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  * OMAP2 & DMA support by Kyungmin Park <kyungmin.park@samsung.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #undef  DEBUG
  25 #undef  VERBOSE
  26
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/ioport.h>
  30 #include <linux/types.h>
  31 #include <linux/errno.h>
  32 #include <linux/delay.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/platform_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 #include <linux/clk.h>
  47
  48 #include <asm/byteorder.h>
  49 #include <asm/io.h>
  50 #include <asm/irq.h>
  51 #include <asm/system.h>
  52 #include <asm/unaligned.h>
  53 #include <asm/mach-types.h>
  54
  55 #include <mach/dma.h>
  56 #include <mach/usb.h>
  57 #include <mach/control.h>
  58
  59 #include "omap_udc.h"
  60
  61 #undef  USB_TRACE
  62
  63 /* bulk DMA seems to be behaving for both IN and OUT */
  64 #define USE_DMA
  65
  66 /* ISO too */
  67 #define USE_ISO
  68
  69 #define DRIVER_DESC     "OMAP UDC driver"
  70 #define DRIVER_VERSION  "4 October 2004"
  71
  72 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
  73
  74 #define OMAP2_DMA_CH(ch)        (((ch) - 1) << 1)
  75 #define OMAP24XX_DMA(name, ch)  (OMAP24XX_DMA_##name + OMAP2_DMA_CH(ch))
  76
  77 /*
  78  * The OMAP UDC needs _very_ early endpoint setup:  before enabling the
  79  * D+ pullup to allow enumeration.  That's too early for the gadget
  80  * framework to use from usb_endpoint_enable(), which happens after
  81  * enumeration as part of activating an interface.  (But if we add an
  82  * optional new "UDC not yet running" state to the gadget driver model,
  83  * even just during driver binding, the endpoint autoconfig logic is the
  84  * natural spot to manufacture new endpoints.)
  85  *
  86  * So instead of using endpoint enable calls to control the hardware setup,
  87  * this driver defines a "fifo mode" parameter.  It's used during driver
  88  * initialization to choose among a set of pre-defined endpoint configs.
  89  * See omap_udc_setup() for available modes, or to add others.  That code
  90  * lives in an init section, so use this driver as a module if you need
  91  * to change the fifo mode after the kernel boots.
  92  *
  93  * Gadget drivers normally ignore endpoints they don't care about, and
  94  * won't include them in configuration descriptors.  That means only
  95  * misbehaving hosts would even notice they exist.
  96  */
  97 #ifdef  USE_ISO
  98 static unsigned fifo_mode = 3;
  99 #else
 100 static unsigned fifo_mode = 0;
 101 #endif
 102
 103 /* "modprobe omap_udc fifo_mode=42", or else as a kernel
 104  * boot parameter "omap_udc:fifo_mode=42"
 105  */
 106 module_param (fifo_mode, uint, 0);
 107 MODULE_PARM_DESC (fifo_mode, "endpoint configuration");
 108
 109 #ifdef  USE_DMA
 110 static unsigned use_dma = 1;
 111
 112 /* "modprobe omap_udc use_dma=y", or else as a kernel
 113  * boot parameter "omap_udc:use_dma=y"
 114  */
 115 module_param (use_dma, bool, 0);
 116 MODULE_PARM_DESC (use_dma, "enable/disable DMA");
 117 #else   /* !USE_DMA */
 118
 119 /* save a bit of code */
 120 #define use_dma         0
 121 #endif  /* !USE_DMA */
 122
 123
 124 static const char driver_name [] = "omap_udc";
 125 static const char driver_desc [] = DRIVER_DESC;
 126
 127 /*-------------------------------------------------------------------------*/
 128
 129 /* there's a notion of "current endpoint" for modifying endpoint
 130  * state, and PIO access to its FIFO.
 131  */
 132
 133 static void use_ep(struct omap_ep *ep, u16 select)
 134 {
 135         u16     num = ep->bEndpointAddress & 0x0f;
 136
 137         if (ep->bEndpointAddress & USB_DIR_IN)
 138                 num |= UDC_EP_DIR;
 139         omap_writew(num | select, UDC_EP_NUM);
 140         /* when select, MUST deselect later !! */
 141 }
 142
 143 static inline void deselect_ep(void)
 144 {
 145         u16 w;
 146
 147         w = omap_readw(UDC_EP_NUM);
 148         w &= ~UDC_EP_SEL;
 149         omap_writew(w, UDC_EP_NUM);
 150         /* 6 wait states before TX will happen */
 151 }
 152
 153 static void dma_channel_claim(struct omap_ep *ep, unsigned preferred);
 154
 155 /*-------------------------------------------------------------------------*/
 156
 157 static int omap_ep_enable(struct usb_ep *_ep,
 158                 const struct usb_endpoint_descriptor *desc)
 159 {
 160         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
 161         struct omap_udc *udc;
 162         unsigned long   flags;
 163         u16             maxp;
 164
 165         /* catch various bogus parameters */
 166         if (!_ep || !desc || ep->desc
 167                         || desc->bDescriptorType != USB_DT_ENDPOINT
 168                         || ep->bEndpointAddress != desc->bEndpointAddress
 169                         || ep->maxpacket < le16_to_cpu
 170                                                 (desc->wMaxPacketSize)) {
 171                 DBG("%s, bad ep or descriptor\n", __func__);
 172                 return -EINVAL;
 173         }
 174         maxp = le16_to_cpu (desc->wMaxPacketSize);
 175         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 176                                 && maxp != ep->maxpacket)
 177                         || le16_to_cpu(desc->wMaxPacketSize) > ep->maxpacket
 178                         || !desc->wMaxPacketSize) {
 179                 DBG("%s, bad %s maxpacket\n", __func__, _ep->name);
 180                 return -ERANGE;
 181         }
 182
 183 #ifdef  USE_ISO
 184         if ((desc->bmAttributes == USB_ENDPOINT_XFER_ISOC
 185                                 && desc->bInterval != 1)) {
 186                 /* hardware wants period = 1; USB allows 2^(Interval-1) */
 187                 DBG("%s, unsupported ISO period %dms\n", _ep->name,
 188                                 1 << (desc->bInterval - 1));
 189                 return -EDOM;
 190         }
 191 #else
 192         if (desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 193                 DBG("%s, ISO nyet\n", _ep->name);
 194                 return -EDOM;
 195         }
 196 #endif
 197
 198         /* xfer types must match, except that interrupt ~= bulk */
 199         if (ep->bmAttributes != desc->bmAttributes
 200                         && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 201                         && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 202                 DBG("%s, %s type mismatch\n", __func__, _ep->name);
 203                 return -EINVAL;
 204         }
 205
 206         udc = ep->udc;
 207         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
 208                 DBG("%s, bogus device state\n", __func__);
 209                 return -ESHUTDOWN;
 210         }
 211
 212         spin_lock_irqsave(&udc->lock, flags);
 213
 214         ep->desc = desc;
 215         ep->irqs = 0;
 216         ep->stopped = 0;
 217         ep->ep.maxpacket = maxp;
 218
 219         /* set endpoint to initial state */
 220         ep->dma_channel = 0;
 221         ep->has_dma = 0;
 222         ep->lch = -1;
 223         use_ep(ep, UDC_EP_SEL);
 224         omap_writew(udc->clr_halt, UDC_CTRL);
 225         ep->ackwait = 0;
 226         deselect_ep();
 227
 228         if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
 229                 list_add(&ep->iso, &udc->iso);
 230
 231         /* maybe assign a DMA channel to this endpoint */
 232         if (use_dma && desc->bmAttributes == USB_ENDPOINT_XFER_BULK)
 233                 /* FIXME ISO can dma, but prefers first channel */
 234                 dma_channel_claim(ep, 0);
 235
 236         /* PIO OUT may RX packets */
 237         if (desc->bmAttributes != USB_ENDPOINT_XFER_ISOC
 238                         && !ep->has_dma
 239                         && !(ep->bEndpointAddress & USB_DIR_IN)) {
 240                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 241                 ep->ackwait = 1 + ep->double_buf;
 242         }
 243
 244         spin_unlock_irqrestore(&udc->lock, flags);
 245         VDBG("%s enabled\n", _ep->name);
 246         return 0;
 247 }
 248
 249 static void nuke(struct omap_ep *, int status);
 250
 251 static int omap_ep_disable(struct usb_ep *_ep)
 252 {
 253         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
 254         unsigned long   flags;
 255
 256         if (!_ep || !ep->desc) {
 257                 DBG("%s, %s not enabled\n", __func__,
 258                         _ep ? ep->ep.name : NULL);
 259                 return -EINVAL;
 260         }
 261
 262         spin_lock_irqsave(&ep->udc->lock, flags);
 263         ep->desc = NULL;
 264         nuke (ep, -ESHUTDOWN);
 265         ep->ep.maxpacket = ep->maxpacket;
 266         ep->has_dma = 0;
 267         omap_writew(UDC_SET_HALT, UDC_CTRL);
 268         list_del_init(&ep->iso);
 269         del_timer(&ep->timer);
 270
 271         spin_unlock_irqrestore(&ep->udc->lock, flags);
 272
 273         VDBG("%s disabled\n", _ep->name);
 274         return 0;
 275 }
 276
 277 /*-------------------------------------------------------------------------*/
 278
 279 static struct usb_request *
 280 omap_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
 281 {
 282         struct omap_req *req;
 283
 284         req = kzalloc(sizeof(*req), gfp_flags);
 285         if (req) {
 286                 req->req.dma = DMA_ADDR_INVALID;
 287                 INIT_LIST_HEAD (&req->queue);
 288         }
 289         return &req->req;
 290 }
 291
 292 static void
 293 omap_free_request(struct usb_ep *ep, struct usb_request *_req)
 294 {
 295         struct omap_req *req = container_of(_req, struct omap_req, req);
 296
 297         if (_req)
 298                 kfree (req);
 299 }
 300
 301 /*-------------------------------------------------------------------------*/
 302
 303 static void
 304 done(struct omap_ep *ep, struct omap_req *req, int status)
 305 {
 306         unsigned                stopped = ep->stopped;
 307
 308         list_del_init(&req->queue);
 309
 310         if (req->req.status == -EINPROGRESS)
 311                 req->req.status = status;
 312         else
 313                 status = req->req.status;
 314
 315         if (use_dma && ep->has_dma) {
 316                 if (req->mapped) {
 317                         dma_unmap_single(ep->udc->gadget.dev.parent,
 318                                 req->req.dma, req->req.length,
 319                                 (ep->bEndpointAddress & USB_DIR_IN)
 320                                         ? DMA_TO_DEVICE
 321                                         : DMA_FROM_DEVICE);
 322                         req->req.dma = DMA_ADDR_INVALID;
 323                         req->mapped = 0;
 324                 } else
 325                         dma_sync_single_for_cpu(ep->udc->gadget.dev.parent,
 326                                 req->req.dma, req->req.length,
 327                                 (ep->bEndpointAddress & USB_DIR_IN)
 328                                         ? DMA_TO_DEVICE
 329                                         : DMA_FROM_DEVICE);
 330         }
 331
 332 #ifndef USB_TRACE
 333         if (status && status != -ESHUTDOWN)
 334 #endif
 335                 VDBG("complete %s req %p stat %d len %u/%u\n",
 336                         ep->ep.name, &req->req, status,
 337                         req->req.actual, req->req.length);
 338
 339         /* don't modify queue heads during completion callback */
 340         ep->stopped = 1;
 341         spin_unlock(&ep->udc->lock);
 342         req->req.complete(&ep->ep, &req->req);
 343         spin_lock(&ep->udc->lock);
 344         ep->stopped = stopped;
 345 }
 346
 347 /*-------------------------------------------------------------------------*/
 348
 349 #define UDC_FIFO_FULL           (UDC_NON_ISO_FIFO_FULL | UDC_ISO_FIFO_FULL)
 350 #define UDC_FIFO_UNWRITABLE     (UDC_EP_HALTED | UDC_FIFO_FULL)
 351
 352 #define FIFO_EMPTY      (UDC_NON_ISO_FIFO_EMPTY | UDC_ISO_FIFO_EMPTY)
 353 #define FIFO_UNREADABLE (UDC_EP_HALTED | FIFO_EMPTY)
 354
 355 static inline int
 356 write_packet(u8 *buf, struct omap_req *req, unsigned max)
 357 {
 358         unsigned        len;
 359         u16             *wp;
 360
 361         len = min(req->req.length - req->req.actual, max);
 362         req->req.actual += len;
 363
 364         max = len;
 365         if (likely((((int)buf) & 1) == 0)) {
 366                 wp = (u16 *)buf;
 367                 while (max >= 2) {
 368                         omap_writew(*wp++, UDC_DATA);
 369                         max -= 2;
 370                 }
 371                 buf = (u8 *)wp;
 372         }
 373         while (max--)
 374                 omap_writeb(*buf++, UDC_DATA);
 375         return len;
 376 }
 377
 378 // FIXME change r/w fifo calling convention
 379
 380
 381 // return:  0 = still running, 1 = completed, negative = errno
 382 static int write_fifo(struct omap_ep *ep, struct omap_req *req)
 383 {
 384         u8              *buf;
 385         unsigned        count;
 386         int             is_last;
 387         u16             ep_stat;
 388
 389         buf = req->req.buf + req->req.actual;
 390         prefetch(buf);
 391
 392         /* PIO-IN isn't double buffered except for iso */
 393         ep_stat = omap_readw(UDC_STAT_FLG);
 394         if (ep_stat & UDC_FIFO_UNWRITABLE)
 395                 return 0;
 396
 397         count = ep->ep.maxpacket;
 398         count = write_packet(buf, req, count);
 399         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 400         ep->ackwait = 1;
 401
 402         /* last packet is often short (sometimes a zlp) */
 403         if (count != ep->ep.maxpacket)
 404                 is_last = 1;
 405         else if (req->req.length == req->req.actual
 406                         && !req->req.zero)
 407                 is_last = 1;
 408         else
 409                 is_last = 0;
 410
 411         /* NOTE:  requests complete when all IN data is in a
 412          * FIFO (or sometimes later, if a zlp was needed).
 413          * Use usb_ep_fifo_status() where needed.
 414          */
 415         if (is_last)
 416                 done(ep, req, 0);
 417         return is_last;
 418 }
 419
 420 static inline int
 421 read_packet(u8 *buf, struct omap_req *req, unsigned avail)
 422 {
 423         unsigned        len;
 424         u16             *wp;
 425
 426         len = min(req->req.length - req->req.actual, avail);
 427         req->req.actual += len;
 428         avail = len;
 429
 430         if (likely((((int)buf) & 1) == 0)) {
 431                 wp = (u16 *)buf;
 432                 while (avail >= 2) {
 433                         *wp++ = omap_readw(UDC_DATA);
 434                         avail -= 2;
 435                 }
 436                 buf = (u8 *)wp;
 437         }
 438         while (avail--)
 439                 *buf++ = omap_readb(UDC_DATA);
 440         return len;
 441 }
 442
 443 // return:  0 = still running, 1 = queue empty, negative = errno
 444 static int read_fifo(struct omap_ep *ep, struct omap_req *req)
 445 {
 446         u8              *buf;
 447         unsigned        count, avail;
 448         int             is_last;
 449
 450         buf = req->req.buf + req->req.actual;
 451         prefetchw(buf);
 452
 453         for (;;) {
 454                 u16     ep_stat = omap_readw(UDC_STAT_FLG);
 455
 456                 is_last = 0;
 457                 if (ep_stat & FIFO_EMPTY) {
 458                         if (!ep->double_buf)
 459                                 break;
 460                         ep->fnf = 1;
 461                 }
 462                 if (ep_stat & UDC_EP_HALTED)
 463                         break;
 464
 465                 if (ep_stat & UDC_FIFO_FULL)
 466                         avail = ep->ep.maxpacket;
 467                 else  {
 468                         avail = omap_readw(UDC_RXFSTAT);
 469                         ep->fnf = ep->double_buf;
 470                 }
 471                 count = read_packet(buf, req, avail);
 472
 473                 /* partial packet reads may not be errors */
 474                 if (count < ep->ep.maxpacket) {
 475                         is_last = 1;
 476                         /* overflowed this request?  flush extra data */
 477                         if (count != avail) {
 478                                 req->req.status = -EOVERFLOW;
 479                                 avail -= count;
 480                                 while (avail--)
 481                                         omap_readw(UDC_DATA);
 482                         }
 483                 } else if (req->req.length == req->req.actual)
 484                         is_last = 1;
 485                 else
 486                         is_last = 0;
 487
 488                 if (!ep->bEndpointAddress)
 489                         break;
 490                 if (is_last)
 491                         done(ep, req, 0);
 492                 break;
 493         }
 494         return is_last;
 495 }
 496
 497 /*-------------------------------------------------------------------------*/
 498
 499 static u16 dma_src_len(struct omap_ep *ep, dma_addr_t start)
 500 {
 501         dma_addr_t      end;
 502
 503         /* IN-DMA needs this on fault/cancel paths, so 15xx misreports
 504          * the last transfer's bytecount by more than a FIFO's worth.
