1 /* 2 * MUSB OTG driver peripheral support 3 * 4 * Copyright 2005 Mentor Graphics Corporation 5 * Copyright (C) 2005-2006 by Texas Instruments 6 * Copyright (C) 2006-2007 Nokia Corporation 7 * Copyright (C) 2009 MontaVista Software, Inc. <source@mvista.com> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * version 2 as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 21 * 02110-1301 USA 22 * 23 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 26 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 29 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 30 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 */ 35 36 #include <linux/kernel.h> 37 #include <linux/list.h> 38 #include <linux/timer.h> 39 #include <linux/module.h> 40 #include <linux/smp.h> 41 #include <linux/spinlock.h> 42 #include <linux/delay.h> 43 #include <linux/dma-mapping.h> 44 #include <linux/slab.h> 45 46 #include "musb_core.h" 47 #include "musb_trace.h" 48 49 50 /* ----------------------------------------------------------------------- */ 51 52 #define is_buffer_mapped(req) (is_dma_capable() && \ 53 (req->map_state != UN_MAPPED)) 54 55 /* Maps the buffer to dma */ 56 57 static inline void map_dma_buffer(struct musb_request *request, 58 struct musb *musb, struct musb_ep *musb_ep) 59 { 60 int compatible = true; 61 struct dma_controller *dma = musb->dma_controller; 62 63 request->map_state = UN_MAPPED; 64 65 if (!is_dma_capable() || !musb_ep->dma) 66 return; 67 68 /* Check if DMA engine can handle this request. 69 * DMA code must reject the USB request explicitly. 70 * Default behaviour is to map the request. 71 */ 72 if (dma->is_compatible) 73 compatible = dma->is_compatible(musb_ep->dma, 74 musb_ep->packet_sz, request->request.buf, 75 request->request.length); 76 if (!compatible) 77 return; 78 79 if (request->request.dma == DMA_ADDR_INVALID) { 80 dma_addr_t dma_addr; 81 int ret; 82 83 dma_addr = dma_map_single( 84 musb->controller, 85 request->request.buf, 86 request->request.length, 87 request->tx 88 ? DMA_TO_DEVICE 89 : DMA_FROM_DEVICE); 90 ret = dma_mapping_error(musb->controller, dma_addr); 91 if (ret) 92 return; 93 94 request->request.dma = dma_addr; 95 request->map_state = MUSB_MAPPED; 96 } else { 97 dma_sync_single_for_device(musb->controller, 98 request->request.dma, 99 request->request.length, 100 request->tx 101 ? DMA_TO_DEVICE 102 : DMA_FROM_DEVICE); 103 request->map_state = PRE_MAPPED; 104 } 105 } 106 107 /* Unmap the buffer from dma and maps it back to cpu */ 108 static inline void unmap_dma_buffer(struct musb_request *request, 109 struct musb *musb) 110 { 111 struct musb_ep *musb_ep = request->ep; 112 113 if (!is_buffer_mapped(request) || !musb_ep->dma) 114 return; 115 116 if (request->request.dma == DMA_ADDR_INVALID) { 117 dev_vdbg(musb->controller, 118 "not unmapping a never mapped buffer\n"); 119 return; 120 } 121 if (request->map_state == MUSB_MAPPED) { 122 dma_unmap_single(musb->controller, 123 request->request.dma, 124 request->request.length, 125 request->tx 126 ? DMA_TO_DEVICE 127 : DMA_FROM_DEVICE); 128 request->request.dma = DMA_ADDR_INVALID; 129 } else { /* PRE_MAPPED */ 130 dma_sync_single_for_cpu(musb->controller, 131 request->request.dma, 132 request->request.length, 133 request->tx 134 ? DMA_TO_DEVICE 135 : DMA_FROM_DEVICE); 136 } 137 request->map_state = UN_MAPPED; 138 } 139 140 /* 141 * Immediately complete a request. 142 * 143 * @param request the request to complete 144 * @param status the status to complete the request with 145 * Context: controller locked, IRQs blocked. 146 */ 147 void musb_g_giveback( 148 struct musb_ep *ep, 149 struct usb_request *request, 150 int status) 151 __releases(ep->musb->lock) 152 __acquires(ep->musb->lock) 153 { 154 struct musb_request *req; 155 struct musb *musb; 156 int busy = ep->busy; 157 158 req = to_musb_request(request); 159 160 list_del(&req->list); 161 if (req->request.status == -EINPROGRESS) 162 req->request.status = status; 163 musb = req->musb; 164 165 ep->busy = 1; 166 spin_unlock(&musb->lock); 167 168 if (!dma_mapping_error(&musb->g.dev, request->dma)) 169 unmap_dma_buffer(req, musb); 170 171 trace_musb_req_gb(req); 172 usb_gadget_giveback_request(&req->ep->end_point, &req->request); 173 spin_lock(&musb->lock); 174 ep->busy = busy; 175 } 176 177 /* ----------------------------------------------------------------------- */ 178 179 /* 180 * Abort requests queued to an endpoint using the status. Synchronous. 181 * caller locked controller and blocked irqs, and selected this ep. 182 */ 183 static void nuke(struct musb_ep *ep, const int status) 184 { 185 struct musb *musb = ep->musb; 186 struct musb_request *req = NULL; 187 void __iomem *epio = ep->musb->endpoints[ep->current_epnum].regs; 188 189 ep->busy = 1; 190 191 if (is_dma_capable() && ep->dma) { 192 struct dma_controller *c = ep->musb->dma_controller; 193 int value; 194 195 if (ep->is_in) { 196 /* 197 * The programming guide says that we must not clear 198 * the DMAMODE bit before DMAENAB, so we only 199 * clear it in the second write... 200 */ 201 musb_writew(epio, MUSB_TXCSR, 202 MUSB_TXCSR_DMAMODE | MUSB_TXCSR_FLUSHFIFO); 203 musb_writew(epio, MUSB_TXCSR, 204 0 | MUSB_TXCSR_FLUSHFIFO); 205 } else { 206 musb_writew(epio, MUSB_RXCSR, 207 0 | MUSB_RXCSR_FLUSHFIFO); 208 musb_writew(epio, MUSB_RXCSR, 209 0 | MUSB_RXCSR_FLUSHFIFO); 210 } 211 212 value = c->channel_abort(ep->dma); 213 musb_dbg(musb, "%s: abort DMA --> %d", ep->name, value); 214 c->channel_release(ep->dma); 215 ep->dma = NULL; 216 } 217 218 while (!list_empty(&ep->req_list)) { 219 req = list_first_entry(&ep->req_list, struct musb_request, list); 220 musb_g_giveback(ep, &req->request, status); 221 } 222 } 223 224 /* ----------------------------------------------------------------------- */ 225 226 /* Data transfers - pure PIO, pure DMA, or mixed mode */ 227 228 /* 229 * This assumes the separate CPPI engine is responding to DMA requests 230 * from the usb core ... sequenced a bit differently from mentor dma. 231 */ 232 233 static inline int max_ep_writesize(struct musb *musb, struct musb_ep *ep) 234 { 235 if (can_bulk_split(musb, ep->type)) 236 return ep->hw_ep->max_packet_sz_tx; 237 else 238 return ep->packet_sz; 239 } 240 241 /* 242 * An endpoint is transmitting data. This can be called either from 243 * the IRQ routine or from ep.queue() to kickstart a request on an 244 * endpoint. 245 * 246 * Context: controller locked, IRQs blocked, endpoint selected 247 */ 248 static void txstate(struct musb *musb, struct musb_request *req) 249 { 250 u8 epnum = req->epnum; 251 struct musb_ep *musb_ep; 252 void __iomem *epio = musb->endpoints[epnum].regs; 253 struct usb_request *request; 254 u16 fifo_count = 0, csr; 255 int use_dma = 0; 256 257 musb_ep = req->ep; 258 259 /* Check if EP is disabled */ 260 if (!musb_ep->desc) { 261 musb_dbg(musb, "ep:%s disabled - ignore request", 262 musb_ep->end_point.name); 263 return; 264 } 265 266 /* we shouldn't get here while DMA is active ... but we do ... */ 267 if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) { 268 musb_dbg(musb, "dma pending..."); 269 return; 270 } 271 272 /* read TXCSR before */ 273 csr = musb_readw(epio, MUSB_TXCSR); 274 275 request = &req->request; 276 fifo_count = min(max_ep_writesize(musb, musb_ep), 277 (int)(request->length - request->actual)); 278 279 if (csr & MUSB_TXCSR_TXPKTRDY) { 280 musb_dbg(musb, "%s old packet still ready , txcsr %03x", 281 musb_ep->end_point.name, csr); 282 return; 283 } 284 285 if (csr & MUSB_TXCSR_P_SENDSTALL) { 286 musb_dbg(musb, "%s stalling, txcsr %03x", 287 musb_ep->end_point.name, csr); 288 return; 289 } 290 291 musb_dbg(musb, "hw_ep%d, maxpacket %d, fifo count %d, txcsr %03x", 292 epnum, musb_ep->packet_sz, fifo_count, 293 csr); 294 295 #ifndef CONFIG_MUSB_PIO_ONLY 296 if (is_buffer_mapped(req)) { 297 struct dma_controller *c = musb->dma_controller; 298 size_t request_size; 299 300 /* setup DMA, then program endpoint CSR */ 301 request_size = min_t(size_t, request->length - request->actual, 302 musb_ep->dma->max_len); 303 304 use_dma = (request->dma != DMA_ADDR_INVALID && request_size); 305 306 /* MUSB_TXCSR_P_ISO is still set correctly */ 307 308 if (musb_dma_inventra(musb) || musb_dma_ux500(musb)) { 309 if (request_size < musb_ep->packet_sz) 310 musb_ep->dma->desired_mode = 0; 311 else 312 musb_ep->dma->desired_mode = 1; 313 314 use_dma = use_dma && c->channel_program( 315 musb_ep->dma, musb_ep->packet_sz, 316 musb_ep->dma->desired_mode, 317 request->dma + request->actual, request_size); 318 if (use_dma) { 319 if (musb_ep->dma->desired_mode == 0) { 320 /* 321 * We must not clear the DMAMODE bit 322 * before the DMAENAB bit -- and the 323 * latter doesn't always get cleared 324 * before we get here... 325 */ 326 csr &= ~(MUSB_TXCSR_AUTOSET 327 | MUSB_TXCSR_DMAENAB); 328 musb_writew(epio, MUSB_TXCSR, csr 329 | MUSB_TXCSR_P_WZC_BITS); 330 csr &= ~MUSB_TXCSR_DMAMODE; 331 csr |= (MUSB_TXCSR_DMAENAB | 332 MUSB_TXCSR_MODE); 333 /* against programming guide */ 334 } else { 335 csr |= (MUSB_TXCSR_DMAENAB 336 | MUSB_TXCSR_DMAMODE 337 | MUSB_TXCSR_MODE); 338 /* 339 * Enable Autoset according to table 340 * below 341 * bulk_split hb_mult Autoset_Enable 342 * 0 0 Yes(Normal) 343 * 0 >0 No(High BW ISO) 344 * 1 0 Yes(HS bulk) 345 * 1 >0 Yes(FS bulk) 346 */ 347 if (!musb_ep->hb_mult || 348 can_bulk_split(musb, 349 musb_ep->type)) 350 csr |= MUSB_TXCSR_AUTOSET; 351 } 352 csr &= ~MUSB_TXCSR_P_UNDERRUN; 353 354 musb_writew(epio, MUSB_TXCSR, csr); 355 } 356 } 357 358 if (is_cppi_enabled(musb)) { 359 /* program endpoint CSR first, then setup DMA */ 360 csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY); 361 csr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_DMAMODE | 362 MUSB_TXCSR_MODE; 363 musb_writew(epio, MUSB_TXCSR, (MUSB_TXCSR_P_WZC_BITS & 364 ~MUSB_TXCSR_P_UNDERRUN) | csr); 365 366 /* ensure writebuffer is empty */ 367 csr = musb_readw(epio, MUSB_TXCSR); 368 369 /* 370 * NOTE host side sets DMAENAB later than this; both are 371 * OK since the transfer dma glue (between CPPI and 372 * Mentor fifos) just tells CPPI it could start. Data 373 * only moves to the USB TX fifo when both fifos are 374 * ready. 375 */ 376 /* 377 * "mode" is irrelevant here; handle terminating ZLPs 378 * like PIO does, since the hardware RNDIS mode seems 379 * unreliable except for the 380 * last-packet-is-already-short case. 381 */ 382 use_dma = use_dma && c->channel_program( 383 musb_ep->dma, musb_ep->packet_sz, 384 0, 385 request->dma + request->actual, 386 request_size); 387 if (!use_dma) { 388 c->channel_release(musb_ep->dma); 389 musb_ep->dma = NULL; 390 csr &= ~MUSB_TXCSR_DMAENAB; 391 musb_writew(epio, MUSB_TXCSR, csr); 392 /* invariant: prequest->buf is non-null */ 393 } 394 } else if (tusb_dma_omap(musb)) 395 use_dma = use_dma && c->channel_program( 396 musb_ep->dma, musb_ep->packet_sz, 397 request->zero, 398 request->dma + request->actual, 399 request_size); 400 } 401 #endif 402 403 if (!use_dma) { 404 /* 405 * Unmap the dma buffer back to cpu if dma channel 406 * programming fails 407 */ 408 unmap_dma_buffer(req, musb); 409 410 musb_write_fifo(musb_ep->hw_ep, fifo_count, 411 (u8 *) (request->buf + request->actual)); 412 request->actual += fifo_count; 413 csr |= MUSB_TXCSR_TXPKTRDY; 414 csr &= ~MUSB_TXCSR_P_UNDERRUN; 415 musb_writew(epio, MUSB_TXCSR, csr); 416 } 417 418 /* host may already have the data when this message shows... */ 419 musb_dbg(musb, "%s TX/IN %s len %d/%d, txcsr %04x, fifo %d/%d", 420 musb_ep->end_point.name, use_dma ? "dma" : "pio", 421 request->actual, request->length, 422 musb_readw(epio, MUSB_TXCSR), 423 fifo_count, 424 musb_readw(epio, MUSB_TXMAXP)); 425 } 426 427 /* 428 * FIFO state update (e.g. data ready). 429 * Called from IRQ, with controller locked. 430 */ 431 void musb_g_tx(struct musb *musb, u8 epnum) 432 { 433 u16 csr; 434 struct musb_request *req; 435 struct usb_request *request; 436 u8 __iomem *mbase = musb->mregs; 437 struct musb_ep *musb_ep = &musb->endpoints[epnum].ep_in; 438 void __iomem *epio = musb->endpoints[epnum].regs; 439 struct dma_channel *dma; 440 441 musb_ep_select(mbase, epnum); 442 req = next_request(musb_ep); 443 request = &req->request; 444 445 trace_musb_req_tx(req); 446 csr = musb_readw(epio, MUSB_TXCSR); 447 musb_dbg(musb, "<== %s, txcsr %04x", musb_ep->end_point.name, csr); 448 449 dma = is_dma_capable() ? musb_ep->dma : NULL; 450 451 /* 452 * REVISIT: for high bandwidth, MUSB_TXCSR_P_INCOMPTX 453 * probably rates reporting as a host error. 454 */ 455 if (csr & MUSB_TXCSR_P_SENTSTALL) { 456 csr |= MUSB_TXCSR_P_WZC_BITS; 457 csr &= ~MUSB_TXCSR_P_SENTSTALL; 458 musb_writew(epio, MUSB_TXCSR, csr); 459 return; 460 } 461 462 if (csr & MUSB_TXCSR_P_UNDERRUN) { 463 /* We NAKed, no big deal... little reason to care. */ 464 csr |= MUSB_TXCSR_P_WZC_BITS; 465 csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY); 466 musb_writew(epio, MUSB_TXCSR, csr); 467 dev_vdbg(musb->controller, "underrun on ep%d, req %p\n", 468 epnum, request); 469 } 470 471 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 472 /* 473 * SHOULD NOT HAPPEN... has with CPPI though, after 474 * changing SENDSTALL (and other cases); harmless? 475 */ 476 musb_dbg(musb, "%s dma still busy?", musb_ep->end_point.name); 477 return; 478 } 479 480 if (request) { 481 u8 is_dma = 0; 482 bool short_packet = false; 483 484 if (dma && (csr & MUSB_TXCSR_DMAENAB)) { 485 is_dma = 1; 486 csr |= MUSB_TXCSR_P_WZC_BITS; 487 csr &= ~(MUSB_TXCSR_DMAENAB | MUSB_TXCSR_P_UNDERRUN | 488 MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_AUTOSET); 489 musb_writew(epio, MUSB_TXCSR, csr); 490 /* Ensure writebuffer is empty. */ 491 csr = musb_readw(epio, MUSB_TXCSR); 492 request->actual += musb_ep->dma->actual_len; 493 musb_dbg(musb, "TXCSR%d %04x, DMA off, len %zu, req %p", 494 epnum, csr, musb_ep->dma->actual_len, request); 495 } 496 497 /* 498 * First, maybe a terminating short packet. Some DMA 499 * engines might handle this by themselves. 500 */ 501 if ((request->zero && request->length) 502 && (request->length % musb_ep->packet_sz == 0) 503 && (request->actual == request->length)) 504 short_packet = true; 505 506 if ((musb_dma_inventra(musb) || musb_dma_ux500(musb)) && 507 (is_dma && (!dma->desired_mode || 508 (request->actual & 509 (musb_ep->packet_sz - 1))))) 510 short_packet = true; 511 512 if (short_packet) { 513 /* 514 * On DMA completion, FIFO may not be 515 * available yet... 516 */ 517 if (csr & MUSB_TXCSR_TXPKTRDY) 518 return; 519 520 musb_writew(epio, MUSB_TXCSR, MUSB_TXCSR_MODE 521 | MUSB_TXCSR_TXPKTRDY); 522 request->zero = 0; 523 } 524 525 if (request->actual == request->length) { 526 musb_g_giveback(musb_ep, request, 0); 527 /* 528 * In the giveback function the MUSB lock is 529 * released and acquired after sometime. During 530 * this time period the INDEX register could get 531 * changed by the gadget_queue function especially 532 * on SMP systems. Reselect the INDEX to be sure 533 * we are reading/modifying the right registers 534 */ 535 musb_ep_select(mbase, epnum); 536 req = musb_ep->desc ? next_request(musb_ep) : NULL; 537 if (!req) { 538 musb_dbg(musb, "%s idle now", 539 musb_ep->end_point.name); 540 return; 541 } 542 } 543 544 txstate(musb, req); 545 } 546 } 547 548 /* ------------------------------------------------------------ */ 549 550 /* 551 * Context: controller locked, IRQs blocked, endpoint selected 552 */ 553 static void rxstate(struct musb *musb, struct musb_request *req) 554 { 555 const u8 epnum = req->epnum; 556 struct usb_request *request = &req->request; 557 struct musb_ep *musb_ep; 558 void __iomem *epio = musb->endpoints[epnum].regs; 559 unsigned len = 0; 560 u16 fifo_count; 561 u16 csr = musb_readw(epio, MUSB_RXCSR); 562 struct musb_hw_ep *hw_ep = &musb->endpoints[epnum]; 563 u8 use_mode_1; 564 565 if (hw_ep->is_shared_fifo) 566 musb_ep = &hw_ep->ep_in; 567 else 568 musb_ep = &hw_ep->ep_out; 569 570 fifo_count = musb_ep->packet_sz; 571 572 /* Check if EP is disabled */ 573 if (!musb_ep->desc) { 574 musb_dbg(musb, "ep:%s disabled - ignore request", 575 musb_ep->end_point.name); 576 return; 577 } 578 579 /* We shouldn't get here while DMA is active, but we do... */ 580 if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) { 581 musb_dbg(musb, "DMA pending..."); 582 return; 583 } 584 585 if (csr & MUSB_RXCSR_P_SENDSTALL) { 586 musb_dbg(musb, "%s stalling, RXCSR %04x", 587 musb_ep->end_point.name, csr); 588 return; 589 } 590 591 if (is_cppi_enabled(musb) && is_buffer_mapped(req)) { 592 struct dma_controller *c = musb->dma_controller; 593 struct dma_channel *channel = musb_ep->dma; 594 595 /* NOTE: CPPI won't actually stop advancing the DMA 596 * queue after short packet transfers, so this is almost 597 * always going to run as IRQ-per-packet DMA so that 598 * faults will be handled correctly. 599 */ 600 if (c->channel_program(channel, 601 musb_ep->packet_sz, 602 !request->short_not_ok, 603 request->dma + request->actual, 604 request->length - request->actual)) { 605 606 /* make sure that if an rxpkt arrived after the irq, 607 * the cppi engine will be ready to take it as soon 608 * as DMA is enabled 609 */ 610 csr &= ~(MUSB_RXCSR_AUTOCLEAR 611 | MUSB_RXCSR_DMAMODE); 612 csr |= MUSB_RXCSR_DMAENAB | MUSB_RXCSR_P_WZC_BITS; 613 musb_writew(epio, MUSB_RXCSR, csr); 614 return; 615 } 616 } 617 618 if (csr & MUSB_RXCSR_RXPKTRDY) { 619 fifo_count = musb_readw(epio, MUSB_RXCOUNT); 620 621 /* 622 * Enable Mode 1 on RX transfers only when short_not_ok flag 623 * is set. Currently short_not_ok flag is set only from 624 * file_storage and f_mass_storage drivers 625 */ 626 627 if (request->short_not_ok && fifo_count == musb_ep->packet_sz) 628 use_mode_1 = 1; 629 else 630 use_mode_1 = 0; 631 632 if (request->actual < request->length) { 633 if (!is_buffer_mapped(req)) 634 goto buffer_aint_mapped; 635 636 if (musb_dma_inventra(musb)) { 637 struct dma_controller *c; 638 struct dma_channel *channel; 639 int use_dma = 0; 640 unsigned int transfer_size; 641 642 c = musb->dma_controller; 643 channel = musb_ep->dma; 644 645 /* We use DMA Req mode 0 in rx_csr, and DMA controller operates in 646 * mode 0 only. So we do not get endpoint interrupts due to DMA 647 * completion. We only get interrupts from DMA controller. 648 * 649 * We could operate in DMA mode 1 if we knew the size of the tranfer 650 * in advance. For mass storage class, request->length = what the host 651 * sends, so that'd work. But for pretty much everything else, 652 * request->length is routinely more than what the host sends. For 653 * most these gadgets, end of is signified either by a short packet, 654 * or filling the last byte of the buffer. (Sending extra data in 655 * that last pckate should trigger an overflow fault.) But in mode 1, 656 * we don't get DMA completion interrupt for short packets. 657 * 658 * Theoretically, we could enable DMAReq irq (MUSB_RXCSR_DMAMODE = 1), 659 * to get endpoint interrupt on every DMA req, but that didn't seem 660 * to work reliably. 661 * 662 * REVISIT an updated g_file_storage can set req->short_not_ok, which 663 * then becomes usable as a runtime "use mode 1" hint... 664 */ 665 666 /* Experimental: Mode1 works with mass storage use cases */ 667 if (use_mode_1) { 668 csr |= MUSB_RXCSR_AUTOCLEAR; 669 musb_writew(epio, MUSB_RXCSR, csr); 670 csr |= MUSB_RXCSR_DMAENAB; 671 musb_writew(epio, MUSB_RXCSR, csr); 672 673 /* 674 * this special sequence (enabling and then 675 * disabling MUSB_RXCSR_DMAMODE) is required 676 * to get DMAReq to activate 677 */ 678 musb_writew(epio, MUSB_RXCSR, 679 csr | MUSB_RXCSR_DMAMODE); 680 musb_writew(epio, MUSB_RXCSR, csr); 681 682 transfer_size = min_t(unsigned int, 683 request->length - 684 request->actual, 685 channel->max_len); 686 musb_ep->dma->desired_mode = 1; 687 } else { 688 if (!musb_ep->hb_mult && 689 musb_ep->hw_ep->rx_double_buffered) 690 csr |= MUSB_RXCSR_AUTOCLEAR; 691 csr |= MUSB_RXCSR_DMAENAB; 692 musb_writew(epio, MUSB_RXCSR, csr); 693 694 transfer_size = min(request->length - request->actual, 695 (unsigned)fifo_count); 696 musb_ep->dma->desired_mode = 0; 697 } 698 699 use_dma = c->channel_program( 700 channel, 701 musb_ep->packet_sz, 702 channel->desired_mode, 703 request->dma 704 + request->actual, 705 transfer_size); 706 707 if (use_dma) 708 return; 709 } 710 711 if ((musb_dma_ux500(musb)) && 712 (request->actual < request->length)) { 713 714 struct dma_controller *c; 715 struct dma_channel *channel; 716 unsigned int transfer_size = 0; 717 718 c = musb->dma_controller; 719 channel = musb_ep->dma; 720 721 /* In case first packet is short */ 722 if (fifo_count < musb_ep->packet_sz) 723 transfer_size = fifo_count; 724 else if (request->short_not_ok) 725 transfer_size = min_t(unsigned int, 726 request->length - 727 request->actual, 728 channel->max_len); 729 else 730 transfer_size = min_t(unsigned int, 731 request->length - 732 request->actual, 733 (unsigned)fifo_count); 734 735 csr &= ~MUSB_RXCSR_DMAMODE; 736 csr |= (MUSB_RXCSR_DMAENAB | 737 MUSB_RXCSR_AUTOCLEAR); 738 739 musb_writew(epio, MUSB_RXCSR, csr); 740 741 if (transfer_size <= musb_ep->packet_sz) { 742 musb_ep->dma->desired_mode = 0; 743 } else { 744 musb_ep->dma->desired_mode = 1; 745 /* Mode must be set after DMAENAB */ 746 csr |= MUSB_RXCSR_DMAMODE; 747 musb_writew(epio, MUSB_RXCSR, csr); 748 } 749 750 if (c->channel_program(channel, 751 musb_ep->packet_sz, 752 channel->desired_mode, 753 request->dma 754 + request->actual, 755 transfer_size)) 756 757 return; 758 } 759 760 len = request->length - request->actual; 761 musb_dbg(musb, "%s OUT/RX pio fifo %d/%d, maxpacket %d", 762 musb_ep->end_point.name, 763 fifo_count, len, 764 musb_ep->packet_sz); 765 766 fifo_count = min_t(unsigned, len, fifo_count); 767 768 if (tusb_dma_omap(musb)) { 769 struct dma_controller *c = musb->dma_controller; 770 struct dma_channel *channel = musb_ep->dma; 771 u32 dma_addr = request->dma + request->actual; 772 int ret; 773 774 ret = c->channel_program(channel, 775 musb_ep->packet_sz, 776 channel->desired_mode, 777 dma_addr, 778 fifo_count); 779 if (ret) 780 return; 781 } 782 783 /* 784 * Unmap the dma buffer back to cpu if dma channel 785 * programming fails. This buffer is mapped if the 786 * channel allocation is successful 787 */ 788 unmap_dma_buffer(req, musb); 789 790 /* 791 * Clear DMAENAB and AUTOCLEAR for the 792 * PIO mode transfer 793 */ 794 csr &= ~(MUSB_RXCSR_DMAENAB | MUSB_RXCSR_AUTOCLEAR); 795 musb_writew(epio, MUSB_RXCSR, csr); 796 797 buffer_aint_mapped: 798 musb_read_fifo(musb_ep->hw_ep, fifo_count, (u8 *) 799 (request->buf + request->actual)); 800 request->actual += fifo_count; 801 802 /* REVISIT if we left anything in the fifo, flush 803 * it and report -EOVERFLOW 804 */ 805 806 /* ack the read! */ 807 csr |= MUSB_RXCSR_P_WZC_BITS; 808 csr &= ~MUSB_RXCSR_RXPKTRDY; 809 musb_writew(epio, MUSB_RXCSR, csr); 810 } 811 } 812 813 /* reach the end or short packet detected */ 814 if (request->actual == request->length || 815 