdef  USE_ISO
2308                 " (iso)"
2309 #endif
2310                 "%s\n",
2311                 driver_desc,
2312                 use_dma ?  " (dma)" : "");
2313
2314         tmp = UDC_REV_REG & 0xff;
2315         seq_printf(s,
2316                 "UDC rev %d.%d, fifo mode %d, gadget %s\n"
2317                 "hmc %d, transceiver %s\n",
2318                 tmp >> 4, tmp & 0xf,
2319                 fifo_mode,
2320                 udc->driver ? udc->driver->driver.name : "(none)",
2321                 HMC,
2322                 udc->transceiver ? udc->transceiver->label : "(none)");
2323         seq_printf(s, "ULPD control %04x req %04x status %04x\n",
2324                 __REG16(ULPD_CLOCK_CTRL),
2325                 __REG16(ULPD_SOFT_REQ),
2326                 __REG16(ULPD_STATUS_REQ));
2327
2328         /* OTG controller registers */
2329         if (!cpu_is_omap15xx())
2330                 proc_otg_show(s);
2331
2332         tmp = UDC_SYSCON1_REG;
2333         seq_printf(s, "\nsyscon1     %04x" EIGHTBITS "\n", tmp,
2334                 (tmp & UDC_CFG_LOCK) ? " cfg_lock" : "",
2335                 (tmp & UDC_DATA_ENDIAN) ? " data_endian" : "",
2336                 (tmp & UDC_DMA_ENDIAN) ? " dma_endian" : "",
2337                 (tmp & UDC_NAK_EN) ? " nak" : "",
2338                 (tmp & UDC_AUTODECODE_DIS) ? " autodecode_dis" : "",
2339                 (tmp & UDC_SELF_PWR) ? " self_pwr" : "",
2340                 (tmp & UDC_SOFF_DIS) ? " soff_dis" : "",
2341                 (tmp & UDC_PULLUP_EN) ? " PULLUP" : "");
2342         // syscon2 is write-only
2343
2344         /* UDC controller registers */
2345         if (!(tmp & UDC_PULLUP_EN)) {
2346                 seq_printf(s, "(suspended)\n");
2347                 spin_unlock_irqrestore(&udc->lock, flags);
2348                 return 0;
2349         }
2350
2351         tmp = UDC_DEVSTAT_REG;
2352         seq_printf(s, "devstat     %04x" EIGHTBITS "%s%s\n", tmp,
2353                 (tmp & UDC_B_HNP_ENABLE) ? " b_hnp" : "",
2354                 (tmp & UDC_A_HNP_SUPPORT) ? " a_hnp" : "",
2355                 (tmp & UDC_A_ALT_HNP_SUPPORT) ? " a_alt_hnp" : "",
2356                 (tmp & UDC_R_WK_OK) ? " r_wk_ok" : "",
2357                 (tmp & UDC_USB_RESET) ? " usb_reset" : "",
2358                 (tmp & UDC_SUS) ? " SUS" : "",
2359                 (tmp & UDC_CFG) ? " CFG" : "",
2360                 (tmp & UDC_ADD) ? " ADD" : "",
2361                 (tmp & UDC_DEF) ? " DEF" : "",
2362                 (tmp & UDC_ATT) ? " ATT" : "");
2363         seq_printf(s, "sof         %04x\n", UDC_SOF_REG);
2364         tmp = UDC_IRQ_EN_REG;
2365         seq_printf(s, "irq_en      %04x" FOURBITS "%s\n", tmp,
2366                 (tmp & UDC_SOF_IE) ? " sof" : "",
2367                 (tmp & UDC_EPN_RX_IE) ? " epn_rx" : "",
2368                 (tmp & UDC_EPN_TX_IE) ? " epn_tx" : "",
2369                 (tmp & UDC_DS_CHG_IE) ? " ds_chg" : "",
2370                 (tmp & UDC_EP0_IE) ? " ep0" : "");
2371         tmp = UDC_IRQ_SRC_REG;
2372         seq_printf(s, "irq_src     %04x" EIGHTBITS "%s%s\n", tmp,
2373                 (tmp & UDC_TXN_DONE) ? " txn_done" : "",
2374                 (tmp & UDC_RXN_CNT) ? " rxn_cnt" : "",
2375                 (tmp & UDC_RXN_EOT) ? " rxn_eot" : "",
2376                 (tmp & UDC_SOF) ? " sof" : "",
2377                 (tmp & UDC_EPN_RX) ? " epn_rx" : "",
2378                 (tmp & UDC_EPN_TX) ? " epn_tx" : "",
2379                 (tmp & UDC_DS_CHG) ? " ds_chg" : "",
2380                 (tmp & UDC_SETUP) ? " setup" : "",
2381                 (tmp & UDC_EP0_RX) ? " ep0out" : "",
2382                 (tmp & UDC_EP0_TX) ? " ep0in" : "");