 505          */
 506         if (cpu_is_omap15xx())
 507                 return 0;
 508
 509         end = omap_get_dma_src_pos(ep->lch);
 510         if (end == ep->dma_counter)
 511                 return 0;
 512
 513         end |= start & (0xffff << 16);
 514         if (end < start)
 515                 end += 0x10000;
 516         return end - start;
 517 }
 518
 519 static u16 dma_dest_len(struct omap_ep *ep, dma_addr_t start)
 520 {
 521         dma_addr_t      end;
 522
 523         end = omap_get_dma_dst_pos(ep->lch);
 524         if (end == ep->dma_counter)
 525                 return 0;
 526
 527         end |= start & (0xffff << 16);
 528         if (cpu_is_omap15xx())
 529                 end++;
 530         if (end < start)
 531                 end += 0x10000;
 532         return end - start;
 533 }
 534
 535
 536 /* Each USB transfer request using DMA maps to one or more DMA transfers.
 537  * When DMA completion isn't request completion, the UDC continues with
 538  * the next DMA transfer for that USB transfer.
 539  */
 540
 541 static void next_in_dma(struct omap_ep *ep, struct omap_req *req)
 542 {
 543         u16             txdma_ctrl, w;
 544         unsigned        length = req->req.length - req->req.actual;
 545         const int       sync_mode = cpu_is_omap15xx()
 546                                 ? OMAP_DMA_SYNC_FRAME
 547                                 : OMAP_DMA_SYNC_ELEMENT;
 548         int             dma_trigger = 0;
 549
 550         if (cpu_is_omap24xx())
 551                 dma_trigger = OMAP24XX_DMA(USB_W2FC_TX0, ep->dma_channel);
 552
 553         /* measure length in either bytes or packets */
 554         if ((cpu_is_omap16xx() && length <= UDC_TXN_TSC)
 555                         || (cpu_is_omap24xx() && length < ep->maxpacket)
 556                         || (cpu_is_omap15xx() && length < ep->maxpacket)) {
 557                 txdma_ctrl = UDC_TXN_EOT | length;
 558                 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8,
 559                                 length, 1, sync_mode, dma_trigger, 0);
 560         } else {
 561                 length = min(length / ep->maxpacket,
 562                                 (unsigned) UDC_TXN_TSC + 1);
 563                 txdma_ctrl = length;
 564                 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
 565                                 ep->ep.maxpacket >> 1, length, sync_mode,
 566                                 dma_trigger, 0);
 567                 length *= ep->maxpacket;
 568         }
 569         omap_set_dma_src_params(ep->lch, OMAP_DMA_PORT_EMIFF,
 570                 OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual,
 571                 0, 0);
 572
 573         omap_start_dma(ep->lch);
 574         ep->dma_counter = omap_get_dma_src_pos(ep->lch);
 575         w = omap_readw(UDC_DMA_IRQ_EN);
 576         w |= UDC_TX_DONE_IE(ep->dma_channel);
 577         omap_writew(w, UDC_DMA_IRQ_EN);
 578         omap_writew(UDC_TXN_START | txdma_ctrl, UDC_TXDMA(ep->dma_channel));
 579         req->dma_bytes = length;
 580 }
 581
 582 static void finish_in_dma(struct omap_ep *ep, struct omap_req *req, int status)
 583 {
 584         u16 w;
 585
 586         if (status == 0) {
 587                 req->req.actual += req->dma_bytes;
 588
 589                 /* return if this request needs to send data or zlp */
 590                 if (req->req.actual < req->req.length)
 591                         return;
 592                 if (req->req.zero
 593                                 && req->dma_bytes != 0
 594                                 && (req->req.actual % ep->maxpacket) == 0)
 595                         return;
 596         } else
 597                 req->req.actual += dma_src_len(ep, req->req.dma
 598                                                         + req->req.actual);
 599
 600         /* tx completion */
 601         omap_stop_dma(ep->lch);
 602         w = omap_readw(UDC_DMA_IRQ_EN);
 603         w &= ~UDC_TX_DONE_IE(ep->dma_channel);
 604         omap_writew(w, UDC_DMA_IRQ_EN);
 605         done(ep, req, status);
 606 }
 607
 608 static void next_out_dma(struct omap_ep *ep, struct omap_req *req)
 609 {
 610         unsigned packets = req->req.length - req->req.actual;
 611         int dma_trigger = 0;
 612         u16 w;
 613
 614         if (cpu_is_omap24xx())
 615                 dma_trigger = OMAP24XX_DMA(USB_W2FC_RX0, ep->dma_channel);
 616
 617         /* NOTE:  we filtered out "short reads" before, so we know
 618          * the buffer has only whole numbers of packets.
 619          * except MODE SELECT(6) sent the 24 bytes data in OMAP24XX DMA mode
 620          */
 621         if (cpu_is_omap24xx() && packets < ep->maxpacket) {
 622                 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8,
 623                                 packets, 1, OMAP_DMA_SYNC_ELEMENT,
 624                                 dma_trigger, 0);
 625                 req->dma_bytes = packets;
 626         } else {
 627                 /* set up this DMA transfer, enable the fifo, start */
 628                 packets /= ep->ep.maxpacket;
 629                 packets = min(packets, (unsigned)UDC_RXN_TC + 1);
 630                 req->dma_bytes = packets * ep->ep.maxpacket;
 631                 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16,
 632                                 ep->ep.maxpacket >> 1, packets,
 633                                 OMAP_DMA_SYNC_ELEMENT,
 634                                 dma_trigger, 0);
 635         }
 636         omap_set_dma_dest_params(ep->lch, OMAP_DMA_PORT_EMIFF,
 637                 OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual,
 638                 0, 0);
 639         ep->dma_counter = omap_get_dma_dst_pos(ep->lch);
 640
 641         omap_writew(UDC_RXN_STOP | (packets - 1), UDC_RXDMA(ep->dma_channel));
 642         w = omap_readw(UDC_DMA_IRQ_EN);
 643         w |= UDC_RX_EOT_IE(ep->dma_channel);
 644         omap_writew(w, UDC_DMA_IRQ_EN);
 645         omap_writew(ep->bEndpointAddress & 0xf, UDC_EP_NUM);
 646         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 647
 648         omap_start_dma(ep->lch);
 649 }
 650
 651 static void
 652 finish_out_dma(struct omap_ep *ep, struct omap_req *req, int status, int one)
 653 {
 654         u16     count, w;
 655
 656         if (status == 0)
 657                 ep->dma_counter = (u16) (req->req.dma + req->req.actual);
 658         count = dma_dest_len(ep, req->req.dma + req->req.actual);
 659         count += req->req.actual;
 660         if (one)
 661                 count--;
 662         if (count <= req->req.length)
 663                 req->req.actual = count;
 664
 665         if (count != req->dma_bytes || status)
 666                 omap_stop_dma(ep->lch);
 667
 668         /* if this wasn't short, request may need another transfer */
 669         else if (req->req.actual < req->req.length)
 670                 return;
 671
 672         /* rx completion */
 673         w = omap_readw(UDC_DMA_IRQ_EN);
 674         w &= ~UDC_RX_EOT_IE(ep->dma_channel);
 675         omap_writew(w, UDC_DMA_IRQ_EN);
 676         done(ep, req, status);
 677 }
 678
 679 static void dma_irq(struct omap_udc *udc, u16 irq_src)
 680 {
 681         u16             dman_stat = omap_readw(UDC_DMAN_STAT);
 682         struct omap_ep  *ep;
 683         struct omap_req *req;
 684
 685         /* IN dma: tx to host */
 686         if (irq_src & UDC_TXN_DONE) {
 687                 ep = &udc->ep[16 + UDC_DMA_TX_SRC(dman_stat)];
 688                 ep->irqs++;
 689                 /* can see TXN_DONE after dma abort */
 690                 if (!list_empty(&ep->queue)) {
 691                         req = container_of(ep->queue.next,
 692                                                 struct omap_req, queue);
 693                         finish_in_dma(ep, req, 0);
 694                 }
 695                 omap_writew(UDC_TXN_DONE, UDC_IRQ_SRC);
 696
 697                 if (!list_empty (&ep->queue)) {
 698                         req = container_of(ep->queue.next,
 699                                         struct omap_req, queue);
 700                         next_in_dma(ep, req);
 701                 }
 702         }
 703
 704         /* OUT dma: rx from host */
 705         if (irq_src & UDC_RXN_EOT) {
 706                 ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
 707                 ep->irqs++;
 708                 /* can see RXN_EOT after dma abort */
 709                 if (!list_empty(&ep->queue)) {
 710                         req = container_of(ep->queue.next,
 711                                         struct omap_req, queue);
 712                         finish_out_dma(ep, req, 0, dman_stat & UDC_DMA_RX_SB);
 713                 }
 714                 omap_writew(UDC_RXN_EOT, UDC_IRQ_SRC);
 715
 716                 if (!list_empty (&ep->queue)) {
 717                         req = container_of(ep->queue.next,
 718                                         struct omap_req, queue);
 719                         next_out_dma(ep, req);
 720                 }
 721         }
 722
 723         if (irq_src & UDC_RXN_CNT) {
 724                 ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)];
 725                 ep->irqs++;
 726                 /* omap15xx does this unasked... */
 727                 VDBG("%s, RX_CNT irq?\n", ep->ep.name);
 728                 omap_writew(UDC_RXN_CNT, UDC_IRQ_SRC);
 729         }
 730 }
 731
 732 static void dma_error(int lch, u16 ch_status, void *data)
 733 {
 734         struct omap_ep  *ep = data;
 735
 736         /* if ch_status & OMAP_DMA_DROP_IRQ ... */
 737         /* if ch_status & OMAP1_DMA_TOUT_IRQ ... */
 738         ERR("%s dma error, lch %d status %02x\n", ep->ep.name, lch, ch_status);
 739
 740         /* complete current transfer ... */
 741 }
 742
 743 static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
 744 {
 745         u16     reg;
 746         int     status, restart, is_in;
 747         int     dma_channel;
 748
 749         is_in = ep->bEndpointAddress & USB_DIR_IN;
 750         if (is_in)
 751                 reg = omap_readw(UDC_TXDMA_CFG);
 752         else
 753                 reg = omap_readw(UDC_RXDMA_CFG);
 754         reg |= UDC_DMA_REQ;             /* "pulse" activated */
 755
 756         ep->dma_channel = 0;
 757         ep->lch = -1;
 758         if (channel == 0 || channel > 3) {
 759                 if ((reg & 0x0f00) == 0)
 760                         channel = 3;
 761                 else if ((reg & 0x00f0) == 0)
 762                         channel = 2;
 763                 else if ((reg & 0x000f) == 0)   /* preferred for ISO */
 764                         channel = 1;
 765                 else {
 766                         status = -EMLINK;
 767                         goto just_restart;
 768                 }
 769         }
 770         reg |= (0x0f & ep->bEndpointAddress) << (4 * (channel - 1));
 771         ep->dma_channel = channel;
 772
 773         if (is_in) {
 774                 if (cpu_is_omap24xx())
 775                         dma_channel = OMAP24XX_DMA(USB_W2FC_TX0, channel);
 776                 else
 777                         dma_channel = OMAP_DMA_USB_W2FC_TX0 - 1 + channel;
 778                 status = omap_request_dma(dma_channel,
 779                         ep->ep.name, dma_error, ep, &ep->lch);
 780                 if (status == 0) {
 781                         omap_writew(reg, UDC_TXDMA_CFG);
 782                         /* EMIFF or SDRC */
 783                         omap_set_dma_src_burst_mode(ep->lch,
 784                                                 OMAP_DMA_DATA_BURST_4);
 785                         omap_set_dma_src_data_pack(ep->lch, 1);
 786                         /* TIPB */
 787                         omap_set_dma_dest_params(ep->lch,
 788                                 OMAP_DMA_PORT_TIPB,
 789                                 OMAP_DMA_AMODE_CONSTANT,
 790                                 UDC_DATA_DMA,
 791                                 0, 0);
 792                 }
 793         } else {
 794                 if (cpu_is_omap24xx())
 795                         dma_channel = OMAP24XX_DMA(USB_W2FC_RX0, channel);
 796                 else
 797                         dma_channel = OMAP_DMA_USB_W2FC_RX0 - 1 + channel;
 798
 799                 status = omap_request_dma(dma_channel,
 800                         ep->ep.name, dma_error, ep, &ep->lch);
 801                 if (status == 0) {
 802                         omap_writew(reg, UDC_RXDMA_CFG);
 803                         /* TIPB */
 804                         omap_set_dma_src_params(ep->lch,
 805                                 OMAP_DMA_PORT_TIPB,
 806                                 OMAP_DMA_AMODE_CONSTANT,
 807                                 UDC_DATA_DMA,
 808                                 0, 0);
 809                         /* EMIFF or SDRC */
 810                         omap_set_dma_dest_burst_mode(ep->lch,
 811                                                 OMAP_DMA_DATA_BURST_4);
 812                         omap_set_dma_dest_data_pack(ep->lch, 1);
 813                 }
 814         }
 815         if (status)
 816                 ep->dma_channel = 0;
 817         else {
 818                 ep->has_dma = 1;
 819                 omap_disable_dma_irq(ep->lch, OMAP_DMA_BLOCK_IRQ);
 820
 821                 /* channel type P: hw synch (fifo) */
 822                 if (cpu_class_is_omap1() && !cpu_is_omap15xx())
 823                         omap_set_dma_channel_mode(ep->lch, OMAP_DMA_LCH_P);
 824         }
 825
 826 just_restart:
 827         /* restart any queue, even if the claim failed  */
 828         restart = !ep->stopped && !list_empty(&ep->queue);
 829
 830         if (status)
 831                 DBG("%s no dma channel: %d%s\n", ep->ep.name, status,
 832                         restart ? " (restart)" : "");
 833         else
 834                 DBG("%s claimed %cxdma%d lch %d%s\n", ep->ep.name,
 835                         is_in ? 't' : 'r',
 836                         ep->dma_channel - 1, ep->lch,
 837                         restart ? " (restart)" : "");
 838
 839         if (restart) {
 840                 struct omap_req *req;
 841                 req = container_of(ep->queue.next, struct omap_req, queue);
 842                 if (ep->has_dma)
 843                         (is_in ? next_in_dma : next_out_dma)(ep, req);
 844                 else {
 845                         use_ep(ep, UDC_EP_SEL);
 846                         (is_in ? write_fifo : read_fifo)(ep, req);
 847                         deselect_ep();
 848                         if (!is_in) {
 849                                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 850                                 ep->ackwait = 1 + ep->double_buf;
 851                         }
 852                         /* IN: 6 wait states before it'll tx */
 853                 }
 854         }
 855 }
 856
 857 static void dma_channel_release(struct omap_ep *ep)
 858 {
 859         int             shift = 4 * (ep->dma_channel - 1);
 860         u16             mask = 0x0f << shift;
 861         struct omap_req *req;
 862         int             active;
 863
 864         /* abort any active usb transfer request */
 865         if (!list_empty(&ep->queue))
 866                 req = container_of(ep->queue.next, struct omap_req, queue);
 867         else
 868                 req = NULL;
 869
 870         active = omap_get_dma_active_status(ep->lch);
 871
 872         DBG("%s release %s %cxdma%d %p\n", ep->ep.name,
 873                         active ? "active" : "idle",
 874                         (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
 875                         ep->dma_channel - 1, req);
 876
 877         /* NOTE: re-setting RX_REQ/TX_REQ because of a chip bug (before
 878          * OMAP 1710 ES2.0) where reading the DMA_CFG can clear them.
