Pileus Git - ~andy/linux/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 #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 #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 != usb_endpoint_num(desc))
 114                 return -EINVAL;
 115
 116         switch (usb_endpoint_type(desc)) {
 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_endpoint_dir_in(desc);
 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->ep.desc = NULL;
 238         ep->stopped = 1;
 239         ep->irqs = 0;
 240         ep->dma = 0;
 241 }
 242
 243 static int goku_ep_disable(struct usb_ep *_ep)
 244 {
 245         struct goku_ep  *ep;
 246         struct goku_udc *dev;
 247         unsigned long   flags;
 248
 249         ep = container_of(_ep, struct goku_ep, ep);
 250         if (!_ep || !ep->desc)
 251                 return -ENODEV;
 252         dev = ep->dev;
 253         if (dev->ep0state == EP0_SUSPEND)
 254                 return -EBUSY;
 255
 256         VDBG(dev, "disable %s\n", _ep->name);
 257
 258         spin_lock_irqsave(&dev->lock, flags);
 259         nuke(ep, -ESHUTDOWN);
 260         ep_reset(dev->regs, ep);
 261         spin_unlock_irqrestore(&dev->lock, flags);
 262
 263         return 0;
 264 }
 265
 266 /*-------------------------------------------------------------------------*/
 267
 268 static struct usb_request *
 269 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 270 {
 271         struct goku_request     *req;
 272
 273         if (!_ep)
 274                 return NULL;
 275         req = kzalloc(sizeof *req, gfp_flags);
 276         if (!req)
 277                 return NULL;
 278
 279         req->req.dma = DMA_ADDR_INVALID;
 280         INIT_LIST_HEAD(&req->queue);
 281         return &req->req;
 282 }
 283
 284 static void
 285 goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
 286 {
 287         struct goku_request     *req;
 288
 289         if (!_ep || !_req)
 290                 return;
 291
 292         req = container_of(_req, struct goku_request, req);
 293         WARN_ON(!list_empty(&req->queue));
 294         kfree(req);
 295 }
 296
 297 /*-------------------------------------------------------------------------*/
 298
 299 static void
 300 done(struct goku_ep *ep, struct goku_request *req, int status)
 301 {
 302         struct goku_udc         *dev;
 303         unsigned                stopped = ep->stopped;
 304
 305         list_del_init(&req->queue);
 306
 307         if (likely(req->req.status == -EINPROGRESS))
 308                 req->req.status = status;
 309         else
 310                 status = req->req.status;
 311
 312         dev = ep->dev;
 313
 314         if (ep->dma)
 315                 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
 316
 317 #ifndef USB_TRACE
 318         if (status && status != -ESHUTDOWN)
 319 #endif
 320                 VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
 321                         ep->ep.name, &req->req, status,
 322                         req->req.actual, req->req.length);
 323
 324         /* don't modify queue heads during completion callback */
 325         ep->stopped = 1;
 326         spin_unlock(&dev->lock);
 327         req->req.complete(&ep->ep, &req->req);
 328         spin_lock(&dev->lock);
 329         ep->stopped = stopped;
 330 }
 331
 332 /*-------------------------------------------------------------------------*/
 333
 334 static inline int
 335 write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
 336 {
 337         unsigned        length, count;
 338
 339         length = min(req->req.length - req->req.actual, max);
 340         req->req.actual += length;
 341
 342         count = length;
 343         while (likely(count--))
 344                 writel(*buf++, fifo);
 345         return length;
 346 }
 347
 348 // return:  0 = still running, 1 = completed, negative = errno
 349 static int write_fifo(struct goku_ep *ep, struct goku_request *req)
 350 {
 351         struct goku_udc *dev = ep->dev;
 352         u32             tmp;
 353         u8              *buf;
 354         unsigned        count;
 355         int             is_last;
 356
 357         tmp = readl(&dev->regs->DataSet);
 358         buf = req->req.buf + req->req.actual;
 359         prefetch(buf);
 360
 361         dev = ep->dev;
 362         if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
 363                 return -EL2HLT;
 364
 365         /* NOTE:  just single-buffered PIO-IN for now.  */
 366         if (unlikely((tmp & DATASET_A(ep->num)) != 0))
 367                 return 0;
 368
 369         /* clear our "packet available" irq */
 370         if (ep->num != 0)
 371                 writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
 372
 373         count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
 374
 375         /* last packet often short (sometimes a zlp, especially on ep0) */
 376         if (unlikely(count != ep->ep.maxpacket)) {
 377                 writel(~(1<<ep->num), &dev->regs->EOP);
 378                 if (ep->num == 0) {
 379                         dev->ep[0].stopped = 1;
 380                         dev->ep0state = EP0_STATUS;
 381                 }
 382                 is_last = 1;
 383         } else {
 384                 if (likely(req->req.length != req->req.actual)
 385                                 || req->req.zero)
 386                         is_last = 0;
 387                 else
 388                         is_last = 1;
 389         }
 390 #if 0           /* printk seemed to trash is_last...*/
 391 //#ifdef USB_TRACE
 392         VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
 393                 ep->ep.name, count, is_last ? "/last" : "",
 394                 req->req.length - req->req.actual, req);
 395 #endif
 396
 397         /* requests complete when all IN data is in the FIFO,
 398          * or sometimes later, if a zlp was needed.
 399          */
 400         if (is_last) {
 401                 done(ep, req, 0);
 402                 return 1;
 403         }
 404
 405         return 0;
 406 }
 407
 408 static int read_fifo(struct goku_ep *ep, struct goku_request *req)
 409 {
 410         struct goku_udc_regs __iomem    *regs;
 411         u32                             size, set;
 412         u8                              *buf;
 413         unsigned                        bufferspace, is_short, dbuff;
 414
 415         regs = ep->dev->regs;
 416 top:
 417         buf = req->req.buf + req->req.actual;
 418         prefetchw(buf);
 419
 420         if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
 421                 return -EL2HLT;
 422
 423         dbuff = (ep->num == 1 || ep->num == 2);
 424         do {
 425                 /* ack dataset irq matching the status we'll handle */
 426                 if (ep->num != 0)
 427                         writel(~INT_EPxDATASET(ep->num), &regs->int_status);
 428
 429                 set = readl(&regs->DataSet) & DATASET_AB(ep->num);
 430                 size = readl(&regs->EPxSizeLA[ep->num]);
 431                 bufferspace = req->req.length - req->req.actual;
 432
 433                 /* usually do nothing without an OUT packet */
 434                 if (likely(ep->num != 0 || bufferspace != 0)) {
 435                         if (unlikely(set == 0))
 436                                 break;
 437                         /* use ep1/ep2 double-buffering for OUT */
 438                         if (!(size & PACKET_ACTIVE))
 439                                 size = readl(&regs->EPxSizeLB[ep->num]);
 440                         if (!(size & PACKET_ACTIVE))    /* "can't happen" */
 441                                 break;
 442                         size &= DATASIZE;       /* EPxSizeH == 0 */
 443
 444                 /* ep0out no-out-data case for set_config, etc */
 445                 } else
 446                         size = 0;
 447
 448                 /* read all bytes from this packet */
 449                 req->req.actual += size;
 450                 is_short = (size < ep->ep.maxpacket);
 451 #ifdef USB_TRACE
 452                 VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
 453                         ep->ep.name, size, is_short ? "/S" : "",
 454                         req, req->req.actual, req->req.length);
 455 #endif
 456                 while (likely(size-- != 0)) {
 457                         u8      byte = (u8) readl(ep->reg_fifo);
 458
 459                         if (unlikely(bufferspace == 0)) {
 460                                 /* this happens when the driver's buffer
 461                                  * is smaller than what the host sent.
