1 /* 2 * Copyright (C) 2011 Marvell International Ltd. All rights reserved. 3 * Author: Chao Xie <chao.xie@marvell.com> 4 * Neil Zhang <zhangwm@marvell.com> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/pci.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/dmapool.h> 16 #include <linux/kernel.h> 17 #include <linux/delay.h> 18 #include <linux/ioport.h> 19 #include <linux/sched.h> 20 #include <linux/slab.h> 21 #include <linux/errno.h> 22 #include <linux/err.h> 23 #include <linux/timer.h> 24 #include <linux/list.h> 25 #include <linux/interrupt.h> 26 #include <linux/moduleparam.h> 27 #include <linux/device.h> 28 #include <linux/usb/ch9.h> 29 #include <linux/usb/gadget.h> 30 #include <linux/usb/otg.h> 31 #include <linux/pm.h> 32 #include <linux/io.h> 33 #include <linux/irq.h> 34 #include <linux/platform_device.h> 35 #include <linux/clk.h> 36 #include <linux/platform_data/mv_usb.h> 37 #include <asm/unaligned.h> 38 39 #include "mv_udc.h" 40 41 #define DRIVER_DESC "Marvell PXA USB Device Controller driver" 42 #define DRIVER_VERSION "8 Nov 2010" 43 44 #define ep_dir(ep) (((ep)->ep_num == 0) ? \ 45 ((ep)->udc->ep0_dir) : ((ep)->direction)) 46 47 /* timeout value -- usec */ 48 #define RESET_TIMEOUT 10000 49 #define FLUSH_TIMEOUT 10000 50 #define EPSTATUS_TIMEOUT 10000 51 #define PRIME_TIMEOUT 10000 52 #define READSAFE_TIMEOUT 1000 53 54 #define LOOPS_USEC_SHIFT 1 55 #define LOOPS_USEC (1 << LOOPS_USEC_SHIFT) 56 #define LOOPS(timeout) ((timeout) >> LOOPS_USEC_SHIFT) 57 58 static DECLARE_COMPLETION(release_done); 59 60 static const char driver_name[] = "mv_udc"; 61 static const char driver_desc[] = DRIVER_DESC; 62 63 static void nuke(struct mv_ep *ep, int status); 64 static void stop_activity(struct mv_udc *udc, struct usb_gadget_driver *driver); 65 66 /* for endpoint 0 operations */ 67 static const struct usb_endpoint_descriptor mv_ep0_desc = { 68 .bLength = USB_DT_ENDPOINT_SIZE, 69 .bDescriptorType = USB_DT_ENDPOINT, 70 .bEndpointAddress = 0, 71 .bmAttributes = USB_ENDPOINT_XFER_CONTROL, 72 .wMaxPacketSize = EP0_MAX_PKT_SIZE, 73 }; 74 75 static void ep0_reset(struct mv_udc *udc) 76 { 77 struct mv_ep *ep; 78 u32 epctrlx; 79 int i = 0; 80 81 /* ep0 in and out */ 82 for (i = 0; i < 2; i++) { 83 ep = &udc->eps[i]; 84 ep->udc = udc; 85 86 /* ep0 dQH */ 87 ep->dqh = &udc->ep_dqh[i]; 88 89 /* configure ep0 endpoint capabilities in dQH */ 90 ep->dqh->max_packet_length = 91 (EP0_MAX_PKT_SIZE << EP_QUEUE_HEAD_MAX_PKT_LEN_POS) 92 | EP_QUEUE_HEAD_IOS; 93 94 ep->dqh->next_dtd_ptr = EP_QUEUE_HEAD_NEXT_TERMINATE; 95 96 epctrlx = readl(&udc->op_regs->epctrlx[0]); 97 if (i) { /* TX */ 98 epctrlx |= EPCTRL_TX_ENABLE 99 | (USB_ENDPOINT_XFER_CONTROL 100 << EPCTRL_TX_EP_TYPE_SHIFT); 101 102 } else { /* RX */ 103 epctrlx |= EPCTRL_RX_ENABLE 104 | (USB_ENDPOINT_XFER_CONTROL 105 << EPCTRL_RX_EP_TYPE_SHIFT); 106 } 107 108 writel(epctrlx, &udc->op_regs->epctrlx[0]); 109 } 110 } 111 112 /* protocol ep0 stall, will automatically be cleared on new transaction */ 113 static void ep0_stall(struct mv_udc *udc) 114 { 115 u32 epctrlx; 116 117 /* set TX and RX to stall */ 118 epctrlx = readl(&udc->op_regs->epctrlx[0]); 119 epctrlx |= EPCTRL_RX_EP_STALL | EPCTRL_TX_EP_STALL; 120 writel(epctrlx, &udc->op_regs->epctrlx[0]); 121 122 /* update ep0 state */ 123 udc->ep0_state = WAIT_FOR_SETUP; 124 udc->ep0_dir = EP_DIR_OUT; 125 } 126 127 static int process_ep_req(struct mv_udc *udc, int index, 128 struct mv_req *curr_req) 129 { 130 struct mv_dtd *curr_dtd; 131 struct mv_dqh *curr_dqh; 132 int td_complete, actual, remaining_length; 133 int i, direction; 134 int retval = 0; 135 u32 errors; 136 u32 bit_pos; 137 138 curr_dqh = &udc->ep_dqh[index]; 139 direction = index % 2; 140 141 curr_dtd = curr_req->head; 142 td_complete = 0; 143 actual = curr_req->req.length; 144 145 for (i = 0; i < curr_req->dtd_count; i++) { 146 if (curr_dtd->size_ioc_sts & DTD_STATUS_ACTIVE) { 147 dev_dbg(&udc->dev->dev, "%s, dTD not completed\n", 148 udc->eps[index].name); 149 return 1; 150 } 151 152 errors = curr_dtd->size_ioc_sts & DTD_ERROR_MASK; 153 if (!errors) { 154 remaining_length = 155 (curr_dtd->size_ioc_sts & DTD_PACKET_SIZE) 156 >> DTD_LENGTH_BIT_POS; 157 actual -= remaining_length; 158 159 if (remaining_length) { 160 if (direction) { 161 dev_dbg(&udc->dev->dev, 162 "TX dTD remains data\n"); 163 retval = -EPROTO; 164 break; 165 } else 166 break; 167 } 168 } else { 169 dev_info(&udc->dev->dev, 170 "complete_tr error: ep=%d %s: error = 0x%x\n", 171 index >> 1, direction ? "SEND" : "RECV", 172 errors); 173 if (errors & DTD_STATUS_HALTED) { 174 /* Clear the errors and Halt condition */ 175 curr_dqh->size_ioc_int_sts &= ~errors; 176 retval = -EPIPE; 177 } else if (errors & DTD_STATUS_DATA_BUFF_ERR) { 178 retval = -EPROTO; 179 } else if (errors & DTD_STATUS_TRANSACTION_ERR) { 180 retval = -EILSEQ; 181 } 182 } 183 if (i != curr_req->dtd_count - 1) 184 curr_dtd = (struct mv_dtd *)curr_dtd->next_dtd_virt; 185 } 186 if (retval) 187 return retval; 188 189 if (direction == EP_DIR_OUT) 190 bit_pos = 1 << curr_req->ep->ep_num; 191 else 192 bit_pos = 1 << (16 + curr_req->ep->ep_num); 193 194 while ((curr_dqh->curr_dtd_ptr == curr_dtd->td_dma)) { 195 if (curr_dtd->dtd_next == EP_QUEUE_HEAD_NEXT_TERMINATE) { 196 while (readl(&udc->op_regs->epstatus) & bit_pos) 197 udelay(1); 198 break; 199 } 200 udelay(1); 201 } 202 203 curr_req->req.actual = actual; 204 205 return 0; 206 } 207 208 /* 209 * done() - retire a request; caller blocked irqs 210 * @status : request status to be set, only works when 211 * request is still in progress. 212 */ 213 static void done(struct mv_ep *ep, struct mv_req *req, int status) 214 __releases(&ep->udc->lock) 215 __acquires(&ep->udc->lock) 216 { 217 struct mv_udc *udc = NULL; 218 unsigned char stopped = ep->stopped; 219 struct mv_dtd *curr_td, *next_td; 220 int j; 221 222 udc = (struct mv_udc *)ep->udc; 223 /* Removed the req from fsl_ep->queue */ 224 list_del_init(&req->queue); 225 226 /* req.status should be set as -EINPROGRESS in ep_queue() */ 227 if (req->req.status == -EINPROGRESS) 228 req->req.status = status; 229 else 230 status = req->req.status; 231 232 /* Free dtd for the request */ 233 next_td = req->head; 234 for (j = 0; j < req->dtd_count; j++) { 235 curr_td = next_td; 236 if (j != req->dtd_count - 1) 237 next_td = curr_td->next_dtd_virt; 238 dma_pool_free(udc->dtd_pool, curr_td, curr_td->td_dma); 239 } 240 241 usb_gadget_unmap_request(&udc->gadget, &req->req, ep_dir(ep)); 242 243 if (status && (status != -ESHUTDOWN)) 244 dev_info(&udc->dev->dev, "complete %s req %p stat %d len %u/%u", 245 ep->ep.name, &req->req, status, 246 req->req.actual, req->req.length); 247 248 ep->stopped = 1; 249 250 spin_unlock(&ep->udc->lock); 251 252 usb_gadget_giveback_request(&ep->ep, &req->req); 253 254 spin_lock(&ep->udc->lock); 255 ep->stopped = stopped; 256 } 257 258 static int queue_dtd(struct mv_ep *ep, struct mv_req *req) 259 { 260 struct mv_udc *udc; 261 struct mv_dqh *dqh; 262 u32 bit_pos, direction; 263 u32 usbcmd, epstatus; 264 unsigned int loops; 265 int retval = 0; 266 267 udc = ep->udc; 268 direction = ep_dir(ep); 269 dqh = &(udc->ep_dqh[ep->ep_num * 2 + direction]); 270 bit_pos = 1 << (((direction == EP_DIR_OUT) ? 0 : 16) + ep->ep_num); 271 272 /* check if the pipe is empty */ 273 if (!(list_empty(&ep->queue))) { 274 struct mv_req *lastreq; 275 lastreq = list_entry(ep->queue.prev, struct mv_req, queue); 276 lastreq->tail->dtd_next = 277 req->head->td_dma & EP_QUEUE_HEAD_NEXT_POINTER_MASK; 278 279 wmb(); 280 281 if (readl(&udc->op_regs->epprime) & bit_pos) 282 goto done; 283 284 loops = LOOPS(READSAFE_TIMEOUT); 285 while (1) { 286 /* start with setting the semaphores */ 287 usbcmd = readl(&udc->op_regs->usbcmd); 288 usbcmd |= USBCMD_ATDTW_TRIPWIRE_SET; 289 writel(usbcmd, &udc->op_regs->usbcmd); 290 291 /* read the endpoint status */ 292 epstatus = readl(&udc->op_regs->epstatus) & bit_pos; 293 294 /* 295 * Reread the ATDTW semaphore bit to check if it is 296 * cleared. When hardware see a hazard, it will clear 297 * the bit or else we remain set to 1 and we can 298 * proceed with priming of endpoint if not already 299 * primed. 