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 == TX) ? 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_write(ci, OP_ENDPTCTRL + num,
 125                  (dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 126         return 0;
 127 }
 128
 129 /**
 130  * hw_ep_enable: enables endpoint (execute without interruption)
 131  * @num:  endpoint number
 132  * @dir:  endpoint direction
 133  * @type: endpoint type
 134  *
 135  * This function returns an error code
 136  */
 137 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
 138 {
 139         u32 mask, data;
 140
 141         if (dir == TX) {
 142                 mask  = ENDPTCTRL_TXT;  /* type    */
 143                 data  = type << __ffs(mask);
 144
 145                 mask |= ENDPTCTRL_TXS;  /* unstall */
 146                 mask |= ENDPTCTRL_TXR;  /* reset data toggle */
 147                 data |= ENDPTCTRL_TXR;
 148                 mask |= ENDPTCTRL_TXE;  /* enable  */
 149                 data |= ENDPTCTRL_TXE;
 150         } else {
 151                 mask  = ENDPTCTRL_RXT;  /* type    */
 152                 data  = type << __ffs(mask);
 153
 154                 mask |= ENDPTCTRL_RXS;  /* unstall */
 155                 mask |= ENDPTCTRL_RXR;  /* reset data toggle */
 156                 data |= ENDPTCTRL_RXR;
 157                 mask |= ENDPTCTRL_RXE;  /* enable  */
 158                 data |= ENDPTCTRL_RXE;
 159         }
 160         hw_write(ci, OP_ENDPTCTRL + num, mask, data);
 161         return 0;
 162 }
 163
 164 /**
 165  * hw_ep_get_halt: return endpoint halt status
 166  * @num: endpoint number
 167  * @dir: endpoint direction
 168  *
 169  * This function returns 1 if endpoint halted
 170  */
 171 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
 172 {
 173         u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 174
 175         return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
 176 }
 177
 178 /**
 179  * hw_ep_prime: primes endpoint (execute without interruption)
 180  * @num:     endpoint number
 181  * @dir:     endpoint direction
 182  * @is_ctrl: true if control endpoint
 183  *
 184  * This function returns an error code
 185  */
 186 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
 187 {
 188         int n = hw_ep_bit(num, dir);
 189
 190         /* Synchronize before ep prime */
 191         wmb();
 192
 193         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 194                 return -EAGAIN;
 195
 196         hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
 197
 198         while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 199                 cpu_relax();
 200         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 201                 return -EAGAIN;
 202
 203         /* status shoult be tested according with manual but it doesn't work */
 204         return 0;
 205 }
 206
 207 /**
 208  * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
 209  *                 without interruption)
 210  * @num:   endpoint number
 211  * @dir:   endpoint direction
 212  * @value: true => stall, false => unstall
 213  *
 214  * This function returns an error code
 215  */
 216 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
 217 {
 218         if (value != 0 && value != 1)
 219                 return -EINVAL;
 220
 221         do {
 222                 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
 223                 u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 224                 u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
 225
 226                 /* data toggle - reserved for EP0 but it's in ESS */
 227                 hw_write(ci, reg, mask_xs|mask_xr,
 228                           value ? mask_xs : mask_xr);
 229         } while (value != hw_ep_get_halt(ci, num, dir));
 230
 231         return 0;
 232 }
 233
 234 /**
 235  * hw_is_port_high_speed: test if port is high speed
 236  *
 237  * This function returns true if high speed port
 238  */
 239 static int hw_port_is_high_speed(struct ci_hdrc *ci)
 240 {
 241         return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
 242                 hw_read(ci, OP_PORTSC, PORTSC_HSP);
 243 }
 244
 245 /**
 246  * hw_test_and_clear_complete: test & clear complete status (execute without
 247  *                             interruption)
 248  * @n: endpoint number
 249  *
 250  * This function returns complete status
 251  */
 252 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
 253 {
 254         n = ep_to_bit(ci, n);
 255         return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
 256 }
 257
 258 /**
 259  * hw_test_and_clear_intr_active: test & clear active interrupts (execute
 260  *                                without interruption)
 261  *
 262  * This function returns active interrutps
 263  */
 264 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
 265 {
 266         u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
 267
 268         hw_write(ci, OP_USBSTS, ~0, reg);
 269         return reg;
 270 }
 271
 272 /**
 273  * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
 274  *                                interruption)
 275  *
 276  * This function returns guard value
 277  */
 278 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
 279 {
 280         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
 281 }
 282
 283 /**
 284  * hw_test_and_set_setup_guard: test & set setup guard (execute without
 285  *                              interruption)
 286  *
 287  * This function returns guard value
 288  */
 289 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
 290 {
 291         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
 292 }
 293
 294 /**
 295  * hw_usb_set_address: configures USB address (execute without interruption)
 296  * @value: new USB address
 297  *
 298  * This function explicitly sets the address, without the "USBADRA" (advance)
 299  * feature, which is not supported by older versions of the controller.
 300  */
 301 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
 302 {
 303         hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
 304                  value << __ffs(DEVICEADDR_USBADR));
 305 }
 306
 307 /**
 308  * hw_usb_reset: restart device after a bus reset (execute without
 309  *               interruption)
 310  *
 311  * This function returns an error code
 312  */
 313 static int hw_usb_reset(struct ci_hdrc *ci)
 314 {
 315         hw_usb_set_address(ci, 0);
 316
 317         /* ESS flushes only at end?!? */
 318         hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
 319
 320         /* clear setup token semaphores */
 321         hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
 322
 323         /* clear complete status */
 324         hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
 325
 326         /* wait until all bits cleared */
 327         while (hw_read(ci, OP_ENDPTPRIME, ~0))
 328                 udelay(10);             /* not RTOS friendly */
 329
 330         /* reset all endpoints ? */
 331
 332         /* reset internal status and wait for further instructions
 333            no need to verify the port reset status (ESS does it) */
 334
 335         return 0;
 336 }
 337
 338 /******************************************************************************
 339  * UTIL block
 340  *****************************************************************************/
 341
 342 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 343                           unsigned length)
 344 {
 345         int i;
 346         u32 temp;
 347         struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
 348                                                   GFP_ATOMIC);
 349
 350         if (node == NULL)
 351                 return -ENOMEM;
 352
 353         node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma);
 354         if (node->ptr == NULL) {
 355                 kfree(node);
 356                 return -ENOMEM;
 357         }
 358
 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 |= cpu_to_le32(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_by_dev(ci->dev->parent,
 427                                             &hwreq->req, hwep->dir);
 428         if (ret)
 429                 return ret;
 430
 431         /*
 432          * The first buffer could be not page aligned.
 433          * In that case we have to span into one extra td.
