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/slab.h>
  33 #include <linux/smp_lock.h>
  34 #include <linux/errno.h>
  35 #include <linux/init.h>
  36 #include <linux/timer.h>
  37 #include <linux/list.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/device.h>
  41 #include <linux/usb/ch9.h>
  42 #include <linux/usb_gadget.h>
  43
  44 #include <asm/byteorder.h>
  45 #include <asm/io.h>
  46 #include <asm/irq.h>
  47 #include <asm/system.h>
  48 #include <asm/unaligned.h>
  49
  50
  51 #include "goku_udc.h"
  52
  53 #define DRIVER_DESC             "TC86C001 USB Device Controller"
  54 #define DRIVER_VERSION          "30-Oct 2003"
  55
  56 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
  57
  58 static const char driver_name [] = "goku_udc";
  59 static const char driver_desc [] = DRIVER_DESC;
  60
  61 MODULE_AUTHOR("source@mvista.com");
  62 MODULE_DESCRIPTION(DRIVER_DESC);
  63 MODULE_LICENSE("GPL");
  64
  65
  66 /*
  67  * IN dma behaves ok under testing, though the IN-dma abort paths don't
  68  * seem to behave quite as expected.  Used by default.
  69  *
  70  * OUT dma documents design problems handling the common "short packet"
  71  * transfer termination policy; it couldn't be enabled by default, even
  72  * if the OUT-dma abort problems had a resolution.
  73  */
  74 static unsigned use_dma = 1;
  75
  76 #if 0
  77 //#include <linux/moduleparam.h>
  78 /* "modprobe goku_udc use_dma=1" etc
  79  *      0 to disable dma
  80  *      1 to use IN dma only (normal operation)
  81  *      2 to use IN and OUT dma
  82  */
  83 module_param(use_dma, uint, S_IRUGO);
  84 #endif
  85
  86 /*-------------------------------------------------------------------------*/
  87
  88 static void nuke(struct goku_ep *, int status);
  89
  90 static inline void
  91 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
  92 {
  93         writel(COMMAND_EP(epnum) | command, &regs->Command);
  94         udelay(300);
  95 }
  96
  97 static int
  98 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
  99 {
 100         struct goku_udc *dev;
 101         struct goku_ep  *ep;
 102         u32             mode;
 103         u16             max;
 104         unsigned long   flags;
 105
 106         ep = container_of(_ep, struct goku_ep, ep);
 107         if (!_ep || !desc || ep->desc
 108                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 109                 return -EINVAL;
 110         dev = ep->dev;
 111         if (ep == &dev->ep[0])
 112                 return -EINVAL;
 113         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 114                 return -ESHUTDOWN;
 115         if (ep->num != (desc->bEndpointAddress & 0x0f))
 116                 return -EINVAL;
 117
 118         switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 119         case USB_ENDPOINT_XFER_BULK:
 120         case USB_ENDPOINT_XFER_INT:
 121                 break;
 122         default:
 123                 return -EINVAL;
 124         }
 125
 126         if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
 127                         != EPxSTATUS_EP_INVALID)
 128                 return -EBUSY;
 129
 130         /* enabling the no-toggle interrupt mode would need an api hook */
 131         mode = 0;
 132         max = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 133         switch (max) {
 134         case 64:        mode++;
 135         case 32:        mode++;
 136         case 16:        mode++;
 137         case 8:         mode <<= 3;
 138                         break;
 139         default:
 140                 return -EINVAL;
 141         }
 142         mode |= 2 << 1;         /* bulk, or intr-with-toggle */
 143
 144         /* ep1/ep2 dma direction is chosen early; it works in the other
 145          * direction, with pio.  be cautious with out-dma.
 146          */
 147         ep->is_in = (USB_DIR_IN & desc->bEndpointAddress) != 0;
 148         if (ep->is_in) {
 149                 mode |= 1;
 150                 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
 151         } else {
 152                 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
 153                 if (ep->dma)
 154                         DBG(dev, "%s out-dma hides short packets\n",
 155                                 ep->ep.name);
 156         }
 157
 158         spin_lock_irqsave(&ep->dev->lock, flags);
 159
 160         /* ep1 and ep2 can do double buffering and/or dma */
 161         if (ep->num < 3) {
 162                 struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 163                 u32                             tmp;
 164
 165                 /* double buffer except (for now) with pio in */
 166                 tmp = ((ep->dma || !ep->is_in)
 167                                 ? 0x10  /* double buffered */
 168                                 : 0x11  /* single buffer */
 169                         ) << ep->num;
 170                 tmp |= readl(&regs->EPxSingle);
 171                 writel(tmp, &regs->EPxSingle);
 172
 173                 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
 174                 tmp |= readl(&regs->EPxBCS);
 175                 writel(tmp, &regs->EPxBCS);
 176         }
 177         writel(mode, ep->reg_mode);
 178         command(ep->dev->regs, COMMAND_RESET, ep->num);
 179         ep->ep.maxpacket = max;
 180         ep->stopped = 0;
 181         ep->desc = desc;
 182         spin_unlock_irqrestore(&ep->dev->lock, flags);
 183
 184         DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
 185                 ep->is_in ? "IN" : "OUT",
 186                 ep->dma ? "dma" : "pio",
 187                 max);
 188
 189         return 0;
 190 }
 191
 192 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
 193 {
 194         struct goku_udc         *dev = ep->dev;
 195
 196         if (regs) {
 197                 command(regs, COMMAND_INVALID, ep->num);
 198                 if (ep->num) {
 199                         if (ep->num == UDC_MSTWR_ENDPOINT)
 200                                 dev->int_enable &= ~(INT_MSTWREND
 201                                                         |INT_MSTWRTMOUT);
 202                         else if (ep->num == UDC_MSTRD_ENDPOINT)
 203                                 dev->int_enable &= ~INT_MSTRDEND;
 204                         dev->int_enable &= ~INT_EPxDATASET (ep->num);
 205                 } else
 206                         dev->int_enable &= ~INT_EP0;
 207                 writel(dev->int_enable, &regs->int_enable);
 208                 readl(&regs->int_enable);
 209                 if (ep->num < 3) {
 210                         struct goku_udc_regs __iomem    *r = ep->dev->regs;
 211                         u32                             tmp;
 212
 213                         tmp = readl(&r->EPxSingle);
 214                         tmp &= ~(0x11 << ep->num);
 215                         writel(tmp, &r->EPxSingle);
 216
 217                         tmp = readl(&r->EPxBCS);
 218                         tmp &= ~(0x11 << ep->num);
 219                         writel(tmp, &r->EPxBCS);
 220                 }
 221                 /* reset dma in case we're still using it */
 222                 if (ep->dma) {
 223                         u32     master;
 224
 225                         master = readl(&regs->dma_master) & MST_RW_BITS;
 226                         if (ep->num == UDC_MSTWR_ENDPOINT) {
 227                                 master &= ~MST_W_BITS;
 228                                 master |= MST_WR_RESET;
 229                         } else {
 230                                 master &= ~MST_R_BITS;
 231                                 master |= MST_RD_RESET;
 232                         }
 233                         writel(master, &regs->dma_master);
 234                 }
 235         }
 236
 237         ep->ep.maxpacket = MAX_FIFO_SIZE;
 238         ep->desc = NULL;
 239         ep->stopped = 1;
 240         ep->irqs = 0;
 241         ep->dma = 0;
 242 }
 243
 244 static int goku_ep_disable(struct usb_ep *_ep)
 245 {
 246         struct goku_ep  *ep;
 247         struct goku_udc *dev;
 248         unsigned long   flags;
 249
 250         ep = container_of(_ep, struct goku_ep, ep);
 251         if (!_ep || !ep->desc)
 252                 return -ENODEV;
 253         dev = ep->dev;
 254         if (dev->ep0state == EP0_SUSPEND)
 255                 return -EBUSY;
 256
 257         VDBG(dev, "disable %s\n", _ep->name);
 258
 259         spin_lock_irqsave(&dev->lock, flags);
 260         nuke(ep, -ESHUTDOWN);
 261         ep_reset(dev->regs, ep);
 262         spin_unlock_irqrestore(&dev->lock, flags);
 263
 264         return 0;
 265 }
 266
 267 /*-------------------------------------------------------------------------*/
 268
 269 static struct usb_request *
 270 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 271 {
 272         struct goku_request     *req;
 273
 274         if (!_ep)
 275                 return NULL;
 276         req = kzalloc(sizeof *req, gfp_flags);
 277         if (!req)
 278                 return NULL;
 279
 280         req->req.dma = DMA_ADDR_INVALID;
 281         INIT_LIST_HEAD(&req->queue);
 282         return &req->req;
 283 }
 284
 285 static void
 286 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
 287 {
 288         struct goku_request     *req;
 289
 290         if (!_ep || !_req)
 291                 return;
 292
 293         req = container_of(_req, struct goku_request, req);
 294         WARN_ON(!list_empty(&req->queue));
 295         kfree(req);
 296 }
 297
 298 /*-------------------------------------------------------------------------*/
 299
 300 /* allocating buffers this way eliminates dma mapping overhead, which
 301  * on some platforms will mean eliminating a per-io buffer copy.  with
 302  * some kinds of system caches, further tweaks may still be needed.
