gadget.c revision 138801aaa566ecb5a5739a85909b9ec7285efd70
1/** 2 * gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link 3 * 4 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com 5 * 6 * Authors: Felipe Balbi <balbi@ti.com>, 7 * Sebastian Andrzej Siewior <bigeasy@linutronix.de> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions, and the following disclaimer, 14 * without modification. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The names of the above-listed copyright holders may not be used 19 * to endorse or promote products derived from this software without 20 * specific prior written permission. 21 * 22 * ALTERNATIVELY, this software may be distributed under the terms of the 23 * GNU General Public License ("GPL") version 2, as published by the Free 24 * Software Foundation. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 27 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 28 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 30 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 31 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 32 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 33 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include <linux/kernel.h> 40#include <linux/delay.h> 41#include <linux/slab.h> 42#include <linux/spinlock.h> 43#include <linux/platform_device.h> 44#include <linux/pm_runtime.h> 45#include <linux/interrupt.h> 46#include <linux/io.h> 47#include <linux/list.h> 48#include <linux/dma-mapping.h> 49 50#include <linux/usb/ch9.h> 51#include <linux/usb/gadget.h> 52 53#include "core.h" 54#include "gadget.h" 55#include "io.h" 56 57#define DMA_ADDR_INVALID (~(dma_addr_t)0) 58 59/** 60 * dwc3_gadget_set_test_mode - Enables USB2 Test Modes 61 * @dwc: pointer to our context structure 62 * @mode: the mode to set (J, K SE0 NAK, Force Enable) 63 * 64 * Caller should take care of locking. This function will 65 * return 0 on success or -EINVAL if wrong Test Selector 66 * is passed 67 */ 68int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode) 69{ 70 u32 reg; 71 72 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 73 reg &= ~DWC3_DCTL_TSTCTRL_MASK; 74 75 switch (mode) { 76 case TEST_J: 77 case TEST_K: 78 case TEST_SE0_NAK: 79 case TEST_PACKET: 80 case TEST_FORCE_EN: 81 reg |= mode << 1; 82 break; 83 default: 84 return -EINVAL; 85 } 86 87 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 88 89 return 0; 90} 91 92/** 93 * dwc3_gadget_set_link_state - Sets USB Link to a particular State 94 * @dwc: pointer to our context structure 95 * @state: the state to put link into 96 * 97 * Caller should take care of locking. This function will 98 * return 0 on success or -EINVAL. 99 */ 100int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state) 101{ 102 int retries = 100; 103 u32 reg; 104 105 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 106 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK; 107 108 /* set requested state */ 109 reg |= DWC3_DCTL_ULSTCHNGREQ(state); 110 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 111 112 /* wait for a change in DSTS */ 113 while (--retries) { 114 reg = dwc3_readl(dwc->regs, DWC3_DSTS); 115 116 /* in HS, means ON */ 117 if (DWC3_DSTS_USBLNKST(reg) == state) 118 return 0; 119 120 udelay(500); 121 } 122 123 dev_vdbg(dwc->dev, "link state change request timed out\n"); 124 125 return -ETIMEDOUT; 126} 127 128void dwc3_map_buffer_to_dma(struct dwc3_request *req) 129{ 130 struct dwc3 *dwc = req->dep->dwc; 131 132 if (req->request.length == 0) { 133 /* req->request.dma = dwc->setup_buf_addr; */ 134 return; 135 } 136 137 if (req->request.num_sgs) { 138 int mapped; 139 140 mapped = dma_map_sg(dwc->dev, req->request.sg, 141 req->request.num_sgs, 142 req->direction ? DMA_TO_DEVICE 143 : DMA_FROM_DEVICE); 144 if (mapped < 0) { 145 dev_err(dwc->dev, "failed to map SGs\n"); 146 return; 147 } 148 149 req->request.num_mapped_sgs = mapped; 150 return; 151 } 152 153 if (req->request.dma == DMA_ADDR_INVALID) { 154 req->request.dma = dma_map_single(dwc->dev, req->request.buf, 155 req->request.length, req->direction 156 ? DMA_TO_DEVICE : DMA_FROM_DEVICE); 157 req->mapped = true; 158 } 159} 160 161void dwc3_unmap_buffer_from_dma(struct dwc3_request *req) 162{ 163 struct dwc3 *dwc = req->dep->dwc; 164 165 if (req->request.length == 0) { 166 req->request.dma = DMA_ADDR_INVALID; 167 return; 168 } 169 170 if (req->request.num_mapped_sgs) { 171 req->request.dma = DMA_ADDR_INVALID; 172 dma_unmap_sg(dwc->dev, req->request.sg, 173 req->request.num_mapped_sgs, 174 req->direction ? DMA_TO_DEVICE 175 : DMA_FROM_DEVICE); 176 177 req->request.num_mapped_sgs = 0; 178 return; 179 } 180 181 if (req->mapped) { 182 dma_unmap_single(dwc->dev, req->request.dma, 183 req->request.length, req->direction 184 ? DMA_TO_DEVICE : DMA_FROM_DEVICE); 185 req->mapped = 0; 186 req->request.dma = DMA_ADDR_INVALID; 187 } 188} 189 190void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req, 191 int status) 192{ 193 struct dwc3 *dwc = dep->dwc; 194 195 if (req->queued) { 196 if (req->request.num_mapped_sgs) 197 dep->busy_slot += req->request.num_mapped_sgs; 198 else 199 dep->busy_slot++; 200 201 /* 202 * Skip LINK TRB. We can't use req->trb and check for 203 * DWC3_TRBCTL_LINK_TRB because it points the TRB we just 204 * completed (not the LINK TRB). 205 */ 206 if (((dep->busy_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) && 207 usb_endpoint_xfer_isoc(dep->desc)) 208 dep->busy_slot++; 209 } 210 list_del(&req->list); 211 req->trb = NULL; 212 213 if (req->request.status == -EINPROGRESS) 214 req->request.status = status; 215 216 dwc3_unmap_buffer_from_dma(req); 217 218 dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n", 219 req, dep->name, req->request.actual, 220 req->request.length, status); 221 222 spin_unlock(&dwc->lock); 223 req->request.complete(&req->dep->endpoint, &req->request); 224 spin_lock(&dwc->lock); 225} 226 227static const char *dwc3_gadget_ep_cmd_string(u8 cmd) 228{ 229 switch (cmd) { 230 case DWC3_DEPCMD_DEPSTARTCFG: 231 return "Start New Configuration"; 232 case DWC3_DEPCMD_ENDTRANSFER: 233 return "End Transfer"; 234 case DWC3_DEPCMD_UPDATETRANSFER: 235 return "Update Transfer"; 236 case DWC3_DEPCMD_STARTTRANSFER: 237 return "Start Transfer"; 238 case DWC3_DEPCMD_CLEARSTALL: 239 return "Clear Stall"; 240 case DWC3_DEPCMD_SETSTALL: 241 return "Set Stall"; 242 case DWC3_DEPCMD_GETSEQNUMBER: 243 return "Get Data Sequence Number"; 244 case DWC3_DEPCMD_SETTRANSFRESOURCE: 245 return "Set Endpoint Transfer Resource"; 246 case DWC3_DEPCMD_SETEPCONFIG: 247 return "Set Endpoint Configuration"; 248 default: 249 return "UNKNOWN command"; 250 } 251} 252 253int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep, 254 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params) 255{ 256 struct dwc3_ep *dep = dwc->eps[ep]; 257 u32 timeout = 500; 258 u32 reg; 259 260 dev_vdbg(dwc->dev, "%s: cmd '%s' params %08x %08x %08x\n", 261 dep->name, 262 dwc3_gadget_ep_cmd_string(cmd), params->param0, 263 params->param1, params->param2); 264 265 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0); 266 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1); 267 dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2); 268 269 dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT); 270 do { 271 reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep)); 272 if (!(reg & DWC3_DEPCMD_CMDACT)) { 273 dev_vdbg(dwc->dev, "Command Complete --> %d\n", 274 DWC3_DEPCMD_STATUS(reg)); 275 return 0; 276 } 277 278 /* 279 * We can't sleep here, because it is also called from 280 * interrupt context. 