 434          */
 435         if (hwreq->req.dma % PAGE_SIZE)
 436                 pages--;
 437
 438         if (rest == 0) {
 439                 ret = add_td_to_list(hwep, hwreq, 0);
 440                 if (ret < 0)
 441                         goto done;
 442         }
 443
 444         while (rest > 0) {
 445                 unsigned count = min(hwreq->req.length - hwreq->req.actual,
 446                                         (unsigned)(pages * CI_HDRC_PAGE_SIZE));
 447                 ret = add_td_to_list(hwep, hwreq, count);
 448                 if (ret < 0)
 449                         goto done;
 450
 451                 rest -= count;
 452         }
 453
 454         if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
 455             && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
 456                 ret = add_td_to_list(hwep, hwreq, 0);
 457                 if (ret < 0)
 458                         goto done;
 459         }
 460
 461         firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 462
 463         lastnode = list_entry(hwreq->tds.prev,
 464                 struct td_node, td);
 465
 466         lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
 467         if (!hwreq->req.no_interrupt)
 468                 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
 469         wmb();
 470
 471         hwreq->req.actual = 0;
 472         if (!list_empty(&hwep->qh.queue)) {
 473                 struct ci_hw_req *hwreqprev;
 474                 int n = hw_ep_bit(hwep->num, hwep->dir);
 475                 int tmp_stat;
 476                 struct td_node *prevlastnode;
 477                 u32 next = firstnode->dma & TD_ADDR_MASK;
 478
 479                 hwreqprev = list_entry(hwep->qh.queue.prev,
 480                                 struct ci_hw_req, queue);
 481                 prevlastnode = list_entry(hwreqprev->tds.prev,
 482                                 struct td_node, td);
 483
 484                 prevlastnode->ptr->next = cpu_to_le32(next);
 485                 wmb();
 486                 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 487                         goto done;
 488                 do {
 489                         hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
 490                         tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
 491                 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
 492                 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
 493                 if (tmp_stat)
 494                         goto done;
 495         }
 496
 497         /*  QH configuration */
 498         hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
 499         hwep->qh.ptr->td.token &=
 500                 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
 501
 502         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
 503                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 504
 505                 if (hwreq->req.length == 0
 506                                 || hwreq->req.length % hwep->ep.maxpacket)
 507                         mul++;
 508                 hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT));
 509         }
 510
 511         ret = hw_ep_prime(ci, hwep->num, hwep->dir,
 512                            hwep->type == USB_ENDPOINT_XFER_CONTROL);
 513 done:
 514         return ret;
 515 }
 516
 517 /*
 518  * free_pending_td: remove a pending request for the endpoint
 519  * @hwep: endpoint
 520  */
 521 static void free_pending_td(struct ci_hw_ep *hwep)
 522 {
 523         struct td_node *pending = hwep->pending_td;
 524
 525         dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
 526         hwep->pending_td = NULL;
 527         kfree(pending);
 528 }
 529
 530 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
 531                                            struct td_node *node)
 532 {
 533         hwep->qh.ptr->td.next = cpu_to_le32(node->dma);
 534         hwep->qh.ptr->td.token &=
 535                 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
 536
 537         return hw_ep_prime(ci, hwep->num, hwep->dir,
 538                                 hwep->type == USB_ENDPOINT_XFER_CONTROL);
 539 }
 540
 541 /**
 542  * _hardware_dequeue: handles a request at hardware level
 543  * @gadget: gadget
 544  * @hwep:   endpoint
 545  *
 546  * This function returns an error code
 547  */
 548 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 549 {
 550         u32 tmptoken;
 551         struct td_node *node, *tmpnode;
 552         unsigned remaining_length;
 553         unsigned actual = hwreq->req.length;
 554         struct ci_hdrc *ci = hwep->ci;
 555
 556         if (hwreq->req.status != -EALREADY)
 557                 return -EINVAL;
 558
 559         hwreq->req.status = 0;
 560
 561         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 562                 tmptoken = le32_to_cpu(node->ptr->token);
 563                 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
 564                         int n = hw_ep_bit(hwep->num, hwep->dir);
 565
 566                         if (ci->rev == CI_REVISION_24)
 567                                 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 568                                         reprime_dtd(ci, hwep, node);
 569                         hwreq->req.status = -EALREADY;
 570                         return -EBUSY;
 571                 }
 572
 573                 remaining_length = (tmptoken & TD_TOTAL_BYTES);
 574                 remaining_length >>= __ffs(TD_TOTAL_BYTES);
 575                 actual -= remaining_length;
 576
 577                 hwreq->req.status = tmptoken & TD_STATUS;
 578                 if ((TD_STATUS_HALTED & hwreq->req.status)) {
 579                         hwreq->req.status = -EPIPE;
 580                         break;
 581                 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
 582                         hwreq->req.status = -EPROTO;
 583                         break;
 584                 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
 585                         hwreq->req.status = -EILSEQ;
 586                         break;
 587                 }
 588
 589                 if (remaining_length) {
 590                         if (hwep->dir == TX) {
 591                                 hwreq->req.status = -EPROTO;
 592                                 break;
 593                         }
 594                 }
 595                 /*
 596                  * As the hardware could still address the freed td
 597                  * which will run the udc unusable, the cleanup of the
 598                  * td has to be delayed by one.