 879          */
 880
 881         /* wait till current packet DMA finishes, and fifo empties */
 882         if (ep->bEndpointAddress & USB_DIR_IN) {
 883                 omap_writew((omap_readw(UDC_TXDMA_CFG) & ~mask) | UDC_DMA_REQ,
 884                                         UDC_TXDMA_CFG);
 885
 886                 if (req) {
 887                         finish_in_dma(ep, req, -ECONNRESET);
 888
 889                         /* clear FIFO; hosts probably won't empty it */
 890                         use_ep(ep, UDC_EP_SEL);
 891                         omap_writew(UDC_CLR_EP, UDC_CTRL);
 892                         deselect_ep();
 893                 }
 894                 while (omap_readw(UDC_TXDMA_CFG) & mask)
 895                         udelay(10);
 896         } else {
 897                 omap_writew((omap_readw(UDC_RXDMA_CFG) & ~mask) | UDC_DMA_REQ,
 898                                         UDC_RXDMA_CFG);
 899
 900                 /* dma empties the fifo */
 901                 while (omap_readw(UDC_RXDMA_CFG) & mask)
 902                         udelay(10);
 903                 if (req)
 904                         finish_out_dma(ep, req, -ECONNRESET, 0);
 905         }
 906         omap_free_dma(ep->lch);
 907         ep->dma_channel = 0;
 908         ep->lch = -1;
 909         /* has_dma still set, till endpoint is fully quiesced */
 910 }
 911
 912
 913 /*-------------------------------------------------------------------------*/
 914
 915 static int
 916 omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 917 {
 918         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
 919         struct omap_req *req = container_of(_req, struct omap_req, req);
 920         struct omap_udc *udc;
 921         unsigned long   flags;
 922         int             is_iso = 0;
 923
 924         /* catch various bogus parameters */
 925         if (!_req || !req->req.complete || !req->req.buf
 926                         || !list_empty(&req->queue)) {
 927                 DBG("%s, bad params\n", __func__);
 928                 return -EINVAL;
 929         }
 930         if (!_ep || (!ep->desc && ep->bEndpointAddress)) {
 931                 DBG("%s, bad ep\n", __func__);
 932                 return -EINVAL;
 933         }
 934         if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
 935                 if (req->req.length > ep->ep.maxpacket)
 936                         return -EMSGSIZE;
 937                 is_iso = 1;
 938         }
 939
 940         /* this isn't bogus, but OMAP DMA isn't the only hardware to
 941          * have a hard time with partial packet reads...  reject it.
 942          * Except OMAP2 can handle the small packets.
 943          */
 944         if (use_dma
 945                         && ep->has_dma
 946                         && ep->bEndpointAddress != 0
 947                         && (ep->bEndpointAddress & USB_DIR_IN) == 0
 948                         && !cpu_class_is_omap2()
 949                         && (req->req.length % ep->ep.maxpacket) != 0) {
 950                 DBG("%s, no partial packet OUT reads\n", __func__);
 951                 return -EMSGSIZE;
 952         }
 953
 954         udc = ep->udc;
 955         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
 956                 return -ESHUTDOWN;
 957
 958         if (use_dma && ep->has_dma) {
 959                 if (req->req.dma == DMA_ADDR_INVALID) {
 960                         req->req.dma = dma_map_single(
 961                                 ep->udc->gadget.dev.parent,
 962                                 req->req.buf,
 963                                 req->req.length,
 964                                 (ep->bEndpointAddress & USB_DIR_IN)
 965                                         ? DMA_TO_DEVICE
 966                                         : DMA_FROM_DEVICE);
 967                         req->mapped = 1;
 968                 } else {
 969                         dma_sync_single_for_device(
 970                                 ep->udc->gadget.dev.parent,
 971                                 req->req.dma, req->req.length,
 972                                 (ep->bEndpointAddress & USB_DIR_IN)
 973                                         ? DMA_TO_DEVICE
 974                                         : DMA_FROM_DEVICE);
 975                         req->mapped = 0;
 976                 }
 977         }
 978
 979         VDBG("%s queue req %p, len %d buf %p\n",
 980                 ep->ep.name, _req, _req->length, _req->buf);
 981
 982         spin_lock_irqsave(&udc->lock, flags);
 983
 984         req->req.status = -EINPROGRESS;
 985         req->req.actual = 0;
 986
 987         /* maybe kickstart non-iso i/o queues */
 988         if (is_iso) {
 989                 u16 w;
 990
 991                 w = omap_readw(UDC_IRQ_EN);
 992                 w |= UDC_SOF_IE;
 993                 omap_writew(w, UDC_IRQ_EN);
 994         } else if (list_empty(&ep->queue) && !ep->stopped && !ep->ackwait) {
 995                 int     is_in;
 996
 997                 if (ep->bEndpointAddress == 0) {
 998                         if (!udc->ep0_pending || !list_empty (&ep->queue)) {
 999                                 spin_unlock_irqrestore(&udc->lock, flags);
1000                                 return -EL2HLT;
1001                         }
1002
1003                         /* empty DATA stage? */
1004                         is_in = udc->ep0_in;
1005                         if (!req->req.length) {
1006
1007                                 /* chip became CONFIGURED or ADDRESSED
1008                                  * earlier; drivers may already have queued
1009                                  * requests to non-control endpoints
1010                                  */
1011                                 if (udc->ep0_set_config) {
1012                                         u16     irq_en = omap_readw(UDC_IRQ_EN);
1013
1014                                         irq_en |= UDC_DS_CHG_IE | UDC_EP0_IE;
1015                                         if (!udc->ep0_reset_config)
1016                                                 irq_en |= UDC_EPN_RX_IE
1017                                                         | UDC_EPN_TX_IE;
1018                                         omap_writew(irq_en, UDC_IRQ_EN);
1019                                 }
1020
1021                                 /* STATUS for zero length DATA stages is
1022                                  * always an IN ... even for IN transfers,
1023                                  * a weird case which seem to stall OMAP.
1024                                  */
1025                                 omap_writew(UDC_EP_SEL | UDC_EP_DIR, UDC_EP_NUM);
1026                                 omap_writew(UDC_CLR_EP, UDC_CTRL);
1027                                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1028                                 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1029
1030                                 /* cleanup */
1031                                 udc->ep0_pending = 0;
1032                                 done(ep, req, 0);
1033                                 req = NULL;
1034
1035                         /* non-empty DATA stage */
1036                         } else if (is_in) {
1037                                 omap_writew(UDC_EP_SEL | UDC_EP_DIR, UDC_EP_NUM);
1038                         } else {
1039                                 if (udc->ep0_setup)
1040                                         goto irq_wait;
1041                                 omap_writew(UDC_EP_SEL, UDC_EP_NUM);
1042                         }
1043                 } else {
1044                         is_in = ep->bEndpointAddress & USB_DIR_IN;
1045                         if (!ep->has_dma)
1046                                 use_ep(ep, UDC_EP_SEL);
1047                         /* if ISO: SOF IRQs must be enabled/disabled! */
1048                 }
1049
1050                 if (ep->has_dma)
1051                         (is_in ? next_in_dma : next_out_dma)(ep, req);
1052                 else if (req) {
1053                         if ((is_in ? write_fifo : read_fifo)(ep, req) == 1)
1054                                 req = NULL;
1055                         deselect_ep();
1056                         if (!is_in) {
1057                                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1058                                 ep->ackwait = 1 + ep->double_buf;
1059                         }
1060                         /* IN: 6 wait states before it'll tx */
1061                 }
1062         }
1063
1064 irq_wait:
1065         /* irq handler advances the queue */
1066         if (req != NULL)
1067                 list_add_tail(&req->queue, &ep->queue);
1068         spin_unlock_irqrestore(&udc->lock, flags);
1069
1070         return 0;
1071 }
1072
1073 static int omap_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1074 {
1075         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
1076         struct omap_req *req;
1077         unsigned long   flags;
1078
1079         if (!_ep || !_req)
1080                 return -EINVAL;
1081
1082         spin_lock_irqsave(&ep->udc->lock, flags);
1083
1084         /* make sure it's actually queued on this endpoint */
1085         list_for_each_entry (req, &ep->queue, queue) {
1086                 if (&req->req == _req)
1087                         break;
1088         }
1089         if (&req->req != _req) {
1090                 spin_unlock_irqrestore(&ep->udc->lock, flags);
1091                 return -EINVAL;
1092         }
1093
1094         if (use_dma && ep->dma_channel && ep->queue.next == &req->queue) {
1095                 int channel = ep->dma_channel;
1096
1097                 /* releasing the channel cancels the request,
1098                  * reclaiming the channel restarts the queue
1099                  */
1100                 dma_channel_release(ep);
1101                 dma_channel_claim(ep, channel);
1102         } else
1103                 done(ep, req, -ECONNRESET);
1104         spin_unlock_irqrestore(&ep->udc->lock, flags);
1105         return 0;
1106 }
1107
1108 /*-------------------------------------------------------------------------*/
1109
1110 static int omap_ep_set_halt(struct usb_ep *_ep, int value)
1111 {
1112         struct omap_ep  *ep = container_of(_ep, struct omap_ep, ep);
1113         unsigned long   flags;
1114         int             status = -EOPNOTSUPP;
1115
1116         spin_lock_irqsave(&ep->udc->lock, flags);
1117
1118         /* just use protocol stalls for ep0; real halts are annoying */
1119         if (ep->bEndpointAddress == 0) {
1120                 if (!ep->udc->ep0_pending)
1121                         status = -EINVAL;
1122                 else if (value) {
1123                         if (ep->udc->ep0_set_config) {
1124                                 WARNING("error changing config?\n");
1125                                 omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
1126                         }
1127                         omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
1128                         ep->udc->ep0_pending = 0;
1129                         status = 0;
1130                 } else /* NOP */
1131                         status = 0;
1132
1133         /* otherwise, all active non-ISO endpoints can halt */
1134         } else if (ep->bmAttributes != USB_ENDPOINT_XFER_ISOC && ep->desc) {
1135
1136                 /* IN endpoints must already be idle */
1137                 if ((ep->bEndpointAddress & USB_DIR_IN)
1138                                 && !list_empty(&ep->queue)) {
1139                         status = -EAGAIN;
1140                         goto done;
1141                 }
1142
1143                 if (value) {
1144                         int     channel;
1145
1146                         if (use_dma && ep->dma_channel
1147                                         && !list_empty(&ep->queue)) {
1148                                 channel = ep->dma_channel;
1149                                 dma_channel_release(ep);
1150                         } else
1151                                 channel = 0;
1152
1153                         use_ep(ep, UDC_EP_SEL);
1154                         if (omap_readw(UDC_STAT_FLG) & UDC_NON_ISO_FIFO_EMPTY) {
1155                                 omap_writew(UDC_SET_HALT, UDC_CTRL);
1156                                 status = 0;
1157                         } else
1158                                 status = -EAGAIN;
1159                         deselect_ep();
1160
1161                         if (channel)
1162                                 dma_channel_claim(ep, channel);
1163                 } else {
1164                         use_ep(ep, 0);
1165                         omap_writew(ep->udc->clr_halt, UDC_CTRL);
1166                         ep->ackwait = 0;
1167                         if (!(ep->bEndpointAddress & USB_DIR_IN)) {
1168                                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1169                                 ep->ackwait = 1 + ep->double_buf;
1170                         }
1171                 }
1172         }
1173 done:
1174         VDBG("%s %s halt stat %d\n", ep->ep.name,
1175                 value ? "set" : "clear", status);
1176
1177         spin_unlock_irqrestore(&ep->udc->lock, flags);
1178         return status;
1179 }
1180
1181 static struct usb_ep_ops omap_ep_ops = {
1182         .enable         = omap_ep_enable,
1183         .disable        = omap_ep_disable,
1184
1185         .alloc_request  = omap_alloc_request,
1186         .free_request   = omap_free_request,
1187
1188         .queue          = omap_ep_queue,
1189         .dequeue        = omap_ep_dequeue,
1190
1191         .set_halt       = omap_ep_set_halt,
1192         // fifo_status ... report bytes in fifo
1193         // fifo_flush ... flush fifo
1194 };
1195
1196 /*-------------------------------------------------------------------------*/
1197
1198 static int omap_get_frame(struct usb_gadget *gadget)
1199 {
1200         u16     sof = omap_readw(UDC_SOF);
1201         return (sof & UDC_TS_OK) ? (sof & UDC_TS) : -EL2NSYNC;
1202 }
1203
1204 static int omap_wakeup(struct usb_gadget *gadget)
1205 {
1206         struct omap_udc *udc;
1207         unsigned long   flags;
1208         int             retval = -EHOSTUNREACH;
1209
1210         udc = container_of(gadget, struct omap_udc, gadget);
1211
1212         spin_lock_irqsave(&udc->lock, flags);
1213         if (udc->devstat & UDC_SUS) {
1214                 /* NOTE:  OTG spec erratum says that OTG devices may
1215                  * issue wakeups without host enable.