 462                                  * discard the extra data in this packet.
 463                                  */
 464                                 if (req->req.status != -EOVERFLOW)
 465                                         DBG(ep->dev, "%s overflow %u\n",
 466                                                 ep->ep.name, size);
 467                                 req->req.status = -EOVERFLOW;
 468                         } else {
 469                                 *buf++ = byte;
 470                                 bufferspace--;
 471                         }
 472                 }
 473
 474                 /* completion */
 475                 if (unlikely(is_short || req->req.actual == req->req.length)) {
 476                         if (unlikely(ep->num == 0)) {
 477                                 /* non-control endpoints now usable? */
 478                                 if (ep->dev->req_config)
 479                                         writel(ep->dev->configured
 480                                                         ? USBSTATE_CONFIGURED
 481                                                         : 0,
 482                                                 &regs->UsbState);
 483                                 /* ep0out status stage */
 484                                 writel(~(1<<0), &regs->EOP);
 485                                 ep->stopped = 1;
 486                                 ep->dev->ep0state = EP0_STATUS;
 487                         }
 488                         done(ep, req, 0);
 489
 490                         /* empty the second buffer asap */
 491                         if (dbuff && !list_empty(&ep->queue)) {
 492                                 req = list_entry(ep->queue.next,
 493                                                 struct goku_request, queue);
 494                                 goto top;
 495                         }
 496                         return 1;
 497                 }
 498         } while (dbuff);
 499         return 0;
 500 }
 501
 502 static inline void
 503 pio_irq_enable(struct goku_udc *dev,
 504                 struct goku_udc_regs __iomem *regs, int epnum)
 505 {
 506         dev->int_enable |= INT_EPxDATASET (epnum);
 507         writel(dev->int_enable, &regs->int_enable);
 508         /* write may still be posted */
 509 }
 510
 511 static inline void
 512 pio_irq_disable(struct goku_udc *dev,
 513                 struct goku_udc_regs __iomem *regs, int epnum)
 514 {
 515         dev->int_enable &= ~INT_EPxDATASET (epnum);
 516         writel(dev->int_enable, &regs->int_enable);
 517         /* write may still be posted */
 518 }
 519
 520 static inline void
 521 pio_advance(struct goku_ep *ep)
 522 {
 523         struct goku_request     *req;
 524
 525         if (unlikely(list_empty (&ep->queue)))
 526                 return;
 527         req = list_entry(ep->queue.next, struct goku_request, queue);
 528         (ep->is_in ? write_fifo : read_fifo)(ep, req);
 529 }
 530
 531
 532 /*-------------------------------------------------------------------------*/
 533
 534 // return:  0 = q running, 1 = q stopped, negative = errno
 535 static int start_dma(struct goku_ep *ep, struct goku_request *req)
 536 {
 537         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 538         u32                             master;
 539         u32                             start = req->req.dma;
 540         u32                             end = start + req->req.length - 1;
 541
 542         master = readl(&regs->dma_master) & MST_RW_BITS;
 543
 544         /* re-init the bits affecting IN dma; careful with zlps */
 545         if (likely(ep->is_in)) {
 546                 if (unlikely(master & MST_RD_ENA)) {
 547                         DBG (ep->dev, "start, IN active dma %03x!!\n",
 548                                 master);
 549 //                      return -EL2HLT;
 550                 }
 551                 writel(end, &regs->in_dma_end);
 552                 writel(start, &regs->in_dma_start);
 553
 554                 master &= ~MST_R_BITS;
 555                 if (unlikely(req->req.length == 0))
 556                         master = MST_RD_ENA | MST_RD_EOPB;
 557                 else if ((req->req.length % ep->ep.maxpacket) != 0
 558                                         || req->req.zero)
 559                         master = MST_RD_ENA | MST_EOPB_ENA;
 560                 else
 561                         master = MST_RD_ENA | MST_EOPB_DIS;
 562
 563                 ep->dev->int_enable |= INT_MSTRDEND;
 564
 565         /* Goku DMA-OUT merges short packets, which plays poorly with
 566          * protocols where short packets mark the transfer boundaries.
 567          * The chip supports a nonstandard policy with INT_MSTWRTMOUT,
 568          * ending transfers after 3 SOFs; we don't turn it on.
 569          */
 570         } else {
 571                 if (unlikely(master & MST_WR_ENA)) {
 572                         DBG (ep->dev, "start, OUT active dma %03x!!\n",
 573                                 master);
 574 //                      return -EL2HLT;
 575                 }
 576                 writel(end, &regs->out_dma_end);
 577                 writel(start, &regs->out_dma_start);
 578
 579                 master &= ~MST_W_BITS;
 580                 master |= MST_WR_ENA | MST_TIMEOUT_DIS;
 581
 582                 ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
 583         }
 584
 585         writel(master, &regs->dma_master);
 586         writel(ep->dev->int_enable, &regs->int_enable);
 587         return 0;
 588 }
 589
 590 static void dma_advance(struct goku_udc *dev, struct goku_ep *ep)
 591 {
 592         struct goku_request             *req;
 593         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 594         u32                             master;
 595
 596         master = readl(&regs->dma_master);
 597
 598         if (unlikely(list_empty(&ep->queue))) {
 599 stop:
 600                 if (ep->is_in)
 601                         dev->int_enable &= ~INT_MSTRDEND;
 602                 else
 603                         dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT);
 604                 writel(dev->int_enable, &regs->int_enable);
 605                 return;
 606         }
 607         req = list_entry(ep->queue.next, struct goku_request, queue);
 608
 609         /* normal hw dma completion (not abort) */
 610         if (likely(ep->is_in)) {
 611                 if (unlikely(master & MST_RD_ENA))
 612                         return;
 613                 req->req.actual = readl(&regs->in_dma_current);
 614         } else {
 615                 if (unlikely(master & MST_WR_ENA))
 616                         return;
 617
 618                 /* hardware merges short packets, and also hides packet
 619                  * overruns.  a partial packet MAY be in the fifo here.
 620                  */
 621                 req->req.actual = readl(&regs->out_dma_current);
 622         }
 623         req->req.actual -= req->req.dma;
 624         req->req.actual++;
 625
 626 #ifdef USB_TRACE
 627         VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n",
 628                 ep->ep.name, ep->is_in ? "IN" : "OUT",
 629                 req->req.actual, req->req.length, req);
 630 #endif
 631         done(ep, req, 0);
 632         if (list_empty(&ep->queue))
 633                 goto stop;
 634         req = list_entry(ep->queue.next, struct goku_request, queue);
 635         (void) start_dma(ep, req);
 636 }
 637
 638 static void abort_dma(struct goku_ep *ep, int status)
 639 {
 640         struct goku_udc_regs __iomem    *regs = ep->dev->regs;
 641         struct goku_request             *req;
 642         u32                             curr, master;
 643
 644         /* NAK future host requests, hoping the implicit delay lets the
 645          * dma engine finish reading (or writing) its latest packet and
 646          * empty the dma buffer (up to 16 bytes).
 647          *
 648          * This avoids needing to clean up a partial packet in the fifo;
 649          * we can't do that for IN without side effects to HALT and TOGGLE.
 650          */
 651         command(regs, COMMAND_FIFO_DISABLE, ep->num);
 652         req = list_entry(ep->queue.next, struct goku_request, queue);
 653         master = readl(&regs->dma_master) & MST_RW_BITS;
 654
 655         /* FIXME using these resets isn't usably documented. this may
 656          * not work unless it's followed by disabling the endpoint.
