1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Toshiba TC86C001 ("Goku-S") USB Device Controller driver 4 * 5 * Copyright (C) 2000-2002 Lineo 6 * by Stuart Lynne, Tom Rushworth, and Bruce Balden 7 * Copyright (C) 2002 Toshiba Corporation 8 * Copyright (C) 2003 MontaVista Software (source@mvista.com) 9 */ 10 11 /* 12 * This device has ep0 and three semi-configurable bulk/interrupt endpoints. 13 * 14 * - Endpoint numbering is fixed: ep{1,2,3}-bulk 15 * - Gadget drivers can choose ep maxpacket (8/16/32/64) 16 * - Gadget drivers can choose direction (IN, OUT) 17 * - DMA works with ep1 (OUT transfers) and ep2 (IN transfers). 18 */ 19 20 // #define VERBOSE /* extra debug messages (success too) */ 21 // #define USB_TRACE /* packet-level success messages */ 22 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <linux/pci.h> 26 #include <linux/delay.h> 27 #include <linux/ioport.h> 28 #include <linux/slab.h> 29 #include <linux/errno.h> 30 #include <linux/timer.h> 31 #include <linux/list.h> 32 #include <linux/interrupt.h> 33 #include <linux/proc_fs.h> 34 #include <linux/seq_file.h> 35 #include <linux/device.h> 36 #include <linux/usb/ch9.h> 37 #include <linux/usb/gadget.h> 38 #include <linux/prefetch.h> 39 40 #include <asm/byteorder.h> 41 #include <asm/io.h> 42 #include <asm/irq.h> 43 #include <asm/unaligned.h> 44 45 46 #include "goku_udc.h" 47 48 #define DRIVER_DESC "TC86C001 USB Device Controller" 49 #define DRIVER_VERSION "30-Oct 2003" 50 51 static const char driver_name [] = "goku_udc"; 52 static const char driver_desc [] = DRIVER_DESC; 53 54 MODULE_AUTHOR("source@mvista.com"); 55 MODULE_DESCRIPTION(DRIVER_DESC); 56 MODULE_LICENSE("GPL"); 57 58 59 /* 60 * IN dma behaves ok under testing, though the IN-dma abort paths don't 61 * seem to behave quite as expected. Used by default. 62 * 63 * OUT dma documents design problems handling the common "short packet" 64 * transfer termination policy; it couldn't be enabled by default, even 65 * if the OUT-dma abort problems had a resolution. 66 */ 67 static unsigned use_dma = 1; 68 69 #if 0 70 //#include <linux/moduleparam.h> 71 /* "modprobe goku_udc use_dma=1" etc 72 * 0 to disable dma 73 * 1 to use IN dma only (normal operation) 74 * 2 to use IN and OUT dma 75 */ 76 module_param(use_dma, uint, S_IRUGO); 77 #endif 78 79 /*-------------------------------------------------------------------------*/ 80 81 static void nuke(struct goku_ep *, int status); 82 83 static inline void 84 command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum) 85 { 86 writel(COMMAND_EP(epnum) | command, ®s->Command); 87 udelay(300); 88 } 89 90 static int 91 goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) 92 { 93 struct goku_udc *dev; 94 struct goku_ep *ep; 95 u32 mode; 96 u16 max; 97 unsigned long flags; 98 99 ep = container_of(_ep, struct goku_ep, ep); 100 if (!_ep || !desc 101 || desc->bDescriptorType != USB_DT_ENDPOINT) 102 return -EINVAL; 103 dev = ep->dev; 104 if (ep == &dev->ep[0]) 105 return -EINVAL; 106 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) 107 return -ESHUTDOWN; 108 if (ep->num != usb_endpoint_num(desc)) 109 return -EINVAL; 110 111 switch (usb_endpoint_type(desc)) { 112 case USB_ENDPOINT_XFER_BULK: 113 case USB_ENDPOINT_XFER_INT: 114 break; 115 default: 116 return -EINVAL; 117 } 118 119 if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK) 120 != EPxSTATUS_EP_INVALID) 121 return -EBUSY; 122 123 /* enabling the no-toggle interrupt mode would need an api hook */ 124 mode = 0; 125 max = get_unaligned_le16(&desc->wMaxPacketSize); 126 switch (max) { 127 case 64: 128 mode++; 129 fallthrough; 130 case 32: 131 mode++; 132 fallthrough; 133 case 16: 134 mode++; 135 fallthrough; 136 case 8: 137 mode <<= 3; 138 break; 139 default: 140 return -EINVAL; 141 } 142 mode |= 2 << 1; /* bulk, or intr-with-toggle */ 143 144 /* ep1/ep2 dma direction is chosen early; it works in the other 145 * direction, with pio. be cautious with out-dma. 146 */ 147 ep->is_in = usb_endpoint_dir_in(desc); 148 if (ep->is_in) { 149 mode |= 1; 150 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT); 151 } else { 152 ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT); 153 if (ep->dma) 154 DBG(dev, "%s out-dma hides short packets\n", 155 ep->ep.name); 156 } 157 158 spin_lock_irqsave(&ep->dev->lock, flags); 159 160 /* ep1 and ep2 can do double buffering and/or dma */ 161 if (ep->num < 3) { 162 struct goku_udc_regs __iomem *regs = ep->dev->regs; 163 u32 tmp; 164 165 /* double buffer except (for now) with pio in */ 166 tmp = ((ep->dma || !ep->is_in) 167 ? 