1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * omap_udc.c -- for OMAP full speed udc; most chips support OTG. 4 * 5 * Copyright (C) 2004 Texas Instruments, Inc. 6 * Copyright (C) 2004-2005 David Brownell 7 * 8 * OMAP2 & DMA support by Kyungmin Park <kyungmin.park@samsung.com> 9 */ 10 11#undef DEBUG 12#undef VERBOSE 13 14#include <linux/module.h> 15#include <linux/kernel.h> 16#include <linux/ioport.h> 17#include <linux/types.h> 18#include <linux/errno.h> 19#include <linux/delay.h> 20#include <linux/slab.h> 21#include <linux/timer.h> 22#include <linux/list.h> 23#include <linux/interrupt.h> 24#include <linux/proc_fs.h> 25#include <linux/mm.h> 26#include <linux/moduleparam.h> 27#include <linux/platform_device.h> 28#include <linux/usb/ch9.h> 29#include <linux/usb/gadget.h> 30#include <linux/usb/otg.h> 31#include <linux/dma-mapping.h> 32#include <linux/clk.h> 33#include <linux/err.h> 34#include <linux/prefetch.h> 35#include <linux/io.h> 36 37#include <asm/byteorder.h> 38#include <asm/irq.h> 39#include <asm/unaligned.h> 40#include <asm/mach-types.h> 41 42#include <linux/omap-dma.h> 43#include <linux/platform_data/usb-omap1.h> 44 45#include <linux/soc/ti/omap1-usb.h> 46#include <linux/soc/ti/omap1-soc.h> 47#include <linux/soc/ti/omap1-io.h> 48 49#include "omap_udc.h" 50 51#undef USB_TRACE 52 53/* bulk DMA seems to be behaving for both IN and OUT */ 54#define USE_DMA 55 56/* ISO too */ 57#define USE_ISO 58 59#define DRIVER_DESC "OMAP UDC driver" 60#define DRIVER_VERSION "4 October 2004" 61 62#define OMAP_DMA_USB_W2FC_TX0 29 63#define OMAP_DMA_USB_W2FC_RX0 26 64 65/* 66 * The OMAP UDC needs _very_ early endpoint setup: before enabling the 67 * D+ pullup to allow enumeration. That's too early for the gadget 68 * framework to use from usb_endpoint_enable(), which happens after 69 * enumeration as part of activating an interface. (But if we add an 70 * optional new "UDC not yet running" state to the gadget driver model, 71 * even just during driver binding, the endpoint autoconfig logic is the 72 * natural spot to manufacture new endpoints.) 73 * 74 * So instead of using endpoint enable calls to control the hardware setup, 75 * this driver defines a "fifo mode" parameter. It's used during driver 76 * initialization to choose among a set of pre-defined endpoint configs. 77 * See omap_udc_setup() for available modes, or to add others. That code 78 * lives in an init section, so use this driver as a module if you need 79 * to change the fifo mode after the kernel boots. 80 * 81 * Gadget drivers normally ignore endpoints they don't care about, and 82 * won't include them in configuration descriptors. That means only 83 * misbehaving hosts would even notice they exist. 84 */ 85#ifdef USE_ISO 86static unsigned fifo_mode = 3; 87#else 88static unsigned fifo_mode; 89#endif 90 91/* "modprobe omap_udc fifo_mode=42", or else as a kernel 92 * boot parameter "omap_udc:fifo_mode=42" 93 */ 94module_param(fifo_mode, uint, 0); 95MODULE_PARM_DESC(fifo_mode, "endpoint configuration"); 96 97#ifdef USE_DMA 98static bool use_dma = 1; 99 100/* "modprobe omap_udc use_dma=y", or else as a kernel 101 * boot parameter "omap_udc:use_dma=y" 102 */ 103module_param(use_dma, bool, 0); 104MODULE_PARM_DESC(use_dma, "enable/disable DMA"); 105#else /* !USE_DMA */ 106 107/* save a bit of code */ 108#define use_dma 0 109#endif /* !USE_DMA */ 110 111 112static const char driver_name[] = "omap_udc"; 113static const char driver_desc[] = DRIVER_DESC; 114 115/*-------------------------------------------------------------------------*/ 116 117/* there's a notion of "current endpoint" for modifying endpoint 118 * state, and PIO access to its FIFO. 119 */ 120 121static void use_ep(struct omap_ep *ep, u16 select) 122{ 123 u16 num = ep->bEndpointAddress & 0x0f; 124 125 if (ep->bEndpointAddress & USB_DIR_IN) 126 num |= UDC_EP_DIR; 127 omap_writew(num | select, UDC_EP_NUM); 128 /* when select, MUST deselect later !! */ 129} 130 131static inline void deselect_ep(void) 132{ 133 u16 w; 134 135 w = omap_readw(UDC_EP_NUM); 136 w &= ~UDC_EP_SEL; 137 omap_writew(w, UDC_EP_NUM); 138 /* 6 wait states before TX will happen */ 139} 140 141static void dma_channel_claim(struct omap_ep *ep, unsigned preferred); 142 143/*-------------------------------------------------------------------------*/ 144 145static int omap_ep_enable(struct usb_ep *_ep, 146 const struct usb_endpoint_descriptor *desc) 147{ 148 struct omap_ep *ep = container_of(_ep, struct omap_ep, ep); 149 struct omap_udc *udc; 150 unsigned long flags; 151 u16 maxp; 152 153 /* catch various bogus parameters */ 154 if (!_ep || !desc 155 || desc->bDescriptorType != USB_DT_ENDPOINT 156 || ep->bEndpointAddress != desc->bEndpointAddress 157 || ep->maxpacket < usb_endpoint_maxp(desc)) { 158 DBG("%s, bad ep or descriptor\n", __func__); 159 return -EINVAL; 160 } 161 maxp = usb_endpoint_maxp(desc); 162 if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK 163 && maxp != ep->maxpacket) 164 || usb_endpoint_maxp(desc) > ep->maxpacket 165 || !desc->wMaxPacketSize) { 166 DBG("%s, bad %s maxpacket\n", __func__, _ep->name); 167 return -ERANGE; 168 } 169 170#ifdef USE_ISO 171 if ((desc->bmAttributes == USB_ENDPOINT_XFER_ISOC 172 && desc->bInterval != 1)) { 173 /* hardware wants period = 1; USB allows 2^(Interval-1) */ 174 DBG("%s, unsupported ISO period %dms\n", _ep->name, 175 1 << (desc->bInterval - 1)); 176 return -EDOM; 177 } 178#else 179 if (desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) { 180 DBG("%s, ISO nyet\n", _ep->name); 181 return -EDOM; 182 } 183#endif 184 185 /* xfer types must match, except that interrupt ~= bulk */ 186 if (ep->bmAttributes != desc->bmAttributes 187 && ep->bmAttributes != USB_ENDPOINT_XFER_BULK 188 && desc->bmAttributes != USB_ENDPOINT_XFER_INT) { 189 DBG("%s, %s type mismatch\n", __func__, _ep->name); 190 return -EINVAL; 191 } 192 193 udc = ep->udc; 194 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) { 195 DBG("%s, bogus device state\n", __func__); 196 return -ESHUTDOWN; 197 } 198 199 spin_lock_irqsave(&udc->lock, flags); 200 201 ep->ep.desc = desc; 202 ep->irqs = 0; 203 ep->stopped = 0; 204 ep->ep.maxpacket = maxp; 205 206 /* set endpoint to initial state */ 207 ep->dma_channel = 0; 208 ep->has_dma = 0; 209 ep->lch = -1; 210 use_ep(ep, UDC_EP_SEL); 211 omap_writew(udc->clr_halt, UDC_CTRL); 212 ep->ackwait = 0; 213 deselect_ep(); 214 215 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) 216 list_add(&ep->iso, &udc->iso); 217 218 /* maybe assign a DMA channel to this endpoint */ 219 if (use_dma && desc->bmAttributes == USB_ENDPOINT_XFER_BULK) 220 /* FIXME ISO can dma, but prefers first channel */ 221 dma_channel_claim(ep, 0); 222 223 /* PIO OUT may RX packets */ 224 if (desc->bmAttributes != USB_ENDPOINT_XFER_ISOC 225 && !ep->has_dma 226 && !(ep->bEndpointAddress & USB_DIR_IN)) { 227 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 228 ep->ackwait = 1 + ep->double_buf; 229 } 230 231 spin_unlock_irqrestore(&udc->lock, flags); 232 VDBG("%s enabled\n", _ep->name); 233 return 0; 234} 235 236static void nuke(struct omap_ep *, int status); 237 238static int omap_ep_disable(struct usb_ep *_ep) 239{ 240 struct omap_ep *ep = container_of(_ep, struct omap_ep, ep); 241 unsigned long flags; 242 243 if (!_ep || !ep->ep.desc) { 244 DBG("%s, %s not enabled\n", __func__, 245 _ep ? ep->ep.name : NULL); 246 return -EINVAL; 247 } 248 249 spin_lock_irqsave(&ep->udc->lock, flags); 250 ep->ep.desc = NULL; 251 nuke(ep, -ESHUTDOWN); 252 ep->ep.maxpacket = ep->maxpacket; 253 ep->has_dma = 0; 254 omap_writew(UDC_SET_HALT, UDC_CTRL); 255 list_del_init(&ep->iso); 256 del_timer(&ep->timer); 257 258 spin_unlock_irqrestore(&ep->udc->lock, flags); 259 260 VDBG("%s disabled\n", _ep->name); 261 return 0; 262} 263 264/*-------------------------------------------------------------------------*/ 265 266static struct usb_request * 267omap_alloc_request(struct usb_ep *ep, gfp_t gfp_flags) 268{ 269 struct omap_req *req; 270 271 req = kzalloc(sizeof(*req), gfp_flags); 272 if (!req) 273 return NULL; 274 275 INIT_LIST_HEAD(&req->queue); 276 277 return &req->req; 278} 279 280static void 281omap_free_request(struct usb_ep *ep, struct usb_request *_req) 282{ 283 struct omap_req *req = container_of(_req, struct omap_req, req); 284 285 kfree(req); 286} 287 288/*-------------------------------------------------------------------------*/ 289 290static void 291done(struct omap_ep *ep, struct omap_req *req, int status) 292{ 293 struct omap_udc *udc = ep->udc; 294 unsigned stopped = ep->stopped; 295 296 list_del_init(&req->queue); 297 298 if (req->req.status == -EINPROGRESS) 299 req->req.status = status; 300 else 301 status = req->req.status; 302 303 if (use_dma && ep->has_dma) 304 usb_gadget_unmap_request(&udc->gadget, &req->req, 305 (ep->bEndpointAddress & USB_DIR_IN)); 306 307#ifndef USB_TRACE 308 if (status && status != -ESHUTDOWN) 309#endif 310 VDBG("complete %s req %p stat %d len %u/%u\n", 311 ep->ep.name, &req->req, status, 312 req->req.actual, req->req.length); 313 314 /* don't modify queue heads during completion callback */ 315 ep->stopped = 1; 316 spin_unlock(&ep->udc->lock); 317 usb_gadget_giveback_request(&ep->ep, &req->req); 318 spin_lock(&ep->udc->lock); 319 ep->stopped = stopped; 320} 321 322/*-------------------------------------------------------------------------*/ 323 324#define UDC_FIFO_FULL (UDC_NON_ISO_FIFO_FULL | UDC_ISO_FIFO_FULL) 325#define UDC_FIFO_UNWRITABLE (UDC_EP_HALTED | UDC_FIFO_FULL) 326 327#define FIFO_EMPTY (UDC_NON_ISO_FIFO_EMPTY | UDC_ISO_FIFO_EMPTY) 328#define FIFO_UNREADABLE (UDC_EP_HALTED | FIFO_EMPTY) 329 330static inline int 331write_packet(u8 *buf, struct omap_req *req, unsigned max) 332{ 333 unsigned len; 334 u16 *wp; 335 336 len = min(req->req.length - req->req.actual, max); 337 req->req.actual += len; 338 339 max = len; 340 if (likely((((int)buf) & 1) == 0)) { 341 wp = (u16 *)buf; 342 while (max >= 2) { 343 omap_writew(*wp++, UDC_DATA); 344 max -= 2; 345 } 346 buf = (u8 *)wp; 347 } 348 while (max--) 349 omap_writeb(*buf++, UDC_DATA); 350 return len; 351} 352 353/* FIXME change r/w fifo calling convention */ 354 355 356/* return: 0 = still running, 1 = completed, negative = errno */ 357static int write_fifo(struct omap_ep *ep, struct omap_req *req) 358{ 359 u8 *buf; 360 unsigned count; 361 int is_last; 362 u16 ep_stat; 363 364 buf = req->req.buf + req->req.actual; 365 prefetch(buf); 366 367 /* PIO-IN isn't double buffered except for iso */ 368 ep_stat = omap_readw(UDC_STAT_FLG); 369 if (ep_stat & UDC_FIFO_UNWRITABLE) 370 return 0; 371 372 count = ep->ep.maxpacket; 373 count = write_packet(buf, req, count); 374 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 375 ep->ackwait = 1; 376 377 /* last packet is often short (sometimes a zlp) */ 378 if (count != ep->ep.maxpacket) 379 is_last = 1; 380 else if (req->req.length == req->req.actual 381 && !req->req.zero) 382 is_last = 1; 383 else 384 is_last = 0; 385 386 /* NOTE: requests complete when all IN data is in a 387 * FIFO (or sometimes later, if a zlp was needed). 