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.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 32 /* control endpoint description */ 33 static const struct usb_endpoint_descriptor 34 ctrl_endpt_out_desc = { 35 .bLength = USB_DT_ENDPOINT_SIZE, 36 .bDescriptorType = USB_DT_ENDPOINT, 37 38 .bEndpointAddress = USB_DIR_OUT, 39 .bmAttributes = USB_ENDPOINT_XFER_CONTROL, 40 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX), 41 }; 42 43 static const struct usb_endpoint_descriptor 44 ctrl_endpt_in_desc = { 45 .bLength = USB_DT_ENDPOINT_SIZE, 46 .bDescriptorType = USB_DT_ENDPOINT, 47 48 .bEndpointAddress = USB_DIR_IN, 49 .bmAttributes = USB_ENDPOINT_XFER_CONTROL, 50 .wMaxPacketSize = cpu_to_le16(CTRL_PAYLOAD_MAX), 51 }; 52 53 /** 54 * hw_ep_bit: calculates the bit number 55 * @num: endpoint number 56 * @dir: endpoint direction 57 * 58 * This function returns bit number 59 */ 60 static inline int hw_ep_bit(int num, int dir) 61 { 62 return num + (dir ? 16 : 0); 63 } 64 65 static inline int ep_to_bit(struct ci_hdrc *ci, int n) 66 { 67 int fill = 16 - ci->hw_ep_max / 2; 68 69 if (n >= ci->hw_ep_max / 2) 70 n += fill; 71 72 return n; 73 } 74 75 /** 76 * hw_device_state: enables/disables interrupts (execute without interruption) 77 * @dma: 0 => disable, !0 => enable and set dma engine 78 * 79 * This function returns an error code 80 */ 81 static int hw_device_state(struct ci_hdrc *ci, u32 dma) 82 { 83 if (dma) { 84 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma); 85 /* interrupt, error, port change, reset, sleep/suspend */ 86 hw_write(ci, OP_USBINTR, ~0, 87 USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI); 88 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS); 89 } else { 90 hw_write(ci, OP_USBINTR, ~0, 0); 91 hw_write(ci, OP_USBCMD, USBCMD_RS, 0); 92 } 93 return 0; 94 } 95 96 /** 97 * hw_ep_flush: flush endpoint fifo (execute without interruption) 98 * @num: endpoint number 99 * @dir: endpoint direction 100 * 101 * This function returns an error code 102 */ 103 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir) 104 { 105 int n = hw_ep_bit(num, dir); 106 107 do { 108 /* flush any pending transfer */ 109 hw_write(ci, OP_ENDPTFLUSH, BIT(n), BIT(n)); 110 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n))) 111 cpu_relax(); 112 } while (hw_read(ci, OP_ENDPTSTAT, BIT(n))); 113 114 return 0; 115 } 116 117 /** 118 * hw_ep_disable: disables endpoint (execute without interruption) 119 * @num: endpoint number 120 * @dir: endpoint direction 121 * 122 * This function returns an error code 123 */ 124 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir) 125 { 126 hw_ep_flush(ci, num, dir); 127 hw_write(ci, OP_ENDPTCTRL + num, 128 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0); 129 return 0; 130 } 131 132 /** 133 * hw_ep_enable: enables endpoint (execute without interruption) 134 * @num: endpoint number 135 * @dir: endpoint direction 136 * @type: endpoint type 137 * 138 * This function returns an error code 139 */ 140 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type) 141 { 142 u32 mask, data; 143 144 if (dir) { 145 mask = ENDPTCTRL_TXT; /* type */ 146 data = type << __ffs(mask); 147 148 mask |= ENDPTCTRL_TXS; /* unstall */ 149 mask |= ENDPTCTRL_TXR; /* reset data toggle */ 150 data |= ENDPTCTRL_TXR; 151 mask |= ENDPTCTRL_TXE; /* enable */ 152 data |= ENDPTCTRL_TXE; 153 } else { 154 mask = ENDPTCTRL_RXT; /* type */ 155 data = type << __ffs(mask); 156 157 mask |= ENDPTCTRL_RXS; /* unstall */ 158 mask |= ENDPTCTRL_RXR; /* reset data toggle */ 159 data |= ENDPTCTRL_RXR; 160 mask |= ENDPTCTRL_RXE; /* enable */ 161 data |= ENDPTCTRL_RXE; 162 } 163 hw_write(ci, OP_ENDPTCTRL + num, mask, data); 164 return 0; 165 } 166 167 /** 168 * hw_ep_get_halt: return endpoint halt status 169 * @num: endpoint number 170 * @dir: endpoint direction 171 * 172 * This function returns 1 if endpoint halted 173 */ 174 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir) 175 { 176 u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS; 177 178 return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0; 179 } 180 181 /** 182 * hw_test_and_clear_setup_status: test & clear setup status (execute without 183 * interruption) 184 * @n: endpoint number 185 * 186 * This function returns setup status 187 */ 188 static int hw_test_and_clear_setup_status(struct ci_hdrc *ci, int n) 189 { 190 n = ep_to_bit(ci, n); 191 return hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(n)); 192 } 193 194 /** 195 * hw_ep_prime: primes endpoint (execute without interruption) 196 * @num: endpoint number 197 * @dir: endpoint direction 198 * @is_ctrl: true if control endpoint 199 * 200 * This function returns an error code 201 */ 202 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl) 203 { 204 int n = hw_ep_bit(num, dir); 205 206 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num))) 207 return -EAGAIN; 208 209 hw_write(ci, OP_ENDPTPRIME, BIT(n), BIT(n)); 210 211 while (hw_read(ci, OP_ENDPTPRIME, BIT(n))) 212 cpu_relax(); 213 if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num))) 214 return -EAGAIN; 215 216 /* status shoult be tested according with manual but it doesn't work */ 217 return 0; 218 } 219 220 /** 221 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute 222 * without interruption) 223 * @num: endpoint number 224 * @dir: endpoint direction 225 * @value: true => stall, false => unstall 226 * 227 * This function returns an error code 228 */ 229 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value) 230 { 231 if (value != 0 && value != 1) 232 return -EINVAL; 233 234 do { 235 enum ci_hw_regs reg = OP_ENDPTCTRL + num; 236 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS; 237 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR; 238 239 /* data toggle - reserved for EP0 but it's in ESS */ 240 hw_write(ci, reg, mask_xs|mask_xr, 241 value ? mask_xs : mask_xr); 242 } while (value != hw_ep_get_halt(ci, num, dir)); 243 244 return 0; 245 } 246 247 /** 248 * hw_is_port_high_speed: test if port is high speed 249 * 250 * This function returns true if high speed port 251 */ 252 static int hw_port_is_high_speed(struct ci_hdrc *ci) 253 { 254 return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) : 255 hw_read(ci, OP_PORTSC, PORTSC_HSP); 256 } 257 258 /** 259 * hw_read_intr_enable: