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

   1 /*
   2  * Toshiba TC86C001 ("Goku-S") USB Device Controller driver
   3  *
   4  * Copyright (C) 2000-2002 Lineo
   5  *      by Stuart Lynne, Tom Rushworth, and Bruce Balden
   6  * Copyright (C) 2002 Toshiba Corporation
   7  * Copyright (C) 2003 MontaVista Software (source@mvista.com)
   8  *
   9  * This file is licensed under the terms of the GNU General Public
  10  * License version 2.  This program is licensed "as is" without any
  11  * warranty of any kind, whether express or implied.
  12  */
  13
  14 /*
  15  * This device has ep0 and three semi-configurable bulk/interrupt endpoints.
  16  *
  17  *  - Endpoint numbering is fixed: ep{1,2,3}-bulk
  18  *  - Gadget drivers can choose ep maxpacket (8/16/32/64)
  19  *  - Gadget drivers can choose direction (IN, OUT)
  20  *  - DMA works with ep1 (OUT transfers) and ep2 (IN transfers).
  21  */
  22
  23 #undef DEBUG
  24 // #define      VERBOSE         /* extra debug messages (success too) */
  25 // #define      USB_TRACE       /* packet-level success messages */
  26
  27 #include <linux/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/device.h>
  43 #include <linux/usb_ch9.h>
  44 #include <linux/usb_gadget.h>
  45
  46 #include <asm/byteorder.h>
  47 #include <asm/io.h>
  48 #include <asm/irq.h>
  49 #include <asm/system.h>
  50 #include <asm/unaligned.h>
  51
  52
  53 #include "goku_udc.h"
  54
  55 #define DRIVER_DESC             "TC86C001 USB Device Controller"
  56 #define DRIVER_VERSION          "30-Oct 2003"
  57
  58 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
  59
  60 static const char driver_name [] = "goku_udc";
  61 static const char driver_desc [] = DRIVER_DESC;
  62
  63 MODULE_AUTHOR("source@mvista.com");
  64 MODULE_DESCRIPTION(DRIVER_DESC);
  65 MODULE_LICENSE("GPL");
  66
  67
  68 /*
  69  * IN dma behaves ok under testing, though the IN-dma abort paths don't
  70  * seem to behave quite as expected.  Used by default.
  71  *
  72  * OUT dma documents design problems handling the common "short packet"
  73  * transfer termination policy; it couldn't enabled by default, even
  74  * if the OUT-dma abort problems had a resolution.
  75  */
  76 static unsigned use_dma = 1;
  77
  78 #if 0
  79 //#include <linux/moduleparam.h>
  80 /* "modprobe goku_udc use_dma=1" etc
  81  *      0 to disable dma
  82  *      1 to use IN dma only (normal operation)
  83  *      2 to use IN and OUT dma
  84  */
  85 module_param(use_dma, uint, S_IRUGO);
  86 #endif
  87
  88 /*-------------------------------------------------------------------------*/
  89
  90 static void nuke(struct goku_ep *, int status);
  91
  92 static inline void
  93 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
  94 {
  95         writel(COMMAND_EP(epnum) | command, &regs->Command);
  96         udelay(300);
  97 }
  98
  99 static int
 100 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 101 {
 102         struct goku_udc *dev;
 103         struct goku_ep  *ep;
 104         u32             mode;
 105         u16             max;
 106         unsigned long   flags;
 107
 108         ep = container_of(_ep, struct goku_ep, ep);
 109         if (!_ep || !desc || ep->desc
 110                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 111                 return -EINVAL;
 112         dev = ep->dev;
 113         if (ep == &dev->ep[0])
 114                 return -EINVAL;
 115         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 116                 return -ESHUTDOWN;
 117         if (ep->num != (desc->bEndpointAddress & 0x0f))
 118                 return -EINVAL;
 119
 120         switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 121         case USB_ENDPOINT_XFER_BULK:
 122         case USB_ENDPOINT_XFER_INT:
 123                 break;
 124         default:
 125                 return -EINVAL;
 126         }
 127
 128         if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
 129                         != EPxSTATUS_EP_INVALID)
 130                 return -EBUSY;
 131
 132         /* enabling the no-toggle interrupt mode would need an api hook */
 133         mode = 0;
 134         max = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 135         switch (max) {
 136         case 64:        mode++;
 137         case 32:        mode++;
 138         case 16:        mode++;
 139         case 8:         mode <<= 3;
 140                         break;
 141         default:
 142                 return -EINVAL;
 143         }
 144         mode |= 2 << 1;         /* bulk, or intr-with-toggle */
 145
 146         /* ep1/ep2 dma direction is chosen early; it works in the other
 147          * direction, with pio.  be cautious with out-dma.
 148          */
 149         ep->is_in = (USB_DIR_IN & desc->bEndpointAddress) != 0;
 150         if (ep->is_in) {
 151                 mode |= 1;
 152                 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
 153         } else {
 154                 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
 155                 if (ep->dma)
 156                         DBG(dev, "%s out-dma hides short packets\n",
 157                                 ep->ep.name);
 158         }
 159
 160         spin_lock_irqsave(&ep->dev->lock, flags);
 161
 162         /* ep1 and ep2 can do double buffering and/or dma */
 163         if (ep->num < 3) {
 164                 struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 165                 u32                             tmp;
 166
 167                 /* double buffer except (for now) with pio in */
 168                 tmp = ((ep->dma || !ep->is_in)
 169                                 ? 0x10  /* double buffered */
 170                                 : 0x11  /* single buffer */
 171                         ) << ep->num;
 172                 tmp |= readl(&regs->EPxSingle);
 173                 writel(tmp, &regs->EPxSingle);
 174
 175                 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
 176                 tmp |= readl(&regs->EPxBCS);
 177                 writel(tmp, &regs->EPxBCS);
 178         }
 179         writel(mode, ep->reg_mode);
 180         command(ep->dev->regs, COMMAND_RESET, ep->num);
