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 |= 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         ret = hw_ep_prime(ci, hwep->num, hwep->dir,
 511                            hwep->type == USB_ENDPOINT_XFER_CONTROL);
 512 done:
 513         return ret;
 514 }
 515
 516 /*
 517  * free_pending_td: remove a pending request for the endpoint
 518  * @hwep: endpoint
 519  */
 520 static void free_pending_td(struct ci_hw_ep *hwep)
 521 {
 522         struct td_node *pending = hwep->pending_td;
 523
 524         dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
 525         hwep->pending_td = NULL;
 526         kfree(pending);
 527 }
 528
 529 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
 530                                            struct td_node *node)
 531 {
 532         hwep->qh.ptr->td.next = node->dma;
 533         hwep->qh.ptr->td.token &=
 534                 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
 535
 536         return hw_ep_prime(ci, hwep->num, hwep->dir,
 537                                 hwep->type == USB_ENDPOINT_XFER_CONTROL);
 538 }
 539
 540 /**
 541  * _hardware_dequeue: handles a request at hardware level
 542  * @gadget: gadget
 543  * @hwep:   endpoint
 544  *
 545  * This function returns an error code
 546  */
 547 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 548 {
 549         u32 tmptoken;
 550         struct td_node *node, *tmpnode;
 551         unsigned remaining_length;
 552         unsigned actual = hwreq->req.length;
 553         struct ci_hdrc *ci = hwep->ci;
 554
 555         if (hwreq->req.status != -EALREADY)
 556                 return -EINVAL;
 557
 558         hwreq->req.status = 0;
 559
 560         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 561                 tmptoken = le32_to_cpu(node->ptr->token);
 562                 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
 563                         int n = hw_ep_bit(hwep->num, hwep->dir);
 564
 565                         if (ci->rev == CI_REVISION_24)
 566                                 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 567                                         reprime_dtd(ci, hwep, node);
 568                         hwreq->req.status = -EALREADY;
 569                         return -EBUSY;
 570                 }
 571
 572                 remaining_length = (tmptoken & TD_TOTAL_BYTES);
 573                 remaining_length >>= __ffs(TD_TOTAL_BYTES);
 574                 actual -= remaining_length;
 575
 576                 hwreq->req.status = tmptoken & TD_STATUS;
 577                 if ((TD_STATUS_HALTED & hwreq->req.status)) {
 578                         hwreq->req.status = -EPIPE;
 579                         break;
 580                 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
 581                         hwreq->req.status = -EPROTO;
 582                         break;
 583                 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
 584                         hwreq->req.status = -EILSEQ;
 585                         break;
 586                 }
 587
 588                 if (remaining_length) {
 589                         if (hwep->dir == TX) {
 590                                 hwreq->req.status = -EPROTO;
 591                                 break;
 592                         }
 593                 }
 594                 /*
 595                  * As the hardware could still address the freed td
 596                  * which will run the udc unusable, the cleanup of the
 597                  * td has to be delayed by one.
 598                  */
 599                 if (hwep->pending_td)
 600                         free_pending_td(hwep);
 601
 602                 hwep->pending_td = node;
 603                 list_del_init(&node->td);
 604         }
 605
 606         usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
 607
 608         hwreq->req.actual += actual;
 609
 610         if (hwreq->req.status)
 611                 return hwreq->req.status;
 612
 613         return hwreq->req.actual;
 614 }
 615
 616 /**
 617  * _ep_nuke: dequeues all endpoint requests
 618  * @hwep: endpoint
 619  *
 620  * This function returns an error code
 621  * Caller must hold lock
 622  */
 623 static int _ep_nuke(struct ci_hw_ep *hwep)
 624 __releases(hwep->lock)
 625 __acquires(hwep->lock)
 626 {
 627         struct td_node *node, *tmpnode;
 628         if (hwep == NULL)
 629                 return -EINVAL;
 630
 631         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
 632
 633         while (!list_empty(&hwep->qh.queue)) {
 634
 635                 /* pop oldest request */
 636                 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
 637                                                      struct ci_hw_req, queue);
 638
 639                 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 640                         dma_pool_free(hwep->td_pool, node->ptr, node->dma);
 641                         list_del_init(&node->td);
 642                         node->ptr = NULL;
 643                         kfree(node);
 644                 }
 645
 646                 list_del_init(&hwreq->queue);
 647                 hwreq->req.status = -ESHUTDOWN;
 648
 649                 if (hwreq->req.complete != NULL) {