returns interrupt enable register 260 * 261 * This function returns register data 262 */ 263 static u32 hw_read_intr_enable(struct ci_hdrc *ci) 264 { 265 return hw_read(ci, OP_USBINTR, ~0); 266 } 267 268 /** 269 * hw_read_intr_status: returns interrupt status register 270 * 271 * This function returns register data 272 */ 273 static u32 hw_read_intr_status(struct ci_hdrc *ci) 274 { 275 return hw_read(ci, OP_USBSTS, ~0); 276 } 277 278 /** 279 * hw_test_and_clear_complete: test & clear complete status (execute without 280 * interruption) 281 * @n: endpoint number 282 * 283 * This function returns complete status 284 */ 285 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n) 286 { 287 n = ep_to_bit(ci, n); 288 return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n)); 289 } 290 291 /** 292 * hw_test_and_clear_intr_active: test & clear active interrupts (execute 293 * without interruption) 294 * 295 * This function returns active interrutps 296 */ 297 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci) 298 { 299 u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci); 300 301 hw_write(ci, OP_USBSTS, ~0, reg); 302 return reg; 303 } 304 305 /** 306 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without 307 * interruption) 308 * 309 * This function returns guard value 310 */ 311 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci) 312 { 313 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0); 314 } 315 316 /** 317 * hw_test_and_set_setup_guard: test & set setup guard (execute without 318 * interruption) 319 * 320 * This function returns guard value 321 */ 322 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci) 323 { 324 return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW); 325 } 326 327 /** 328 * hw_usb_set_address: configures USB address (execute without interruption) 329 * @value: new USB address 330 * 331 * This function explicitly sets the address, without the "USBADRA" (advance) 332 * feature, which is not supported by older versions of the controller. 333 */ 334 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value) 335 { 336 hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR, 337 value << __ffs(DEVICEADDR_USBADR)); 338 } 339 340 /** 341 * hw_usb_reset: restart device after a bus reset (execute without 342 * interruption) 343 * 344 * This function returns an error code 345 */ 346 static int hw_usb_reset(struct ci_hdrc *ci) 347 { 348 hw_usb_set_address(ci, 0); 349 350 /* ESS flushes only at end?!? */ 351 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0); 352 353 /* clear setup token semaphores */ 354 hw_write(ci, OP_ENDPTSETUPSTAT, 0, 0); 355 356 /* clear complete status */ 357 hw_write(ci, OP_ENDPTCOMPLETE, 0, 0); 358 359 /* wait until all bits cleared */ 360 while (hw_read(ci, OP_ENDPTPRIME, ~0)) 361 udelay(10); /* not RTOS friendly */ 362 363 /* reset all endpoints ? */ 364 365 /* reset internal status and wait for further instructions 366 no need to verify the port reset status (ESS does it) */ 367 368 return 0; 369 } 370 371 /****************************************************************************** 372 * UTIL block 373 *****************************************************************************/ 374 375 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq, 376 unsigned length) 377 { 378 int i; 379 u32 temp; 380 struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node), 381 GFP_ATOMIC); 382 383 if (node == NULL) 384 return -ENOMEM; 385 386 node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC, 387 &node->dma); 388 if (node->ptr == NULL) { 389 kfree(node); 390 return -ENOMEM; 391 } 392 393 memset(node->ptr, 0, sizeof(struct ci_hw_td)); 394 node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES)); 395 node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES); 396 node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE); 397 398 temp = (u32) (hwreq->req.dma + hwreq->req.actual); 399 if (length) { 400 node->ptr->page[0] = cpu_to_le32(temp); 401 for (i = 1; i < TD_PAGE_COUNT; i++) { 402 u32 page = temp + i * CI_HDRC_PAGE_SIZE; 403 page &= ~TD_RESERVED_MASK; 404 node->ptr->page[i] = cpu_to_le32(page); 405 } 406 } 407 408 hwreq->req.actual += length; 409 410 if (!list_empty(&hwreq->tds)) { 411 /* get the last entry */ 412 lastnode = list_entry(hwreq->tds.prev, 413 struct td_node, td); 414 lastnode->ptr->next = cpu_to_le32(node->dma); 415 } 416 417 INIT_LIST_HEAD(&node->td); 418 list_add_tail(&node->td, &hwreq->tds); 419 420 return 0; 421 } 422 423 /** 424 * _usb_addr: calculates endpoint address from direction & number 425 * @ep: endpoint 426 */ 427 static inline u8 _usb_addr(struct ci_hw_ep *ep) 428 { 429 return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num; 430 } 431 432 /** 433 * _hardware_queue: configures a request at hardware level 434 * @gadget: gadget 435 * @hwep: endpoint 436 * 437 * This function returns an error code 438 */ 439 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq) 440 { 441 struct ci_hdrc *ci = hwep->ci; 442 int ret = 0; 443 unsigned rest = hwreq->req.length; 444 int pages = TD_PAGE_COUNT; 445 struct td_node *firstnode, *lastnode; 446 447 /* don't queue twice */ 448 if (hwreq->req.status == -EALREADY) 449 return -EALREADY; 450 451 hwreq->req.status = -EALREADY; 452 453 ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir); 454 if (ret) 455 return ret; 456 457 /* 458 * The first buffer could be not page aligned. 