drivers/usb/chipidea/udc.c

   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 "otg.h"
  30 #include "otg_fsm.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         } else {
  89                 hw_write(ci, OP_USBINTR, ~0, 0);
  90         }
  91         return 0;
  92 }
  93
  94 /**
  95  * hw_ep_flush: flush endpoint fifo (execute without interruption)
  96  * @num: endpoint number
  97  * @dir: endpoint direction
  98  *
  99  * This function returns an error code
 100  */
 101 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
 102 {
 103         int n = hw_ep_bit(num, dir);
 104
 105         do {
 106                 /* flush any pending transfer */
 107                 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
 108                 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
 109                         cpu_relax();
 110         } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
 111
 112         return 0;
 113 }
 114
 115 /**
 116  * hw_ep_disable: disables endpoint (execute without interruption)
 117  * @num: endpoint number
 118  * @dir: endpoint direction
 119  *
 120  * This function returns an error code
 121  */
 122 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
 123 {
 124         hw_ep_flush(ci, num, dir);
 125         hw_write(ci, OP_ENDPTCTRL + num,
 126                  dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 127         return 0;
 128 }
 129
 130 /**
 131  * hw_ep_enable: enables endpoint (execute without interruption)
 132  * @num:  endpoint number
 133  * @dir:  endpoint direction
 134  * @type: endpoint type
 135  *
 136  * This function returns an error code
 137  */
 138 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
 139 {
 140         u32 mask, data;
 141
 142         if (dir) {
 143                 mask  = ENDPTCTRL_TXT;  /* type    */
 144                 data  = type << __ffs(mask);
 145
 146                 mask |= ENDPTCTRL_TXS;  /* unstall */
 147                 mask |= ENDPTCTRL_TXR;  /* reset data toggle */
 148                 data |= ENDPTCTRL_TXR;
 149                 mask |= ENDPTCTRL_TXE;  /* enable  */
 150                 data |= ENDPTCTRL_TXE;
 151         } else {
 152                 mask  = ENDPTCTRL_RXT;  /* type    */
 153                 data  = type << __ffs(mask);
 154
 155                 mask |= ENDPTCTRL_RXS;  /* unstall */
 156                 mask |= ENDPTCTRL_RXR;  /* reset data toggle */
 157                 data |= ENDPTCTRL_RXR;
 158                 mask |= ENDPTCTRL_RXE;  /* enable  */
 159                 data |= ENDPTCTRL_RXE;
 160         }
 161         hw_write(ci, OP_ENDPTCTRL + num, mask, data);
 162         return 0;
 163 }
 164
 165 /**
 166  * hw_ep_get_halt: return endpoint halt status
 167  * @num: endpoint number
 168  * @dir: endpoint direction
 169  *
 170  * This function returns 1 if endpoint halted
 171  */
 172 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
 173 {
 174         u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 175
 176         return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
 177 }
 178
 179 /**
 180  * hw_ep_prime: primes endpoint (execute without interruption)
 181  * @num:     endpoint number
 182  * @dir:     endpoint direction
 183  * @is_ctrl: true if control endpoint
 184  *
 185  * This function returns an error code
 186  */
 187 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
 188 {
 189         int n = hw_ep_bit(num, dir);
 190
 191         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 192                 return -EAGAIN;
 193
 194         hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
 195
 196         while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 197                 cpu_relax();
 198         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 199                 return -EAGAIN;
 200
 201         /* status shoult be tested according with manual but it doesn't work */
 202         return 0;
 203 }
 204
 205 /**
 206  * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
 207  *                 without interruption)
 208  * @num:   endpoint number
 209  * @dir:   endpoint direction
 210  * @value: true => stall, false => unstall
 211  *
 212  * This function returns an error code
 213  */
 214 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
 215 {
 216         if (value != 0 && value != 1)
 217                 return -EINVAL;
 218
 219         do {
 220                 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
 221                 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 222                 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
 223
 224                 /* data toggle - reserved for EP0 but it's in ESS */
 225                 hw_write(ci, reg, mask_xs|mask_xr,
 226                           value ? mask_xs : mask_xr);
 227         } while (value != hw_ep_get_halt(ci, num, dir));
 228
 229         return 0;
 230 }
 231
 232 /**
 233  * hw_is_port_high_speed: test if port is high speed
 234  *
 235  * This function returns true if high speed port
 236  */
 237 static int hw_port_is_high_speed(struct ci_hdrc *ci)
 238 {
 239         return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
 240                 hw_read(ci, OP_PORTSC, PORTSC_HSP);
 241 }
 242
 243 /**
 244  * hw_test_and_clear_complete: test & clear complete status (execute without
 245  *                             interruption)
 246  * @n: endpoint number
 247  *
 248  * This function returns complete status
 249  */
 250 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
 251 {
 252         n = ep_to_bit(ci, n);
 253         return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
 254 }
 255
 256 /**
 257  * hw_test_and_clear_intr_active: test & clear active interrupts (execute
 258  *                                without interruption)
 259  *
 260  * This function returns active interrutps
 261  */
 262 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
 263 {
 264         u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
 265
 266         hw_write(ci, OP_USBSTS, ~0, reg);
 267         return reg;
 268 }
 269
 270 /**
 271  * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
 272  *                                interruption)
 273  *
 274  * This function returns guard value
 275  */
 276 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
 277 {
 278         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
 279 }
 280
 281 /**
 282  * hw_test_and_set_setup_guard: test & set setup guard (execute without
 283  *                              interruption)
 284  *
 285  * This function returns guard value
 286  */
 287 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
 288 {
 289         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
 290 }
 291
 292 /**
 293  * hw_usb_set_address: configures USB address (execute without interruption)
 294  * @value: new USB address
 295  *
 296  * This function explicitly sets the address, without the "USBADRA" (advance)
 297  * feature, which is not supported by older versions of the controller.