 650                         spin_unlock(hwep->lock);
 651                         usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
 652                         spin_lock(hwep->lock);
 653                 }
 654         }
 655
 656         if (hwep->pending_td)
 657                 free_pending_td(hwep);
 658
 659         return 0;
 660 }
 661
 662 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
 663 {
 664         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
 665         int direction, retval = 0;
 666         unsigned long flags;
 667
 668         if (ep == NULL || hwep->ep.desc == NULL)
 669                 return -EINVAL;
 670
 671         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
 672                 return -EOPNOTSUPP;
 673
 674         spin_lock_irqsave(hwep->lock, flags);
 675
 676         if (value && hwep->dir == TX && check_transfer &&
 677                 !list_empty(&hwep->qh.queue) &&
 678                         !usb_endpoint_xfer_control(hwep->ep.desc)) {
 679                 spin_unlock_irqrestore(hwep->lock, flags);
 680                 return -EAGAIN;
 681         }
 682
 683         direction = hwep->dir;
 684         do {
 685                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
 686
 687                 if (!value)
 688                         hwep->wedge = 0;
 689
 690                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
 691                         hwep->dir = (hwep->dir == TX) ? RX : TX;
 692
 693         } while (hwep->dir != direction);
 694
 695         spin_unlock_irqrestore(hwep->lock, flags);
 696         return retval;
 697 }
 698
 699
 700 /**
 701  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 702  * @gadget: gadget
 703  *
 704  * This function returns an error code
 705  */
 706 static int _gadget_stop_activity(struct usb_gadget *gadget)
 707 {
 708         struct usb_ep *ep;
 709         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 710         unsigned long flags;
 711
 712         spin_lock_irqsave(&ci->lock, flags);
 713         ci->gadget.speed = USB_SPEED_UNKNOWN;
 714         ci->remote_wakeup = 0;
 715         ci->suspended = 0;
 716         spin_unlock_irqrestore(&ci->lock, flags);
 717
 718         /* flush all endpoints */
 719         gadget_for_each_ep(ep, gadget) {
 720                 usb_ep_fifo_flush(ep);
 721         }
 722         usb_ep_fifo_flush(&ci->ep0out->ep);
 723         usb_ep_fifo_flush(&ci->ep0in->ep);
 724
 725         /* make sure to disable all endpoints */
 726         gadget_for_each_ep(ep, gadget) {
 727                 usb_ep_disable(ep);
 728         }
 729
 730         if (ci->status != NULL) {
 731                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 732                 ci->status = NULL;
 733         }
 734
 735         return 0;
 736 }
 737
 738 /******************************************************************************
 739  * ISR block
 740  *****************************************************************************/
 741 /**
 742  * isr_reset_handler: USB reset interrupt handler
 743  * @ci: UDC device
 744  *
 745  * This function resets USB engine after a bus reset occurred
 746  */
 747 static void isr_reset_handler(struct ci_hdrc *ci)
 748 __releases(ci->lock)
 749 __acquires(ci->lock)
 750 {
 751         int retval;
 752
 753         spin_unlock(&ci->lock);
 754         if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 755                 usb_gadget_udc_reset(&ci->gadget, ci->driver);
 756
 757         retval = _gadget_stop_activity(&ci->gadget);
 758         if (retval)
 759                 goto done;
 760
 761         retval = hw_usb_reset(ci);
 762         if (retval)
 763                 goto done;
 764
 765         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 766         if (ci->status == NULL)
 767                 retval = -ENOMEM;
 768
 769 done:
 770         spin_lock(&ci->lock);
 771
 772         if (retval)
 773                 dev_err(ci->dev, "error: %i\n", retval);
 774 }
 775
 776 /**
 777  * isr_get_status_complete: get_status request complete function
 778  * @ep:  endpoint
 779  * @req: request handled
 780  *
 781  * Caller must release lock
 782  */
 783 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 784 {
 785         if (ep == NULL || req == NULL)
 786                 return;
 787
 788         kfree(req->buf);
 789         usb_ep_free_request(ep, req);
 790 }
 791
 792 /**
 793  * _ep_queue: queues (submits) an I/O request to an endpoint
 794  * @ep:        endpoint
 795  * @req:       request
 796  * @gfp_flags: GFP flags (not used)
 797  *
 798  * Caller must hold lock
 799  * This function returns an error code
 800  */
 801 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 802                     gfp_t __maybe_unused gfp_flags)
 803 {
 804         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 805         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 806         struct ci_hdrc *ci = hwep->ci;
 807         int retval = 0;
 808
 809         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 810                 return -EINVAL;
 811
 812         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 813                 if (req->length)
 814                         hwep = (ci->ep0_dir == RX) ?
