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 be 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, gfp_t gfp_flags)
 273 {
 274         struct goku_request     *req;
 275
 276         if (!_ep)
 277                 return NULL;
 278         req = kzalloc(sizeof *req, gfp_flags);
 279         if (!req)
 280                 return NULL;
 281
 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_DMA_NONCOHERENT)
 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, gfp_t 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 NULL;
 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                 /* the main problem with this call is that it wastes memory
 346                  * on typical 1/N page allocations: it allocates 1-N pages.
 347                  */
 348 #warning Using dma_alloc_coherent even with buffers smaller than a page.
 349                 retval = dma_alloc_coherent(&ep->dev->pdev->dev,
 350                                 bytes, dma, gfp_flags);
 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                 dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma);
 369         } else
 370 #endif
 371                 kfree (buf);
 372 }
 373
 374 /*-------------------------------------------------------------------------*/
 375
 376 static void
 377 done(struct goku_ep *ep, struct goku_request *req, int status)
 378 {
 379         struct goku_udc         *dev;
 380         unsigned                stopped = ep->stopped;
 381
 382         list_del_init(&req->queue);
 383
 384         if (likely(req->req.status == -EINPROGRESS))
 385                 req->req.status = status;
 386         else
 387                 status = req->req.status;
 388
 389         dev = ep->dev;
 390         if (req->mapped) {
 391                 pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
 392                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 393                 req->req.dma = DMA_ADDR_INVALID;
 394                 req->mapped = 0;
 395         }
 396
 397 #ifndef USB_TRACE
 398         if (status && status != -ESHUTDOWN)
 399 #endif
 400                 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
 401                         ep->ep.name, &req->req, status,
 402                         req->req.actual, req->req.length);
 403
 404         /* don't modify queue heads during completion callback */
 405         ep->stopped = 1;
 406         spin_unlock(&dev->lock);
 407         req->req.complete(&ep->ep, &req->req);
 408         spin_lock(&dev->lock);
 409         ep->stopped = stopped;
 410 }
 411
 412 /*-------------------------------------------------------------------------*/
 413
 414 static inline int
 415 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
 416 {
 417         unsigned        length, count;
 418
 419         length = min(req->req.length - req->req.actual, max);
 420         req->req.actual += length;
 421
 422         count = length;
 423         while (likely(count--))
 424                 writel(*buf++, fifo);
 425         return length;
 426 }
 427
 428 // return:  0 = still running, 1 = completed, negative = errno
 429 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
 430 {
 431         struct goku_udc *dev = ep->dev;
 432         u32             tmp;
 433         u8              *buf;
 434         unsigned        count;
 435         int             is_last;
 436
 437         tmp = readl(&dev->regs->DataSet);
 438         buf = req->req.buf + req->req.actual;
 439         prefetch(buf);
 440
 441         dev = ep->dev;
 442         if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
 443                 return -EL2HLT;
 444
 445         /* NOTE:  just single-buffered PIO-IN for now.  */
 446         if (unlikely((tmp & DATASET_A(ep->num)) != 0))
 447                 return 0;
 448
 449         /* clear our "packet available" irq */
 450         if (ep->num != 0)
 451                 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
 452
 453         count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
 454
 455         /* last packet often short (sometimes a zlp, especially on ep0) */
 456         if (unlikely(count != ep->ep.maxpacket)) {
 457                 writel(~(1<<ep->num), &dev->regs->EOP);
 458                 if (ep->num == 0) {
 459                         dev->ep[0].stopped = 1;
 460                         dev->ep0state = EP0_STATUS;
 461                 }
 462                 is_last = 1;
 463         } else {
 464                 if (likely(req->req.length != req->req.actual)
 465                                 || req->req.zero)
 466                         is_last = 0;
 467                 else
 468                         is_last = 1;
 469         }
 470 #if 0           /* printk seemed to trash is_last...*/
 471 //#ifdef USB_TRACE
 472         VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
 473                 ep->ep.name, count, is_last ? "/last" : "",
 474                 req->req.length - req->req.actual, req);
 475 #endif
 476
 477         /* requests complete when all IN data is in the FIFO,
 478          * or sometimes later, if a zlp was needed.
 479          */
 480         if (is_last) {
 481                 done(ep, req, 0);
 482                 return 1;
 483         }
 484
 485         return 0;
 486 }
 487
 488 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
 489 {
 490         struct goku_udc_regs __iomem    *regs;
 491         u32                             size, set;
 492         u8                              *buf;
 493         unsigned                        bufferspace, is_short, dbuff;
 494
 495         regs = ep->dev->regs;
 496 top:
 497         buf = req->req.buf + req->req.actual;
 498         prefetchw(buf);
 499
 500         if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
 501                 return -EL2HLT;
 502
 503         dbuff = (ep->num == 1 || ep->num == 2);
 504         do {
 505                 /* ack dataset irq matching the status we'll handle */
 506                 if (ep->num != 0)
 507                         writel(~INT_EPxDATASET(ep->num), &regs->int_status);
 508
 509                 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
 510                 size = readl(&regs->EPxSizeLA[ep->num]);
 511                 bufferspace = req->req.length - req->req.actual;
 512
 513                 /* usually do nothing without an OUT packet */
 514                 if (likely(ep->num != 0 || bufferspace != 0)) {
 515                         if (unlikely(set == 0))
 516                                 break;
 517                         /* use ep1/ep2 double-buffering for OUT */
 518                         if (!(size & PACKET_ACTIVE))
 519                                 size = readl(&regs->EPxSizeLB[ep->num]);
 520                         if (!(size & PACKET_ACTIVE))    // "can't happen"
 521                                 break;
 522                         size &= DATASIZE;       /* EPxSizeH == 0 */
 523
 524                 /* ep0out no-out-data case for set_config, etc */
 525                 } else
 526                         size = 0;
 527
 528                 /* read all bytes from this packet */
 529                 req->req.actual += size;
 530                 is_short = (size < ep->ep.maxpacket);
 531 #ifdef USB_TRACE
 532                 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
 533                         ep->ep.name, size, is_short ? "/S" : "",
 534                         req, req->req.actual, req->req.length);
 535 #endif
 536                 while (likely(size-- != 0)) {
 537                         u8      byte = (u8) readl(ep->reg_fifo);
 538
 539                         if (unlikely(bufferspace == 0)) {
 540                                 /* this happens when the driver's buffer
 541                                  * is smaller than what the host sent.
 542                                  * discard the extra data in this packet.
