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 *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    *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 *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    *regs = ep->dev->regs;
 213                         u32                     tmp;
 214
 215                         tmp = readl(&regs->EPxSingle);
 216                         tmp &= ~(0x11 << ep->num);
 217                         writel(tmp, &regs->EPxSingle);
 218
 219                         tmp = readl(&regs->EPxBCS);
 220                         tmp &= ~(0x11 << ep->num);
 221                         writel(tmp, &regs->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 = 0;
 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 0;
 278         req = kmalloc(sizeof *req, gfp_flags);
 279         if (!req)
 280                 return 0;
 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 0;
 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 *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    *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, struct goku_udc_regs *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, struct goku_udc_regs *regs, int epnum)
 593 {
 594         dev->int_enable &= ~INT_EPxDATASET (epnum);
 595         writel(dev->int_enable, &regs->int_enable);
 596         /* write may still be posted */
 597 }
 598
 599 static inline void
 600 pio_advance(struct goku_ep *ep)
 601 {
 602         struct goku_request     *req;
 603
 604         if (unlikely(list_empty (&ep->queue)))
 605                 return;
 606         req = list_entry(ep->queue.next, struct goku_request, queue);
 607         (ep->is_in ? write_fifo : read_fifo)(ep, req);
 608 }
 609
 610
 611 /*-------------------------------------------------------------------------*/
 612
 613 // return:  0 = q running, 1 = q stopped, negative = errno
 614 static int start_dma(struct goku_ep *ep, struct goku_request *req)
 615 {
 616         struct goku_udc_regs    *regs = ep->dev->regs;
 617         u32                     master;
 618         u32                     start = req->req.dma;
 619         u32                     end = start + req->req.length - 1;
 620
 621         master = readl(&regs->dma_master) & MST_RW_BITS;
 622
 623         /* re-init the bits affecting IN dma; careful with zlps */
 624         if (likely(ep->is_in)) {
 625                 if (unlikely(master & MST_RD_ENA)) {
 626                         DBG (ep->dev, "start, IN active dma %03x!!\n",
 627                                 master);
 628 //                      return -EL2HLT;
 629                 }
 630                 writel(end, &regs->in_dma_end);
 631                 writel(start, &regs->in_dma_start);
 632
 633                 master &= ~MST_R_BITS;
 634                 if (unlikely(req->req.length == 0))
 635                         master = MST_RD_ENA | MST_RD_EOPB;
 636                 else if ((req->req.length % ep->ep.maxpacket) != 0
 637                                         || req->req.zero)
 638                         master = MST_RD_ENA | MST_EOPB_ENA;
 639                 else
 640                         master = MST_RD_ENA | MST_EOPB_DIS;
 641
 642                 ep->dev->int_enable |= INT_MSTRDEND;
 643
 644         /* Goku DMA-OUT merges short packets, which plays poorly with
 645          * protocols where short packets mark the transfer boundaries.
 646          * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
 647          * ending transfers after 3 SOFs; we don't turn it on.
 648          */
 649         } else {
 650                 if (unlikely(master & MST_WR_ENA)) {
 651                         DBG (ep->dev, "start, OUT active dma %03x!!\n",
 652                                 master);
 653 //                      return -EL2HLT;
 654                 }
 655                 writel(end, &regs->out_dma_end);
 656                 writel(start, &regs->out_dma_start);
 657
 658                 master &= ~MST_W_BITS;
 659                 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
 660
 661                 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
 662         }
 663
 664         writel(master, &regs->dma_master);
 665         writel(ep->dev->int_enable, &regs->int_enable);
 666         return 0;
 667 }
 668
 669 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
 670 {
 671         struct goku_request     *req;
 672         struct goku_udc_regs    *regs = ep->dev->regs;
 673         u32                     master;
 674
 675         master = readl(&regs->dma_master);
 676
 677         if (unlikely(list_empty(&ep->queue))) {
 678 stop:
 679                 if (ep->is_in)
 680                         dev->int_enable &= ~INT_MSTRDEND;
 681                 else
 682                         dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
 683                 writel(dev->int_enable, &regs->int_enable);
 684                 return;
 685         }
 686         req = list_entry(ep->queue.next, struct goku_request, queue);
 687
 688         /* normal hw dma completion (not abort) */
 689         if (likely(ep->is_in)) {
 690                 if (unlikely(master & MST_RD_ENA))
 691                         return;
 692                 req->req.actual = readl(&regs->in_dma_current);
 693         } else {
 694                 if (unlikely(master & MST_WR_ENA))
 695                         return;
 696
 697                 /* hardware merges short packets, and also hides packet
 698                  * overruns.  a partial packet MAY be in the fifo here.
 699                  */
 700                 req->req.actual = readl(&regs->out_dma_current);
 701         }
 702         req->req.actual -= req->req.dma;
 703         req->req.actual++;
 704
 705 #ifdef USB_TRACE
 706         VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
 707                 ep->ep.name, ep->is_in ? "IN" : "OUT",
 708                 req->req.actual, req->req.length, req);
 709 #endif
 710         done(ep, req, 0);
 711         if (list_empty(&ep->queue))
 712                 goto stop;
 713         req = list_entry(ep->queue.next, struct goku_request, queue);
 714         (void) start_dma(ep, req);
 715 }
 716
 717 static void abort_dma(struct goku_ep *ep, int status)
 718 {
 719         struct goku_udc_regs    *regs = ep->dev->regs;
 720         struct goku_request     *req;
 721         u32                     curr, master;
 722
 723         /* NAK future host requests, hoping the implicit delay lets the
 724          * dma engine finish reading (or writing) its latest packet and
 725          * empty the dma buffer (up to 16 bytes).
 726          *
 727          * This avoids needing to clean up a partial packet in the fifo;
 728          * we can't do that for IN without side effects to HALT and TOGGLE.
 729          */
 730         command(regs, COMMAND_FIFO_DISABLE, ep->num);
 731         req = list_entry(ep->queue.next, struct goku_request, queue);
 732         master = readl(&regs->dma_master) & MST_RW_BITS;
 733
 734         /* FIXME using these resets isn't usably documented. this may
 735          * not work unless it's followed by disabling the endpoint.
 736          *
 737          * FIXME the OUT reset path doesn't even behave consistently.
