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