1// SPDX-License-Identifier: GPL-2.0 2/* 3 * udc.c - ChipIdea UDC driver 4 * 5 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved. 6 * 7 * Author: David Lopo 8 */ 9 10#include <linux/delay.h> 11#include <linux/device.h> 12#include <linux/dmapool.h> 13#include <linux/err.h> 14#include <linux/irqreturn.h> 15#include <linux/kernel.h> 16#include <linux/slab.h> 17#include <linux/pm_runtime.h> 18#include <linux/pinctrl/consumer.h> 19#include <linux/usb/ch9.h> 20#include <linux/usb/gadget.h> 21#include <linux/usb/otg-fsm.h> 22#include <linux/usb/chipidea.h> 23 24#include "ci.h" 25#include "udc.h" 26#include "bits.h" 27#include "otg.h" 28#include "otg_fsm.h" 29#include "trace.h" 30 31/* control endpoint description */ 32static const struct usb_endpoint_descriptor 33ctrl_endpt_out_desc = { 34 .bLength = USB_DT_ENDPOINT_SIZE, 35 .bDescriptorType = USB_DT_ENDPOINT, 36 37 .bEndpointAddress = USB_DIR_OUT, 38 .bmAttributes = USB_ENDPOINT_XFER_CONTROL, 39 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX), 40}; 41 42static const struct usb_endpoint_descriptor 43ctrl_endpt_in_desc = { 44 .bLength = USB_DT_ENDPOINT_SIZE, 45 .bDescriptorType = USB_DT_ENDPOINT, 46 47 .bEndpointAddress = USB_DIR_IN, 48 .bmAttributes = USB_ENDPOINT_XFER_CONTROL, 49 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX), 50}; 51 52static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep, 53 struct td_node *node); 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 == TX) ? 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 * @ci: the controller 79 * @dma: 0 => disable, !0 => enable and set dma engine 80 * 81 * This function returns an error code 82 */ 83static int hw_device_state(struct ci_hdrc *ci, u32 dma) 84{ 85 if (dma) { 86 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma); 87 /* interrupt, error, port change, reset, sleep/suspend */ 88 hw_write(ci, OP_USBINTR, ~0, 89 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI); 90 } else { 91 hw_write(ci, OP_USBINTR, ~0, 0); 92 } 93 return 0; 94} 95 96/** 97 * hw_ep_flush: flush endpoint fifo (execute without interruption) 98 * @ci: the controller 99 * @num: endpoint number 100 * @dir: endpoint direction 101 * 102 * This function returns an error code 103 */ 104static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir) 105{ 106 int n = hw_ep_bit(num, dir); 107 108 do { 109 /* flush any pending transfer */ 110 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n)); 111 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n))) 112 cpu_relax(); 113 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n))); 114 115 return 0; 116} 117 118/** 119 * hw_ep_disable: disables endpoint (execute without interruption) 120 * @ci: the controller 121 * @num: endpoint number 122 * @dir: endpoint direction 123 * 124 * This function returns an error code 125 */ 126static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir) 127{ 128 hw_write(ci, OP_ENDPTCTRL + num, 129 (dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0); 130 return 0; 131} 132 133/** 134 * hw_ep_enable: enables endpoint (execute without interruption) 135 * @ci: the controller 136 * @num: endpoint number 137 * @dir: endpoint direction 138 * @type: endpoint type 139 * 140 * This function returns an error code 141 */ 142static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type) 143{ 144 u32 mask, data; 145 146 if (dir == TX) { 147 mask = ENDPTCTRL_TXT; /* type */ 148 data = type << __ffs(mask); 149 150 mask |= ENDPTCTRL_TXS; /* unstall */ 151 mask |= ENDPTCTRL_TXR; /* reset data toggle */ 152 data |= ENDPTCTRL_TXR; 153 mask |= ENDPTCTRL_TXE; /* enable */ 154 data |= ENDPTCTRL_TXE; 155 } else { 156 mask = ENDPTCTRL_RXT; /* type */ 157 data = type << __ffs(mask); 158 159 mask |= ENDPTCTRL_RXS; /* unstall */ 160 mask |= ENDPTCTRL_RXR; /* reset data toggle */ 161 data |= ENDPTCTRL_RXR; 162 mask |= ENDPTCTRL_RXE; /* enable */ 163 data |= ENDPTCTRL_RXE; 164 } 165 hw_write(ci, OP_ENDPTCTRL + num, mask, data); 166 return 0; 167} 168 169/** 170 * hw_ep_get_halt: return endpoint halt status 171 * @ci: the controller 172 * @num: endpoint number 173 * @dir: endpoint direction 174 * 175 * This function returns 1 if endpoint halted 176 */ 177static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir) 178{ 179 u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS; 180 181 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0; 182} 183 184/** 185 * hw_ep_prime: primes endpoint (execute without interruption) 186 * @ci: the controller 187 * @num: endpoint number 188 * @dir: endpoint direction 189 * @is_ctrl: true if control endpoint 190 * 191 * This function returns an error code 192 */ 193static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl) 194{ 195 int n = hw_ep_bit(num, dir); 196 197 /* Synchronize before ep prime */ 198 wmb(); 199 200 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num))) 201 return -EAGAIN; 202 203 hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n)); 204 205 while (hw_read(ci, OP_ENDPTPRIME, BIT(n))) 206 cpu_relax(); 207 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num))) 208 return -EAGAIN; 209 210 /* status shoult be tested according with manual but it doesn't work */ 211 return 0; 212} 213 214/** 215 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute 216 * without interruption) 217 * @ci: the controller 218 * @num: endpoint number 219 * @dir: endpoint direction 220 * @value: true => stall, false => unstall 221 * 222 * This function returns an error code 223 */ 224static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value) 225{ 226 if (value != 0 && value != 1) 227 return -EINVAL; 228 229 do { 230 enum ci_hw_regs reg = OP_ENDPTCTRL + num; 231 u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS; 232 u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR; 233 234 /* data toggle - reserved for EP0 but it's in ESS */ 235 hw_write(ci, reg, mask_xs|mask_xr, 236 value ? mask_xs : mask_xr); 237 } while (value != hw_ep_get_halt(ci, num, dir)); 238 239 return 0; 240} 241 242/** 243 * hw_port_is_high_speed: test if port is high speed 244 * @ci: the controller 245 * 246 * This function returns true if high speed port 247 */ 248static int hw_port_is_high_speed(struct ci_hdrc *ci) 249{ 250 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) : 251 hw_read(ci, OP_PORTSC, PORTSC_HSP); 252} 253 254/** 255 * hw_test_and_clear_complete: test & clear complete status (execute without 256 * interruption) 257 * @ci: the controller 258 * @n: endpoint number 259 * 260 * This function returns complete status 261 */ 262static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n) 263{ 264 n = ep_to_bit(ci, n); 265 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n)); 266} 267 268/** 269 * hw_test_and_clear_intr_active: test & clear active interrupts (execute 270 * without interruption) 271 * @ci: the controller 272 * 273 * This function returns active interrutps 274 */ 275static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci) 276{ 277 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci); 278 279 hw_write(ci, OP_USBSTS, ~0, reg); 280 return reg; 281} 282 283/** 284 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without 285 * interruption) 286 * @ci: the controller 287 * 288 * This function returns guard value 289 */ 290static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci) 291{ 292 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0); 293} 294 295/** 296 * hw_test_and_set_setup_guard: test & set setup guard (execute without 297 * interruption) 298 * @ci: the controller 299 * 300 * This function returns guard value 301 */ 302static int hw_test_and_set_setup_guard(struct ci_hdrc *ci) 303{ 304 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW); 305} 306 307/** 308 * hw_usb_set_address: configures USB address (execute without interruption) 309 * @ci: the controller 310 * @value: new USB address 311 * 312 * This function explicitly sets the address, without the "USBADRA" (advance) 313 * feature, which is not supported by older versions of the controller. 