300 */ 301 if (readl(&udc->op_regs->usbcmd) 302 & USBCMD_ATDTW_TRIPWIRE_SET) 303 break; 304 305 loops--; 306 if (loops == 0) { 307 dev_err(&udc->dev->dev, 308 "Timeout for ATDTW_TRIPWIRE...\n"); 309 retval = -ETIME; 310 goto done; 311 } 312 udelay(LOOPS_USEC); 313 } 314 315 /* Clear the semaphore */ 316 usbcmd = readl(&udc->op_regs->usbcmd); 317 usbcmd &= USBCMD_ATDTW_TRIPWIRE_CLEAR; 318 writel(usbcmd, &udc->op_regs->usbcmd); 319 320 if (epstatus) 321 goto done; 322 } 323 324 /* Write dQH next pointer and terminate bit to 0 */ 325 dqh->next_dtd_ptr = req->head->td_dma 326 & EP_QUEUE_HEAD_NEXT_POINTER_MASK; 327 328 /* clear active and halt bit, in case set from a previous error */ 329 dqh->size_ioc_int_sts &= ~(DTD_STATUS_ACTIVE | DTD_STATUS_HALTED); 330 331 /* Ensure that updates to the QH will occur before priming. */ 332 wmb(); 333 334 /* Prime the Endpoint */ 335 writel(bit_pos, &udc->op_regs->epprime); 336 337 done: 338 return retval; 339 } 340 341 static struct mv_dtd *build_dtd(struct mv_req *req, unsigned *length, 342 dma_addr_t *dma, int *is_last) 343 { 344 struct mv_dtd *dtd; 345 struct mv_udc *udc; 346 struct mv_dqh *dqh; 347 u32 temp, mult = 0; 348 349 /* how big will this transfer be? */ 350 if (usb_endpoint_xfer_isoc(req->ep->ep.desc)) { 351 dqh = req->ep->dqh; 352 mult = (dqh->max_packet_length >> EP_QUEUE_HEAD_MULT_POS) 353 & 0x3; 354 *length = min(req->req.length - req->req.actual, 355 (unsigned)(mult * req->ep->ep.maxpacket)); 356 } else 357 *length = min(req->req.length - req->req.actual, 358 (unsigned)EP_MAX_LENGTH_TRANSFER); 359 360 udc = req->ep->udc; 361 362 /* 363 * Be careful that no _GFP_HIGHMEM is set, 364 * or we can not use dma_to_virt 365 */ 366 dtd = dma_pool_alloc(udc->dtd_pool, GFP_ATOMIC, dma); 367 if (dtd == NULL) 368 return dtd; 369 370 dtd->td_dma = *dma; 371 /* initialize buffer page pointers */ 372 temp = (u32)(req->req.dma + req->req.actual); 373 dtd->buff_ptr0 = cpu_to_le32(temp); 374 temp &= ~0xFFF; 375 dtd->buff_ptr1 = cpu_to_le32(temp + 0x1000); 376 dtd->buff_ptr2 = cpu_to_le32(temp + 0x2000); 377 dtd->buff_ptr3 = cpu_to_le32(temp + 0x3000); 378 dtd->buff_ptr4 = cpu_to_le32(temp + 0x4000); 379 380 req->req.actual += *length; 381 382 /* zlp is needed if req->req.zero is set */ 383 if (req->req.zero) { 384 if (*length == 0 || (*length % req->ep->ep.maxpacket) != 0) 385 *is_last = 1; 386 else 387 *is_last = 0; 388 } else if (req->req.length == req->req.actual) 389 *is_last = 1; 390 else 391 *is_last = 0; 392 393 /* Fill in the transfer size; set active bit */ 394 temp = ((*length << DTD_LENGTH_BIT_POS) | DTD_STATUS_ACTIVE); 395 396 /* Enable interrupt for the last dtd of a request */ 397 if (*is_last && !req->req.no_interrupt) 398 temp |= DTD_IOC; 399 400 temp |= mult << 10; 401 402 dtd->size_ioc_sts = temp; 403 404 mb(); 405 406 return dtd; 407 } 408 409 /* generate dTD linked list for a request */ 410 static int req_to_dtd(struct mv_req *req) 411 { 412 unsigned count; 413 int is_last, is_first = 1; 414 struct mv_dtd *dtd, *last_dtd = NULL; 415 struct mv_udc *udc; 416 dma_addr_t dma; 417 418 udc = req->ep->udc; 419 420 do { 421 dtd = build_dtd(req, &count, &dma, &is_last); 422 if (dtd == NULL) 423 return -ENOMEM; 424 425 if (is_first) { 426 is_first = 0; 427 req->head = dtd; 428 } else { 429 last_dtd->dtd_next = dma; 430 last_dtd->next_dtd_virt = dtd; 431 } 432 last_dtd = dtd; 433 req->dtd_count++; 434 } while (!is_last); 435 436 /* set terminate bit to 1 for the last dTD */ 437 dtd->dtd_next = DTD_NEXT_TERMINATE; 438 439 req->tail = dtd; 440 441 return 0; 442 } 443 444 static int mv_ep_enable(struct usb_ep *_ep, 445 const struct usb_endpoint_descriptor *desc) 446 { 447 struct mv_udc *udc; 448 struct mv_ep *ep; 449 struct mv_dqh *dqh; 450 u16 max = 0; 451 u32 bit_pos, epctrlx, direction; 452 unsigned char zlt = 0, ios = 0, mult = 0; 453 unsigned long flags; 454 455 ep = container_of(_ep, struct mv_ep, ep); 456 udc = ep->udc; 457 458 if (!_ep || !desc 459 || desc->bDescriptorType != USB_DT_ENDPOINT) 460 return -EINVAL; 461 462 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) 463 return -ESHUTDOWN; 464 465 direction = ep_dir(ep); 466 max = usb_endpoint_maxp(desc); 467 468 /* 469 * disable HW zero length termination select 470 * driver handles zero length packet through req->req.zero 471 */ 472 zlt = 1; 473 474 bit_pos = 1 << ((direction == EP_DIR_OUT ? 0 : 16) + ep->ep_num); 475 476 /* Check if the Endpoint is Primed */ 477 if ((readl(&udc->op_regs->epprime) & bit_pos) 478 || (readl(&udc->op_regs->epstatus) & bit_pos)) { 479 dev_info(&udc->dev->dev, 480 "ep=%d %s: Init ERROR: ENDPTPRIME=0x%x," 481 " ENDPTSTATUS=0x%x, bit_pos=0x%x\n", 482 (unsigned)ep->ep_num, direction ? "SEND" : "RECV", 483 (unsigned)readl(&udc->op_regs->epprime), 484 (unsigned)readl(&udc->op_regs->epstatus), 485 (unsigned)bit_pos); 486 goto en_done; 487 } 488 /* Set the max packet length, interrupt on Setup and Mult fields */ 489 switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { 490 case USB_ENDPOINT_XFER_BULK: 491 zlt = 1; 492 mult = 0; 493 break; 494 case USB_ENDPOINT_XFER_CONTROL: 495 ios = 1; 496 case USB_ENDPOINT_XFER_INT: 497 mult = 0; 498 break; 499 case USB_ENDPOINT_XFER_ISOC: 500 /* Calculate transactions needed for high bandwidth iso */ 501 mult = (unsigned char)(1 + ((max >> 11) & 0x03)); 502 max = max & 0x7ff; /* bit 0~10 */ 503 /* 3 transactions at most */ 504 if (mult > 3) 505 goto en_done; 506 break; 507 default: 508 goto en_done; 509 } 510 511 spin_lock_irqsave(&udc->lock, flags); 512 /* Get the endpoint queue head address */ 513 dqh = ep->dqh; 514 dqh->max_packet_length = (max << EP_QUEUE_HEAD_MAX_PKT_LEN_POS) 515 | (mult << EP_QUEUE_HEAD_MULT_POS) 516 | (zlt ? EP_QUEUE_HEAD_ZLT_SEL : 0) 517 | (ios ? EP_QUEUE_HEAD_IOS : 0); 518 dqh->next_dtd_ptr = 1; 519 dqh->size_ioc_int_sts = 0; 520 521 ep->ep.maxpacket = max; 522 ep->ep.desc = desc; 523 ep->stopped = 0; 524 525 /* Enable the endpoint for Rx or Tx and set the endpoint type */ 526 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 527 if (direction == EP_DIR_IN) { 528 epctrlx &= ~EPCTRL_TX_ALL_MASK; 529 epctrlx |= EPCTRL_TX_ENABLE | EPCTRL_TX_DATA_TOGGLE_RST 530 | ((desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) 531 << EPCTRL_TX_EP_TYPE_SHIFT); 532 } else { 533 epctrlx &= ~EPCTRL_RX_ALL_MASK; 534 epctrlx |= EPCTRL_RX_ENABLE | EPCTRL_RX_DATA_TOGGLE_RST 535 | ((desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) 536 << EPCTRL_RX_EP_TYPE_SHIFT); 537 } 538 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 539 540 /* 541 * Implement Guideline (GL# USB-7) The unused endpoint type must 542 * be programmed to bulk. 543 */ 544 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 545 if ((epctrlx & EPCTRL_RX_ENABLE) == 0) { 546 epctrlx |= (USB_ENDPOINT_XFER_BULK 547 << EPCTRL_RX_EP_TYPE_SHIFT); 548 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 549 } 550 551 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 552 if ((epctrlx & EPCTRL_TX_ENABLE) == 0) { 553 epctrlx |= (USB_ENDPOINT_XFER_BULK 554 << EPCTRL_TX_EP_TYPE_SHIFT); 555 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 556 } 557 558 spin_unlock_irqrestore(&udc->lock, flags); 559 560 return 0; 561 en_done: 562 return -EINVAL; 563 } 564 565 static int mv_ep_disable(struct usb_ep *_ep) 566 { 567 struct mv_udc *udc; 568 struct mv_ep *ep; 569 struct mv_dqh *dqh; 570 u32 bit_pos, epctrlx, direction; 571 unsigned long flags; 572 573 ep = container_of(_ep, struct mv_ep, ep); 574 if ((_ep == NULL) || !ep->ep.desc) 575 return -EINVAL; 576 577 udc = ep->udc; 578 579 /* Get the endpoint queue head address */ 580 dqh = ep->dqh; 581 582 spin_lock_irqsave(&udc->lock, flags); 583 584 direction = ep_dir(ep); 585 bit_pos = 1 << ((direction == EP_DIR_OUT ? 