388 * Use usb_ep_fifo_status() where needed. 389 */ 390 if (is_last) 391 done(ep, req, 0); 392 return is_last; 393} 394 395static inline int 396read_packet(u8 *buf, struct omap_req *req, unsigned avail) 397{ 398 unsigned len; 399 u16 *wp; 400 401 len = min(req->req.length - req->req.actual, avail); 402 req->req.actual += len; 403 avail = len; 404 405 if (likely((((int)buf) & 1) == 0)) { 406 wp = (u16 *)buf; 407 while (avail >= 2) { 408 *wp++ = omap_readw(UDC_DATA); 409 avail -= 2; 410 } 411 buf = (u8 *)wp; 412 } 413 while (avail--) 414 *buf++ = omap_readb(UDC_DATA); 415 return len; 416} 417 418/* return: 0 = still running, 1 = queue empty, negative = errno */ 419static int read_fifo(struct omap_ep *ep, struct omap_req *req) 420{ 421 u8 *buf; 422 unsigned count, avail; 423 int is_last; 424 425 buf = req->req.buf + req->req.actual; 426 prefetchw(buf); 427 428 for (;;) { 429 u16 ep_stat = omap_readw(UDC_STAT_FLG); 430 431 is_last = 0; 432 if (ep_stat & FIFO_EMPTY) { 433 if (!ep->double_buf) 434 break; 435 ep->fnf = 1; 436 } 437 if (ep_stat & UDC_EP_HALTED) 438 break; 439 440 if (ep_stat & UDC_FIFO_FULL) 441 avail = ep->ep.maxpacket; 442 else { 443 avail = omap_readw(UDC_RXFSTAT); 444 ep->fnf = ep->double_buf; 445 } 446 count = read_packet(buf, req, avail); 447 448 /* partial packet reads may not be errors */ 449 if (count < ep->ep.maxpacket) { 450 is_last = 1; 451 /* overflowed this request? flush extra data */ 452 if (count != avail) { 453 req->req.status = -EOVERFLOW; 454 avail -= count; 455 while (avail--) 456 omap_readw(UDC_DATA); 457 } 458 } else if (req->req.length == req->req.actual) 459 is_last = 1; 460 else 461 is_last = 0; 462 463 if (!ep->bEndpointAddress) 464 break; 465 if (is_last) 466 done(ep, req, 0); 467 break; 468 } 469 return is_last; 470} 471 472/*-------------------------------------------------------------------------*/ 473 474static u16 dma_src_len(struct omap_ep *ep, dma_addr_t start) 475{ 476 dma_addr_t end; 477 478 /* IN-DMA needs this on fault/cancel paths, so 15xx misreports 479 * the last transfer's bytecount by more than a FIFO's worth. 480 */ 481 if (cpu_is_omap15xx()) 482 return 0; 483 484 end = omap_get_dma_src_pos(ep->lch); 485 if (end == ep->dma_counter) 486 return 0; 487 488 end |= start & (0xffff << 16); 489 if (end < start) 490 end += 0x10000; 491 return end - start; 492} 493 494static u16 dma_dest_len(struct omap_ep *ep, dma_addr_t start) 495{ 496 dma_addr_t end; 497 498 end = omap_get_dma_dst_pos(ep->lch); 499 if (end == ep->dma_counter) 500 return 0; 501 502 end |= start & (0xffff << 16); 503 if (cpu_is_omap15xx()) 504 end++; 505 if (end < start) 506 end += 0x10000; 507 return end - start; 508} 509 510 511/* Each USB transfer request using DMA maps to one or more DMA transfers. 512 * When DMA completion isn't request completion, the UDC continues with 513 * the next DMA transfer for that USB transfer. 514 */ 515 516static void next_in_dma(struct omap_ep *ep, struct omap_req *req) 517{ 518 u16 txdma_ctrl, w; 519 unsigned length = req->req.length - req->req.actual; 520 const int sync_mode = cpu_is_omap15xx() 521 ? OMAP_DMA_SYNC_FRAME 522 : OMAP_DMA_SYNC_ELEMENT; 523 int dma_trigger = 0; 524 525 /* measure length in either bytes or packets */ 526 if ((cpu_is_omap16xx() && length <= UDC_TXN_TSC) 527 || (cpu_is_omap15xx() && length < ep->maxpacket)) { 528 txdma_ctrl = UDC_TXN_EOT | length; 529 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S8, 530 length, 1, sync_mode, dma_trigger, 0); 531 } else { 532 length = min(length / ep->maxpacket, 533 (unsigned) UDC_TXN_TSC + 1); 534 txdma_ctrl = length; 535 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16, 536 ep->ep.maxpacket >> 1, length, sync_mode, 537 dma_trigger, 0); 538 length *= ep->maxpacket; 539 } 540 omap_set_dma_src_params(ep->lch, OMAP_DMA_PORT_EMIFF, 541 OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual, 542 0, 0); 543 544 omap_start_dma(ep->lch); 545 ep->dma_counter = omap_get_dma_src_pos(ep->lch); 546 w = omap_readw(UDC_DMA_IRQ_EN); 547 w |= UDC_TX_DONE_IE(ep->dma_channel); 548 omap_writew(w, UDC_DMA_IRQ_EN); 549 omap_writew(UDC_TXN_START | txdma_ctrl, UDC_TXDMA(ep->dma_channel)); 550 req->dma_bytes = length; 551} 552 553static void finish_in_dma(struct omap_ep *ep, struct omap_req *req, int status) 554{ 555 u16 w; 556 557 if (status == 0) { 558 req->req.actual += req->dma_bytes; 559 560 /* return if this request needs to send data or zlp */ 561 if (req->req.actual < req->req.length) 562 return; 563 if (req->req.zero 564 && req->dma_bytes != 0 565 && (req->req.actual % ep->maxpacket) == 0) 566 return; 567 } else 568 req->req.actual += dma_src_len(ep, req->req.dma 569 + req->req.actual); 570 571 /* tx completion */ 572 omap_stop_dma(ep->lch); 573 w = omap_readw(UDC_DMA_IRQ_EN); 574 w &= ~UDC_TX_DONE_IE(ep->dma_channel); 575 omap_writew(w, UDC_DMA_IRQ_EN); 576 done(ep, req, status); 577} 578 579static void next_out_dma(struct omap_ep *ep, struct omap_req *req) 580{ 581 unsigned packets = req->req.length - req->req.actual; 582 int dma_trigger = 0; 583 u16 w; 584 585 /* set up this DMA transfer, enable the fifo, start */ 586 packets /= ep->ep.maxpacket; 587 packets = min(packets, (unsigned)UDC_RXN_TC + 1); 588 req->dma_bytes = packets * ep->ep.maxpacket; 589 omap_set_dma_transfer_params(ep->lch, OMAP_DMA_DATA_TYPE_S16, 590 ep->ep.maxpacket >> 1, packets, 591 OMAP_DMA_SYNC_ELEMENT, 592 dma_trigger, 0); 593 omap_set_dma_dest_params(ep->lch, OMAP_DMA_PORT_EMIFF, 594 OMAP_DMA_AMODE_POST_INC, req->req.dma + req->req.actual, 595 0, 0); 596 ep->dma_counter = omap_get_dma_dst_pos(ep->lch); 597 598 omap_writew(UDC_RXN_STOP | (packets - 1), UDC_RXDMA(ep->dma_channel)); 599 w = omap_readw(UDC_DMA_IRQ_EN); 600 w |= UDC_RX_EOT_IE(ep->dma_channel); 601 omap_writew(w, UDC_DMA_IRQ_EN); 602 omap_writew(ep->bEndpointAddress & 0xf, UDC_EP_NUM); 603 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 604 605 omap_start_dma(ep->lch); 606} 607 608static void 609finish_out_dma(struct omap_ep *ep, struct omap_req *req, int status, int one) 610{ 611 u16 count, w; 612 613 if (status == 0) 614 ep->dma_counter = (u16) (req->req.dma + req->req.actual); 615 count = dma_dest_len(ep, req->req.dma + req->req.actual); 616 count += req->req.actual; 617 if (one) 618 count--; 619 if (count <= req->req.length) 620 req->req.actual = count; 621 622 if (count != req->dma_bytes || status) 623 omap_stop_dma(ep->lch); 624 625 /* if this wasn't short, request may need another transfer */ 626 else if (req->req.actual < req->req.length) 627 return; 628 629 /* rx completion */ 630 w = omap_readw(UDC_DMA_IRQ_EN); 631 w &= ~UDC_RX_EOT_IE(ep->dma_channel); 632 omap_writew(w, UDC_DMA_IRQ_EN); 633 done(ep, req, status); 634} 635 636static void dma_irq(struct omap_udc *udc, u16 irq_src) 637{ 638 u16 dman_stat = omap_readw(UDC_DMAN_STAT); 639 struct omap_ep *ep; 640 struct omap_req *req; 641 642 /* IN dma: tx to host */ 643 if (irq_src & UDC_TXN_DONE) { 644 ep = &udc->ep[16 + UDC_DMA_TX_SRC(dman_stat)]; 645 ep->irqs++; 646 /* can see TXN_DONE after dma abort */ 647 if (!list_empty(&ep->queue)) { 648 req = container_of(ep->queue.next, 649 struct omap_req, queue); 650 finish_in_dma(ep, req, 0); 651 } 652 omap_writew(UDC_TXN_DONE, UDC_IRQ_SRC); 653 654 if (!list_empty(&ep->queue)) { 655 req = container_of(ep->queue.next, 656 struct omap_req, queue); 657 next_in_dma(ep, req); 658 } 659 } 660 661 /* OUT dma: rx from host */ 662 if (irq_src & UDC_RXN_EOT) { 663 ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)]; 664 ep->irqs++; 665 /* can see RXN_EOT after dma abort */ 666 if (!list_empty(&ep->queue)) { 667 req = container_of(ep->queue.next, 668 struct omap_req, queue); 669 finish_out_dma(ep, req, 0, dman_stat & UDC_DMA_RX_SB); 670 } 671 omap_writew(UDC_RXN_EOT, UDC_IRQ_SRC); 672 673 if (!list_empty(&ep->queue)) { 674 req = container_of(ep->queue.next, 675 struct omap_req, queue); 676 next_out_dma(ep, req); 677 } 678 } 679 680 if (irq_src & UDC_RXN_CNT) { 681 ep = &udc->ep[UDC_DMA_RX_SRC(dman_stat)]; 682 ep->irqs++; 683 /* omap15xx does this unasked... */ 684 VDBG("%s, RX_CNT irq?\n", ep->ep.name); 685 omap_writew(UDC_RXN_CNT, UDC_IRQ_SRC); 686 } 687} 688 689static void dma_error(int lch, u16 ch_status, void *data) 690{ 691 struct omap_ep *ep = data; 692 693 /* if ch_status & OMAP_DMA_DROP_IRQ ... */ 694 /* if ch_status & OMAP1_DMA_TOUT_IRQ ... */ 695 ERR("%s dma error, lch %d status %02x\n", ep->ep.name, lch, ch_status); 696 697 /* complete current transfer ... */ 698} 699 700static void dma_channel_claim(struct omap_ep *ep, unsigned channel) 701{ 702 u16 reg; 703 int status, restart, is_in; 704 int dma_channel; 705 706 is_in = ep->bEndpointAddress & USB_DIR_IN; 707 if (is_in) 708 reg = omap_readw(UDC_TXDMA_CFG); 709 else 710 reg = omap_readw(UDC_RXDMA_CFG); 711 reg |= UDC_DMA_REQ; /* "pulse" activated */ 712 713 ep->dma_channel = 0; 714 ep->lch = -1; 715 if (channel == 0 || channel > 3) { 716 if ((reg & 0x0f00) == 0) 717 channel = 3; 718 else if ((reg & 0x00f0) == 0) 719 channel = 2; 720 else if ((reg & 0x000f) == 0) /* preferred for ISO */ 721 channel = 1; 722 else { 723 status = -EMLINK; 724 goto just_restart; 725 } 726 } 727 reg |= (0x0f & ep->bEndpointAddress) << (4 * (channel - 1)); 728 ep->dma_channel = channel; 729 730 if (is_in) { 731 dma_channel = OMAP_DMA_USB_W2FC_TX0 - 1 + channel; 732 status = omap_request_dma(dma_channel, 733 ep->ep.name, dma_error, ep, &ep->lch); 734 if (status == 0) { 735 omap_writew(reg, UDC_TXDMA_CFG); 736 /* EMIFF or SDRC */ 737 omap_set_dma_src_burst_mode(ep->lch, 738 OMAP_DMA_DATA_BURST_4); 739 omap_set_dma_src_data_pack(ep->lch, 1); 740 /* TIPB */ 741 omap_set_dma_dest_params(ep->lch, 742 OMAP_DMA_PORT_TIPB, 743 OMAP_DMA_AMODE_CONSTANT, 744 UDC_DATA_DMA, 745 0, 0); 746 } 747 } else { 748 dma_channel = OMAP_DMA_USB_W2FC_RX0 - 1 + channel; 749 status = omap_request_dma(dma_channel, 750 ep->ep.name, dma_error, ep, &ep->lch); 751 if (status == 0) { 752 omap_writew(reg, UDC_RXDMA_CFG); 753 /* TIPB */ 754 omap_set_dma_src_params(ep->lch, 755 OMAP_DMA_PORT_TIPB, 756 OMAP_DMA_AMODE_CONSTANT, 757 UDC_DATA_DMA, 758 0, 0); 759 /* EMIFF or SDRC */ 760 omap_set_dma_dest_burst_mode(ep->lch, 761 OMAP_DMA_DATA_BURST_4); 762 omap_set_dma_dest_data_pack(ep->lch, 1); 763 } 764 } 765 if (status) 766 ep->dma_channel = 0; 767 else { 768 ep->has_dma = 1; 769 omap_disable_dma_irq(ep->lch, OMAP_DMA_BLOCK_IRQ); 770 771 /* channel type P: hw synch (fifo) */ 772 if (!cpu_is_omap15xx()) 773 omap_set_dma_channel_mode(ep->lch, OMAP_DMA_LCH_P); 774 } 775 776just_restart: 777 /* restart any queue, even if the claim failed */ 778 restart = !ep->stopped && !list_empty(&ep->queue); 779 780 if (status) 781 DBG("%s no dma channel: %d%s\n", ep->ep.name, status, 782 restart ? " (restart)" : ""); 783 else 784 DBG("%s claimed %cxdma%d lch %d%s\n", ep->ep.name, 785 is_in ? 