281 */ 282 timeout--; 283 if (!timeout) 284 return -ETIMEDOUT; 285 286 udelay(1); 287 } while (1); 288} 289 290static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep, 291 struct dwc3_trb_hw *trb) 292{ 293 u32 offset = (char *) trb - (char *) dep->trb_pool; 294 295 return dep->trb_pool_dma + offset; 296} 297 298static int dwc3_alloc_trb_pool(struct dwc3_ep *dep) 299{ 300 struct dwc3 *dwc = dep->dwc; 301 302 if (dep->trb_pool) 303 return 0; 304 305 if (dep->number == 0 || dep->number == 1) 306 return 0; 307 308 dep->trb_pool = dma_alloc_coherent(dwc->dev, 309 sizeof(struct dwc3_trb) * DWC3_TRB_NUM, 310 &dep->trb_pool_dma, GFP_KERNEL); 311 if (!dep->trb_pool) { 312 dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n", 313 dep->name); 314 return -ENOMEM; 315 } 316 317 return 0; 318} 319 320static void dwc3_free_trb_pool(struct dwc3_ep *dep) 321{ 322 struct dwc3 *dwc = dep->dwc; 323 324 dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM, 325 dep->trb_pool, dep->trb_pool_dma); 326 327 dep->trb_pool = NULL; 328 dep->trb_pool_dma = 0; 329} 330 331static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep) 332{ 333 struct dwc3_gadget_ep_cmd_params params; 334 u32 cmd; 335 336 memset(¶ms, 0x00, sizeof(params)); 337 338 if (dep->number != 1) { 339 cmd = DWC3_DEPCMD_DEPSTARTCFG; 340 /* XferRscIdx == 0 for ep0 and 2 for the remaining */ 341 if (dep->number > 1) { 342 if (dwc->start_config_issued) 343 return 0; 344 dwc->start_config_issued = true; 345 cmd |= DWC3_DEPCMD_PARAM(2); 346 } 347 348 return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, ¶ms); 349 } 350 351 return 0; 352} 353 354static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep, 355 const struct usb_endpoint_descriptor *desc, 356 const struct usb_ss_ep_comp_descriptor *comp_desc) 357{ 358 struct dwc3_gadget_ep_cmd_params params; 359 360 memset(¶ms, 0x00, sizeof(params)); 361 362 params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc)) 363 | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc)) 364 | DWC3_DEPCFG_BURST_SIZE(dep->endpoint.maxburst); 365 366 params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN 367 | DWC3_DEPCFG_XFER_NOT_READY_EN; 368 369 if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) { 370 params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE 371 | DWC3_DEPCFG_STREAM_EVENT_EN; 372 dep->stream_capable = true; 373 } 374 375 if (usb_endpoint_xfer_isoc(desc)) 376 params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN; 377 378 /* 379 * We are doing 1:1 mapping for endpoints, meaning 380 * Physical Endpoints 2 maps to Logical Endpoint 2 and 381 * so on. We consider the direction bit as part of the physical 382 * endpoint number. So USB endpoint 0x81 is 0x03. 383 */ 384 params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number); 385 386 /* 387 * We must use the lower 16 TX FIFOs even though 388 * HW might have more 389 */ 390 if (dep->direction) 391 params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1); 392 393 if (desc->bInterval) { 394 params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1); 395 dep->interval = 1 << (desc->bInterval - 1); 396 } 397 398 return dwc3_send_gadget_ep_cmd(dwc, dep->number, 399 DWC3_DEPCMD_SETEPCONFIG, ¶ms); 400} 401 402static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep) 403{ 404 struct dwc3_gadget_ep_cmd_params params; 405 406 memset(¶ms, 0x00, sizeof(params)); 407 408 params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1); 409 410 return dwc3_send_gadget_ep_cmd(dwc, dep->number, 411 DWC3_DEPCMD_SETTRANSFRESOURCE, ¶ms); 412} 413 414/** 415 * __dwc3_gadget_ep_enable - Initializes a HW endpoint 416 * @dep: endpoint to be initialized 417 * @desc: USB Endpoint Descriptor 418 * 419 * Caller should take care of locking 420 */ 421static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, 422 const struct usb_endpoint_descriptor *desc, 423 const struct usb_ss_ep_comp_descriptor *comp_desc) 424{ 425 struct dwc3 *dwc = dep->dwc; 426 u32 reg; 427 int ret = -ENOMEM; 428 429 if (!(dep->flags & DWC3_EP_ENABLED)) { 430 ret = dwc3_gadget_start_config(dwc, dep); 431 if (ret) 432 return ret; 433 } 434 435 ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc); 436 if (ret) 437 return ret; 438 439 if (!(dep->flags & DWC3_EP_ENABLED)) { 440 struct dwc3_trb_hw *trb_st_hw; 441 struct dwc3_trb_hw *trb_link_hw; 442 struct dwc3_trb trb_link; 443 444 ret = dwc3_gadget_set_xfer_resource(dwc, dep); 445 if (ret) 446 return ret; 447 448 dep->desc = desc; 449 dep->comp_desc = comp_desc; 450 dep->type = usb_endpoint_type(desc); 451 dep->flags |= DWC3_EP_ENABLED; 452 453 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA); 454 reg |= DWC3_DALEPENA_EP(dep->number); 455 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg); 456 457 if (!usb_endpoint_xfer_isoc(desc)) 458 return 0; 459 460 memset(&trb_link, 0, sizeof(trb_link)); 461 462 /* Link TRB for ISOC. The HWO but is never reset */ 463 trb_st_hw = &dep->trb_pool[0]; 464 465 trb_link.bplh = dwc3_trb_dma_offset(dep, trb_st_hw); 466 trb_link.trbctl = DWC3_TRBCTL_LINK_TRB; 467 trb_link.hwo = true; 468 469 trb_link_hw = &dep->trb_pool[DWC3_TRB_NUM - 1]; 470 dwc3_trb_to_hw(&trb_link, trb_link_hw); 471 } 472 473 return 0; 474} 475 476static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum); 477static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep) 478{ 479 struct dwc3_request *req; 480 481 if (!list_empty(&dep->req_queued)) 482 dwc3_stop_active_transfer(dwc, dep->number); 483 484 while (!list_empty(&dep->request_list)) { 485 req = next_request(&dep->request_list); 486 487 dwc3_gadget_giveback(dep, req, -ESHUTDOWN); 488 } 489} 490 491/** 492 * __dwc3_gadget_ep_disable - Disables a HW endpoint 493 * @dep: the endpoint to disable 494 * 495 * This function also removes requests which are currently processed ny the 496 * hardware and those which are not yet scheduled. 497 * Caller should take care of locking. 498 */ 499static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep) 500{ 501 struct dwc3 *dwc = dep->dwc; 502 u32 reg; 503 504 dwc3_remove_requests(dwc, dep); 505 506 reg = dwc3_readl(dwc->regs, DWC3_DALEPENA); 507 reg &= ~DWC3_DALEPENA_EP(dep->number); 508 dwc3_writel(dwc->regs, DWC3_DALEPENA, reg); 509 510 dep->stream_capable = false; 511 dep->desc = NULL; 512 dep->comp_desc = NULL; 513 dep->type = 0; 514 dep->flags = 0; 515 516 return 0; 517} 518 519/* -------------------------------------------------------------------------- */ 520 521static int dwc3_gadget_ep0_enable(struct usb_ep *ep, 522 const struct usb_endpoint_descriptor *desc) 523{ 524 return -EINVAL; 525} 526 527static int dwc3_gadget_ep0_disable(struct usb_ep *ep) 528{ 529 return -EINVAL; 530} 531 532/* -------------------------------------------------------------------------- */ 533 534static int dwc3_gadget_ep_enable(struct usb_ep *ep, 535 const struct usb_endpoint_descriptor *desc) 536{ 537 struct dwc3_ep *dep; 538 struct dwc3 *dwc; 539 unsigned long flags; 540 int ret; 541 542 if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) { 543 pr_debug("dwc3: invalid parameters\n"); 544 return -EINVAL; 545 } 546 547 if (!desc->wMaxPacketSize) { 548 pr_debug("dwc3: missing wMaxPacketSize\n"); 549 return -EINVAL; 550 } 551 552 dep = to_dwc3_ep(ep); 553 dwc = dep->dwc; 554 555 switch (usb_endpoint_type(desc)) { 556 case USB_ENDPOINT_XFER_CONTROL: 557 strncat(dep->name, "-control", sizeof(dep->name)); 558 break; 559 case USB_ENDPOINT_XFER_ISOC: 560 strncat(dep->name, "-isoc", sizeof(dep->name)); 561 break; 562 case USB_ENDPOINT_XFER_BULK: 563 strncat(dep->name, "-bulk", sizeof(dep->name)); 564 break; 565 case USB_ENDPOINT_XFER_INT: 566 strncat(dep->name, "-int", sizeof(dep->name)); 567 break; 568 default: 569 dev_err(dwc->dev, "invalid endpoint transfer type\n"); 570 } 571 572 if (dep->flags & DWC3_EP_ENABLED) { 573 dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n", 574 dep->name); 575 return 0; 576 } 577 578 dev_vdbg(dwc->dev, "Enabling %s\n", dep->name); 579 580 spin_lock_irqsave(&dwc->lock, flags); 581 ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc); 582 spin_unlock_irqrestore(&dwc->lock, flags); 583 584 return ret; 585} 586 587static int dwc3_gadget_ep_disable(struct usb_ep *ep) 588{ 589 struct dwc3_ep *dep; 590 struct dwc3 *dwc; 591 unsigned long flags; 592 int ret; 593 594 if (!ep) { 595 pr_debug("dwc3: invalid parameters\n"); 596 return -EINVAL; 597 } 598 599 dep = to_dwc3_ep(ep); 600 dwc = dep->dwc; 601 602 if (!