1/* 2 * udc.c - ChipIdea UDC driver 3 * 4 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved. 5 * 6 * Author: David Lopo 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13#include <linux/delay.h> 14#include <linux/device.h> 15#include <linux/dmapool.h> 16#include <linux/err.h> 17#include <linux/irqreturn.h> 18#include <linux/kernel.h> 19#include <linux/slab.h> 20#include <linux/pm_runtime.h> 21#include <linux/usb/ch9.h> 22#include <linux/usb/gadget.h> 23#include <linux/usb/otg-fsm.h> 24#include <linux/usb/chipidea.h> 25 26#include "ci.h" 27#include "udc.h" 28#include "bits.h" 29#include "debug.h" 30#include "otg.h" 31#include "otg_fsm.h" 32 33/* control endpoint description */ 34static const struct usb_endpoint_descriptor 35ctrl_endpt_out_desc = { 36 .bLength = USB_DT_ENDPOINT_SIZE, 37 .bDescriptorType = USB_DT_ENDPOINT, 38 39 .bEndpointAddress = USB_DIR_OUT, 40 .bmAttributes = USB_ENDPOINT_XFER_CONTROL, 41 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX), 42}; 43 44static const struct usb_endpoint_descriptor 45ctrl_endpt_in_desc = { 46 .bLength = USB_DT_ENDPOINT_SIZE, 47 .bDescriptorType = USB_DT_ENDPOINT, 48 49 .bEndpointAddress = USB_DIR_IN, 50 .bmAttributes = USB_ENDPOINT_XFER_CONTROL, 51 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX), 52}; 53 54/** 55 * hw_ep_bit: calculates the bit number 56 * @num: endpoint number 57 * @dir: endpoint direction 58 * 59 * This function returns bit number 60 */ 61static inline int hw_ep_bit(int num, int dir) 62{ 63 return num + (dir ? 16 : 0); 64} 65 66static inline int ep_to_bit(struct ci_hdrc *ci, int n) 67{ 68 int fill = 16 - ci->hw_ep_max / 2; 69 70 if (n >= ci->hw_ep_max / 2) 71 n += fill; 72 73 return n; 74} 75 76/** 77 * hw_device_state: enables/disables interrupts (execute without interruption) 78 * @dma: 0 => disable, !0 => enable and set dma engine 79 * 80 * This function returns an error code 81 */ 82static int hw_device_state(struct ci_hdrc *ci, u32 dma) 83{ 84 if (dma) { 85 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma); 86 /* interrupt, error, port change, reset, sleep/suspend */ 87 hw_write(ci, OP_USBINTR, ~0, 88 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI); 89 } else { 90 hw_write(ci, OP_USBINTR, ~0, 0); 91 } 92 return 0; 93} 94 95/** 96 * hw_ep_flush: flush endpoint fifo (execute without interruption) 97 * @num: endpoint number 98 * @dir: endpoint direction 99 * 100 * This function returns an error code 101 */ 102static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir) 103{ 104 int n = hw_ep_bit(num, dir); 105 106 do { 107 /* flush any pending transfer */ 108 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n)); 109 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n))) 110 cpu_relax(); 111 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n))); 112 113 return 0; 114} 115 116/** 117 * hw_ep_disable: disables endpoint (execute without interruption) 118 * @num: endpoint number 119 * @dir: endpoint direction 120 * 121 * This function returns an error code 122 */ 123static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir) 124{ 125 hw_ep_flush(ci, num, dir); 126 hw_write(ci, OP_ENDPTCTRL + num, 127 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0); 128 return 0; 129} 130 131/** 132 * hw_ep_enable: enables endpoint (execute without interruption) 133 * @num: endpoint number 134 * @dir: endpoint direction 135 * @type: endpoint type 136 * 137 * This function returns an error code 138 */ 139static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type) 140{ 141 u32 mask, data; 142 143 if (dir) { 144 mask = ENDPTCTRL_TXT; /* type */ 145 data = type << __ffs(mask); 146 147 mask |= ENDPTCTRL_TXS; /* unstall */ 148 mask |= ENDPTCTRL_TXR; /* reset data toggle */ 149 data |= ENDPTCTRL_TXR; 150 mask |= ENDPTCTRL_TXE; /* enable */ 151 data |= ENDPTCTRL_TXE; 152 } else { 153 mask = ENDPTCTRL_RXT; /* type */ 154 data = type << __ffs(mask); 155 156 mask |= ENDPTCTRL_RXS; /* unstall */ 157 mask |= ENDPTCTRL_RXR; /* reset data toggle */ 158 data |= ENDPTCTRL_RXR; 159 mask |= ENDPTCTRL_RXE; /* enable */ 160 data |= ENDPTCTRL_RXE; 161 } 162 hw_write(ci, OP_ENDPTCTRL + num, mask, data); 163 return 0; 164} 165 166/** 167 * hw_ep_get_halt: return endpoint halt status 168 * @num: endpoint number 169 * @dir: endpoint direction 170 * 171 * This function returns 1 if endpoint halted 172 */ 173static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir) 174{ 175 u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS; 176 177 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0; 178} 179 180/** 181 * hw_ep_prime: primes endpoint (execute without interruption) 182 * @num: endpoint number 183 * @dir: endpoint direction 184 * @is_ctrl: true if control endpoint 185 * 186 * This function returns an error code 187 */ 188static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl) 189{ 190 int n = hw_ep_bit(num, dir); 191 192 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num))) 193 return -EAGAIN; 194 195 hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n)); 196 197 while (hw_read(ci, OP_ENDPTPRIME, BIT(n))) 198 cpu_relax(); 199 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num))) 200 return -EAGAIN; 201 202 /* status shoult be tested according with manual but it doesn't work */ 203 return 0; 204} 205 206/** 207 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute 208 * without interruption) 209 * @num: endpoint number 210 * @dir: endpoint direction 211 * @value: true => stall, false => unstall 212 * 213 * This function returns an error code 214 */ 215static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value) 216{ 217 if (value != 0 && value != 1) 218 return -EINVAL; 219 220 do { 221 enum ci_hw_regs reg = OP_ENDPTCTRL + num; 222 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS; 223 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR; 224 225 /* data toggle - reserved for EP0 but it's in ESS */ 226 hw_write(ci, reg, mask_xs|mask_xr, 227 value ? mask_xs : mask_xr); 228 } while (value != hw_ep_get_halt(ci, num, dir)); 229 230 return 0; 231} 232 233/** 234 * hw_is_port_high_speed: test if port is high speed 235 * 236 * This function returns true if high speed port 237 */ 238static int hw_port_is_high_speed(struct ci_hdrc *ci) 239{ 240 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) : 241 hw_read(ci, OP_PORTSC, PORTSC_HSP); 242} 243 244/** 245 * hw_test_and_clear_complete: test & clear complete status (execute without 246 * interruption) 247 * @n: endpoint number 248 * 249 * This function returns complete status 250 */ 251static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n) 