1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2011 Marvell International Ltd. All rights reserved. 4 * Author: Chao Xie <chao.xie@marvell.com> 5 * Neil Zhang <zhangwm@marvell.com> 6 */ 7 8 #include <linux/module.h> 9 #include <linux/pci.h> 10 #include <linux/dma-mapping.h> 11 #include <linux/dmapool.h> 12 #include <linux/kernel.h> 13 #include <linux/delay.h> 14 #include <linux/ioport.h> 15 #include <linux/sched.h> 16 #include <linux/slab.h> 17 #include <linux/errno.h> 18 #include <linux/err.h> 19 #include <linux/timer.h> 20 #include <linux/list.h> 21 #include <linux/interrupt.h> 22 #include <linux/moduleparam.h> 23 #include <linux/device.h> 24 #include <linux/usb/ch9.h> 25 #include <linux/usb/gadget.h> 26 #include <linux/usb/otg.h> 27 #include <linux/pm.h> 28 #include <linux/io.h> 29 #include <linux/irq.h> 30 #include <linux/platform_device.h> 31 #include <linux/clk.h> 32 #include <linux/platform_data/mv_usb.h> 33 #include <asm/unaligned.h> 34 35 #include "mv_udc.h" 36 37 #define DRIVER_DESC "Marvell PXA USB Device Controller driver" 38 39 #define ep_dir(ep) (((ep)->ep_num == 0) ? \ 40 ((ep)->udc->ep0_dir) : ((ep)->direction)) 41 42 /* timeout value -- usec */ 43 #define RESET_TIMEOUT 10000 44 #define FLUSH_TIMEOUT 10000 45 #define EPSTATUS_TIMEOUT 10000 46 #define PRIME_TIMEOUT 10000 47 #define READSAFE_TIMEOUT 1000 48 49 #define LOOPS_USEC_SHIFT 1 50 #define LOOPS_USEC (1 << LOOPS_USEC_SHIFT) 51 #define LOOPS(timeout) ((timeout) >> LOOPS_USEC_SHIFT) 52 53 static DECLARE_COMPLETION(release_done); 54 55 static const char driver_name[] = "mv_udc"; 56 57 static void nuke(struct mv_ep *ep, int status); 58 static void stop_activity(struct mv_udc *udc, struct usb_gadget_driver *driver); 59 60 /* for endpoint 0 operations */ 61 static const struct usb_endpoint_descriptor mv_ep0_desc = { 62 .bLength = USB_DT_ENDPOINT_SIZE, 63 .bDescriptorType = USB_DT_ENDPOINT, 64 .bEndpointAddress = 0, 65 .bmAttributes = USB_ENDPOINT_XFER_CONTROL, 66 .wMaxPacketSize = EP0_MAX_PKT_SIZE, 67 }; 68 69 static void ep0_reset(struct mv_udc *udc) 70 { 71 struct mv_ep *ep; 72 u32 epctrlx; 73 int i = 0; 74 75 /* ep0 in and out */ 76 for (i = 0; i < 2; i++) { 77 ep = &udc->eps[i]; 78 ep->udc = udc; 79 80 /* ep0 dQH */ 81 ep->dqh = &udc->ep_dqh[i]; 82 83 /* configure ep0 endpoint capabilities in dQH */ 84 ep->dqh->max_packet_length = 85 (EP0_MAX_PKT_SIZE << EP_QUEUE_HEAD_MAX_PKT_LEN_POS) 86 | EP_QUEUE_HEAD_IOS; 87 88 ep->dqh->next_dtd_ptr = EP_QUEUE_HEAD_NEXT_TERMINATE; 89 90 epctrlx = readl(&udc->op_regs->epctrlx[0]); 91 if (i) { /* TX */ 92 epctrlx |= EPCTRL_TX_ENABLE 93 | (USB_ENDPOINT_XFER_CONTROL 94 << EPCTRL_TX_EP_TYPE_SHIFT); 95 96 } else { /* RX */ 97 epctrlx |= EPCTRL_RX_ENABLE 98 | (USB_ENDPOINT_XFER_CONTROL 99 << EPCTRL_RX_EP_TYPE_SHIFT); 100 } 101 102 writel(epctrlx, &udc->op_regs->epctrlx[0]); 103 } 104 } 105 106 /* protocol ep0 stall, will automatically be cleared on new transaction */ 107 static void ep0_stall(struct mv_udc *udc) 108 { 109 u32 epctrlx; 110 111 /* set TX and RX to stall */ 112 epctrlx = readl(&udc->op_regs->epctrlx[0]); 113 epctrlx |= EPCTRL_RX_EP_STALL | EPCTRL_TX_EP_STALL; 114 writel(epctrlx, &udc->op_regs->epctrlx[0]); 115 116 /* update ep0 state */ 117 udc->ep0_state = WAIT_FOR_SETUP; 118 udc->ep0_dir = EP_DIR_OUT; 119 } 120 121 static int process_ep_req(struct mv_udc *udc, int index, 122 struct mv_req *curr_req) 123 { 124 struct mv_dtd *curr_dtd; 125 struct mv_dqh *curr_dqh; 126 int actual, remaining_length; 127 int i, direction; 128 int retval = 0; 129 u32 errors; 130 u32 bit_pos; 131 132 curr_dqh = &udc->ep_dqh[index]; 133 direction = index % 2; 134 135 curr_dtd = curr_req->head; 136 actual = curr_req->req.length; 137 138 for (i = 0; i < curr_req->dtd_count; i++) { 139 if (curr_dtd->size_ioc_sts & DTD_STATUS_ACTIVE) { 140 dev_dbg(&udc->dev->dev, "%s, dTD not completed\n", 141 udc->eps[index].name); 142 return 1; 143 } 144 145 errors = curr_dtd->size_ioc_sts & DTD_ERROR_MASK; 146 if (!errors) { 147 remaining_length = 148 (curr_dtd->size_ioc_sts & DTD_PACKET_SIZE) 149 >> DTD_LENGTH_BIT_POS; 150 actual -= remaining_length; 151 152 if (remaining_length) { 153 if (direction) { 154 dev_dbg(&udc->dev->dev, 155 "TX dTD remains data\n"); 156 retval = -EPROTO; 157 break; 158 } else 159 break; 160 } 161 } else { 162 dev_info(&udc->dev->dev, 163 "complete_tr error: ep=%d %s: error = 0x%x\n", 164 index >> 1, direction ? "SEND" : "RECV", 165 errors); 166 if (errors & DTD_STATUS_HALTED) { 167 /* Clear the errors and Halt condition */ 168 curr_dqh->size_ioc_int_sts &= ~errors; 169 retval = -EPIPE; 170 } else if (errors & DTD_STATUS_DATA_BUFF_ERR) { 171 retval = -EPROTO; 172 } else if (errors & DTD_STATUS_TRANSACTION_ERR) { 173 retval = -EILSEQ; 174 } 175 } 176 if (i != curr_req->dtd_count - 1) 177 curr_dtd = (struct mv_dtd *)curr_dtd->next_dtd_virt; 178 } 179 if (retval) 180 return retval; 181 182 if (direction == EP_DIR_OUT) 183 bit_pos = 1 << curr_req->ep->ep_num; 184 else 185 bit_pos = 1 << (16 + curr_req->ep->ep_num); 186 187 while (curr_dqh->curr_dtd_ptr == curr_dtd->td_dma) { 188 if (curr_dtd->dtd_next == EP_QUEUE_HEAD_NEXT_TERMINATE) { 189 while (readl(&udc->op_regs->epstatus) & bit_pos) 190 udelay(1); 191 break; 192 } 193 udelay(1); 194 } 195 196 curr_req->req.actual = actual; 197 198 return 0; 199 } 200 201 /* 202 * done() - retire a request; caller blocked irqs 203 * @status : request status to be set, only works when 204 * request is still in progress. 205 */ 206 static void done(struct mv_ep *ep, struct mv_req *req, int status) 207 __releases(&ep->udc->lock) 208 __acquires(&ep->udc->lock) 209 { 210 struct mv_udc *udc = NULL; 211 unsigned char stopped = ep->stopped; 212 struct mv_dtd *curr_td, *next_td; 213 int j; 214 215 udc = (struct mv_udc *)ep->udc; 216 /* Removed the req from fsl_ep->queue */ 217 list_del_init(&req->queue); 218 219 /* req.status should be set as -EINPROGRESS in ep_queue() */ 220 if (req->req.status == -EINPROGRESS) 221 req->req.status = status; 222 else 223 status = req->req.status; 224 225 /* Free dtd for the request */ 226 next_td = req->head; 227 for (j = 0; j < req->dtd_count; j++) { 228 curr_td = next_td; 229 if (j != req->dtd_count - 1) 230 next_td = curr_td->next_dtd_virt; 231 dma_pool_free(udc->dtd_pool, curr_td, curr_td->td_dma); 232 } 233 234 usb_gadget_unmap_request(&udc->gadget, &req->req, ep_dir(ep)); 235 236 if (status && (status != -ESHUTDOWN)) 237 dev_info(&udc->dev->dev, "complete %s req %p stat %d len %u/%u", 238 ep->ep.name, &req->req, status, 239 req->req.actual, req->req.length); 240 241 ep->stopped = 1; 242 243 spin_unlock(&ep->udc->lock); 244 245 usb_gadget_giveback_request(&ep->ep, &req->req); 246 247 spin_lock(&ep->udc->lock); 248 ep->stopped = stopped; 249 } 250 251 static int queue_dtd(struct mv_ep *ep, struct mv_req *req) 252 { 253 struct mv_udc *udc; 254 struct mv_dqh *dqh; 255 u32 bit_pos, direction; 256 u32 usbcmd, epstatus; 257 unsigned int loops; 258 int retval = 0; 259 260 udc = ep->udc; 261 direction = ep_dir(ep); 262 dqh = &(udc->ep_dqh[ep->ep_num * 2 + direction]); 263 bit_pos = 1 << (((direction == EP_DIR_OUT) ? 0 : 16) + ep->ep_num); 264 265 /* check if the pipe is empty */ 266 if (!(list_empty(&ep->queue))) { 267 struct mv_req *lastreq; 268 lastreq = list_entry(ep->queue.prev, struct mv_req, queue); 269 lastreq->tail->dtd_next = 270 req->head->td_dma & EP_QUEUE_HEAD_NEXT_POINTER_MASK; 271 272 wmb(); 273 274 if (readl(&udc->op_regs->epprime) & bit_pos) 275 goto done; 276 277 loops = LOOPS(READSAFE_TIMEOUT); 278 while (1) { 279 /* start with setting the semaphores */ 280 usbcmd = readl(&udc->op_regs->usbcmd); 281 usbcmd |= USBCMD_ATDTW_TRIPWIRE_SET; 282 writel(usbcmd, &udc->op_regs->usbcmd); 283 284 /* read the endpoint status */ 285 epstatus = readl(&udc->op_regs->epstatus) & bit_pos; 286 287 /* 288 * Reread the ATDTW semaphore bit to check if it is 289 * cleared. When hardware see a hazard, it will clear 290 * the bit or else we remain set to 1 and we can 291 * proceed with priming of endpoint if not already 292 * primed. 293 */ 294 if (readl(&udc->op_regs->usbcmd) 295 & USBCMD_ATDTW_TRIPWIRE_SET) 296 break; 297 298 loops--; 299 if (loops == 0) { 300 dev_err(&udc->dev->dev, 301 "Timeout for ATDTW_TRIPWIRE...