(dep->flags & DWC3_EP_ENABLED)) { 603 dev_WARN_ONCE(dwc->dev, true, "%s is already disabled\n", 604 dep->name); 605 return 0; 606 } 607 608 snprintf(dep->name, sizeof(dep->name), "ep%d%s", 609 dep->number >> 1, 610 (dep->number & 1) ? "in" : "out"); 611 612 spin_lock_irqsave(&dwc->lock, flags); 613 ret = __dwc3_gadget_ep_disable(dep); 614 spin_unlock_irqrestore(&dwc->lock, flags); 615 616 return ret; 617} 618 619static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep, 620 gfp_t gfp_flags) 621{ 622 struct dwc3_request *req; 623 struct dwc3_ep *dep = to_dwc3_ep(ep); 624 struct dwc3 *dwc = dep->dwc; 625 626 req = kzalloc(sizeof(*req), gfp_flags); 627 if (!req) { 628 dev_err(dwc->dev, "not enough memory\n"); 629 return NULL; 630 } 631 632 req->epnum = dep->number; 633 req->dep = dep; 634 req->request.dma = DMA_ADDR_INVALID; 635 636 return &req->request; 637} 638 639static void dwc3_gadget_ep_free_request(struct usb_ep *ep, 640 struct usb_request *request) 641{ 642 struct dwc3_request *req = to_dwc3_request(request); 643 644 kfree(req); 645} 646 647/** 648 * dwc3_prepare_one_trb - setup one TRB from one request 649 * @dep: endpoint for which this request is prepared 650 * @req: dwc3_request pointer 651 */ 652static void dwc3_prepare_one_trb(struct dwc3_ep *dep, 653 struct dwc3_request *req, dma_addr_t dma, 654 unsigned length, unsigned last, unsigned chain) 655{ 656 struct dwc3 *dwc = dep->dwc; 657 struct dwc3_trb_hw *trb_hw; 658 struct dwc3_trb trb; 659 660 unsigned int cur_slot; 661 662 dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n", 663 dep->name, req, (unsigned long long) dma, 664 length, last ? " last" : "", 665 chain ? " chain" : ""); 666 667 trb_hw = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK]; 668 cur_slot = dep->free_slot; 669 dep->free_slot++; 670 671 /* Skip the LINK-TRB on ISOC */ 672 if (((cur_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) && 673 usb_endpoint_xfer_isoc(dep->desc)) 674 return; 675 676 memset(&trb, 0, sizeof(trb)); 677 if (!req->trb) { 678 dwc3_gadget_move_request_queued(req); 679 req->trb = trb_hw; 680 req->trb_dma = dwc3_trb_dma_offset(dep, trb_hw); 681 } 682 683 if (usb_endpoint_xfer_isoc(dep->desc)) { 684 trb.isp_imi = true; 685 trb.csp = true; 686 } else { 687 trb.chn = chain; 688 trb.lst = last; 689 } 690 691 if (usb_endpoint_xfer_bulk(dep->desc) && dep->stream_capable) 692 trb.sid_sofn = req->request.stream_id; 693 694 switch (usb_endpoint_type(dep->desc)) { 695 case USB_ENDPOINT_XFER_CONTROL: 696 trb.trbctl = DWC3_TRBCTL_CONTROL_SETUP; 697 break; 698 699 case USB_ENDPOINT_XFER_ISOC: 700 trb.trbctl = DWC3_TRBCTL_ISOCHRONOUS_FIRST; 701 702 /* IOC every DWC3_TRB_NUM / 4 so we can refill */ 703 if (!(cur_slot % (DWC3_TRB_NUM / 4))) 704 trb.ioc = last; 705 break; 706 707 case USB_ENDPOINT_XFER_BULK: 708 case USB_ENDPOINT_XFER_INT: 709 trb.trbctl = DWC3_TRBCTL_NORMAL; 710 break; 711 default: 712 /* 713 * This is only possible with faulty memory because we 714 * checked it already :) 715 */ 716 BUG(); 717 } 718 719 trb.length = length; 720 trb.bplh = dma; 721 trb.hwo = true; 722 723 dwc3_trb_to_hw(&trb, trb_hw); 724} 725 726/* 727 * dwc3_prepare_trbs - setup TRBs from requests 728 * @dep: endpoint for which requests are being prepared 729 * @starting: true if the endpoint is idle and no requests are queued. 730 * 731 * The functions goes through the requests list and setups TRBs for the 732 * transfers. The functions returns once there are not more TRBs available or 733 * it run out of requests. 734 */ 735static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting) 736{ 737 struct dwc3_request *req, *n; 738 u32 trbs_left; 739 unsigned int last_one = 0; 740 741 BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM); 742 743 /* the first request must not be queued */ 744 trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK; 745 746 /* 747 * if busy & slot are equal than it is either full or empty. If we are 748 * starting to proceed requests then we are empty. Otherwise we ar 749 * full and don't do anything 750 */ 751 if (!trbs_left) { 752 if (!starting) 753 return; 754 trbs_left = DWC3_TRB_NUM; 755 /* 756 * In case we start from scratch, we queue the ISOC requests 757 * starting from slot 1. This is done because we use ring 758 * buffer and have no LST bit to stop us. Instead, we place 759 * IOC bit TRB_NUM/4. We try to avoid to having an interrupt 760 * after the first request so we start at slot 1 and have 761 * 7 requests proceed before we hit the first IOC. 762 * Other transfer types don't use the ring buffer and are 763 * processed from the first TRB until the last one. Since we 764 * don't wrap around we have to start at the beginning. 765 */ 766 if (usb_endpoint_xfer_isoc(dep->desc)) { 767 dep->busy_slot = 1; 768 dep->free_slot = 1; 769 } else { 770 dep->busy_slot = 0; 771 dep->free_slot = 0; 772 } 773 } 774 775 /* The last TRB is a link TRB, not used for xfer */ 776 if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->desc)) 777 return; 778 779 list_for_each_entry_safe(req, n, &dep->request_list, list) { 780 unsigned length; 781 dma_addr_t dma; 782 783 if (req->request.num_mapped_sgs > 0) { 784 struct usb_request *request = &req->request; 785 struct scatterlist *sg = request->sg; 786 struct scatterlist *s; 787 int i; 788 789 for_each_sg(sg, s, request->num_mapped_sgs, i) { 790 unsigned chain = true; 791 792 length = sg_dma_len(s); 793 dma = sg_dma_address(s); 794 795 if (i == (request->num_mapped_sgs - 1) 796 || sg_is_last(s)) { 797 last_one = true; 798 chain = false; 799 } 800 801 trbs_left--; 802 if (!trbs_left) 803 last_one = true; 804 805 if (last_one) 806 chain = false; 807 808 dwc3_prepare_one_trb(dep, req, dma, length, 809 last_one, chain); 810 811 if (last_one) 812 break; 813 } 814 } else { 815 dma = req->request.dma; 816 length = req->request.length; 817 trbs_left--; 818 819 if (!trbs_left) 820 last_one = 1; 821 822 /* Is this the last request? */ 823 if (list_is_last(&req->list, &dep->request_list)) 824 last_one = 1; 825 826 dwc3_prepare_one_trb(dep, req, dma, length, 827 last_one, false); 828 829 if (last_one) 830 break; 831 } 832 } 833} 834 835static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param, 836 int start_new) 837{ 838 struct dwc3_gadget_ep_cmd_params params; 839 struct dwc3_request *req; 840 struct dwc3 *dwc = dep->dwc; 841 int ret; 842 u32 cmd; 843 844 if (start_new && (dep->flags & DWC3_EP_BUSY)) { 845 dev_vdbg(dwc->dev, "%s: endpoint busy\n", dep->name); 846 return -EBUSY; 847 } 848 dep->flags &= ~DWC3_EP_PENDING_REQUEST; 849 850 /* 851 * If we are getting here after a short-out-packet we don't enqueue any 852 * new requests as we try to set the IOC bit only on the last request. 853 */ 854 if (start_new) { 855 if (list_empty(&dep->req_queued)) 856 dwc3_prepare_trbs(dep, start_new); 857 858 /* req points to the first request which will be sent */ 859 req = next_request(&dep->req_queued); 860 } else { 861 dwc3_prepare_trbs(dep, start_new); 862 863 /* 864 * req points to the first request where HWO changed 865 * from 0 to 1 866 */ 867 req = next_request(&dep->req_queued); 868 } 869 if (!req) { 870 dep->flags |= DWC3_EP_PENDING_REQUEST; 871 return 0; 872 } 873 874 memset(¶ms, 0, sizeof(params)); 875 params.param0 = upper_32_bits(req->trb_dma); 876 params.param1 = lower_32_bits(req->trb_dma); 877 878 if (start_new) 879 cmd = DWC3_DEPCMD_STARTTRANSFER; 880 else 881 cmd = DWC3_DEPCMD_UPDATETRANSFER; 882 883 cmd |= DWC3_DEPCMD_PARAM(cmd_param); 884 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms); 885 if (ret < 0) { 886 dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n"); 887 888 /* 889 * FIXME we need to iterate over the list of requests 890 * here and stop, unmap, free and del each of the linked 891 * requests instead of we do now. 892 */ 893 dwc3_unmap_buffer_from_dma(req); 894 list_del(&req->list); 895 return ret; 896 } 897 898 dep->flags |= DWC3_EP_BUSY; 899 dep->res_trans_idx = dwc3_gadget_ep_get_transfer_index(dwc, 900 dep->number); 901 902 WARN_ON_ONCE(!dep->res_trans_idx); 903 904 return 0; 905} 906 907static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req) 908{ 909 req->request.actual = 0; 910 req->request.status = -EINPROGRESS; 911 req->direction = dep->direction; 912 req->epnum = dep->number; 913 914 /* 915 * We only add to our list of requests now and 916 * start consuming the list once we get XferNotReady 917 * IRQ. 918 * 919 * That way, we avoid doing anything that we don't need 920 * to do now and defer it until the point we receive a 921 * particular token from the Host side. 922 * 923 * This will also avoid Host cancelling URBs due to too 924 * many NACKs. 