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

   1 /*
   2  * Toshiba TC86C001 ("Goku-S") USB Device Controller driver
   3  *
   4  * Copyright (C) 2000-2002 Lineo
   5  *      by Stuart Lynne, Tom Rushworth, and Bruce Balden
   6  * Copyright (C) 2002 Toshiba Corporation
   7  * Copyright (C) 2003 MontaVista Software (source@mvista.com)
   8  *
   9  * This file is licensed under the terms of the GNU General Public
  10  * License version 2.  This program is licensed "as is" without any
  11  * warranty of any kind, whether express or implied.
  12  */
  13
  14 /*
  15  * This device has ep0 and three semi-configurable bulk/interrupt endpoints.
  16  *
  17  *  - Endpoint numbering is fixed: ep{1,2,3}-bulk
  18  *  - Gadget drivers can choose ep maxpacket (8/16/32/64)
  19  *  - Gadget drivers can choose direction (IN, OUT)
  20  *  - DMA works with ep1 (OUT transfers) and ep2 (IN transfers).
  21  */
  22
  23 #undef DEBUG
  24 // #define      VERBOSE         /* extra debug messages (success too) */
  25 // #define      USB_TRACE       /* packet-level success messages */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/pci.h>
  30 #include <linux/delay.h>
  31 #include <linux/ioport.h>
  32 #include <linux/sched.h>
  33 #include <linux/slab.h>
  34 #include <linux/smp_lock.h>
  35 #include <linux/errno.h>
  36 #include <linux/init.h>
  37 #include <linux/timer.h>
  38 #include <linux/list.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/device.h>
  42 #include <linux/usb_ch9.h>
  43 #include <linux/usb_gadget.h>
  44
  45 #include <asm/byteorder.h>
  46 #include <asm/io.h>
  47 #include <asm/irq.h>
  48 #include <asm/system.h>
  49 #include <asm/unaligned.h>
  50
  51
  52 #include "goku_udc.h"
  53
  54 #define DRIVER_DESC             "TC86C001 USB Device Controller"
  55 #define DRIVER_VERSION          "30-Oct 2003"
  56
  57 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
  58
  59 static const char driver_name [] = "goku_udc";
  60 static const char driver_desc [] = DRIVER_DESC;
  61
  62 MODULE_AUTHOR("source@mvista.com");
  63 MODULE_DESCRIPTION(DRIVER_DESC);
  64 MODULE_LICENSE("GPL");
  65
  66
  67 /*
  68  * IN dma behaves ok under testing, though the IN-dma abort paths don't
  69  * seem to behave quite as expected.  Used by default.
  70  *
  71  * OUT dma documents design problems handling the common "short packet"
  72  * transfer termination policy; it couldn't be enabled by default, even
  73  * if the OUT-dma abort problems had a resolution.
  74  */
  75 static unsigned use_dma = 1;
  76
  77 #if 0
  78 //#include <linux/moduleparam.h>
  79 /* "modprobe goku_udc use_dma=1" etc
  80  *      0 to disable dma
  81  *      1 to use IN dma only (normal operation)
  82  *      2 to use IN and OUT dma
  83  */
  84 module_param(use_dma, uint, S_IRUGO);
  85 #endif
  86
  87 /*-------------------------------------------------------------------------*/
  88
  89 static void nuke(struct goku_ep *, int status);
  90
  91 static inline void
  92 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
  93 {
  94         writel(COMMAND_EP(epnum) | command, &regs->Command);
  95         udelay(300);
  96 }
  97
  98 static int
  99 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 100 {
 101         struct goku_udc *dev;
 102         struct goku_ep  *ep;
 103         u32             mode;
 104         u16             max;
 105         unsigned long   flags;
 106
 107         ep = container_of(_ep, struct goku_ep, ep);
 108         if (!_ep || !desc || ep->desc
 109                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 110                 return -EINVAL;
 111         dev = ep->dev;
 112         if (ep == &dev->ep[0])
 113                 return -EINVAL;
 114         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 115                 return -ESHUTDOWN;
 116         if (ep->num != (desc->bEndpointAddress & 0x0f))
 117                 return -EINVAL;
 118
 119         switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 120         case USB_ENDPOINT_XFER_BULK:
 121         case USB_ENDPOINT_XFER_INT:
 122                 break;
 123         default:
 124                 return -EINVAL;
 125         }
 126
 127         if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
 128                         != EPxSTATUS_EP_INVALID)
 129                 return -EBUSY;
 130
 131         /* enabling the no-toggle interrupt mode would need an api hook */
 132         mode = 0;
 133         max = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 134         switch (max) {
 135         case 64:        mode++;
 136         case 32:        mode++;
 137         case 16:        mode++;
 138         case 8:         mode <<= 3;
 139                         break;
 140         default:
 141                 return -EINVAL;
 142         }
 143         mode |= 2 << 1;         /* bulk, or intr-with-toggle */
 144
 145         /* ep1/ep2 dma direction is chosen early; it works in the other
 146          * direction, with pio.  be cautious with out-dma.
 147          */
 148         ep->is_in = (USB_DIR_IN & desc->bEndpointAddress) != 0;
 149         if (ep->is_in) {
 150                 mode |= 1;
 151                 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
 152         } else {
 153                 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
 154                 if (ep->dma)
 155                         DBG(dev, "%s out-dma hides short packets\n",
 156                                 ep->ep.name);
 157         }
 158
 159         spin_lock_irqsave(&ep->dev->lock, flags);
 160
 161         /* ep1 and ep2 can do double buffering and/or dma */
 162         if (ep->num < 3) {
 163                 struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 164                 u32                             tmp;
 165
 166                 /* double buffer except (for now) with pio in */
 167                 tmp = ((ep->dma || !ep->is_in)
 168                                 ? 0x10  /* double buffered */
 169                                 : 0x11  /* single buffer */
 170                         ) << ep->num;
 171                 tmp |= readl(&regs->EPxSingle);
 172                 writel(tmp, &regs->EPxSingle);
 173
 174                 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
 175                 tmp |= readl(&regs->EPxBCS);
 176                 writel(tmp, &regs->EPxBCS);
 177         }
 178         writel(mode, ep->reg_mode);
 179         command(ep->dev->regs, COMMAND_RESET, ep->num);
 180         ep->ep.maxpacket = max;
 181         ep->stopped = 0;
 182         ep->desc = desc;
 183         spin_unlock_irqrestore(&ep->dev->lock, flags);
 184
 185         DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
 186                 ep->is_in ? "IN" : "OUT",
 187                 ep->dma ? "dma" : "pio",
 188                 max);
 189
 190         return 0;
 191 }
 192
 193 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
 194 {
 195         struct goku_udc         *dev = ep->dev;
 196
 197         if (regs) {
 198                 command(regs, COMMAND_INVALID, ep->num);
 199                 if (ep->num) {
 200                         if (ep->num == UDC_MSTWR_ENDPOINT)
 201                                 dev->int_enable &= ~(INT_MSTWREND
 202                                                         |INT_MSTWRTMOUT);
 203                         else if (ep->num == UDC_MSTRD_ENDPOINT)
 204                                 dev->int_enable &= ~INT_MSTRDEND;
 205                         dev->int_enable &= ~INT_EPxDATASET (ep->num);
 206                 } else
 207                         dev->int_enable &= ~INT_EP0;
 208                 writel(dev->int_enable, &regs->int_enable);
 209                 readl(&regs->int_enable);
 210                 if (ep->num < 3) {
 211                         struct goku_udc_regs __iomem    *r = ep->dev->regs;
 212                         u32                             tmp;
 213
 214                         tmp = readl(&r->EPxSingle);
 215                         tmp &= ~(0x11 << ep->num);
 216                         writel(tmp, &r->EPxSingle);
 217
 218                         tmp = readl(&r->EPxBCS);
 219                         tmp &= ~(0x11 << ep->num);
 220                         writel(tmp, &r->EPxBCS);
 221                 }
 222                 /* reset dma in case we're still using it */
 223                 if (ep->dma) {
 224                         u32     master;
 225
 226                         master = readl(&regs->dma_master) & MST_RW_BITS;
 227                         if (ep->num == UDC_MSTWR_ENDPOINT) {
 228                                 master &= ~MST_W_BITS;
 229                                 master |= MST_WR_RESET;
 230                         } else {
 231                                 master &= ~MST_R_BITS;
 232                                 master |= MST_RD_RESET;
 233                         }
 234                         writel(master, &regs->dma_master);
 235                 }
 236         }
 237
 238         ep->ep.maxpacket = MAX_FIFO_SIZE;
 239         ep->desc = NULL;
 240         ep->stopped = 1;
 241         ep->irqs = 0;
 242         ep->dma = 0;
 243 }
 244
 245 static int goku_ep_disable(struct usb_ep *_ep)
 246 {
 247         struct goku_ep  *ep;
 248         struct goku_udc *dev;
 249         unsigned long   flags;
 250
 251         ep = container_of(_ep, struct goku_ep, ep);
 252         if (!_ep || !ep->desc)
 253                 return -ENODEV;
 254         dev = ep->dev;
 255         if (dev->ep0state == EP0_SUSPEND)
 256                 return -EBUSY;
 257
 258         VDBG(dev, "disable %s\n", _ep->name);
 259
 260         spin_lock_irqsave(&dev->lock, flags);
 261         nuke(ep, -ESHUTDOWN);
 262         ep_reset(dev->regs, ep);
 263         spin_unlock_irqrestore(&dev->lock, flags);
 264
 265         return 0;
 266 }
 267
 268 /*-------------------------------------------------------------------------*/
 269
 270 static struct usb_request *
 271 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 272 {
 273         struct goku_request     *req;
 274
 275         if (!_ep)
 276                 return NULL;
 277         req = kzalloc(sizeof *req, gfp_flags);
 278         if (!req)
 279                 return NULL;
 280
 281         req->req.dma = DMA_ADDR_INVALID;
 282         INIT_LIST_HEAD(&req->queue);
 283         return &req->req;
 284 }
 285
 286 static void
 287 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
 288 {
 289         struct goku_request     *req;
 290
 291         if (!_ep || !_req)
 292                 return;
 293
 294         req = container_of(_req, struct goku_request, req);
 295         WARN_ON(!list_empty(&req->queue));
 296         kfree(req);
 297 }
 298
 299 /*-------------------------------------------------------------------------*/
 300
 301 #undef USE_KMALLOC
 302
 303 /* many common platforms have dma-coherent caches, which means that it's
 304  * safe to use kmalloc() memory for all i/o buffers without using any
 305  * cache flushing calls.  (unless you're trying to share cache lines
 306  * between dma and non-dma activities, which is a slow idea in any case.)