\n"); 302 retval = -ETIME; 303 goto done; 304 } 305 udelay(LOOPS_USEC); 306 } 307 308 /* Clear the semaphore */ 309 usbcmd = readl(&udc->op_regs->usbcmd); 310 usbcmd &= USBCMD_ATDTW_TRIPWIRE_CLEAR; 311 writel(usbcmd, &udc->op_regs->usbcmd); 312 313 if (epstatus) 314 goto done; 315 } 316 317 /* Write dQH next pointer and terminate bit to 0 */ 318 dqh->next_dtd_ptr = req->head->td_dma 319 & EP_QUEUE_HEAD_NEXT_POINTER_MASK; 320 321 /* clear active and halt bit, in case set from a previous error */ 322 dqh->size_ioc_int_sts &= ~(DTD_STATUS_ACTIVE | DTD_STATUS_HALTED); 323 324 /* Ensure that updates to the QH will occur before priming. */ 325 wmb(); 326 327 /* Prime the Endpoint */ 328 writel(bit_pos, &udc->op_regs->epprime); 329 330 done: 331 return retval; 332 } 333 334 static struct mv_dtd *build_dtd(struct mv_req *req, unsigned *length, 335 dma_addr_t *dma, int *is_last) 336 { 337 struct mv_dtd *dtd; 338 struct mv_udc *udc; 339 struct mv_dqh *dqh; 340 u32 temp, mult = 0; 341 342 /* how big will this transfer be? */ 343 if (usb_endpoint_xfer_isoc(req->ep->ep.desc)) { 344 dqh = req->ep->dqh; 345 mult = (dqh->max_packet_length >> EP_QUEUE_HEAD_MULT_POS) 346 & 0x3; 347 *length = min(req->req.length - req->req.actual, 348 (unsigned)(mult * req->ep->ep.maxpacket)); 349 } else 350 *length = min(req->req.length - req->req.actual, 351 (unsigned)EP_MAX_LENGTH_TRANSFER); 352 353 udc = req->ep->udc; 354 355 /* 356 * Be careful that no _GFP_HIGHMEM is set, 357 * or we can not use dma_to_virt 358 */ 359 dtd = dma_pool_alloc(udc->dtd_pool, GFP_ATOMIC, dma); 360 if (dtd == NULL) 361 return dtd; 362 363 dtd->td_dma = *dma; 364 /* initialize buffer page pointers */ 365 temp = (u32)(req->req.dma + req->req.actual); 366 dtd->buff_ptr0 = cpu_to_le32(temp); 367 temp &= ~0xFFF; 368 dtd->buff_ptr1 = cpu_to_le32(temp + 0x1000); 369 dtd->buff_ptr2 = cpu_to_le32(temp + 0x2000); 370 dtd->buff_ptr3 = cpu_to_le32(temp + 0x3000); 371 dtd->buff_ptr4 = cpu_to_le32(temp + 0x4000); 372 373 req->req.actual += *length; 374 375 /* zlp is needed if req->req.zero is set */ 376 if (req->req.zero) { 377 if (*length == 0 || (*length % req->ep->ep.maxpacket) != 0) 378 *is_last = 1; 379 else 380 *is_last = 0; 381 } else if (req->req.length == req->req.actual) 382 *is_last = 1; 383 else 384 *is_last = 0; 385 386 /* Fill in the transfer size; set active bit */ 387 temp = ((*length << DTD_LENGTH_BIT_POS) | DTD_STATUS_ACTIVE); 388 389 /* Enable interrupt for the last dtd of a request */ 390 if (*is_last && !req->req.no_interrupt) 391 temp |= DTD_IOC; 392 393 temp |= mult << 10; 394 395 dtd->size_ioc_sts = temp; 396 397 mb(); 398 399 return dtd; 400 } 401 402 /* generate dTD linked list for a request */ 403 static int req_to_dtd(struct mv_req *req) 404 { 405 unsigned count; 406 int is_last, is_first = 1; 407 struct mv_dtd *dtd, *last_dtd = NULL; 408 dma_addr_t dma; 409 410 do { 411 dtd = build_dtd(req, &count, &dma, &is_last); 412 if (dtd == NULL) 413 return -ENOMEM; 414 415 if (is_first) { 416 is_first = 0; 417 req->head = dtd; 418 } else { 419 last_dtd->dtd_next = dma; 420 last_dtd->next_dtd_virt = dtd; 421 } 422 last_dtd = dtd; 423 req->dtd_count++; 424 } while (!is_last); 425 426 /* set terminate bit to 1 for the last dTD */ 427 dtd->dtd_next = DTD_NEXT_TERMINATE; 428 429 req->tail = dtd; 430 431 return 0; 432 } 433 434 static int mv_ep_enable(struct usb_ep *_ep, 435 const struct usb_endpoint_descriptor *desc) 436 { 437 struct mv_udc *udc; 438 struct mv_ep *ep; 439 struct mv_dqh *dqh; 440 u16 max = 0; 441 u32 bit_pos, epctrlx, direction; 442 const unsigned char zlt = 1; 443 unsigned char ios, mult; 444 unsigned long flags; 445 446 ep = container_of(_ep, struct mv_ep, ep); 447 udc = ep->udc; 448 449 if (!_ep || !desc 450 || desc->bDescriptorType != USB_DT_ENDPOINT) 451 return -EINVAL; 452 453 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) 454 return -ESHUTDOWN; 455 456 direction = ep_dir(ep); 457 max = usb_endpoint_maxp(desc); 458 459 /* 460 * disable HW zero length termination select 461 * driver handles zero length packet through req->req.zero 462 */ 463 bit_pos = 1 << ((direction == EP_DIR_OUT ? 0 : 16) + ep->ep_num); 464 465 /* Check if the Endpoint is Primed */ 466 if ((readl(&udc->op_regs->epprime) & bit_pos) 467 || (readl(&udc->op_regs->epstatus) & bit_pos)) { 468 dev_info(&udc->dev->dev, 469 "ep=%d %s: Init ERROR: ENDPTPRIME=0x%x," 470 " ENDPTSTATUS=0x%x, bit_pos=0x%x\n", 471 (unsigned)ep->ep_num, direction ? "SEND" : "RECV", 472 (unsigned)readl(&udc->op_regs->epprime), 473 (unsigned)readl(&udc->op_regs->epstatus), 474 (unsigned)bit_pos); 475 goto en_done; 476 } 477 478 /* Set the max packet length, interrupt on Setup and Mult fields */ 479 ios = 0; 480 mult = 0; 481 switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { 482 case USB_ENDPOINT_XFER_BULK: 483 case USB_ENDPOINT_XFER_INT: 484 break; 485 case USB_ENDPOINT_XFER_CONTROL: 486 ios = 1; 487 break; 488 case USB_ENDPOINT_XFER_ISOC: 489 /* Calculate transactions needed for high bandwidth iso */ 490 mult = usb_endpoint_maxp_mult(desc); 491 /* 3 transactions at most */ 492 if (mult > 3) 493 goto en_done; 494 break; 495 default: 496 goto en_done; 497 } 498 499 spin_lock_irqsave(&udc->lock, flags); 500 /* Get the endpoint queue head address */ 501 dqh = ep->dqh; 502 dqh->max_packet_length = (max << EP_QUEUE_HEAD_MAX_PKT_LEN_POS) 503 | (mult << EP_QUEUE_HEAD_MULT_POS) 504 | (zlt ? EP_QUEUE_HEAD_ZLT_SEL : 0) 505 | (ios ? EP_QUEUE_HEAD_IOS : 0); 506 dqh->next_dtd_ptr = 1; 507 dqh->size_ioc_int_sts = 0; 508 509 ep->ep.maxpacket = max; 510 ep->ep.desc = desc; 511 ep->stopped = 0; 512 513 /* Enable the endpoint for Rx or Tx and set the endpoint type */ 514 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 515 if (direction == EP_DIR_IN) { 516 epctrlx &= ~EPCTRL_TX_ALL_MASK; 517 epctrlx |= EPCTRL_TX_ENABLE | EPCTRL_TX_DATA_TOGGLE_RST 518 | ((desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) 519 << EPCTRL_TX_EP_TYPE_SHIFT); 520 } else { 521 epctrlx &= ~EPCTRL_RX_ALL_MASK; 522 epctrlx |= EPCTRL_RX_ENABLE | EPCTRL_RX_DATA_TOGGLE_RST 523 | ((desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) 524 << EPCTRL_RX_EP_TYPE_SHIFT); 525 } 526 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 527 528 /* 529 * Implement Guideline (GL# USB-7) The unused endpoint type must 530 * be programmed to bulk. 531 */ 532 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 533 if ((epctrlx & EPCTRL_RX_ENABLE) == 0) { 534 epctrlx |= (USB_ENDPOINT_XFER_BULK 535 << EPCTRL_RX_EP_TYPE_SHIFT); 536 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 537 } 538 539 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 540 if ((epctrlx & EPCTRL_TX_ENABLE) == 0) { 541 epctrlx |= (USB_ENDPOINT_XFER_BULK 542 << EPCTRL_TX_EP_TYPE_SHIFT); 543 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 544 } 545 546 spin_unlock_irqrestore(&udc->lock, flags); 547 548 return 0; 549 en_done: 550 return -EINVAL; 551 } 552 553 static int mv_ep_disable(struct usb_ep *_ep) 554 { 555 struct mv_udc *udc; 556 struct mv_ep *ep; 557 struct mv_dqh *dqh; 558 u32 epctrlx, direction; 559 unsigned long flags; 560 561 ep = container_of(_ep, struct mv_ep, ep); 562 if ((_ep == NULL) || !ep->ep.desc) 563 return -EINVAL; 564 565 udc = ep->udc; 566 567 /* Get the endpoint queue head address */ 568 dqh = ep->dqh; 569 570 spin_lock_irqsave(&udc->lock, flags); 571 572 direction = ep_dir(ep); 573 574 /* Reset the max packet length and the interrupt on Setup */ 575 dqh->max_packet_length = 0; 576 577 /* Disable the endpoint for Rx or Tx and reset the endpoint type */ 578 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 579 epctrlx &= ~((direction == EP_DIR_IN) 580 ? (EPCTRL_TX_ENABLE | EPCTRL_TX_TYPE) 581 : (EPCTRL_RX_ENABLE | EPCTRL_RX_TYPE)); 582 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 583 584 /* nuke all pending requests (does flush) */ 585 nuke(ep, -ESHUTDOWN); 586 587 ep->ep.desc = NULL; 588 ep->stopped = 1; 589 590 spin_unlock_irqrestore(&udc->lock, flags); 591 592 return 0; 593 } 594 595 static struct usb_request * 596 mv_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) 597 { 598 struct mv_req *req = NULL; 599 600 req = kzalloc(sizeof *req, gfp_flags); 601 if (!req) 602 return NULL; 603 604 req->req.dma = DMA_ADDR_INVALID; 605 INIT_LIST_HEAD(&req->queue); 606 607 return &req->req; 608 } 609 610 static void mv_free_request(struct usb_ep *_ep, struct usb_request *_req) 611 { 612 struct mv_req *req = NULL; 613 614 req = container_of(_req, struct mv_req, req); 615 616 if (_req) 617 kfree(req); 618 } 619 620 static void mv_ep_fifo_flush(struct usb_ep *_ep) 621 { 622 struct mv_udc *udc; 623 u32 bit_pos, direction; 624 struct mv_ep *ep; 625 unsigned int loops; 626 627 if (!