't' : 'r', 786 ep->dma_channel - 1, ep->lch, 787 restart ? " (restart)" : ""); 788 789 if (restart) { 790 struct omap_req *req; 791 req = container_of(ep->queue.next, struct omap_req, queue); 792 if (ep->has_dma) 793 (is_in ? next_in_dma : next_out_dma)(ep, req); 794 else { 795 use_ep(ep, UDC_EP_SEL); 796 (is_in ? write_fifo : read_fifo)(ep, req); 797 deselect_ep(); 798 if (!is_in) { 799 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 800 ep->ackwait = 1 + ep->double_buf; 801 } 802 /* IN: 6 wait states before it'll tx */ 803 } 804 } 805} 806 807static void dma_channel_release(struct omap_ep *ep) 808{ 809 int shift = 4 * (ep->dma_channel - 1); 810 u16 mask = 0x0f << shift; 811 struct omap_req *req; 812 int active; 813 814 /* abort any active usb transfer request */ 815 if (!list_empty(&ep->queue)) 816 req = container_of(ep->queue.next, struct omap_req, queue); 817 else 818 req = NULL; 819 820 active = omap_get_dma_active_status(ep->lch); 821 822 DBG("%s release %s %cxdma%d %p\n", ep->ep.name, 823 active ? "active" : "idle", 824 (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r', 825 ep->dma_channel - 1, req); 826 827 /* NOTE: re-setting RX_REQ/TX_REQ because of a chip bug (before 828 * OMAP 1710 ES2.0) where reading the DMA_CFG can clear them. 829 */ 830 831 /* wait till current packet DMA finishes, and fifo empties */ 832 if (ep->bEndpointAddress & USB_DIR_IN) { 833 omap_writew((omap_readw(UDC_TXDMA_CFG) & ~mask) | UDC_DMA_REQ, 834 UDC_TXDMA_CFG); 835 836 if (req) { 837 finish_in_dma(ep, req, -ECONNRESET); 838 839 /* clear FIFO; hosts probably won't empty it */ 840 use_ep(ep, UDC_EP_SEL); 841 omap_writew(UDC_CLR_EP, UDC_CTRL); 842 deselect_ep(); 843 } 844 while (omap_readw(UDC_TXDMA_CFG) & mask) 845 udelay(10); 846 } else { 847 omap_writew((omap_readw(UDC_RXDMA_CFG) & ~mask) | UDC_DMA_REQ, 848 UDC_RXDMA_CFG); 849 850 /* dma empties the fifo */ 851 while (omap_readw(UDC_RXDMA_CFG) & mask) 852 udelay(10); 853 if (req) 854 finish_out_dma(ep, req, -ECONNRESET, 0); 855 } 856 omap_free_dma(ep->lch); 857 ep->dma_channel = 0; 858 ep->lch = -1; 859 /* has_dma still set, till endpoint is fully quiesced */ 860} 861 862 863/*-------------------------------------------------------------------------*/ 864 865static int 866omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) 867{ 868 struct omap_ep *ep = container_of(_ep, struct omap_ep, ep); 869 struct omap_req *req = container_of(_req, struct omap_req, req); 870 struct omap_udc *udc; 871 unsigned long flags; 872 int is_iso = 0; 873 874 /* catch various bogus parameters */ 875 if (!_req || !req->req.complete || !req->req.buf 876 || !list_empty(&req->queue)) { 877 DBG("%s, bad params\n", __func__); 878 return -EINVAL; 879 } 880 if (!_ep || (!ep->ep.desc && ep->bEndpointAddress)) { 881 DBG("%s, bad ep\n", __func__); 882 return -EINVAL; 883 } 884 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) { 885 if (req->req.length > ep->ep.maxpacket) 886 return -EMSGSIZE; 887 is_iso = 1; 888 } 889 890 /* this isn't bogus, but OMAP DMA isn't the only hardware to 891 * have a hard time with partial packet reads... reject it. 892 */ 893 if (use_dma 894 && ep->has_dma 895 && ep->bEndpointAddress != 0 896 && (ep->bEndpointAddress & USB_DIR_IN) == 0 897 && (req->req.length % ep->ep.maxpacket) != 0) { 898 DBG("%s, no partial packet OUT reads\n", __func__); 899 return -EMSGSIZE; 900 } 901 902 udc = ep->udc; 903 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) 904 return -ESHUTDOWN; 905 906 if (use_dma && ep->has_dma) 907 usb_gadget_map_request(&udc->gadget, &req->req, 908 (ep->bEndpointAddress & USB_DIR_IN)); 909 910 VDBG("%s queue req %p, len %d buf %p\n", 911 ep->ep.name, _req, _req->length, _req->buf); 912 913 spin_lock_irqsave(&udc->lock, flags); 914 915 req->req.status = -EINPROGRESS; 916 req->req.actual = 0; 917 918 /* maybe kickstart non-iso i/o queues */ 919 if (is_iso) { 920 u16 w; 921 922 w = omap_readw(UDC_IRQ_EN); 923 w |= UDC_SOF_IE; 924 omap_writew(w, UDC_IRQ_EN); 925 } else if (list_empty(&ep->queue) && !ep->stopped && !ep->ackwait) { 926 int is_in; 927 928 if (ep->bEndpointAddress == 0) { 929 if (!udc->ep0_pending || !list_empty(&ep->queue)) { 930 spin_unlock_irqrestore(&udc->lock, flags); 931 return -EL2HLT; 932 } 933 934 /* empty DATA stage? */ 935 is_in = udc->ep0_in; 936 if (!req->req.length) { 937 938 /* chip became CONFIGURED or ADDRESSED 939 * earlier; drivers may already have queued 940 * requests to non-control endpoints 941 */ 942 if (udc->ep0_set_config) { 943 u16 irq_en = omap_readw(UDC_IRQ_EN); 944 945 irq_en |= UDC_DS_CHG_IE | UDC_EP0_IE; 946 if (!udc->ep0_reset_config) 947 irq_en |= UDC_EPN_RX_IE 948 | UDC_EPN_TX_IE; 949 omap_writew(irq_en, UDC_IRQ_EN); 950 } 951 952 /* STATUS for zero length DATA stages is 953 * always an IN ... even for IN transfers, 954 * a weird case which seem to stall OMAP. 955 */ 956 omap_writew(UDC_EP_SEL | UDC_EP_DIR, 957 UDC_EP_NUM); 958 omap_writew(UDC_CLR_EP, UDC_CTRL); 959 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 960 omap_writew(UDC_EP_DIR, UDC_EP_NUM); 961 962 /* cleanup */ 963 udc->ep0_pending = 0; 964 done(ep, req, 0); 965 req = NULL; 966 967 /* non-empty DATA stage */ 968 } else if (is_in) { 969 omap_writew(UDC_EP_SEL | UDC_EP_DIR, 970 UDC_EP_NUM); 971 } else { 972 if (udc->ep0_setup) 973 goto irq_wait; 974 omap_writew(UDC_EP_SEL, UDC_EP_NUM); 975 } 976 } else { 977 is_in = ep->bEndpointAddress & USB_DIR_IN; 978 if (!ep->has_dma) 979 use_ep(ep, UDC_EP_SEL); 980 /* if ISO: SOF IRQs must be enabled/disabled! */ 981 } 982 983 if (ep->has_dma) 984 (is_in ? next_in_dma : next_out_dma)(ep, req); 985 else if (req) { 986 if ((is_in ? write_fifo : read_fifo)(ep, req) == 1) 987 req = NULL; 988 deselect_ep(); 989 if (!is_in) { 990 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 991 ep->ackwait = 1 + ep->double_buf; 992 } 993 /* IN: 6 wait states before it'll tx */ 994 } 995 } 996 997irq_wait: 998 /* irq handler advances the queue */ 999 if (req != NULL) 1000 list_add_tail(&req->queue, &ep->queue); 1001 spin_unlock_irqrestore(&udc->lock, flags); 1002 1003 return 0; 1004} 1005 1006static int omap_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) 1007{ 1008 struct omap_ep *ep = container_of(_ep, struct omap_ep, ep); 1009 struct omap_req *req = NULL, *iter; 1010 unsigned long flags; 1011 1012 if (!_ep || !_req) 1013 return -EINVAL; 1014 1015 spin_lock_irqsave(&ep->udc->lock, flags); 1016 1017 /* make sure it's actually queued on this endpoint */ 1018 list_for_each_entry(iter, &ep->queue, queue) { 1019 if (&iter->req != _req) 1020 continue; 1021 req = iter; 1022 break; 1023 } 1024 if (!req) { 1025 spin_unlock_irqrestore(&ep->udc->lock, flags); 1026 return -EINVAL; 1027 } 1028 1029 if (use_dma && ep->dma_channel && ep->queue.next == &req->queue) { 1030 int channel = ep->dma_channel; 1031 1032 /* releasing the channel cancels the request, 1033 * reclaiming the channel restarts the queue 1034 */ 1035 dma_channel_release(ep); 1036 dma_channel_claim(ep, channel); 1037 } else 1038 done(ep, req, -ECONNRESET); 1039 spin_unlock_irqrestore(&ep->udc->lock, flags); 1040 return 0; 1041} 1042 1043/*-------------------------------------------------------------------------*/ 1044 1045static int omap_ep_set_halt(struct usb_ep *_ep, int value) 1046{ 1047 struct omap_ep *ep = container_of(_ep, struct omap_ep, ep); 1048 unsigned long flags; 1049 int status = -EOPNOTSUPP; 1050 1051 spin_lock_irqsave(&ep->udc->lock, flags); 1052 1053 /* just use protocol stalls for ep0; real halts are annoying */ 1054 if (ep->bEndpointAddress == 0) { 1055 if (!ep->udc->ep0_pending) 1056 status = -EINVAL; 1057 else if (value) { 1058 if (ep->udc->ep0_set_config) { 1059 WARNING("error changing config?\n"); 1060 omap_writew(UDC_CLR_CFG, UDC_SYSCON2); 1061 } 1062 omap_writew(UDC_STALL_CMD, UDC_SYSCON2); 1063 ep->udc->ep0_pending = 0; 1064 status = 0; 1065 } else /* NOP */ 1066 status = 0; 1067 1068 /* otherwise, all active non-ISO endpoints can halt */ 1069 } else if (ep->bmAttributes != USB_ENDPOINT_XFER_ISOC && ep->ep.desc) { 1070 1071 /* IN endpoints must already be idle */ 1072 if ((ep->bEndpointAddress & USB_DIR_IN) 1073 && !list_empty(&ep->queue)) { 1074 status = -EAGAIN; 1075 goto done; 1076 } 1077 1078 if (value) { 1079 int channel; 1080 1081 if (use_dma && ep->dma_channel 1082 && !list_empty(&ep->queue)) { 1083 channel = ep->dma_channel; 1084 dma_channel_release(ep); 1085 } else 1086 channel = 0; 1087 1088 use_ep(ep, UDC_EP_SEL); 1089 if (omap_readw(UDC_STAT_FLG) & UDC_NON_ISO_FIFO_EMPTY) { 1090 omap_writew(UDC_SET_HALT, UDC_CTRL); 1091 status = 0; 1092 } else 1093 status = -EAGAIN; 1094 deselect_ep(); 1095 1096 if (channel) 1097 dma_channel_claim(ep, channel); 1098 } else { 1099 use_ep(ep, 0); 1100 omap_writew(ep->udc->clr_halt, UDC_CTRL); 1101 ep->ackwait = 0; 1102 if (!(ep->bEndpointAddress & USB_DIR_IN)) { 1103 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 1104 ep->ackwait = 1 + ep->double_buf; 1105 } 1106 } 1107 } 1108done: 1109 VDBG("%s %s halt stat %d\n", ep->ep.name, 1110 value ? "set" : "clear", status); 1111 1112 spin_unlock_irqrestore(&ep->udc->lock, flags); 1113 return status; 1114} 1115 1116static const struct usb_ep_ops omap_ep_ops = { 1117 .enable = omap_ep_enable, 1118 .disable = omap_ep_disable, 1119 1120 .alloc_request = omap_alloc_request, 1121 .free_request = omap_free_request, 1122 1123 .queue = omap_ep_queue, 1124 .dequeue = omap_ep_dequeue, 1125 1126 .set_halt = omap_ep_set_halt, 1127 /* fifo_status ... report bytes in fifo */ 1128 /* fifo_flush ... flush fifo */ 1129}; 1130 1131/*-------------------------------------------------------------------------*/ 1132 1133static int omap_get_frame(struct usb_gadget *gadget) 1134{ 1135 u16 sof = omap_readw(UDC_SOF); 1136 return (sof & UDC_TS_OK) ? (sof & UDC_TS) : -EL2NSYNC; 1137} 1138 1139static int omap_wakeup(struct usb_gadget *gadget) 1140{ 1141 struct omap_udc *udc; 1142 unsigned long flags; 1143 int retval = -EHOSTUNREACH; 1144 1145 udc = container_of(gadget, struct omap_udc, gadget); 1146 1147 spin_lock_irqsave(&udc->lock, flags); 1148 if (udc->devstat & UDC_SUS) { 1149 /* NOTE: OTG spec erratum says that OTG devices may 1150 * issue wakeups without host enable. 1151 */ 1152 if (udc->devstat & (UDC_B_HNP_ENABLE|UDC_R_WK_OK)) { 1153 DBG("remote wakeup...