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

   1 /*
   2  * Toshiba TC86C001 ("Goku-S") USB Device Controller driver
   3  *
   4  * Copyright (C) 2000-2002 Lineo
   5  *      by Stuart Lynne, Tom Rushworth, and Bruce Balden
   6  * Copyright (C) 2002 Toshiba Corporation
   7  * Copyright (C) 2003 MontaVista Software (source@mvista.com)
   8  *
   9  * This file is licensed under the terms of the GNU General Public
  10  * License version 2.  This program is licensed "as is" without any
  11  * warranty of any kind, whether express or implied.
  12  */
  13
  14 /*
  15  * This device has ep0 and three semi-configurable bulk/interrupt endpoints.
  16  *
  17  *  - Endpoint numbering is fixed: ep{1,2,3}-bulk
  18  *  - Gadget drivers can choose ep maxpacket (8/16/32/64)
  19  *  - Gadget drivers can choose direction (IN, OUT)
  20  *  - DMA works with ep1 (OUT transfers) and ep2 (IN transfers).
  21  */
  22
  23 // #define      VERBOSE         /* extra debug messages (success too) */
  24 // #define      USB_TRACE       /* packet-level success messages */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/pci.h>
  29 #include <linux/delay.h>
  30 #include <linux/ioport.h>
  31 #include <linux/slab.h>
  32 #include <linux/errno.h>
  33 #include <linux/init.h>
  34 #include <linux/timer.h>
  35 #include <linux/list.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/device.h>
  39 #include <linux/usb/ch9.h>
  40 #include <linux/usb/gadget.h>
  41
  42 #include <asm/byteorder.h>
  43 #include <asm/io.h>
  44 #include <asm/irq.h>
  45 #include <asm/system.h>
  46 #include <asm/unaligned.h>
  47
  48
  49 #include "goku_udc.h"
  50
  51 #define DRIVER_DESC             "TC86C001 USB Device Controller"
  52 #define DRIVER_VERSION          "30-Oct 2003"
  53
  54 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
  55
  56 static const char driver_name [] = "goku_udc";
  57 static const char driver_desc [] = DRIVER_DESC;
  58
  59 MODULE_AUTHOR("source@mvista.com");
  60 MODULE_DESCRIPTION(DRIVER_DESC);
  61 MODULE_LICENSE("GPL");
  62
  63
  64 /*
  65  * IN dma behaves ok under testing, though the IN-dma abort paths don't
  66  * seem to behave quite as expected.  Used by default.
  67  *
  68  * OUT dma documents design problems handling the common "short packet"
  69  * transfer termination policy; it couldn't be enabled by default, even
  70  * if the OUT-dma abort problems had a resolution.
  71  */
  72 static unsigned use_dma = 1;
  73
  74 #if 0
  75 //#include <linux/moduleparam.h>
  76 /* "modprobe goku_udc use_dma=1" etc
  77  *      0 to disable dma
  78  *      1 to use IN dma only (normal operation)
  79  *      2 to use IN and OUT dma
  80  */
  81 module_param(use_dma, uint, S_IRUGO);
  82 #endif
  83
  84 /*-------------------------------------------------------------------------*/
  85
  86 static void nuke(struct goku_ep *, int status);
  87
  88 static inline void
  89 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
  90 {
  91         writel(COMMAND_EP(epnum) | command, &regs->Command);
  92         udelay(300);
  93 }
  94
  95 static int
  96 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
  97 {
  98         struct goku_udc *dev;
  99         struct goku_ep  *ep;
 100         u32             mode;
 101         u16             max;
 102         unsigned long   flags;
 103
 104         ep = container_of(_ep, struct goku_ep, ep);
 105         if (!_ep || !desc || ep->desc
 106                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 107                 return -EINVAL;
 108         dev = ep->dev;
 109         if (ep == &dev->ep[0])
 110                 return -EINVAL;
 111         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 112                 return -ESHUTDOWN;
 113         if (ep->num != (desc->bEndpointAddress & 0x0f))
 114                 return -EINVAL;
 115
 116         switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 117         case USB_ENDPOINT_XFER_BULK:
 118         case USB_ENDPOINT_XFER_INT:
 119                 break;
 120         default:
 121                 return -EINVAL;
 122         }
 123
 124         if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
 125                         != EPxSTATUS_EP_INVALID)
 126                 return -EBUSY;
 127
 128         /* enabling the no-toggle interrupt mode would need an api hook */
 129         mode = 0;
 130         max = get_unaligned_le16(&desc->wMaxPacketSize);
 131         switch (max) {
 132         case 64:        mode++;
 133         case 32:        mode++;
 134         case 16:        mode++;
 135         case 8:         mode <<= 3;
 136                         break;
 137         default:
 138                 return -EINVAL;
 139         }
 140         mode |= 2 << 1;         /* bulk, or intr-with-toggle */
 141
 142         /* ep1/ep2 dma direction is chosen early; it works in the other
 143          * direction, with pio.  be cautious with out-dma.
 144          */
 145         ep->is_in = (USB_DIR_IN & desc->bEndpointAddress) != 0;
 146         if (ep->is_in) {
 147                 mode |= 1;
 148                 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
 149         } else {
 150                 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
 151                 if (ep->dma)
 152                         DBG(dev, "%s out-dma hides short packets\n",
 153                                 ep->ep.name);
 154         }
 155
 156         spin_lock_irqsave(&ep->dev->lock, flags);
 157
 158         /* ep1 and ep2 can do double buffering and/or dma */
 159         if (ep->num < 3) {
 160                 struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 161                 u32                             tmp;
 162
 163                 /* double buffer except (for now) with pio in */
 164                 tmp = ((ep->dma || !ep->is_in)
 165                                 ? 0x10  /* double buffered */
 166                                 : 0x11  /* single buffer */
 167                         ) << ep->num;
 168                 tmp |= readl(&regs->EPxSingle);
 169                 writel(tmp, &regs->EPxSingle);
 170
 171                 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
 172                 tmp |= readl(&regs->EPxBCS);
 173                 writel(tmp, &regs->EPxBCS);
 174         }
 175         writel(mode, ep->reg_mode);
 176         command(ep->dev->regs, COMMAND_RESET, ep->num);
 177         ep->ep.maxpacket = max;
 178         ep->stopped = 0;
 179         ep->desc = desc;
 180         spin_unlock_irqrestore(&ep->dev->lock, flags);
 181
 182         DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
 183                 ep->is_in ? "IN" : "OUT",
 184                 ep->dma ? "dma" : "pio",
 185                 max);
 186
 187         return 0;
 188 }
 189
 190 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
 191 {
 192         struct goku_udc         *dev = ep->dev;
 193
 194         if (regs) {
 195                 command(regs, COMMAND_INVALID, ep->num);
 196                 if (ep->num) {
 197                         if (ep->num == UDC_MSTWR_ENDPOINT)
 198                                 dev->int_enable &= ~(INT_MSTWREND
 199                                                         |INT_MSTWRTMOUT);
 200                         else if (ep->num == UDC_MSTRD_ENDPOINT)
 201                                 dev->int_enable &= ~INT_MSTRDEND;
 202                         dev->int_enable &= ~INT_EPxDATASET (ep->num);
 203                 } else
 204                         dev->int_enable &= ~INT_EP0;
 205                 writel(dev->int_enable, &regs->int_enable);
 206                 readl(&regs->int_enable);
 207                 if (ep->num < 3) {
 208                         struct goku_udc_regs __iomem    *r = ep->dev->regs;
 209                         u32                             tmp;
 210
 211                         tmp = readl(&r->EPxSingle);
 212                         tmp &= ~(0x11 << ep->num);
 213                         writel(tmp, &r->EPxSingle);
 214
 215                         tmp = readl(&r->EPxBCS);
 216                         tmp &= ~(0x11 << ep->num);
 217                         writel(tmp, &r->EPxBCS);
 218                 }
 219                 /* reset dma in case we're still using it */
 220                 if (ep->dma) {
 221                         u32     master;
 222
 223                         master = readl(&regs->dma_master) & MST_RW_BITS;
 224                         if (ep->num == UDC_MSTWR_ENDPOINT) {
 225                                 master &= ~MST_W_BITS;
 226                                 master |= MST_WR_RESET;
 227                         } else {