_ep) 628 return; 629 630 ep = container_of(_ep, struct mv_ep, ep); 631 if (!ep->ep.desc) 632 return; 633 634 udc = ep->udc; 635 direction = ep_dir(ep); 636 637 if (ep->ep_num == 0) 638 bit_pos = (1 << 16) | 1; 639 else if (direction == EP_DIR_OUT) 640 bit_pos = 1 << ep->ep_num; 641 else 642 bit_pos = 1 << (16 + ep->ep_num); 643 644 loops = LOOPS(EPSTATUS_TIMEOUT); 645 do { 646 unsigned int inter_loops; 647 648 if (loops == 0) { 649 dev_err(&udc->dev->dev, 650 "TIMEOUT for ENDPTSTATUS=0x%x, bit_pos=0x%x\n", 651 (unsigned)readl(&udc->op_regs->epstatus), 652 (unsigned)bit_pos); 653 return; 654 } 655 /* Write 1 to the Flush register */ 656 writel(bit_pos, &udc->op_regs->epflush); 657 658 /* Wait until flushing completed */ 659 inter_loops = LOOPS(FLUSH_TIMEOUT); 660 while (readl(&udc->op_regs->epflush)) { 661 /* 662 * ENDPTFLUSH bit should be cleared to indicate this 663 * operation is complete 664 */ 665 if (inter_loops == 0) { 666 dev_err(&udc->dev->dev, 667 "TIMEOUT for ENDPTFLUSH=0x%x," 668 "bit_pos=0x%x\n", 669 (unsigned)readl(&udc->op_regs->epflush), 670 (unsigned)bit_pos); 671 return; 672 } 673 inter_loops--; 674 udelay(LOOPS_USEC); 675 } 676 loops--; 677 } while (readl(&udc->op_regs->epstatus) & bit_pos); 678 } 679 680 /* queues (submits) an I/O request to an endpoint */ 681 static int 682 mv_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) 683 { 684 struct mv_ep *ep = container_of(_ep, struct mv_ep, ep); 685 struct mv_req *req = container_of(_req, struct mv_req, req); 686 struct mv_udc *udc = ep->udc; 687 unsigned long flags; 688 int retval; 689 690 /* catch various bogus parameters */ 691 if (!_req || !req->req.complete || !req->req.buf 692 || !list_empty(&req->queue)) { 693 dev_err(&udc->dev->dev, "%s, bad params", __func__); 694 return -EINVAL; 695 } 696 if (unlikely(!_ep || !ep->ep.desc)) { 697 dev_err(&udc->dev->dev, "%s, bad ep", __func__); 698 return -EINVAL; 699 } 700 701 udc = ep->udc; 702 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) 703 return -ESHUTDOWN; 704 705 req->ep = ep; 706 707 /* map virtual address to hardware */ 708 retval = usb_gadget_map_request(&udc->gadget, _req, ep_dir(ep)); 709 if (retval) 710 return retval; 711 712 req->req.status = -EINPROGRESS; 713 req->req.actual = 0; 714 req->dtd_count = 0; 715 716 spin_lock_irqsave(&udc->lock, flags); 717 718 /* build dtds and push them to device queue */ 719 if (!req_to_dtd(req)) { 720 retval = queue_dtd(ep, req); 721 if (retval) { 722 spin_unlock_irqrestore(&udc->lock, flags); 723 dev_err(&udc->dev->dev, "Failed to queue dtd\n"); 724 goto err_unmap_dma; 725 } 726 } else { 727 spin_unlock_irqrestore(&udc->lock, flags); 728 dev_err(&udc->dev->dev, "Failed to dma_pool_alloc\n"); 729 retval = -ENOMEM; 730 goto err_unmap_dma; 731 } 732 733 /* Update ep0 state */ 734 if (ep->ep_num == 0) 735 udc->ep0_state = DATA_STATE_XMIT; 736 737 /* irq handler advances the queue */ 738 list_add_tail(&req->queue, &ep->queue); 739 spin_unlock_irqrestore(&udc->lock, flags); 740 741 return 0; 742 743 err_unmap_dma: 744 usb_gadget_unmap_request(&udc->gadget, _req, ep_dir(ep)); 745 746 return retval; 747 } 748 749 static void mv_prime_ep(struct mv_ep *ep, struct mv_req *req) 750 { 751 struct mv_dqh *dqh = ep->dqh; 752 u32 bit_pos; 753 754 /* Write dQH next pointer and terminate bit to 0 */ 755 dqh->next_dtd_ptr = req->head->td_dma 756 & EP_QUEUE_HEAD_NEXT_POINTER_MASK; 757 758 /* clear active and halt bit, in case set from a previous error */ 759 dqh->size_ioc_int_sts &= ~(DTD_STATUS_ACTIVE | DTD_STATUS_HALTED); 760 761 /* Ensure that updates to the QH will occure before priming. */ 762 wmb(); 763 764 bit_pos = 1 << (((ep_dir(ep) == EP_DIR_OUT) ? 0 : 16) + ep->ep_num); 765 766 /* Prime the Endpoint */ 767 writel(bit_pos, &ep->udc->op_regs->epprime); 768 } 769 770 /* dequeues (cancels, unlinks) an I/O request from an endpoint */ 771 static int mv_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) 772 { 773 struct mv_ep *ep = container_of(_ep, struct mv_ep, ep); 774 struct mv_req *req = NULL, *iter; 775 struct mv_udc *udc = ep->udc; 776 unsigned long flags; 777 int stopped, ret = 0; 778 u32 epctrlx; 779 780 if (!_ep || !_req) 781 return -EINVAL; 782 783 spin_lock_irqsave(&ep->udc->lock, flags); 784 stopped = ep->stopped; 785 786 /* Stop the ep before we deal with the queue */ 787 ep->stopped = 1; 788 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 789 if (ep_dir(ep) == EP_DIR_IN) 790 epctrlx &= ~EPCTRL_TX_ENABLE; 791 else 792 epctrlx &= ~EPCTRL_RX_ENABLE; 793 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 794 795 /* make sure it's actually queued on this endpoint */ 796 list_for_each_entry(iter, &ep->queue, queue) { 797 if (&iter->req != _req) 798 continue; 799 req = iter; 800 break; 801 } 802 if (!req) { 803 ret = -EINVAL; 804 goto out; 805 } 806 807 /* The request is in progress, or completed but not dequeued */ 808 if (ep->queue.next == &req->queue) { 809 _req->status = -ECONNRESET; 810 mv_ep_fifo_flush(_ep); /* flush current transfer */ 811 812 /* The request isn't the last request in this ep queue */ 813 if (req->queue.next != &ep->queue) { 814 struct mv_req *next_req; 815 816 next_req = list_entry(req->queue.next, 817 struct mv_req, queue); 818 819 /* Point the QH to the first TD of next request */ 820 mv_prime_ep(ep, next_req); 821 } else { 822 struct mv_dqh *qh; 823 824 qh = ep->dqh; 825 qh->next_dtd_ptr = 1; 826 qh->size_ioc_int_sts = 0; 827 } 828 829 /* The request hasn't been processed, patch up the TD chain */ 830 } else { 831 struct mv_req *prev_req; 832 833 prev_req = list_entry(req->queue.prev, struct mv_req, queue); 834 writel(readl(&req->tail->dtd_next), 835 &prev_req->tail->dtd_next); 836 837 } 838 839 done(ep, req, -ECONNRESET); 840 841 /* Enable EP */ 842 out: 843 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 844 if (ep_dir(ep) == EP_DIR_IN) 845 epctrlx |= EPCTRL_TX_ENABLE; 846 else 847 epctrlx |= EPCTRL_RX_ENABLE; 848 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 849 ep->stopped = stopped; 850 851 spin_unlock_irqrestore(&ep->udc->lock, flags); 852 return ret; 853 } 854 855 static void ep_set_stall(struct mv_udc *udc, u8 ep_num, u8 direction, int stall) 856 { 857 u32 epctrlx; 858 859 epctrlx = readl(&udc->op_regs->epctrlx[ep_num]); 860 861 if (stall) { 862 if (direction == EP_DIR_IN) 863 epctrlx |= EPCTRL_TX_EP_STALL; 864 else 865 epctrlx |= EPCTRL_RX_EP_STALL; 866 } else { 867 if (direction == EP_DIR_IN) { 868 epctrlx &= ~EPCTRL_TX_EP_STALL; 869 epctrlx |= EPCTRL_TX_DATA_TOGGLE_RST; 870 } else { 871 epctrlx &= ~EPCTRL_RX_EP_STALL; 872 epctrlx |= EPCTRL_RX_DATA_TOGGLE_RST; 873 } 874 } 875 writel(epctrlx, &udc->op_regs->epctrlx[ep_num]); 876 } 877 878 static int ep_is_stall(struct mv_udc *udc, u8 ep_num, u8 direction) 879 { 880 u32 epctrlx; 881 882 epctrlx = readl(&udc->op_regs->epctrlx[ep_num]); 883 884 if (direction == EP_DIR_OUT) 885 return (epctrlx & EPCTRL_RX_EP_STALL) ? 1 : 0; 886 else 887 return (epctrlx & EPCTRL_TX_EP_STALL) ? 1 : 0; 888 } 889 890 static int mv_ep_set_halt_wedge(struct usb_ep *_ep, int halt, int wedge) 891 { 892 struct mv_ep *ep; 893 unsigned long flags; 894 int status = 0; 895 struct mv_udc *udc; 896 897 ep = container_of(_ep, struct mv_ep, ep); 898 udc = ep->udc; 899 if (!