459 * In that case we have to span into one extra td. 460 */ 461 if (hwreq->req.dma % PAGE_SIZE) 462 pages--; 463 464 if (rest == 0) 465 add_td_to_list(hwep, hwreq, 0); 466 467 while (rest > 0) { 468 unsigned count = min(hwreq->req.length - hwreq->req.actual, 469 (unsigned)(pages * CI_HDRC_PAGE_SIZE)); 470 add_td_to_list(hwep, hwreq, count); 471 rest -= count; 472 } 473 474 if (hwreq->req.zero && hwreq->req.length 475 && (hwreq->req.length % hwep->ep.maxpacket == 0)) 476 add_td_to_list(hwep, hwreq, 0); 477 478 firstnode = list_first_entry(&hwreq->tds, struct td_node, td); 479 480 lastnode = list_entry(hwreq->tds.prev, 481 struct td_node, td); 482 483 lastnode->ptr->next = cpu_to_le32(TD_TERMINATE); 484 if (!hwreq->req.no_interrupt) 485 lastnode->ptr->token |= cpu_to_le32(TD_IOC); 486 wmb(); 487 488 hwreq->req.actual = 0; 489 if (!list_empty(&hwep->qh.queue)) { 490 struct ci_hw_req *hwreqprev; 491 int n = hw_ep_bit(hwep->num, hwep->dir); 492 int tmp_stat; 493 struct td_node *prevlastnode; 494 u32 next = firstnode->dma & TD_ADDR_MASK; 495 496 hwreqprev = list_entry(hwep->qh.queue.prev, 497 struct ci_hw_req, queue); 498 prevlastnode = list_entry(hwreqprev->tds.prev, 499 struct td_node, td); 500 501 prevlastnode->ptr->next = cpu_to_le32(next); 502 wmb(); 503 if (hw_read(ci, OP_ENDPTPRIME, BIT(n))) 504 goto done; 505 do { 506 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW); 507 tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n)); 508 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW)); 509 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0); 510 if (tmp_stat) 511 goto done; 512 } 513 514 /* QH configuration */ 515 hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma); 516 hwep->qh.ptr->td.token &= 517 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE)); 518 519 if (hwep->type == USB_ENDPOINT_XFER_ISOC) { 520 u32 mul = hwreq->req.length / hwep->ep.maxpacket; 521 522 if (hwreq->req.length % hwep->ep.maxpacket) 523 mul++; 524 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT); 525 } 526 527 wmb(); /* synchronize before ep prime */ 528 529 ret = hw_ep_prime(ci, hwep->num, hwep->dir, 530 hwep->type == USB_ENDPOINT_XFER_CONTROL); 531 done: 532 return ret; 533 } 534 535 /* 536 * free_pending_td: remove a pending request for the endpoint 537 * @hwep: endpoint 538 */ 539 static void free_pending_td(struct ci_hw_ep *hwep) 540 { 541 struct td_node *pending = hwep->pending_td; 542 543 dma_pool_free(hwep->td_pool, pending->ptr, pending->dma); 544 hwep->pending_td = NULL; 545 kfree(pending); 546 } 547 548 /** 549 * _hardware_dequeue: handles a request at hardware level 550 * @gadget: gadget 551 * @hwep: endpoint 552 * 553 * This function returns an error code 554 */ 555 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq) 556 { 557 u32 tmptoken; 558 struct td_node *node, *tmpnode; 559 unsigned remaining_length; 560 unsigned actual = hwreq->req.length; 561 562 if (hwreq->req.status != -EALREADY) 563 return -EINVAL; 564 565 hwreq->req.status = 0; 566 567 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) { 568 tmptoken = le32_to_cpu(node->ptr->token); 569 if ((TD_STATUS_ACTIVE & tmptoken) != 0) { 570 hwreq->req.status = -EALREADY; 571 return -EBUSY; 572 } 573 574 remaining_length = (tmptoken & TD_TOTAL_BYTES); 575 remaining_length >>= __ffs(TD_TOTAL_BYTES); 576 actual -= remaining_length; 577 578 hwreq->req.status = tmptoken & TD_STATUS; 579 if ((TD_STATUS_HALTED & hwreq->req.status)) { 580 hwreq->req.status = -EPIPE; 581 break; 582 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) { 583 hwreq->req.status = -EPROTO; 584 break; 585 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) { 586 hwreq->req.status = -EILSEQ; 587 break; 588 } 589 590 if (remaining_length) { 591 if (hwep->dir) { 592 hwreq->req.status = -EPROTO; 593 break; 594 } 595 } 596 /* 597 * As the hardware could still address the freed td 598 * which will run the udc unusable, the cleanup of the 599 * td has to be delayed by one. 600 */ 601 if (hwep->pending_td) 602 free_pending_td(hwep); 603 604 hwep->pending_td = node; 605 list_del_init(&node->td); 606 } 607 608 usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir); 609 610 hwreq->req.actual += actual; 611 612 if (hwreq->req.status) 613 return hwreq->req.status; 614 615 return hwreq->req.actual; 616 } 617 618 /** 619 * _ep_nuke: dequeues all endpoint requests 620 * @hwep: endpoint 621 * 622 * This function returns an error code 623 * Caller must hold lock 624 */ 625 static int _ep_nuke(struct ci_hw_ep *hwep) 626 __releases(hwep->lock) 627 __acquires(hwep->lock) 628 { 629 struct td_node *node, *tmpnode; 630 if (hwep == NULL) 631 return -EINVAL; 632 633 hw_ep_flush(hwep->ci, hwep->num, hwep->dir); 634 635 while (!list_empty(&hwep->qh.queue)) { 636 637 /* pop oldest request */ 638 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next, 639 struct ci_hw_req, queue); 640 641 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) { 642 dma_pool_free(hwep->td_pool, node->ptr, node->dma); 643 list_del_init(&node->td); 644 node->ptr = NULL; 645 kfree(node); 646 } 647 648 list_del_init(&hwreq->queue); 649 hwreq->req.status = -ESHUTDOWN; 650 651 if (hwreq->req.complete != NULL) { 652 spin_unlock(hwep->lock); 653 hwreq->req.complete(&hwep->ep, &hwreq->req); 654 spin_lock(hwep->lock); 655 } 656 } 657 658 if (hwep->pending_td) 659 free_pending_td(hwep); 660 661 return 0; 662 } 663 664 /** 665 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts 666 * @gadget: gadget 667 * 668 * This function returns an error code 669 */ 670 static int _gadget_stop_activity(struct usb_gadget *gadget) 671 { 672 struct usb_ep *ep; 673 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget); 674 unsigned long flags; 675 676 spin_lock_irqsave(&ci->lock, flags); 677 ci->gadget.speed = USB_SPEED_UNKNOWN; 678 ci->remote_wakeup = 0; 679 ci->suspended = 0; 680 spin_unlock_irqrestore(&ci->lock, flags); 681 682 /* flush all endpoints */ 683 gadget_for_each_ep(ep, gadget) { 684 usb_ep_fifo_flush(ep); 685 } 686 usb_ep_fifo_flush(&ci->ep0out->ep); 687 usb_ep_fifo_flush(&ci->ep0in->ep); 688 689 if (ci->driver) 690 ci->driver->disconnect(gadget); 691 692 /* make sure to disable all endpoints */ 693 gadget_for_each_ep(ep, gadget) { 694 usb_ep_disable(ep); 695 } 696 697 if (ci->status != NULL) { 698 usb_ep_free_request(&ci->ep0in->ep, ci->status); 699 ci->status = NULL; 700 } 701 702 return 0; 703 } 704 705 /****************************************************************************** 706 * ISR block 707 *****************************************************************************/ 708 /** 709 * isr_reset_handler: USB reset interrupt handler 710 * @ci: UDC device 711 * 712 * This function resets USB engine after a bus reset occurred 713 */ 714 static void isr_reset_handler(struct ci_hdrc *ci) 715 __releases(ci->lock) 716 __acquires(ci->lock) 717 { 718 int retval; 719 720 spin_unlock(&ci->lock); 721 retval = _gadget_stop_activity(&ci->gadget); 722 if (retval) 723 goto done; 724 725 retval = hw_usb_reset(ci); 726 if (retval) 727 goto done; 728 729 ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC); 730 if (ci->status == NULL) 731 retval = -ENOMEM; 732 733 done: 734 spin_lock(&ci->lock); 