 599                  */
 600                 if (hwep->pending_td)
 601                         free_pending_td(hwep);
 602
 603                 hwep->pending_td = node;
 604                 list_del_init(&node->td);
 605         }
 606
 607         usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
 608                                         &hwreq->req, hwep->dir);
 609
 610         hwreq->req.actual += actual;
 611
 612         if (hwreq->req.status)
 613                 return hwreq->req.status;
 614
 615         return hwreq->req.actual;
 616 }
 617
 618 /**
 619  * _ep_nuke: dequeues all endpoint requests
 620  * @hwep: endpoint
 621  *
 622  * This function returns an error code
 623  * Caller must hold lock
 624  */
 625 static int _ep_nuke(struct ci_hw_ep *hwep)
 626 __releases(hwep->lock)
 627 __acquires(hwep->lock)
 628 {
 629         struct td_node *node, *tmpnode;
 630         if (hwep == NULL)
 631                 return -EINVAL;
 632
 633         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
 634
 635         while (!list_empty(&hwep->qh.queue)) {
 636
 637                 /* pop oldest request */
 638                 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
 639                                                      struct ci_hw_req, queue);
 640
 641                 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 642                         dma_pool_free(hwep->td_pool, node->ptr, node->dma);
 643                         list_del_init(&node->td);
 644                         node->ptr = NULL;
 645                         kfree(node);
 646                 }
 647
 648                 list_del_init(&hwreq->queue);
 649                 hwreq->req.status = -ESHUTDOWN;
 650
 651                 if (hwreq->req.complete != NULL) {
 652                         spin_unlock(hwep->lock);
 653                         usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
 654                         spin_lock(hwep->lock);
 655                 }
 656         }
 657
 658         if (hwep->pending_td)
 659                 free_pending_td(hwep);
 660
 661         return 0;
 662 }
 663
 664 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
 665 {
 666         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
 667         int direction, retval = 0;
 668         unsigned long flags;
 669
 670         if (ep == NULL || hwep->ep.desc == NULL)
 671                 return -EINVAL;
 672
 673         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
 674                 return -EOPNOTSUPP;
 675
 676         spin_lock_irqsave(hwep->lock, flags);
 677
 678         if (value && hwep->dir == TX && check_transfer &&
 679                 !list_empty(&hwep->qh.queue) &&
 680                         !usb_endpoint_xfer_control(hwep->ep.desc)) {
 681                 spin_unlock_irqrestore(hwep->lock, flags);
 682                 return -EAGAIN;
 683         }
 684
 685         direction = hwep->dir;
 686         do {
 687                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
 688
 689                 if (!value)
 690                         hwep->wedge = 0;
 691
 692                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
 693                         hwep->dir = (hwep->dir == TX) ? RX : TX;
 694
 695         } while (hwep->dir != direction);
 696
 697         spin_unlock_irqrestore(hwep->lock, flags);
 698         return retval;
 699 }
 700
 701
 702 /**
 703  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 704  * @gadget: gadget
 705  *
 706  * This function returns an error code
 707  */
 708 static int _gadget_stop_activity(struct usb_gadget *gadget)
 709 {
 710         struct usb_ep *ep;
 711         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 712         unsigned long flags;
 713
 714         spin_lock_irqsave(&ci->lock, flags);
 715         ci->gadget.speed = USB_SPEED_UNKNOWN;
 716         ci->remote_wakeup = 0;
 717         ci->suspended = 0;
 718         spin_unlock_irqrestore(&ci->lock, flags);
 719
 720         /* flush all endpoints */
 721         gadget_for_each_ep(ep, gadget) {
 722                 usb_ep_fifo_flush(ep);
 723         }
 724         usb_ep_fifo_flush(&ci->ep0out->ep);
 725         usb_ep_fifo_flush(&ci->ep0in->ep);
 726
 727         /* make sure to disable all endpoints */
 728         gadget_for_each_ep(ep, gadget) {
 729                 usb_ep_disable(ep);
 730         }
 731
 732         if (ci->status != NULL) {
 733                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 734                 ci->status = NULL;
 735         }
 736
 737         return 0;
 738 }
 739
 740 /******************************************************************************
 741  * ISR block
 742  *****************************************************************************/
 743 /**
 744  * isr_reset_handler: USB reset interrupt handler
 745  * @ci: UDC device
 746  *
 747  * This function resets USB engine after a bus reset occurred
 748  */
 749 static void isr_reset_handler(struct ci_hdrc *ci)
 750 __releases(ci->lock)
 751 __acquires(ci->lock)
 752 {
 753         int retval;
 754
 755         spin_unlock(&ci->lock);
 756         if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 757                 usb_gadget_udc_reset(&ci->gadget, ci->driver);
 758
 759         retval = _gadget_stop_activity(&ci->gadget);
 760         if (retval)
 761                 goto done;
 762
 763         retval = hw_usb_reset(ci);
 764         if (retval)
 765                 goto done;
 766
 767         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 768         if (ci->status == NULL)
 769                 retval = -ENOMEM;
 770
 771 done:
 772         spin_lock(&ci->lock);
 773
 774         if (retval)
 775                 dev_err(ci->dev, "error: %i\n", retval);
 776 }
 777
 778 /**
 779  * isr_get_status_complete: get_status request complete function
 780  * @ep:  endpoint
 781  * @req: request handled
 782  *
 783  * Caller must release lock
 784  */
 785 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 786 {
 787         if (ep == NULL || req == NULL)
 788                 return;
 789
 790         kfree(req->buf);
 791         usb_ep_free_request(ep, req);
 792 }
 793
 794 /**
 795  * _ep_queue: queues (submits) an I/O request to an endpoint
 796  * @ep:        endpoint
 797  * @req:       request
 798  * @gfp_flags: GFP flags (not used)
 799  *
 800  * Caller must hold lock
 801  * This function returns an error code
 802  */
 803 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 804                     gfp_t __maybe_unused gfp_flags)
 805 {
 806         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 807         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 808         struct ci_hdrc *ci = hwep->ci;
 809         int retval = 0;
 810
 811         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 812                 return -EINVAL;
 813
 814         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 815                 if (req->length)
 816                         hwep = (ci->ep0_dir == RX) ?
 817                                ci->ep0out : ci->ep0in;
 818                 if (!list_empty(&hwep->qh.queue)) {
 819                         _ep_nuke(hwep);
 820                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 821                                  _usb_addr(hwep));
 822                 }
 823         }
 824
 825         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 826             hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
 827                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 828                 return -EMSGSIZE;
 829         }
 830
 831         /* first nuke then test link, e.g. previous status has not sent */
 832         if (!list_empty(&hwreq->queue)) {
 833                 dev_err(hwep->ci->dev, "request already in queue\n");
 834                 return -EBUSY;
 835         }
 836
 837         /* push request */
 838         hwreq->req.status = -EINPROGRESS;
 839         hwreq->req.actual = 0;
 840
 841         retval = _hardware_enqueue(hwep, hwreq);
 842
 843         if (retval == -EALREADY)
 844                 retval = 0;
 845         if (!retval)
 846                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
 847
 848         return retval;
 849 }
 850
 851 /**
 852  * isr_get_status_response: get_status request response
 853  * @ci: ci struct
 854  * @setup: setup request packet
 855  *
 856  * This function returns an error code
 857  */
 858 static int isr_get_status_response(struct ci_hdrc *ci,
 859                                    struct usb_ctrlrequest *setup)
 860 __releases(hwep->lock)
 861 __acquires(hwep->lock)
 862 {
 863         struct ci_hw_ep *hwep = ci->ep0in;
 864         struct usb_request *req = NULL;
 865         gfp_t gfp_flags = GFP_ATOMIC;
 866         int dir, num, retval;
 867
 868         if (hwep == NULL || setup == NULL)
 869                 return -EINVAL;
 870
 871         spin_unlock(hwep->lock);
 872         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 873         spin_lock(hwep->lock);
 874         if (req == NULL)
 875                 return -ENOMEM;
 876
 877         req->complete = isr_get_status_complete;
 878         req->length   = 2;
 879         req->buf      = kzalloc(req->length, gfp_flags);
 880         if (req->buf == NULL) {
 881                 retval = -ENOMEM;
 882                 goto err_free_req;
 883         }
 884
 885         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
 886                 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
 887                         ci->gadget.is_selfpowered;
 888         } else if ((setup->bRequestType & USB_RECIP_MASK) \
 889                    == USB_RECIP_ENDPOINT) {
 890                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
 891                         TX : RX;
 892                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 893                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
 894         }
 895         /* else do nothing; reserved for future use */
 896
 897         retval = _ep_queue(&hwep->ep, req, gfp_flags);
 898         if (retval)
 899                 goto err_free_buf;
 900
 901         return 0;
 902
 903  err_free_buf:
 904         kfree(req->buf);
 905  err_free_req:
 906         spin_unlock(hwep->lock);
 907         usb_ep_free_request(&hwep->ep, req);
 908         spin_lock(hwep->lock);
 909         return retval;
 910 }
 911
 912 /**
 913  * isr_setup_status_complete: setup_status request complete function
 914  * @ep:  endpoint
 915  * @req: request handled
 916  *
 917  * Caller must release lock. Put the port in test mode if test mode
 918  * feature is selected.