_ep || !ep->ep.desc) { 900 status = -EINVAL; 901 goto out; 902 } 903 904 if (ep->ep.desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) { 905 status = -EOPNOTSUPP; 906 goto out; 907 } 908 909 /* 910 * Attempt to halt IN ep will fail if any transfer requests 911 * are still queue 912 */ 913 if (halt && (ep_dir(ep) == EP_DIR_IN) && !list_empty(&ep->queue)) { 914 status = -EAGAIN; 915 goto out; 916 } 917 918 spin_lock_irqsave(&ep->udc->lock, flags); 919 ep_set_stall(udc, ep->ep_num, ep_dir(ep), halt); 920 if (halt && wedge) 921 ep->wedge = 1; 922 else if (!halt) 923 ep->wedge = 0; 924 spin_unlock_irqrestore(&ep->udc->lock, flags); 925 926 if (ep->ep_num == 0) { 927 udc->ep0_state = WAIT_FOR_SETUP; 928 udc->ep0_dir = EP_DIR_OUT; 929 } 930 out: 931 return status; 932 } 933 934 static int mv_ep_set_halt(struct usb_ep *_ep, int halt) 935 { 936 return mv_ep_set_halt_wedge(_ep, halt, 0); 937 } 938 939 static int mv_ep_set_wedge(struct usb_ep *_ep) 940 { 941 return mv_ep_set_halt_wedge(_ep, 1, 1); 942 } 943 944 static const struct usb_ep_ops mv_ep_ops = { 945 .enable = mv_ep_enable, 946 .disable = mv_ep_disable, 947 948 .alloc_request = mv_alloc_request, 949 .free_request = mv_free_request, 950 951 .queue = mv_ep_queue, 952 .dequeue = mv_ep_dequeue, 953 954 .set_wedge = mv_ep_set_wedge, 955 .set_halt = mv_ep_set_halt, 956 .fifo_flush = mv_ep_fifo_flush, /* flush fifo */ 957 }; 958 959 static int udc_clock_enable(struct mv_udc *udc) 960 { 961 return clk_prepare_enable(udc->clk); 962 } 963 964 static void udc_clock_disable(struct mv_udc *udc) 965 { 966 clk_disable_unprepare(udc->clk); 967 } 968 969 static void udc_stop(struct mv_udc *udc) 970 { 971 u32 tmp; 972 973 /* Disable interrupts */ 974 tmp = readl(&udc->op_regs->usbintr); 975 tmp &= ~(USBINTR_INT_EN | USBINTR_ERR_INT_EN | 976 USBINTR_PORT_CHANGE_DETECT_EN | USBINTR_RESET_EN); 977 writel(tmp, &udc->op_regs->usbintr); 978 979 udc->stopped = 1; 980 981 /* Reset the Run the bit in the command register to stop VUSB */ 982 tmp = readl(&udc->op_regs->usbcmd); 983 tmp &= ~USBCMD_RUN_STOP; 984 writel(tmp, &udc->op_regs->usbcmd); 985 } 986 987 static void udc_start(struct mv_udc *udc) 988 { 989 u32 usbintr; 990 991 usbintr = USBINTR_INT_EN | USBINTR_ERR_INT_EN 992 | USBINTR_PORT_CHANGE_DETECT_EN 993 | USBINTR_RESET_EN | USBINTR_DEVICE_SUSPEND; 994 /* Enable interrupts */ 995 writel(usbintr, &udc->op_regs->usbintr); 996 997 udc->stopped = 0; 998 999 /* Set the Run bit in the command register */ 1000 writel(USBCMD_RUN_STOP, &udc->op_regs->usbcmd); 1001 } 1002 1003 static int udc_reset(struct mv_udc *udc) 1004 { 1005 unsigned int loops; 1006 u32 tmp, portsc; 1007 1008 /* Stop the controller */ 1009 tmp = readl(&udc->op_regs->usbcmd); 1010 tmp &= ~USBCMD_RUN_STOP; 1011 writel(tmp, &udc->op_regs->usbcmd); 1012 1013 /* Reset the controller to get default values */ 1014 writel(USBCMD_CTRL_RESET, &udc->op_regs->usbcmd); 1015 1016 /* wait for reset to complete */ 1017 loops = LOOPS(RESET_TIMEOUT); 1018 while (readl(&udc->op_regs->usbcmd) & USBCMD_CTRL_RESET) { 1019 if (loops == 0) { 1020 dev_err(&udc->dev->dev, 1021 "Wait for RESET completed TIMEOUT\n"); 1022 return -ETIMEDOUT; 1023 } 1024 loops--; 1025 udelay(LOOPS_USEC); 1026 } 1027 1028 /* set controller to device mode */ 1029 tmp = readl(&udc->op_regs->usbmode); 1030 tmp |= USBMODE_CTRL_MODE_DEVICE; 1031 1032 /* turn setup lockout off, require setup tripwire in usbcmd */ 1033 tmp |= USBMODE_SETUP_LOCK_OFF; 1034 1035 writel(tmp, &udc->op_regs->usbmode); 1036 1037 writel(0x0, &udc->op_regs->epsetupstat); 1038 1039 /* Configure the Endpoint List Address */ 1040 writel(udc->ep_dqh_dma & USB_EP_LIST_ADDRESS_MASK, 1041 &udc->op_regs->eplistaddr); 1042 1043 portsc = readl(&udc->op_regs->portsc[0]); 1044 if (readl(&udc->cap_regs->hcsparams) & HCSPARAMS_PPC) 1045 portsc &= (~PORTSCX_W1C_BITS | ~PORTSCX_PORT_POWER); 1046 1047 if (udc->force_fs) 1048 portsc |= PORTSCX_FORCE_FULL_SPEED_CONNECT; 1049 else 1050 portsc &= (~PORTSCX_FORCE_FULL_SPEED_CONNECT); 1051 1052 writel(portsc, &udc->op_regs->portsc[0]); 1053 1054 tmp = readl(&udc->op_regs->epctrlx[0]); 1055 tmp &= ~(EPCTRL_TX_EP_STALL | EPCTRL_RX_EP_STALL); 1056 writel(tmp, &udc->op_regs->epctrlx[0]); 1057 1058 return 0; 1059 } 1060 1061 static int mv_udc_enable_internal(struct mv_udc *udc) 1062 { 1063 int retval; 1064 1065 if (udc->active) 1066 return 0; 1067 1068 dev_dbg(&udc->dev->dev, "enable udc\n"); 1069 retval = udc_clock_enable(udc); 1070 if (retval) 1071 return retval; 1072 1073 if (udc->pdata->phy_init) { 1074 retval = udc->pdata->phy_init(udc->phy_regs); 1075 if (retval) { 1076 dev_err(&udc->dev->dev, 1077 "init phy error %d\n", retval); 1078 udc_clock_disable(udc); 1079 return retval; 1080 } 1081 } 1082 udc->active = 1; 1083 1084 return 0; 1085 } 1086 1087 static int mv_udc_enable(struct mv_udc *udc) 1088 { 1089 if (udc->clock_gating) 1090 return mv_udc_enable_internal(udc); 1091 1092 return 0; 1093 } 1094 1095 static void mv_udc_disable_internal(struct mv_udc *udc) 1096 { 1097 if (udc->active) { 1098 dev_dbg(&udc->dev->dev, "disable udc\n"); 1099 if (udc->pdata->phy_deinit) 1100 udc->pdata->phy_deinit(udc->phy_regs); 1101 udc_clock_disable(udc); 1102 udc->active = 0; 1103 } 1104 } 1105 1106 static void mv_udc_disable(struct mv_udc *udc) 1107 { 1108 if (udc->clock_gating) 1109 mv_udc_disable_internal(udc); 1110 } 1111 1112 static int mv_udc_get_frame(struct usb_gadget *gadget) 1113 { 1114 struct mv_udc *udc; 1115 u16 retval; 1116 1117 if (!gadget) 1118 return -ENODEV; 1119 1120 udc = container_of(gadget, struct mv_udc, gadget); 1121 1122 retval = readl(&udc->op_regs->frindex) & USB_FRINDEX_MASKS; 1123 1124 return retval; 1125 } 1126 1127 /* Tries to wake up the host connected to this gadget */ 1128 static int mv_udc_wakeup(struct usb_gadget *gadget) 1129 { 1130 struct mv_udc *udc = container_of(gadget, struct mv_udc, gadget); 1131 u32 portsc; 1132 1133 /* Remote wakeup feature not enabled by host */ 1134 if (!udc->remote_wakeup) 1135 return -ENOTSUPP; 1136 1137 portsc = readl(&udc->op_regs->portsc); 1138 /* not suspended? */ 1139 if (!(portsc & PORTSCX_PORT_SUSPEND)) 1140 return 0; 1141 /* trigger force resume */ 1142 portsc |= PORTSCX_PORT_FORCE_RESUME; 1143 writel(portsc, &udc->op_regs->portsc[0]); 1144 return 0; 1145 } 1146 1147 static int mv_udc_vbus_session(struct usb_gadget *gadget, int is_active) 1148 { 1149 struct mv_udc *udc; 1150 unsigned long flags; 1151 int retval = 0; 1152 1153 udc = container_of(gadget, struct mv_udc, gadget); 1154 spin_lock_irqsave(&udc->lock, flags); 1155 1156 udc->vbus_active = (is_active != 0); 1157 1158 dev_dbg(&udc->dev->dev, "%s: softconnect %d, vbus_active %d\n", 1159 __func__, udc->softconnect, udc->vbus_active); 1160 1161 if (udc->driver && udc->softconnect && udc->vbus_active) { 1162 retval = mv_udc_enable(udc); 1163 if (retval == 0) { 1164 /* Clock is disabled, need re-init registers */ 1165 udc_reset(udc); 1166 ep0_reset(udc); 1167 udc_start(udc); 1168 } 1169 } else if (udc->driver && udc->softconnect) { 1170 if (!udc->active) 1171 goto out; 1172 1173 /* stop all the transfer in queue*/ 1174 stop_activity(udc, udc->driver); 1175 udc_stop(udc); 1176 mv_udc_disable(udc); 1177 } 1178 1179 out: 1180 spin_unlock_irqrestore(&udc->lock, flags); 1181 return retval; 1182 } 1183 1184 static int mv_udc_pullup(struct usb_gadget *gadget, int is_on) 1185 { 1186 struct mv_udc *udc; 1187 unsigned long flags; 1188 int retval = 0; 1189 1190 udc = container_of(gadget, struct mv_udc, gadget); 1191 spin_lock_irqsave(&udc->lock, flags); 1192 1193 udc->softconnect = (is_on != 0); 1194 1195 dev_dbg(&udc->dev->dev, "%s: softconnect %d, vbus_active %d\n", 1196 __func__, udc->softconnect, udc->vbus_active); 1197 1198 if (udc->driver && udc->softconnect && udc->vbus_active) { 1199 retval = mv_udc_enable(udc); 1200 if (retval == 0) { 1201 /* Clock is disabled, need re-init registers */ 1202 udc_reset(udc); 1203 ep0_reset(udc); 1204 udc_start(udc); 1205 } 1206 } else if (udc->driver && udc->vbus_active) { 1207 /* stop all the transfer in queue*/ 1208 stop_activity(udc, udc->driver); 1209 udc_stop(udc); 1210 mv_udc_disable(udc); 1211 } 1212 1213 spin_unlock_irqrestore(&udc->lock, flags); 1214 return retval; 1215 } 1216 1217 static int mv_udc_start(struct usb_gadget *, struct usb_gadget_driver *); 1218 static int mv_udc_stop(struct usb_gadget *); 1219 /* device controller usb_gadget_ops structure */ 1220 static const struct usb_gadget_ops mv_ops = { 1221 1222 /* returns