 298  */
 299 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
 300 {
 301         hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
 302                  value << __ffs(DEVICEADDR_USBADR));
 303 }
 304
 305 /**
 306  * hw_usb_reset: restart device after a bus reset (execute without
 307  *               interruption)
 308  *
 309  * This function returns an error code
 310  */
 311 static int hw_usb_reset(struct ci_hdrc *ci)
 312 {
 313         hw_usb_set_address(ci, 0);
 314
 315         /* ESS flushes only at end?!? */
 316         hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
 317
 318         /* clear setup token semaphores */
 319         hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
 320
 321         /* clear complete status */
 322         hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
 323
 324         /* wait until all bits cleared */
 325         while (hw_read(ci, OP_ENDPTPRIME, ~0))
 326                 udelay(10);             /* not RTOS friendly */
 327
 328         /* reset all endpoints ? */
 329
 330         /* reset internal status and wait for further instructions
 331            no need to verify the port reset status (ESS does it) */
 332
 333         return 0;
 334 }
 335
 336 /******************************************************************************
 337  * UTIL block
 338  *****************************************************************************/
 339
 340 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 341                           unsigned length)
 342 {
 343         int i;
 344         u32 temp;
 345         struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
 346                                                   GFP_ATOMIC);
 347
 348         if (node == NULL)
 349                 return -ENOMEM;
 350
 351         node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC,
 352                                    &node->dma);
 353         if (node->ptr == NULL) {
 354                 kfree(node);
 355                 return -ENOMEM;
 356         }
 357
 358         memset(node->ptr, 0, sizeof(struct ci_hw_td));
 359         node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
 360         node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
 361         node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
 362         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
 363                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 364
 365                 if (hwreq->req.length == 0
 366                                 || hwreq->req.length % hwep->ep.maxpacket)
 367                         mul++;
 368                 node->ptr->token |= mul << __ffs(TD_MULTO);
 369         }
 370
 371         temp = (u32) (hwreq->req.dma + hwreq->req.actual);
 372         if (length) {
 373                 node->ptr->page[0] = cpu_to_le32(temp);
 374                 for (i = 1; i < TD_PAGE_COUNT; i++) {
 375                         u32 page = temp + i * CI_HDRC_PAGE_SIZE;
 376                         page &= ~TD_RESERVED_MASK;
 377                         node->ptr->page[i] = cpu_to_le32(page);
 378                 }
 379         }
 380
 381         hwreq->req.actual += length;
 382
 383         if (!list_empty(&hwreq->tds)) {
 384                 /* get the last entry */
 385                 lastnode = list_entry(hwreq->tds.prev,
 386                                 struct td_node, td);
 387                 lastnode->ptr->next = cpu_to_le32(node->dma);
 388         }
 389
 390         INIT_LIST_HEAD(&node->td);
 391         list_add_tail(&node->td, &hwreq->tds);
 392
 393         return 0;
 394 }
 395
 396 /**
 397  * _usb_addr: calculates endpoint address from direction & number
 398  * @ep:  endpoint
 399  */
 400 static inline u8 _usb_addr(struct ci_hw_ep *ep)
 401 {
 402         return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
 403 }
 404
 405 /**
 406  * _hardware_enqueue: configures a request at hardware level
 407  * @hwep:   endpoint
 408  * @hwreq:  request
 409  *
 410  * This function returns an error code
 411  */
 412 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 413 {
 414         struct ci_hdrc *ci = hwep->ci;
 415         int ret = 0;
 416         unsigned rest = hwreq->req.length;
 417         int pages = TD_PAGE_COUNT;
 418         struct td_node *firstnode, *lastnode;
 419
 420         /* don't queue twice */
 421         if (hwreq->req.status == -EALREADY)
 422                 return -EALREADY;
 423
 424         hwreq->req.status = -EALREADY;
 425
 426         ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
 427         if (ret)
 428                 return ret;
 429
 430         /*
 431          * The first buffer could be not page aligned.
 432          * In that case we have to span into one extra td.
 433          */
 434         if (hwreq->req.dma % PAGE_SIZE)
 435                 pages--;
 436
 437         if (rest == 0) {
 438                 ret = add_td_to_list(hwep, hwreq, 0);
 439                 if (ret < 0)
 440                         goto done;
 441         }
 442
 443         while (rest > 0) {
 444                 unsigned count = min(hwreq->req.length - hwreq->req.actual,
 445                                         (unsigned)(pages * CI_HDRC_PAGE_SIZE));
 446                 ret = add_td_to_list(hwep, hwreq, count);
 447                 if (ret < 0)
 448                         goto done;
 449
 450                 rest -= count;
 451         }
 452
 453         if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
 454             && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
 455                 ret = add_td_to_list(hwep, hwreq, 0);
 456                 if (ret < 0)
 457                         goto done;
 458         }
 459
 460         firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 461
 462         lastnode = list_entry(hwreq->tds.prev,
 463                 struct td_node, td);
 464
 465         lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
 466         if (!hwreq->req.no_interrupt)
 467                 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
 468         wmb();
 469
 470         hwreq->req.actual = 0;
 471         if (!list_empty(&hwep->qh.queue)) {
 472                 struct ci_hw_req *hwreqprev;
 473                 int n = hw_ep_bit(hwep->num, hwep->dir);
 474                 int tmp_stat;
 475                 struct td_node *prevlastnode;
 476                 u32 next = firstnode->dma & TD_ADDR_MASK;
 477
 478                 hwreqprev = list_entry(hwep->qh.queue.prev,
 479                                 struct ci_hw_req, queue);
 480                 prevlastnode = list_entry(hwreqprev->tds.prev,
 481                                 struct td_node, td);
 482
 483                 prevlastnode->ptr->next = cpu_to_le32(next);
 484                 wmb();
 485                 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 486                         goto done;
 487                 do {
 488                         hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
 489                         tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
 490                 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
 491                 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
 492                 if (tmp_stat)
 493                         goto done;
 494         }
 495
 496         /*  QH configuration */
 497         hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
 498         hwep->qh.ptr->td.token &=
 499                 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
 500
 501         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
 502                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 503
 504                 if (hwreq->req.length == 0
 505                                 || hwreq->req.length % hwep->ep.maxpacket)
 506                         mul++;
 507                 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
 508         }
 509
 510         wmb();   /* synchronize before ep prime */
 511
 512         ret = hw_ep_prime(ci, hwep->num, hwep->dir,
 513                            hwep->type == USB_ENDPOINT_XFER_CONTROL);
 514 done:
 515         return ret;
 516 }
 517
 518 /*
 519  * free_pending_td: remove a pending request for the endpoint
 520  * @hwep: endpoint
 521  */
 522 static void free_pending_td(struct ci_hw_ep *hwep)
 523 {
 524         struct td_node *pending = hwep->pending_td;
 525
 526         dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
 527         hwep->pending_td = NULL;
 528         kfree(pending);
 529 }
 530
 531 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
 532                                            struct td_node *node)
 533 {
 534         hwep->qh.ptr->td.next = node->dma;
 535         hwep->qh.ptr->td.token &=
 536                 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
 537
 538         /* Synchronize before ep prime */
 539         wmb();
 540
 541         return hw_ep_prime(ci, hwep->num, hwep->dir,
 542                                 hwep->type == USB_ENDPOINT_XFER_CONTROL);
 543 }
 544
 545 /**
 546  * _hardware_dequeue: handles a request at hardware level
 547  * @gadget: gadget
 548  * @hwep:   endpoint
 549  *
 550  * This function returns an error code
 551  */
 552 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 553 {
 554         u32 tmptoken;
 555         struct td_node *node, *tmpnode;
 556         unsigned remaining_length;
 557         unsigned actual = hwreq->req.length;
 558         struct ci_hdrc *ci = hwep->ci;
 559
 560         if (hwreq->req.status != -EALREADY)
 561                 return -EINVAL;
 562
 563         hwreq->req.status = 0;
 564
 565         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 566                 tmptoken = le32_to_cpu(node->ptr->token);
 567                 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
 568                         int n = hw_ep_bit(hwep->num, hwep->dir);
 569
 570                         if (ci->rev == CI_REVISION_24)
 571                                 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 572                                         reprime_dtd(ci, hwep, node);
 573                         hwreq->req.status = -EALREADY;
 574                         return -EBUSY;
 575                 }
 576
 577                 remaining_length = (tmptoken & TD_TOTAL_BYTES);
 578                 remaining_length >>= __ffs(TD_TOTAL_BYTES);
 579                 actual -= remaining_length;
 580
 581                 hwreq->req.status = tmptoken & TD_STATUS;
 582                 if ((TD_STATUS_HALTED & hwreq->req.status)) {
 583                         hwreq->req.status = -EPIPE;
 584                         break;
 585                 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
 586                         hwreq->req.status = -EPROTO;
 587                         break;
 588                 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
 589                         hwreq->req.status = -EILSEQ;
 590                         break;
 591                 }
 592
 593                 if (remaining_length) {
 594                         if (hwep->dir) {
 595                                 hwreq->req.status = -EPROTO;
 596                                 break;
 597                         }
 598                 }
 599                 /*
 600                  * As the hardware could still address the freed td
 601                  * which will run the udc unusable, the cleanup of the
 602                  * td has to be delayed by one.