 307  *
 308  * other platforms need more care, with 2.6 having a moderately general
 309  * solution except for the common "buffer is smaller than a page" case.
 310  */
 311 #if     defined(CONFIG_X86)
 312 #define USE_KMALLOC
 313
 314 #elif   defined(CONFIG_MIPS) && !defined(CONFIG_DMA_NONCOHERENT)
 315 #define USE_KMALLOC
 316
 317 #elif   defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
 318 #define USE_KMALLOC
 319
 320 #endif
 321
 322 /* allocating buffers this way eliminates dma mapping overhead, which
 323  * on some platforms will mean eliminating a per-io buffer copy.  with
 324  * some kinds of system caches, further tweaks may still be needed.
 325  */
 326 static void *
 327 goku_alloc_buffer(struct usb_ep *_ep, unsigned bytes,
 328                         dma_addr_t *dma, gfp_t gfp_flags)
 329 {
 330         void            *retval;
 331         struct goku_ep  *ep;
 332
 333         ep = container_of(_ep, struct goku_ep, ep);
 334         if (!_ep)
 335                 return NULL;
 336         *dma = DMA_ADDR_INVALID;
 337
 338 #if     defined(USE_KMALLOC)
 339         retval = kmalloc(bytes, gfp_flags);
 340         if (retval)
 341                 *dma = virt_to_phys(retval);
 342 #else
 343         if (ep->dma) {
 344                 /* the main problem with this call is that it wastes memory
 345                  * on typical 1/N page allocations: it allocates 1-N pages.
 346                  */
 347 #warning Using dma_alloc_coherent even with buffers smaller than a page.
 348                 retval = dma_alloc_coherent(&ep->dev->pdev->dev,
 349                                 bytes, dma, gfp_flags);
 350         } else
 351                 retval = kmalloc(bytes, gfp_flags);
 352 #endif
 353         return retval;
 354 }
 355
 356 static void
 357 goku_free_buffer(struct usb_ep *_ep, void *buf, dma_addr_t dma, unsigned bytes)
 358 {
 359         /* free memory into the right allocator */
 360 #ifndef USE_KMALLOC
 361         if (dma != DMA_ADDR_INVALID) {
 362                 struct goku_ep  *ep;
 363
 364                 ep = container_of(_ep, struct goku_ep, ep);
 365                 if (!_ep)
 366                         return;
 367                 dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma);
 368         } else
 369 #endif
 370                 kfree (buf);
 371 }
 372
 373 /*-------------------------------------------------------------------------*/
 374
 375 static void
 376 done(struct goku_ep *ep, struct goku_request *req, int status)
 377 {
 378         struct goku_udc         *dev;
 379         unsigned                stopped = ep->stopped;
 380
 381         list_del_init(&req->queue);
 382
 383         if (likely(req->req.status == -EINPROGRESS))
 384                 req->req.status = status;
 385         else
 386                 status = req->req.status;
 387
 388         dev = ep->dev;
 389         if (req->mapped) {
 390                 pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
 391                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 392                 req->req.dma = DMA_ADDR_INVALID;
 393                 req->mapped = 0;
 394         }
 395
 396 #ifndef USB_TRACE
 397         if (status && status != -ESHUTDOWN)
 398 #endif
 399                 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
 400                         ep->ep.name, &req->req, status,
 401                         req->req.actual, req->req.length);
 402
 403         /* don't modify queue heads during completion callback */
 404         ep->stopped = 1;
 405         spin_unlock(&dev->lock);
 406         req->req.complete(&ep->ep, &req->req);
 407         spin_lock(&dev->lock);
 408         ep->stopped = stopped;
 409 }
 410
 411 /*-------------------------------------------------------------------------*/
 412
 413 static inline int
 414 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
 415 {
 416         unsigned        length, count;
 417
 418         length = min(req->req.length - req->req.actual, max);
 419         req->req.actual += length;
 420
 421         count = length;
 422         while (likely(count--))
 423                 writel(*buf++, fifo);
 424         return length;
 425 }
 426
 427 // return:  0 = still running, 1 = completed, negative = errno
 428 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
 429 {
 430         struct goku_udc *dev = ep->dev;
 431         u32             tmp;
 432         u8              *buf;
 433         unsigned        count;
 434         int             is_last;
 435
 436         tmp = readl(&dev->regs->DataSet);
 437         buf = req->req.buf + req->req.actual;
 438         prefetch(buf);
 439
 440         dev = ep->dev;
 441         if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
 442                 return -EL2HLT;
 443
 444         /* NOTE:  just single-buffered PIO-IN for now.  */
 445         if (unlikely((tmp & DATASET_A(ep->num)) != 0))
 446                 return 0;
 447
 448         /* clear our "packet available" irq */
 449         if (ep->num != 0)
 450                 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
 451
 452         count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
 453
 454         /* last packet often short (sometimes a zlp, especially on ep0) */
 455         if (unlikely(count != ep->ep.maxpacket)) {
 456                 writel(~(1<<ep->num), &dev->regs->EOP);
 457                 if (ep->num == 0) {
 458                         dev->ep[0].stopped = 1;
 459                         dev->ep0state = EP0_STATUS;
 460                 }
 461                 is_last = 1;
 462         } else {
 463                 if (likely(req->req.length != req->req.actual)
 464                                 || req->req.zero)
 465                         is_last = 0;
 466                 else
 467                         is_last = 1;
 468         }
 469 #if 0           /* printk seemed to trash is_last...*/
 470 //#ifdef USB_TRACE
 471         VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
 472                 ep->ep.name, count, is_last ? "/last" : "",
 473                 req->req.length - req->req.actual, req);
 474 #endif
 475
 476         /* requests complete when all IN data is in the FIFO,
 477          * or sometimes later, if a zlp was needed.