the current frame number */ 1223 .get_frame = mv_udc_get_frame, 1224 1225 /* tries to wake up the host connected to this gadget */ 1226 .wakeup = mv_udc_wakeup, 1227 1228 /* notify controller that VBUS is powered or not */ 1229 .vbus_session = mv_udc_vbus_session, 1230 1231 /* D+ pullup, software-controlled connect/disconnect to USB host */ 1232 .pullup = mv_udc_pullup, 1233 .udc_start = mv_udc_start, 1234 .udc_stop = mv_udc_stop, 1235 }; 1236 1237 static int eps_init(struct mv_udc *udc) 1238 { 1239 struct mv_ep *ep; 1240 char name[14]; 1241 int i; 1242 1243 /* initialize ep0 */ 1244 ep = &udc->eps[0]; 1245 ep->udc = udc; 1246 strncpy(ep->name, "ep0", sizeof(ep->name)); 1247 ep->ep.name = ep->name; 1248 ep->ep.ops = &mv_ep_ops; 1249 ep->wedge = 0; 1250 ep->stopped = 0; 1251 usb_ep_set_maxpacket_limit(&ep->ep, EP0_MAX_PKT_SIZE); 1252 ep->ep.caps.type_control = true; 1253 ep->ep.caps.dir_in = true; 1254 ep->ep.caps.dir_out = true; 1255 ep->ep_num = 0; 1256 ep->ep.desc = &mv_ep0_desc; 1257 INIT_LIST_HEAD(&ep->queue); 1258 1259 ep->ep_type = USB_ENDPOINT_XFER_CONTROL; 1260 1261 /* initialize other endpoints */ 1262 for (i = 2; i < udc->max_eps * 2; i++) { 1263 ep = &udc->eps[i]; 1264 if (i % 2) { 1265 snprintf(name, sizeof(name), "ep%din", i / 2); 1266 ep->direction = EP_DIR_IN; 1267 ep->ep.caps.dir_in = true; 1268 } else { 1269 snprintf(name, sizeof(name), "ep%dout", i / 2); 1270 ep->direction = EP_DIR_OUT; 1271 ep->ep.caps.dir_out = true; 1272 } 1273 ep->udc = udc; 1274 strncpy(ep->name, name, sizeof(ep->name)); 1275 ep->ep.name = ep->name; 1276 1277 ep->ep.caps.type_iso = true; 1278 ep->ep.caps.type_bulk = true; 1279 ep->ep.caps.type_int = true; 1280 1281 ep->ep.ops = &mv_ep_ops; 1282 ep->stopped = 0; 1283 usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0); 1284 ep->ep_num = i / 2; 1285 1286 INIT_LIST_HEAD(&ep->queue); 1287 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); 1288 1289 ep->dqh = &udc->ep_dqh[i]; 1290 } 1291 1292 return 0; 1293 } 1294 1295 /* delete all endpoint requests, called with spinlock held */ 1296 static void nuke(struct mv_ep *ep, int status) 1297 { 1298 /* called with spinlock held */ 1299 ep->stopped = 1; 1300 1301 /* endpoint fifo flush */ 1302 mv_ep_fifo_flush(&ep->ep); 1303 1304 while (!list_empty(&ep->queue)) { 1305 struct mv_req *req = NULL; 1306 req = list_entry(ep->queue.next, struct mv_req, queue); 1307 done(ep, req, status); 1308 } 1309 } 1310 1311 static void gadget_reset(struct mv_udc *udc, struct usb_gadget_driver *driver) 1312 { 1313 struct mv_ep *ep; 1314 1315 nuke(&udc->eps[0], -ESHUTDOWN); 1316 1317 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) { 1318 nuke(ep, -ESHUTDOWN); 1319 } 1320 1321 /* report reset; the driver is already quiesced */ 1322 if (driver) { 1323 spin_unlock(&udc->lock); 1324 usb_gadget_udc_reset(&udc->gadget, driver); 1325 spin_lock(&udc->lock); 1326 } 1327 } 1328 /* stop all USB activities */ 1329 static void stop_activity(struct mv_udc *udc, struct usb_gadget_driver *driver) 1330 { 1331 struct mv_ep *ep; 1332 1333 nuke(&udc->eps[0], -ESHUTDOWN); 1334 1335 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) { 1336 nuke(ep, -ESHUTDOWN); 1337 } 1338 1339 /* report disconnect; the driver is already quiesced */ 1340 if (driver) { 1341 spin_unlock(&udc->lock); 1342 driver->disconnect(&udc->gadget); 1343 spin_lock(&udc->lock); 1344 } 1345 } 1346 1347 static int mv_udc_start(struct usb_gadget *gadget, 1348 struct usb_gadget_driver *driver) 1349 { 1350 struct mv_udc *udc; 1351 int retval = 0; 1352 unsigned long flags; 1353 1354 udc = container_of(gadget, struct mv_udc, gadget); 1355 1356 if (udc->driver) 1357 return -EBUSY; 1358 1359 spin_lock_irqsave(&udc->lock, flags); 1360 1361 /* hook up the driver ... */ 1362 udc->driver = driver; 1363 1364 udc->usb_state = USB_STATE_ATTACHED; 1365 udc->ep0_state = WAIT_FOR_SETUP; 1366 udc->ep0_dir = EP_DIR_OUT; 1367 1368 spin_unlock_irqrestore(&udc->lock, flags); 1369 1370 if (udc->transceiver) { 1371 retval = otg_set_peripheral(udc->transceiver->otg, 1372 &udc->gadget); 1373 if (retval) { 1374 dev_err(&udc->dev->dev, 1375 "unable to register peripheral to otg\n"); 1376 udc->driver = NULL; 1377 return retval; 1378 } 1379 } 1380 1381 /* When boot with cable attached, there will be no vbus irq occurred */ 1382 if (udc->qwork) 1383 queue_work(udc->qwork, &udc->vbus_work); 1384 1385 return 0; 1386 } 1387 1388 static int mv_udc_stop(struct usb_gadget *gadget) 1389 { 1390 struct mv_udc *udc; 1391 unsigned long flags; 1392 1393 udc = container_of(gadget, struct mv_udc, gadget); 1394 1395 spin_lock_irqsave(&udc->lock, flags); 1396 1397 mv_udc_enable(udc); 1398 udc_stop(udc); 1399 1400 /* stop all usb activities */ 1401 udc->gadget.speed = USB_SPEED_UNKNOWN; 1402 stop_activity(udc, NULL); 1403 mv_udc_disable(udc); 1404 1405 spin_unlock_irqrestore(&udc->lock, flags); 1406 1407 /* unbind gadget driver */ 1408 udc->driver = NULL; 1409 1410 return 0; 1411 } 1412 1413 static void mv_set_ptc(struct mv_udc *udc, u32 mode) 1414 { 1415 u32 portsc; 1416 1417 portsc = readl(&udc->op_regs->portsc[0]); 1418 portsc |= mode << 16; 1419 writel(portsc, &udc->op_regs->portsc[0]); 1420 } 1421 1422 static void prime_status_complete(struct usb_ep *ep, struct usb_request *_req) 1423 { 1424 struct mv_ep *mvep = container_of(ep, struct mv_ep, ep); 1425 struct mv_req *req = container_of(_req, struct mv_req, req); 1426 struct mv_udc *udc; 1427 unsigned long flags; 1428 1429 udc = mvep->udc; 1430 1431 dev_info(&udc->dev->dev, "switch to test mode %d\n", req->test_mode); 1432 1433 spin_lock_irqsave(&udc->lock, flags); 1434 if (req->test_mode) { 1435 mv_set_ptc(udc, req->test_mode); 1436 req->test_mode = 0; 1437 } 1438 spin_unlock_irqrestore(&udc->lock, flags); 1439 } 1440 1441 static int 1442 udc_prime_status(struct mv_udc *udc, u8 direction, u16 status, bool empty) 1443 { 1444 int retval = 0; 1445 struct mv_req *req; 1446 struct mv_ep *ep; 1447 1448 ep = &udc->eps[0]; 1449 udc->ep0_dir = direction; 1450 udc->ep0_state = WAIT_FOR_OUT_STATUS; 1451 1452 req = udc->status_req; 1453 1454 /* fill in the reqest structure */ 1455 if (empty == false) { 1456 *((u16 *) req->req.buf) = cpu_to_le16(status); 1457 req->req.length = 2; 1458 } else 1459 req->req.length = 0; 1460 1461 req->ep = ep; 1462 req->req.status = -EINPROGRESS; 1463 req->req.actual = 0; 1464 if (udc->test_mode) { 1465 req->req.complete = prime_status_complete; 1466 req->test_mode = udc->test_mode; 1467 udc->test_mode = 0; 1468 } else 1469 req->req.complete = NULL; 1470 req->dtd_count = 0; 1471 1472 if (req->req.dma == DMA_ADDR_INVALID) { 1473 req->req.dma = dma_map_single(ep->udc->gadget.dev.parent, 1474 req->req.buf, req->req.length, 1475 ep_dir(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); 1476 req->mapped = 1; 1477 } 1478 1479 /* prime the data phase */ 1480 if (!req_to_dtd(req)) { 1481 retval = queue_dtd(ep, req); 1482 if (retval) { 1483 dev_err(&udc->dev->dev, 1484 "Failed to queue dtd when prime status\n"); 1485 goto out; 1486 } 1487 } else{ /* no mem */ 1488 retval = -ENOMEM; 1489 dev_err(&udc->dev->dev, 1490 "Failed to dma_pool_alloc when prime status\n"); 1491 goto out; 1492 } 1493 1494 list_add_tail(&req->queue, &ep->queue); 1495 1496 return 0; 1497 out: 1498 usb_gadget_unmap_request(&udc->gadget, &req->req, ep_dir(ep)); 1499 1500 return retval; 1501 } 1502 1503 static void mv_udc_testmode(struct mv_udc *udc, u16 index) 1504 { 1505 if (index <= USB_TEST_FORCE_ENABLE) { 1506 udc->test_mode = index; 1507 if (udc_prime_status(udc, EP_DIR_IN, 0, true)) 1508 ep0_stall(udc); 1509 } else 1510 dev_err(&udc->dev->dev, 1511 "This test mode(%d) is not supported\n", index); 1512 } 1513 1514 static void ch9setaddress(struct mv_udc *udc, struct usb_ctrlrequest *setup) 1515 { 1516 udc->dev_addr = (u8)setup->wValue; 1517 1518 /* update usb state */ 1519 udc->usb_state = USB_STATE_ADDRESS; 1520 1521 if (udc_prime_status(udc, EP_DIR_IN, 0, true)) 1522 ep0_stall(udc); 1523 } 1524 1525 static void ch9getstatus(struct mv_udc *udc, u8 ep_num, 1526 struct usb_ctrlrequest *setup) 1527 { 1528 u16 status = 0; 1529 int retval; 1530 1531 if ((setup->bRequestType & (USB_DIR_IN | USB_TYPE_MASK)) 