 228                                 master &= ~MST_R_BITS;
 229                                 master |= MST_RD_RESET;
 230                         }
 231                         writel(master, &regs->dma_master);
 232                 }
 233         }
 234
 235         ep->ep.maxpacket = MAX_FIFO_SIZE;
 236         ep->desc = NULL;
 237         ep->stopped = 1;
 238         ep->irqs = 0;
 239         ep->dma = 0;
 240 }
 241
 242 static int goku_ep_disable(struct usb_ep *_ep)
 243 {
 244         struct goku_ep  *ep;
 245         struct goku_udc *dev;
 246         unsigned long   flags;
 247
 248         ep = container_of(_ep, struct goku_ep, ep);
 249         if (!_ep || !ep->desc)
 250                 return -ENODEV;
 251         dev = ep->dev;
 252         if (dev->ep0state == EP0_SUSPEND)
 253                 return -EBUSY;
 254
 255         VDBG(dev, "disable %s\n", _ep->name);
 256
 257         spin_lock_irqsave(&dev->lock, flags);
 258         nuke(ep, -ESHUTDOWN);
 259         ep_reset(dev->regs, ep);
 260         spin_unlock_irqrestore(&dev->lock, flags);
 261
 262         return 0;
 263 }
 264
 265 /*-------------------------------------------------------------------------*/
 266
 267 static struct usb_request *
 268 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 269 {
 270         struct goku_request     *req;
 271
 272         if (!_ep)
 273                 return NULL;
 274         req = kzalloc(sizeof *req, gfp_flags);
 275         if (!req)
 276                 return NULL;
 277
 278         req->req.dma = DMA_ADDR_INVALID;
 279         INIT_LIST_HEAD(&req->queue);
 280         return &req->req;
 281 }
 282
 283 static void
 284 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
 285 {
 286         struct goku_request     *req;
 287
 288         if (!_ep || !_req)
 289                 return;
 290
 291         req = container_of(_req, struct goku_request, req);
 292         WARN_ON(!list_empty(&req->queue));
 293         kfree(req);
 294 }
 295
 296 /*-------------------------------------------------------------------------*/
 297
 298 static void
 299 done(struct goku_ep *ep, struct goku_request *req, int status)
 300 {
 301         struct goku_udc         *dev;
 302         unsigned                stopped = ep->stopped;
 303
 304         list_del_init(&req->queue);
 305
 306         if (likely(req->req.status == -EINPROGRESS))
 307                 req->req.status = status;
 308         else
 309                 status = req->req.status;
 310
 311         dev = ep->dev;
 312         if (req->mapped) {
 313                 pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
 314                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 315                 req->req.dma = DMA_ADDR_INVALID;
 316                 req->mapped = 0;
 317         }
 318
 319 #ifndef USB_TRACE
 320         if (status && status != -ESHUTDOWN)
 321 #endif
 322                 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
 323                         ep->ep.name, &req->req, status,
 324                         req->req.actual, req->req.length);
 325
 326         /* don't modify queue heads during completion callback */
 327         ep->stopped = 1;
 328         spin_unlock(&dev->lock);
 329         req->req.complete(&ep->ep, &req->req);
 330         spin_lock(&dev->lock);
 331         ep->stopped = stopped;
 332 }
 333
 334 /*-------------------------------------------------------------------------*/
 335
 336 static inline int
 337 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
 338 {
 339         unsigned        length, count;
 340
 341         length = min(req->req.length - req->req.actual, max);
 342         req->req.actual += length;
 343
 344         count = length;
 345         while (likely(count--))
 346                 writel(*buf++, fifo);
 347         return length;
 348 }
 349
 350 // return:  0 = still running, 1 = completed, negative = errno
 351 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
 352 {
 353         struct goku_udc *dev = ep->dev;
 354         u32             tmp;
 355         u8              *buf;
 356         unsigned        count;
 357         int             is_last;
 358
 359         tmp = readl(&dev->regs->DataSet);
 360         buf = req->req.buf + req->req.actual;
 361         prefetch(buf);
 362
 363         dev = ep->dev;
 364         if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
 365                 return -EL2HLT;
 366
 367         /* NOTE:  just single-buffered PIO-IN for now.  */
 368         if (unlikely((tmp & DATASET_A(ep->num)) != 0))
 369                 return 0;
 370
 371         /* clear our "packet available" irq */
 372         if (ep->num != 0)
 373                 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
 374
 375         count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
 376
 377         /* last packet often short (sometimes a zlp, especially on ep0) */
 378         if (unlikely(count != ep->ep.maxpacket)) {
 379                 writel(~(1<<ep->num), &dev->regs->EOP);
 380                 if (ep->num == 0) {
 381                         dev->ep[0].stopped = 1;
 382                         dev->ep0state = EP0_STATUS;
 383                 }
 384                 is_last = 1;
 385         } else {
 386                 if (likely(req->req.length != req->req.actual)
 387                                 || req->req.zero)
 388                         is_last = 0;
 389                 else
 390                         is_last = 1;
 391         }
 392 #if 0           /* printk seemed to trash is_last...*/
 393 //#ifdef USB_TRACE
 394         VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
 395                 ep->ep.name, count, is_last ? "/last" : "",
 396                 req->req.length - req->req.actual, req);
 397 #endif
 398
 399         /* requests complete when all IN data is in the FIFO,
 400          * or sometimes later, if a zlp was needed.
 401          */
 402         if (is_last) {
 403                 done(ep, req, 0);
 404                 return 1;
 405         }
 406
 407         return 0;
 408 }
 409
 410 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
 411 {
 412         struct goku_udc_regs __iomem    *regs;
 413         u32                             size, set;
 414         u8                              *buf;
 415         unsigned                        bufferspace, is_short, dbuff;
 416
 417         regs = ep->dev->regs;
 418 top:
 419         buf = req->req.buf + req->req.actual;
 420         prefetchw(buf);
 421
 422         if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
 423                 return -EL2HLT;
 424
 425         dbuff = (ep->num == 1 || ep->num == 2);
 426         do {
 427                 /* ack dataset irq matching the status we'll handle */
 428                 if (ep->num != 0)
 429                         writel(~INT_EPxDATASET(ep->num), &regs->int_status);
 430
 431                 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
 432                 size = readl(&regs->EPxSizeLA[ep->num]);
 433                 bufferspace = req->req.length - req->req.actual;
 434
 435                 /* usually do nothing without an OUT packet */
 436                 if (likely(ep->num != 0 || bufferspace != 0)) {
 437                         if (unlikely(set == 0))
 438                                 break;
 439                         /* use ep1/ep2 double-buffering for OUT */
 440                         if (!(size & PACKET_ACTIVE))
 441                                 size = readl(&regs->EPxSizeLB[ep->num]);
 442                         if (!(size & PACKET_ACTIVE))    /* "can't happen" */
 443                                 break;
 444                         size &= DATASIZE;       /* EPxSizeH == 0 */
 445
 446                 /* ep0out no-out-data case for set_config, etc */
 447                 } else
 448                         size = 0;
 449
 450                 /* read all bytes from this packet */
 451                 req->req.actual += size;
 452                 is_short = (size < ep->ep.maxpacket);
 453 #ifdef USB_TRACE
 454                 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
 455                         ep->ep.name, size, is_short ? "/S" : "",
 456                         req, req->req.actual, req->req.length);
 457 #endif
 458                 while (likely(size-- != 0)) {
 459                         u8      byte = (u8) readl(ep->reg_fifo);
 460
 461                         if (unlikely(bufferspace == 0)) {
 462                                 /* this happens when the driver's buffer
 463                                  * is smaller than what the host sent.
 464                                  * discard the extra data in this packet.