1216                  */
1217                 if (udc->devstat & (UDC_B_HNP_ENABLE|UDC_R_WK_OK)) {
1218                         DBG("remote wakeup...\n");
1219                         omap_writew(UDC_RMT_WKP, UDC_SYSCON2);
1220                         retval = 0;
1221                 }
1222
1223         /* NOTE:  non-OTG systems may use SRP TOO... */
1224         } else if (!(udc->devstat & UDC_ATT)) {
1225                 if (udc->transceiver)
1226                         retval = otg_start_srp(udc->transceiver);
1227         }
1228         spin_unlock_irqrestore(&udc->lock, flags);
1229
1230         return retval;
1231 }
1232
1233 static int
1234 omap_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
1235 {
1236         struct omap_udc *udc;
1237         unsigned long   flags;
1238         u16             syscon1;
1239
1240         udc = container_of(gadget, struct omap_udc, gadget);
1241         spin_lock_irqsave(&udc->lock, flags);
1242         syscon1 = omap_readw(UDC_SYSCON1);
1243         if (is_selfpowered)
1244                 syscon1 |= UDC_SELF_PWR;
1245         else
1246                 syscon1 &= ~UDC_SELF_PWR;
1247         omap_writew(syscon1, UDC_SYSCON1);
1248         spin_unlock_irqrestore(&udc->lock, flags);
1249
1250         return 0;
1251 }
1252
1253 static int can_pullup(struct omap_udc *udc)
1254 {
1255         return udc->driver && udc->softconnect && udc->vbus_active;
1256 }
1257
1258 static void pullup_enable(struct omap_udc *udc)
1259 {
1260         u16 w;
1261
1262         w = omap_readw(UDC_SYSCON1);
1263         w |= UDC_PULLUP_EN;
1264         omap_writew(w, UDC_SYSCON1);
1265         if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) {
1266                 u32 l;
1267
1268                 l = omap_readl(OTG_CTRL);
1269                 l |= OTG_BSESSVLD;
1270                 omap_writel(l, OTG_CTRL);
1271         }
1272         omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN);
1273 }
1274
1275 static void pullup_disable(struct omap_udc *udc)
1276 {
1277         u16 w;
1278
1279         if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) {
1280                 u32 l;
1281
1282                 l = omap_readl(OTG_CTRL);
1283                 l &= ~OTG_BSESSVLD;
1284                 omap_writel(l, OTG_CTRL);
1285         }
1286         omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN);
1287         w = omap_readw(UDC_SYSCON1);
1288         w &= ~UDC_PULLUP_EN;
1289         omap_writew(w, UDC_SYSCON1);
1290 }
1291
1292 static struct omap_udc *udc;
1293
1294 static void omap_udc_enable_clock(int enable)
1295 {
1296         if (udc == NULL || udc->dc_clk == NULL || udc->hhc_clk == NULL)
1297                 return;
1298
1299         if (enable) {
1300                 clk_enable(udc->dc_clk);
1301                 clk_enable(udc->hhc_clk);
1302                 udelay(100);
1303         } else {
1304                 clk_disable(udc->hhc_clk);
1305                 clk_disable(udc->dc_clk);
1306         }
1307 }
1308
1309 /*
1310  * Called by whatever detects VBUS sessions:  external transceiver
1311  * driver, or maybe GPIO0 VBUS IRQ.  May request 48 MHz clock.
1312  */
1313 static int omap_vbus_session(struct usb_gadget *gadget, int is_active)
1314 {
1315         struct omap_udc *udc;
1316         unsigned long   flags;
1317         u32 l;
1318
1319         udc = container_of(gadget, struct omap_udc, gadget);
1320         spin_lock_irqsave(&udc->lock, flags);
1321         VDBG("VBUS %s\n", is_active ? "on" : "off");
1322         udc->vbus_active = (is_active != 0);
1323         if (cpu_is_omap15xx()) {
1324                 /* "software" detect, ignored if !VBUS_MODE_1510 */
1325                 l = omap_readl(FUNC_MUX_CTRL_0);
1326                 if (is_active)
1327                         l |= VBUS_CTRL_1510;
1328                 else
1329                         l &= ~VBUS_CTRL_1510;
1330                 omap_writel(l, FUNC_MUX_CTRL_0);
1331         }
1332         if (udc->dc_clk != NULL && is_active) {
1333                 if (!udc->clk_requested) {
1334                         omap_udc_enable_clock(1);
1335                         udc->clk_requested = 1;
1336                 }
1337         }
1338         if (can_pullup(udc))
1339                 pullup_enable(udc);
1340         else
1341                 pullup_disable(udc);
1342         if (udc->dc_clk != NULL && !is_active) {
1343                 if (udc->clk_requested) {
1344                         omap_udc_enable_clock(0);
1345                         udc->clk_requested = 0;
1346                 }
1347         }
1348         spin_unlock_irqrestore(&udc->lock, flags);
1349         return 0;
1350 }
1351
1352 static int omap_vbus_draw(struct usb_gadget *gadget, unsigned mA)
1353 {
1354         struct omap_udc *udc;
1355
1356         udc = container_of(gadget, struct omap_udc, gadget);
1357         if (udc->transceiver)
1358                 return otg_set_power(udc->transceiver, mA);
1359         return -EOPNOTSUPP;
1360 }
1361
1362 static int omap_pullup(struct usb_gadget *gadget, int is_on)
1363 {
1364         struct omap_udc *udc;
1365         unsigned long   flags;
1366
1367         udc = container_of(gadget, struct omap_udc, gadget);
1368         spin_lock_irqsave(&udc->lock, flags);
1369         udc->softconnect = (is_on != 0);
1370         if (can_pullup(udc))
1371                 pullup_enable(udc);
1372         else
1373                 pullup_disable(udc);
1374         spin_unlock_irqrestore(&udc->lock, flags);
1375         return 0;
1376 }
1377
1378 static struct usb_gadget_ops omap_gadget_ops = {
1379         .get_frame              = omap_get_frame,
1380         .wakeup                 = omap_wakeup,
1381         .set_selfpowered        = omap_set_selfpowered,
1382         .vbus_session           = omap_vbus_session,
1383         .vbus_draw              = omap_vbus_draw,
1384         .pullup                 = omap_pullup,
1385 };
1386
1387 /*-------------------------------------------------------------------------*/
1388
1389 /* dequeue ALL requests; caller holds udc->lock */
1390 static void nuke(struct omap_ep *ep, int status)
1391 {
1392         struct omap_req *req;
1393
1394         ep->stopped = 1;
1395
1396         if (use_dma && ep->dma_channel)
1397                 dma_channel_release(ep);
1398
1399         use_ep(ep, 0);
1400         omap_writew(UDC_CLR_EP, UDC_CTRL);
1401         if (ep->bEndpointAddress && ep->bmAttributes != USB_ENDPOINT_XFER_ISOC)
1402                 omap_writew(UDC_SET_HALT, UDC_CTRL);
1403
1404         while (!list_empty(&ep->queue)) {
1405                 req = list_entry(ep->queue.next, struct omap_req, queue);
1406                 done(ep, req, status);
1407         }
1408 }
1409
1410 /* caller holds udc->lock */
1411 static void udc_quiesce(struct omap_udc *udc)
1412 {
1413         struct omap_ep  *ep;
1414
1415         udc->gadget.speed = USB_SPEED_UNKNOWN;
1416         nuke(&udc->ep[0], -ESHUTDOWN);
1417         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list)
1418                 nuke(ep, -ESHUTDOWN);
1419 }
1420
1421 /*-------------------------------------------------------------------------*/
1422
1423 static void update_otg(struct omap_udc *udc)
1424 {
1425         u16     devstat;
1426
1427         if (!gadget_is_otg(&udc->gadget))
1428                 return;
1429
1430         if (omap_readl(OTG_CTRL) & OTG_ID)
1431                 devstat = omap_readw(UDC_DEVSTAT);
1432         else
1433                 devstat = 0;
1434
1435         udc->gadget.b_hnp_enable = !!(devstat & UDC_B_HNP_ENABLE);
1436         udc->gadget.a_hnp_support = !!(devstat & UDC_A_HNP_SUPPORT);
1437         udc->gadget.a_alt_hnp_support = !!(devstat & UDC_A_ALT_HNP_SUPPORT);
1438
1439         /* Enable HNP early, avoiding races on suspend irq path.
1440          * ASSUMES OTG state machine B_BUS_REQ input is true.
1441          */
1442         if (udc->gadget.b_hnp_enable) {
1443                 u32 l;
1444
1445                 l = omap_readl(OTG_CTRL);
1446                 l |= OTG_B_HNPEN | OTG_B_BUSREQ;
1447                 l &= ~OTG_PULLUP;
1448                 omap_writel(l, OTG_CTRL);
1449         }
1450 }
1451
1452 static void ep0_irq(struct omap_udc *udc, u16 irq_src)
1453 {
1454         struct omap_ep  *ep0 = &udc->ep[0];
1455         struct omap_req *req = NULL;
1456
1457         ep0->irqs++;
1458
1459         /* Clear any pending requests and then scrub any rx/tx state
1460          * before starting to handle the SETUP request.
1461          */
1462         if (irq_src & UDC_SETUP) {
1463                 u16     ack = irq_src & (UDC_EP0_TX|UDC_EP0_RX);
1464
1465                 nuke(ep0, 0);
1466                 if (ack) {
1467                         omap_writew(ack, UDC_IRQ_SRC);
1468                         irq_src = UDC_SETUP;
1469                 }
1470         }
1471
1472         /* IN/OUT packets mean we're in the DATA or STATUS stage.
1473          * This driver uses only uses protocol stalls (ep0 never halts),
1474          * and if we got this far the gadget driver already had a
1475          * chance to stall.  Tries to be forgiving of host oddities.
1476          *
1477          * NOTE:  the last chance gadget drivers have to stall control
1478          * requests is during their request completion callback.
1479          */
1480         if (!list_empty(&ep0->queue))
1481                 req = container_of(ep0->queue.next, struct omap_req, queue);
1482
1483         /* IN == TX to host */
1484         if (irq_src & UDC_EP0_TX) {
1485                 int     stat;
1486
1487                 omap_writew(UDC_EP0_TX, UDC_IRQ_SRC);
1488                 omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
1489                 stat = omap_readw(UDC_STAT_FLG);
1490                 if (stat & UDC_ACK) {
1491                         if (udc->ep0_in) {
1492                                 /* write next IN packet from response,
1493                                  * or set up the status stage.
1494                                  */
1495                                 if (req)
1496                                         stat = write_fifo(ep0, req);
1497                                 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1498                                 if (!req && udc->ep0_pending) {
1499                                         omap_writew(UDC_EP_SEL, UDC_EP_NUM);
1500                                         omap_writew(UDC_CLR_EP, UDC_CTRL);
1501                                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1502                                         omap_writew(0, UDC_EP_NUM);
1503                                         udc->ep0_pending = 0;
1504                                 } /* else:  6 wait states before it'll tx */
1505                         } else {
1506                                 /* ack status stage of OUT transfer */
1507                                 omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1508                                 if (req)
1509                                         done(ep0, req, 0);
1510                         }
1511                         req = NULL;
1512                 } else if (stat & UDC_STALL) {
1513                         omap_writew(UDC_CLR_HALT, UDC_CTRL);
1514                         omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1515                 } else {
1516                         omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1517                 }
1518         }
1519
1520         /* OUT == RX from host */
1521         if (irq_src & UDC_EP0_RX) {
1522                 int     stat;
1523
1524                 omap_writew(UDC_EP0_RX, UDC_IRQ_SRC);
1525                 omap_writew(UDC_EP_SEL, UDC_EP_NUM);
1526                 stat = omap_readw(UDC_STAT_FLG);
1527                 if (stat & UDC_ACK) {
1528                         if (!udc->ep0_in) {
1529                                 stat = 0;
1530                                 /* read next OUT packet of request, maybe
1531                                  * reactiviting the fifo; stall on errors.
1532                                  */
1533                                 if (!req || (stat = read_fifo(ep0, req)) < 0) {
1534                                         omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
1535                                         udc->ep0_pending = 0;
1536                                         stat = 0;
1537                                 } else if (stat == 0)
1538                                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1539                                 omap_writew(0, UDC_EP_NUM);
1540
1541                                 /* activate status stage */
1542                                 if (stat == 1) {
1543                                         done(ep0, req, 0);
1544                                         /* that may have STALLed ep0... */
1545                                         omap_writew(UDC_EP_SEL | UDC_EP_DIR,
1546                                                         UDC_EP_NUM);
1547                                         omap_writew(UDC_CLR_EP, UDC_CTRL);
1548                                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1549                                         omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1550                                         udc->ep0_pending = 0;
1551                                 }
1552                         } else {
1553                                 /* ack status stage of IN transfer */
1554                                 omap_writew(0, UDC_EP_NUM);
1555                                 if (req)
1556                                         done(ep0, req, 0);
1557                         }
1558                 } else if (stat & UDC_STALL) {
1559                         omap_writew(UDC_CLR_HALT, UDC_CTRL);
1560                         omap_writew(0, UDC_EP_NUM);
1561                 } else {
1562                         omap_writew(0, UDC_EP_NUM);
1563                 }
1564         }
1565
1566         /* SETUP starts all control transfers */
1567         if (irq_src & UDC_SETUP) {
1568                 union u {
1569                         u16                     word[4];
1570                         struct usb_ctrlrequest  r;
1571                 } u;
1572                 int                     status = -EINVAL;
1573                 struct omap_ep          *ep;
1574
1575                 /* read the (latest) SETUP message */
1576                 do {
1577                         omap_writew(UDC_SETUP_SEL, UDC_EP_NUM);
1578                         /* two bytes at a time */
1579                         u.word[0] = omap_readw(UDC_DATA);
1580                         u.word[1] = omap_readw(UDC_DATA);
1581                         u.word[2] = omap_readw(UDC_DATA);
1582                         u.word[3] = omap_readw(UDC_DATA);
1583                         omap_writew(0, UDC_EP_NUM);
1584                 } while (omap_readw(UDC_IRQ_SRC) & UDC_SETUP);
1585
1586 #define w_value         le16_to_cpu(u.r.wValue)
1587 #define w_index         le16_to_cpu(u.r.wIndex)
1588 #define w_length        le16_to_cpu(u.r.wLength)
1589
1590                 /* Delegate almost all control requests to the gadget driver,
1591                  * except for a handful of ch9 status/feature requests that
1592                  * hardware doesn't autodecode _and_ the gadget API hides.
1593                  */
1594                 udc->ep0_in = (u.r.bRequestType & USB_DIR_IN) != 0;
1595                 udc->ep0_set_config = 0;
1596                 udc->ep0_pending = 1;
1597                 ep0->stopped = 0;
1598                 ep0->ackwait = 0;
1599                 switch (u.r.bRequest) {
1600                 case USB_REQ_SET_CONFIGURATION:
1601                         /* udc needs to know when ep != 0 is valid */
1602                         if (u.r.bRequestType != USB_RECIP_DEVICE)
1603                                 goto delegate;
1604                         if (w_length != 0)
1605                                 goto do_stall;
1606                         udc->ep0_set_config = 1;
1607                         udc->ep0_reset_config = (w_value == 0);
1608                         VDBG("set config %d\n", w_value);
1609
1610                         /* update udc NOW since gadget driver may start
1611                          * queueing requests immediately; clear config
1612                          * later if it fails the request.
1613                          */
1614                         if (udc->ep0_reset_config)
1615                                 omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
1616                         else
1617                                 omap_writew(UDC_DEV_CFG, UDC_SYSCON2);
1618                         update_otg(udc);
1619                         goto delegate;
1620                 case USB_REQ_CLEAR_FEATURE:
1621                         /* clear endpoint halt */
1622                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
1623                                 goto delegate;
1624                         if (w_value != USB_ENDPOINT_HALT
1625                                         || w_length != 0)
1626                                 goto do_stall;
1627                         ep = &udc->ep[w_index & 0xf];
1628                         if (ep != ep0) {
1629                                 if (w_index & USB_DIR_IN)
1630                                         ep += 16;
1631                                 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
1632                                                 || !ep->desc)
1633                                         goto do_stall;
1634                                 use_ep(ep, 0);
1635                                 omap_writew(udc->clr_halt, UDC_CTRL);
1636                                 ep->ackwait = 0;
1637                                 if (!(ep->bEndpointAddress & USB_DIR_IN)) {
1638                                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1639                                         ep->ackwait = 1 + ep->double_buf;
1640                                 }
1641                                 /* NOTE:  assumes the host behaves sanely,
1642                                  * only clearing real halts.  Else we may
1643                                  * need to kill pending transfers and then
1644                                  * restart the queue... very messy for DMA!