925 */ 926 dwc3_map_buffer_to_dma(req); 927 list_add_tail(&req->list, &dep->request_list); 928 929 /* 930 * There is one special case: XferNotReady with 931 * empty list of requests. We need to kick the 932 * transfer here in that situation, otherwise 933 * we will be NAKing forever. 934 * 935 * If we get XferNotReady before gadget driver 936 * has a chance to queue a request, we will ACK 937 * the IRQ but won't be able to receive the data 938 * until the next request is queued. The following 939 * code is handling exactly that. 940 */ 941 if (dep->flags & DWC3_EP_PENDING_REQUEST) { 942 int ret; 943 int start_trans; 944 945 start_trans = 1; 946 if (usb_endpoint_xfer_isoc(dep->endpoint.desc) && 947 dep->flags & DWC3_EP_BUSY) 948 start_trans = 0; 949 950 ret = __dwc3_gadget_kick_transfer(dep, 0, start_trans); 951 if (ret && ret != -EBUSY) { 952 struct dwc3 *dwc = dep->dwc; 953 954 dev_dbg(dwc->dev, "%s: failed to kick transfers\n", 955 dep->name); 956 } 957 }; 958 959 return 0; 960} 961 962static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request, 963 gfp_t gfp_flags) 964{ 965 struct dwc3_request *req = to_dwc3_request(request); 966 struct dwc3_ep *dep = to_dwc3_ep(ep); 967 struct dwc3 *dwc = dep->dwc; 968 969 unsigned long flags; 970 971 int ret; 972 973 if (!dep->desc) { 974 dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n", 975 request, ep->name); 976 return -ESHUTDOWN; 977 } 978 979 dev_vdbg(dwc->dev, "queing request %p to %s length %d\n", 980 request, ep->name, request->length); 981 982 spin_lock_irqsave(&dwc->lock, flags); 983 ret = __dwc3_gadget_ep_queue(dep, req); 984 spin_unlock_irqrestore(&dwc->lock, flags); 985 986 return ret; 987} 988 989static int dwc3_gadget_ep_dequeue(struct usb_ep *ep, 990 struct usb_request *request) 991{ 992 struct dwc3_request *req = to_dwc3_request(request); 993 struct dwc3_request *r = NULL; 994 995 struct dwc3_ep *dep = to_dwc3_ep(ep); 996 struct dwc3 *dwc = dep->dwc; 997 998 unsigned long flags; 999 int ret = 0; 1000 1001 spin_lock_irqsave(&dwc->lock, flags); 1002 1003 list_for_each_entry(r, &dep->request_list, list) { 1004 if (r == req) 1005 break; 1006 } 1007 1008 if (r != req) { 1009 list_for_each_entry(r, &dep->req_queued, list) { 1010 if (r == req) 1011 break; 1012 } 1013 if (r == req) { 1014 /* wait until it is processed */ 1015 dwc3_stop_active_transfer(dwc, dep->number); 1016 goto out0; 1017 } 1018 dev_err(dwc->dev, "request %p was not queued to %s\n", 1019 request, ep->name); 1020 ret = -EINVAL; 1021 goto out0; 1022 } 1023 1024 /* giveback the request */ 1025 dwc3_gadget_giveback(dep, req, -ECONNRESET); 1026 1027out0: 1028 spin_unlock_irqrestore(&dwc->lock, flags); 1029 1030 return ret; 1031} 1032 1033int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value) 1034{ 1035 struct dwc3_gadget_ep_cmd_params params; 1036 struct dwc3 *dwc = dep->dwc; 1037 int ret; 1038 1039 memset(¶ms, 0x00, sizeof(params)); 1040 1041 if (value) { 1042 if (dep->number == 0 || dep->number == 1) { 1043 /* 1044 * Whenever EP0 is stalled, we will restart 1045 * the state machine, thus moving back to 1046 * Setup Phase 1047 */ 1048 dwc->ep0state = EP0_SETUP_PHASE; 1049 } 1050 1051 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, 1052 DWC3_DEPCMD_SETSTALL, ¶ms); 1053 if (ret) 1054 dev_err(dwc->dev, "failed to %s STALL on %s\n", 1055 value ? "set" : "clear", 1056 dep->name); 1057 else 1058 dep->flags |= DWC3_EP_STALL; 1059 } else { 1060 if (dep->flags & DWC3_EP_WEDGE) 1061 return 0; 1062 1063 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, 1064 DWC3_DEPCMD_CLEARSTALL, ¶ms); 1065 if (ret) 1066 dev_err(dwc->dev, "failed to %s STALL on %s\n", 1067 value ? "set" : "clear", 1068 dep->name); 1069 else 1070 dep->flags &= ~DWC3_EP_STALL; 1071 } 1072 1073 return ret; 1074} 1075 1076static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value) 1077{ 1078 struct dwc3_ep *dep = to_dwc3_ep(ep); 1079 struct dwc3 *dwc = dep->dwc; 1080 1081 unsigned long flags; 1082 1083 int ret; 1084 1085 spin_lock_irqsave(&dwc->lock, flags); 1086 1087 if (usb_endpoint_xfer_isoc(dep->desc)) { 1088 dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name); 1089 ret = -EINVAL; 1090 goto out; 1091 } 1092 1093 ret = __dwc3_gadget_ep_set_halt(dep, value); 1094out: 1095 spin_unlock_irqrestore(&dwc->lock, flags); 1096 1097 return ret; 1098} 1099 1100static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep) 1101{ 1102 struct dwc3_ep *dep = to_dwc3_ep(ep); 1103 1104 dep->flags |= DWC3_EP_WEDGE; 1105 1106 return dwc3_gadget_ep_set_halt(ep, 1); 1107} 1108 1109/* -------------------------------------------------------------------------- */ 1110 1111static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = { 1112 .bLength = USB_DT_ENDPOINT_SIZE, 1113 .bDescriptorType = USB_DT_ENDPOINT, 1114 .bmAttributes = USB_ENDPOINT_XFER_CONTROL, 1115}; 1116 1117static const struct usb_ep_ops dwc3_gadget_ep0_ops = { 1118 .enable = dwc3_gadget_ep0_enable, 1119 .disable = dwc3_gadget_ep0_disable, 1120 .alloc_request = dwc3_gadget_ep_alloc_request, 1121 .free_request = dwc3_gadget_ep_free_request, 1122 .queue = dwc3_gadget_ep0_queue, 1123 .dequeue = dwc3_gadget_ep_dequeue, 1124 .set_halt = dwc3_gadget_ep_set_halt, 1125 .set_wedge = dwc3_gadget_ep_set_wedge, 1126}; 1127 1128static const struct usb_ep_ops dwc3_gadget_ep_ops = { 1129 .enable = dwc3_gadget_ep_enable, 1130 .disable = dwc3_gadget_ep_disable, 1131 .alloc_request = dwc3_gadget_ep_alloc_request, 1132 .free_request = dwc3_gadget_ep_free_request, 1133 .queue = dwc3_gadget_ep_queue, 1134 .dequeue = dwc3_gadget_ep_dequeue, 1135 .set_halt = dwc3_gadget_ep_set_halt, 1136 .set_wedge = dwc3_gadget_ep_set_wedge, 1137}; 1138 1139/* -------------------------------------------------------------------------- */ 1140 1141static int dwc3_gadget_get_frame(struct usb_gadget *g) 1142{ 1143 struct dwc3 *dwc = gadget_to_dwc(g); 1144 u32 reg; 1145 1146 reg = dwc3_readl(dwc->regs, DWC3_DSTS); 1147 return DWC3_DSTS_SOFFN(reg); 1148} 1149 1150static int dwc3_gadget_wakeup(struct usb_gadget *g) 1151{ 1152 struct dwc3 *dwc = gadget_to_dwc(g); 1153 1154 unsigned long timeout; 1155 unsigned long flags; 1156 1157 u32 reg; 1158 1159 int ret = 0; 1160 1161 u8 link_state; 1162 u8 speed; 1163 1164 spin_lock_irqsave(&dwc->lock, flags); 1165 1166 /* 1167 * According to the Databook Remote wakeup request should 1168 * be issued only when the device is in early suspend state. 1169 * 1170 * We can check that via USB Link State bits in DSTS register. 1171 */ 1172 reg = dwc3_readl(dwc->regs, DWC3_DSTS); 1173 1174 speed = reg & DWC3_DSTS_CONNECTSPD; 1175 if (speed == DWC3_DSTS_SUPERSPEED) { 1176 dev_dbg(dwc->dev, "no wakeup on SuperSpeed\n"); 1177 ret = -EINVAL; 1178 goto out; 1179 } 1180 1181 link_state = DWC3_DSTS_USBLNKST(reg); 1182 1183 switch (link_state) { 1184 case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */ 1185 case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */ 1186 break; 1187 default: 1188 dev_dbg(dwc->dev, "can't wakeup from link state %d\n", 1189 link_state); 1190 ret = -EINVAL; 1191 goto out; 1192 } 1193 1194 ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV); 1195 if (ret < 0) { 1196 dev_err(dwc->dev, "failed to put link in Recovery\n"); 1197 goto out; 1198 } 1199 1200 /* write zeroes to Link Change Request */ 1201 reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK; 1202 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 1203 1204 /* pool until Link State change to ON */ 1205 timeout = jiffies + msecs_to_jiffies(100); 1206 1207 while (!