 603                  */
 604                 if (hwep->pending_td)
 605                         free_pending_td(hwep);
 606
 607                 hwep->pending_td = node;
 608                 list_del_init(&node->td);
 609         }
 610
 611         usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
 612
 613         hwreq->req.actual += actual;
 614
 615         if (hwreq->req.status)
 616                 return hwreq->req.status;
 617
 618         return hwreq->req.actual;
 619 }
 620
 621 /**
 622  * _ep_nuke: dequeues all endpoint requests
 623  * @hwep: endpoint
 624  *
 625  * This function returns an error code
 626  * Caller must hold lock
 627  */
 628 static int _ep_nuke(struct ci_hw_ep *hwep)
 629 __releases(hwep->lock)
 630 __acquires(hwep->lock)
 631 {
 632         struct td_node *node, *tmpnode;
 633         if (hwep == NULL)
 634                 return -EINVAL;
 635
 636         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
 637
 638         while (!list_empty(&hwep->qh.queue)) {
 639
 640                 /* pop oldest request */
 641                 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
 642                                                      struct ci_hw_req, queue);
 643
 644                 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 645                         dma_pool_free(hwep->td_pool, node->ptr, node->dma);
 646                         list_del_init(&node->td);
 647                         node->ptr = NULL;
 648                         kfree(node);
 649                 }
 650
 651                 list_del_init(&hwreq->queue);
 652                 hwreq->req.status = -ESHUTDOWN;
 653
 654                 if (hwreq->req.complete != NULL) {
 655                         spin_unlock(hwep->lock);
 656                         usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
 657                         spin_lock(hwep->lock);
 658                 }
 659         }
 660
 661         if (hwep->pending_td)
 662                 free_pending_td(hwep);
 663
 664         return 0;
 665 }
 666
 667 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
 668 {
 669         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
 670         int direction, retval = 0;
 671         unsigned long flags;
 672
 673         if (ep == NULL || hwep->ep.desc == NULL)
 674                 return -EINVAL;
 675
 676         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
 677                 return -EOPNOTSUPP;
 678
 679         spin_lock_irqsave(hwep->lock, flags);
 680
 681         if (value && hwep->dir == TX && check_transfer &&
 682                 !list_empty(&hwep->qh.queue) &&
 683                         !usb_endpoint_xfer_control(hwep->ep.desc)) {
 684                 spin_unlock_irqrestore(hwep->lock, flags);
 685                 return -EAGAIN;
 686         }
 687
 688         direction = hwep->dir;
 689         do {
 690                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
 691
 692                 if (!value)
 693                         hwep->wedge = 0;
 694
 695                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
 696                         hwep->dir = (hwep->dir == TX) ? RX : TX;
 697
 698         } while (hwep->dir != direction);
 699
 700         spin_unlock_irqrestore(hwep->lock, flags);
 701         return retval;
 702 }
 703
 704
 705 /**
 706  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 707  * @gadget: gadget
 708  *
 709  * This function returns an error code
 710  */
 711 static int _gadget_stop_activity(struct usb_gadget *gadget)
 712 {
 713         struct usb_ep *ep;
 714         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 715         unsigned long flags;
 716
 717         spin_lock_irqsave(&ci->lock, flags);
 718         ci->gadget.speed = USB_SPEED_UNKNOWN;
 719         ci->remote_wakeup = 0;
 720         ci->suspended = 0;
 721         spin_unlock_irqrestore(&ci->lock, flags);
 722
 723         /* flush all endpoints */
 724         gadget_for_each_ep(ep, gadget) {
 725                 usb_ep_fifo_flush(ep);
 726         }
 727         usb_ep_fifo_flush(&ci->ep0out->ep);
 728         usb_ep_fifo_flush(&ci->ep0in->ep);
 729
 730         /* make sure to disable all endpoints */
 731         gadget_for_each_ep(ep, gadget) {
 732                 usb_ep_disable(ep);
 733         }
 734
 735         if (ci->status != NULL) {
 736                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 737                 ci->status = NULL;
 738         }
 739
 740         return 0;
 741 }
 742
 743 /******************************************************************************
 744  * ISR block
 745  *****************************************************************************/
 746 /**
 747  * isr_reset_handler: USB reset interrupt handler
 748  * @ci: UDC device
 749  *
 750  * This function resets USB engine after a bus reset occurred
 751  */
 752 static void isr_reset_handler(struct ci_hdrc *ci)
 753 __releases(ci->lock)
 754 __acquires(ci->lock)
 755 {
 756         int retval;
 757
 758         spin_unlock(&ci->lock);
 759         if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 760                 usb_gadget_udc_reset(&ci->gadget, ci->driver);
 761
 762         retval = _gadget_stop_activity(&ci->gadget);
 763         if (retval)
 764                 goto done;
 765
 766         retval = hw_usb_reset(ci);
 767         if (retval)
 768                 goto done;
 769
 770         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 771         if (ci->status == NULL)
 772                 retval = -ENOMEM;
 773
 774 done:
 775         spin_lock(&ci->lock);
 776
 777         if (retval)
 778                 dev_err(ci->dev, "error: %i\n", retval);
 779 }
 780
 781 /**
 782  * isr_get_status_complete: get_status request complete function
 783  * @ep:  endpoint
 784  * @req: request handled
 785  *
 786  * Caller must release lock
 787  */
 788 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 789 {
 790         if (ep == NULL || req == NULL)
 791                 return;
 792
 793         kfree(req->buf);
 794         usb_ep_free_request(ep, req);
 795 }
 796
 797 /**
 798  * _ep_queue: queues (submits) an I/O request to an endpoint
 799  * @ep:        endpoint
 800  * @req:       request
 801  * @gfp_flags: GFP flags (not used)
 802  *
 803  * Caller must hold lock
 804  * This function returns an error code
 805  */
 806 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 807                     gfp_t __maybe_unused gfp_flags)
 808 {
 809         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 810         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 811         struct ci_hdrc *ci = hwep->ci;
 812         int retval = 0;
 813
 814         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 815                 return -EINVAL;
 816
 817         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 818                 if (req->length)
 819                         hwep = (ci->ep0_dir == RX) ?