2383         if (use_dma) {
2384                 unsigned i;
2385
2386                 tmp = UDC_DMA_IRQ_EN_REG;
2387                 seq_printf(s, "dma_irq_en  %04x%s" EIGHTBITS "\n", tmp,
2388                         (tmp & UDC_TX_DONE_IE(3)) ? " tx2_done" : "",
2389                         (tmp & UDC_RX_CNT_IE(3)) ? " rx2_cnt" : "",
2390                         (tmp & UDC_RX_EOT_IE(3)) ? " rx2_eot" : "",
2391
2392                         (tmp & UDC_TX_DONE_IE(2)) ? " tx1_done" : "",
2393                         (tmp & UDC_RX_CNT_IE(2)) ? " rx1_cnt" : "",
2394                         (tmp & UDC_RX_EOT_IE(2)) ? " rx1_eot" : "",
2395
2396                         (tmp & UDC_TX_DONE_IE(1)) ? " tx0_done" : "",
2397                         (tmp & UDC_RX_CNT_IE(1)) ? " rx0_cnt" : "",
2398                         (tmp & UDC_RX_EOT_IE(1)) ? " rx0_eot" : "");
2399
2400                 tmp = UDC_RXDMA_CFG_REG;
2401                 seq_printf(s, "rxdma_cfg   %04x\n", tmp);
2402                 if (tmp) {
2403                         for (i = 0; i < 3; i++) {
2404                                 if ((tmp & (0x0f << (i * 4))) == 0)
2405                                         continue;
2406                                 seq_printf(s, "rxdma[%d]    %04x\n", i,
2407                                                 UDC_RXDMA_REG(i + 1));
2408                         }
2409                 }
2410                 tmp = UDC_TXDMA_CFG_REG;
2411                 seq_printf(s, "txdma_cfg   %04x\n", tmp);
2412                 if (tmp) {
2413                         for (i = 0; i < 3; i++) {
2414                                 if (!(tmp & (0x0f << (i * 4))))
2415                                         continue;
2416                                 seq_printf(s, "txdma[%d]    %04x\n", i,
2417                                                 UDC_TXDMA_REG(i + 1));
2418                         }
2419                 }
2420         }
2421
2422         tmp = UDC_DEVSTAT_REG;
2423         if (tmp & UDC_ATT) {
2424                 proc_ep_show(s, &udc->ep[0]);
2425                 if (tmp & UDC_ADD) {
2426                         list_for_each_entry (ep, &udc->gadget.ep_list,
2427                                         ep.ep_list) {
2428                                 if (ep->desc)
2429                                         proc_ep_show(s, ep);
2430                         }
2431                 }
2432         }
2433         spin_unlock_irqrestore(&udc->lock, flags);
2434         return 0;
2435 }
2436
2437 static int proc_udc_open(struct inode *inode, struct file *file)
2438 {
2439         return single_open(file, proc_udc_show, NULL);
2440 }
2441
2442 static struct file_operations proc_ops = {
2443         .open           = proc_udc_open,
2444         .read           = seq_read,
2445         .llseek         = seq_lseek,
2446         .release        = single_release,
2447 };
2448
2449 static void create_proc_file(void)
2450 {
2451         struct proc_dir_entry *pde;
2452
2453         pde = create_proc_entry (proc_filename, 0, NULL);
2454         if (pde)
2455                 pde->proc_fops = &proc_ops;
2456 }
2457
2458 static void remove_proc_file(void)
2459 {
2460         remove_proc_entry(proc_filename, NULL);
2461 }
2462
2463 #else
2464
2465 static inline void create_proc_file(void) {}
2466 static inline void remove_proc_file(void) {}
2467
2468 #endif
2469
2470 /*-------------------------------------------------------------------------*/
2471
2472 /* Before this controller can enumerate, we need to pick an endpoint
2473  * configuration, or "fifo_mode"  That involves allocating 2KB of packet
2474  * buffer space among the endpoints we'll be operating.