314 */ 315static void hw_usb_set_address(struct ci_hdrc *ci, u8 value) 316{ 317 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR, 318 value << __ffs(DEVICEADDR_USBADR)); 319} 320 321/** 322 * hw_usb_reset: restart device after a bus reset (execute without 323 * interruption) 324 * @ci: the controller 325 * 326 * This function returns an error code 327 */ 328static int hw_usb_reset(struct ci_hdrc *ci) 329{ 330 hw_usb_set_address(ci, 0); 331 332 /* ESS flushes only at end?!? */ 333 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0); 334 335 /* clear setup token semaphores */ 336 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0); 337 338 /* clear complete status */ 339 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0); 340 341 /* wait until all bits cleared */ 342 while (hw_read(ci, OP_ENDPTPRIME, ~0)) 343 udelay(10); /* not RTOS friendly */ 344 345 /* reset all endpoints ? */ 346 347 /* reset internal status and wait for further instructions 348 no need to verify the port reset status (ESS does it) */ 349 350 return 0; 351} 352 353/****************************************************************************** 354 * UTIL block 355 *****************************************************************************/ 356 357static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq, 358 unsigned int length, struct scatterlist *s) 359{ 360 int i; 361 u32 temp; 362 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node), 363 GFP_ATOMIC); 364 365 if (node == NULL) 366 return -ENOMEM; 367 368 node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma); 369 if (node->ptr == NULL) { 370 kfree(node); 371 return -ENOMEM; 372 } 373 374 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES)); 375 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES); 376 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE); 377 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) { 378 u32 mul = hwreq->req.length / hwep->ep.maxpacket; 379 380 if (hwreq->req.length == 0 381 || hwreq->req.length % hwep->ep.maxpacket) 382 mul++; 383 node->ptr->token |= cpu_to_le32(mul << __ffs(TD_MULTO)); 384 } 385 386 if (s) { 387 temp = (u32) (sg_dma_address(s) + hwreq->req.actual); 388 node->td_remaining_size = CI_MAX_BUF_SIZE - length; 389 } else { 390 temp = (u32) (hwreq->req.dma + hwreq->req.actual); 391 } 392 393 if (length) { 394 node->ptr->page[0] = cpu_to_le32(temp); 395 for (i = 1; i < TD_PAGE_COUNT; i++) { 396 u32 page = temp + i * CI_HDRC_PAGE_SIZE; 397 page &= ~TD_RESERVED_MASK; 398 node->ptr->page[i] = cpu_to_le32(page); 399 } 400 } 401 402 hwreq->req.actual += length; 403 404 if (!list_empty(&hwreq->tds)) { 405 /* get the last entry */ 406 lastnode = list_entry(hwreq->tds.prev, 407 struct td_node, td); 408 lastnode->ptr->next = cpu_to_le32(node->dma); 409 } 410 411 INIT_LIST_HEAD(&node->td); 412 list_add_tail(&node->td, &hwreq->tds); 413 414 return 0; 415} 416 417/** 418 * _usb_addr: calculates endpoint address from direction & number 419 * @ep: endpoint 420 */ 421static inline u8 _usb_addr(struct ci_hw_ep *ep) 422{ 423 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num; 424} 425 426static int prepare_td_for_non_sg(struct ci_hw_ep *hwep, 427 struct ci_hw_req *hwreq) 428{ 429 unsigned int rest = hwreq->req.length; 430 int pages = TD_PAGE_COUNT; 431 int ret = 0; 432 433 if (rest == 0) { 434 ret = add_td_to_list(hwep, hwreq, 0, NULL); 435 if (ret < 0) 436 return ret; 437 } 438 439 /* 440 * The first buffer could be not page aligned. 441 * In that case we have to span into one extra td. 442 */ 443 if (hwreq->req.dma % PAGE_SIZE) 444 pages--; 445 446 while (rest > 0) { 447 unsigned int count = min(hwreq->req.length - hwreq->req.actual, 448 (unsigned int)(pages * CI_HDRC_PAGE_SIZE)); 449 450 ret = add_td_to_list(hwep, hwreq, count, NULL); 451 if (ret < 0) 452 return ret; 453 454 rest -= count; 455 } 456 457 if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX 458 && (hwreq->req.length % hwep->ep.maxpacket == 0)) { 459 ret = add_td_to_list(hwep, hwreq, 0, NULL); 460 if (ret < 0) 461 return ret; 462 } 463 464 return ret; 465} 466 467static int prepare_td_per_sg(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq, 468 struct scatterlist *s) 469{ 470 unsigned int rest = sg_dma_len(s); 471 int ret = 0; 472 473 hwreq->req.actual = 0; 474 while (rest > 0) { 475 unsigned int count = min_t(unsigned int, rest, 476 CI_MAX_BUF_SIZE); 477 478 ret = add_td_to_list(hwep, hwreq, count, s); 479 if (ret < 0) 480 return ret; 481 482 rest -= count; 483 } 484 485 return ret; 486} 487 488static void ci_add_buffer_entry(struct td_node *node, struct scatterlist *s) 489{ 490 int empty_td_slot_index = (CI_MAX_BUF_SIZE - node->td_remaining_size) 491 / CI_HDRC_PAGE_SIZE; 492 int i; 493 u32 token; 494 495 token = le32_to_cpu(node->ptr->token) + (sg_dma_len(s) << __ffs(TD_TOTAL_BYTES)); 496 node->ptr->token = cpu_to_le32(token); 497 498 for (i = empty_td_slot_index; i < TD_PAGE_COUNT; i++) { 499 u32 page = (u32) sg_dma_address(s) + 500 (i - empty_td_slot_index) * CI_HDRC_PAGE_SIZE; 501 502 page &= ~TD_RESERVED_MASK; 503 node->ptr->page[i] = cpu_to_le32(page); 504 } 505} 506 507static int prepare_td_for_sg(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq) 508{ 509 struct usb_request *req = &hwreq->req; 510 struct scatterlist *s = req->sg; 511 int ret = 0, i = 0; 512 struct td_node *node = NULL; 513 514 if (!s || req->zero || req->length == 0) { 515 dev_err(hwep->ci->dev, "not supported operation for sg\n"); 516 return -EINVAL; 517 } 518 519 while (i++ < req->num_mapped_sgs) { 520 if (sg_dma_address(s) % PAGE_SIZE) { 521 dev_err(hwep->ci->dev, "not page aligned sg buffer\n"); 522 return -EINVAL; 523 } 524 525 if (node && (node->td_remaining_size >= sg_dma_len(s))) { 526 ci_add_buffer_entry(node, s); 527 node->td_remaining_size -= sg_dma_len(s); 528 } else { 529 ret = prepare_td_per_sg(hwep, hwreq, s); 530 if (ret) 531 return ret; 532 533 node = list_entry(hwreq->tds.prev, 534 struct td_node, td); 535 } 536 537 s = sg_next(s); 538 } 539 540 return ret; 541} 542 543/** 544 * _hardware_enqueue: configures a request at hardware level 545 * @hwep: endpoint 546 * @hwreq: request 547 * 548 * This function returns an error code 549 */ 550static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq) 551{ 552 struct ci_hdrc *ci = hwep->ci; 553 int ret = 0; 554 struct td_node *firstnode, *lastnode; 555 556 /* don't queue twice */ 557 if (hwreq->req.status == -EALREADY) 558 return -EALREADY; 559 560 hwreq->req.status = -EALREADY; 561 562 ret = usb_gadget_map_request_by_dev(ci->dev->parent, 563 &hwreq->req, hwep->dir); 564 if (ret) 565 return ret; 566 567 if (hwreq->req.num_mapped_sgs) 568 ret = prepare_td_for_sg(hwep, hwreq); 569 else 570 ret = prepare_td_for_non_sg(hwep, hwreq); 571 572 if (ret) 573 return ret; 574 575 lastnode = list_entry(hwreq->tds.prev, 576 struct td_node, td); 577 578 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE); 579 if (!hwreq->req.no_interrupt) 580 lastnode->ptr->token |= cpu_to_le32(TD_IOC); 581 582 list_for_each_entry_safe(firstnode, lastnode, &hwreq->tds, td) 583 trace_ci_prepare_td(hwep, hwreq, firstnode); 584 585 firstnode = list_first_entry(&hwreq->tds, struct td_node, td); 586 587 wmb(); 588 589 hwreq->req.actual = 0; 590 if (!list_empty(&hwep->qh.queue)) { 591 struct ci_hw_req *hwreqprev; 592 int n = hw_ep_bit(hwep->num, hwep->dir); 593 int tmp_stat; 594 struct td_node *prevlastnode; 595 u32 next = firstnode->dma & TD_ADDR_MASK; 596 597 hwreqprev = list_entry(hwep->qh.queue.prev, 598 struct ci_hw_req, queue); 599 prevlastnode = list_entry(hwreqprev->tds.prev, 600 struct td_node, td); 601 602 prevlastnode->ptr->next = cpu_to_le32(next); 603 wmb(); 604 605 if (ci->rev == CI_REVISION_22) { 606 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n))) 607 reprime_dtd(ci, hwep, prevlastnode); 608 } 609 610 if (hw_read(ci, OP_ENDPTPRIME, BIT(n))) 611 goto done; 612 do { 613 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW); 614 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n)); 615 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW)); 616 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0); 617 if (tmp_stat) 618 goto done; 619 } 620 621 /* QH configuration */ 622 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma); 623 hwep->qh.ptr->td.token &= 624 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE)); 625 626 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) { 627 u32 mul = hwreq->req.length / hwep->ep.maxpacket; 628 629 if (hwreq->req.length == 0 630 || hwreq->req.length % hwep->ep.maxpacket) 631 mul++; 632 hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT)); 633 } 634 635 ret = hw_ep_prime(ci, hwep->num, hwep->dir, 636 hwep->type == USB_ENDPOINT_XFER_CONTROL); 637done: 638 return ret; 639} 640 641/** 642 * free_pending_td: remove a pending request for the endpoint 643 * @hwep: endpoint 644 */ 645static void free_pending_td(struct ci_hw_ep *hwep) 646{ 647 struct td_node *pending = hwep->pending_td; 648 649 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma); 650 hwep->pending_td = NULL; 651 kfree(pending); 652} 653 654static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep, 655 struct td_node *node) 656{ 657 hwep->qh.ptr->td.next = cpu_to_le32(node->dma); 658 hwep->qh.ptr->td.token &= 659 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE)); 660 661 return hw_ep_prime(ci, hwep->num, hwep->dir, 662 hwep->type == USB_ENDPOINT_XFER_CONTROL); 663} 664 665/** 666 * _hardware_dequeue: handles a request at hardware level 667 * @hwep: endpoint 668 * @hwreq: request 669 * 670 * This function returns an error code 671 */ 672static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq) 673{ 674 u32 tmptoken; 675 struct td_node *node, *tmpnode; 676 unsigned remaining_length; 677 unsigned actual = hwreq->req.length; 678 struct ci_hdrc *ci = hwep->ci; 679 680 if (hwreq->req.status != -EALREADY) 681 return -EINVAL; 682 683 hwreq->req.status = 0; 684 685 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) { 686 tmptoken = le32_to_cpu(node->ptr->token); 687 trace_ci_complete_td(hwep, hwreq, node); 688 if ((TD_STATUS_ACTIVE & tmptoken) != 0) { 689 int n = hw_ep_bit(hwep->num, hwep->dir); 690 691 if (ci->rev == CI_REVISION_24 || 692 ci->rev == CI_REVISION_22) 693 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n))) 694 reprime_dtd(ci, hwep, node); 695 hwreq->req.status = -EALREADY; 696 return -EBUSY; 697 } 698 699 remaining_length = (tmptoken & TD_TOTAL_BYTES); 700 remaining_length >>= __ffs(TD_TOTAL_BYTES); 701 actual -= remaining_length; 702 703 hwreq->req.status = tmptoken & TD_STATUS; 704 if ((TD_STATUS_HALTED & hwreq->req.status)) { 705 hwreq->req.status = -EPIPE; 706 break; 707 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) { 708 hwreq->req.status = -EPROTO; 709 break; 710 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) { 711 hwreq->req.status = -EILSEQ; 712 break; 713 } 714 715 if (remaining_length) { 716 if (hwep->dir == TX) { 717 hwreq->req.status = -EPROTO; 718 break; 719 } 720 } 721 /* 722 * As the hardware could still address the freed td 723 * which will run the udc unusable, the cleanup of the 724 * td has to be delayed by one. 725 */ 726 if (hwep->pending_td) 727 free_pending_td(hwep); 728 729 hwep->pending_td = node; 730 list_del_init(&node->td); 731 } 732 733 usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent, 734 &hwreq->req, hwep->dir); 735 736 hwreq->req.actual += actual; 737 738 if (hwreq->req.status) 739 return hwreq->req.status; 740 741 return hwreq->req.actual; 742} 743 744/** 745 * _ep_nuke: dequeues all endpoint requests 746 * @hwep: endpoint 747 * 748 * This function returns an error code 749 * Caller must hold lock 750 */ 751static int _ep_nuke(struct ci_hw_ep *hwep) 752__releases(hwep->lock) 753__acquires(hwep->lock) 754{ 755 struct td_node *node, *tmpnode; 756 if (hwep == NULL) 757 return -EINVAL; 758 759 hw_ep_flush(hwep->ci, hwep->num, hwep->dir); 760 761 while (!list_empty(&hwep->qh.queue)) { 762 763 /* pop oldest request */ 764 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next, 765 struct ci_hw_req, queue); 766 767 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) { 768 dma_pool_free(hwep->td_pool, node->ptr, node->dma); 769 list_del_init(&node->td); 770 node->ptr = NULL; 771 kfree(node); 772 } 773 774 list_del_init(&hwreq->queue); 775 hwreq->req.status = -ESHUTDOWN; 776 777 if (hwreq->req.complete != NULL) { 778 spin_unlock(hwep->lock); 779 usb_gadget_giveback_request(&hwep->ep, &hwreq->req); 780 spin_lock(hwep->lock); 781 } 782 } 783 784 if (hwep->pending_td) 785 free_pending_td(hwep); 786 787 return 0; 788} 789 790static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer) 791{ 792 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 793 int direction, retval = 0; 794 unsigned long flags; 795 796 if (ep == NULL || hwep->ep.desc == NULL) 797 return -EINVAL; 798 799 if (usb_endpoint_xfer_isoc(hwep->ep.desc)) 800 return -EOPNOTSUPP; 801 802 spin_lock_irqsave(hwep->lock, flags); 803 804 if (value && hwep->dir == TX && check_transfer && 805 !list_empty(&hwep->qh.queue) && 806 !usb_endpoint_xfer_control(hwep->ep.desc)) { 807 spin_unlock_irqrestore(hwep->lock, flags); 808 return -EAGAIN; 809 } 810 811 direction = hwep->dir; 812 do { 813 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value); 814 815 if (!value) 816 hwep->wedge = 0; 817 818 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) 819 hwep->dir = (hwep->dir == TX) ? RX : TX; 820 821 } while (hwep->dir != direction); 822 823 spin_unlock_irqrestore(hwep->lock, flags); 824 return retval; 825} 826 827 828/** 829 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts 830 * @gadget: gadget 831 * 832 * This function returns an error code 833 */ 834static int _gadget_stop_activity(struct usb_gadget *gadget) 835{ 836 struct usb_ep *ep; 837 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget); 838 unsigned long flags; 839 840 /* flush all endpoints */ 841 gadget_for_each_ep(ep, gadget) { 842 usb_ep_fifo_flush(ep); 843 } 844 usb_ep_fifo_flush(&ci->ep0out->ep); 845 usb_ep_fifo_flush(&ci->ep0in->ep); 846 847 /* make sure to disable all endpoints */ 848 gadget_for_each_ep(ep, gadget) { 849 usb_ep_disable(ep); 850 } 851 852 if (ci->status != NULL) { 853 usb_ep_free_request(&ci->ep0in->ep, ci->status); 854 ci->status = NULL; 855 } 856 857 spin_lock_irqsave(&ci->lock, flags); 858 ci->gadget.speed = USB_SPEED_UNKNOWN; 859 ci->remote_wakeup = 0; 860 ci->suspended = 0; 861 spin_unlock_irqrestore(&ci->lock, flags); 862 863 return 0; 864} 865 866/****************************************************************************** 867 * ISR block 868 *****************************************************************************/ 869/** 