 303  */
 304 static void *
 305 goku_alloc_buffer(struct usb_ep *_ep, unsigned bytes,
 306                         dma_addr_t *dma, gfp_t gfp_flags)
 307 {
 308         void            *retval;
 309         struct goku_ep  *ep;
 310
 311         ep = container_of(_ep, struct goku_ep, ep);
 312         if (!_ep)
 313                 return NULL;
 314         *dma = DMA_ADDR_INVALID;
 315
 316         if (ep->dma) {
 317                 /* the main problem with this call is that it wastes memory
 318                  * on typical 1/N page allocations: it allocates 1-N pages.
 319                  */
 320 #warning Using dma_alloc_coherent even with buffers smaller than a page.
 321                 retval = dma_alloc_coherent(&ep->dev->pdev->dev,
 322                                 bytes, dma, gfp_flags);
 323         } else
 324                 retval = kmalloc(bytes, gfp_flags);
 325         return retval;
 326 }
 327
 328 static void
 329 goku_free_buffer(struct usb_ep *_ep, void *buf, dma_addr_t dma, unsigned bytes)
 330 {
 331         /* free memory into the right allocator */
 332         if (dma != DMA_ADDR_INVALID) {
 333                 struct goku_ep  *ep;
 334
 335                 ep = container_of(_ep, struct goku_ep, ep);
 336                 if (!_ep)
 337                         return;
 338                 dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma);
 339         } else
 340                 kfree (buf);
 341 }
 342
 343 /*-------------------------------------------------------------------------*/
 344
 345 static void
 346 done(struct goku_ep *ep, struct goku_request *req, int status)
 347 {
 348         struct goku_udc         *dev;
 349         unsigned                stopped = ep->stopped;
 350
 351         list_del_init(&req->queue);
 352
 353         if (likely(req->req.status == -EINPROGRESS))
 354                 req->req.status = status;
 355         else
 356                 status = req->req.status;
 357
 358         dev = ep->dev;
 359         if (req->mapped) {
 360                 pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
 361                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 362                 req->req.dma = DMA_ADDR_INVALID;
 363                 req->mapped = 0;
 364         }
 365
 366 #ifndef USB_TRACE
 367         if (status && status != -ESHUTDOWN)
 368 #endif
 369                 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
 370                         ep->ep.name, &req->req, status,
 371                         req->req.actual, req->req.length);
 372
 373         /* don't modify queue heads during completion callback */
 374         ep->stopped = 1;
 375         spin_unlock(&dev->lock);
 376         req->req.complete(&ep->ep, &req->req);
 377         spin_lock(&dev->lock);
 378         ep->stopped = stopped;
 379 }
 380
 381 /*-------------------------------------------------------------------------*/
 382
 383 static inline int
 384 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
 385 {
 386         unsigned        length, count;
 387
 388         length = min(req->req.length - req->req.actual, max);
 389         req->req.actual += length;
 390
 391         count = length;
 392         while (likely(count--))
 393                 writel(*buf++, fifo);
 394         return length;
 395 }
 396
 397 // return:  0 = still running, 1 = completed, negative = errno
 398 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
 399 {
 400         struct goku_udc *dev = ep->dev;
 401         u32             tmp;
 402         u8              *buf;
 403         unsigned        count;
 404         int             is_last;
 405
 406         tmp = readl(&dev->regs->DataSet);
 407         buf = req->req.buf + req->req.actual;
 408         prefetch(buf);
 409
 410         dev = ep->dev;
 411         if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
 412                 return -EL2HLT;
 413
 414         /* NOTE:  just single-buffered PIO-IN for now.  */
 415         if (unlikely((tmp & DATASET_A(ep->num)) != 0))
 416                 return 0;
 417
 418         /* clear our "packet available" irq */
 419         if (ep->num != 0)
 420                 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
 421
 422         count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
 423
 424         /* last packet often short (sometimes a zlp, especially on ep0) */
 425         if (unlikely(count != ep->ep.maxpacket)) {
 426                 writel(~(1<<ep->num), &dev->regs->EOP);
 427                 if (ep->num == 0) {
 428                         dev->ep[0].stopped = 1;
 429                         dev->ep0state = EP0_STATUS;
 430                 }
 431                 is_last = 1;
 432         } else {
 433                 if (likely(req->req.length != req->req.actual)
 434                                 || req->req.zero)
 435                         is_last = 0;
 436                 else
 437                         is_last = 1;
 438         }
 439 #if 0           /* printk seemed to trash is_last...*/
 440 //#ifdef USB_TRACE
 441         VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
 442                 ep->ep.name, count, is_last ? "/last" : "",
 443                 req->req.length - req->req.actual, req);
 444 #endif
 445
 446         /* requests complete when all IN data is in the FIFO,
 447          * or sometimes later, if a zlp was needed.
 448          */
 449         if (is_last) {
 450                 done(ep, req, 0);
 451                 return 1;
 452         }
 453
 454         return 0;
 455 }
 456
 457 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
 458 {
 459         struct goku_udc_regs __iomem    *regs;
 460         u32                             size, set;
 461         u8                              *buf;
 462         unsigned                        bufferspace, is_short, dbuff;
 463
 464         regs = ep->dev->regs;
 465 top:
 466         buf = req->req.buf + req->req.actual;
 467         prefetchw(buf);
 468
 469         if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
 470                 return -EL2HLT;
 471
 472         dbuff = (ep->num == 1 || ep->num == 2);
 473         do {
 474                 /* ack dataset irq matching the status we'll handle */
 475                 if (ep->num != 0)
 476                         writel(~INT_EPxDATASET(ep->num), &regs->int_status);
 477
 478                 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
 479                 size = readl(&regs->EPxSizeLA[ep->num]);
 480                 bufferspace = req->req.length - req->req.actual;
 481
 482                 /* usually do nothing without an OUT packet */
 483                 if (likely(ep->num != 0 || bufferspace != 0)) {
 484                         if (unlikely(set == 0))
 485                                 break;
 486                         /* use ep1/ep2 double-buffering for OUT */
 487                         if (!(size & PACKET_ACTIVE))
 488                                 size = readl(&regs->EPxSizeLB[ep->num]);
 489                         if (!(size & PACKET_ACTIVE))    // "can't happen"
 490                                 break;
 491                         size &= DATASIZE;       /* EPxSizeH == 0 */
 492
 493                 /* ep0out no-out-data case for set_config, etc */
 494                 } else
 495                         size = 0;
 496
 497                 /* read all bytes from this packet */
 498                 req->req.actual += size;
 499                 is_short = (size < ep->ep.maxpacket);
 500 #ifdef USB_TRACE
 501                 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
 502                         ep->ep.name, size, is_short ? "/S" : "",
 503                         req, req->req.actual, req->req.length);
 504 #endif
 505                 while (likely(size-- != 0)) {
 506                         u8      byte = (u8) readl(ep->reg_fifo);
 507
 508                         if (unlikely(bufferspace == 0)) {
 509                                 /* this happens when the driver's buffer
 510                                  * is smaller than what the host sent.
 511                                  * discard the extra data in this packet.