2475  *
2476  * NOTE: as of OMAP 1710 ES2.0, writing a new endpoint config when
2477  * UDC_SYSCON_1_REG.CFG_LOCK is set can now work.  We won't use that
2478  * capability yet though.
2479  */
2480 static unsigned __init
2481 omap_ep_setup(char *name, u8 addr, u8 type,
2482                 unsigned buf, unsigned maxp, int dbuf)
2483 {
2484         struct omap_ep  *ep;
2485         u16             epn_rxtx = 0;
2486
2487         /* OUT endpoints first, then IN */
2488         ep = &udc->ep[addr & 0xf];
2489         if (addr & USB_DIR_IN)
2490                 ep += 16;
2491
2492         /* in case of ep init table bugs */
2493         BUG_ON(ep->name[0]);
2494
2495         /* chip setup ... bit values are same for IN, OUT */
2496         if (type == USB_ENDPOINT_XFER_ISOC) {
2497                 switch (maxp) {
2498                 case 8:         epn_rxtx = 0 << 12; break;
2499                 case 16:        epn_rxtx = 1 << 12; break;
2500                 case 32:        epn_rxtx = 2 << 12; break;
2501                 case 64:        epn_rxtx = 3 << 12; break;
2502                 case 128:       epn_rxtx = 4 << 12; break;
2503                 case 256:       epn_rxtx = 5 << 12; break;
2504                 case 512:       epn_rxtx = 6 << 12; break;
2505                 default:        BUG();
2506                 }
2507                 epn_rxtx |= UDC_EPN_RX_ISO;
2508                 dbuf = 1;
2509         } else {
2510                 /* double-buffering "not supported" on 15xx,
2511                  * and ignored for PIO-IN on 16xx
2512                  */
2513                 if (!use_dma || cpu_is_omap15xx())
2514                         dbuf = 0;
2515
2516                 switch (maxp) {
2517                 case 8:         epn_rxtx = 0 << 12; break;
2518                 case 16:        epn_rxtx = 1 << 12; break;
2519                 case 32:        epn_rxtx = 2 << 12; break;
2520                 case 64:        epn_rxtx = 3 << 12; break;
2521                 default:        BUG();
2522                 }
2523                 if (dbuf && addr)
2524                         epn_rxtx |= UDC_EPN_RX_DB;
2525                 init_timer(&ep->timer);
2526                 ep->timer.function = pio_out_timer;
2527                 ep->timer.data = (unsigned long) ep;
2528         }
2529         if (addr)
2530                 epn_rxtx |= UDC_EPN_RX_VALID;
2531         BUG_ON(buf & 0x07);
2532         epn_rxtx |= buf >> 3;
2533
2534         DBG("%s addr %02x rxtx %04x maxp %d%s buf %d\n",
2535                 name, addr, epn_rxtx, maxp, dbuf ? "x2" : "", buf);
2536
2537         if (addr & USB_DIR_IN)
2538                 UDC_EP_TX_REG(addr & 0xf) = epn_rxtx;
2539         else
2540                 UDC_EP_RX_REG(addr) = epn_rxtx;
2541
2542         /* next endpoint's buffer starts after this one's */
2543         buf += maxp;
2544         if (dbuf)
2545                 buf += maxp;
2546         BUG_ON(buf > 2048);
2547
2548         /* set up driver data structures */
2549         BUG_ON(strlen(name) >= sizeof ep->name);
2550         strlcpy(ep->name, name, sizeof ep->name);
2551         INIT_LIST_HEAD(&ep->queue);
2552         INIT_LIST_HEAD(&ep->iso);
2553         ep->bEndpointAddress = addr;
2554         ep->bmAttributes = type;
2555         ep->double_buf = dbuf;
2556         ep->udc = udc;
2557
2558         ep->ep.name = ep->name;
2559         ep->ep.ops = &omap_ep_ops;
2560         ep->ep.maxpacket = ep->maxpacket = maxp;
2561         list_add_tail (&ep->ep.ep_list, &udc->gadget.ep_list);
2562
2563         return buf;
2564 }
2565
2566 static void omap_udc_release(struct device *dev)
2567 {
2568         complete(udc->done);
2569         kfree (udc);
2570         udc = NULL;
2571 }
2572
2573 static int __init