 657          *
 658          * FIXME the OUT reset path doesn't even behave consistently.
 659          */
 660         if (ep->is_in) {
 661                 if (unlikely((readl(&regs->dma_master) & MST_RD_ENA) == 0))
 662                         goto finished;
 663                 curr = readl(&regs->in_dma_current);
 664
 665                 writel(curr, &regs->in_dma_end);
 666                 writel(curr, &regs->in_dma_start);
 667
 668                 master &= ~MST_R_BITS;
 669                 master |= MST_RD_RESET;
 670                 writel(master, &regs->dma_master);
 671
 672                 if (readl(&regs->dma_master) & MST_RD_ENA)
 673                         DBG(ep->dev, "IN dma active after reset!\n");
 674
 675         } else {
 676                 if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
 677                         goto finished;
 678                 curr = readl(&regs->out_dma_current);
 679
 680                 writel(curr, &regs->out_dma_end);
 681                 writel(curr, &regs->out_dma_start);
 682
 683                 master &= ~MST_W_BITS;
 684                 master |= MST_WR_RESET;
 685                 writel(master, &regs->dma_master);
 686
 687                 if (readl(&regs->dma_master) & MST_WR_ENA)
 688                         DBG(ep->dev, "OUT dma active after reset!\n");
 689         }
 690         req->req.actual = (curr - req->req.dma) + 1;
 691         req->req.status = status;
 692
 693         VDBG(ep->dev, "%s %s %s %d/%d\n", __func__, ep->ep.name,
 694                 ep->is_in ? "IN" : "OUT",
 695                 req->req.actual, req->req.length);
 696
 697         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 698
 699         return;
 700
 701 finished:
 702         /* dma already completed; no abort needed */
 703         command(regs, COMMAND_FIFO_ENABLE, ep->num);
 704         req->req.actual = req->req.length;
 705         req->req.status = 0;
 706 }
 707
 708 /*-------------------------------------------------------------------------*/
 709
 710 static int
 711 goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 712 {
 713         struct goku_request     *req;
 714         struct goku_ep          *ep;
 715         struct goku_udc         *dev;
 716         unsigned long           flags;
 717         int                     status;
 718
 719         /* always require a cpu-view buffer so pio works */
 720         req = container_of(_req, struct goku_request, req);
 721         if (unlikely(!_req || !_req->complete
 722                         || !_req->buf || !list_empty(&req->queue)))
 723                 return -EINVAL;
 724         ep = container_of(_ep, struct goku_ep, ep);
 725         if (unlikely(!_ep || (!ep->desc && ep->num != 0)))
 726                 return -EINVAL;
 727         dev = ep->dev;
 728         if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
 729                 return -ESHUTDOWN;
 730
 731         /* can't touch registers when suspended */
 732         if (dev->ep0state == EP0_SUSPEND)
 733                 return -EBUSY;
 734
 735         /* set up dma mapping in case the caller didn't */
 736         if (ep->dma) {
 737                 status = usb_gadget_map_request(&dev->gadget, &req->req,
 738                                 ep->is_in);
 739                 if (status)
 740                         return status;
 741         }
 742
 743 #ifdef USB_TRACE
 744         VDBG(dev, "%s queue req %p, len %u buf %p\n",
 745                         _ep->name, _req, _req->length, _req->buf);
 746 #endif
 747
 748         spin_lock_irqsave(&dev->lock, flags);
 749
 750         _req->status = -EINPROGRESS;
 751         _req->actual = 0;
 752
 753         /* for ep0 IN without premature status, zlp is required and
 754          * writing EOP starts the status stage (OUT).
 755          */
 756         if (unlikely(ep->num == 0 && ep->is_in))
 757                 _req->zero = 1;
 758
 759         /* kickstart this i/o queue? */
 760         status = 0;
 761         if (list_empty(&ep->queue) && likely(!ep->stopped)) {
 762                 /* dma:  done after dma completion IRQ (or error)
 763                  * pio:  done after last fifo operation
 764                  */
 765                 if (ep->dma)
 766                         status = start_dma(ep, req);
 767                 else
 768                         status = (ep->is_in ? write_fifo : read_fifo)(ep, req);
 769
 770                 if (unlikely(status != 0)) {
 771                         if (status > 0)
 772                                 status = 0;
 773                         req = NULL;
 774                 }
 775
 776         } /* else pio or dma irq handler advances the queue. */
 777
 778         if (likely(req != 0))
 779                 list_add_tail(&req->queue, &ep->queue);
 780
 781         if (likely(!list_empty(&ep->queue))
 782                         && likely(ep->num != 0)
 783                         && !ep->dma
 784                         && !(dev->int_enable & INT_EPxDATASET (ep->num)))
 785                 pio_irq_enable(dev, dev->regs, ep->num);
 786
 787         spin_unlock_irqrestore(&dev->lock, flags);
 788
 789         /* pci writes may still be posted */
 790         return status;
 791 }
 792
 793 /* dequeue ALL requests */
 794 static void nuke(struct goku_ep *ep, int status)
 795 {
 796         struct goku_request     *req;
 797
 798         ep->stopped = 1;
 799         if (list_empty(&ep->queue))
 800                 return;
 801         if (ep->dma)
 802                 abort_dma(ep, status);
 803         while (!list_empty(&ep->queue)) {
 804                 req = list_entry(ep->queue.next, struct goku_request, queue);
 805                 done(ep, req, status);
 806         }
 807 }
 808
 809 /* dequeue JUST ONE request */
 810 static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 811 {
 812         struct goku_request     *req;
 813         struct goku_ep          *ep;
 814         struct goku_udc         *dev;
 815         unsigned long           flags;
 816
 817         ep = container_of(_ep, struct goku_ep, ep);
 818         if (!_ep || !_req || (!ep->desc && ep->num != 0))
 819                 return -EINVAL;
 820         dev = ep->dev;
 821         if (!dev->driver)
 822                 return -ESHUTDOWN;
 823
 824         /* we can't touch (dma) registers when suspended */
 825         if (dev->ep0state == EP0_SUSPEND)
 826                 return -EBUSY;
 827
 828         VDBG(dev, "%s %s %s %s %p\n", __func__, _ep->name,
 829                 ep->is_in ? "IN" : "OUT",
 830                 ep->dma ? "dma" : "pio",
 831                 _req);
 832
 833         spin_lock_irqsave(&dev->lock, flags);
 834
 835         /* make sure it's actually queued on this endpoint */
 836         list_for_each_entry (req, &ep->queue, queue) {
 837                 if (&req->req == _req)
 838                         break;
 839         }
 840         if (&req->req != _req) {
 841                 spin_unlock_irqrestore (&dev->lock, flags);
 842                 return -EINVAL;
 843         }
 844
 845         if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) {
 846                 abort_dma(ep, -ECONNRESET);
 847                 done(ep, req, -ECONNRESET);
 848                 dma_advance(dev, ep);
 849         } else if (!list_empty(&req->queue))
 850                 done(ep, req, -ECONNRESET);
 851         else
 852                 req = NULL;
 853         spin_unlock_irqrestore(&dev->lock, flags);
 854
 855         return req ? 0 : -EOPNOTSUPP;
 856 }
 857
 858 /*-------------------------------------------------------------------------*/
 859
 860 static void goku_clear_halt(struct goku_ep *ep)
 861 {
 862         // assert (ep->num !=0)
 863         VDBG(ep->dev, "%s clear halt\n", ep->ep.name);
 864         command(ep->dev->regs, COMMAND_SETDATA0, ep->num);
 865         command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num);
 866         if (ep->stopped) {
 867                 ep->stopped = 0;