 478          */
 479         if (is_last) {
 480                 done(ep, req, 0);
 481                 return 1;
 482         }
 483
 484         return 0;
 485 }
 486
 487 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
 488 {
 489         struct goku_udc_regs __iomem    *regs;
 490         u32                             size, set;
 491         u8                              *buf;
 492         unsigned                        bufferspace, is_short, dbuff;
 493
 494         regs = ep->dev->regs;
 495 top:
 496         buf = req->req.buf + req->req.actual;
 497         prefetchw(buf);
 498
 499         if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
 500                 return -EL2HLT;
 501
 502         dbuff = (ep->num == 1 || ep->num == 2);
 503         do {
 504                 /* ack dataset irq matching the status we'll handle */
 505                 if (ep->num != 0)
 506                         writel(~INT_EPxDATASET(ep->num), &regs->int_status);
 507
 508                 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
 509                 size = readl(&regs->EPxSizeLA[ep->num]);
 510                 bufferspace = req->req.length - req->req.actual;
 511
 512                 /* usually do nothing without an OUT packet */
 513                 if (likely(ep->num != 0 || bufferspace != 0)) {
 514                         if (unlikely(set == 0))
 515                                 break;
 516                         /* use ep1/ep2 double-buffering for OUT */
 517                         if (!(size & PACKET_ACTIVE))
 518                                 size = readl(&regs->EPxSizeLB[ep->num]);
 519                         if (!(size & PACKET_ACTIVE))    // "can't happen"
 520                                 break;
 521                         size &= DATASIZE;       /* EPxSizeH == 0 */
 522
 523                 /* ep0out no-out-data case for set_config, etc */
 524                 } else
 525                         size = 0;
 526
 527                 /* read all bytes from this packet */
 528                 req->req.actual += size;
 529                 is_short = (size < ep->ep.maxpacket);
 530 #ifdef USB_TRACE
 531                 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
 532                         ep->ep.name, size, is_short ? "/S" : "",
 533                         req, req->req.actual, req->req.length);
 534 #endif
 535                 while (likely(size-- != 0)) {
 536                         u8      byte = (u8) readl(ep->reg_fifo);
 537
 538                         if (unlikely(bufferspace == 0)) {
 539                                 /* this happens when the driver's buffer
 540                                  * is smaller than what the host sent.
 541                                  * discard the extra data in this packet.
 542                                  */
 543                                 if (req->req.status != -EOVERFLOW)
 544                                         DBG(ep->dev, "%s overflow %u\n",
 545                                                 ep->ep.name, size);
 546                                 req->req.status = -EOVERFLOW;
 547                         } else {
 548                                 *buf++ = byte;
 549                                 bufferspace--;
 550                         }
 551                 }
 552
 553                 /* completion */
 554                 if (unlikely(is_short || req->req.actual == req->req.length)) {
 555                         if (unlikely(ep->num == 0)) {
 556                                 /* non-control endpoints now usable? */
 557                                 if (ep->dev->req_config)
 558                                         writel(ep->dev->configured
 559                                                         ? USBSTATE_CONFIGURED
 560                                                         : 0,
 561                                                 &regs->UsbState);
 562                                 /* ep0out status stage */
 563                                 writel(~(1<<0), &regs->EOP);
 564                                 ep->stopped = 1;
 565                                 ep->dev->ep0state = EP0_STATUS;
 566                         }
 567                         done(ep, req, 0);
 568
 569                         /* empty the second buffer asap */
 570                         if (dbuff && !list_empty(&ep->queue)) {
 571                                 req = list_entry(ep->queue.next,
 572                                                 struct goku_request, queue);
 573                                 goto top;
 574                         }
 575                         return 1;
 576                 }
 577         } while (dbuff);
 578         return 0;
 579 }
 580
 581 static inline void
 582 pio_irq_enable(struct goku_udc *dev,
 583                 struct goku_udc_regs __iomem *regs, int epnum)
 584 {
 585         dev->int_enable |= INT_EPxDATASET (epnum);
 586         writel(dev->int_enable, &regs->int_enable);
 587         /* write may still be posted */
 588 }
 589
 590 static inline void
 591 pio_irq_disable(struct goku_udc *dev,
 592                 struct goku_udc_regs __iomem *regs, int epnum)
 593 {
 594         dev->int_enable &= ~INT_EPxDATASET (epnum);
 595         writel(dev->int_enable, &regs->int_enable);
 596         /* write may still be posted */
 597 }
 598
 599 static inline void
 600 pio_advance(struct goku_ep *ep)
 601 {
 602         struct goku_request     *req;
 603
 604         if (unlikely(list_empty (&ep->queue)))
 605                 return;
 606         req = list_entry(ep->queue.next, struct goku_request, queue);
 607         (ep->is_in ? write_fifo : read_fifo)(ep, req);
 608 }
 609
 610
 611 /*-------------------------------------------------------------------------*/
 612
 613 // return:  0 = q running, 1 = q stopped, negative = errno
 614 static int start_dma(struct goku_ep *ep, struct goku_request *req)
 615 {
 616         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 617         u32                             master;
 618         u32                             start = req->req.dma;
 619         u32                             end = start + req->req.length - 1;
 620
 621         master = readl(&regs->dma_master) & MST_RW_BITS;
 622
 623         /* re-init the bits affecting IN dma; careful with zlps */
 624         if (likely(ep->is_in)) {
 625                 if (unlikely(master & MST_RD_ENA)) {
 626                         DBG (ep->dev, "start, IN active dma %03x!!\n",
 627                                 master);
 628 //                      return -EL2HLT;
 629                 }
 630                 writel(end, &regs->in_dma_end);
 631                 writel(start, &regs->in_dma_start);
 632
 633                 master &= ~MST_R_BITS;
 634                 if (unlikely(req->req.length == 0))
 635                         master = MST_RD_ENA | MST_RD_EOPB;
 636                 else if ((req->req.length % ep->ep.maxpacket) != 0
 637                                         || req->req.zero)
 638                         master = MST_RD_ENA | MST_EOPB_ENA;
 639                 else
 640                         master = MST_RD_ENA | MST_EOPB_DIS;
 641
 642                 ep->dev->int_enable |= INT_MSTRDEND;
 643
 644         /* Goku DMA-OUT merges short packets, which plays poorly with
 645          * protocols where short packets mark the transfer boundaries.
 646          * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
 647          * ending transfers after 3 SOFs; we don't turn it on.
 648          */
 649         } else {
 650                 if (unlikely(master & MST_WR_ENA)) {
 651                         DBG (ep->dev, "start, OUT active dma %03x!!\n",
 652                                 master);
 653 //                      return -EL2HLT;
 654                 }
 655                 writel(end, &regs->out_dma_end);
 656                 writel(start, &regs->out_dma_start);
 657
 658                 master &= ~MST_W_BITS;
 659                 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
 660
 661                 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
 662         }
 663
 664         writel(master, &regs->dma_master);
 665         writel(ep->dev->int_enable, &regs->int_enable);
 666         return 0;
 667 }
 668
 669 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
 670 {
 671         struct goku_request             *req;
 672         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 673         u32                             master;
 674
 675         master = readl(&regs->dma_master);
 676
 677         if (unlikely(list_empty(&ep->queue))) {
 678 stop:
 679                 if (ep->is_in)
 680                         dev->int_enable &= ~INT_MSTRDEND;
 681                 else
 682                         dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
 683                 writel(dev->int_enable, &regs->int_enable);
 684                 return;
 685         }
 686         req = list_entry(ep->queue.next, struct goku_request, queue);
 687
 688         /* normal hw dma completion (not abort) */
 689         if (likely(ep->is_in)) {
 690                 if (unlikely(master & MST_RD_ENA))
 691                         return;
 692                 req->req.actual = readl(&regs->in_dma_current);
 693         } else {
 694                 if (unlikely(master & MST_WR_ENA))
 695                         return;
 696
 697                 /* hardware merges short packets, and also hides packet
 698                  * overruns.  a partial packet MAY be in the fifo here.
 699                  */
 700                 req->req.actual = readl(&regs->out_dma_current);
 701         }
 702         req->req.actual -= req->req.dma;
 703         req->req.actual++;
 704
 705 #ifdef USB_TRACE
 706         VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
 707                 ep->ep.name, ep->is_in ? "IN" : "OUT",
 708                 req->req.actual, req->req.length, req);
 709 #endif
 710         done(ep, req, 0);
 711         if (list_empty(&ep->queue))
 712                 goto stop;
 713         req = list_entry(ep->queue.next, struct goku_request, queue);
 714         (void) start_dma(ep, req);
 715 }
 716
 717 static void abort_dma(struct goku_ep *ep, int status)
 718 {
 719         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 720         struct goku_request             *req;
 721         u32                             curr, master;
 722
 723         /* NAK future host requests, hoping the implicit delay lets the
 724          * dma engine finish reading (or writing) its latest packet and
 725          * empty the dma buffer (up to 16 bytes).
 726          *
 727          * This avoids needing to clean up a partial packet in the fifo;
 728          * we can't do that for IN without side effects to HALT and TOGGLE.
 729          */
 730         command(regs, COMMAND_FIFO_DISABLE, ep->num);
 731         req = list_entry(ep->queue.next, struct goku_request, queue);
 732         master = readl(&regs->dma_master) & MST_RW_BITS;
 733
 734         /* FIXME using these resets isn't usably documented. this may
 735          * not work unless it's followed by disabling the endpoint.
 736          *
 737          * FIXME the OUT reset path doesn't even behave consistently.