 512                                  */
 513                                 if (req->req.status != -EOVERFLOW)
 514                                         DBG(ep->dev, "%s overflow %u\n",
 515                                                 ep->ep.name, size);
 516                                 req->req.status = -EOVERFLOW;
 517                         } else {
 518                                 *buf++ = byte;
 519                                 bufferspace--;
 520                         }
 521                 }
 522
 523                 /* completion */
 524                 if (unlikely(is_short || req->req.actual == req->req.length)) {
 525                         if (unlikely(ep->num == 0)) {
 526                                 /* non-control endpoints now usable? */
 527                                 if (ep->dev->req_config)
 528                                         writel(ep->dev->configured
 529                                                         ? USBSTATE_CONFIGURED
 530                                                         : 0,
 531                                                 &regs->UsbState);
 532                                 /* ep0out status stage */
 533                                 writel(~(1<<0), &regs->EOP);
 534                                 ep->stopped = 1;
 535                                 ep->dev->ep0state = EP0_STATUS;
 536                         }
 537                         done(ep, req, 0);
 538
 539                         /* empty the second buffer asap */
 540                         if (dbuff && !list_empty(&ep->queue)) {
 541                                 req = list_entry(ep->queue.next,
 542                                                 struct goku_request, queue);
 543                                 goto top;
 544                         }
 545                         return 1;
 546                 }
 547         } while (dbuff);
 548         return 0;
 549 }
 550
 551 static inline void
 552 pio_irq_enable(struct goku_udc *dev,
 553                 struct goku_udc_regs __iomem *regs, int epnum)
 554 {
 555         dev->int_enable |= INT_EPxDATASET (epnum);
 556         writel(dev->int_enable, &regs->int_enable);
 557         /* write may still be posted */
 558 }
 559
 560 static inline void
 561 pio_irq_disable(struct goku_udc *dev,
 562                 struct goku_udc_regs __iomem *regs, int epnum)
 563 {
 564         dev->int_enable &= ~INT_EPxDATASET (epnum);
 565         writel(dev->int_enable, &regs->int_enable);
 566         /* write may still be posted */
 567 }
 568
 569 static inline void
 570 pio_advance(struct goku_ep *ep)
 571 {
 572         struct goku_request     *req;
 573
 574         if (unlikely(list_empty (&ep->queue)))
 575                 return;
 576         req = list_entry(ep->queue.next, struct goku_request, queue);
 577         (ep->is_in ? write_fifo : read_fifo)(ep, req);
 578 }
 579
 580
 581 /*-------------------------------------------------------------------------*/
 582
 583 // return:  0 = q running, 1 = q stopped, negative = errno
 584 static int start_dma(struct goku_ep *ep, struct goku_request *req)
 585 {
 586         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 587         u32                             master;
 588         u32                             start = req->req.dma;
 589         u32                             end = start + req->req.length - 1;
 590
 591         master = readl(&regs->dma_master) & MST_RW_BITS;
 592
 593         /* re-init the bits affecting IN dma; careful with zlps */
 594         if (likely(ep->is_in)) {
 595                 if (unlikely(master & MST_RD_ENA)) {
 596                         DBG (ep->dev, "start, IN active dma %03x!!\n",
 597                                 master);
 598 //                      return -EL2HLT;
 599                 }
 600                 writel(end, &regs->in_dma_end);
 601                 writel(start, &regs->in_dma_start);
 602
 603                 master &= ~MST_R_BITS;
 604                 if (unlikely(req->req.length == 0))
 605                         master = MST_RD_ENA | MST_RD_EOPB;
 606                 else if ((req->req.length % ep->ep.maxpacket) != 0
 607                                         || req->req.zero)
 608                         master = MST_RD_ENA | MST_EOPB_ENA;
 609                 else
 610                         master = MST_RD_ENA | MST_EOPB_DIS;
 611
 612                 ep->dev->int_enable |= INT_MSTRDEND;
 613
 614         /* Goku DMA-OUT merges short packets, which plays poorly with
 615          * protocols where short packets mark the transfer boundaries.
 616          * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
 617          * ending transfers after 3 SOFs; we don't turn it on.
 618          */
 619         } else {
 620                 if (unlikely(master & MST_WR_ENA)) {
 621                         DBG (ep->dev, "start, OUT active dma %03x!!\n",
 622                                 master);
 623 //                      return -EL2HLT;
 624                 }
 625                 writel(end, &regs->out_dma_end);
 626                 writel(start, &regs->out_dma_start);
 627
 628                 master &= ~MST_W_BITS;
 629                 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
 630
 631                 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
 632         }
 633
 634         writel(master, &regs->dma_master);
 635         writel(ep->dev->int_enable, &regs->int_enable);
 636         return 0;
 637 }
 638
 639 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
 640 {
 641         struct goku_request             *req;
 642         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 643         u32                             master;
 644
 645         master = readl(&regs->dma_master);
 646
 647         if (unlikely(list_empty(&ep->queue))) {
 648 stop:
 649                 if (ep->is_in)
 650                         dev->int_enable &= ~INT_MSTRDEND;
 651                 else
 652                         dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
 653                 writel(dev->int_enable, &regs->int_enable);
 654                 return;
 655         }
 656         req = list_entry(ep->queue.next, struct goku_request, queue);
 657
 658         /* normal hw dma completion (not abort) */
 659         if (likely(ep->is_in)) {
 660                 if (unlikely(master & MST_RD_ENA))
 661                         return;
 662                 req->req.actual = readl(&regs->in_dma_current);
 663         } else {
 664                 if (unlikely(master & MST_WR_ENA))
 665                         return;
 666
 667                 /* hardware merges short packets, and also hides packet
 668                  * overruns.  a partial packet MAY be in the fifo here.
 669                  */
 670                 req->req.actual = readl(&regs->out_dma_current);
 671         }
 672         req->req.actual -= req->req.dma;
 673         req->req.actual++;
 674
 675 #ifdef USB_TRACE
 676         VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
 677                 ep->ep.name, ep->is_in ? "IN" : "OUT",
 678                 req->req.actual, req->req.length, req);
 679 #endif
 680         done(ep, req, 0);
 681         if (list_empty(&ep->queue))
 682                 goto stop;
 683         req = list_entry(ep->queue.next, struct goku_request, queue);
 684         (void) start_dma(ep, req);
 685 }
 686
 687 static void abort_dma(struct goku_ep *ep, int status)
 688 {
 689         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 690         struct goku_request             *req;
 691         u32                             curr, master;
 692
 693         /* NAK future host requests, hoping the implicit delay lets the
 694          * dma engine finish reading (or writing) its latest packet and
 695          * empty the dma buffer (up to 16 bytes).
 696          *
 697          * This avoids needing to clean up a partial packet in the fifo;
 698          * we can't do that for IN without side effects to HALT and TOGGLE.
 699          */
 700         command(regs, COMMAND_FIFO_DISABLE, ep->num);
 701         req = list_entry(ep->queue.next, struct goku_request, queue);
 702         master = readl(&regs->dma_master) & MST_RW_BITS;
 703
 704         /* FIXME using these resets isn't usably documented. this may
 705          * not work unless it's followed by disabling the endpoint.
 706          *
 707          * FIXME the OUT reset path doesn't even behave consistently.