 465                                  */
 466                                 if (req->req.status != -EOVERFLOW)
 467                                         DBG(ep->dev, "%s overflow %u\n",
 468                                                 ep->ep.name, size);
 469                                 req->req.status = -EOVERFLOW;
 470                         } else {
 471                                 *buf++ = byte;
 472                                 bufferspace--;
 473                         }
 474                 }
 475
 476                 /* completion */
 477                 if (unlikely(is_short || req->req.actual == req->req.length)) {
 478                         if (unlikely(ep->num == 0)) {
 479                                 /* non-control endpoints now usable? */
 480                                 if (ep->dev->req_config)
 481                                         writel(ep->dev->configured
 482                                                         ? USBSTATE_CONFIGURED
 483                                                         : 0,
 484                                                 &regs->UsbState);
 485                                 /* ep0out status stage */
 486                                 writel(~(1<<0), &regs->EOP);
 487                                 ep->stopped = 1;
 488                                 ep->dev->ep0state = EP0_STATUS;
 489                         }
 490                         done(ep, req, 0);
 491
 492                         /* empty the second buffer asap */
 493                         if (dbuff && !list_empty(&ep->queue)) {
 494                                 req = list_entry(ep->queue.next,
 495                                                 struct goku_request, queue);
 496                                 goto top;
 497                         }
 498                         return 1;
 499                 }
 500         } while (dbuff);
 501         return 0;
 502 }
 503
 504 static inline void
 505 pio_irq_enable(struct goku_udc *dev,
 506                 struct goku_udc_regs __iomem *regs, int epnum)
 507 {
 508         dev->int_enable |= INT_EPxDATASET (epnum);
 509         writel(dev->int_enable, &regs->int_enable);
 510         /* write may still be posted */
 511 }
 512
 513 static inline void
 514 pio_irq_disable(struct goku_udc *dev,
 515                 struct goku_udc_regs __iomem *regs, int epnum)
 516 {
 517         dev->int_enable &= ~INT_EPxDATASET (epnum);
 518         writel(dev->int_enable, &regs->int_enable);
 519         /* write may still be posted */
 520 }
 521
 522 static inline void
 523 pio_advance(struct goku_ep *ep)
 524 {
 525         struct goku_request     *req;
 526
 527         if (unlikely(list_empty (&ep->queue)))
 528                 return;
 529         req = list_entry(ep->queue.next, struct goku_request, queue);
 530         (ep->is_in ? write_fifo : read_fifo)(ep, req);
 531 }
 532
 533
 534 /*-------------------------------------------------------------------------*/
 535
 536 // return:  0 = q running, 1 = q stopped, negative = errno
 537 static int start_dma(struct goku_ep *ep, struct goku_request *req)
 538 {
 539         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 540         u32                             master;
 541         u32                             start = req->req.dma;
 542         u32                             end = start + req->req.length - 1;
 543
 544         master = readl(&regs->dma_master) & MST_RW_BITS;
 545
 546         /* re-init the bits affecting IN dma; careful with zlps */
 547         if (likely(ep->is_in)) {
 548                 if (unlikely(master & MST_RD_ENA)) {
 549                         DBG (ep->dev, "start, IN active dma %03x!!\n",
 550                                 master);
 551 //                      return -EL2HLT;
 552                 }
 553                 writel(end, &regs->in_dma_end);
 554                 writel(start, &regs->in_dma_start);
 555
 556                 master &= ~MST_R_BITS;
 557                 if (unlikely(req->req.length == 0))
 558                         master = MST_RD_ENA | MST_RD_EOPB;
 559                 else if ((req->req.length % ep->ep.maxpacket) != 0
 560                                         || req->req.zero)
 561                         master = MST_RD_ENA | MST_EOPB_ENA;
 562                 else
 563                         master = MST_RD_ENA | MST_EOPB_DIS;
 564
 565                 ep->dev->int_enable |= INT_MSTRDEND;
 566
 567         /* Goku DMA-OUT merges short packets, which plays poorly with
 568          * protocols where short packets mark the transfer boundaries.
 569          * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
 570          * ending transfers after 3 SOFs; we don't turn it on.
 571          */
 572         } else {
 573                 if (unlikely(master & MST_WR_ENA)) {
 574                         DBG (ep->dev, "start, OUT active dma %03x!!\n",
 575                                 master);
 576 //                      return -EL2HLT;
 577                 }
 578                 writel(end, &regs->out_dma_end);
 579                 writel(start, &regs->out_dma_start);
 580
 581                 master &= ~MST_W_BITS;
 582                 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
 583
 584                 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
 585         }
 586
 587         writel(master, &regs->dma_master);
 588         writel(ep->dev->int_enable, &regs->int_enable);
 589         return 0;
 590 }
 591
 592 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
 593 {
 594         struct goku_request             *req;
 595         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 596         u32                             master;
 597
 598         master = readl(&regs->dma_master);
 599
 600         if (unlikely(list_empty(&ep->queue))) {
 601 stop:
 602                 if (ep->is_in)
 603                         dev->int_enable &= ~INT_MSTRDEND;
 604                 else
 605                         dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
 606                 writel(dev->int_enable, &regs->int_enable);
 607                 return;
 608         }
 609         req = list_entry(ep->queue.next, struct goku_request, queue);
 610
 611         /* normal hw dma completion (not abort) */
 612         if (likely(ep->is_in)) {
 613                 if (unlikely(master & MST_RD_ENA))
 614                         return;
 615                 req->req.actual = readl(&regs->in_dma_current);
 616         } else {
 617                 if (unlikely(master & MST_WR_ENA))
 618                         return;
 619
 620                 /* hardware merges short packets, and also hides packet
 621                  * overruns.  a partial packet MAY be in the fifo here.
 622                  */
 623                 req->req.actual = readl(&regs->out_dma_current);
 624         }
 625         req->req.actual -= req->req.dma;
 626         req->req.actual++;
 627
 628 #ifdef USB_TRACE
 629         VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
 630                 ep->ep.name, ep->is_in ? "IN" : "OUT",
 631                 req->req.actual, req->req.length, req);
 632 #endif
 633         done(ep, req, 0);
 634         if (list_empty(&ep->queue))
 635                 goto stop;
 636         req = list_entry(ep->queue.next, struct goku_request, queue);
 637         (void) start_dma(ep, req);
 638 }
 639
 640 static void abort_dma(struct goku_ep *ep, int status)
 641 {
 642         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 643         struct goku_request             *req;
 644         u32                             curr, master;
 645
 646         /* NAK future host requests, hoping the implicit delay lets the
 647          * dma engine finish reading (or writing) its latest packet and
 648          * empty the dma buffer (up to 16 bytes).
 649          *
 650          * This avoids needing to clean up a partial packet in the fifo;
 651          * we can't do that for IN without side effects to HALT and TOGGLE.
 652          */
 653         command(regs, COMMAND_FIFO_DISABLE, ep->num);
 654         req = list_entry(ep->queue.next, struct goku_request, queue);
 655         master = readl(&regs->dma_master) & MST_RW_BITS;
 656
 657         /* FIXME using these resets isn't usably documented. this may
 658          * not work unless it's followed by disabling the endpoint.
 659          *
 660          * FIXME the OUT reset path doesn't even behave consistently.
 661          */
 662         if (ep->is_in) {
 663                 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
 664                         goto finished;
 665                 curr = readl(&regs->in_dma_current);
 666
 667                 writel(curr, &regs->in_dma_end);
 668                 writel(curr, &regs->in_dma_start);
 669
 670                 master &= ~MST_R_BITS;
 671                 master |= MST_RD_RESET;
 672                 writel(master, &regs->dma_master);
 673
 674                 if (readl(&regs->dma_master) & MST_RD_ENA)
 675                         DBG(ep->dev, "IN dma active after reset!\n");
 676
 677         } else {
 678                 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
 679                         goto finished;
 680                 curr = readl(&regs->out_dma_current);
 681
 682                 writel(curr, &regs->out_dma_end);
 683                 writel(curr, &regs->out_dma_start);
 684
 685                 master &= ~MST_W_BITS;
 686                 master |= MST_WR_RESET;
 687                 writel(master, &regs->dma_master);
 688
 689                 if (readl(&regs->dma_master) & MST_WR_ENA)
 690                         DBG(ep->dev, "OUT dma active after reset!\n");
 691         }
 692         req->req.actual = (curr - req->req.dma) + 1;
 693         req->req.status = status;
 694
 695         VDBG(ep->dev, "%s %s %s %d/%d\n", __func__, ep->ep.name,
 696                 ep->is_in ? "IN" : "OUT",
 697                 req->req.actual, req->req.length);
 698
 699         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 700
 701         return;
 702
 703 finished:
 704         /* dma already completed; no abort needed */
 705         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 706         req->req.actual = req->req.length;
 707         req->req.status = 0;
 708 }
 709
 710 /*-------------------------------------------------------------------------*/
 711
 712 static int
 713 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 714 {
 715         struct goku_request     *req;
 716         struct goku_ep          *ep;
 717         struct goku_udc         *dev;
 718         unsigned long           flags;
 719         int                     status;
 720
 721         /* always require a cpu-view buffer so pio works */
 722         req = container_of(_req, struct goku_request, req);
 723         if (unlikely(!_req || !_req->complete
 724                         || !_req->buf || !list_empty(&req->queue)))
 725                 return -EINVAL;
 726         ep = container_of(_ep, struct goku_ep, ep);
 727         if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
 728                 return -EINVAL;
 729         dev = ep->dev;
 730         if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
 731                 return -ESHUTDOWN;
 732
 733         /* can't touch registers when suspended */
 734         if (dev->ep0state == EP0_SUSPEND)
 735                 return -EBUSY;
 736
 737         /* set up dma mapping in case the caller didn't */
 738         if (ep->dma && _req->dma == DMA_ADDR_INVALID) {
 739                 _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
 740                         ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 741                 req->mapped = 1;
 742         }
 743
 744 #ifdef USB_TRACE
 745         VDBG(dev, "%s queue req %p, len %u buf %p\n",
 746                         _ep->name, _req, _req->length, _req->buf);
 747 #endif
 748
 749         spin_lock_irqsave(&dev->lock, flags);
 750
 751         _req->status = -EINPROGRESS;
 752         _req->actual = 0;
 753
 754         /* for ep0 IN without premature status, zlp is required and
 755          * writing EOP starts the status stage (OUT).