 738          */
 739         if (ep->is_in) {
 740                 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
 741                         goto finished;
 742                 curr = readl(&regs->in_dma_current);
 743
 744                 writel(curr, &regs->in_dma_end);
 745                 writel(curr, &regs->in_dma_start);
 746
 747                 master &= ~MST_R_BITS;
 748                 master |= MST_RD_RESET;
 749                 writel(master, &regs->dma_master);
 750
 751                 if (readl(&regs->dma_master) & MST_RD_ENA)
 752                         DBG(ep->dev, "IN dma active after reset!\n");
 753
 754         } else {
 755                 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
 756                         goto finished;
 757                 curr = readl(&regs->out_dma_current);
 758
 759                 writel(curr, &regs->out_dma_end);
 760                 writel(curr, &regs->out_dma_start);
 761
 762                 master &= ~MST_W_BITS;
 763                 master |= MST_WR_RESET;
 764                 writel(master, &regs->dma_master);
 765
 766                 if (readl(&regs->dma_master) & MST_WR_ENA)
 767                         DBG(ep->dev, "OUT dma active after reset!\n");
 768         }
 769         req->req.actual = (curr - req->req.dma) + 1;
 770         req->req.status = status;
 771
 772         VDBG(ep->dev, "%s %s %s %d/%d\n", __FUNCTION__, ep->ep.name,
 773                 ep->is_in ? "IN" : "OUT",
 774                 req->req.actual, req->req.length);
 775
 776         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 777
 778         return;
 779
 780 finished:
 781         /* dma already completed; no abort needed */
 782         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 783         req->req.actual = req->req.length;
 784         req->req.status = 0;
 785 }
 786
 787 /*-------------------------------------------------------------------------*/
 788
 789 static int
 790 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 791 {
 792         struct goku_request     *req;
 793         struct goku_ep          *ep;
 794         struct goku_udc         *dev;
 795         unsigned long           flags;
 796         int                     status;
 797
 798         /* always require a cpu-view buffer so pio works */
 799         req = container_of(_req, struct goku_request, req);
 800         if (unlikely(!_req || !_req->complete
 801                         || !_req->buf || !list_empty(&req->queue)))
 802                 return -EINVAL;
 803         ep = container_of(_ep, struct goku_ep, ep);
 804         if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
 805                 return -EINVAL;
 806         dev = ep->dev;
 807         if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
 808                 return -ESHUTDOWN;
 809
 810         /* can't touch registers when suspended */
 811         if (dev->ep0state == EP0_SUSPEND)
 812                 return -EBUSY;
 813
 814         /* set up dma mapping in case the caller didn't */
 815         if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
 816                 _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
 817                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 818                 req->mapped = 1;
 819         }
 820
 821 #ifdef USB_TRACE
 822         VDBG(dev, "%s queue req %p, len %u buf %p\n",
 823                         _ep->name, _req, _req->length, _req->buf);
 824 #endif
 825
 826         spin_lock_irqsave(&dev->lock, flags);
 827
 828         _req->status = -EINPROGRESS;
 829         _req->actual = 0;
 830
 831         /* for ep0 IN without premature status, zlp is required and
 832          * writing EOP starts the status stage (OUT).
 833          */
 834         if (unlikely(ep->num == 0 && ep->is_in))
 835                 _req->zero = 1;
 836
 837         /* kickstart this i/o queue? */
 838         status = 0;
 839         if (list_empty(&ep->queue) && likely(!ep->stopped)) {
 840                 /* dma:  done after dma completion IRQ (or error)
 841                  * pio:  done after last fifo operation
 842                  */
 843                 if (ep->dma)
 844                         status = start_dma(ep, req);
 845                 else
 846                         status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
 847
 848                 if (unlikely(status != 0)) {
 849                         if (status > 0)
 850                                 status = 0;
 851                         req = NULL;
 852                 }
 853
 854         } /* else pio or dma irq handler advances the queue. */
 855
 856         if (likely(req != 0))
 857                 list_add_tail(&req->queue, &ep->queue);
 858
 859         if (likely(!list_empty(&ep->queue))
 860                         && likely(ep->num != 0)
 861                         && !ep->dma
 862                         && !(dev->int_enable & INT_EPxDATASET (ep->num)))
 863                 pio_irq_enable(dev, dev->regs, ep->num);
 864
 865         spin_unlock_irqrestore(&dev->lock, flags);
 866
 867         /* pci writes may still be posted */
 868         return status;
 869 }
 870
 871 /* dequeue ALL requests */
 872 static void nuke(struct goku_ep *ep, int status)
 873 {
 874         struct goku_request     *req;
 875
 876         ep->stopped = 1;
 877         if (list_empty(&ep->queue))
 878                 return;
 879         if (ep->dma)
 880                 abort_dma(ep, status);
 881         while (!list_empty(&ep->queue)) {
 882                 req = list_entry(ep->queue.next, struct goku_request, queue);
 883                 done(ep, req, status);
 884         }
 885 }
 886
 887 /* dequeue JUST ONE request */
 888 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 889 {
 890         struct goku_request     *req;
 891         struct goku_ep          *ep;
 892         struct goku_udc         *dev;
 893         unsigned long           flags;
 894
 895         ep = container_of(_ep, struct goku_ep, ep);
 896         if (!_ep || !_req || (!ep->desc && ep->num != 0))
 897                 return -EINVAL;
 898         dev = ep->dev;
 899         if (!dev->driver)
 900                 return -ESHUTDOWN;
 901
 902         /* we can't touch (dma) registers when suspended */
 903         if (dev->ep0state == EP0_SUSPEND)
 904                 return -EBUSY;
 905
 906         VDBG(dev, "%s %s %s %s %p\n", __FUNCTION__, _ep->name,
 907                 ep->is_in ? "IN" : "OUT",
 908                 ep->dma ? "dma" : "pio",
 909                 _req);
 910
 911         spin_lock_irqsave(&dev->lock, flags);
 912
 913         /* make sure it's actually queued on this endpoint */
 914         list_for_each_entry (req, &ep->queue, queue) {
 915                 if (&req->req == _req)
 916                         break;
 917         }
 918         if (&req->req != _req) {
 919                 spin_unlock_irqrestore (&dev->lock, flags);
 920                 return -EINVAL;
 921         }
 922
 923         if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
 924                 abort_dma(ep, -ECONNRESET);
 925                 done(ep, req, -ECONNRESET);
 926                 dma_advance(dev, ep);
 927         } else if (!list_empty(&req->queue))
 928                 done(ep, req, -ECONNRESET);
 929         else
 930                 req = NULL;
 931         spin_unlock_irqrestore(&dev->lock, flags);
 932
 933         return req ? 0 : -EOPNOTSUPP;
 934 }
 935
 936 /*-------------------------------------------------------------------------*/
 937
 938 static void goku_clear_halt(struct goku_ep *ep)
 939 {
 940         // assert (ep->num !=0)
 941         VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
 942         command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
 943         command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
 944         if (ep->stopped) {
 945                 ep->stopped = 0;
 946                 if (ep->dma) {
 947                         struct goku_request     *req;
 948
 949                         if (list_empty(&ep->queue))
 950                                 return;
 951                         req = list_entry(ep->queue.next, struct goku_request,
 952                                                 queue);
 953                         (void) start_dma(ep, req);
 954                 } else
 955                         pio_advance(ep);
 956         }
 957 }
 958
 959 static int goku_set_halt(struct usb_ep *_ep, int value)
 960 {
 961         struct goku_ep  *ep;
 962         unsigned long   flags;
 963         int             retval = 0;
 964
 965         if (!_ep)
 966                 return -ENODEV;
 967         ep = container_of (_ep, struct goku_ep, ep);
 968
 969         if (ep->num == 0) {
 970                 if (value) {
 971                         ep->dev->ep0state = EP0_STALL;
 972                         ep->dev->ep[0].stopped = 1;
 973                 } else
 974                         return -EINVAL;
 975
 976         /* don't change EPxSTATUS_EP_INVALID to READY */
 977         } else if (!ep->desc) {
 978                 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
 979                 return -EINVAL;
 980         }
 981
 982         spin_lock_irqsave(&ep->dev->lock, flags);
 983         if (!list_empty(&ep->queue))
 984                 retval = -EAGAIN;
 985         else if (ep->is_in && value
 986                         /* data in (either) packet buffer? */
 987                         && (readl(&ep->dev->regs->DataSet)
 988                                         & DATASET_AB(ep->num)))
 989                 retval = -EAGAIN;
 990         else if (!value)
 991                 goku_clear_halt(ep);
 992         else {
 993                 ep->stopped = 1;
 994                 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
 995                 command(ep->dev->regs, COMMAND_STALL, ep->num);
 996                 readl(ep->reg_status);
 997         }
 998         spin_unlock_irqrestore(&ep->dev->lock, flags);
 999         return retval;
1000 }
1001
1002 static int goku_fifo_status(struct usb_ep *_ep)
1003 {
1004         struct goku_ep                  *ep;
1005         struct goku_udc_regs __iomem    *regs;
1006         u32                             size;
1007
1008         if (!_ep)
1009                 return -ENODEV;
1010         ep = container_of(_ep, struct goku_ep, ep);
1011
1012         /* size is only reported sanely for OUT */
1013         if (ep->is_in)
1014                 return -EOPNOTSUPP;
1015
1016         /* ignores 16-byte dma buffer; SizeH == 0 */
1017         regs = ep->dev->regs;
1018         size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
1019         size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
1020         VDBG(ep->dev, "%s %s %u\n", __FUNCTION__, ep->ep.name, size);
1021         return size;
1022 }
1023
1024 static void goku_fifo_flush(struct usb_ep *_ep)
1025 {
1026         struct goku_ep                  *ep;
1027         struct goku_udc_regs __iomem    *regs;
1028         u32                             size;
1029
1030         if (!_ep)
1031                 return;
1032         ep = container_of(_ep, struct goku_ep, ep);
1033         VDBG(ep->dev, "%s %s\n", __FUNCTION__, ep->ep.name);
1034
1035         /* don't change EPxSTATUS_EP_INVALID to READY */
1036         if (!ep->desc && ep->num != 0) {
1037                 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
1038                 return;
1039         }
1040
1041         regs = ep->dev->regs;
1042         size = readl(&regs->EPxSizeLA[ep->num]);
1043         size &= DATASIZE;
1044
1045         /* Non-desirable behavior:  FIFO_CLEAR also clears the
1046          * endpoint halt feature.  For OUT, we _could_ just read
1047          * the bytes out (PIO, if !ep->dma); for in, no choice.