 815                                ci->ep0out : ci->ep0in;
 816                 if (!list_empty(&hwep->qh.queue)) {
 817                         _ep_nuke(hwep);
 818                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 819                                  _usb_addr(hwep));
 820                 }
 821         }
 822
 823         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 824             hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
 825                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 826                 return -EMSGSIZE;
 827         }
 828
 829         /* first nuke then test link, e.g. previous status has not sent */
 830         if (!list_empty(&hwreq->queue)) {
 831                 dev_err(hwep->ci->dev, "request already in queue\n");
 832                 return -EBUSY;
 833         }
 834
 835         /* push request */
 836         hwreq->req.status = -EINPROGRESS;
 837         hwreq->req.actual = 0;
 838
 839         retval = _hardware_enqueue(hwep, hwreq);
 840
 841         if (retval == -EALREADY)
 842                 retval = 0;
 843         if (!retval)
 844                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
 845
 846         return retval;
 847 }
 848
 849 /**
 850  * isr_get_status_response: get_status request response
 851  * @ci: ci struct
 852  * @setup: setup request packet
 853  *
 854  * This function returns an error code
 855  */
 856 static int isr_get_status_response(struct ci_hdrc *ci,
 857                                    struct usb_ctrlrequest *setup)
 858 __releases(hwep->lock)
 859 __acquires(hwep->lock)
 860 {
 861         struct ci_hw_ep *hwep = ci->ep0in;
 862         struct usb_request *req = NULL;
 863         gfp_t gfp_flags = GFP_ATOMIC;
 864         int dir, num, retval;
 865
 866         if (hwep == NULL || setup == NULL)
 867                 return -EINVAL;
 868
 869         spin_unlock(hwep->lock);
 870         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 871         spin_lock(hwep->lock);
 872         if (req == NULL)
 873                 return -ENOMEM;
 874
 875         req->complete = isr_get_status_complete;
 876         req->length   = 2;
 877         req->buf      = kzalloc(req->length, gfp_flags);
 878         if (req->buf == NULL) {
 879                 retval = -ENOMEM;
 880                 goto err_free_req;
 881         }
 882
 883         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
 884                 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
 885                         ci->gadget.is_selfpowered;
 886         } else if ((setup->bRequestType & USB_RECIP_MASK) \
 887                    == USB_RECIP_ENDPOINT) {
 888                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
 889                         TX : RX;
 890                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 891                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
 892         }
 893         /* else do nothing; reserved for future use */
 894
 895         retval = _ep_queue(&hwep->ep, req, gfp_flags);
 896         if (retval)
 897                 goto err_free_buf;
 898
 899         return 0;
 900
 901  err_free_buf:
 902         kfree(req->buf);
 903  err_free_req:
 904         spin_unlock(hwep->lock);
 905         usb_ep_free_request(&hwep->ep, req);
 906         spin_lock(hwep->lock);
 907         return retval;
 908 }
 909
 910 /**
 911  * isr_setup_status_complete: setup_status request complete function
 912  * @ep:  endpoint
 913  * @req: request handled
 914  *
 915  * Caller must release lock. Put the port in test mode if test mode
 916  * feature is selected.
 917  */
 918 static void
 919 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
 920 {
 921         struct ci_hdrc *ci = req->context;
 922         unsigned long flags;
 923
 924         if (ci->setaddr) {
 925                 hw_usb_set_address(ci, ci->address);
 926                 ci->setaddr = false;
 927                 if (ci->address)
 928                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
 929         }
 930
 931         spin_lock_irqsave(&ci->lock, flags);
 932         if (ci->test_mode)
 933                 hw_port_test_set(ci, ci->test_mode);
 934         spin_unlock_irqrestore(&ci->lock, flags);
 935 }
 936
 937 /**
 938  * isr_setup_status_phase: queues the status phase of a setup transation
 939  * @ci: ci struct
 940  *
 941  * This function returns an error code
 942  */
 943 static int isr_setup_status_phase(struct ci_hdrc *ci)
 944 {
 945         int retval;
 946         struct ci_hw_ep *hwep;
 947
 948         /*
 949          * Unexpected USB controller behavior, caused by bad signal integrity
 950          * or ground reference problems, can lead to isr_setup_status_phase
 951          * being called with ci->status equal to NULL.
 952          * If this situation occurs, you should review your USB hardware design.
 953          */
 954         if (WARN_ON_ONCE(!ci->status))
 955                 return -EPIPE;
 956
 957         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
 958         ci->status->context = ci;
 959         ci->status->complete = isr_setup_status_complete;
 960
 961         retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
 962
 963         return retval;
 964 }
 965
 966 /**
 967  * isr_tr_complete_low: transaction complete low level handler
 968  * @hwep: endpoint
 969  *
 970  * This function returns an error code
 971  * Caller must hold lock
 972  */
 973 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
 974 __releases(hwep->lock)
 975 __acquires(hwep->lock)
 976 {
 977         struct ci_hw_req *hwreq, *hwreqtemp;
 978         struct ci_hw_ep *hweptemp = hwep;
 979         int retval = 0;
 980
 981         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
 982                         queue) {
 983                 retval = _hardware_dequeue(hwep, hwreq);
 984                 if (retval < 0)
 985                         break;
 986                 list_del_init(&hwreq->queue);
 987                 if (hwreq->req.complete != NULL) {
 988                         spin_unlock(hwep->lock);
 989                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
 990                                         hwreq->req.length)
 991                                 hweptemp = hwep->ci->ep0in;
 992                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
 993                         spin_lock(hwep->lock);
 994                 }
 995         }
 996
 997         if (retval == -EBUSY)
 998                 retval = 0;
 999
1000         return retval;
1001 }
1002
1003 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1004 {
1005         dev_warn(&ci->gadget.dev,
1006                 "connect the device to an alternate port if you want HNP\n");
1007         return isr_setup_status_phase(ci);
1008 }
1009
1010 /**
1011  * isr_setup_packet_handler: setup packet handler
1012  * @ci: UDC descriptor
1013  *
1014  * This function handles setup packet
1015  */
1016 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1017 __releases(ci->lock)
1018 __acquires(ci->lock)
1019 {
1020         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1021         struct usb_ctrlrequest req;
1022         int type, num, dir, err = -EINVAL;
1023         u8 tmode = 0;
1024
1025         /*
1026          * Flush data and handshake transactions of previous
1027          * setup packet.