 738          */
 739         if (ep->is_in) {
 740                 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
 741                         goto finished;
 742                 curr = readl(&regs->in_dma_current);
 743
 744                 writel(curr, &regs->in_dma_end);
 745                 writel(curr, &regs->in_dma_start);
 746
 747                 master &= ~MST_R_BITS;
 748                 master |= MST_RD_RESET;
 749                 writel(master, &regs->dma_master);
 750
 751                 if (readl(&regs->dma_master) & MST_RD_ENA)
 752                         DBG(ep->dev, "IN dma active after reset!\n");
 753
 754         } else {
 755                 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
 756                         goto finished;
 757                 curr = readl(&regs->out_dma_current);
 758
 759                 writel(curr, &regs->out_dma_end);
 760                 writel(curr, &regs->out_dma_start);
 761
 762                 master &= ~MST_W_BITS;
 763                 master |= MST_WR_RESET;
 764                 writel(master, &regs->dma_master);
 765
 766                 if (readl(&regs->dma_master) & MST_WR_ENA)
 767                         DBG(ep->dev, "OUT dma active after reset!\n");
 768         }
 769         req->req.actual = (curr - req->req.dma) + 1;
 770         req->req.status = status;
 771
 772         VDBG(ep->dev, "%s %s %s %d/%d\n", __FUNCTION__, ep->ep.name,
 773                 ep->is_in ? "IN" : "OUT",
 774                 req->req.actual, req->req.length);
 775
 776         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 777
 778         return;
 779
 780 finished:
 781         /* dma already completed; no abort needed */
 782         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 783         req->req.actual = req->req.length;
 784         req->req.status = 0;
 785 }
 786
 787 /*-------------------------------------------------------------------------*/
 788
 789 static int
 790 goku_queue(struct usb_ep *_ep, struct usb_request *_req, int gfp_flags)
 791 {
 792         struct goku_request     *req;
 793         struct goku_ep          *ep;
 794         struct goku_udc         *dev;
 795         unsigned long           flags;
 796         int                     status;
 797
 798         /* always require a cpu-view buffer so pio works */
 799         req = container_of(_req, struct goku_request, req);
 800         if (unlikely(!_req || !_req->complete
 801                         || !_req->buf || !list_empty(&req->queue)))
 802                 return -EINVAL;
 803         ep = container_of(_ep, struct goku_ep, ep);
 804         if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
 805                 return -EINVAL;
 806         dev = ep->dev;
 807         if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
 808                 return -ESHUTDOWN;
 809
 810         /* can't touch registers when suspended */
 811         if (dev->ep0state == EP0_SUSPEND)
 812                 return -EBUSY;
 813
 814         /* set up dma mapping in case the caller didn't */
 815         if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
 816                 _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
 817                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 818                 req->mapped = 1;
 819         }
 820
 821 #ifdef USB_TRACE
 822         VDBG(dev, "%s queue req %p, len %u buf %p\n",
 823                         _ep->name, _req, _req->length, _req->buf);
 824 #endif
 825
 826         spin_lock_irqsave(&dev->lock, flags);
 827
 828         _req->status = -EINPROGRESS;
 829         _req->actual = 0;
 830
 831         /* for ep0 IN without premature status, zlp is required and
 832          * writing EOP starts the status stage (OUT).
 833          */
 834         if (unlikely(ep->num == 0 && ep->is_in))
 835                 _req->zero = 1;
 836
 837         /* kickstart this i/o queue? */
 838         status = 0;
 839         if (list_empty(&ep->queue) && likely(!ep->stopped)) {
 840                 /* dma:  done after dma completion IRQ (or error)
 841                  * pio:  done after last fifo operation
 842                  */
 843                 if (ep->dma)
 844                         status = start_dma(ep, req);
 845                 else
 846                         status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
 847
 848                 if (unlikely(status != 0)) {
 849                         if (status > 0)
 850                                 status = 0;
 851                         req = 0;
 852                 }
 853
 854         } /* else pio or dma irq handler advances the queue. */
 855
 856         if (likely(req != 0))
 857                 list_add_tail(&req->queue, &ep->queue);
 858
 859         if (likely(!list_empty(&ep->queue))
 860                         && likely(ep->num != 0)
 861                         && !ep->dma
 862                         && !(dev->int_enable & INT_EPxDATASET (ep->num)))
 863                 pio_irq_enable(dev, dev->regs, ep->num);
 864
 865         spin_unlock_irqrestore(&dev->lock, flags);
 866
 867         /* pci writes may still be posted */
 868         return status;
 869 }
 870
 871 /* dequeue ALL requests */
 872 static void nuke(struct goku_ep *ep, int status)
 873 {
 874         struct goku_request     *req;
 875
 876         ep->stopped = 1;
 877         if (list_empty(&ep->queue))
 878                 return;
 879         if (ep->dma)
 880                 abort_dma(ep, status);
 881         while (!list_empty(&ep->queue)) {
 882                 req = list_entry(ep->queue.next, struct goku_request, queue);
 883                 done(ep, req, status);
 884         }
 885 }
 886
 887 /* dequeue JUST ONE request */
 888 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 889 {
 890         struct goku_request     *req;
 891         struct goku_ep          *ep;
 892         struct goku_udc         *dev;
 893         unsigned long           flags;
 894
 895         ep = container_of(_ep, struct goku_ep, ep);
 896         if (!_ep || !_req || (!ep->desc && ep->num != 0))
 897                 return -EINVAL;
 898         dev = ep->dev;
 899         if (!dev->driver)
 900                 return -ESHUTDOWN;
 901
 902         /* we can't touch (dma) registers when suspended */
 903         if (dev->ep0state == EP0_SUSPEND)
 904                 return -EBUSY;
 905
 906         VDBG(dev, "%s %s %s %s %p\n", __FUNCTION__, _ep->name,
 907                 ep->is_in ? "IN" : "OUT",
 908                 ep->dma ? "dma" : "pio",
 909                 _req);
 910
 911         spin_lock_irqsave(&dev->lock, flags);
 912
 913         /* make sure it's actually queued on this endpoint */
 914         list_for_each_entry (req, &ep->queue, queue) {
 915                 if (&req->req == _req)