 919  */
 920 static void
 921 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
 922 {
 923         struct ci_hdrc *ci = req->context;
 924         unsigned long flags;
 925
 926         if (ci->setaddr) {
 927                 hw_usb_set_address(ci, ci->address);
 928                 ci->setaddr = false;
 929                 if (ci->address)
 930                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
 931         }
 932
 933         spin_lock_irqsave(&ci->lock, flags);
 934         if (ci->test_mode)
 935                 hw_port_test_set(ci, ci->test_mode);
 936         spin_unlock_irqrestore(&ci->lock, flags);
 937 }
 938
 939 /**
 940  * isr_setup_status_phase: queues the status phase of a setup transation
 941  * @ci: ci struct
 942  *
 943  * This function returns an error code
 944  */
 945 static int isr_setup_status_phase(struct ci_hdrc *ci)
 946 {
 947         int retval;
 948         struct ci_hw_ep *hwep;
 949
 950         /*
 951          * Unexpected USB controller behavior, caused by bad signal integrity
 952          * or ground reference problems, can lead to isr_setup_status_phase
 953          * being called with ci->status equal to NULL.
 954          * If this situation occurs, you should review your USB hardware design.
 955          */
 956         if (WARN_ON_ONCE(!ci->status))
 957                 return -EPIPE;
 958
 959         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
 960         ci->status->context = ci;
 961         ci->status->complete = isr_setup_status_complete;
 962
 963         retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
 964
 965         return retval;
 966 }
 967
 968 /**
 969  * isr_tr_complete_low: transaction complete low level handler
 970  * @hwep: endpoint
 971  *
 972  * This function returns an error code
 973  * Caller must hold lock
 974  */
 975 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
 976 __releases(hwep->lock)
 977 __acquires(hwep->lock)
 978 {
 979         struct ci_hw_req *hwreq, *hwreqtemp;
 980         struct ci_hw_ep *hweptemp = hwep;
 981         int retval = 0;
 982
 983         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
 984                         queue) {
 985                 retval = _hardware_dequeue(hwep, hwreq);
 986                 if (retval < 0)
 987                         break;
 988                 list_del_init(&hwreq->queue);
 989                 if (hwreq->req.complete != NULL) {
 990                         spin_unlock(hwep->lock);
 991                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
 992                                         hwreq->req.length)
 993                                 hweptemp = hwep->ci->ep0in;
 994                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
 995                         spin_lock(hwep->lock);
 996                 }
 997         }
 998
 999         if (retval == -EBUSY)
1000                 retval = 0;
1001
1002         return retval;
1003 }
1004
1005 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1006 {
1007         dev_warn(&ci->gadget.dev,
1008                 "connect the device to an alternate port if you want HNP\n");
1009         return isr_setup_status_phase(ci);
1010 }
1011
1012 /**
1013  * isr_setup_packet_handler: setup packet handler
1014  * @ci: UDC descriptor
1015  *
1016  * This function handles setup packet
1017  */
1018 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1019 __releases(ci->lock)
1020 __acquires(ci->lock)
1021 {
1022         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1023         struct usb_ctrlrequest req;
1024         int type, num, dir, err = -EINVAL;
1025         u8 tmode = 0;
1026
1027         /*
1028          * Flush data and handshake transactions of previous
1029          * setup packet.
1030          */
1031         _ep_nuke(ci->ep0out);
1032         _ep_nuke(ci->ep0in);
1033
1034         /* read_setup_packet */
1035         do {
1036                 hw_test_and_set_setup_guard(ci);
1037                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1038         } while (!hw_test_and_clear_setup_guard(ci));
1039
1040         type = req.bRequestType;
1041
1042         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1043
1044         switch (req.bRequest) {
1045         case USB_REQ_CLEAR_FEATURE:
1046                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1047                                 le16_to_cpu(req.wValue) ==
1048                                 USB_ENDPOINT_HALT) {
1049                         if (req.wLength != 0)
1050                                 break;
1051                         num  = le16_to_cpu(req.wIndex);
1052                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1053                         num &= USB_ENDPOINT_NUMBER_MASK;
1054                         if (dir == TX)
1055                                 num += ci->hw_ep_max / 2;
1056                         if (!ci->ci_hw_ep[num].wedge) {
1057                                 spin_unlock(&ci->lock);
1058                                 err = usb_ep_clear_halt(
1059                                         &ci->ci_hw_ep[num].ep);
1060                                 spin_lock(&ci->lock);
1061                                 if (err)
1062                                         break;
1063                         }
1064                         err = isr_setup_status_phase(ci);
1065                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1066                                 le16_to_cpu(req.wValue) ==
1067                                 USB_DEVICE_REMOTE_WAKEUP) {
1068                         if (req.wLength != 0)
1069                                 break;
1070                         ci->remote_wakeup = 0;
1071                         err = isr_setup_status_phase(ci);
1072                 } else {
1073                         goto delegate;
1074                 }
1075                 break;
1076         case USB_REQ_GET_STATUS:
1077                 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1078                         le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1079                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1080                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1081                         goto delegate;
1082                 if (le16_to_cpu(req.wLength) != 2 ||
1083                     le16_to_cpu(req.wValue)  != 0)
1084                         break;
1085                 err = isr_get_status_response(ci, &req);
1086                 break;
1087         case USB_REQ_SET_ADDRESS:
1088                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1089                         goto delegate;
1090                 if (le16_to_cpu(req.wLength) != 0 ||
1091                     le16_to_cpu(req.wIndex)  != 0)
1092                         break;
1093                 ci->address = (u8)le16_to_cpu(req.wValue);
1094                 ci->setaddr = true;
1095                 err = isr_setup_status_phase(ci);
1096                 break;
1097         case USB_REQ_SET_FEATURE:
1098                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1099                                 le16_to_cpu(req.wValue) ==
1100                                 USB_ENDPOINT_HALT) {
1101                         if (req.wLength != 0)
1102                                 break;