 756          */
 757         if (unlikely(ep->num == 0 && ep->is_in))
 758                 _req->zero = 1;
 759
 760         /* kickstart this i/o queue? */
 761         status = 0;
 762         if (list_empty(&ep->queue) && likely(!ep->stopped)) {
 763                 /* dma:  done after dma completion IRQ (or error)
 764                  * pio:  done after last fifo operation
 765                  */
 766                 if (ep->dma)
 767                         status = start_dma(ep, req);
 768                 else
 769                         status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
 770
 771                 if (unlikely(status != 0)) {
 772                         if (status > 0)
 773                                 status = 0;
 774                         req = NULL;
 775                 }
 776
 777         } /* else pio or dma irq handler advances the queue. */
 778
 779         if (likely(req != 0))
 780                 list_add_tail(&req->queue, &ep->queue);
 781
 782         if (likely(!list_empty(&ep->queue))
 783                         && likely(ep->num != 0)
 784                         && !ep->dma
 785                         && !(dev->int_enable & INT_EPxDATASET (ep->num)))
 786                 pio_irq_enable(dev, dev->regs, ep->num);
 787
 788         spin_unlock_irqrestore(&dev->lock, flags);
 789
 790         /* pci writes may still be posted */
 791         return status;
 792 }
 793
 794 /* dequeue ALL requests */
 795 static void nuke(struct goku_ep *ep, int status)
 796 {
 797         struct goku_request     *req;
 798
 799         ep->stopped = 1;
 800         if (list_empty(&ep->queue))
 801                 return;
 802         if (ep->dma)
 803                 abort_dma(ep, status);
 804         while (!list_empty(&ep->queue)) {
 805                 req = list_entry(ep->queue.next, struct goku_request, queue);
 806                 done(ep, req, status);
 807         }
 808 }
 809
 810 /* dequeue JUST ONE request */
 811 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 812 {
 813         struct goku_request     *req;
 814         struct goku_ep          *ep;
 815         struct goku_udc         *dev;
 816         unsigned long           flags;
 817
 818         ep = container_of(_ep, struct goku_ep, ep);
 819         if (!_ep || !_req || (!ep->desc && ep->num != 0))
 820                 return -EINVAL;
 821         dev = ep->dev;
 822         if (!dev->driver)
 823                 return -ESHUTDOWN;
 824
 825         /* we can't touch (dma) registers when suspended */
 826         if (dev->ep0state == EP0_SUSPEND)
 827                 return -EBUSY;
 828
 829         VDBG(dev, "%s %s %s %s %p\n", __func__, _ep->name,
 830                 ep->is_in ? "IN" : "OUT",
 831                 ep->dma ? "dma" : "pio",
 832                 _req);
 833
 834         spin_lock_irqsave(&dev->lock, flags);
 835
 836         /* make sure it's actually queued on this endpoint */
 837         list_for_each_entry (req, &ep->queue, queue) {
 838                 if (&req->req == _req)
 839                         break;
 840         }
 841         if (&req->req != _req) {
 842                 spin_unlock_irqrestore (&dev->lock, flags);
 843                 return -EINVAL;
 844         }
 845
 846         if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
 847                 abort_dma(ep, -ECONNRESET);
 848                 done(ep, req, -ECONNRESET);
 849                 dma_advance(dev, ep);
 850         } else if (!list_empty(&req->queue))
 851                 done(ep, req, -ECONNRESET);
 852         else
 853                 req = NULL;
 854         spin_unlock_irqrestore(&dev->lock, flags);
 855
 856         return req ? 0 : -EOPNOTSUPP;
 857 }
 858
 859 /*-------------------------------------------------------------------------*/
 860
 861 static void goku_clear_halt(struct goku_ep *ep)
 862 {
 863         // assert (ep->num !=0)
 864         VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
 865         command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
 866         command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
 867         if (ep->stopped) {
 868                 ep->stopped = 0;
 869                 if (ep->dma) {
 870                         struct goku_request     *req;
 871
 872                         if (list_empty(&ep->queue))
 873                                 return;
 874                         req = list_entry(ep->queue.next, struct goku_request,
 875                                                 queue);
 876                         (void) start_dma(ep, req);
 877                 } else
 878                         pio_advance(ep);
 879         }
 880 }
 881
 882 static int goku_set_halt(struct usb_ep *_ep, int value)
 883 {
 884         struct goku_ep  *ep;
 885         unsigned long   flags;
 886         int             retval = 0;
 887
 888         if (!_ep)
 889                 return -ENODEV;
 890         ep = container_of (_ep, struct goku_ep, ep);
 891
 892         if (ep->num == 0) {
 893                 if (value) {
 894                         ep->dev->ep0state = EP0_STALL;
 895                         ep->dev->ep[0].stopped = 1;
 896                 } else
 897                         return -EINVAL;
 898
 899         /* don't change EPxSTATUS_EP_INVALID to READY */
 900         } else if (!ep->desc) {
 901                 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
 902                 return -EINVAL;
 903         }
 904
 905         spin_lock_irqsave(&ep->dev->lock, flags);
 906         if (!list_empty(&ep->queue))
 907                 retval = -EAGAIN;
 908         else if (ep->is_in && value
 909                         /* data in (either) packet buffer? */
 910                         && (readl(&ep->dev->regs->DataSet)
 911                                         & DATASET_AB(ep->num)))
 912                 retval = -EAGAIN;
 913         else if (!value)
 914                 goku_clear_halt(ep);
 915         else {
 916                 ep->stopped = 1;
 917                 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
 918                 command(ep->dev->regs, COMMAND_STALL, ep->num);
 919                 readl(ep->reg_status);
 920         }
 921         spin_unlock_irqrestore(&ep->dev->lock, flags);
 922         return retval;
 923 }
 924
 925 static int goku_fifo_status(struct usb_ep *_ep)
 926 {
 927         struct goku_ep                  *ep;
 928         struct goku_udc_regs __iomem    *regs;
 929         u32                             size;
 930
 931         if (!_ep)
 932                 return -ENODEV;
 933         ep = container_of(_ep, struct goku_ep, ep);
 934
 935         /* size is only reported sanely for OUT */
 936         if (ep->is_in)
 937                 return -EOPNOTSUPP;
 938
 939         /* ignores 16-byte dma buffer; SizeH == 0 */
 940         regs = ep->dev->regs;
 941         size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
 942         size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
 943         VDBG(ep->dev, "%s %s %u\n", __func__, ep->ep.name, size);
 944         return size;
 945 }
 946
 947 static void goku_fifo_flush(struct usb_ep *_ep)
 948 {
 949         struct goku_ep                  *ep;
 950         struct goku_udc_regs __iomem    *regs;
 951         u32                             size;
 952
 953         if (!_ep)
 954                 return;
 955         ep = container_of(_ep, struct goku_ep, ep);
 956         VDBG(ep->dev, "%s %s\n", __func__, ep->ep.name);
 957
 958         /* don't change EPxSTATUS_EP_INVALID to READY */
 959         if (!ep->desc && ep->num != 0) {
 960                 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
 961                 return;
 962         }
 963
 964         regs = ep->dev->regs;
 965         size = readl(&regs->EPxSizeLA[ep->num]);
 966         size &= DATASIZE;
 967
 968         /* Non-desirable behavior:  FIFO_CLEAR also clears the
 969          * endpoint halt feature.  For OUT, we _could_ just read
 970          * the bytes out (PIO, if !ep->dma); for in, no choice.