 543                                  */
 544                                 if (req->req.status != -EOVERFLOW)
 545                                         DBG(ep->dev, "%s overflow %u\n",
 546                                                 ep->ep.name, size);
 547                                 req->req.status = -EOVERFLOW;
 548                         } else {
 549                                 *buf++ = byte;
 550                                 bufferspace--;
 551                         }
 552                 }
 553
 554                 /* completion */
 555                 if (unlikely(is_short || req->req.actual == req->req.length)) {
 556                         if (unlikely(ep->num == 0)) {
 557                                 /* non-control endpoints now usable? */
 558                                 if (ep->dev->req_config)
 559                                         writel(ep->dev->configured
 560                                                         ? USBSTATE_CONFIGURED
 561                                                         : 0,
 562                                                 &regs->UsbState);
 563                                 /* ep0out status stage */
 564                                 writel(~(1<<0), &regs->EOP);
 565                                 ep->stopped = 1;
 566                                 ep->dev->ep0state = EP0_STATUS;
 567                         }
 568                         done(ep, req, 0);
 569
 570                         /* empty the second buffer asap */
 571                         if (dbuff && !list_empty(&ep->queue)) {
 572                                 req = list_entry(ep->queue.next,
 573                                                 struct goku_request, queue);
 574                                 goto top;
 575                         }
 576                         return 1;
 577                 }
 578         } while (dbuff);
 579         return 0;
 580 }
 581
 582 static inline void
 583 pio_irq_enable(struct goku_udc *dev,
 584                 struct goku_udc_regs __iomem *regs, int epnum)
 585 {
 586         dev->int_enable |= INT_EPxDATASET (epnum);
 587         writel(dev->int_enable, &regs->int_enable);
 588         /* write may still be posted */
 589 }
 590
 591 static inline void
 592 pio_irq_disable(struct goku_udc *dev,
 593                 struct goku_udc_regs __iomem *regs, int epnum)
 594 {
 595         dev->int_enable &= ~INT_EPxDATASET (epnum);
 596         writel(dev->int_enable, &regs->int_enable);
 597         /* write may still be posted */
 598 }
 599
 600 static inline void
 601 pio_advance(struct goku_ep *ep)
 602 {
 603         struct goku_request     *req;
 604
 605         if (unlikely(list_empty (&ep->queue)))
 606                 return;
 607         req = list_entry(ep->queue.next, struct goku_request, queue);
 608         (ep->is_in ? write_fifo : read_fifo)(ep, req);
 609 }
 610
 611
 612 /*-------------------------------------------------------------------------*/
 613
 614 // return:  0 = q running, 1 = q stopped, negative = errno
 615 static int start_dma(struct goku_ep *ep, struct goku_request *req)
 616 {
 617         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 618         u32                             master;
 619         u32                             start = req->req.dma;
 620         u32                             end = start + req->req.length - 1;
 621
 622         master = readl(&regs->dma_master) & MST_RW_BITS;
 623
 624         /* re-init the bits affecting IN dma; careful with zlps */
 625         if (likely(ep->is_in)) {
 626                 if (unlikely(master & MST_RD_ENA)) {
 627                         DBG (ep->dev, "start, IN active dma %03x!!\n",
 628                                 master);
 629 //                      return -EL2HLT;
 630                 }
 631                 writel(end, &regs->in_dma_end);
 632                 writel(start, &regs->in_dma_start);
 633
 634                 master &= ~MST_R_BITS;
 635                 if (unlikely(req->req.length == 0))
 636                         master = MST_RD_ENA | MST_RD_EOPB;
 637                 else if ((req->req.length % ep->ep.maxpacket) != 0
 638                                         || req->req.zero)
 639                         master = MST_RD_ENA | MST_EOPB_ENA;
 640                 else
 641                         master = MST_RD_ENA | MST_EOPB_DIS;
 642
 643                 ep->dev->int_enable |= INT_MSTRDEND;
 644
 645         /* Goku DMA-OUT merges short packets, which plays poorly with
 646          * protocols where short packets mark the transfer boundaries.
 647          * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
 648          * ending transfers after 3 SOFs; we don't turn it on.
 649          */
 650         } else {
 651                 if (unlikely(master & MST_WR_ENA)) {
 652                         DBG (ep->dev, "start, OUT active dma %03x!!\n",
 653                                 master);
 654 //                      return -EL2HLT;
 655                 }
 656                 writel(end, &regs->out_dma_end);
 657                 writel(start, &regs->out_dma_start);
 658
 659                 master &= ~MST_W_BITS;
 660                 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
 661
 662                 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
 663         }
 664
 665         writel(master, &regs->dma_master);
 666         writel(ep->dev->int_enable, &regs->int_enable);
 667         return 0;
 668 }
 669
 670 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
 671 {
 672         struct goku_request             *req;
 673         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 674         u32                             master;
 675
 676         master = readl(&regs->dma_master);
 677
 678         if (unlikely(list_empty(&ep->queue))) {
 679 stop:
 680                 if (ep->is_in)
 681                         dev->int_enable &= ~INT_MSTRDEND;
 682                 else
 683                         dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
 684                 writel(dev->int_enable, &regs->int_enable);
 685                 return;
 686         }
 687         req = list_entry(ep->queue.next, struct goku_request, queue);
 688
 689         /* normal hw dma completion (not abort) */
 690         if (likely(ep->is_in)) {
 691                 if (unlikely(master & MST_RD_ENA))
 692                         return;
 693                 req->req.actual = readl(&regs->in_dma_current);
 694         } else {
 695                 if (unlikely(master & MST_WR_ENA))
 696                         return;
 697
 698                 /* hardware merges short packets, and also hides packet
 699                  * overruns.  a partial packet MAY be in the fifo here.
 700                  */
 701                 req->req.actual = readl(&regs->out_dma_current);
 702         }
 703         req->req.actual -= req->req.dma;
 704         req->req.actual++;
 705
 706 #ifdef USB_TRACE
 707         VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
 708                 ep->ep.name, ep->is_in ? "IN" : "OUT",
 709                 req->req.actual, req->req.length, req);
 710 #endif
 711         done(ep, req, 0);
 712         if (list_empty(&ep->queue))
 713                 goto stop;
 714         req = list_entry(ep->queue.next, struct goku_request, queue);
 715         (void) start_dma(ep, req);
 716 }
 717
 718 static void abort_dma(struct goku_ep *ep, int status)
 719 {
 720         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 721         struct goku_request             *req;
 722         u32                             curr, master;
 723
 724         /* NAK future host requests, hoping the implicit delay lets the
 725          * dma engine finish reading (or writing) its latest packet and
 726          * empty the dma buffer (up to 16 bytes).
 727          *
 728          * This avoids needing to clean up a partial packet in the fifo;
 729          * we can't do that for IN without side effects to HALT and TOGGLE.