0x10 /* double buffered */ 168 : 0x11 /* single buffer */ 169 ) << ep->num; 170 tmp |= readl(®s->EPxSingle); 171 writel(tmp, ®s->EPxSingle); 172 173 tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num; 174 tmp |= readl(®s->EPxBCS); 175 writel(tmp, ®s->EPxBCS); 176 } 177 writel(mode, ep->reg_mode); 178 command(ep->dev->regs, COMMAND_RESET, ep->num); 179 ep->ep.maxpacket = max; 180 ep->stopped = 0; 181 ep->ep.desc = desc; 182 spin_unlock_irqrestore(&ep->dev->lock, flags); 183 184 DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name, 185 ep->is_in ? "IN" : "OUT", 186 ep->dma ? "dma" : "pio", 187 max); 188 189 return 0; 190 } 191 192 static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep) 193 { 194 struct goku_udc *dev = ep->dev; 195 196 if (regs) { 197 command(regs, COMMAND_INVALID, ep->num); 198 if (ep->num) { 199 if (ep->num == UDC_MSTWR_ENDPOINT) 200 dev->int_enable &= ~(INT_MSTWREND 201 |INT_MSTWRTMOUT); 202 else if (ep->num == UDC_MSTRD_ENDPOINT) 203 dev->int_enable &= ~INT_MSTRDEND; 204 dev->int_enable &= ~INT_EPxDATASET (ep->num); 205 } else 206 dev->int_enable &= ~INT_EP0; 207 writel(dev->int_enable, ®s->int_enable); 208 readl(®s->int_enable); 209 if (ep->num < 3) { 210 struct goku_udc_regs __iomem *r = ep->dev->regs; 211 u32 tmp; 212 213 tmp = readl(&r->EPxSingle); 214 tmp &= ~(0x11 << ep->num); 215 writel(tmp, &r->EPxSingle); 216 217 tmp = readl(&r->EPxBCS); 218 tmp &= ~(0x11 << ep->num); 219 writel(tmp, &r->EPxBCS); 220 } 221 /* reset dma in case we're still using it */ 222 if (ep->dma) { 223 u32 master; 224 225 master = readl(®s->dma_master) & MST_RW_BITS; 226 if (ep->num == UDC_MSTWR_ENDPOINT) { 227 master &= ~MST_W_BITS; 228 master |= MST_WR_RESET; 229 } else { 230 master &= ~MST_R_BITS; 231 master |= MST_RD_RESET; 232 } 233 writel(master, ®s->dma_master); 234 } 235 } 236 237 usb_ep_set_maxpacket_limit(&ep->ep, MAX_FIFO_SIZE); 238 ep->ep.desc = NULL; 239 ep->stopped = 1; 240 ep->irqs = 0; 241 ep->dma = 0; 242 } 243 244 static int goku_ep_disable(struct usb_ep *_ep) 245 { 246 struct goku_ep *ep; 247 struct goku_udc *dev; 248 unsigned long flags; 249 250 ep = container_of(_ep, struct goku_ep, ep); 251 if (!_ep || !ep->ep.desc) 252 return -ENODEV; 253 dev = ep->dev; 254 if (dev->ep0state == EP0_SUSPEND) 255 return -EBUSY; 256 257 VDBG(dev, "disable %s\n", _ep->name); 258 259 spin_lock_irqsave(&dev->lock, flags); 260 nuke(ep, -ESHUTDOWN); 261 ep_reset(dev->regs, ep); 262 spin_unlock_irqrestore(&dev->lock, flags); 263 264 return 0; 265 } 266 267 /*-------------------------------------------------------------------------*/ 268 269 static struct usb_request * 270 goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) 271 { 272 struct goku_request *req; 273 274 if (!_ep) 275 return NULL; 276 req = kzalloc(sizeof *req, gfp_flags); 277 if (!req) 278 return NULL; 279 280 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 usb_gadget_giveback_request(&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), ®s->int_status); 428 429 set = readl(®s->DataSet) & DATASET_AB(ep->num); 430 size = readl(®s->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(®s->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 ®s->UsbState); 483 /* ep0out status stage */ 484 writel(~(1<<0), ®s->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, ®s->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, ®s->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(®s->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, ®s->in_dma_end); 552 writel(start, ®s->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, ®s->out_dma_end); 577 writel(start, ®s->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, ®s->dma_master); 586 writel(ep->dev->int_enable, ®s->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(®s->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, ®s->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(®s->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(®s->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(®s->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(®s->dma_master) & MST_RD_ENA) == 0)) 662 goto finished; 663 curr = readl(®s->in_dma_current); 664 665 writel(curr, ®s->in_dma_end); 666 writel(curr, ®s->in_dma_start); 667 668 master &= ~MST_R_BITS; 669 master |= MST_RD_RESET; 670 writel(master, ®s->dma_master); 671 672 if (readl(®s->dma_master) & MST_RD_ENA) 673 DBG(ep->dev, "IN dma active after reset!