1103                         num  = le16_to_cpu(req.wIndex);
1104                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1105                         num &= USB_ENDPOINT_NUMBER_MASK;
1106                         if (dir == TX)
1107                                 num += ci->hw_ep_max / 2;
1108
1109                         spin_unlock(&ci->lock);
1110                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1111                         spin_lock(&ci->lock);
1112                         if (!err)
1113                                 isr_setup_status_phase(ci);
1114                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1115                         if (req.wLength != 0)
1116                                 break;
1117                         switch (le16_to_cpu(req.wValue)) {
1118                         case USB_DEVICE_REMOTE_WAKEUP:
1119                                 ci->remote_wakeup = 1;
1120                                 err = isr_setup_status_phase(ci);
1121                                 break;
1122                         case USB_DEVICE_TEST_MODE:
1123                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1124                                 switch (tmode) {
1125                                 case TEST_J:
1126                                 case TEST_K:
1127                                 case TEST_SE0_NAK:
1128                                 case TEST_PACKET:
1129                                 case TEST_FORCE_EN:
1130                                         ci->test_mode = tmode;
1131                                         err = isr_setup_status_phase(
1132                                                         ci);
1133                                         break;
1134                                 default:
1135                                         break;
1136                                 }
1137                                 break;
1138                         case USB_DEVICE_B_HNP_ENABLE:
1139                                 if (ci_otg_is_fsm_mode(ci)) {
1140                                         ci->gadget.b_hnp_enable = 1;
1141                                         err = isr_setup_status_phase(
1142                                                         ci);
1143                                 }
1144                                 break;
1145                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1146                                 if (ci_otg_is_fsm_mode(ci))
1147                                         err = otg_a_alt_hnp_support(ci);
1148                                 break;
1149                         case USB_DEVICE_A_HNP_SUPPORT:
1150                                 if (ci_otg_is_fsm_mode(ci)) {
1151                                         ci->gadget.a_hnp_support = 1;
1152                                         err = isr_setup_status_phase(
1153                                                         ci);
1154                                 }
1155                                 break;
1156                         default:
1157                                 goto delegate;
1158                         }
1159                 } else {
1160                         goto delegate;
1161                 }
1162                 break;
1163         default:
1164 delegate:
1165                 if (req.wLength == 0)   /* no data phase */
1166                         ci->ep0_dir = TX;
1167
1168                 spin_unlock(&ci->lock);
1169                 err = ci->driver->setup(&ci->gadget, &req);
1170                 spin_lock(&ci->lock);
1171                 break;
1172         }
1173
1174         if (err < 0) {
1175                 spin_unlock(&ci->lock);
1176                 if (_ep_set_halt(&hwep->ep, 1, false))
1177                         dev_err(ci->dev, "error: _ep_set_halt\n");
1178                 spin_lock(&ci->lock);
1179         }
1180 }
1181
1182 /**
1183  * isr_tr_complete_handler: transaction complete interrupt handler
1184  * @ci: UDC descriptor
1185  *
1186  * This function handles traffic events
1187  */
1188 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1189 __releases(ci->lock)
1190 __acquires(ci->lock)
1191 {
1192         unsigned i;
1193         int err;
1194
1195         for (i = 0; i < ci->hw_ep_max; i++) {
1196                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1197
1198                 if (hwep->ep.desc == NULL)
1199                         continue;   /* not configured */
1200
1201                 if (hw_test_and_clear_complete(ci, i)) {
1202                         err = isr_tr_complete_low(hwep);
1203                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1204                                 if (err > 0)   /* needs status phase */
1205                                         err = isr_setup_status_phase(ci);
1206                                 if (err < 0) {
1207                                         spin_unlock(&ci->lock);
1208                                         if (_ep_set_halt(&hwep->ep, 1, false))
1209                                                 dev_err(ci->dev,
1210                                                 "error: _ep_set_halt\n");
1211                                         spin_lock(&ci->lock);
1212                                 }
1213                         }
1214                 }
1215
1216                 /* Only handle setup packet below */
1217                 if (i == 0 &&
1218                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1219                         isr_setup_packet_handler(ci);
1220         }
1221 }
1222
1223 /******************************************************************************
1224  * ENDPT block
1225  *****************************************************************************/
1226 /**
1227  * ep_enable: configure endpoint, making it usable
1228  *
1229  * Check usb_ep_enable() at "usb_gadget.h" for details
1230  */
1231 static int ep_enable(struct usb_ep *ep,
1232                      const struct usb_endpoint_descriptor *desc)
1233 {
1234         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1235         int retval = 0;
1236         unsigned long flags;
1237         u32 cap = 0;
1238
1239         if (ep == NULL || desc == NULL)
1240                 return -EINVAL;
1241
1242         spin_lock_irqsave(hwep->lock, flags);
1243
1244         /* only internal SW should enable ctrl endpts */
1245
1246         if (!list_empty(&hwep->qh.queue)) {
1247                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1248                 spin_unlock_irqrestore(hwep->lock, flags);
1249                 return -EBUSY;
1250         }
1251
1252         hwep->ep.desc = desc;
1253
1254         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1255         hwep->num  = usb_endpoint_num(desc);
1256         hwep->type = usb_endpoint_type(desc);
1257
1258         hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1259         hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1260
1261         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1262                 cap |= QH_IOS;
1263
1264         cap |= QH_ZLT;
1265         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1266         /*
1267          * For ISO-TX, we set mult at QH as the largest value, and use
1268          * MultO at TD as real mult value.