 730          */
 731         command(regs, COMMAND_FIFO_DISABLE, ep->num);
 732         req = list_entry(ep->queue.next, struct goku_request, queue);
 733         master = readl(&regs->dma_master) & MST_RW_BITS;
 734
 735         /* FIXME using these resets isn't usably documented. this may
 736          * not work unless it's followed by disabling the endpoint.
 737          *
 738          * FIXME the OUT reset path doesn't even behave consistently.
 739          */
 740         if (ep->is_in) {
 741                 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
 742                         goto finished;
 743                 curr = readl(&regs->in_dma_current);
 744
 745                 writel(curr, &regs->in_dma_end);
 746                 writel(curr, &regs->in_dma_start);
 747
 748                 master &= ~MST_R_BITS;
 749                 master |= MST_RD_RESET;
 750                 writel(master, &regs->dma_master);
 751
 752                 if (readl(&regs->dma_master) & MST_RD_ENA)
 753                         DBG(ep->dev, "IN dma active after reset!\n");
 754
 755         } else {
 756                 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
 757                         goto finished;
 758                 curr = readl(&regs->out_dma_current);
 759
 760                 writel(curr, &regs->out_dma_end);
 761                 writel(curr, &regs->out_dma_start);
 762
 763                 master &= ~MST_W_BITS;
 764                 master |= MST_WR_RESET;
 765                 writel(master, &regs->dma_master);
 766
 767                 if (readl(&regs->dma_master) & MST_WR_ENA)
 768                         DBG(ep->dev, "OUT dma active after reset!\n");
 769         }
 770         req->req.actual = (curr - req->req.dma) + 1;
 771         req->req.status = status;
 772
 773         VDBG(ep->dev, "%s %s %s %d/%d\n", __FUNCTION__, ep->ep.name,
 774                 ep->is_in ? "IN" : "OUT",
 775                 req->req.actual, req->req.length);
 776
 777         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 778
 779         return;
 780
 781 finished:
 782         /* dma already completed; no abort needed */
 783         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 784         req->req.actual = req->req.length;
 785         req->req.status = 0;
 786 }
 787
 788 /*-------------------------------------------------------------------------*/
 789
 790 static int
 791 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 792 {
 793         struct goku_request     *req;
 794         struct goku_ep          *ep;
 795         struct goku_udc         *dev;
 796         unsigned long           flags;
 797         int                     status;
 798
 799         /* always require a cpu-view buffer so pio works */
 800         req = container_of(_req, struct goku_request, req);
 801         if (unlikely(!_req || !_req->complete
 802                         || !_req->buf || !list_empty(&req->queue)))
 803                 return -EINVAL;
 804         ep = container_of(_ep, struct goku_ep, ep);
 805         if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
 806                 return -EINVAL;
 807         dev = ep->dev;
 808         if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
 809                 return -ESHUTDOWN;
 810
 811         /* can't touch registers when suspended */
 812         if (dev->ep0state == EP0_SUSPEND)
 813                 return -EBUSY;
 814
 815         /* set up dma mapping in case the caller didn't */
 816         if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
 817                 _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
 818                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 819                 req->mapped = 1;
 820         }
 821
 822 #ifdef USB_TRACE
 823         VDBG(dev, "%s queue req %p, len %u buf %p\n",
 824                         _ep->name, _req, _req->length, _req->buf);
 825 #endif
 826
 827         spin_lock_irqsave(&dev->lock, flags);
 828
 829         _req->status = -EINPROGRESS;
 830         _req->actual = 0;
 831
 832         /* for ep0 IN without premature status, zlp is required and
 833          * writing EOP starts the status stage (OUT).
 834          */
 835         if (unlikely(ep->num == 0 && ep->is_in))
 836                 _req->zero = 1;
 837
 838         /* kickstart this i/o queue? */
 839         status = 0;
 840         if (list_empty(&ep->queue) && likely(!ep->stopped)) {
 841                 /* dma:  done after dma completion IRQ (or error)
 842                  * pio:  done after last fifo operation
 843                  */
 844                 if (ep->dma)
 845                         status = start_dma(ep, req);
 846                 else
 847                         status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
 848
 849                 if (unlikely(status != 0)) {
 850                         if (status > 0)
 851                                 status = 0;
 852                         req = NULL;
 853                 }
 854
 855         } /* else pio or dma irq handler advances the queue. */
 856
 857         if (likely(req != 0))
 858                 list_add_tail(&req->queue, &ep->queue);
 859
 860         if (likely(!list_empty(&ep->queue))
 861                         && likely(ep->num != 0)
 862                         && !ep->dma
 863                         && !(dev->int_enable & INT_EPxDATASET (ep->num)))
 864                 pio_irq_enable(dev, dev->regs, ep->num);
 865
 866         spin_unlock_irqrestore(&dev->lock, flags);
 867
 868         /* pci writes may still be posted */
 869         return status;
 870 }
 871
 872 /* dequeue ALL requests */
 873 static void nuke(struct goku_ep *ep, int status)
 874 {
 875         struct goku_request     *req;
 876
 877         ep->stopped = 1;
 878         if (list_empty(&ep->queue))
 879                 return;
 880         if (ep->dma)
 881                 abort_dma(ep, status);
 882         while (!list_empty(&ep->queue)) {
 883                 req = list_entry(ep->queue.next, struct goku_request, queue);
 884                 done(ep, req, status);
 885         }
 886 }
 887
 888 /* dequeue JUST ONE request */
 889 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 890 {
 891         struct goku_request     *req;
 892         struct goku_ep          *ep;
 893         struct goku_udc         *dev;
 894         unsigned long           flags;
 895
 896         ep = container_of(_ep, struct goku_ep, ep);
 897         if (!_ep || !_req || (!ep->desc && ep->num != 0))
 898                 return -EINVAL;
 899         dev = ep->dev;
 900         if (!dev->driver)
 901                 return -ESHUTDOWN;
 902
 903         /* we can't touch (dma) registers when suspended */
 904         if (dev->ep0state == EP0_SUSPEND)
 905                 return -EBUSY;
 906
 907         VDBG(dev, "%s %s %s %s %p\n", __FUNCTION__, _ep->name,
 908                 ep->is_in ? "IN" : "OUT",
 909                 ep->dma ? "dma" : "pio",
 910                 _req);
 911
 912         spin_lock_irqsave(&dev->lock, flags);
 913
 914         /* make sure it's actually queued on this endpoint */
 915         list_for_each_entry (req, &ep->queue, queue) {
 916                 if (&req->req == _req)
 917                         break;
 918         }
 919         if (&req->req != _req) {
 920                 spin_unlock_irqrestore (&dev->lock, flags);
 921                 return -EINVAL;
 922         }
 923
 924         if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
 925                 abort_dma(ep, -ECONNRESET);
 926                 done(ep, req, -ECONNRESET);
 927                 dma_advance(dev, ep);
 928         } else if (!list_empty(&req->queue))
 929                 done(ep, req, -ECONNRESET);
 930         else
 931                 req = NULL;
 932         spin_unlock_irqrestore(&dev->lock, flags);
 933
 934         return req ? 0 : -EOPNOTSUPP;
 935 }
 936
 937 /*-------------------------------------------------------------------------*/
 938
 939 static void goku_clear_halt(struct goku_ep *ep)
 940 {