1028          */
1029         _ep_nuke(ci->ep0out);
1030         _ep_nuke(ci->ep0in);
1031
1032         /* read_setup_packet */
1033         do {
1034                 hw_test_and_set_setup_guard(ci);
1035                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1036         } while (!hw_test_and_clear_setup_guard(ci));
1037
1038         type = req.bRequestType;
1039
1040         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1041
1042         switch (req.bRequest) {
1043         case USB_REQ_CLEAR_FEATURE:
1044                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1045                                 le16_to_cpu(req.wValue) ==
1046                                 USB_ENDPOINT_HALT) {
1047                         if (req.wLength != 0)
1048                                 break;
1049                         num  = le16_to_cpu(req.wIndex);
1050                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1051                         num &= USB_ENDPOINT_NUMBER_MASK;
1052                         if (dir == TX)
1053                                 num += ci->hw_ep_max / 2;
1054                         if (!ci->ci_hw_ep[num].wedge) {
1055                                 spin_unlock(&ci->lock);
1056                                 err = usb_ep_clear_halt(
1057                                         &ci->ci_hw_ep[num].ep);
1058                                 spin_lock(&ci->lock);
1059                                 if (err)
1060                                         break;
1061                         }
1062                         err = isr_setup_status_phase(ci);
1063                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1064                                 le16_to_cpu(req.wValue) ==
1065                                 USB_DEVICE_REMOTE_WAKEUP) {
1066                         if (req.wLength != 0)
1067                                 break;
1068                         ci->remote_wakeup = 0;
1069                         err = isr_setup_status_phase(ci);
1070                 } else {
1071                         goto delegate;
1072                 }
1073                 break;
1074         case USB_REQ_GET_STATUS:
1075                 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1076                         le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1077                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1078                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1079                         goto delegate;
1080                 if (le16_to_cpu(req.wLength) != 2 ||
1081                     le16_to_cpu(req.wValue)  != 0)
1082                         break;
1083                 err = isr_get_status_response(ci, &req);
1084                 break;
1085         case USB_REQ_SET_ADDRESS:
1086                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1087                         goto delegate;
1088                 if (le16_to_cpu(req.wLength) != 0 ||
1089                     le16_to_cpu(req.wIndex)  != 0)
1090                         break;
1091                 ci->address = (u8)le16_to_cpu(req.wValue);
1092                 ci->setaddr = true;
1093                 err = isr_setup_status_phase(ci);
1094                 break;
1095         case USB_REQ_SET_FEATURE:
1096                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1097                                 le16_to_cpu(req.wValue) ==
1098                                 USB_ENDPOINT_HALT) {
1099                         if (req.wLength != 0)
1100                                 break;
1101                         num  = le16_to_cpu(req.wIndex);
1102                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1103                         num &= USB_ENDPOINT_NUMBER_MASK;
1104                         if (dir == TX)
1105                                 num += ci->hw_ep_max / 2;
1106
1107                         spin_unlock(&ci->lock);
1108                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1109                         spin_lock(&ci->lock);
1110                         if (!err)
1111                                 isr_setup_status_phase(ci);
1112                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1113                         if (req.wLength != 0)
1114                                 break;
1115                         switch (le16_to_cpu(req.wValue)) {
1116                         case USB_DEVICE_REMOTE_WAKEUP:
1117                                 ci->remote_wakeup = 1;
1118                                 err = isr_setup_status_phase(ci);
1119                                 break;
1120                         case USB_DEVICE_TEST_MODE:
1121                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1122                                 switch (tmode) {
1123                                 case TEST_J:
1124                                 case TEST_K:
1125                                 case TEST_SE0_NAK:
1126                                 case TEST_PACKET:
1127                                 case TEST_FORCE_EN:
1128                                         ci->test_mode = tmode;
1129                                         err = isr_setup_status_phase(
1130                                                         ci);
1131                                         break;
1132                                 default:
1133                                         break;
1134                                 }
1135                                 break;
1136                         case USB_DEVICE_B_HNP_ENABLE:
1137                                 if (ci_otg_is_fsm_mode(ci)) {
1138                                         ci->gadget.b_hnp_enable = 1;
1139                                         err = isr_setup_status_phase(
1140                                                         ci);
1141                                 }
1142                                 break;
1143                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1144                                 if (ci_otg_is_fsm_mode(ci))
1145                                         err = otg_a_alt_hnp_support(ci);
1146                                 break;
1147                         case USB_DEVICE_A_HNP_SUPPORT:
1148                                 if (ci_otg_is_fsm_mode(ci)) {
1149                                         ci->gadget.a_hnp_support = 1;
1150                                         err = isr_setup_status_phase(
1151                                                         ci);
1152                                 }
1153                                 break;
1154                         default:
1155                                 goto delegate;
1156                         }
1157                 } else {