1645                                  */
1646                         }
1647                         VDBG("%s halt cleared by host\n", ep->name);
1648                         goto ep0out_status_stage;
1649                 case USB_REQ_SET_FEATURE:
1650                         /* set endpoint halt */
1651                         if (u.r.bRequestType != USB_RECIP_ENDPOINT)
1652                                 goto delegate;
1653                         if (w_value != USB_ENDPOINT_HALT
1654                                         || w_length != 0)
1655                                 goto do_stall;
1656                         ep = &udc->ep[w_index & 0xf];
1657                         if (w_index & USB_DIR_IN)
1658                                 ep += 16;
1659                         if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
1660                                         || ep == ep0 || !ep->desc)
1661                                 goto do_stall;
1662                         if (use_dma && ep->has_dma) {
1663                                 /* this has rude side-effects (aborts) and
1664                                  * can't really work if DMA-IN is active
1665                                  */
1666                                 DBG("%s host set_halt, NYET \n", ep->name);
1667                                 goto do_stall;
1668                         }
1669                         use_ep(ep, 0);
1670                         /* can't halt if fifo isn't empty... */
1671                         omap_writew(UDC_CLR_EP, UDC_CTRL);
1672                         omap_writew(UDC_SET_HALT, UDC_CTRL);
1673                         VDBG("%s halted by host\n", ep->name);
1674 ep0out_status_stage:
1675                         status = 0;
1676                         omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
1677                         omap_writew(UDC_CLR_EP, UDC_CTRL);
1678                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1679                         omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1680                         udc->ep0_pending = 0;
1681                         break;
1682                 case USB_REQ_GET_STATUS:
1683                         /* USB_ENDPOINT_HALT status? */
1684                         if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
1685                                 goto intf_status;
1686
1687                         /* ep0 never stalls */
1688                         if (!(w_index & 0xf))
1689                                 goto zero_status;
1690
1691                         /* only active endpoints count */
1692                         ep = &udc->ep[w_index & 0xf];
1693                         if (w_index & USB_DIR_IN)
1694                                 ep += 16;
1695                         if (!ep->desc)
1696                                 goto do_stall;
1697
1698                         /* iso never stalls */
1699                         if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
1700                                 goto zero_status;
1701
1702                         /* FIXME don't assume non-halted endpoints!! */
1703                         ERR("%s status, can't report\n", ep->ep.name);
1704                         goto do_stall;
1705
1706 intf_status:
1707                         /* return interface status.  if we were pedantic,
1708                          * we'd detect non-existent interfaces, and stall.
1709                          */
1710                         if (u.r.bRequestType
1711                                         != (USB_DIR_IN|USB_RECIP_INTERFACE))
1712                                 goto delegate;
1713
1714 zero_status:
1715                         /* return two zero bytes */
1716                         omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
1717                         omap_writew(0, UDC_DATA);
1718                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1719                         omap_writew(UDC_EP_DIR, UDC_EP_NUM);
1720                         status = 0;
1721                         VDBG("GET_STATUS, interface %d\n", w_index);
1722                         /* next, status stage */
1723                         break;
1724                 default:
1725 delegate:
1726                         /* activate the ep0out fifo right away */
1727                         if (!udc->ep0_in && w_length) {
1728                                 omap_writew(0, UDC_EP_NUM);
1729                                 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1730                         }
1731
1732                         /* gadget drivers see class/vendor specific requests,
1733                          * {SET,GET}_{INTERFACE,DESCRIPTOR,CONFIGURATION},
1734                          * and more
1735                          */
1736                         VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1737                                 u.r.bRequestType, u.r.bRequest,
1738                                 w_value, w_index, w_length);
1739
1740 #undef  w_value
1741 #undef  w_index
1742 #undef  w_length
1743
1744                         /* The gadget driver may return an error here,
1745                          * causing an immediate protocol stall.
1746                          *
1747                          * Else it must issue a response, either queueing a
1748                          * response buffer for the DATA stage, or halting ep0
1749                          * (causing a protocol stall, not a real halt).  A
1750                          * zero length buffer means no DATA stage.
1751                          *
1752                          * It's fine to issue that response after the setup()
1753                          * call returns, and this IRQ was handled.
1754                          */
1755                         udc->ep0_setup = 1;
1756                         spin_unlock(&udc->lock);
1757                         status = udc->driver->setup (&udc->gadget, &u.r);
1758                         spin_lock(&udc->lock);
1759                         udc->ep0_setup = 0;
1760                 }
1761
1762                 if (status < 0) {
1763 do_stall:
1764                         VDBG("req %02x.%02x protocol STALL; stat %d\n",
1765                                         u.r.bRequestType, u.r.bRequest, status);
1766                         if (udc->ep0_set_config) {
1767                                 if (udc->ep0_reset_config)
1768                                         WARNING("error resetting config?\n");
1769                                 else
1770                                         omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
1771                         }
1772                         omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
1773                         udc->ep0_pending = 0;
1774                 }
1775         }
1776 }
1777
1778 /*-------------------------------------------------------------------------*/
1779
1780 #define OTG_FLAGS (UDC_B_HNP_ENABLE|UDC_A_HNP_SUPPORT|UDC_A_ALT_HNP_SUPPORT)
1781
1782 static void devstate_irq(struct omap_udc *udc, u16 irq_src)
1783 {
1784         u16     devstat, change;
1785
1786         devstat = omap_readw(UDC_DEVSTAT);
1787         change = devstat ^ udc->devstat;
1788         udc->devstat = devstat;
1789
1790         if (change & (UDC_USB_RESET|UDC_ATT)) {
1791                 udc_quiesce(udc);
1792
1793                 if (change & UDC_ATT) {
1794                         /* driver for any external transceiver will
1795                          * have called omap_vbus_session() already
1796                          */
1797                         if (devstat & UDC_ATT) {
1798                                 udc->gadget.speed = USB_SPEED_FULL;
1799                                 VDBG("connect\n");
1800                                 if (!udc->transceiver)
1801                                         pullup_enable(udc);
1802                                 // if (driver->connect) call it
1803                         } else if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
1804                                 udc->gadget.speed = USB_SPEED_UNKNOWN;
1805                                 if (!udc->transceiver)
1806                                         pullup_disable(udc);
1807                                 DBG("disconnect, gadget %s\n",
1808                                         udc->driver->driver.name);
1809                                 if (udc->driver->disconnect) {
1810                                         spin_unlock(&udc->lock);
1811                                         udc->driver->disconnect(&udc->gadget);
1812                                         spin_lock(&udc->lock);
1813                                 }
1814                         }
1815                         change &= ~UDC_ATT;
1816                 }
1817
1818                 if (change & UDC_USB_RESET) {
1819                         if (devstat & UDC_USB_RESET) {
1820                                 VDBG("RESET=1\n");
1821                         } else {
1822                                 udc->gadget.speed = USB_SPEED_FULL;
1823                                 INFO("USB reset done, gadget %s\n",
1824                                         udc->driver->driver.name);
1825                                 /* ep0 traffic is legal from now on */
1826                                 omap_writew(UDC_DS_CHG_IE | UDC_EP0_IE,
1827                                                 UDC_IRQ_EN);
1828                         }
1829                         change &= ~UDC_USB_RESET;
1830                 }
1831         }
1832         if (change & UDC_SUS) {
1833                 if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
1834                         // FIXME tell isp1301 to suspend/resume (?)
1835                         if (devstat & UDC_SUS) {
1836                                 VDBG("suspend\n");
1837                                 update_otg(udc);
1838                                 /* HNP could be under way already */
1839                                 if (udc->gadget.speed == USB_SPEED_FULL
1840                                                 && udc->driver->suspend) {
1841                                         spin_unlock(&udc->lock);
1842                                         udc->driver->suspend(&udc->gadget);
1843                                         spin_lock(&udc->lock);
1844                                 }
1845                                 if (udc->transceiver)
1846                                         otg_set_suspend(udc->transceiver, 1);
1847                         } else {
1848                                 VDBG("resume\n");
1849                                 if (udc->transceiver)
1850                                         otg_set_suspend(udc->transceiver, 0);
1851                                 if (udc->gadget.speed == USB_SPEED_FULL
1852                                                 && udc->driver->resume) {
1853                                         spin_unlock(&udc->lock);
1854                                         udc->driver->resume(&udc->gadget);
1855                                         spin_lock(&udc->lock);
1856                                 }
1857                         }
1858                 }
1859                 change &= ~UDC_SUS;
1860         }
1861         if (!cpu_is_omap15xx() && (change & OTG_FLAGS)) {
1862                 update_otg(udc);
1863                 change &= ~OTG_FLAGS;
1864         }
1865
1866         change &= ~(UDC_CFG|UDC_DEF|UDC_ADD);
1867         if (change)
1868                 VDBG("devstat %03x, ignore change %03x\n",
1869                         devstat,  change);
1870
1871         omap_writew(UDC_DS_CHG, UDC_IRQ_SRC);
1872 }
1873
1874 static irqreturn_t omap_udc_irq(int irq, void *_udc)
1875 {
1876         struct omap_udc *udc = _udc;
1877         u16             irq_src;
1878         irqreturn_t     status = IRQ_NONE;
1879         unsigned long   flags;
1880
1881         spin_lock_irqsave(&udc->lock, flags);
1882         irq_src = omap_readw(UDC_IRQ_SRC);
1883
1884         /* Device state change (usb ch9 stuff) */
1885         if (irq_src & UDC_DS_CHG) {
1886                 devstate_irq(_udc, irq_src);
1887                 status = IRQ_HANDLED;
1888                 irq_src &= ~UDC_DS_CHG;
1889         }
1890
1891         /* EP0 control transfers */
1892         if (irq_src & (UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX)) {
1893                 ep0_irq(_udc, irq_src);
1894                 status = IRQ_HANDLED;
1895                 irq_src &= ~(UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX);
1896         }
1897
1898         /* DMA transfer completion */
1899         if (use_dma && (irq_src & (UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT))) {
1900                 dma_irq(_udc, irq_src);
1901                 status = IRQ_HANDLED;
1902                 irq_src &= ~(UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT);
1903         }
1904
1905         irq_src &= ~(UDC_IRQ_SOF | UDC_EPN_TX|UDC_EPN_RX);
1906         if (irq_src)
1907                 DBG("udc_irq, unhandled %03x\n", irq_src);
1908         spin_unlock_irqrestore(&udc->lock, flags);
1909
1910         return status;
1911 }
1912
1913 /* workaround for seemingly-lost IRQs for RX ACKs... */
1914 #define PIO_OUT_TIMEOUT (jiffies + HZ/3)
1915 #define HALF_FULL(f)    (!((f)&(UDC_NON_ISO_FIFO_FULL|UDC_NON_ISO_FIFO_EMPTY)))
1916
1917 static void pio_out_timer(unsigned long _ep)
1918 {
1919         struct omap_ep  *ep = (void *) _ep;
1920         unsigned long   flags;
1921         u16             stat_flg;
1922
1923         spin_lock_irqsave(&ep->udc->lock, flags);
1924         if (!list_empty(&ep->queue) && ep->ackwait) {
1925                 use_ep(ep, UDC_EP_SEL);
1926                 stat_flg = omap_readw(UDC_STAT_FLG);
1927
1928                 if ((stat_flg & UDC_ACK) && (!(stat_flg & UDC_FIFO_EN)
1929                                 || (ep->double_buf && HALF_FULL(stat_flg)))) {
1930                         struct omap_req *req;
1931
1932                         VDBG("%s: lose, %04x\n", ep->ep.name, stat_flg);
1933                         req = container_of(ep->queue.next,
1934                                         struct omap_req, queue);
1935                         (void) read_fifo(ep, req);
1936                         omap_writew(ep->bEndpointAddress, UDC_EP_NUM);
1937                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1938                         ep->ackwait = 1 + ep->double_buf;
1939                 } else
1940                         deselect_ep();
1941         }
1942         mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
1943         spin_unlock_irqrestore(&ep->udc->lock, flags);
1944 }
1945
1946 static irqreturn_t omap_udc_pio_irq(int irq, void *_dev)
1947 {
1948         u16             epn_stat, irq_src;
1949         irqreturn_t     status = IRQ_NONE;
1950         struct omap_ep  *ep;
1951         int             epnum;
1952         struct omap_udc *udc = _dev;
1953         struct omap_req *req;
1954         unsigned long   flags;
1955
1956         spin_lock_irqsave(&udc->lock, flags);
1957         epn_stat = omap_readw(UDC_EPN_STAT);
1958         irq_src = omap_readw(UDC_IRQ_SRC);
1959
1960         /* handle OUT first, to avoid some wasteful NAKs */
1961         if (irq_src & UDC_EPN_RX) {
1962                 epnum = (epn_stat >> 8) & 0x0f;
1963                 omap_writew(UDC_EPN_RX, UDC_IRQ_SRC);
1964                 status = IRQ_HANDLED;
1965                 ep = &udc->ep[epnum];
1966                 ep->irqs++;
1967
1968                 omap_writew(epnum | UDC_EP_SEL, UDC_EP_NUM);
1969                 ep->fnf = 0;
1970                 if (omap_readw(UDC_STAT_FLG) & UDC_ACK) {
1971                         ep->ackwait--;
1972                         if (!list_empty(&ep->queue)) {
1973                                 int stat;
1974                                 req = container_of(ep->queue.next,
1975                                                 struct omap_req, queue);
1976                                 stat = read_fifo(ep, req);
1977                                 if (!ep->double_buf)
1978                                         ep->fnf = 1;
1979                         }
1980                 }
1981                 /* min 6 clock delay before clearing EP_SEL ... */
1982                 epn_stat = omap_readw(UDC_EPN_STAT);
1983                 epn_stat = omap_readw(UDC_EPN_STAT);
1984                 omap_writew(epnum, UDC_EP_NUM);
1985
1986                 /* enabling fifo _after_ clearing ACK, contrary to docs,
1987                  * reduces lossage; timer still needed though (sigh).
1988                  */
1989                 if (ep->fnf) {
1990                         omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
1991                         ep->ackwait = 1 + ep->double_buf;
1992                 }
1993                 mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
1994         }
1995
1996         /* then IN transfers */
1997         else if (irq_src & UDC_EPN_TX) {
1998                 epnum = epn_stat & 0x0f;
1999                 omap_writew(UDC_EPN_TX, UDC_IRQ_SRC);
2000                 status = IRQ_HANDLED;
2001                 ep = &udc->ep[16 + epnum];
2002                 ep->irqs++;
2003
2004                 omap_writew(epnum | UDC_EP_DIR | UDC_EP_SEL, UDC_EP_NUM);
2005                 if (omap_readw(UDC_STAT_FLG) & UDC_ACK) {
2006                         ep->ackwait = 0;
2007                         if (!list_empty(&ep->queue)) {
2008                                 req = container_of(ep->queue.next,
2009                                                 struct omap_req, queue);
2010                                 (void) write_fifo(ep, req);
2011                         }
2012                 }
2013                 /* min 6 clock delay before clearing EP_SEL ... */
2014                 epn_stat = omap_readw(UDC_EPN_STAT);
2015                 epn_stat = omap_readw(UDC_EPN_STAT);
2016                 omap_writew(epnum | UDC_EP_DIR, UDC_EP_NUM);
2017                 /* then 6 clocks before it'd tx */
2018         }
2019
2020         spin_unlock_irqrestore(&udc->lock, flags);
2021         return status;
2022 }
2023
2024 #ifdef  USE_ISO
2025 static irqreturn_t omap_udc_iso_irq(int irq, void *_dev)
2026 {
2027         struct omap_udc *udc = _dev;
2028         struct omap_ep  *ep;
2029         int             pending = 0;
2030         unsigned long   flags;
2031
2032         spin_lock_irqsave(&udc->lock, flags);
2033
2034         /* handle all non-DMA ISO transfers */
2035         list_for_each_entry (ep, &udc->iso, iso) {
2036                 u16             stat;
2037                 struct omap_req *req;
2038
2039                 if (ep->has_dma || list_empty(&ep->queue))
2040                         continue;
2041                 req = list_entry(ep->queue.next, struct omap_req, queue);
2042
2043                 use_ep(ep, UDC_EP_SEL);
2044                 stat = omap_readw(UDC_STAT_FLG);
2045
2046                 /* NOTE: like the other controller drivers, this isn't
2047                  * currently reporting lost or damaged frames.