 916                         break;
 917         }
 918         if (&req->req != _req) {
 919                 spin_unlock_irqrestore (&dev->lock, flags);
 920                 return -EINVAL;
 921         }
 922
 923         if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
 924                 abort_dma(ep, -ECONNRESET);
 925                 done(ep, req, -ECONNRESET);
 926                 dma_advance(dev, ep);
 927         } else if (!list_empty(&req->queue))
 928                 done(ep, req, -ECONNRESET);
 929         else
 930                 req = 0;
 931         spin_unlock_irqrestore(&dev->lock, flags);
 932
 933         return req ? 0 : -EOPNOTSUPP;
 934 }
 935
 936 /*-------------------------------------------------------------------------*/
 937
 938 static void goku_clear_halt(struct goku_ep *ep)
 939 {
 940         // assert (ep->num !=0)
 941         VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
 942         command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
 943         command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
 944         if (ep->stopped) {
 945                 ep->stopped = 0;
 946                 if (ep->dma) {
 947                         struct goku_request     *req;
 948
 949                         if (list_empty(&ep->queue))
 950                                 return;
 951                         req = list_entry(ep->queue.next, struct goku_request,
 952                                                 queue);
 953                         (void) start_dma(ep, req);
 954                 } else
 955                         pio_advance(ep);
 956         }
 957 }
 958
 959 static int goku_set_halt(struct usb_ep *_ep, int value)
 960 {
 961         struct goku_ep  *ep;
 962         unsigned long   flags;
 963         int             retval = 0;
 964
 965         if (!_ep)
 966                 return -ENODEV;
 967         ep = container_of (_ep, struct goku_ep, ep);
 968
 969         if (ep->num == 0) {
 970                 if (value) {
 971                         ep->dev->ep0state = EP0_STALL;
 972                         ep->dev->ep[0].stopped = 1;
 973                 } else
 974                         return -EINVAL;
 975
 976         /* don't change EPxSTATUS_EP_INVALID to READY */
 977         } else if (!ep->desc) {
 978                 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
 979                 return -EINVAL;
 980         }
 981
 982         spin_lock_irqsave(&ep->dev->lock, flags);
 983         if (!list_empty(&ep->queue))
 984                 retval = -EAGAIN;
 985         else if (ep->is_in && value
 986                         /* data in (either) packet buffer? */
 987                         && (ep->dev->regs->DataSet & DATASET_AB(ep->num)))
 988                 retval = -EAGAIN;
 989         else if (!value)
 990                 goku_clear_halt(ep);
 991         else {
 992                 ep->stopped = 1;
 993                 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
 994                 command(ep->dev->regs, COMMAND_STALL, ep->num);
 995                 readl(ep->reg_status);
 996         }
 997         spin_unlock_irqrestore(&ep->dev->lock, flags);
 998         return retval;
 999 }
1000
1001 static int goku_fifo_status(struct usb_ep *_ep)
1002 {
1003         struct goku_ep          *ep;
1004         struct goku_udc_regs    *regs;
1005         u32                     size;
1006
1007         if (!_ep)
1008                 return -ENODEV;
1009         ep = container_of(_ep, struct goku_ep, ep);
1010
1011         /* size is only reported sanely for OUT */
1012         if (ep->is_in)
1013                 return -EOPNOTSUPP;
1014
1015         /* ignores 16-byte dma buffer; SizeH == 0 */
1016         regs = ep->dev->regs;
1017         size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
1018         size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
1019         VDBG(ep->dev, "%s %s %u\n", __FUNCTION__, ep->ep.name, size);
1020         return size;
1021 }
1022
1023 static void goku_fifo_flush(struct usb_ep *_ep)
1024 {
1025         struct goku_ep          *ep;
1026         struct goku_udc_regs    *regs;
1027         u32                     size;
1028
1029         if (!_ep)
1030                 return;
1031         ep = container_of(_ep, struct goku_ep, ep);
1032         VDBG(ep->dev, "%s %s\n", __FUNCTION__, ep->ep.name);
1033
1034         /* don't change EPxSTATUS_EP_INVALID to READY */
1035         if (!ep->desc && ep->num != 0) {
1036                 DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
1037                 return;
1038         }
1039
1040         regs = ep->dev->regs;
1041         size = readl(&regs->EPxSizeLA[ep->num]);
1042         size &= DATASIZE;
1043
1044         /* Non-desirable behavior:  FIFO_CLEAR also clears the
1045          * endpoint halt feature.  For OUT, we _could_ just read
1046          * the bytes out (PIO, if !ep->dma); for in, no choice.
1047          */
1048         if (size)
1049                 command(regs, COMMAND_FIFO_CLEAR, ep->num);
1050 }
1051
1052 static struct usb_ep_ops goku_ep_ops = {
1053         .enable         = goku_ep_enable,
1054         .disable        = goku_ep_disable,
1055
1056         .alloc_request  = goku_alloc_request,
1057         .free_request   = goku_free_request,
1058
1059         .alloc_buffer   = goku_alloc_buffer,
1060         .free_buffer    = goku_free_buffer,
1061
1062         .queue          = goku_queue,
1063         .dequeue        = goku_dequeue,
1064
1065         .set_halt       = goku_set_halt,
1066         .fifo_status    = goku_fifo_status,
1067         .fifo_flush     = goku_fifo_flush,
1068 };
1069
1070 /*-------------------------------------------------------------------------*/
1071
1072 static int goku_get_frame(struct usb_gadget *_gadget)
1073 {
1074         return -EOPNOTSUPP;
1075 }
1076
1077 static const struct usb_gadget_ops goku_ops = {
1078         .get_frame      = goku_get_frame,
1079         // no remote wakeup
1080         // not selfpowered
1081 };
1082
1083 /*-------------------------------------------------------------------------*/
1084
1085 static inline char *dmastr(void)
1086 {
1087         if (use_dma == 0)
1088                 return "(dma disabled)";
1089         else if (use_dma == 2)
1090                 return "(dma IN and OUT)";
1091         else
1092                 return "(dma IN)";
1093 }
1094
1095 /* if we're trying to save space, don't bother with this proc file */
1096
1097 #if defined(CONFIG_PROC_FS) && !defined(CONFIG_EMBEDDED)
1098 #  define       UDC_PROC_FILE
1099 #endif
1100
1101 #ifdef UDC_PROC_FILE
1102
1103 static const char proc_node_name [] = "driver/udc";
1104
1105 #define FOURBITS "%s%s%s%s"
1106 #define EIGHTBITS FOURBITS FOURBITS
1107
1108 static void
1109 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1110 {