252{ 253 n = ep_to_bit(ci, n); 254 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n)); 255} 256 257/** 258 * hw_test_and_clear_intr_active: test & clear active interrupts (execute 259 * without interruption) 260 * 261 * This function returns active interrutps 262 */ 263static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci) 264{ 265 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci); 266 267 hw_write(ci, OP_USBSTS, ~0, reg); 268 return reg; 269} 270 271/** 272 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without 273 * interruption) 274 * 275 * This function returns guard value 276 */ 277static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci) 278{ 279 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0); 280} 281 282/** 283 * hw_test_and_set_setup_guard: test & set setup guard (execute without 284 * interruption) 285 * 286 * This function returns guard value 287 */ 288static int hw_test_and_set_setup_guard(struct ci_hdrc *ci) 289{ 290 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW); 291} 292 293/** 294 * hw_usb_set_address: configures USB address (execute without interruption) 295 * @value: new USB address 296 * 297 * This function explicitly sets the address, without the "USBADRA" (advance) 298 * feature, which is not supported by older versions of the controller. 299 */ 300static void hw_usb_set_address(struct ci_hdrc *ci, u8 value) 301{ 302 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR, 303 value << __ffs(DEVICEADDR_USBADR)); 304} 305 306/** 307 * hw_usb_reset: restart device after a bus reset (execute without 308 * interruption) 309 * 310 * This function returns an error code 311 */ 312static int hw_usb_reset(struct ci_hdrc *ci) 313{ 314 hw_usb_set_address(ci, 0); 315 316 /* ESS flushes only at end?!? */ 317 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0); 318 319 /* clear setup token semaphores */ 320 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0); 321 322 /* clear complete status */ 323 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0); 324 325 /* wait until all bits cleared */ 326 while (hw_read(ci, OP_ENDPTPRIME, ~0)) 327 udelay(10); /* not RTOS friendly */ 328 329 /* reset all endpoints ? */ 330 331 /* reset internal status and wait for further instructions 332 no need to verify the port reset status (ESS does it) */ 333 334 return 0; 335} 336 337/****************************************************************************** 338 * UTIL block 339 *****************************************************************************/ 340 341static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq, 342 unsigned length) 343{ 344 int i; 345 u32 temp; 346 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node), 347 GFP_ATOMIC); 348 349 if (node == NULL) 350 return -ENOMEM; 351 352 node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC, 353 &node->dma); 354 if (node->ptr == NULL) { 355 kfree(node); 356 return -ENOMEM; 357 } 358 359 memset(node->ptr, 0, sizeof(struct ci_hw_td)); 360 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES)); 361 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES); 362 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE); 363 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) { 364 u32 mul = hwreq->req.length / hwep->ep.maxpacket; 365 366 if (hwreq->req.length == 0 367 || hwreq->req.length % hwep->ep.maxpacket) 368 mul++; 369 node->ptr->token |= mul << __ffs(TD_MULTO); 370 } 371 372 temp = (u32) (hwreq->req.dma + hwreq->req.actual); 373 if (length) { 374 node->ptr->page[0] = cpu_to_le32(temp); 375 for (i = 1; i < TD_PAGE_COUNT; i++) { 376 u32 page = temp + i * CI_HDRC_PAGE_SIZE; 377 page &= ~TD_RESERVED_MASK; 378 node->ptr->page[i] = cpu_to_le32(page); 379 } 380 } 381 382 hwreq->req.actual += length; 383 384 if (!list_empty(&hwreq->tds)) { 385 /* get the last entry */ 386 lastnode = list_entry(hwreq->tds.prev, 387 struct td_node, td); 388 lastnode->ptr->next = cpu_to_le32(node->dma); 389 } 390 391 INIT_LIST_HEAD(&node->td); 392 list_add_tail(&node->td, &hwreq->tds); 393 394 return 0; 395} 396 397/** 398 * _usb_addr: calculates endpoint address from direction & number 399 * @ep: endpoint 400 */ 401static inline u8 _usb_addr(struct ci_hw_ep *ep) 402{ 403 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num; 404} 405 406/** 407 * _hardware_queue: configures a request at hardware level 408 * @gadget: gadget 409 * @hwep: endpoint 410 * 411 * This function returns an error code 412 */ 413static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq) 414{ 415 struct ci_hdrc *ci = hwep->ci; 416 int ret = 0; 417 unsigned rest = hwreq->req.length; 418 int pages = TD_PAGE_COUNT; 419 struct td_node *firstnode, *lastnode; 420 421 /* don't queue twice */ 422 if (hwreq->req.status == -EALREADY) 423 return -EALREADY; 424 425 hwreq->req.status = -EALREADY; 426 427 ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir); 428 if (ret) 429 return ret; 430 431 /* 432 * The first buffer could be not page aligned. 433 * In that case we have to span into one extra td. 434 */ 435 if (hwreq->req.dma % PAGE_SIZE) 436 pages--; 437 438 if (rest == 0) 439 add_td_to_list(hwep, hwreq, 0); 440 441 while (rest > 0) { 442 unsigned count = min(hwreq->req.length - hwreq->req.actual, 443 (unsigned)(pages * CI_HDRC_PAGE_SIZE)); 444 add_td_to_list(hwep, hwreq, count); 445 rest -= count; 446 } 447 448 if (hwreq->req.zero && hwreq->req.length 449 && (hwreq->req.length % hwep->ep.maxpacket == 0)) 450 add_td_to_list(hwep, hwreq, 0); 451 452 firstnode = list_first_entry(&hwreq->tds, struct td_node, td); 453 454 lastnode = list_entry(hwreq->tds.prev, 455 struct td_node, td); 456 457 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE); 458 if (!hwreq->req.no_interrupt) 459 lastnode->ptr->token |= cpu_to_le32(TD_IOC); 460 wmb(); 461 462 hwreq->req.actual = 0; 463 if (!list_empty(&hwep->qh.queue)) { 464 struct ci_hw_req *hwreqprev; 465 int n = hw_ep_bit(hwep->num, hwep->dir); 466 int tmp_stat; 467 struct td_node *prevlastnode; 468 u32 next = firstnode->dma & TD_ADDR_MASK; 469 470 hwreqprev = list_entry(hwep->qh.queue.prev, 471 struct ci_hw_req, queue); 472 prevlastnode = list_entry(hwreqprev->tds.prev, 473 struct td_node, td); 474 475 prevlastnode->ptr->next = cpu_to_le32(next); 476 wmb(); 477 if (hw_read(ci, OP_ENDPTPRIME, BIT(n))) 478 goto done; 479 do { 480 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW); 481 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n)); 482 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW)); 483 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0); 484 if (tmp_stat) 485 goto done; 486 } 487 488 /* QH configuration */ 489 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma); 490 hwep->qh.ptr->td.token &= 491 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE)); 492 493 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) { 494 u32 mul = hwreq->req.length / hwep->ep.maxpacket; 495 496 if (hwreq->req.length == 0 497 || hwreq->req.length % hwep->ep.maxpacket) 498 mul++; 499 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT); 500 } 501 502 wmb(); /* synchronize before ep prime */ 503 504 ret = hw_ep_prime(ci, hwep->num, hwep->dir, 505 hwep->type == USB_ENDPOINT_XFER_CONTROL); 506done: 507 return ret; 508} 509 510/* 511 * free_pending_td: remove a pending request for the endpoint 512 * @hwep: endpoint 513 */ 514static void free_pending_td(struct ci_hw_ep *hwep) 515{ 516 struct td_node *pending = hwep->pending_td; 517 518 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma); 519 hwep->pending_td = NULL; 520 kfree(pending); 521} 522 523static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep, 524 struct td_node *node) 525{ 526 hwep->qh.ptr->td.next = node->dma; 527 hwep->qh.ptr->td.token &= 528 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE)); 529 530 /* Synchronize before ep prime */ 531 wmb(); 532 533 return hw_ep_prime(ci, hwep->num, hwep->dir, 534 hwep->type == USB_ENDPOINT_XFER_CONTROL); 535} 536 537/** 538 * _hardware_dequeue: handles a request at hardware level 539 * @gadget: gadget 540 * @hwep: endpoint 541 * 542 * This function returns an error code 543 */ 544static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq) 545{ 546 u32 tmptoken; 547 struct td_node *node, *tmpnode; 548 unsigned remaining_length; 549 unsigned actual = hwreq->req.length; 550 struct ci_hdrc *ci = hwep->ci; 551 552 if (hwreq->req.status != -EALREADY) 553 return -EINVAL; 554 555 hwreq->req.status = 0; 556 557 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) { 558 tmptoken = le32_to_cpu(node->ptr->token); 559 if ((TD_STATUS_ACTIVE & tmptoken) != 0) { 560 int n = hw_ep_bit(hwep->num, hwep->dir); 561 562 if (ci->rev == CI_REVISION_24) 563 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n))) 564 reprime_dtd(ci, hwep, node); 565 hwreq->req.status = -EALREADY; 566 return -EBUSY; 567 } 568 569 remaining_length = (tmptoken & TD_TOTAL_BYTES); 570 remaining_length >>= __ffs(TD_TOTAL_BYTES); 571 actual -= remaining_length; 572 573 hwreq->req.status = tmptoken & TD_STATUS; 574 if ((TD_STATUS_HALTED & hwreq->req.status)) { 575 hwreq->req.status = -EPIPE; 576 break; 577 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) { 578 hwreq->req.status = -EPROTO; 579 break; 580 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) { 581 hwreq->req.status = -EILSEQ; 582 break; 583 } 584 585 if (remaining_length) { 586 if (hwep->dir) { 587 hwreq->req.status = -EPROTO; 588 break; 589 } 590 } 591 /* 592 * As the hardware could still address the freed td 593 * which will run the udc unusable, the cleanup of the 594 * td has to be delayed by one. 595 */ 596 if (hwep->pending_td) 597 free_pending_td(hwep); 598 599 hwep->pending_td = node; 600 list_del_init(&node->td); 601 } 602 603 usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir); 604 605 hwreq->req.actual += actual; 606 607 if (hwreq->req.status) 608 return hwreq->req.status; 609 610 return hwreq->req.actual; 611} 612 613/** 614 * _ep_nuke: dequeues all endpoint requests 615 * @hwep: endpoint 616 * 617 * This function returns an error code 618 * Caller must hold lock 619 */ 620static int _ep_nuke(struct ci_hw_ep *hwep) 621__releases(hwep->lock) 622__acquires(hwep->lock) 623{ 624 struct td_node *node, *tmpnode; 625 if (hwep == NULL) 626 return -EINVAL; 627 628 hw_ep_flush(hwep->ci, hwep->num, hwep->dir); 629 630 while (!list_empty(&hwep->qh.queue)) { 631 632 /* pop oldest request */ 633 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next, 634 struct ci_hw_req, queue); 635 636 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) { 637 dma_pool_free(hwep->td_pool, node->ptr, node->dma); 638 list_del_init(&node->td); 639 node->ptr = NULL; 640 kfree(node); 641 } 642 643 list_del_init(&hwreq->queue); 644 hwreq->req.status = -ESHUTDOWN; 645 646 if (hwreq->req.complete != NULL) { 647 spin_unlock(hwep->lock); 648 usb_gadget_giveback_request(&hwep->ep, &hwreq->req); 649 spin_lock(hwep->lock); 650 } 651 } 652 653 if (hwep->pending_td) 654 free_pending_td(hwep); 655 656 return 0; 657} 658 659static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer) 660{ 661 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 662 int direction, retval = 0; 663 unsigned long flags; 664 665 if (ep == NULL || hwep->ep.desc == NULL) 666 return -EINVAL; 667 668 if (usb_endpoint_xfer_isoc(hwep->ep.desc)) 669 return -EOPNOTSUPP; 670 671 spin_lock_irqsave(hwep->lock, flags); 672 673 if (value && hwep->dir == TX && check_transfer && 674 !list_empty(&hwep->qh.queue) && 675 !usb_endpoint_xfer_control(hwep->ep.desc)) { 676 spin_unlock_irqrestore(hwep->lock, flags); 677 return -EAGAIN; 678 } 679 680 direction = hwep->dir; 681 do { 682 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value); 683 684 if (!value) 685 hwep->wedge = 0; 686 687 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) 688 hwep->dir = (hwep->dir == TX) ? RX : TX; 689 690 } while (hwep->dir != direction); 691 692 spin_unlock_irqrestore(hwep->lock, flags); 693 return retval; 694} 695 696 697/** 698 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts 699 * @gadget: gadget 700 * 701 * This function returns an error code 702 */ 703static int _gadget_stop_activity(struct usb_gadget *gadget) 704{ 705 struct usb_ep *ep; 706 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget); 707 unsigned long flags; 708 709 spin_lock_irqsave(&ci->lock, flags); 710 ci->gadget.speed = USB_SPEED_UNKNOWN; 711 ci->remote_wakeup = 0; 712 ci->suspended = 0; 713 spin_unlock_irqrestore(&ci->lock, flags); 714 715 /* flush all endpoints */ 716 gadget_for_each_ep(ep, gadget) { 717 usb_ep_fifo_flush(ep); 718 } 719 usb_ep_fifo_flush(&ci->ep0out->ep); 720 usb_ep_fifo_flush(&ci->ep0in->ep); 721 722 /* make sure to disable all endpoints */ 723 gadget_for_each_ep(ep, gadget) { 724 usb_ep_disable(ep); 725 } 726 727 if (ci->status != NULL) { 728 usb_ep_free_request(&ci->ep0in->ep, ci->status); 729 ci->status = NULL; 730 } 731 732 return 0; 733} 734 735/****************************************************************************** 736 * ISR block 737 *****************************************************************************/ 738/** 739 * isr_reset_handler: USB reset interrupt handler 