1532 != (USB_DIR_IN | USB_TYPE_STANDARD)) 1533 return; 1534 1535 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) { 1536 status = 1 << USB_DEVICE_SELF_POWERED; 1537 status |= udc->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP; 1538 } else if ((setup->bRequestType & USB_RECIP_MASK) 1539 == USB_RECIP_INTERFACE) { 1540 /* get interface status */ 1541 status = 0; 1542 } else if ((setup->bRequestType & USB_RECIP_MASK) 1543 == USB_RECIP_ENDPOINT) { 1544 u8 ep_num, direction; 1545 1546 ep_num = setup->wIndex & USB_ENDPOINT_NUMBER_MASK; 1547 direction = (setup->wIndex & USB_ENDPOINT_DIR_MASK) 1548 ? EP_DIR_IN : EP_DIR_OUT; 1549 status = ep_is_stall(udc, ep_num, direction) 1550 << USB_ENDPOINT_HALT; 1551 } 1552 1553 retval = udc_prime_status(udc, EP_DIR_IN, status, false); 1554 if (retval) 1555 ep0_stall(udc); 1556 else 1557 udc->ep0_state = DATA_STATE_XMIT; 1558 } 1559 1560 static void ch9clearfeature(struct mv_udc *udc, struct usb_ctrlrequest *setup) 1561 { 1562 u8 ep_num; 1563 u8 direction; 1564 struct mv_ep *ep; 1565 1566 if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK)) 1567 == ((USB_TYPE_STANDARD | USB_RECIP_DEVICE))) { 1568 switch (setup->wValue) { 1569 case USB_DEVICE_REMOTE_WAKEUP: 1570 udc->remote_wakeup = 0; 1571 break; 1572 default: 1573 goto out; 1574 } 1575 } else if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK)) 1576 == ((USB_TYPE_STANDARD | USB_RECIP_ENDPOINT))) { 1577 switch (setup->wValue) { 1578 case USB_ENDPOINT_HALT: 1579 ep_num = setup->wIndex & USB_ENDPOINT_NUMBER_MASK; 1580 direction = (setup->wIndex & USB_ENDPOINT_DIR_MASK) 1581 ? EP_DIR_IN : EP_DIR_OUT; 1582 if (setup->wValue != 0 || setup->wLength != 0 1583 || ep_num > udc->max_eps) 1584 goto out; 1585 ep = &udc->eps[ep_num * 2 + direction]; 1586 if (ep->wedge == 1) 1587 break; 1588 spin_unlock(&udc->lock); 1589 ep_set_stall(udc, ep_num, direction, 0); 1590 spin_lock(&udc->lock); 1591 break; 1592 default: 1593 goto out; 1594 } 1595 } else 1596 goto out; 1597 1598 if (udc_prime_status(udc, EP_DIR_IN, 0, true)) 1599 ep0_stall(udc); 1600 out: 1601 return; 1602 } 1603 1604 static void ch9setfeature(struct mv_udc *udc, struct usb_ctrlrequest *setup) 1605 { 1606 u8 ep_num; 1607 u8 direction; 1608 1609 if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK)) 1610 == ((USB_TYPE_STANDARD | USB_RECIP_DEVICE))) { 1611 switch (setup->wValue) { 1612 case USB_DEVICE_REMOTE_WAKEUP: 1613 udc->remote_wakeup = 1; 1614 break; 1615 case USB_DEVICE_TEST_MODE: 1616 if (setup->wIndex & 0xFF 1617 || udc->gadget.speed != USB_SPEED_HIGH) 1618 ep0_stall(udc); 1619 1620 if (udc->usb_state != USB_STATE_CONFIGURED 1621 && udc->usb_state != USB_STATE_ADDRESS 1622 && udc->usb_state != USB_STATE_DEFAULT) 1623 ep0_stall(udc); 1624 1625 mv_udc_testmode(udc, (setup->wIndex >> 8)); 1626 goto out; 1627 default: 1628 goto out; 1629 } 1630 } else if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK)) 1631 == ((USB_TYPE_STANDARD | USB_RECIP_ENDPOINT))) { 1632 switch (setup->wValue) { 1633 case USB_ENDPOINT_HALT: 1634 ep_num = setup->wIndex & USB_ENDPOINT_NUMBER_MASK; 1635 direction = (setup->wIndex & USB_ENDPOINT_DIR_MASK) 1636 ? EP_DIR_IN : EP_DIR_OUT; 1637 if (setup->wValue != 0 || setup->wLength != 0 1638 || ep_num > udc->max_eps) 1639 goto out; 1640 spin_unlock(&udc->lock); 1641 ep_set_stall(udc, ep_num, direction, 1); 1642 spin_lock(&udc->lock); 1643 break; 1644 default: 1645 goto out; 1646 } 1647 } else 1648 goto out; 1649 1650 if (udc_prime_status(udc, EP_DIR_IN, 0, true)) 1651 ep0_stall(udc); 1652 out: 1653 return; 1654 } 1655 1656 static void handle_setup_packet(struct mv_udc *udc, u8 ep_num, 1657 struct usb_ctrlrequest *setup) 1658 __releases(&ep->udc->lock) 1659 __acquires(&ep->udc->lock) 1660 { 1661 bool delegate = false; 1662 1663 nuke(&udc->eps[ep_num * 2 + EP_DIR_OUT], -ESHUTDOWN); 1664 1665 dev_dbg(&udc->dev->dev, "SETUP %02x.%02x v%04x i%04x l%04x\n", 1666 setup->bRequestType, setup->bRequest, 1667 setup->wValue, setup->wIndex, setup->wLength); 1668 /* We process some standard setup requests here */ 1669 if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) { 1670 switch (setup->bRequest) { 1671 case USB_REQ_GET_STATUS: 1672 ch9getstatus(udc, ep_num, setup); 1673 break; 1674 1675 case USB_REQ_SET_ADDRESS: 1676 ch9setaddress(udc, setup); 1677 break; 1678 1679 case USB_REQ_CLEAR_FEATURE: 1680 ch9clearfeature(udc, setup); 1681 break; 1682 1683 case USB_REQ_SET_FEATURE: 1684 ch9setfeature(udc, setup); 1685 break; 1686 1687 default: 1688 delegate = true; 1689 } 1690 } else 1691 delegate = true; 1692 1693 /* delegate USB standard requests to the gadget driver */ 1694 if (delegate == true) { 1695 /* USB requests handled by gadget */ 1696 if (setup->wLength) { 1697 /* DATA phase from gadget, STATUS phase from udc */ 1698 udc->ep0_dir = (setup->bRequestType & USB_DIR_IN) 1699 ? EP_DIR_IN : EP_DIR_OUT; 1700 spin_unlock(&udc->lock); 1701 if (udc->driver->setup(&udc->gadget, 1702 &udc->local_setup_buff) < 0) 1703 ep0_stall(udc); 1704 spin_lock(&udc->lock); 1705 udc->ep0_state = (setup->bRequestType & USB_DIR_IN) 1706 ? DATA_STATE_XMIT : DATA_STATE_RECV; 1707 } else { 1708 /* no DATA phase, IN STATUS phase from gadget */ 1709 udc->ep0_dir = EP_DIR_IN; 1710 spin_unlock(&udc->lock); 1711 if (udc->driver->setup(&udc->gadget, 1712 &udc->local_setup_buff) < 0) 1713 ep0_stall(udc); 1714 spin_lock(&udc->lock); 1715 udc->ep0_state = WAIT_FOR_OUT_STATUS; 1716 } 1717 } 1718 } 1719 1720 /* complete DATA or STATUS phase of ep0 prime status phase if needed */ 1721 static void ep0_req_complete(struct mv_udc *udc, 1722 struct mv_ep *ep0, struct mv_req *req) 1723 { 1724 u32 new_addr; 1725 1726 if (udc->usb_state == USB_STATE_ADDRESS) { 1727 /* set the new address */ 1728 new_addr = (u32)udc->dev_addr; 1729 writel(new_addr << USB_DEVICE_ADDRESS_BIT_SHIFT, 1730 &udc->op_regs->deviceaddr); 1731 } 1732 1733 done(ep0, req, 0); 1734 1735 switch (udc->ep0_state) { 1736 case DATA_STATE_XMIT: 1737 /* receive status phase */ 1738 if (udc_prime_status(udc, EP_DIR_OUT, 0, true)) 1739 ep0_stall(udc); 1740 break; 1741 case DATA_STATE_RECV: 1742 /* send status phase */ 1743 if (udc_prime_status(udc, EP_DIR_IN, 0 , true)) 1744 ep0_stall(udc); 1745 break; 1746 case WAIT_FOR_OUT_STATUS: 1747 udc->ep0_state = WAIT_FOR_SETUP; 1748 break; 1749 case WAIT_FOR_SETUP: 1750 dev_err(&udc->dev->dev, "unexpect ep0 packets\n"); 1751 break; 1752 default: 1753 ep0_stall(udc); 1754 break; 1755 } 1756 } 1757 1758 static void get_setup_data(struct mv_udc *udc, u8 ep_num, u8 *buffer_ptr) 1759 { 1760 u32 temp; 1761 struct mv_dqh *dqh; 1762 1763 dqh = &udc->ep_dqh[ep_num * 2 + EP_DIR_OUT]; 1764 1765 /* Clear bit in ENDPTSETUPSTAT */ 1766 writel((1 << ep_num), &udc->op_regs->epsetupstat); 1767 1768 /* while a hazard exists when setup package arrives */ 1769 do { 1770 /* Set Setup Tripwire */ 1771 temp = readl(&udc->op_regs->usbcmd); 1772 writel(temp | USBCMD_SETUP_TRIPWIRE_SET, &udc->op_regs->usbcmd); 1773 1774 /* Copy the setup packet to local buffer */ 1775 memcpy(buffer_ptr, (u8 *) dqh->setup_buffer, 8); 1776 } while (!(readl(&udc->op_regs->usbcmd) & USBCMD_SETUP_TRIPWIRE_SET)); 1777 1778 /* Clear Setup Tripwire */ 1779 temp = readl(&udc->op_regs->usbcmd); 1780 writel(temp & ~USBCMD_SETUP_TRIPWIRE_SET, &udc->op_regs->usbcmd); 1781 } 1782 1783 static void irq_process_tr_complete(struct mv_udc *udc) 1784 { 1785 u32 tmp, bit_pos; 1786 int i, ep_num = 0, direction = 0; 1787 struct mv_ep *curr_ep; 1788 struct mv_req *curr_req, *temp_req; 1789 int status; 1790 1791 /* 1792 * We use separate loops for ENDPTSETUPSTAT and ENDPTCOMPLETE 1793 * because the setup packets are to be read ASAP 1794 */ 1795 1796 /* Process all Setup packet received interrupts */ 1797 tmp = readl(&udc->op_regs->epsetupstat); 1798 1799 if (tmp) { 1800 for (i = 0; i < udc->max_eps; i++) { 1801 if (tmp & (1 << i)) { 1802 get_setup_data(udc, i, 1803 (u8 *)(&udc->local_setup_buff)); 1804 handle_setup_packet(udc, i, 1805 &udc->local_setup_buff); 1806 } 1807 } 1808 } 1809 1810 /* Don't clear the endpoint setup status register here. 1811 * It is cleared as a setup packet is read out of the buffer 1812 */ 1813 1814 /* Process non-setup transaction complete interrupts */ 1815 tmp = readl(&udc->op_regs->epcomplete); 1816 1817 if (!tmp) 1818 return; 1819 1820 writel(tmp, &udc->op_regs->epcomplete); 1821 1822 for (i = 0; i < udc->max_eps * 2; i++) { 1823 ep_num = i >> 1; 1824 direction = i % 2; 1825 1826 bit_pos = 1 << (ep_num + 16 * direction); 1827 1828 if (!