2574 omap_udc_setup(struct platform_device *odev, struct otg_transceiver *xceiv)
2575 {
2576         unsigned        tmp, buf;
2577
2578         /* abolish any previous hardware state */
2579         UDC_SYSCON1_REG = 0;
2580         UDC_IRQ_EN_REG = 0;
2581         UDC_IRQ_SRC_REG = UDC_IRQ_SRC_MASK;
2582         UDC_DMA_IRQ_EN_REG = 0;
2583         UDC_RXDMA_CFG_REG = 0;
2584         UDC_TXDMA_CFG_REG = 0;
2585
2586         /* UDC_PULLUP_EN gates the chip clock */
2587         // OTG_SYSCON_1_REG |= DEV_IDLE_EN;
2588
2589         udc = kmalloc (sizeof *udc, SLAB_KERNEL);
2590         if (!udc)
2591                 return -ENOMEM;
2592
2593         memset(udc, 0, sizeof *udc);
2594         spin_lock_init (&udc->lock);
2595
2596         udc->gadget.ops = &omap_gadget_ops;
2597         udc->gadget.ep0 = &udc->ep[0].ep;
2598         INIT_LIST_HEAD(&udc->gadget.ep_list);
2599         INIT_LIST_HEAD(&udc->iso);
2600         udc->gadget.speed = USB_SPEED_UNKNOWN;
2601         udc->gadget.name = driver_name;
2602
2603         device_initialize(&udc->gadget.dev);
2604         strcpy (udc->gadget.dev.bus_id, "gadget");
2605         udc->gadget.dev.release = omap_udc_release;
2606         udc->gadget.dev.parent = &odev->dev;
2607         if (use_dma)
2608                 udc->gadget.dev.dma_mask = odev->dev.dma_mask;
2609
2610         udc->transceiver = xceiv;
2611
2612         /* ep0 is special; put it right after the SETUP buffer */
2613         buf = omap_ep_setup("ep0", 0, USB_ENDPOINT_XFER_CONTROL,
2614                         8 /* after SETUP */, 64 /* maxpacket */, 0);
2615         list_del_init(&udc->ep[0].ep.ep_list);
2616
2617         /* initially disable all non-ep0 endpoints */
2618         for (tmp = 1; tmp < 15; tmp++) {
2619                 UDC_EP_RX_REG(tmp) = 0;
2620                 UDC_EP_TX_REG(tmp) = 0;
2621         }
2622
2623 #define OMAP_BULK_EP(name,addr) \
2624         buf = omap_ep_setup(name "-bulk", addr, \
2625                         USB_ENDPOINT_XFER_BULK, buf, 64, 1);
2626 #define OMAP_INT_EP(name,addr, maxp) \
2627         buf = omap_ep_setup(name "-int", addr, \
2628                         USB_ENDPOINT_XFER_INT, buf, maxp, 0);
2629 #define OMAP_ISO_EP(name,addr, maxp) \
2630         buf = omap_ep_setup(name "-iso", addr, \
2631                         USB_ENDPOINT_XFER_ISOC, buf, maxp, 1);
2632
2633         switch (fifo_mode) {
2634         case 0:
2635                 OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
2636                 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2637                 OMAP_INT_EP("ep3in",   USB_DIR_IN  | 3, 16);
2638                 break;
2639         case 1:
2640                 OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
2641                 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2642                 OMAP_INT_EP("ep9in",   USB_DIR_IN  | 9, 16);
2643
2644                 OMAP_BULK_EP("ep3in",  USB_DIR_IN  | 3);
2645                 OMAP_BULK_EP("ep4out", USB_DIR_OUT | 4);
2646                 OMAP_INT_EP("ep10in",  USB_DIR_IN  | 10, 16);
2647
2648                 OMAP_BULK_EP("ep5in",  USB_DIR_IN  | 5);
2649                 OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
2650                 OMAP_INT_EP("ep11in",  USB_DIR_IN  | 11, 16);
2651
2652                 OMAP_BULK_EP("ep6in",  USB_DIR_IN  | 6);
2653                 OMAP_BULK_EP("ep6out", USB_DIR_OUT | 6);
2654                 OMAP_INT_EP("ep12in",  USB_DIR_IN  | 12, 16);
2655
2656                 OMAP_BULK_EP("ep7in",  USB_DIR_IN  | 7);
2657                 OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
2658                 OMAP_INT_EP("ep13in",  USB_DIR_IN  | 13, 16);
2659                 OMAP_INT_EP("ep13out", USB_DIR_OUT | 13, 16);