2048                  */
2049                 if (ep->bEndpointAddress & USB_DIR_IN) {
2050                         if (stat & UDC_MISS_IN)
2051                                 /* done(ep, req, -EPROTO) */;
2052                         else
2053                                 write_fifo(ep, req);
2054                 } else {
2055                         int     status = 0;
2056
2057                         if (stat & UDC_NO_RXPACKET)
2058                                 status = -EREMOTEIO;
2059                         else if (stat & UDC_ISO_ERR)
2060                                 status = -EILSEQ;
2061                         else if (stat & UDC_DATA_FLUSH)
2062                                 status = -ENOSR;
2063
2064                         if (status)
2065                                 /* done(ep, req, status) */;
2066                         else
2067                                 read_fifo(ep, req);
2068                 }
2069                 deselect_ep();
2070                 /* 6 wait states before next EP */
2071
2072                 ep->irqs++;
2073                 if (!list_empty(&ep->queue))
2074                         pending = 1;
2075         }
2076         if (!pending) {
2077                 u16 w;
2078
2079                 w = omap_readw(UDC_IRQ_EN);
2080                 w &= ~UDC_SOF_IE;
2081                 omap_writew(w, UDC_IRQ_EN);
2082         }
2083         omap_writew(UDC_IRQ_SOF, UDC_IRQ_SRC);
2084
2085         spin_unlock_irqrestore(&udc->lock, flags);
2086         return IRQ_HANDLED;
2087 }
2088 #endif
2089
2090 /*-------------------------------------------------------------------------*/
2091
2092 static inline int machine_without_vbus_sense(void)
2093 {
2094         return (machine_is_omap_innovator()
2095                 || machine_is_omap_osk()
2096                 || machine_is_omap_apollon()
2097 #ifndef CONFIG_MACH_OMAP_H4_OTG
2098                 || machine_is_omap_h4()
2099 #endif
2100                 || machine_is_sx1()
2101                 );
2102 }
2103
2104 int usb_gadget_register_driver (struct usb_gadget_driver *driver)
2105 {
2106         int             status = -ENODEV;
2107         struct omap_ep  *ep;
2108         unsigned long   flags;
2109
2110         /* basic sanity tests */
2111         if (!udc)
2112                 return -ENODEV;
2113         if (!driver
2114                         // FIXME if otg, check:  driver->is_otg
2115                         || driver->speed < USB_SPEED_FULL
2116                         || !driver->bind
2117                         || !driver->setup)
2118                 return -EINVAL;
2119
2120         spin_lock_irqsave(&udc->lock, flags);
2121         if (udc->driver) {
2122                 spin_unlock_irqrestore(&udc->lock, flags);
2123                 return -EBUSY;
2124         }
2125
2126         /* reset state */
2127         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
2128                 ep->irqs = 0;
2129                 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
2130                         continue;
2131                 use_ep(ep, 0);
2132                 omap_writew(UDC_SET_HALT, UDC_CTRL);
2133         }
2134         udc->ep0_pending = 0;
2135         udc->ep[0].irqs = 0;
2136         udc->softconnect = 1;
2137
2138         /* hook up the driver */
2139         driver->driver.bus = NULL;
2140         udc->driver = driver;
2141         udc->gadget.dev.driver = &driver->driver;
2142         spin_unlock_irqrestore(&udc->lock, flags);
2143
2144         if (udc->dc_clk != NULL)
2145                 omap_udc_enable_clock(1);
2146
2147         status = driver->bind (&udc->gadget);
2148         if (status) {
2149                 DBG("bind to %s --> %d\n", driver->driver.name, status);
2150                 udc->gadget.dev.driver = NULL;
2151                 udc->driver = NULL;
2152                 goto done;
2153         }
2154         DBG("bound to driver %s\n", driver->driver.name);
2155
2156         omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
2157
2158         /* connect to bus through transceiver */
2159         if (udc->transceiver) {
2160                 status = otg_set_peripheral(udc->transceiver, &udc->gadget);
2161                 if (status < 0) {
2162                         ERR("can't bind to transceiver\n");
2163                         if (driver->unbind) {
2164                                 driver->unbind (&udc->gadget);
2165                                 udc->gadget.dev.driver = NULL;
2166                                 udc->driver = NULL;
2167                         }
2168                         goto done;
2169                 }
2170         } else {
2171                 if (can_pullup(udc))
2172                         pullup_enable (udc);
2173                 else
2174                         pullup_disable (udc);
2175         }
2176
2177         /* boards that don't have VBUS sensing can't autogate 48MHz;
2178          * can't enter deep sleep while a gadget driver is active.
2179          */
2180         if (machine_without_vbus_sense())
2181                 omap_vbus_session(&udc->gadget, 1);
2182
2183 done:
2184         if (udc->dc_clk != NULL)
2185                 omap_udc_enable_clock(0);
2186         return status;
2187 }
2188 EXPORT_SYMBOL(usb_gadget_register_driver);
2189
2190 int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
2191 {
2192         unsigned long   flags;
2193         int             status = -ENODEV;
2194
2195         if (!udc)
2196                 return -ENODEV;
2197         if (!driver || driver != udc->driver || !driver->unbind)
2198                 return -EINVAL;
2199
2200         if (udc->dc_clk != NULL)
2201                 omap_udc_enable_clock(1);
2202
2203         if (machine_without_vbus_sense())
2204                 omap_vbus_session(&udc->gadget, 0);
2205
2206         if (udc->transceiver)
2207                 (void) otg_set_peripheral(udc->transceiver, NULL);
2208         else
2209                 pullup_disable(udc);
2210
2211         spin_lock_irqsave(&udc->lock, flags);
2212         udc_quiesce(udc);
2213         spin_unlock_irqrestore(&udc->lock, flags);
2214
2215         driver->unbind(&udc->gadget);
2216         udc->gadget.dev.driver = NULL;
2217         udc->driver = NULL;
2218
2219         if (udc->dc_clk != NULL)
2220                 omap_udc_enable_clock(0);
2221         DBG("unregistered driver '%s'\n", driver->driver.name);
2222         return status;
2223 }
2224 EXPORT_SYMBOL(usb_gadget_unregister_driver);
2225
2226
2227 /*-------------------------------------------------------------------------*/
2228
2229 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
2230
2231 #include <linux/seq_file.h>
2232
2233 static const char proc_filename[] = "driver/udc";
2234
2235 #define FOURBITS "%s%s%s%s"
2236 #define EIGHTBITS FOURBITS FOURBITS
2237
2238 static void proc_ep_show(struct seq_file *s, struct omap_ep *ep)
2239 {
2240         u16             stat_flg;
2241         struct omap_req *req;
2242         char            buf[20];
2243
2244         use_ep(ep, 0);
2245
2246         if (use_dma && ep->has_dma)
2247                 snprintf(buf, sizeof buf, "(%cxdma%d lch%d) ",
2248                         (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r',
2249                         ep->dma_channel - 1, ep->lch);
2250         else
2251                 buf[0] = 0;
2252
2253         stat_flg = omap_readw(UDC_STAT_FLG);
2254         seq_printf(s,
2255                 "\n%s %s%s%sirqs %ld stat %04x " EIGHTBITS FOURBITS "%s\n",
2256                 ep->name, buf,
2257                 ep->double_buf ? "dbuf " : "",
2258                 ({char *s; switch(ep->ackwait){
2259                 case 0: s = ""; break;
2260                 case 1: s = "(ackw) "; break;
2261                 case 2: s = "(ackw2) "; break;
2262                 default: s = "(?) "; break;
2263                 } s;}),
2264                 ep->irqs, stat_flg,
2265                 (stat_flg & UDC_NO_RXPACKET) ? "no_rxpacket " : "",
2266                 (stat_flg & UDC_MISS_IN) ? "miss_in " : "",
2267                 (stat_flg & UDC_DATA_FLUSH) ? "data_flush " : "",
2268                 (stat_flg & UDC_ISO_ERR) ? "iso_err " : "",
2269                 (stat_flg & UDC_ISO_FIFO_EMPTY) ? "iso_fifo_empty " : "",
2270                 (stat_flg & UDC_ISO_FIFO_FULL) ? "iso_fifo_full " : "",
2271                 (stat_flg & UDC_EP_HALTED) ? "HALT " : "",
2272                 (stat_flg & UDC_STALL) ? "STALL " : "",
2273                 (stat_flg & UDC_NAK) ? "NAK " : "",
2274                 (stat_flg & UDC_ACK) ? "ACK " : "",
2275                 (stat_flg & UDC_FIFO_EN) ? "fifo_en " : "",
2276                 (stat_flg & UDC_NON_ISO_FIFO_EMPTY) ? "fifo_empty " : "",
2277                 (stat_flg & UDC_NON_ISO_FIFO_FULL) ? "fifo_full " : "");
2278
2279         if (list_empty (&ep->queue))
2280                 seq_printf(s, "\t(queue empty)\n");
2281         else
2282                 list_for_each_entry (req, &ep->queue, queue) {
2283                         unsigned        length = req->req.actual;
2284
2285                         if (use_dma && buf[0]) {
2286                                 length += ((ep->bEndpointAddress & USB_DIR_IN)
2287                                                 ? dma_src_len : dma_dest_len)
2288                                         (ep, req->req.dma + length);
2289                                 buf[0] = 0;
2290                         }
2291                         seq_printf(s, "\treq %p len %d/%d buf %p\n",
2292                                         &req->req, length,
2293                                         req->req.length, req->req.buf);
2294                 }
2295 }
2296
2297 static char *trx_mode(unsigned m, int enabled)
2298 {
2299         switch (m) {
2300         case 0:         return enabled ? "*6wire" : "unused";
2301         case 1:         return "4wire";
2302         case 2:         return "3wire";
2303         case 3:         return "6wire";
2304         default:        return "unknown";
2305         }
2306 }
2307
2308 static int proc_otg_show(struct seq_file *s)
2309 {
2310         u32             tmp;
2311         u32             trans;
2312         char            *ctrl_name;
2313
2314         tmp = omap_readl(OTG_REV);
2315         if (cpu_is_omap24xx()) {
2316                 ctrl_name = "control_devconf";
2317                 trans = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
2318         } else {
2319                 ctrl_name = "tranceiver_ctrl";
2320                 trans = omap_readw(USB_TRANSCEIVER_CTRL);
2321         }
2322         seq_printf(s, "\nOTG rev %d.%d, %s %05x\n",
2323                 tmp >> 4, tmp & 0xf, ctrl_name, trans);
2324         tmp = omap_readw(OTG_SYSCON_1);
2325         seq_printf(s, "otg_syscon1 %08x usb2 %s, usb1 %s, usb0 %s,"
2326                         FOURBITS "\n", tmp,
2327                 trx_mode(USB2_TRX_MODE(tmp), trans & CONF_USB2_UNI_R),
2328                 trx_mode(USB1_TRX_MODE(tmp), trans & CONF_USB1_UNI_R),
2329                 (USB0_TRX_MODE(tmp) == 0 && !cpu_is_omap1710())
2330                         ? "internal"
2331                         : trx_mode(USB0_TRX_MODE(tmp), 1),
2332                 (tmp & OTG_IDLE_EN) ? " !otg" : "",
2333                 (tmp & HST_IDLE_EN) ? " !host" : "",
2334                 (tmp & DEV_IDLE_EN) ? " !dev" : "",
2335                 (tmp & OTG_RESET_DONE) ? " reset_done" : " reset_active");
2336         tmp = omap_readl(OTG_SYSCON_2);
2337         seq_printf(s, "otg_syscon2 %08x%s" EIGHTBITS
2338                         " b_ase_brst=%d hmc=%d\n", tmp,
2339                 (tmp & OTG_EN) ? " otg_en" : "",
2340                 (tmp & USBX_SYNCHRO) ? " synchro" : "",
2341                 // much more SRP stuff
2342                 (tmp & SRP_DATA) ? " srp_data" : "",
2343                 (tmp & SRP_VBUS) ? " srp_vbus" : "",
2344                 (tmp & OTG_PADEN) ? " otg_paden" : "",
2345                 (tmp & HMC_PADEN) ? " hmc_paden" : "",
2346                 (tmp & UHOST_EN) ? " uhost_en" : "",
2347                 (tmp & HMC_TLLSPEED) ? " tllspeed" : "",
2348                 (tmp & HMC_TLLATTACH) ? " tllattach" : "",
2349                 B_ASE_BRST(tmp),
2350                 OTG_HMC(tmp));
2351         tmp = omap_readl(OTG_CTRL);
2352         seq_printf(s, "otg_ctrl    %06x" EIGHTBITS EIGHTBITS "%s\n", tmp,
2353                 (tmp & OTG_ASESSVLD) ? " asess" : "",
2354                 (tmp & OTG_BSESSEND) ? " bsess_end" : "",
2355                 (tmp & OTG_BSESSVLD) ? " bsess" : "",
2356                 (tmp & OTG_VBUSVLD) ? " vbus" : "",
2357                 (tmp & OTG_ID) ? " id" : "",
2358                 (tmp & OTG_DRIVER_SEL) ? " DEVICE" : " HOST",
2359                 (tmp & OTG_A_SETB_HNPEN) ? " a_setb_hnpen" : "",
2360                 (tmp & OTG_A_BUSREQ) ? " a_bus" : "",
2361                 (tmp & OTG_B_HNPEN) ? " b_hnpen" : "",
2362                 (tmp & OTG_B_BUSREQ) ? " b_bus" : "",
2363                 (tmp & OTG_BUSDROP) ? " busdrop" : "",
2364                 (tmp & OTG_PULLDOWN) ? " down" : "",
2365                 (tmp & OTG_PULLUP) ? " up" : "",
2366                 (tmp & OTG_DRV_VBUS) ? " drv" : "",
2367                 (tmp & OTG_PD_VBUS) ? " pd_vb" : "",
2368                 (tmp & OTG_PU_VBUS) ? " pu_vb" : "",
2369                 (tmp & OTG_PU_ID) ? " pu_id" : ""
2370                 );
2371         tmp = omap_readw(OTG_IRQ_EN);
2372         seq_printf(s, "otg_irq_en  %04x" "\n", tmp);
2373         tmp = omap_readw(OTG_IRQ_SRC);
2374         seq_printf(s, "otg_irq_src %04x" "\n", tmp);
2375         tmp = omap_readw(OTG_OUTCTRL);
2376         seq_printf(s, "otg_outctrl %04x" "\n", tmp);
2377         tmp = omap_readw(OTG_TEST);
2378         seq_printf(s, "otg_test    %04x" "\n", tmp);
2379         return 0;
2380 }
2381
2382 static int proc_udc_show(struct seq_file *s, void *_)
2383 {
2384         u32             tmp;
2385         struct omap_ep  *ep;
2386         unsigned long   flags;
2387
2388         spin_lock_irqsave(&udc->lock, flags);
2389
2390         seq_printf(s, "%s, version: " DRIVER_VERSION
2391 #ifdef  USE_ISO
2392                 " (iso)"
2393 #endif
2394                 "%s\n",
2395                 driver_desc,
2396                 use_dma ?  " (dma)" : "");
2397
2398         tmp = omap_readw(UDC_REV) & 0xff;
2399         seq_printf(s,
2400                 "UDC rev %d.%d, fifo mode %d, gadget %s\n"
2401                 "hmc %d, transceiver %s\n",
2402                 tmp >> 4, tmp & 0xf,
2403                 fifo_mode,
2404                 udc->driver ? udc->driver->driver.name : "(none)",
2405                 HMC,
2406                 udc->transceiver
2407                         ? udc->transceiver->label