\n"); 674 675 } else { 676 if (unlikely((readl(®s->dma_master) & MST_WR_ENA) == 0)) 677 goto finished; 678 curr = readl(®s->out_dma_current); 679 680 writel(curr, ®s->out_dma_end); 681 writel(curr, ®s->out_dma_start); 682 683 master &= ~MST_W_BITS; 684 master |= MST_WR_RESET; 685 writel(master, ®s->dma_master); 686 687 if (readl(®s->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->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 != NULL)) 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->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->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(®s->EPxSizeLA[ep->num]) & DATASIZE; 941 size += readl(®s->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->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(®s->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 const 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 struct usb_ep *goku_match_ep(struct usb_gadget *g, 998 struct usb_endpoint_descriptor *desc, 999 struct usb_ss_ep_comp_descriptor *ep_comp) 1000 { 1001 struct goku_udc *dev = to_goku_udc(g); 1002 struct usb_ep *ep; 1003 1004 switch (usb_endpoint_type(desc)) { 1005 case USB_ENDPOINT_XFER_INT: 1006 /* single buffering is enough */ 1007 ep = &dev->ep[3].ep; 1008 if (usb_gadget_ep_match_desc(g, ep, desc, ep_comp)) 1009 return ep; 1010 break; 1011 case USB_ENDPOINT_XFER_BULK: 1012 if (usb_endpoint_dir_in(desc)) { 1013 /* DMA may be available */ 1014 ep = &dev->ep[2].ep; 1015 if (usb_gadget_ep_match_desc(g, ep, desc, ep_comp)) 1016 return ep; 1017 } 1018 break; 1019 default: 1020 /* nothing */ ; 1021 } 1022 1023 return NULL; 1024 } 1025 1026 static int goku_udc_start(struct usb_gadget *g, 1027 struct usb_gadget_driver *driver); 1028 static int goku_udc_stop(struct usb_gadget *g); 1029 1030 static const struct usb_gadget_ops goku_ops = { 1031 .get_frame = goku_get_frame, 1032 .udc_start = goku_udc_start, 1033 .udc_stop = goku_udc_stop, 1034 .match_ep = goku_match_ep, 1035 // no remote wakeup 1036 // not selfpowered 1037 }; 1038 1039 /*-------------------------------------------------------------------------*/ 1040 1041 static inline const char *dmastr(void) 1042 { 1043 if (use_dma == 0) 1044 return "(dma disabled)"; 1045 else if (use_dma == 2) 1046 return "(dma IN and OUT)"; 1047 else 1048 return "(dma IN)"; 1049 } 1050 1051 #ifdef CONFIG_USB_GADGET_DEBUG_FILES 1052 1053 static const char proc_node_name [] = "driver/udc"; 1054 1055 #define FOURBITS "%s%s%s%s" 1056 #define EIGHTBITS FOURBITS FOURBITS 1057 1058 static void dump_intmask(struct seq_file *m, const char *label, u32 mask) 1059 { 1060 /* int_status is the same format ... */ 1061 seq_printf(m, "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n", 1062 label, mask, 1063 (mask & INT_PWRDETECT) ? " power" : "", 1064 (mask & INT_SYSERROR) ? " sys" : "", 1065 (mask & INT_MSTRDEND) ? " in-dma" : "", 1066 (mask & INT_MSTWRTMOUT) ? " wrtmo" : "", 1067 1068 (mask & INT_MSTWREND) ? " out-dma" : "", 1069 (mask & INT_MSTWRSET) ? " wrset" : "", 1070 (mask & INT_ERR) ? " err" : "", 1071 (mask & INT_SOF) ? " sof" : "", 1072 1073 (mask & INT_EP3NAK) ? " ep3nak" : "", 1074 (mask & INT_EP2NAK) ? " ep2nak" : "", 1075 (mask & INT_EP1NAK) ? " ep1nak" : "", 1076 (mask & INT_EP3DATASET) ? " ep3" : "", 1077 1078 (mask & INT_EP2DATASET) ? " ep2" : "", 1079 (mask & INT_EP1DATASET) ? " ep1" : "", 1080 (mask & INT_STATUSNAK) ? " ep0snak" : "", 1081 (mask & INT_STATUS) ? " ep0status" : "", 1082 1083 (mask & INT_SETUP) ? " setup" : "", 1084 (mask & INT_ENDPOINT0) ? " ep0" : "", 1085 (mask & INT_USBRESET) ? " reset" : "", 1086 (mask & INT_SUSPEND) ? " suspend" : ""); 1087 } 1088 1089 static const char *udc_ep_state(enum ep0state