870 * isr_reset_handler: USB reset interrupt handler 871 * @ci: UDC device 872 * 873 * This function resets USB engine after a bus reset occurred 874 */ 875static void isr_reset_handler(struct ci_hdrc *ci) 876__releases(ci->lock) 877__acquires(ci->lock) 878{ 879 int retval; 880 881 spin_unlock(&ci->lock); 882 if (ci->gadget.speed != USB_SPEED_UNKNOWN) 883 usb_gadget_udc_reset(&ci->gadget, ci->driver); 884 885 retval = _gadget_stop_activity(&ci->gadget); 886 if (retval) 887 goto done; 888 889 retval = hw_usb_reset(ci); 890 if (retval) 891 goto done; 892 893 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC); 894 if (ci->status == NULL) 895 retval = -ENOMEM; 896 897done: 898 spin_lock(&ci->lock); 899 900 if (retval) 901 dev_err(ci->dev, "error: %i\n", retval); 902} 903 904/** 905 * isr_get_status_complete: get_status request complete function 906 * @ep: endpoint 907 * @req: request handled 908 * 909 * Caller must release lock 910 */ 911static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req) 912{ 913 if (ep == NULL || req == NULL) 914 return; 915 916 kfree(req->buf); 917 usb_ep_free_request(ep, req); 918} 919 920/** 921 * _ep_queue: queues (submits) an I/O request to an endpoint 922 * @ep: endpoint 923 * @req: request 924 * @gfp_flags: GFP flags (not used) 925 * 926 * Caller must hold lock 927 * This function returns an error code 928 */ 929static int _ep_queue(struct usb_ep *ep, struct usb_request *req, 930 gfp_t __maybe_unused gfp_flags) 931{ 932 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 933 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req); 934 struct ci_hdrc *ci = hwep->ci; 935 int retval = 0; 936 937 if (ep == NULL || req == NULL || hwep->ep.desc == NULL) 938 return -EINVAL; 939 940 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) { 941 if (req->length) 942 hwep = (ci->ep0_dir == RX) ? 943 ci->ep0out : ci->ep0in; 944 if (!list_empty(&hwep->qh.queue)) { 945 _ep_nuke(hwep); 946 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n", 947 _usb_addr(hwep)); 948 } 949 } 950 951 if (usb_endpoint_xfer_isoc(hwep->ep.desc) && 952 hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) { 953 dev_err(hwep->ci->dev, "request length too big for isochronous\n"); 954 return -EMSGSIZE; 955 } 956 957 /* first nuke then test link, e.g. previous status has not sent */ 958 if (!list_empty(&hwreq->queue)) { 959 dev_err(hwep->ci->dev, "request already in queue\n"); 960 return -EBUSY; 961 } 962 963 /* push request */ 964 hwreq->req.status = -EINPROGRESS; 965 hwreq->req.actual = 0; 966 967 retval = _hardware_enqueue(hwep, hwreq); 968 969 if (retval == -EALREADY) 970 retval = 0; 971 if (!retval) 972 list_add_tail(&hwreq->queue, &hwep->qh.queue); 973 974 return retval; 975} 976 977/** 978 * isr_get_status_response: get_status request response 979 * @ci: ci struct 980 * @setup: setup request packet 981 * 982 * This function returns an error code 983 */ 984static int isr_get_status_response(struct ci_hdrc *ci, 985 struct usb_ctrlrequest *setup) 986__releases(hwep->lock) 987__acquires(hwep->lock) 988{ 989 struct ci_hw_ep *hwep = ci->ep0in; 990 struct usb_request *req = NULL; 991 gfp_t gfp_flags = GFP_ATOMIC; 992 int dir, num, retval; 993 994 if (hwep == NULL || setup == NULL) 995 return -EINVAL; 996 997 spin_unlock(hwep->lock); 998 req = usb_ep_alloc_request(&hwep->ep, gfp_flags); 999 spin_lock(hwep->lock); 1000 if (req == NULL) 1001 return -ENOMEM; 1002 1003 req->complete = isr_get_status_complete; 1004 req->length = 2; 1005 req->buf = kzalloc(req->length, gfp_flags); 1006 if (req->buf == NULL) { 1007 retval = -ENOMEM; 1008 goto err_free_req; 1009 } 1010 1011 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) { 1012 *(u16 *)req->buf = (ci->remote_wakeup << 1) | 1013 ci->gadget.is_selfpowered; 1014 } else if ((setup->bRequestType & USB_RECIP_MASK) \ 1015 == USB_RECIP_ENDPOINT) { 1016 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ? 1017 TX : RX; 1018 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK; 1019 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir); 1020 } 1021 /* else do nothing; reserved for future use */ 1022 1023 retval = _ep_queue(&hwep->ep, req, gfp_flags); 1024 if (retval) 1025 goto err_free_buf; 1026 1027 return 0; 1028 1029 err_free_buf: 1030 kfree(req->buf); 1031 err_free_req: 1032 spin_unlock(hwep->lock); 1033 usb_ep_free_request(&hwep->ep, req); 1034 spin_lock(hwep->lock); 1035 return retval; 1036} 1037 1038/** 1039 * isr_setup_status_complete: setup_status request complete function 1040 * @ep: endpoint 1041 * @req: request handled 1042 * 1043 * Caller must release lock. Put the port in test mode if test mode 1044 * feature is selected. 1045 */ 1046static void 1047isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req) 1048{ 1049 struct ci_hdrc *ci = req->context; 1050 unsigned long flags; 1051 1052 if (req->status < 0) 1053 return; 1054 1055 if (ci->setaddr) { 1056 hw_usb_set_address(ci, ci->address); 1057 ci->setaddr = false; 1058 if (ci->address) 1059 usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS); 1060 } 1061 1062 spin_lock_irqsave(&ci->lock, flags); 1063 if (ci->test_mode) 1064 hw_port_test_set(ci, ci->test_mode); 1065 spin_unlock_irqrestore(&ci->lock, flags); 1066} 1067 1068/** 1069 * isr_setup_status_phase: queues the status phase of a setup transation 1070 * @ci: ci struct 1071 * 1072 * This function returns an error code 1073 */ 1074static int isr_setup_status_phase(struct ci_hdrc *ci) 1075{ 1076 struct ci_hw_ep *hwep; 1077 1078 /* 1079 * Unexpected USB controller behavior, caused by bad signal integrity 1080 * or ground reference problems, can lead to isr_setup_status_phase 1081 * being called with ci->status equal to NULL. 1082 * If this situation occurs, you should review your USB hardware design. 1083 */ 1084 if (WARN_ON_ONCE(!ci->status)) 1085 return -EPIPE; 1086 1087 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in; 1088 ci->status->context = ci; 1089 ci->status->complete = isr_setup_status_complete; 1090 1091 return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC); 1092} 1093 1094/** 1095 * isr_tr_complete_low: transaction complete low level handler 1096 * @hwep: endpoint 1097 * 1098 * This function returns an error code 1099 * Caller must hold lock 1100 */ 1101static int isr_tr_complete_low(struct ci_hw_ep *hwep) 1102__releases(hwep->lock) 1103__acquires(hwep->lock) 1104{ 1105 struct ci_hw_req *hwreq, *hwreqtemp; 1106 struct ci_hw_ep *hweptemp = hwep; 1107 int retval = 0; 1108 1109 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue, 1110 queue) { 1111 retval = _hardware_dequeue(hwep, hwreq); 1112 if (retval < 0) 1113 break; 1114 list_del_init(&hwreq->queue); 1115 if (hwreq->req.complete != NULL) { 1116 spin_unlock(hwep->lock); 1117 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) && 1118 hwreq->req.length) 1119 hweptemp = hwep->ci->ep0in; 1120 usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req); 1121 spin_lock(hwep->lock); 1122 } 1123 } 1124 1125 if (retval == -EBUSY) 1126 retval = 0; 1127 1128 return retval; 1129} 1130 1131static int otg_a_alt_hnp_support(struct ci_hdrc *ci) 1132{ 1133 dev_warn(&ci->gadget.dev, 1134 "connect the device to an alternate port if you want HNP\n"); 1135 return isr_setup_status_phase(ci); 1136} 1137 1138/** 1139 * isr_setup_packet_handler: setup packet handler 1140 * @ci: UDC descriptor 1141 * 1142 * This function handles setup packet 1143 */ 1144static void isr_setup_packet_handler(struct ci_hdrc *ci) 1145__releases(ci->lock) 1146__acquires(ci->lock) 1147{ 1148 struct ci_hw_ep *hwep = &ci->ci_hw_ep[0]; 1149 struct usb_ctrlrequest req; 1150 int type, num, dir, err = -EINVAL; 1151 u8 tmode = 0; 1152 1153 /* 1154 * Flush data and handshake transactions of previous 1155 * setup packet. 