fifo_count < musb_ep->packet_sz) 816 musb_g_giveback(musb_ep, request, 0); 817 } 818 819 /* 820 * Data ready for a request; called from IRQ 821 */ 822 void musb_g_rx(struct musb *musb, u8 epnum) 823 { 824 u16 csr; 825 struct musb_request *req; 826 struct usb_request *request; 827 void __iomem *mbase = musb->mregs; 828 struct musb_ep *musb_ep; 829 void __iomem *epio = musb->endpoints[epnum].regs; 830 struct dma_channel *dma; 831 struct musb_hw_ep *hw_ep = &musb->endpoints[epnum]; 832 833 if (hw_ep->is_shared_fifo) 834 musb_ep = &hw_ep->ep_in; 835 else 836 musb_ep = &hw_ep->ep_out; 837 838 musb_ep_select(mbase, epnum); 839 840 req = next_request(musb_ep); 841 if (!req) 842 return; 843 844 trace_musb_req_rx(req); 845 request = &req->request; 846 847 csr = musb_readw(epio, MUSB_RXCSR); 848 dma = is_dma_capable() ? musb_ep->dma : NULL; 849 850 musb_dbg(musb, "<== %s, rxcsr %04x%s %p", musb_ep->end_point.name, 851 csr, dma ? " (dma)" : "", request); 852 853 if (csr & MUSB_RXCSR_P_SENTSTALL) { 854 csr |= MUSB_RXCSR_P_WZC_BITS; 855 csr &= ~MUSB_RXCSR_P_SENTSTALL; 856 musb_writew(epio, MUSB_RXCSR, csr); 857 return; 858 } 859 860 if (csr & MUSB_RXCSR_P_OVERRUN) { 861 /* csr |= MUSB_RXCSR_P_WZC_BITS; */ 862 csr &= ~MUSB_RXCSR_P_OVERRUN; 863 musb_writew(epio, MUSB_RXCSR, csr); 864 865 musb_dbg(musb, "%s iso overrun on %p", musb_ep->name, request); 866 if (request->status == -EINPROGRESS) 867 request->status = -EOVERFLOW; 868 } 869 if (csr & MUSB_RXCSR_INCOMPRX) { 870 /* REVISIT not necessarily an error */ 871 musb_dbg(musb, "%s, incomprx", musb_ep->end_point.name); 872 } 873 874 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 875 /* "should not happen"; likely RXPKTRDY pending for DMA */ 876 musb_dbg(musb, "%s busy, csr %04x", 877 musb_ep->end_point.name, csr); 878 return; 879 } 880 881 if (dma && (csr & MUSB_RXCSR_DMAENAB)) { 882 csr &= ~(MUSB_RXCSR_AUTOCLEAR 883 | MUSB_RXCSR_DMAENAB 884 | MUSB_RXCSR_DMAMODE); 885 musb_writew(epio, MUSB_RXCSR, 886 MUSB_RXCSR_P_WZC_BITS | csr); 887 888 request->actual += musb_ep->dma->actual_len; 889 890 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \ 891 defined(CONFIG_USB_UX500_DMA) 892 /* Autoclear doesn't clear RxPktRdy for short packets */ 893 if ((dma->desired_mode == 0 && !hw_ep->rx_double_buffered) 894 || (dma->actual_len 895 & (musb_ep->packet_sz - 1))) { 896 /* ack the read! */ 897 csr &= ~MUSB_RXCSR_RXPKTRDY; 898 musb_writew(epio, MUSB_RXCSR, csr); 899 } 900 901 /* incomplete, and not short? wait for next IN packet */ 902 if ((request->actual < request->length) 903 && (musb_ep->dma->actual_len 904 == musb_ep->packet_sz)) { 905 /* In double buffer case, continue to unload fifo if 906 * there is Rx packet in FIFO. 907 **/ 908 csr = musb_readw(epio, MUSB_RXCSR); 909 if ((csr & MUSB_RXCSR_RXPKTRDY) && 910 hw_ep->rx_double_buffered) 911 goto exit; 912 return; 913 } 914 #endif 915 musb_g_giveback(musb_ep, request, 0); 916 /* 917 * In the giveback function the MUSB lock is 918 * released and acquired after sometime. During 919 * this time period the INDEX register could get 920 * changed by the gadget_queue function especially 921 * on SMP systems. Reselect the INDEX to be sure 922 * we are reading/modifying the right registers 923 */ 924 musb_ep_select(mbase, epnum); 925 926 req = next_request(musb_ep); 927 if (!req) 928 return; 929 } 930 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \ 931 defined(CONFIG_USB_UX500_DMA) 932 exit: 933 #endif 934 /* Analyze request */ 935 rxstate(musb, req); 936 } 937 938 /* ------------------------------------------------------------ */ 939 940 static int musb_gadget_enable(struct usb_ep *ep, 941 const struct usb_endpoint_descriptor *desc) 942 { 943 unsigned long flags; 944 struct musb_ep *musb_ep; 945 struct musb_hw_ep *hw_ep; 946 void __iomem *regs; 947 struct musb *musb; 948 void __iomem *mbase; 949 u8 epnum; 950 u16 csr; 951 unsigned tmp; 952 int status = -EINVAL; 953 954 if (!ep || !desc) 955 return -EINVAL; 956 957 musb_ep = to_musb_ep(ep); 958 hw_ep = musb_ep->hw_ep; 959 regs = hw_ep->regs; 960 musb = musb_ep->musb; 961 mbase = musb->mregs; 962 epnum = musb_ep->current_epnum; 963 964 spin_lock_irqsave(&musb->lock, flags); 965 966 if (musb_ep->desc) { 967 status = -EBUSY; 968 goto fail; 969 } 970 musb_ep->type = usb_endpoint_type(desc); 971 972 /* check direction and (later) maxpacket size against endpoint */ 973 if (usb_endpoint_num(desc) != epnum) 974 goto fail; 975 976 /* REVISIT this rules out high bandwidth periodic transfers */ 977 tmp = usb_endpoint_maxp(desc); 978 if (tmp & ~0x07ff) { 979 int ok; 980 981 if (usb_endpoint_dir_in(desc)) 982 ok = musb->hb_iso_tx; 983 else 984 ok = musb->hb_iso_rx; 985 986 if (!ok) { 987 musb_dbg(musb, "no support for high bandwidth ISO"); 988 goto fail; 989 } 990 musb_ep->hb_mult = (tmp >> 11) & 3; 991 } else { 992 musb_ep->hb_mult = 0; 993 } 994 995 musb_ep->packet_sz = tmp & 0x7ff; 996 tmp = musb_ep->packet_sz * (musb_ep->hb_mult + 1); 997 998 /* enable the interrupts for the endpoint, set the endpoint 999 * packet size (or fail), set the mode, clear the fifo 1000 */ 1001 musb_ep_select(mbase, epnum); 1002 if (usb_endpoint_dir_in(desc)) { 1003 1004 if (hw_ep->is_shared_fifo) 1005 musb_ep->is_in = 1; 1006 if (!musb_ep->is_in) 1007 goto fail; 1008 1009 if (tmp > hw_ep->max_packet_sz_tx) { 1010 musb_dbg(musb, "packet size beyond hardware FIFO size"); 1011 goto fail; 1012 } 1013 1014 musb->intrtxe |= (1 << epnum); 1015 musb_writew(mbase, MUSB_INTRTXE, musb->intrtxe); 1016 1017 /* REVISIT if can_bulk_split(), use by updating "tmp"; 1018 * likewise high bandwidth periodic tx 1019 */ 1020 /* Set TXMAXP with the FIFO size of the endpoint 1021 * to disable double buffering mode. 1022 */ 1023 if (musb->double_buffer_not_ok) { 1024 musb_writew(regs, MUSB_TXMAXP, hw_ep->max_packet_sz_tx); 1025 } else { 1026 if (can_bulk_split(musb, musb_ep->type)) 1027 musb_ep->hb_mult = (hw_ep->max_packet_sz_tx / 1028 musb_ep->packet_sz) - 1; 1029 musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz 1030 | (musb_ep->hb_mult << 11)); 1031 } 1032 1033 csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG; 1034 if (musb_readw(regs, MUSB_TXCSR) 1035 & MUSB_TXCSR_FIFONOTEMPTY) 1036 csr |= MUSB_TXCSR_FLUSHFIFO; 1037 if (musb_ep->type == USB_ENDPOINT_XFER_ISOC) 1038 csr |= MUSB_TXCSR_P_ISO; 1039 1040 /* set twice in case of double buffering */ 1041 musb_writew(regs, MUSB_TXCSR, csr); 1042 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */ 1043 musb_writew(regs, MUSB_TXCSR, csr); 1044 1045 } else { 1046 1047 if (hw_ep->is_shared_fifo) 1048 musb_ep->is_in = 0; 1049 if (musb_ep->is_in) 1050 goto fail; 1051 1052 if (tmp > hw_ep->max_packet_sz_rx) { 1053 musb_dbg(musb, "packet size beyond hardware FIFO size"); 1054 goto fail; 1055 } 1056 1057 musb->intrrxe |= (1 << epnum); 1058 musb_writew(mbase, MUSB_INTRRXE, musb->intrrxe); 1059 1060 /* REVISIT if can_bulk_combine() use by updating "tmp" 1061 * likewise high bandwidth periodic rx 1062 */ 1063 /* Set RXMAXP with the FIFO size of the endpoint 1064 * to disable double buffering mode. 1065 */ 1066 if (musb->double_buffer_not_ok) 1067 musb_writew(regs, MUSB_RXMAXP, hw_ep->max_packet_sz_tx); 1068 else 1069 musb_writew(regs, MUSB_RXMAXP, musb_ep->packet_sz 1070 | (musb_ep->hb_mult << 11)); 1071 1072 /* force shared fifo to OUT-only mode */ 1073 if (hw_ep->is_shared_fifo) { 1074 csr = musb_readw(regs, MUSB_TXCSR); 1075 csr &= ~(MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY); 1076 musb_writew(regs, MUSB_TXCSR, csr); 1077 } 1078 1079 csr = MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_CLRDATATOG; 1080 if (musb_ep->type == USB_ENDPOINT_XFER_ISOC) 