\n"); 1154 omap_writew(UDC_RMT_WKP, UDC_SYSCON2); 1155 retval = 0; 1156 } 1157 1158 /* NOTE: non-OTG systems may use SRP TOO... */ 1159 } else if (!(udc->devstat & UDC_ATT)) { 1160 if (!IS_ERR_OR_NULL(udc->transceiver)) 1161 retval = otg_start_srp(udc->transceiver->otg); 1162 } 1163 spin_unlock_irqrestore(&udc->lock, flags); 1164 1165 return retval; 1166} 1167 1168static int 1169omap_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered) 1170{ 1171 struct omap_udc *udc; 1172 unsigned long flags; 1173 u16 syscon1; 1174 1175 gadget->is_selfpowered = (is_selfpowered != 0); 1176 udc = container_of(gadget, struct omap_udc, gadget); 1177 spin_lock_irqsave(&udc->lock, flags); 1178 syscon1 = omap_readw(UDC_SYSCON1); 1179 if (is_selfpowered) 1180 syscon1 |= UDC_SELF_PWR; 1181 else 1182 syscon1 &= ~UDC_SELF_PWR; 1183 omap_writew(syscon1, UDC_SYSCON1); 1184 spin_unlock_irqrestore(&udc->lock, flags); 1185 1186 return 0; 1187} 1188 1189static int can_pullup(struct omap_udc *udc) 1190{ 1191 return udc->driver && udc->softconnect && udc->vbus_active; 1192} 1193 1194static void pullup_enable(struct omap_udc *udc) 1195{ 1196 u16 w; 1197 1198 w = omap_readw(UDC_SYSCON1); 1199 w |= UDC_PULLUP_EN; 1200 omap_writew(w, UDC_SYSCON1); 1201 if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) { 1202 u32 l; 1203 1204 l = omap_readl(OTG_CTRL); 1205 l |= OTG_BSESSVLD; 1206 omap_writel(l, OTG_CTRL); 1207 } 1208 omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN); 1209} 1210 1211static void pullup_disable(struct omap_udc *udc) 1212{ 1213 u16 w; 1214 1215 if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) { 1216 u32 l; 1217 1218 l = omap_readl(OTG_CTRL); 1219 l &= ~OTG_BSESSVLD; 1220 omap_writel(l, OTG_CTRL); 1221 } 1222 omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN); 1223 w = omap_readw(UDC_SYSCON1); 1224 w &= ~UDC_PULLUP_EN; 1225 omap_writew(w, UDC_SYSCON1); 1226} 1227 1228static struct omap_udc *udc; 1229 1230static void omap_udc_enable_clock(int enable) 1231{ 1232 if (udc == NULL || udc->dc_clk == NULL || udc->hhc_clk == NULL) 1233 return; 1234 1235 if (enable) { 1236 clk_enable(udc->dc_clk); 1237 clk_enable(udc->hhc_clk); 1238 udelay(100); 1239 } else { 1240 clk_disable(udc->hhc_clk); 1241 clk_disable(udc->dc_clk); 1242 } 1243} 1244 1245/* 1246 * Called by whatever detects VBUS sessions: external transceiver 1247 * driver, or maybe GPIO0 VBUS IRQ. May request 48 MHz clock. 1248 */ 1249static int omap_vbus_session(struct usb_gadget *gadget, int is_active) 1250{ 1251 struct omap_udc *udc; 1252 unsigned long flags; 1253 u32 l; 1254 1255 udc = container_of(gadget, struct omap_udc, gadget); 1256 spin_lock_irqsave(&udc->lock, flags); 1257 VDBG("VBUS %s\n", is_active ? "on" : "off"); 1258 udc->vbus_active = (is_active != 0); 1259 if (cpu_is_omap15xx()) { 1260 /* "software" detect, ignored if !VBUS_MODE_1510 */ 1261 l = omap_readl(FUNC_MUX_CTRL_0); 1262 if (is_active) 1263 l |= VBUS_CTRL_1510; 1264 else 1265 l &= ~VBUS_CTRL_1510; 1266 omap_writel(l, FUNC_MUX_CTRL_0); 1267 } 1268 if (udc->dc_clk != NULL && is_active) { 1269 if (!udc->clk_requested) { 1270 omap_udc_enable_clock(1); 1271 udc->clk_requested = 1; 1272 } 1273 } 1274 if (can_pullup(udc)) 1275 pullup_enable(udc); 1276 else 1277 pullup_disable(udc); 1278 if (udc->dc_clk != NULL && !is_active) { 1279 if (udc->clk_requested) { 1280 omap_udc_enable_clock(0); 1281 udc->clk_requested = 0; 1282 } 1283 } 1284 spin_unlock_irqrestore(&udc->lock, flags); 1285 return 0; 1286} 1287 1288static int omap_vbus_draw(struct usb_gadget *gadget, unsigned mA) 1289{ 1290 struct omap_udc *udc; 1291 1292 udc = container_of(gadget, struct omap_udc, gadget); 1293 if (!IS_ERR_OR_NULL(udc->transceiver)) 1294 return usb_phy_set_power(udc->transceiver, mA); 1295 return -EOPNOTSUPP; 1296} 1297 1298static int omap_pullup(struct usb_gadget *gadget, int is_on) 1299{ 1300 struct omap_udc *udc; 1301 unsigned long flags; 1302 1303 udc = container_of(gadget, struct omap_udc, gadget); 1304 spin_lock_irqsave(&udc->lock, flags); 1305 udc->softconnect = (is_on != 0); 1306 if (can_pullup(udc)) 1307 pullup_enable(udc); 1308 else 1309 pullup_disable(udc); 1310 spin_unlock_irqrestore(&udc->lock, flags); 1311 return 0; 1312} 1313 1314static int omap_udc_start(struct usb_gadget *g, 1315 struct usb_gadget_driver *driver); 1316static int omap_udc_stop(struct usb_gadget *g); 1317 1318static const struct usb_gadget_ops omap_gadget_ops = { 1319 .get_frame = omap_get_frame, 1320 .wakeup = omap_wakeup, 1321 .set_selfpowered = omap_set_selfpowered, 1322 .vbus_session = omap_vbus_session, 1323 .vbus_draw = omap_vbus_draw, 1324 .pullup = omap_pullup, 1325 .udc_start = omap_udc_start, 1326 .udc_stop = omap_udc_stop, 1327}; 1328 1329/*-------------------------------------------------------------------------*/ 1330 1331/* dequeue ALL requests; caller holds udc->lock */ 1332static void nuke(struct omap_ep *ep, int status) 1333{ 1334 struct omap_req *req; 1335 1336 ep->stopped = 1; 1337 1338 if (use_dma && ep->dma_channel) 1339 dma_channel_release(ep); 1340 1341 use_ep(ep, 0); 1342 omap_writew(UDC_CLR_EP, UDC_CTRL); 1343 if (ep->bEndpointAddress && ep->bmAttributes != USB_ENDPOINT_XFER_ISOC) 1344 omap_writew(UDC_SET_HALT, UDC_CTRL); 1345 1346 while (!list_empty(&ep->queue)) { 1347 req = list_entry(ep->queue.next, struct omap_req, queue); 1348 done(ep, req, status); 1349 } 1350} 1351 1352/* caller holds udc->lock */ 1353static void udc_quiesce(struct omap_udc *udc) 1354{ 1355 struct omap_ep *ep; 1356 1357 udc->gadget.speed = USB_SPEED_UNKNOWN; 1358 nuke(&udc->ep[0], -ESHUTDOWN); 1359 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) 1360 nuke(ep, -ESHUTDOWN); 1361} 1362 1363/*-------------------------------------------------------------------------*/ 1364 1365static void update_otg(struct omap_udc *udc) 1366{ 1367 u16 devstat; 1368 1369 if (!gadget_is_otg(&udc->gadget)) 1370 return; 1371 1372 if (omap_readl(OTG_CTRL) & OTG_ID) 1373 devstat = omap_readw(UDC_DEVSTAT); 1374 else 1375 devstat = 0; 1376 1377 udc->gadget.b_hnp_enable = !!(devstat & UDC_B_HNP_ENABLE); 1378 udc->gadget.a_hnp_support = !!(devstat & UDC_A_HNP_SUPPORT); 1379 udc->gadget.a_alt_hnp_support = !!(devstat & UDC_A_ALT_HNP_SUPPORT); 1380 1381 /* Enable HNP early, avoiding races on suspend irq path. 1382 * ASSUMES OTG state machine B_BUS_REQ input is true. 1383 */ 1384 if (udc->gadget.b_hnp_enable) { 1385 u32 l; 1386 1387 l = omap_readl(OTG_CTRL); 1388 l |= OTG_B_HNPEN | OTG_B_BUSREQ; 1389 l &= ~OTG_PULLUP; 1390 omap_writel(l, OTG_CTRL); 1391 } 1392} 1393 1394static void ep0_irq(struct omap_udc *udc, u16 irq_src) 1395{ 1396 struct omap_ep *ep0 = &udc->ep[0]; 1397 struct omap_req *req = NULL; 1398 1399 ep0->irqs++; 1400 1401 /* Clear any pending requests and then scrub any rx/tx state 1402 * before starting to handle the SETUP request. 1403 */ 1404 if (irq_src & UDC_SETUP) { 1405 u16 ack = irq_src & (UDC_EP0_TX|UDC_EP0_RX); 1406 1407 nuke(ep0, 0); 1408 if (ack) { 1409 omap_writew(ack, UDC_IRQ_SRC); 1410 irq_src = UDC_SETUP; 1411 } 1412 } 1413 1414 /* IN/OUT packets mean we're in the DATA or STATUS stage. 1415 * This driver uses only uses protocol stalls (ep0 never halts), 1416 * and if we got this far the gadget driver already had a 1417 * chance to stall. Tries to be forgiving of host oddities. 1418 * 1419 * NOTE: the last chance gadget drivers have to stall control 1420 * requests is during their request completion callback. 1421 */ 1422 if (!list_empty(&ep0->queue)) 1423 req = container_of(ep0->queue.next, struct omap_req, queue); 1424 1425 /* IN == TX to host */ 1426 if (irq_src & UDC_EP0_TX) { 1427 int stat; 1428 1429 omap_writew(UDC_EP0_TX, UDC_IRQ_SRC); 1430 omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM); 1431 stat = omap_readw(UDC_STAT_FLG); 1432 if (stat & UDC_ACK) { 1433 if (udc->ep0_in) { 1434 /* write next IN packet from response, 1435 * or set up the status stage. 1436 */ 1437 if (req) 1438 stat = write_fifo(ep0, req); 1439 omap_writew(UDC_EP_DIR, UDC_EP_NUM); 1440 if (!req && udc->ep0_pending) { 1441 omap_writew(UDC_EP_SEL, UDC_EP_NUM); 1442 omap_writew(UDC_CLR_EP, UDC_CTRL); 1443 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 1444 omap_writew(0, UDC_EP_NUM); 1445 udc->ep0_pending = 0; 1446 } /* else: 6 wait states before it'll tx */ 1447 } else { 1448 /* ack status stage of OUT transfer */ 1449 omap_writew(UDC_EP_DIR, UDC_EP_NUM); 1450 if (req) 1451 done(ep0, req, 0); 1452 } 1453 req = NULL; 1454 } else if (stat & UDC_STALL) { 1455 omap_writew(UDC_CLR_HALT, UDC_CTRL); 1456 omap_writew(UDC_EP_DIR, UDC_EP_NUM); 1457 } else { 1458 omap_writew(UDC_EP_DIR, UDC_EP_NUM); 1459 } 1460 } 1461 1462 /* OUT == RX from host */ 1463 if (irq_src & UDC_EP0_RX) { 1464 int stat; 1465 1466 omap_writew(UDC_EP0_RX, UDC_IRQ_SRC); 1467 omap_writew(UDC_EP_SEL, UDC_EP_NUM); 1468 stat = omap_readw(UDC_STAT_FLG); 1469 if (stat & UDC_ACK) { 1470 if (!udc->ep0_in) { 1471 stat = 0; 1472 /* read next OUT packet of request, maybe 1473 * reactivating the fifo; stall on errors. 1474 */ 1475 stat = read_fifo(ep0, req); 1476 if (!req || stat < 0) { 1477 omap_writew(UDC_STALL_CMD, UDC_SYSCON2); 1478 udc->ep0_pending = 0; 1479 stat = 0; 1480 } else if (stat == 0) 1481 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 1482 omap_writew(0, UDC_EP_NUM); 1483 1484 /* activate status stage */ 1485 if (stat == 1) { 1486 done(ep0, req, 0); 1487 /* that may have STALLed ep0... */ 1488 omap_writew(UDC_EP_SEL | UDC_EP_DIR, 1489 UDC_EP_NUM); 1490 omap_writew(UDC_CLR_EP, UDC_CTRL); 1491 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 1492 omap_writew(UDC_EP_DIR, UDC_EP_NUM); 1493 udc->ep0_pending = 0; 1494 } 1495 } else { 1496 /* ack status stage of IN transfer */ 1497 omap_writew(0, UDC_EP_NUM); 1498 if (req) 1499 done(ep0, req, 0); 1500 } 1501 } else if (stat & UDC_STALL) { 1502 omap_writew(UDC_CLR_HALT, UDC_CTRL); 1503 omap_writew(0, UDC_EP_NUM); 1504 } else { 1505 omap_writew(0, UDC_EP_NUM); 1506 } 1507 } 1508 1509 /* SETUP starts all control transfers */ 1510 if (irq_src & UDC_SETUP) { 1511 union u { 1512 u16 word[4]; 1513 struct usb_ctrlrequest r; 1514 } u; 1515 int status = -EINVAL; 1516 struct omap_ep *ep; 1517 1518 /* read the (latest) SETUP message */ 1519 do { 1520 omap_writew(UDC_SETUP_SEL, UDC_EP_NUM); 1521 /* two bytes at a time */ 1522 u.word[0] = omap_readw(UDC_DATA); 1523 u.word[1] = omap_readw(UDC_DATA); 1524 u.word[2] = omap_readw(UDC_DATA); 1525 u.word[3] = omap_readw(UDC_DATA); 1526 omap_writew(0, UDC_EP_NUM); 1527 } while (omap_readw(UDC_IRQ_SRC) & UDC_SETUP); 1528 1529#define w_value le16_to_cpu(u.r.wValue) 1530#define w_index le16_to_cpu(u.r.wIndex) 1531#define w_length le16_to_cpu(u.r.wLength) 1532 1533 /* Delegate almost all control requests to the gadget driver, 1534 * except for a handful of ch9 status/feature requests that 1535 * hardware doesn't autodecode _and_ the gadget API hides. 