state) 1090 { 1091 switch (state) { 1092 case EP0_DISCONNECT: 1093 return "ep0_disconnect"; 1094 case EP0_IDLE: 1095 return "ep0_idle"; 1096 case EP0_IN: 1097 return "ep0_in"; 1098 case EP0_OUT: 1099 return "ep0_out"; 1100 case EP0_STATUS: 1101 return "ep0_status"; 1102 case EP0_STALL: 1103 return "ep0_stall"; 1104 case EP0_SUSPEND: 1105 return "ep0_suspend"; 1106 } 1107 1108 return "ep0_?"; 1109 } 1110 1111 static const char *udc_ep_status(u32 status) 1112 { 1113 switch (status & EPxSTATUS_EP_MASK) { 1114 case EPxSTATUS_EP_READY: 1115 return "ready"; 1116 case EPxSTATUS_EP_DATAIN: 1117 return "packet"; 1118 case EPxSTATUS_EP_FULL: 1119 return "full"; 1120 case EPxSTATUS_EP_TX_ERR: /* host will retry */ 1121 return "tx_err"; 1122 case EPxSTATUS_EP_RX_ERR: 1123 return "rx_err"; 1124 case EPxSTATUS_EP_BUSY: /* ep0 only */ 1125 return "busy"; 1126 case EPxSTATUS_EP_STALL: 1127 return "stall"; 1128 case EPxSTATUS_EP_INVALID: /* these "can't happen" */ 1129 return "invalid"; 1130 } 1131 1132 return "?"; 1133 } 1134 1135 static int udc_proc_read(struct seq_file *m, void *v) 1136 { 1137 struct goku_udc *dev = m->private; 1138 struct goku_udc_regs __iomem *regs = dev->regs; 1139 unsigned long flags; 1140 int i, is_usb_connected; 1141 u32 tmp; 1142 1143 local_irq_save(flags); 1144 1145 /* basic device status */ 1146 tmp = readl(®s->power_detect); 1147 is_usb_connected = tmp & PW_DETECT; 1148 seq_printf(m, 1149 "%s - %s\n" 1150 "%s version: %s %s\n" 1151 "Gadget driver: %s\n" 1152 "Host %s, %s\n" 1153 "\n", 1154 pci_name(dev->pdev), driver_desc, 1155 driver_name, DRIVER_VERSION, dmastr(), 1156 dev->driver ? dev->driver->driver.name : "(none)", 1157 is_usb_connected 1158 ? ((tmp & PW_PULLUP) ? "full speed" : "powered") 1159 : "disconnected", 1160 udc_ep_state(dev->ep0state)); 1161 1162 dump_intmask(m, "int_status", readl(®s->int_status)); 1163 dump_intmask(m, "int_enable", readl(®s->int_enable)); 1164 1165 if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0) 1166 goto done; 1167 1168 /* registers for (active) device and ep0 */ 1169 seq_printf(m, "\nirqs %lu\ndataset %02x single.bcs %02x.%02x state %x addr %u\n", 1170 dev->irqs, readl(®s->DataSet), 1171 readl(®s->EPxSingle), readl(®s->EPxBCS), 1172 readl(®s->UsbState), 1173 readl(®s->address)); 1174 if (seq_has_overflowed(m)) 1175 goto done; 1176 1177 tmp = readl(®s->dma_master); 1178 seq_printf(m, "dma %03X =" EIGHTBITS "%s %s\n", 1179 tmp, 1180 (tmp & MST_EOPB_DIS) ? " eopb-" : "", 1181 (tmp & MST_EOPB_ENA) ? " eopb+" : "", 1182 (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "", 1183 (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "", 1184 1185 (tmp & MST_RD_EOPB) ? " eopb" : "", 1186 (tmp & MST_RD_RESET) ? " in_reset" : "", 1187 (tmp & MST_WR_RESET) ? " out_reset" : "", 1188 (tmp & MST_RD_ENA) ? " IN" : "", 1189 1190 (tmp & MST_WR_ENA) ? " OUT" : "", 1191 (tmp & MST_CONNECTION) ? "ep1in/ep2out" : "ep1out/ep2in"); 1192 if (seq_has_overflowed(m)) 1193 goto done; 1194 1195 /* dump endpoint queues */ 1196 for (i = 0; i < 4; i++) { 1197 struct goku_ep *ep = &dev->ep [i]; 1198 struct goku_request *req; 1199 1200 if (i && !ep->ep.desc) 1201 continue; 1202 1203 tmp = readl(ep->reg_status); 1204 seq_printf(m, "%s %s max %u %s, irqs %lu, status %02x (%s) " FOURBITS "\n", 1205 ep->ep.name, 1206 ep->is_in ? "in" : "out", 1207 ep->ep.maxpacket, 1208 ep->dma ? "dma" : "pio", 1209 ep->irqs, 1210 tmp, udc_ep_status(tmp), 1211 (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0", 1212 (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "", 1213 (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "", 1214 (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""); 1215 if (seq_has_overflowed(m)) 1216 goto done; 1217 1218 if (list_empty(&ep->queue)) { 1219 seq_puts(m, "\t(nothing queued)\n"); 1220 if (seq_has_overflowed(m)) 1221 goto done; 1222 continue; 1223 } 1224 list_for_each_entry(req, &ep->queue, queue) { 1225 if (ep->dma && req->queue.prev == &ep->queue) { 1226 if (i == UDC_MSTRD_ENDPOINT) 1227 tmp = readl(®s->in_dma_current); 1228 else 1229 tmp = readl(®s->out_dma_current); 1230 tmp -= req->req.dma; 1231 tmp++; 1232 } else 1233 tmp = req->req.actual; 1234 1235 seq_printf(m, "\treq %p len %u/%u buf %p\n", 1236 &req->req, tmp, req->req.length, 1237 req->req.buf); 1238 if (seq_has_overflowed(m)) 1239 goto done; 1240 } 1241 } 1242 1243 done: 1244 local_irq_restore(flags); 1245 return 0; 1246 } 1247 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */ 1248 1249 /*-------------------------------------------------------------------------*/ 1250 1251 static void udc_reinit (struct goku_udc *dev) 1252 { 1253 static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" }; 1254 1255 unsigned i; 1256 1257 INIT_LIST_HEAD (&dev->gadget.ep_list); 1258 dev->gadget.ep0 = &dev->ep [0].ep; 1259 dev->gadget.speed = USB_SPEED_UNKNOWN; 1260 dev->ep0state = EP0_DISCONNECT; 1261 dev->irqs = 0; 1262 1263 for (i = 0; i < 4; i++) { 1264 struct goku_ep *ep = &dev->ep[i]; 1265 1266 ep->num = i; 1267 ep->ep.name = names[i]; 1268 ep->reg_fifo = &dev->regs->ep_fifo [i]; 1269 ep->reg_status = &dev->regs->ep_status [i]; 1270 ep->reg_mode = &dev->regs->ep_mode[i]; 1271 1272 ep->ep.ops = &goku_ep_ops; 1273 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list); 1274 ep->dev = dev; 1275 INIT_LIST_HEAD (&ep->queue); 1276 1277 ep_reset(NULL, ep); 1278 1279 if (i == 0) 1280 ep->ep.caps.type_control = true; 1281 else 1282 ep->ep.caps.type_bulk = true; 1283 1284 ep->ep.caps.dir_in = true; 1285 ep->ep.caps.dir_out = true; 1286 } 1287 1288 dev->ep[0].reg_mode = NULL; 1289 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, MAX_EP0_SIZE); 1290 list_del_init (&dev->ep[0].ep.ep_list); 1291 } 1292 1293 static void udc_reset(struct goku_udc *dev) 1294 { 1295 struct goku_udc_regs __iomem *regs = dev->regs; 1296 1297 writel(0, ®s->power_detect); 1298 writel(0, ®s->int_enable); 1299 readl(®s->int_enable); 1300 dev->int_enable = 0; 1301 1302 /* deassert reset, leave USB D+ at hi-Z (no pullup) 1303 * don't let INT_PWRDETECT sequence begin 1304 */ 1305 udelay(250); 1306 writel(PW_RESETB, ®s->power_detect); 1307 readl(®s->int_enable); 1308 } 1309 1310 static void ep0_start(struct goku_udc *dev) 1311 { 1312 struct goku_udc_regs __iomem *regs = dev->regs; 1313 unsigned i; 1314 1315 VDBG(dev, "%s\n", __func__); 1316 1317 udc_reset(dev); 1318 udc_reinit (dev); 1319 //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, ®s->dma_master); 1320 1321 /* hw handles set_address, set_feature, get_status; maybe more */ 1322 writel( G_REQMODE_SET_INTF | G_REQMODE_GET_INTF 1323 | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF 1324 | G_REQMODE_GET_DESC 1325 | G_REQMODE_CLEAR_FEAT 1326 , ®s->reqmode); 1327 1328 for (i = 0; i < 4; i++) 1329 dev->ep[i].irqs = 0; 1330 1331 /* can't modify descriptors after writing UsbReady */ 1332 for (i = 0; i < DESC_LEN; i++) 1333 writel(0, ®s->descriptors[i]); 1334 writel(0, ®s->UsbReady); 1335 1336 /* expect ep0 requests when the host drops reset */ 1337 writel(PW_RESETB | PW_PULLUP, ®s->power_detect); 1338 dev->int_enable = INT_DEVWIDE | INT_EP0; 1339 writel(dev->int_enable, &dev->regs->int_enable); 1340 readl(®s->int_enable); 1341 dev->gadget.speed = USB_SPEED_FULL; 1342 dev->ep0state = EP0_IDLE; 1343 } 1344 1345 static void udc_enable(struct goku_udc *dev) 1346 { 1347 /* start enumeration now, or after power detect irq */ 1348 if (readl(&dev->regs->power_detect) & PW_DETECT) 1349 ep0_start(dev); 1350 else { 1351 DBG(dev, "%s\n", __func__); 1352 dev->int_enable = INT_PWRDETECT; 1353 writel(dev->int_enable, &dev->regs->int_enable); 1354 } 1355 } 1356 1357 /*-------------------------------------------------------------------------*/ 1358 1359 /* keeping it simple: 1360 * - one bus driver, initted first; 1361 * - one function driver, initted second 1362 */ 1363 1364 /* when a driver is successfully registered, it will receive 1365 * control requests including set_configuration(), which enables 1366 * non-control requests. then usb traffic follows until a 1367 * disconnect is reported. then a host may connect again, or 1368 * the driver might get unbound. 1369 */ 1370 static int goku_udc_start(struct usb_gadget *g, 1371 struct usb_gadget_driver *driver) 1372 { 1373 struct goku_udc *dev = to_goku_udc(g); 1374 1375 /* hook up the driver */ 1376 driver->driver.bus = NULL; 1377 dev->driver = driver; 1378 1379 /* 1380 * then enable host detection and ep0; and we're ready 1381 * for set_configuration as well as eventual disconnect. 