1111         int t;
1112
1113         /* int_status is the same format ... */
1114         t = scnprintf(*next, *size,
1115                 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1116                 label, mask,
1117                 (mask & INT_PWRDETECT) ? " power" : "",
1118                 (mask & INT_SYSERROR) ? " sys" : "",
1119                 (mask & INT_MSTRDEND) ? " in-dma" : "",
1120                 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1121
1122                 (mask & INT_MSTWREND) ? " out-dma" : "",
1123                 (mask & INT_MSTWRSET) ? " wrset" : "",
1124                 (mask & INT_ERR) ? " err" : "",
1125                 (mask & INT_SOF) ? " sof" : "",
1126
1127                 (mask & INT_EP3NAK) ? " ep3nak" : "",
1128                 (mask & INT_EP2NAK) ? " ep2nak" : "",
1129                 (mask & INT_EP1NAK) ? " ep1nak" : "",
1130                 (mask & INT_EP3DATASET) ? " ep3" : "",
1131
1132                 (mask & INT_EP2DATASET) ? " ep2" : "",
1133                 (mask & INT_EP1DATASET) ? " ep1" : "",
1134                 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1135                 (mask & INT_STATUS) ? " ep0status" : "",
1136
1137                 (mask & INT_SETUP) ? " setup" : "",
1138                 (mask & INT_ENDPOINT0) ? " ep0" : "",
1139                 (mask & INT_USBRESET) ? " reset" : "",
1140                 (mask & INT_SUSPEND) ? " suspend" : "");
1141         *size -= t;
1142         *next += t;
1143 }
1144
1145
1146 static int
1147 udc_proc_read(char *buffer, char **start, off_t off, int count,
1148                 int *eof, void *_dev)
1149 {
1150         char                    *buf = buffer;
1151         struct goku_udc         *dev = _dev;
1152         struct goku_udc_regs    *regs = dev->regs;
1153         char                    *next = buf;
1154         unsigned                size = count;
1155         unsigned long           flags;
1156         int                     i, t, is_usb_connected;
1157         u32                     tmp;
1158
1159         if (off != 0)
1160                 return 0;
1161
1162         local_irq_save(flags);
1163
1164         /* basic device status */
1165         tmp = readl(&regs->power_detect);
1166         is_usb_connected = tmp & PW_DETECT;
1167         t = scnprintf(next, size,
1168                 "%s - %s\n"
1169                 "%s version: %s %s\n"
1170                 "Gadget driver: %s\n"
1171                 "Host %s, %s\n"
1172                 "\n",
1173                 pci_name(dev->pdev), driver_desc,
1174                 driver_name, DRIVER_VERSION, dmastr(),
1175                 dev->driver ? dev->driver->driver.name : "(none)",
1176                 is_usb_connected
1177                         ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1178                         : "disconnected",
1179                 ({char *tmp;
1180                 switch(dev->ep0state){
1181                 case EP0_DISCONNECT:    tmp = "ep0_disconnect"; break;
1182                 case EP0_IDLE:          tmp = "ep0_idle"; break;
1183                 case EP0_IN:            tmp = "ep0_in"; break;
1184                 case EP0_OUT:           tmp = "ep0_out"; break;
1185                 case EP0_STATUS:        tmp = "ep0_status"; break;
1186                 case EP0_STALL:         tmp = "ep0_stall"; break;
1187                 case EP0_SUSPEND:       tmp = "ep0_suspend"; break;
1188                 default:                tmp = "ep0_?"; break;
1189                 } tmp; })
1190                 );
1191         size -= t;
1192         next += t;
1193
1194         dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1195         dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1196
1197         if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1198                 goto done;
1199
1200         /* registers for (active) device and ep0 */
1201         t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1202                         "single.bcs %02x.%02x state %x addr %u\n",
1203                         dev->irqs, readl(&regs->DataSet),
1204                         readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1205                         readl(&regs->UsbState),
1206                         readl(&regs->address));
1207         size -= t;
1208         next += t;
1209
1210         tmp = readl(&regs->dma_master);
1211         t = scnprintf(next, size,
1212                 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1213                 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1214                 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1215                 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1216                 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1217
1218                 (tmp & MST_RD_EOPB) ? " eopb" : "",
1219                 (tmp & MST_RD_RESET) ? " in_reset" : "",
1220                 (tmp & MST_WR_RESET) ? " out_reset" : "",
1221                 (tmp & MST_RD_ENA) ? " IN" : "",
1222
1223                 (tmp & MST_WR_ENA) ? " OUT" : "",
1224                 (tmp & MST_CONNECTION)
1225                         ? "ep1in/ep2out"
1226                         : "ep1out/ep2in");
1227         size -= t;
1228         next += t;
1229
1230         /* dump endpoint queues */
1231         for (i = 0; i < 4; i++) {
1232                 struct goku_ep          *ep = &dev->ep [i];
1233                 struct goku_request     *req;
1234                 int                     t;
1235
1236                 if (i && !ep->desc)
1237                         continue;
1238
1239                 tmp = readl(ep->reg_status);
1240                 t = scnprintf(next, size,
1241                         "%s %s max %u %s, irqs %lu, "
1242                         "status %02x (%s) " FOURBITS "\n",
1243                         ep->ep.name,
1244                         ep->is_in ? "in" : "out",
1245                         ep->ep.maxpacket,
1246                         ep->dma ? "dma" : "pio",
1247                         ep->irqs,
1248                         tmp, ({ char *s;
1249                         switch (tmp & EPxSTATUS_EP_MASK) {
1250                         case EPxSTATUS_EP_READY:
1251                                 s = "ready"; break;
1252                         case EPxSTATUS_EP_DATAIN:
1253                                 s = "packet"; break;
1254                         case EPxSTATUS_EP_FULL:
1255                                 s = "full"; break;
1256                         case EPxSTATUS_EP_TX_ERR:       // host will retry
1257                                 s = "tx_err"; break;
1258                         case EPxSTATUS_EP_RX_ERR:
1259                                 s = "rx_err"; break;