(time_after(jiffies, timeout))) { 1208 reg = dwc3_readl(dwc->regs, DWC3_DSTS); 1209 1210 /* in HS, means ON */ 1211 if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0) 1212 break; 1213 } 1214 1215 if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) { 1216 dev_err(dwc->dev, "failed to send remote wakeup\n"); 1217 ret = -EINVAL; 1218 } 1219 1220out: 1221 spin_unlock_irqrestore(&dwc->lock, flags); 1222 1223 return ret; 1224} 1225 1226static int dwc3_gadget_set_selfpowered(struct usb_gadget *g, 1227 int is_selfpowered) 1228{ 1229 struct dwc3 *dwc = gadget_to_dwc(g); 1230 1231 dwc->is_selfpowered = !!is_selfpowered; 1232 1233 return 0; 1234} 1235 1236static void dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on) 1237{ 1238 u32 reg; 1239 u32 timeout = 500; 1240 1241 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 1242 if (is_on) 1243 reg |= DWC3_DCTL_RUN_STOP; 1244 else 1245 reg &= ~DWC3_DCTL_RUN_STOP; 1246 1247 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 1248 1249 do { 1250 reg = dwc3_readl(dwc->regs, DWC3_DSTS); 1251 if (is_on) { 1252 if (!(reg & DWC3_DSTS_DEVCTRLHLT)) 1253 break; 1254 } else { 1255 if (reg & DWC3_DSTS_DEVCTRLHLT) 1256 break; 1257 } 1258 timeout--; 1259 if (!timeout) 1260 break; 1261 udelay(1); 1262 } while (1); 1263 1264 dev_vdbg(dwc->dev, "gadget %s data soft-%s\n", 1265 dwc->gadget_driver 1266 ? dwc->gadget_driver->function : "no-function", 1267 is_on ? "connect" : "disconnect"); 1268} 1269 1270static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on) 1271{ 1272 struct dwc3 *dwc = gadget_to_dwc(g); 1273 unsigned long flags; 1274 1275 is_on = !!is_on; 1276 1277 spin_lock_irqsave(&dwc->lock, flags); 1278 dwc3_gadget_run_stop(dwc, is_on); 1279 spin_unlock_irqrestore(&dwc->lock, flags); 1280 1281 return 0; 1282} 1283 1284static int dwc3_gadget_start(struct usb_gadget *g, 1285 struct usb_gadget_driver *driver) 1286{ 1287 struct dwc3 *dwc = gadget_to_dwc(g); 1288 struct dwc3_ep *dep; 1289 unsigned long flags; 1290 int ret = 0; 1291 u32 reg; 1292 1293 spin_lock_irqsave(&dwc->lock, flags); 1294 1295 if (dwc->gadget_driver) { 1296 dev_err(dwc->dev, "%s is already bound to %s\n", 1297 dwc->gadget.name, 1298 dwc->gadget_driver->driver.name); 1299 ret = -EBUSY; 1300 goto err0; 1301 } 1302 1303 dwc->gadget_driver = driver; 1304 dwc->gadget.dev.driver = &driver->driver; 1305 1306 reg = dwc3_readl(dwc->regs, DWC3_DCFG); 1307 reg &= ~(DWC3_DCFG_SPEED_MASK); 1308 reg |= dwc->maximum_speed; 1309 dwc3_writel(dwc->regs, DWC3_DCFG, reg); 1310 1311 dwc->start_config_issued = false; 1312 1313 /* Start with SuperSpeed Default */ 1314 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512); 1315 1316 dep = dwc->eps[0]; 1317 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL); 1318 if (ret) { 1319 dev_err(dwc->dev, "failed to enable %s\n", dep->name); 1320 goto err0; 1321 } 1322 1323 dep = dwc->eps[1]; 1324 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL); 1325 if (ret) { 1326 dev_err(dwc->dev, "failed to enable %s\n", dep->name); 1327 goto err1; 1328 } 1329 1330 /* begin to receive SETUP packets */ 1331 dwc->ep0state = EP0_SETUP_PHASE; 1332 dwc3_ep0_out_start(dwc); 1333 1334 spin_unlock_irqrestore(&dwc->lock, flags); 1335 1336 return 0; 1337 1338err1: 1339 __dwc3_gadget_ep_disable(dwc->eps[0]); 1340 1341err0: 1342 spin_unlock_irqrestore(&dwc->lock, flags); 1343 1344 return ret; 1345} 1346 1347static int dwc3_gadget_stop(struct usb_gadget *g, 1348 struct usb_gadget_driver *driver) 1349{ 1350 struct dwc3 *dwc = gadget_to_dwc(g); 1351 unsigned long flags; 1352 1353 spin_lock_irqsave(&dwc->lock, flags); 1354 1355 __dwc3_gadget_ep_disable(dwc->eps[0]); 1356 __dwc3_gadget_ep_disable(dwc->eps[1]); 1357 1358 dwc->gadget_driver = NULL; 1359 dwc->gadget.dev.driver = NULL; 1360 1361 spin_unlock_irqrestore(&dwc->lock, flags); 1362 1363 return 0; 1364} 1365static const struct usb_gadget_ops dwc3_gadget_ops = { 1366 .get_frame = dwc3_gadget_get_frame, 1367 .wakeup = dwc3_gadget_wakeup, 1368 .set_selfpowered = dwc3_gadget_set_selfpowered, 1369 .pullup = dwc3_gadget_pullup, 1370 .udc_start = dwc3_gadget_start, 1371 .udc_stop = dwc3_gadget_stop, 1372}; 1373 1374/* -------------------------------------------------------------------------- */ 1375 1376static int __devinit dwc3_gadget_init_endpoints(struct dwc3 *dwc) 1377{ 1378 struct dwc3_ep *dep; 1379 u8 epnum; 1380 1381 INIT_LIST_HEAD(&dwc->gadget.ep_list); 1382 1383 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) { 1384 dep = kzalloc(sizeof(*dep), GFP_KERNEL); 1385 if (!dep) { 1386 dev_err(dwc->dev, "can't allocate endpoint %d\n", 1387 epnum); 1388 return -ENOMEM; 1389 } 1390 1391 dep->dwc = dwc; 1392 dep->number = epnum; 1393 dwc->eps[epnum] = dep; 1394 1395 snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1, 1396 (epnum & 1) ? "in" : "out"); 1397 dep->endpoint.name = dep->name; 1398 dep->direction = (epnum & 1); 1399 1400 if (epnum == 0 || epnum == 1) { 1401 dep->endpoint.maxpacket = 512; 1402 dep->endpoint.ops = &dwc3_gadget_ep0_ops; 1403 if (!epnum) 1404 dwc->gadget.ep0 = &dep->endpoint; 1405 } else { 1406 int ret; 1407 1408 dep->endpoint.maxpacket = 1024; 1409 dep->endpoint.max_streams = 15; 1410 dep->endpoint.ops = &dwc3_gadget_ep_ops; 1411 list_add_tail(&dep->endpoint.ep_list, 1412 &dwc->gadget.ep_list); 1413 1414 ret = dwc3_alloc_trb_pool(dep); 1415 if (ret) 1416 return ret; 1417 } 1418 1419 INIT_LIST_HEAD(&dep->request_list); 1420 INIT_LIST_HEAD(&dep->req_queued); 1421 } 1422 1423 return 0; 1424} 1425 1426static void dwc3_gadget_free_endpoints(struct dwc3 *dwc) 1427{ 1428 struct dwc3_ep *dep; 1429 u8 epnum; 1430 1431 for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) { 1432 dep = dwc->eps[epnum]; 1433 dwc3_free_trb_pool(dep); 1434 1435 if (epnum != 0 && epnum != 1) 1436 list_del(&dep->endpoint.ep_list); 1437 1438 kfree(dep); 1439 } 1440} 1441 1442static void dwc3_gadget_release(struct device *dev) 1443{ 1444 dev_dbg(dev, "%s\n", __func__); 1445} 1446 1447/* -------------------------------------------------------------------------- */ 1448static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep, 1449 const struct dwc3_event_depevt *event, int status) 1450{ 1451 struct dwc3_request *req; 1452 struct dwc3_trb trb; 1453 unsigned int count; 1454 unsigned int s_pkt = 0; 1455 1456 do { 1457 req = next_request(&dep->req_queued); 1458 if (!req) { 1459 WARN_ON_ONCE(1); 1460 return 1; 1461 } 1462 1463 dwc3_trb_to_nat(req->trb, &trb); 1464 1465 if (trb.hwo && status != -ESHUTDOWN) 1466 /* 1467 * We continue despite the error. There is not much we 1468 * can do. If we don't clean in up we loop for ever. If 1469 * we skip the TRB than it gets overwritten reused after 1470 * a while since we use them in a ring buffer. a BUG() 1471 * would help. Lets hope that if this occures, someone 1472 * fixes the root cause instead of looking away :) 1473 */ 1474 dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n", 1475 dep->name, req->trb); 1476 count = trb.length; 1477 1478 if (dep->direction) { 1479 if (count) { 1480 dev_err(dwc->dev, "incomplete IN transfer %s\n", 1481 dep->name); 1482 status = -ECONNRESET; 1483 } 1484 } else { 1485 if (count && (event->status & DEPEVT_STATUS_SHORT)) 1486 s_pkt = 1; 1487 } 1488 1489 /* 1490 * We assume here we will always receive the entire data block 1491 * which we should receive. Meaning, if we program RX to 1492 * receive 4K but we receive only 2K, we assume that's all we 1493 * should receive and we simply bounce the request back to the 1494 * gadget driver for further processing. 