 971          */
 972         if (size)
 973                 command(regs, COMMAND_FIFO_CLEAR, ep->num);
 974 }
 975
 976 static struct usb_ep_ops goku_ep_ops = {
 977         .enable         = goku_ep_enable,
 978         .disable        = goku_ep_disable,
 979
 980         .alloc_request  = goku_alloc_request,
 981         .free_request   = goku_free_request,
 982
 983         .queue          = goku_queue,
 984         .dequeue        = goku_dequeue,
 985
 986         .set_halt       = goku_set_halt,
 987         .fifo_status    = goku_fifo_status,
 988         .fifo_flush     = goku_fifo_flush,
 989 };
 990
 991 /*-------------------------------------------------------------------------*/
 992
 993 static int goku_get_frame(struct usb_gadget *_gadget)
 994 {
 995         return -EOPNOTSUPP;
 996 }
 997
 998 static const struct usb_gadget_ops goku_ops = {
 999         .get_frame      = goku_get_frame,
1000         // no remote wakeup
1001         // not selfpowered
1002 };
1003
1004 /*-------------------------------------------------------------------------*/
1005
1006 static inline char *dmastr(void)
1007 {
1008         if (use_dma == 0)
1009                 return "(dma disabled)";
1010         else if (use_dma == 2)
1011                 return "(dma IN and OUT)";
1012         else
1013                 return "(dma IN)";
1014 }
1015
1016 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1017
1018 static const char proc_node_name [] = "driver/udc";
1019
1020 #define FOURBITS "%s%s%s%s"
1021 #define EIGHTBITS FOURBITS FOURBITS
1022
1023 static void
1024 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1025 {
1026         int t;
1027
1028         /* int_status is the same format ... */
1029         t = scnprintf(*next, *size,
1030                 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1031                 label, mask,
1032                 (mask & INT_PWRDETECT) ? " power" : "",
1033                 (mask & INT_SYSERROR) ? " sys" : "",
1034                 (mask & INT_MSTRDEND) ? " in-dma" : "",
1035                 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1036
1037                 (mask & INT_MSTWREND) ? " out-dma" : "",
1038                 (mask & INT_MSTWRSET) ? " wrset" : "",
1039                 (mask & INT_ERR) ? " err" : "",
1040                 (mask & INT_SOF) ? " sof" : "",
1041
1042                 (mask & INT_EP3NAK) ? " ep3nak" : "",
1043                 (mask & INT_EP2NAK) ? " ep2nak" : "",
1044                 (mask & INT_EP1NAK) ? " ep1nak" : "",
1045                 (mask & INT_EP3DATASET) ? " ep3" : "",
1046
1047                 (mask & INT_EP2DATASET) ? " ep2" : "",
1048                 (mask & INT_EP1DATASET) ? " ep1" : "",
1049                 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1050                 (mask & INT_STATUS) ? " ep0status" : "",
1051
1052                 (mask & INT_SETUP) ? " setup" : "",
1053                 (mask & INT_ENDPOINT0) ? " ep0" : "",
1054                 (mask & INT_USBRESET) ? " reset" : "",
1055                 (mask & INT_SUSPEND) ? " suspend" : "");
1056         *size -= t;
1057         *next += t;
1058 }
1059
1060
1061 static int
1062 udc_proc_read(char *buffer, char **start, off_t off, int count,
1063                 int *eof, void *_dev)
1064 {
1065         char                            *buf = buffer;
1066         struct goku_udc                 *dev = _dev;
1067         struct goku_udc_regs __iomem    *regs = dev->regs;
1068         char                            *next = buf;
1069         unsigned                        size = count;
1070         unsigned long                   flags;
1071         int                             i, t, is_usb_connected;
1072         u32                             tmp;
1073
1074         if (off != 0)
1075                 return 0;
1076
1077         local_irq_save(flags);
1078
1079         /* basic device status */
1080         tmp = readl(&regs->power_detect);
1081         is_usb_connected = tmp & PW_DETECT;
1082         t = scnprintf(next, size,
1083                 "%s - %s\n"
1084                 "%s version: %s %s\n"
1085                 "Gadget driver: %s\n"
1086                 "Host %s, %s\n"
1087                 "\n",
1088                 pci_name(dev->pdev), driver_desc,
1089                 driver_name, DRIVER_VERSION, dmastr(),
1090                 dev->driver ? dev->driver->driver.name : "(none)",
1091                 is_usb_connected
1092                         ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1093                         : "disconnected",
1094                 ({char *state;
1095                 switch(dev->ep0state){
1096                 case EP0_DISCONNECT:    state = "ep0_disconnect"; break;
1097                 case EP0_IDLE:          state = "ep0_idle"; break;
1098                 case EP0_IN:            state = "ep0_in"; break;
1099                 case EP0_OUT:           state = "ep0_out"; break;
1100                 case EP0_STATUS:        state = "ep0_status"; break;
1101                 case EP0_STALL:         state = "ep0_stall"; break;
1102                 case EP0_SUSPEND:       state = "ep0_suspend"; break;
1103                 default:                state = "ep0_?"; break;
1104                 } state; })
1105                 );
1106         size -= t;
1107         next += t;
1108
1109         dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1110         dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1111
1112         if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1113                 goto done;
1114
1115         /* registers for (active) device and ep0 */
1116         t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1117                         "single.bcs %02x.%02x state %x addr %u\n",
1118                         dev->irqs, readl(&regs->DataSet),
1119                         readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1120                         readl(&regs->UsbState),
1121                         readl(&regs->address));
1122         size -= t;
1123         next += t;
1124
1125         tmp = readl(&regs->dma_master);
1126         t = scnprintf(next, size,
1127                 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1128                 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1129                 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1130                 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1131                 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1132
1133                 (tmp & MST_RD_EOPB) ? " eopb" : "",
1134                 (tmp & MST_RD_RESET) ? " in_reset" : "",
1135                 (tmp & MST_WR_RESET) ? " out_reset" : "",
1136                 (tmp & MST_RD_ENA) ? " IN" : "",
1137
1138                 (tmp & MST_WR_ENA) ? " OUT" : "",
1139                 (tmp & MST_CONNECTION)
1140                         ? "ep1in/ep2out"
1141                         : "ep1out/ep2in");
1142         size -= t;
1143         next += t;
1144
1145         /* dump endpoint queues */
1146         for (i = 0; i < 4; i++) {
1147                 struct goku_ep          *ep = &dev->ep [i];
1148                 struct goku_request     *req;
1149
1150                 if (i && !ep->desc)
1151                         continue;
1152
1153                 tmp = readl(ep->reg_status);
1154                 t = scnprintf(next, size,
1155                         "%s %s max %u %s, irqs %lu, "
1156                         "status %02x (%s) " FOURBITS "\n",
1157                         ep->ep.name,
1158                         ep->is_in ? "in" : "out",
1159                         ep->ep.maxpacket,
1160                         ep->dma ? "dma" : "pio",
1161                         ep->irqs,
1162                         tmp, ({ char *s;
1163                         switch (tmp & EPxSTATUS_EP_MASK) {
1164                         case EPxSTATUS_EP_READY:
1165                                 s = "ready"; break;
1166                         case EPxSTATUS_EP_DATAIN:
1167                                 s = "packet"; break;
1168                         case EPxSTATUS_EP_FULL:
1169                                 s = "full"; break;
1170                         case EPxSTATUS_EP_TX_ERR:       // host will retry