1156 */ 1157 _ep_nuke(ci->ep0out); 1158 _ep_nuke(ci->ep0in); 1159 1160 /* read_setup_packet */ 1161 do { 1162 hw_test_and_set_setup_guard(ci); 1163 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req)); 1164 } while (!hw_test_and_clear_setup_guard(ci)); 1165 1166 type = req.bRequestType; 1167 1168 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX; 1169 1170 switch (req.bRequest) { 1171 case USB_REQ_CLEAR_FEATURE: 1172 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) && 1173 le16_to_cpu(req.wValue) == 1174 USB_ENDPOINT_HALT) { 1175 if (req.wLength != 0) 1176 break; 1177 num = le16_to_cpu(req.wIndex); 1178 dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX; 1179 num &= USB_ENDPOINT_NUMBER_MASK; 1180 if (dir == TX) 1181 num += ci->hw_ep_max / 2; 1182 if (!ci->ci_hw_ep[num].wedge) { 1183 spin_unlock(&ci->lock); 1184 err = usb_ep_clear_halt( 1185 &ci->ci_hw_ep[num].ep); 1186 spin_lock(&ci->lock); 1187 if (err) 1188 break; 1189 } 1190 err = isr_setup_status_phase(ci); 1191 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) && 1192 le16_to_cpu(req.wValue) == 1193 USB_DEVICE_REMOTE_WAKEUP) { 1194 if (req.wLength != 0) 1195 break; 1196 ci->remote_wakeup = 0; 1197 err = isr_setup_status_phase(ci); 1198 } else { 1199 goto delegate; 1200 } 1201 break; 1202 case USB_REQ_GET_STATUS: 1203 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) || 1204 le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) && 1205 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) && 1206 type != (USB_DIR_IN|USB_RECIP_INTERFACE)) 1207 goto delegate; 1208 if (le16_to_cpu(req.wLength) != 2 || 1209 le16_to_cpu(req.wValue) != 0) 1210 break; 1211 err = isr_get_status_response(ci, &req); 1212 break; 1213 case USB_REQ_SET_ADDRESS: 1214 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE)) 1215 goto delegate; 1216 if (le16_to_cpu(req.wLength) != 0 || 1217 le16_to_cpu(req.wIndex) != 0) 1218 break; 1219 ci->address = (u8)le16_to_cpu(req.wValue); 1220 ci->setaddr = true; 1221 err = isr_setup_status_phase(ci); 1222 break; 1223 case USB_REQ_SET_FEATURE: 1224 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) && 1225 le16_to_cpu(req.wValue) == 1226 USB_ENDPOINT_HALT) { 1227 if (req.wLength != 0) 1228 break; 1229 num = le16_to_cpu(req.wIndex); 1230 dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX; 1231 num &= USB_ENDPOINT_NUMBER_MASK; 1232 if (dir == TX) 1233 num += ci->hw_ep_max / 2; 1234 1235 spin_unlock(&ci->lock); 1236 err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false); 1237 spin_lock(&ci->lock); 1238 if (!err) 1239 isr_setup_status_phase(ci); 1240 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) { 1241 if (req.wLength != 0) 1242 break; 1243 switch (le16_to_cpu(req.wValue)) { 1244 case USB_DEVICE_REMOTE_WAKEUP: 1245 ci->remote_wakeup = 1; 1246 err = isr_setup_status_phase(ci); 1247 break; 1248 case USB_DEVICE_TEST_MODE: 1249 tmode = le16_to_cpu(req.wIndex) >> 8; 1250 switch (tmode) { 1251 case USB_TEST_J: 1252 case USB_TEST_K: 1253 case USB_TEST_SE0_NAK: 1254 case USB_TEST_PACKET: 1255 case USB_TEST_FORCE_ENABLE: 1256 ci->test_mode = tmode; 1257 err = isr_setup_status_phase( 1258 ci); 1259 break; 1260 default: 1261 break; 1262 } 1263 break; 1264 case USB_DEVICE_B_HNP_ENABLE: 1265 if (ci_otg_is_fsm_mode(ci)) { 1266 ci->gadget.b_hnp_enable = 1; 1267 err = isr_setup_status_phase( 1268 ci); 1269 } 1270 break; 1271 case USB_DEVICE_A_ALT_HNP_SUPPORT: 1272 if (ci_otg_is_fsm_mode(ci)) 1273 err = otg_a_alt_hnp_support(ci); 1274 break; 1275 case USB_DEVICE_A_HNP_SUPPORT: 1276 if (ci_otg_is_fsm_mode(ci)) { 1277 ci->gadget.a_hnp_support = 1; 1278 err = isr_setup_status_phase( 1279 ci); 1280 } 1281 break; 1282 default: 1283 goto delegate; 1284 } 1285 } else { 1286 goto delegate; 1287 } 1288 break; 1289 default: 1290delegate: 1291 if (req.wLength == 0) /* no data phase */ 1292 ci->ep0_dir = TX; 1293 1294 spin_unlock(&ci->lock); 1295 err = ci->driver->setup(&ci->gadget, &req); 1296 spin_lock(&ci->lock); 1297 break; 1298 } 1299 1300 if (err < 0) { 1301 spin_unlock(&ci->lock); 1302 if (_ep_set_halt(&hwep->ep, 1, false)) 1303 dev_err(ci->dev, "error: _ep_set_halt\n"); 1304 spin_lock(&ci->lock); 1305 } 1306} 1307 1308/** 1309 * isr_tr_complete_handler: transaction complete interrupt handler 1310 * @ci: UDC descriptor 1311 * 1312 * This function handles traffic events 1313 */ 1314static void isr_tr_complete_handler(struct ci_hdrc *ci) 1315__releases(ci->lock) 1316__acquires(ci->lock) 1317{ 1318 unsigned i; 1319 int err; 1320 1321 for (i = 0; i < ci->hw_ep_max; i++) { 1322 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i]; 1323 1324 if (hwep->ep.desc == NULL) 1325 continue; /* not configured */ 1326 1327 if (hw_test_and_clear_complete(ci, i)) { 1328 err = isr_tr_complete_low(hwep); 1329 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) { 1330 if (err > 0) /* needs status phase */ 1331 err = isr_setup_status_phase(ci); 1332 if (err < 0) { 1333 spin_unlock(&ci->lock); 1334 if (_ep_set_halt(&hwep->ep, 1, false)) 1335 dev_err(ci->dev, 1336 "error: _ep_set_halt\n"); 1337 spin_lock(&ci->lock); 1338 } 1339 } 1340 } 1341 1342 /* Only handle setup packet below */ 1343 if (i == 0 && 1344 hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0))) 1345 isr_setup_packet_handler(ci); 1346 } 1347} 1348 1349/****************************************************************************** 1350 * ENDPT block 1351 *****************************************************************************/ 1352/* 1353 * ep_enable: configure endpoint, making it usable 1354 * 1355 * Check usb_ep_enable() at "usb_gadget.h" for details 1356 */ 1357static int ep_enable(struct usb_ep *ep, 1358 const struct usb_endpoint_descriptor *desc) 1359{ 1360 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1361 int retval = 0; 1362 unsigned long flags; 1363 u32 cap = 0; 1364 1365 if (ep == NULL || desc == NULL) 1366 return -EINVAL; 1367 1368 spin_lock_irqsave(hwep->lock, flags); 1369 1370 /* only internal SW should enable ctrl endpts */ 1371 1372 if (!list_empty(&hwep->qh.queue)) { 1373 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n"); 1374 spin_unlock_irqrestore(hwep->lock, flags); 1375 return -EBUSY; 1376 } 1377 1378 hwep->ep.desc = desc; 1379 1380 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX; 1381 hwep->num = usb_endpoint_num(desc); 1382 hwep->type = usb_endpoint_type(desc); 1383 1384 hwep->ep.maxpacket = usb_endpoint_maxp(desc); 1385 hwep->ep.mult = usb_endpoint_maxp_mult(desc); 1386 1387 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) 1388 cap |= QH_IOS; 1389 1390 cap |= QH_ZLT; 1391 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT; 1392 /* 1393 * For ISO-TX, we set mult at QH as the largest value, and use 1394 * MultO at TD as real mult value. 