2660
2661                 OMAP_BULK_EP("ep8in",  USB_DIR_IN  | 8);
2662                 OMAP_BULK_EP("ep8out", USB_DIR_OUT | 8);
2663                 OMAP_INT_EP("ep14in",  USB_DIR_IN  | 14, 16);
2664                 OMAP_INT_EP("ep14out", USB_DIR_OUT | 14, 16);
2665
2666                 OMAP_BULK_EP("ep15in",  USB_DIR_IN  | 15);
2667                 OMAP_BULK_EP("ep15out", USB_DIR_OUT | 15);
2668
2669                 break;
2670
2671 #ifdef  USE_ISO
2672         case 2:                 /* mixed iso/bulk */
2673                 OMAP_ISO_EP("ep1in",   USB_DIR_IN  | 1, 256);
2674                 OMAP_ISO_EP("ep2out",  USB_DIR_OUT | 2, 256);
2675                 OMAP_ISO_EP("ep3in",   USB_DIR_IN  | 3, 128);
2676                 OMAP_ISO_EP("ep4out",  USB_DIR_OUT | 4, 128);
2677
2678                 OMAP_INT_EP("ep5in",   USB_DIR_IN  | 5, 16);
2679
2680                 OMAP_BULK_EP("ep6in",  USB_DIR_IN  | 6);
2681                 OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
2682                 OMAP_INT_EP("ep8in",   USB_DIR_IN  | 8, 16);
2683                 break;
2684         case 3:                 /* mixed bulk/iso */
2685                 OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
2686                 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2687                 OMAP_INT_EP("ep3in",   USB_DIR_IN  | 3, 16);
2688
2689                 OMAP_BULK_EP("ep4in",  USB_DIR_IN  | 4);
2690                 OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
2691                 OMAP_INT_EP("ep6in",   USB_DIR_IN  | 6, 16);
2692
2693                 OMAP_ISO_EP("ep7in",   USB_DIR_IN  | 7, 256);
2694                 OMAP_ISO_EP("ep8out",  USB_DIR_OUT | 8, 256);
2695                 OMAP_INT_EP("ep9in",   USB_DIR_IN  | 9, 16);
2696                 break;
2697 #endif
2698
2699         /* add more modes as needed */
2700
2701         default:
2702                 ERR("unsupported fifo_mode #%d\n", fifo_mode);
2703                 return -ENODEV;
2704         }
2705         UDC_SYSCON1_REG = UDC_CFG_LOCK|UDC_SELF_PWR;
2706         INFO("fifo mode %d, %d bytes not used\n", fifo_mode, 2048 - buf);
2707         return 0;
2708 }
2709
2710 static int __init omap_udc_probe(struct device *dev)
2711 {
2712         struct platform_device  *odev = to_platform_device(dev);
2713         int                     status = -ENODEV;
2714         int                     hmc;
2715         struct otg_transceiver  *xceiv = NULL;
2716         const char              *type = NULL;
2717         struct omap_usb_config  *config = dev->platform_data;
2718
2719         /* NOTE:  "knows" the order of the resources! */
2720         if (!request_mem_region(odev->resource[0].start,
2721                         odev->resource[0].end - odev->resource[0].start + 1,
2722                         driver_name)) {
2723                 DBG("request_mem_region failed\n");
2724                 return -EBUSY;
2725         }
2726
2727         INFO("OMAP UDC rev %d.%d%s\n",
2728                 UDC_REV_REG >> 4, UDC_REV_REG & 0xf,
2729                 config->otg ? ", Mini-AB" : "");
2730
2731         /* use the mode given to us by board init code */
2732         if (cpu_is_omap15xx()) {
2733                 hmc = HMC_1510;
2734                 type = "(unknown)";
2735
2736                 if (machine_is_omap_innovator()) {
2737                         /* just set up software VBUS detect, and then
2738                          * later rig it so we always report VBUS.
2739                          * FIXME without really sensing VBUS, we can't
2740                          * know when to turn PULLUP_EN on/off; and that
2741                          * means we always "need" the 48MHz clock.