1382 */ 1383 udc_enable(dev); 1384 1385 return 0; 1386 } 1387 1388 static void stop_activity(struct goku_udc *dev) 1389 { 1390 unsigned i; 1391 1392 DBG (dev, "%s\n", __func__); 1393 1394 /* disconnect gadget driver after quiesceing hw and the driver */ 1395 udc_reset (dev); 1396 for (i = 0; i < 4; i++) 1397 nuke(&dev->ep [i], -ESHUTDOWN); 1398 1399 if (dev->driver) 1400 udc_enable(dev); 1401 } 1402 1403 static int goku_udc_stop(struct usb_gadget *g) 1404 { 1405 struct goku_udc *dev = to_goku_udc(g); 1406 unsigned long flags; 1407 1408 spin_lock_irqsave(&dev->lock, flags); 1409 dev->driver = NULL; 1410 stop_activity(dev); 1411 spin_unlock_irqrestore(&dev->lock, flags); 1412 1413 return 0; 1414 } 1415 1416 /*-------------------------------------------------------------------------*/ 1417 1418 static void ep0_setup(struct goku_udc *dev) 1419 { 1420 struct goku_udc_regs __iomem *regs = dev->regs; 1421 struct usb_ctrlrequest ctrl; 1422 int tmp; 1423 1424 /* read SETUP packet and enter DATA stage */ 1425 ctrl.bRequestType = readl(®s->bRequestType); 1426 ctrl.bRequest = readl(®s->bRequest); 1427 ctrl.wValue = cpu_to_le16((readl(®s->wValueH) << 8) 1428 | readl(®s->wValueL)); 1429 ctrl.wIndex = cpu_to_le16((readl(®s->wIndexH) << 8) 1430 | readl(®s->wIndexL)); 1431 ctrl.wLength = cpu_to_le16((readl(®s->wLengthH) << 8) 1432 | readl(®s->wLengthL)); 1433 writel(0, ®s->SetupRecv); 1434 1435 nuke(&dev->ep[0], 0); 1436 dev->ep[0].stopped = 0; 1437 if (likely(ctrl.bRequestType & USB_DIR_IN)) { 1438 dev->ep[0].is_in = 1; 1439 dev->ep0state = EP0_IN; 1440 /* detect early status stages */ 1441 writel(ICONTROL_STATUSNAK, &dev->regs->IntControl); 1442 } else { 1443 dev->ep[0].is_in = 0; 1444 dev->ep0state = EP0_OUT; 1445 1446 /* NOTE: CLEAR_FEATURE is done in software so that we can 1447 * synchronize transfer restarts after bulk IN stalls. data 1448 * won't even enter the fifo until the halt is cleared. 1449 */ 1450 switch (ctrl.bRequest) { 1451 case USB_REQ_CLEAR_FEATURE: 1452 switch (ctrl.bRequestType) { 1453 case USB_RECIP_ENDPOINT: 1454 tmp = le16_to_cpu(ctrl.wIndex) & 0x0f; 1455 /* active endpoint */ 1456 if (tmp > 3 || 1457 (!dev->ep[tmp].ep.desc && tmp != 0)) 1458 goto stall; 1459 if (ctrl.wIndex & cpu_to_le16( 1460 USB_DIR_IN)) { 1461 if (!dev->ep[tmp].is_in) 1462 goto stall; 1463 } else { 1464 if (dev->ep[tmp].is_in) 1465 goto stall; 1466 } 1467 if (ctrl.wValue != cpu_to_le16( 1468 USB_ENDPOINT_HALT)) 1469 goto stall; 1470 if (tmp) 1471 goku_clear_halt(&dev->ep[tmp]); 1472 succeed: 1473 /* start ep0out status stage */ 1474 writel(~(1<<0), ®s->EOP); 1475 dev->ep[0].stopped = 1; 1476 dev->ep0state = EP0_STATUS; 1477 return; 1478 case USB_RECIP_DEVICE: 1479 /* device remote wakeup: always clear */ 1480 if (ctrl.wValue != cpu_to_le16(1)) 1481 goto stall; 1482 VDBG(dev, "clear dev remote wakeup\n"); 1483 goto succeed; 1484 case USB_RECIP_INTERFACE: 1485 goto stall; 1486 default: /* pass to gadget driver */ 1487 break; 1488 } 1489 break; 1490 default: 1491 break; 1492 } 1493 } 1494 1495 #ifdef USB_TRACE 1496 VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n", 1497 ctrl.bRequestType, ctrl.bRequest, 1498 le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex), 1499 le16_to_cpu(ctrl.wLength)); 1500 #endif 1501 1502 /* hw wants to know when we're configured (or not) */ 1503 dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION 1504 && ctrl.bRequestType == USB_RECIP_DEVICE); 1505 if (unlikely(dev->req_config)) 1506 dev->configured = (ctrl.wValue != cpu_to_le16(0)); 1507 1508 /* delegate everything to the gadget driver. 1509 * it may respond after this irq handler returns. 1510 */ 1511 spin_unlock (&dev->lock); 1512 tmp = dev->driver->setup(&dev->gadget, &ctrl); 1513 spin_lock (&dev->lock); 1514 if (unlikely(tmp < 0)) { 1515 stall: 1516 #ifdef USB_TRACE 1517 VDBG(dev, "req %02x.