740 * @ci: UDC device 741 * 742 * This function resets USB engine after a bus reset occurred 743 */ 744static void isr_reset_handler(struct ci_hdrc *ci) 745__releases(ci->lock) 746__acquires(ci->lock) 747{ 748 int retval; 749 750 spin_unlock(&ci->lock); 751 if (ci->gadget.speed != USB_SPEED_UNKNOWN) 752 usb_gadget_udc_reset(&ci->gadget, ci->driver); 753 754 retval = _gadget_stop_activity(&ci->gadget); 755 if (retval) 756 goto done; 757 758 retval = hw_usb_reset(ci); 759 if (retval) 760 goto done; 761 762 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC); 763 if (ci->status == NULL) 764 retval = -ENOMEM; 765 766done: 767 spin_lock(&ci->lock); 768 769 if (retval) 770 dev_err(ci->dev, "error: %i\n", retval); 771} 772 773/** 774 * isr_get_status_complete: get_status request complete function 775 * @ep: endpoint 776 * @req: request handled 777 * 778 * Caller must release lock 779 */ 780static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req) 781{ 782 if (ep == NULL || req == NULL) 783 return; 784 785 kfree(req->buf); 786 usb_ep_free_request(ep, req); 787} 788 789/** 790 * _ep_queue: queues (submits) an I/O request to an endpoint 791 * 792 * Caller must hold lock 793 */ 794static int _ep_queue(struct usb_ep *ep, struct usb_request *req, 795 gfp_t __maybe_unused gfp_flags) 796{ 797 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 798 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req); 799 struct ci_hdrc *ci = hwep->ci; 800 int retval = 0; 801 802 if (ep == NULL || req == NULL || hwep->ep.desc == NULL) 803 return -EINVAL; 804 805 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) { 806 if (req->length) 807 hwep = (ci->ep0_dir == RX) ? 808 ci->ep0out : ci->ep0in; 809 if (!list_empty(&hwep->qh.queue)) { 810 _ep_nuke(hwep); 811 retval = -EOVERFLOW; 812 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n", 813 _usb_addr(hwep)); 814 } 815 } 816 817 if (usb_endpoint_xfer_isoc(hwep->ep.desc) && 818 hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) { 819 dev_err(hwep->ci->dev, "request length too big for isochronous\n"); 820 return -EMSGSIZE; 821 } 822 823 /* first nuke then test link, e.g. previous status has not sent */ 824 if (!list_empty(&hwreq->queue)) { 825 dev_err(hwep->ci->dev, "request already in queue\n"); 826 return -EBUSY; 827 } 828 829 /* push request */ 830 hwreq->req.status = -EINPROGRESS; 831 hwreq->req.actual = 0; 832 833 retval = _hardware_enqueue(hwep, hwreq); 834 835 if (retval == -EALREADY) 836 retval = 0; 837 if (!retval) 838 list_add_tail(&hwreq->queue, &hwep->qh.queue); 839 840 return retval; 841} 842 843/** 844 * isr_get_status_response: get_status request response 845 * @ci: ci struct 846 * @setup: setup request packet 847 * 848 * This function returns an error code 849 */ 850static int isr_get_status_response(struct ci_hdrc *ci, 851 struct usb_ctrlrequest *setup) 852__releases(hwep->lock) 853__acquires(hwep->lock) 854{ 855 struct ci_hw_ep *hwep = ci->ep0in; 856 struct usb_request *req = NULL; 857 gfp_t gfp_flags = GFP_ATOMIC; 858 int dir, num, retval; 859 860 if (hwep == NULL || setup == NULL) 861 return -EINVAL; 862 863 spin_unlock(hwep->lock); 864 req = usb_ep_alloc_request(&hwep->ep, gfp_flags); 865 spin_lock(hwep->lock); 866 if (req == NULL) 867 return -ENOMEM; 868 869 req->complete = isr_get_status_complete; 870 req->length = 2; 871 req->buf = kzalloc(req->length, gfp_flags); 872 if (req->buf == NULL) { 873 retval = -ENOMEM; 874 goto err_free_req; 875 } 876 877 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) { 878 *(u16 *)req->buf = (ci->remote_wakeup << 1) | 879 ci->gadget.is_selfpowered; 880 } else if ((setup->bRequestType & USB_RECIP_MASK) \ 881 == USB_RECIP_ENDPOINT) { 882 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ? 883 TX : RX; 884 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK; 885 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir); 886 } 887 /* else do nothing; reserved for future use */ 888 889 retval = _ep_queue(&hwep->ep, req, gfp_flags); 890 if (retval) 891 goto err_free_buf; 892 893 return 0; 894 895 err_free_buf: 896 kfree(req->buf); 897 err_free_req: 898 spin_unlock(hwep->lock); 899 usb_ep_free_request(&hwep->ep, req); 900 spin_lock(hwep->lock); 901 return retval; 902} 903 904/** 905 * isr_setup_status_complete: setup_status request complete function 906 * @ep: endpoint 907 * @req: request handled 908 * 909 * Caller must release lock. Put the port in test mode if test mode 910 * feature is selected. 911 */ 912static void 913isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req) 914{ 915 struct ci_hdrc *ci = req->context; 916 unsigned long flags; 917 918 if (ci->setaddr) { 919 hw_usb_set_address(ci, ci->address); 920 ci->setaddr = false; 921 if (ci->address) 922 usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS); 923 } 924 925 spin_lock_irqsave(&ci->lock, flags); 926 if (ci->test_mode) 927 hw_port_test_set(ci, ci->test_mode); 928 spin_unlock_irqrestore(&ci->lock, flags); 929} 930 931/** 932 * isr_setup_status_phase: queues the status phase of a setup transation 933 * @ci: ci struct 934 * 935 * This function returns an error code 936 */ 937static int isr_setup_status_phase(struct ci_hdrc *ci) 938{ 939 int retval; 940 struct ci_hw_ep *hwep; 941 942 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in; 943 ci->status->context = ci; 944 ci->status->complete = isr_setup_status_complete; 945 946 retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC); 947 948 return retval; 949} 950 951/** 952 * isr_tr_complete_low: transaction complete low level handler 953 * @hwep: endpoint 954 * 955 * This function returns an error code 956 * Caller must hold lock 957 */ 958static int isr_tr_complete_low(struct ci_hw_ep *hwep) 959__releases(hwep->lock) 960__acquires(hwep->lock) 961{ 962 struct ci_hw_req *hwreq, *hwreqtemp; 963 struct ci_hw_ep *hweptemp = hwep; 964 int retval = 0; 965 966 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue, 967 queue) { 968 retval = _hardware_dequeue(hwep, hwreq); 969 if (retval < 0) 970 break; 971 list_del_init(&hwreq->queue); 972 if (hwreq->req.complete != NULL) { 973 spin_unlock(hwep->lock); 974 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) && 975 hwreq->req.length) 976 hweptemp = hwep->ci->ep0in; 977 usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req); 978 spin_lock(hwep->lock); 979 } 980 } 981 982 if (retval == -EBUSY) 983 retval = 0; 984 985 return retval; 986} 987 988static int otg_a_alt_hnp_support(struct ci_hdrc *ci) 989{ 990 dev_warn(&ci->gadget.dev, 991 "connect the device to an alternate port if you want HNP\n"); 992 return isr_setup_status_phase(ci); 993} 994 995/** 996 * isr_setup_packet_handler: setup packet handler 997 * @ci: UDC descriptor 998 * 999 * This function handles setup packet 1000 */ 1001static void isr_setup_packet_handler(struct ci_hdrc *ci) 1002__releases(ci->lock) 1003__acquires(ci->lock) 1004{ 1005 struct ci_hw_ep *hwep = &ci->ci_hw_ep[0]; 1006 struct usb_ctrlrequest req; 1007 int type, num, dir, err = -EINVAL; 1008 u8 tmode = 0; 1009 1010 /* 1011 * Flush data and handshake transactions of previous 1012 * setup packet. 