 708          */
 709         if (ep->is_in) {
 710                 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
 711                         goto finished;
 712                 curr = readl(&regs->in_dma_current);
 713
 714                 writel(curr, &regs->in_dma_end);
 715                 writel(curr, &regs->in_dma_start);
 716
 717                 master &= ~MST_R_BITS;
 718                 master |= MST_RD_RESET;
 719                 writel(master, &regs->dma_master);
 720
 721                 if (readl(&regs->dma_master) & MST_RD_ENA)
 722                         DBG(ep->dev, "IN dma active after reset!\n");
 723
 724         } else {
 725                 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
 726                         goto finished;
 727                 curr = readl(&regs->out_dma_current);
 728
 729                 writel(curr, &regs->out_dma_end);
 730                 writel(curr, &regs->out_dma_start);
 731
 732                 master &= ~MST_W_BITS;
 733                 master |= MST_WR_RESET;
 734                 writel(master, &regs->dma_master);
 735
 736                 if (readl(&regs->dma_master) & MST_WR_ENA)
 737                         DBG(ep->dev, "OUT dma active after reset!\n");
 738         }
 739         req->req.actual = (curr - req->req.dma) + 1;
 740         req->req.status = status;
 741
 742         VDBG(ep->dev, "%s %s %s %d/%d\n", __FUNCTION__, ep->ep.name,
 743                 ep->is_in ? "IN" : "OUT",
 744                 req->req.actual, req->req.length);
 745
 746         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 747
 748         return;
 749
 750 finished:
 751         /* dma already completed; no abort needed */
 752         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 753         req->req.actual = req->req.length;
 754         req->req.status = 0;
 755 }
 756
 757 /*-------------------------------------------------------------------------*/
 758
 759 static int
 760 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 761 {
 762         struct goku_request     *req;
 763         struct goku_ep          *ep;
 764         struct goku_udc         *dev;
 765         unsigned long           flags;
 766         int                     status;
 767
 768         /* always require a cpu-view buffer so pio works */
 769         req = container_of(_req, struct goku_request, req);
 770         if (unlikely(!_req || !_req->complete
 771                         || !_req->buf || !list_empty(&req->queue)))
 772                 return -EINVAL;
 773         ep = container_of(_ep, struct goku_ep, ep);
 774         if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
 775                 return -EINVAL;
 776         dev = ep->dev;
 777         if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
 778                 return -ESHUTDOWN;
 779
 780         /* can't touch registers when suspended */
 781         if (dev->ep0state == EP0_SUSPEND)
 782                 return -EBUSY;
 783
 784         /* set up dma mapping in case the caller didn't */
 785         if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
 786                 _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
 787                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 788                 req->mapped = 1;
 789         }
 790
 791 #ifdef USB_TRACE
 792         VDBG(dev, "%s queue req %p, len %u buf %p\n",
 793                         _ep->name, _req, _req->length, _req->buf);
 794 #endif
 795
 796         spin_lock_irqsave(&dev->lock, flags);
 797
 798         _req->status = -EINPROGRESS;
 799         _req->actual = 0;
 800
 801         /* for ep0 IN without premature status, zlp is required and
 802          * writing EOP starts the status stage (OUT).
 803          */
 804         if (unlikely(ep->num == 0 && ep->is_in))
 805                 _req->zero = 1;
 806
 807         /* kickstart this i/o queue? */
 808         status = 0;
 809         if (list_empty(&ep->queue) && likely(!ep->stopped)) {
 810                 /* dma:  done after dma completion IRQ (or error)
 811                  * pio:  done after last fifo operation
 812                  */
 813                 if (ep->dma)
 814                         status = start_dma(ep, req);
 815                 else
 816                         status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
 817
 818                 if (unlikely(status != 0)) {
 819                         if (status > 0)
 820                                 status = 0;
 821                         req = NULL;
 822                 }
 823
 824         } /* else pio or dma irq handler advances the queue. */
 825
 826         if (likely(req != 0))
 827                 list_add_tail(&req->queue, &ep->queue);
 828
 829         if (likely(!list_empty(&ep->queue))
 830                         && likely(ep->num != 0)
 831                         && !ep->dma
 832                         && !(dev->int_enable & INT_EPxDATASET (ep->num)))
 833                 pio_irq_enable(dev, dev->regs, ep->num);
 834
 835         spin_unlock_irqrestore(&dev->lock, flags);
 836
 837         /* pci writes may still be posted */
 838         return status;
 839 }
 840
 841 /* dequeue ALL requests */
 842 static void nuke(struct goku_ep *ep, int status)
 843 {
 844         struct goku_request     *req;
 845
 846         ep->stopped = 1;
 847         if (list_empty(&ep->queue))
 848                 return;
 849         if (ep->dma)
 850                 abort_dma(ep, status);
 851         while (!list_empty(&ep->queue)) {
 852                 req = list_entry(ep->queue.next, struct goku_request, queue);
 853                 done(ep, req, status);
 854         }
 855 }
 856
 857 /* dequeue JUST ONE request */
 858 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 859 {
 860         struct goku_request     *req;
 861         struct goku_ep          *ep;
 862         struct goku_udc         *dev;
 863         unsigned long           flags;
 864
 865         ep = container_of(_ep, struct goku_ep, ep);
 866         if (!_ep || !_req || (!ep->desc && ep->num != 0))
 867                 return -EINVAL;
 868         dev = ep->dev;
 869         if (!dev->driver)
 870                 return -ESHUTDOWN;
 871
 872         /* we can't touch (dma) registers when suspended */
 873         if (dev->ep0state == EP0_SUSPEND)
 874                 return -EBUSY;
 875
 876         VDBG(dev, "%s %s %s %s %p\n", __FUNCTION__, _ep->name,
 877                 ep->is_in ? "IN" : "OUT",
 878                 ep->dma ? "dma" : "pio",
 879                 _req);
 880
 881         spin_lock_irqsave(&dev->lock, flags);
 882
 883         /* make sure it's actually queued on this endpoint */
 884         list_for_each_entry (req, &ep->queue, queue) {
 885                 if (&req->req == _req)
 886                         break;
 887         }
 888         if (&req->req != _req) {
 889                 spin_unlock_irqrestore (&dev->lock, flags);
 890                 return -EINVAL;
 891         }
 892
 893         if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
 894                 abort_dma(ep, -ECONNRESET);
 895                 done(ep, req, -ECONNRESET);
 896                 dma_advance(dev, ep);
 897         } else if (!list_empty(&req->queue))
 898                 done(ep, req, -ECONNRESET);
 899         else
 900                 req = NULL;
 901         spin_unlock_irqrestore(&dev->lock, flags);
 902
 903         return req ? 0 : -EOPNOTSUPP;
 904 }
 905
 906 /*-------------------------------------------------------------------------*/
 907
 908 static void goku_clear_halt(struct goku_ep *ep)
 909 {
 910         // assert (ep->num !=0)
 911         VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
 912         command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
 913         command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
 914         if (ep->stopped) {
 915                 ep->stopped = 0;
 916                 if (ep->dma) {
 917                         struct goku_request     *req;
 918
 919                         if (list_empty(&ep->queue))
 920                                 return;
 921                         req = list_entry(ep->queue.next, struct goku_request,
 922                                                 queue);
 923                         (void) start_dma(ep, req);
 924                 } else
 925                         pio_advance(ep);
 926         }
 927 }
 928
 929 static int goku_set_halt(struct usb_ep *_ep, int value)
 930 {
 931         struct goku_ep  *ep;
 932         unsigned long   flags;
 933         int             retval = 0;
 934
 935         if (!_ep)
 936                 return -ENODEV;
 937         ep = container_of (_ep, struct goku_ep, ep);
 938
 939         if (ep->num == 0) {
 940                 if (value) {
 941                         ep->dev->ep0state = EP0_STALL;
 942                         ep->dev->ep[0].stopped = 1;
 943                 } else
 944                         return -EINVAL;
 945
 946         /* don't change EPxSTATUS_EP_INVALID to READY */
 947         } else if (!ep->desc) {
 948                 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
 949                 return -EINVAL;
 950         }
 951
 952         spin_lock_irqsave(&ep->dev->lock, flags);
 953         if (!list_empty(&ep->queue))
 954                 retval = -EAGAIN;
 955         else if (ep->is_in && value
 956                         /* data in (either) packet buffer? */
 957                         && (readl(&ep->dev->regs->DataSet)
 958                                         & DATASET_AB(ep->num)))
 959                 retval = -EAGAIN;
 960         else if (!value)
 961                 goku_clear_halt(ep);
 962         else {
 963                 ep->stopped = 1;
 964                 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
 965                 command(ep->dev->regs, COMMAND_STALL, ep->num);
 966                 readl(ep->reg_status);
 967         }
 968         spin_unlock_irqrestore(&ep->dev->lock, flags);
 969         return retval;
 970 }
 971
 972 static int goku_fifo_status(struct usb_ep *_ep)
 973 {
 974         struct goku_ep                  *ep;
 975         struct goku_udc_regs __iomem    *regs;
 976         u32                             size;
 977
 978         if (!_ep)
 979                 return -ENODEV;
 980         ep = container_of(_ep, struct goku_ep, ep);
 981
 982         /* size is only reported sanely for OUT */
 983         if (ep->is_in)
 984                 return -EOPNOTSUPP;
 985
 986         /* ignores 16-byte dma buffer; SizeH == 0 */
 987         regs = ep->dev->regs;
 988         size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
 989         size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
 990         VDBG(ep->dev, "%s %s %u\n", __FUNCTION__, ep->ep.name, size);
 991         return size;
 992 }
 993
 994 static void goku_fifo_flush(struct usb_ep *_ep)
 995 {
 996         struct goku_ep                  *ep;
 997         struct goku_udc_regs __iomem    *regs;
 998         u32                             size;
 999
1000         if (!_ep)
1001                 return;
1002         ep = container_of(_ep, struct goku_ep, ep);
1003         VDBG(ep->dev, "%s %s\n", __FUNCTION__, ep->ep.name);
1004
1005         /* don't change EPxSTATUS_EP_INVALID to READY */
1006         if (!ep->desc && ep->num != 0) {
1007                 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
1008                 return;
1009         }
1010
1011         regs = ep->dev->regs;
1012         size = readl(&regs->EPxSizeLA[ep->num]);
1013         size &= DATASIZE;
1014
1015         /* Non-desirable behavior:  FIFO_CLEAR also clears the
1016          * endpoint halt feature.  For OUT, we _could_ just read
1017          * the bytes out (PIO, if !ep->dma); for in, no choice.