(bit_pos & tmp)) 1829 continue; 1830 1831 if (i == 1) 1832 curr_ep = &udc->eps[0]; 1833 else 1834 curr_ep = &udc->eps[i]; 1835 /* process the req queue until an uncomplete request */ 1836 list_for_each_entry_safe(curr_req, temp_req, 1837 &curr_ep->queue, queue) { 1838 status = process_ep_req(udc, i, curr_req); 1839 if (status) 1840 break; 1841 1842 /* write back status to req */ 1843 curr_req->req.status = status; 1844 1845 /* ep0 request completion */ 1846 if (ep_num == 0) { 1847 ep0_req_complete(udc, curr_ep, curr_req); 1848 break; 1849 } else { 1850 done(curr_ep, curr_req, status); 1851 } 1852 } 1853 } 1854 } 1855 1856 static void irq_process_reset(struct mv_udc *udc) 1857 { 1858 u32 tmp; 1859 unsigned int loops; 1860 1861 udc->ep0_dir = EP_DIR_OUT; 1862 udc->ep0_state = WAIT_FOR_SETUP; 1863 udc->remote_wakeup = 0; /* default to 0 on reset */ 1864 1865 /* The address bits are past bit 25-31. Set the address */ 1866 tmp = readl(&udc->op_regs->deviceaddr); 1867 tmp &= ~(USB_DEVICE_ADDRESS_MASK); 1868 writel(tmp, &udc->op_regs->deviceaddr); 1869 1870 /* Clear all the setup token semaphores */ 1871 tmp = readl(&udc->op_regs->epsetupstat); 1872 writel(tmp, &udc->op_regs->epsetupstat); 1873 1874 /* Clear all the endpoint complete status bits */ 1875 tmp = readl(&udc->op_regs->epcomplete); 1876 writel(tmp, &udc->op_regs->epcomplete); 1877 1878 /* wait until all endptprime bits cleared */ 1879 loops = LOOPS(PRIME_TIMEOUT); 1880 while (readl(&udc->op_regs->epprime) & 0xFFFFFFFF) { 1881 if (loops == 0) { 1882 dev_err(&udc->dev->dev, 1883 "Timeout for ENDPTPRIME = 0x%x\n", 1884 readl(&udc->op_regs->epprime)); 1885 break; 1886 } 1887 loops--; 1888 udelay(LOOPS_USEC); 1889 } 1890 1891 /* Write 1s to the Flush register */ 1892 writel((u32)~0, &udc->op_regs->epflush); 1893 1894 if (readl(&udc->op_regs->portsc[0]) & PORTSCX_PORT_RESET) { 1895 dev_info(&udc->dev->dev, "usb bus reset\n"); 1896 udc->usb_state = USB_STATE_DEFAULT; 1897 /* reset all the queues, stop all USB activities */ 1898 gadget_reset(udc, udc->driver); 1899 } else { 1900 dev_info(&udc->dev->dev, "USB reset portsc 0x%x\n", 1901 readl(&udc->op_regs->portsc)); 1902 1903 /* 1904 * re-initialize 1905 * controller reset 1906 */ 1907 udc_reset(udc); 1908 1909 /* reset all the queues, stop all USB activities */ 1910 stop_activity(udc, udc->driver); 1911 1912 /* reset ep0 dQH and endptctrl */ 1913 ep0_reset(udc); 1914 1915 /* enable interrupt and set controller to run state */ 1916 udc_start(udc); 1917 1918 udc->usb_state = USB_STATE_ATTACHED; 1919 } 1920 } 1921 1922 static void handle_bus_resume(struct mv_udc *udc) 1923 { 1924 udc->usb_state = udc->resume_state; 1925 udc->resume_state = 0; 1926 1927 /* report resume to the driver */ 1928 if (udc->driver) { 1929 if (udc->driver->resume) { 1930 spin_unlock(&udc->lock); 1931 udc->driver->resume(&udc->gadget); 1932 spin_lock(&udc->lock); 1933 } 1934 } 1935 } 1936 1937 static void irq_process_suspend(struct mv_udc *udc) 1938 { 1939 udc->resume_state = udc->usb_state; 1940 udc->usb_state = USB_STATE_SUSPENDED; 1941 1942 if (udc->driver->suspend) { 1943 spin_unlock(&udc->lock); 1944 udc->driver->suspend(&udc->gadget); 1945 spin_lock(&udc->lock); 1946 } 1947 } 1948 1949 static void irq_process_port_change(struct mv_udc *udc) 1950 { 1951 u32 portsc; 1952 1953 portsc = readl(&udc->op_regs->portsc[0]); 1954 if (!(portsc & PORTSCX_PORT_RESET)) { 1955 /* Get the speed */ 1956 u32 speed = portsc & PORTSCX_PORT_SPEED_MASK; 1957 switch (speed) { 1958 case PORTSCX_PORT_SPEED_HIGH: 1959 udc->gadget.speed = USB_SPEED_HIGH; 1960 break; 1961 case PORTSCX_PORT_SPEED_FULL: 1962 udc->gadget.speed = USB_SPEED_FULL; 1963 break; 1964 case PORTSCX_PORT_SPEED_LOW: 1965 udc->gadget.speed = USB_SPEED_LOW; 1966 break; 1967 default: 1968 udc->gadget.speed = USB_SPEED_UNKNOWN; 1969 break; 1970 } 1971 } 1972 1973 if (portsc & PORTSCX_PORT_SUSPEND) { 1974 udc->resume_state = udc->usb_state; 1975 udc->usb_state = USB_STATE_SUSPENDED; 1976 if (udc->driver->suspend) { 1977 spin_unlock(&udc->lock); 1978 udc->driver->suspend(&udc->gadget); 1979 spin_lock(&udc->lock); 1980 } 1981 } 1982 1983 if (!(portsc & PORTSCX_PORT_SUSPEND) 1984 && udc->usb_state == USB_STATE_SUSPENDED) { 1985 handle_bus_resume(udc); 1986 } 1987 1988 if (!udc->resume_state) 1989 udc->usb_state = USB_STATE_DEFAULT; 1990 } 1991 1992 static void irq_process_error(struct mv_udc *udc) 1993 { 1994 /* Increment the error count */ 1995 udc->errors++; 1996 } 1997 1998 static irqreturn_t mv_udc_irq(int irq, void *dev) 1999 { 2000 struct mv_udc *udc = (struct mv_udc *)dev; 2001 u32 status, intr; 2002 2003 /* Disable ISR when stopped bit is set */ 2004 if (udc->stopped) 2005 return IRQ_NONE; 2006 2007 spin_lock(&udc->lock); 2008 2009 status = readl(&udc->op_regs->usbsts); 2010 intr = readl(&udc->op_regs->usbintr); 2011 status &= intr; 2012 2013 if (status == 0) { 2014 spin_unlock(&udc->lock); 2015 return IRQ_NONE; 2016 } 2017 2018 /* Clear all the interrupts occurred */ 2019 writel(status, &udc->op_regs->usbsts); 2020 2021 if (status & USBSTS_ERR) 2022 irq_process_error(udc); 2023 2024 if (status & USBSTS_RESET) 2025 irq_process_reset(udc); 2026 2027 if (status & USBSTS_PORT_CHANGE) 2028 irq_process_port_change(udc); 2029 2030 if (status & USBSTS_INT) 2031 irq_process_tr_complete(udc); 2032 2033 if (status & USBSTS_SUSPEND) 2034 irq_process_suspend(udc); 2035 2036 spin_unlock(&udc->lock); 2037 2038 return IRQ_HANDLED; 2039 } 2040 2041 static irqreturn_t mv_udc_vbus_irq(int irq, void *dev) 2042 { 2043 struct mv_udc *udc = (struct mv_udc *)dev; 2044 2045 /* polling VBUS and init phy may cause too much time*/ 2046 if (udc->qwork) 2047 queue_work(udc->qwork, &udc->vbus_work); 2048 2049 return IRQ_HANDLED; 2050 } 2051 2052 static void mv_udc_vbus_work(struct work_struct *work) 2053 { 2054 struct mv_udc *udc; 2055 unsigned int vbus; 2056 2057 udc = container_of(work, struct mv_udc, vbus_work); 2058 if (!udc->pdata->vbus) 2059 return; 2060 2061 vbus = udc->pdata->vbus->poll(); 2062 dev_info(&udc->dev->dev, "vbus is %d\n", vbus); 2063 2064 if (vbus == VBUS_HIGH) 2065 mv_udc_vbus_session(&udc->gadget, 1); 2066 else if (vbus == VBUS_LOW) 2067 mv_udc_vbus_session(&udc->gadget, 0); 2068 } 2069 2070 /* release device structure */ 2071 static void gadget_release(struct device *_dev) 2072 { 2073 struct mv_udc *udc; 2074 2075 udc = dev_get_drvdata(_dev); 2076 2077 complete(udc->done); 2078 } 2079 2080 static int mv_udc_remove(struct platform_device *pdev) 2081 { 2082 struct mv_udc *udc; 2083 2084 udc = platform_get_drvdata(pdev); 2085 2086 usb_del_gadget_udc(&udc->gadget); 2087 2088 if (udc->qwork) 2089 destroy_workqueue(udc->qwork); 2090 2091 /* free memory allocated in probe */ 2092 dma_pool_destroy(udc->dtd_pool); 2093 2094 if (udc->ep_dqh) 2095 dma_free_coherent(&pdev->dev, udc->ep_dqh_size, 2096 udc->ep_dqh, udc->ep_dqh_dma); 2097 2098 mv_udc_disable(udc); 2099 2100 /* free dev, wait for the release() finished */ 2101 wait_for_completion(udc->done); 2102 2103 return 0; 2104 } 2105 2106 static int mv_udc_probe(struct platform_device *pdev) 2107 { 2108 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); 2109 struct mv_udc *udc; 2110 int retval = 0; 2111 struct resource *r; 2112 size_t size; 2113 2114 if (pdata == NULL) { 2115 dev_err(&pdev->dev, "missing platform_data\n"); 2116 return -ENODEV; 2117 } 2118 2119 udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL); 2120 if (udc == NULL) 2121 return -ENOMEM; 2122 2123 udc->done = &release_done; 2124 udc->pdata = dev_get_platdata(&pdev->dev); 2125 spin_lock_init(&udc->lock); 2126 2127 udc->dev = pdev; 2128 2129 if (pdata->mode == MV_USB_MODE_OTG) { 2130 udc->transceiver = devm_usb_get_phy(&pdev->dev, 2131 USB_PHY_TYPE_USB2); 2132 if (IS_ERR(udc->transceiver)) { 2133 retval = PTR_ERR(udc->transceiver); 2134 2135 if (retval == -ENXIO) 2136 return