2408                         : ((cpu_is_omap1710() || cpu_is_omap24xx())
2409                                 ? "external" : "(none)"));
2410         if (cpu_class_is_omap1()) {
2411                 seq_printf(s, "ULPD control %04x req %04x status %04x\n",
2412                         omap_readw(ULPD_CLOCK_CTRL),
2413                         omap_readw(ULPD_SOFT_REQ),
2414                         omap_readw(ULPD_STATUS_REQ));
2415         }
2416
2417         /* OTG controller registers */
2418         if (!cpu_is_omap15xx())
2419                 proc_otg_show(s);
2420
2421         tmp = omap_readw(UDC_SYSCON1);
2422         seq_printf(s, "\nsyscon1     %04x" EIGHTBITS "\n", tmp,
2423                 (tmp & UDC_CFG_LOCK) ? " cfg_lock" : "",
2424                 (tmp & UDC_DATA_ENDIAN) ? " data_endian" : "",
2425                 (tmp & UDC_DMA_ENDIAN) ? " dma_endian" : "",
2426                 (tmp & UDC_NAK_EN) ? " nak" : "",
2427                 (tmp & UDC_AUTODECODE_DIS) ? " autodecode_dis" : "",
2428                 (tmp & UDC_SELF_PWR) ? " self_pwr" : "",
2429                 (tmp & UDC_SOFF_DIS) ? " soff_dis" : "",
2430                 (tmp & UDC_PULLUP_EN) ? " PULLUP" : "");
2431         // syscon2 is write-only
2432
2433         /* UDC controller registers */
2434         if (!(tmp & UDC_PULLUP_EN)) {
2435                 seq_printf(s, "(suspended)\n");
2436                 spin_unlock_irqrestore(&udc->lock, flags);
2437                 return 0;
2438         }
2439
2440         tmp = omap_readw(UDC_DEVSTAT);
2441         seq_printf(s, "devstat     %04x" EIGHTBITS "%s%s\n", tmp,
2442                 (tmp & UDC_B_HNP_ENABLE) ? " b_hnp" : "",
2443                 (tmp & UDC_A_HNP_SUPPORT) ? " a_hnp" : "",
2444                 (tmp & UDC_A_ALT_HNP_SUPPORT) ? " a_alt_hnp" : "",
2445                 (tmp & UDC_R_WK_OK) ? " r_wk_ok" : "",
2446                 (tmp & UDC_USB_RESET) ? " usb_reset" : "",
2447                 (tmp & UDC_SUS) ? " SUS" : "",
2448                 (tmp & UDC_CFG) ? " CFG" : "",
2449                 (tmp & UDC_ADD) ? " ADD" : "",
2450                 (tmp & UDC_DEF) ? " DEF" : "",
2451                 (tmp & UDC_ATT) ? " ATT" : "");
2452         seq_printf(s, "sof         %04x\n", omap_readw(UDC_SOF));
2453         tmp = omap_readw(UDC_IRQ_EN);
2454         seq_printf(s, "irq_en      %04x" FOURBITS "%s\n", tmp,
2455                 (tmp & UDC_SOF_IE) ? " sof" : "",
2456                 (tmp & UDC_EPN_RX_IE) ? " epn_rx" : "",
2457                 (tmp & UDC_EPN_TX_IE) ? " epn_tx" : "",
2458                 (tmp & UDC_DS_CHG_IE) ? " ds_chg" : "",
2459                 (tmp & UDC_EP0_IE) ? " ep0" : "");
2460         tmp = omap_readw(UDC_IRQ_SRC);
2461         seq_printf(s, "irq_src     %04x" EIGHTBITS "%s%s\n", tmp,
2462                 (tmp & UDC_TXN_DONE) ? " txn_done" : "",
2463                 (tmp & UDC_RXN_CNT) ? " rxn_cnt" : "",
2464                 (tmp & UDC_RXN_EOT) ? " rxn_eot" : "",
2465                 (tmp & UDC_IRQ_SOF) ? " sof" : "",
2466                 (tmp & UDC_EPN_RX) ? " epn_rx" : "",
2467                 (tmp & UDC_EPN_TX) ? " epn_tx" : "",
2468                 (tmp & UDC_DS_CHG) ? " ds_chg" : "",
2469                 (tmp & UDC_SETUP) ? " setup" : "",
2470                 (tmp & UDC_EP0_RX) ? " ep0out" : "",
2471                 (tmp & UDC_EP0_TX) ? " ep0in" : "");
2472         if (use_dma) {
2473                 unsigned i;
2474
2475                 tmp = omap_readw(UDC_DMA_IRQ_EN);
2476                 seq_printf(s, "dma_irq_en  %04x%s" EIGHTBITS "\n", tmp,
2477                         (tmp & UDC_TX_DONE_IE(3)) ? " tx2_done" : "",
2478                         (tmp & UDC_RX_CNT_IE(3)) ? " rx2_cnt" : "",
2479                         (tmp & UDC_RX_EOT_IE(3)) ? " rx2_eot" : "",
2480
2481                         (tmp & UDC_TX_DONE_IE(2)) ? " tx1_done" : "",
2482                         (tmp & UDC_RX_CNT_IE(2)) ? " rx1_cnt" : "",
2483                         (tmp & UDC_RX_EOT_IE(2)) ? " rx1_eot" : "",
2484
2485                         (tmp & UDC_TX_DONE_IE(1)) ? " tx0_done" : "",
2486                         (tmp & UDC_RX_CNT_IE(1)) ? " rx0_cnt" : "",
2487                         (tmp & UDC_RX_EOT_IE(1)) ? " rx0_eot" : "");
2488
2489                 tmp = omap_readw(UDC_RXDMA_CFG);
2490                 seq_printf(s, "rxdma_cfg   %04x\n", tmp);
2491                 if (tmp) {
2492                         for (i = 0; i < 3; i++) {
2493                                 if ((tmp & (0x0f << (i * 4))) == 0)
2494                                         continue;
2495                                 seq_printf(s, "rxdma[%d]    %04x\n", i,
2496                                                 omap_readw(UDC_RXDMA(i + 1)));
2497                         }
2498                 }
2499                 tmp = omap_readw(UDC_TXDMA_CFG);
2500                 seq_printf(s, "txdma_cfg   %04x\n", tmp);
2501                 if (tmp) {
2502                         for (i = 0; i < 3; i++) {
2503                                 if (!(tmp & (0x0f << (i * 4))))
2504                                         continue;
2505                                 seq_printf(s, "txdma[%d]    %04x\n", i,
2506                                                 omap_readw(UDC_TXDMA(i + 1)));
2507                         }
2508                 }
2509         }
2510
2511         tmp = omap_readw(UDC_DEVSTAT);
2512         if (tmp & UDC_ATT) {
2513                 proc_ep_show(s, &udc->ep[0]);
2514                 if (tmp & UDC_ADD) {
2515                         list_for_each_entry (ep, &udc->gadget.ep_list,
2516                                         ep.ep_list) {
2517                                 if (ep->desc)
2518                                         proc_ep_show(s, ep);
2519                         }
2520                 }
2521         }
2522         spin_unlock_irqrestore(&udc->lock, flags);
2523         return 0;
2524 }
2525
2526 static int proc_udc_open(struct inode *inode, struct file *file)
2527 {
2528         return single_open(file, proc_udc_show, NULL);
2529 }
2530
2531 static const struct file_operations proc_ops = {
2532         .owner          = THIS_MODULE,
2533         .open           = proc_udc_open,
2534         .read           = seq_read,
2535         .llseek         = seq_lseek,
2536         .release        = single_release,
2537 };
2538
2539 static void create_proc_file(void)
2540 {
2541         proc_create(proc_filename, 0, NULL, &proc_ops);
2542 }
2543
2544 static void remove_proc_file(void)
2545 {
2546         remove_proc_entry(proc_filename, NULL);
2547 }
2548
2549 #else
2550
2551 static inline void create_proc_file(void) {}
2552 static inline void remove_proc_file(void) {}
2553
2554 #endif
2555
2556 /*-------------------------------------------------------------------------*/
2557
2558 /* Before this controller can enumerate, we need to pick an endpoint
2559  * configuration, or "fifo_mode"  That involves allocating 2KB of packet
2560  * buffer space among the endpoints we'll be operating.
2561  *
2562  * NOTE: as of OMAP 1710 ES2.0, writing a new endpoint config when
2563  * UDC_SYSCON_1.CFG_LOCK is set can now work.  We won't use that
2564  * capability yet though.
2565  */
2566 static unsigned __init
2567 omap_ep_setup(char *name, u8 addr, u8 type,
2568                 unsigned buf, unsigned maxp, int dbuf)
2569 {
2570         struct omap_ep  *ep;
2571         u16             epn_rxtx = 0;
2572
2573         /* OUT endpoints first, then IN */
2574         ep = &udc->ep[addr & 0xf];
2575         if (addr & USB_DIR_IN)
2576                 ep += 16;
2577
2578         /* in case of ep init table bugs */
2579         BUG_ON(ep->name[0]);
2580
2581         /* chip setup ... bit values are same for IN, OUT */
2582         if (type == USB_ENDPOINT_XFER_ISOC) {
2583                 switch (maxp) {
2584                 case 8:         epn_rxtx = 0 << 12; break;
2585                 case 16:        epn_rxtx = 1 << 12; break;
2586                 case 32:        epn_rxtx = 2 << 12; break;
2587                 case 64:        epn_rxtx = 3 << 12; break;
2588                 case 128:       epn_rxtx = 4 << 12; break;
2589                 case 256:       epn_rxtx = 5 << 12; break;
2590                 case 512:       epn_rxtx = 6 << 12; break;
2591                 default:        BUG();
2592                 }
2593                 epn_rxtx |= UDC_EPN_RX_ISO;
2594                 dbuf = 1;
2595         } else {
2596                 /* double-buffering "not supported" on 15xx,
2597                  * and ignored for PIO-IN on newer chips
2598                  * (for more reliable behavior)
2599                  */
2600                 if (!use_dma || cpu_is_omap15xx() || cpu_is_omap24xx())
2601                         dbuf = 0;
2602
2603                 switch (maxp) {
2604                 case 8:         epn_rxtx = 0 << 12; break;
2605                 case 16:        epn_rxtx = 1 << 12; break;
2606                 case 32:        epn_rxtx = 2 << 12; break;
2607                 case 64:        epn_rxtx = 3 << 12; break;
2608                 default:        BUG();
2609                 }
2610                 if (dbuf && addr)
2611                         epn_rxtx |= UDC_EPN_RX_DB;
2612                 init_timer(&ep->timer);
2613                 ep->timer.function = pio_out_timer;
2614                 ep->timer.data = (unsigned long) ep;
2615         }
2616         if (addr)
2617                 epn_rxtx |= UDC_EPN_RX_VALID;
2618         BUG_ON(buf & 0x07);
2619         epn_rxtx |= buf >> 3;
2620
2621         DBG("%s addr %02x rxtx %04x maxp %d%s buf %d\n",
2622                 name, addr, epn_rxtx, maxp, dbuf ? "x2" : "", buf);
2623
2624         if (addr & USB_DIR_IN)
2625                 omap_writew(epn_rxtx, UDC_EP_TX(addr & 0xf));
2626         else
2627                 omap_writew(epn_rxtx, UDC_EP_RX(addr));
2628
2629         /* next endpoint's buffer starts after this one's */
2630         buf += maxp;
2631         if (dbuf)
2632                 buf += maxp;
2633         BUG_ON(buf > 2048);
2634
2635         /* set up driver data structures */
2636         BUG_ON(strlen(name) >= sizeof ep->name);
2637         strlcpy(ep->name, name, sizeof ep->name);
2638         INIT_LIST_HEAD(&ep->queue);
2639         INIT_LIST_HEAD(&ep->iso);
2640         ep->bEndpointAddress = addr;
2641         ep->bmAttributes = type;
2642         ep->double_buf = dbuf;
2643         ep->udc = udc;
2644
2645         ep->ep.name = ep->name;
2646         ep->ep.ops = &omap_ep_ops;
2647         ep->ep.maxpacket = ep->maxpacket = maxp;
2648         list_add_tail (&ep->ep.ep_list, &udc->gadget.ep_list);
2649
2650         return buf;
2651 }
2652
2653 static void omap_udc_release(struct device *dev)
2654 {
2655         complete(udc->done);
2656         kfree (udc);
2657         udc = NULL;
2658 }
2659
2660 static int __init
2661 omap_udc_setup(struct platform_device *odev, struct otg_transceiver *xceiv)
2662 {
2663         unsigned        tmp, buf;
2664
2665         /* abolish any previous hardware state */
2666         omap_writew(0, UDC_SYSCON1);
2667         omap_writew(0, UDC_IRQ_EN);
2668         omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
2669         omap_writew(0, UDC_DMA_IRQ_EN);
2670         omap_writew(0, UDC_RXDMA_CFG);
2671         omap_writew(0, UDC_TXDMA_CFG);
2672
2673         /* UDC_PULLUP_EN gates the chip clock */
2674         // OTG_SYSCON_1 |= DEV_IDLE_EN;
2675
2676         udc = kzalloc(sizeof(*udc), GFP_KERNEL);
2677         if (!udc)
2678                 return -ENOMEM;
2679
2680         spin_lock_init (&udc->lock);
2681
2682         udc->gadget.ops = &omap_gadget_ops;
2683         udc->gadget.ep0 = &udc->ep[0].ep;
2684         INIT_LIST_HEAD(&udc->gadget.ep_list);
2685         INIT_LIST_HEAD(&udc->iso);
2686         udc->gadget.speed = USB_SPEED_UNKNOWN;
2687         udc->gadget.name = driver_name;
2688
2689         device_initialize(&udc->gadget.dev);
2690         dev_set_name(&udc->gadget.dev, "gadget");
2691         udc->gadget.dev.release = omap_udc_release;
2692         udc->gadget.dev.parent = &odev->dev;
2693         if (use_dma)
2694                 udc->gadget.dev.dma_mask = odev->dev.dma_mask;
2695
2696         udc->transceiver = xceiv;
2697
2698         /* ep0 is special; put it right after the SETUP buffer */
2699         buf = omap_ep_setup("ep0", 0, USB_ENDPOINT_XFER_CONTROL,
2700                         8 /* after SETUP */, 64 /* maxpacket */, 0);
2701         list_del_init(&udc->ep[0].ep.ep_list);
2702
2703         /* initially disable all non-ep0 endpoints */
2704         for (tmp = 1; tmp < 15; tmp++) {
2705                 omap_writew(0, UDC_EP_RX(tmp));
2706                 omap_writew(0, UDC_EP_TX(tmp));
2707         }
2708
2709 #define OMAP_BULK_EP(name,addr) \
2710         buf = omap_ep_setup(name "-bulk", addr, \
2711                         USB_ENDPOINT_XFER_BULK, buf, 64, 1);
2712 #define OMAP_INT_EP(name,addr, maxp) \
2713         buf = omap_ep_setup(name "-int", addr, \
2714                         USB_ENDPOINT_XFER_INT, buf, maxp, 0);
2715 #define OMAP_ISO_EP(name,addr, maxp) \
2716         buf = omap_ep_setup(name "-iso", addr, \
2717                         USB_ENDPOINT_XFER_ISOC, buf, maxp, 1);
2718
2719         switch (fifo_mode) {
2720         case 0:
2721                 OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
2722                 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2723                 OMAP_INT_EP("ep3in",   USB_DIR_IN  | 3, 16);
2724                 break;
2725         case 1:
2726                 OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
2727                 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2728                 OMAP_INT_EP("ep9in",   USB_DIR_IN  | 9, 16);
2729
2730                 OMAP_BULK_EP("ep3in",  USB_DIR_IN  | 3);
2731                 OMAP_BULK_EP("ep4out", USB_DIR_OUT | 4);
2732                 OMAP_INT_EP("ep10in",  USB_DIR_IN  | 10, 16);
2733
2734                 OMAP_BULK_EP("ep5in",  USB_DIR_IN  | 5);
2735                 OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
2736                 OMAP_INT_EP("ep11in",  USB_DIR_IN  | 11, 16);
2737
2738                 OMAP_BULK_EP("ep6in",  USB_DIR_IN  | 6);
2739                 OMAP_BULK_EP("ep6out", USB_DIR_OUT | 6);
2740                 OMAP_INT_EP("ep12in",  USB_DIR_IN  | 12, 16);
2741
2742                 OMAP_BULK_EP("ep7in",  USB_DIR_IN  | 7);
2743                 OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
2744                 OMAP_INT_EP("ep13in",  USB_DIR_IN  | 13, 16);
2745                 OMAP_INT_EP("ep13out", USB_DIR_OUT | 13, 16);
2746
2747                 OMAP_BULK_EP("ep8in",  USB_DIR_IN  | 8);
2748                 OMAP_BULK_EP("ep8out", USB_DIR_OUT | 8);
2749                 OMAP_INT_EP("ep14in",  USB_DIR_IN  | 14, 16);