1048          */
1049         if (size)
1050                 command(regs, COMMAND_FIFO_CLEAR, ep->num);
1051 }
1052
1053 static struct usb_ep_ops goku_ep_ops = {
1054         .enable         = goku_ep_enable,
1055         .disable        = goku_ep_disable,
1056
1057         .alloc_request  = goku_alloc_request,
1058         .free_request   = goku_free_request,
1059
1060         .alloc_buffer   = goku_alloc_buffer,
1061         .free_buffer    = goku_free_buffer,
1062
1063         .queue          = goku_queue,
1064         .dequeue        = goku_dequeue,
1065
1066         .set_halt       = goku_set_halt,
1067         .fifo_status    = goku_fifo_status,
1068         .fifo_flush     = goku_fifo_flush,
1069 };
1070
1071 /*-------------------------------------------------------------------------*/
1072
1073 static int goku_get_frame(struct usb_gadget *_gadget)
1074 {
1075         return -EOPNOTSUPP;
1076 }
1077
1078 static const struct usb_gadget_ops goku_ops = {
1079         .get_frame      = goku_get_frame,
1080         // no remote wakeup
1081         // not selfpowered
1082 };
1083
1084 /*-------------------------------------------------------------------------*/
1085
1086 static inline char *dmastr(void)
1087 {
1088         if (use_dma == 0)
1089                 return "(dma disabled)";
1090         else if (use_dma == 2)
1091                 return "(dma IN and OUT)";
1092         else
1093                 return "(dma IN)";
1094 }
1095
1096 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1097
1098 static const char proc_node_name [] = "driver/udc";
1099
1100 #define FOURBITS "%s%s%s%s"
1101 #define EIGHTBITS FOURBITS FOURBITS
1102
1103 static void
1104 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1105 {
1106         int t;
1107
1108         /* int_status is the same format ... */
1109         t = scnprintf(*next, *size,
1110                 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1111                 label, mask,
1112                 (mask & INT_PWRDETECT) ? " power" : "",
1113                 (mask & INT_SYSERROR) ? " sys" : "",
1114                 (mask & INT_MSTRDEND) ? " in-dma" : "",
1115                 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1116
1117                 (mask & INT_MSTWREND) ? " out-dma" : "",
1118                 (mask & INT_MSTWRSET) ? " wrset" : "",
1119                 (mask & INT_ERR) ? " err" : "",
1120                 (mask & INT_SOF) ? " sof" : "",
1121
1122                 (mask & INT_EP3NAK) ? " ep3nak" : "",
1123                 (mask & INT_EP2NAK) ? " ep2nak" : "",
1124                 (mask & INT_EP1NAK) ? " ep1nak" : "",
1125                 (mask & INT_EP3DATASET) ? " ep3" : "",
1126
1127                 (mask & INT_EP2DATASET) ? " ep2" : "",
1128                 (mask & INT_EP1DATASET) ? " ep1" : "",
1129                 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1130                 (mask & INT_STATUS) ? " ep0status" : "",
1131
1132                 (mask & INT_SETUP) ? " setup" : "",
1133                 (mask & INT_ENDPOINT0) ? " ep0" : "",
1134                 (mask & INT_USBRESET) ? " reset" : "",
1135                 (mask & INT_SUSPEND) ? " suspend" : "");
1136         *size -= t;
1137         *next += t;
1138 }
1139
1140
1141 static int
1142 udc_proc_read(char *buffer, char **start, off_t off, int count,
1143                 int *eof, void *_dev)
1144 {
1145         char                            *buf = buffer;
1146         struct goku_udc                 *dev = _dev;
1147         struct goku_udc_regs __iomem    *regs = dev->regs;
1148         char                            *next = buf;
1149         unsigned                        size = count;
1150         unsigned long                   flags;
1151         int                             i, t, is_usb_connected;
1152         u32                             tmp;
1153
1154         if (off != 0)
1155                 return 0;
1156
1157         local_irq_save(flags);
1158
1159         /* basic device status */
1160         tmp = readl(&regs->power_detect);
1161         is_usb_connected = tmp & PW_DETECT;
1162         t = scnprintf(next, size,
1163                 "%s - %s\n"
1164                 "%s version: %s %s\n"
1165                 "Gadget driver: %s\n"
1166                 "Host %s, %s\n"
1167                 "\n",
1168                 pci_name(dev->pdev), driver_desc,
1169                 driver_name, DRIVER_VERSION, dmastr(),
1170                 dev->driver ? dev->driver->driver.name : "(none)",
1171                 is_usb_connected
1172                         ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1173                         : "disconnected",
1174                 ({char *tmp;
1175                 switch(dev->ep0state){
1176                 case EP0_DISCONNECT:    tmp = "ep0_disconnect"; break;
1177                 case EP0_IDLE:          tmp = "ep0_idle"; break;
1178                 case EP0_IN:            tmp = "ep0_in"; break;
1179                 case EP0_OUT:           tmp = "ep0_out"; break;
1180                 case EP0_STATUS:        tmp = "ep0_status"; break;
1181                 case EP0_STALL:         tmp = "ep0_stall"; break;
1182                 case EP0_SUSPEND:       tmp = "ep0_suspend"; break;
1183                 default:                tmp = "ep0_?"; break;
1184                 } tmp; })
1185                 );
1186         size -= t;
1187         next += t;
1188
1189         dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1190         dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1191
1192         if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1193                 goto done;
1194
1195         /* registers for (active) device and ep0 */
1196         t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1197                         "single.bcs %02x.%02x state %x addr %u\n",
1198                         dev->irqs, readl(&regs->DataSet),
1199                         readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1200                         readl(&regs->UsbState),
1201                         readl(&regs->address));
1202         size -= t;
1203         next += t;
1204
1205         tmp = readl(&regs->dma_master);
1206         t = scnprintf(next, size,
1207                 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1208                 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1209                 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1210                 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1211                 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1212
1213                 (tmp & MST_RD_EOPB) ? " eopb" : "",
1214                 (tmp & MST_RD_RESET) ? " in_reset" : "",
1215                 (tmp & MST_WR_RESET) ? " out_reset" : "",
1216                 (tmp & MST_RD_ENA) ? " IN" : "",
1217
1218                 (tmp & MST_WR_ENA) ? " OUT" : "",
1219                 (tmp & MST_CONNECTION)
1220                         ? "ep1in/ep2out"
1221                         : "ep1out/ep2in");
1222         size -= t;
1223         next += t;
1224
1225         /* dump endpoint queues */
1226         for (i = 0; i < 4; i++) {
1227                 struct goku_ep          *ep = &dev->ep [i];
1228                 struct goku_request     *req;
1229                 int                     t;
1230
1231                 if (i && !ep->desc)
1232                         continue;
1233
1234                 tmp = readl(ep->reg_status);
1235                 t = scnprintf(next, size,
1236                         "%s %s max %u %s, irqs %lu, "
1237                         "status %02x (%s) " FOURBITS "\n",
1238                         ep->ep.name,
1239                         ep->is_in ? "in" : "out",
1240                         ep->ep.maxpacket,
1241                         ep->dma ? "dma" : "pio",
1242                         ep->irqs,
1243                         tmp, ({ char *s;
1244                         switch (tmp & EPxSTATUS_EP_MASK) {
1245                         case EPxSTATUS_EP_READY:
1246                                 s = "ready"; break;
1247                         case EPxSTATUS_EP_DATAIN:
1248                                 s = "packet"; break;
1249                         case EPxSTATUS_EP_FULL:
1250                                 s = "full"; break;
1251                         case EPxSTATUS_EP_TX_ERR:       // host will retry