1395 */ 1396 if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) 1397 cap |= 3 << __ffs(QH_MULT); 1398 1399 hwep->qh.ptr->cap = cpu_to_le32(cap); 1400 1401 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */ 1402 1403 if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) { 1404 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n"); 1405 retval = -EINVAL; 1406 } 1407 1408 /* 1409 * Enable endpoints in the HW other than ep0 as ep0 1410 * is always enabled 1411 */ 1412 if (hwep->num) 1413 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir, 1414 hwep->type); 1415 1416 spin_unlock_irqrestore(hwep->lock, flags); 1417 return retval; 1418} 1419 1420/* 1421 * ep_disable: endpoint is no longer usable 1422 * 1423 * Check usb_ep_disable() at "usb_gadget.h" for details 1424 */ 1425static int ep_disable(struct usb_ep *ep) 1426{ 1427 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1428 int direction, retval = 0; 1429 unsigned long flags; 1430 1431 if (ep == NULL) 1432 return -EINVAL; 1433 else if (hwep->ep.desc == NULL) 1434 return -EBUSY; 1435 1436 spin_lock_irqsave(hwep->lock, flags); 1437 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) { 1438 spin_unlock_irqrestore(hwep->lock, flags); 1439 return 0; 1440 } 1441 1442 /* only internal SW should disable ctrl endpts */ 1443 1444 direction = hwep->dir; 1445 do { 1446 retval |= _ep_nuke(hwep); 1447 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir); 1448 1449 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) 1450 hwep->dir = (hwep->dir == TX) ? RX : TX; 1451 1452 } while (hwep->dir != direction); 1453 1454 hwep->ep.desc = NULL; 1455 1456 spin_unlock_irqrestore(hwep->lock, flags); 1457 return retval; 1458} 1459 1460/* 1461 * ep_alloc_request: allocate a request object to use with this endpoint 1462 * 1463 * Check usb_ep_alloc_request() at "usb_gadget.h" for details 1464 */ 1465static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags) 1466{ 1467 struct ci_hw_req *hwreq; 1468 1469 if (ep == NULL) 1470 return NULL; 1471 1472 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags); 1473 if (hwreq != NULL) { 1474 INIT_LIST_HEAD(&hwreq->queue); 1475 INIT_LIST_HEAD(&hwreq->tds); 1476 } 1477 1478 return (hwreq == NULL) ? NULL : &hwreq->req; 1479} 1480 1481/* 1482 * ep_free_request: frees a request object 1483 * 1484 * Check usb_ep_free_request() at "usb_gadget.h" for details 1485 */ 1486static void ep_free_request(struct usb_ep *ep, struct usb_request *req) 1487{ 1488 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1489 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req); 1490 struct td_node *node, *tmpnode; 1491 unsigned long flags; 1492 1493 if (ep == NULL || req == NULL) { 1494 return; 1495 } else if (!list_empty(&hwreq->queue)) { 1496 dev_err(hwep->ci->dev, "freeing queued request\n"); 1497 return; 1498 } 1499 1500 spin_lock_irqsave(hwep->lock, flags); 1501 1502 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) { 1503 dma_pool_free(hwep->td_pool, node->ptr, node->dma); 1504 list_del_init(&node->td); 1505 node->ptr = NULL; 1506 kfree(node); 1507 } 1508 1509 kfree(hwreq); 1510 1511 spin_unlock_irqrestore(hwep->lock, flags); 1512} 1513 1514/* 1515 * ep_queue: queues (submits) an I/O request to an endpoint 1516 * 1517 * Check usb_ep_queue()* at usb_gadget.h" for details 1518 */ 1519static int ep_queue(struct usb_ep *ep, struct usb_request *req, 1520 gfp_t __maybe_unused gfp_flags) 1521{ 1522 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1523 int retval = 0; 1524 unsigned long flags; 1525 1526 if (ep == NULL || req == NULL || hwep->ep.desc == NULL) 1527 return -EINVAL; 1528 1529 spin_lock_irqsave(hwep->lock, flags); 1530 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) { 1531 spin_unlock_irqrestore(hwep->lock, flags); 1532 return 0; 1533 } 1534 retval = _ep_queue(ep, req, gfp_flags); 1535 spin_unlock_irqrestore(hwep->lock, flags); 1536 return retval; 1537} 1538 1539/* 1540 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint 1541 * 1542 * Check usb_ep_dequeue() at "usb_gadget.h" for details 1543 */ 1544static int ep_dequeue(struct usb_ep *ep, struct usb_request *req) 1545{ 1546 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1547 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req); 1548 unsigned long flags; 1549 struct td_node *node, *tmpnode; 1550 1551 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY || 1552 hwep->ep.desc == NULL || list_empty(&hwreq->queue) || 1553 list_empty(&hwep->qh.queue)) 1554 return -EINVAL; 1555 1556 spin_lock_irqsave(hwep->lock, flags); 1557 if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN) 1558 hw_ep_flush(hwep->ci, hwep->num, hwep->dir); 1559 1560 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) { 1561 dma_pool_free(hwep->td_pool, node->ptr, node->dma); 1562 list_del(&node->td); 1563 kfree(node); 1564 } 1565 1566 /* pop request */ 1567 list_del_init(&hwreq->queue); 1568 1569 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir); 1570 1571 req->status = -ECONNRESET; 1572 1573 if (hwreq->req.complete != NULL) { 1574 spin_unlock(hwep->lock); 1575 usb_gadget_giveback_request(&hwep->ep, &hwreq->req); 1576 spin_lock(hwep->lock); 1577 } 1578 1579 spin_unlock_irqrestore(hwep->lock, flags); 1580 return 0; 1581} 1582 1583/* 1584 * ep_set_halt: sets the endpoint halt feature 1585 * 1586 * Check usb_ep_set_halt() at "usb_gadget.h" for details 1587 */ 1588static int ep_set_halt(struct usb_ep *ep, int value) 1589{ 1590 return _ep_set_halt(ep, value, true); 1591} 1592 1593/* 1594 * ep_set_wedge: sets the halt feature and ignores clear requests 1595 * 1596 * Check usb_ep_set_wedge() at "usb_gadget.h" for details 1597 */ 1598static int ep_set_wedge(struct usb_ep *ep) 1599{ 1600 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1601 unsigned long flags; 1602 1603 if (ep == NULL || hwep->ep.desc == NULL) 1604 return -EINVAL; 1605 1606 spin_lock_irqsave(hwep->lock, flags); 1607 hwep->wedge = 1; 1608 spin_unlock_irqrestore(hwep->lock, flags); 1609 1610 return usb_ep_set_halt(ep); 1611} 1612 1613/* 1614 * ep_fifo_flush: flushes contents of a fifo 1615 * 1616 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details 1617 */ 1618static void ep_fifo_flush(struct usb_ep *ep) 1619{ 1620 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1621 unsigned long flags; 1622 1623 if (ep == NULL) { 1624 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep)); 1625 return; 1626 } 1627 1628 spin_lock_irqsave(hwep->lock, flags); 1629 if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) { 1630 spin_unlock_irqrestore(hwep->lock, flags); 1631 return; 1632 } 1633 1634 hw_ep_flush(hwep->ci, hwep->num, hwep->dir); 1635 1636 spin_unlock_irqrestore(hwep->lock, flags); 1637} 1638 1639/* 1640 * Endpoint-specific part of the API to the USB controller hardware 1641 * Check "usb_gadget.h" for details 1642 */ 1643static const struct usb_ep_ops usb_ep_ops = { 1644 .enable = ep_enable, 1645 .disable = ep_disable, 1646 .alloc_request = ep_alloc_request, 1647 .free_request = ep_free_request, 1648 .queue = ep_queue, 1649 .dequeue = ep_dequeue, 1650 .set_halt = ep_set_halt, 1651 .set_wedge = ep_set_wedge, 1652 .fifo_flush = ep_fifo_flush, 1653}; 1654 1655/****************************************************************************** 1656 * GADGET block 1657 *****************************************************************************/ 1658 1659static int ci_udc_get_frame(struct usb_gadget *_gadget) 1660{ 1661 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1662 unsigned long flags; 1663 int ret; 1664 1665 spin_lock_irqsave(&ci->lock, flags); 1666 ret = hw_read(ci, OP_FRINDEX, 0x3fff); 1667 spin_unlock_irqrestore(&ci->lock, flags); 1668 return ret >> 3; 1669} 1670 1671/* 1672 * ci_hdrc_gadget_connect: caller makes sure gadget driver is binded 1673 */ 1674static void ci_hdrc_gadget_connect(struct usb_gadget *_gadget, int is_active) 1675{ 1676 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1677 1678 if (is_active) { 1679 pm_runtime_get_sync(ci->dev); 1680 hw_device_reset(ci); 1681 spin_lock_irq(&ci->lock); 1682 if (ci->driver) { 1683 hw_device_state(ci, ci->ep0out->qh.dma); 1684 usb_gadget_set_state(_gadget, USB_STATE_POWERED); 1685 spin_unlock_irq(&ci->lock); 1686 usb_udc_vbus_handler(_gadget, true); 1687 } else { 1688 spin_unlock_irq(&ci->lock); 1689 } 1690 } else { 1691 usb_udc_vbus_handler(_gadget, false); 1692 if (ci->driver) 1693 ci->driver->disconnect(&ci->gadget); 1694 hw_device_state(ci, 0); 1695 if (ci->platdata->notify_event) 1696 ci->platdata->notify_event(ci, 1697 CI_HDRC_CONTROLLER_STOPPED_EVENT); 1698 _gadget_stop_activity(&ci->gadget); 1699 pm_runtime_put_sync(ci->dev); 1700 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED); 1701 } 1702} 1703 1704static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active) 1705{ 1706 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1707 unsigned long flags; 1708 int ret = 0; 1709 1710 spin_lock_irqsave(&ci->lock, flags); 1711 ci->vbus_active = is_active; 1712 spin_unlock_irqrestore(&ci->lock, flags); 1713 1714 if (ci->usb_phy) 1715 usb_phy_set_charger_state(ci->usb_phy, is_active ? 