1269          */
1270         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1271                 cap |= 3 << __ffs(QH_MULT);
1272
1273         hwep->qh.ptr->cap = cpu_to_le32(cap);
1274
1275         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1276
1277         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1278                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1279                 retval = -EINVAL;
1280         }
1281
1282         /*
1283          * Enable endpoints in the HW other than ep0 as ep0
1284          * is always enabled
1285          */
1286         if (hwep->num)
1287                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1288                                        hwep->type);
1289
1290         spin_unlock_irqrestore(hwep->lock, flags);
1291         return retval;
1292 }
1293
1294 /**
1295  * ep_disable: endpoint is no longer usable
1296  *
1297  * Check usb_ep_disable() at "usb_gadget.h" for details
1298  */
1299 static int ep_disable(struct usb_ep *ep)
1300 {
1301         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1302         int direction, retval = 0;
1303         unsigned long flags;
1304
1305         if (ep == NULL)
1306                 return -EINVAL;
1307         else if (hwep->ep.desc == NULL)
1308                 return -EBUSY;
1309
1310         spin_lock_irqsave(hwep->lock, flags);
1311
1312         /* only internal SW should disable ctrl endpts */
1313
1314         direction = hwep->dir;
1315         do {
1316                 retval |= _ep_nuke(hwep);
1317                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1318
1319                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1320                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1321
1322         } while (hwep->dir != direction);
1323
1324         hwep->ep.desc = NULL;
1325
1326         spin_unlock_irqrestore(hwep->lock, flags);
1327         return retval;
1328 }
1329
1330 /**
1331  * ep_alloc_request: allocate a request object to use with this endpoint
1332  *
1333  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1334  */
1335 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1336 {
1337         struct ci_hw_req *hwreq = NULL;
1338
1339         if (ep == NULL)
1340                 return NULL;
1341
1342         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1343         if (hwreq != NULL) {
1344                 INIT_LIST_HEAD(&hwreq->queue);
1345                 INIT_LIST_HEAD(&hwreq->tds);
1346         }
1347
1348         return (hwreq == NULL) ? NULL : &hwreq->req;
1349 }
1350
1351 /**
1352  * ep_free_request: frees a request object
1353  *
1354  * Check usb_ep_free_request() at "usb_gadget.h" for details
1355  */
1356 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1357 {
1358         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1359         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1360         struct td_node *node, *tmpnode;
1361         unsigned long flags;
1362
1363         if (ep == NULL || req == NULL) {
1364                 return;
1365         } else if (!list_empty(&hwreq->queue)) {
1366                 dev_err(hwep->ci->dev, "freeing queued request\n");
1367                 return;
1368         }
1369
1370         spin_lock_irqsave(hwep->lock, flags);
1371
1372         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1373                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1374                 list_del_init(&node->td);
1375                 node->ptr = NULL;
1376                 kfree(node);
1377         }
1378
1379         kfree(hwreq);
1380
1381         spin_unlock_irqrestore(hwep->lock, flags);
1382 }
1383
1384 /**
1385  * ep_queue: queues (submits) an I/O request to an endpoint
1386  *
1387  * Check usb_ep_queue()* at usb_gadget.h" for details
1388  */
1389 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1390                     gfp_t __maybe_unused gfp_flags)
1391 {
1392         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1393         int retval = 0;
1394         unsigned long flags;
1395
1396         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1397                 return -EINVAL;
1398
1399         spin_lock_irqsave(hwep->lock, flags);
1400         retval = _ep_queue(ep, req, gfp_flags);
1401         spin_unlock_irqrestore(hwep->lock, flags);
1402         return retval;
1403 }
1404
1405 /**
1406  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1407  *
1408  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1409  */
1410 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1411 {
1412         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1413         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1414         unsigned long flags;
1415         struct td_node *node, *tmpnode;
1416
1417         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1418                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1419                 list_empty(&hwep->qh.queue))
1420                 return -EINVAL;
1421
1422         spin_lock_irqsave(hwep->lock, flags);
1423
1424         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1425
1426         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1427                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1428                 list_del(&node->td);
1429                 kfree(node);
1430         }
1431
1432         /* pop request */
1433         list_del_init(&hwreq->queue);
1434
1435         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1436
1437         req->status = -ECONNRESET;
1438
1439         if (hwreq->req.complete != NULL) {
1440                 spin_unlock(hwep->lock);
1441                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1442                 spin_lock(hwep->lock);
1443         }
1444
1445         spin_unlock_irqrestore(hwep->lock, flags);
1446         return 0;
1447 }
1448
1449 /**
1450  * ep_set_halt: sets the endpoint halt feature
1451  *
1452  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1453  */
1454 static int ep_set_halt(struct usb_ep *ep, int value)
1455 {
1456         return _ep_set_halt(ep, value, true);
1457 }
1458
1459 /**
1460  * ep_set_wedge: sets the halt feature and ignores clear requests
1461  *
1462  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1463  */
1464 static int ep_set_wedge(struct usb_ep *ep)
1465 {
1466         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1467         unsigned long flags;
1468
1469         if (ep == NULL || hwep->ep.desc == NULL)
1470                 return -EINVAL;
1471
1472         spin_lock_irqsave(hwep->lock, flags);
1473         hwep->wedge = 1;
1474         spin_unlock_irqrestore(hwep->lock, flags);
1475
1476         return usb_ep_set_halt(ep);
1477 }
1478
1479 /**
1480  * ep_fifo_flush: flushes contents of a fifo
1481  *
1482  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1483  */
1484 static void ep_fifo_flush(struct usb_ep *ep)
1485 {
1486         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1487         unsigned long flags;
1488
1489         if (ep == NULL) {
1490                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1491                 return;
1492         }
1493
1494         spin_lock_irqsave(hwep->lock, flags);
1495
1496         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1497
1498         spin_unlock_irqrestore(hwep->lock, flags);
1499 }
1500
1501 /**
1502  * Endpoint-specific part of the API to the USB controller hardware
1503  * Check "usb_gadget.h" for details
1504  */
1505 static const struct usb_ep_ops usb_ep_ops = {
1506         .enable        = ep_enable,
1507         .disable       = ep_disable,
1508         .alloc_request = ep_alloc_request,
1509         .free_request  = ep_free_request,
1510         .queue         = ep_queue,
1511         .dequeue       = ep_dequeue,
1512         .set_halt      = ep_set_halt,
1513         .set_wedge     = ep_set_wedge,
1514         .fifo_flush    = ep_fifo_flush,
1515 };
1516
1517 /******************************************************************************
1518  * GADGET block
1519  *****************************************************************************/
1520 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1521 {
1522         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1523         unsigned long flags;
1524         int gadget_ready = 0;
1525
1526         spin_lock_irqsave(&ci->lock, flags);
1527         ci->vbus_active = is_active;
1528         if (ci->driver)
1529                 gadget_ready = 1;
1530         spin_unlock_irqrestore(&ci->lock, flags);
1531
1532         if (gadget_ready) {
1533                 if (is_active) {
1534                         pm_runtime_get_sync(&_gadget->dev);
1535                         hw_device_reset(ci);
1536                         hw_device_state(ci, ci->ep0out->qh.dma);
1537                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1538                         usb_udc_vbus_handler(_gadget, true);
1539                 } else {
1540                         usb_udc_vbus_handler(_gadget, false);
1541                         if (ci->driver)
1542                                 ci->driver->disconnect(&ci->gadget);
1543                         hw_device_state(ci, 0);
1544                         if (ci->platdata->notify_event)
1545                                 ci->platdata->notify_event(ci,
1546                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1547                         _gadget_stop_activity(&ci->gadget);
1548                         pm_runtime_put_sync(&_gadget->dev);
1549                         usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1550                 }
1551         }
1552
1553         return 0;
1554 }
1555
1556 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1557 {
1558         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1559         unsigned long flags;
1560         int ret = 0;
1561
1562         spin_lock_irqsave(&ci->lock, flags);
1563         if (!ci->remote_wakeup) {
1564                 ret = -EOPNOTSUPP;
1565                 goto out;
1566         }
1567         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1568                 ret = -EINVAL;
1569                 goto out;
1570         }
1571         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1572 out:
1573         spin_unlock_irqrestore(&ci->lock, flags);
1574         return ret;
1575 }
1576
1577 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1578 {
1579         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1580
1581         if (ci->usb_phy)
1582                 return usb_phy_set_power(ci->usb_phy, ma);
1583         return -ENOTSUPP;
1584 }
1585
1586 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1587 {
1588         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1589         struct ci_hw_ep *hwep = ci->ep0in;
1590         unsigned long flags;
1591
1592         spin_lock_irqsave(hwep->lock, flags);
1593         _gadget->is_selfpowered = (is_on != 0);
1594         spin_unlock_irqrestore(hwep->lock, flags);
1595
1596         return 0;
1597 }
1598
1599 /* Change Data+ pullup status
1600  * this func is used by usb_gadget_connect/disconnet
1601  */
1602 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1603 {
1604         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1605
1606         /*
1607          * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1608          * and don't touch Data+ in host mode for dual role config.