1260                         case EPxSTATUS_EP_BUSY:         /* ep0 only */
1261                                 s = "busy"; break;
1262                         case EPxSTATUS_EP_STALL:
1263                                 s = "stall"; break;
1264                         case EPxSTATUS_EP_INVALID:      // these "can't happen"
1265                                 s = "invalid"; break;
1266                         default:
1267                                 s = "?"; break;
1268                         }; s; }),
1269                         (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1270                         (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1271                         (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1272                         (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1273                         );
1274                 if (t <= 0 || t > size)
1275                         goto done;
1276                 size -= t;
1277                 next += t;
1278
1279                 if (list_empty(&ep->queue)) {
1280                         t = scnprintf(next, size, "\t(nothing queued)\n");
1281                         if (t <= 0 || t > size)
1282                                 goto done;
1283                         size -= t;
1284                         next += t;
1285                         continue;
1286                 }
1287                 list_for_each_entry(req, &ep->queue, queue) {
1288                         if (ep->dma && req->queue.prev == &ep->queue) {
1289                                 if (i == UDC_MSTRD_ENDPOINT)
1290                                         tmp = readl(&regs->in_dma_current);
1291                                 else
1292                                         tmp = readl(&regs->out_dma_current);
1293                                 tmp -= req->req.dma;
1294                                 tmp++;
1295                         } else
1296                                 tmp = req->req.actual;
1297
1298                         t = scnprintf(next, size,
1299                                 "\treq %p len %u/%u buf %p\n",
1300                                 &req->req, tmp, req->req.length,
1301                                 req->req.buf);
1302                         if (t <= 0 || t > size)
1303                                 goto done;
1304                         size -= t;
1305                         next += t;
1306                 }
1307         }
1308
1309 done:
1310         local_irq_restore(flags);
1311         *eof = 1;
1312         return count - size;
1313 }
1314
1315 #endif  /* UDC_PROC_FILE */
1316
1317 /*-------------------------------------------------------------------------*/
1318
1319 static void udc_reinit (struct goku_udc *dev)
1320 {
1321         static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1322
1323         unsigned i;
1324
1325         INIT_LIST_HEAD (&dev->gadget.ep_list);
1326         dev->gadget.ep0 = &dev->ep [0].ep;
1327         dev->gadget.speed = USB_SPEED_UNKNOWN;
1328         dev->ep0state = EP0_DISCONNECT;
1329         dev->irqs = 0;
1330
1331         for (i = 0; i < 4; i++) {
1332                 struct goku_ep  *ep = &dev->ep[i];
1333
1334                 ep->num = i;
1335                 ep->ep.name = names[i];
1336                 ep->reg_fifo = &dev->regs->ep_fifo [i];
1337                 ep->reg_status = &dev->regs->ep_status [i];
1338                 ep->reg_mode = &dev->regs->ep_mode[i];
1339
1340                 ep->ep.ops = &goku_ep_ops;
1341                 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1342                 ep->dev = dev;
1343                 INIT_LIST_HEAD (&ep->queue);
1344
1345                 ep_reset(0, ep);
1346         }
1347
1348         dev->ep[0].reg_mode = 0;
1349         dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1350         list_del_init (&dev->ep[0].ep.ep_list);
1351 }
1352
1353 static void udc_reset(struct goku_udc *dev)
1354 {
1355         struct goku_udc_regs    *regs = dev->regs;
1356
1357         writel(0, &regs->power_detect);
1358         writel(0, &regs->int_enable);
1359         readl(&regs->int_enable);
1360         dev->int_enable = 0;
1361
1362         /* deassert reset, leave USB D+ at hi-Z (no pullup)
1363          * don't let INT_PWRDETECT sequence begin
1364          */
1365         udelay(250);
1366         writel(PW_RESETB, &regs->power_detect);
1367         readl(&regs->int_enable);
1368 }
1369
1370 static void ep0_start(struct goku_udc *dev)
1371 {
1372         struct goku_udc_regs    *regs = dev->regs;
1373         unsigned                i;
1374
1375         VDBG(dev, "%s\n", __FUNCTION__);
1376
1377         udc_reset(dev);
1378         udc_reinit (dev);
1379         //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1380
1381         /* hw handles set_address, set_feature, get_status; maybe more */
1382         writel(   G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1383                 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1384                 | G_REQMODE_GET_DESC
1385                 | G_REQMODE_CLEAR_FEAT
1386                 , &regs->reqmode);
1387
1388         for (i = 0; i < 4; i++)
1389                 dev->ep[i].irqs = 0;
1390
1391         /* can't modify descriptors after writing UsbReady */
1392         for (i = 0; i < DESC_LEN; i++)
1393                 writel(0, &regs->descriptors[i]);
1394         writel(0, &regs->UsbReady);
1395
1396         /* expect ep0 requests when the host drops reset */
1397         writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1398         dev->int_enable = INT_DEVWIDE | INT_EP0;
1399         writel(dev->int_enable, &dev->regs->int_enable);
1400         readl(&regs->int_enable);
1401         dev->gadget.speed = USB_SPEED_FULL;
1402         dev->ep0state = EP0_IDLE;
1403 }
1404
1405 static void udc_enable(struct goku_udc *dev)
1406 {
1407         /* start enumeration now, or after power detect irq */
1408         if (readl(&dev->regs->power_detect) & PW_DETECT)
1409                 ep0_start(dev);
1410         else {
1411                 DBG(dev, "%s\n", __FUNCTION__);
1412                 dev->int_enable = INT_PWRDETECT;
1413                 writel(dev->int_enable, &dev->regs->int_enable);
1414         }
1415 }
1416
1417 /*-------------------------------------------------------------------------*/
1418
1419 /* keeping it simple:
1420  * - one bus driver, initted first;
1421  * - one function driver, initted second
1422  */
1423
1424 static struct goku_udc  *the_controller;
1425
1426 /* when a driver is successfully registered, it will receive
1427  * control requests including set_configuration(), which enables
1428  * non-control requests.  then usb traffic follows until a
1429  * disconnect is reported.  then a host may connect again, or
1430  * the driver might get unbound.