1252                                 s = "tx_err"; break;
1253                         case EPxSTATUS_EP_RX_ERR:
1254                                 s = "rx_err"; break;
1255                         case EPxSTATUS_EP_BUSY:         /* ep0 only */
1256                                 s = "busy"; break;
1257                         case EPxSTATUS_EP_STALL:
1258                                 s = "stall"; break;
1259                         case EPxSTATUS_EP_INVALID:      // these "can't happen"
1260                                 s = "invalid"; break;
1261                         default:
1262                                 s = "?"; break;
1263                         }; s; }),
1264                         (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1265                         (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1266                         (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1267                         (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1268                         );
1269                 if (t <= 0 || t > size)
1270                         goto done;
1271                 size -= t;
1272                 next += t;
1273
1274                 if (list_empty(&ep->queue)) {
1275                         t = scnprintf(next, size, "\t(nothing queued)\n");
1276                         if (t <= 0 || t > size)
1277                                 goto done;
1278                         size -= t;
1279                         next += t;
1280                         continue;
1281                 }
1282                 list_for_each_entry(req, &ep->queue, queue) {
1283                         if (ep->dma && req->queue.prev == &ep->queue) {
1284                                 if (i == UDC_MSTRD_ENDPOINT)
1285                                         tmp = readl(&regs->in_dma_current);
1286                                 else
1287                                         tmp = readl(&regs->out_dma_current);
1288                                 tmp -= req->req.dma;
1289                                 tmp++;
1290                         } else
1291                                 tmp = req->req.actual;
1292
1293                         t = scnprintf(next, size,
1294                                 "\treq %p len %u/%u buf %p\n",
1295                                 &req->req, tmp, req->req.length,
1296                                 req->req.buf);
1297                         if (t <= 0 || t > size)
1298                                 goto done;
1299                         size -= t;
1300                         next += t;
1301                 }
1302         }
1303
1304 done:
1305         local_irq_restore(flags);
1306         *eof = 1;
1307         return count - size;
1308 }
1309
1310 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1311
1312 /*-------------------------------------------------------------------------*/
1313
1314 static void udc_reinit (struct goku_udc *dev)
1315 {
1316         static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1317
1318         unsigned i;
1319
1320         INIT_LIST_HEAD (&dev->gadget.ep_list);
1321         dev->gadget.ep0 = &dev->ep [0].ep;
1322         dev->gadget.speed = USB_SPEED_UNKNOWN;
1323         dev->ep0state = EP0_DISCONNECT;
1324         dev->irqs = 0;
1325
1326         for (i = 0; i < 4; i++) {
1327                 struct goku_ep  *ep = &dev->ep[i];
1328
1329                 ep->num = i;
1330                 ep->ep.name = names[i];
1331                 ep->reg_fifo = &dev->regs->ep_fifo [i];
1332                 ep->reg_status = &dev->regs->ep_status [i];
1333                 ep->reg_mode = &dev->regs->ep_mode[i];
1334
1335                 ep->ep.ops = &goku_ep_ops;
1336                 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1337                 ep->dev = dev;
1338                 INIT_LIST_HEAD (&ep->queue);
1339
1340                 ep_reset(NULL, ep);
1341         }
1342
1343         dev->ep[0].reg_mode = NULL;
1344         dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1345         list_del_init (&dev->ep[0].ep.ep_list);
1346 }
1347
1348 static void udc_reset(struct goku_udc *dev)
1349 {
1350         struct goku_udc_regs __iomem    *regs = dev->regs;
1351
1352         writel(0, &regs->power_detect);
1353         writel(0, &regs->int_enable);
1354         readl(&regs->int_enable);
1355         dev->int_enable = 0;
1356
1357         /* deassert reset, leave USB D+ at hi-Z (no pullup)
1358          * don't let INT_PWRDETECT sequence begin
1359          */
1360         udelay(250);
1361         writel(PW_RESETB, &regs->power_detect);
1362         readl(&regs->int_enable);
1363 }
1364
1365 static void ep0_start(struct goku_udc *dev)
1366 {
1367         struct goku_udc_regs __iomem    *regs = dev->regs;
1368         unsigned                        i;
1369
1370         VDBG(dev, "%s\n", __FUNCTION__);
1371
1372         udc_reset(dev);
1373         udc_reinit (dev);
1374         //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1375
1376         /* hw handles set_address, set_feature, get_status; maybe more */
1377         writel(   G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1378                 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1379                 | G_REQMODE_GET_DESC
1380                 | G_REQMODE_CLEAR_FEAT
1381                 , &regs->reqmode);
1382
1383         for (i = 0; i < 4; i++)
1384                 dev->ep[i].irqs = 0;
1385
1386         /* can't modify descriptors after writing UsbReady */
1387         for (i = 0; i < DESC_LEN; i++)
1388                 writel(0, &regs->descriptors[i]);
1389         writel(0, &regs->UsbReady);
1390
1391         /* expect ep0 requests when the host drops reset */
1392         writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1393         dev->int_enable = INT_DEVWIDE | INT_EP0;
1394         writel(dev->int_enable, &dev->regs->int_enable);
1395         readl(&regs->int_enable);
1396         dev->gadget.speed = USB_SPEED_FULL;
1397         dev->ep0state = EP0_IDLE;
1398 }
1399
1400 static void udc_enable(struct goku_udc *dev)
1401 {
1402         /* start enumeration now, or after power detect irq */
1403         if (readl(&dev->regs->power_detect) & PW_DETECT)
1404                 ep0_start(dev);
1405         else {
1406                 DBG(dev, "%s\n", __FUNCTION__);
1407                 dev->int_enable = INT_PWRDETECT;
1408                 writel(dev->int_enable, &dev->regs->int_enable);
1409         }
1410 }
1411
1412 /*-------------------------------------------------------------------------*/
1413
1414 /* keeping it simple:
1415  * - one bus driver, initted first;
1416  * - one function driver, initted second
1417  */
1418
1419 static struct goku_udc  *the_controller;
1420
1421 /* when a driver is successfully registered, it will receive
1422  * control requests including set_configuration(), which enables
1423  * non-control requests.  then usb traffic follows until a
1424  * disconnect is reported.  then a host may connect again, or
1425  * the driver might get unbound.
1426  */
1427 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1428 {
1429         struct goku_udc *dev = the_controller;
1430         int                     retval;
1431
1432         if (!driver
1433                         || driver->speed != USB_SPEED_FULL
1434                         || !driver->bind
1435                         || !driver->unbind
1436                         || !driver->disconnect
1437                         || !driver->setup)
1438                 return -EINVAL;
1439         if (!dev)
1440                 return -ENODEV;
1441         if (dev->driver)
1442                 return -EBUSY;
1443
1444         /* hook up the driver */
1445         driver->driver.bus = NULL;
1446         dev->driver = driver;
1447         dev->gadget.dev.driver = &driver->driver;
1448         retval = driver->bind(&dev->gadget);
1449         if (retval) {
1450                 DBG(dev, "bind to driver %s --> error %d\n",
1451                                 driver->driver.name, retval);
1452                 dev->driver = NULL;
1453                 dev->gadget.dev.driver = NULL;
1454                 return retval;
1455         }
1456
1457         /* then enable host detection and ep0; and we're ready
1458          * for set_configuration as well as eventual disconnect.