1609          */
1610         if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1611                 return 0;
1612
1613         pm_runtime_get_sync(&ci->gadget.dev);
1614         if (is_on)
1615                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1616         else
1617                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1618         pm_runtime_put_sync(&ci->gadget.dev);
1619
1620         return 0;
1621 }
1622
1623 static int ci_udc_start(struct usb_gadget *gadget,
1624                          struct usb_gadget_driver *driver);
1625 static int ci_udc_stop(struct usb_gadget *gadget);
1626 /**
1627  * Device operations part of the API to the USB controller hardware,
1628  * which don't involve endpoints (or i/o)
1629  * Check  "usb_gadget.h" for details
1630  */
1631 static const struct usb_gadget_ops usb_gadget_ops = {
1632         .vbus_session   = ci_udc_vbus_session,
1633         .wakeup         = ci_udc_wakeup,
1634         .set_selfpowered        = ci_udc_selfpowered,
1635         .pullup         = ci_udc_pullup,
1636         .vbus_draw      = ci_udc_vbus_draw,
1637         .udc_start      = ci_udc_start,
1638         .udc_stop       = ci_udc_stop,
1639 };
1640
1641 static int init_eps(struct ci_hdrc *ci)
1642 {
1643         int retval = 0, i, j;
1644
1645         for (i = 0; i < ci->hw_ep_max/2; i++)
1646                 for (j = RX; j <= TX; j++) {
1647                         int k = i + j * ci->hw_ep_max/2;
1648                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1649
1650                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1651                                         (j == TX)  ? "in" : "out");
1652
1653                         hwep->ci          = ci;
1654                         hwep->lock         = &ci->lock;
1655                         hwep->td_pool      = ci->td_pool;
1656
1657                         hwep->ep.name      = hwep->name;
1658                         hwep->ep.ops       = &usb_ep_ops;
1659
1660                         if (i == 0) {
1661                                 hwep->ep.caps.type_control = true;
1662                         } else {
1663                                 hwep->ep.caps.type_iso = true;
1664                                 hwep->ep.caps.type_bulk = true;
1665                                 hwep->ep.caps.type_int = true;
1666                         }
1667
1668                         if (j == TX)
1669                                 hwep->ep.caps.dir_in = true;
1670                         else
1671                                 hwep->ep.caps.dir_out = true;
1672
1673                         /*
1674                          * for ep0: maxP defined in desc, for other
1675                          * eps, maxP is set by epautoconfig() called
1676                          * by gadget layer
1677                          */
1678                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1679
1680                         INIT_LIST_HEAD(&hwep->qh.queue);
1681                         hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1682                                                        &hwep->qh.dma);
1683                         if (hwep->qh.ptr == NULL)
1684                                 retval = -ENOMEM;
1685
1686                         /*
1687                          * set up shorthands for ep0 out and in endpoints,
1688                          * don't add to gadget's ep_list
1689                          */
1690                         if (i == 0) {
1691                                 if (j == RX)
1692                                         ci->ep0out = hwep;
1693                                 else
1694                                         ci->ep0in = hwep;
1695
1696                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1697                                 continue;
1698                         }
1699
1700                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1701                 }
1702
1703         return retval;
1704 }
1705
1706 static void destroy_eps(struct ci_hdrc *ci)
1707 {
1708         int i;
1709
1710         for (i = 0; i < ci->hw_ep_max; i++) {
1711                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1712
1713                 if (hwep->pending_td)
1714                         free_pending_td(hwep);
1715                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1716         }
1717 }
1718
1719 /**
1720  * ci_udc_start: register a gadget driver
1721  * @gadget: our gadget
1722  * @driver: the driver being registered
1723  *
1724  * Interrupts are enabled here.
1725  */
1726 static int ci_udc_start(struct usb_gadget *gadget,
1727                          struct usb_gadget_driver *driver)
1728 {
1729         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1730         int retval = -ENOMEM;
1731
1732         if (driver->disconnect == NULL)
1733                 return -EINVAL;
1734
1735
1736         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1737         retval = usb_ep_enable(&ci->ep0out->ep);
1738         if (retval)
1739                 return retval;
1740
1741         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1742         retval = usb_ep_enable(&ci->ep0in->ep);
1743         if (retval)
1744                 return retval;
1745
1746         ci->driver = driver;
1747
1748         /* Start otg fsm for B-device */
1749         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1750                 ci_hdrc_otg_fsm_start(ci);
1751                 return retval;
1752         }
1753
1754         pm_runtime_get_sync(&ci->gadget.dev);
1755         if (ci->vbus_active) {
1756                 hw_device_reset(ci);
1757         } else {
1758                 usb_udc_vbus_handler(&ci->gadget, false);
1759                 pm_runtime_put_sync(&ci->gadget.dev);
1760                 return retval;
1761         }
1762
1763         retval = hw_device_state(ci, ci->ep0out->qh.dma);
1764         if (retval)
1765                 pm_runtime_put_sync(&ci->gadget.dev);
1766
1767         return retval;
1768 }
1769
1770 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1771 {
1772         if (!ci_otg_is_fsm_mode(ci))
1773                 return;
1774
1775         mutex_lock(&ci->fsm.lock);
1776         if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1777                 ci->fsm.a_bidl_adis_tmout = 1;
1778                 ci_hdrc_otg_fsm_start(ci);
1779         } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1780                 ci->fsm.protocol = PROTO_UNDEF;
1781                 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1782         }
1783         mutex_unlock(&ci->fsm.lock);
1784 }
1785
1786 /**
1787  * ci_udc_stop: unregister a gadget driver
1788  */
1789 static int ci_udc_stop(struct usb_gadget *gadget)
1790 {
1791         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1792         unsigned long flags;
1793
1794         spin_lock_irqsave(&ci->lock, flags);
1795
1796         if (ci->vbus_active) {
1797                 hw_device_state(ci, 0);
1798                 spin_unlock_irqrestore(&ci->lock, flags);
1799                 if (ci->platdata->notify_event)
1800                         ci->platdata->notify_event(ci,
1801                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1802                 _gadget_stop_activity(&ci->gadget);