 868                 if (ep->dma) {
 869                         struct goku_request     *req;
 870
 871                         if (list_empty(&ep->queue))
 872                                 return;
 873                         req = list_entry(ep->queue.next, struct goku_request,
 874                                                 queue);
 875                         (void) start_dma(ep, req);
 876                 } else
 877                         pio_advance(ep);
 878         }
 879 }
 880
 881 static int goku_set_halt(struct usb_ep *_ep, int value)
 882 {
 883         struct goku_ep  *ep;
 884         unsigned long   flags;
 885         int             retval = 0;
 886
 887         if (!_ep)
 888                 return -ENODEV;
 889         ep = container_of (_ep, struct goku_ep, ep);
 890
 891         if (ep->num == 0) {
 892                 if (value) {
 893                         ep->dev->ep0state = EP0_STALL;
 894                         ep->dev->ep[0].stopped = 1;
 895                 } else
 896                         return -EINVAL;
 897
 898         /* don't change EPxSTATUS_EP_INVALID to READY */
 899         } else if (!ep->desc) {
 900                 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
 901                 return -EINVAL;
 902         }
 903
 904         spin_lock_irqsave(&ep->dev->lock, flags);
 905         if (!list_empty(&ep->queue))
 906                 retval = -EAGAIN;
 907         else if (ep->is_in && value
 908                         /* data in (either) packet buffer? */
 909                         && (readl(&ep->dev->regs->DataSet)
 910                                         & DATASET_AB(ep->num)))
 911                 retval = -EAGAIN;
 912         else if (!value)
 913                 goku_clear_halt(ep);
 914         else {
 915                 ep->stopped = 1;
 916                 VDBG(ep->dev, "%s set halt\n", ep->ep.name);
 917                 command(ep->dev->regs, COMMAND_STALL, ep->num);
 918                 readl(ep->reg_status);
 919         }
 920         spin_unlock_irqrestore(&ep->dev->lock, flags);
 921         return retval;
 922 }
 923
 924 static int goku_fifo_status(struct usb_ep *_ep)
 925 {
 926         struct goku_ep                  *ep;
 927         struct goku_udc_regs __iomem    *regs;
 928         u32                             size;
 929
 930         if (!_ep)
 931                 return -ENODEV;
 932         ep = container_of(_ep, struct goku_ep, ep);
 933
 934         /* size is only reported sanely for OUT */
 935         if (ep->is_in)
 936                 return -EOPNOTSUPP;
 937
 938         /* ignores 16-byte dma buffer; SizeH == 0 */
 939         regs = ep->dev->regs;
 940         size = readl(&regs->EPxSizeLA[ep->num]) & DATASIZE;
 941         size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
 942         VDBG(ep->dev, "%s %s %u\n", __func__, ep->ep.name, size);
 943         return size;
 944 }
 945
 946 static void goku_fifo_flush(struct usb_ep *_ep)
 947 {
 948         struct goku_ep                  *ep;
 949         struct goku_udc_regs __iomem    *regs;
 950         u32                             size;
 951
 952         if (!_ep)
 953                 return;
 954         ep = container_of(_ep, struct goku_ep, ep);
 955         VDBG(ep->dev, "%s %s\n", __func__, ep->ep.name);
 956
 957         /* don't change EPxSTATUS_EP_INVALID to READY */
 958         if (!ep->desc && ep->num != 0) {
 959                 DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name);
 960                 return;
 961         }
 962
 963         regs = ep->dev->regs;
 964         size = readl(&regs->EPxSizeLA[ep->num]);
 965         size &= DATASIZE;
 966
 967         /* Non-desirable behavior:  FIFO_CLEAR also clears the
 968          * endpoint halt feature.  For OUT, we _could_ just read
 969          * the bytes out (PIO, if !ep->dma); for in, no choice.
 970          */
 971         if (size)
 972                 command(regs, COMMAND_FIFO_CLEAR, ep->num);
 973 }
 974
 975 static struct usb_ep_ops goku_ep_ops = {
 976         .enable         = goku_ep_enable,
 977         .disable        = goku_ep_disable,
 978
 979         .alloc_request  = goku_alloc_request,
 980         .free_request   = goku_free_request,
 981
 982         .queue          = goku_queue,
 983         .dequeue        = goku_dequeue,
 984
 985         .set_halt       = goku_set_halt,
 986         .fifo_status    = goku_fifo_status,
 987         .fifo_flush     = goku_fifo_flush,
 988 };
 989
 990 /*-------------------------------------------------------------------------*/
 991
 992 static int goku_get_frame(struct usb_gadget *_gadget)
 993 {
 994         return -EOPNOTSUPP;
 995 }
 996
 997 static int goku_start(struct usb_gadget_driver *driver,
 998                 int (*bind)(struct usb_gadget *));
 999 static int goku_stop(struct usb_gadget_driver *driver);
1000
1001 static const struct usb_gadget_ops goku_ops = {
1002         .get_frame      = goku_get_frame,
1003         .start          = goku_start,
1004         .stop           = goku_stop,
1005         // no remote wakeup
1006         // not selfpowered
1007 };
1008
1009 /*-------------------------------------------------------------------------*/
1010
1011 static inline char *dmastr(void)
1012 {
1013         if (use_dma == 0)
1014                 return "(dma disabled)";
1015         else if (use_dma == 2)
1016                 return "(dma IN and OUT)";
1017         else
1018                 return "(dma IN)";
1019 }
1020
1021 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1022
1023 static const char proc_node_name [] = "driver/udc";
1024
1025 #define FOURBITS "%s%s%s%s"
1026 #define EIGHTBITS FOURBITS FOURBITS
1027
1028 static void
1029 dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
1030 {
1031         int t;
1032
1033         /* int_status is the same format ... */
1034         t = scnprintf(*next, *size,
1035                 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
1036                 label, mask,
1037                 (mask & INT_PWRDETECT) ? " power" : "",
1038                 (mask & INT_SYSERROR) ? " sys" : "",
1039                 (mask & INT_MSTRDEND) ? " in-dma" : "",
1040                 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "",
1041
1042                 (mask & INT_MSTWREND) ? " out-dma" : "",
1043                 (mask & INT_MSTWRSET) ? " wrset" : "",
1044                 (mask & INT_ERR) ? " err" : "",
1045                 (mask & INT_SOF) ? " sof" : "",
1046
1047                 (mask & INT_EP3NAK) ? " ep3nak" : "",
1048                 (mask & INT_EP2NAK) ? " ep2nak" : "",
1049                 (mask & INT_EP1NAK) ? " ep1nak" : "",
1050                 (mask & INT_EP3DATASET) ? " ep3" : "",
1051
1052                 (mask & INT_EP2DATASET) ? " ep2" : "",
1053                 (mask & INT_EP1DATASET) ? " ep1" : "",
1054                 (mask & INT_STATUSNAK) ? " ep0snak" : "",
1055                 (mask & INT_STATUS) ? " ep0status" : "",
1056
1057                 (mask & INT_SETUP) ? " setup" : "",
1058                 (mask & INT_ENDPOINT0) ? " ep0" : "",
1059                 (mask & INT_USBRESET) ? " reset" : "",
1060                 (mask & INT_SUSPEND) ? " suspend" : "");
1061         *size -= t;
1062         *next += t;
1063 }
1064
1065
1066 static int
1067 udc_proc_read(char *buffer, char **start, off_t off, int count,
1068                 int *eof, void *_dev)
1069 {
1070         char                            *buf = buffer;
1071         struct goku_udc                 *dev = _dev;
1072         struct goku_udc_regs __iomem    *regs = dev->regs;
1073         char                            *next = buf;
1074         unsigned                        size = count;
1075         unsigned long                   flags;
1076         int                             i, t, is_usb_connected;
1077         u32                             tmp;
1078
1079         if (off != 0)
1080                 return 0;
1081
1082         local_irq_save(flags);
1083