1018          */
1019         if (size)
1020                 command(regs, COMMAND_FIFO_CLEAR, ep->num);
1021 }
1022
1023 static struct usb_ep_ops goku_ep_ops = {
1024         .enable         = goku_ep_enable,
1025         .disable        = goku_ep_disable,
1026
1027         .alloc_request  = goku_alloc_request,
1028         .free_request   = goku_free_request,
1029
1030         .alloc_buffer   = goku_alloc_buffer,
1031         .free_buffer    = goku_free_buffer,
1032
1033         .queue          = goku_queue,
1034         .dequeue        = goku_dequeue,
1035
1036         .set_halt       = goku_set_halt,
1037         .fifo_status    = goku_fifo_status,
1038         .fifo_flush     = goku_fifo_flush,
1039 };
1040
1041 /*-------------------------------------------------------------------------*/
1042
1043 static int goku_get_frame(struct usb_gadget *_gadget)
1044 {
1045         return -EOPNOTSUPP;
1046 }
1047
1048 static const struct usb_gadget_ops goku_ops = {
1049         .get_frame      = goku_get_frame,
1050         // no remote wakeup
1051         // not selfpowered
1052 };
1053
1054 /*-------------------------------------------------------------------------*/
1055
1056 static inline char *dmastr(void)
1057 {
1058         if (use_dma == 0)
1059                 return "(dma disabled)";
1060         else if (use_dma == 2)
1061                 return "(dma IN and OUT)";
1062         else
1063                 return "(dma IN)";
1064 }
1065
1066 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1067
1068 static const char proc_node_name [] = "driver/udc";
1069
1070 #define FOURBITS "%s%s%s%s"
1071 #define EIGHTBITS FOURBITS FOURBITS
1072
1073 static void
1074 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1075 {
1076         int t;
1077
1078         /* int_status is the same format ... */
1079         t = scnprintf(*next, *size,
1080                 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1081                 label, mask,
1082                 (mask & INT_PWRDETECT) ? " power" : "",
1083                 (mask & INT_SYSERROR) ? " sys" : "",
1084                 (mask & INT_MSTRDEND) ? " in-dma" : "",
1085                 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1086
1087                 (mask & INT_MSTWREND) ? " out-dma" : "",
1088                 (mask & INT_MSTWRSET) ? " wrset" : "",
1089                 (mask & INT_ERR) ? " err" : "",
1090                 (mask & INT_SOF) ? " sof" : "",
1091
1092                 (mask & INT_EP3NAK) ? " ep3nak" : "",
1093                 (mask & INT_EP2NAK) ? " ep2nak" : "",
1094                 (mask & INT_EP1NAK) ? " ep1nak" : "",
1095                 (mask & INT_EP3DATASET) ? " ep3" : "",
1096
1097                 (mask & INT_EP2DATASET) ? " ep2" : "",
1098                 (mask & INT_EP1DATASET) ? " ep1" : "",
1099                 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1100                 (mask & INT_STATUS) ? " ep0status" : "",
1101
1102                 (mask & INT_SETUP) ? " setup" : "",
1103                 (mask & INT_ENDPOINT0) ? " ep0" : "",
1104                 (mask & INT_USBRESET) ? " reset" : "",
1105                 (mask & INT_SUSPEND) ? " suspend" : "");
1106         *size -= t;
1107         *next += t;
1108 }
1109
1110
1111 static int
1112 udc_proc_read(char *buffer, char **start, off_t off, int count,
1113                 int *eof, void *_dev)
1114 {
1115         char                            *buf = buffer;
1116         struct goku_udc                 *dev = _dev;
1117         struct goku_udc_regs __iomem    *regs = dev->regs;
1118         char                            *next = buf;
1119         unsigned                        size = count;
1120         unsigned long                   flags;
1121         int                             i, t, is_usb_connected;
1122         u32                             tmp;
1123
1124         if (off != 0)
1125                 return 0;
1126
1127         local_irq_save(flags);
1128
1129         /* basic device status */
1130         tmp = readl(&regs->power_detect);
1131         is_usb_connected = tmp & PW_DETECT;
1132         t = scnprintf(next, size,
1133                 "%s - %s\n"
1134                 "%s version: %s %s\n"
1135                 "Gadget driver: %s\n"
1136                 "Host %s, %s\n"
1137                 "\n",
1138                 pci_name(dev->pdev), driver_desc,
1139                 driver_name, DRIVER_VERSION, dmastr(),
1140                 dev->driver ? dev->driver->driver.name : "(none)",
1141                 is_usb_connected
1142                         ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1143                         : "disconnected",
1144                 ({char *tmp;
1145                 switch(dev->ep0state){
1146                 case EP0_DISCONNECT:    tmp = "ep0_disconnect"; break;
1147                 case EP0_IDLE:          tmp = "ep0_idle"; break;
1148                 case EP0_IN:            tmp = "ep0_in"; break;
1149                 case EP0_OUT:           tmp = "ep0_out"; break;
1150                 case EP0_STATUS:        tmp = "ep0_status"; break;
1151                 case EP0_STALL:         tmp = "ep0_stall"; break;
1152                 case EP0_SUSPEND:       tmp = "ep0_suspend"; break;
1153                 default:                tmp = "ep0_?"; break;
1154                 } tmp; })
1155                 );
1156         size -= t;
1157         next += t;
1158
1159         dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1160         dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1161
1162         if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1163                 goto done;
1164
1165         /* registers for (active) device and ep0 */
1166         t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1167                         "single.bcs %02x.%02x state %x addr %u\n",
1168                         dev->irqs, readl(&regs->DataSet),
1169                         readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1170                         readl(&regs->UsbState),
1171                         readl(&regs->address));
1172         size -= t;
1173         next += t;
1174
1175         tmp = readl(&regs->dma_master);
1176         t = scnprintf(next, size,
1177                 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1178                 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1179                 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1180                 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1181                 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1182
1183                 (tmp & MST_RD_EOPB) ? " eopb" : "",
1184                 (tmp & MST_RD_RESET) ? " in_reset" : "",
1185                 (tmp & MST_WR_RESET) ? " out_reset" : "",
1186                 (tmp & MST_RD_ENA) ? " IN" : "",
1187
1188                 (tmp & MST_WR_ENA) ? " OUT" : "",
1189                 (tmp & MST_CONNECTION)
1190                         ? "ep1in/ep2out"
1191                         : "ep1out/ep2in");
1192         size -= t;
1193         next += t;
1194
1195         /* dump endpoint queues */
1196         for (i = 0; i < 4; i++) {
1197                 struct goku_ep          *ep = &dev->ep [i];
1198                 struct goku_request     *req;
1199                 int                     t;
1200
1201                 if (i && !ep->desc)
1202                         continue;
1203
1204                 tmp = readl(ep->reg_status);
1205                 t = scnprintf(next, size,
1206                         "%s %s max %u %s, irqs %lu, "
1207                         "status %02x (%s) " FOURBITS "\n",
1208                         ep->ep.name,
1209                         ep->is_in ? "in" : "out",
1210                         ep->ep.maxpacket,
1211                         ep->dma ? "dma" : "pio",
1212                         ep->irqs,
1213                         tmp, ({ char *s;
1214                         switch (tmp & EPxSTATUS_EP_MASK) {
1215                         case EPxSTATUS_EP_READY:
1216                                 s = "ready"; break;
1217                         case EPxSTATUS_EP_DATAIN:
1218                                 s = "packet"; break;
1219                         case EPxSTATUS_EP_FULL:
1220                                 s = "full"; break;