1536 */ 1537 udc->ep0_in = (u.r.bRequestType & USB_DIR_IN) != 0; 1538 udc->ep0_set_config = 0; 1539 udc->ep0_pending = 1; 1540 ep0->stopped = 0; 1541 ep0->ackwait = 0; 1542 switch (u.r.bRequest) { 1543 case USB_REQ_SET_CONFIGURATION: 1544 /* udc needs to know when ep != 0 is valid */ 1545 if (u.r.bRequestType != USB_RECIP_DEVICE) 1546 goto delegate; 1547 if (w_length != 0) 1548 goto do_stall; 1549 udc->ep0_set_config = 1; 1550 udc->ep0_reset_config = (w_value == 0); 1551 VDBG("set config %d\n", w_value); 1552 1553 /* update udc NOW since gadget driver may start 1554 * queueing requests immediately; clear config 1555 * later if it fails the request. 1556 */ 1557 if (udc->ep0_reset_config) 1558 omap_writew(UDC_CLR_CFG, UDC_SYSCON2); 1559 else 1560 omap_writew(UDC_DEV_CFG, UDC_SYSCON2); 1561 update_otg(udc); 1562 goto delegate; 1563 case USB_REQ_CLEAR_FEATURE: 1564 /* clear endpoint halt */ 1565 if (u.r.bRequestType != USB_RECIP_ENDPOINT) 1566 goto delegate; 1567 if (w_value != USB_ENDPOINT_HALT 1568 || w_length != 0) 1569 goto do_stall; 1570 ep = &udc->ep[w_index & 0xf]; 1571 if (ep != ep0) { 1572 if (w_index & USB_DIR_IN) 1573 ep += 16; 1574 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC 1575 || !ep->ep.desc) 1576 goto do_stall; 1577 use_ep(ep, 0); 1578 omap_writew(udc->clr_halt, UDC_CTRL); 1579 ep->ackwait = 0; 1580 if (!(ep->bEndpointAddress & USB_DIR_IN)) { 1581 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 1582 ep->ackwait = 1 + ep->double_buf; 1583 } 1584 /* NOTE: assumes the host behaves sanely, 1585 * only clearing real halts. Else we may 1586 * need to kill pending transfers and then 1587 * restart the queue... very messy for DMA! 1588 */ 1589 } 1590 VDBG("%s halt cleared by host\n", ep->name); 1591 goto ep0out_status_stage; 1592 case USB_REQ_SET_FEATURE: 1593 /* set endpoint halt */ 1594 if (u.r.bRequestType != USB_RECIP_ENDPOINT) 1595 goto delegate; 1596 if (w_value != USB_ENDPOINT_HALT 1597 || w_length != 0) 1598 goto do_stall; 1599 ep = &udc->ep[w_index & 0xf]; 1600 if (w_index & USB_DIR_IN) 1601 ep += 16; 1602 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC 1603 || ep == ep0 || !ep->ep.desc) 1604 goto do_stall; 1605 if (use_dma && ep->has_dma) { 1606 /* this has rude side-effects (aborts) and 1607 * can't really work if DMA-IN is active 1608 */ 1609 DBG("%s host set_halt, NYET\n", ep->name); 1610 goto do_stall; 1611 } 1612 use_ep(ep, 0); 1613 /* can't halt if fifo isn't empty... */ 1614 omap_writew(UDC_CLR_EP, UDC_CTRL); 1615 omap_writew(UDC_SET_HALT, UDC_CTRL); 1616 VDBG("%s halted by host\n", ep->name); 1617ep0out_status_stage: 1618 status = 0; 1619 omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM); 1620 omap_writew(UDC_CLR_EP, UDC_CTRL); 1621 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 1622 omap_writew(UDC_EP_DIR, UDC_EP_NUM); 1623 udc->ep0_pending = 0; 1624 break; 1625 case USB_REQ_GET_STATUS: 1626 /* USB_ENDPOINT_HALT status? */ 1627 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT)) 1628 goto intf_status; 1629 1630 /* ep0 never stalls */ 1631 if (!(w_index & 0xf)) 1632 goto zero_status; 1633 1634 /* only active endpoints count */ 1635 ep = &udc->ep[w_index & 0xf]; 1636 if (w_index & USB_DIR_IN) 1637 ep += 16; 1638 if (!ep->ep.desc) 1639 goto do_stall; 1640 1641 /* iso never stalls */ 1642 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) 1643 goto zero_status; 1644 1645 /* FIXME don't assume non-halted endpoints!! */ 1646 ERR("%s status, can't report\n", ep->ep.name); 1647 goto do_stall; 1648 1649intf_status: 1650 /* return interface status. if we were pedantic, 1651 * we'd detect non-existent interfaces, and stall. 1652 */ 1653 if (u.r.bRequestType 1654 != (USB_DIR_IN|USB_RECIP_INTERFACE)) 1655 goto delegate; 1656 1657zero_status: 1658 /* return two zero bytes */ 1659 omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM); 1660 omap_writew(0, UDC_DATA); 1661 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 1662 omap_writew(UDC_EP_DIR, UDC_EP_NUM); 1663 status = 0; 1664 VDBG("GET_STATUS, interface %d\n", w_index); 1665 /* next, status stage */ 1666 break; 1667 default: 1668delegate: 1669 /* activate the ep0out fifo right away */ 1670 if (!udc->ep0_in && w_length) { 1671 omap_writew(0, UDC_EP_NUM); 1672 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 1673 } 1674 1675 /* gadget drivers see class/vendor specific requests, 1676 * {SET,GET}_{INTERFACE,DESCRIPTOR,CONFIGURATION}, 1677 * and more 1678 */ 1679 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n", 1680 u.r.bRequestType, u.r.bRequest, 1681 w_value, w_index, w_length); 1682 1683#undef w_value 1684#undef w_index 1685#undef w_length 1686 1687 /* The gadget driver may return an error here, 1688 * causing an immediate protocol stall. 1689 * 1690 * Else it must issue a response, either queueing a 1691 * response buffer for the DATA stage, or halting ep0 1692 * (causing a protocol stall, not a real halt). A 1693 * zero length buffer means no DATA stage. 1694 * 1695 * It's fine to issue that response after the setup() 1696 * call returns, and this IRQ was handled. 1697 */ 1698 udc->ep0_setup = 1; 1699 spin_unlock(&udc->lock); 1700 status = udc->driver->setup(&udc->gadget, &u.r); 1701 spin_lock(&udc->lock); 1702 udc->ep0_setup = 0; 1703 } 1704 1705 if (status < 0) { 1706do_stall: 1707 VDBG("req %02x.%02x protocol STALL; stat %d\n", 1708 u.r.bRequestType, u.r.bRequest, status); 1709 if (udc->ep0_set_config) { 1710 if (udc->ep0_reset_config) 1711 WARNING("error resetting config?\n"); 1712 else 1713 omap_writew(UDC_CLR_CFG, UDC_SYSCON2); 1714 } 1715 omap_writew(UDC_STALL_CMD, UDC_SYSCON2); 1716 udc->ep0_pending = 0; 1717 } 1718 } 1719} 1720 1721/*-------------------------------------------------------------------------*/ 1722 1723#define OTG_FLAGS (UDC_B_HNP_ENABLE|UDC_A_HNP_SUPPORT|UDC_A_ALT_HNP_SUPPORT) 1724 1725static void devstate_irq(struct omap_udc *udc, u16 irq_src) 1726{ 1727 u16 devstat, change; 1728 1729 devstat = omap_readw(UDC_DEVSTAT); 1730 change = devstat ^ udc->devstat; 1731 udc->devstat = devstat; 1732 1733 if (change & (UDC_USB_RESET|UDC_ATT)) { 1734 udc_quiesce(udc); 1735 1736 if (change & UDC_ATT) { 1737 /* driver for any external transceiver will 1738 * have called omap_vbus_session() already 1739 */ 1740 if (devstat & UDC_ATT) { 1741 udc->gadget.speed = USB_SPEED_FULL; 1742 VDBG("connect\n"); 1743 if (IS_ERR_OR_NULL(udc->transceiver)) 1744 pullup_enable(udc); 1745 /* if (driver->connect) call it */ 1746 } else if (udc->gadget.speed != USB_SPEED_UNKNOWN) { 1747 udc->gadget.speed = USB_SPEED_UNKNOWN; 1748 if (IS_ERR_OR_NULL(udc->transceiver)) 1749 pullup_disable(udc); 1750 DBG("disconnect, gadget %s\n", 1751 udc->driver->driver.name); 1752 if (udc->driver->disconnect) { 1753 spin_unlock(&udc->lock); 1754 udc->driver->disconnect(&udc->gadget); 1755 spin_lock(&udc->lock); 1756 } 1757 } 1758 change &= ~UDC_ATT; 1759 } 1760 1761 if (change & UDC_USB_RESET) { 1762 if (devstat & UDC_USB_RESET) { 1763 VDBG("RESET=1\n"); 1764 } else { 1765 udc->gadget.speed = USB_SPEED_FULL; 1766 INFO("USB reset done, gadget %s\n", 1767 udc->driver->driver.name); 1768 /* ep0 traffic is legal from now on */ 1769 omap_writew(UDC_DS_CHG_IE | UDC_EP0_IE, 1770 UDC_IRQ_EN); 1771 } 1772 change &= ~UDC_USB_RESET; 1773 } 1774 } 1775 if (change & UDC_SUS) { 1776 if (udc->gadget.speed != USB_SPEED_UNKNOWN) { 1777 /* FIXME tell isp1301 to suspend/resume (?) */ 1778 if (devstat & UDC_SUS) { 1779 VDBG("suspend\n"); 1780 update_otg(udc); 1781 /* HNP could be under way already */ 1782 if (udc->gadget.speed == USB_SPEED_FULL 1783 && udc->driver->suspend) { 1784 spin_unlock(&udc->lock); 1785 udc->driver->suspend(&udc->gadget); 1786 spin_lock(&udc->lock); 1787 } 1788 if (!IS_ERR_OR_NULL(udc->transceiver)) 1789 usb_phy_set_suspend( 1790 udc->transceiver, 1); 1791 } else { 1792 VDBG("resume\n"); 1793 if (!IS_ERR_OR_NULL(udc->transceiver)) 1794 usb_phy_set_suspend( 1795 udc->transceiver, 0); 1796 if (udc->gadget.speed == USB_SPEED_FULL 1797 && udc->driver->resume) { 1798 spin_unlock(&udc->lock); 1799 udc->driver->resume(&udc->gadget); 1800 spin_lock(&udc->lock); 1801 } 1802 } 1803 } 1804 change &= ~UDC_SUS; 1805 } 1806 if (!cpu_is_omap15xx() && (change & OTG_FLAGS)) { 1807 update_otg(udc); 1808 change &= ~OTG_FLAGS; 1809 } 1810 1811 change &= ~(UDC_CFG|UDC_DEF|UDC_ADD); 1812 if (change) 1813 VDBG("devstat %03x, ignore change %03x\n", 1814 devstat, change); 1815 1816 omap_writew(UDC_DS_CHG, UDC_IRQ_SRC); 1817} 1818 1819static irqreturn_t omap_udc_irq(int irq, void *_udc) 1820{ 1821 struct omap_udc *udc = _udc; 1822 u16 irq_src; 1823 irqreturn_t status = IRQ_NONE; 1824 unsigned long flags; 1825 1826 spin_lock_irqsave(&udc->lock, flags); 1827 irq_src = omap_readw(UDC_IRQ_SRC); 1828 1829 /* Device state change (usb ch9 stuff) */ 1830 if (irq_src & UDC_DS_CHG) { 1831 devstate_irq(_udc, irq_src); 1832 status = IRQ_HANDLED; 1833 irq_src &= ~UDC_DS_CHG; 1834 } 1835 1836 /* EP0 control transfers */ 1837 if (irq_src & (UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX)) { 1838 ep0_irq(_udc, irq_src); 1839 status = IRQ_HANDLED; 1840 irq_src &= ~(UDC_EP0_RX|UDC_SETUP|UDC_EP0_TX); 1841 } 1842 1843 /* DMA transfer completion */ 1844 if (use_dma && (irq_src & (UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT))) { 1845 dma_irq(_udc, irq_src); 1846 status = IRQ_HANDLED; 1847 irq_src &= ~(UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT); 1848 } 1849 1850 irq_src &= ~(UDC_IRQ_SOF | UDC_EPN_TX|UDC_EPN_RX); 1851 if (irq_src) 1852 DBG("udc_irq, unhandled %03x\n", irq_src); 1853 spin_unlock_irqrestore(&udc->lock, flags); 1854 1855 return status; 1856} 1857 1858/* workaround for seemingly-lost IRQs for RX ACKs... */ 1859#define PIO_OUT_TIMEOUT (jiffies + HZ/3) 1860#define HALF_FULL(f) (!((f)&(UDC_NON_ISO_FIFO_FULL|UDC_NON_ISO_FIFO_EMPTY))) 1861 1862static void pio_out_timer(struct timer_list *t) 1863{ 1864 struct omap_ep *ep = from_timer(ep, t, timer); 1865 unsigned long flags; 1866 u16 stat_flg; 1867 1868 spin_lock_irqsave(&ep->udc->lock, flags); 1869 if (!list_empty(&ep->queue) && ep->ackwait) { 1870 use_ep(ep, UDC_EP_SEL); 1871 stat_flg = omap_readw(UDC_STAT_FLG); 1872 1873 if ((stat_flg & UDC_ACK) && (!