 181         ep->ep.maxpacket = max;
 182         ep->stopped = 0;
 183         ep->desc = desc;
 184         spin_unlock_irqrestore(&ep->dev->lock, flags);
 185
 186         DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
 187                 ep->is_in ? "IN" : "OUT",
 188                 ep->dma ? "dma" : "pio",
 189                 max);
 190
 191         return 0;
 192 }
 193
 194 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
 195 {
 196         struct goku_udc         *dev = ep->dev;
 197
 198         if (regs) {
 199                 command(regs, COMMAND_INVALID, ep->num);
 200                 if (ep->num) {
 201                         if (ep->num == UDC_MSTWR_ENDPOINT)
 202                                 dev->int_enable &= ~(INT_MSTWREND
 203                                                         |INT_MSTWRTMOUT);
 204                         else if (ep->num == UDC_MSTRD_ENDPOINT)
 205                                 dev->int_enable &= ~INT_MSTRDEND;
 206                         dev->int_enable &= ~INT_EPxDATASET (ep->num);
 207                 } else
 208                         dev->int_enable &= ~INT_EP0;
 209                 writel(dev->int_enable, &regs->int_enable);
 210                 readl(&regs->int_enable);
 211                 if (ep->num < 3) {
 212                         struct goku_udc_regs __iomem    *r = ep->dev->regs;
 213                         u32                             tmp;
 214
 215                         tmp = readl(&r->EPxSingle);
 216                         tmp &= ~(0x11 << ep->num);
 217                         writel(tmp, &r->EPxSingle);
 218
 219                         tmp = readl(&r->EPxBCS);
 220                         tmp &= ~(0x11 << ep->num);
 221                         writel(tmp, &r->EPxBCS);
 222                 }
 223                 /* reset dma in case we're still using it */
 224                 if (ep->dma) {
 225                         u32     master;
 226
 227                         master = readl(&regs->dma_master) & MST_RW_BITS;
 228                         if (ep->num == UDC_MSTWR_ENDPOINT) {
 229                                 master &= ~MST_W_BITS;
 230                                 master |= MST_WR_RESET;
 231                         } else {
 232                                 master &= ~MST_R_BITS;
 233                                 master |= MST_RD_RESET;
 234                         }
 235                         writel(master, &regs->dma_master);
 236                 }
 237         }
 238
 239         ep->ep.maxpacket = MAX_FIFO_SIZE;
 240         ep->desc = NULL;
 241         ep->stopped = 1;
 242         ep->irqs = 0;
 243         ep->dma = 0;
 244 }
 245
 246 static int goku_ep_disable(struct usb_ep *_ep)
 247 {
 248         struct goku_ep  *ep;
 249         struct goku_udc *dev;
 250         unsigned long   flags;
 251
 252         ep = container_of(_ep, struct goku_ep, ep);
 253         if (!_ep || !ep->desc)
 254                 return -ENODEV;
 255         dev = ep->dev;
 256         if (dev->ep0state == EP0_SUSPEND)
 257                 return -EBUSY;
 258
 259         VDBG(dev, "disable %s\n", _ep->name);
 260
 261         spin_lock_irqsave(&dev->lock, flags);
 262         nuke(ep, -ESHUTDOWN);
 263         ep_reset(dev->regs, ep);
 264         spin_unlock_irqrestore(&dev->lock, flags);
 265
 266         return 0;
 267 }
 268
 269 /*-------------------------------------------------------------------------*/
 270
 271 static struct usb_request *
 272 goku_alloc_request(struct usb_ep *_ep, int gfp_flags)
 273 {
 274         struct goku_request     *req;
 275
 276         if (!_ep)
 277                 return NULL;
 278         req = kmalloc(sizeof *req, gfp_flags);
 279         if (!req)
 280                 return NULL;
 281
 282         memset(req, 0, sizeof *req);
 283         req->req.dma = DMA_ADDR_INVALID;
 284         INIT_LIST_HEAD(&req->queue);
 285         return &req->req;
 286 }
 287
 288 static void
 289 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
 290 {
 291         struct goku_request     *req;
 292
 293         if (!_ep || !_req)
 294                 return;
 295
 296         req = container_of(_req, struct goku_request, req);
 297         WARN_ON(!list_empty(&req->queue));
 298         kfree(req);
 299 }
 300
 301 /*-------------------------------------------------------------------------*/
 302
 303 #undef USE_KMALLOC
 304
 305 /* many common platforms have dma-coherent caches, which means that it's
 306  * safe to use kmalloc() memory for all i/o buffers without using any
 307  * cache flushing calls.  (unless you're trying to share cache lines
 308  * between dma and non-dma activities, which is a slow idea in any case.)
 309  *
 310  * other platforms need more care, with 2.6 having a moderately general
 311  * solution except for the common "buffer is smaller than a page" case.
 312  */
 313 #if     defined(CONFIG_X86)
 314 #define USE_KMALLOC
 315
 316 #elif   defined(CONFIG_MIPS) && !defined(CONFIG_NONCOHERENT_IO)
 317 #define USE_KMALLOC
 318
 319 #elif   defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
 320 #define USE_KMALLOC
 321
 322 #endif
 323
 324 /* allocating buffers this way eliminates dma mapping overhead, which
 325  * on some platforms will mean eliminating a per-io buffer copy.  with
 326  * some kinds of system caches, further tweaks may still be needed.
 327  */
 328 static void *
 329 goku_alloc_buffer(struct usb_ep *_ep, unsigned bytes,
 330                         dma_addr_t *dma, int  gfp_flags)
 331 {
 332         void            *retval;
 333         struct goku_ep  *ep;
 334
 335         ep = container_of(_ep, struct goku_ep, ep);
 336         if (!_ep)
 337                 return NULL;
 338         *dma = DMA_ADDR_INVALID;
 339
 340 #if     defined(USE_KMALLOC)
 341         retval = kmalloc(bytes, gfp_flags);
 342         if (retval)
 343                 *dma = virt_to_phys(retval);
 344 #else
 345         if (ep->dma) {
 346                 /* the main problem with this call is that it wastes memory
 347                  * on typical 1/N page allocations: it allocates 1-N pages.
 348                  */
 349 #warning Using dma_alloc_coherent even with buffers smaller than a page.