1013 */ 1014 _ep_nuke(ci->ep0out); 1015 _ep_nuke(ci->ep0in); 1016 1017 /* read_setup_packet */ 1018 do { 1019 hw_test_and_set_setup_guard(ci); 1020 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req)); 1021 } while (!hw_test_and_clear_setup_guard(ci)); 1022 1023 type = req.bRequestType; 1024 1025 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX; 1026 1027 switch (req.bRequest) { 1028 case USB_REQ_CLEAR_FEATURE: 1029 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) && 1030 le16_to_cpu(req.wValue) == 1031 USB_ENDPOINT_HALT) { 1032 if (req.wLength != 0) 1033 break; 1034 num = le16_to_cpu(req.wIndex); 1035 dir = num & USB_ENDPOINT_DIR_MASK; 1036 num &= USB_ENDPOINT_NUMBER_MASK; 1037 if (dir) /* TX */ 1038 num += ci->hw_ep_max / 2; 1039 if (!ci->ci_hw_ep[num].wedge) { 1040 spin_unlock(&ci->lock); 1041 err = usb_ep_clear_halt( 1042 &ci->ci_hw_ep[num].ep); 1043 spin_lock(&ci->lock); 1044 if (err) 1045 break; 1046 } 1047 err = isr_setup_status_phase(ci); 1048 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) && 1049 le16_to_cpu(req.wValue) == 1050 USB_DEVICE_REMOTE_WAKEUP) { 1051 if (req.wLength != 0) 1052 break; 1053 ci->remote_wakeup = 0; 1054 err = isr_setup_status_phase(ci); 1055 } else { 1056 goto delegate; 1057 } 1058 break; 1059 case USB_REQ_GET_STATUS: 1060 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) && 1061 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) && 1062 type != (USB_DIR_IN|USB_RECIP_INTERFACE)) 1063 goto delegate; 1064 if (le16_to_cpu(req.wLength) != 2 || 1065 le16_to_cpu(req.wValue) != 0) 1066 break; 1067 err = isr_get_status_response(ci, &req); 1068 break; 1069 case USB_REQ_SET_ADDRESS: 1070 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE)) 1071 goto delegate; 1072 if (le16_to_cpu(req.wLength) != 0 || 1073 le16_to_cpu(req.wIndex) != 0) 1074 break; 1075 ci->address = (u8)le16_to_cpu(req.wValue); 1076 ci->setaddr = true; 1077 err = isr_setup_status_phase(ci); 1078 break; 1079 case USB_REQ_SET_FEATURE: 1080 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) && 1081 le16_to_cpu(req.wValue) == 1082 USB_ENDPOINT_HALT) { 1083 if (req.wLength != 0) 1084 break; 1085 num = le16_to_cpu(req.wIndex); 1086 dir = num & USB_ENDPOINT_DIR_MASK; 1087 num &= USB_ENDPOINT_NUMBER_MASK; 1088 if (dir) /* TX */ 1089 num += ci->hw_ep_max / 2; 1090 1091 spin_unlock(&ci->lock); 1092 err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false); 1093 spin_lock(&ci->lock); 1094 if (!err) 1095 isr_setup_status_phase(ci); 1096 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) { 1097 if (req.wLength != 0) 1098 break; 1099 switch (le16_to_cpu(req.wValue)) { 1100 case USB_DEVICE_REMOTE_WAKEUP: 1101 ci->remote_wakeup = 1; 1102 err = isr_setup_status_phase(ci); 1103 break; 1104 case USB_DEVICE_TEST_MODE: 1105 tmode = le16_to_cpu(req.wIndex) >> 8; 1106 switch (tmode) { 1107 case TEST_J: 1108 case TEST_K: 1109 case TEST_SE0_NAK: 1110 case TEST_PACKET: 1111 case TEST_FORCE_EN: 1112 ci->test_mode = tmode; 1113 err = isr_setup_status_phase( 1114 ci); 1115 break; 1116 default: 1117 break; 1118 } 1119 break; 1120 case USB_DEVICE_B_HNP_ENABLE: 1121 if (ci_otg_is_fsm_mode(ci)) { 1122 ci->gadget.b_hnp_enable = 1; 1123 err = isr_setup_status_phase( 1124 ci); 1125 } 1126 break; 1127 case USB_DEVICE_A_ALT_HNP_SUPPORT: 1128 if (ci_otg_is_fsm_mode(ci)) 1129 err = otg_a_alt_hnp_support(ci); 1130 break; 1131 default: 1132 goto delegate; 1133 } 1134 } else { 1135 goto delegate; 1136 } 1137 break; 1138 default: 1139delegate: 1140 if (req.wLength == 0) /* no data phase */ 1141 ci->ep0_dir = TX; 1142 1143 spin_unlock(&ci->lock); 1144 err = ci->driver->setup(&ci->gadget, &req); 1145 spin_lock(&ci->lock); 1146 break; 1147 } 1148 1149 if (err < 0) { 1150 spin_unlock(&ci->lock); 1151 if (_ep_set_halt(&hwep->ep, 1, false)) 1152 dev_err(ci->dev, "error: _ep_set_halt\n"); 1153 spin_lock(&ci->lock); 1154 } 1155} 1156 1157/** 1158 * isr_tr_complete_handler: transaction complete interrupt handler 1159 * @ci: UDC descriptor 1160 * 1161 * This function handles traffic events 1162 */ 1163static void isr_tr_complete_handler(struct ci_hdrc *ci) 1164__releases(ci->lock) 1165__acquires(ci->lock) 1166{ 1167 unsigned i; 1168 int err; 1169 1170 for (i = 0; i < ci->hw_ep_max; i++) { 1171 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i]; 1172 1173 if (hwep->ep.desc == NULL) 1174 continue; /* not configured */ 1175 1176 if (hw_test_and_clear_complete(ci, i)) { 1177 err = isr_tr_complete_low(hwep); 1178 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) { 1179 if (err > 0) /* needs status phase */ 1180 err = isr_setup_status_phase(ci); 1181 if (err < 0) { 1182 spin_unlock(&ci->lock); 1183 if (_ep_set_halt(&hwep->ep, 1, false)) 1184 dev_err(ci->dev, 1185 "error: _ep_set_halt\n"); 1186 spin_lock(&ci->lock); 1187 } 1188 } 1189 } 1190 1191 /* Only handle setup packet below */ 1192 if (i == 0 && 1193 hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0))) 1194 isr_setup_packet_handler(ci); 1195 } 1196} 1197 1198/****************************************************************************** 1199 * ENDPT block 1200 *****************************************************************************/ 1201/** 1202 * ep_enable: configure endpoint, making it usable 1203 * 1204 * Check usb_ep_enable() at "usb_gadget.h" for details 1205 */ 1206static int ep_enable(struct usb_ep *ep, 1207 const struct usb_endpoint_descriptor *desc) 1208{ 1209 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1210 int retval = 0; 1211 unsigned long flags; 1212 u32 cap = 0; 1213 1214 if (ep == NULL || desc == NULL) 1215 return -EINVAL; 1216 1217 spin_lock_irqsave(hwep->lock, flags); 1218 1219 /* only internal SW should enable ctrl endpts */ 1220 1221 if (!list_empty(&hwep->qh.queue)) { 1222 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n"); 1223 spin_unlock_irqrestore(hwep->lock, flags); 1224 return -EBUSY; 1225 } 1226 1227 hwep->ep.desc = desc; 1228 1229 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX; 1230 hwep->num = usb_endpoint_num(desc); 1231 hwep->type = usb_endpoint_type(desc); 1232 1233 hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff; 1234 hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc)); 1235 1236 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) 1237 cap |= QH_IOS; 1238 1239 cap |= QH_ZLT; 1240 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT; 1241 /* 1242 * For ISO-TX, we set mult at QH as the largest value, and use 1243 * MultO at TD as real mult value. 