 820                                ci->ep0out : ci->ep0in;
 821                 if (!list_empty(&hwep->qh.queue)) {
 822                         _ep_nuke(hwep);
 823                         retval = -EOVERFLOW;
 824                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 825                                  _usb_addr(hwep));
 826                 }
 827         }
 828
 829         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 830             hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
 831                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 832                 return -EMSGSIZE;
 833         }
 834
 835         /* first nuke then test link, e.g. previous status has not sent */
 836         if (!list_empty(&hwreq->queue)) {
 837                 dev_err(hwep->ci->dev, "request already in queue\n");
 838                 return -EBUSY;
 839         }
 840
 841         /* push request */
 842         hwreq->req.status = -EINPROGRESS;
 843         hwreq->req.actual = 0;
 844
 845         retval = _hardware_enqueue(hwep, hwreq);
 846
 847         if (retval == -EALREADY)
 848                 retval = 0;
 849         if (!retval)
 850                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
 851
 852         return retval;
 853 }
 854
 855 /**
 856  * isr_get_status_response: get_status request response
 857  * @ci: ci struct
 858  * @setup: setup request packet
 859  *
 860  * This function returns an error code
 861  */
 862 static int isr_get_status_response(struct ci_hdrc *ci,
 863                                    struct usb_ctrlrequest *setup)
 864 __releases(hwep->lock)
 865 __acquires(hwep->lock)
 866 {
 867         struct ci_hw_ep *hwep = ci->ep0in;
 868         struct usb_request *req = NULL;
 869         gfp_t gfp_flags = GFP_ATOMIC;
 870         int dir, num, retval;
 871
 872         if (hwep == NULL || setup == NULL)
 873                 return -EINVAL;
 874
 875         spin_unlock(hwep->lock);
 876         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 877         spin_lock(hwep->lock);
 878         if (req == NULL)
 879                 return -ENOMEM;
 880
 881         req->complete = isr_get_status_complete;
 882         req->length   = 2;
 883         req->buf      = kzalloc(req->length, gfp_flags);
 884         if (req->buf == NULL) {
 885                 retval = -ENOMEM;
 886                 goto err_free_req;
 887         }
 888
 889         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
 890                 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
 891                         ci->gadget.is_selfpowered;
 892         } else if ((setup->bRequestType & USB_RECIP_MASK) \
 893                    == USB_RECIP_ENDPOINT) {
 894                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
 895                         TX : RX;
 896                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 897                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
 898         }
 899         /* else do nothing; reserved for future use */
 900
 901         retval = _ep_queue(&hwep->ep, req, gfp_flags);
 902         if (retval)
 903                 goto err_free_buf;
 904
 905         return 0;
 906
 907  err_free_buf:
 908         kfree(req->buf);
 909  err_free_req:
 910         spin_unlock(hwep->lock);
 911         usb_ep_free_request(&hwep->ep, req);
 912         spin_lock(hwep->lock);
 913         return retval;
 914 }
 915
 916 /**
 917  * isr_setup_status_complete: setup_status request complete function
 918  * @ep:  endpoint
 919  * @req: request handled
 920  *
 921  * Caller must release lock. Put the port in test mode if test mode
 922  * feature is selected.
 923  */
 924 static void
 925 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
 926 {
 927         struct ci_hdrc *ci = req->context;
 928         unsigned long flags;
 929
 930         if (ci->setaddr) {
 931                 hw_usb_set_address(ci, ci->address);
 932                 ci->setaddr = false;
 933                 if (ci->address)
 934                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
 935         }
 936
 937         spin_lock_irqsave(&ci->lock, flags);
 938         if (ci->test_mode)
 939                 hw_port_test_set(ci, ci->test_mode);
 940         spin_unlock_irqrestore(&ci->lock, flags);
 941 }
 942
 943 /**
 944  * isr_setup_status_phase: queues the status phase of a setup transation
 945  * @ci: ci struct
 946  *
 947  * This function returns an error code
 948  */
 949 static int isr_setup_status_phase(struct ci_hdrc *ci)
 950 {
 951         int retval;
 952         struct ci_hw_ep *hwep;
 953
 954         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
 955         ci->status->context = ci;
 956         ci->status->complete = isr_setup_status_complete;
 957
 958         retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
 959
 960         return retval;
 961 }
 962
 963 /**
 964  * isr_tr_complete_low: transaction complete low level handler
 965  * @hwep: endpoint
 966  *
 967  * This function returns an error code
 968  * Caller must hold lock
 969  */
 970 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
 971 __releases(hwep->lock)
 972 __acquires(hwep->lock)
 973 {
 974         struct ci_hw_req *hwreq, *hwreqtemp;
 975         struct ci_hw_ep *hweptemp = hwep;
 976         int retval = 0;
 977
 978         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
 979                         queue) {
 980                 retval = _hardware_dequeue(hwep, hwreq);
 981                 if (retval < 0)
 982                         break;
 983                 list_del_init(&hwreq->queue);
 984                 if (hwreq->req.complete != NULL) {
 985                         spin_unlock(hwep->lock);
 986                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
 987                                         hwreq->req.length)
 988                                 hweptemp = hwep->ci->ep0in;
 989                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
 990                         spin_lock(hwep->lock);
 991                 }
 992         }
 993
 994         if (retval == -EBUSY)
 995                 retval = 0;
 996
 997         return retval;
 998 }
 999
1000 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1001 {
1002         dev_warn(&ci->gadget.dev,
1003                 "connect the device to an alternate port if you want HNP\n");
1004         return isr_setup_status_phase(ci);
1005 }
1006
1007 /**
1008  * isr_setup_packet_handler: setup packet handler
1009  * @ci: UDC descriptor
1010  *
1011  * This function handles setup packet
1012  */
1013 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1014 __releases(ci->lock)
1015 __acquires(ci->lock)
1016 {
1017         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1018         struct usb_ctrlrequest req;
1019         int type, num, dir, err = -EINVAL;
1020         u8 tmode = 0;
1021
1022         /*
1023          * Flush data and handshake transactions of previous
1024          * setup packet.