735 736 if (retval) 737 dev_err(ci->dev, "error: %i\n", retval); 738 } 739 740 /** 741 * isr_get_status_complete: get_status request complete function 742 * @ep: endpoint 743 * @req: request handled 744 * 745 * Caller must release lock 746 */ 747 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req) 748 { 749 if (ep == NULL || req == NULL) 750 return; 751 752 kfree(req->buf); 753 usb_ep_free_request(ep, req); 754 } 755 756 /** 757 * _ep_queue: queues (submits) an I/O request to an endpoint 758 * 759 * Caller must hold lock 760 */ 761 static int _ep_queue(struct usb_ep *ep, struct usb_request *req, 762 gfp_t __maybe_unused gfp_flags) 763 { 764 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 765 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req); 766 struct ci_hdrc *ci = hwep->ci; 767 int retval = 0; 768 769 if (ep == NULL || req == NULL || hwep->ep.desc == NULL) 770 return -EINVAL; 771 772 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) { 773 if (req->length) 774 hwep = (ci->ep0_dir == RX) ? 775 ci->ep0out : ci->ep0in; 776 if (!list_empty(&hwep->qh.queue)) { 777 _ep_nuke(hwep); 778 retval = -EOVERFLOW; 779 dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n", 780 _usb_addr(hwep)); 781 } 782 } 783 784 if (usb_endpoint_xfer_isoc(hwep->ep.desc) && 785 hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) { 786 dev_err(hwep->ci->dev, "request length too big for isochronous\n"); 787 return -EMSGSIZE; 788 } 789 790 /* first nuke then test link, e.g. previous status has not sent */ 791 if (!list_empty(&hwreq->queue)) { 792 dev_err(hwep->ci->dev, "request already in queue\n"); 793 return -EBUSY; 794 } 795 796 /* push request */ 797 hwreq->req.status = -EINPROGRESS; 798 hwreq->req.actual = 0; 799 800 retval = _hardware_enqueue(hwep, hwreq); 801 802 if (retval == -EALREADY) 803 retval = 0; 804 if (!retval) 805 list_add_tail(&hwreq->queue, &hwep->qh.queue); 806 807 return retval; 808 } 809 810 /** 811 * isr_get_status_response: get_status request response 812 * @ci: ci struct 813 * @setup: setup request packet 814 * 815 * This function returns an error code 816 */ 817 static int isr_get_status_response(struct ci_hdrc *ci, 818 struct usb_ctrlrequest *setup) 819 __releases(hwep->lock) 820 __acquires(hwep->lock) 821 { 822 struct ci_hw_ep *hwep = ci->ep0in; 823 struct usb_request *req = NULL; 824 gfp_t gfp_flags = GFP_ATOMIC; 825 int dir, num, retval; 826 827 if (hwep == NULL || setup == NULL) 828 return -EINVAL; 829 830 spin_unlock(hwep->lock); 831 req = usb_ep_alloc_request(&hwep->ep, gfp_flags); 832 spin_lock(hwep->lock); 833 if (req == NULL) 834 return -ENOMEM; 835 836 req->complete = isr_get_status_complete; 837 req->length = 2; 838 req->buf = kzalloc(req->length, gfp_flags); 839 if (req->buf == NULL) { 840 retval = -ENOMEM; 841 goto err_free_req; 842 } 843 844 if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) { 845 /* Assume that device is bus powered for now. */ 846 *(u16 *)req->buf = ci->remote_wakeup << 1; 847 retval = 0; 848 } else if ((setup->bRequestType & USB_RECIP_MASK) \ 849 == USB_RECIP_ENDPOINT) { 850 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ? 851 TX : RX; 852 num = le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK; 853 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir); 854 } 855 /* else do nothing; reserved for future use */ 856 857 retval = _ep_queue(&hwep->ep, req, gfp_flags); 858 if (retval) 859 goto err_free_buf; 860 861 return 0; 862 863 err_free_buf: 864 kfree(req->buf); 865 err_free_req: 866 spin_unlock(hwep->lock); 867 usb_ep_free_request(&hwep->ep, req); 868 spin_lock(hwep->lock); 869 return retval; 870 } 871 872 /** 873 * isr_setup_status_complete: setup_status request complete function 874 * @ep: endpoint 875 * @req: request handled 876 * 877 * Caller must release lock. Put the port in test mode if test mode 878 * feature is selected. 879 */ 880 static void 881 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req) 882 { 883 struct ci_hdrc *ci = req->context; 884 unsigned long flags; 885 886 if (ci->setaddr) { 887 hw_usb_set_address(ci, ci->address); 888 ci->setaddr = false; 889 } 890 891 spin_lock_irqsave(&ci->lock, flags); 892 if (ci->test_mode) 893 hw_port_test_set(ci, ci->test_mode); 894 spin_unlock_irqrestore(&ci->lock, flags); 895 } 896 897 /** 898 * isr_setup_status_phase: queues the status phase of a setup transation 899 * @ci: ci struct 900 * 901 * This function returns an error code 902 */ 903 static int isr_setup_status_phase(struct ci_hdrc *ci) 904 { 905 int retval; 906 struct ci_hw_ep *hwep; 907 908 hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in; 909 ci->status->context = ci; 910 ci->status->complete = isr_setup_status_complete; 911 912 retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC); 913 914 return retval; 915 } 916 917 /** 918 * isr_tr_complete_low: transaction complete low level handler 919 * @hwep: endpoint 920 * 921 * This function returns an error code 922 * Caller must hold lock 923 */ 924 static int isr_tr_complete_low(struct ci_hw_ep *hwep) 925 __releases(hwep->lock) 926 __acquires(hwep->lock) 927 { 928 struct ci_hw_req *hwreq, *hwreqtemp; 929 struct ci_hw_ep *hweptemp = hwep; 930 int retval = 0; 931 932 list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue, 933 queue) { 934 retval = _hardware_dequeue(hwep, hwreq); 935 if (retval < 0) 936 break; 937 list_del_init(&hwreq->queue); 938 if (hwreq->req.complete != NULL) { 939 spin_unlock(hwep->lock); 940 if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) && 941 hwreq->req.length) 942 hweptemp = hwep->ci->ep0in; 943 hwreq->req.complete(&hweptemp->ep, &hwreq->req); 944 spin_lock(hwep->lock); 945 } 946 } 947 948 if (retval == -EBUSY) 949 retval = 0; 950 951 return retval; 952 } 953 954 /** 955 * isr_tr_complete_handler: transaction complete interrupt handler 956 * @ci: UDC descriptor 957 * 958 * This function handles traffic events 959 */ 960 static void isr_tr_complete_handler(struct ci_hdrc *ci) 961 __releases(ci->lock) 962 __acquires(ci->lock) 963 { 964 unsigned i; 965 u8 tmode = 0; 966 967 for (i = 0; i < ci->hw_ep_max; i++) { 968 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i]; 969 int type, num, dir, err = -EINVAL; 970 struct usb_ctrlrequest req; 971 972 if (hwep->ep.desc == NULL) 973 continue; /* not configured */ 974 975 if (hw_test_and_clear_complete(ci, i)) { 976 err = isr_tr_complete_low(hwep); 977 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) { 978 if (err > 0) /* needs status phase */ 979 err = isr_setup_status_phase(ci); 980 if (err < 0) { 981 spin_unlock(&ci->lock); 982 if (usb_ep_set_halt(&hwep->ep)) 983 dev_err(ci->dev, 984 "error: ep_set_halt\n"); 985 spin_lock(&ci->lock); 986 } 987 } 988 } 989 990 if (hwep->type != USB_ENDPOINT_XFER_CONTROL || 991 !hw_test_and_clear_setup_status(ci, i)) 992 continue; 993 994 if (i != 0) { 995 dev_warn(ci->dev, "ctrl traffic at endpoint %d\n", i); 996 continue; 997 } 998 999 /* 1000 * Flush data and handshake transactions of previous 1001 * setup packet. 