%02x protocol STALL; err %d\n", 1518 ctrl.bRequestType, ctrl.bRequest, tmp); 1519 #endif 1520 command(regs, COMMAND_STALL, 0); 1521 dev->ep[0].stopped = 1; 1522 dev->ep0state = EP0_STALL; 1523 } 1524 1525 /* expect at least one data or status stage irq */ 1526 } 1527 1528 #define ACK(irqbit) { \ 1529 stat &= ~irqbit; \ 1530 writel(~irqbit, ®s->int_status); \ 1531 handled = 1; \ 1532 } 1533 1534 static irqreturn_t goku_irq(int irq, void *_dev) 1535 { 1536 struct goku_udc *dev = _dev; 1537 struct goku_udc_regs __iomem *regs = dev->regs; 1538 struct goku_ep *ep; 1539 u32 stat, handled = 0; 1540 unsigned i, rescans = 5; 1541 1542 spin_lock(&dev->lock); 1543 1544 rescan: 1545 stat = readl(®s->int_status) & dev->int_enable; 1546 if (!stat) 1547 goto done; 1548 dev->irqs++; 1549 1550 /* device-wide irqs */ 1551 if (unlikely(stat & INT_DEVWIDE)) { 1552 if (stat & INT_SYSERROR) { 1553 ERROR(dev, "system error\n"); 1554 stop_activity(dev); 1555 stat = 0; 1556 handled = 1; 1557 // FIXME have a neater way to prevent re-enumeration 1558 dev->driver = NULL; 1559 goto done; 1560 } 1561 if (stat & INT_PWRDETECT) { 1562 writel(~stat, ®s->int_status); 1563 if (readl(&dev->regs->power_detect) & PW_DETECT) { 1564 VDBG(dev, "connect\n"); 1565 ep0_start(dev); 1566 } else { 1567 DBG(dev, "disconnect\n"); 1568 if (dev->gadget.speed == USB_SPEED_FULL) 1569 stop_activity(dev); 1570 dev->ep0state = EP0_DISCONNECT; 1571 dev->int_enable = INT_DEVWIDE; 1572 writel(dev->int_enable, &dev->regs->int_enable); 1573 } 1574 stat = 0; 1575 handled = 1; 1576 goto done; 1577 } 1578 if (stat & INT_SUSPEND) { 1579 ACK(INT_SUSPEND); 1580 if (readl(®s->ep_status[0]) & EPxSTATUS_SUSPEND) { 1581 switch (dev->ep0state) { 1582 case EP0_DISCONNECT: 1583 case EP0_SUSPEND: 1584 goto pm_next; 1585 default: 1586 break; 1587 } 1588 DBG(dev, "USB suspend\n"); 1589 dev->ep0state = EP0_SUSPEND; 1590 if (dev->gadget.speed != USB_SPEED_UNKNOWN 1591 && dev->driver 1592 && dev->driver->suspend) { 1593 spin_unlock(&dev->lock); 1594 dev->driver->suspend(&dev->gadget); 1595 spin_lock(&dev->lock); 1596 } 1597 } else { 1598 if (dev->ep0state != EP0_SUSPEND) { 1599 DBG(dev, "bogus USB resume %d\n", 1600 dev->ep0state); 1601 goto pm_next; 1602 } 1603 DBG(dev, "USB resume\n"); 1604 dev->ep0state = EP0_IDLE; 1605 if (dev->gadget.speed != USB_SPEED_UNKNOWN 1606 && dev->driver 1607 && dev->driver->resume) { 1608 spin_unlock(&dev->lock); 1609 dev->driver->resume(&dev->gadget); 1610 spin_lock(&dev->lock); 1611 } 1612 } 1613 } 1614 pm_next: 1615 if (stat & INT_USBRESET) { /* hub reset done */ 1616 ACK(INT_USBRESET); 1617 INFO(dev, "USB reset done, gadget %s\n", 1618 dev->driver->driver.name); 1619 } 1620 // and INT_ERR on some endpoint's crc/bitstuff/... problem 1621 } 1622 1623 /* progress ep0 setup, data, or status stages. 1624 * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs 1625 */ 1626 if (stat & INT_SETUP) { 1627 ACK(INT_SETUP); 1628 dev->ep[0].irqs++; 1629 ep0_setup(dev); 1630 } 1631 if (stat & INT_STATUSNAK) { 1632 ACK(INT_STATUSNAK|INT_ENDPOINT0); 1633 if (dev->ep0state == EP0_IN) { 1634 ep = &dev->ep[0]; 1635 ep->irqs++; 1636 nuke(ep, 0); 1637 writel(~(1<<0), ®s->EOP); 1638 dev->ep0state = EP0_STATUS; 1639 } 1640 } 1641 if (stat & INT_ENDPOINT0) { 1642 ACK(INT_ENDPOINT0); 1643 ep = &dev->ep[0]; 1644 ep->irqs++; 1645 pio_advance(ep); 1646 } 1647 1648 /* dma completion */ 1649 if (stat & INT_MSTRDEND) { /* IN */ 1650 ACK(INT_MSTRDEND); 1651 ep = &dev->ep[UDC_MSTRD_ENDPOINT]; 1652 ep->irqs++; 1653 dma_advance(dev, ep); 1654 } 1655 if (stat & INT_MSTWREND) { /* OUT */ 1656 ACK(INT_MSTWREND); 1657 ep = &dev->ep[UDC_MSTWR_ENDPOINT]; 1658 ep->irqs++; 1659 dma_advance(dev, ep); 1660 } 1661 if (stat & INT_MSTWRTMOUT) { /* OUT */ 1662 ACK(INT_MSTWRTMOUT); 1663 ep = &dev->ep[UDC_MSTWR_ENDPOINT]; 1664 ep->irqs++; 1665 ERROR(dev, "%s write timeout ?\n", ep->ep.name); 1666 // reset dma? then dma_advance() 1667 } 1668 1669 /* pio */ 1670 for (i = 1; i < 4; i++) { 1671 u32 tmp = INT_EPxDATASET(i); 1672 1673 if (!