1158                         goto delegate;
1159                 }
1160                 break;
1161         default:
1162 delegate:
1163                 if (req.wLength == 0)   /* no data phase */
1164                         ci->ep0_dir = TX;
1165
1166                 spin_unlock(&ci->lock);
1167                 err = ci->driver->setup(&ci->gadget, &req);
1168                 spin_lock(&ci->lock);
1169                 break;
1170         }
1171
1172         if (err < 0) {
1173                 spin_unlock(&ci->lock);
1174                 if (_ep_set_halt(&hwep->ep, 1, false))
1175                         dev_err(ci->dev, "error: _ep_set_halt\n");
1176                 spin_lock(&ci->lock);
1177         }
1178 }
1179
1180 /**
1181  * isr_tr_complete_handler: transaction complete interrupt handler
1182  * @ci: UDC descriptor
1183  *
1184  * This function handles traffic events
1185  */
1186 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1187 __releases(ci->lock)
1188 __acquires(ci->lock)
1189 {
1190         unsigned i;
1191         int err;
1192
1193         for (i = 0; i < ci->hw_ep_max; i++) {
1194                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1195
1196                 if (hwep->ep.desc == NULL)
1197                         continue;   /* not configured */
1198
1199                 if (hw_test_and_clear_complete(ci, i)) {
1200                         err = isr_tr_complete_low(hwep);
1201                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1202                                 if (err > 0)   /* needs status phase */
1203                                         err = isr_setup_status_phase(ci);
1204                                 if (err < 0) {
1205                                         spin_unlock(&ci->lock);
1206                                         if (_ep_set_halt(&hwep->ep, 1, false))
1207                                                 dev_err(ci->dev,
1208                                                 "error: _ep_set_halt\n");
1209                                         spin_lock(&ci->lock);
1210                                 }
1211                         }
1212                 }
1213
1214                 /* Only handle setup packet below */
1215                 if (i == 0 &&
1216                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1217                         isr_setup_packet_handler(ci);
1218         }
1219 }
1220
1221 /******************************************************************************
1222  * ENDPT block
1223  *****************************************************************************/
1224 /**
1225  * ep_enable: configure endpoint, making it usable
1226  *
1227  * Check usb_ep_enable() at "usb_gadget.h" for details
1228  */
1229 static int ep_enable(struct usb_ep *ep,
1230                      const struct usb_endpoint_descriptor *desc)
1231 {
1232         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1233         int retval = 0;
1234         unsigned long flags;
1235         u32 cap = 0;
1236
1237         if (ep == NULL || desc == NULL)
1238                 return -EINVAL;
1239
1240         spin_lock_irqsave(hwep->lock, flags);
1241
1242         /* only internal SW should enable ctrl endpts */
1243
1244         if (!list_empty(&hwep->qh.queue)) {
1245                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1246                 spin_unlock_irqrestore(hwep->lock, flags);
1247                 return -EBUSY;
1248         }
1249
1250         hwep->ep.desc = desc;
1251
1252         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1253         hwep->num  = usb_endpoint_num(desc);
1254         hwep->type = usb_endpoint_type(desc);
1255
1256         hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1257         hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1258
1259         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1260                 cap |= QH_IOS;
1261
1262         cap |= QH_ZLT;
1263         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1264         /*
1265          * For ISO-TX, we set mult at QH as the largest value, and use
1266          * MultO at TD as real mult value.
1267          */
1268         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1269                 cap |= 3 << __ffs(QH_MULT);
1270
1271         hwep->qh.ptr->cap = cpu_to_le32(cap);
1272
1273         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1274
1275         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1276                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1277                 retval = -EINVAL;
1278         }
1279
1280         /*
1281          * Enable endpoints in the HW other than ep0 as ep0
1282          * is always enabled
1283          */
1284         if (hwep->num)
1285                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1286                                        hwep->type);
1287
1288         spin_unlock_irqrestore(hwep->lock, flags);
1289         return retval;
1290 }
1291
1292 /**
1293  * ep_disable: endpoint is no longer usable
1294  *
1295  * Check usb_ep_disable() at "usb_gadget.h" for details
1296  */
1297 static int ep_disable(struct usb_ep *ep)
1298 {
1299         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1300         int direction, retval = 0;
1301         unsigned long flags;
1302
1303         if (ep == NULL)
1304                 return -EINVAL;
1305         else if (hwep->ep.desc == NULL)
1306                 return -EBUSY;
1307
1308         spin_lock_irqsave(hwep->lock, flags);
1309
1310         /* only internal SW should disable ctrl endpts */
1311
1312         direction = hwep->dir;
1313         do {
1314                 retval |= _ep_nuke(hwep);
1315                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1316
1317                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1318                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1319
1320         } while (hwep->dir != direction);
1321
1322         hwep->ep.desc = NULL;
1323
1324         spin_unlock_irqrestore(hwep->lock, flags);
1325         return retval;
1326 }
1327
1328 /**
1329  * ep_alloc_request: allocate a request object to use with this endpoint
1330  *
1331  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1332  */
1333 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1334 {
1335         struct ci_hw_req *hwreq = NULL;
1336
1337         if (ep == NULL)
1338                 return NULL;
1339
1340         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1341         if (hwreq != NULL) {
1342                 INIT_LIST_HEAD(&hwreq->queue);
1343                 INIT_LIST_HEAD(&hwreq->tds);
1344         }
1345
1346         return (hwreq == NULL) ? NULL : &hwreq->req;
1347 }
1348
1349 /**