0 : 16) + ep->ep_num); 586 587 /* Reset the max packet length and the interrupt on Setup */ 588 dqh->max_packet_length = 0; 589 590 /* Disable the endpoint for Rx or Tx and reset the endpoint type */ 591 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 592 epctrlx &= ~((direction == EP_DIR_IN) 593 ? (EPCTRL_TX_ENABLE | EPCTRL_TX_TYPE) 594 : (EPCTRL_RX_ENABLE | EPCTRL_RX_TYPE)); 595 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 596 597 /* nuke all pending requests (does flush) */ 598 nuke(ep, -ESHUTDOWN); 599 600 ep->ep.desc = NULL; 601 ep->stopped = 1; 602 603 spin_unlock_irqrestore(&udc->lock, flags); 604 605 return 0; 606 } 607 608 static struct usb_request * 609 mv_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) 610 { 611 struct mv_req *req = NULL; 612 613 req = kzalloc(sizeof *req, gfp_flags); 614 if (!req) 615 return NULL; 616 617 req->req.dma = DMA_ADDR_INVALID; 618 INIT_LIST_HEAD(&req->queue); 619 620 return &req->req; 621 } 622 623 static void mv_free_request(struct usb_ep *_ep, struct usb_request *_req) 624 { 625 struct mv_req *req = NULL; 626 627 req = container_of(_req, struct mv_req, req); 628 629 if (_req) 630 kfree(req); 631 } 632 633 static void mv_ep_fifo_flush(struct usb_ep *_ep) 634 { 635 struct mv_udc *udc; 636 u32 bit_pos, direction; 637 struct mv_ep *ep; 638 unsigned int loops; 639 640 if (!_ep) 641 return; 642 643 ep = container_of(_ep, struct mv_ep, ep); 644 if (!ep->ep.desc) 645 return; 646 647 udc = ep->udc; 648 direction = ep_dir(ep); 649 650 if (ep->ep_num == 0) 651 bit_pos = (1 << 16) | 1; 652 else if (direction == EP_DIR_OUT) 653 bit_pos = 1 << ep->ep_num; 654 else 655 bit_pos = 1 << (16 + ep->ep_num); 656 657 loops = LOOPS(EPSTATUS_TIMEOUT); 658 do { 659 unsigned int inter_loops; 660 661 if (loops == 0) { 662 dev_err(&udc->dev->dev, 663 "TIMEOUT for ENDPTSTATUS=0x%x, bit_pos=0x%x\n", 664 (unsigned)readl(&udc->op_regs->epstatus), 665 (unsigned)bit_pos); 666 return; 667 } 668 /* Write 1 to the Flush register */ 669 writel(bit_pos, &udc->op_regs->epflush); 670 671 /* Wait until flushing completed */ 672 inter_loops = LOOPS(FLUSH_TIMEOUT); 673 while (readl(&udc->op_regs->epflush)) { 674 /* 675 * ENDPTFLUSH bit should be cleared to indicate this 676 * operation is complete 677 */ 678 if (inter_loops == 0) { 679 dev_err(&udc->dev->dev, 680 "TIMEOUT for ENDPTFLUSH=0x%x," 681 "bit_pos=0x%x\n", 682 (unsigned)readl(&udc->op_regs->epflush), 683 (unsigned)bit_pos); 684 return; 685 } 686 inter_loops--; 687 udelay(LOOPS_USEC); 688 } 689 loops--; 690 } while (readl(&udc->op_regs->epstatus) & bit_pos); 691 } 692 693 /* queues (submits) an I/O request to an endpoint */ 694 static int 695 mv_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) 696 { 697 struct mv_ep *ep = container_of(_ep, struct mv_ep, ep); 698 struct mv_req *req = container_of(_req, struct mv_req, req); 699 struct mv_udc *udc = ep->udc; 700 unsigned long flags; 701 int retval; 702 703 /* catch various bogus parameters */ 704 if (!_req || !req->req.complete || !req->req.buf 705 || !list_empty(&req->queue)) { 706 dev_err(&udc->dev->dev, "%s, bad params", __func__); 707 return -EINVAL; 708 } 709 if (unlikely(!_ep || !ep->ep.desc)) { 710 dev_err(&udc->dev->dev, "%s, bad ep", __func__); 711 return -EINVAL; 712 } 713 714 udc = ep->udc; 715 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) 716 return -ESHUTDOWN; 717 718 req->ep = ep; 719 720 /* map virtual address to hardware */ 721 retval = usb_gadget_map_request(&udc->gadget, _req, ep_dir(ep)); 722 if (retval) 723 return retval; 724 725 req->req.status = -EINPROGRESS; 726 req->req.actual = 0; 727 req->dtd_count = 0; 728 729 spin_lock_irqsave(&udc->lock, flags); 730 731 /* build dtds and push them to device queue */ 732 if (!req_to_dtd(req)) { 733 retval = queue_dtd(ep, req); 734 if (retval) { 735 spin_unlock_irqrestore(&udc->lock, flags); 736 dev_err(&udc->dev->dev, "Failed to queue dtd\n"); 737 goto err_unmap_dma; 738 } 739 } else { 740 spin_unlock_irqrestore(&udc->lock, flags); 741 dev_err(&udc->dev->dev, "Failed to dma_pool_alloc\n"); 742 retval = -ENOMEM; 743 goto err_unmap_dma; 744 } 745 746 /* Update ep0 state */ 747 if (ep->ep_num == 0) 748 udc->ep0_state = DATA_STATE_XMIT; 749 750 /* irq handler advances the queue */ 751 list_add_tail(&req->queue, &ep->queue); 752 spin_unlock_irqrestore(&udc->lock, flags); 753 754 return 0; 755 756 err_unmap_dma: 757 usb_gadget_unmap_request(&udc->gadget, _req, ep_dir(ep)); 758 759 return retval; 760 } 761 762 static void mv_prime_ep(struct mv_ep *ep, struct mv_req *req) 763 { 764 struct mv_dqh *dqh = ep->dqh; 765 u32 bit_pos; 766 767 /* Write dQH next pointer and terminate bit to 0 */ 768 dqh->next_dtd_ptr = req->head->td_dma 769 & EP_QUEUE_HEAD_NEXT_POINTER_MASK; 770 771 /* clear active and halt bit, in case set from a previous error */ 772 dqh->size_ioc_int_sts &= ~(DTD_STATUS_ACTIVE | DTD_STATUS_HALTED); 773 774 /* Ensure that updates to the QH will occure before priming. */ 775 wmb(); 776 777 bit_pos = 1 << (((ep_dir(ep) == EP_DIR_OUT) ? 0 : 16) + ep->ep_num); 778 779 /* Prime the Endpoint */ 780 writel(bit_pos, &ep->udc->op_regs->epprime); 781 } 782 783 /* dequeues (cancels, unlinks) an I/O request from an endpoint */ 784 static int mv_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) 785 { 786 struct mv_ep *ep = container_of(_ep, struct mv_ep, ep); 787 struct mv_req *req; 788 struct mv_udc *udc = ep->udc; 789 unsigned long flags; 790 int stopped, ret = 0; 791 u32 epctrlx; 792 793 if (!_ep || !_req) 794 return -EINVAL; 795 796 spin_lock_irqsave(&ep->udc->lock, flags); 797 stopped = ep->stopped; 798 799 /* Stop the ep before we deal with the queue */ 800 ep->stopped = 1; 801 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 802 if (ep_dir(ep) == EP_DIR_IN) 803 epctrlx &= ~EPCTRL_TX_ENABLE; 804 else 805 epctrlx &= ~EPCTRL_RX_ENABLE; 806 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 807 808 /* make sure it's actually queued on this endpoint */ 809 list_for_each_entry(req, &ep->queue, queue) { 810 if (&req->req == _req) 811 break; 812 } 813 if (&req->req != _req) { 814 ret = -EINVAL; 815 goto out; 816 } 817 818 /* The request is in progress, or completed but not dequeued */ 819 if (ep->queue.next == &req->queue) { 820 _req->status = -ECONNRESET; 821 mv_ep_fifo_flush(_ep); /* flush current transfer */ 822 823 /* The request isn't the last request in this ep queue */ 824 if (req->queue.next != &ep->queue) { 825 struct mv_req *next_req; 826 827 next_req = list_entry(req->queue.next, 828 struct mv_req, queue); 829 830 /* Point the QH to the first TD of next request */ 831 mv_prime_ep(ep, next_req); 832 } else { 833 struct mv_dqh *qh; 834 835 qh = ep->dqh; 836 qh->next_dtd_ptr = 1; 837 qh->size_ioc_int_sts = 0; 838 } 839 840 /* The request hasn't been processed, patch up the TD chain */ 841 } else { 842 struct mv_req *prev_req; 843 844 prev_req = list_entry(req->queue.prev, struct mv_req, queue); 845 writel(readl(&req->tail->dtd_next), 846 &prev_req->tail->dtd_next); 847 848 } 849 850 done(ep, req, -ECONNRESET); 851 852 /* Enable EP */ 853 out: 854 epctrlx = readl(&udc->op_regs->epctrlx[ep->ep_num]); 855 if (ep_dir(ep) == EP_DIR_IN) 856 epctrlx |= EPCTRL_TX_ENABLE; 857 else 858 epctrlx |= EPCTRL_RX_ENABLE; 859 writel(epctrlx, &udc->op_regs->epctrlx[ep->ep_num]); 860 ep->stopped = stopped; 861 862 spin_unlock_irqrestore(&ep->udc->lock, flags); 863 return ret; 864 } 865 866 static void ep_set_stall(struct mv_udc *udc, u8 ep_num, u8 direction, int stall) 867 { 868 u32 epctrlx; 869 870 epctrlx = readl(&udc->op_regs->epctrlx[ep_num]); 871 872 if (stall) { 873 if (direction == EP_DIR_IN) 874 epctrlx |= EPCTRL_TX_EP_STALL; 875 else 876 epctrlx |= EPCTRL_RX_EP_STALL; 877 } else { 878 if (direction == EP_DIR_IN) { 879 epctrlx &= ~EPCTRL_TX_EP_STALL; 880 epctrlx |= EPCTRL_TX_DATA_TOGGLE_RST; 881 } else { 882 epctrlx &= ~EPCTRL_RX_EP_STALL; 883 epctrlx |= EPCTRL_RX_DATA_TOGGLE_RST; 884 } 885 } 886 writel(epctrlx, &udc->op_regs->epctrlx[ep_num]); 887 } 888 889 static int ep_is_stall(struct mv_udc *udc, u8 ep_num, u8 direction) 890 { 891 u32 epctrlx; 892 893 epctrlx = readl(&udc->op_regs->epctrlx[ep_num]); 894 895 if (direction == EP_DIR_OUT) 896 return (epctrlx & EPCTRL_RX_EP_STALL) ? 1 : 0; 897 else 898 return (epctrlx & EPCTRL_TX_EP_STALL) ? 1 : 0; 899 } 900 901 static int mv_ep_set_halt_wedge(struct usb_ep *_ep, int halt, int wedge) 902 { 903 struct mv_ep *ep; 904 unsigned long flags = 0; 905 int status = 0; 906 struct mv_udc *udc; 907 908 ep = container_of(_ep, struct mv_ep, ep); 909 udc = ep->udc; 910 if (!