1431  */
1432 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1433 {
1434         struct goku_udc *dev = the_controller;
1435         int                     retval;
1436
1437         if (!driver
1438                         || driver->speed != USB_SPEED_FULL
1439                         || !driver->bind
1440                         || !driver->unbind
1441                         || !driver->disconnect
1442                         || !driver->setup)
1443                 return -EINVAL;
1444         if (!dev)
1445                 return -ENODEV;
1446         if (dev->driver)
1447                 return -EBUSY;
1448
1449         /* hook up the driver */
1450         driver->driver.bus = 0;
1451         dev->driver = driver;
1452         dev->gadget.dev.driver = &driver->driver;
1453         retval = driver->bind(&dev->gadget);
1454         if (retval) {
1455                 DBG(dev, "bind to driver %s --> error %d\n",
1456                                 driver->driver.name, retval);
1457                 dev->driver = 0;
1458                 dev->gadget.dev.driver = 0;
1459                 return retval;
1460         }
1461
1462         /* then enable host detection and ep0; and we're ready
1463          * for set_configuration as well as eventual disconnect.
1464          */
1465         udc_enable(dev);
1466
1467         DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1468         return 0;
1469 }
1470 EXPORT_SYMBOL(usb_gadget_register_driver);
1471
1472 static void
1473 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1474 {
1475         unsigned        i;
1476
1477         DBG (dev, "%s\n", __FUNCTION__);
1478
1479         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1480                 driver = 0;
1481
1482         /* disconnect gadget driver after quiesceing hw and the driver */
1483         udc_reset (dev);
1484         for (i = 0; i < 4; i++)
1485                 nuke(&dev->ep [i], -ESHUTDOWN);
1486         if (driver) {
1487                 spin_unlock(&dev->lock);
1488                 driver->disconnect(&dev->gadget);
1489                 spin_lock(&dev->lock);
1490         }
1491
1492         if (dev->driver)
1493                 udc_enable(dev);
1494 }
1495
1496 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1497 {
1498         struct goku_udc *dev = the_controller;
1499         unsigned long   flags;
1500
1501         if (!dev)
1502                 return -ENODEV;
1503         if (!driver || driver != dev->driver)
1504                 return -EINVAL;
1505
1506         spin_lock_irqsave(&dev->lock, flags);
1507         dev->driver = 0;
1508         stop_activity(dev, driver);
1509         spin_unlock_irqrestore(&dev->lock, flags);
1510
1511         driver->unbind(&dev->gadget);
1512
1513         DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1514         return 0;
1515 }
1516 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1517
1518
1519 /*-------------------------------------------------------------------------*/
1520
1521 static void ep0_setup(struct goku_udc *dev)
1522 {
1523         struct goku_udc_regs    *regs = dev->regs;
1524         struct usb_ctrlrequest  ctrl;
1525         int                     tmp;
1526
1527         /* read SETUP packet and enter DATA stage */
1528         ctrl.bRequestType = readl(&regs->bRequestType);
1529         ctrl.bRequest = readl(&regs->bRequest);
1530         ctrl.wValue  = (readl(&regs->wValueH)  << 8) | readl(&regs->wValueL);
1531         ctrl.wIndex  = (readl(&regs->wIndexH)  << 8) | readl(&regs->wIndexL);
1532         ctrl.wLength = (readl(&regs->wLengthH) << 8) | readl(&regs->wLengthL);
1533         writel(0, &regs->SetupRecv);
1534
1535         nuke(&dev->ep[0], 0);
1536         dev->ep[0].stopped = 0;
1537         if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1538                 dev->ep[0].is_in = 1;
1539                 dev->ep0state = EP0_IN;
1540                 /* detect early status stages */
1541                 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1542         } else {
1543                 dev->ep[0].is_in = 0;
1544                 dev->ep0state = EP0_OUT;
1545
1546                 /* NOTE:  CLEAR_FEATURE is done in software so that we can
1547                  * synchronize transfer restarts after bulk IN stalls.  data
1548                  * won't even enter the fifo until the halt is cleared.
1549                  */
1550                 switch (ctrl.bRequest) {
1551                 case USB_REQ_CLEAR_FEATURE:
1552                         switch (ctrl.bRequestType) {
1553                         case USB_RECIP_ENDPOINT:
1554                                 tmp = ctrl.wIndex & 0x0f;
1555                                 /* active endpoint */
1556                                 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1557                                         goto stall;
1558                                 if (ctrl.wIndex & 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 != USB_ENDPOINT_HALT)
1566                                         goto stall;
1567                                 if (tmp)
1568                                         goku_clear_halt(&dev->ep[tmp]);
1569 succeed:
1570                                 /* start ep0out status stage */
1571                                 writel(~(1<<0), &regs->EOP);
1572                                 dev->ep[0].stopped = 1;
1573                                 dev->ep0state = EP0_STATUS;
1574                                 return;
1575                         case USB_RECIP_DEVICE:
1576                                 /* device remote wakeup: always clear */
1577                                 if (ctrl.wValue != 1)
1578                                         goto stall;
1579                                 VDBG(dev, "clear dev remote wakeup\n");
1580                                 goto succeed;
1581                         case USB_RECIP_INTERFACE:
1582                                 goto stall;
1583                         default:                /* pass to gadget driver */
1584                                 break;
1585                         }
1586                         break;
1587                 default:
1588                         break;
1589                 }
1590         }
1591
1592 #ifdef USB_TRACE
1593         VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1594                 ctrl.bRequestType, ctrl.bRequest,
1595                 ctrl.wValue, ctrl.wIndex, ctrl.wLength);
1596 #endif
1597
1598         /* hw wants to know when we're configured (or not) */
1599         dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1600                                 && ctrl.bRequestType == USB_RECIP_DEVICE);
1601         if (unlikely(dev->req_config))
1602                 dev->configured = (ctrl.wValue != 0);
1603
1604         /* delegate everything to the gadget driver.
1605          * it may respond after this irq handler returns.