2750                 OMAP_INT_EP("ep14out", USB_DIR_OUT | 14, 16);
2751
2752                 OMAP_BULK_EP("ep15in",  USB_DIR_IN  | 15);
2753                 OMAP_BULK_EP("ep15out", USB_DIR_OUT | 15);
2754
2755                 break;
2756
2757 #ifdef  USE_ISO
2758         case 2:                 /* mixed iso/bulk */
2759                 OMAP_ISO_EP("ep1in",   USB_DIR_IN  | 1, 256);
2760                 OMAP_ISO_EP("ep2out",  USB_DIR_OUT | 2, 256);
2761                 OMAP_ISO_EP("ep3in",   USB_DIR_IN  | 3, 128);
2762                 OMAP_ISO_EP("ep4out",  USB_DIR_OUT | 4, 128);
2763
2764                 OMAP_INT_EP("ep5in",   USB_DIR_IN  | 5, 16);
2765
2766                 OMAP_BULK_EP("ep6in",  USB_DIR_IN  | 6);
2767                 OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7);
2768                 OMAP_INT_EP("ep8in",   USB_DIR_IN  | 8, 16);
2769                 break;
2770         case 3:                 /* mixed bulk/iso */
2771                 OMAP_BULK_EP("ep1in",  USB_DIR_IN  | 1);
2772                 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2);
2773                 OMAP_INT_EP("ep3in",   USB_DIR_IN  | 3, 16);
2774
2775                 OMAP_BULK_EP("ep4in",  USB_DIR_IN  | 4);
2776                 OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5);
2777                 OMAP_INT_EP("ep6in",   USB_DIR_IN  | 6, 16);
2778
2779                 OMAP_ISO_EP("ep7in",   USB_DIR_IN  | 7, 256);
2780                 OMAP_ISO_EP("ep8out",  USB_DIR_OUT | 8, 256);
2781                 OMAP_INT_EP("ep9in",   USB_DIR_IN  | 9, 16);
2782                 break;
2783 #endif
2784
2785         /* add more modes as needed */
2786
2787         default:
2788                 ERR("unsupported fifo_mode #%d\n", fifo_mode);
2789                 return -ENODEV;
2790         }
2791         omap_writew(UDC_CFG_LOCK|UDC_SELF_PWR, UDC_SYSCON1);
2792         INFO("fifo mode %d, %d bytes not used\n", fifo_mode, 2048 - buf);
2793         return 0;
2794 }
2795
2796 static int __init omap_udc_probe(struct platform_device *pdev)
2797 {
2798         int                     status = -ENODEV;
2799         int                     hmc;
2800         struct otg_transceiver  *xceiv = NULL;
2801         const char              *type = NULL;
2802         struct omap_usb_config  *config = pdev->dev.platform_data;
2803         struct clk              *dc_clk;
2804         struct clk              *hhc_clk;
2805
2806         /* NOTE:  "knows" the order of the resources! */
2807         if (!request_mem_region(pdev->resource[0].start,
2808                         pdev->resource[0].end - pdev->resource[0].start + 1,
2809                         driver_name)) {
2810                 DBG("request_mem_region failed\n");
2811                 return -EBUSY;
2812         }
2813
2814         if (cpu_is_omap16xx()) {
2815                 dc_clk = clk_get(&pdev->dev, "usb_dc_ck");
2816                 hhc_clk = clk_get(&pdev->dev, "usb_hhc_ck");
2817                 BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
2818                 /* can't use omap_udc_enable_clock yet */
2819                 clk_enable(dc_clk);
2820                 clk_enable(hhc_clk);
2821                 udelay(100);
2822         }
2823
2824         if (cpu_is_omap24xx()) {
2825                 dc_clk = clk_get(&pdev->dev, "usb_fck");
2826                 hhc_clk = clk_get(&pdev->dev, "usb_l4_ick");
2827                 BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
2828                 /* can't use omap_udc_enable_clock yet */
2829                 clk_enable(dc_clk);
2830                 clk_enable(hhc_clk);
2831                 udelay(100);
2832         }
2833
2834         INFO("OMAP UDC rev %d.%d%s\n",
2835                 omap_readw(UDC_REV) >> 4, omap_readw(UDC_REV) & 0xf,
2836                 config->otg ? ", Mini-AB" : "");
2837
2838         /* use the mode given to us by board init code */
2839         if (cpu_is_omap15xx()) {
2840                 hmc = HMC_1510;
2841                 type = "(unknown)";
2842
2843                 if (machine_without_vbus_sense()) {
2844                         /* just set up software VBUS detect, and then
2845                          * later rig it so we always report VBUS.
2846                          * FIXME without really sensing VBUS, we can't
2847                          * know when to turn PULLUP_EN on/off; and that
2848                          * means we always "need" the 48MHz clock.
2849                          */
2850                         u32 tmp = omap_readl(FUNC_MUX_CTRL_0);
2851                         tmp &= ~VBUS_CTRL_1510;
2852                         omap_writel(tmp, FUNC_MUX_CTRL_0);
2853                         tmp |= VBUS_MODE_1510;
2854                         tmp &= ~VBUS_CTRL_1510;
2855                         omap_writel(tmp, FUNC_MUX_CTRL_0);
2856                 }
2857         } else {
2858                 /* The transceiver may package some GPIO logic or handle
2859                  * loopback and/or transceiverless setup; if we find one,
2860                  * use it.  Except for OTG, we don't _need_ to talk to one;
2861                  * but not having one probably means no VBUS detection.
2862                  */
2863                 xceiv = otg_get_transceiver();
2864                 if (xceiv)
2865                         type = xceiv->label;
2866                 else if (config->otg) {
2867                         DBG("OTG requires external transceiver!\n");
2868                         goto cleanup0;
2869                 }
2870
2871                 hmc = HMC_1610;
2872
2873                 if (cpu_is_omap24xx()) {
2874                         /* this could be transceiverless in one of the
2875                          * "we don't need to know" modes.
2876                          */
2877                         type = "external";
2878                         goto known;
2879                 }
2880
2881                 switch (hmc) {
2882                 case 0:                 /* POWERUP DEFAULT == 0 */
2883                 case 4:
2884                 case 12:
2885                 case 20:
2886                         if (!cpu_is_omap1710()) {
2887                                 type = "integrated";
2888                                 break;
2889                         }
2890                         /* FALL THROUGH */
2891                 case 3:
2892                 case 11:
2893                 case 16:
2894                 case 19:
2895                 case 25:
2896                         if (!xceiv) {
2897                                 DBG("external transceiver not registered!\n");
2898                                 type = "unknown";
2899                         }
2900                         break;
2901                 case 21:                        /* internal loopback */
2902                         type = "loopback";
2903                         break;
2904                 case 14:                        /* transceiverless */
2905                         if (cpu_is_omap1710())
2906                                 goto bad_on_1710;
2907                         /* FALL THROUGH */
2908                 case 13:
2909                 case 15:
2910                         type = "no";
2911                         break;
2912
2913                 default:
2914 bad_on_1710:
2915                         ERR("unrecognized UDC HMC mode %d\n", hmc);
2916                         goto cleanup0;
2917                 }
2918         }
2919 known:
2920         INFO("hmc mode %d, %s transceiver\n", hmc, type);
2921
2922         /* a "gadget" abstracts/virtualizes the controller */
2923         status = omap_udc_setup(pdev, xceiv);
2924         if (status) {
2925                 goto cleanup0;
2926         }
2927         xceiv = NULL;
2928         // "udc" is now valid
2929         pullup_disable(udc);
2930 #if     defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
2931         udc->gadget.is_otg = (config->otg != 0);
2932 #endif
2933
2934         /* starting with omap1710 es2.0, clear toggle is a separate bit */
2935         if (omap_readw(UDC_REV) >= 0x61)
2936                 udc->clr_halt = UDC_RESET_EP | UDC_CLRDATA_TOGGLE;
2937         else
2938                 udc->clr_halt = UDC_RESET_EP;
2939
2940         /* USB general purpose IRQ:  ep0, state changes, dma, etc */
2941         status = request_irq(pdev->resource[1].start, omap_udc_irq,
2942                         IRQF_SAMPLE_RANDOM, driver_name, udc);
2943         if (status != 0) {
2944                 ERR("can't get irq %d, err %d\n",
2945                         (int) pdev->resource[1].start, status);
2946                 goto cleanup1;
2947         }
2948
2949         /* USB "non-iso" IRQ (PIO for all but ep0) */
2950         status = request_irq(pdev->resource[2].start, omap_udc_pio_irq,
2951                         IRQF_SAMPLE_RANDOM, "omap_udc pio", udc);
2952         if (status != 0) {
2953                 ERR("can't get irq %d, err %d\n",
2954                         (int) pdev->resource[2].start, status);
2955                 goto cleanup2;
2956         }
2957 #ifdef  USE_ISO
2958         status = request_irq(pdev->resource[3].start, omap_udc_iso_irq,
2959                         IRQF_DISABLED, "omap_udc iso", udc);
2960         if (status != 0) {
2961                 ERR("can't get irq %d, err %d\n",
2962                         (int) pdev->resource[3].start, status);
2963                 goto cleanup3;
2964         }
2965 #endif
2966         if (cpu_is_omap16xx()) {
2967                 udc->dc_clk = dc_clk;
2968                 udc->hhc_clk = hhc_clk;
2969                 clk_disable(hhc_clk);
2970                 clk_disable(dc_clk);
2971         }
2972
2973         if (cpu_is_omap24xx()) {
2974                 udc->dc_clk = dc_clk;
2975                 udc->hhc_clk = hhc_clk;
2976                 /* FIXME OMAP2 don't release hhc & dc clock */
2977 #if 0
2978                 clk_disable(hhc_clk);
2979                 clk_disable(dc_clk);
2980 #endif
2981         }
2982
2983         create_proc_file();
2984         status = device_add(&udc->gadget.dev);
2985         if (!status)
2986                 return status;
2987         /* If fail, fall through */
2988 #ifdef  USE_ISO
2989 cleanup3:
2990         free_irq(pdev->resource[2].start, udc);
2991 #endif
2992
2993 cleanup2:
2994         free_irq(pdev->resource[1].start, udc);
2995
2996 cleanup1:
2997         kfree (udc);
2998         udc = NULL;
2999
3000 cleanup0:
3001         if (xceiv)
3002                 put_device(xceiv->dev);
3003
3004         if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
3005                 clk_disable(hhc_clk);
3006                 clk_disable(dc_clk);
3007                 clk_put(hhc_clk);
3008                 clk_put(dc_clk);
3009         }
3010
3011         release_mem_region(pdev->resource[0].start,
3012                         pdev->resource[0].end - pdev->resource[0].start + 1);
3013
3014         return status;
3015 }
3016
3017 static int __exit omap_udc_remove(struct platform_device *pdev)
3018 {
3019         DECLARE_COMPLETION_ONSTACK(done);
3020
3021         if (!udc)
3022                 return -ENODEV;
3023         if (udc->driver)
3024                 return -EBUSY;
3025
3026         udc->done = &done;
3027
3028         pullup_disable(udc);
3029         if (udc->transceiver) {
3030                 put_device(udc->transceiver->dev);
3031                 udc->transceiver = NULL;
3032         }
3033         omap_writew(0, UDC_SYSCON1);
3034
3035         remove_proc_file();
3036
3037 #ifdef  USE_ISO
3038         free_irq(pdev->resource[3].start, udc);
3039 #endif
3040         free_irq(pdev->resource[2].start, udc);
3041         free_irq(pdev->resource[1].start, udc);
3042
3043         if (udc->dc_clk) {
3044                 if (udc->clk_requested)
3045                         omap_udc_enable_clock(0);
3046                 clk_put(udc->hhc_clk);
3047                 clk_put(udc->dc_clk);
3048         }
3049
3050         release_mem_region(pdev->resource[0].start,
3051                         pdev->resource[0].end - pdev->resource[0].start + 1);
3052
3053         device_unregister(&udc->gadget.dev);
3054         wait_for_completion(&done);
3055
3056         return 0;
3057 }
3058
3059 /* suspend/resume/wakeup from sysfs (echo > power/state) or when the
3060  * system is forced into deep sleep
3061  *
3062  * REVISIT we should probably reject suspend requests when there's a host
3063  * session active, rather than disconnecting, at least on boards that can
3064  * report VBUS irqs (UDC_DEVSTAT.UDC_ATT).  And in any case, we need to
3065  * make host resumes and VBUS detection trigger OMAP wakeup events; that
3066  * may involve talking to an external transceiver (e.g. isp1301).
3067  */
3068
3069 static int omap_udc_suspend(struct platform_device *dev, pm_message_t message)
3070 {
3071         u32     devstat;
3072
3073         devstat = omap_readw(UDC_DEVSTAT);
3074
3075         /* we're requesting 48 MHz clock if the pullup is enabled
3076          * (== we're attached to the host) and we're not suspended,
3077          * which would prevent entry to deep sleep...
3078          */
3079         if ((devstat & UDC_ATT) != 0 && (devstat & UDC_SUS) == 0) {
3080                 WARNING("session active; suspend requires disconnect\n");
3081                 omap_pullup(&udc->gadget, 0);
3082         }
3083
3084         return 0;
3085 }
3086
3087 static int omap_udc_resume(struct platform_device *dev)
3088 {
3089         DBG("resume + wakeup/SRP\n");
3090         omap_pullup(&udc->gadget, 1);
3091
3092         /* maybe the host would enumerate us if we nudged it */
3093         msleep(100);
3094         return omap_wakeup(&udc->gadget);
3095 }
3096
3097 /*-------------------------------------------------------------------------*/
3098
3099 static struct platform_driver udc_driver = {
3100         .probe          = omap_udc_probe,
3101         .remove         = __exit_p(omap_udc_remove),
3102         .suspend        = omap_udc_suspend,
3103         .resume         = omap_udc_resume,
3104         .driver         = {
3105                 .owner  = THIS_MODULE,
3106                 .name   = (char *) driver_name,
3107         },
3108 };
3109
3110 static int __init udc_init(void)
3111 {
3112         INFO("%s, version: " DRIVER_VERSION
3113 #ifdef  USE_ISO
3114                 " (iso)"
3115 #endif
3116                 "%s\n", driver_desc,
3117                 use_dma ?  " (dma)" : "");
3118         return platform_driver_register(&udc_driver);
3119 }
3120 module_init(udc_init);
3121
3122 static void __exit udc_exit(void)
3123 {
3124         platform_driver_unregister(&udc_driver);
3125 }
3126 module_exit(udc_exit);
3127
3128 MODULE_DESCRIPTION(DRIVER_DESC);
3129 MODULE_LICENSE("GPL");
3130 MODULE_ALIAS("platform:omap_udc");