1716 USB_CHARGER_PRESENT : USB_CHARGER_ABSENT); 1717 1718 if (ci->platdata->notify_event) 1719 ret = ci->platdata->notify_event(ci, 1720 CI_HDRC_CONTROLLER_VBUS_EVENT); 1721 1722 if (ci->usb_phy) { 1723 if (is_active) 1724 usb_phy_set_event(ci->usb_phy, USB_EVENT_VBUS); 1725 else 1726 usb_phy_set_event(ci->usb_phy, USB_EVENT_NONE); 1727 } 1728 1729 if (ci->driver) 1730 ci_hdrc_gadget_connect(_gadget, is_active); 1731 1732 return ret; 1733} 1734 1735static int ci_udc_wakeup(struct usb_gadget *_gadget) 1736{ 1737 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1738 unsigned long flags; 1739 int ret = 0; 1740 1741 spin_lock_irqsave(&ci->lock, flags); 1742 if (ci->gadget.speed == USB_SPEED_UNKNOWN) { 1743 spin_unlock_irqrestore(&ci->lock, flags); 1744 return 0; 1745 } 1746 if (!ci->remote_wakeup) { 1747 ret = -EOPNOTSUPP; 1748 goto out; 1749 } 1750 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) { 1751 ret = -EINVAL; 1752 goto out; 1753 } 1754 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR); 1755out: 1756 spin_unlock_irqrestore(&ci->lock, flags); 1757 return ret; 1758} 1759 1760static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma) 1761{ 1762 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1763 1764 if (ci->usb_phy) 1765 return usb_phy_set_power(ci->usb_phy, ma); 1766 return -ENOTSUPP; 1767} 1768 1769static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on) 1770{ 1771 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1772 struct ci_hw_ep *hwep = ci->ep0in; 1773 unsigned long flags; 1774 1775 spin_lock_irqsave(hwep->lock, flags); 1776 _gadget->is_selfpowered = (is_on != 0); 1777 spin_unlock_irqrestore(hwep->lock, flags); 1778 1779 return 0; 1780} 1781 1782/* Change Data+ pullup status 1783 * this func is used by usb_gadget_connect/disconnect 1784 */ 1785static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on) 1786{ 1787 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1788 1789 /* 1790 * Data+ pullup controlled by OTG state machine in OTG fsm mode; 1791 * and don't touch Data+ in host mode for dual role config. 1792 */ 1793 if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST) 1794 return 0; 1795 1796 pm_runtime_get_sync(ci->dev); 1797 if (is_on) 1798 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS); 1799 else 1800 hw_write(ci, OP_USBCMD, USBCMD_RS, 0); 1801 pm_runtime_put_sync(ci->dev); 1802 1803 return 0; 1804} 1805 1806static int ci_udc_start(struct usb_gadget *gadget, 1807 struct usb_gadget_driver *driver); 1808static int ci_udc_stop(struct usb_gadget *gadget); 1809 1810/* Match ISOC IN from the highest endpoint */ 1811static struct usb_ep *ci_udc_match_ep(struct usb_gadget *gadget, 1812 struct usb_endpoint_descriptor *desc, 1813 struct usb_ss_ep_comp_descriptor *comp_desc) 1814{ 1815 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget); 1816 struct usb_ep *ep; 1817 1818 if (usb_endpoint_xfer_isoc(desc) && usb_endpoint_dir_in(desc)) { 1819 list_for_each_entry_reverse(ep, &ci->gadget.ep_list, ep_list) { 1820 if (ep->caps.dir_in && !ep->claimed) 1821 return ep; 1822 } 1823 } 1824 1825 return NULL; 1826} 1827 1828/* 1829 * Device operations part of the API to the USB controller hardware, 1830 * which don't involve endpoints (or i/o) 1831 * Check "usb_gadget.h" for details 1832 */ 1833static const struct usb_gadget_ops usb_gadget_ops = { 1834 .get_frame = ci_udc_get_frame, 1835 .vbus_session = ci_udc_vbus_session, 1836 .wakeup = ci_udc_wakeup, 1837 .set_selfpowered = ci_udc_selfpowered, 1838 .pullup = ci_udc_pullup, 1839 .vbus_draw = ci_udc_vbus_draw, 1840 .udc_start = ci_udc_start, 1841 .udc_stop = ci_udc_stop, 1842 .match_ep = ci_udc_match_ep, 1843}; 1844 1845static int init_eps(struct ci_hdrc *ci) 1846{ 1847 int retval = 0, i, j; 1848 1849 for (i = 0; i < ci->hw_ep_max/2; i++) 1850 for (j = RX; j <= TX; j++) { 1851 int k = i + j * ci->hw_ep_max/2; 1852 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k]; 1853 1854 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i, 1855 (j == TX) ? "in" : "out"); 1856 1857 hwep->ci = ci; 1858 hwep->lock = &ci->lock; 1859 hwep->td_pool = ci->td_pool; 1860 1861 hwep->ep.name = hwep->name; 1862 hwep->ep.ops = &usb_ep_ops; 1863 1864 if (i == 0) { 1865 hwep->ep.caps.type_control = true; 1866 } else { 1867 hwep->ep.caps.type_iso = true; 1868 hwep->ep.caps.type_bulk = true; 1869 hwep->ep.caps.type_int = true; 1870 } 1871 1872 if (j == TX) 1873 hwep->ep.caps.dir_in = true; 1874 else 1875 hwep->ep.caps.dir_out = true; 1876 1877 /* 1878 * for ep0: maxP defined in desc, for other 1879 * eps, maxP is set by epautoconfig() called 1880 * by gadget layer 1881 */ 1882 usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0); 1883 1884 INIT_LIST_HEAD(&hwep->qh.queue); 1885 hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL, 1886 &hwep->qh.dma); 1887 if (hwep->qh.ptr == NULL) 1888 retval = -ENOMEM; 1889 1890 /* 1891 * set up shorthands for ep0 out and in endpoints, 1892 * don't add to gadget's ep_list 1893 */ 1894 if (i == 0) { 1895 if (j == RX) 1896 ci->ep0out = hwep; 1897 else 1898 ci->ep0in = hwep; 1899 1900 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX); 1901 continue; 1902 } 1903 1904 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list); 1905 } 1906 1907 return retval; 1908} 1909 1910static void destroy_eps(struct ci_hdrc *ci) 1911{ 1912 int i; 1913 1914 for (i = 0; i < ci->hw_ep_max; i++) { 1915 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i]; 1916 1917 if (hwep->pending_td) 1918 free_pending_td(hwep); 1919 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma); 1920 } 1921} 1922 1923/** 1924 * ci_udc_start: register a gadget driver 1925 * @gadget: our gadget 1926 * @driver: the driver being registered 1927 * 1928 * Interrupts are enabled here. 1929 */ 1930static int ci_udc_start(struct usb_gadget *gadget, 1931 struct usb_gadget_driver *driver) 1932{ 1933 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget); 1934 int retval; 1935 1936 if (driver->disconnect == NULL) 1937 return -EINVAL; 1938 1939 ci->ep0out->ep.desc = &ctrl_endpt_out_desc; 1940 retval = usb_ep_enable(&ci->ep0out->ep); 1941 if (retval) 1942 return retval; 1943 1944 ci->ep0in->ep.desc = &ctrl_endpt_in_desc; 1945 retval = usb_ep_enable(&ci->ep0in->ep); 1946 if (retval) 1947 return retval; 1948 1949 ci->driver = driver; 1950 1951 /* Start otg fsm for B-device */ 1952 if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) { 1953 ci_hdrc_otg_fsm_start(ci); 1954 return retval; 1955 } 1956 1957 if (ci->vbus_active) 1958 ci_hdrc_gadget_connect(gadget, 1); 1959 else 1960 usb_udc_vbus_handler(&ci->gadget, false); 1961 1962 return retval; 1963} 1964 1965static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci) 1966{ 1967 if (!ci_otg_is_fsm_mode(ci)) 1968 return; 