1002 */ 1003 _ep_nuke(ci->ep0out); 1004 _ep_nuke(ci->ep0in); 1005 1006 /* read_setup_packet */ 1007 do { 1008 hw_test_and_set_setup_guard(ci); 1009 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req)); 1010 } while (!hw_test_and_clear_setup_guard(ci)); 1011 1012 type = req.bRequestType; 1013 1014 ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX; 1015 1016 switch (req.bRequest) { 1017 case USB_REQ_CLEAR_FEATURE: 1018 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) && 1019 le16_to_cpu(req.wValue) == 1020 USB_ENDPOINT_HALT) { 1021 if (req.wLength != 0) 1022 break; 1023 num = le16_to_cpu(req.wIndex); 1024 dir = num & USB_ENDPOINT_DIR_MASK; 1025 num &= USB_ENDPOINT_NUMBER_MASK; 1026 if (dir) /* TX */ 1027 num += ci->hw_ep_max/2; 1028 if (!ci->ci_hw_ep[num].wedge) { 1029 spin_unlock(&ci->lock); 1030 err = usb_ep_clear_halt( 1031 &ci->ci_hw_ep[num].ep); 1032 spin_lock(&ci->lock); 1033 if (err) 1034 break; 1035 } 1036 err = isr_setup_status_phase(ci); 1037 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) && 1038 le16_to_cpu(req.wValue) == 1039 USB_DEVICE_REMOTE_WAKEUP) { 1040 if (req.wLength != 0) 1041 break; 1042 ci->remote_wakeup = 0; 1043 err = isr_setup_status_phase(ci); 1044 } else { 1045 goto delegate; 1046 } 1047 break; 1048 case USB_REQ_GET_STATUS: 1049 if (type != (USB_DIR_IN|USB_RECIP_DEVICE) && 1050 type != (USB_DIR_IN|USB_RECIP_ENDPOINT) && 1051 type != (USB_DIR_IN|USB_RECIP_INTERFACE)) 1052 goto delegate; 1053 if (le16_to_cpu(req.wLength) != 2 || 1054 le16_to_cpu(req.wValue) != 0) 1055 break; 1056 err = isr_get_status_response(ci, &req); 1057 break; 1058 case USB_REQ_SET_ADDRESS: 1059 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE)) 1060 goto delegate; 1061 if (le16_to_cpu(req.wLength) != 0 || 1062 le16_to_cpu(req.wIndex) != 0) 1063 break; 1064 ci->address = (u8)le16_to_cpu(req.wValue); 1065 ci->setaddr = true; 1066 err = isr_setup_status_phase(ci); 1067 break; 1068 case USB_REQ_SET_FEATURE: 1069 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) && 1070 le16_to_cpu(req.wValue) == 1071 USB_ENDPOINT_HALT) { 1072 if (req.wLength != 0) 1073 break; 1074 num = le16_to_cpu(req.wIndex); 1075 dir = num & USB_ENDPOINT_DIR_MASK; 1076 num &= USB_ENDPOINT_NUMBER_MASK; 1077 if (dir) /* TX */ 1078 num += ci->hw_ep_max/2; 1079 1080 spin_unlock(&ci->lock); 1081 err = usb_ep_set_halt(&ci->ci_hw_ep[num].ep); 1082 spin_lock(&ci->lock); 1083 if (!err) 1084 isr_setup_status_phase(ci); 1085 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) { 1086 if (req.wLength != 0) 1087 break; 1088 switch (le16_to_cpu(req.wValue)) { 1089 case USB_DEVICE_REMOTE_WAKEUP: 1090 ci->remote_wakeup = 1; 1091 err = isr_setup_status_phase(ci); 1092 break; 1093 case USB_DEVICE_TEST_MODE: 1094 tmode = le16_to_cpu(req.wIndex) >> 8; 1095 switch (tmode) { 1096 case TEST_J: 1097 case TEST_K: 1098 case TEST_SE0_NAK: 1099 case TEST_PACKET: 1100 case TEST_FORCE_EN: 1101 ci->test_mode = tmode; 1102 err = isr_setup_status_phase( 1103 ci); 1104 break; 1105 default: 1106 break; 1107 } 1108 default: 1109 goto delegate; 1110 } 1111 } else { 1112 goto delegate; 1113 } 1114 break; 1115 default: 1116 delegate: 1117 if (req.wLength == 0) /* no data phase */ 1118 ci->ep0_dir = TX; 1119 1120 spin_unlock(&ci->lock); 1121 err = ci->driver->setup(&ci->gadget, &req); 1122 spin_lock(&ci->lock); 1123 break; 1124 } 1125 1126 if (err < 0) { 1127 spin_unlock(&ci->lock); 1128 if (usb_ep_set_halt(&hwep->ep)) 1129 dev_err(ci->dev, "error: ep_set_halt\n"); 1130 spin_lock(&ci->lock); 1131 } 1132 } 1133 } 1134 1135 /****************************************************************************** 1136 * ENDPT block 1137 *****************************************************************************/ 1138 /** 1139 * ep_enable: configure endpoint, making it usable 1140 * 1141 * Check usb_ep_enable() at "usb_gadget.h" for details 1142 */ 1143 static int ep_enable(struct usb_ep *ep, 1144 const struct usb_endpoint_descriptor *desc) 1145 { 1146 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1147 int retval = 0; 1148 unsigned long flags; 1149 u32 cap = 0; 1150 1151 if (ep == NULL || desc == NULL) 1152 return -EINVAL; 1153 1154 spin_lock_irqsave(hwep->lock, flags); 1155 1156 /* only internal SW should enable ctrl endpts */ 1157 1158 hwep->ep.desc = desc; 1159 1160 if (!list_empty(&hwep->qh.queue)) 1161 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n"); 1162 1163 hwep->dir = usb_endpoint_dir_in(desc) ? TX : RX; 1164 hwep->num = usb_endpoint_num(desc); 1165 hwep->type = usb_endpoint_type(desc); 1166 1167 hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff; 1168 hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc)); 1169 1170 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) 1171 cap |= QH_IOS; 1172 if (hwep->num) 1173 cap |= QH_ZLT; 1174 cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT; 1175 1176 hwep->qh.ptr->cap = cpu_to_le32(cap); 1177 1178 hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE); /* needed? */ 1179 1180 /* 1181 * Enable endpoints in the HW other than ep0 as ep0 1182 * is always enabled 1183 */ 1184 if (hwep->num) 1185 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir, 1186 hwep->type); 1187 1188 spin_unlock_irqrestore(hwep->lock, flags); 1189 return retval; 1190 } 1191 1192 /** 1193 * ep_disable: endpoint is no longer usable 1194 * 1195 * Check usb_ep_disable() at "usb_gadget.h" for details 1196 */ 1197 static int ep_disable(struct usb_ep *ep) 1198 { 1199 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1200 int direction, retval = 0; 1201 unsigned long flags; 1202 1203 if (ep == NULL) 1204 return -EINVAL; 1205 else if (hwep->ep.desc == NULL) 1206 return -EBUSY; 1207 1208 spin_lock_irqsave(hwep->lock, flags); 1209 1210 /* only internal SW should disable ctrl endpts */ 1211 1212 direction = hwep->dir; 1213 do { 1214 retval |= _ep_nuke(hwep); 1215 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir); 1216 1217 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) 1218 hwep->dir = (hwep->dir == TX) ? RX : TX; 1219 1220 } while (hwep->dir != direction); 1221 1222 hwep->ep.desc = NULL; 1223 1224 spin_unlock_irqrestore(hwep->lock, flags); 1225 return retval; 1226 } 1227 1228 /** 1229 * ep_alloc_request: allocate a request object to use with this endpoint 1230 * 1231 * Check usb_ep_alloc_request() at "usb_gadget.h" for details 1232 */ 1233 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags) 1234 { 1235 struct ci_hw_req *hwreq = NULL; 1236 1237 if (ep == NULL) 1238 return NULL; 1239 1240 hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags); 1241 if (hwreq != NULL) { 1242 INIT_LIST_HEAD(&hwreq->queue); 1243 INIT_LIST_HEAD(&hwreq->tds); 1244 } 1245 1246 return (hwreq == NULL) ? NULL : &hwreq->req; 1247 } 1248 1249 /** 1250 * ep_free_request: frees a request object 1251 * 1252 * Check usb_ep_free_request() at "usb_gadget.h" for details 1253 */ 1254 static void ep_free_request(struct usb_ep *ep, struct usb_request *req) 1255 { 1256 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1257 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req); 1258 struct td_node *node, *tmpnode; 1259 unsigned long flags; 1260 1261 if (ep == NULL || req == NULL) { 1262 return; 1263 } else if (!list_empty(&hwreq->queue)) { 1264 dev_err(hwep->ci->dev, "freeing queued request\n"); 1265 return; 1266 } 1267 1268 spin_lock_irqsave(hwep->lock, flags); 1269 1270 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) { 1271 dma_pool_free(hwep->td_pool, node->ptr, node->dma); 1272 list_del_init(&node->td); 1273 node->ptr = NULL; 1274 kfree(node); 1275 } 1276 1277 kfree(hwreq); 1278 1279 spin_unlock_irqrestore(hwep->lock, flags); 1280 } 1281 1282 /** 1283 * ep_queue: queues (submits) an I/O request to an endpoint 1284 * 1285 * Check usb_ep_queue()* at usb_gadget.h" for details 1286 */ 1287 static int ep_queue(struct usb_ep *ep, struct usb_request *req, 1288 gfp_t __maybe_unused gfp_flags) 1289 { 1290 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1291 int retval = 0; 1292 unsigned long flags; 1293 1294 if (ep == NULL || req == NULL || hwep->ep.desc == NULL) 1295 return -EINVAL; 1296 1297 spin_lock_irqsave(hwep->lock, flags); 1298 retval = _ep_queue(ep, req, gfp_flags); 1299 spin_unlock_irqrestore(hwep->lock, flags); 1300 return retval; 1301 } 1302 1303 /** 1304 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint 1305 * 1306 * Check usb_ep_dequeue() at "usb_gadget.h" for details 1307 */ 1308 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req) 1309 { 1310 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1311 struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req); 1312 unsigned long flags; 1313 1314 if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY || 1315 hwep->ep.desc == NULL || list_empty(&hwreq->queue) || 1316 list_empty(&hwep->qh.queue)) 1317 return -EINVAL; 1318 1319 spin_lock_irqsave(hwep->lock, flags); 1320 1321 hw_ep_flush(hwep->ci, hwep->num, hwep->dir); 1322 1323 /* pop request */ 1324 list_del_init(&hwreq->queue); 1325 1326 usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir); 1327 1328 req->status = -ECONNRESET; 1329 1330 if (hwreq->req.complete != NULL) { 1331 spin_unlock(hwep->lock); 1332 hwreq->req.complete(&hwep->ep, &hwreq->req); 1333 spin_lock(hwep->lock); 1334 } 1335 1336 spin_unlock_irqrestore(hwep->lock, flags); 1337 return 0; 1338 } 1339 1340 /** 1341 * ep_set_halt: sets the endpoint halt feature 1342 * 1343 * Check usb_ep_set_halt() at "usb_gadget.h" for details 1344 */ 1345 static int ep_set_halt(struct usb_ep *ep, int value) 1346 { 1347 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1348 int direction, retval = 0; 1349 unsigned long flags; 1350 1351 if (ep == NULL || hwep->ep.desc == NULL) 1352 return -EINVAL; 1353 1354 if (usb_endpoint_xfer_isoc(hwep->ep.desc)) 1355 return -EOPNOTSUPP; 1356 1357 spin_lock_irqsave(hwep->lock, flags); 1358 1359 #ifndef STALL_IN 1360 /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */ 1361 if (value && hwep->type == USB_ENDPOINT_XFER_BULK && hwep->dir == TX && 1362 !list_empty(&hwep->qh.queue)) { 1363 spin_unlock_irqrestore(hwep->lock, flags); 1364 return -EAGAIN; 1365 } 1366 #endif 1367 1368 direction = hwep->dir; 1369 do { 1370 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value); 1371 1372 if (!value) 1373 hwep->wedge = 0; 1374 1375 if (hwep->type == USB_ENDPOINT_XFER_CONTROL) 1376 hwep->dir = (hwep->dir == TX) ? RX : TX; 1377 1378 } while (hwep->dir != direction); 1379 1380 spin_unlock_irqrestore(hwep->lock, flags); 1381 return retval; 1382 } 1383 1384 /** 1385 * ep_set_wedge: sets the halt feature and ignores clear requests 1386 * 1387 * Check usb_ep_set_wedge() at "usb_gadget.h" for details 1388 */ 1389 static int ep_set_wedge(struct usb_ep *ep) 1390 { 1391 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1392 unsigned long flags; 1393 1394 if (ep == NULL || hwep->ep.desc == NULL) 1395 return -EINVAL; 1396 1397 spin_lock_irqsave(hwep->lock, flags); 1398 hwep->wedge = 1; 1399 spin_unlock_irqrestore(hwep->lock, flags); 1400 1401 return usb_ep_set_halt(ep); 1402 } 1403 1404 /** 1405 * ep_fifo_flush: flushes contents of a fifo 1406 * 1407 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details 1408 */ 1409 static void ep_fifo_flush(struct usb_ep *ep) 1410 { 1411 struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep); 1412 unsigned long flags; 1413 1414 if (ep == NULL) { 1415 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep)); 1416 return; 1417 } 1418 1419 spin_lock_irqsave(hwep->lock, flags); 1420 1421 hw_ep_flush(hwep->ci, hwep->num, hwep->dir); 1422 1423 spin_unlock_irqrestore(hwep->lock, flags); 1424 } 1425 1426 /** 1427 * Endpoint-specific part of the API to the USB controller hardware 1428 * Check "usb_gadget.h" for details 1429 */ 1430 static const struct usb_ep_ops usb_ep_ops = { 1431 .enable = ep_enable, 1432 .disable = ep_disable, 1433 .alloc_request = ep_alloc_request, 1434 .free_request = ep_free_request, 1435 .queue = ep_queue, 1436 .dequeue = ep_dequeue, 1437 .set_halt = ep_set_halt, 1438 .set_wedge = ep_set_wedge, 1439 .fifo_flush = ep_fifo_flush, 1440 }; 1441 1442 /****************************************************************************** 1443 * GADGET block 1444 *****************************************************************************/ 1445 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active) 1446 { 1447 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1448 unsigned long flags; 1449 int gadget_ready = 0; 1450 1451 spin_lock_irqsave(&ci->lock, flags); 1452 ci->vbus_active = is_active; 1453 if (ci->driver) 1454 gadget_ready = 1; 1455 spin_unlock_irqrestore(&ci->lock, flags); 1456 1457 if (gadget_ready) { 1458 if (is_active) { 1459 pm_runtime_get_sync(&_gadget->dev); 1460 hw_device_reset(ci, USBMODE_CM_DC); 1461 hw_device_state(ci, ci->ep0out->qh.dma); 1462 dev_dbg(ci->dev, "Connected to host\n"); 1463 } else { 1464 hw_device_state(ci, 0); 1465 if (ci->platdata->notify_event) 1466 ci->platdata->notify_event(ci, 1467 CI_HDRC_CONTROLLER_STOPPED_EVENT); 1468 _gadget_stop_activity(&ci->gadget); 1469 pm_runtime_put_sync(&_gadget->dev); 1470 dev_dbg(ci->dev, "Disconnected from host\n"); 1471 } 1472 } 1473 1474 return 0; 1475 } 1476 1477 static int ci_udc_wakeup(struct usb_gadget *_gadget) 1478 { 1479 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1480 unsigned long flags; 1481 int ret = 0; 1482 1483 spin_lock_irqsave(&ci->lock, flags); 1484 if (!ci->remote_wakeup) { 1485 ret = -EOPNOTSUPP; 1486 goto out; 1487 } 1488 if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) { 1489 ret = -EINVAL; 1490 goto out; 1491 } 1492 hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR); 1493 out: 1494 spin_unlock_irqrestore(&ci->lock, flags); 1495 return ret; 1496 } 1497 1498 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma) 1499 { 1500 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1501 1502 if (ci->transceiver) 1503 return usb_phy_set_power(ci->transceiver, ma); 1504 return -ENOTSUPP; 1505 } 1506 1507 /* Change Data+ pullup status 1508 * this func is used by usb_gadget_connect/disconnet 1509 */ 1510 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on) 1511 { 1512 struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget); 1513 1514 if (!ci->vbus_active) 1515 return -EOPNOTSUPP; 1516 1517 if (is_on) 1518 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS); 1519 else 1520 hw_write(ci, OP_USBCMD, USBCMD_RS, 0); 1521 1522 return 0; 1523 } 1524 1525 static int ci_udc_start(struct usb_gadget *gadget, 1526 struct usb_gadget_driver *driver); 1527 static int ci_udc_stop(struct usb_gadget *gadget, 1528 struct usb_gadget_driver *driver); 1529 /** 1530 * Device operations part of the API to the USB controller hardware, 1531 * which don't involve endpoints (or i/o) 1532 * Check "usb_gadget.h" for details 1533 */ 1534 static const struct usb_gadget_ops usb_gadget_ops = { 1535 .vbus_session = ci_udc_vbus_session, 1536 .wakeup = ci_udc_wakeup, 1537 .pullup = ci_udc_pullup, 1538 .vbus_draw = ci_udc_vbus_draw, 1539 .udc_start = ci_udc_start, 1540 .udc_stop = ci_udc_stop, 1541 }; 1542 1543 static int init_eps(struct ci_hdrc *ci) 1544 { 1545 int retval = 0, i, j; 1546 1547 for (i = 0; i < ci->hw_ep_max/2; i++) 1548 for (j = RX; j <= TX; j++) { 1549 int k = i + j * ci->hw_ep_max/2; 1550 struct ci_hw_ep *hwep = &ci->ci_hw_ep[k]; 1551 1552 scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i, 1553 (j == TX) ? "in" : "out"); 1554 1555 hwep->ci = ci; 1556 hwep->lock = &ci->lock; 1557 hwep->td_pool = ci->td_pool; 1558 1559 hwep->ep.name = hwep->name; 1560 hwep->ep.ops = &usb_ep_ops; 1561 /* 1562 * for ep0: maxP defined in desc, for other 1563 * eps, maxP is set by epautoconfig() called 1564 * by gadget layer 1565 */ 1566 hwep->ep.maxpacket = (unsigned short)~0; 1567 1568 INIT_LIST_HEAD(&hwep->qh.queue); 1569 hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL, 1570 &hwep->qh.dma); 1571 if (hwep->qh.ptr == NULL) 1572 retval = -ENOMEM; 1573 else 1574 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr)); 1575 1576 /* 1577 * set up shorthands for ep0 out and in endpoints, 1578 * don't add to gadget's ep_list 1579 */ 1580 if (i == 0) { 1581 if (j == RX) 1582 ci->ep0out = hwep; 1583 else 1584 ci->ep0in = hwep; 1585 1586 hwep->ep.maxpacket = CTRL_PAYLOAD_MAX; 1587 continue; 1588 } 1589 1590 list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list); 1591 } 1592 1593 return retval; 1594 } 1595 1596 static void destroy_eps(struct ci_hdrc *ci) 1597 { 1598 int i; 1599 1600 for (i = 0; i < ci->hw_ep_max; i++) { 1601 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i]; 1602 1603 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma); 1604 } 1605 } 1606 1607 /** 1608 * ci_udc_start: register a gadget driver 1609 * @gadget: our gadget 1610 * @driver: the driver being registered 1611 * 1612 * Interrupts are enabled here. 1613 */ 1614 static int ci_udc_start(struct usb_gadget *gadget, 1615 struct usb_gadget_driver *driver) 1616 { 1617 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget); 1618 unsigned long flags; 1619 int retval = -ENOMEM; 1620 1621 if (driver->disconnect == NULL) 1622 return -EINVAL; 1623 1624 1625 ci->ep0out->ep.desc = &ctrl_endpt_out_desc; 1626 retval = usb_ep_enable(&ci->ep0out->ep); 1627 if (retval) 1628 return retval; 1629 1630 ci->ep0in->ep.desc = &ctrl_endpt_in_desc; 1631 retval = usb_ep_enable(&ci->ep0in->ep); 1632 if (retval) 1633 return retval; 1634 spin_lock_irqsave(&ci->lock, flags); 1635 1636 ci->driver = driver; 1637 pm_runtime_get_sync(&ci->gadget.dev); 1638 if (ci->vbus_active) { 1639 hw_device_reset(ci, USBMODE_CM_DC); 1640 } else { 1641 pm_runtime_put_sync(&ci->gadget.dev); 1642 goto done; 1643 } 1644 1645 retval = hw_device_state(ci, ci->ep0out->qh.dma); 1646 if (retval) 1647 pm_runtime_put_sync(&ci->gadget.dev); 1648 1649 done: 1650 spin_unlock_irqrestore(&ci->lock, flags); 1651 return retval; 1652 } 1653 1654 /** 1655 * ci_udc_stop: unregister a gadget driver 1656 */ 1657 static int ci_udc_stop(struct usb_gadget *gadget, 1658 struct usb_gadget_driver *driver) 1659 { 1660 struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget); 1661 unsigned long flags; 1662 1663 spin_lock_irqsave(&ci->lock, flags); 1664 1665 if (ci->vbus_active) { 