1171                                 s = "tx_err"; break;
1172                         case EPxSTATUS_EP_RX_ERR:
1173                                 s = "rx_err"; break;
1174                         case EPxSTATUS_EP_BUSY:         /* ep0 only */
1175                                 s = "busy"; break;
1176                         case EPxSTATUS_EP_STALL:
1177                                 s = "stall"; break;
1178                         case EPxSTATUS_EP_INVALID:      // these "can't happen"
1179                                 s = "invalid"; break;
1180                         default:
1181                                 s = "?"; break;
1182                         }; s; }),
1183                         (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1184                         (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1185                         (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1186                         (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1187                         );
1188                 if (t <= 0 || t > size)
1189                         goto done;
1190                 size -= t;
1191                 next += t;
1192
1193                 if (list_empty(&ep->queue)) {
1194                         t = scnprintf(next, size, "\t(nothing queued)\n");
1195                         if (t <= 0 || t > size)
1196                                 goto done;
1197                         size -= t;
1198                         next += t;
1199                         continue;
1200                 }
1201                 list_for_each_entry(req, &ep->queue, queue) {
1202                         if (ep->dma && req->queue.prev == &ep->queue) {
1203                                 if (i == UDC_MSTRD_ENDPOINT)
1204                                         tmp = readl(&regs->in_dma_current);
1205                                 else
1206                                         tmp = readl(&regs->out_dma_current);
1207                                 tmp -= req->req.dma;
1208                                 tmp++;
1209                         } else
1210                                 tmp = req->req.actual;
1211
1212                         t = scnprintf(next, size,
1213                                 "\treq %p len %u/%u buf %p\n",
1214                                 &req->req, tmp, req->req.length,
1215                                 req->req.buf);
1216                         if (t <= 0 || t > size)
1217                                 goto done;
1218                         size -= t;
1219                         next += t;
1220                 }
1221         }
1222
1223 done:
1224         local_irq_restore(flags);
1225         *eof = 1;
1226         return count - size;
1227 }
1228
1229 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1230
1231 /*-------------------------------------------------------------------------*/
1232
1233 static void udc_reinit (struct goku_udc *dev)
1234 {
1235         static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1236
1237         unsigned i;
1238
1239         INIT_LIST_HEAD (&dev->gadget.ep_list);
1240         dev->gadget.ep0 = &dev->ep [0].ep;
1241         dev->gadget.speed = USB_SPEED_UNKNOWN;
1242         dev->ep0state = EP0_DISCONNECT;
1243         dev->irqs = 0;
1244
1245         for (i = 0; i < 4; i++) {
1246                 struct goku_ep  *ep = &dev->ep[i];
1247
1248                 ep->num = i;
1249                 ep->ep.name = names[i];
1250                 ep->reg_fifo = &dev->regs->ep_fifo [i];
1251                 ep->reg_status = &dev->regs->ep_status [i];
1252                 ep->reg_mode = &dev->regs->ep_mode[i];
1253
1254                 ep->ep.ops = &goku_ep_ops;
1255                 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1256                 ep->dev = dev;
1257                 INIT_LIST_HEAD (&ep->queue);
1258
1259                 ep_reset(NULL, ep);
1260         }
1261
1262         dev->ep[0].reg_mode = NULL;
1263         dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1264         list_del_init (&dev->ep[0].ep.ep_list);
1265 }
1266
1267 static void udc_reset(struct goku_udc *dev)
1268 {
1269         struct goku_udc_regs __iomem    *regs = dev->regs;
1270
1271         writel(0, &regs->power_detect);
1272         writel(0, &regs->int_enable);
1273         readl(&regs->int_enable);
1274         dev->int_enable = 0;
1275
1276         /* deassert reset, leave USB D+ at hi-Z (no pullup)
1277          * don't let INT_PWRDETECT sequence begin
1278          */
1279         udelay(250);
1280         writel(PW_RESETB, &regs->power_detect);
1281         readl(&regs->int_enable);
1282 }
1283
1284 static void ep0_start(struct goku_udc *dev)
1285 {
1286         struct goku_udc_regs __iomem    *regs = dev->regs;
1287         unsigned                        i;
1288
1289         VDBG(dev, "%s\n", __func__);
1290
1291         udc_reset(dev);
1292         udc_reinit (dev);
1293         //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1294
1295         /* hw handles set_address, set_feature, get_status; maybe more */
1296         writel(   G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1297                 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1298                 | G_REQMODE_GET_DESC
1299                 | G_REQMODE_CLEAR_FEAT
1300                 , &regs->reqmode);
1301
1302         for (i = 0; i < 4; i++)
1303                 dev->ep[i].irqs = 0;
1304
1305         /* can't modify descriptors after writing UsbReady */
1306         for (i = 0; i < DESC_LEN; i++)
1307                 writel(0, &regs->descriptors[i]);
1308         writel(0, &regs->UsbReady);
1309
1310         /* expect ep0 requests when the host drops reset */
1311         writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1312         dev->int_enable = INT_DEVWIDE | INT_EP0;
1313         writel(dev->int_enable, &dev->regs->int_enable);
1314         readl(&regs->int_enable);
1315         dev->gadget.speed = USB_SPEED_FULL;
1316         dev->ep0state = EP0_IDLE;
1317 }
1318
1319 static void udc_enable(struct goku_udc *dev)
1320 {
1321         /* start enumeration now, or after power detect irq */
1322         if (readl(&dev->regs->power_detect) & PW_DETECT)
1323                 ep0_start(dev);
1324         else {
1325                 DBG(dev, "%s\n", __func__);
1326                 dev->int_enable = INT_PWRDETECT;
1327                 writel(dev->int_enable, &dev->regs->int_enable);
1328         }
1329 }
1330
1331 /*-------------------------------------------------------------------------*/
1332
1333 /* keeping it simple:
1334  * - one bus driver, initted first;
1335  * - one function driver, initted second
1336  */
1337
1338 static struct goku_udc  *the_controller;
1339
1340 /* when a driver is successfully registered, it will receive
1341  * control requests including set_configuration(), which enables
1342  * non-control requests.  then usb traffic follows until a
1343  * disconnect is reported.  then a host may connect again, or
1344  * the driver might get unbound.
1345  */
1346 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1347 {
1348         struct goku_udc *dev = the_controller;
1349         int                     retval;
1350
1351         if (!driver
1352                         || driver->speed != USB_SPEED_FULL
1353                         || !driver->bind
1354                         || !driver->disconnect
1355                         || !driver->setup)
1356                 return -EINVAL;
1357         if (!dev)
1358                 return -ENODEV;
1359         if (dev->driver)
1360                 return -EBUSY;
1361
1362         /* hook up the driver */
1363         driver->driver.bus = NULL;
1364         dev->driver = driver;
1365         dev->gadget.dev.driver = &driver->driver;
1366         retval = driver->bind(&dev->gadget);
1367         if (retval) {
1368                 DBG(dev, "bind to driver %s --> error %d\n",
1369                                 driver->driver.name, retval);
1370                 dev->driver = NULL;
1371                 dev->gadget.dev.driver = NULL;
1372                 return retval;
1373         }
1374
1375         /* then enable host detection and ep0; and we're ready
1376          * for set_configuration as well as eventual disconnect.