1350  * ep_free_request: frees a request object
1351  *
1352  * Check usb_ep_free_request() at "usb_gadget.h" for details
1353  */
1354 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1355 {
1356         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1357         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1358         struct td_node *node, *tmpnode;
1359         unsigned long flags;
1360
1361         if (ep == NULL || req == NULL) {
1362                 return;
1363         } else if (!list_empty(&hwreq->queue)) {
1364                 dev_err(hwep->ci->dev, "freeing queued request\n");
1365                 return;
1366         }
1367
1368         spin_lock_irqsave(hwep->lock, flags);
1369
1370         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1371                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1372                 list_del_init(&node->td);
1373                 node->ptr = NULL;
1374                 kfree(node);
1375         }
1376
1377         kfree(hwreq);
1378
1379         spin_unlock_irqrestore(hwep->lock, flags);
1380 }
1381
1382 /**
1383  * ep_queue: queues (submits) an I/O request to an endpoint
1384  *
1385  * Check usb_ep_queue()* at usb_gadget.h" for details
1386  */
1387 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1388                     gfp_t __maybe_unused gfp_flags)
1389 {
1390         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1391         int retval = 0;
1392         unsigned long flags;
1393
1394         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1395                 return -EINVAL;
1396
1397         spin_lock_irqsave(hwep->lock, flags);
1398         retval = _ep_queue(ep, req, gfp_flags);
1399         spin_unlock_irqrestore(hwep->lock, flags);
1400         return retval;
1401 }
1402
1403 /**
1404  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1405  *
1406  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1407  */
1408 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1409 {
1410         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1411         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1412         unsigned long flags;
1413         struct td_node *node, *tmpnode;
1414
1415         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1416                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1417                 list_empty(&hwep->qh.queue))
1418                 return -EINVAL;
1419
1420         spin_lock_irqsave(hwep->lock, flags);
1421
1422         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1423
1424         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1425                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1426                 list_del(&node->td);
1427                 kfree(node);
1428         }
1429
1430         /* pop request */
1431         list_del_init(&hwreq->queue);
1432
1433         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1434
1435         req->status = -ECONNRESET;
1436
1437         if (hwreq->req.complete != NULL) {
1438                 spin_unlock(hwep->lock);
1439                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1440                 spin_lock(hwep->lock);
1441         }
1442
1443         spin_unlock_irqrestore(hwep->lock, flags);
1444         return 0;
1445 }
1446
1447 /**
1448  * ep_set_halt: sets the endpoint halt feature
1449  *
1450  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1451  */
1452 static int ep_set_halt(struct usb_ep *ep, int value)
1453 {
1454         return _ep_set_halt(ep, value, true);
1455 }
1456
1457 /**
1458  * ep_set_wedge: sets the halt feature and ignores clear requests
1459  *
1460  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1461  */
1462 static int ep_set_wedge(struct usb_ep *ep)
1463 {
1464         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1465         unsigned long flags;
1466
1467         if (ep == NULL || hwep->ep.desc == NULL)
1468                 return -EINVAL;
1469
1470         spin_lock_irqsave(hwep->lock, flags);
1471         hwep->wedge = 1;
1472         spin_unlock_irqrestore(hwep->lock, flags);
1473
1474         return usb_ep_set_halt(ep);
1475 }
1476
1477 /**
1478  * ep_fifo_flush: flushes contents of a fifo
1479  *
1480  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1481  */
1482 static void ep_fifo_flush(struct usb_ep *ep)
1483 {
1484         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1485         unsigned long flags;
1486
1487         if (ep == NULL) {
1488                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1489                 return;
1490         }
1491
1492         spin_lock_irqsave(hwep->lock, flags);
1493
1494         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1495
1496         spin_unlock_irqrestore(hwep->lock, flags);
1497 }
1498
1499 /**
1500  * Endpoint-specific part of the API to the USB controller hardware
1501  * Check "usb_gadget.h" for details
1502  */
1503 static const struct usb_ep_ops usb_ep_ops = {
1504         .enable        = ep_enable,
1505         .disable       = ep_disable,
1506         .alloc_request = ep_alloc_request,
1507         .free_request  = ep_free_request,
1508         .queue         = ep_queue,
1509         .dequeue       = ep_dequeue,
1510         .set_halt      = ep_set_halt,
1511         .set_wedge     = ep_set_wedge,
1512         .fifo_flush    = ep_fifo_flush,
1513 };
1514
1515 /******************************************************************************
1516  * GADGET block
1517  *****************************************************************************/
1518 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1519 {
1520         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1521         unsigned long flags;
1522         int gadget_ready = 0;
1523
1524         spin_lock_irqsave(&ci->lock, flags);
1525         ci->vbus_active = is_active;
1526         if (ci->driver)
1527                 gadget_ready = 1;
1528         spin_unlock_irqrestore(&ci->lock, flags);
1529
1530         if (gadget_ready) {
1531                 if (is_active) {
1532                         pm_runtime_get_sync(&_gadget->dev);
1533                         hw_device_reset(ci);
1534                         hw_device_state(ci, ci->ep0out->qh.dma);
1535                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1536                         usb_udc_vbus_handler(_gadget, true);
1537                 } else {
1538                         usb_udc_vbus_handler(_gadget, false);
1539                         if (ci->driver)
1540                                 ci->driver->disconnect(&ci->gadget);
1541                         hw_device_state(ci, 0);
1542                         if (ci->platdata->notify_event)