1084         /* basic device status */
1085         tmp = readl(&regs->power_detect);
1086         is_usb_connected = tmp & PW_DETECT;
1087         t = scnprintf(next, size,
1088                 "%s - %s\n"
1089                 "%s version: %s %s\n"
1090                 "Gadget driver: %s\n"
1091                 "Host %s, %s\n"
1092                 "\n",
1093                 pci_name(dev->pdev), driver_desc,
1094                 driver_name, DRIVER_VERSION, dmastr(),
1095                 dev->driver ? dev->driver->driver.name : "(none)",
1096                 is_usb_connected
1097                         ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
1098                         : "disconnected",
1099                 ({char *state;
1100                 switch(dev->ep0state){
1101                 case EP0_DISCONNECT:    state = "ep0_disconnect"; break;
1102                 case EP0_IDLE:          state = "ep0_idle"; break;
1103                 case EP0_IN:            state = "ep0_in"; break;
1104                 case EP0_OUT:           state = "ep0_out"; break;
1105                 case EP0_STATUS:        state = "ep0_status"; break;
1106                 case EP0_STALL:         state = "ep0_stall"; break;
1107                 case EP0_SUSPEND:       state = "ep0_suspend"; break;
1108                 default:                state = "ep0_?"; break;
1109                 } state; })
1110                 );
1111         size -= t;
1112         next += t;
1113
1114         dump_intmask("int_status", readl(&regs->int_status), &next, &size);
1115         dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
1116
1117         if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
1118                 goto done;
1119
1120         /* registers for (active) device and ep0 */
1121         t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
1122                         "single.bcs %02x.%02x state %x addr %u\n",
1123                         dev->irqs, readl(&regs->DataSet),
1124                         readl(&regs->EPxSingle), readl(&regs->EPxBCS),
1125                         readl(&regs->UsbState),
1126                         readl(&regs->address));
1127         size -= t;
1128         next += t;
1129
1130         tmp = readl(&regs->dma_master);
1131         t = scnprintf(next, size,
1132                 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
1133                 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
1134                 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
1135                 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "",
1136                 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "",
1137
1138                 (tmp & MST_RD_EOPB) ? " eopb" : "",
1139                 (tmp & MST_RD_RESET) ? " in_reset" : "",
1140                 (tmp & MST_WR_RESET) ? " out_reset" : "",
1141                 (tmp & MST_RD_ENA) ? " IN" : "",
1142
1143                 (tmp & MST_WR_ENA) ? " OUT" : "",
1144                 (tmp & MST_CONNECTION)
1145                         ? "ep1in/ep2out"
1146                         : "ep1out/ep2in");
1147         size -= t;
1148         next += t;
1149
1150         /* dump endpoint queues */
1151         for (i = 0; i < 4; i++) {
1152                 struct goku_ep          *ep = &dev->ep [i];
1153                 struct goku_request     *req;
1154
1155                 if (i && !ep->desc)
1156                         continue;
1157
1158                 tmp = readl(ep->reg_status);
1159                 t = scnprintf(next, size,
1160                         "%s %s max %u %s, irqs %lu, "
1161                         "status %02x (%s) " FOURBITS "\n",
1162                         ep->ep.name,
1163                         ep->is_in ? "in" : "out",
1164                         ep->ep.maxpacket,
1165                         ep->dma ? "dma" : "pio",
1166                         ep->irqs,
1167                         tmp, ({ char *s;
1168                         switch (tmp & EPxSTATUS_EP_MASK) {
1169                         case EPxSTATUS_EP_READY:
1170                                 s = "ready"; break;
1171                         case EPxSTATUS_EP_DATAIN:
1172                                 s = "packet"; break;
1173                         case EPxSTATUS_EP_FULL:
1174                                 s = "full"; break;
1175                         case EPxSTATUS_EP_TX_ERR:       // host will retry
1176                                 s = "tx_err"; break;
1177                         case EPxSTATUS_EP_RX_ERR:
1178                                 s = "rx_err"; break;
1179                         case EPxSTATUS_EP_BUSY:         /* ep0 only */
1180                                 s = "busy"; break;
1181                         case EPxSTATUS_EP_STALL:
1182                                 s = "stall"; break;
1183                         case EPxSTATUS_EP_INVALID:      // these "can't happen"
1184                                 s = "invalid"; break;
1185                         default:
1186                                 s = "?"; break;
1187                         }; s; }),
1188                         (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
1189                         (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
1190                         (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
1191                         (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
1192                         );
1193                 if (t <= 0 || t > size)
1194                         goto done;
1195                 size -= t;
1196                 next += t;
1197
1198                 if (list_empty(&ep->queue)) {
1199                         t = scnprintf(next, size, "\t(nothing queued)\n");
1200                         if (t <= 0 || t > size)
1201                                 goto done;
1202                         size -= t;
1203                         next += t;
1204                         continue;
1205                 }
1206                 list_for_each_entry(req, &ep->queue, queue) {
1207                         if (ep->dma && req->queue.prev == &ep->queue) {
1208                                 if (i == UDC_MSTRD_ENDPOINT)
1209                                         tmp = readl(&regs->in_dma_current);
1210                                 else
1211                                         tmp = readl(&regs->out_dma_current);
1212                                 tmp -= req->req.dma;
1213                                 tmp++;
1214                         } else
1215                                 tmp = req->req.actual;
1216
1217                         t = scnprintf(next, size,
1218                                 "\treq %p len %u/%u buf %p\n",
1219                                 &req->req, tmp, req->req.length,
1220                                 req->req.buf);
1221                         if (t <= 0 || t > size)
1222                                 goto done;
1223                         size -= t;
1224                         next += t;
1225                 }
1226         }
1227
1228 done:
1229         local_irq_restore(flags);
1230         *eof = 1;
1231         return count - size;
1232 }
1233
1234 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
1235
1236 /*-------------------------------------------------------------------------*/
1237
1238 static void udc_reinit (struct goku_udc *dev)
1239 {
1240         static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" };
1241
1242         unsigned i;
1243
1244         INIT_LIST_HEAD (&dev->gadget.ep_list);
1245         dev->gadget.ep0 = &dev->ep [0].ep;
1246         dev->gadget.speed = USB_SPEED_UNKNOWN;
1247         dev->ep0state = EP0_DISCONNECT;
1248         dev->irqs = 0;
1249
1250         for (i = 0; i < 4; i++) {
1251                 struct goku_ep  *ep = &dev->ep[i];
1252
1253                 ep->num = i;
1254                 ep->ep.name = names[i];
1255                 ep->reg_fifo = &dev->regs->ep_fifo [i];
1256                 ep->reg_status = &dev->regs->ep_status [i];