1081 csr |= MUSB_RXCSR_P_ISO; 1082 else if (musb_ep->type == USB_ENDPOINT_XFER_INT) 1083 csr |= MUSB_RXCSR_DISNYET; 1084 1085 /* set twice in case of double buffering */ 1086 musb_writew(regs, MUSB_RXCSR, csr); 1087 musb_writew(regs, MUSB_RXCSR, csr); 1088 } 1089 1090 /* NOTE: all the I/O code _should_ work fine without DMA, in case 1091 * for some reason you run out of channels here. 1092 */ 1093 if (is_dma_capable() && musb->dma_controller) { 1094 struct dma_controller *c = musb->dma_controller; 1095 1096 musb_ep->dma = c->channel_alloc(c, hw_ep, 1097 (desc->bEndpointAddress & USB_DIR_IN)); 1098 } else 1099 musb_ep->dma = NULL; 1100 1101 musb_ep->desc = desc; 1102 musb_ep->busy = 0; 1103 musb_ep->wedged = 0; 1104 status = 0; 1105 1106 pr_debug("%s periph: enabled %s for %s %s, %smaxpacket %d\n", 1107 musb_driver_name, musb_ep->end_point.name, 1108 ({ char *s; switch (musb_ep->type) { 1109 case USB_ENDPOINT_XFER_BULK: s = "bulk"; break; 1110 case USB_ENDPOINT_XFER_INT: s = "int"; break; 1111 default: s = "iso"; break; 1112 } s; }), 1113 musb_ep->is_in ? "IN" : "OUT", 1114 musb_ep->dma ? "dma, " : "", 1115 musb_ep->packet_sz); 1116 1117 schedule_work(&musb->irq_work); 1118 1119 fail: 1120 spin_unlock_irqrestore(&musb->lock, flags); 1121 return status; 1122 } 1123 1124 /* 1125 * Disable an endpoint flushing all requests queued. 1126 */ 1127 static int musb_gadget_disable(struct usb_ep *ep) 1128 { 1129 unsigned long flags; 1130 struct musb *musb; 1131 u8 epnum; 1132 struct musb_ep *musb_ep; 1133 void __iomem *epio; 1134 int status = 0; 1135 1136 musb_ep = to_musb_ep(ep); 1137 musb = musb_ep->musb; 1138 epnum = musb_ep->current_epnum; 1139 epio = musb->endpoints[epnum].regs; 1140 1141 spin_lock_irqsave(&musb->lock, flags); 1142 musb_ep_select(musb->mregs, epnum); 1143 1144 /* zero the endpoint sizes */ 1145 if (musb_ep->is_in) { 1146 musb->intrtxe &= ~(1 << epnum); 1147 musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe); 1148 musb_writew(epio, MUSB_TXMAXP, 0); 1149 } else { 1150 musb->intrrxe &= ~(1 << epnum); 1151 musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe); 1152 musb_writew(epio, MUSB_RXMAXP, 0); 1153 } 1154 1155 /* abort all pending DMA and requests */ 1156 nuke(musb_ep, -ESHUTDOWN); 1157 1158 musb_ep->desc = NULL; 1159 musb_ep->end_point.desc = NULL; 1160 1161 schedule_work(&musb->irq_work); 1162 1163 spin_unlock_irqrestore(&(musb->lock), flags); 1164 1165 musb_dbg(musb, "%s", musb_ep->end_point.name); 1166 1167 return status; 1168 } 1169 1170 /* 1171 * Allocate a request for an endpoint. 1172 * Reused by ep0 code. 1173 */ 1174 struct usb_request *musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags) 1175 { 1176 struct musb_ep *musb_ep = to_musb_ep(ep); 1177 struct musb_request *request = NULL; 1178 1179 request = kzalloc(sizeof *request, gfp_flags); 1180 if (!request) 1181 return NULL; 1182 1183 request->request.dma = DMA_ADDR_INVALID; 1184 request->epnum = musb_ep->current_epnum; 1185 request->ep = musb_ep; 1186 1187 trace_musb_req_alloc(request); 1188 return &request->request; 1189 } 1190 1191 /* 1192 * Free a request 1193 * Reused by ep0 code. 1194 */ 1195 void musb_free_request(struct usb_ep *ep, struct usb_request *req) 1196 { 1197 struct musb_request *request = to_musb_request(req); 1198 1199 trace_musb_req_free(request); 1200 kfree(request); 1201 } 1202 1203 static LIST_HEAD(buffers); 1204 1205 struct free_record { 1206 struct list_head list; 1207 struct device *dev; 1208 unsigned bytes; 1209 dma_addr_t dma; 1210 }; 1211 1212 /* 1213 * Context: controller locked, IRQs blocked. 1214 */ 1215 void musb_ep_restart(struct musb *musb, struct musb_request *req) 1216 { 1217 trace_musb_req_start(req); 1218 musb_ep_select(musb->mregs, req->epnum); 1219 if (req->tx) 1220 txstate(musb, req); 1221 else 1222 rxstate(musb, req); 1223 } 1224 1225 static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req, 1226 gfp_t gfp_flags) 1227 { 1228 struct musb_ep *musb_ep; 1229 struct musb_request *request; 1230 struct musb *musb; 1231 int status = 0; 1232 unsigned long lockflags; 1233 1234 if (!ep || !req) 1235 return -EINVAL; 1236 if (!req->buf) 1237 return -ENODATA; 1238 1239 musb_ep = to_musb_ep(ep); 1240 musb = musb_ep->musb; 1241 1242 request = to_musb_request(req); 1243 request->musb = musb; 1244 1245 if (request->ep != musb_ep) 1246 return -EINVAL; 1247 1248 trace_musb_req_enq(request); 1249 1250 /* request is mine now... */ 1251 request->request.actual = 0; 1252 request->request.status = -EINPROGRESS; 1253 request->epnum = musb_ep->current_epnum; 1254 request->tx = musb_ep->is_in; 1255 1256 map_dma_buffer(request, musb, musb_ep); 1257 1258 spin_lock_irqsave(&musb->lock, lockflags); 1259 1260 /* don't queue if the ep is down */ 1261 if (!musb_ep->desc) { 1262 musb_dbg(musb, "req %p queued to %s while ep %s", 1263 req, ep->name, "disabled"); 1264 status = -ESHUTDOWN; 1265 unmap_dma_buffer(request, musb); 1266 goto unlock; 1267 } 1268 1269 /* add request to the list */ 1270 list_add_tail(&request->list, &musb_ep->req_list); 1271 1272 /* it this is the head of the queue, start i/o ... */ 1273 if (!musb_ep->busy && &request->list == musb_ep->req_list.next) 1274 musb_ep_restart(musb, request); 1275 1276 unlock: 1277 spin_unlock_irqrestore(&musb->lock, lockflags); 1278 return status; 1279 } 1280 1281 static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request *request) 1282 { 1283 struct musb_ep *musb_ep = to_musb_ep(ep); 1284 struct musb_request *req = to_musb_request(request); 1285 struct musb_request *r; 1286 unsigned long flags; 1287 int status = 0; 1288 struct musb *musb = musb_ep->musb; 1289 1290 if (!ep || !request || req->ep != musb_ep) 1291 return -EINVAL; 1292 1293 trace_musb_req_deq(req); 1294 1295 spin_lock_irqsave(&musb->lock, flags); 1296 1297 list_for_each_entry(r, &musb_ep->req_list, list) { 1298 if (r == req) 1299 break; 1300 } 1301 if (r != req) { 1302 dev_err(musb->controller, "request %p not queued to %s\n", 1303 request, ep->name); 1304 status = -EINVAL; 1305 goto done; 1306 } 1307 1308 /* if the hardware doesn't have the request, easy ... */ 1309 if (musb_ep->req_list.next != &req->list || musb_ep->busy) 1310 musb_g_giveback(musb_ep, request, -ECONNRESET); 1311 1312 /* ... else abort the dma transfer ... */ 1313 else if (is_dma_capable() && musb_ep->dma) { 1314 struct dma_controller *c = musb->dma_controller; 1315 1316 musb_ep_select(musb->mregs, musb_ep->current_epnum); 1317 if (c->channel_abort) 1318 status = c->channel_abort(musb_ep->dma); 1319 else 1320 status = -EBUSY; 1321 if (status == 0) 1322 musb_g_giveback(musb_ep, request, -ECONNRESET); 1323 } else { 1324 /* NOTE: by sticking to easily tested hardware/driver states, 1325 * we leave counting of in-flight packets imprecise. 1326 */ 1327 musb_g_giveback(musb_ep, request, -ECONNRESET); 1328 } 1329 1330 done: 1331 spin_unlock_irqrestore(&musb->lock, flags); 1332 return status; 1333 } 1334 1335 /* 1336 * Set or clear the halt bit of an endpoint. A halted enpoint won't tx/rx any 1337 * data but will queue requests. 