1025          */
1026         _ep_nuke(ci->ep0out);
1027         _ep_nuke(ci->ep0in);
1028
1029         /* read_setup_packet */
1030         do {
1031                 hw_test_and_set_setup_guard(ci);
1032                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1033         } while (!hw_test_and_clear_setup_guard(ci));
1034
1035         type = req.bRequestType;
1036
1037         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1038
1039         switch (req.bRequest) {
1040         case USB_REQ_CLEAR_FEATURE:
1041                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1042                                 le16_to_cpu(req.wValue) ==
1043                                 USB_ENDPOINT_HALT) {
1044                         if (req.wLength != 0)
1045                                 break;
1046                         num  = le16_to_cpu(req.wIndex);
1047                         dir = num & USB_ENDPOINT_DIR_MASK;
1048                         num &= USB_ENDPOINT_NUMBER_MASK;
1049                         if (dir) /* TX */
1050                                 num += ci->hw_ep_max / 2;
1051                         if (!ci->ci_hw_ep[num].wedge) {
1052                                 spin_unlock(&ci->lock);
1053                                 err = usb_ep_clear_halt(
1054                                         &ci->ci_hw_ep[num].ep);
1055                                 spin_lock(&ci->lock);
1056                                 if (err)
1057                                         break;
1058                         }
1059                         err = isr_setup_status_phase(ci);
1060                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1061                                 le16_to_cpu(req.wValue) ==
1062                                 USB_DEVICE_REMOTE_WAKEUP) {
1063                         if (req.wLength != 0)
1064                                 break;
1065                         ci->remote_wakeup = 0;
1066                         err = isr_setup_status_phase(ci);
1067                 } else {
1068                         goto delegate;
1069                 }
1070                 break;
1071         case USB_REQ_GET_STATUS:
1072                 if (type != (USB_DIR_IN|USB_RECIP_DEVICE)   &&
1073                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1074                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1075                         goto delegate;
1076                 if (le16_to_cpu(req.wLength) != 2 ||
1077                     le16_to_cpu(req.wValue)  != 0)
1078                         break;
1079                 err = isr_get_status_response(ci, &req);
1080                 break;
1081         case USB_REQ_SET_ADDRESS:
1082                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1083                         goto delegate;
1084                 if (le16_to_cpu(req.wLength) != 0 ||
1085                     le16_to_cpu(req.wIndex)  != 0)
1086                         break;
1087                 ci->address = (u8)le16_to_cpu(req.wValue);
1088                 ci->setaddr = true;
1089                 err = isr_setup_status_phase(ci);
1090                 break;
1091         case USB_REQ_SET_FEATURE:
1092                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1093                                 le16_to_cpu(req.wValue) ==
1094                                 USB_ENDPOINT_HALT) {
1095                         if (req.wLength != 0)
1096                                 break;
1097                         num  = le16_to_cpu(req.wIndex);
1098                         dir = num & USB_ENDPOINT_DIR_MASK;
1099                         num &= USB_ENDPOINT_NUMBER_MASK;
1100                         if (dir) /* TX */
1101                                 num += ci->hw_ep_max / 2;
1102
1103                         spin_unlock(&ci->lock);
1104                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1105                         spin_lock(&ci->lock);
1106                         if (!err)
1107                                 isr_setup_status_phase(ci);
1108                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1109                         if (req.wLength != 0)
1110                                 break;
1111                         switch (le16_to_cpu(req.wValue)) {
1112                         case USB_DEVICE_REMOTE_WAKEUP:
1113                                 ci->remote_wakeup = 1;
1114                                 err = isr_setup_status_phase(ci);
1115                                 break;
1116                         case USB_DEVICE_TEST_MODE:
1117                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1118                                 switch (tmode) {
1119                                 case TEST_J:
1120                                 case TEST_K:
1121                                 case TEST_SE0_NAK:
1122                                 case TEST_PACKET:
1123                                 case TEST_FORCE_EN:
1124                                         ci->test_mode = tmode;
1125                                         err = isr_setup_status_phase(
1126                                                         ci);
1127                                         break;
1128                                 default:
1129                                         break;
1130                                 }
1131                                 break;
1132                         case USB_DEVICE_B_HNP_ENABLE:
1133                                 if (ci_otg_is_fsm_mode(ci)) {
1134                                         ci->gadget.b_hnp_enable = 1;
1135                                         err = isr_setup_status_phase(
1136                                                         ci);
1137                                 }
1138                                 break;
1139                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1140                                 if (ci_otg_is_fsm_mode(ci))
1141                                         err = otg_a_alt_hnp_support(ci);
1142                                 break;
1143                         case USB_DEVICE_A_HNP_SUPPORT:
1144                                 if (ci_otg_is_fsm_mode(ci)) {
1145                                         ci->gadget.a_hnp_support = 1;
1146                                         err = isr_setup_status_phase(
1147                                                         ci);
1148                                 }
1149                                 break;
1150                         default:
1151                                 goto delegate;
1152                         }
1153                 } else {
1154                         goto delegate;
1155                 }
1156                 break;
1157         default:
1158 delegate:
1159                 if (req.wLength == 0)   /* no data phase */
1160                         ci->ep0_dir = TX;
1161
1162                 spin_unlock(&ci->lock);
1163                 err = ci->driver->setup(&ci->gadget, &req);
1164                 spin_lock(&ci->lock);
1165                 break;
1166         }
1167
1168         if (err < 0) {
1169                 spin_unlock(&ci->lock);
1170                 if (_ep_set_halt(&hwep->ep, 1, false))
1171                         dev_err(ci->dev, "error: _ep_set_halt\n");
1172                 spin_lock(&ci->lock);
1173         }
1174 }
1175
1176 /**
1177  * isr_tr_complete_handler: transaction complete interrupt handler
1178  * @ci: UDC descriptor
1179  *
1180  * This function handles traffic events
1181  */
1182 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1183 __releases(ci->lock)
1184 __acquires(ci->lock)
1185 {
1186         unsigned i;
1187         int err;
1188
1189         for (i = 0; i < ci->hw_ep_max; i++) {
1190                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1191
1192                 if (hwep->ep.desc == NULL)
1193                         continue;   /* not configured */
1194
1195                 if (hw_test_and_clear_complete(ci, i)) {
1196                         err = isr_tr_complete_low(hwep);
1197                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1198                                 if (err > 0)   /* needs status phase */
1199                                         err = isr_setup_status_phase(ci);
1200                                 if (err < 0) {
1201                                         spin_unlock(&ci->lock);
1202                                         if (_ep_set_halt(&hwep->ep, 1, false))
1203                                                 dev_err(ci->dev,
1204                                                 "error: _ep_set_halt\n");
1205                                         spin_lock(&ci->lock);
1206                                 }
1207                         }
1208                 }
1209
1210                 /* Only handle setup packet below */
1211                 if (i == 0 &&
1212                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1213                         isr_setup_packet_handler(ci);
1214         }
1215 }
1216
1217 /******************************************************************************
1218  * ENDPT block
1219  *****************************************************************************/
1220 /**
1221  * ep_enable: configure endpoint, making it usable
1222  *
1223  * Check usb_ep_enable() at "usb_gadget.h" for details
1224  */
1225 static int ep_enable(struct usb_ep *ep,
1226                      const struct usb_endpoint_descriptor *desc)
1227 {
1228         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1229         int retval = 0;
1230         unsigned long flags;
1231         u32 cap = 0;
1232
1233         if (ep == NULL || desc == NULL)
1234                 return -EINVAL;
1235
1236         spin_lock_irqsave(hwep->lock, flags);
1237
1238         /* only internal SW should enable ctrl endpts */
1239
1240         if (!list_empty(&hwep->qh.queue)) {
1241                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1242                 spin_unlock_irqrestore(hwep->lock, flags);
1243                 return -EBUSY;
1244         }
1245
1246         hwep->ep.desc = desc;
1247
1248         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1249         hwep->num  = usb_endpoint_num(desc);
1250         hwep->type = usb_endpoint_type(desc);
1251
1252         hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1253         hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1254
1255         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1256                 cap |= QH_IOS;
1257
1258         cap |= QH_ZLT;
1259         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1260         /*
1261          * For ISO-TX, we set mult at QH as the largest value, and use
1262          * MultO at TD as real mult value.