(stat_flg & UDC_FIFO_EN) 1874 || (ep->double_buf && HALF_FULL(stat_flg)))) { 1875 struct omap_req *req; 1876 1877 VDBG("%s: lose, %04x\n", ep->ep.name, stat_flg); 1878 req = container_of(ep->queue.next, 1879 struct omap_req, queue); 1880 (void) read_fifo(ep, req); 1881 omap_writew(ep->bEndpointAddress, UDC_EP_NUM); 1882 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 1883 ep->ackwait = 1 + ep->double_buf; 1884 } else 1885 deselect_ep(); 1886 } 1887 mod_timer(&ep->timer, PIO_OUT_TIMEOUT); 1888 spin_unlock_irqrestore(&ep->udc->lock, flags); 1889} 1890 1891static irqreturn_t omap_udc_pio_irq(int irq, void *_dev) 1892{ 1893 u16 epn_stat, irq_src; 1894 irqreturn_t status = IRQ_NONE; 1895 struct omap_ep *ep; 1896 int epnum; 1897 struct omap_udc *udc = _dev; 1898 struct omap_req *req; 1899 unsigned long flags; 1900 1901 spin_lock_irqsave(&udc->lock, flags); 1902 epn_stat = omap_readw(UDC_EPN_STAT); 1903 irq_src = omap_readw(UDC_IRQ_SRC); 1904 1905 /* handle OUT first, to avoid some wasteful NAKs */ 1906 if (irq_src & UDC_EPN_RX) { 1907 epnum = (epn_stat >> 8) & 0x0f; 1908 omap_writew(UDC_EPN_RX, UDC_IRQ_SRC); 1909 status = IRQ_HANDLED; 1910 ep = &udc->ep[epnum]; 1911 ep->irqs++; 1912 1913 omap_writew(epnum | UDC_EP_SEL, UDC_EP_NUM); 1914 ep->fnf = 0; 1915 if (omap_readw(UDC_STAT_FLG) & UDC_ACK) { 1916 ep->ackwait--; 1917 if (!list_empty(&ep->queue)) { 1918 int stat; 1919 req = container_of(ep->queue.next, 1920 struct omap_req, queue); 1921 stat = read_fifo(ep, req); 1922 if (!ep->double_buf) 1923 ep->fnf = 1; 1924 } 1925 } 1926 /* min 6 clock delay before clearing EP_SEL ... */ 1927 epn_stat = omap_readw(UDC_EPN_STAT); 1928 epn_stat = omap_readw(UDC_EPN_STAT); 1929 omap_writew(epnum, UDC_EP_NUM); 1930 1931 /* enabling fifo _after_ clearing ACK, contrary to docs, 1932 * reduces lossage; timer still needed though (sigh). 1933 */ 1934 if (ep->fnf) { 1935 omap_writew(UDC_SET_FIFO_EN, UDC_CTRL); 1936 ep->ackwait = 1 + ep->double_buf; 1937 } 1938 mod_timer(&ep->timer, PIO_OUT_TIMEOUT); 1939 } 1940 1941 /* then IN transfers */ 1942 else if (irq_src & UDC_EPN_TX) { 1943 epnum = epn_stat & 0x0f; 1944 omap_writew(UDC_EPN_TX, UDC_IRQ_SRC); 1945 status = IRQ_HANDLED; 1946 ep = &udc->ep[16 + epnum]; 1947 ep->irqs++; 1948 1949 omap_writew(epnum | UDC_EP_DIR | UDC_EP_SEL, UDC_EP_NUM); 1950 if (omap_readw(UDC_STAT_FLG) & UDC_ACK) { 1951 ep->ackwait = 0; 1952 if (!list_empty(&ep->queue)) { 1953 req = container_of(ep->queue.next, 1954 struct omap_req, queue); 1955 (void) write_fifo(ep, req); 1956 } 1957 } 1958 /* min 6 clock delay before clearing EP_SEL ... */ 1959 epn_stat = omap_readw(UDC_EPN_STAT); 1960 epn_stat = omap_readw(UDC_EPN_STAT); 1961 omap_writew(epnum | UDC_EP_DIR, UDC_EP_NUM); 1962 /* then 6 clocks before it'd tx */ 1963 } 1964 1965 spin_unlock_irqrestore(&udc->lock, flags); 1966 return status; 1967} 1968 1969#ifdef USE_ISO 1970static irqreturn_t omap_udc_iso_irq(int irq, void *_dev) 1971{ 1972 struct omap_udc *udc = _dev; 1973 struct omap_ep *ep; 1974 int pending = 0; 1975 unsigned long flags; 1976 1977 spin_lock_irqsave(&udc->lock, flags); 1978 1979 /* handle all non-DMA ISO transfers */ 1980 list_for_each_entry(ep, &udc->iso, iso) { 1981 u16 stat; 1982 struct omap_req *req; 1983 1984 if (ep->has_dma || list_empty(&ep->queue)) 1985 continue; 1986 req = list_entry(ep->queue.next, struct omap_req, queue); 1987 1988 use_ep(ep, UDC_EP_SEL); 1989 stat = omap_readw(UDC_STAT_FLG); 1990 1991 /* NOTE: like the other controller drivers, this isn't 1992 * currently reporting lost or damaged frames. 1993 */ 1994 if (ep->bEndpointAddress & USB_DIR_IN) { 1995 if (stat & UDC_MISS_IN) 1996 /* done(ep, req, -EPROTO) */; 1997 else 1998 write_fifo(ep, req); 1999 } else { 2000 int status = 0; 2001 2002 if (stat & UDC_NO_RXPACKET) 2003 status = -EREMOTEIO; 2004 else if (stat & UDC_ISO_ERR) 2005 status = -EILSEQ; 2006 else if (stat & UDC_DATA_FLUSH) 2007 status = -ENOSR; 2008 2009 if (status) 2010 /* done(ep, req, status) */; 2011 else 2012 read_fifo(ep, req); 2013 } 2014 deselect_ep(); 2015 /* 6 wait states before next EP */ 2016 2017 ep->irqs++; 2018 if (!list_empty(&ep->queue)) 2019 pending = 1; 2020 } 2021 if (!pending) { 2022 u16 w; 2023 2024 w = omap_readw(UDC_IRQ_EN); 2025 w &= ~UDC_SOF_IE; 2026 omap_writew(w, UDC_IRQ_EN); 2027 } 2028 omap_writew(UDC_IRQ_SOF, UDC_IRQ_SRC); 2029 2030 spin_unlock_irqrestore(&udc->lock, flags); 2031 return IRQ_HANDLED; 2032} 2033#endif 2034 2035/*-------------------------------------------------------------------------*/ 2036 2037static inline int machine_without_vbus_sense(void) 2038{ 2039 return machine_is_omap_osk() || machine_is_omap_palmte() || 2040 machine_is_sx1(); 2041} 2042 2043static int omap_udc_start(struct usb_gadget *g, 2044 struct usb_gadget_driver *driver) 2045{ 2046 int status; 2047 struct omap_ep *ep; 2048 unsigned long flags; 2049 2050 2051 spin_lock_irqsave(&udc->lock, flags); 2052 /* reset state */ 2053 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) { 2054 ep->irqs = 0; 2055 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) 2056 continue; 2057 use_ep(ep, 0); 2058 omap_writew(UDC_SET_HALT, UDC_CTRL); 2059 } 2060 udc->ep0_pending = 0; 2061 udc->ep[0].irqs = 0; 2062 udc->softconnect = 1; 2063 2064 /* hook up the driver */ 2065 udc->driver = driver; 2066 spin_unlock_irqrestore(&udc->lock, flags); 2067 2068 if (udc->dc_clk != NULL) 2069 omap_udc_enable_clock(1); 2070 2071 omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC); 2072 2073 /* connect to bus through transceiver */ 2074 if (!IS_ERR_OR_NULL(udc->transceiver)) { 2075 status = otg_set_peripheral(udc->transceiver->otg, 2076 &udc->gadget); 2077 if (status < 0) { 2078 ERR("can't bind to transceiver\n"); 2079 udc->driver = NULL; 2080 goto done; 2081 } 2082 } else { 2083 status = 0; 2084 if (can_pullup(udc)) 2085 pullup_enable(udc); 2086 else 2087 pullup_disable(udc); 2088 } 2089 2090 /* boards that don't have VBUS sensing can't autogate 48MHz; 2091 * can't enter deep sleep while a gadget driver is active. 2092 */ 2093 if (machine_without_vbus_sense()) 2094 omap_vbus_session(&udc->gadget, 1); 2095 2096done: 2097 if (udc->dc_clk != NULL) 2098 omap_udc_enable_clock(0); 2099 2100 return status; 2101} 2102 2103static int omap_udc_stop(struct usb_gadget *g) 2104{ 2105 unsigned long flags; 2106 2107 if (udc->dc_clk != NULL) 2108 omap_udc_enable_clock(1); 2109 2110 if (machine_without_vbus_sense()) 2111 omap_vbus_session(&udc->gadget, 0); 2112 2113 if (!IS_ERR_OR_NULL(udc->transceiver)) 2114 (void) otg_set_peripheral(udc->transceiver->otg, NULL); 2115 else 2116 pullup_disable(udc); 2117 2118 spin_lock_irqsave(&udc->lock, flags); 2119 udc_quiesce(udc); 2120 spin_unlock_irqrestore(&udc->lock, flags); 2121 2122 udc->driver = NULL; 2123 2124 if (udc->dc_clk != NULL) 2125 omap_udc_enable_clock(0); 2126 2127 return 0; 2128} 2129 2130/*-------------------------------------------------------------------------*/ 2131 2132#ifdef CONFIG_USB_GADGET_DEBUG_FILES 2133 2134#include <linux/seq_file.h> 2135 2136static const char proc_filename[] = "driver/udc"; 2137 2138#define FOURBITS "%s%s%s%s" 2139#define EIGHTBITS "%s%s%s%s%s%s%s%s" 2140 2141static void proc_ep_show(struct seq_file *s, struct omap_ep *ep) 2142{ 2143 u16 stat_flg; 2144 struct omap_req *req; 2145 char buf[20]; 2146 2147 use_ep(ep, 0); 2148 2149 if (use_dma && ep->has_dma) 2150 snprintf(buf, sizeof buf, "(%cxdma%d lch%d) ", 2151 (ep->bEndpointAddress & USB_DIR_IN) ? 't' : 'r', 2152 ep->dma_channel - 1, ep->lch); 2153 else 2154 buf[0] = 0; 2155 2156 stat_flg = omap_readw(UDC_STAT_FLG); 2157 seq_printf(s, 2158 "\n%s %s%s%sirqs %ld stat %04x " EIGHTBITS FOURBITS "%s\n", 2159 ep->name, buf, 2160 ep->double_buf ? "dbuf " : "", 2161 ({ char *s; 2162 switch (ep->ackwait) { 2163 case 0: 2164 s = ""; 2165 break; 2166 case 1: 2167 s = "(ackw) "; 2168 break; 2169 case 2: 2170 s = "(ackw2) "; 2171 break; 2172 default: 2173 s = "(?) "; 2174 break; 2175 } s; }), 2176 ep->irqs, stat_flg, 2177 (stat_flg & UDC_NO_RXPACKET) ? "no_rxpacket " : "", 2178 (stat_flg & UDC_MISS_IN) ? "miss_in " : "", 2179 (stat_flg & UDC_DATA_FLUSH) ? "data_flush " : "", 2180 (stat_flg & UDC_ISO_ERR) ? "iso_err " : "", 2181 (stat_flg & UDC_ISO_FIFO_EMPTY) ? "iso_fifo_empty " : "", 2182 (stat_flg & UDC_ISO_FIFO_FULL) ? "iso_fifo_full " : "", 2183 (stat_flg & UDC_EP_HALTED) ? "HALT " : "", 2184 (stat_flg & UDC_STALL) ? "STALL " : "", 2185 (stat_flg & UDC_NAK) ? "NAK " : "", 2186 (stat_flg & UDC_ACK) ? "ACK " : "", 2187 (stat_flg & UDC_FIFO_EN) ? "fifo_en " : "", 2188 (stat_flg & UDC_NON_ISO_FIFO_EMPTY) ? "fifo_empty " : "", 2189 (stat_flg & UDC_NON_ISO_FIFO_FULL) ? "fifo_full " : ""); 2190 2191 if (list_empty(&ep->queue)) 2192 seq_printf(s, "\t(queue empty)\n"); 2193 else 2194 list_for_each_entry(req, &ep->queue, queue) { 2195 unsigned length = req->req.actual; 2196 2197 if (use_dma && buf[0]) { 2198 length += ((ep->bEndpointAddress & USB_DIR_IN) 2199 ? dma_src_len : dma_dest_len) 2200 (ep, req->req.dma + length); 2201 buf[0] = 0; 2202 } 2203 seq_printf(s, "\treq %p len %d/%d buf %p\n", 2204 &req->req, length, 2205 req->req.length, req->req.buf); 2206 } 2207} 2208 2209static char *trx_mode(unsigned m, int enabled) 2210{ 2211 switch (m) { 2212 case 0: 2213 return enabled ? "*6wire" : "unused"; 2214 case 1: 2215 return "4wire"; 2216 case 2: 2217 return "3wire"; 2218 case 3: 2219 return "6wire"; 2220 default: 2221 return "unknown"; 2222 } 2223} 2224 2225static int proc_otg_show(struct seq_file *s) 2226{ 2227 u32 tmp; 2228 u32 trans = 0; 2229 char *ctrl_name = "(UNKNOWN)"; 2230 2231 tmp = omap_readl(OTG_REV); 2232 ctrl_name = "transceiver_ctrl"; 2233 trans = omap_readw(USB_TRANSCEIVER_CTRL); 2234 seq_printf(s, "\nOTG rev %d.%d, %s %05x\n", 2235 tmp >> 4, tmp & 0xf, ctrl_name, trans); 2236 tmp = omap_readw(OTG_SYSCON_1); 2237 seq_printf(s, "otg_syscon1 %08x usb2 %s, usb1 %s, usb0 %s," 2238 FOURBITS "\n", tmp, 2239 trx_mode(USB2_TRX_MODE(tmp), trans & CONF_USB2_UNI_R), 2240 trx_mode(USB1_TRX_MODE(tmp), trans & CONF_USB1_UNI_R), 2241 (USB0_TRX_MODE(tmp) == 0 && !cpu_is_omap1710()) 2242 ? "internal" 2243 : trx_mode(USB0_TRX_MODE(tmp), 1), 2244 (tmp & OTG_IDLE_EN) ? " !otg" : "", 2245 (tmp & HST_IDLE_EN) ? " !host" : "", 2246 (tmp & DEV_IDLE_EN) ? " !dev" : "", 2247 (tmp & OTG_RESET_DONE) ? " reset_done" : " reset_active"); 2248 tmp = omap_readl(OTG_SYSCON_2); 2249 seq_printf(s, "otg_syscon2 %08x%s" EIGHTBITS 2250 " b_ase_brst=%d hmc=%d\n", tmp, 2251 (tmp & OTG_EN) ? " otg_en" : "", 2252 (tmp & USBX_SYNCHRO) ? " synchro" : "", 2253 /* much more SRP stuff */ 2254 (tmp & SRP_DATA) ? " srp_data" : "", 2255 (tmp & SRP_VBUS) ? " srp_vbus" : "", 2256 (tmp & OTG_PADEN) ? " otg_paden" : "", 2257 (tmp & HMC_PADEN) ? " hmc_paden" : "", 2258 (tmp & UHOST_EN) ? " uhost_en" : "", 2259 (tmp & HMC_TLLSPEED) ? " tllspeed" : "", 2260 (tmp & HMC_TLLATTACH) ? " tllattach" : "", 2261 B_ASE_BRST(tmp), 2262 OTG_HMC(tmp)); 2263 tmp = omap_readl(OTG_CTRL); 2264 seq_printf(s, "otg_ctrl %06x" EIGHTBITS EIGHTBITS "%s\n", tmp, 2265 (tmp & OTG_ASESSVLD) ? " asess" : "", 2266 (tmp & OTG_BSESSEND) ? " bsess_end" : "", 2267 (tmp & OTG_BSESSVLD) ? " bsess" : "", 2268 (tmp & OTG_VBUSVLD) ? " vbus" : "", 2269 (tmp & OTG_ID) ? " id" : "", 2270 (tmp & OTG_DRIVER_SEL) ? " DEVICE" : " HOST", 2271 (tmp & OTG_A_SETB_HNPEN) ? " a_setb_hnpen" : "", 2272 (tmp & OTG_A_BUSREQ) ? " a_bus" : "", 2273 (tmp & OTG_B_HNPEN) ? " b_hnpen" : "", 2274 (tmp & OTG_B_BUSREQ) ? " b_bus" : "", 2275 (tmp & OTG_BUSDROP) ? " busdrop" : "", 2276 (tmp & OTG_PULLDOWN) ? " down" : "", 2277 (tmp & OTG_PULLUP) ? " up" : "", 2278 (tmp & OTG_DRV_VBUS) ? " drv" : "", 2279 (tmp & OTG_PD_VBUS) ? " pd_vb" : "", 2280 (tmp & OTG_PU_VBUS) ? " pu_vb" : "", 2281 (tmp & OTG_PU_ID) ? " pu_id" : "" 2282 ); 2283 tmp = omap_readw(OTG_IRQ_EN); 2284 seq_printf(s, "otg_irq_en %04x" "\n", tmp); 2285 tmp = omap_readw(OTG_IRQ_SRC); 2286 seq_printf(s, "otg_irq_src %04x" "\n", tmp); 2287 tmp = omap_readw(OTG_OUTCTRL); 2288 seq_printf(s, "otg_outctrl %04x" "\n", tmp); 2289 tmp = omap_readw(OTG_TEST); 2290 seq_printf(s, "otg_test %04x" "\n", tmp); 2291 return 0; 2292} 2293 2294static int proc_udc_show(struct seq_file *s, void *_) 2295{ 2296 u32 tmp; 2297 struct omap_ep *ep; 2298 unsigned long flags; 2299 2300 spin_lock_irqsave(&udc->lock, flags); 2301 2302 seq_printf(s, "%s, version: " DRIVER_VERSION 2303#ifdef USE_ISO 2304 " (iso)" 2305#endif 2306 "%s\n", 2307 driver_desc, 2308 use_dma ? " (dma)" : ""); 2309 2310 tmp = omap_readw(UDC_REV) & 0xff; 2311 seq_printf(s, 2312 "UDC rev %d.