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