 350                 retval = dma_alloc_coherent(&ep->dev->pdev->dev,
 351                                 bytes, dma, gfp_flags);
 352         } else
 353                 retval = kmalloc(bytes, gfp_flags);
 354 #endif
 355         return retval;
 356 }
 357
 358 static void
 359 goku_free_buffer(struct usb_ep *_ep, void *buf, dma_addr_t dma, unsigned bytes)
 360 {
 361         /* free memory into the right allocator */
 362 #ifndef USE_KMALLOC
 363         if (dma != DMA_ADDR_INVALID) {
 364                 struct goku_ep  *ep;
 365
 366                 ep = container_of(_ep, struct goku_ep, ep);
 367                 if (!_ep)
 368                         return;
 369                 dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma);
 370         } else
 371 #endif
 372                 kfree (buf);
 373 }
 374
 375 /*-------------------------------------------------------------------------*/
 376
 377 static void
 378 done(struct goku_ep *ep, struct goku_request *req, int status)
 379 {
 380         struct goku_udc         *dev;
 381         unsigned                stopped = ep->stopped;
 382
 383         list_del_init(&req->queue);
 384
 385         if (likely(req->req.status == -EINPROGRESS))
 386                 req->req.status = status;
 387         else
 388                 status = req->req.status;
 389
 390         dev = ep->dev;
 391         if (req->mapped) {
 392                 pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
 393                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 394                 req->req.dma = DMA_ADDR_INVALID;
 395                 req->mapped = 0;
 396         }
 397
 398 #ifndef USB_TRACE
 399         if (status && status != -ESHUTDOWN)
 400 #endif
 401                 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
 402                         ep->ep.name, &req->req, status,
 403                         req->req.actual, req->req.length);
 404
 405         /* don't modify queue heads during completion callback */
 406         ep->stopped = 1;
 407         spin_unlock(&dev->lock);
 408         req->req.complete(&ep->ep, &req->req);
 409         spin_lock(&dev->lock);
 410         ep->stopped = stopped;
 411 }
 412
 413 /*-------------------------------------------------------------------------*/
 414
 415 static inline int
 416 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
 417 {
 418         unsigned        length, count;
 419
 420         length = min(req->req.length - req->req.actual, max);
 421         req->req.actual += length;
 422
 423         count = length;
 424         while (likely(count--))
 425                 writel(*buf++, fifo);
 426         return length;
 427 }
 428
 429 // return:  0 = still running, 1 = completed, negative = errno
 430 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
 431 {
 432         struct goku_udc *dev = ep->dev;
 433         u32             tmp;
 434         u8              *buf;
 435         unsigned        count;
 436         int             is_last;
 437
 438         tmp = readl(&dev->regs->DataSet);
 439         buf = req->req.buf + req->req.actual;
 440         prefetch(buf);
 441
 442         dev = ep->dev;
 443         if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
 444                 return -EL2HLT;
 445
 446         /* NOTE:  just single-buffered PIO-IN for now.  */
 447         if (unlikely((tmp & DATASET_A(ep->num)) != 0))
 448                 return 0;
 449
 450         /* clear our "packet available" irq */
 451         if (ep->num != 0)
 452                 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
 453
 454         count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
 455
 456         /* last packet often short (sometimes a zlp, especially on ep0) */
 457         if (unlikely(count != ep->ep.maxpacket)) {
 458                 writel(~(1<<ep->num), &dev->regs->EOP);
 459                 if (ep->num == 0) {
 460                         dev->ep[0].stopped = 1;
 461                         dev->ep0state = EP0_STATUS;
 462                 }
 463                 is_last = 1;
 464         } else {
 465                 if (likely(req->req.length != req->req.actual)
 466                                 || req->req.zero)
 467                         is_last = 0;
 468                 else
 469                         is_last = 1;
 470         }
 471 #if 0           /* printk seemed to trash is_last...*/
 472 //#ifdef USB_TRACE
 473         VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
 474                 ep->ep.name, count, is_last ? "/last" : "",
 475                 req->req.length - req->req.actual, req);
 476 #endif
 477
 478         /* requests complete when all IN data is in the FIFO,
 479          * or sometimes later, if a zlp was needed.
 480          */
 481         if (is_last) {
 482                 done(ep, req, 0);
 483                 return 1;
 484         }
 485
 486         return 0;
 487 }
 488
 489 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
 490 {
 491         struct goku_udc_regs __iomem    *regs;
 492         u32                             size, set;
 493         u8                              *buf;
 494         unsigned                        bufferspace, is_short, dbuff;
 495
 496         regs = ep->dev->regs;
 497 top:
 498         buf = req->req.buf + req->req.actual;
 499         prefetchw(buf);
 500
 501         if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
 502                 return -EL2HLT;
 503
 504         dbuff = (ep->num == 1 || ep->num == 2);
 505         do {
 506                 /* ack dataset irq matching the status we'll handle */
 507                 if (ep->num != 0)
 508                         writel(~INT_EPxDATASET(ep->num), &regs->int_status);
 509
 510                 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
 511                 size = readl(&regs->EPxSizeLA[ep->num]);
 512                 bufferspace = req->req.length - req->req.actual;
 513
 514                 /* usually do nothing without an OUT packet */
 515                 if (likely(ep->num != 0 || bufferspace != 0)) {
 516                         if (unlikely(set == 0))
 517                                 break;
 518                         /* use ep1/ep2 double-buffering for OUT */
 519                         if (!(size & PACKET_ACTIVE))
 520                                 size = readl(&regs->EPxSizeLB[ep->num]);
 521                         if (!(size & PACKET_ACTIVE))    // "can't happen"
 522                                 break;
 523                         size &= DATASIZE;       /* EPxSizeH == 0 */
 524
 525                 /* ep0out no-out-data case for set_config, etc */
 526                 } else
 527                         size = 0;
 528
 529                 /* read all bytes from this packet */
 530                 req->req.actual += size;
 531                 is_short = (size < ep->ep.maxpacket);
 532 #ifdef USB_TRACE
 533                 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
 534                         ep->ep.name, size, is_short ? "/S" : "",
 535                         req, req->req.actual, req->req.length);
 536 #endif
 537                 while (likely(size-- != 0)) {
 538                         u8      byte = (u8) readl(ep->reg_fifo);
 539
 540                         if (unlikely(bufferspace == 0)) {
 541                                 /* this happens when the driver's buffer
 542                                  * is smaller than what the host sent.
 543                                  * discard the extra data in this packet.
 544                                  */
 545                                 if (req->req.status != -EOVERFLOW)
 546                                         DBG(ep->dev, "%s overflow %u\n",
 547                                                 ep->ep.name, size);
 548                                 req->req.status = -EOVERFLOW;
 549                         } else {
 550                                 *buf++ = byte;
 551                                 bufferspace--;
 552                         }
 553                 }
 554
 555                 /* completion */
 556                 if (unlikely(is_short || req->req.actual == req->req.length)) {
 557                         if (unlikely(ep->num == 0)) {
 558                                 /* non-control endpoints now usable? */
 559                                 if (ep->dev->req_config)
 560                                         writel(ep->dev->configured
 561                                                         ? USBSTATE_CONFIGURED
 562                                                         : 0,
 563                                                 &regs->UsbState);
 564                                 /* ep0out status stage */
 565                                 writel(~(1<<0), &regs->EOP);
 566                                 ep->stopped = 1;
 567                                 ep->dev->ep0state = EP0_STATUS;
 568                         }
 569                         done(ep, req, 0);
 570
 571                         /* empty the second buffer asap */
 572                         if (dbuff && !list_empty(&ep->queue)) {
 573                                 req = list_entry(ep->queue.next,
 574                                                 struct goku_request, queue);
 575                                 goto top;
 576                         }
 577                         return 1;
 578                 }
 579         } while (dbuff);
 580         return 0;
 581 }
 582
 583 static inline void
 584 pio_irq_enable(struct goku_udc *dev,
 585                 struct goku_udc_regs __iomem *regs, int epnum)
 586 {
 587         dev->int_enable |= INT_EPxDATASET (epnum);
 588         writel(dev->int_enable, &regs->int_enable);
 589         /* write may still be posted */
 590 }
 591
 592 static inline void
 593 pio_irq_disable(struct goku_udc *dev,
 594                 struct goku_udc_regs __iomem *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 __iomem    *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 __iomem    *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 __iomem    *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 = NULL;
 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 = NULL;
 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                         && (readl(&ep->dev->regs->DataSet)
 990                                         & DATASET_AB(ep->num)))
 991                 retval = -EAGAIN;
 992         else if (!value)
 993                 goku_clear_halt(ep);
 994         else {
 995                 ep->stopped = 1;
 996                 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
 997                 command(ep->dev->regs, COMMAND_STALL, ep->num);
 998                 readl(ep->reg_status);
 999         }
1000         spin_unlock_irqrestore(&ep->dev->lock, flags);
1001         return retval;
1002 }
1003
1004 static int goku_fifo_status(struct usb_ep *_ep)
1005 {
1006         struct goku_ep                  *ep;
1007         struct goku_udc_regs __iomem    *regs;
1008         u32                             size;
1009
1010         if (!_ep)
1011                 return -ENODEV;
1012         ep = container_of(_ep, struct goku_ep, ep);
1013
1014         /* size is only reported sanely for OUT */
1015         if (ep->is_in)
1016                 return -EOPNOTSUPP;
1017
1018         /* ignores 16-byte dma buffer; SizeH == 0 */
1019         regs = ep->dev->regs;
1020         size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
1021         size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
1022         VDBG(ep->dev, "%s %s %u\n", __FUNCTION__, ep->ep.name, size);
1023         return size;
1024 }
1025
1026 static void goku_fifo_flush(struct usb_ep *_ep)
1027 {
1028         struct goku_ep                  *ep;
1029         struct goku_udc_regs __iomem    *regs;
1030         u32                             size;
1031
1032         if (!_ep)
1033                 return;
1034         ep = container_of(_ep, struct goku_ep, ep);
1035         VDBG(ep->dev, "%s %s\n", __FUNCTION__, ep->ep.name);
1036
1037         /* don't change EPxSTATUS_EP_INVALID to READY */
1038         if (!ep->desc && ep->num != 0) {
1039                 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
1040                 return;
1041         }
1042
1043         regs = ep->dev->regs;
1044         size = readl(&regs->EPxSizeLA[ep->num]);
1045         size &= DATASIZE;
1046
1047         /* Non-desirable behavior:  FIFO_CLEAR also clears the
1048          * endpoint halt feature.  For OUT, we _could_ just read
1049          * the bytes out (PIO, if !ep->dma); for in, no choice.