_ep || !ep->ep.desc) { 911 status = -EINVAL; 912 goto out; 913 } 914 915 if (ep->ep.desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) { 916 status = -EOPNOTSUPP; 917 goto out; 918 } 919 920 /* 921 * Attempt to halt IN ep will fail if any transfer requests 922 * are still queue 923 */ 924 if (halt && (ep_dir(ep) == EP_DIR_IN) && !list_empty(&ep->queue)) { 925 status = -EAGAIN; 926 goto out; 927 } 928 929 spin_lock_irqsave(&ep->udc->lock, flags); 930 ep_set_stall(udc, ep->ep_num, ep_dir(ep), halt); 931 if (halt && wedge) 932 ep->wedge = 1; 933 else if (!halt) 934 ep->wedge = 0; 935 spin_unlock_irqrestore(&ep->udc->lock, flags); 936 937 if (ep->ep_num == 0) { 938 udc->ep0_state = WAIT_FOR_SETUP; 939 udc->ep0_dir = EP_DIR_OUT; 940 } 941 out: 942 return status; 943 } 944 945 static int mv_ep_set_halt(struct usb_ep *_ep, int halt) 946 { 947 return mv_ep_set_halt_wedge(_ep, halt, 0); 948 } 949 950 static int mv_ep_set_wedge(struct usb_ep *_ep) 951 { 952 return mv_ep_set_halt_wedge(_ep, 1, 1); 953 } 954 955 static struct usb_ep_ops mv_ep_ops = { 956 .enable = mv_ep_enable, 957 .disable = mv_ep_disable, 958 959 .alloc_request = mv_alloc_request, 960 .free_request = mv_free_request, 961 962 .queue = mv_ep_queue, 963 .dequeue = mv_ep_dequeue, 964 965 .set_wedge = mv_ep_set_wedge, 966 .set_halt = mv_ep_set_halt, 967 .fifo_flush = mv_ep_fifo_flush, /* flush fifo */ 968 }; 969 970 static void udc_clock_enable(struct mv_udc *udc) 971 { 972 clk_prepare_enable(udc->clk); 973 } 974 975 static void udc_clock_disable(struct mv_udc *udc) 976 { 977 clk_disable_unprepare(udc->clk); 978 } 979 980 static void udc_stop(struct mv_udc *udc) 981 { 982 u32 tmp; 983 984 /* Disable interrupts */ 985 tmp = readl(&udc->op_regs->usbintr); 986 tmp &= ~(USBINTR_INT_EN | USBINTR_ERR_INT_EN | 987 USBINTR_PORT_CHANGE_DETECT_EN | USBINTR_RESET_EN); 988 writel(tmp, &udc->op_regs->usbintr); 989 990 udc->stopped = 1; 991 992 /* Reset the Run the bit in the command register to stop VUSB */ 993 tmp = readl(&udc->op_regs->usbcmd); 994 tmp &= ~USBCMD_RUN_STOP; 995 writel(tmp, &udc->op_regs->usbcmd); 996 } 997 998 static void udc_start(struct mv_udc *udc) 999 { 1000 u32 usbintr; 1001 1002 usbintr = USBINTR_INT_EN | USBINTR_ERR_INT_EN 1003 | USBINTR_PORT_CHANGE_DETECT_EN 1004 | USBINTR_RESET_EN | USBINTR_DEVICE_SUSPEND; 1005 /* Enable interrupts */ 1006 writel(usbintr, &udc->op_regs->usbintr); 1007 1008 udc->stopped = 0; 1009 1010 /* Set the Run bit in the command register */ 1011 writel(USBCMD_RUN_STOP, &udc->op_regs->usbcmd); 1012 } 1013 1014 static int udc_reset(struct mv_udc *udc) 1015 { 1016 unsigned int loops; 1017 u32 tmp, portsc; 1018 1019 /* Stop the controller */ 1020 tmp = readl(&udc->op_regs->usbcmd); 1021 tmp &= ~USBCMD_RUN_STOP; 1022 writel(tmp, &udc->op_regs->usbcmd); 1023 1024 /* Reset the controller to get default values */ 1025 writel(USBCMD_CTRL_RESET, &udc->op_regs->usbcmd); 1026 1027 /* wait for reset to complete */ 1028 loops = LOOPS(RESET_TIMEOUT); 1029 while (readl(&udc->op_regs->usbcmd) & USBCMD_CTRL_RESET) { 1030 if (loops == 0) { 1031 dev_err(&udc->dev->dev, 1032 "Wait for RESET completed TIMEOUT\n"); 1033 return -ETIMEDOUT; 1034 } 1035 loops--; 1036 udelay(LOOPS_USEC); 1037 } 1038 1039 /* set controller to device mode */ 1040 tmp = readl(&udc->op_regs->usbmode); 1041 tmp |= USBMODE_CTRL_MODE_DEVICE; 1042 1043 /* turn setup lockout off, require setup tripwire in usbcmd */ 1044 tmp |= USBMODE_SETUP_LOCK_OFF; 1045 1046 writel(tmp, &udc->op_regs->usbmode); 1047 1048 writel(0x0, &udc->op_regs->epsetupstat); 1049 1050 /* Configure the Endpoint List Address */ 1051 writel(udc->ep_dqh_dma & USB_EP_LIST_ADDRESS_MASK, 1052 &udc->op_regs->eplistaddr); 1053 1054 portsc = readl(&udc->op_regs->portsc[0]); 1055 if (readl(&udc->cap_regs->hcsparams) & HCSPARAMS_PPC) 1056 portsc &= (~PORTSCX_W1C_BITS | ~PORTSCX_PORT_POWER); 1057 1058 if (udc->force_fs) 1059 portsc |= PORTSCX_FORCE_FULL_SPEED_CONNECT; 1060 else 1061 portsc &= (~PORTSCX_FORCE_FULL_SPEED_CONNECT); 1062 1063 writel(portsc, &udc->op_regs->portsc[0]); 1064 1065 tmp = readl(&udc->op_regs->epctrlx[0]); 1066 tmp &= ~(EPCTRL_TX_EP_STALL | EPCTRL_RX_EP_STALL); 1067 writel(tmp, &udc->op_regs->epctrlx[0]); 1068 1069 return 0; 1070 } 1071 1072 static int mv_udc_enable_internal(struct mv_udc *udc) 1073 { 1074 int retval; 1075 1076 if (udc->active) 1077 return 0; 1078 1079 dev_dbg(&udc->dev->dev, "enable udc\n"); 1080 udc_clock_enable(udc); 1081 if (udc->pdata->phy_init) { 1082 retval = udc->pdata->phy_init(udc->phy_regs); 1083 if (retval) { 1084 dev_err(&udc->dev->dev, 1085 "init phy error %d\n", retval); 1086 udc_clock_disable(udc); 1087 return retval; 1088 } 1089 } 1090 udc->active = 1; 1091 1092 return 0; 1093 } 1094 1095 static int mv_udc_enable(struct mv_udc *udc) 1096 { 1097 if (udc->clock_gating) 1098 return mv_udc_enable_internal(udc); 1099 1100 return 0; 1101 } 1102 1103 static void mv_udc_disable_internal(struct mv_udc *udc) 1104 { 1105 if (udc->active) { 1106 dev_dbg(&udc->dev->dev, "disable udc\n"); 1107 if (udc->pdata->phy_deinit) 1108 udc->pdata->phy_deinit(udc->phy_regs); 1109 udc_clock_disable(udc); 1110 udc->active = 0; 1111 } 1112 } 1113 1114 static void mv_udc_disable(struct mv_udc *udc) 1115 { 1116 if (udc->clock_gating) 1117 mv_udc_disable_internal(udc); 1118 } 1119 1120 static int mv_udc_get_frame(struct usb_gadget *gadget) 1121 { 1122 struct mv_udc *udc; 1123 u16 retval; 1124 1125 if (!gadget) 1126 return -ENODEV; 1127 1128 udc = container_of(gadget, struct mv_udc, gadget); 1129 1130 retval = readl(&udc->op_regs->frindex) & USB_FRINDEX_MASKS; 1131 1132 return retval; 1133 } 1134 1135 /* Tries to wake up the host connected to this gadget */ 1136 static int mv_udc_wakeup(struct usb_gadget *gadget) 1137 { 1138 struct mv_udc *udc = container_of(gadget, struct mv_udc, gadget); 1139 u32 portsc; 1140 1141 /* Remote wakeup feature not enabled by host */ 1142 if (!udc->remote_wakeup) 1143 return -ENOTSUPP; 1144 1145 portsc = readl(&udc->op_regs->portsc); 1146 /* not suspended? */ 1147 if (!(portsc & PORTSCX_PORT_SUSPEND)) 1148 return 0; 1149 /* trigger force resume */ 1150 portsc |= PORTSCX_PORT_FORCE_RESUME; 1151 writel(portsc, &udc->op_regs->portsc[0]); 1152 return 0; 1153 } 1154 1155 static int mv_udc_vbus_session(struct usb_gadget *gadget, int is_active) 1156 { 1157 struct mv_udc *udc; 1158 unsigned long flags; 1159 int retval = 0; 1160 1161 udc = container_of(gadget, struct mv_udc, gadget); 1162 spin_lock_irqsave(&udc->lock, flags); 1163 1164 udc->vbus_active = (is_active != 0); 1165 1166 dev_dbg(&udc->dev->dev, "%s: softconnect %d, vbus_active %d\n", 1167 __func__, udc->softconnect, udc->vbus_active); 1168 1169 if (udc->driver && udc->softconnect && udc->vbus_active) { 1170 retval = mv_udc_enable(udc); 1171 if (retval == 0) { 1172 /* Clock is disabled, need re-init registers */ 1173 udc_reset(udc); 1174 ep0_reset(udc); 1175 udc_start(udc); 1176 } 1177 } else if (udc->driver && udc->softconnect) { 1178 if (!udc->active) 1179 goto out; 1180 1181 /* stop all the transfer in queue*/ 1182 stop_activity(udc, udc->driver); 1183 udc_stop(udc); 1184 mv_udc_disable(udc); 1185 } 1186 1187 out: 1188 spin_unlock_irqrestore(&udc->lock, flags); 1189 return retval; 1190 } 1191 1192 static int mv_udc_pullup(struct usb_gadget *gadget, int is_on) 1193 { 1194 struct mv_udc *udc; 1195 unsigned long flags; 1196 int retval = 0; 1197 1198 udc = container_of(gadget, struct mv_udc, gadget); 1199 spin_lock_irqsave(&udc->lock, flags); 1200 1201 udc->softconnect = (is_on != 0); 1202 1203 dev_dbg(&udc->dev->dev, "%s: softconnect %d, vbus_active %d\n", 1204 __func__, udc->softconnect, udc->vbus_active); 1205 1206 if (udc->driver && udc->softconnect && udc->vbus_active) { 1207 retval = mv_udc_enable(udc); 1208 if (retval == 0) { 1209 /* Clock is disabled, need re-init registers */ 1210 udc_reset(udc); 1211 ep0_reset(udc); 1212 udc_start(udc); 1213 } 1214 } else if (udc->driver && udc->vbus_active) { 1215 /* stop all the transfer in queue*/ 1216 stop_activity(udc, udc->driver); 1217 udc_stop(udc); 1218 mv_udc_disable(udc); 1219 } 1220 1221 spin_unlock_irqrestore(&udc->lock, flags); 1222 return retval; 1223 } 1224 1225 static int mv_udc_start(struct usb_gadget *, struct usb_gadget_driver *); 1226 static int mv_udc_stop(struct usb_gadget *); 1227 /* device controller usb_gadget_ops structure */ 1228 static