1459          */
1460         udc_enable(dev);
1461
1462         DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1463         return 0;
1464 }
1465 EXPORT_SYMBOL(usb_gadget_register_driver);
1466
1467 static void
1468 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1469 {
1470         unsigned        i;
1471
1472         DBG (dev, "%s\n", __FUNCTION__);
1473
1474         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1475                 driver = NULL;
1476
1477         /* disconnect gadget driver after quiesceing hw and the driver */
1478         udc_reset (dev);
1479         for (i = 0; i < 4; i++)
1480                 nuke(&dev->ep [i], -ESHUTDOWN);
1481         if (driver) {
1482                 spin_unlock(&dev->lock);
1483                 driver->disconnect(&dev->gadget);
1484                 spin_lock(&dev->lock);
1485         }
1486
1487         if (dev->driver)
1488                 udc_enable(dev);
1489 }
1490
1491 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1492 {
1493         struct goku_udc *dev = the_controller;
1494         unsigned long   flags;
1495
1496         if (!dev)
1497                 return -ENODEV;
1498         if (!driver || driver != dev->driver)
1499                 return -EINVAL;
1500
1501         spin_lock_irqsave(&dev->lock, flags);
1502         dev->driver = NULL;
1503         stop_activity(dev, driver);
1504         spin_unlock_irqrestore(&dev->lock, flags);
1505
1506         driver->unbind(&dev->gadget);
1507
1508         DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1509         return 0;
1510 }
1511 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1512
1513
1514 /*-------------------------------------------------------------------------*/
1515
1516 static void ep0_setup(struct goku_udc *dev)
1517 {
1518         struct goku_udc_regs __iomem    *regs = dev->regs;
1519         struct usb_ctrlrequest          ctrl;
1520         int                             tmp;
1521
1522         /* read SETUP packet and enter DATA stage */
1523         ctrl.bRequestType = readl(&regs->bRequestType);
1524         ctrl.bRequest = readl(&regs->bRequest);
1525         ctrl.wValue  = cpu_to_le16((readl(&regs->wValueH)  << 8)
1526                                         | readl(&regs->wValueL));
1527         ctrl.wIndex  = cpu_to_le16((readl(&regs->wIndexH)  << 8)
1528                                         | readl(&regs->wIndexL));
1529         ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1530                                         | readl(&regs->wLengthL));
1531         writel(0, &regs->SetupRecv);
1532
1533         nuke(&dev->ep[0], 0);
1534         dev->ep[0].stopped = 0;
1535         if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1536                 dev->ep[0].is_in = 1;
1537                 dev->ep0state = EP0_IN;
1538                 /* detect early status stages */
1539                 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1540         } else {
1541                 dev->ep[0].is_in = 0;
1542                 dev->ep0state = EP0_OUT;
1543
1544                 /* NOTE:  CLEAR_FEATURE is done in software so that we can
1545                  * synchronize transfer restarts after bulk IN stalls.  data
1546                  * won't even enter the fifo until the halt is cleared.
1547                  */
1548                 switch (ctrl.bRequest) {
1549                 case USB_REQ_CLEAR_FEATURE:
1550                         switch (ctrl.bRequestType) {
1551                         case USB_RECIP_ENDPOINT:
1552                                 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1553                                 /* active endpoint */
1554                                 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1555                                         goto stall;
1556                                 if (ctrl.wIndex & __constant_cpu_to_le16(
1557                                                 USB_DIR_IN)) {
1558                                         if (!dev->ep[tmp].is_in)
1559                                                 goto stall;
1560                                 } else {
1561                                         if (dev->ep[tmp].is_in)
1562                                                 goto stall;
1563                                 }
1564                                 if (ctrl.wValue != __constant_cpu_to_le16(
1565                                                 USB_ENDPOINT_HALT))
1566                                         goto stall;
1567                                 if (tmp)
1568                                         goku_clear_halt(&dev->ep[tmp]);
1569 succeed:
1570                                 /* start ep0out status stage */
1571                                 writel(~(1<<0), &regs->EOP);
1572                                 dev->ep[0].stopped = 1;
1573                                 dev->ep0state = EP0_STATUS;
1574                                 return;
1575                         case USB_RECIP_DEVICE:
1576                                 /* device remote wakeup: always clear */
1577                                 if (ctrl.wValue != __constant_cpu_to_le16(1))
1578                                         goto stall;
1579                                 VDBG(dev, "clear dev remote wakeup\n");
1580                                 goto succeed;
1581                         case USB_RECIP_INTERFACE:
1582                                 goto stall;
1583                         default:                /* pass to gadget driver */
1584                                 break;
1585                         }
1586                         break;
1587                 default:
1588                         break;
1589                 }
1590         }
1591
1592 #ifdef USB_TRACE
1593         VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1594                 ctrl.bRequestType, ctrl.bRequest,
1595                 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1596                 le16_to_cpu(ctrl.wLength));
1597 #endif
1598
1599         /* hw wants to know when we're configured (or not) */
1600         dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1601                                 && ctrl.bRequestType == USB_RECIP_DEVICE);
1602         if (unlikely(dev->req_config))
1603                 dev->configured = (ctrl.wValue != __constant_cpu_to_le16(0));
1604
1605         /* delegate everything to the gadget driver.
1606          * it may respond after this irq handler returns.
1607          */
1608         spin_unlock (&dev->lock);
1609         tmp = dev->driver->setup(&dev->gadget, &ctrl);
1610         spin_lock (&dev->lock);
1611         if (unlikely(tmp < 0)) {
1612 stall:
1613 #ifdef USB_TRACE
1614                 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1615                                 ctrl.bRequestType, ctrl.bRequest, tmp);
1616 #endif
1617                 command(regs, COMMAND_STALL, 0);
1618                 dev->ep[0].stopped = 1;
1619                 dev->ep0state = EP0_STALL;
1620         }
1621
1622         /* expect at least one data or status stage irq */
1623 }
1624
1625 #define ACK(irqbit) { \
1626                 stat &= ~irqbit; \
1627                 writel(~irqbit, &regs->int_status); \
1628                 handled = 1; \
1629                 }
1630
1631 static irqreturn_t goku_irq(int irq, void *_dev, struct pt_regs *r)
1632 {
1633         struct goku_udc                 *dev = _dev;
1634         struct goku_udc_regs __iomem    *regs = dev->regs;
1635         struct goku_ep                  *ep;
1636         u32                             stat, handled = 0;
1637         unsigned                        i, rescans = 5;
1638
1639         spin_lock(&dev->lock);
1640
1641 rescan:
1642         stat = readl(&regs->int_status) & dev->int_enable;
1643         if (!stat)
1644                 goto done;
1645         dev->irqs++;
1646
1647         /* device-wide irqs */
1648         if (unlikely(stat & INT_DEVWIDE)) {
1649                 if (stat & INT_SYSERROR) {
1650                         ERROR(dev, "system error\n");
1651                         stop_activity(dev, dev->driver);
1652                         stat = 0;
1653                         handled = 1;
1654                         // FIXME have a neater way to prevent re-enumeration
1655                         dev->driver = NULL;
1656                         goto done;
1657                 }
1658                 if (stat & INT_PWRDETECT) {
1659                         writel(~stat, &regs->int_status);
1660                         if (readl(&dev->regs->power_detect) & PW_DETECT) {
1661                                 VDBG(dev, "connect\n");
1662                                 ep0_start(dev);
1663                         } else {
1664                                 DBG(dev, "disconnect\n");
1665                                 if (dev->gadget.speed == USB_SPEED_FULL)
1666                                         stop_activity(dev, dev->driver);
1667                                 dev->ep0state = EP0_DISCONNECT;
1668                                 dev->int_enable = INT_DEVWIDE;
1669                                 writel(dev->int_enable, &dev->regs->int_enable);
1670                         }
1671                         stat = 0;
1672                         handled = 1;
1673                         goto done;
1674                 }
1675                 if (stat & INT_SUSPEND) {
1676                         ACK(INT_SUSPEND);
1677                         if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1678                                 switch (dev->ep0state) {
1679                                 case EP0_DISCONNECT:
1680                                 case EP0_SUSPEND:
1681                                         goto pm_next;
1682                                 default:
1683                                         break;
1684                                 }
1685                                 DBG(dev, "USB suspend\n");
1686                                 dev->ep0state = EP0_SUSPEND;
1687                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1688                                                 && dev->driver
1689                                                 && dev->driver->suspend) {
1690                                         spin_unlock(&dev->lock);
1691                                         dev->driver->suspend(&dev->gadget);
1692                                         spin_lock(&dev->lock);
1693                                 }
1694                         } else {
1695                                 if (dev->ep0state != EP0_SUSPEND) {
1696                                         DBG(dev, "bogus USB resume %d\n",
1697                                                 dev->ep0state);
1698                                         goto pm_next;
1699                                 }
1700                                 DBG(dev, "USB resume\n");
1701                                 dev->ep0state = EP0_IDLE;
1702                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1703                                                 && dev->driver
1704                                                 && dev->driver->resume) {
1705                                         spin_unlock(&dev->lock);
1706                                         dev->driver->resume(&dev->gadget);
1707                                         spin_lock(&dev->lock);
1708                                 }
1709                         }
1710                 }
1711 pm_next:
1712                 if (stat & INT_USBRESET) {              /* hub reset done */
1713                         ACK(INT_USBRESET);
1714                         INFO(dev, "USB reset done, gadget %s\n",
1715                                 dev->driver->driver.name);
1716                 }
1717                 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1718         }
1719
1720         /* progress ep0 setup, data, or status stages.