1050          */
1051         if (size)
1052                 command(regs, COMMAND_FIFO_CLEAR, ep->num);
1053 }
1054
1055 static struct usb_ep_ops goku_ep_ops = {
1056         .enable         = goku_ep_enable,
1057         .disable        = goku_ep_disable,
1058
1059         .alloc_request  = goku_alloc_request,
1060         .free_request   = goku_free_request,
1061
1062         .alloc_buffer   = goku_alloc_buffer,
1063         .free_buffer    = goku_free_buffer,
1064
1065         .queue          = goku_queue,
1066         .dequeue        = goku_dequeue,
1067
1068         .set_halt       = goku_set_halt,
1069         .fifo_status    = goku_fifo_status,
1070         .fifo_flush     = goku_fifo_flush,
1071 };
1072
1073 /*-------------------------------------------------------------------------*/
1074
1075 static int goku_get_frame(struct usb_gadget *_gadget)
1076 {
1077         return -EOPNOTSUPP;
1078 }
1079
1080 static const struct usb_gadget_ops goku_ops = {
1081         .get_frame      = goku_get_frame,
1082         // no remote wakeup
1083         // not selfpowered
1084 };
1085
1086 /*-------------------------------------------------------------------------*/
1087
1088 static inline char *dmastr(void)
1089 {
1090         if (use_dma == 0)
1091                 return "(dma disabled)";
1092         else if (use_dma == 2)
1093                 return "(dma IN and OUT)";
1094         else
1095                 return "(dma IN)";
1096 }
1097
1098 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1099
1100 static const char proc_node_name [] = "driver/udc";
1101
1102 #define FOURBITS "%s%s%s%s"
1103 #define EIGHTBITS FOURBITS FOURBITS
1104
1105 static void
1106 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1107 {
1108         int t;
1109
1110         /* int_status is the same format ... */
1111         t = scnprintf(*next, *size,
1112                 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1113                 label, mask,
1114                 (mask & INT_PWRDETECT) ? " power" : "",
1115                 (mask & INT_SYSERROR) ? " sys" : "",
1116                 (mask & INT_MSTRDEND) ? " in-dma" : "",
1117                 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1118
1119                 (mask & INT_MSTWREND) ? " out-dma" : "",
1120                 (mask & INT_MSTWRSET) ? " wrset" : "",
1121                 (mask & INT_ERR) ? " err" : "",
1122                 (mask & INT_SOF) ? " sof" : "",
1123
1124                 (mask & INT_EP3NAK) ? " ep3nak" : "",
1125                 (mask & INT_EP2NAK) ? " ep2nak" : "",
1126                 (mask & INT_EP1NAK) ? " ep1nak" : "",
1127                 (mask & INT_EP3DATASET) ? " ep3" : "",
1128
1129                 (mask & INT_EP2DATASET) ? " ep2" : "",
1130                 (mask & INT_EP1DATASET) ? " ep1" : "",
1131                 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1132                 (mask & INT_STATUS) ? " ep0status" : "",
1133
1134                 (mask & INT_SETUP) ? " setup" : "",
1135                 (mask & INT_ENDPOINT0) ? " ep0" : "",
1136                 (mask & INT_USBRESET) ? " reset" : "",
1137                 (mask & INT_SUSPEND) ? " suspend" : "");
1138         *size -= t;
1139         *next += t;
1140 }
1141
1142
1143 static int
1144 udc_proc_read(char *buffer, char **start, off_t off, int count,
1145                 int *eof, void *_dev)
1146 {
1147         char                            *buf = buffer;
1148         struct goku_udc                 *dev = _dev;
1149         struct goku_udc_regs __iomem    *regs = dev->regs;
1150         char                            *next = buf;
1151         unsigned                        size = count;
1152         unsigned long                   flags;
1153         int                             i, t, is_usb_connected;
1154         u32                             tmp;
1155
1156         if (off != 0)
1157                 return 0;
1158
1159         local_irq_save(flags);
1160
1161         /* basic device status */
1162         tmp = readl(&regs->power_detect);
1163         is_usb_connected = tmp & PW_DETECT;
1164         t = scnprintf(next, size,
1165                 "%s - %s\n"
1166                 "%s version: %s %s\n"
1167                 "Gadget driver: %s\n"
1168                 "Host %s, %s\n"
1169                 "\n",
1170                 pci_name(dev->pdev), driver_desc,
1171                 driver_name, DRIVER_VERSION, dmastr(),
1172                 dev->driver ? dev->driver->driver.name : "(none)",
1173                 is_usb_connected
1174                         ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1175                         : "disconnected",
1176                 ({char *tmp;
1177                 switch(dev->ep0state){
1178                 case EP0_DISCONNECT:    tmp = "ep0_disconnect"; break;
1179                 case EP0_IDLE:          tmp = "ep0_idle"; break;
1180                 case EP0_IN:            tmp = "ep0_in"; break;
1181                 case EP0_OUT:           tmp = "ep0_out"; break;
1182                 case EP0_STATUS:        tmp = "ep0_status"; break;
1183                 case EP0_STALL:         tmp = "ep0_stall"; break;
1184                 case EP0_SUSPEND:       tmp = "ep0_suspend"; break;
1185                 default:                tmp = "ep0_?"; break;
1186                 } tmp; })
1187                 );
1188         size -= t;
1189         next += t;
1190
1191         dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1192         dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1193
1194         if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1195                 goto done;
1196
1197         /* registers for (active) device and ep0 */
1198         t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1199                         "single.bcs %02x.%02x state %x addr %u\n",
1200                         dev->irqs, readl(&regs->DataSet),
1201                         readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1202                         readl(&regs->UsbState),
1203                         readl(&regs->address));
1204         size -= t;
1205         next += t;
1206
1207         tmp = readl(&regs->dma_master);
1208         t = scnprintf(next, size,
1209                 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1210                 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1211                 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1212                 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1213                 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1214
1215                 (tmp & MST_RD_EOPB) ? " eopb" : "",
1216                 (tmp & MST_RD_RESET) ? " in_reset" : "",
1217                 (tmp & MST_WR_RESET) ? " out_reset" : "",
1218                 (tmp & MST_RD_ENA) ? " IN" : "",
1219
1220                 (tmp & MST_WR_ENA) ? " OUT" : "",
1221                 (tmp & MST_CONNECTION)
1222                         ? "ep1in/ep2out"
1223                         : "ep1out/ep2in");
1224         size -= t;
1225         next += t;
1226
1227         /* dump endpoint queues */
1228         for (i = 0; i < 4; i++) {
1229                 struct goku_ep          *ep = &dev->ep [i];
1230                 struct goku_request     *req;
1231                 int                     t;
1232
1233                 if (i && !ep->desc)
1234                         continue;
1235
1236                 tmp = readl(ep->reg_status);
1237                 t = scnprintf(next, size,
1238                         "%s %s max %u %s, irqs %lu, "
1239                         "status %02x (%s) " FOURBITS "\n",
1240                         ep->ep.name,
1241                         ep->is_in ? "in" : "out",