1257                 ep->reg_mode = &dev->regs->ep_mode[i];
1258
1259                 ep->ep.ops = &goku_ep_ops;
1260                 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1261                 ep->dev = dev;
1262                 INIT_LIST_HEAD (&ep->queue);
1263
1264                 ep_reset(NULL, ep);
1265         }
1266
1267         dev->ep[0].reg_mode = NULL;
1268         dev->ep[0].ep.maxpacket = MAX_EP0_SIZE;
1269         list_del_init (&dev->ep[0].ep.ep_list);
1270 }
1271
1272 static void udc_reset(struct goku_udc *dev)
1273 {
1274         struct goku_udc_regs __iomem    *regs = dev->regs;
1275
1276         writel(0, &regs->power_detect);
1277         writel(0, &regs->int_enable);
1278         readl(&regs->int_enable);
1279         dev->int_enable = 0;
1280
1281         /* deassert reset, leave USB D+ at hi-Z (no pullup)
1282          * don't let INT_PWRDETECT sequence begin
1283          */
1284         udelay(250);
1285         writel(PW_RESETB, &regs->power_detect);
1286         readl(&regs->int_enable);
1287 }
1288
1289 static void ep0_start(struct goku_udc *dev)
1290 {
1291         struct goku_udc_regs __iomem    *regs = dev->regs;
1292         unsigned                        i;
1293
1294         VDBG(dev, "%s\n", __func__);
1295
1296         udc_reset(dev);
1297         udc_reinit (dev);
1298         //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->dma_master);
1299
1300         /* hw handles set_address, set_feature, get_status; maybe more */
1301         writel(   G_REQMODE_SET_INTF | G_REQMODE_GET_INTF
1302                 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF
1303                 | G_REQMODE_GET_DESC
1304                 | G_REQMODE_CLEAR_FEAT
1305                 , &regs->reqmode);
1306
1307         for (i = 0; i < 4; i++)
1308                 dev->ep[i].irqs = 0;
1309
1310         /* can't modify descriptors after writing UsbReady */
1311         for (i = 0; i < DESC_LEN; i++)
1312                 writel(0, &regs->descriptors[i]);
1313         writel(0, &regs->UsbReady);
1314
1315         /* expect ep0 requests when the host drops reset */
1316         writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
1317         dev->int_enable = INT_DEVWIDE | INT_EP0;
1318         writel(dev->int_enable, &dev->regs->int_enable);
1319         readl(&regs->int_enable);
1320         dev->gadget.speed = USB_SPEED_FULL;
1321         dev->ep0state = EP0_IDLE;
1322 }
1323
1324 static void udc_enable(struct goku_udc *dev)
1325 {
1326         /* start enumeration now, or after power detect irq */
1327         if (readl(&dev->regs->power_detect) & PW_DETECT)
1328                 ep0_start(dev);
1329         else {
1330                 DBG(dev, "%s\n", __func__);
1331                 dev->int_enable = INT_PWRDETECT;
1332                 writel(dev->int_enable, &dev->regs->int_enable);
1333         }
1334 }
1335
1336 /*-------------------------------------------------------------------------*/
1337
1338 /* keeping it simple:
1339  * - one bus driver, initted first;
1340  * - one function driver, initted second
1341  */
1342
1343 static struct goku_udc  *the_controller;
1344
1345 /* when a driver is successfully registered, it will receive
1346  * control requests including set_configuration(), which enables
1347  * non-control requests.  then usb traffic follows until a
1348  * disconnect is reported.  then a host may connect again, or
1349  * the driver might get unbound.
1350  */
1351 static int goku_start(struct usb_gadget_driver *driver,
1352                 int (*bind)(struct usb_gadget *))
1353 {
1354         struct goku_udc *dev = the_controller;
1355         int                     retval;
1356
1357         if (!driver
1358                         || driver->max_speed < USB_SPEED_FULL
1359                         || !bind
1360                         || !driver->disconnect
1361                         || !driver->setup)
1362                 return -EINVAL;
1363         if (!dev)
1364                 return -ENODEV;
1365         if (dev->driver)
1366                 return -EBUSY;
1367
1368         /* hook up the driver */
1369         driver->driver.bus = NULL;
1370         dev->driver = driver;
1371         dev->gadget.dev.driver = &driver->driver;
1372         retval = bind(&dev->gadget);
1373         if (retval) {
1374                 DBG(dev, "bind to driver %s --> error %d\n",
1375                                 driver->driver.name, retval);
1376                 dev->driver = NULL;
1377                 dev->gadget.dev.driver = NULL;
1378                 return retval;
1379         }
1380
1381         /* then enable host detection and ep0; and we're ready
1382          * for set_configuration as well as eventual disconnect.
1383          */
1384         udc_enable(dev);
1385
1386         DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
1387         return 0;
1388 }
1389
1390 static void
1391 stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
1392 {
1393         unsigned        i;
1394
1395         DBG (dev, "%s\n", __func__);
1396
1397         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1398                 driver = NULL;
1399
1400         /* disconnect gadget driver after quiesceing hw and the driver */
1401         udc_reset (dev);
1402         for (i = 0; i < 4; i++)
1403                 nuke(&dev->ep [i], -ESHUTDOWN);
1404         if (driver) {
1405                 spin_unlock(&dev->lock);
1406                 driver->disconnect(&dev->gadget);
1407                 spin_lock(&dev->lock);
1408         }
1409
1410         if (dev->driver)
1411                 udc_enable(dev);
1412 }
1413
1414 static int goku_stop(struct usb_gadget_driver *driver)
1415 {
1416         struct goku_udc *dev = the_controller;
1417         unsigned long   flags;
1418
1419         if (!dev)
1420                 return -ENODEV;
1421         if (!driver || driver != dev->driver || !driver->unbind)
1422                 return -EINVAL;
1423
1424         spin_lock_irqsave(&dev->lock, flags);
1425         dev->driver = NULL;
1426         stop_activity(dev, driver);
1427         spin_unlock_irqrestore(&dev->lock, flags);
1428
1429         driver->unbind(&dev->gadget);
1430         dev->gadget.dev.driver = NULL;
1431
1432         DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
1433         return 0;
1434 }
1435
1436 /*-------------------------------------------------------------------------*/
1437
1438 static void ep0_setup(struct goku_udc *dev)
1439 {
1440         struct goku_udc_regs __iomem    *regs = dev->regs;
1441         struct usb_ctrlrequest          ctrl;
1442         int                             tmp;
1443
1444         /* read SETUP packet and enter DATA stage */
1445         ctrl.bRequestType = readl(&regs->bRequestType);
1446         ctrl.bRequest = readl(&regs->bRequest);
1447         ctrl.wValue  = cpu_to_le16((readl(&regs->wValueH)  << 8)
1448                                         | readl(&regs->wValueL));
1449         ctrl.wIndex  = cpu_to_le16((readl(&regs->wIndexH)  << 8)
1450                                         | readl(&regs->wIndexL));
1451         ctrl.wLength = cpu_to_le16((readl(&regs->wLengthH) << 8)
1452                                         | readl(&regs->wLengthL));
1453         writel(0, &regs->SetupRecv);
1454
1455         nuke(&dev->ep[0], 0);
1456         dev->ep[0].stopped = 0;
1457         if (likely(ctrl.bRequestType & USB_DIR_IN)) {
1458                 dev->ep[0].is_in = 1;
1459                 dev->ep0state = EP0_IN;
1460                 /* detect early status stages */
1461                 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl);
1462         } else {
1463                 dev->ep[0].is_in = 0;
1464                 dev->ep0state = EP0_OUT;
1465
1466                 /* NOTE:  CLEAR_FEATURE is done in software so that we can
1467                  * synchronize transfer restarts after bulk IN stalls.  data
1468                  * won't even enter the fifo until the halt is cleared.