1221                         case EPxSTATUS_EP_TX_ERR:       // host will retry
1222                                 s = "tx_err"; break;
1223                         case EPxSTATUS_EP_RX_ERR:
1224                                 s = "rx_err"; break;
1225                         case EPxSTATUS_EP_BUSY:         /* ep0 only */
1226                                 s = "busy"; break;
1227                         case EPxSTATUS_EP_STALL:
1228                                 s = "stall"; break;
1229                         case EPxSTATUS_EP_INVALID:      // these "can't happen"
1230                                 s = "invalid"; break;
1231                         default:
1232                                 s = "?"; break;
1233                         }; s; }),
1234                         (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1235                         (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1236                         (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1237                         (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1238                         );
1239                 if (t <= 0 || t > size)
1240                         goto done;
1241                 size -= t;
1242                 next += t;
1243
1244                 if (list_empty(&ep->queue)) {
1245                         t = scnprintf(next, size, "\t(nothing queued)\n");
1246                         if (t <= 0 || t > size)
1247                                 goto done;
1248                         size -= t;
1249                         next += t;
1250                         continue;
1251                 }
1252                 list_for_each_entry(req, &ep->queue, queue) {
1253                         if (ep->dma && req->queue.prev == &ep->queue) {
1254                                 if (i == UDC_MSTRD_ENDPOINT)
1255                                         tmp = readl(&regs->in_dma_current);
1256                                 else
1257                                         tmp = readl(&regs->out_dma_current);
1258                                 tmp -= req->req.dma;
1259                                 tmp++;
1260                         } else
1261                                 tmp = req->req.actual;
1262
1263                         t = scnprintf(next, size,
1264                                 "\treq %p len %u/%u buf %p\n",
1265                                 &req->req, tmp, req->req.length,
1266                                 req->req.buf);
1267                         if (t <= 0 || t > size)
1268                                 goto done;
1269                         size -= t;
1270                         next += t;
1271                 }
1272         }
1273
1274 done:
1275         local_irq_restore(flags);
1276         *eof = 1;
1277         return count - size;
1278 }
1279
1280 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1281
1282 /*-------------------------------------------------------------------------*/
1283
1284 static void udc_reinit (struct goku_udc *dev)
1285 {
1286         static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1287
1288         unsigned i;
1289
1290         INIT_LIST_HEAD (&dev->gadget.ep_list);
1291         dev->gadget.ep0 = &dev->ep [0].ep;
1292         dev->gadget.speed = USB_SPEED_UNKNOWN;
1293         dev->ep0state = EP0_DISCONNECT;
1294         dev->irqs = 0;
1295
1296         for (i = 0; i < 4; i++) {
1297                 struct goku_ep  *ep = &dev->ep[i];
1298
1299                 ep->num = i;
1300                 ep->ep.name = names[i];
1301                 ep->reg_fifo = &dev->regs->ep_fifo [i];
1302                 ep->reg_status = &dev->regs->ep_status [i];
1303                 ep->reg_mode = &dev->regs->ep_mode[i];
1304
1305                 ep->ep.ops = &goku_ep_ops;
1306                 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1307                 ep->dev = dev;
1308                 INIT_LIST_HEAD (&ep->queue);
1309
1310                 ep_reset(NULL, ep);
1311         }
1312
1313         dev->ep[0].reg_mode = NULL;
1314         dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1315         list_del_init (&dev->ep[0].ep.ep_list);
1316 }
1317
1318 static void udc_reset(struct goku_udc *dev)
1319 {
1320         struct goku_udc_regs __iomem    *regs = dev->regs;
1321
1322         writel(0, &regs->power_detect);
1323         writel(0, &regs->int_enable);
1324         readl(&regs->int_enable);
1325         dev->int_enable = 0;
1326
1327         /* deassert reset, leave USB D+ at hi-Z (no pullup)
1328          * don't let INT_PWRDETECT sequence begin
1329          */
1330         udelay(250);
1331         writel(PW_RESETB, &regs->power_detect);
1332         readl(&regs->int_enable);
1333 }
1334
1335 static void ep0_start(struct goku_udc *dev)
1336 {
1337         struct goku_udc_regs __iomem    *regs = dev->regs;
1338         unsigned                        i;
1339
1340         VDBG(dev, "%s\n", __FUNCTION__);
1341
1342         udc_reset(dev);
1343         udc_reinit (dev);
1344         //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1345
1346         /* hw handles set_address, set_feature, get_status; maybe more */
1347         writel(   G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1348                 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1349                 | G_REQMODE_GET_DESC
1350                 | G_REQMODE_CLEAR_FEAT
1351                 , &regs->reqmode);
1352
1353         for (i = 0; i < 4; i++)
1354                 dev->ep[i].irqs = 0;
1355
1356         /* can't modify descriptors after writing UsbReady */
1357         for (i = 0; i < DESC_LEN; i++)
1358                 writel(0, &regs->descriptors[i]);
1359         writel(0, &regs->UsbReady);
1360
1361         /* expect ep0 requests when the host drops reset */
1362         writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1363         dev->int_enable = INT_DEVWIDE | INT_EP0;
1364         writel(dev->int_enable, &dev->regs->int_enable);
1365         readl(&regs->int_enable);
1366         dev->gadget.speed = USB_SPEED_FULL;
1367         dev->ep0state = EP0_IDLE;
1368 }
1369
1370 static void udc_enable(struct goku_udc *dev)
1371 {
1372         /* start enumeration now, or after power detect irq */
1373         if (readl(&dev->regs->power_detect) & PW_DETECT)
1374                 ep0_start(dev);
1375         else {
1376                 DBG(dev, "%s\n", __FUNCTION__);
1377                 dev->int_enable = INT_PWRDETECT;
1378                 writel(dev->int_enable, &dev->regs->int_enable);
1379         }
1380 }
1381
1382 /*-------------------------------------------------------------------------*/
1383
1384 /* keeping it simple:
1385  * - one bus driver, initted first;
1386  * - one function driver, initted second
1387  */
1388
1389 static struct goku_udc  *the_controller;
1390
1391 /* when a driver is successfully registered, it will receive
1392  * control requests including set_configuration(), which enables
1393  * non-control requests.  then usb traffic follows until a
1394  * disconnect is reported.  then a host may connect again, or
1395  * the driver might get unbound.
1396  */
1397 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1398 {
1399         struct goku_udc *dev = the_controller;
1400         int                     retval;
1401
1402         if (!driver
1403                         || driver->speed != USB_SPEED_FULL
1404                         || !driver->bind
1405                         || !driver->disconnect
1406                         || !driver->setup)
1407                 return -EINVAL;
1408         if (!dev)
1409                 return -ENODEV;
1410         if (dev->driver)
1411                 return -EBUSY;
1412
1413         /* hook up the driver */
1414         driver->driver.bus = NULL;
1415         dev->driver = driver;
1416         dev->gadget.dev.driver = &driver->driver;
1417         retval = driver->bind(&dev->gadget);
1418         if (retval) {
1419                 DBG(dev, "bind to driver %s --> error %d\n",
1420                                 driver->driver.name, retval);
1421                 dev->driver = NULL;
1422                 dev->gadget.dev.driver = NULL;
1423                 return retval;
1424         }
1425
1426         /* then enable host detection and ep0; and we're ready
1427          * for set_configuration as well as eventual disconnect.