%d, fifo mode %d, gadget %s\n" 2313 "hmc %d, transceiver %s\n", 2314 tmp >> 4, tmp & 0xf, 2315 fifo_mode, 2316 udc->driver ? udc->driver->driver.name : "(none)", 2317 HMC, 2318 udc->transceiver 2319 ? udc->transceiver->label 2320 : (cpu_is_omap1710() 2321 ? "external" : "(none)")); 2322 seq_printf(s, "ULPD control %04x req %04x status %04x\n", 2323 omap_readw(ULPD_CLOCK_CTRL), 2324 omap_readw(ULPD_SOFT_REQ), 2325 omap_readw(ULPD_STATUS_REQ)); 2326 2327 /* OTG controller registers */ 2328 if (!cpu_is_omap15xx()) 2329 proc_otg_show(s); 2330 2331 tmp = omap_readw(UDC_SYSCON1); 2332 seq_printf(s, "\nsyscon1 %04x" EIGHTBITS "\n", tmp, 2333 (tmp & UDC_CFG_LOCK) ? " cfg_lock" : "", 2334 (tmp & UDC_DATA_ENDIAN) ? " data_endian" : "", 2335 (tmp & UDC_DMA_ENDIAN) ? " dma_endian" : "", 2336 (tmp & UDC_NAK_EN) ? " nak" : "", 2337 (tmp & UDC_AUTODECODE_DIS) ? " autodecode_dis" : "", 2338 (tmp & UDC_SELF_PWR) ? " self_pwr" : "", 2339 (tmp & UDC_SOFF_DIS) ? " soff_dis" : "", 2340 (tmp & UDC_PULLUP_EN) ? " PULLUP" : ""); 2341 /* syscon2 is write-only */ 2342 2343 /* UDC controller registers */ 2344 if (!(tmp & UDC_PULLUP_EN)) { 2345 seq_printf(s, "(suspended)\n"); 2346 spin_unlock_irqrestore(&udc->lock, flags); 2347 return 0; 2348 } 2349 2350 tmp = omap_readw(UDC_DEVSTAT); 2351 seq_printf(s, "devstat %04x" EIGHTBITS "%s%s\n", tmp, 2352 (tmp & UDC_B_HNP_ENABLE) ? " b_hnp" : "", 2353 (tmp & UDC_A_HNP_SUPPORT) ? " a_hnp" : "", 2354 (tmp & UDC_A_ALT_HNP_SUPPORT) ? " a_alt_hnp" : "", 2355 (tmp & UDC_R_WK_OK) ? " r_wk_ok" : "", 2356 (tmp & UDC_USB_RESET) ? " usb_reset" : "", 2357 (tmp & UDC_SUS) ? " SUS" : "", 2358 (tmp & UDC_CFG) ? " CFG" : "", 2359 (tmp & UDC_ADD) ? " ADD" : "", 2360 (tmp & UDC_DEF) ? " DEF" : "", 2361 (tmp & UDC_ATT) ? " ATT" : ""); 2362 seq_printf(s, "sof %04x\n", omap_readw(UDC_SOF)); 2363 tmp = omap_readw(UDC_IRQ_EN); 2364 seq_printf(s, "irq_en %04x" FOURBITS "%s\n", tmp, 2365 (tmp & UDC_SOF_IE) ? " sof" : "", 2366 (tmp & UDC_EPN_RX_IE) ? " epn_rx" : "", 2367 (tmp & UDC_EPN_TX_IE) ? " epn_tx" : "", 2368 (tmp & UDC_DS_CHG_IE) ? " ds_chg" : "", 2369 (tmp & UDC_EP0_IE) ? " ep0" : ""); 2370 tmp = omap_readw(UDC_IRQ_SRC); 2371 seq_printf(s, "irq_src %04x" EIGHTBITS "%s%s\n", tmp, 2372 (tmp & UDC_TXN_DONE) ? " txn_done" : "", 2373 (tmp & UDC_RXN_CNT) ? " rxn_cnt" : "", 2374 (tmp & UDC_RXN_EOT) ? " rxn_eot" : "", 2375 (tmp & UDC_IRQ_SOF) ? " sof" : "", 2376 (tmp & UDC_EPN_RX) ? " epn_rx" : "", 2377 (tmp & UDC_EPN_TX) ? " epn_tx" : "", 2378 (tmp & UDC_DS_CHG) ? " ds_chg" : "", 2379 (tmp & UDC_SETUP) ? " setup" : "", 2380 (tmp & UDC_EP0_RX) ? " ep0out" : "", 2381 (tmp & UDC_EP0_TX) ? " ep0in" : ""); 2382 if (use_dma) { 2383 unsigned i; 2384 2385 tmp = omap_readw(UDC_DMA_IRQ_EN); 2386 seq_printf(s, "dma_irq_en %04x%s" EIGHTBITS "\n", tmp, 2387 (tmp & UDC_TX_DONE_IE(3)) ? " tx2_done" : "", 2388 (tmp & UDC_RX_CNT_IE(3)) ? " rx2_cnt" : "", 2389 (tmp & UDC_RX_EOT_IE(3)) ? " rx2_eot" : "", 2390 2391 (tmp & UDC_TX_DONE_IE(2)) ? " tx1_done" : "", 2392 (tmp & UDC_RX_CNT_IE(2)) ? " rx1_cnt" : "", 2393 (tmp & UDC_RX_EOT_IE(2)) ? " rx1_eot" : "", 2394 2395 (tmp & UDC_TX_DONE_IE(1)) ? " tx0_done" : "", 2396 (tmp & UDC_RX_CNT_IE(1)) ? " rx0_cnt" : "", 2397 (tmp & UDC_RX_EOT_IE(1)) ? " rx0_eot" : ""); 2398 2399 tmp = omap_readw(UDC_RXDMA_CFG); 2400 seq_printf(s, "rxdma_cfg %04x\n", tmp); 2401 if (tmp) { 2402 for (i = 0; i < 3; i++) { 2403 if ((tmp & (0x0f << (i * 4))) == 0) 2404 continue; 2405 seq_printf(s, "rxdma[%d] %04x\n", i, 2406 omap_readw(UDC_RXDMA(i + 1))); 2407 } 2408 } 2409 tmp = omap_readw(UDC_TXDMA_CFG); 2410 seq_printf(s, "txdma_cfg %04x\n", tmp); 2411 if (tmp) { 2412 for (i = 0; i < 3; i++) { 2413 if (!(tmp & (0x0f << (i * 4)))) 2414 continue; 2415 seq_printf(s, "txdma[%d] %04x\n", i, 2416 omap_readw(UDC_TXDMA(i + 1))); 2417 } 2418 } 2419 } 2420 2421 tmp = omap_readw(UDC_DEVSTAT); 2422 if (tmp & UDC_ATT) { 2423 proc_ep_show(s, &udc->ep[0]); 2424 if (tmp & UDC_ADD) { 2425 list_for_each_entry(ep, &udc->gadget.ep_list, 2426 ep.ep_list) { 2427 if (ep->ep.desc) 2428 proc_ep_show(s, ep); 2429 } 2430 } 2431 } 2432 spin_unlock_irqrestore(&udc->lock, flags); 2433 return 0; 2434} 2435 2436static void create_proc_file(void) 2437{ 2438 proc_create_single(proc_filename, 0, NULL, proc_udc_show); 2439} 2440 2441static void remove_proc_file(void) 2442{ 2443 remove_proc_entry(proc_filename, NULL); 2444} 2445 2446#else 2447 2448static inline void create_proc_file(void) {} 2449static inline void remove_proc_file(void) {} 2450 2451#endif 2452 2453/*-------------------------------------------------------------------------*/ 2454 2455/* Before this controller can enumerate, we need to pick an endpoint 2456 * configuration, or "fifo_mode" That involves allocating 2KB of packet 2457 * buffer space among the endpoints we'll be operating. 2458 * 2459 * NOTE: as of OMAP 1710 ES2.0, writing a new endpoint config when 2460 * UDC_SYSCON_1.CFG_LOCK is set can now work. We won't use that 2461 * capability yet though. 2462 */ 2463static unsigned 2464omap_ep_setup(char *name, u8 addr, u8 type, 2465 unsigned buf, unsigned maxp, int dbuf) 2466{ 2467 struct omap_ep *ep; 2468 u16 epn_rxtx = 0; 2469 2470 /* OUT endpoints first, then IN */ 2471 ep = &udc->ep[addr & 0xf]; 2472 if (addr & USB_DIR_IN) 2473 ep += 16; 2474 2475 /* in case of ep init table bugs */ 2476 BUG_ON(ep->name[0]); 2477 2478 /* chip setup ... bit values are same for IN, OUT */ 2479 if (type == USB_ENDPOINT_XFER_ISOC) { 2480 switch (maxp) { 2481 case 8: 2482 epn_rxtx = 0 << 12; 2483 break; 2484 case 16: 2485 epn_rxtx = 1 << 12; 2486 break; 2487 case 32: 2488 epn_rxtx = 2 << 12; 2489 break; 2490 case 64: 2491 epn_rxtx = 3 << 12; 2492 break; 2493 case 128: 2494 epn_rxtx = 4 << 12; 2495 break; 2496 case 256: 2497 epn_rxtx = 5 << 12; 2498 break; 2499 case 512: 2500 epn_rxtx = 6 << 12; 2501 break; 2502 default: 2503 BUG(); 2504 } 2505 epn_rxtx |= UDC_EPN_RX_ISO; 2506 dbuf = 1; 2507 } else { 2508 /* double-buffering "not supported" on 15xx, 2509 * and ignored for PIO-IN on newer chips 2510 * (for more reliable behavior) 2511 */ 2512 if (!use_dma || cpu_is_omap15xx()) 2513 dbuf = 0; 2514 2515 switch (maxp) { 2516 case 8: 2517 epn_rxtx = 0 << 12; 2518 break; 2519 case 16: 2520 epn_rxtx = 1 << 12; 2521 break; 2522 case 32: 2523 epn_rxtx = 2 << 12; 2524 break; 2525 case 64: 2526 epn_rxtx = 3 << 12; 2527 break; 2528 default: 2529 BUG(); 2530 } 2531 if (dbuf && addr) 2532 epn_rxtx |= UDC_EPN_RX_DB; 2533 timer_setup(&ep->timer, pio_out_timer, 0); 2534 } 2535 if (addr) 2536 epn_rxtx |= UDC_EPN_RX_VALID; 2537 BUG_ON(buf & 0x07); 2538 epn_rxtx |= buf >> 3; 2539 2540 DBG("%s addr %02x rxtx %04x maxp %d%s buf %d\n", 2541 name, addr, epn_rxtx, maxp, dbuf ? "x2" : "", buf); 2542 2543 if (addr & USB_DIR_IN) 2544 omap_writew(epn_rxtx, UDC_EP_TX(addr & 0xf)); 2545 else 2546 omap_writew(epn_rxtx, UDC_EP_RX(addr)); 2547 2548 /* next endpoint's buffer starts after this one's */ 2549 buf += maxp; 2550 if (dbuf) 2551 buf += maxp; 2552 BUG_ON(buf > 2048); 2553 2554 /* set up driver data structures */ 2555 BUG_ON(strlen(name) >= sizeof ep->name); 2556 strscpy(ep->name, name, sizeof(ep->name)); 2557 INIT_LIST_HEAD(&ep->queue); 2558 INIT_LIST_HEAD(&ep->iso); 2559 ep->bEndpointAddress = addr; 2560 ep->bmAttributes = type; 2561 ep->double_buf = dbuf; 2562 ep->udc = udc; 2563 2564 switch (type) { 2565 case USB_ENDPOINT_XFER_CONTROL: 2566 ep->ep.caps.type_control = true; 2567 ep->ep.caps.dir_in = true; 2568 ep->ep.caps.dir_out = true; 2569 break; 2570 case USB_ENDPOINT_XFER_ISOC: 2571 ep->ep.caps.type_iso = true; 2572 break; 2573 case USB_ENDPOINT_XFER_BULK: 2574 ep->ep.caps.type_bulk = true; 2575 break; 2576 case USB_ENDPOINT_XFER_INT: 2577 ep->ep.caps.type_int = true; 2578 break; 2579 } 2580 2581 if (addr & USB_DIR_IN) 2582 ep->ep.caps.dir_in = true; 2583 else 2584 ep->ep.caps.dir_out = true; 2585 2586 ep->ep.name = ep->name; 2587 ep->ep.ops = &omap_ep_ops; 2588 ep->maxpacket = maxp; 2589 usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket); 2590 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); 2591 2592 return buf; 2593} 2594 2595static void omap_udc_release(struct device *dev) 2596{ 2597 pullup_disable(udc); 2598 if (!IS_ERR_OR_NULL(udc->transceiver)) { 2599 usb_put_phy(udc->transceiver); 2600 udc->transceiver = NULL; 2601 } 2602 omap_writew(0, UDC_SYSCON1); 2603 remove_proc_file(); 2604 if (udc->dc_clk) { 2605 if (udc->clk_requested) 2606 omap_udc_enable_clock(0); 2607 clk_unprepare(udc->hhc_clk); 2608 clk_unprepare(udc->dc_clk); 2609 clk_put(udc->hhc_clk); 2610 clk_put(udc->dc_clk); 2611 } 2612 if (udc->done) 2613 complete(udc->done); 2614 kfree(udc); 2615} 2616 2617static int 2618omap_udc_setup(struct platform_device *odev, struct usb_phy *xceiv) 2619{ 2620 unsigned tmp, buf; 2621 2622 /* abolish any previous hardware state */ 2623 omap_writew(0, UDC_SYSCON1); 2624 omap_writew(0, UDC_IRQ_EN); 2625 omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC); 2626 omap_writew(0, UDC_DMA_IRQ_EN); 2627 omap_writew(0, UDC_RXDMA_CFG); 2628 omap_writew(0, UDC_TXDMA_CFG); 2629 2630 /* UDC_PULLUP_EN gates the chip clock */ 2631 /* OTG_SYSCON_1 |= DEV_IDLE_EN; */ 2632 2633 udc = kzalloc(sizeof(*udc), GFP_KERNEL); 2634 if (!udc) 2635 return -ENOMEM; 2636 2637 spin_lock_init(&udc->lock); 2638 2639 udc->gadget.ops = &omap_gadget_ops; 2640 udc->gadget.ep0 = &udc->ep[0].ep; 2641 INIT_LIST_HEAD(&udc->gadget.ep_list); 2642 INIT_LIST_HEAD(&udc->iso); 2643 udc->gadget.speed = USB_SPEED_UNKNOWN; 2644 udc->gadget.max_speed = USB_SPEED_FULL; 