 941         // assert (ep->num !=0)
 942         VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
 943         command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
 944         command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
 945         if (ep->stopped) {
 946                 ep->stopped = 0;
 947                 if (ep->dma) {
 948                         struct goku_request     *req;
 949
 950                         if (list_empty(&ep->queue))
 951                                 return;
 952                         req = list_entry(ep->queue.next, struct goku_request,
 953                                                 queue);
 954                         (void) start_dma(ep, req);
 955                 } else
 956                         pio_advance(ep);
 957         }
 958 }
 959
 960 static int goku_set_halt(struct usb_ep *_ep, int value)
 961 {
 962         struct goku_ep  *ep;
 963         unsigned long   flags;
 964         int             retval = 0;
 965
 966         if (!_ep)
 967                 return -ENODEV;
 968         ep = container_of (_ep, struct goku_ep, ep);
 969
 970         if (ep->num == 0) {
 971                 if (value) {
 972                         ep->dev->ep0state = EP0_STALL;
 973                         ep->dev->ep[0].stopped = 1;
 974                 } else
 975                         return -EINVAL;
 976
 977         /* don't change EPxSTATUS_EP_INVALID to READY */
 978         } else if (!ep->desc) {
 979                 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
 980                 return -EINVAL;
 981         }
 982
 983         spin_lock_irqsave(&ep->dev->lock, flags);
 984         if (!list_empty(&ep->queue))
 985                 retval = -EAGAIN;
 986         else if (ep->is_in && value
 987                         /* data in (either) packet buffer? */
 988                         && (readl(&ep->dev->regs->DataSet)
 989                                         & 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 __iomem    *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 __iomem    *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 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1098
1099 static const char proc_node_name [] = "driver/udc";
1100
1101 #define FOURBITS "%s%s%s%s"
1102 #define EIGHTBITS FOURBITS FOURBITS
1103
1104 static void
1105 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1106 {
1107         int t;
1108
1109         /* int_status is the same format ... */
1110         t = scnprintf(*next, *size,
1111                 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1112                 label, mask,
1113                 (mask & INT_PWRDETECT) ? " power" : "",
1114                 (mask & INT_SYSERROR) ? " sys" : "",
1115                 (mask & INT_MSTRDEND) ? " in-dma" : "",
1116                 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1117
1118                 (mask & INT_MSTWREND) ? " out-dma" : "",
1119                 (mask & INT_MSTWRSET) ? " wrset" : "",
1120                 (mask & INT_ERR) ? " err" : "",
1121                 (mask & INT_SOF) ? " sof" : "",
1122
1123                 (mask & INT_EP3NAK) ? " ep3nak" : "",
1124                 (mask & INT_EP2NAK) ? " ep2nak" : "",
1125                 (mask & INT_EP1NAK) ? " ep1nak" : "",
1126                 (mask & INT_EP3DATASET) ? " ep3" : "",
1127
1128                 (mask & INT_EP2DATASET) ? " ep2" : "",
1129                 (mask & INT_EP1DATASET) ? " ep1" : "",
1130                 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1131                 (mask & INT_STATUS) ? " ep0status" : "",
1132
1133                 (mask & INT_SETUP) ? " setup" : "",
1134                 (mask & INT_ENDPOINT0) ? " ep0" : "",
1135                 (mask & INT_USBRESET) ? " reset" : "",
1136                 (mask & INT_SUSPEND) ? " suspend" : "");
1137         *size -= t;
1138         *next += t;
1139 }
1140
1141
1142 static int
1143 udc_proc_read(char *buffer, char **start, off_t off, int count,
1144                 int *eof, void *_dev)
1145 {
1146         char                            *buf = buffer;
1147         struct goku_udc                 *dev = _dev;
1148         struct goku_udc_regs __iomem    *regs = dev->regs;
1149         char                            *next = buf;
1150         unsigned                        size = count;
1151         unsigned long                   flags;
1152         int                             i, t, is_usb_connected;
1153         u32                             tmp;
1154
1155         if (off != 0)
1156                 return 0;
1157
1158         local_irq_save(flags);
1159
1160         /* basic device status */
1161         tmp = readl(&regs->power_detect);
1162         is_usb_connected = tmp & PW_DETECT;
1163         t = scnprintf(next, size,
1164                 "%s - %s\n"
1165                 "%s version: %s %s\n"
1166                 "Gadget driver: %s\n"
1167                 "Host %s, %s\n"
1168                 "\n",
1169                 pci_name(dev->pdev), driver_desc,
1170                 driver_name, DRIVER_VERSION, dmastr(),
1171                 dev->driver ? dev->driver->driver.name : "(none)",
1172                 is_usb_connected
1173                         ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1174                         : "disconnected",
1175                 ({char *tmp;
1176                 switch(dev->ep0state){
1177                 case EP0_DISCONNECT:    tmp = "ep0_disconnect"; break;
1178                 case EP0_IDLE:          tmp = "ep0_idle"; break;
1179                 case EP0_IN:            tmp = "ep0_in"; break;
1180                 case EP0_OUT:           tmp = "ep0_out"; break;
1181                 case EP0_STATUS:        tmp = "ep0_status"; break;
1182                 case EP0_STALL:         tmp = "ep0_stall"; break;
1183                 case EP0_SUSPEND:       tmp = "ep0_suspend"; break;
1184                 default:                tmp = "ep0_?"; break;
1185                 } tmp; })
1186                 );
1187         size -= t;
1188         next += t;
1189
1190         dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1191         dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1192
1193         if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1194                 goto done;
1195
1196         /* registers for (active) device and ep0 */
1197         t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1198                         "single.bcs %02x.%02x state %x addr %u\n",
1199                         dev->irqs, readl(&regs->DataSet),
1200                         readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1201                         readl(&regs->UsbState),
1202                         readl(&regs->address));
1203         size -= t;
1204         next += t;
1205
1206         tmp = readl(&regs->dma_master);
1207         t = scnprintf(next, size,
1208                 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1209                 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1210                 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1211                 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1212                 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1213
1214                 (tmp & MST_RD_EOPB) ? " eopb" : "",
1215                 (tmp & MST_RD_RESET) ? " in_reset" : "",
1216                 (tmp & MST_WR_RESET) ? " out_reset" : "",
1217                 (tmp & MST_RD_ENA) ? " IN" : "",
1218
1219                 (tmp & MST_WR_ENA) ? " OUT" : "",
1220                 (tmp & MST_CONNECTION)
1221                         ? "ep1in/ep2out"
1222                         : "ep1out/ep2in");
1223         size -= t;
1224         next += t;
1225
1226         /* dump endpoint queues */
1227         for (i = 0; i < 4; i++) {
1228                 struct goku_ep          *ep = &dev->ep [i];
1229                 struct goku_request     *req;
1230                 int                     t;
1231
1232                 if (i && !ep->desc)