1263          */
1264         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1265                 cap |= 3 << __ffs(QH_MULT);
1266
1267         hwep->qh.ptr->cap = cpu_to_le32(cap);
1268
1269         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1270
1271         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1272                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1273                 retval = -EINVAL;
1274         }
1275
1276         /*
1277          * Enable endpoints in the HW other than ep0 as ep0
1278          * is always enabled
1279          */
1280         if (hwep->num)
1281                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1282                                        hwep->type);
1283
1284         spin_unlock_irqrestore(hwep->lock, flags);
1285         return retval;
1286 }
1287
1288 /**
1289  * ep_disable: endpoint is no longer usable
1290  *
1291  * Check usb_ep_disable() at "usb_gadget.h" for details
1292  */
1293 static int ep_disable(struct usb_ep *ep)
1294 {
1295         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1296         int direction, retval = 0;
1297         unsigned long flags;
1298
1299         if (ep == NULL)
1300                 return -EINVAL;
1301         else if (hwep->ep.desc == NULL)
1302                 return -EBUSY;
1303
1304         spin_lock_irqsave(hwep->lock, flags);
1305
1306         /* only internal SW should disable ctrl endpts */
1307
1308         direction = hwep->dir;
1309         do {
1310                 retval |= _ep_nuke(hwep);
1311                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1312
1313                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1314                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1315
1316         } while (hwep->dir != direction);
1317
1318         hwep->ep.desc = NULL;
1319
1320         spin_unlock_irqrestore(hwep->lock, flags);
1321         return retval;
1322 }
1323
1324 /**
1325  * ep_alloc_request: allocate a request object to use with this endpoint
1326  *
1327  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1328  */
1329 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1330 {
1331         struct ci_hw_req *hwreq = NULL;
1332
1333         if (ep == NULL)
1334                 return NULL;
1335
1336         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1337         if (hwreq != NULL) {
1338                 INIT_LIST_HEAD(&hwreq->queue);
1339                 INIT_LIST_HEAD(&hwreq->tds);
1340         }
1341
1342         return (hwreq == NULL) ? NULL : &hwreq->req;
1343 }
1344
1345 /**
1346  * ep_free_request: frees a request object
1347  *
1348  * Check usb_ep_free_request() at "usb_gadget.h" for details
1349  */
1350 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1351 {
1352         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1353         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1354         struct td_node *node, *tmpnode;
1355         unsigned long flags;
1356
1357         if (ep == NULL || req == NULL) {
1358                 return;
1359         } else if (!list_empty(&hwreq->queue)) {
1360                 dev_err(hwep->ci->dev, "freeing queued request\n");
1361                 return;
1362         }
1363
1364         spin_lock_irqsave(hwep->lock, flags);
1365
1366         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1367                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1368                 list_del_init(&node->td);
1369                 node->ptr = NULL;
1370                 kfree(node);
1371         }
1372
1373         kfree(hwreq);
1374
1375         spin_unlock_irqrestore(hwep->lock, flags);
1376 }
1377
1378 /**
1379  * ep_queue: queues (submits) an I/O request to an endpoint
1380  *
1381  * Check usb_ep_queue()* at usb_gadget.h" for details
1382  */
1383 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1384                     gfp_t __maybe_unused gfp_flags)
1385 {
1386         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1387         int retval = 0;
1388         unsigned long flags;
1389
1390         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1391                 return -EINVAL;
1392
1393         spin_lock_irqsave(hwep->lock, flags);
1394         retval = _ep_queue(ep, req, gfp_flags);
1395         spin_unlock_irqrestore(hwep->lock, flags);
1396         return retval;
1397 }
1398
1399 /**
1400  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1401  *
1402  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1403  */
1404 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1405 {
1406         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1407         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1408         unsigned long flags;
1409         struct td_node *node, *tmpnode;
1410
1411         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1412                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1413                 list_empty(&hwep->qh.queue))
1414                 return -EINVAL;
1415
1416         spin_lock_irqsave(hwep->lock, flags);
1417
1418         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1419
1420         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1421                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1422                 list_del(&node->td);
1423                 kfree(node);
1424         }
1425
1426         /* pop request */
1427         list_del_init(&hwreq->queue);
1428
1429         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1430
1431         req->status = -ECONNRESET;
1432
1433         if (hwreq->req.complete != NULL) {
1434                 spin_unlock(hwep->lock);
1435                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1436                 spin_lock(hwep->lock);
1437         }
1438
1439         spin_unlock_irqrestore(hwep->lock, flags);
1440         return 0;
1441 }
1442
1443 /**
1444  * ep_set_halt: sets the endpoint halt feature
1445  *
1446  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1447  */
1448 static int ep_set_halt(struct usb_ep *ep, int value)
1449 {
1450         return _ep_set_halt(ep, value, true);
1451 }
1452
1453 /**
1454  * ep_set_wedge: sets the halt feature and ignores clear requests
1455  *
1456  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1457  */
1458 static int ep_set_wedge(struct usb_ep *ep)
1459 {
1460         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1461         unsigned long flags;
1462
1463         if (ep == NULL || hwep->ep.desc == NULL)
1464                 return -EINVAL;
1465
1466         spin_lock_irqsave(hwep->lock, flags);
1467         hwep->wedge = 1;
1468         spin_unlock_irqrestore(hwep->lock, flags);
1469
1470         return usb_ep_set_halt(ep);
1471 }
1472
1473 /**
1474  * ep_fifo_flush: flushes contents of a fifo
1475  *
1476  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1477  */
1478 static void ep_fifo_flush(struct usb_ep *ep)
1479 {
1480         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1481         unsigned long flags;
1482
1483         if (ep == NULL) {
1484                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1485                 return;
1486         }
1487
1488         spin_lock_irqsave(hwep->lock, flags);
1489
1490         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1491
1492         spin_unlock_irqrestore(hwep->lock, flags);
1493 }
1494
1495 /**
1496  * Endpoint-specific part of the API to the USB controller hardware
1497  * Check "usb_gadget.h" for details
1498  */
1499 static const struct usb_ep_ops usb_ep_ops = {
1500         .enable        = ep_enable,
1501         .disable       = ep_disable,
1502         .alloc_request = ep_alloc_request,
1503         .free_request  = ep_free_request,
1504         .queue         = ep_queue,
1505         .dequeue       = ep_dequeue,
1506         .set_halt      = ep_set_halt,
1507         .set_wedge     = ep_set_wedge,
1508         .fifo_flush    = ep_fifo_flush,
1509 };
1510
1511 /******************************************************************************