(stat & tmp)) 1674 continue; 1675 ep = &dev->ep[i]; 1676 pio_advance(ep); 1677 if (list_empty (&ep->queue)) 1678 pio_irq_disable(dev, regs, i); 1679 stat &= ~tmp; 1680 handled = 1; 1681 ep->irqs++; 1682 } 1683 1684 if (rescans--) 1685 goto rescan; 1686 1687 done: 1688 (void)readl(®s->int_enable); 1689 spin_unlock(&dev->lock); 1690 if (stat) 1691 DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat, 1692 readl(®s->int_status), dev->int_enable); 1693 return IRQ_RETVAL(handled); 1694 } 1695 1696 #undef ACK 1697 1698 /*-------------------------------------------------------------------------*/ 1699 1700 static void gadget_release(struct device *_dev) 1701 { 1702 struct goku_udc *dev = dev_get_drvdata(_dev); 1703 1704 kfree(dev); 1705 } 1706 1707 /* tear down the binding between this driver and the pci device */ 1708 1709 static void goku_remove(struct pci_dev *pdev) 1710 { 1711 struct goku_udc *dev = pci_get_drvdata(pdev); 1712 1713 DBG(dev, "%s\n", __func__); 1714 1715 usb_del_gadget_udc(&dev->gadget); 1716 1717 BUG_ON(dev->driver); 1718 1719 #ifdef CONFIG_USB_GADGET_DEBUG_FILES 1720 remove_proc_entry(proc_node_name, NULL); 1721 #endif 1722 if (dev->regs) 1723 udc_reset(dev); 1724 if (dev->got_irq) 1725 free_irq(pdev->irq, dev); 1726 if (dev->regs) 1727 iounmap(dev->regs); 1728 if (dev->got_region) 1729 release_mem_region(pci_resource_start (pdev, 0), 1730 pci_resource_len (pdev, 0)); 1731 if (dev->enabled) 1732 pci_disable_device(pdev); 1733 1734 dev->regs = NULL; 1735 1736 INFO(dev, "unbind\n"); 1737 } 1738 1739 /* wrap this driver around the specified pci device, but 1740 * don't respond over USB until a gadget driver binds to us. 1741 */ 1742 1743 static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id) 1744 { 1745 struct goku_udc *dev = NULL; 1746 unsigned long resource, len; 1747 void __iomem *base = NULL; 1748 int retval; 1749 1750 if (!pdev->irq) { 1751 printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev)); 1752 retval = -ENODEV; 1753 goto err; 1754 } 1755 1756 /* alloc, and start init */ 1757 dev = kzalloc (sizeof *dev, GFP_KERNEL); 1758 if (!dev) { 1759 retval = -ENOMEM; 1760 goto err; 1761 } 1762 1763 pci_set_drvdata(pdev, dev); 1764 spin_lock_init(&dev->lock); 1765 dev->pdev = pdev; 1766 dev->gadget.ops = &goku_ops; 1767 dev->gadget.max_speed = USB_SPEED_FULL; 1768 1769 /* the "gadget" abstracts/virtualizes the controller */ 1770 dev->gadget.name = driver_name; 1771 1772 /* now all the pci goodies ... */ 1773 retval = pci_enable_device(pdev); 1774 if (retval < 0) { 1775 DBG(dev, "can't enable, %d\n", retval); 1776 goto err; 1777 } 1778 dev->enabled = 1; 1779 1780 resource = pci_resource_start(pdev, 0); 1781 len = pci_resource_len(pdev, 0); 1782 if (!request_mem_region(resource, len, driver_name)) { 1783 DBG(dev, "controller already in use\n"); 1784 retval = -EBUSY; 1785 goto err; 1786 } 1787 dev->got_region = 1; 1788 1789 base = ioremap(resource, len); 1790 if (base == NULL) { 1791 DBG(dev, "can't map memory\n"); 1792 retval = -EFAULT; 1793 goto err; 1794 } 1795 dev->regs = (struct goku_udc_regs __iomem *) base; 1796 1797 INFO(dev, "%s\n", driver_desc); 1798 INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr()); 1799 INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base); 1800 1801 /* init to known state, then setup irqs */ 1802 udc_reset(dev); 1803 udc_reinit (dev); 1804 if (request_irq(pdev->irq, goku_irq, IRQF_SHARED, 1805 driver_name, dev) != 0) { 1806 DBG(dev, "request interrupt %d failed\n", pdev->irq); 1807 retval = -EBUSY; 1808 goto err; 1809 } 1810 dev->got_irq = 1; 1811 if (use_dma) 1812 pci_set_master(pdev); 1813 1814 1815 #ifdef CONFIG_USB_GADGET_DEBUG_FILES 1816 proc_create_single_data(proc_node_name, 0, NULL, udc_proc_read, dev); 1817 #endif 1818 1819 retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget, 1820 gadget_release); 1821 if (retval) 1822 goto err; 1823 1824 return 0; 1825 1826 err: 1827 if (dev) 1828 goku_remove (pdev); 1829 /* gadget_release is not registered yet, kfree explicitly */ 1830 kfree(dev); 1831 return retval; 1832 } 1833 1834 1835 /*-------------------------------------------------------------------------*/ 1836 1837 static const struct pci_device_id pci_ids[] = { { 1838 .class = PCI_CLASS_SERIAL_USB_DEVICE, 1839 .class_mask = ~0, 1840 .vendor = 0x102f, /* Toshiba */ 1841 .device = 0x0107, /* this UDC */ 1842 .subvendor = PCI_ANY_ID, 1843 .subdevice = PCI_ANY_ID, 1844 1845 }, { /* end: all zeroes */ } 1846 }; 1847 MODULE_DEVICE_TABLE (pci, pci_ids); 1848 1849 static struct pci_driver goku_pci_driver = { 1850 .name = driver_name, 1851 .id_table = pci_ids, 1852 1853 .probe = goku_probe, 1854 .remove = goku_remove, 1855 1856 /* FIXME add power management support */ 1857 }; 1858 1859 module_pci_driver(goku_pci_driver); 1860