1233                         continue;
1234
1235                 tmp = readl(ep->reg_status);
1236                 t = scnprintf(next, size,
1237                         "%s %s max %u %s, irqs %lu, "
1238                         "status %02x (%s) " FOURBITS "\n",
1239                         ep->ep.name,
1240                         ep->is_in ? "in" : "out",
1241                         ep->ep.maxpacket,
1242                         ep->dma ? "dma" : "pio",
1243                         ep->irqs,
1244                         tmp, ({ char *s;
1245                         switch (tmp & EPxSTATUS_EP_MASK) {
1246                         case EPxSTATUS_EP_READY:
1247                                 s = "ready"; break;
1248                         case EPxSTATUS_EP_DATAIN:
1249                                 s = "packet"; break;
1250                         case EPxSTATUS_EP_FULL:
1251                                 s = "full"; break;
1252                         case EPxSTATUS_EP_TX_ERR:       // host will retry
1253                                 s = "tx_err"; break;
1254                         case EPxSTATUS_EP_RX_ERR:
1255                                 s = "rx_err"; break;
1256                         case EPxSTATUS_EP_BUSY:         /* ep0 only */
1257                                 s = "busy"; break;
1258                         case EPxSTATUS_EP_STALL:
1259                                 s = "stall"; break;
1260                         case EPxSTATUS_EP_INVALID:      // these "can't happen"
1261                                 s = "invalid"; break;
1262                         default:
1263                                 s = "?"; break;
1264                         }; s; }),
1265                         (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1266                         (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1267                         (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1268                         (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1269                         );
1270                 if (t <= 0 || t > size)
1271                         goto done;
1272                 size -= t;
1273                 next += t;
1274
1275                 if (list_empty(&ep->queue)) {
1276                         t = scnprintf(next, size, "\t(nothing queued)\n");
1277                         if (t <= 0 || t > size)
1278                                 goto done;
1279                         size -= t;
1280                         next += t;
1281                         continue;
1282                 }
1283                 list_for_each_entry(req, &ep->queue, queue) {
1284                         if (ep->dma && req->queue.prev == &ep->queue) {
1285                                 if (i == UDC_MSTRD_ENDPOINT)
1286                                         tmp = readl(&regs->in_dma_current);
1287                                 else
1288                                         tmp = readl(&regs->out_dma_current);
1289                                 tmp -= req->req.dma;
1290                                 tmp++;
1291                         } else
1292                                 tmp = req->req.actual;
1293
1294                         t = scnprintf(next, size,
1295                                 "\treq %p len %u/%u buf %p\n",
1296                                 &req->req, tmp, req->req.length,
1297                                 req->req.buf);
1298                         if (t <= 0 || t > size)
1299                                 goto done;
1300                         size -= t;
1301                         next += t;
1302                 }
1303         }
1304
1305 done:
1306         local_irq_restore(flags);
1307         *eof = 1;
1308         return count - size;
1309 }
1310
1311 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1312
1313 /*-------------------------------------------------------------------------*/
1314
1315 static void udc_reinit (struct goku_udc *dev)
1316 {
1317         static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1318
1319         unsigned i;
1320
1321         INIT_LIST_HEAD (&dev->gadget.ep_list);
1322         dev->gadget.ep0 = &dev->ep [0].ep;
1323         dev->gadget.speed = USB_SPEED_UNKNOWN;
1324         dev->ep0state = EP0_DISCONNECT;
1325         dev->irqs = 0;
1326
1327         for (i = 0; i < 4; i++) {
1328                 struct goku_ep  *ep = &dev->ep[i];
1329
1330                 ep->num = i;
1331                 ep->ep.name = names[i];
1332                 ep->reg_fifo = &dev->regs->ep_fifo [i];
1333                 ep->reg_status = &dev->regs->ep_status [i];
1334                 ep->reg_mode = &dev->regs->ep_mode[i];
1335
1336                 ep->ep.ops = &goku_ep_ops;
1337                 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1338                 ep->dev = dev;
1339                 INIT_LIST_HEAD (&ep->queue);
1340
1341                 ep_reset(NULL, ep);
1342         }
1343
1344         dev->ep[0].reg_mode = NULL;
1345         dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1346         list_del_init (&dev->ep[0].ep.ep_list);
1347 }
1348
1349 static void udc_reset(struct goku_udc *dev)
1350 {
1351         struct goku_udc_regs __iomem    *regs = dev->regs;
1352
1353         writel(0, &regs->power_detect);
1354         writel(0, &regs->int_enable);
1355         readl(&regs->int_enable);
1356         dev->int_enable = 0;
1357
1358         /* deassert reset, leave USB D+ at hi-Z (no pullup)
1359          * don't let INT_PWRDETECT sequence begin
1360          */
1361         udelay(250);
1362         writel(PW_RESETB, &regs->power_detect);
1363         readl(&regs->int_enable);
1364 }
1365
1366 static void ep0_start(struct goku_udc *dev)
1367 {
1368         struct goku_udc_regs __iomem    *regs = dev->regs;
1369         unsigned                        i;
1370
1371         VDBG(dev, "%s\n", __FUNCTION__);
1372
1373         udc_reset(dev);
1374         udc_reinit (dev);
1375         //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1376
1377         /* hw handles set_address, set_feature, get_status; maybe more */
1378         writel(   G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1379                 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1380                 | G_REQMODE_GET_DESC
1381                 | G_REQMODE_CLEAR_FEAT
1382                 , &regs->reqmode);
1383
1384         for (i = 0; i < 4; i++)
1385                 dev->ep[i].irqs = 0;
1386
1387         /* can't modify descriptors after writing UsbReady */
1388         for (i = 0; i < DESC_LEN; i++)
1389                 writel(0, &regs->descriptors[i]);
1390         writel(0, &regs->UsbReady);
1391
1392         /* expect ep0 requests when the host drops reset */
1393         writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1394         dev->int_enable = INT_DEVWIDE | INT_EP0;
1395         writel(dev->int_enable, &dev->regs->int_enable);
1396         readl(&regs->int_enable);
1397         dev->gadget.speed = USB_SPEED_FULL;
1398         dev->ep0state = EP0_IDLE;
1399 }
1400
1401 static void udc_enable(struct goku_udc *dev)
1402 {
1403         /* start enumeration now, or after power detect irq */
1404         if (readl(&dev->regs->power_detect) & PW_DETECT)
1405                 ep0_start(dev);
1406         else {
1407                 DBG(dev, "%s\n", __FUNCTION__);
1408                 dev->int_enable = INT_PWRDETECT;
1409                 writel(dev->int_enable, &dev->regs->int_enable);
1410         }
1411 }
1412
1413 /*-------------------------------------------------------------------------*/
1414
1415 /* keeping it simple:
1416  * - one bus driver, initted first;
1417  * - one function driver, initted second
1418  */
1419
1420 static struct goku_udc  *the_controller;
1421
1422 /* when a driver is successfully registered, it will receive
1423  * control requests including set_configuration(), which enables
1424  * non-control requests.  then usb traffic follows until a
1425  * disconnect is reported.  then a host may connect again, or
1426  * the driver might get unbound.