1606          */
1607         spin_unlock (&dev->lock);
1608         tmp = dev->driver->setup(&dev->gadget, &ctrl);
1609         spin_lock (&dev->lock);
1610         if (unlikely(tmp < 0)) {
1611 stall:
1612 #ifdef USB_TRACE
1613                 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1614                                 ctrl.bRequestType, ctrl.bRequest, tmp);
1615 #endif
1616                 command(regs, COMMAND_STALL, 0);
1617                 dev->ep[0].stopped = 1;
1618                 dev->ep0state = EP0_STALL;
1619         }
1620
1621         /* expect at least one data or status stage irq */
1622 }
1623
1624 #define ACK(irqbit) { \
1625                 stat &= ~irqbit; \
1626                 writel(~irqbit, &regs->int_status); \
1627                 handled = 1; \
1628                 }
1629
1630 static irqreturn_t goku_irq(int irq, void *_dev, struct pt_regs *r)
1631 {
1632         struct goku_udc         *dev = _dev;
1633         struct goku_udc_regs    *regs = dev->regs;
1634         struct goku_ep          *ep;
1635         u32                     stat, handled = 0;
1636         unsigned                i, rescans = 5;
1637
1638         spin_lock(&dev->lock);
1639
1640 rescan:
1641         stat = readl(&regs->int_status) & dev->int_enable;
1642         if (!stat)
1643                 goto done;
1644         dev->irqs++;
1645
1646         /* device-wide irqs */
1647         if (unlikely(stat & INT_DEVWIDE)) {
1648                 if (stat & INT_SYSERROR) {
1649                         ERROR(dev, "system error\n");
1650                         stop_activity(dev, dev->driver);
1651                         stat = 0;
1652                         handled = 1;
1653                         // FIXME have a neater way to prevent re-enumeration
1654                         dev->driver = 0;
1655                         goto done;
1656                 }
1657                 if (stat & INT_PWRDETECT) {
1658                         writel(~stat, &regs->int_status);
1659                         if (readl(&dev->regs->power_detect) & PW_DETECT) {
1660                                 VDBG(dev, "connect\n");
1661                                 ep0_start(dev);
1662                         } else {
1663                                 DBG(dev, "disconnect\n");
1664                                 if (dev->gadget.speed == USB_SPEED_FULL)
1665                                         stop_activity(dev, dev->driver);
1666                                 dev->ep0state = EP0_DISCONNECT;
1667                                 dev->int_enable = INT_DEVWIDE;
1668                                 writel(dev->int_enable, &dev->regs->int_enable);
1669                         }
1670                         stat = 0;
1671                         handled = 1;
1672                         goto done;
1673                 }
1674                 if (stat & INT_SUSPEND) {
1675                         ACK(INT_SUSPEND);
1676                         if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1677                                 switch (dev->ep0state) {
1678                                 case EP0_DISCONNECT:
1679                                 case EP0_SUSPEND:
1680                                         goto pm_next;
1681                                 default:
1682                                         break;
1683                                 }
1684                                 DBG(dev, "USB suspend\n");
1685                                 dev->ep0state = EP0_SUSPEND;
1686                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1687                                                 && dev->driver
1688                                                 && dev->driver->suspend) {
1689                                         spin_unlock(&dev->lock);
1690                                         dev->driver->suspend(&dev->gadget);
1691                                         spin_lock(&dev->lock);
1692                                 }
1693                         } else {
1694                                 if (dev->ep0state != EP0_SUSPEND) {
1695                                         DBG(dev, "bogus USB resume %d\n",
1696                                                 dev->ep0state);
1697                                         goto pm_next;
1698                                 }
1699                                 DBG(dev, "USB resume\n");
1700                                 dev->ep0state = EP0_IDLE;
1701                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1702                                                 && dev->driver
1703                                                 && dev->driver->resume) {
1704                                         spin_unlock(&dev->lock);
1705                                         dev->driver->resume(&dev->gadget);
1706                                         spin_lock(&dev->lock);
1707                                 }
1708                         }
1709                 }
1710 pm_next:
1711                 if (stat & INT_USBRESET) {              /* hub reset done */
1712                         ACK(INT_USBRESET);
1713                         INFO(dev, "USB reset done, gadget %s\n",
1714                                 dev->driver->driver.name);
1715                 }
1716                 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1717         }
1718
1719         /* progress ep0 setup, data, or status stages.
1720          * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1721          */
1722         if (stat & INT_SETUP) {
1723                 ACK(INT_SETUP);
1724                 dev->ep[0].irqs++;
1725                 ep0_setup(dev);
1726         }
1727         if (stat & INT_STATUSNAK) {
1728                 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1729                 if (dev->ep0state == EP0_IN) {
1730                         ep = &dev->ep[0];
1731                         ep->irqs++;
1732                         nuke(ep, 0);
1733                         writel(~(1<<0), &regs->EOP);
1734                         dev->ep0state = EP0_STATUS;
1735                 }
1736         }
1737         if (stat & INT_ENDPOINT0) {
1738                 ACK(INT_ENDPOINT0);
1739                 ep = &dev->ep[0];
1740                 ep->irqs++;
1741                 pio_advance(ep);
1742         }
1743
1744         /* dma completion */
1745         if (stat & INT_MSTRDEND) {      /* IN */
1746                 ACK(INT_MSTRDEND);
1747                 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1748                 ep->irqs++;
1749                 dma_advance(dev, ep);
1750         }
1751         if (stat & INT_MSTWREND) {      /* OUT */
1752                 ACK(INT_MSTWREND);
1753                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1754                 ep->irqs++;
1755                 dma_advance(dev, ep);
1756         }
1757         if (stat & INT_MSTWRTMOUT) {    /* OUT */
1758                 ACK(INT_MSTWRTMOUT);
1759                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1760                 ep->irqs++;
1761                 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1762                 // reset dma? then dma_advance()
1763         }
1764
1765         /* pio */
1766         for (i = 1; i < 4; i++) {
1767                 u32             tmp = INT_EPxDATASET(i);
1768
1769                 if (!(stat & tmp))
1770                         continue;
1771                 ep = &dev->ep[i];
1772                 pio_advance(ep);
1773                 if (list_empty (&ep->queue))
1774                         pio_irq_disable(dev, regs, i);
1775                 stat &= ~tmp;
1776                 handled = 1;
1777                 ep->irqs++;
1778         }
1779
1780         if (rescans--)
1781                 goto rescan;
1782
1783 done:
1784         (void)readl(&regs->int_enable);
1785         spin_unlock(&dev->lock);
1786         if (stat)
1787                 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1788                                 readl(&regs->int_status), dev->int_enable);
1789         return IRQ_RETVAL(handled);
1790 }
1791
1792 #undef ACK
1793
1794 /*-------------------------------------------------------------------------*/
1795
1796 static void gadget_release(struct device *_dev)
1797 {
1798         struct goku_udc *dev = dev_get_drvdata(_dev);
1799
1800         kfree(dev);
1801 }
1802
1803 /* tear down the binding between this driver and the pci device */
1804
1805 static void goku_remove(struct pci_dev *pdev)
1806 {
1807         struct goku_udc         *dev = pci_get_drvdata(pdev);
1808
1809         DBG(dev, "%s\n", __FUNCTION__);
1810         /* start with the driver above us */
1811         if (dev->driver) {
1812                 /* should have been done already by driver model core */
1813                 WARN(dev, "pci remove, driver '%s' is still registered\n",
1814                                 dev->driver->driver.name);
1815                 usb_gadget_unregister_driver(dev->driver);
1816         }
1817
1818 #ifdef  UDC_PROC_FILE
1819         remove_proc_entry(proc_node_name, NULL);
1820 #endif
1821         if (dev->regs)
1822                 udc_reset(dev);
1823         if (dev->got_irq)
1824                 free_irq(pdev->irq, dev);
1825         if (dev->regs)
1826                 iounmap(dev->regs);
1827         if (dev->got_region)
1828                 release_mem_region(pci_resource_start (pdev, 0),
1829                                 pci_resource_len (pdev, 0));
1830         if (dev->enabled)
1831                 pci_disable_device(pdev);
1832         device_unregister(&dev->gadget.dev);
1833
1834         pci_set_drvdata(pdev, 0);
1835         dev->regs = 0;
1836         the_controller = 0;
1837
1838         INFO(dev, "unbind\n");
1839 }
1840
1841 /* wrap this driver around the specified pci device, but
1842  * don't respond over USB until a gadget driver binds to us.