1338 * 1339 * exported to ep0 code 1340 */ 1341 static int musb_gadget_set_halt(struct usb_ep *ep, int value) 1342 { 1343 struct musb_ep *musb_ep = to_musb_ep(ep); 1344 u8 epnum = musb_ep->current_epnum; 1345 struct musb *musb = musb_ep->musb; 1346 void __iomem *epio = musb->endpoints[epnum].regs; 1347 void __iomem *mbase; 1348 unsigned long flags; 1349 u16 csr; 1350 struct musb_request *request; 1351 int status = 0; 1352 1353 if (!ep) 1354 return -EINVAL; 1355 mbase = musb->mregs; 1356 1357 spin_lock_irqsave(&musb->lock, flags); 1358 1359 if ((USB_ENDPOINT_XFER_ISOC == musb_ep->type)) { 1360 status = -EINVAL; 1361 goto done; 1362 } 1363 1364 musb_ep_select(mbase, epnum); 1365 1366 request = next_request(musb_ep); 1367 if (value) { 1368 if (request) { 1369 musb_dbg(musb, "request in progress, cannot halt %s", 1370 ep->name); 1371 status = -EAGAIN; 1372 goto done; 1373 } 1374 /* Cannot portably stall with non-empty FIFO */ 1375 if (musb_ep->is_in) { 1376 csr = musb_readw(epio, MUSB_TXCSR); 1377 if (csr & MUSB_TXCSR_FIFONOTEMPTY) { 1378 musb_dbg(musb, "FIFO busy, cannot halt %s", 1379 ep->name); 1380 status = -EAGAIN; 1381 goto done; 1382 } 1383 } 1384 } else 1385 musb_ep->wedged = 0; 1386 1387 /* set/clear the stall and toggle bits */ 1388 musb_dbg(musb, "%s: %s stall", ep->name, value ? "set" : "clear"); 1389 if (musb_ep->is_in) { 1390 csr = musb_readw(epio, MUSB_TXCSR); 1391 csr |= MUSB_TXCSR_P_WZC_BITS 1392 | MUSB_TXCSR_CLRDATATOG; 1393 if (value) 1394 csr |= MUSB_TXCSR_P_SENDSTALL; 1395 else 1396 csr &= ~(MUSB_TXCSR_P_SENDSTALL 1397 | MUSB_TXCSR_P_SENTSTALL); 1398 csr &= ~MUSB_TXCSR_TXPKTRDY; 1399 musb_writew(epio, MUSB_TXCSR, csr); 1400 } else { 1401 csr = musb_readw(epio, MUSB_RXCSR); 1402 csr |= MUSB_RXCSR_P_WZC_BITS 1403 | MUSB_RXCSR_FLUSHFIFO 1404 | MUSB_RXCSR_CLRDATATOG; 1405 if (value) 1406 csr |= MUSB_RXCSR_P_SENDSTALL; 1407 else 1408 csr &= ~(MUSB_RXCSR_P_SENDSTALL 1409 | MUSB_RXCSR_P_SENTSTALL); 1410 musb_writew(epio, MUSB_RXCSR, csr); 1411 } 1412 1413 /* maybe start the first request in the queue */ 1414 if (!musb_ep->busy && !value && request) { 1415 musb_dbg(musb, "restarting the request"); 1416 musb_ep_restart(musb, request); 1417 } 1418 1419 done: 1420 spin_unlock_irqrestore(&musb->lock, flags); 1421 return status; 1422 } 1423 1424 /* 1425 * Sets the halt feature with the clear requests ignored 1426 */ 1427 static int musb_gadget_set_wedge(struct usb_ep *ep) 1428 { 1429 struct musb_ep *musb_ep = to_musb_ep(ep); 1430 1431 if (!ep) 1432 return -EINVAL; 1433 1434 musb_ep->wedged = 1; 1435 1436 return usb_ep_set_halt(ep); 1437 } 1438 1439 static int musb_gadget_fifo_status(struct usb_ep *ep) 1440 { 1441 struct musb_ep *musb_ep = to_musb_ep(ep); 1442 void __iomem *epio = musb_ep->hw_ep->regs; 1443 int retval = -EINVAL; 1444 1445 if (musb_ep->desc && !musb_ep->is_in) { 1446 struct musb *musb = musb_ep->musb; 1447 int epnum = musb_ep->current_epnum; 1448 void __iomem *mbase = musb->mregs; 1449 unsigned long flags; 1450 1451 spin_lock_irqsave(&musb->lock, flags); 1452 1453 musb_ep_select(mbase, epnum); 1454 /* FIXME return zero unless RXPKTRDY is set */ 1455 retval = musb_readw(epio, MUSB_RXCOUNT); 1456 1457 spin_unlock_irqrestore(&musb->lock, flags); 1458 } 1459 return retval; 1460 } 1461 1462 static void musb_gadget_fifo_flush(struct usb_ep *ep) 1463 { 1464 struct musb_ep *musb_ep = to_musb_ep(ep); 1465 struct musb *musb = musb_ep->musb; 1466 u8 epnum = musb_ep->current_epnum; 1467 void __iomem *epio = musb->endpoints[epnum].regs; 1468 void __iomem *mbase; 1469 unsigned long flags; 1470 u16 csr; 1471 1472 mbase = musb->mregs; 1473 1474 spin_lock_irqsave(&musb->lock, flags); 1475 musb_ep_select(mbase, (u8) epnum); 1476 1477 /* disable interrupts */ 1478 musb_writew(mbase, MUSB_INTRTXE, musb->intrtxe & ~(1 << epnum)); 1479 1480 if (musb_ep->is_in) { 1481 csr = musb_readw(epio, MUSB_TXCSR); 1482 if (csr & MUSB_TXCSR_FIFONOTEMPTY) { 1483 csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_P_WZC_BITS; 1484 /* 1485 * Setting both TXPKTRDY and FLUSHFIFO makes controller 1486 * to interrupt current FIFO loading, but not flushing 1487 * the already loaded ones. 1488 */ 1489 csr &= ~MUSB_TXCSR_TXPKTRDY; 1490 musb_writew(epio, MUSB_TXCSR, csr); 1491 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */ 1492 musb_writew(epio, MUSB_TXCSR, csr); 1493 } 1494 } else { 1495 csr = musb_readw(epio, MUSB_RXCSR); 1496 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_P_WZC_BITS; 1497 musb_writew(epio, MUSB_RXCSR, csr); 1498 musb_writew(epio, MUSB_RXCSR, csr); 1499 } 1500 1501 /* re-enable interrupt */ 1502 musb_writew(mbase, MUSB_INTRTXE, musb->intrtxe); 1503 spin_unlock_irqrestore(&musb->lock, flags); 1504 } 1505 1506 static const struct usb_ep_ops musb_ep_ops = { 1507 .enable = musb_gadget_enable, 1508 .disable = musb_gadget_disable, 1509 .alloc_request = musb_alloc_request, 1510 .free_request = musb_free_request, 1511 .queue = musb_gadget_queue, 1512 .dequeue = musb_gadget_dequeue, 1513 .set_halt = musb_gadget_set_halt, 1514 .set_wedge = musb_gadget_set_wedge, 1515 .fifo_status = musb_gadget_fifo_status, 1516 .fifo_flush = musb_gadget_fifo_flush 1517 }; 1518 1519 /* ----------------------------------------------------------------------- */ 1520 1521 static int musb_gadget_get_frame(struct usb_gadget *gadget) 1522 { 1523 struct musb *musb = gadget_to_musb(gadget); 1524 1525 return (int)musb_readw(musb->mregs, MUSB_FRAME); 1526 } 1527 1528 static int musb_gadget_wakeup(struct usb_gadget *gadget) 1529 { 1530 struct musb *musb = gadget_to_musb(gadget); 1531 void __iomem *mregs = musb->mregs; 1532 unsigned long flags; 1533 int status = -EINVAL; 1534 u8 power, devctl; 1535 int retries; 1536 1537 spin_lock_irqsave(&musb->lock, flags); 1538 1539 switch (musb->xceiv->otg->state) { 1540 case OTG_STATE_B_PERIPHERAL: 1541 /* NOTE: OTG state machine doesn't include B_SUSPENDED; 1542 * that's part of the standard usb 1.1 state machine, and 1543 * doesn't affect OTG transitions. 1544 */ 1545 if (musb->may_wakeup && musb->is_suspended) 1546 break; 1547 goto done; 1548 case OTG_STATE_B_IDLE: 1549 /* Start SRP ... OTG not required. */ 1550 devctl = musb_readb(mregs, MUSB_DEVCTL); 1551 musb_dbg(musb, "Sending SRP: devctl: %02x", devctl); 1552 devctl |= MUSB_DEVCTL_SESSION; 1553 musb_writeb(mregs, MUSB_DEVCTL, devctl); 1554 devctl = musb_readb(mregs, MUSB_DEVCTL); 1555 retries = 100; 1556 while (!(devctl & MUSB_DEVCTL_SESSION)) { 1557 devctl = musb_readb(mregs, MUSB_DEVCTL); 1558 if (retries-- < 1) 1559 break; 1560 } 1561 retries = 10000; 1562 while (devctl & MUSB_DEVCTL_SESSION) { 1563 devctl = musb_readb(mregs, MUSB_DEVCTL); 1564 if (retries-- < 1) 1565 break; 1566 } 1567 1568 spin_unlock_irqrestore(&musb->lock, flags); 1569 otg_start_srp(musb->xceiv->otg); 1570 spin_lock_irqsave(&musb->lock, flags); 1571 1572 /* Block idling for at least 1s */ 1573 musb_platform_try_idle(musb, 1574 jiffies + msecs_to_jiffies(1 * HZ)); 1575 1576 status = 0; 1577 goto done; 1578 default: 1579 musb_dbg(musb, "Unhandled wake: %s", 1580 usb_otg_state_string(musb->xceiv->otg->state)); 1581 goto done; 1582 } 1583 1584 status = 0; 1585 1586 power = musb_readb(mregs, MUSB_POWER); 1587 power |= MUSB_POWER_RESUME; 1588 musb_writeb(mregs, MUSB_POWER, power); 1589 musb_dbg(musb, "issue wakeup"); 1590 1591 /* FIXME do this next chunk in a timer callback, no udelay */ 1592 mdelay(2); 1593 1594 power = musb_readb(mregs, MUSB_POWER); 1595 power &= ~MUSB_POWER_RESUME; 1596 musb_writeb(mregs, MUSB_POWER, power); 1597 done: 1598 spin_unlock_irqrestore(&musb->lock, flags); 1599 return status; 1600 } 1601 1602 static int 1603 musb_gadget_set_self_powered(struct usb_gadget *gadget, int is_selfpowered) 1604 { 1605 gadget->is_selfpowered = !!is_selfpowered; 1606 return 0; 1607 } 1608 1609 static void musb_pullup(struct musb *musb, int is_on) 1610 { 1611 u8 power; 1612 1613 power = musb_readb(musb->mregs, MUSB_POWER); 1614 if (is_on) 1615 power |= MUSB_POWER_SOFTCONN; 1616 else 1617 power &= ~MUSB_POWER_SOFTCONN; 1618 1619 /* FIXME if on, HdrcStart; if off, HdrcStop */ 1620 1621 musb_dbg(musb, "gadget D+ pullup %s", 1622 is_on ? "on" : "off"); 1623 musb_writeb(musb->mregs, MUSB_POWER, power); 1624 } 1625 1626 #if 0 1627 static int musb_gadget_vbus_session(struct usb_gadget *gadget, int is_active) 1628 { 1629 musb_dbg(musb, "<= %s =>\n", __func__); 1630 1631 /* 1632 * FIXME iff driver's softconnect flag is set (as it is during probe, 1633 * though that can clear it), just musb_pullup(). 