1469                  */
1470                 switch (ctrl.bRequest) {
1471                 case USB_REQ_CLEAR_FEATURE:
1472                         switch (ctrl.bRequestType) {
1473                         case USB_RECIP_ENDPOINT:
1474                                 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f;
1475                                 /* active endpoint */
1476                                 if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
1477                                         goto stall;
1478                                 if (ctrl.wIndex & cpu_to_le16(
1479                                                 USB_DIR_IN)) {
1480                                         if (!dev->ep[tmp].is_in)
1481                                                 goto stall;
1482                                 } else {
1483                                         if (dev->ep[tmp].is_in)
1484                                                 goto stall;
1485                                 }
1486                                 if (ctrl.wValue != cpu_to_le16(
1487                                                 USB_ENDPOINT_HALT))
1488                                         goto stall;
1489                                 if (tmp)
1490                                         goku_clear_halt(&dev->ep[tmp]);
1491 succeed:
1492                                 /* start ep0out status stage */
1493                                 writel(~(1<<0), &regs->EOP);
1494                                 dev->ep[0].stopped = 1;
1495                                 dev->ep0state = EP0_STATUS;
1496                                 return;
1497                         case USB_RECIP_DEVICE:
1498                                 /* device remote wakeup: always clear */
1499                                 if (ctrl.wValue != cpu_to_le16(1))
1500                                         goto stall;
1501                                 VDBG(dev, "clear dev remote wakeup\n");
1502                                 goto succeed;
1503                         case USB_RECIP_INTERFACE:
1504                                 goto stall;
1505                         default:                /* pass to gadget driver */
1506                                 break;
1507                         }
1508                         break;
1509                 default:
1510                         break;
1511                 }
1512         }
1513
1514 #ifdef USB_TRACE
1515         VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1516                 ctrl.bRequestType, ctrl.bRequest,
1517                 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex),
1518                 le16_to_cpu(ctrl.wLength));
1519 #endif
1520
1521         /* hw wants to know when we're configured (or not) */
1522         dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION
1523                                 && ctrl.bRequestType == USB_RECIP_DEVICE);
1524         if (unlikely(dev->req_config))
1525                 dev->configured = (ctrl.wValue != cpu_to_le16(0));
1526
1527         /* delegate everything to the gadget driver.
1528          * it may respond after this irq handler returns.
1529          */
1530         spin_unlock (&dev->lock);
1531         tmp = dev->driver->setup(&dev->gadget, &ctrl);
1532         spin_lock (&dev->lock);
1533         if (unlikely(tmp < 0)) {
1534 stall:
1535 #ifdef USB_TRACE
1536                 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n",
1537                                 ctrl.bRequestType, ctrl.bRequest, tmp);
1538 #endif
1539                 command(regs, COMMAND_STALL, 0);
1540                 dev->ep[0].stopped = 1;
1541                 dev->ep0state = EP0_STALL;
1542         }
1543
1544         /* expect at least one data or status stage irq */
1545 }
1546
1547 #define ACK(irqbit) { \
1548                 stat &= ~irqbit; \
1549                 writel(~irqbit, &regs->int_status); \
1550                 handled = 1; \
1551                 }
1552
1553 static irqreturn_t goku_irq(int irq, void *_dev)
1554 {
1555         struct goku_udc                 *dev = _dev;
1556         struct goku_udc_regs __iomem    *regs = dev->regs;
1557         struct goku_ep                  *ep;
1558         u32                             stat, handled = 0;
1559         unsigned                        i, rescans = 5;
1560
1561         spin_lock(&dev->lock);
1562
1563 rescan:
1564         stat = readl(&regs->int_status) & dev->int_enable;
1565         if (!stat)
1566                 goto done;
1567         dev->irqs++;
1568
1569         /* device-wide irqs */
1570         if (unlikely(stat & INT_DEVWIDE)) {
1571                 if (stat & INT_SYSERROR) {
1572                         ERROR(dev, "system error\n");
1573                         stop_activity(dev, dev->driver);
1574                         stat = 0;
1575                         handled = 1;
1576                         // FIXME have a neater way to prevent re-enumeration
1577                         dev->driver = NULL;
1578                         goto done;
1579                 }
1580                 if (stat & INT_PWRDETECT) {
1581                         writel(~stat, &regs->int_status);
1582                         if (readl(&dev->regs->power_detect) & PW_DETECT) {
1583                                 VDBG(dev, "connect\n");
1584                                 ep0_start(dev);
1585                         } else {
1586                                 DBG(dev, "disconnect\n");
1587                                 if (dev->gadget.speed == USB_SPEED_FULL)
1588                                         stop_activity(dev, dev->driver);
1589                                 dev->ep0state = EP0_DISCONNECT;
1590                                 dev->int_enable = INT_DEVWIDE;
1591                                 writel(dev->int_enable, &dev->regs->int_enable);
1592                         }
1593                         stat = 0;
1594                         handled = 1;
1595                         goto done;
1596                 }
1597                 if (stat & INT_SUSPEND) {
1598                         ACK(INT_SUSPEND);
1599                         if (readl(&regs->ep_status[0]) & EPxSTATUS_SUSPEND) {
1600                                 switch (dev->ep0state) {
1601                                 case EP0_DISCONNECT:
1602                                 case EP0_SUSPEND:
1603                                         goto pm_next;
1604                                 default:
1605                                         break;
1606                                 }
1607                                 DBG(dev, "USB suspend\n");
1608                                 dev->ep0state = EP0_SUSPEND;
1609                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1610                                                 && dev->driver
1611                                                 && dev->driver->suspend) {
1612                                         spin_unlock(&dev->lock);
1613                                         dev->driver->suspend(&dev->gadget);
1614                                         spin_lock(&dev->lock);
1615                                 }
1616                         } else {
1617                                 if (dev->ep0state != EP0_SUSPEND) {
1618                                         DBG(dev, "bogus USB resume %d\n",
1619                                                 dev->ep0state);
1620                                         goto pm_next;
1621                                 }
1622                                 DBG(dev, "USB resume\n");
1623                                 dev->ep0state = EP0_IDLE;
1624                                 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1625                                                 && dev->driver
1626                                                 && dev->driver->resume) {
1627                                         spin_unlock(&dev->lock);
1628                                         dev->driver->resume(&dev->gadget);
1629                                         spin_lock(&dev->lock);
1630                                 }
1631                         }
1632                 }
1633 pm_next:
1634                 if (stat & INT_USBRESET) {              /* hub reset done */
1635                         ACK(INT_USBRESET);
1636                         INFO(dev, "USB reset done, gadget %s\n",
1637                                 dev->driver->driver.name);
1638                 }
1639                 // and INT_ERR on some endpoint's crc/bitstuff/... problem
1640         }
1641
1642         /* progress ep0 setup, data, or status stages.
