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