1244 */ 1245 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) 1246 cap |= 3 << __ffs(QH_MULT); 1247 1248 hwep->qh.ptr->cap = cpu_to_le32(cap); 1249 1250 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */ 1251 1252 if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) { 1253 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n"); 1254 retval = -EINVAL; 1255 } 1256 1257 /* 1258 * Enable endpoints in the HW other than ep0 as ep0 1259 * is always enabled 1260 */ 1261 if (hwep->num) 1262 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir, 1263 hwep->type); 1264 1265 spin_unlock_irqrestore(hwep->lock, flags); 1266 return retval; 1267} 1268 1269/** 1270 * ep_disable: endpoint is no longer usable 1271 * 1272 * Check usb_ep_disable() at "usb_gadget.h" for details 1273 */ 1274static int ep_disable(struct usb_ep *ep) 1275{ 1276 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1277 int direction, retval = 0; 1278 unsigned long flags; 1279 1280 if (ep == NULL) 1281 return -EINVAL; 1282 else if (hwep->ep.desc == NULL) 1283 return -EBUSY; 1284 1285 spin_lock_irqsave(hwep->lock, flags); 1286 1287 /* only internal SW should disable ctrl endpts */ 1288 1289 direction = hwep->dir; 1290 do { 1291 retval |= _ep_nuke(hwep); 1292 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir); 1293 1294 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) 1295 hwep->dir = (hwep->dir == TX) ? RX : TX; 1296 1297 } while (hwep->dir != direction); 1298 1299 hwep->ep.desc = NULL; 1300 1301 spin_unlock_irqrestore(hwep->lock, flags); 1302 return retval; 1303} 1304 1305/** 1306 * ep_alloc_request: allocate a request object to use with this endpoint 1307 * 1308 * Check usb_ep_alloc_request() at "usb_gadget.h" for details 1309 */ 1310static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags) 1311{ 1312 struct ci_hw_req *hwreq = NULL; 1313 1314 if (ep == NULL) 1315 return NULL; 1316 1317 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags); 1318 if (hwreq != NULL) { 1319 INIT_LIST_HEAD(&hwreq->queue); 1320 INIT_LIST_HEAD(&hwreq->tds); 1321 } 1322 1323 return (hwreq == NULL) ? NULL : &hwreq->req; 1324} 1325 1326/** 1327 * ep_free_request: frees a request object 1328 * 1329 * Check usb_ep_free_request() at "usb_gadget.h" for details 1330 */ 1331static void ep_free_request(struct usb_ep *ep, struct usb_request *req) 1332{ 1333 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1334 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req); 1335 struct td_node *node, *tmpnode; 1336 unsigned long flags; 1337 1338 if (ep == NULL || req == NULL) { 1339 return; 1340 } else if (!list_empty(&hwreq->queue)) { 1341 dev_err(hwep->ci->dev, "freeing queued request\n"); 1342 return; 1343 } 1344 1345 spin_lock_irqsave(hwep->lock, flags); 1346 1347 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) { 1348 dma_pool_free(hwep->td_pool, node->ptr, node->dma); 1349 list_del_init(&node->td); 1350 node->ptr = NULL; 1351 kfree(node); 1352 } 1353 1354 kfree(hwreq); 1355 1356 spin_unlock_irqrestore(hwep->lock, flags); 1357} 1358 1359/** 1360 * ep_queue: queues (submits) an I/O request to an endpoint 1361 * 1362 * Check usb_ep_queue()* at usb_gadget.h" for details 1363 */ 1364static int ep_queue(struct usb_ep *ep, struct usb_request *req, 1365 gfp_t __maybe_unused gfp_flags) 1366{ 1367 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1368 int retval = 0; 1369 unsigned long flags; 1370 1371 if (ep == NULL || req == NULL || hwep->ep.desc == NULL) 1372 return -EINVAL; 1373 1374 spin_lock_irqsave(hwep->lock, flags); 1375 retval = _ep_queue(ep, req, gfp_flags); 1376 spin_unlock_irqrestore(hwep->lock, flags); 1377 return retval; 1378} 1379 1380/** 1381 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint 1382 * 1383 * Check usb_ep_dequeue() at "usb_gadget.h" for details 1384 */ 1385static int ep_dequeue(struct usb_ep *ep, struct usb_request *req) 1386{ 1387 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1388 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req); 1389 unsigned long flags; 1390 struct td_node *node, *tmpnode; 1391 1392 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY || 1393 hwep->ep.desc == NULL || list_empty(&hwreq->queue) || 1394 list_empty(&hwep->qh.queue)) 1395 return -EINVAL; 1396 1397 spin_lock_irqsave(hwep->lock, flags); 1398 1399 hw_ep_flush(hwep->ci, hwep->num, hwep->dir); 1400 1401 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) { 1402 dma_pool_free(hwep->td_pool, node->ptr, node->dma); 1403 list_del(&node->td); 1404 kfree(node); 1405 } 1406 1407 /* pop request */ 1408 list_del_init(&hwreq->queue); 1409 1410 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir); 1411 1412 req->status = -ECONNRESET; 1413 1414 if (hwreq->req.complete != NULL) { 1415 spin_unlock(hwep->lock); 1416 usb_gadget_giveback_request(&hwep->ep, &hwreq->req); 1417 spin_lock(hwep->lock); 1418 } 1419 1420 spin_unlock_irqrestore(hwep->lock, flags); 1421 return 0; 1422} 1423 1424/** 1425 * ep_set_halt: sets the endpoint halt feature 1426 * 1427 * Check usb_ep_set_halt() at "usb_gadget.h" for details 1428 */ 1429static int ep_set_halt(struct usb_ep *ep, int value) 1430{ 1431 return _ep_set_halt(ep, value, true); 1432} 1433 1434/** 1435 * ep_set_wedge: sets the halt feature and ignores clear requests 1436 * 1437 * Check usb_ep_set_wedge() at "usb_gadget.h" for details 1438 */ 1439static int ep_set_wedge(struct usb_ep *ep) 1440{ 1441 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1442 unsigned long flags; 1443 1444 if (ep == NULL || hwep->ep.desc == NULL) 1445 return -EINVAL; 1446 1447 spin_lock_irqsave(hwep->lock, flags); 1448 hwep->wedge = 1; 1449 spin_unlock_irqrestore(hwep->lock, flags); 1450 1451 return usb_ep_set_halt(ep); 1452} 1453 1454/** 1455 * ep_fifo_flush: flushes contents of a fifo 1456 * 1457 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details 1458 */ 1459static void ep_fifo_flush(struct usb_ep *ep) 1460{ 1461 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1462 unsigned long flags; 1463 1464 if (ep == NULL) { 1465 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep)); 1466 return; 1467 } 1468 1469 spin_lock_irqsave(hwep->lock, flags); 1470 1471 hw_ep_flush(hwep->ci, hwep->num, hwep->dir); 1472 1473 