1634 */ 1635 1636 return -EINVAL; 1637 } 1638 #endif 1639 1640 static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA) 1641 { 1642 struct musb *musb = gadget_to_musb(gadget); 1643 1644 if (!musb->xceiv->set_power) 1645 return -EOPNOTSUPP; 1646 return usb_phy_set_power(musb->xceiv, mA); 1647 } 1648 1649 static void musb_gadget_work(struct work_struct *work) 1650 { 1651 struct musb *musb; 1652 unsigned long flags; 1653 1654 musb = container_of(work, struct musb, gadget_work.work); 1655 pm_runtime_get_sync(musb->controller); 1656 spin_lock_irqsave(&musb->lock, flags); 1657 musb_pullup(musb, musb->softconnect); 1658 spin_unlock_irqrestore(&musb->lock, flags); 1659 pm_runtime_mark_last_busy(musb->controller); 1660 pm_runtime_put_autosuspend(musb->controller); 1661 } 1662 1663 static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on) 1664 { 1665 struct musb *musb = gadget_to_musb(gadget); 1666 unsigned long flags; 1667 1668 is_on = !!is_on; 1669 1670 /* NOTE: this assumes we are sensing vbus; we'd rather 1671 * not pullup unless the B-session is active. 1672 */ 1673 spin_lock_irqsave(&musb->lock, flags); 1674 if (is_on != musb->softconnect) { 1675 musb->softconnect = is_on; 1676 schedule_delayed_work(&musb->gadget_work, 0); 1677 } 1678 spin_unlock_irqrestore(&musb->lock, flags); 1679 1680 return 0; 1681 } 1682 1683 #ifdef CONFIG_BLACKFIN 1684 static struct usb_ep *musb_match_ep(struct usb_gadget *g, 1685 struct usb_endpoint_descriptor *desc, 1686 struct usb_ss_ep_comp_descriptor *ep_comp) 1687 { 1688 struct usb_ep *ep = NULL; 1689 1690 switch (usb_endpoint_type(desc)) { 1691 case USB_ENDPOINT_XFER_ISOC: 1692 case USB_ENDPOINT_XFER_BULK: 1693 if (usb_endpoint_dir_in(desc)) 1694 ep = gadget_find_ep_by_name(g, "ep5in"); 1695 else 1696 ep = gadget_find_ep_by_name(g, "ep6out"); 1697 break; 1698 case USB_ENDPOINT_XFER_INT: 1699 if (usb_endpoint_dir_in(desc)) 1700 ep = gadget_find_ep_by_name(g, "ep1in"); 1701 else 1702 ep = gadget_find_ep_by_name(g, "ep2out"); 1703 break; 1704 default: 1705 break; 1706 } 1707 1708 if (ep && usb_gadget_ep_match_desc(g, ep, desc, ep_comp)) 1709 return ep; 1710 1711 return NULL; 1712 } 1713 #else 1714 #define musb_match_ep NULL 1715 #endif 1716 1717 static int musb_gadget_start(struct usb_gadget *g, 1718 struct usb_gadget_driver *driver); 1719 static int musb_gadget_stop(struct usb_gadget *g); 1720 1721 static const struct usb_gadget_ops musb_gadget_operations = { 1722 .get_frame = musb_gadget_get_frame, 1723 .wakeup = musb_gadget_wakeup, 1724 .set_selfpowered = musb_gadget_set_self_powered, 1725 /* .vbus_session = musb_gadget_vbus_session, */ 1726 .vbus_draw = musb_gadget_vbus_draw, 1727 .pullup = musb_gadget_pullup, 1728 .udc_start = musb_gadget_start, 1729 .udc_stop = musb_gadget_stop, 1730 .match_ep = musb_match_ep, 1731 }; 1732 1733 /* ----------------------------------------------------------------------- */ 1734 1735 /* Registration */ 1736 1737 /* Only this registration code "knows" the rule (from USB standards) 1738 * about there being only one external upstream port. It assumes 1739 * all peripheral ports are external... 1740 */ 1741 1742 static void 1743 init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in) 1744 { 1745 struct musb_hw_ep *hw_ep = musb->endpoints + epnum; 1746 1747 memset(ep, 0, sizeof *ep); 1748 1749 ep->current_epnum = epnum; 1750 ep->musb = musb; 1751 ep->hw_ep = hw_ep; 1752 ep->is_in = is_in; 1753 1754 INIT_LIST_HEAD(&ep->req_list); 1755 1756 sprintf(ep->name, "ep%d%s", epnum, 1757 (!epnum || hw_ep->is_shared_fifo) ? "" : ( 1758 is_in ? "in" : "out")); 1759 ep->end_point.name = ep->name; 1760 INIT_LIST_HEAD(&ep->end_point.ep_list); 1761 if (!epnum) { 1762 usb_ep_set_maxpacket_limit(&ep->end_point, 64); 1763 ep->end_point.caps.type_control = true; 1764 ep->end_point.ops = &musb_g_ep0_ops; 1765 musb->g.ep0 = &ep->end_point; 1766 } else { 1767 if (is_in) 1768 usb_ep_set_maxpacket_limit(&ep->end_point, hw_ep->max_packet_sz_tx); 1769 else 1770 usb_ep_set_maxpacket_limit(&ep->end_point, hw_ep->max_packet_sz_rx); 1771 ep->end_point.caps.type_iso = true; 1772 ep->end_point.caps.type_bulk = true; 1773 ep->end_point.caps.type_int = true; 1774 ep->end_point.ops = &musb_ep_ops; 1775 list_add_tail(&ep->end_point.ep_list, &musb->g.ep_list); 1776 } 1777 1778 if (!epnum || hw_ep->is_shared_fifo) { 1779 ep->end_point.caps.dir_in = true; 1780 ep->end_point.caps.dir_out = true; 1781 } else if (is_in) 1782 ep->end_point.caps.dir_in = true; 1783 else 1784 ep->end_point.caps.dir_out = true; 1785 } 1786 1787 /* 1788 * Initialize the endpoints exposed to peripheral drivers, with backlinks 1789 * to the rest of the driver state. 1790 */ 1791 static inline void musb_g_init_endpoints(struct musb *musb) 1792 { 1793 u8 epnum; 1794 struct musb_hw_ep *hw_ep; 1795 unsigned count = 0; 1796 1797 /* initialize endpoint list just once */ 1798 INIT_LIST_HEAD(&(musb->g.ep_list)); 1799 1800 for (epnum = 0, hw_ep = musb->endpoints; 1801 epnum < musb->nr_endpoints; 1802 epnum++, hw_ep++) { 1803 if (hw_ep->is_shared_fifo /* || !epnum */) { 1804 init_peripheral_ep(musb, &hw_ep->ep_in, epnum, 0); 1805 count++; 1806 } else { 1807 if (hw_ep->max_packet_sz_tx) { 1808 init_peripheral_ep(musb, &hw_ep->ep_in, 1809 epnum, 1); 1810 count++; 1811 } 1812 if (hw_ep->max_packet_sz_rx) { 1813 init_peripheral_ep(musb, &hw_ep->ep_out, 1814 epnum, 0); 1815 count++; 1816 } 1817 } 1818 } 1819 } 1820 1821 /* called once during driver setup to initialize and link into 1822 * the driver model; memory is zeroed. 1823 */ 1824 int musb_gadget_setup(struct musb *musb) 1825 { 1826 int status; 1827 1828 /* REVISIT minor race: if (erroneously) setting up two 1829 * musb peripherals at the same time, only the bus lock 1830 * is probably held. 1831 */ 1832 1833 musb->g.ops = &musb_gadget_operations; 1834 musb->g.max_speed = USB_SPEED_HIGH; 1835 musb->g.speed = USB_SPEED_UNKNOWN; 1836 1837 MUSB_DEV_MODE(musb); 1838 musb->xceiv->otg->default_a = 0; 1839 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 1840 1841 /* this "gadget" abstracts/virtualizes the controller */ 1842 musb->g.name = musb_driver_name; 1843 #if IS_ENABLED(CONFIG_USB_MUSB_DUAL_ROLE) 1844 musb->g.is_otg = 1; 1845 #elif IS_ENABLED(CONFIG_USB_MUSB_GADGET) 1846 musb->g.is_otg = 0; 1847 #endif 1848 INIT_DELAYED_WORK(&musb->gadget_work, musb_gadget_work); 1849 musb_g_init_endpoints(musb); 1850 1851 musb->is_active = 0; 1852 musb_platform_try_idle(musb, 0); 1853 1854 status = usb_add_gadget_udc(musb->controller, &musb->g); 1855 if (status) 1856 goto err; 1857 1858 return 0; 1859 err: 1860 musb->g.dev.parent = NULL; 1861 device_unregister(&musb->g.dev); 1862 return status; 1863 } 1864 1865 void musb_gadget_cleanup(struct musb *musb) 1866 { 1867 if (musb->port_mode == MUSB_PORT_MODE_HOST) 1868 return; 1869 1870 cancel_delayed_work_sync(&musb->gadget_work); 1871 usb_del_gadget_udc(&musb->g); 1872 } 1873 1874 /* 1875 * Register the gadget driver. Used by gadget drivers when 1876 * registering themselves with the controller. 