1969 1970 mutex_lock(&ci->fsm.lock); 1971 if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) { 1972 ci->fsm.a_bidl_adis_tmout = 1; 1973 ci_hdrc_otg_fsm_start(ci); 1974 } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) { 1975 ci->fsm.protocol = PROTO_UNDEF; 1976 ci->fsm.otg->state = OTG_STATE_UNDEFINED; 1977 } 1978 mutex_unlock(&ci->fsm.lock); 1979} 1980 1981/* 1982 * ci_udc_stop: unregister a gadget driver 1983 */ 1984static int ci_udc_stop(struct usb_gadget *gadget) 1985{ 1986 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget); 1987 unsigned long flags; 1988 1989 spin_lock_irqsave(&ci->lock, flags); 1990 ci->driver = NULL; 1991 1992 if (ci->vbus_active) { 1993 hw_device_state(ci, 0); 1994 spin_unlock_irqrestore(&ci->lock, flags); 1995 if (ci->platdata->notify_event) 1996 ci->platdata->notify_event(ci, 1997 CI_HDRC_CONTROLLER_STOPPED_EVENT); 1998 _gadget_stop_activity(&ci->gadget); 1999 spin_lock_irqsave(&ci->lock, flags); 2000 pm_runtime_put(ci->dev); 2001 } 2002 2003 spin_unlock_irqrestore(&ci->lock, flags); 2004 2005 ci_udc_stop_for_otg_fsm(ci); 2006 return 0; 2007} 2008 2009/****************************************************************************** 2010 * BUS block 2011 *****************************************************************************/ 2012/* 2013 * udc_irq: ci interrupt handler 2014 * 2015 * This function returns IRQ_HANDLED if the IRQ has been handled 2016 * It locks access to registers 2017 */ 2018static irqreturn_t udc_irq(struct ci_hdrc *ci) 2019{ 2020 irqreturn_t retval; 2021 u32 intr; 2022 2023 if (ci == NULL) 2024 return IRQ_HANDLED; 2025 2026 spin_lock(&ci->lock); 2027 2028 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) { 2029 if (hw_read(ci, OP_USBMODE, USBMODE_CM) != 2030 USBMODE_CM_DC) { 2031 spin_unlock(&ci->lock); 2032 return IRQ_NONE; 2033 } 2034 } 2035 intr = hw_test_and_clear_intr_active(ci); 2036 2037 if (intr) { 2038 /* order defines priority - do NOT change it */ 2039 if (USBi_URI & intr) 2040 isr_reset_handler(ci); 2041 2042 if (USBi_PCI & intr) { 2043 ci->gadget.speed = hw_port_is_high_speed(ci) ? 2044 USB_SPEED_HIGH : USB_SPEED_FULL; 2045 if (ci->usb_phy) 2046 usb_phy_set_event(ci->usb_phy, 2047 USB_EVENT_ENUMERATED); 2048 if (ci->suspended) { 2049 if (ci->driver->resume) { 2050 spin_unlock(&ci->lock); 2051 ci->driver->resume(&ci->gadget); 2052 spin_lock(&ci->lock); 2053 } 2054 ci->suspended = 0; 2055 usb_gadget_set_state(&ci->gadget, 2056 ci->resume_state); 2057 } 2058 } 2059 2060 if (USBi_UI & intr) 2061 isr_tr_complete_handler(ci); 2062 2063 if ((USBi_SLI & intr) && !(ci->suspended)) { 2064 ci->suspended = 1; 2065 ci->resume_state = ci->gadget.state; 2066 if (ci->gadget.speed != USB_SPEED_UNKNOWN && 2067 ci->driver->suspend) { 2068 spin_unlock(&ci->lock); 2069 ci->driver->suspend(&ci->gadget); 2070 spin_lock(&ci->lock); 2071 } 2072 usb_gadget_set_state(&ci->gadget, 2073 USB_STATE_SUSPENDED); 2074 } 2075 retval = IRQ_HANDLED; 2076 } else { 2077 retval = IRQ_NONE; 2078 } 2079 spin_unlock(&ci->lock); 2080 2081 return retval; 2082} 2083 2084/** 2085 * udc_start: initialize gadget role 2086 * @ci: chipidea controller 2087 */ 2088static int udc_start(struct ci_hdrc *ci) 2089{ 2090 struct device *dev = ci->dev; 2091 struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps; 2092 int retval = 0; 2093 2094 ci->gadget.ops = &usb_gadget_ops; 2095 ci->gadget.speed = USB_SPEED_UNKNOWN; 2096 ci->gadget.max_speed = USB_SPEED_HIGH; 2097 ci->gadget.name = ci->platdata->name; 2098 ci->gadget.otg_caps = otg_caps; 2099 ci->gadget.sg_supported = 1; 2100 ci->gadget.irq = ci->irq; 2101 2102 if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA) 2103 ci->gadget.quirk_avoids_skb_reserve = 1; 2104 2105 if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support || 2106 otg_caps->adp_support)) 2107 ci->gadget.is_otg = 1; 2108 2109 INIT_LIST_HEAD(&ci->gadget.ep_list); 2110 2111 /* alloc resources */ 2112 ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent, 2113 sizeof(struct ci_hw_qh), 2114 64, CI_HDRC_PAGE_SIZE); 2115 if (ci->qh_pool == NULL) 2116 return -ENOMEM; 2117 2118 ci->td_pool = dma_pool_create("ci_hw_td", dev->parent, 2119 sizeof(struct ci_hw_td), 2120 64, CI_HDRC_PAGE_SIZE); 2121 if (ci->td_pool == NULL) { 2122 retval = -ENOMEM; 2123 goto free_qh_pool; 2124 } 2125 2126 retval = init_eps(ci); 2127 if (retval) 2128 goto free_pools; 2129 2130 ci->gadget.ep0 = &ci->ep0in->ep; 2131 2132 retval = usb_add_gadget_udc(dev, &ci->gadget); 2133 if (retval) 2134 goto destroy_eps; 2135 2136 return retval; 2137 2138destroy_eps: 2139 destroy_eps(ci); 2140free_pools: 2141 dma_pool_destroy(ci->td_pool); 2142free_qh_pool: 2143 dma_pool_destroy(ci->qh_pool); 2144 return retval; 2145} 2146 2147/* 2148 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC 2149 * 2150 * No interrupts active, the IRQ has been released 2151 */ 2152void ci_hdrc_gadget_destroy(struct ci_hdrc *ci) 2153{ 2154 if (!ci->roles[CI_ROLE_GADGET]) 2155 return; 2156 2157 usb_del_gadget_udc(&ci->gadget); 2158 2159 destroy_eps(ci); 2160 2161 dma_pool_destroy(ci->td_pool); 2162 dma_pool_destroy(ci->qh_pool); 2163} 2164 2165static int udc_id_switch_for_device(struct ci_hdrc *ci) 2166{ 2167 if (ci->platdata->pins_device) 2168 pinctrl_select_state(ci->platdata->pctl, 2169 ci->platdata->pins_device); 2170 2171 if (ci->is_otg) 2172 /* Clear and enable BSV irq */ 2173 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE, 2174 OTGSC_BSVIS | OTGSC_BSVIE); 2175 2176 return 0; 2177} 2178 2179static void udc_id_switch_for_host(struct ci_hdrc *ci) 2180{ 2181 /* 2182 * host doesn't care B_SESSION_VALID event 2183 * so clear and disable BSV irq 2184 */ 2185 if (ci->is_otg) 2186 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS); 2187 2188 ci->vbus_active = 0; 2189 2190 if (ci->platdata->pins_device && ci->platdata->pins_default) 2191 pinctrl_select_state(ci->platdata->pctl, 2192 ci->platdata->pins_default); 2193} 2194 2195#ifdef CONFIG_PM_SLEEP 2196static void udc_suspend(struct ci_hdrc *ci) 2197{ 2198 /* 2199 * Set OP_ENDPTLISTADDR to be non-zero for 2200 * checking if controller resume from power lost 2201 * in non-host mode. 2202 */ 2203 if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0) 2204 hw_write(ci, OP_ENDPTLISTADDR, ~0, ~0); 2205} 2206 2207static void udc_resume(struct ci_hdrc *ci, bool power_lost) 2208{ 2209 if (power_lost) { 2210 if (ci->is_otg) 2211 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE, 2212 OTGSC_BSVIS | OTGSC_BSVIE); 2213 if (ci->vbus_active) 2214 usb_gadget_vbus_disconnect(&ci->gadget); 2215 } 2216 2217 /* Restore value 0 if it was set for power lost check */ 2218 if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0xFFFFFFFF) 2219 hw_write(ci, OP_ENDPTLISTADDR, ~0, 0); 2220} 2221#endif 2222 2223/** 2224 * ci_hdrc_gadget_init - initialize device related bits 2225 * @ci: the controller 2226 * 2227 * This function initializes the gadget, if the device is "device capable". 2228 */ 2229int ci_hdrc_gadget_init(struct ci_hdrc *ci) 2230{ 2231 struct ci_role_driver *rdrv; 2232 int ret; 2233 2234 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC)) 2235 return -ENXIO; 2236 2237 rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL); 2238 if (!rdrv) 2239 return -ENOMEM; 2240 2241 rdrv->start = udc_id_switch_for_device; 2242 rdrv->stop = udc_id_switch_for_host; 2243#ifdef CONFIG_PM_SLEEP 2244 rdrv->suspend = udc_suspend; 2245 rdrv->resume = udc_resume; 2246#endif 2247 rdrv->irq = udc_irq; 2248 rdrv->name = "gadget"; 2249 2250 ret = udc_start(ci); 2251 if (!ret) 2252 ci->roles[CI_ROLE_GADGET] = rdrv; 2253 2254 return ret; 2255} 2256