1721          * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1722          */
1723         if (stat & INT_SETUP) {
1724                 ACK(INT_SETUP);
1725                 dev->ep[0].irqs++;
1726                 ep0_setup(dev);
1727         }
1728         if (stat & INT_STATUSNAK) {
1729                 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1730                 if (dev->ep0state == EP0_IN) {
1731                         ep = &dev->ep[0];
1732                         ep->irqs++;
1733                         nuke(ep, 0);
1734                         writel(~(1<<0), &regs->EOP);
1735                         dev->ep0state = EP0_STATUS;
1736                 }
1737         }
1738         if (stat & INT_ENDPOINT0) {
1739                 ACK(INT_ENDPOINT0);
1740                 ep = &dev->ep[0];
1741                 ep->irqs++;
1742                 pio_advance(ep);
1743         }
1744
1745         /* dma completion */
1746         if (stat & INT_MSTRDEND) {      /* IN */
1747                 ACK(INT_MSTRDEND);
1748                 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1749                 ep->irqs++;
1750                 dma_advance(dev, ep);
1751         }
1752         if (stat & INT_MSTWREND) {      /* OUT */
1753                 ACK(INT_MSTWREND);
1754                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1755                 ep->irqs++;
1756                 dma_advance(dev, ep);
1757         }
1758         if (stat & INT_MSTWRTMOUT) {    /* OUT */
1759                 ACK(INT_MSTWRTMOUT);
1760                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1761                 ep->irqs++;
1762                 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1763                 // reset dma? then dma_advance()
1764         }
1765
1766         /* pio */
1767         for (i = 1; i < 4; i++) {
1768                 u32             tmp = INT_EPxDATASET(i);
1769
1770                 if (!(stat & tmp))
1771                         continue;
1772                 ep = &dev->ep[i];
1773                 pio_advance(ep);
1774                 if (list_empty (&ep->queue))
1775                         pio_irq_disable(dev, regs, i);
1776                 stat &= ~tmp;
1777                 handled = 1;
1778                 ep->irqs++;
1779         }
1780
1781         if (rescans--)
1782                 goto rescan;
1783
1784 done:
1785         (void)readl(&regs->int_enable);
1786         spin_unlock(&dev->lock);
1787         if (stat)
1788                 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1789                                 readl(&regs->int_status), dev->int_enable);
1790         return IRQ_RETVAL(handled);
1791 }
1792
1793 #undef ACK
1794
1795 /*-------------------------------------------------------------------------*/
1796
1797 static void gadget_release(struct device *_dev)
1798 {
1799         struct goku_udc *dev = dev_get_drvdata(_dev);
1800
1801         kfree(dev);
1802 }
1803
1804 /* tear down the binding between this driver and the pci device */
1805
1806 static void goku_remove(struct pci_dev *pdev)
1807 {
1808         struct goku_udc         *dev = pci_get_drvdata(pdev);
1809
1810         DBG(dev, "%s\n", __FUNCTION__);
1811         /* start with the driver above us */
1812         if (dev->driver) {
1813                 /* should have been done already by driver model core */
1814                 WARN(dev, "pci remove, driver '%s' is still registered\n",
1815                                 dev->driver->driver.name);
1816                 usb_gadget_unregister_driver(dev->driver);
1817         }
1818
1819 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1820         remove_proc_entry(proc_node_name, NULL);
1821 #endif
1822         if (dev->regs)
1823                 udc_reset(dev);
1824         if (dev->got_irq)
1825                 free_irq(pdev->irq, dev);
1826         if (dev->regs)
1827                 iounmap(dev->regs);
1828         if (dev->got_region)
1829                 release_mem_region(pci_resource_start (pdev, 0),
1830                                 pci_resource_len (pdev, 0));
1831         if (dev->enabled)
1832                 pci_disable_device(pdev);
1833         device_unregister(&dev->gadget.dev);
1834
1835         pci_set_drvdata(pdev, NULL);
1836         dev->regs = NULL;
1837         the_controller = NULL;
1838
1839         INFO(dev, "unbind\n");
1840 }
1841
1842 /* wrap this driver around the specified pci device, but
1843  * don't respond over USB until a gadget driver binds to us.
1844  */
1845
1846 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1847 {
1848         struct goku_udc         *dev = NULL;
1849         unsigned long           resource, len;
1850         void __iomem            *base = NULL;
1851         int                     retval;
1852
1853         /* if you want to support more than one controller in a system,
1854          * usb_gadget_driver_{register,unregister}() must change.
1855          */
1856         if (the_controller) {
1857                 WARN(dev, "ignoring %s\n", pci_name(pdev));
1858                 return -EBUSY;
1859         }
1860         if (!pdev->irq) {
1861                 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1862                 retval = -ENODEV;
1863                 goto done;
1864         }
1865
1866         /* alloc, and start init */
1867         dev = kmalloc (sizeof *dev, SLAB_KERNEL);
1868         if (dev == NULL){
1869                 pr_debug("enomem %s\n", pci_name(pdev));
1870                 retval = -ENOMEM;
1871                 goto done;
1872         }
1873
1874         memset(dev, 0, sizeof *dev);
1875         spin_lock_init(&dev->lock);
1876         dev->pdev = pdev;
1877         dev->gadget.ops = &goku_ops;
1878
1879         /* the "gadget" abstracts/virtualizes the controller */
1880         strcpy(dev->gadget.dev.bus_id, "gadget");
1881         dev->gadget.dev.parent = &pdev->dev;
1882         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1883         dev->gadget.dev.release = gadget_release;
1884         dev->gadget.name = driver_name;
1885
1886         /* now all the pci goodies ... */
1887         retval = pci_enable_device(pdev);
1888         if (retval < 0) {
1889                 DBG(dev, "can't enable, %d\n", retval);
1890                 goto done;
1891         }
1892         dev->enabled = 1;
1893
1894         resource = pci_resource_start(pdev, 0);
1895         len = pci_resource_len(pdev, 0);
1896         if (!request_mem_region(resource, len, driver_name)) {
1897                 DBG(dev, "controller already in use\n");
1898                 retval = -EBUSY;
1899                 goto done;
1900         }
1901         dev->got_region = 1;
1902
1903         base = ioremap_nocache(resource, len);
1904         if (base == NULL) {
1905                 DBG(dev, "can't map memory\n");
1906                 retval = -EFAULT;
1907                 goto done;
1908         }
1909         dev->regs = (struct goku_udc_regs __iomem *) base;
1910
1911         pci_set_drvdata(pdev, dev);
1912         INFO(dev, "%s\n", driver_desc);
1913         INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1914         INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1915
1916         /* init to known state, then setup irqs */
1917         udc_reset(dev);
1918         udc_reinit (dev);
1919         if (request_irq(pdev->irq, goku_irq, IRQF_SHARED/*|IRQF_SAMPLE_RANDOM*/,
1920                         driver_name, dev) != 0) {
1921                 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1922                 retval = -EBUSY;
1923                 goto done;
1924         }
1925         dev->got_irq = 1;
1926         if (use_dma)
1927                 pci_set_master(pdev);
1928
1929
1930 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1931         create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1932 #endif
1933
1934         /* done */
1935         the_controller = dev;
1936         device_register(&dev->gadget.dev);
1937
1938         return 0;
1939
1940 done:
1941         if (dev)
1942                 goku_remove (pdev);
1943         return retval;
1944 }
1945
1946
1947 /*-------------------------------------------------------------------------*/
1948
1949 static struct pci_device_id pci_ids [] = { {
1950         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1951         .class_mask =   ~0,
1952         .vendor =       0x102f,         /* Toshiba */
1953         .device =       0x0107,         /* this UDC */
1954         .subvendor =    PCI_ANY_ID,
1955         .subdevice =    PCI_ANY_ID,
1956
1957 }, { /* end: all zeroes */ }
1958 };
1959 MODULE_DEVICE_TABLE (pci, pci_ids);
1960
1961 static struct pci_driver goku_pci_driver = {
1962         .name =         (char *) driver_name,
1963         .id_table =     pci_ids,
1964
1965         .probe =        goku_probe,
1966         .remove =       goku_remove,
1967
1968         /* FIXME add power management support */
1969 };
1970
1971 static int __init init (void)
1972 {
1973         return pci_register_driver (&goku_pci_driver);
1974 }
1975 module_init (init);
1976
1977 static void __exit cleanup (void)
1978 {
1979         pci_unregister_driver (&goku_pci_driver);
1980 }
1981 module_exit (cleanup);