1803                 spin_lock_irqsave(&ci->lock, flags);
1804                 pm_runtime_put(&ci->gadget.dev);
1805         }
1806
1807         ci->driver = NULL;
1808         spin_unlock_irqrestore(&ci->lock, flags);
1809
1810         ci_udc_stop_for_otg_fsm(ci);
1811         return 0;
1812 }
1813
1814 /******************************************************************************
1815  * BUS block
1816  *****************************************************************************/
1817 /**
1818  * udc_irq: ci interrupt handler
1819  *
1820  * This function returns IRQ_HANDLED if the IRQ has been handled
1821  * It locks access to registers
1822  */
1823 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1824 {
1825         irqreturn_t retval;
1826         u32 intr;
1827
1828         if (ci == NULL)
1829                 return IRQ_HANDLED;
1830
1831         spin_lock(&ci->lock);
1832
1833         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1834                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1835                                 USBMODE_CM_DC) {
1836                         spin_unlock(&ci->lock);
1837                         return IRQ_NONE;
1838                 }
1839         }
1840         intr = hw_test_and_clear_intr_active(ci);
1841
1842         if (intr) {
1843                 /* order defines priority - do NOT change it */
1844                 if (USBi_URI & intr)
1845                         isr_reset_handler(ci);
1846
1847                 if (USBi_PCI & intr) {
1848                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
1849                                 USB_SPEED_HIGH : USB_SPEED_FULL;
1850                         if (ci->suspended) {
1851                                 if (ci->driver->resume) {
1852                                         spin_unlock(&ci->lock);
1853                                         ci->driver->resume(&ci->gadget);
1854                                         spin_lock(&ci->lock);
1855                                 }
1856                                 ci->suspended = 0;
1857                                 usb_gadget_set_state(&ci->gadget,
1858                                                 ci->resume_state);
1859                         }
1860                 }
1861
1862                 if (USBi_UI  & intr)
1863                         isr_tr_complete_handler(ci);
1864
1865                 if ((USBi_SLI & intr) && !(ci->suspended)) {
1866                         ci->suspended = 1;
1867                         ci->resume_state = ci->gadget.state;
1868                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1869                             ci->driver->suspend) {
1870                                 spin_unlock(&ci->lock);
1871                                 ci->driver->suspend(&ci->gadget);
1872                                 spin_lock(&ci->lock);
1873                         }
1874                         usb_gadget_set_state(&ci->gadget,
1875                                         USB_STATE_SUSPENDED);
1876                 }
1877                 retval = IRQ_HANDLED;
1878         } else {
1879                 retval = IRQ_NONE;
1880         }
1881         spin_unlock(&ci->lock);
1882
1883         return retval;
1884 }
1885
1886 /**
1887  * udc_start: initialize gadget role
1888  * @ci: chipidea controller
1889  */
1890 static int udc_start(struct ci_hdrc *ci)
1891 {
1892         struct device *dev = ci->dev;
1893         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1894         int retval = 0;
1895
1896         ci->gadget.ops          = &usb_gadget_ops;
1897         ci->gadget.speed        = USB_SPEED_UNKNOWN;
1898         ci->gadget.max_speed    = USB_SPEED_HIGH;
1899         ci->gadget.name         = ci->platdata->name;
1900         ci->gadget.otg_caps     = otg_caps;
1901
1902         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1903                                                 otg_caps->adp_support))
1904                 ci->gadget.is_otg = 1;
1905
1906         INIT_LIST_HEAD(&ci->gadget.ep_list);
1907
1908         /* alloc resources */
1909         ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
1910                                        sizeof(struct ci_hw_qh),
1911                                        64, CI_HDRC_PAGE_SIZE);
1912         if (ci->qh_pool == NULL)
1913                 return -ENOMEM;
1914
1915         ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
1916                                        sizeof(struct ci_hw_td),
1917                                        64, CI_HDRC_PAGE_SIZE);
1918         if (ci->td_pool == NULL) {
1919                 retval = -ENOMEM;
1920                 goto free_qh_pool;
1921         }
1922
1923         retval = init_eps(ci);
1924         if (retval)
1925                 goto free_pools;
1926
1927         ci->gadget.ep0 = &ci->ep0in->ep;
1928
1929         retval = usb_add_gadget_udc(dev, &ci->gadget);
1930         if (retval)
1931                 goto destroy_eps;
1932
1933         pm_runtime_no_callbacks(&ci->gadget.dev);
1934         pm_runtime_enable(&ci->gadget.dev);
1935
1936         return retval;
1937
1938 destroy_eps:
1939         destroy_eps(ci);
1940 free_pools:
1941         dma_pool_destroy(ci->td_pool);
1942 free_qh_pool:
1943         dma_pool_destroy(ci->qh_pool);
1944         return retval;
1945 }
1946
1947 /**
1948  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1949  *
1950  * No interrupts active, the IRQ has been released
1951  */
1952 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1953 {
1954         if (!ci->roles[CI_ROLE_GADGET])
1955                 return;
1956
1957         usb_del_gadget_udc(&ci->gadget);
1958
1959         destroy_eps(ci);
1960
1961         dma_pool_destroy(ci->td_pool);
1962         dma_pool_destroy(ci->qh_pool);
1963 }
1964
1965 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1966 {
1967         if (ci->is_otg)
1968                 /* Clear and enable BSV irq */
1969                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1970                                         OTGSC_BSVIS | OTGSC_BSVIE);
1971
1972         return 0;
1973 }
1974
1975 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1976 {
1977         /*
1978          * host doesn't care B_SESSION_VALID event
1979          * so clear and disbale BSV irq
1980          */
1981         if (ci->is_otg)
1982                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1983
1984         ci->vbus_active = 0;
1985 }
1986
1987 /**
1988  * ci_hdrc_gadget_init - initialize device related bits
1989  * ci: the controller
1990  *
1991  * This function initializes the gadget, if the device is "device capable".
1992  */
1993 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1994 {
1995         struct ci_role_driver *rdrv;
1996         int ret;
1997
1998         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1999                 return -ENXIO;
2000
2001         rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2002         if (!rdrv)
2003                 return -ENOMEM;
2004
2005         rdrv->start     = udc_id_switch_for_device;
2006         rdrv->stop      = udc_id_switch_for_host;
2007         rdrv->irq       = udc_irq;
2008         rdrv->name      = "gadget";
2009
2010         ret = udc_start(ci);
2011         if (!ret)
2012                 ci->roles[CI_ROLE_GADGET] = rdrv;
2013
2014         return ret;
2015 }