1512  * GADGET block
1513  *****************************************************************************/
1514 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1515 {
1516         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1517         unsigned long flags;
1518         int gadget_ready = 0;
1519
1520         spin_lock_irqsave(&ci->lock, flags);
1521         ci->vbus_active = is_active;
1522         if (ci->driver)
1523                 gadget_ready = 1;
1524         spin_unlock_irqrestore(&ci->lock, flags);
1525
1526         if (gadget_ready) {
1527                 if (is_active) {
1528                         pm_runtime_get_sync(&_gadget->dev);
1529                         hw_device_reset(ci);
1530                         hw_device_state(ci, ci->ep0out->qh.dma);
1531                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1532                         usb_udc_vbus_handler(_gadget, true);
1533                 } else {
1534                         usb_udc_vbus_handler(_gadget, false);
1535                         if (ci->driver)
1536                                 ci->driver->disconnect(&ci->gadget);
1537                         hw_device_state(ci, 0);
1538                         if (ci->platdata->notify_event)
1539                                 ci->platdata->notify_event(ci,
1540                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1541                         _gadget_stop_activity(&ci->gadget);
1542                         pm_runtime_put_sync(&_gadget->dev);
1543                         usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1544                 }
1545         }
1546
1547         return 0;
1548 }
1549
1550 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1551 {
1552         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1553         unsigned long flags;
1554         int ret = 0;
1555
1556         spin_lock_irqsave(&ci->lock, flags);
1557         if (!ci->remote_wakeup) {
1558                 ret = -EOPNOTSUPP;
1559                 goto out;
1560         }
1561         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1562                 ret = -EINVAL;
1563                 goto out;
1564         }
1565         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1566 out:
1567         spin_unlock_irqrestore(&ci->lock, flags);
1568         return ret;
1569 }
1570
1571 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1572 {
1573         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1574
1575         if (ci->usb_phy)
1576                 return usb_phy_set_power(ci->usb_phy, ma);
1577         return -ENOTSUPP;
1578 }
1579
1580 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1581 {
1582         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1583         struct ci_hw_ep *hwep = ci->ep0in;
1584         unsigned long flags;
1585
1586         spin_lock_irqsave(hwep->lock, flags);
1587         _gadget->is_selfpowered = (is_on != 0);
1588         spin_unlock_irqrestore(hwep->lock, flags);
1589
1590         return 0;
1591 }
1592
1593 /* Change Data+ pullup status
1594  * this func is used by usb_gadget_connect/disconnet
1595  */
1596 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1597 {
1598         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1599
1600         /* Data+ pullup controlled by OTG state machine in OTG fsm mode */
1601         if (ci_otg_is_fsm_mode(ci))
1602                 return 0;
1603
1604         pm_runtime_get_sync(&ci->gadget.dev);
1605         if (is_on)
1606                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1607         else
1608                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1609         pm_runtime_put_sync(&ci->gadget.dev);
1610
1611         return 0;
1612 }
1613
1614 static int ci_udc_start(struct usb_gadget *gadget,
1615                          struct usb_gadget_driver *driver);
1616 static int ci_udc_stop(struct usb_gadget *gadget);
1617 /**
1618  * Device operations part of the API to the USB controller hardware,
1619  * which don't involve endpoints (or i/o)
1620  * Check  "usb_gadget.h" for details
1621  */
1622 static const struct usb_gadget_ops usb_gadget_ops = {
1623         .vbus_session   = ci_udc_vbus_session,
1624         .wakeup         = ci_udc_wakeup,
1625         .set_selfpowered        = ci_udc_selfpowered,
1626         .pullup         = ci_udc_pullup,
1627         .vbus_draw      = ci_udc_vbus_draw,
1628         .udc_start      = ci_udc_start,
1629         .udc_stop       = ci_udc_stop,
1630 };
1631
1632 static int init_eps(struct ci_hdrc *ci)
1633 {
1634         int retval = 0, i, j;
1635
1636         for (i = 0; i < ci->hw_ep_max/2; i++)
1637                 for (j = RX; j <= TX; j++) {
1638                         int k = i + j * ci->hw_ep_max/2;
1639                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1640
1641                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1642                                         (j == TX)  ? "in" : "out");
1643
1644                         hwep->ci          = ci;
1645                         hwep->lock         = &ci->lock;
1646                         hwep->td_pool      = ci->td_pool;
1647
1648                         hwep->ep.name      = hwep->name;
1649                         hwep->ep.ops       = &usb_ep_ops;
1650
1651                         if (i == 0) {
1652                                 hwep->ep.caps.type_control = true;
1653                         } else {
1654                                 hwep->ep.caps.type_iso = true;
1655                                 hwep->ep.caps.type_bulk = true;
1656                                 hwep->ep.caps.type_int = true;
1657                         }
1658
1659                         if (j == TX)
1660                                 hwep->ep.caps.dir_in = true;
1661                         else
1662                                 hwep->ep.caps.dir_out = true;
1663
1664                         /*
1665                          * for ep0: maxP defined in desc, for other
1666                          * eps, maxP is set by epautoconfig() called
1667                          * by gadget layer
1668                          */
1669                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1670
1671                         INIT_LIST_HEAD(&hwep->qh.queue);
1672                         hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1673                                                      &hwep->qh.dma);
1674                         if (hwep->qh.ptr == NULL)
1675                                 retval = -ENOMEM;
1676                         else
1677                                 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1678
1679                         /*
1680                          * set up shorthands for ep0 out and in endpoints,
1681                          * don't add to gadget's ep_list
1682                          */
1683                         if (i == 0) {
1684                                 if (j == RX)
1685                                         ci->ep0out = hwep;
1686                                 else
1687                                         ci->ep0in = hwep;
1688
1689                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1690                                 continue;
1691                         }
1692
1693                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1694                 }
1695
1696         return retval;
1697 }
1698
1699 static void destroy_eps(struct ci_hdrc *ci)
1700 {
1701         int i;
1702
1703         for (i = 0; i < ci->hw_ep_max; i++) {
1704                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1705
1706                 if (hwep->pending_td)
1707                         free_pending_td(hwep);
1708                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1709         }
1710 }
1711
1712 /**
1713  * ci_udc_start: register a gadget driver
1714  * @gadget: our gadget
1715  * @driver: the driver being registered
1716  *
1717  * Interrupts are enabled here.