1242                         ep->ep.maxpacket,
1243                         ep->dma ? "dma" : "pio",
1244                         ep->irqs,
1245                         tmp, ({ char *s;
1246                         switch (tmp & EPxSTATUS_EP_MASK) {
1247                         case EPxSTATUS_EP_READY:
1248                                 s = "ready"; break;
1249                         case EPxSTATUS_EP_DATAIN:
1250                                 s = "packet"; break;
1251                         case EPxSTATUS_EP_FULL:
1252                                 s = "full"; break;
1253                         case EPxSTATUS_EP_TX_ERR:       // host will retry
1254                                 s = "tx_err"; break;
1255                         case EPxSTATUS_EP_RX_ERR:
1256                                 s = "rx_err"; break;
1257                         case EPxSTATUS_EP_BUSY:         /* ep0 only */
1258                                 s = "busy"; break;
1259                         case EPxSTATUS_EP_STALL:
1260                                 s = "stall"; break;
1261                         case EPxSTATUS_EP_INVALID:      // these "can't happen"
1262                                 s = "invalid"; break;
1263                         default:
1264                                 s = "?"; break;
1265                         }; s; }),
1266                         (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1267                         (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1268                         (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1269                         (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1270                         );
1271                 if (t <= 0 || t > size)
1272                         goto done;
1273                 size -= t;
1274                 next += t;
1275
1276                 if (list_empty(&ep->queue)) {
1277                         t = scnprintf(next, size, "\t(nothing queued)\n");
1278                         if (t <= 0 || t > size)
1279                                 goto done;
1280                         size -= t;
1281                         next += t;
1282                         continue;
1283                 }
1284                 list_for_each_entry(req, &ep->queue, queue) {
1285                         if (ep->dma && req->queue.prev == &ep->queue) {
1286                                 if (i == UDC_MSTRD_ENDPOINT)
1287                                         tmp = readl(&regs->in_dma_current);
1288                                 else
1289                                         tmp = readl(&regs->out_dma_current);
1290                                 tmp -= req->req.dma;
1291                                 tmp++;
1292                         } else
1293                                 tmp = req->req.actual;
1294
1295                         t = scnprintf(next, size,
1296                                 "\treq %p len %u/%u buf %p\n",
1297                                 &req->req, tmp, req->req.length,
1298                                 req->req.buf);
1299                         if (t <= 0 || t > size)
1300                                 goto done;
1301                         size -= t;
1302                         next += t;
1303                 }
1304         }
1305
1306 done:
1307         local_irq_restore(flags);
1308         *eof = 1;
1309         return count - size;
1310 }
1311
1312 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1313
1314 /*-------------------------------------------------------------------------*/
1315
1316 static void udc_reinit (struct goku_udc *dev)
1317 {
1318         static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1319
1320         unsigned i;
1321
1322         INIT_LIST_HEAD (&dev->gadget.ep_list);
1323         dev->gadget.ep0 = &dev->ep [0].ep;
1324         dev->gadget.speed = USB_SPEED_UNKNOWN;
1325         dev->ep0state = EP0_DISCONNECT;
1326         dev->irqs = 0;
1327
1328         for (i = 0; i < 4; i++) {
1329                 struct goku_ep  *ep = &dev->ep[i];
1330
1331                 ep->num = i;
1332                 ep->ep.name = names[i];
1333                 ep->reg_fifo = &dev->regs->ep_fifo [i];
1334                 ep->reg_status = &dev->regs->ep_status [i];
1335                 ep->reg_mode = &dev->regs->ep_mode[i];
1336
1337                 ep->ep.ops = &goku_ep_ops;
1338                 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1339                 ep->dev = dev;
1340                 INIT_LIST_HEAD (&ep->queue);
1341
1342                 ep_reset(NULL, ep);
1343         }
1344
1345         dev->ep[0].reg_mode = NULL;
1346         dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1347         list_del_init (&dev->ep[0].ep.ep_list);
1348 }
1349
1350 static void udc_reset(struct goku_udc *dev)
1351 {
1352         struct goku_udc_regs __iomem    *regs = dev->regs;
1353
1354         writel(0, &regs->power_detect);
1355         writel(0, &regs->int_enable);
1356         readl(&regs->int_enable);
1357         dev->int_enable = 0;
1358
1359         /* deassert reset, leave USB D+ at hi-Z (no pullup)
1360          * don't let INT_PWRDETECT sequence begin
1361          */
1362         udelay(250);
1363         writel(PW_RESETB, &regs->power_detect);
1364         readl(&regs->int_enable);
1365 }
1366
1367 static void ep0_start(struct goku_udc *dev)
1368 {
1369         struct goku_udc_regs __iomem    *regs = dev->regs;
1370         unsigned                        i;
1371
1372         VDBG(dev, "%s\n", __FUNCTION__);
1373
1374         udc_reset(dev);
1375         udc_reinit (dev);
1376         //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1377
1378         /* hw handles set_address, set_feature, get_status; maybe more */
1379         writel(   G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1380                 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1381                 | G_REQMODE_GET_DESC
1382                 | G_REQMODE_CLEAR_FEAT
1383                 , &regs->reqmode);
1384
1385         for (i = 0; i < 4; i++)
1386                 dev->ep[i].irqs = 0;
1387
1388         /* can't modify descriptors after writing UsbReady */
1389         for (i = 0; i < DESC_LEN; i++)
1390                 writel(0, &regs->descriptors[i]);
1391         writel(0, &regs->UsbReady);
1392
1393         /* expect ep0 requests when the host drops reset */
1394         writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1395         dev->int_enable = INT_DEVWIDE | INT_EP0;
1396         writel(dev->int_enable, &dev->regs->int_enable);
1397         readl(&regs->int_enable);
1398         dev->gadget.speed = USB_SPEED_FULL;
1399         dev->ep0state = EP0_IDLE;
1400 }
1401
1402 static void udc_enable(struct goku_udc *dev)
1403 {
1404         /* start enumeration now, or after power detect irq */
1405         if (readl(&dev->regs->power_detect) & PW_DETECT)
1406                 ep0_start(dev);
1407         else {
1408                 DBG(dev, "%s\n", __FUNCTION__);
1409                 dev->int_enable = INT_PWRDETECT;
1410                 writel(dev->int_enable, &dev->regs->int_enable);
1411         }
1412 }
1413
1414 /*-------------------------------------------------------------------------*/
1415
1416 /* keeping it simple:
1417  * - one bus driver, initted first;
1418  * - one function driver, initted second
1419  */
1420
1421 static struct goku_udc  *the_controller;
1422
1423 /* when a driver is successfully registered, it will receive
1424  * control requests including set_configuration(), which enables
1425  * non-control requests.  then usb traffic follows until a
1426  * disconnect is reported.  then a host may connect again, or
1427  * the driver might get unbound.