1428          */
1429         udc_enable(dev);
1430
1431         DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1432         return 0;
1433 }
1434 EXPORT_SYMBOL(usb_gadget_register_driver);
1435
1436 static void
1437 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1438 {
1439         unsigned        i;
1440
1441         DBG (dev, "%s\n", __FUNCTION__);
1442
1443         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1444                 driver = NULL;
1445
1446         /* disconnect gadget driver after quiesceing hw and the driver */
1447         udc_reset (dev);
1448         for (i = 0; i < 4; i++)
1449                 nuke(&dev->ep [i], -ESHUTDOWN);
1450         if (driver) {
1451                 spin_unlock(&dev->lock);
1452                 driver->disconnect(&dev->gadget);
1453                 spin_lock(&dev->lock);
1454         }
1455
1456         if (dev->driver)
1457                 udc_enable(dev);
1458 }
1459
1460 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1461 {
1462         struct goku_udc *dev = the_controller;
1463         unsigned long   flags;
1464
1465         if (!dev)
1466                 return -ENODEV;
1467         if (!driver || driver != dev->driver || !driver->unbind)
1468                 return -EINVAL;
1469
1470         spin_lock_irqsave(&dev->lock, flags);
1471         dev->driver = NULL;
1472         stop_activity(dev, driver);
1473         spin_unlock_irqrestore(&dev->lock, flags);
1474
1475         driver->unbind(&dev->gadget);
1476
1477         DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1478         return 0;
1479 }
1480 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1481
1482
1483 /*-------------------------------------------------------------------------*/
1484
1485 static void ep0_setup(struct goku_udc *dev)
1486 {
1487         struct goku_udc_regs __iomem    *regs = dev->regs;
1488         struct usb_ctrlrequest          ctrl;
1489         int                             tmp;
1490
1491         /* read SETUP packet and enter DATA stage */
1492         ctrl.bRequestType = readl(&regs->bRequestType);
1493         ctrl.bRequest = readl(&regs->bRequest);
1494         ctrl.wValue  = cpu_to_le16((readl(&regs->wValueH)  << 8)
1495                                         | readl(&regs->wValueL));
1496         ctrl.wIndex  = cpu_to_le16((readl(&regs->wIndexH)  << 8)
1497                                         | readl(&regs->wIndexL));
1498         ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1499                                         | readl(&regs->wLengthL));
1500         writel(0, &regs->SetupRecv);
1501
1502         nuke(&dev->ep[0], 0);
1503         dev->ep[0].stopped = 0;
1504         if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1505                 dev->ep[0].is_in = 1;
1506                 dev->ep0state = EP0_IN;
1507                 /* detect early status stages */
1508                 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1509         } else {
1510                 dev->ep[0].is_in = 0;
1511                 dev->ep0state = EP0_OUT;
1512
1513                 /* NOTE:  CLEAR_FEATURE is done in software so that we can
1514                  * synchronize transfer restarts after bulk IN stalls.  data
1515                  * won't even enter the fifo until the halt is cleared.
1516                  */
1517                 switch (ctrl.bRequest) {
1518                 case USB_REQ_CLEAR_FEATURE:
1519                         switch (ctrl.bRequestType) {
1520                         case USB_RECIP_ENDPOINT:
1521                                 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1522                                 /* active endpoint */
1523                                 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1524                                         goto stall;
1525                                 if (ctrl.wIndex & __constant_cpu_to_le16(
1526                                                 USB_DIR_IN)) {
1527                                         if (!dev->ep[tmp].is_in)
1528                                                 goto stall;
1529                                 } else {
1530                                         if (dev->ep[tmp].is_in)
1531                                                 goto stall;
1532                                 }
1533                                 if (ctrl.wValue != __constant_cpu_to_le16(
1534                                                 USB_ENDPOINT_HALT))
1535                                         goto stall;
1536                                 if (tmp)
1537                                         goku_clear_halt(&dev->ep[tmp]);
1538 succeed:
1539                                 /* start ep0out status stage */
1540                                 writel(~(1<<0), &regs->EOP);
1541                                 dev->ep[0].stopped = 1;
1542                                 dev->ep0state = EP0_STATUS;
1543                                 return;
1544                         case USB_RECIP_DEVICE:
1545                                 /* device remote wakeup: always clear */
1546                                 if (ctrl.wValue != __constant_cpu_to_le16(1))
1547                                         goto stall;
1548                                 VDBG(dev, "clear dev remote wakeup\n");
1549                                 goto succeed;
1550                         case USB_RECIP_INTERFACE:
1551                                 goto stall;
1552                         default:                /* pass to gadget driver */
1553                                 break;
1554                         }
1555                         break;
1556                 default:
1557                         break;
1558                 }
1559         }
1560
1561 #ifdef USB_TRACE
1562         VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1563                 ctrl.bRequestType, ctrl.bRequest,
1564                 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1565                 le16_to_cpu(ctrl.wLength));
1566 #endif
1567
1568         /* hw wants to know when we're configured (or not) */
1569         dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1570                                 && ctrl.bRequestType == USB_RECIP_DEVICE);
1571         if (unlikely(dev->req_config))
1572                 dev->configured = (ctrl.wValue != __constant_cpu_to_le16(0));
1573
1574         /* delegate everything to the gadget driver.
1575          * it may respond after this irq handler returns.
1576          */
1577         spin_unlock (&dev->lock);
1578         tmp = dev->driver->setup(&dev->gadget, &ctrl);
1579         spin_lock (&dev->lock);
1580         if (unlikely(tmp < 0)) {
1581 stall:
1582 #ifdef USB_TRACE
1583                 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1584                                 ctrl.bRequestType, ctrl.bRequest, tmp);
1585 #endif
1586                 command(regs, COMMAND_STALL, 0);
1587                 dev->ep[0].stopped = 1;
1588                 dev->ep0state = EP0_STALL;
1589         }
1590
1591         /* expect at least one data or status stage irq */
1592 }
1593
1594 #define ACK(irqbit) { \
1595                 stat &= ~irqbit; \
1596                 writel(~irqbit, &regs->int_status); \
1597                 handled = 1; \
1598                 }
1599
1600 static irqreturn_t goku_irq(int irq, void *_dev)
1601 {
1602         struct goku_udc                 *dev = _dev;
1603         struct goku_udc_regs __iomem    *regs = dev->regs;
1604         struct goku_ep                  *ep;
1605         u32                             stat, handled = 0;
1606         unsigned                        i, rescans = 5;
1607
1608         spin_lock(&dev->lock);
1609
1610 rescan:
1611         stat = readl(&regs->int_status) & dev->int_enable;
1612         if (!stat)
1613                 goto done;
1614         dev->irqs++;
1615
1616         /* device-wide irqs */
1617         if (unlikely(stat & INT_DEVWIDE)) {
1618                 if (stat & INT_SYSERROR) {
1619                         ERROR(dev, "system error\n");
1620                         stop_activity(dev, dev->driver);
1621                         stat = 0;
1622                         handled = 1;
1623                         // FIXME have a neater way to prevent re-enumeration
1624                         dev->driver = NULL;
1625                         goto done;
1626                 }
1627                 if (stat & INT_PWRDETECT) {
1628                         writel(~stat, &regs->int_status);
1629                         if (readl(&dev->regs->power_detect) & PW_DETECT) {
1630                                 VDBG(dev, "connect\n");
1631                                 ep0_start(dev);
1632                         } else {
1633                                 DBG(dev, "disconnect\n");
1634                                 if (dev->gadget.speed == USB_SPEED_FULL)
1635                                         stop_activity(dev, dev->driver);
1636                                 dev->ep0state = EP0_DISCONNECT;
1637                                 dev->int_enable = INT_DEVWIDE;
1638                                 writel(dev->int_enable, &dev->regs->int_enable);
1639                         }
1640                         stat = 0;
1641                         handled = 1;
1642                         goto done;
1643                 }
1644                 if (stat & INT_SUSPEND) {
1645                         ACK(INT_SUSPEND);
1646                         if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1647                                 switch (dev->ep0state) {
1648                                 case EP0_DISCONNECT:
1649                                 case EP0_SUSPEND:
1650                                         goto pm_next;
1651                                 default:
1652                                         break;
1653                                 }
1654                                 DBG(dev, "USB suspend\n");
1655                                 dev->ep0state = EP0_SUSPEND;
1656                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1657                                                 && dev->driver
1658                                                 && dev->driver->suspend) {
1659                                         spin_unlock(&dev->lock);
1660                                         dev->driver->suspend(&dev->gadget);
1661                                         spin_lock(&dev->lock);
1662                                 }
1663                         } else {
1664                                 if (dev->ep0state != EP0_SUSPEND) {
1665                                         DBG(dev, "bogus USB resume %d\n",
1666                                                 dev->ep0state);
1667                                         goto pm_next;
1668                                 }
1669                                 DBG(dev, "USB resume\n");
1670                                 dev->ep0state = EP0_IDLE;
1671                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1672                                                 && dev->driver
1673                                                 && dev->driver->resume) {
1674                                         spin_unlock(&dev->lock);
1675                                         dev->driver->resume(&dev->gadget);
1676                                         spin_lock(&dev->lock);
1677                                 }
1678                         }
1679                 }
1680 pm_next:
1681                 if (stat & INT_USBRESET) {              /* hub reset done */
1682                         ACK(INT_USBRESET);
1683                         INFO(dev, "USB reset done, gadget %s\n",
1684                                 dev->driver->driver.name);
1685                 }
1686                 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1687         }
1688
1689         /* progress ep0 setup, data, or status stages.