1543                                 ci->platdata->notify_event(ci,
1544                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1545                         _gadget_stop_activity(&ci->gadget);
1546                         pm_runtime_put_sync(&_gadget->dev);
1547                         usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1548                 }
1549         }
1550
1551         return 0;
1552 }
1553
1554 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1555 {
1556         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1557         unsigned long flags;
1558         int ret = 0;
1559
1560         spin_lock_irqsave(&ci->lock, flags);
1561         if (!ci->remote_wakeup) {
1562                 ret = -EOPNOTSUPP;
1563                 goto out;
1564         }
1565         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1566                 ret = -EINVAL;
1567                 goto out;
1568         }
1569         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1570 out:
1571         spin_unlock_irqrestore(&ci->lock, flags);
1572         return ret;
1573 }
1574
1575 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1576 {
1577         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1578
1579         if (ci->usb_phy)
1580                 return usb_phy_set_power(ci->usb_phy, ma);
1581         return -ENOTSUPP;
1582 }
1583
1584 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1585 {
1586         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1587         struct ci_hw_ep *hwep = ci->ep0in;
1588         unsigned long flags;
1589
1590         spin_lock_irqsave(hwep->lock, flags);
1591         _gadget->is_selfpowered = (is_on != 0);
1592         spin_unlock_irqrestore(hwep->lock, flags);
1593
1594         return 0;
1595 }
1596
1597 /* Change Data+ pullup status
1598  * this func is used by usb_gadget_connect/disconnet
1599  */
1600 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1601 {
1602         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1603
1604         /*
1605          * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1606          * and don't touch Data+ in host mode for dual role config.
1607          */
1608         if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1609                 return 0;
1610
1611         pm_runtime_get_sync(&ci->gadget.dev);
1612         if (is_on)
1613                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1614         else
1615                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1616         pm_runtime_put_sync(&ci->gadget.dev);
1617
1618         return 0;
1619 }
1620
1621 static int ci_udc_start(struct usb_gadget *gadget,
1622                          struct usb_gadget_driver *driver);
1623 static int ci_udc_stop(struct usb_gadget *gadget);
1624 /**
1625  * Device operations part of the API to the USB controller hardware,
1626  * which don't involve endpoints (or i/o)
1627  * Check  "usb_gadget.h" for details
1628  */
1629 static const struct usb_gadget_ops usb_gadget_ops = {
1630         .vbus_session   = ci_udc_vbus_session,
1631         .wakeup         = ci_udc_wakeup,
1632         .set_selfpowered        = ci_udc_selfpowered,
1633         .pullup         = ci_udc_pullup,
1634         .vbus_draw      = ci_udc_vbus_draw,
1635         .udc_start      = ci_udc_start,
1636         .udc_stop       = ci_udc_stop,
1637 };
1638
1639 static int init_eps(struct ci_hdrc *ci)
1640 {
1641         int retval = 0, i, j;
1642
1643         for (i = 0; i < ci->hw_ep_max/2; i++)
1644                 for (j = RX; j <= TX; j++) {
1645                         int k = i + j * ci->hw_ep_max/2;
1646                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1647
1648                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1649                                         (j == TX)  ? "in" : "out");
1650
1651                         hwep->ci          = ci;
1652                         hwep->lock         = &ci->lock;
1653                         hwep->td_pool      = ci->td_pool;
1654
1655                         hwep->ep.name      = hwep->name;
1656                         hwep->ep.ops       = &usb_ep_ops;
1657
1658                         if (i == 0) {
1659                                 hwep->ep.caps.type_control = true;
1660                         } else {
1661                                 hwep->ep.caps.type_iso = true;
1662                                 hwep->ep.caps.type_bulk = true;
1663                                 hwep->ep.caps.type_int = true;
1664                         }
1665
1666                         if (j == TX)
1667                                 hwep->ep.caps.dir_in = true;
1668                         else
1669                                 hwep->ep.caps.dir_out = true;
1670
1671                         /*
1672                          * for ep0: maxP defined in desc, for other
1673                          * eps, maxP is set by epautoconfig() called
1674                          * by gadget layer
1675                          */
1676                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1677
1678                         INIT_LIST_HEAD(&hwep->qh.queue);
1679                         hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1680                                                        &hwep->qh.dma);
1681                         if (hwep->qh.ptr == NULL)
1682                                 retval = -ENOMEM;
1683
1684                         /*
1685                          * set up shorthands for ep0 out and in endpoints,
1686                          * don't add to gadget's ep_list
1687                          */
1688                         if (i == 0) {
1689                                 if (j == RX)
1690                                         ci->ep0out = hwep;
1691                                 else
1692                                         ci->ep0in = hwep;
1693
1694                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1695                                 continue;
1696                         }
1697
1698                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1699                 }
1700
1701         return retval;
1702 }
1703
1704 static void destroy_eps(struct ci_hdrc *ci)
1705 {
1706         int i;
1707
1708         for (i = 0; i < ci->hw_ep_max; i++) {
1709                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1710
1711                 if (hwep->pending_td)
1712                         free_pending_td(hwep);
1713                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1714         }
1715 }
1716
1717 /**
1718  * ci_udc_start: register a gadget driver
1719  * @gadget: our gadget
1720  * @driver: the driver being registered
1721  *
1722  * Interrupts are enabled here.