retval; 2137 2138 udc->transceiver = NULL; 2139 return -EPROBE_DEFER; 2140 } 2141 } 2142 2143 /* udc only have one sysclk. */ 2144 udc->clk = devm_clk_get(&pdev->dev, NULL); 2145 if (IS_ERR(udc->clk)) 2146 return PTR_ERR(udc->clk); 2147 2148 r = platform_get_resource_byname(udc->dev, IORESOURCE_MEM, "capregs"); 2149 if (r == NULL) { 2150 dev_err(&pdev->dev, "no I/O memory resource defined\n"); 2151 return -ENODEV; 2152 } 2153 2154 udc->cap_regs = (struct mv_cap_regs __iomem *) 2155 devm_ioremap(&pdev->dev, r->start, resource_size(r)); 2156 if (udc->cap_regs == NULL) { 2157 dev_err(&pdev->dev, "failed to map I/O memory\n"); 2158 return -EBUSY; 2159 } 2160 2161 r = platform_get_resource_byname(udc->dev, IORESOURCE_MEM, "phyregs"); 2162 if (r == NULL) { 2163 dev_err(&pdev->dev, "no phy I/O memory resource defined\n"); 2164 return -ENODEV; 2165 } 2166 2167 udc->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r)); 2168 if (udc->phy_regs == NULL) { 2169 dev_err(&pdev->dev, "failed to map phy I/O memory\n"); 2170 return -EBUSY; 2171 } 2172 2173 /* we will acces controller register, so enable the clk */ 2174 retval = mv_udc_enable_internal(udc); 2175 if (retval) 2176 return retval; 2177 2178 udc->op_regs = 2179 (struct mv_op_regs __iomem *)((unsigned long)udc->cap_regs 2180 + (readl(&udc->cap_regs->caplength_hciversion) 2181 & CAPLENGTH_MASK)); 2182 udc->max_eps = readl(&udc->cap_regs->dccparams) & DCCPARAMS_DEN_MASK; 2183 2184 /* 2185 * some platform will use usb to download image, it may not disconnect 2186 * usb gadget before loading kernel. So first stop udc here. 2187 */ 2188 udc_stop(udc); 2189 writel(0xFFFFFFFF, &udc->op_regs->usbsts); 2190 2191 size = udc->max_eps * sizeof(struct mv_dqh) *2; 2192 size = (size + DQH_ALIGNMENT - 1) & ~(DQH_ALIGNMENT - 1); 2193 udc->ep_dqh = dma_alloc_coherent(&pdev->dev, size, 2194 &udc->ep_dqh_dma, GFP_KERNEL); 2195 2196 if (udc->ep_dqh == NULL) { 2197 dev_err(&pdev->dev, "allocate dQH memory failed\n"); 2198 retval = -ENOMEM; 2199 goto err_disable_clock; 2200 } 2201 udc->ep_dqh_size = size; 2202 2203 /* create dTD dma_pool resource */ 2204 udc->dtd_pool = dma_pool_create("mv_dtd", 2205 &pdev->dev, 2206 sizeof(struct mv_dtd), 2207 DTD_ALIGNMENT, 2208 DMA_BOUNDARY); 2209 2210 if (!udc->dtd_pool) { 2211 retval = -ENOMEM; 2212 goto err_free_dma; 2213 } 2214 2215 size = udc->max_eps * sizeof(struct mv_ep) *2; 2216 udc->eps = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); 2217 if (udc->eps == NULL) { 2218 retval = -ENOMEM; 2219 goto err_destroy_dma; 2220 } 2221 2222 /* initialize ep0 status request structure */ 2223 udc->status_req = devm_kzalloc(&pdev->dev, sizeof(struct mv_req), 2224 GFP_KERNEL); 2225 if (!udc->status_req) { 2226 retval = -ENOMEM; 2227 goto err_destroy_dma; 2228 } 2229 INIT_LIST_HEAD(&udc->status_req->queue); 2230 2231 /* allocate a small amount of memory to get valid address */ 2232 udc->status_req->req.buf = kzalloc(8, GFP_KERNEL); 2233 udc->status_req->req.dma = DMA_ADDR_INVALID; 2234 2235 udc->resume_state = USB_STATE_NOTATTACHED; 2236 udc->usb_state = USB_STATE_POWERED; 2237 udc->ep0_dir = EP_DIR_OUT; 2238 udc->remote_wakeup = 0; 2239 2240 r = platform_get_resource(udc->dev, IORESOURCE_IRQ, 0); 2241 if (r == NULL) { 2242 dev_err(&pdev->dev, "no IRQ resource defined\n"); 2243 retval = -ENODEV; 2244 goto err_destroy_dma; 2245 } 2246 udc->irq = r->start; 2247 if (devm_request_irq(&pdev->dev, udc->irq, mv_udc_irq, 2248 IRQF_SHARED, driver_name, udc)) { 2249 dev_err(&pdev->dev, "Request irq %d for UDC failed\n", 2250 udc->irq); 2251 retval = -ENODEV; 2252 goto err_destroy_dma; 2253 } 2254 2255 /* initialize gadget structure */ 2256 udc->gadget.ops = &mv_ops; /* usb_gadget_ops */ 2257 udc->gadget.ep0 = &udc->eps[0].ep; /* gadget ep0 */ 2258 INIT_LIST_HEAD(&udc->gadget.ep_list); /* ep_list */ 2259 udc->gadget.speed = USB_SPEED_UNKNOWN; /* speed */ 2260 udc->gadget.max_speed = USB_SPEED_HIGH; /* support dual speed */ 2261 2262 /* the "gadget" abstracts/virtualizes the controller */ 2263 udc->gadget.name = driver_name; /* gadget name */ 2264 2265 eps_init(udc); 2266 2267 /* VBUS detect: we can disable/enable clock on demand.*/ 2268 if (udc->transceiver) 2269 udc->clock_gating = 1; 2270 else if (pdata->vbus) { 2271 udc->clock_gating = 1; 2272 retval = devm_request_threaded_irq(&pdev->dev, 2273 pdata->vbus->irq, NULL, 2274 mv_udc_vbus_irq, IRQF_ONESHOT, "vbus", udc); 2275 if (retval) { 2276 dev_info(&pdev->dev, 2277 "Can not request irq for VBUS, " 2278 "disable clock gating\n"); 2279 udc->clock_gating = 0; 2280 } 2281 2282 udc->qwork = create_singlethread_workqueue("mv_udc_queue"); 2283 if (!udc->qwork) { 2284 dev_err(&pdev->dev, "cannot create workqueue\n"); 2285 retval = -ENOMEM; 2286 goto err_destroy_dma; 2287 } 2288 2289 INIT_WORK(&udc->vbus_work, mv_udc_vbus_work); 2290 } 2291 2292 /* 2293 * When clock gating is supported, we can disable clk and phy. 2294 * If not, it means that VBUS detection is not supported, we 2295 * have to enable vbus active all the time to let controller work. 2296 */ 2297 if (udc->clock_gating) 2298 mv_udc_disable_internal(udc); 2299 else 2300 udc->vbus_active = 1; 2301 2302 retval = usb_add_gadget_udc_release(&pdev->dev, &udc->gadget, 2303 gadget_release); 2304 if (retval) 2305 goto err_create_workqueue; 2306 2307 platform_set_drvdata(pdev, udc); 2308 dev_info(&pdev->dev, "successful probe UDC device %s clock gating.\n", 2309 udc->clock_gating ? "with" : "without"); 2310 2311 return 0; 2312 2313 err_create_workqueue: 2314 if (udc->qwork) 2315 destroy_workqueue(udc->qwork); 2316 err_destroy_dma: 2317 dma_pool_destroy(udc->dtd_pool); 2318 err_free_dma: 2319 dma_free_coherent(&pdev->dev, udc->ep_dqh_size, 2320 udc->ep_dqh, udc->ep_dqh_dma); 2321 err_disable_clock: 2322 mv_udc_disable_internal(udc); 2323 2324 return retval; 2325 } 2326 2327 #ifdef CONFIG_PM 2328 static int mv_udc_suspend(struct device *dev) 2329 { 2330 struct mv_udc *udc; 2331 2332 udc = dev_get_drvdata(dev); 2333 2334 /* if OTG is enabled, the following will be done in OTG driver*/ 2335 if (udc->transceiver) 2336 return 0; 2337 2338 if (udc->pdata->vbus && udc->pdata->vbus->poll) 2339 if (udc->pdata->vbus->poll() == VBUS_HIGH) { 2340 dev_info(&udc->dev->dev, "USB cable is connected!\n"); 2341 return -EAGAIN; 2342 } 2343 2344 /* 2345 * only cable is unplugged, udc can suspend. 2346 * So do not care about clock_gating == 1. 2347 */ 2348 if (!udc->clock_gating) { 2349 udc_stop(udc); 2350 2351 spin_lock_irq(&udc->lock); 2352 /* stop all usb activities */ 2353 stop_activity(udc, udc->driver); 2354 spin_unlock_irq(&udc->lock); 2355 2356 mv_udc_disable_internal(udc); 2357 } 2358 2359 return 0; 2360 } 2361 2362 static int mv_udc_resume(struct device *dev) 2363 { 2364 struct mv_udc *udc; 2365 int retval; 2366 2367 udc = dev_get_drvdata(dev); 2368 2369 /* if OTG is enabled, the following will be done in OTG driver*/ 2370 if (udc->transceiver) 2371 return 0; 2372 2373 if (!udc->clock_gating) { 2374 retval = mv_udc_enable_internal(udc); 2375 if (retval) 2376 return retval; 2377 2378 if (udc->driver && udc->softconnect) { 2379 udc_reset(udc); 2380 ep0_reset(udc); 2381 udc_start(udc); 2382 } 2383 } 2384 2385 return 0; 2386 } 2387 2388 static const struct dev_pm_ops mv_udc_pm_ops = { 2389 .suspend = mv_udc_suspend, 2390 .resume = mv_udc_resume, 2391 }; 2392 #endif 2393 2394 static void mv_udc_shutdown(struct platform_device *pdev) 2395 { 2396 struct mv_udc *udc; 2397 u32 mode; 2398 2399 udc = platform_get_drvdata(pdev); 2400 /* reset controller mode to IDLE */ 2401 mv_udc_enable(udc); 2402 mode = readl(&udc->op_regs->usbmode); 2403 mode &= ~3; 2404 writel(mode, &udc->op_regs->usbmode); 2405 mv_udc_disable(udc); 2406 } 2407 2408 static struct platform_driver udc_driver = { 2409 .probe = mv_udc_probe, 2410 .remove = mv_udc_remove, 2411 .shutdown = mv_udc_shutdown, 2412 .driver = { 2413 .name = "mv-udc", 2414 #ifdef CONFIG_PM 2415 .pm = &mv_udc_pm_ops, 2416 #endif 2417 }, 2418 }; 2419 2420 module_platform_driver(udc_driver); 2421 MODULE_ALIAS("platform:mv-udc"); 2422 MODULE_DESCRIPTION(DRIVER_DESC); 2423 MODULE_AUTHOR("Chao Xie <chao.xie@marvell.com>"); 2424 MODULE_LICENSE("GPL"); 2425