2742                          */
2743                         u32 tmp = FUNC_MUX_CTRL_0_REG;
2744
2745                         FUNC_MUX_CTRL_0_REG &= ~VBUS_CTRL_1510;
2746                         tmp |= VBUS_MODE_1510;
2747                         tmp &= ~VBUS_CTRL_1510;
2748                         FUNC_MUX_CTRL_0_REG = tmp;
2749                 }
2750         } else {
2751                 /* The transceiver may package some GPIO logic or handle
2752                  * loopback and/or transceiverless setup; if we find one,
2753                  * use it.  Except for OTG, we don't _need_ to talk to one;
2754                  * but not having one probably means no VBUS detection.
2755                  */
2756                 xceiv = otg_get_transceiver();
2757                 if (xceiv)
2758                         type = xceiv->label;
2759                 else if (config->otg) {
2760                         DBG("OTG requires external transceiver!\n");
2761                         goto cleanup0;
2762                 }
2763
2764                 hmc = HMC_1610;
2765                 switch (hmc) {
2766                 case 0:                 /* POWERUP DEFAULT == 0 */
2767                 case 4:
2768                 case 12:
2769                 case 20:
2770                         if (!cpu_is_omap1710()) {
2771                                 type = "integrated";
2772                                 break;
2773                         }
2774                         /* FALL THROUGH */
2775                 case 3:
2776                 case 11:
2777                 case 16:
2778                 case 19:
2779                 case 25:
2780                         if (!xceiv) {
2781                                 DBG("external transceiver not registered!\n");
2782                                 type = "unknown";
2783                         }
2784                         break;
2785                 case 21:                        /* internal loopback */
2786                         type = "loopback";
2787                         break;
2788                 case 14:                        /* transceiverless */
2789                         if (cpu_is_omap1710())
2790                                 goto bad_on_1710;
2791                         /* FALL THROUGH */
2792                 case 13:
2793                 case 15:
2794                         type = "no";
2795                         break;
2796
2797                 default:
2798 bad_on_1710:
2799                         ERR("unrecognized UDC HMC mode %d\n", hmc);
2800                         goto cleanup0;
2801                 }
2802         }
2803         INFO("hmc mode %d, %s transceiver\n", hmc, type);
2804
2805         /* a "gadget" abstracts/virtualizes the controller */
2806         status = omap_udc_setup(odev, xceiv);
2807         if (status) {
2808                 goto cleanup0;
2809         }
2810         xceiv = NULL;
2811         // "udc" is now valid
2812         pullup_disable(udc);
2813 #if     defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
2814         udc->gadget.is_otg = (config->otg != 0);
2815 #endif
2816
2817         /* starting with omap1710 es2.0, clear toggle is a separate bit */
2818         if (UDC_REV_REG >= 0x61)
2819                 udc->clr_halt = UDC_RESET_EP | UDC_CLRDATA_TOGGLE;
2820         else
2821                 udc->clr_halt = UDC_RESET_EP;
2822
2823         /* USB general purpose IRQ:  ep0, state changes, dma, etc */
2824         status = request_irq(odev->resource[1].start, omap_udc_irq,
2825                         SA_SAMPLE_RANDOM, driver_name, udc);
2826         if (status != 0) {
2827                 ERR( "can't get irq %ld, err %d\n",
2828                         odev->resource[1].start, status);
2829                 goto cleanup1;
2830         }
2831
2832         /* USB "non-iso" IRQ (PIO for all but ep0) */
2833         status = request_irq(odev->resource[2].start, omap_udc_pio_irq,
2834                         SA_SAMPLE_RANDOM, "omap_udc pio", udc);
2835         if (status != 0) {
2836                 ERR( "can't get irq %ld, err %d\n",
2837                         odev->resource[2].start, status);
2838                 goto cleanup2;
2839         }
2840 #ifdef  USE_ISO
2841         status = request_irq(odev->resource[3].start, omap_udc_iso_irq,
2842                         SA_INTERRUPT, "omap_udc iso", udc);
2843         if (status != 0) {