1427  */
1428 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1429 {
1430         struct goku_udc *dev = the_controller;
1431         int                     retval;
1432
1433         if (!driver
1434                         || driver->speed != USB_SPEED_FULL
1435                         || !driver->bind
1436                         || !driver->unbind
1437                         || !driver->disconnect
1438                         || !driver->setup)
1439                 return -EINVAL;
1440         if (!dev)
1441                 return -ENODEV;
1442         if (dev->driver)
1443                 return -EBUSY;
1444
1445         /* hook up the driver */
1446         driver->driver.bus = NULL;
1447         dev->driver = driver;
1448         dev->gadget.dev.driver = &driver->driver;
1449         retval = driver->bind(&dev->gadget);
1450         if (retval) {
1451                 DBG(dev, "bind to driver %s --> error %d\n",
1452                                 driver->driver.name, retval);
1453                 dev->driver = NULL;
1454                 dev->gadget.dev.driver = NULL;
1455                 return retval;
1456         }
1457
1458         /* then enable host detection and ep0; and we're ready
1459          * for set_configuration as well as eventual disconnect.
1460          */
1461         udc_enable(dev);
1462
1463         DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1464         return 0;
1465 }
1466 EXPORT_SYMBOL(usb_gadget_register_driver);
1467
1468 static void
1469 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1470 {
1471         unsigned        i;
1472
1473         DBG (dev, "%s\n", __FUNCTION__);
1474
1475         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1476                 driver = NULL;
1477
1478         /* disconnect gadget driver after quiesceing hw and the driver */
1479         udc_reset (dev);
1480         for (i = 0; i < 4; i++)
1481                 nuke(&dev->ep [i], -ESHUTDOWN);
1482         if (driver) {
1483                 spin_unlock(&dev->lock);
1484                 driver->disconnect(&dev->gadget);
1485                 spin_lock(&dev->lock);
1486         }
1487
1488         if (dev->driver)
1489                 udc_enable(dev);
1490 }
1491
1492 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1493 {
1494         struct goku_udc *dev = the_controller;
1495         unsigned long   flags;
1496
1497         if (!dev)
1498                 return -ENODEV;
1499         if (!driver || driver != dev->driver)
1500                 return -EINVAL;
1501
1502         spin_lock_irqsave(&dev->lock, flags);
1503         dev->driver = NULL;
1504         stop_activity(dev, driver);
1505         spin_unlock_irqrestore(&dev->lock, flags);
1506
1507         driver->unbind(&dev->gadget);
1508
1509         DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1510         return 0;
1511 }
1512 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1513
1514
1515 /*-------------------------------------------------------------------------*/
1516
1517 static void ep0_setup(struct goku_udc *dev)
1518 {
1519         struct goku_udc_regs __iomem    *regs = dev->regs;
1520         struct usb_ctrlrequest          ctrl;
1521         int                             tmp;
1522
1523         /* read SETUP packet and enter DATA stage */
1524         ctrl.bRequestType = readl(&regs->bRequestType);
1525         ctrl.bRequest = readl(&regs->bRequest);
1526         ctrl.wValue  = cpu_to_le16((readl(&regs->wValueH)  << 8)
1527                                         | readl(&regs->wValueL));
1528         ctrl.wIndex  = cpu_to_le16((readl(&regs->wIndexH)  << 8)
1529                                         | readl(&regs->wIndexL));
1530         ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1531                                         | 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 = le16_to_cpu(ctrl.wIndex) & 0x0f;
1554                                 /* active endpoint */
1555                                 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1556                                         goto stall;
1557                                 if (ctrl.wIndex & __constant_cpu_to_le16(
1558                                                 USB_DIR_IN)) {
1559                                         if (!dev->ep[tmp].is_in)
1560                                                 goto stall;
1561                                 } else {
1562                                         if (dev->ep[tmp].is_in)
1563                                                 goto stall;
1564                                 }
1565                                 if (ctrl.wValue != __constant_cpu_to_le16(
1566                                                 USB_ENDPOINT_HALT))
1567                                         goto stall;
1568                                 if (tmp)
1569                                         goku_clear_halt(&dev->ep[tmp]);
1570 succeed:
1571                                 /* start ep0out status stage */
1572                                 writel(~(1<<0), &regs->EOP);
1573                                 dev->ep[0].stopped = 1;
1574                                 dev->ep0state = EP0_STATUS;
1575                                 return;
1576                         case USB_RECIP_DEVICE:
1577                                 /* device remote wakeup: always clear */
1578                                 if (ctrl.wValue != __constant_cpu_to_le16(1))
1579                                         goto stall;
1580                                 VDBG(dev, "clear dev remote wakeup\n");
1581                                 goto succeed;
1582                         case USB_RECIP_INTERFACE:
1583                                 goto stall;
1584                         default:                /* pass to gadget driver */
1585                                 break;
1586                         }
1587                         break;
1588                 default:
1589                         break;
1590                 }
1591         }
1592
1593 #ifdef USB_TRACE
1594         VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1595                 ctrl.bRequestType, ctrl.bRequest,
1596                 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1597                 le16_to_cpu(ctrl.wLength));
1598 #endif
1599
1600         /* hw wants to know when we're configured (or not) */
1601         dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1602                                 && ctrl.bRequestType == USB_RECIP_DEVICE);
1603         if (unlikely(dev->req_config))
1604                 dev->configured = (ctrl.wValue != __constant_cpu_to_le16(0));
1605
1606         /* delegate everything to the gadget driver.