1690          * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1691          */
1692         if (stat & INT_SETUP) {
1693                 ACK(INT_SETUP);
1694                 dev->ep[0].irqs++;
1695                 ep0_setup(dev);
1696         }
1697         if (stat & INT_STATUSNAK) {
1698                 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1699                 if (dev->ep0state == EP0_IN) {
1700                         ep = &dev->ep[0];
1701                         ep->irqs++;
1702                         nuke(ep, 0);
1703                         writel(~(1<<0), &regs->EOP);
1704                         dev->ep0state = EP0_STATUS;
1705                 }
1706         }
1707         if (stat & INT_ENDPOINT0) {
1708                 ACK(INT_ENDPOINT0);
1709                 ep = &dev->ep[0];
1710                 ep->irqs++;
1711                 pio_advance(ep);
1712         }
1713
1714         /* dma completion */
1715         if (stat & INT_MSTRDEND) {      /* IN */
1716                 ACK(INT_MSTRDEND);
1717                 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1718                 ep->irqs++;
1719                 dma_advance(dev, ep);
1720         }
1721         if (stat & INT_MSTWREND) {      /* OUT */
1722                 ACK(INT_MSTWREND);
1723                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1724                 ep->irqs++;
1725                 dma_advance(dev, ep);
1726         }
1727         if (stat & INT_MSTWRTMOUT) {    /* OUT */
1728                 ACK(INT_MSTWRTMOUT);
1729                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1730                 ep->irqs++;
1731                 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1732                 // reset dma? then dma_advance()
1733         }
1734
1735         /* pio */
1736         for (i = 1; i < 4; i++) {
1737                 u32             tmp = INT_EPxDATASET(i);
1738
1739                 if (!(stat & tmp))
1740                         continue;
1741                 ep = &dev->ep[i];
1742                 pio_advance(ep);
1743                 if (list_empty (&ep->queue))
1744                         pio_irq_disable(dev, regs, i);
1745                 stat &= ~tmp;
1746                 handled = 1;
1747                 ep->irqs++;
1748         }
1749
1750         if (rescans--)
1751                 goto rescan;
1752
1753 done:
1754         (void)readl(&regs->int_enable);
1755         spin_unlock(&dev->lock);
1756         if (stat)
1757                 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1758                                 readl(&regs->int_status), dev->int_enable);
1759         return IRQ_RETVAL(handled);
1760 }
1761
1762 #undef ACK
1763
1764 /*-------------------------------------------------------------------------*/
1765
1766 static void gadget_release(struct device *_dev)
1767 {
1768         struct goku_udc *dev = dev_get_drvdata(_dev);
1769
1770         kfree(dev);
1771 }
1772
1773 /* tear down the binding between this driver and the pci device */
1774
1775 static void goku_remove(struct pci_dev *pdev)
1776 {
1777         struct goku_udc         *dev = pci_get_drvdata(pdev);
1778
1779         DBG(dev, "%s\n", __FUNCTION__);
1780
1781         BUG_ON(dev->driver);
1782
1783 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1784         remove_proc_entry(proc_node_name, NULL);
1785 #endif
1786         if (dev->regs)
1787                 udc_reset(dev);
1788         if (dev->got_irq)
1789                 free_irq(pdev->irq, dev);
1790         if (dev->regs)
1791                 iounmap(dev->regs);
1792         if (dev->got_region)
1793                 release_mem_region(pci_resource_start (pdev, 0),
1794                                 pci_resource_len (pdev, 0));
1795         if (dev->enabled)
1796                 pci_disable_device(pdev);
1797         device_unregister(&dev->gadget.dev);
1798
1799         pci_set_drvdata(pdev, NULL);
1800         dev->regs = NULL;
1801         the_controller = NULL;
1802
1803         INFO(dev, "unbind\n");
1804 }
1805
1806 /* wrap this driver around the specified pci device, but
1807  * don't respond over USB until a gadget driver binds to us.
1808  */
1809
1810 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1811 {
1812         struct goku_udc         *dev = NULL;
1813         unsigned long           resource, len;
1814         void __iomem            *base = NULL;
1815         int                     retval;
1816
1817         /* if you want to support more than one controller in a system,
1818          * usb_gadget_driver_{register,unregister}() must change.
1819          */
1820         if (the_controller) {
1821                 WARN(dev, "ignoring %s\n", pci_name(pdev));
1822                 return -EBUSY;
1823         }
1824         if (!pdev->irq) {
1825                 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1826                 retval = -ENODEV;
1827                 goto done;
1828         }
1829
1830         /* alloc, and start init */
1831         dev = kmalloc (sizeof *dev, GFP_KERNEL);
1832         if (dev == NULL){
1833                 pr_debug("enomem %s\n", pci_name(pdev));
1834                 retval = -ENOMEM;
1835                 goto done;
1836         }
1837
1838         memset(dev, 0, sizeof *dev);
1839         spin_lock_init(&dev->lock);
1840         dev->pdev = pdev;
1841         dev->gadget.ops = &goku_ops;
1842
1843         /* the "gadget" abstracts/virtualizes the controller */
1844         strcpy(dev->gadget.dev.bus_id, "gadget");
1845         dev->gadget.dev.parent = &pdev->dev;
1846         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1847         dev->gadget.dev.release = gadget_release;
1848         dev->gadget.name = driver_name;
1849
1850         /* now all the pci goodies ... */
1851         retval = pci_enable_device(pdev);
1852         if (retval < 0) {
1853                 DBG(dev, "can't enable, %d\n", retval);
1854                 goto done;
1855         }
1856         dev->enabled = 1;
1857
1858         resource = pci_resource_start(pdev, 0);
1859         len = pci_resource_len(pdev, 0);
1860         if (!request_mem_region(resource, len, driver_name)) {
1861                 DBG(dev, "controller already in use\n");
1862                 retval = -EBUSY;
1863                 goto done;
1864         }
1865         dev->got_region = 1;
1866
1867         base = ioremap_nocache(resource, len);
1868         if (base == NULL) {
1869                 DBG(dev, "can't map memory\n");
1870                 retval = -EFAULT;
1871                 goto done;
1872         }
1873         dev->regs = (struct goku_udc_regs __iomem *) base;
1874
1875         pci_set_drvdata(pdev, dev);
1876         INFO(dev, "%s\n", driver_desc);
1877         INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1878         INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1879
1880         /* init to known state, then setup irqs */
1881         udc_reset(dev);
1882         udc_reinit (dev);
1883         if (request_irq(pdev->irq, goku_irq, IRQF_SHARED/*|IRQF_SAMPLE_RANDOM*/,
1884                         driver_name, dev) != 0) {
1885                 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1886                 retval = -EBUSY;
1887                 goto done;
1888         }
1889         dev->got_irq = 1;
1890         if (use_dma)
1891                 pci_set_master(pdev);
1892
1893
1894 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1895         create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1896 #endif
1897
1898         /* done */
1899         the_controller = dev;
1900         device_register(&dev->gadget.dev);
1901
1902         return 0;
1903
1904 done:
1905         if (dev)
1906                 goku_remove (pdev);
1907         return retval;
1908 }
1909
1910
1911 /*-------------------------------------------------------------------------*/
1912
1913 static struct pci_device_id pci_ids [] = { {
1914         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1915         .class_mask =   ~0,
1916         .vendor =       0x102f,         /* Toshiba */
1917         .device =       0x0107,         /* this UDC */
1918         .subvendor =    PCI_ANY_ID,
1919         .subdevice =    PCI_ANY_ID,
1920
1921 }, { /* end: all zeroes */ }
1922 };
1923 MODULE_DEVICE_TABLE (pci, pci_ids);
1924
1925 static struct pci_driver goku_pci_driver = {
1926         .name =         (char *) driver_name,
1927         .id_table =     pci_ids,
1928
1929         .probe =        goku_probe,
1930         .remove =       goku_remove,
1931
1932         /* FIXME add power management support */
1933 };
1934
1935 static int __init init (void)
1936 {
1937         return pci_register_driver (&goku_pci_driver);
1938 }
1939 module_init (init);
1940
1941 static void __exit cleanup (void)
1942 {
1943         pci_unregister_driver (&goku_pci_driver);
1944 }
1945 module_exit (cleanup);