const struct usb_gadget_ops mv_ops = { 1229 1230 /* returns the current frame number */ 1231 .get_frame = mv_udc_get_frame, 1232 1233 /* tries to wake up the host connected to this gadget */ 1234 .wakeup = mv_udc_wakeup, 1235 1236 /* notify controller that VBUS is powered or not */ 1237 .vbus_session = mv_udc_vbus_session, 1238 1239 /* D+ pullup, software-controlled connect/disconnect to USB host */ 1240 .pullup = mv_udc_pullup, 1241 .udc_start = mv_udc_start, 1242 .udc_stop = mv_udc_stop, 1243 }; 1244 1245 static int eps_init(struct mv_udc *udc) 1246 { 1247 struct mv_ep *ep; 1248 char name[14]; 1249 int i; 1250 1251 /* initialize ep0 */ 1252 ep = &udc->eps[0]; 1253 ep->udc = udc; 1254 strncpy(ep->name, "ep0", sizeof(ep->name)); 1255 ep->ep.name = ep->name; 1256 ep->ep.ops = &mv_ep_ops; 1257 ep->wedge = 0; 1258 ep->stopped = 0; 1259 usb_ep_set_maxpacket_limit(&ep->ep, EP0_MAX_PKT_SIZE); 1260 ep->ep.caps.type_control = true; 1261 ep->ep.caps.dir_in = true; 1262 ep->ep.caps.dir_out = true; 1263 ep->ep_num = 0; 1264 ep->ep.desc = &mv_ep0_desc; 1265 INIT_LIST_HEAD(&ep->queue); 1266 1267 ep->ep_type = USB_ENDPOINT_XFER_CONTROL; 1268 1269 /* initialize other endpoints */ 1270 for (i = 2; i < udc->max_eps * 2; i++) { 1271 ep = &udc->eps[i]; 1272 if (i % 2) { 1273 snprintf(name, sizeof(name), "ep%din", i / 2); 1274 ep->direction = EP_DIR_IN; 1275 ep->ep.caps.dir_in = true; 1276 } else { 1277 snprintf(name, sizeof(name), "ep%dout", i / 2); 1278 ep->direction = EP_DIR_OUT; 1279 ep->ep.caps.dir_out = true; 1280 } 1281 ep->udc = udc; 1282 strncpy(ep->name, name, sizeof(ep->name)); 1283 ep->ep.name = ep->name; 1284 1285 ep->ep.caps.type_iso = true; 1286 ep->ep.caps.type_bulk = true; 1287 ep->ep.caps.type_int = true; 1288 1289 ep->ep.ops = &mv_ep_ops; 1290 ep->stopped = 0; 1291 usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0); 1292 ep->ep_num = i / 2; 1293 1294 INIT_LIST_HEAD(&ep->queue); 1295 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); 1296 1297 ep->dqh = &udc->ep_dqh[i]; 1298 } 1299 1300 return 0; 1301 } 1302 1303 /* delete all endpoint requests, called with spinlock held */ 1304 static void nuke(struct mv_ep *ep, int status) 1305 { 1306 /* called with spinlock held */ 1307 ep->stopped = 1; 1308 1309 /* endpoint fifo flush */ 1310 mv_ep_fifo_flush(&ep->ep); 1311 1312 while (!list_empty(&ep->queue)) { 1313 struct mv_req *req = NULL; 1314 req = list_entry(ep->queue.next, struct mv_req, queue); 1315 done(ep, req, status); 1316 } 1317 } 1318 1319 static void gadget_reset(struct mv_udc *udc, struct usb_gadget_driver *driver) 1320 { 1321 struct mv_ep *ep; 1322 1323 nuke(&udc->eps[0], -ESHUTDOWN); 1324 1325 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) { 1326 nuke(ep, -ESHUTDOWN); 1327 } 1328 1329 /* report reset; the driver is already quiesced */ 1330 if (driver) { 1331 spin_unlock(&udc->lock); 1332 usb_gadget_udc_reset(&udc->gadget, driver); 1333 spin_lock(&udc->lock); 1334 } 1335 } 1336 /* stop all USB activities */ 1337 static void stop_activity(struct mv_udc *udc, struct usb_gadget_driver *driver) 1338 { 1339 struct mv_ep *ep; 1340 1341 nuke(&udc->eps[0], -ESHUTDOWN); 1342 1343 list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) { 1344 nuke(ep, -ESHUTDOWN); 1345 } 1346 1347 /* report disconnect; the driver is already quiesced */ 1348 if (driver) { 1349 spin_unlock(&udc->lock); 1350 driver->disconnect(&udc->gadget); 1351 spin_lock(&udc->lock); 1352 } 1353 } 1354 1355 static int mv_udc_start(struct usb_gadget *gadget, 1356 struct usb_gadget_driver *driver) 1357 { 1358 struct mv_udc *udc; 1359 int retval = 0; 1360 unsigned long flags; 1361 1362 udc = container_of(gadget, struct mv_udc, gadget); 1363 1364 if (udc->driver) 1365 return -EBUSY; 1366 1367 spin_lock_irqsave(&udc->lock, flags); 1368 1369 /* hook up the driver ... */ 1370 driver->driver.bus = NULL; 1371 udc->driver = driver; 1372 1373 udc->usb_state = USB_STATE_ATTACHED; 1374 udc->ep0_state = WAIT_FOR_SETUP; 1375 udc->ep0_dir = EP_DIR_OUT; 1376 1377 spin_unlock_irqrestore(&udc->lock, flags); 1378 1379 if (udc->transceiver) { 1380 retval = otg_set_peripheral(udc->transceiver->otg, 1381 &udc->gadget); 1382 if (retval) { 1383 dev_err(&udc->dev->dev, 1384 "unable to register peripheral to otg\n"); 1385 udc->driver = NULL; 1386 return retval; 1387 } 1388 } 1389 1390 /* When boot with cable attached, there will be no vbus irq occurred */ 1391 if (udc->qwork) 1392 queue_work(udc->qwork, &udc->vbus_work); 1393 1394 return 0; 1395 } 1396 1397 static int mv_udc_stop(struct usb_gadget *gadget) 1398 { 1399 struct mv_udc *udc; 1400 unsigned long flags; 1401 1402 udc = container_of(gadget, struct mv_udc, gadget); 1403 1404 spin_lock_irqsave(&udc->lock, flags); 1405 1406 mv_udc_enable(udc); 1407 udc_stop(udc); 1408 1409 /* stop all usb activities */ 1410 udc->gadget.speed = USB_SPEED_UNKNOWN; 1411 stop_activity(udc, NULL); 1412 mv_udc_disable(udc); 1413 1414 spin_unlock_irqrestore(&udc->lock, flags); 1415 1416 /* unbind gadget driver */ 1417 udc->driver = NULL; 1418 1419 return 0; 1420 } 1421 1422 static void mv_set_ptc(struct mv_udc *udc, u32 mode) 1423 { 1424 u32 portsc; 1425 1426 portsc = readl(&udc->op_regs->portsc[0]); 1427 portsc |= mode << 16; 1428 writel(portsc, &udc->op_regs->portsc[0]); 1429 } 1430 1431 static void prime_status_complete(struct usb_ep *ep, struct usb_request *_req) 1432 { 1433 struct mv_ep *mvep = container_of(ep, struct mv_ep, ep); 1434 struct mv_req *req = container_of(_req, struct mv_req, req); 1435 struct mv_udc *udc; 1436 unsigned long flags; 1437 1438 udc = mvep->udc; 1439 1440 dev_info(&udc->dev->dev, "switch to test mode %d\n", req->test_mode); 1441 1442 spin_lock_irqsave(&udc->lock, flags); 1443 if (req->test_mode) { 1444 mv_set_ptc(udc, req->test_mode); 1445 req->test_mode = 0; 1446 } 1447 spin_unlock_irqrestore(&udc->lock, flags); 1448 } 1449 1450 static int 1451 udc_prime_status(struct mv_udc *udc, u8 direction, u16 status, bool empty) 1452 { 1453 int retval = 0; 1454 struct mv_req *req; 1455 struct mv_ep *ep; 1456 1457 ep = &udc->eps[0]; 1458 udc->ep0_dir = direction; 1459 udc->ep0_state = WAIT_FOR_OUT_STATUS; 1460 1461 req = udc->status_req; 1462 1463 /* fill in the reqest structure */ 1464 if (empty == false) { 1465 *((u16 *) req->req.buf) = cpu_to_le16(status); 1466 req->req.length = 2; 1467 } else 1468 req->req.length = 0; 1469 1470 req->ep = ep; 1471 req->req.status = -EINPROGRESS; 1472 req->req.actual = 0; 1473 if (udc->test_mode) { 1474 req->req.complete = prime_status_complete; 1475 req->test_mode = udc->test_mode; 1476 udc->test_mode = 0; 1477 } else 1478 req->req.complete = NULL; 1479 req->dtd_count = 0; 1480 1481 if (req->req.dma == DMA_ADDR_INVALID) { 1482 req->req.dma = dma_map_single(ep->udc->gadget.dev.parent, 1483 req->req.buf, req->req.length, 1484 ep_dir(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); 1485 req->mapped = 1; 1486 } 1487 1488 /* prime the data phase */ 1489 if (!req_to_dtd(req)) { 1490 retval = queue_dtd(ep, req); 1491 if (retval) { 1492 dev_err(&udc->dev->dev, 1493 "Failed to queue dtd when prime status\n"); 1494 goto out; 1495 } 1496 } else{ /* no mem */ 1497 retval = -ENOMEM; 1498 dev_err(&udc->dev->dev, 1499 "Failed to dma_pool_alloc when prime status\n"); 1500 goto out; 1501 } 1502 1503 list_add_tail(&req->queue, &ep->queue); 1504 1505 return 0; 1506 out: 1507 usb_gadget_unmap_request(&udc->gadget, &req->req, ep_dir(ep)); 1508 1509 return retval; 1510 } 1511 1512 static void mv_udc_testmode(struct mv_udc *udc, u16 index) 1513 { 1514 if (index <= TEST_FORCE_EN) { 1515 udc->test_mode = index; 1516 if (udc_prime_status(udc, EP_DIR_IN, 0, true)) 1517 ep0_stall(udc); 1518 } else 1519 dev_err(&udc->dev->dev, 1520 "This test mode(%d) is not supported\n", index); 1521 } 1522 1523 static void ch9setaddress(struct mv_udc *udc, struct usb_ctrlrequest *setup) 1524 { 1525 udc->dev_addr = (u8)setup->wValue; 1526 1527 /* update usb state */ 1528 udc->usb_state = USB_STATE_ADDRESS; 1529 1530 if (udc_prime_status(udc, EP_DIR_IN, 0, true)) 1531 ep0_stall(udc); 1532 } 1533 1534 static void ch9getstatus(struct mv_udc *udc, u8 ep_num, 1535 struct usb_ctrlrequest *setup) 1536 { 1537 u16 status = 0; 1538 int retval; 1539 1540 if ((setup->bRequestType & (USB_DIR_IN | USB_TYPE_MASK)) 1541 != (USB_DIR_IN | USB_TYPE_STANDARD)) 1542 return; 1543 1544 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) { 1545 status = 1 << USB_DEVICE_SELF_POWERED; 1546 status |= udc->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP; 1547 } else if ((setup->bRequestType & USB_RECIP_MASK) 1548 == USB_RECIP_INTERFACE) { 1549 /* get interface status */ 1550 status = 0; 1551 } else if ((setup->bRequestType & USB_RECIP_MASK) 1552 == USB_RECIP_ENDPOINT) { 1553 u8 ep_num, direction; 1554 1555 ep_num = setup->wIndex & USB_ENDPOINT_NUMBER_MASK; 1556 direction = (setup->wIndex & USB_ENDPOINT_DIR_MASK) 1557 ? EP_DIR_IN : EP_DIR_OUT; 1558 status = ep_is_stall(udc, ep_num, direction) 1559 << USB_ENDPOINT_HALT; 1560 } 1561 1562 retval = udc_prime_status(udc, EP_DIR_IN, status, false); 1563 if (retval) 1564 ep0_stall(udc); 1565 else 1566 udc->ep0_state = DATA_STATE_XMIT; 1567 } 1568 1569 static void ch9clearfeature(struct mv_udc *udc, struct usb_ctrlrequest *setup) 1570 { 1571 u8 ep_num; 1572 u8 direction; 1573 struct mv_ep *ep; 1574 1575 if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK)) 1576 == ((USB_TYPE_STANDARD | USB_RECIP_DEVICE))) { 1577 switch (setup->wValue) { 1578 case USB_DEVICE_REMOTE_WAKEUP: 1579 udc->remote_wakeup = 0; 1580 break; 1581 default: 1582 goto out; 1583 } 1584 } else if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK)) 1585 == ((USB_TYPE_STANDARD | USB_RECIP_ENDPOINT))) { 1586 switch (setup->wValue) { 1587 case USB_ENDPOINT_HALT: 1588 ep_num = setup->wIndex & USB_ENDPOINT_NUMBER_MASK; 1589 direction = (setup->wIndex & USB_ENDPOINT_DIR_MASK) 1590 ? EP_DIR_IN : EP_DIR_OUT; 1591 if (setup->wValue != 0 || setup->wLength != 0 1592 || ep_num > udc->max_eps) 1593 goto out; 1594 ep = &udc->eps[ep_num * 2 + direction]; 1595 if (ep->wedge == 1) 1596 break; 1597 spin_unlock(&udc->lock); 1598 ep_set_stall(udc, ep_num, direction, 0); 1599 spin_lock(&udc->lock); 1600 break; 1601 default: 1602 goto out; 1603 } 1604 } else 1605 goto out; 1606 1607 if (udc_prime_status(udc, EP_DIR_IN, 0, true)) 1608 ep0_stall(udc); 1609 out: 1610 return; 1611 } 1612 1613 static void ch9setfeature(struct mv_udc *udc, struct usb_ctrlrequest *setup) 1614 { 1615 u8 ep_num; 1616 u8 direction; 1617 1618 if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK)) 1619 == ((USB_TYPE_STANDARD | USB_RECIP_DEVICE))) { 1620 switch (setup->wValue) { 1621 case USB_DEVICE_REMOTE_WAKEUP: 1622 udc->remote_wakeup = 1; 1623 break; 1624 case USB_DEVICE_TEST_MODE: 1625 if (setup->wIndex & 0xFF 1626 || udc->gadget.speed != USB_SPEED_HIGH) 1627 ep0_stall(udc); 1628 1629 if (udc->usb_state != USB_STATE_CONFIGURED 1630 && udc->usb_state != USB_STATE_ADDRESS 1631 && udc->usb_state != USB_STATE_DEFAULT) 1632 ep0_stall(udc); 1633 1634 mv_udc_testmode(udc, (setup->wIndex >> 8)); 1635 goto out; 1636 default: 1637 goto out; 1638 } 1639 } else if ((setup->bRequestType & (USB_TYPE_MASK | USB_RECIP_MASK)) 1640 == ((USB_TYPE_STANDARD | USB_RECIP_ENDPOINT))) { 1641 switch (setup->wValue) { 1642 case USB_ENDPOINT_HALT: 1643 ep_num = setup->wIndex & USB_ENDPOINT_NUMBER_MASK; 1644 direction = (setup->wIndex & USB_ENDPOINT_DIR_MASK) 1645 ? EP_DIR_IN : EP_DIR_OUT; 1646 if (setup->wValue != 0 || setup->wLength != 0 1647 || ep_num > udc->max_eps) 1648 goto out; 1649 spin_unlock(&udc->lock); 1650 ep_set_stall(udc, ep_num, direction, 1); 1651 spin_lock(&udc->lock); 1652 break; 1653 default: 1654 goto out; 1655 } 1656 } else 1657 goto out; 1658 1659 if (udc_prime_status(udc, EP_DIR_IN, 0, true)) 1660 ep0_stall(udc); 1661 out: 1662 return; 1663 } 1664 1665 static void handle_setup_packet(struct mv_udc *udc, u8 ep_num, 1666 struct usb_ctrlrequest *setup) 1667 __releases(&ep->udc->lock) 1668 __acquires(&ep->udc->lock) 1669 { 1670 bool delegate = false; 1671 1672 nuke(&udc->eps[ep_num * 2 + EP_DIR_OUT], -ESHUTDOWN); 1673 1674 dev_dbg(&udc->dev->dev, "SETUP %02x.%02x v%04x i%04x l%04x\n", 1675 setup->bRequestType, setup->bRequest, 1676 setup->wValue, setup->wIndex, setup->wLength); 1677 /* We process some standard setup requests here */ 1678 if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) { 1679 switch (setup->bRequest) { 1680 case USB_REQ_GET_STATUS: 1681 ch9getstatus(udc, ep_num, setup); 1682 break; 1683 1684 case USB_REQ_SET_ADDRESS: 1685 ch9setaddress(udc, setup); 1686 break; 1687 1688 case USB_REQ_CLEAR_FEATURE: 1689 ch9clearfeature(udc, setup); 1690 break; 1691 1692 case USB_REQ_SET_FEATURE: 1693 ch9setfeature(udc, setup); 1694 break; 1695 1696 default: 1697 delegate = true; 1698 } 1699 } else 1700 delegate = true; 1701 1702 /* delegate USB standard requests to the gadget driver */ 1703 if (delegate == true) { 1704 /* USB requests handled by gadget */ 1705 if (setup->wLength) { 1706 /* DATA phase from gadget, STATUS phase from udc */ 1707 udc->ep0_dir = (setup->bRequestType & USB_DIR_IN) 1708 ? EP_DIR_IN : EP_DIR_OUT; 1709 spin_unlock(&udc->lock); 1710 if (udc->driver->setup(&udc->gadget, 1711 &udc->local_setup_buff) < 0) 1712 ep0_stall(udc); 1713 spin_lock(&udc->lock); 1714 udc->ep0_state = (setup->bRequestType & USB_DIR_IN) 1715 ? DATA_STATE_XMIT : DATA_STATE_RECV; 1716 } else { 1717 /* no DATA phase, IN STATUS phase from gadget */ 1718 udc->ep0_dir = EP_DIR_IN; 1719 spin_unlock(&udc->lock); 1720 if (udc->driver->setup(&udc->gadget, 1721 &udc->local_setup_buff) < 0) 1722 ep0_stall(udc); 1723 spin_lock(&udc->lock); 1724 udc->ep0_state = WAIT_FOR_OUT_STATUS; 1725 } 1726 } 1727 } 1728 1729 /* complete DATA or STATUS phase of ep0 prime status phase if needed */ 1730 static void ep0_req_complete(struct mv_udc *udc, 1731 struct mv_ep *ep0, struct mv_req *req) 1732 { 1733 u32 new_addr; 1734 1735 if (udc->usb_state == USB_STATE_ADDRESS) { 1736 /* set the new address */ 1737 new_addr = (u32)udc->dev_addr; 1738 writel(new_addr << USB_DEVICE_ADDRESS_BIT_SHIFT, 1739 &udc->op_regs->deviceaddr); 1740 } 1741 1742 done(ep0, req, 0); 1743 1744 switch (udc->ep0_state) { 1745 case DATA_STATE_XMIT: 1746 /* receive status phase */ 1747 if (udc_prime_status(udc, EP_DIR_OUT, 0, true)) 1748 ep0_stall(udc); 1749 break; 1750 case DATA_STATE_RECV: 1751 /* send status phase */ 1752 if (udc_prime_status(udc, EP_DIR_IN, 0 , true)) 1753 ep0_stall(udc); 1754 break; 1755 case WAIT_FOR_OUT_STATUS: 1756 udc->ep0_state = WAIT_FOR_SETUP; 1757 break; 1758 case WAIT_FOR_SETUP: 1759 dev_err(&udc->dev->dev, "unexpect ep0 packets\n"); 1760 break; 1761 default: 1762 ep0_stall(udc); 1763 break; 1764 } 1765 } 1766 1767 static void get_setup_data(struct mv_udc *udc, u8 ep_num, u8 *buffer_ptr) 1768 { 1769 u32 temp; 1770 struct mv_dqh *dqh; 1771 1772 dqh = &udc->ep_dqh[ep_num * 2 + EP_DIR_OUT]; 1773 1774 /* Clear bit in ENDPTSETUPSTAT */ 1775 writel((1 << ep_num), &udc->op_regs->epsetupstat); 1776 1777 /* while a hazard exists when setup package arrives */ 1778 do { 1779 /* Set Setup Tripwire */ 1780 temp = readl(&udc->op_regs->usbcmd); 1781 writel(temp | USBCMD_SETUP_TRIPWIRE_SET, &udc->op_regs->usbcmd); 1782 1783 /* Copy the setup packet to local buffer */ 1784 memcpy(buffer_ptr, (u8 *) dqh->setup_buffer, 8); 1785 } while (!(readl(&udc->op_regs->usbcmd) & USBCMD_SETUP_TRIPWIRE_SET)); 1786 1787 /* Clear Setup Tripwire */ 1788 temp = readl(&udc->op_regs->usbcmd); 1789 writel(temp & ~USBCMD_SETUP_TRIPWIRE_SET, &udc->op_regs->usbcmd); 1790 } 1791 1792 static void irq_process_tr_complete(struct mv_udc *udc) 1793 { 1794 u32 tmp, bit_pos; 1795 int i, ep_num = 0, direction = 0; 1796 struct mv_ep *curr_ep; 1797 struct mv_req *curr_req, *temp_req; 1798 int status; 1799 1800 /* 1801 * We use separate loops for ENDPTSETUPSTAT and ENDPTCOMPLETE 1802 * because the setup packets are to be read ASAP 1803 */ 1804 1805 /* Process all Setup packet received interrupts */ 1806 tmp = readl(&udc->op_regs->epsetupstat); 1807 1808 if (tmp) { 1809 for (i = 0; i < udc->max_eps; i++) { 1810 if (tmp & (1 << i)) { 1811 get_setup_data(udc, i, 1812 (u8 *)(&udc->local_setup_buff)); 1813 handle_setup_packet(udc, i, 1814 &udc->local_setup_buff); 1815 } 1816 } 1817 } 1818 1819 /* Don't clear the endpoint setup status register here. 1820 * It is cleared as a setup packet is read out of the buffer 1821 */ 1822 1823 /* Process non-setup transaction complete interrupts */ 1824 tmp = readl(&udc->op_regs->epcomplete); 1825 1826 if (!tmp) 1827 return; 1828 1829 writel(tmp, &udc->op_regs->epcomplete); 1830 1831 for (i = 0; i < udc->max_eps * 2; i++) { 1832 ep_num = i >> 1; 1833 direction = i % 2; 1834 1835 bit_pos = 1 << (ep_num + 16 * direction); 1836 1837 if (!