1607          * it may respond after this irq handler returns.
1608          */
1609         spin_unlock (&dev->lock);
1610         tmp = dev->driver->setup(&dev->gadget, &ctrl);
1611         spin_lock (&dev->lock);
1612         if (unlikely(tmp < 0)) {
1613 stall:
1614 #ifdef USB_TRACE
1615                 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1616                                 ctrl.bRequestType, ctrl.bRequest, tmp);
1617 #endif
1618                 command(regs, COMMAND_STALL, 0);
1619                 dev->ep[0].stopped = 1;
1620                 dev->ep0state = EP0_STALL;
1621         }
1622
1623         /* expect at least one data or status stage irq */
1624 }
1625
1626 #define ACK(irqbit) { \
1627                 stat &= ~irqbit; \
1628                 writel(~irqbit, &regs->int_status); \
1629                 handled = 1; \
1630                 }
1631
1632 static irqreturn_t goku_irq(int irq, void *_dev, struct pt_regs *r)
1633 {
1634         struct goku_udc                 *dev = _dev;
1635         struct goku_udc_regs __iomem    *regs = dev->regs;
1636         struct goku_ep                  *ep;
1637         u32                             stat, handled = 0;
1638         unsigned                        i, rescans = 5;
1639
1640         spin_lock(&dev->lock);
1641
1642 rescan:
1643         stat = readl(&regs->int_status) & dev->int_enable;
1644         if (!stat)
1645                 goto done;
1646         dev->irqs++;
1647
1648         /* device-wide irqs */
1649         if (unlikely(stat & INT_DEVWIDE)) {
1650                 if (stat & INT_SYSERROR) {
1651                         ERROR(dev, "system error\n");
1652                         stop_activity(dev, dev->driver);
1653                         stat = 0;
1654                         handled = 1;
1655                         // FIXME have a neater way to prevent re-enumeration
1656                         dev->driver = NULL;
1657                         goto done;
1658                 }
1659                 if (stat & INT_PWRDETECT) {
1660                         writel(~stat, &regs->int_status);
1661                         if (readl(&dev->regs->power_detect) & PW_DETECT) {
1662                                 VDBG(dev, "connect\n");
1663                                 ep0_start(dev);
1664                         } else {
1665                                 DBG(dev, "disconnect\n");
1666                                 if (dev->gadget.speed == USB_SPEED_FULL)
1667                                         stop_activity(dev, dev->driver);
1668                                 dev->ep0state = EP0_DISCONNECT;
1669                                 dev->int_enable = INT_DEVWIDE;
1670                                 writel(dev->int_enable, &dev->regs->int_enable);
1671                         }
1672                         stat = 0;
1673                         handled = 1;
1674                         goto done;
1675                 }
1676                 if (stat & INT_SUSPEND) {
1677                         ACK(INT_SUSPEND);
1678                         if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1679                                 switch (dev->ep0state) {
1680                                 case EP0_DISCONNECT:
1681                                 case EP0_SUSPEND:
1682                                         goto pm_next;
1683                                 default:
1684                                         break;
1685                                 }
1686                                 DBG(dev, "USB suspend\n");
1687                                 dev->ep0state = EP0_SUSPEND;
1688                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1689                                                 && dev->driver
1690                                                 && dev->driver->suspend) {
1691                                         spin_unlock(&dev->lock);
1692                                         dev->driver->suspend(&dev->gadget);
1693                                         spin_lock(&dev->lock);
1694                                 }
1695                         } else {
1696                                 if (dev->ep0state != EP0_SUSPEND) {
1697                                         DBG(dev, "bogus USB resume %d\n",
1698                                                 dev->ep0state);
1699                                         goto pm_next;
1700                                 }
1701                                 DBG(dev, "USB resume\n");
1702                                 dev->ep0state = EP0_IDLE;
1703                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1704                                                 && dev->driver
1705                                                 && dev->driver->resume) {
1706                                         spin_unlock(&dev->lock);
1707                                         dev->driver->resume(&dev->gadget);
1708                                         spin_lock(&dev->lock);
1709                                 }
1710                         }
1711                 }
1712 pm_next:
1713                 if (stat & INT_USBRESET) {              /* hub reset done */
1714                         ACK(INT_USBRESET);
1715                         INFO(dev, "USB reset done, gadget %s\n",
1716                                 dev->driver->driver.name);
1717                 }
1718                 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1719         }
1720
1721         /* progress ep0 setup, data, or status stages.