1666 hw_device_state(ci, 0); 1667 if (ci->platdata->notify_event) 1668 ci->platdata->notify_event(ci, 1669 CI_HDRC_CONTROLLER_STOPPED_EVENT); 1670 ci->driver = NULL; 1671 spin_unlock_irqrestore(&ci->lock, flags); 1672 _gadget_stop_activity(&ci->gadget); 1673 spin_lock_irqsave(&ci->lock, flags); 1674 pm_runtime_put(&ci->gadget.dev); 1675 } 1676 1677 spin_unlock_irqrestore(&ci->lock, flags); 1678 1679 return 0; 1680 } 1681 1682 /****************************************************************************** 1683 * BUS block 1684 *****************************************************************************/ 1685 /** 1686 * udc_irq: ci interrupt handler 1687 * 1688 * This function returns IRQ_HANDLED if the IRQ has been handled 1689 * It locks access to registers 1690 */ 1691 static irqreturn_t udc_irq(struct ci_hdrc *ci) 1692 { 1693 irqreturn_t retval; 1694 u32 intr; 1695 1696 if (ci == NULL) 1697 return IRQ_HANDLED; 1698 1699 spin_lock(&ci->lock); 1700 1701 if (ci->platdata->flags & CI_HDRC_REGS_SHARED) { 1702 if (hw_read(ci, OP_USBMODE, USBMODE_CM) != 1703 USBMODE_CM_DC) { 1704 spin_unlock(&ci->lock); 1705 return IRQ_NONE; 1706 } 1707 } 1708 intr = hw_test_and_clear_intr_active(ci); 1709 1710 if (intr) { 1711 /* order defines priority - do NOT change it */ 1712 if (USBi_URI & intr) 1713 isr_reset_handler(ci); 1714 1715 if (USBi_PCI & intr) { 1716 ci->gadget.speed = hw_port_is_high_speed(ci) ? 1717 USB_SPEED_HIGH : USB_SPEED_FULL; 1718 if (ci->suspended && ci->driver->resume) { 1719 spin_unlock(&ci->lock); 1720 ci->driver->resume(&ci->gadget); 1721 spin_lock(&ci->lock); 1722 ci->suspended = 0; 1723 } 1724 } 1725 1726 if (USBi_UI & intr) 1727 isr_tr_complete_handler(ci); 1728 1729 if (USBi_SLI & intr) { 1730 if (ci->gadget.speed != USB_SPEED_UNKNOWN && 1731 ci->driver->suspend) { 1732 ci->suspended = 1; 1733 spin_unlock(&ci->lock); 1734 ci->driver->suspend(&ci->gadget); 1735 spin_lock(&ci->lock); 1736 } 1737 } 1738 retval = IRQ_HANDLED; 1739 } else { 1740 retval = IRQ_NONE; 1741 } 1742 spin_unlock(&ci->lock); 1743 1744 return retval; 1745 } 1746 1747 /** 1748 * udc_start: initialize gadget role 1749 * @ci: chipidea controller 1750 */ 1751 static int udc_start(struct ci_hdrc *ci) 1752 { 1753 struct device *dev = ci->dev; 1754 int retval = 0; 1755 1756 spin_lock_init(&ci->lock); 1757 1758 ci->gadget.ops = &usb_gadget_ops; 1759 ci->gadget.speed = USB_SPEED_UNKNOWN; 1760 ci->gadget.max_speed = USB_SPEED_HIGH; 1761 ci->gadget.is_otg = 0; 1762 ci->gadget.name = ci->platdata->name; 1763 1764 INIT_LIST_HEAD(&ci->gadget.ep_list); 1765 1766 /* alloc resources */ 1767 ci->qh_pool = dma_pool_create("ci_hw_qh", dev, 1768 sizeof(struct ci_hw_qh), 1769 64, CI_HDRC_PAGE_SIZE); 1770 if (ci->qh_pool == NULL) 1771 return -ENOMEM; 1772 1773 ci->td_pool = dma_pool_create("ci_hw_td", dev, 1774 sizeof(struct ci_hw_td), 1775 64, CI_HDRC_PAGE_SIZE); 1776 if (ci->td_pool == NULL) { 1777 retval = -ENOMEM; 1778 goto free_qh_pool; 1779 } 1780 1781 retval = init_eps(ci); 1782 if (retval) 1783 goto free_pools; 1784 1785 ci->gadget.ep0 = &ci->ep0in->ep; 1786 1787 if (ci->global_phy) { 1788 ci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2); 1789 if (IS_ERR(ci->transceiver)) 1790 ci->transceiver = NULL; 1791 } 1792 1793 if (ci->platdata->flags & CI_HDRC_REQUIRE_TRANSCEIVER) { 1794 if (ci->transceiver == NULL) { 1795 retval = -ENODEV; 1796 goto destroy_eps; 1797 } 1798 } 1799 1800 if (ci->transceiver) { 1801 retval = otg_set_peripheral(ci->transceiver->otg, 1802 &ci->gadget); 1803 /* 1804 * If we implement all USB functions using chipidea drivers, 1805 * it doesn't need to call above API, meanwhile, if we only 1806 * use gadget function, calling above API is useless. 1807 */ 1808 if (retval && retval != -ENOTSUPP) 1809 goto put_transceiver; 1810 } 1811 1812 retval = usb_add_gadget_udc(dev, &ci->gadget); 1813 if (retval) 1814 goto remove_trans; 1815 1816 pm_runtime_no_callbacks(&ci->gadget.dev); 1817 pm_runtime_enable(&ci->gadget.dev); 1818 1819 /* Update ci->vbus_active */ 1820 ci_handle_vbus_change(ci); 1821 1822 return retval; 1823 1824 remove_trans: 1825 if (ci->transceiver) { 1826 otg_set_peripheral(ci->transceiver->otg, NULL); 1827 if (ci->global_phy) 1828 usb_put_phy(ci->transceiver); 1829 } 1830 1831 dev_err(dev, "error = %i\n", retval); 1832 put_transceiver: 1833 if (ci->transceiver && ci->global_phy) 1834 usb_put_phy(ci->transceiver); 1835 destroy_eps: 1836 destroy_eps(ci); 1837 free_pools: 1838 dma_pool_destroy(ci->td_pool); 1839 free_qh_pool: 1840 dma_pool_destroy(ci->qh_pool); 1841 return retval; 1842 } 1843 1844 /** 1845 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC 1846 * 1847 * No interrupts active, the IRQ has been released 1848 */ 1849 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci) 1850 { 1851 if (!ci->roles[CI_ROLE_GADGET]) 1852 return; 1853 1854 usb_del_gadget_udc(&ci->gadget); 1855 1856 destroy_eps(ci); 1857 1858 dma_pool_destroy(ci->td_pool); 1859 dma_pool_destroy(ci->qh_pool); 1860 1861 if (ci->transceiver) { 1862 otg_set_peripheral(ci->transceiver->otg, NULL); 1863 if (ci->global_phy) 1864 usb_put_phy(ci->transceiver); 1865 } 1866 } 1867 1868 static int udc_id_switch_for_device(struct ci_hdrc *ci) 1869 { 1870 if (ci->is_otg) { 1871 ci_clear_otg_interrupt(ci, OTGSC_BSVIS); 1872 ci_enable_otg_interrupt(ci, OTGSC_BSVIE); 1873 } 1874 1875 return 0; 1876 } 1877 1878 static void udc_id_switch_for_host(struct ci_hdrc *ci) 1879 { 1880 if (ci->is_otg) { 1881 /* host doesn't care B_SESSION_VALID event */ 1882 ci_clear_otg_interrupt(ci, OTGSC_BSVIS); 1883 ci_disable_otg_interrupt(ci, OTGSC_BSVIE); 1884 } 1885 } 1886 1887 /** 1888 * ci_hdrc_gadget_init - initialize device related bits 1889 * ci: the controller 1890 * 1891 * This function initializes the gadget, if the device is "device capable". 1892 */ 1893 int ci_hdrc_gadget_init(struct ci_hdrc *ci) 1894 { 1895 struct ci_role_driver *rdrv; 1896 1897 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC)) 1898 return -ENXIO; 1899 1900 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL); 1901 if (!rdrv) 1902 return -ENOMEM; 1903 1904 rdrv->start = udc_id_switch_for_device; 1905 rdrv->stop = udc_id_switch_for_host; 1906 rdrv->irq = udc_irq; 1907 rdrv->name = "gadget"; 1908 ci->roles[CI_ROLE_GADGET] = rdrv; 1909 1910 return udc_start(ci); 1911 } 1912