1877 * 1878 * -EINVAL something went wrong (not driver) 1879 * -EBUSY another gadget is already using the controller 1880 * -ENOMEM no memory to perform the operation 1881 * 1882 * @param driver the gadget driver 1883 * @return <0 if error, 0 if everything is fine 1884 */ 1885 static int musb_gadget_start(struct usb_gadget *g, 1886 struct usb_gadget_driver *driver) 1887 { 1888 struct musb *musb = gadget_to_musb(g); 1889 struct usb_otg *otg = musb->xceiv->otg; 1890 unsigned long flags; 1891 int retval = 0; 1892 1893 if (driver->max_speed < USB_SPEED_HIGH) { 1894 retval = -EINVAL; 1895 goto err; 1896 } 1897 1898 pm_runtime_get_sync(musb->controller); 1899 1900 musb->softconnect = 0; 1901 musb->gadget_driver = driver; 1902 1903 spin_lock_irqsave(&musb->lock, flags); 1904 musb->is_active = 1; 1905 1906 otg_set_peripheral(otg, &musb->g); 1907 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 1908 spin_unlock_irqrestore(&musb->lock, flags); 1909 1910 musb_start(musb); 1911 1912 /* REVISIT: funcall to other code, which also 1913 * handles power budgeting ... this way also 1914 * ensures HdrcStart is indirectly called. 1915 */ 1916 if (musb->xceiv->last_event == USB_EVENT_ID) 1917 musb_platform_set_vbus(musb, 1); 1918 1919 pm_runtime_mark_last_busy(musb->controller); 1920 pm_runtime_put_autosuspend(musb->controller); 1921 1922 return 0; 1923 1924 err: 1925 return retval; 1926 } 1927 1928 /* 1929 * Unregister the gadget driver. Used by gadget drivers when 1930 * unregistering themselves from the controller. 1931 * 1932 * @param driver the gadget driver to unregister 1933 */ 1934 static int musb_gadget_stop(struct usb_gadget *g) 1935 { 1936 struct musb *musb = gadget_to_musb(g); 1937 unsigned long flags; 1938 1939 pm_runtime_get_sync(musb->controller); 1940 1941 /* 1942 * REVISIT always use otg_set_peripheral() here too; 1943 * this needs to shut down the OTG engine. 1944 */ 1945 1946 spin_lock_irqsave(&musb->lock, flags); 1947 1948 musb_hnp_stop(musb); 1949 1950 (void) musb_gadget_vbus_draw(&musb->g, 0); 1951 1952 musb->xceiv->otg->state = OTG_STATE_UNDEFINED; 1953 musb_stop(musb); 1954 otg_set_peripheral(musb->xceiv->otg, NULL); 1955 1956 musb->is_active = 0; 1957 musb->gadget_driver = NULL; 1958 musb_platform_try_idle(musb, 0); 1959 spin_unlock_irqrestore(&musb->lock, flags); 1960 1961 /* 1962 * FIXME we need to be able to register another 1963 * gadget driver here and have everything work; 1964 * that currently misbehaves. 1965 */ 1966 1967 /* Force check of devctl register for PM runtime */ 1968 schedule_work(&musb->irq_work); 1969 1970 pm_runtime_mark_last_busy(musb->controller); 1971 pm_runtime_put_autosuspend(musb->controller); 1972 1973 return 0; 1974 } 1975 1976 /* ----------------------------------------------------------------------- */ 1977 1978 /* lifecycle operations called through plat_uds.c */ 1979 1980 void musb_g_resume(struct musb *musb) 1981 { 1982 musb->is_suspended = 0; 1983 switch (musb->xceiv->otg->state) { 1984 case OTG_STATE_B_IDLE: 1985 break; 1986 case OTG_STATE_B_WAIT_ACON: 1987 case OTG_STATE_B_PERIPHERAL: 1988 musb->is_active = 1; 1989 if (musb->gadget_driver && musb->gadget_driver->resume) { 1990 spin_unlock(&musb->lock); 1991 musb->gadget_driver->resume(&musb->g); 1992 spin_lock(&musb->lock); 1993 } 1994 break; 1995 default: 1996 WARNING("unhandled RESUME transition (%s)\n", 1997 usb_otg_state_string(musb->xceiv->otg->state)); 1998 } 1999 } 2000 2001 /* called when SOF packets stop for 3+ msec */ 2002 void musb_g_suspend(struct musb *musb) 2003 { 2004 u8 devctl; 2005 2006 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 2007 musb_dbg(musb, "musb_g_suspend: devctl %02x", devctl); 2008 2009 switch (musb->xceiv->otg->state) { 2010 case OTG_STATE_B_IDLE: 2011 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) 2012 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL; 2013 break; 2014 case OTG_STATE_B_PERIPHERAL: 2015 musb->is_suspended = 1; 2016 if (musb->gadget_driver && musb->gadget_driver->suspend) { 2017 spin_unlock(&musb->lock); 2018 musb->gadget_driver->suspend(&musb->g); 2019 spin_lock(&musb->lock); 2020 } 2021 break; 2022 default: 2023 /* REVISIT if B_HOST, clear DEVCTL.HOSTREQ; 2024 * A_PERIPHERAL may need care too 2025 */ 2026 WARNING("unhandled SUSPEND transition (%s)", 2027 usb_otg_state_string(musb->xceiv->otg->state)); 2028 } 2029 } 2030 2031 /* Called during SRP */ 2032 void musb_g_wakeup(struct musb *musb) 2033 { 2034 musb_gadget_wakeup(&musb->g); 2035 } 2036 2037 /* called when VBUS drops below session threshold, and in other cases */ 2038 void musb_g_disconnect(struct musb *musb) 2039 { 2040 void __iomem *mregs = musb->mregs; 2041 u8 devctl = musb_readb(mregs, MUSB_DEVCTL); 2042 2043 musb_dbg(musb, "musb_g_disconnect: devctl %02x", devctl); 2044 2045 /* clear HR */ 2046 musb_writeb(mregs, MUSB_DEVCTL, devctl & MUSB_DEVCTL_SESSION); 2047 2048 /* don't draw vbus until new b-default session */ 2049 (void) musb_gadget_vbus_draw(&musb->g, 0); 2050 2051 musb->g.speed = USB_SPEED_UNKNOWN; 2052 if (musb->gadget_driver && musb->gadget_driver->disconnect) { 2053 spin_unlock(&musb->lock); 2054 musb->gadget_driver->disconnect(&musb->g); 2055 spin_lock(&musb->lock); 2056 } 2057 2058 switch (musb->xceiv->otg->state) { 2059 default: 2060 musb_dbg(musb, "Unhandled disconnect %s, setting a_idle", 2061 usb_otg_state_string(musb->xceiv->otg->state)); 2062 musb->xceiv->otg->state = OTG_STATE_A_IDLE; 2063 MUSB_HST_MODE(musb); 2064 break; 2065 case OTG_STATE_A_PERIPHERAL: 2066 musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON; 2067 MUSB_HST_MODE(musb); 2068 break; 2069 case OTG_STATE_B_WAIT_ACON: 2070 case OTG_STATE_B_HOST: 2071 case OTG_STATE_B_PERIPHERAL: 2072 case OTG_STATE_B_IDLE: 2073 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 2074 break; 2075 case OTG_STATE_B_SRP_INIT: 2076 break; 2077 } 2078 2079 musb->is_active = 0; 2080 } 2081 2082 void musb_g_reset(struct musb *musb) 2083 __releases(musb->lock) 2084 __acquires(musb->lock) 2085 { 2086 void __iomem *mbase = musb->mregs; 2087 u8 devctl = musb_readb(mbase, MUSB_DEVCTL); 2088 u8 power; 2089 2090 musb_dbg(musb, "<== %s driver '%s'", 2091 (devctl & MUSB_DEVCTL_BDEVICE) 2092 ? "B-Device" : "A-Device", 2093 musb->gadget_driver 2094 ? musb->gadget_driver->driver.name 2095 : NULL 2096 ); 2097 2098 /* report reset, if we didn't already (flushing EP state) */ 2099 if (musb->gadget_driver && musb->g.speed != USB_SPEED_UNKNOWN) { 2100 spin_unlock(&musb->lock); 2101 usb_gadget_udc_reset(&musb->g, musb->gadget_driver); 2102 spin_lock(&musb->lock); 2103 } 2104 2105 /* clear HR */ 2106 else if (devctl & MUSB_DEVCTL_HR) 2107 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION); 2108 2109 2110 /* what speed did we negotiate? */ 2111 power = musb_readb(mbase, MUSB_POWER); 2112 musb->g.speed = (power & MUSB_POWER_HSMODE) 2113 ? USB_SPEED_HIGH : USB_SPEED_FULL; 2114 2115 /* start in USB_STATE_DEFAULT */ 2116 musb->is_active = 1; 2117 musb->is_suspended = 0; 2118 MUSB_DEV_MODE(musb); 2119 musb->address = 0; 2120 musb->ep0_state = MUSB_EP0_STAGE_SETUP; 2121 2122 musb->may_wakeup = 0; 2123 musb->g.b_hnp_enable = 0; 2124 musb->g.a_alt_hnp_support = 0; 2125 musb->g.a_hnp_support = 0; 2126 musb->g.quirk_zlp_not_supp = 1; 2127 2128 /* Normal reset, as B-Device; 2129 * or else after HNP, as A-Device 2130 */ 2131 if (!musb->g.is_otg) { 2132 /* USB device controllers that are not OTG compatible 2133 * may not have DEVCTL register in silicon. 2134 * In that case, do not rely on devctl for setting 2135 * peripheral mode. 2136 */ 2137 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL; 2138 musb->g.is_a_peripheral = 0; 2139 } else if (devctl & MUSB_DEVCTL_BDEVICE) { 2140 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL; 2141 musb->g.is_a_peripheral = 0; 2142 } else { 2143 musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL; 2144 musb->g.is_a_peripheral = 1; 2145 } 2146 2147 /* start with default limits on VBUS power draw */ 2148 (void) musb_gadget_vbus_draw(&musb->g, 8); 2149 } 2150