1495 */ 1496 req->request.actual += req->request.length - count; 1497 dwc3_gadget_giveback(dep, req, status); 1498 if (s_pkt) 1499 break; 1500 if ((event->status & DEPEVT_STATUS_LST) && trb.lst) 1501 break; 1502 if ((event->status & DEPEVT_STATUS_IOC) && trb.ioc) 1503 break; 1504 } while (1); 1505 1506 if ((event->status & DEPEVT_STATUS_IOC) && trb.ioc) 1507 return 0; 1508 return 1; 1509} 1510 1511static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc, 1512 struct dwc3_ep *dep, const struct dwc3_event_depevt *event, 1513 int start_new) 1514{ 1515 unsigned status = 0; 1516 int clean_busy; 1517 1518 if (event->status & DEPEVT_STATUS_BUSERR) 1519 status = -ECONNRESET; 1520 1521 clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status); 1522 if (clean_busy) { 1523 dep->flags &= ~DWC3_EP_BUSY; 1524 dep->res_trans_idx = 0; 1525 } 1526 1527 /* 1528 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround. 1529 * See dwc3_gadget_linksts_change_interrupt() for 1st half. 1530 */ 1531 if (dwc->revision < DWC3_REVISION_183A) { 1532 u32 reg; 1533 int i; 1534 1535 for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) { 1536 struct dwc3_ep *dep = dwc->eps[i]; 1537 1538 if (!(dep->flags & DWC3_EP_ENABLED)) 1539 continue; 1540 1541 if (!list_empty(&dep->req_queued)) 1542 return; 1543 } 1544 1545 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 1546 reg |= dwc->u1u2; 1547 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 1548 1549 dwc->u1u2 = 0; 1550 } 1551} 1552 1553static void dwc3_gadget_start_isoc(struct dwc3 *dwc, 1554 struct dwc3_ep *dep, const struct dwc3_event_depevt *event) 1555{ 1556 u32 uf; 1557 1558 if (list_empty(&dep->request_list)) { 1559 dev_vdbg(dwc->dev, "ISOC ep %s run out for requests.\n", 1560 dep->name); 1561 return; 1562 } 1563 1564 if (event->parameters) { 1565 u32 mask; 1566 1567 mask = ~(dep->interval - 1); 1568 uf = event->parameters & mask; 1569 /* 4 micro frames in the future */ 1570 uf += dep->interval * 4; 1571 } else { 1572 uf = 0; 1573 } 1574 1575 __dwc3_gadget_kick_transfer(dep, uf, 1); 1576} 1577 1578static void dwc3_process_ep_cmd_complete(struct dwc3_ep *dep, 1579 const struct dwc3_event_depevt *event) 1580{ 1581 struct dwc3 *dwc = dep->dwc; 1582 struct dwc3_event_depevt mod_ev = *event; 1583 1584 /* 1585 * We were asked to remove one requests. It is possible that this 1586 * request and a few other were started together and have the same 1587 * transfer index. Since we stopped the complete endpoint we don't 1588 * know how many requests were already completed (and not yet) 1589 * reported and how could be done (later). We purge them all until 1590 * the end of the list. 1591 */ 1592 mod_ev.status = DEPEVT_STATUS_LST; 1593 dwc3_cleanup_done_reqs(dwc, dep, &mod_ev, -ESHUTDOWN); 1594 dep->flags &= ~DWC3_EP_BUSY; 1595 /* pending requets are ignored and are queued on XferNotReady */ 1596} 1597 1598static void dwc3_ep_cmd_compl(struct dwc3_ep *dep, 1599 const struct dwc3_event_depevt *event) 1600{ 1601 u32 param = event->parameters; 1602 u32 cmd_type = (param >> 8) & ((1 << 5) - 1); 1603 1604 switch (cmd_type) { 1605 case DWC3_DEPCMD_ENDTRANSFER: 1606 dwc3_process_ep_cmd_complete(dep, event); 1607 break; 1608 case DWC3_DEPCMD_STARTTRANSFER: 1609 dep->res_trans_idx = param & 0x7f; 1610 break; 1611 default: 1612 printk(KERN_ERR "%s() unknown /unexpected type: %d\n", 1613 __func__, cmd_type); 1614 break; 1615 }; 1616} 1617 1618static void dwc3_endpoint_interrupt(struct dwc3 *dwc, 1619 const struct dwc3_event_depevt *event) 1620{ 1621 struct dwc3_ep *dep; 1622 u8 epnum = event->endpoint_number; 1623 1624 dep = dwc->eps[epnum]; 1625 1626 dev_vdbg(dwc->dev, "%s: %s\n", dep->name, 1627 dwc3_ep_event_string(event->endpoint_event)); 1628 1629 if (epnum == 0 || epnum == 1) { 1630 dwc3_ep0_interrupt(dwc, event); 1631 return; 1632 } 1633 1634 switch (event->endpoint_event) { 1635 case DWC3_DEPEVT_XFERCOMPLETE: 1636 if (usb_endpoint_xfer_isoc(dep->desc)) { 1637 dev_dbg(dwc->dev, "%s is an Isochronous endpoint\n", 1638 dep->name); 1639 return; 1640 } 1641 1642 dwc3_endpoint_transfer_complete(dwc, dep, event, 1); 1643 break; 1644 case DWC3_DEPEVT_XFERINPROGRESS: 1645 if (!usb_endpoint_xfer_isoc(dep->desc)) { 1646 dev_dbg(dwc->dev, "%s is not an Isochronous endpoint\n", 1647 dep->name); 1648 return; 1649 } 1650 1651 dwc3_endpoint_transfer_complete(dwc, dep, event, 0); 1652 break; 1653 case DWC3_DEPEVT_XFERNOTREADY: 1654 if (usb_endpoint_xfer_isoc(dep->desc)) { 1655 dwc3_gadget_start_isoc(dwc, dep, event); 1656 } else { 1657 int ret; 1658 1659 dev_vdbg(dwc->dev, "%s: reason %s\n", 1660 dep->name, event->status 1661 ? "Transfer Active" 1662 : "Transfer Not Active"); 1663 1664 ret = __dwc3_gadget_kick_transfer(dep, 0, 1); 1665 if (!ret || ret == -EBUSY) 1666 return; 1667 1668 dev_dbg(dwc->dev, "%s: failed to kick transfers\n", 1669 dep->name); 1670 } 1671 1672 break; 1673 case DWC3_DEPEVT_STREAMEVT: 1674 if (!usb_endpoint_xfer_bulk(dep->desc)) { 1675 dev_err(dwc->dev, "Stream event for non-Bulk %s\n", 1676 dep->name); 1677 return; 1678 } 1679 1680 switch (event->status) { 1681 case DEPEVT_STREAMEVT_FOUND: 1682 dev_vdbg(dwc->dev, "Stream %d found and started\n", 1683 event->parameters); 1684 1685 break; 1686 case DEPEVT_STREAMEVT_NOTFOUND: 1687 /* FALLTHROUGH */ 1688 default: 1689 dev_dbg(dwc->dev, "Couldn't find suitable stream\n"); 1690 } 1691 break; 1692 case DWC3_DEPEVT_RXTXFIFOEVT: 1693 dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name); 1694 break; 1695 case DWC3_DEPEVT_EPCMDCMPLT: 1696 dwc3_ep_cmd_compl(dep, event); 1697 break; 1698 } 1699} 1700 1701static void dwc3_disconnect_gadget(struct dwc3 *dwc) 1702{ 1703 if (dwc->gadget_driver && dwc->gadget_driver->disconnect) { 1704 spin_unlock(&dwc->lock); 1705 dwc->gadget_driver->disconnect(&dwc->gadget); 1706 spin_lock(&dwc->lock); 1707 } 1708} 1709 1710static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum) 1711{ 1712 struct dwc3_ep *dep; 1713 struct dwc3_gadget_ep_cmd_params params; 1714 u32 cmd; 1715 int ret; 1716 1717 dep = dwc->eps[epnum]; 1718 1719 WARN_ON(!dep->res_trans_idx); 1720 if (dep->res_trans_idx) { 1721 cmd = DWC3_DEPCMD_ENDTRANSFER; 1722 cmd |= DWC3_DEPCMD_HIPRI_FORCERM | DWC3_DEPCMD_CMDIOC; 1723 cmd |= DWC3_DEPCMD_PARAM(dep->res_trans_idx); 1724 memset(¶ms, 0, sizeof(params)); 1725 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms); 1726 WARN_ON_ONCE(ret); 1727 dep->res_trans_idx = 0; 1728 } 1729} 1730 1731static void dwc3_stop_active_transfers(struct dwc3 *dwc) 1732{ 1733 u32 epnum; 1734 1735 for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) { 1736 struct dwc3_ep *dep; 1737 1738 dep = dwc->eps[epnum]; 1739 if (!(dep->flags & DWC3_EP_ENABLED)) 1740 continue; 1741 1742 dwc3_remove_requests(dwc, dep); 1743 } 1744} 1745 1746static void dwc3_clear_stall_all_ep(struct dwc3 *dwc) 1747{ 1748 u32 epnum; 1749 1750 for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) { 1751 struct dwc3_ep *dep; 1752 struct dwc3_gadget_ep_cmd_params params; 1753 int ret; 1754 1755 dep = dwc->eps[epnum]; 1756 1757 if (!