1428  */
1429 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1430 {
1431         struct goku_udc *dev = the_controller;
1432         int                     retval;
1433
1434         if (!driver
1435                         || driver->speed != USB_SPEED_FULL
1436                         || !driver->bind
1437                         || !driver->unbind
1438                         || !driver->disconnect
1439                         || !driver->setup)
1440                 return -EINVAL;
1441         if (!dev)
1442                 return -ENODEV;
1443         if (dev->driver)
1444                 return -EBUSY;
1445
1446         /* hook up the driver */
1447         driver->driver.bus = NULL;
1448         dev->driver = driver;
1449         dev->gadget.dev.driver = &driver->driver;
1450         retval = driver->bind(&dev->gadget);
1451         if (retval) {
1452                 DBG(dev, "bind to driver %s --> error %d\n",
1453                                 driver->driver.name, retval);
1454                 dev->driver = NULL;
1455                 dev->gadget.dev.driver = NULL;
1456                 return retval;
1457         }
1458
1459         /* then enable host detection and ep0; and we're ready
1460          * for set_configuration as well as eventual disconnect.
1461          */
1462         udc_enable(dev);
1463
1464         DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1465         return 0;
1466 }
1467 EXPORT_SYMBOL(usb_gadget_register_driver);
1468
1469 static void
1470 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1471 {
1472         unsigned        i;
1473
1474         DBG (dev, "%s\n", __FUNCTION__);
1475
1476         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1477                 driver = NULL;
1478
1479         /* disconnect gadget driver after quiesceing hw and the driver */
1480         udc_reset (dev);
1481         for (i = 0; i < 4; i++)
1482                 nuke(&dev->ep [i], -ESHUTDOWN);
1483         if (driver) {
1484                 spin_unlock(&dev->lock);
1485                 driver->disconnect(&dev->gadget);
1486                 spin_lock(&dev->lock);
1487         }
1488
1489         if (dev->driver)
1490                 udc_enable(dev);
1491 }
1492
1493 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1494 {
1495         struct goku_udc *dev = the_controller;
1496         unsigned long   flags;
1497
1498         if (!dev)
1499                 return -ENODEV;
1500         if (!driver || driver != dev->driver)
1501                 return -EINVAL;
1502
1503         spin_lock_irqsave(&dev->lock, flags);
1504         dev->driver = NULL;
1505         stop_activity(dev, driver);
1506         spin_unlock_irqrestore(&dev->lock, flags);
1507
1508         driver->unbind(&dev->gadget);
1509
1510         DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1511         return 0;
1512 }
1513 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1514
1515
1516 /*-------------------------------------------------------------------------*/
1517
1518 static void ep0_setup(struct goku_udc *dev)
1519 {
1520         struct goku_udc_regs __iomem    *regs = dev->regs;
1521         struct usb_ctrlrequest          ctrl;
1522         int                             tmp;
1523
1524         /* read SETUP packet and enter DATA stage */
1525         ctrl.bRequestType = readl(&regs->bRequestType);
1526         ctrl.bRequest = readl(&regs->bRequest);
1527         ctrl.wValue  = (readl(&regs->wValueH)  << 8) | readl(&regs->wValueL);
1528         ctrl.wIndex  = (readl(&regs->wIndexH)  << 8) | readl(&regs->wIndexL);
1529         ctrl.wLength = (readl(&regs->wLengthH) << 8) | readl(&regs->wLengthL);
1530         writel(0, &regs->SetupRecv);
1531
1532         nuke(&dev->ep[0], 0);
1533         dev->ep[0].stopped = 0;
1534         if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1535                 dev->ep[0].is_in = 1;
1536                 dev->ep0state = EP0_IN;
1537                 /* detect early status stages */
1538                 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1539         } else {
1540                 dev->ep[0].is_in = 0;
1541                 dev->ep0state = EP0_OUT;
1542
1543                 /* NOTE:  CLEAR_FEATURE is done in software so that we can
1544                  * synchronize transfer restarts after bulk IN stalls.  data
1545                  * won't even enter the fifo until the halt is cleared.
1546                  */
1547                 switch (ctrl.bRequest) {
1548                 case USB_REQ_CLEAR_FEATURE:
1549                         switch (ctrl.bRequestType) {
1550                         case USB_RECIP_ENDPOINT:
1551                                 tmp = ctrl.wIndex & 0x0f;
1552                                 /* active endpoint */
1553                                 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1554                                         goto stall;
1555                                 if (ctrl.wIndex & USB_DIR_IN) {
1556                                         if (!dev->ep[tmp].is_in)
1557                                                 goto stall;
1558                                 } else {
1559                                         if (dev->ep[tmp].is_in)
1560                                                 goto stall;
1561                                 }
1562                                 if (ctrl.wValue != USB_ENDPOINT_HALT)
1563                                         goto stall;
1564                                 if (tmp)
1565                                         goku_clear_halt(&dev->ep[tmp]);
1566 succeed:
1567                                 /* start ep0out status stage */
1568                                 writel(~(1<<0), &regs->EOP);
1569                                 dev->ep[0].stopped = 1;
1570                                 dev->ep0state = EP0_STATUS;
1571                                 return;
1572                         case USB_RECIP_DEVICE:
1573                                 /* device remote wakeup: always clear */
1574                                 if (ctrl.wValue != 1)
1575                                         goto stall;
1576                                 VDBG(dev, "clear dev remote wakeup\n");
1577                                 goto succeed;
1578                         case USB_RECIP_INTERFACE:
1579                                 goto stall;
1580                         default:                /* pass to gadget driver */
1581                                 break;
1582                         }
1583                         break;
1584                 default:
1585                         break;
1586                 }
1587         }
1588
1589 #ifdef USB_TRACE
1590         VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1591                 ctrl.bRequestType, ctrl.bRequest,
1592                 ctrl.wValue, ctrl.wIndex, ctrl.wLength);
1593 #endif
1594
1595         /* hw wants to know when we're configured (or not) */
1596         dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1597                                 && ctrl.bRequestType == USB_RECIP_DEVICE);
1598         if (unlikely(dev->req_config))
1599                 dev->configured = (ctrl.wValue != 0);
1600
1601         /* delegate everything to the gadget driver.