2645 udc->gadget.name = driver_name; 2646 udc->gadget.quirk_ep_out_aligned_size = 1; 2647 udc->transceiver = xceiv; 2648 2649 /* ep0 is special; put it right after the SETUP buffer */ 2650 buf = omap_ep_setup("ep0", 0, USB_ENDPOINT_XFER_CONTROL, 2651 8 /* after SETUP */, 64 /* maxpacket */, 0); 2652 list_del_init(&udc->ep[0].ep.ep_list); 2653 2654 /* initially disable all non-ep0 endpoints */ 2655 for (tmp = 1; tmp < 15; tmp++) { 2656 omap_writew(0, UDC_EP_RX(tmp)); 2657 omap_writew(0, UDC_EP_TX(tmp)); 2658 } 2659 2660#define OMAP_BULK_EP(name, addr) \ 2661 buf = omap_ep_setup(name "-bulk", addr, \ 2662 USB_ENDPOINT_XFER_BULK, buf, 64, 1); 2663#define OMAP_INT_EP(name, addr, maxp) \ 2664 buf = omap_ep_setup(name "-int", addr, \ 2665 USB_ENDPOINT_XFER_INT, buf, maxp, 0); 2666#define OMAP_ISO_EP(name, addr, maxp) \ 2667 buf = omap_ep_setup(name "-iso", addr, \ 2668 USB_ENDPOINT_XFER_ISOC, buf, maxp, 1); 2669 2670 switch (fifo_mode) { 2671 case 0: 2672 OMAP_BULK_EP("ep1in", USB_DIR_IN | 1); 2673 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2); 2674 OMAP_INT_EP("ep3in", USB_DIR_IN | 3, 16); 2675 break; 2676 case 1: 2677 OMAP_BULK_EP("ep1in", USB_DIR_IN | 1); 2678 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2); 2679 OMAP_INT_EP("ep9in", USB_DIR_IN | 9, 16); 2680 2681 OMAP_BULK_EP("ep3in", USB_DIR_IN | 3); 2682 OMAP_BULK_EP("ep4out", USB_DIR_OUT | 4); 2683 OMAP_INT_EP("ep10in", USB_DIR_IN | 10, 16); 2684 2685 OMAP_BULK_EP("ep5in", USB_DIR_IN | 5); 2686 OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5); 2687 OMAP_INT_EP("ep11in", USB_DIR_IN | 11, 16); 2688 2689 OMAP_BULK_EP("ep6in", USB_DIR_IN | 6); 2690 OMAP_BULK_EP("ep6out", USB_DIR_OUT | 6); 2691 OMAP_INT_EP("ep12in", USB_DIR_IN | 12, 16); 2692 2693 OMAP_BULK_EP("ep7in", USB_DIR_IN | 7); 2694 OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7); 2695 OMAP_INT_EP("ep13in", USB_DIR_IN | 13, 16); 2696 OMAP_INT_EP("ep13out", USB_DIR_OUT | 13, 16); 2697 2698 OMAP_BULK_EP("ep8in", USB_DIR_IN | 8); 2699 OMAP_BULK_EP("ep8out", USB_DIR_OUT | 8); 2700 OMAP_INT_EP("ep14in", USB_DIR_IN | 14, 16); 2701 OMAP_INT_EP("ep14out", USB_DIR_OUT | 14, 16); 2702 2703 OMAP_BULK_EP("ep15in", USB_DIR_IN | 15); 2704 OMAP_BULK_EP("ep15out", USB_DIR_OUT | 15); 2705 2706 break; 2707 2708#ifdef USE_ISO 2709 case 2: /* mixed iso/bulk */ 2710 OMAP_ISO_EP("ep1in", USB_DIR_IN | 1, 256); 2711 OMAP_ISO_EP("ep2out", USB_DIR_OUT | 2, 256); 2712 OMAP_ISO_EP("ep3in", USB_DIR_IN | 3, 128); 2713 OMAP_ISO_EP("ep4out", USB_DIR_OUT | 4, 128); 2714 2715 OMAP_INT_EP("ep5in", USB_DIR_IN | 5, 16); 2716 2717 OMAP_BULK_EP("ep6in", USB_DIR_IN | 6); 2718 OMAP_BULK_EP("ep7out", USB_DIR_OUT | 7); 2719 OMAP_INT_EP("ep8in", USB_DIR_IN | 8, 16); 2720 break; 2721 case 3: /* mixed bulk/iso */ 2722 OMAP_BULK_EP("ep1in", USB_DIR_IN | 1); 2723 OMAP_BULK_EP("ep2out", USB_DIR_OUT | 2); 2724 OMAP_INT_EP("ep3in", USB_DIR_IN | 3, 16); 2725 2726 OMAP_BULK_EP("ep4in", USB_DIR_IN | 4); 2727 OMAP_BULK_EP("ep5out", USB_DIR_OUT | 5); 2728 OMAP_INT_EP("ep6in", USB_DIR_IN | 6, 16); 2729 2730 OMAP_ISO_EP("ep7in", USB_DIR_IN | 7, 256); 2731 OMAP_ISO_EP("ep8out", USB_DIR_OUT | 8, 256); 2732 OMAP_INT_EP("ep9in", USB_DIR_IN | 9, 16); 2733 break; 2734#endif 2735 2736 /* add more modes as needed */ 2737 2738 default: 2739 ERR("unsupported fifo_mode #%d\n", fifo_mode); 2740 return -ENODEV; 2741 } 2742 omap_writew(UDC_CFG_LOCK|UDC_SELF_PWR, UDC_SYSCON1); 2743 INFO("fifo mode %d, %d bytes not used\n", fifo_mode, 2048 - buf); 2744 return 0; 2745} 2746 2747static int omap_udc_probe(struct platform_device *pdev) 2748{ 2749 int status = -ENODEV; 2750 int hmc; 2751 struct usb_phy *xceiv = NULL; 2752 const char *type = NULL; 2753 struct omap_usb_config *config = dev_get_platdata(&pdev->dev); 2754 struct clk *dc_clk = NULL; 2755 struct clk *hhc_clk = NULL; 2756 2757 /* NOTE: "knows" the order of the resources! */ 2758 if (!request_mem_region(pdev->resource[0].start, 2759 resource_size(&pdev->resource[0]), 2760 driver_name)) { 2761 DBG("request_mem_region failed\n"); 2762 return -EBUSY; 2763 } 2764 2765 if (cpu_is_omap16xx()) { 2766 dc_clk = clk_get(&pdev->dev, "usb_dc_ck"); 2767 hhc_clk = clk_get(&pdev->dev, "usb_hhc_ck"); 2768 BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk)); 2769 /* can't use omap_udc_enable_clock yet */ 2770 clk_prepare_enable(dc_clk); 2771 clk_prepare_enable(hhc_clk); 2772 udelay(100); 2773 } 2774 2775 INFO("OMAP UDC rev %d.%d%s\n", 2776 omap_readw(UDC_REV) >> 4, omap_readw(UDC_REV) & 0xf, 2777 config->otg ? ", Mini-AB" : ""); 2778 2779 /* use the mode given to us by board init code */ 2780 if (cpu_is_omap15xx()) { 2781 hmc = HMC_1510; 2782 type = "(unknown)"; 2783 2784 if (machine_without_vbus_sense()) { 2785 /* just set up software VBUS detect, and then 2786 * later rig it so we always report VBUS. 2787 * FIXME without really sensing VBUS, we can't 2788 * know when to turn PULLUP_EN on/off; and that 2789 * means we always "need" the 48MHz clock. 2790 */ 2791 u32 tmp = omap_readl(FUNC_MUX_CTRL_0); 2792 tmp &= ~VBUS_CTRL_1510; 2793 omap_writel(tmp, FUNC_MUX_CTRL_0); 2794 tmp |= VBUS_MODE_1510; 2795 tmp &= ~VBUS_CTRL_1510; 2796 omap_writel(tmp, FUNC_MUX_CTRL_0); 2797 } 2798 } else { 2799 /* The transceiver may package some GPIO logic or handle 2800 * loopback and/or transceiverless setup; if we find one, 2801 * use it. Except for OTG, we don't _need_ to talk to one; 2802 * but not having one probably means no VBUS detection. 2803 */ 2804 xceiv = usb_get_phy(USB_PHY_TYPE_USB2); 2805 if (!IS_ERR_OR_NULL(xceiv)) 2806 type = xceiv->label; 2807 else if (config->otg) { 2808 DBG("OTG requires external transceiver!\n"); 2809 goto cleanup0; 2810 } 2811 2812 hmc = HMC_1610; 2813 2814 switch (hmc) { 2815 case 0: /* POWERUP DEFAULT == 0 */ 2816 case 4: 2817 case 12: 2818 case 20: 2819 if (!cpu_is_omap1710()) { 2820 type = "integrated"; 2821 break; 2822 } 2823 fallthrough; 2824 case 3: 2825 case 11: 2826 case 16: 2827 case 19: 2828 case 25: 2829 if (IS_ERR_OR_NULL(xceiv)) { 2830 DBG("external transceiver not registered!\n"); 2831 type = "unknown"; 2832 } 2833 break; 2834 case 21: /* internal loopback */ 2835 type = "loopback"; 2836 break; 2837 case 14: /* transceiverless */ 2838 if (cpu_is_omap1710()) 2839 goto bad_on_1710; 2840 fallthrough; 2841 case 13: 2842 case 15: 2843 type = "no"; 2844 break; 2845 2846 default: 2847bad_on_1710: 2848 ERR("unrecognized UDC HMC mode %d\n", hmc); 2849 goto cleanup0; 2850 } 2851 } 2852 2853 INFO("hmc mode %d, %s transceiver\n", hmc, type); 2854 2855 /* a "gadget" abstracts/virtualizes the controller */ 2856 status = omap_udc_setup(pdev, xceiv); 2857 if (status) 2858 goto cleanup0; 2859 2860 xceiv = NULL; 2861 /* "udc" is now valid */ 2862 pullup_disable(udc); 2863#if IS_ENABLED(CONFIG_USB_OHCI_HCD) 2864 udc->gadget.is_otg = (config->otg != 0); 2865#endif 2866 2867 /* starting with omap1710 es2.0, clear toggle is a separate bit */ 2868 if (omap_readw(UDC_REV) >= 0x61) 2869 udc->clr_halt = UDC_RESET_EP | UDC_CLRDATA_TOGGLE; 2870 else 2871 udc->clr_halt = UDC_RESET_EP; 2872 2873 /* USB general purpose IRQ: ep0, state changes, dma, etc */ 2874 status = devm_request_irq(&pdev->dev, pdev->resource[1].start, 2875 omap_udc_irq, 0, driver_name, udc); 2876 if (status != 0) { 2877 ERR("can't get irq %d, err %d\n", 2878 (int) pdev->resource[1].start, status); 2879 goto cleanup1; 2880 } 2881 2882 /* USB "non-iso" IRQ (PIO for all but ep0) */ 2883 status = devm_request_irq(&pdev->dev, pdev->resource[2].start, 2884 omap_udc_pio_irq, 0, "omap_udc pio", udc); 2885 if (status != 0) { 2886 ERR("can't get irq %d, err %d\n", 2887 (int) pdev->resource[2].start, status); 2888 goto cleanup1; 2889 } 2890#ifdef USE_ISO 2891 status = devm_request_irq(&pdev->dev, pdev->resource[3].start, 2892 omap_udc_iso_irq, 0, "omap_udc iso", udc); 2893 if (status != 0) { 2894 ERR("can't get irq %d, err %d\n", 2895 (int) pdev->resource[3].start, status); 2896 goto cleanup1; 2897 } 2898#endif 2899 if (cpu_is_omap16xx()) { 2900 udc->dc_clk = dc_clk; 2901 udc->hhc_clk = hhc_clk; 2902 clk_disable(hhc_clk); 2903 clk_disable(dc_clk); 2904 } 2905 2906 create_proc_file(); 2907 return usb_add_gadget_udc_release(&pdev->dev, &udc->gadget, 2908 omap_udc_release); 2909 2910cleanup1: 2911 kfree(udc); 2912 udc = NULL; 2913 2914cleanup0: 2915 if (!IS_ERR_OR_NULL(xceiv)) 2916 usb_put_phy(xceiv); 2917 2918 if (cpu_is_omap16xx()) { 2919 clk_disable_unprepare(hhc_clk); 2920 clk_disable_unprepare(dc_clk); 2921 clk_put(hhc_clk); 2922 clk_put(dc_clk); 2923 } 2924 2925 release_mem_region(pdev->resource[0].start, 2926 resource_size(&pdev->resource[0])); 2927 2928 return status; 2929} 2930 2931static void omap_udc_remove(struct platform_device *pdev) 2932{ 2933 DECLARE_COMPLETION_ONSTACK(done); 2934 2935 udc->done = &done; 2936 2937 usb_del_gadget_udc(&udc->gadget); 2938 2939 wait_for_completion(&done); 2940 2941 release_mem_region(pdev->resource[0].start, 2942 resource_size(&pdev->resource[0])); 2943} 2944 2945/* suspend/resume/wakeup from sysfs (echo > power/state) or when the 2946 * system is forced into deep sleep 2947 * 2948 * REVISIT we should probably reject suspend requests when there's a host 2949 * session active, rather than disconnecting, at least on boards that can 2950 * report VBUS irqs (UDC_DEVSTAT.UDC_ATT). And in any case, we need to 2951 * make host resumes and VBUS detection trigger OMAP wakeup events; that 2952 * may involve talking to an external transceiver (e.g. isp1301). 2953 */ 2954 2955static int omap_udc_suspend(struct platform_device *dev, pm_message_t message) 2956{ 2957 u32 devstat; 2958 2959 devstat = omap_readw(UDC_DEVSTAT); 2960 2961 /* we're requesting 48 MHz clock if the pullup is enabled 2962 * (== we're attached to the host) and we're not suspended, 2963 * which would prevent entry to deep sleep... 2964 */ 2965 if ((devstat & UDC_ATT) != 0 && (devstat & UDC_SUS) == 0) { 2966 WARNING("session active; suspend requires disconnect\n"); 2967 omap_pullup(&udc->gadget, 0); 2968 } 2969 2970 return 0; 2971} 2972 2973static int omap_udc_resume(struct platform_device *dev) 2974{ 2975 DBG("resume + wakeup/SRP\n"); 2976 omap_pullup(&udc->gadget, 1); 2977 2978 /* maybe the host would enumerate us if we nudged it */ 2979 msleep(100); 2980 return omap_wakeup(&udc->gadget); 2981} 2982 2983/*-------------------------------------------------------------------------*/ 2984 2985static struct platform_driver udc_driver = { 2986 .probe = omap_udc_probe, 2987 .remove_new = omap_udc_remove, 2988 .suspend = omap_udc_suspend, 2989 .resume = omap_udc_resume, 2990 .driver = { 2991 .name = driver_name, 2992 }, 2993}; 2994 2995module_platform_driver(udc_driver); 2996 2997MODULE_DESCRIPTION(DRIVER_DESC); 2998MODULE_LICENSE("GPL"); 2999MODULE_ALIAS("platform:omap_udc"); 3000