(dep->flags & DWC3_EP_STALL)) 1758 continue; 1759 1760 dep->flags &= ~DWC3_EP_STALL; 1761 1762 memset(¶ms, 0, sizeof(params)); 1763 ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, 1764 DWC3_DEPCMD_CLEARSTALL, ¶ms); 1765 WARN_ON_ONCE(ret); 1766 } 1767} 1768 1769static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc) 1770{ 1771 dev_vdbg(dwc->dev, "%s\n", __func__); 1772#if 0 1773 XXX 1774 U1/U2 is powersave optimization. Skip it for now. Anyway we need to 1775 enable it before we can disable it. 1776 1777 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 1778 reg &= ~DWC3_DCTL_INITU1ENA; 1779 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 1780 1781 reg &= ~DWC3_DCTL_INITU2ENA; 1782 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 1783#endif 1784 1785 dwc3_stop_active_transfers(dwc); 1786 dwc3_disconnect_gadget(dwc); 1787 dwc->start_config_issued = false; 1788 1789 dwc->gadget.speed = USB_SPEED_UNKNOWN; 1790 dwc->setup_packet_pending = false; 1791} 1792 1793static void dwc3_gadget_usb3_phy_power(struct dwc3 *dwc, int on) 1794{ 1795 u32 reg; 1796 1797 reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0)); 1798 1799 if (on) 1800 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY; 1801 else 1802 reg |= DWC3_GUSB3PIPECTL_SUSPHY; 1803 1804 dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg); 1805} 1806 1807static void dwc3_gadget_usb2_phy_power(struct dwc3 *dwc, int on) 1808{ 1809 u32 reg; 1810 1811 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 1812 1813 if (on) 1814 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; 1815 else 1816 reg |= DWC3_GUSB2PHYCFG_SUSPHY; 1817 1818 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 1819} 1820 1821static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc) 1822{ 1823 u32 reg; 1824 1825 dev_vdbg(dwc->dev, "%s\n", __func__); 1826 1827 /* 1828 * WORKAROUND: DWC3 revisions <1.88a have an issue which 1829 * would cause a missing Disconnect Event if there's a 1830 * pending Setup Packet in the FIFO. 1831 * 1832 * There's no suggested workaround on the official Bug 1833 * report, which states that "unless the driver/application 1834 * is doing any special handling of a disconnect event, 1835 * there is no functional issue". 1836 * 1837 * Unfortunately, it turns out that we _do_ some special 1838 * handling of a disconnect event, namely complete all 1839 * pending transfers, notify gadget driver of the 1840 * disconnection, and so on. 1841 * 1842 * Our suggested workaround is to follow the Disconnect 1843 * Event steps here, instead, based on a setup_packet_pending 1844 * flag. Such flag gets set whenever we have a XferNotReady 1845 * event on EP0 and gets cleared on XferComplete for the 1846 * same endpoint. 1847 * 1848 * Refers to: 1849 * 1850 * STAR#9000466709: RTL: Device : Disconnect event not 1851 * generated if setup packet pending in FIFO 1852 */ 1853 if (dwc->revision < DWC3_REVISION_188A) { 1854 if (dwc->setup_packet_pending) 1855 dwc3_gadget_disconnect_interrupt(dwc); 1856 } 1857 1858 /* after reset -> Default State */ 1859 dwc->dev_state = DWC3_DEFAULT_STATE; 1860 1861 /* Enable PHYs */ 1862 dwc3_gadget_usb2_phy_power(dwc, true); 1863 dwc3_gadget_usb3_phy_power(dwc, true); 1864 1865 if (dwc->gadget.speed != USB_SPEED_UNKNOWN) 1866 dwc3_disconnect_gadget(dwc); 1867 1868 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 1869 reg &= ~DWC3_DCTL_TSTCTRL_MASK; 1870 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 1871 1872 dwc3_stop_active_transfers(dwc); 1873 dwc3_clear_stall_all_ep(dwc); 1874 dwc->start_config_issued = false; 1875 1876 /* Reset device address to zero */ 1877 reg = dwc3_readl(dwc->regs, DWC3_DCFG); 1878 reg &= ~(DWC3_DCFG_DEVADDR_MASK); 1879 dwc3_writel(dwc->regs, DWC3_DCFG, reg); 1880} 1881 1882static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed) 1883{ 1884 u32 reg; 1885 u32 usb30_clock = DWC3_GCTL_CLK_BUS; 1886 1887 /* 1888 * We change the clock only at SS but I dunno why I would want to do 1889 * this. Maybe it becomes part of the power saving plan. 1890 */ 1891 1892 if (speed != DWC3_DSTS_SUPERSPEED) 1893 return; 1894 1895 /* 1896 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed 1897 * each time on Connect Done. 1898 */ 1899 if (!usb30_clock) 1900 return; 1901 1902 reg = dwc3_readl(dwc->regs, DWC3_GCTL); 1903 reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock); 1904 dwc3_writel(dwc->regs, DWC3_GCTL, reg); 1905} 1906 1907static void dwc3_gadget_disable_phy(struct dwc3 *dwc, u8 speed) 1908{ 1909 switch (speed) { 1910 case USB_SPEED_SUPER: 1911 dwc3_gadget_usb2_phy_power(dwc, false); 1912 break; 1913 case USB_SPEED_HIGH: 1914 case USB_SPEED_FULL: 1915 case USB_SPEED_LOW: 1916 dwc3_gadget_usb3_phy_power(dwc, false); 1917 break; 1918 } 1919} 1920 1921static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) 1922{ 1923 struct dwc3_gadget_ep_cmd_params params; 1924 struct dwc3_ep *dep; 1925 int ret; 1926 u32 reg; 1927 u8 speed; 1928 1929 dev_vdbg(dwc->dev, "%s\n", __func__); 1930 1931 memset(¶ms, 0x00, sizeof(params)); 1932 1933 reg = dwc3_readl(dwc->regs, DWC3_DSTS); 1934 speed = reg & DWC3_DSTS_CONNECTSPD; 1935 dwc->speed = speed; 1936 1937 dwc3_update_ram_clk_sel(dwc, speed); 1938 1939 switch (speed) { 1940 case DWC3_DCFG_SUPERSPEED: 1941 /* 1942 * WORKAROUND: DWC3 revisions <1.90a have an issue which 1943 * would cause a missing USB3 Reset event. 1944 * 1945 * In such situations, we should force a USB3 Reset 1946 * event by calling our dwc3_gadget_reset_interrupt() 1947 * routine. 1948 * 1949 * Refers to: 1950 * 1951 * STAR#9000483510: RTL: SS : USB3 reset event may 1952 * not be generated always when the link enters poll 1953 */ 1954 if (dwc->revision < DWC3_REVISION_190A) 1955 dwc3_gadget_reset_interrupt(dwc); 1956 1957 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512); 1958 dwc->gadget.ep0->maxpacket = 512; 1959 dwc->gadget.speed = USB_SPEED_SUPER; 1960 break; 1961 case DWC3_DCFG_HIGHSPEED: 1962 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64); 1963 dwc->gadget.ep0->maxpacket = 64; 1964 dwc->gadget.speed = USB_SPEED_HIGH; 1965 break; 1966 case DWC3_DCFG_FULLSPEED2: 1967 case DWC3_DCFG_FULLSPEED1: 1968 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64); 1969 dwc->gadget.ep0->maxpacket = 64; 1970 dwc->gadget.speed = USB_SPEED_FULL; 1971 break; 1972 case DWC3_DCFG_LOWSPEED: 1973 dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8); 1974 dwc->gadget.ep0->maxpacket = 8; 1975 dwc->gadget.speed = USB_SPEED_LOW; 1976 break; 1977 } 1978 1979 /* Disable unneded PHY */ 1980 dwc3_gadget_disable_phy(dwc, dwc->gadget.speed); 1981 1982 dep = dwc->eps[0]; 1983 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL); 1984 if (ret) { 1985 dev_err(dwc->dev, "failed to enable %s\n", dep->name); 1986 return; 1987 } 1988 1989 dep = dwc->eps[1]; 1990 ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL); 1991 if (ret) { 1992 dev_err(dwc->dev, "failed to enable %s\n", dep->name); 1993 return; 1994 } 1995 1996 /* 1997 * Configure PHY via GUSB3PIPECTLn if required. 1998 * 1999 * Update GTXFIFOSIZn 2000 * 2001 * In both cases reset values should be sufficient. 2002 */ 2003} 2004 2005static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc) 2006{ 2007 dev_vdbg(dwc->dev, "%s\n", __func__); 2008 2009 /* 2010 * TODO take core out of low power mode when that's 2011 * implemented. 2012 */ 2013 2014 dwc->gadget_driver->resume(&dwc->gadget); 2015} 2016 2017static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc, 2018 unsigned int evtinfo) 2019{ 2020 enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK; 2021 2022 /* 2023 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending 2024 * on the link partner, the USB session might do multiple entry/exit 2025 * of low power states before a transfer takes place. 2026 * 2027 * Due to this problem, we might experience lower throughput. The 2028 * suggested workaround is to disable DCTL[12:9] bits if we're 2029 * transitioning from U1/U2 to U0 and enable those bits again 2030 * after a transfer completes and there are no pending transfers 2031 * on any of the enabled endpoints. 2032 * 2033 * This is the first half of that workaround. 