2844                 ERR("can't get irq %ld, err %d\n",
2845                         odev->resource[3].start, status);
2846                 goto cleanup3;
2847         }
2848 #endif
2849
2850         create_proc_file();
2851         device_add(&udc->gadget.dev);
2852         return 0;
2853
2854 #ifdef  USE_ISO
2855 cleanup3:
2856         free_irq(odev->resource[2].start, udc);
2857 #endif
2858
2859 cleanup2:
2860         free_irq(odev->resource[1].start, udc);
2861
2862 cleanup1:
2863         kfree (udc);
2864         udc = NULL;
2865
2866 cleanup0:
2867         if (xceiv)
2868                 put_device(xceiv->dev);
2869         release_mem_region(odev->resource[0].start,
2870                         odev->resource[0].end - odev->resource[0].start + 1);
2871         return status;
2872 }
2873
2874 static int __exit omap_udc_remove(struct device *dev)
2875 {
2876         struct platform_device  *odev = to_platform_device(dev);
2877         DECLARE_COMPLETION(done);
2878
2879         if (!udc)
2880                 return -ENODEV;
2881
2882         udc->done = &done;
2883
2884         pullup_disable(udc);
2885         if (udc->transceiver) {
2886                 put_device(udc->transceiver->dev);
2887                 udc->transceiver = NULL;
2888         }
2889         UDC_SYSCON1_REG = 0;
2890
2891         remove_proc_file();
2892
2893 #ifdef  USE_ISO
2894         free_irq(odev->resource[3].start, udc);
2895 #endif
2896         free_irq(odev->resource[2].start, udc);
2897         free_irq(odev->resource[1].start, udc);
2898
2899         release_mem_region(odev->resource[0].start,
2900                         odev->resource[0].end - odev->resource[0].start + 1);
2901
2902         device_unregister(&udc->gadget.dev);
2903         wait_for_completion(&done);
2904
2905         return 0;
2906 }
2907
2908 /* suspend/resume/wakeup from sysfs (echo > power/state) or when the
2909  * system is forced into deep sleep
2910  *
2911  * REVISIT we should probably reject suspend requests when there's a host
2912  * session active, rather than disconnecting, at least on boards that can
2913  * report VBUS irqs (UDC_DEVSTAT_REG.UDC_ATT).  And in any case, we need to
2914  * make host resumes and VBUS detection trigger OMAP wakeup events; that
2915  * may involve talking to an external transceiver (e.g. isp1301).
2916  */
2917
2918 static int omap_udc_suspend(struct device *dev, pm_message_t message)
2919 {
2920         u32     devstat;
2921
2922         devstat = UDC_DEVSTAT_REG;
2923
2924         /* we're requesting 48 MHz clock if the pullup is enabled
2925          * (== we're attached to the host) and we're not suspended,
2926          * which would prevent entry to deep sleep...
2927          */
2928         if ((devstat & UDC_ATT) != 0 && (devstat & UDC_SUS) == 0) {
2929                 WARN("session active; suspend requires disconnect\n");
2930                 omap_pullup(&udc->gadget, 0);
2931         }
2932
2933         udc->gadget.dev.power.power_state = PMSG_SUSPEND;
2934         udc->gadget.dev.parent->power.power_state = PMSG_SUSPEND;
2935         return 0;
2936 }
2937
2938 static int omap_udc_resume(struct device *dev)
2939 {
2940         DBG("resume + wakeup/SRP\n");
2941         omap_pullup(&udc->gadget, 1);
2942
2943         /* maybe the host would enumerate us if we nudged it */
2944         msleep(100);
2945         return omap_wakeup(&udc->gadget);
2946 }
2947
2948 /*-------------------------------------------------------------------------*/
2949
2950 static struct device_driver udc_driver = {
2951         .name           = (char *) driver_name,
2952         .owner          = THIS_MODULE,
2953         .bus            = &platform_bus_type,
2954         .probe          = omap_udc_probe,
2955         .remove         = __exit_p(omap_udc_remove),
2956         .suspend        = omap_udc_suspend,
2957         .resume         = omap_udc_resume,
2958 };
2959
2960 static int __init udc_init(void)
2961 {
2962         INFO("%s, version: " DRIVER_VERSION
2963 #ifdef  USE_ISO
2964                 " (iso)"
2965 #endif
2966                 "%s\n", driver_desc,
2967                 use_dma ?  " (dma)" : "");
2968         return driver_register(&udc_driver);
2969 }
2970 module_init(udc_init);
2971
2972 static void __exit udc_exit(void)
2973 {
2974         driver_unregister(&udc_driver);
2975 }
2976 module_exit(udc_exit);
2977
2978 MODULE_DESCRIPTION(DRIVER_DESC);
2979 MODULE_LICENSE("GPL");
2980