(bit_pos & tmp)) 1838 continue; 1839 1840 if (i == 1) 1841 curr_ep = &udc->eps[0]; 1842 else 1843 curr_ep = &udc->eps[i]; 1844 /* process the req queue until an uncomplete request */ 1845 list_for_each_entry_safe(curr_req, temp_req, 1846 &curr_ep->queue, queue) { 1847 status = process_ep_req(udc, i, curr_req); 1848 if (status) 1849 break; 1850 1851 /* write back status to req */ 1852 curr_req->req.status = status; 1853 1854 /* ep0 request completion */ 1855 if (ep_num == 0) { 1856 ep0_req_complete(udc, curr_ep, curr_req); 1857 break; 1858 } else { 1859 done(curr_ep, curr_req, status); 1860 } 1861 } 1862 } 1863 } 1864 1865 static void irq_process_reset(struct mv_udc *udc) 1866 { 1867 u32 tmp; 1868 unsigned int loops; 1869 1870 udc->ep0_dir = EP_DIR_OUT; 1871 udc->ep0_state = WAIT_FOR_SETUP; 1872 udc->remote_wakeup = 0; /* default to 0 on reset */ 1873 1874 /* The address bits are past bit 25-31. Set the address */ 1875 tmp = readl(&udc->op_regs->deviceaddr); 1876 tmp &= ~(USB_DEVICE_ADDRESS_MASK); 1877 writel(tmp, &udc->op_regs->deviceaddr); 1878 1879 /* Clear all the setup token semaphores */ 1880 tmp = readl(&udc->op_regs->epsetupstat); 1881 writel(tmp, &udc->op_regs->epsetupstat); 1882 1883 /* Clear all the endpoint complete status bits */ 1884 tmp = readl(&udc->op_regs->epcomplete); 1885 writel(tmp, &udc->op_regs->epcomplete); 1886 1887 /* wait until all endptprime bits cleared */ 1888 loops = LOOPS(PRIME_TIMEOUT); 1889 while (readl(&udc->op_regs->epprime) & 0xFFFFFFFF) { 1890 if (loops == 0) { 1891 dev_err(&udc->dev->dev, 1892 "Timeout for ENDPTPRIME = 0x%x\n", 1893 readl(&udc->op_regs->epprime)); 1894 break; 1895 } 1896 loops--; 1897 udelay(LOOPS_USEC); 1898 } 1899 1900 /* Write 1s to the Flush register */ 1901 writel((u32)~0, &udc->op_regs->epflush); 1902 1903 if (readl(&udc->op_regs->portsc[0]) & PORTSCX_PORT_RESET) { 1904 dev_info(&udc->dev->dev, "usb bus reset\n"); 1905 udc->usb_state = USB_STATE_DEFAULT; 1906 /* reset all the queues, stop all USB activities */ 1907 gadget_reset(udc, udc->driver); 1908 } else { 1909 dev_info(&udc->dev->dev, "USB reset portsc 0x%x\n", 1910 readl(&udc->op_regs->portsc)); 1911 1912 /* 1913 * re-initialize 1914 * controller reset 1915 */ 1916 udc_reset(udc); 1917 1918 /* reset all the queues, stop all USB activities */ 1919 stop_activity(udc, udc->driver); 1920 1921 /* reset ep0 dQH and endptctrl */ 1922 ep0_reset(udc); 1923 1924 /* enable interrupt and set controller to run state */ 1925 udc_start(udc); 1926 1927 udc->usb_state = USB_STATE_ATTACHED; 1928 } 1929 } 1930 1931 static void handle_bus_resume(struct mv_udc *udc) 1932 { 1933 udc->usb_state = udc->resume_state; 1934 udc->resume_state = 0; 1935 1936 /* report resume to the driver */ 1937 if (udc->driver) { 1938 if (udc->driver->resume) { 1939 spin_unlock(&udc->lock); 1940 udc->driver->resume(&udc->gadget); 1941 spin_lock(&udc->lock); 1942 } 1943 } 1944 } 1945 1946 static void irq_process_suspend(struct mv_udc *udc) 1947 { 1948 udc->resume_state = udc->usb_state; 1949 udc->usb_state = USB_STATE_SUSPENDED; 1950 1951 if (udc->driver->suspend) { 1952 spin_unlock(&udc->lock); 1953 udc->driver->suspend(&udc->gadget); 1954 spin_lock(&udc->lock); 1955 } 1956 } 1957 1958 static void irq_process_port_change(struct mv_udc *udc) 1959 { 1960 u32 portsc; 1961 1962 portsc = readl(&udc->op_regs->portsc[0]); 1963 if (!(portsc & PORTSCX_PORT_RESET)) { 1964 /* Get the speed */ 1965 u32 speed = portsc & PORTSCX_PORT_SPEED_MASK; 1966 switch (speed) { 1967 case PORTSCX_PORT_SPEED_HIGH: 1968 udc->gadget.speed = USB_SPEED_HIGH; 1969 break; 1970 case PORTSCX_PORT_SPEED_FULL: 1971 udc->gadget.speed = USB_SPEED_FULL; 1972 break; 1973 case PORTSCX_PORT_SPEED_LOW: 1974 udc->gadget.speed = USB_SPEED_LOW; 1975 break; 1976 default: 1977 udc->gadget.speed = USB_SPEED_UNKNOWN; 1978 break; 1979 } 1980 } 1981 1982 if (portsc & PORTSCX_PORT_SUSPEND) { 1983 udc->resume_state = udc->usb_state; 1984 udc->usb_state = USB_STATE_SUSPENDED; 1985 if (udc->driver->suspend) { 1986 spin_unlock(&udc->lock); 1987 udc->driver->suspend(&udc->gadget); 1988 spin_lock(&udc->lock); 1989 } 1990 } 1991 1992 if (!(portsc & PORTSCX_PORT_SUSPEND) 1993 && udc->usb_state == USB_STATE_SUSPENDED) { 1994 handle_bus_resume(udc); 1995 } 1996 1997 if (!udc->resume_state) 1998 udc->usb_state = USB_STATE_DEFAULT; 1999 } 2000 2001 static void irq_process_error(struct mv_udc *udc) 2002 { 2003 /* Increment the error count */ 2004 udc->errors++; 2005 } 2006 2007 static irqreturn_t mv_udc_irq(int irq, void *dev) 2008 { 2009 struct mv_udc *udc = (struct mv_udc *)dev; 2010 u32 status, intr; 2011 2012 /* Disable ISR when stopped bit is set */ 2013 if (udc->stopped) 2014 return IRQ_NONE; 2015 2016 spin_lock(&udc->lock); 2017 2018 status = readl(&udc->op_regs->usbsts); 2019 intr = readl(&udc->op_regs->usbintr); 2020 status &= intr; 2021 2022 if (status == 0) { 2023 spin_unlock(&udc->lock); 2024 return IRQ_NONE; 2025 } 2026 2027 /* Clear all the interrupts occurred */ 2028 writel(status, &udc->op_regs->usbsts); 2029 2030 if (status & USBSTS_ERR) 2031 irq_process_error(udc); 2032 2033 if (status & USBSTS_RESET) 2034 irq_process_reset(udc); 2035 2036 if (status & USBSTS_PORT_CHANGE) 2037 irq_process_port_change(udc); 2038 2039 if (status & USBSTS_INT) 2040 irq_process_tr_complete(udc); 2041 2042 if (status & USBSTS_SUSPEND) 2043 irq_process_suspend(udc); 2044 2045 spin_unlock(&udc->lock); 2046 2047 return IRQ_HANDLED; 2048 } 2049 2050 static irqreturn_t mv_udc_vbus_irq(int irq, void *dev) 2051 { 2052 struct mv_udc *udc = (struct mv_udc *)dev; 2053 2054 /* polling VBUS and init phy may cause too much time*/ 2055 if (udc->qwork) 2056 queue_work(udc->qwork, &udc->vbus_work); 2057 2058 return IRQ_HANDLED; 2059 } 2060 2061 static void mv_udc_vbus_work(struct work_struct *work) 2062 { 2063 struct mv_udc *udc; 2064 unsigned int vbus; 2065 2066 udc = container_of(work, struct mv_udc, vbus_work); 2067 if (!udc->pdata->vbus) 2068 return; 2069 2070 vbus = udc->pdata->vbus->poll(); 2071 dev_info(&udc->dev->dev, "vbus is %d\n", vbus); 2072 2073 if (vbus == VBUS_HIGH) 2074 mv_udc_vbus_session(&udc->gadget, 1); 2075 else if (vbus == VBUS_LOW) 2076 mv_udc_vbus_session(&udc->gadget, 0); 2077 } 2078 2079 /* release device structure */ 2080 static void gadget_release(struct device *_dev) 2081 { 2082 struct mv_udc *udc; 2083 2084 udc = dev_get_drvdata(_dev); 2085 2086 complete(udc->done); 2087 } 2088 2089 static int mv_udc_remove(struct platform_device *pdev) 2090 { 2091 struct mv_udc *udc; 2092 2093 udc = platform_get_drvdata(pdev); 2094 2095 usb_del_gadget_udc(&udc->gadget); 2096 2097 if (udc->qwork) { 2098 flush_workqueue(udc->qwork); 2099 destroy_workqueue(udc->qwork); 2100 } 2101 2102 /* free memory allocated in probe */ 2103 dma_pool_destroy(udc->dtd_pool); 2104 2105 if (udc->ep_dqh) 2106 dma_free_coherent(&pdev->dev, udc->ep_dqh_size, 2107 udc->ep_dqh, udc->ep_dqh_dma); 2108 2109 mv_udc_disable(udc); 2110 2111 /* free dev, wait for the release() finished */ 2112 wait_for_completion(udc->done); 2113 2114 return 0; 2115 } 2116 2117 static int mv_udc_probe(struct platform_device *pdev) 2118 { 2119 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); 2120 struct mv_udc *udc; 2121 int retval = 0; 2122 struct resource *r; 2123 size_t size; 2124 2125 if (pdata == NULL) { 2126 dev_err(&pdev->dev, "missing platform_data\n"); 2127 return -ENODEV; 2128 } 2129 2130 udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL); 2131 if (udc == NULL) 2132 return -ENOMEM; 2133 2134 udc->done = &release_done; 2135 udc->pdata = dev_get_platdata(&pdev->dev); 2136 spin_lock_init(&udc->lock); 2137 2138 udc->dev = pdev; 2139 2140 if (pdata->mode == MV_USB_MODE_OTG) { 2141 udc->transceiver = devm_usb_get_phy(&pdev->dev, 2142 USB_PHY_TYPE_USB2); 2143 if (IS_ERR(udc->transceiver)) { 2144 retval = PTR_ERR(udc->transceiver); 2145 2146 if (retval == -ENXIO) 2147 return retval; 2148 2149 udc->transceiver = NULL; 2150 return -EPROBE_DEFER; 2151 } 2152 } 2153 2154 /* udc only have one sysclk. */ 2155 udc->clk = devm_clk_get(&pdev->dev, NULL); 2156 if (IS_ERR(udc->clk)) 2157 return PTR_ERR(udc->clk); 2158 2159 r = platform_get_resource_byname(udc->dev, IORESOURCE_MEM, "capregs"); 2160 if (r == NULL) { 2161 dev_err(&pdev->dev, "no I/O memory resource defined\n"); 2162 return -ENODEV; 2163 } 2164 2165 udc->cap_regs = (struct mv_cap_regs __iomem *) 2166 devm_ioremap(&pdev->dev, r->start, resource_size(r)); 2167 if (udc->cap_regs == NULL) { 2168 dev_err(&pdev->dev, "failed to map I/O memory\n"); 2169 return -EBUSY; 2170 } 2171 2172 r = platform_get_resource_byname(udc->dev, IORESOURCE_MEM, "phyregs"); 2173 if (r == NULL) { 2174 dev_err(&pdev->dev, "no phy I/O memory resource defined\n"); 2175 return -ENODEV; 2176 } 2177 2178 udc->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r)); 2179 if (udc->phy_regs == NULL) { 2180 dev_err(&pdev->dev, "failed to map phy I/O memory\n"); 2181 return -EBUSY; 2182 } 2183 2184 /* we will acces controller register, so enable the clk */ 2185 retval = mv_udc_enable_internal(udc); 2186 if (retval) 2187 return retval; 2188 2189 udc->op_regs = 2190 (struct mv_op_regs __iomem *)((unsigned long)udc->cap_regs 2191 + (readl(&udc->cap_regs->caplength_hciversion) 2192 & CAPLENGTH_MASK)); 2193 udc->max_eps = readl(&udc->cap_regs->dccparams) & DCCPARAMS_DEN_MASK; 2194 2195 /* 2196 * some platform will use usb to download image, it may not disconnect 2197 * usb gadget before loading kernel. So first stop udc here. 2198 */ 2199 udc_stop(udc); 2200 writel(0xFFFFFFFF, &udc->op_regs->usbsts); 2201 2202 size = udc->max_eps * sizeof(struct mv_dqh) *2; 2203 size = (size + DQH_ALIGNMENT - 1) & ~(DQH_ALIGNMENT - 1); 2204 udc->ep_dqh = dma_alloc_coherent(&pdev->dev, size, 2205 &udc->ep_dqh_dma, GFP_KERNEL); 2206 2207 if (udc->ep_dqh == NULL) { 2208 dev_err(&pdev->dev, "allocate dQH memory failed\n"); 2209 retval = -ENOMEM; 2210 goto err_disable_clock; 2211 } 2212 udc->ep_dqh_size = size; 2213 2214 /* create dTD dma_pool resource */ 2215 udc->dtd_pool = dma_pool_create("mv_dtd", 2216 &pdev->dev, 2217 sizeof(struct mv_dtd), 2218 DTD_ALIGNMENT, 2219 DMA_BOUNDARY); 2220 2221 if (!udc->dtd_pool) { 2222 retval = -ENOMEM; 2223 goto err_free_dma; 2224 } 2225 2226 size = udc->max_eps * sizeof(struct mv_ep) *2; 2227 udc->eps = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); 2228 if (udc->eps == NULL) { 2229 retval = -ENOMEM; 2230 goto err_destroy_dma; 2231 } 2232 2233 /* initialize ep0 status request structure */ 2234 udc->status_req = devm_kzalloc(&pdev->dev, sizeof(struct mv_req), 2235 GFP_KERNEL); 2236 if (!udc->status_req) { 2237 retval = -ENOMEM; 2238 goto err_destroy_dma; 2239 } 2240 INIT_LIST_HEAD(&udc->status_req->queue); 2241 2242 /* allocate a small amount of memory to get valid address */ 2243 udc->status_req->req.buf = kzalloc(8, GFP_KERNEL); 2244 udc->status_req->req.dma = DMA_ADDR_INVALID; 2245 2246 udc->resume_state = USB_STATE_NOTATTACHED; 2247 udc->usb_state = USB_STATE_POWERED; 2248 udc->ep0_dir = EP_DIR_OUT; 2249 udc->remote_wakeup = 0; 2250 2251 r = platform_get_resource(udc->dev, IORESOURCE_IRQ, 0); 2252 if (r == NULL) { 2253 dev_err(&pdev->dev, "no IRQ resource defined\n"); 2254 retval = -ENODEV; 2255 goto err_destroy_dma; 2256 } 2257 udc->irq = r->start; 2258 if (devm_request_irq(&pdev->dev, udc->irq, mv_udc_irq, 2259 IRQF_SHARED, driver_name, udc)) { 2260 dev_err(&pdev->dev, "Request irq %d for UDC failed\n", 2261 udc->irq); 2262 retval = -ENODEV; 2263 goto err_destroy_dma; 2264 } 2265 2266 /* initialize gadget structure */ 2267 udc->gadget.ops = &mv_ops; /* usb_gadget_ops */ 2268 udc->gadget.ep0 = &udc->eps[0].ep; /* gadget ep0 */ 2269 INIT_LIST_HEAD(&udc->gadget.ep_list); /* ep_list */ 2270 udc->gadget.speed = USB_SPEED_UNKNOWN; /* speed */ 2271 udc->gadget.max_speed = USB_SPEED_HIGH; /* support dual speed */ 2272 2273 /* the "gadget" abstracts/virtualizes the controller */ 2274 udc->gadget.name = driver_name; /* gadget name */ 2275 2276 eps_init(udc); 2277 2278 /* VBUS detect: we can disable/enable clock on demand.*/ 2279 if (udc->transceiver) 2280 udc->clock_gating = 1; 2281 else if (pdata->vbus) { 2282 udc->clock_gating = 1; 2283 retval = devm_request_threaded_irq(&pdev->dev, 2284 pdata->vbus->irq, NULL, 2285 mv_udc_vbus_irq, IRQF_ONESHOT, "vbus", udc); 2286 if (retval) { 2287 dev_info(&pdev->dev, 2288 "Can not request irq for VBUS, " 2289 "disable clock gating\n"); 2290 udc->clock_gating = 0; 2291 } 2292 2293 udc->qwork = create_singlethread_workqueue("mv_udc_queue"); 2294 if (!udc->qwork) { 2295 dev_err(&pdev->dev, "cannot create workqueue\n"); 2296 retval = -ENOMEM; 2297 goto err_destroy_dma; 2298 } 2299 2300 INIT_WORK(&udc->vbus_work, mv_udc_vbus_work); 2301 } 2302 2303 /* 2304 * When clock gating is supported, we can disable clk and phy. 2305 * If not, it means that VBUS detection is not supported, we 2306 * have to enable vbus active all the time to let controller work. 2307 */ 2308 if (udc->clock_gating) 2309 mv_udc_disable_internal(udc); 2310 else 2311 udc->vbus_active = 1; 2312 2313 retval = usb_add_gadget_udc_release(&pdev->dev, &udc->gadget, 2314 gadget_release); 2315 if (retval) 2316 goto err_create_workqueue; 2317 2318 platform_set_drvdata(pdev, udc); 2319 dev_info(&pdev->dev, "successful probe UDC device %s clock gating.\n", 2320 udc->clock_gating ? "with" : "without"); 2321 2322 return 0; 2323 2324 err_create_workqueue: 2325 destroy_workqueue(udc->qwork); 2326 err_destroy_dma: 2327 dma_pool_destroy(udc->dtd_pool); 2328 err_free_dma: 2329 dma_free_coherent(&pdev->dev, udc->ep_dqh_size, 2330 udc->ep_dqh, udc->ep_dqh_dma); 2331 err_disable_clock: 2332 mv_udc_disable_internal(udc); 2333 2334 return retval; 2335 } 2336 2337 #ifdef CONFIG_PM 2338 static int mv_udc_suspend(struct device *dev) 2339 { 2340 struct mv_udc *udc; 2341 2342 udc = dev_get_drvdata(dev); 2343 2344 /* if OTG is enabled, the following will be done in OTG driver*/ 2345 if (udc->transceiver) 2346 return 0; 2347 2348 if (udc->pdata->vbus && udc->pdata->vbus->poll) 2349 if (udc->pdata->vbus->poll() == VBUS_HIGH) { 2350 dev_info(&udc->dev->dev, "USB cable is connected!\n"); 2351 return -EAGAIN; 2352 } 2353 2354 /* 2355 * only cable is unplugged, udc can suspend. 2356 * So do not care about clock_gating == 1. 2357 */ 2358 if (!udc->clock_gating) { 2359 udc_stop(udc); 2360 2361 spin_lock_irq(&udc->lock); 2362 /* stop all usb activities */ 2363 stop_activity(udc, udc->driver); 2364 spin_unlock_irq(&udc->lock); 2365 2366 mv_udc_disable_internal(udc); 2367 } 2368 2369 return 0; 2370 } 2371 2372 static int mv_udc_resume(struct device *dev) 2373 { 2374 struct mv_udc *udc; 2375 int retval; 2376 2377 udc = dev_get_drvdata(dev); 2378 2379 /* if OTG is enabled, the following will be done in OTG driver*/ 2380 if (udc->transceiver) 2381 return 0; 2382 2383 if (!udc->clock_gating) { 2384 retval = mv_udc_enable_internal(udc); 2385 if (retval) 2386 return retval; 2387 2388 if (udc->driver && udc->softconnect) { 2389 udc_reset(udc); 2390 ep0_reset(udc); 2391 udc_start(udc); 2392 } 2393 } 2394 2395 return 0; 2396 } 2397 2398 static const struct dev_pm_ops mv_udc_pm_ops = { 2399 .suspend = mv_udc_suspend, 2400 .resume = mv_udc_resume, 2401 }; 2402 #endif 2403 2404 static void mv_udc_shutdown(struct platform_device *pdev) 2405 { 2406 struct mv_udc *udc; 2407 u32 mode; 2408 2409 udc = platform_get_drvdata(pdev); 2410 /* reset controller mode to IDLE */ 2411 mv_udc_enable(udc); 2412 mode = readl(&udc->op_regs->usbmode); 2413 mode &= ~3; 2414 writel(mode, &udc->op_regs->usbmode); 2415 mv_udc_disable(udc); 2416 } 2417 2418 static struct platform_driver udc_driver = { 2419 .probe = mv_udc_probe, 2420 .remove = mv_udc_remove, 2421 .shutdown = mv_udc_shutdown, 2422 .driver = { 2423 .name = "mv-udc", 2424 #ifdef CONFIG_PM 2425 .pm = &mv_udc_pm_ops, 2426 #endif 2427 }, 2428 }; 2429 2430 module_platform_driver(udc_driver); 2431 MODULE_ALIAS("platform:mv-udc"); 2432 MODULE_DESCRIPTION(DRIVER_DESC); 2433 MODULE_AUTHOR("Chao Xie <chao.xie@marvell.com>"); 2434 MODULE_VERSION(DRIVER_VERSION); 2435 MODULE_LICENSE("GPL"); 2436