2034 * 2035 * Refers to: 2036 * 2037 * STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us 2038 * core send LGO_Ux entering U0 2039 */ 2040 if (dwc->revision < DWC3_REVISION_183A) { 2041 if (next == DWC3_LINK_STATE_U0) { 2042 u32 u1u2; 2043 u32 reg; 2044 2045 switch (dwc->link_state) { 2046 case DWC3_LINK_STATE_U1: 2047 case DWC3_LINK_STATE_U2: 2048 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 2049 u1u2 = reg & (DWC3_DCTL_INITU2ENA 2050 | DWC3_DCTL_ACCEPTU2ENA 2051 | DWC3_DCTL_INITU1ENA 2052 | DWC3_DCTL_ACCEPTU1ENA); 2053 2054 if (!dwc->u1u2) 2055 dwc->u1u2 = reg & u1u2; 2056 2057 reg &= ~u1u2; 2058 2059 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 2060 break; 2061 default: 2062 /* do nothing */ 2063 break; 2064 } 2065 } 2066 } 2067 2068 dwc->link_state = next; 2069 2070 dev_vdbg(dwc->dev, "%s link %d\n", __func__, dwc->link_state); 2071} 2072 2073static void dwc3_gadget_interrupt(struct dwc3 *dwc, 2074 const struct dwc3_event_devt *event) 2075{ 2076 switch (event->type) { 2077 case DWC3_DEVICE_EVENT_DISCONNECT: 2078 dwc3_gadget_disconnect_interrupt(dwc); 2079 break; 2080 case DWC3_DEVICE_EVENT_RESET: 2081 dwc3_gadget_reset_interrupt(dwc); 2082 break; 2083 case DWC3_DEVICE_EVENT_CONNECT_DONE: 2084 dwc3_gadget_conndone_interrupt(dwc); 2085 break; 2086 case DWC3_DEVICE_EVENT_WAKEUP: 2087 dwc3_gadget_wakeup_interrupt(dwc); 2088 break; 2089 case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE: 2090 dwc3_gadget_linksts_change_interrupt(dwc, event->event_info); 2091 break; 2092 case DWC3_DEVICE_EVENT_EOPF: 2093 dev_vdbg(dwc->dev, "End of Periodic Frame\n"); 2094 break; 2095 case DWC3_DEVICE_EVENT_SOF: 2096 dev_vdbg(dwc->dev, "Start of Periodic Frame\n"); 2097 break; 2098 case DWC3_DEVICE_EVENT_ERRATIC_ERROR: 2099 dev_vdbg(dwc->dev, "Erratic Error\n"); 2100 break; 2101 case DWC3_DEVICE_EVENT_CMD_CMPL: 2102 dev_vdbg(dwc->dev, "Command Complete\n"); 2103 break; 2104 case DWC3_DEVICE_EVENT_OVERFLOW: 2105 dev_vdbg(dwc->dev, "Overflow\n"); 2106 break; 2107 default: 2108 dev_dbg(dwc->dev, "UNKNOWN IRQ %d\n", event->type); 2109 } 2110} 2111 2112static void dwc3_process_event_entry(struct dwc3 *dwc, 2113 const union dwc3_event *event) 2114{ 2115 /* Endpoint IRQ, handle it and return early */ 2116 if (event->type.is_devspec == 0) { 2117 /* depevt */ 2118 return dwc3_endpoint_interrupt(dwc, &event->depevt); 2119 } 2120 2121 switch (event->type.type) { 2122 case DWC3_EVENT_TYPE_DEV: 2123 dwc3_gadget_interrupt(dwc, &event->devt); 2124 break; 2125 /* REVISIT what to do with Carkit and I2C events ? */ 2126 default: 2127 dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw); 2128 } 2129} 2130 2131static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf) 2132{ 2133 struct dwc3_event_buffer *evt; 2134 int left; 2135 u32 count; 2136 2137 count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf)); 2138 count &= DWC3_GEVNTCOUNT_MASK; 2139 if (!count) 2140 return IRQ_NONE; 2141 2142 evt = dwc->ev_buffs[buf]; 2143 left = count; 2144 2145 while (left > 0) { 2146 union dwc3_event event; 2147 2148 memcpy(&event.raw, (evt->buf + evt->lpos), sizeof(event.raw)); 2149 dwc3_process_event_entry(dwc, &event); 2150 /* 2151 * XXX we wrap around correctly to the next entry as almost all 2152 * entries are 4 bytes in size. There is one entry which has 12 2153 * bytes which is a regular entry followed by 8 bytes data. ATM 2154 * I don't know how things are organized if were get next to the 2155 * a boundary so I worry about that once we try to handle that. 2156 */ 2157 evt->lpos = (evt->lpos + 4) % DWC3_EVENT_BUFFERS_SIZE; 2158 left -= 4; 2159 2160 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(buf), 4); 2161 } 2162 2163 return IRQ_HANDLED; 2164} 2165 2166static irqreturn_t dwc3_interrupt(int irq, void *_dwc) 2167{ 2168 struct dwc3 *dwc = _dwc; 2169 int i; 2170 irqreturn_t ret = IRQ_NONE; 2171 2172 spin_lock(&dwc->lock); 2173 2174 for (i = 0; i < dwc->num_event_buffers; i++) { 2175 irqreturn_t status; 2176 2177 status = dwc3_process_event_buf(dwc, i); 2178 if (status == IRQ_HANDLED) 2179 ret = status; 2180 } 2181 2182 spin_unlock(&dwc->lock); 2183 2184 return ret; 2185} 2186 2187/** 2188 * dwc3_gadget_init - Initializes gadget related registers 2189 * @dwc: Pointer to out controller context structure 2190 * 2191 * Returns 0 on success otherwise negative errno. 2192 */ 2193int __devinit dwc3_gadget_init(struct dwc3 *dwc) 2194{ 2195 u32 reg; 2196 int ret; 2197 int irq; 2198 2199 dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req), 2200 &dwc->ctrl_req_addr, GFP_KERNEL); 2201 if (!dwc->ctrl_req) { 2202 dev_err(dwc->dev, "failed to allocate ctrl request\n"); 2203 ret = -ENOMEM; 2204 goto err0; 2205 } 2206 2207 dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb), 2208 &dwc->ep0_trb_addr, GFP_KERNEL); 2209 if (!dwc->ep0_trb) { 2210 dev_err(dwc->dev, "failed to allocate ep0 trb\n"); 2211 ret = -ENOMEM; 2212 goto err1; 2213 } 2214 2215 dwc->setup_buf = dma_alloc_coherent(dwc->dev, 2216 sizeof(*dwc->setup_buf) * 2, 2217 &dwc->setup_buf_addr, GFP_KERNEL); 2218 if (!dwc->setup_buf) { 2219 dev_err(dwc->dev, "failed to allocate setup buffer\n"); 2220 ret = -ENOMEM; 2221 goto err2; 2222 } 2223 2224 dwc->ep0_bounce = dma_alloc_coherent(dwc->dev, 2225 512, &dwc->ep0_bounce_addr, GFP_KERNEL); 2226 if (!dwc->ep0_bounce) { 2227 dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n"); 2228 ret = -ENOMEM; 2229 goto err3; 2230 } 2231 2232 dev_set_name(&dwc->gadget.dev, "gadget"); 2233 2234 dwc->gadget.ops = &dwc3_gadget_ops; 2235 dwc->gadget.max_speed = USB_SPEED_SUPER; 2236 dwc->gadget.speed = USB_SPEED_UNKNOWN; 2237 dwc->gadget.dev.parent = dwc->dev; 2238 dwc->gadget.sg_supported = true; 2239 2240 dma_set_coherent_mask(&dwc->gadget.dev, dwc->dev->coherent_dma_mask); 2241 2242 dwc->gadget.dev.dma_parms = dwc->dev->dma_parms; 2243 dwc->gadget.dev.dma_mask = dwc->dev->dma_mask; 2244 dwc->gadget.dev.release = dwc3_gadget_release; 2245 dwc->gadget.name = "dwc3-gadget"; 2246 2247 /* 2248 * REVISIT: Here we should clear all pending IRQs to be 2249 * sure we're starting from a well known location. 2250 */ 2251 2252 ret = dwc3_gadget_init_endpoints(dwc); 2253 if (ret) 2254 goto err4; 2255 2256 irq = platform_get_irq(to_platform_device(dwc->dev), 0); 2257 2258 ret = request_irq(irq, dwc3_interrupt, IRQF_SHARED, 2259 "dwc3", dwc); 2260 if (ret) { 2261 dev_err(dwc->dev, "failed to request irq #%d --> %d\n", 2262 irq, ret); 2263 goto err5; 2264 } 2265 2266 /* Enable all but Start and End of Frame IRQs */ 2267 reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN | 2268 DWC3_DEVTEN_EVNTOVERFLOWEN | 2269 DWC3_DEVTEN_CMDCMPLTEN | 2270 DWC3_DEVTEN_ERRTICERREN | 2271 DWC3_DEVTEN_WKUPEVTEN | 2272 DWC3_DEVTEN_ULSTCNGEN | 2273 DWC3_DEVTEN_CONNECTDONEEN | 2274 DWC3_DEVTEN_USBRSTEN | 2275 DWC3_DEVTEN_DISCONNEVTEN); 2276 dwc3_writel(dwc->regs, DWC3_DEVTEN, reg); 2277 2278 ret = device_register(&dwc->gadget.dev); 2279 if (ret) { 2280 dev_err(dwc->dev, "failed to register gadget device\n"); 2281 put_device(&dwc->gadget.dev); 2282 goto err6; 2283 } 2284 2285 ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget); 2286 if (ret) { 2287 dev_err(dwc->dev, "failed to register udc\n"); 2288 goto err7; 2289 } 2290 2291 return 0; 2292 2293err7: 2294 device_unregister(&dwc->gadget.dev); 2295 2296err6: 2297 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00); 2298 free_irq(irq, dwc); 2299 2300err5: 2301 dwc3_gadget_free_endpoints(dwc); 2302 2303err4: 2304 dma_free_coherent(dwc->dev, 512, dwc->ep0_bounce, 2305 dwc->ep0_bounce_addr); 2306 2307err3: 2308 dma_free_coherent(dwc->dev, sizeof(*dwc->setup_buf) * 2, 2309 dwc->setup_buf, dwc->setup_buf_addr); 2310 2311err2: 2312 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb), 2313 dwc->ep0_trb, dwc->ep0_trb_addr); 2314 2315err1: 2316 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req), 2317 dwc->ctrl_req, dwc->ctrl_req_addr); 2318 2319err0: 2320 return ret; 2321} 2322 2323void dwc3_gadget_exit(struct dwc3 *dwc) 2324{ 2325 int irq; 2326 2327 usb_del_gadget_udc(&dwc->gadget); 2328 irq = platform_get_irq(to_platform_device(dwc->dev), 0); 2329 2330 dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00); 2331 free_irq(irq, dwc); 2332 2333 dwc3_gadget_free_endpoints(dwc); 2334 2335 dma_free_coherent(dwc->dev, 512, dwc->ep0_bounce, 2336 dwc->ep0_bounce_addr); 2337 2338 dma_free_coherent(dwc->dev, sizeof(*dwc->setup_buf) * 2, 2339 dwc->setup_buf, dwc->setup_buf_addr); 2340 2341 dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb), 2342 dwc->ep0_trb, dwc->ep0_trb_addr); 2343 2344 dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req), 2345 dwc->ctrl_req, dwc->ctrl_req_addr); 2346 2347 device_unregister(&dwc->gadget.dev); 2348} 2349