1377          */
1378         udc_enable(dev);
1379
1380         DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1381         return 0;
1382 }
1383 EXPORT_SYMBOL(usb_gadget_register_driver);
1384
1385 static void
1386 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1387 {
1388         unsigned        i;
1389
1390         DBG (dev, "%s\n", __func__);
1391
1392         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1393                 driver = NULL;
1394
1395         /* disconnect gadget driver after quiesceing hw and the driver */
1396         udc_reset (dev);
1397         for (i = 0; i < 4; i++)
1398                 nuke(&dev->ep [i], -ESHUTDOWN);
1399         if (driver) {
1400                 spin_unlock(&dev->lock);
1401                 driver->disconnect(&dev->gadget);
1402                 spin_lock(&dev->lock);
1403         }
1404
1405         if (dev->driver)
1406                 udc_enable(dev);
1407 }
1408
1409 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1410 {
1411         struct goku_udc *dev = the_controller;
1412         unsigned long   flags;
1413
1414         if (!dev)
1415                 return -ENODEV;
1416         if (!driver || driver != dev->driver || !driver->unbind)
1417                 return -EINVAL;
1418
1419         spin_lock_irqsave(&dev->lock, flags);
1420         dev->driver = NULL;
1421         stop_activity(dev, driver);
1422         spin_unlock_irqrestore(&dev->lock, flags);
1423
1424         driver->unbind(&dev->gadget);
1425         dev->gadget.dev.driver = NULL;
1426
1427         DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1428         return 0;
1429 }
1430 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1431
1432
1433 /*-------------------------------------------------------------------------*/
1434
1435 static void ep0_setup(struct goku_udc *dev)
1436 {
1437         struct goku_udc_regs __iomem    *regs = dev->regs;
1438         struct usb_ctrlrequest          ctrl;
1439         int                             tmp;
1440
1441         /* read SETUP packet and enter DATA stage */
1442         ctrl.bRequestType = readl(&regs->bRequestType);
1443         ctrl.bRequest = readl(&regs->bRequest);
1444         ctrl.wValue  = cpu_to_le16((readl(&regs->wValueH)  << 8)
1445                                         | readl(&regs->wValueL));
1446         ctrl.wIndex  = cpu_to_le16((readl(&regs->wIndexH)  << 8)
1447                                         | readl(&regs->wIndexL));
1448         ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1449                                         | readl(&regs->wLengthL));
1450         writel(0, &regs->SetupRecv);
1451
1452         nuke(&dev->ep[0], 0);
1453         dev->ep[0].stopped = 0;
1454         if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1455                 dev->ep[0].is_in = 1;
1456                 dev->ep0state = EP0_IN;
1457                 /* detect early status stages */
1458                 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1459         } else {
1460                 dev->ep[0].is_in = 0;
1461                 dev->ep0state = EP0_OUT;
1462
1463                 /* NOTE:  CLEAR_FEATURE is done in software so that we can
1464                  * synchronize transfer restarts after bulk IN stalls.  data
1465                  * won't even enter the fifo until the halt is cleared.
1466                  */
1467                 switch (ctrl.bRequest) {
1468                 case USB_REQ_CLEAR_FEATURE:
1469                         switch (ctrl.bRequestType) {
1470                         case USB_RECIP_ENDPOINT:
1471                                 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1472                                 /* active endpoint */
1473                                 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1474                                         goto stall;
1475                                 if (ctrl.wIndex & __constant_cpu_to_le16(
1476                                                 USB_DIR_IN)) {
1477                                         if (!dev->ep[tmp].is_in)
1478                                                 goto stall;
1479                                 } else {
1480                                         if (dev->ep[tmp].is_in)
1481                                                 goto stall;
1482                                 }
1483                                 if (ctrl.wValue != __constant_cpu_to_le16(
1484                                                 USB_ENDPOINT_HALT))
1485                                         goto stall;
1486                                 if (tmp)
1487                                         goku_clear_halt(&dev->ep[tmp]);
1488 succeed:
1489                                 /* start ep0out status stage */
1490                                 writel(~(1<<0), &regs->EOP);
1491                                 dev->ep[0].stopped = 1;
1492                                 dev->ep0state = EP0_STATUS;
1493                                 return;
1494                         case USB_RECIP_DEVICE:
1495                                 /* device remote wakeup: always clear */
1496                                 if (ctrl.wValue != __constant_cpu_to_le16(1))
1497                                         goto stall;
1498                                 VDBG(dev, "clear dev remote wakeup\n");
1499                                 goto succeed;
1500                         case USB_RECIP_INTERFACE:
1501                                 goto stall;
1502                         default:                /* pass to gadget driver */
1503                                 break;
1504                         }
1505                         break;
1506                 default:
1507                         break;
1508                 }
1509         }
1510
1511 #ifdef USB_TRACE
1512         VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1513                 ctrl.bRequestType, ctrl.bRequest,
1514                 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1515                 le16_to_cpu(ctrl.wLength));
1516 #endif
1517
1518         /* hw wants to know when we're configured (or not) */
1519         dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1520                                 && ctrl.bRequestType == USB_RECIP_DEVICE);
1521         if (unlikely(dev->req_config))
1522                 dev->configured = (ctrl.wValue != __constant_cpu_to_le16(0));
1523
1524         /* delegate everything to the gadget driver.
1525          * it may respond after this irq handler returns.
1526          */
1527         spin_unlock (&dev->lock);
1528         tmp = dev->driver->setup(&dev->gadget, &ctrl);
1529         spin_lock (&dev->lock);
1530         if (unlikely(tmp < 0)) {
1531 stall:
1532 #ifdef USB_TRACE
1533                 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1534                                 ctrl.bRequestType, ctrl.bRequest, tmp);
1535 #endif
1536                 command(regs, COMMAND_STALL, 0);
1537                 dev->ep[0].stopped = 1;
1538                 dev->ep0state = EP0_STALL;
1539         }
1540
1541         /* expect at least one data or status stage irq */
1542 }
1543
1544 #define ACK(irqbit) { \
1545                 stat &= ~irqbit; \
1546                 writel(~irqbit, &regs->int_status); \
1547                 handled = 1; \
1548                 }
1549
1550 static irqreturn_t goku_irq(int irq, void *_dev)
1551 {
1552         struct goku_udc                 *dev = _dev;
1553         struct goku_udc_regs __iomem    *regs = dev->regs;
1554         struct goku_ep                  *ep;
1555         u32                             stat, handled = 0;
1556         unsigned                        i, rescans = 5;
1557
1558         spin_lock(&dev->lock);
1559
1560 rescan:
1561         stat = readl(&regs->int_status) & dev->int_enable;
1562         if (!stat)
1563                 goto done;
1564         dev->irqs++;
1565
1566         /* device-wide irqs */
1567         if (unlikely(stat & INT_DEVWIDE)) {
1568                 if (stat & INT_SYSERROR) {
1569                         ERROR(dev, "system error\n");
1570                         stop_activity(dev, dev->driver);
1571                         stat = 0;
1572                         handled = 1;
1573                         // FIXME have a neater way to prevent re-enumeration
1574                         dev->driver = NULL;
1575                         goto done;
1576                 }
1577                 if (stat & INT_PWRDETECT) {
1578                         writel(~stat, &regs->int_status);
1579                         if (readl(&dev->regs->power_detect) & PW_DETECT) {
1580                                 VDBG(dev, "connect\n");
1581                                 ep0_start(dev);
1582                         } else {
1583                                 DBG(dev, "disconnect\n");
1584                                 if (dev->gadget.speed == USB_SPEED_FULL)
1585                                         stop_activity(dev, dev->driver);
1586                                 dev->ep0state = EP0_DISCONNECT;
1587                                 dev->int_enable = INT_DEVWIDE;
1588                                 writel(dev->int_enable, &dev->regs->int_enable);
1589                         }
1590                         stat = 0;
1591                         handled = 1;
1592                         goto done;
1593                 }
1594                 if (stat & INT_SUSPEND) {
1595                         ACK(INT_SUSPEND);
1596                         if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1597                                 switch (dev->ep0state) {
1598                                 case EP0_DISCONNECT:
1599                                 case EP0_SUSPEND:
1600                                         goto pm_next;
1601                                 default:
1602                                         break;
1603                                 }
1604                                 DBG(dev, "USB suspend\n");
1605                                 dev->ep0state = EP0_SUSPEND;
1606                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1607                                                 && dev->driver
1608                                                 && dev->driver->suspend) {
1609                                         spin_unlock(&dev->lock);
1610                                         dev->driver->suspend(&dev->gadget);
1611                                         spin_lock(&dev->lock);
1612                                 }
1613                         } else {
1614                                 if (dev->ep0state != EP0_SUSPEND) {
1615                                         DBG(dev, "bogus USB resume %d\n",
1616                                                 dev->ep0state);
1617                                         goto pm_next;
1618                                 }
1619                                 DBG(dev, "USB resume\n");
1620                                 dev->ep0state = EP0_IDLE;
1621                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1622                                                 && dev->driver
1623                                                 && dev->driver->resume) {
1624                                         spin_unlock(&dev->lock);
1625                                         dev->driver->resume(&dev->gadget);
1626                                         spin_lock(&dev->lock);
1627                                 }
1628                         }
1629                 }
1630 pm_next:
1631                 if (stat & INT_USBRESET) {              /* hub reset done */
1632                         ACK(INT_USBRESET);
1633                         INFO(dev, "USB reset done, gadget %s\n",
1634                                 dev->driver->driver.name);
1635                 }
1636                 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1637         }
1638
1639         /* progress ep0 setup, data, or status stages.