1843  */
1844
1845 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1846 {
1847         struct goku_udc         *dev = 0;
1848         unsigned long           resource, len;
1849         void                    *base = 0;
1850         int                     retval;
1851         char                    buf [8], *bufp;
1852
1853         /* if you want to support more than one controller in a system,
1854          * usb_gadget_driver_{register,unregister}() must change.
1855          */
1856         if (the_controller) {
1857                 WARN(dev, "ignoring %s\n", pci_name(pdev));
1858                 return -EBUSY;
1859         }
1860         if (!pdev->irq) {
1861                 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1862                 retval = -ENODEV;
1863                 goto done;
1864         }
1865
1866         /* alloc, and start init */
1867         dev = kmalloc (sizeof *dev, SLAB_KERNEL);
1868         if (dev == NULL){
1869                 pr_debug("enomem %s\n", pci_name(pdev));
1870                 retval = -ENOMEM;
1871                 goto done;
1872         }
1873
1874         memset(dev, 0, sizeof *dev);
1875         spin_lock_init(&dev->lock);
1876         dev->pdev = pdev;
1877         dev->gadget.ops = &goku_ops;
1878
1879         /* the "gadget" abstracts/virtualizes the controller */
1880         strcpy(dev->gadget.dev.bus_id, "gadget");
1881         dev->gadget.dev.parent = &pdev->dev;
1882         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1883         dev->gadget.dev.release = gadget_release;
1884         dev->gadget.name = driver_name;
1885
1886         /* now all the pci goodies ... */
1887         retval = pci_enable_device(pdev);
1888         if (retval < 0) {
1889                 DBG(dev, "can't enable, %d\n", retval);
1890                 goto done;
1891         }
1892         dev->enabled = 1;
1893
1894         resource = pci_resource_start(pdev, 0);
1895         len = pci_resource_len(pdev, 0);
1896         if (!request_mem_region(resource, len, driver_name)) {
1897                 DBG(dev, "controller already in use\n");
1898                 retval = -EBUSY;
1899                 goto done;
1900         }
1901         dev->got_region = 1;
1902
1903         base = ioremap_nocache(resource, len);
1904         if (base == NULL) {
1905                 DBG(dev, "can't map memory\n");
1906                 retval = -EFAULT;
1907                 goto done;
1908         }
1909         dev->regs = (struct goku_udc_regs *) base;
1910
1911         pci_set_drvdata(pdev, dev);
1912         INFO(dev, "%s\n", driver_desc);
1913         INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1914 #ifndef __sparc__
1915         scnprintf(buf, sizeof buf, "%d", pdev->irq);
1916         bufp = buf;
1917 #else
1918         bufp = __irq_itoa(pdev->irq);
1919 #endif
1920         INFO(dev, "irq %s, pci mem %p\n", bufp, base);
1921
1922         /* init to known state, then setup irqs */
1923         udc_reset(dev);
1924         udc_reinit (dev);
1925         if (request_irq(pdev->irq, goku_irq, SA_SHIRQ/*|SA_SAMPLE_RANDOM*/,
1926                         driver_name, dev) != 0) {
1927                 DBG(dev, "request interrupt %s failed\n", bufp);
1928                 retval = -EBUSY;
1929                 goto done;
1930         }
1931         dev->got_irq = 1;
1932         if (use_dma)
1933                 pci_set_master(pdev);
1934
1935
1936 #ifdef  UDC_PROC_FILE
1937         create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1938 #endif
1939
1940         /* done */
1941         the_controller = dev;
1942         device_register(&dev->gadget.dev);
1943
1944         return 0;
1945
1946 done:
1947         if (dev)
1948                 goku_remove (pdev);
1949         return retval;
1950 }
1951
1952
1953 /*-------------------------------------------------------------------------*/
1954
1955 static struct pci_device_id pci_ids [] = { {
1956         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1957         .class_mask =   ~0,
1958         .vendor =       0x102f,         /* Toshiba */
1959         .device =       0x0107,         /* this UDC */
1960         .subvendor =    PCI_ANY_ID,
1961         .subdevice =    PCI_ANY_ID,
1962
1963 }, { /* end: all zeroes */ }
1964 };
1965 MODULE_DEVICE_TABLE (pci, pci_ids);
1966
1967 static struct pci_driver goku_pci_driver = {
1968         .name =         (char *) driver_name,
1969         .id_table =     pci_ids,
1970
1971         .probe =        goku_probe,
1972         .remove =       goku_remove,
1973
1974         /* FIXME add power management support */
1975 };
1976
1977 static int __init init (void)
1978 {
1979         return pci_module_init (&goku_pci_driver);
1980 }
1981 module_init (init);
1982
1983 static void __exit cleanup (void)
1984 {
1985         pci_unregister_driver (&goku_pci_driver);
1986 }
1987 module_exit (cleanup);