1602          * it may respond after this irq handler returns.
1603          */
1604         spin_unlock (&dev->lock);
1605         tmp = dev->driver->setup(&dev->gadget, &ctrl);
1606         spin_lock (&dev->lock);
1607         if (unlikely(tmp < 0)) {
1608 stall:
1609 #ifdef USB_TRACE
1610                 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1611                                 ctrl.bRequestType, ctrl.bRequest, tmp);
1612 #endif
1613                 command(regs, COMMAND_STALL, 0);
1614                 dev->ep[0].stopped = 1;
1615                 dev->ep0state = EP0_STALL;
1616         }
1617
1618         /* expect at least one data or status stage irq */
1619 }
1620
1621 #define ACK(irqbit) { \
1622                 stat &= ~irqbit; \
1623                 writel(~irqbit, &regs->int_status); \
1624                 handled = 1; \
1625                 }
1626
1627 static irqreturn_t goku_irq(int irq, void *_dev, struct pt_regs *r)
1628 {
1629         struct goku_udc                 *dev = _dev;
1630         struct goku_udc_regs __iomem    *regs = dev->regs;
1631         struct goku_ep                  *ep;
1632         u32                             stat, handled = 0;
1633         unsigned                        i, rescans = 5;
1634
1635         spin_lock(&dev->lock);
1636
1637 rescan:
1638         stat = readl(&regs->int_status) & dev->int_enable;
1639         if (!stat)
1640                 goto done;
1641         dev->irqs++;
1642
1643         /* device-wide irqs */
1644         if (unlikely(stat & INT_DEVWIDE)) {
1645                 if (stat & INT_SYSERROR) {
1646                         ERROR(dev, "system error\n");
1647                         stop_activity(dev, dev->driver);
1648                         stat = 0;
1649                         handled = 1;
1650                         // FIXME have a neater way to prevent re-enumeration
1651                         dev->driver = NULL;
1652                         goto done;
1653                 }
1654                 if (stat & INT_PWRDETECT) {
1655                         writel(~stat, &regs->int_status);
1656                         if (readl(&dev->regs->power_detect) & PW_DETECT) {
1657                                 VDBG(dev, "connect\n");
1658                                 ep0_start(dev);
1659                         } else {
1660                                 DBG(dev, "disconnect\n");
1661                                 if (dev->gadget.speed == USB_SPEED_FULL)
1662                                         stop_activity(dev, dev->driver);
1663                                 dev->ep0state = EP0_DISCONNECT;
1664                                 dev->int_enable = INT_DEVWIDE;
1665                                 writel(dev->int_enable, &dev->regs->int_enable);
1666                         }
1667                         stat = 0;
1668                         handled = 1;
1669                         goto done;
1670                 }
1671                 if (stat & INT_SUSPEND) {
1672                         ACK(INT_SUSPEND);
1673                         if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1674                                 switch (dev->ep0state) {
1675                                 case EP0_DISCONNECT:
1676                                 case EP0_SUSPEND:
1677                                         goto pm_next;
1678                                 default:
1679                                         break;
1680                                 }
1681                                 DBG(dev, "USB suspend\n");
1682                                 dev->ep0state = EP0_SUSPEND;
1683                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1684                                                 && dev->driver
1685                                                 && dev->driver->suspend) {
1686                                         spin_unlock(&dev->lock);
1687                                         dev->driver->suspend(&dev->gadget);
1688                                         spin_lock(&dev->lock);
1689                                 }
1690                         } else {
1691                                 if (dev->ep0state != EP0_SUSPEND) {
1692                                         DBG(dev, "bogus USB resume %d\n",
1693                                                 dev->ep0state);
1694                                         goto pm_next;
1695                                 }
1696                                 DBG(dev, "USB resume\n");
1697                                 dev->ep0state = EP0_IDLE;
1698                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1699                                                 && dev->driver
1700                                                 && dev->driver->resume) {
1701                                         spin_unlock(&dev->lock);
1702                                         dev->driver->resume(&dev->gadget);
1703                                         spin_lock(&dev->lock);
1704                                 }
1705                         }
1706                 }
1707 pm_next:
1708                 if (stat & INT_USBRESET) {              /* hub reset done */
1709                         ACK(INT_USBRESET);
1710                         INFO(dev, "USB reset done, gadget %s\n",
1711                                 dev->driver->driver.name);
1712                 }
1713                 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1714         }
1715
1716         /* progress ep0 setup, data, or status stages.