spin_unlock_irqrestore(hwep->lock, flags); 1474} 1475 1476/** 1477 * Endpoint-specific part of the API to the USB controller hardware 1478 * Check "usb_gadget.h" for details 1479 */ 1480static const struct usb_ep_ops usb_ep_ops = { 1481 .enable = ep_enable, 1482 .disable = ep_disable, 1483 .alloc_request = ep_alloc_request, 1484 .free_request = ep_free_request, 1485 .queue = ep_queue, 1486 .dequeue = ep_dequeue, 1487 .set_halt = ep_set_halt, 1488 .set_wedge = ep_set_wedge, 1489 .fifo_flush = ep_fifo_flush, 1490}; 1491 1492/****************************************************************************** 1493 * GADGET block 1494 *****************************************************************************/ 1495static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active) 1496{ 1497 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1498 unsigned long flags; 1499 int gadget_ready = 0; 1500 1501 spin_lock_irqsave(&ci->lock, flags); 1502 ci->vbus_active = is_active; 1503 if (ci->driver) 1504 gadget_ready = 1; 1505 spin_unlock_irqrestore(&ci->lock, flags); 1506 1507 if (gadget_ready) { 1508 if (is_active) { 1509 pm_runtime_get_sync(&_gadget->dev); 1510 hw_device_reset(ci); 1511 hw_device_state(ci, ci->ep0out->qh.dma); 1512 usb_gadget_set_state(_gadget, USB_STATE_POWERED); 1513 usb_udc_vbus_handler(_gadget, true); 1514 } else { 1515 usb_udc_vbus_handler(_gadget, false); 1516 if (ci->driver) 1517 ci->driver->disconnect(&ci->gadget); 1518 hw_device_state(ci, 0); 1519 if (ci->platdata->notify_event) 1520 ci->platdata->notify_event(ci, 1521 CI_HDRC_CONTROLLER_STOPPED_EVENT); 1522 _gadget_stop_activity(&ci->gadget); 1523 pm_runtime_put_sync(&_gadget->dev); 1524 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED); 1525 } 1526 } 1527 1528 return 0; 1529} 1530 1531static int ci_udc_wakeup(struct usb_gadget *_gadget) 1532{ 1533 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1534 unsigned long flags; 1535 int ret = 0; 1536 1537 spin_lock_irqsave(&ci->lock, flags); 1538 if (!ci->remote_wakeup) { 1539 ret = -EOPNOTSUPP; 1540 goto out; 1541 } 1542 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) { 1543 ret = -EINVAL; 1544 goto out; 1545 } 1546 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR); 1547out: 1548 spin_unlock_irqrestore(&ci->lock, flags); 1549 return ret; 1550} 1551 1552static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma) 1553{ 1554 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1555 1556 if (ci->usb_phy) 1557 return usb_phy_set_power(ci->usb_phy, ma); 1558 return -ENOTSUPP; 1559} 1560 1561static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on) 1562{ 1563 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1564 struct ci_hw_ep *hwep = ci->ep0in; 1565 unsigned long flags; 1566 1567 spin_lock_irqsave(hwep->lock, flags); 1568 _gadget->is_selfpowered = (is_on != 0); 1569 spin_unlock_irqrestore(hwep->lock, flags); 1570 1571 return 0; 1572} 1573 1574/* Change Data+ pullup status 1575 * this func is used by usb_gadget_connect/disconnet 1576 */ 1577static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on) 1578{ 1579 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1580 1581 /* Data+ pullup controlled by OTG state machine in OTG fsm mode */ 1582 if (ci_otg_is_fsm_mode(ci)) 1583 return 0; 1584 1585 pm_runtime_get_sync(&ci->gadget.dev); 1586 if (is_on) 1587 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS); 1588 else 1589 hw_write(ci, OP_USBCMD, USBCMD_RS, 0); 1590 pm_runtime_put_sync(&ci->gadget.dev); 1591 1592 return 0; 1593} 1594 1595static int ci_udc_start(struct usb_gadget *gadget, 1596 struct usb_gadget_driver *driver); 1597static int ci_udc_stop(struct usb_gadget *gadget); 1598/** 1599 * Device operations part of the API to the USB controller hardware, 1600 * which don't involve endpoints (or i/o) 1601 * Check "usb_gadget.h" for details 1602 */ 1603static const struct usb_gadget_ops usb_gadget_ops = { 1604 .vbus_session = ci_udc_vbus_session, 1605 .wakeup = ci_udc_wakeup, 1606 .set_selfpowered = ci_udc_selfpowered, 1607 .pullup = ci_udc_pullup, 1608 .vbus_draw = ci_udc_vbus_draw, 1609 .udc_start = ci_udc_start, 1610 .udc_stop = ci_udc_stop, 1611}; 1612 1613static int init_eps(struct ci_hdrc *ci) 1614{ 1615 int retval = 0, i, j; 1616 1617 for (i = 0; i < ci->hw_ep_max/2; i++) 1618 for (j = RX; j <= TX; j++) { 1619 int k = i + j * ci->hw_ep_max/2; 1620 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k]; 1621 1622 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i, 1623 (j == TX) ? "in" : "out"); 1624 1625 hwep->ci = ci; 1626 hwep->lock = &ci->lock; 1627 hwep->td_pool = ci->td_pool; 1628 1629 hwep->ep.name = hwep->name; 1630 hwep->ep.ops = &usb_ep_ops; 1631 /* 1632 * for ep0: maxP defined in desc, for other 1633 * eps, maxP is set by epautoconfig() called 1634 * by gadget layer 1635 */ 1636 usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0); 1637 1638 INIT_LIST_HEAD(&hwep->qh.queue); 1639 hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL, 1640 &hwep->qh.dma); 1641 if (hwep->qh.ptr == NULL) 1642 retval = -ENOMEM; 1643 else 1644 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr)); 1645 1646 /* 1647 * set up shorthands for ep0 out and in endpoints, 1648 * don't add to gadget's ep_list 1649 */ 1650 if (i == 0) { 1651 if (j == RX) 1652 ci->ep0out = hwep; 1653 else 1654 ci->ep0in = hwep; 1655 1656 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX); 1657 continue; 1658 } 1659 1660 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list); 1661 } 1662 1663 return retval; 1664} 1665 1666static void destroy_eps(struct ci_hdrc *ci) 1667{ 1668 int i; 1669 1670 for (i = 0; i < ci->hw_ep_max; i++) { 1671 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i]; 1672 1673 if (hwep->pending_td) 1674 free_pending_td(hwep); 1675 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma); 1676 } 1677} 1678 1679/** 1680 * ci_udc_start: register a gadget driver 1681 * @gadget: our gadget 1682 * @driver: the driver being registered 1683 * 1684 * Interrupts are enabled here. 1685 */ 1686static int ci_udc_start(struct usb_gadget *gadget, 1687 struct usb_gadget_driver *driver) 1688{ 1689 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget); 1690 unsigned long flags; 1691 int retval = -ENOMEM; 1692 1693 if (driver->disconnect == NULL) 1694 return -EINVAL; 1695 1696 1697 ci->ep0out->ep.desc = &ctrl_endpt_out_desc; 1698 retval = usb_ep_enable(&ci->ep0out->ep); 1699 if (retval) 1700 return retval; 1701 1702 ci->ep0in->ep.desc = &ctrl_endpt_in_desc; 1703 retval = usb_ep_enable(&ci->ep0in->ep); 1704 if (retval) 1705 return retval; 1706 1707 ci->driver = driver; 1708 1709 /* Start otg fsm for B-device */ 1710 if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) { 1711 ci_hdrc_otg_fsm_start(ci); 1712 return retval; 1713 } 1714 1715 pm_runtime_get_sync(&ci->gadget.dev); 1716 if (ci->vbus_active) { 1717 spin_lock_irqsave(&ci->lock, flags); 1718 hw_device_reset(ci); 1719 } else { 1720 usb_udc_vbus_handler(&ci->gadget, false); 1721 pm_runtime_put_sync(&ci->gadget.dev); 1722 return retval; 1723 } 1724 1725 retval = hw_device_state(ci, ci->ep0out->qh.dma); 1726 spin_unlock_irqrestore(&ci->lock, flags); 1727 if (retval) 1728 pm_runtime_put_sync(&ci->gadget.dev); 1729 1730 return retval; 1731} 1732 1733static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci) 1734{ 1735 if (!ci_otg_is_fsm_mode(ci)) 1736 return; 1737 1738 mutex_lock(&ci->fsm.lock); 1739 if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) { 1740 ci->fsm.a_bidl_adis_tmout = 1; 1741 ci_hdrc_otg_fsm_start(ci); 1742 } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) { 1743 ci->fsm.protocol = PROTO_UNDEF; 1744 ci->fsm.otg->state = OTG_STATE_UNDEFINED; 1745 } 1746 mutex_unlock(&ci->fsm.lock); 1747} 1748 1749/** 1750 * ci_udc_stop: unregister a gadget driver 1751 */ 1752static int ci_udc_stop(struct usb_gadget *gadget) 1753{ 1754 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget); 1755 unsigned long flags; 1756 1757 spin_lock_irqsave(&ci->lock, flags); 1758 1759 if (ci->vbus_active) { 1760 hw_device_state(ci, 0); 1761 if (ci->platdata->notify_event) 1762 ci->platdata->notify_event(ci, 1763 CI_HDRC_CONTROLLER_STOPPED_EVENT); 1764 spin_unlock_irqrestore(&ci->lock, flags); 1765 _gadget_stop_activity(&ci->gadget); 1766 spin_lock_irqsave(&ci->lock, flags); 1767 pm_runtime_put(&ci->gadget.dev); 1768 } 1769 1770 ci->driver = NULL; 1771 spin_unlock_irqrestore(&ci->lock, flags); 1772 1773 ci_udc_stop_for_otg_fsm(ci); 1774 return 0; 1775} 1776 1777/****************************************************************************** 1778 * BUS block 1779 *****************************************************************************/ 1780/** 1781 * udc_irq: ci interrupt handler 1782 * 1783 * This function returns IRQ_HANDLED if the IRQ has been handled 1784 * It locks access to registers 1785 */ 1786static irqreturn_t udc_irq(struct ci_hdrc *ci) 1787{ 1788 irqreturn_t retval; 1789 u32 intr; 1790 1791 if (ci == NULL) 1792 return IRQ_HANDLED; 1793 1794 spin_lock(&ci->lock); 1795 1796 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) { 1797 if (hw_read(ci, OP_USBMODE, USBMODE_CM) != 1798 USBMODE_CM_DC) { 1799 spin_unlock(&ci->lock); 1800 return IRQ_NONE; 1801 } 1802 } 1803 intr = hw_test_and_clear_intr_active(ci); 1804 1805 if (intr) { 1806 /* order defines priority - do NOT change it */ 1807 if (USBi_URI & intr) 1808 isr_reset_handler(ci); 1809 1810 if (USBi_PCI & intr) { 1811 ci->gadget.speed = hw_port_is_high_speed(ci) ? 1812 USB_SPEED_HIGH : USB_SPEED_FULL; 1813 if (ci->suspended && ci->driver->resume) { 1814 spin_unlock(&ci->lock); 1815 ci->driver->resume(&ci->gadget); 1816 spin_lock(&ci->lock); 1817 ci->suspended = 0; 1818 } 1819 } 1820 1821 if (USBi_UI & intr) 1822 isr_tr_complete_handler(ci); 1823 1824 if (USBi_SLI & intr) { 1825 if (ci->gadget.speed != USB_SPEED_UNKNOWN && 1826 ci->driver->suspend) { 1827 ci->suspended = 1; 1828 spin_unlock(&ci->lock); 1829 ci->driver->suspend(&ci->gadget); 1830 usb_gadget_set_state(&ci->gadget, 1831 USB_STATE_SUSPENDED); 1832 spin_lock(&ci->lock); 1833 } 1834 } 1835 retval = IRQ_HANDLED; 1836 } else { 1837 retval = IRQ_NONE; 1838 } 1839 spin_unlock(&ci->lock); 1840 1841 return retval; 1842} 1843 1844/** 1845 * udc_start: initialize gadget role 1846 * @ci: chipidea controller 1847 */ 1848static int udc_start(struct ci_hdrc *ci) 1849{ 1850 struct device *dev = ci->dev; 1851 int retval = 0; 1852 1853 spin_lock_init(&ci->lock); 1854 1855 ci->gadget.ops = &usb_gadget_ops; 1856 ci->gadget.speed = USB_SPEED_UNKNOWN; 1857 ci->gadget.max_speed = USB_SPEED_HIGH; 1858 ci->gadget.is_otg = ci->is_otg ? 1 : 0; 1859 ci->gadget.name = ci->platdata->name; 1860 1861 INIT_LIST_HEAD(&ci->gadget.ep_list); 1862 1863 /* alloc resources */ 1864 ci->qh_pool = dma_pool_create("ci_hw_qh", dev, 1865 sizeof(struct ci_hw_qh), 1866 64, CI_HDRC_PAGE_SIZE); 1867 if (ci->qh_pool == NULL) 1868 return -ENOMEM; 1869 1870 ci->td_pool = dma_pool_create("ci_hw_td", dev, 1871 sizeof(struct ci_hw_td), 1872 64, CI_HDRC_PAGE_SIZE); 1873 if (ci->td_pool == NULL) { 1874 retval = -ENOMEM; 1875 goto free_qh_pool; 1876 } 1877 1878 retval = init_eps(ci); 1879 if (retval) 1880 goto free_pools; 1881 1882 ci->gadget.ep0 = &ci->ep0in->ep; 1883 1884 retval = usb_add_gadget_udc(dev, &ci->gadget); 1885 if (retval) 1886 goto destroy_eps; 1887 1888 pm_runtime_no_callbacks(&ci->gadget.dev); 1889 pm_runtime_enable(&ci->gadget.dev); 1890 1891 return retval; 1892 1893destroy_eps: 1894 destroy_eps(ci); 1895free_pools: 1896 dma_pool_destroy(ci->td_pool); 1897free_qh_pool: 1898 dma_pool_destroy(ci->qh_pool); 1899 return retval; 1900} 1901 1902/** 1903 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC 1904 * 1905 * No interrupts active, the IRQ has been released 1906 */ 1907void ci_hdrc_gadget_destroy(struct ci_hdrc *ci) 1908{ 1909 if (!ci->roles[CI_ROLE_GADGET]) 1910 return; 1911 1912 usb_del_gadget_udc(&ci->gadget); 1913 1914 destroy_eps(ci); 1915 1916 dma_pool_destroy(ci->td_pool); 1917 dma_pool_destroy(ci->qh_pool); 1918} 1919 1920static int udc_id_switch_for_device(struct ci_hdrc *ci) 1921{ 1922 if (ci->is_otg) 1923 /* Clear and enable BSV irq */ 1924 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE, 1925 OTGSC_BSVIS | OTGSC_BSVIE); 1926 1927 return 0; 1928} 1929 1930static void udc_id_switch_for_host(struct ci_hdrc *ci) 1931{ 1932 /* 1933 * host doesn't care B_SESSION_VALID event 1934 * so clear and disbale BSV irq 1935 */ 1936 if (ci->is_otg) 1937 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS); 1938} 1939 1940/** 1941 * ci_hdrc_gadget_init - initialize device related bits 1942 * ci: the controller 1943 * 1944 * This function initializes the gadget, if the device is "device capable". 1945 */ 1946int ci_hdrc_gadget_init(struct ci_hdrc *ci) 1947{ 1948 struct ci_role_driver *rdrv; 1949 1950 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC)) 1951 return -ENXIO; 1952 1953 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL); 1954 if (!rdrv) 1955 return -ENOMEM; 1956 1957 rdrv->start = udc_id_switch_for_device; 1958 rdrv->stop = udc_id_switch_for_host; 1959 rdrv->irq = udc_irq; 1960 rdrv->name = "gadget"; 1961 ci->roles[CI_ROLE_GADGET] = rdrv; 1962 1963 return udc_start(ci); 1964} 1965