1640          * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1641          */
1642         if (stat & INT_SETUP) {
1643                 ACK(INT_SETUP);
1644                 dev->ep[0].irqs++;
1645                 ep0_setup(dev);
1646         }
1647         if (stat & INT_STATUSNAK) {
1648                 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1649                 if (dev->ep0state == EP0_IN) {
1650                         ep = &dev->ep[0];
1651                         ep->irqs++;
1652                         nuke(ep, 0);
1653                         writel(~(1<<0), &regs->EOP);
1654                         dev->ep0state = EP0_STATUS;
1655                 }
1656         }
1657         if (stat & INT_ENDPOINT0) {
1658                 ACK(INT_ENDPOINT0);
1659                 ep = &dev->ep[0];
1660                 ep->irqs++;
1661                 pio_advance(ep);
1662         }
1663
1664         /* dma completion */
1665         if (stat & INT_MSTRDEND) {      /* IN */
1666                 ACK(INT_MSTRDEND);
1667                 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1668                 ep->irqs++;
1669                 dma_advance(dev, ep);
1670         }
1671         if (stat & INT_MSTWREND) {      /* OUT */
1672                 ACK(INT_MSTWREND);
1673                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1674                 ep->irqs++;
1675                 dma_advance(dev, ep);
1676         }
1677         if (stat & INT_MSTWRTMOUT) {    /* OUT */
1678                 ACK(INT_MSTWRTMOUT);
1679                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1680                 ep->irqs++;
1681                 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1682                 // reset dma? then dma_advance()
1683         }
1684
1685         /* pio */
1686         for (i = 1; i < 4; i++) {
1687                 u32             tmp = INT_EPxDATASET(i);
1688
1689                 if (!(stat & tmp))
1690                         continue;
1691                 ep = &dev->ep[i];
1692                 pio_advance(ep);
1693                 if (list_empty (&ep->queue))
1694                         pio_irq_disable(dev, regs, i);
1695                 stat &= ~tmp;
1696                 handled = 1;
1697                 ep->irqs++;
1698         }
1699
1700         if (rescans--)
1701                 goto rescan;
1702
1703 done:
1704         (void)readl(&regs->int_enable);
1705         spin_unlock(&dev->lock);
1706         if (stat)
1707                 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1708                                 readl(&regs->int_status), dev->int_enable);
1709         return IRQ_RETVAL(handled);
1710 }
1711
1712 #undef ACK
1713
1714 /*-------------------------------------------------------------------------*/
1715
1716 static void gadget_release(struct device *_dev)
1717 {
1718         struct goku_udc *dev = dev_get_drvdata(_dev);
1719
1720         kfree(dev);
1721 }
1722
1723 /* tear down the binding between this driver and the pci device */
1724
1725 static void goku_remove(struct pci_dev *pdev)
1726 {
1727         struct goku_udc         *dev = pci_get_drvdata(pdev);
1728
1729         DBG(dev, "%s\n", __func__);
1730
1731         BUG_ON(dev->driver);
1732
1733 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1734         remove_proc_entry(proc_node_name, NULL);
1735 #endif
1736         if (dev->regs)
1737                 udc_reset(dev);
1738         if (dev->got_irq)
1739                 free_irq(pdev->irq, dev);
1740         if (dev->regs)
1741                 iounmap(dev->regs);
1742         if (dev->got_region)
1743                 release_mem_region(pci_resource_start (pdev, 0),
1744                                 pci_resource_len (pdev, 0));
1745         if (dev->enabled)
1746                 pci_disable_device(pdev);
1747         device_unregister(&dev->gadget.dev);
1748
1749         pci_set_drvdata(pdev, NULL);
1750         dev->regs = NULL;
1751         the_controller = NULL;
1752
1753         INFO(dev, "unbind\n");
1754 }
1755
1756 /* wrap this driver around the specified pci device, but
1757  * don't respond over USB until a gadget driver binds to us.
1758  */
1759
1760 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1761 {
1762         struct goku_udc         *dev = NULL;
1763         unsigned long           resource, len;
1764         void __iomem            *base = NULL;
1765         int                     retval;
1766
1767         /* if you want to support more than one controller in a system,
1768          * usb_gadget_driver_{register,unregister}() must change.
1769          */
1770         if (the_controller) {
1771                 WARN(dev, "ignoring %s\n", pci_name(pdev));
1772                 return -EBUSY;
1773         }
1774         if (!pdev->irq) {
1775                 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1776                 retval = -ENODEV;
1777                 goto done;
1778         }
1779
1780         /* alloc, and start init */
1781         dev = kzalloc (sizeof *dev, GFP_KERNEL);
1782         if (dev == NULL){
1783                 pr_debug("enomem %s\n", pci_name(pdev));
1784                 retval = -ENOMEM;
1785                 goto done;
1786         }
1787
1788         spin_lock_init(&dev->lock);
1789         dev->pdev = pdev;
1790         dev->gadget.ops = &goku_ops;
1791
1792         /* the "gadget" abstracts/virtualizes the controller */
1793         strcpy(dev->gadget.dev.bus_id, "gadget");
1794         dev->gadget.dev.parent = &pdev->dev;
1795         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1796         dev->gadget.dev.release = gadget_release;
1797         dev->gadget.name = driver_name;
1798
1799         /* now all the pci goodies ... */
1800         retval = pci_enable_device(pdev);
1801         if (retval < 0) {
1802                 DBG(dev, "can't enable, %d\n", retval);
1803                 goto done;
1804         }
1805         dev->enabled = 1;
1806
1807         resource = pci_resource_start(pdev, 0);
1808         len = pci_resource_len(pdev, 0);
1809         if (!request_mem_region(resource, len, driver_name)) {
1810                 DBG(dev, "controller already in use\n");
1811                 retval = -EBUSY;
1812                 goto done;
1813         }
1814         dev->got_region = 1;
1815
1816         base = ioremap_nocache(resource, len);
1817         if (base == NULL) {
1818                 DBG(dev, "can't map memory\n");
1819                 retval = -EFAULT;
1820                 goto done;
1821         }
1822         dev->regs = (struct goku_udc_regs __iomem *) base;
1823
1824         pci_set_drvdata(pdev, dev);
1825         INFO(dev, "%s\n", driver_desc);
1826         INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1827         INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1828
1829         /* init to known state, then setup irqs */
1830         udc_reset(dev);
1831         udc_reinit (dev);
1832         if (request_irq(pdev->irq, goku_irq, IRQF_SHARED/*|IRQF_SAMPLE_RANDOM*/,
1833                         driver_name, dev) != 0) {
1834                 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1835                 retval = -EBUSY;
1836                 goto done;
1837         }
1838         dev->got_irq = 1;
1839         if (use_dma)
1840                 pci_set_master(pdev);
1841
1842
1843 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1844         create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1845 #endif
1846
1847         /* done */
1848         the_controller = dev;
1849         retval = device_register(&dev->gadget.dev);
1850         if (retval == 0)
1851                 return 0;
1852
1853 done:
1854         if (dev)
1855                 goku_remove (pdev);
1856         return retval;
1857 }
1858
1859
1860 /*-------------------------------------------------------------------------*/
1861
1862 static struct pci_device_id pci_ids [] = { {
1863         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1864         .class_mask =   ~0,
1865         .vendor =       0x102f,         /* Toshiba */
1866         .device =       0x0107,         /* this UDC */
1867         .subvendor =    PCI_ANY_ID,
1868         .subdevice =    PCI_ANY_ID,
1869
1870 }, { /* end: all zeroes */ }
1871 };
1872 MODULE_DEVICE_TABLE (pci, pci_ids);
1873
1874 static struct pci_driver goku_pci_driver = {
1875         .name =         (char *) driver_name,
1876         .id_table =     pci_ids,
1877
1878         .probe =        goku_probe,
1879         .remove =       goku_remove,
1880
1881         /* FIXME add power management support */
1882 };
1883
1884 static int __init init (void)
1885 {
1886         return pci_register_driver (&goku_pci_driver);
1887 }
1888 module_init (init);
1889
1890 static void __exit cleanup (void)
1891 {
1892         pci_unregister_driver (&goku_pci_driver);
1893 }
1894 module_exit (cleanup);