1717          * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1718          */
1719         if (stat & INT_SETUP) {
1720                 ACK(INT_SETUP);
1721                 dev->ep[0].irqs++;
1722                 ep0_setup(dev);
1723         }
1724         if (stat & INT_STATUSNAK) {
1725                 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1726                 if (dev->ep0state == EP0_IN) {
1727                         ep = &dev->ep[0];
1728                         ep->irqs++;
1729                         nuke(ep, 0);
1730                         writel(~(1<<0), &regs->EOP);
1731                         dev->ep0state = EP0_STATUS;
1732                 }
1733         }
1734         if (stat & INT_ENDPOINT0) {
1735                 ACK(INT_ENDPOINT0);
1736                 ep = &dev->ep[0];
1737                 ep->irqs++;
1738                 pio_advance(ep);
1739         }
1740
1741         /* dma completion */
1742         if (stat & INT_MSTRDEND) {      /* IN */
1743                 ACK(INT_MSTRDEND);
1744                 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1745                 ep->irqs++;
1746                 dma_advance(dev, ep);
1747         }
1748         if (stat & INT_MSTWREND) {      /* OUT */
1749                 ACK(INT_MSTWREND);
1750                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1751                 ep->irqs++;
1752                 dma_advance(dev, ep);
1753         }
1754         if (stat & INT_MSTWRTMOUT) {    /* OUT */
1755                 ACK(INT_MSTWRTMOUT);
1756                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1757                 ep->irqs++;
1758                 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1759                 // reset dma? then dma_advance()
1760         }
1761
1762         /* pio */
1763         for (i = 1; i < 4; i++) {
1764                 u32             tmp = INT_EPxDATASET(i);
1765
1766                 if (!(stat & tmp))
1767                         continue;
1768                 ep = &dev->ep[i];
1769                 pio_advance(ep);
1770                 if (list_empty (&ep->queue))
1771                         pio_irq_disable(dev, regs, i);
1772                 stat &= ~tmp;
1773                 handled = 1;
1774                 ep->irqs++;
1775         }
1776
1777         if (rescans--)
1778                 goto rescan;
1779
1780 done:
1781         (void)readl(&regs->int_enable);
1782         spin_unlock(&dev->lock);
1783         if (stat)
1784                 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1785                                 readl(&regs->int_status), dev->int_enable);
1786         return IRQ_RETVAL(handled);
1787 }
1788
1789 #undef ACK
1790
1791 /*-------------------------------------------------------------------------*/
1792
1793 static void gadget_release(struct device *_dev)
1794 {
1795         struct goku_udc *dev = dev_get_drvdata(_dev);
1796
1797         kfree(dev);
1798 }
1799
1800 /* tear down the binding between this driver and the pci device */
1801
1802 static void goku_remove(struct pci_dev *pdev)
1803 {
1804         struct goku_udc         *dev = pci_get_drvdata(pdev);
1805
1806         DBG(dev, "%s\n", __FUNCTION__);
1807         /* start with the driver above us */
1808         if (dev->driver) {
1809                 /* should have been done already by driver model core */
1810                 WARN(dev, "pci remove, driver '%s' is still registered\n",
1811                                 dev->driver->driver.name);
1812                 usb_gadget_unregister_driver(dev->driver);
1813         }
1814
1815 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1816         remove_proc_entry(proc_node_name, NULL);
1817 #endif
1818         if (dev->regs)
1819                 udc_reset(dev);
1820         if (dev->got_irq)
1821                 free_irq(pdev->irq, dev);
1822         if (dev->regs)
1823                 iounmap(dev->regs);
1824         if (dev->got_region)
1825                 release_mem_region(pci_resource_start (pdev, 0),
1826                                 pci_resource_len (pdev, 0));
1827         if (dev->enabled)
1828                 pci_disable_device(pdev);
1829         device_unregister(&dev->gadget.dev);
1830
1831         pci_set_drvdata(pdev, NULL);
1832         dev->regs = NULL;
1833         the_controller = NULL;
1834
1835         INFO(dev, "unbind\n");
1836 }
1837
1838 /* wrap this driver around the specified pci device, but
1839  * don't respond over USB until a gadget driver binds to us.
1840  */
1841
1842 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1843 {
1844         struct goku_udc         *dev = NULL;
1845         unsigned long           resource, len;
1846         void __iomem            *base = NULL;
1847         int                     retval;
1848         char                    buf [8], *bufp;
1849
1850         /* if you want to support more than one controller in a system,
1851          * usb_gadget_driver_{register,unregister}() must change.
1852          */
1853         if (the_controller) {
1854                 WARN(dev, "ignoring %s\n", pci_name(pdev));
1855                 return -EBUSY;
1856         }
1857         if (!pdev->irq) {
1858                 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1859                 retval = -ENODEV;
1860                 goto done;
1861         }
1862
1863         /* alloc, and start init */
1864         dev = kmalloc (sizeof *dev, SLAB_KERNEL);
1865         if (dev == NULL){
1866                 pr_debug("enomem %s\n", pci_name(pdev));
1867                 retval = -ENOMEM;
1868                 goto done;
1869         }
1870
1871         memset(dev, 0, sizeof *dev);
1872         spin_lock_init(&dev->lock);
1873         dev->pdev = pdev;
1874         dev->gadget.ops = &goku_ops;
1875
1876         /* the "gadget" abstracts/virtualizes the controller */
1877         strcpy(dev->gadget.dev.bus_id, "gadget");
1878         dev->gadget.dev.parent = &pdev->dev;
1879         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1880         dev->gadget.dev.release = gadget_release;
1881         dev->gadget.name = driver_name;
1882
1883         /* now all the pci goodies ... */
1884         retval = pci_enable_device(pdev);
1885         if (retval < 0) {
1886                 DBG(dev, "can't enable, %d\n", retval);
1887                 goto done;
1888         }
1889         dev->enabled = 1;
1890
1891         resource = pci_resource_start(pdev, 0);
1892         len = pci_resource_len(pdev, 0);
1893         if (!request_mem_region(resource, len, driver_name)) {
1894                 DBG(dev, "controller already in use\n");
1895                 retval = -EBUSY;
1896                 goto done;
1897         }
1898         dev->got_region = 1;
1899
1900         base = ioremap_nocache(resource, len);
1901         if (base == NULL) {
1902                 DBG(dev, "can't map memory\n");
1903                 retval = -EFAULT;
1904                 goto done;
1905         }
1906         dev->regs = (struct goku_udc_regs __iomem *) base;
1907
1908         pci_set_drvdata(pdev, dev);
1909         INFO(dev, "%s\n", driver_desc);
1910         INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1911 #ifndef __sparc__
1912         scnprintf(buf, sizeof buf, "%d", pdev->irq);
1913         bufp = buf;
1914 #else
1915         bufp = __irq_itoa(pdev->irq);
1916 #endif
1917         INFO(dev, "irq %s, pci mem %p\n", bufp, base);
1918
1919         /* init to known state, then setup irqs */
1920         udc_reset(dev);
1921         udc_reinit (dev);
1922         if (request_irq(pdev->irq, goku_irq, SA_SHIRQ/*|SA_SAMPLE_RANDOM*/,
1923                         driver_name, dev) != 0) {
1924                 DBG(dev, "request interrupt %s failed\n", bufp);
1925                 retval = -EBUSY;
1926                 goto done;
1927         }
1928         dev->got_irq = 1;
1929         if (use_dma)
1930                 pci_set_master(pdev);
1931
1932
1933 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1934         create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1935 #endif
1936
1937         /* done */
1938         the_controller = dev;
1939         device_register(&dev->gadget.dev);
1940
1941         return 0;
1942
1943 done:
1944         if (dev)
1945                 goku_remove (pdev);
1946         return retval;
1947 }
1948
1949
1950 /*-------------------------------------------------------------------------*/
1951
1952 static struct pci_device_id pci_ids [] = { {
1953         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1954         .class_mask =   ~0,
1955         .vendor =       0x102f,         /* Toshiba */
1956         .device =       0x0107,         /* this UDC */
1957         .subvendor =    PCI_ANY_ID,
1958         .subdevice =    PCI_ANY_ID,
1959
1960 }, { /* end: all zeroes */ }
1961 };
1962 MODULE_DEVICE_TABLE (pci, pci_ids);
1963
1964 static struct pci_driver goku_pci_driver = {
1965         .name =         (char *) driver_name,
1966         .id_table =     pci_ids,
1967
1968         .probe =        goku_probe,
1969         .remove =       goku_remove,
1970
1971         /* FIXME add power management support */
1972 };
1973
1974 static int __init init (void)
1975 {
1976         return pci_register_driver (&goku_pci_driver);
1977 }
1978 module_init (init);
1979
1980 static void __exit cleanup (void)
1981 {
1982         pci_unregister_driver (&goku_pci_driver);
1983 }
1984 module_exit (cleanup);