1643          * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs
1644          */
1645         if (stat & INT_SETUP) {
1646                 ACK(INT_SETUP);
1647                 dev->ep[0].irqs++;
1648                 ep0_setup(dev);
1649         }
1650         if (stat & INT_STATUSNAK) {
1651                 ACK(INT_STATUSNAK|INT_ENDPOINT0);
1652                 if (dev->ep0state == EP0_IN) {
1653                         ep = &dev->ep[0];
1654                         ep->irqs++;
1655                         nuke(ep, 0);
1656                         writel(~(1<<0), &regs->EOP);
1657                         dev->ep0state = EP0_STATUS;
1658                 }
1659         }
1660         if (stat & INT_ENDPOINT0) {
1661                 ACK(INT_ENDPOINT0);
1662                 ep = &dev->ep[0];
1663                 ep->irqs++;
1664                 pio_advance(ep);
1665         }
1666
1667         /* dma completion */
1668         if (stat & INT_MSTRDEND) {      /* IN */
1669                 ACK(INT_MSTRDEND);
1670                 ep = &dev->ep[UDC_MSTRD_ENDPOINT];
1671                 ep->irqs++;
1672                 dma_advance(dev, ep);
1673         }
1674         if (stat & INT_MSTWREND) {      /* OUT */
1675                 ACK(INT_MSTWREND);
1676                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1677                 ep->irqs++;
1678                 dma_advance(dev, ep);
1679         }
1680         if (stat & INT_MSTWRTMOUT) {    /* OUT */
1681                 ACK(INT_MSTWRTMOUT);
1682                 ep = &dev->ep[UDC_MSTWR_ENDPOINT];
1683                 ep->irqs++;
1684                 ERROR(dev, "%s write timeout ?\n", ep->ep.name);
1685                 // reset dma? then dma_advance()
1686         }
1687
1688         /* pio */
1689         for (i = 1; i < 4; i++) {
1690                 u32             tmp = INT_EPxDATASET(i);
1691
1692                 if (!(stat & tmp))
1693                         continue;
1694                 ep = &dev->ep[i];
1695                 pio_advance(ep);
1696                 if (list_empty (&ep->queue))
1697                         pio_irq_disable(dev, regs, i);
1698                 stat &= ~tmp;
1699                 handled = 1;
1700                 ep->irqs++;
1701         }
1702
1703         if (rescans--)
1704                 goto rescan;
1705
1706 done:
1707         (void)readl(&regs->int_enable);
1708         spin_unlock(&dev->lock);
1709         if (stat)
1710                 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
1711                                 readl(&regs->int_status), dev->int_enable);
1712         return IRQ_RETVAL(handled);
1713 }
1714
1715 #undef ACK
1716
1717 /*-------------------------------------------------------------------------*/
1718
1719 static void gadget_release(struct device *_dev)
1720 {
1721         struct goku_udc *dev = dev_get_drvdata(_dev);
1722
1723         kfree(dev);
1724 }
1725
1726 /* tear down the binding between this driver and the pci device */
1727
1728 static void goku_remove(struct pci_dev *pdev)
1729 {
1730         struct goku_udc         *dev = pci_get_drvdata(pdev);
1731
1732         DBG(dev, "%s\n", __func__);
1733
1734         usb_del_gadget_udc(&dev->gadget);
1735
1736         BUG_ON(dev->driver);
1737
1738 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1739         remove_proc_entry(proc_node_name, NULL);
1740 #endif
1741         if (dev->regs)
1742                 udc_reset(dev);
1743         if (dev->got_irq)
1744                 free_irq(pdev->irq, dev);
1745         if (dev->regs)
1746                 iounmap(dev->regs);
1747         if (dev->got_region)
1748                 release_mem_region(pci_resource_start (pdev, 0),
1749                                 pci_resource_len (pdev, 0));
1750         if (dev->enabled)
1751                 pci_disable_device(pdev);
1752         if (dev->registered)
1753                 device_unregister(&dev->gadget.dev);
1754
1755         pci_set_drvdata(pdev, NULL);
1756         dev->regs = NULL;
1757         the_controller = NULL;
1758
1759         INFO(dev, "unbind\n");
1760 }
1761
1762 /* wrap this driver around the specified pci device, but
1763  * don't respond over USB until a gadget driver binds to us.
1764  */
1765
1766 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1767 {
1768         struct goku_udc         *dev = NULL;
1769         unsigned long           resource, len;
1770         void __iomem            *base = NULL;
1771         int                     retval;
1772
1773         /* if you want to support more than one controller in a system,
1774          * usb_gadget_driver_{register,unregister}() must change.
1775          */
1776         if (the_controller) {
1777                 pr_warning("ignoring %s\n", pci_name(pdev));
1778                 return -EBUSY;
1779         }
1780         if (!pdev->irq) {
1781                 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
1782                 retval = -ENODEV;
1783                 goto err;
1784         }
1785
1786         /* alloc, and start init */
1787         dev = kzalloc (sizeof *dev, GFP_KERNEL);
1788         if (dev == NULL){
1789                 pr_debug("enomem %s\n", pci_name(pdev));
1790                 retval = -ENOMEM;
1791                 goto err;
1792         }
1793
1794         spin_lock_init(&dev->lock);
1795         dev->pdev = pdev;
1796         dev->gadget.ops = &goku_ops;
1797         dev->gadget.max_speed = USB_SPEED_FULL;
1798
1799         /* the "gadget" abstracts/virtualizes the controller */
1800         dev_set_name(&dev->gadget.dev, "gadget");
1801         dev->gadget.dev.parent = &pdev->dev;
1802         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
1803         dev->gadget.dev.release = gadget_release;
1804         dev->gadget.name = driver_name;
1805
1806         /* now all the pci goodies ... */
1807         retval = pci_enable_device(pdev);
1808         if (retval < 0) {
1809                 DBG(dev, "can't enable, %d\n", retval);
1810                 goto err;
1811         }
1812         dev->enabled = 1;
1813
1814         resource = pci_resource_start(pdev, 0);
1815         len = pci_resource_len(pdev, 0);
1816         if (!request_mem_region(resource, len, driver_name)) {
1817                 DBG(dev, "controller already in use\n");
1818                 retval = -EBUSY;
1819                 goto err;
1820         }
1821         dev->got_region = 1;
1822
1823         base = ioremap_nocache(resource, len);
1824         if (base == NULL) {
1825                 DBG(dev, "can't map memory\n");
1826                 retval = -EFAULT;
1827                 goto err;
1828         }
1829         dev->regs = (struct goku_udc_regs __iomem *) base;
1830
1831         pci_set_drvdata(pdev, dev);
1832         INFO(dev, "%s\n", driver_desc);
1833         INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
1834         INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
1835
1836         /* init to known state, then setup irqs */
1837         udc_reset(dev);
1838         udc_reinit (dev);
1839         if (request_irq(pdev->irq, goku_irq, IRQF_SHARED/*|IRQF_SAMPLE_RANDOM*/,
1840                         driver_name, dev) != 0) {
1841                 DBG(dev, "request interrupt %d failed\n", pdev->irq);
1842                 retval = -EBUSY;
1843                 goto err;
1844         }
1845         dev->got_irq = 1;
1846         if (use_dma)
1847                 pci_set_master(pdev);
1848
1849
1850 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1851         create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
1852 #endif
1853
1854         the_controller = dev;
1855         retval = device_register(&dev->gadget.dev);
1856         if (retval) {
1857                 put_device(&dev->gadget.dev);
1858                 goto err;
1859         }
1860         dev->registered = 1;
1861         retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget);
1862         if (retval)
1863                 goto err;
1864
1865         return 0;
1866
1867 err:
1868         if (dev)
1869                 goku_remove (pdev);
1870         return retval;
1871 }
1872
1873
1874 /*-------------------------------------------------------------------------*/
1875
1876 static const struct pci_device_id pci_ids[] = { {
1877         .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
1878         .class_mask =   ~0,
1879         .vendor =       0x102f,         /* Toshiba */
1880         .device =       0x0107,         /* this UDC */
1881         .subvendor =    PCI_ANY_ID,
1882         .subdevice =    PCI_ANY_ID,
1883
1884 }, { /* end: all zeroes */ }
1885 };
1886 MODULE_DEVICE_TABLE (pci, pci_ids);
1887
1888 static struct pci_driver goku_pci_driver = {
1889         .name =         (char *) driver_name,
1890         .id_table =     pci_ids,
1891
1892         .probe =        goku_probe,
1893         .remove =       goku_remove,
1894
1895         /* FIXME add power management support */
1896 };
1897
1898 static int __init init (void)
1899 {
1900         return pci_register_driver (&goku_pci_driver);
1901 }
1902 module_init (init);
1903
1904 static void __exit cleanup (void)
1905 {
1906         pci_unregister_driver (&goku_pci_driver);
1907 }
1908 module_exit (cleanup);