1722          * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1723          */
1724         if (stat & INT_SETUP) {
1725                 ACK(INT_SETUP);
1726                 dev->ep[0].irqs++;
1727                 ep0_setup(dev);
1728         }
1729         if (stat & INT_STATUSNAK) {
1730                 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1731                 if (dev->ep0state == EP0_IN) {
1732                         ep = &dev->ep[0];
1733                         ep->irqs++;
1734                         nuke(ep, 0);
1735                         writel(~(1<<0), &regs->EOP);
1736                         dev->ep0state = EP0_STATUS;
1737                 }
1738         }
1739         if (stat & INT_ENDPOINT0) {
1740                 ACK(INT_ENDPOINT0);
1741                 ep = &dev->ep[0];
1742                 ep->irqs++;
1743                 pio_advance(ep);
1744         }
1745
1746         /* dma completion */
1747         if (stat & INT_MSTRDEND) {      /* IN */
1748                 ACK(INT_MSTRDEND);
1749                 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1750                 ep->irqs++;
1751                 dma_advance(dev, ep);
1752         }
1753         if (stat & INT_MSTWREND) {      /* OUT */
1754                 ACK(INT_MSTWREND);
1755                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1756                 ep->irqs++;
1757                 dma_advance(dev, ep);
1758         }
1759         if (stat & INT_MSTWRTMOUT) {    /* OUT */
1760                 ACK(INT_MSTWRTMOUT);
1761                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1762                 ep->irqs++;
1763                 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1764                 // reset dma? then dma_advance()
1765         }
1766
1767         /* pio */
1768         for (i = 1; i < 4; i++) {
1769                 u32             tmp = INT_EPxDATASET(i);
1770
1771                 if (!(stat & tmp))
1772                         continue;
1773                 ep = &dev->ep[i];
1774                 pio_advance(ep);
1775                 if (list_empty (&ep->queue))
1776                         pio_irq_disable(dev, regs, i);
1777                 stat &= ~tmp;
1778                 handled = 1;
1779                 ep->irqs++;
1780         }
1781
1782         if (rescans--)
1783                 goto rescan;
1784
1785 done:
1786         (void)readl(&regs->int_enable);
1787         spin_unlock(&dev->lock);
1788         if (stat)
1789                 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1790                                 readl(&regs->int_status), dev->int_enable);
1791         return IRQ_RETVAL(handled);
1792 }
1793
1794 #undef ACK
1795
1796 /*-------------------------------------------------------------------------*/
1797
1798 static void gadget_release(struct device *_dev)
1799 {
1800         struct goku_udc *dev = dev_get_drvdata(_dev);
1801
1802         kfree(dev);
1803 }
1804
1805 /* tear down the binding between this driver and the pci device */
1806
1807 static void goku_remove(struct pci_dev *pdev)
1808 {
1809         struct goku_udc         *dev = pci_get_drvdata(pdev);
1810
1811         DBG(dev, "%s\n", __FUNCTION__);
1812         /* start with the driver above us */
1813         if (dev->driver) {
1814                 /* should have been done already by driver model core */
1815                 WARN(dev, "pci remove, driver '%s' is still registered\n",
1816                                 dev->driver->driver.name);
1817                 usb_gadget_unregister_driver(dev->driver);
1818         }
1819
1820 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1821         remove_proc_entry(proc_node_name, NULL);
1822 #endif
1823         if (dev->regs)
1824                 udc_reset(dev);
1825         if (dev->got_irq)
1826                 free_irq(pdev->irq, dev);
1827         if (dev->regs)
1828                 iounmap(dev->regs);
1829         if (dev->got_region)
1830                 release_mem_region(pci_resource_start (pdev, 0),
1831                                 pci_resource_len (pdev, 0));
1832         if (dev->enabled)
1833                 pci_disable_device(pdev);
1834         device_unregister(&dev->gadget.dev);
1835
1836         pci_set_drvdata(pdev, NULL);
1837         dev->regs = NULL;
1838         the_controller = NULL;
1839
1840         INFO(dev, "unbind\n");
1841 }
1842
1843 /* wrap this driver around the specified pci device, but
1844  * don't respond over USB until a gadget driver binds to us.
1845  */
1846
1847 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1848 {
1849         struct goku_udc         *dev = NULL;
1850         unsigned long           resource, len;
1851         void __iomem            *base = NULL;
1852         int                     retval;
1853
1854         /* if you want to support more than one controller in a system,
1855          * usb_gadget_driver_{register,unregister}() must change.
1856          */
1857         if (the_controller) {
1858                 WARN(dev, "ignoring %s\n", pci_name(pdev));
1859                 return -EBUSY;
1860         }
1861         if (!pdev->irq) {
1862                 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1863                 retval = -ENODEV;
1864                 goto done;
1865         }
1866
1867         /* alloc, and start init */
1868         dev = kmalloc (sizeof *dev, SLAB_KERNEL);
1869         if (dev == NULL){
1870                 pr_debug("enomem %s\n", pci_name(pdev));
1871                 retval = -ENOMEM;
1872                 goto done;
1873         }
1874
1875         memset(dev, 0, sizeof *dev);
1876         spin_lock_init(&dev->lock);
1877         dev->pdev = pdev;
1878         dev->gadget.ops = &goku_ops;
1879
1880         /* the "gadget" abstracts/virtualizes the controller */
1881         strcpy(dev->gadget.dev.bus_id, "gadget");
1882         dev->gadget.dev.parent = &pdev->dev;
1883         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1884         dev->gadget.dev.release = gadget_release;
1885         dev->gadget.name = driver_name;
1886
1887         /* now all the pci goodies ... */
1888         retval = pci_enable_device(pdev);
1889         if (retval < 0) {
1890                 DBG(dev, "can't enable, %d\n", retval);
1891                 goto done;
1892         }
1893         dev->enabled = 1;
1894
1895         resource = pci_resource_start(pdev, 0);
1896         len = pci_resource_len(pdev, 0);
1897         if (!request_mem_region(resource, len, driver_name)) {
1898                 DBG(dev, "controller already in use\n");
1899                 retval = -EBUSY;
1900                 goto done;
1901         }
1902         dev->got_region = 1;
1903
1904         base = ioremap_nocache(resource, len);
1905         if (base == NULL) {
1906                 DBG(dev, "can't map memory\n");
1907                 retval = -EFAULT;
1908                 goto done;
1909         }
1910         dev->regs = (struct goku_udc_regs __iomem *) base;
1911
1912         pci_set_drvdata(pdev, dev);
1913         INFO(dev, "%s\n", driver_desc);
1914         INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1915         INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1916
1917         /* init to known state, then setup irqs */
1918         udc_reset(dev);
1919         udc_reinit (dev);
1920         if (request_irq(pdev->irq, goku_irq, SA_SHIRQ/*|SA_SAMPLE_RANDOM*/,
1921                         driver_name, dev) != 0) {
1922                 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1923                 retval = -EBUSY;
1924                 goto done;
1925         }
1926         dev->got_irq = 1;
1927         if (use_dma)
1928                 pci_set_master(pdev);
1929
1930
1931 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1932         create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1933 #endif
1934
1935         /* done */
1936         the_controller = dev;
1937         device_register(&dev->gadget.dev);
1938
1939         return 0;
1940
1941 done:
1942         if (dev)
1943                 goku_remove (pdev);
1944         return retval;
1945 }
1946
1947
1948 /*-------------------------------------------------------------------------*/
1949
1950 static struct pci_device_id pci_ids [] = { {
1951         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1952         .class_mask =   ~0,
1953         .vendor =       0x102f,         /* Toshiba */
1954         .device =       0x0107,         /* this UDC */
1955         .subvendor =    PCI_ANY_ID,
1956         .subdevice =    PCI_ANY_ID,
1957
1958 }, { /* end: all zeroes */ }
1959 };
1960 MODULE_DEVICE_TABLE (pci, pci_ids);
1961
1962 static struct pci_driver goku_pci_driver = {
1963         .name =         (char *) driver_name,
1964         .id_table =     pci_ids,
1965
1966         .probe =        goku_probe,
1967         .remove =       goku_remove,
1968
1969         /* FIXME add power management support */
1970 };
1971
1972 static int __init init (void)
1973 {
1974         return pci_register_driver (&goku_pci_driver);
1975 }
1976 module_init (init);
1977
1978 static void __exit cleanup (void)
1979 {
1980         pci_unregister_driver (&goku_pci_driver);
1981 }
1982 module_exit (cleanup);