1718  */
1719 static int ci_udc_start(struct usb_gadget *gadget,
1720                          struct usb_gadget_driver *driver)
1721 {
1722         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1723         unsigned long flags;
1724         int retval = -ENOMEM;
1725
1726         if (driver->disconnect == NULL)
1727                 return -EINVAL;
1728
1729
1730         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1731         retval = usb_ep_enable(&ci->ep0out->ep);
1732         if (retval)
1733                 return retval;
1734
1735         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1736         retval = usb_ep_enable(&ci->ep0in->ep);
1737         if (retval)
1738                 return retval;
1739
1740         ci->driver = driver;
1741
1742         /* Start otg fsm for B-device */
1743         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1744                 ci_hdrc_otg_fsm_start(ci);
1745                 return retval;
1746         }
1747
1748         pm_runtime_get_sync(&ci->gadget.dev);
1749         if (ci->vbus_active) {
1750                 spin_lock_irqsave(&ci->lock, flags);
1751                 hw_device_reset(ci);
1752         } else {
1753                 usb_udc_vbus_handler(&ci->gadget, false);
1754                 pm_runtime_put_sync(&ci->gadget.dev);
1755                 return retval;
1756         }
1757
1758         retval = hw_device_state(ci, ci->ep0out->qh.dma);
1759         spin_unlock_irqrestore(&ci->lock, flags);
1760         if (retval)
1761                 pm_runtime_put_sync(&ci->gadget.dev);
1762
1763         return retval;
1764 }
1765
1766 /**
1767  * ci_udc_stop: unregister a gadget driver
1768  */
1769 static int ci_udc_stop(struct usb_gadget *gadget)
1770 {
1771         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1772         unsigned long flags;
1773
1774         spin_lock_irqsave(&ci->lock, flags);
1775
1776         if (ci->vbus_active) {
1777                 hw_device_state(ci, 0);
1778                 if (ci->platdata->notify_event)
1779                         ci->platdata->notify_event(ci,
1780                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1781                 spin_unlock_irqrestore(&ci->lock, flags);
1782                 _gadget_stop_activity(&ci->gadget);
1783                 spin_lock_irqsave(&ci->lock, flags);
1784                 pm_runtime_put(&ci->gadget.dev);
1785         }
1786
1787         ci->driver = NULL;
1788         spin_unlock_irqrestore(&ci->lock, flags);
1789
1790         return 0;
1791 }
1792
1793 /******************************************************************************
1794  * BUS block
1795  *****************************************************************************/
1796 /**
1797  * udc_irq: ci interrupt handler
1798  *
1799  * This function returns IRQ_HANDLED if the IRQ has been handled
1800  * It locks access to registers
1801  */
1802 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1803 {
1804         irqreturn_t retval;
1805         u32 intr;
1806
1807         if (ci == NULL)
1808                 return IRQ_HANDLED;
1809
1810         spin_lock(&ci->lock);
1811
1812         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1813                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1814                                 USBMODE_CM_DC) {
1815                         spin_unlock(&ci->lock);
1816                         return IRQ_NONE;
1817                 }
1818         }
1819         intr = hw_test_and_clear_intr_active(ci);
1820
1821         if (intr) {
1822                 /* order defines priority - do NOT change it */
1823                 if (USBi_URI & intr)
1824                         isr_reset_handler(ci);
1825
1826                 if (USBi_PCI & intr) {
1827                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
1828                                 USB_SPEED_HIGH : USB_SPEED_FULL;
1829                         if (ci->suspended && ci->driver->resume) {
1830                                 spin_unlock(&ci->lock);
1831                                 ci->driver->resume(&ci->gadget);
1832                                 spin_lock(&ci->lock);
1833                                 ci->suspended = 0;
1834                         }
1835                 }
1836
1837                 if (USBi_UI  & intr)
1838                         isr_tr_complete_handler(ci);
1839
1840                 if (USBi_SLI & intr) {
1841                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1842                             ci->driver->suspend) {
1843                                 ci->suspended = 1;
1844                                 spin_unlock(&ci->lock);
1845                                 ci->driver->suspend(&ci->gadget);
1846                                 usb_gadget_set_state(&ci->gadget,
1847                                                 USB_STATE_SUSPENDED);
1848                                 spin_lock(&ci->lock);
1849                         }
1850                 }
1851                 retval = IRQ_HANDLED;
1852         } else {
1853                 retval = IRQ_NONE;
1854         }
1855         spin_unlock(&ci->lock);
1856
1857         return retval;
1858 }
1859
1860 /**
1861  * udc_start: initialize gadget role
1862  * @ci: chipidea controller
1863  */
1864 static int udc_start(struct ci_hdrc *ci)
1865 {
1866         struct device *dev = ci->dev;
1867         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1868         int retval = 0;
1869
1870         spin_lock_init(&ci->lock);
1871
1872         ci->gadget.ops          = &usb_gadget_ops;
1873         ci->gadget.speed        = USB_SPEED_UNKNOWN;
1874         ci->gadget.max_speed    = USB_SPEED_HIGH;
1875         ci->gadget.name         = ci->platdata->name;
1876         ci->gadget.otg_caps     = otg_caps;
1877
1878         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1879                                                 otg_caps->adp_support))
1880                 ci->gadget.is_otg = 1;
1881
1882         INIT_LIST_HEAD(&ci->gadget.ep_list);
1883
1884         /* alloc resources */
1885         ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1886                                        sizeof(struct ci_hw_qh),
1887                                        64, CI_HDRC_PAGE_SIZE);
1888         if (ci->qh_pool == NULL)
1889                 return -ENOMEM;
1890
1891         ci->td_pool = dma_pool_create("ci_hw_td", dev,
1892                                        sizeof(struct ci_hw_td),
1893                                        64, CI_HDRC_PAGE_SIZE);
1894         if (ci->td_pool == NULL) {
1895                 retval = -ENOMEM;
1896                 goto free_qh_pool;
1897         }
1898
1899         retval = init_eps(ci);
1900         if (retval)
1901                 goto free_pools;
1902
1903         ci->gadget.ep0 = &ci->ep0in->ep;
1904
1905         retval = usb_add_gadget_udc(dev, &ci->gadget);
1906         if (retval)
1907                 goto destroy_eps;
1908
1909         pm_runtime_no_callbacks(&ci->gadget.dev);
1910         pm_runtime_enable(&ci->gadget.dev);
1911
1912         return retval;
1913
1914 destroy_eps:
1915         destroy_eps(ci);
1916 free_pools:
1917         dma_pool_destroy(ci->td_pool);
1918 free_qh_pool:
1919         dma_pool_destroy(ci->qh_pool);
1920         return retval;
1921 }
1922
1923 /**
1924  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1925  *
1926  * No interrupts active, the IRQ has been released
1927  */
1928 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1929 {
1930         if (!ci->roles[CI_ROLE_GADGET])
1931                 return;
1932
1933         usb_del_gadget_udc(&ci->gadget);
1934
1935         destroy_eps(ci);
1936
1937         dma_pool_destroy(ci->td_pool);
1938         dma_pool_destroy(ci->qh_pool);
1939 }
1940
1941 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1942 {
1943         if (ci->is_otg)
1944                 /* Clear and enable BSV irq */
1945                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1946                                         OTGSC_BSVIS | OTGSC_BSVIE);
1947
1948         return 0;
1949 }
1950
1951 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1952 {
1953         /*
1954          * host doesn't care B_SESSION_VALID event
1955          * so clear and disbale BSV irq
1956          */
1957         if (ci->is_otg)
1958                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1959 }
1960
1961 /**
1962  * ci_hdrc_gadget_init - initialize device related bits
1963  * ci: the controller
1964  *
1965  * This function initializes the gadget, if the device is "device capable".
1966  */
1967 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1968 {
1969         struct ci_role_driver *rdrv;
1970
1971         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1972                 return -ENXIO;
1973
1974         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1975         if (!rdrv)
1976                 return -ENOMEM;
1977
1978         rdrv->start     = udc_id_switch_for_device;
1979         rdrv->stop      = udc_id_switch_for_host;
1980         rdrv->irq       = udc_irq;
1981         rdrv->name      = "gadget";
1982         ci->roles[CI_ROLE_GADGET] = rdrv;
1983
1984         return udc_start(ci);
1985 }