1723  */
1724 static int ci_udc_start(struct usb_gadget *gadget,
1725                          struct usb_gadget_driver *driver)
1726 {
1727         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1728         unsigned long flags;
1729         int retval = -ENOMEM;
1730
1731         if (driver->disconnect == NULL)
1732                 return -EINVAL;
1733
1734
1735         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1736         retval = usb_ep_enable(&ci->ep0out->ep);
1737         if (retval)
1738                 return retval;
1739
1740         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1741         retval = usb_ep_enable(&ci->ep0in->ep);
1742         if (retval)
1743                 return retval;
1744
1745         ci->driver = driver;
1746
1747         /* Start otg fsm for B-device */
1748         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1749                 ci_hdrc_otg_fsm_start(ci);
1750                 return retval;
1751         }
1752
1753         pm_runtime_get_sync(&ci->gadget.dev);
1754         if (ci->vbus_active) {
1755                 spin_lock_irqsave(&ci->lock, flags);
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         spin_unlock_irqrestore(&ci->lock, flags);
1765         if (retval)
1766                 pm_runtime_put_sync(&ci->gadget.dev);
1767
1768         return retval;
1769 }
1770
1771 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1772 {
1773         if (!ci_otg_is_fsm_mode(ci))
1774                 return;
1775
1776         mutex_lock(&ci->fsm.lock);
1777         if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1778                 ci->fsm.a_bidl_adis_tmout = 1;
1779                 ci_hdrc_otg_fsm_start(ci);
1780         } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1781                 ci->fsm.protocol = PROTO_UNDEF;
1782                 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1783         }
1784         mutex_unlock(&ci->fsm.lock);
1785 }
1786
1787 /**
1788  * ci_udc_stop: unregister a gadget driver
1789  */
1790 static int ci_udc_stop(struct usb_gadget *gadget)
1791 {
1792         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1793         unsigned long flags;
1794
1795         spin_lock_irqsave(&ci->lock, flags);
1796
1797         if (ci->vbus_active) {
1798                 hw_device_state(ci, 0);
1799                 if (ci->platdata->notify_event)
1800                         ci->platdata->notify_event(ci,
1801                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1802                 spin_unlock_irqrestore(&ci->lock, flags);
1803                 _gadget_stop_activity(&ci->gadget);
1804                 spin_lock_irqsave(&ci->lock, flags);
1805                 pm_runtime_put(&ci->gadget.dev);
1806         }
1807
1808         ci->driver = NULL;
1809         spin_unlock_irqrestore(&ci->lock, flags);
1810
1811         ci_udc_stop_for_otg_fsm(ci);
1812         return 0;
1813 }
1814
1815 /******************************************************************************
1816  * BUS block
1817  *****************************************************************************/
1818 /**
1819  * udc_irq: ci interrupt handler
1820  *
1821  * This function returns IRQ_HANDLED if the IRQ has been handled
1822  * It locks access to registers
1823  */
1824 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1825 {
1826         irqreturn_t retval;
1827         u32 intr;
1828
1829         if (ci == NULL)
1830                 return IRQ_HANDLED;
1831
1832         spin_lock(&ci->lock);
1833
1834         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1835                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1836                                 USBMODE_CM_DC) {
1837                         spin_unlock(&ci->lock);
1838                         return IRQ_NONE;
1839                 }
1840         }
1841         intr = hw_test_and_clear_intr_active(ci);
1842
1843         if (intr) {
1844                 /* order defines priority - do NOT change it */
1845                 if (USBi_URI & intr)
1846                         isr_reset_handler(ci);
1847
1848                 if (USBi_PCI & intr) {
1849                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
1850                                 USB_SPEED_HIGH : USB_SPEED_FULL;
1851                         if (ci->suspended && ci->driver->resume) {
1852                                 spin_unlock(&ci->lock);
1853                                 ci->driver->resume(&ci->gadget);
1854                                 spin_lock(&ci->lock);
1855                                 ci->suspended = 0;
1856                         }
1857                 }
1858
1859                 if (USBi_UI  & intr)
1860                         isr_tr_complete_handler(ci);
1861
1862                 if (USBi_SLI & intr) {
1863                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1864                             ci->driver->suspend) {
1865                                 ci->suspended = 1;
1866                                 spin_unlock(&ci->lock);
1867                                 ci->driver->suspend(&ci->gadget);
1868                                 usb_gadget_set_state(&ci->gadget,
1869                                                 USB_STATE_SUSPENDED);
1870                                 spin_lock(&ci->lock);
1871                         }
1872                 }
1873                 retval = IRQ_HANDLED;
1874         } else {
1875                 retval = IRQ_NONE;
1876         }
1877         spin_unlock(&ci->lock);
1878
1879         return retval;
1880 }
1881
1882 /**
1883  * udc_start: initialize gadget role
1884  * @ci: chipidea controller
1885  */
1886 static int udc_start(struct ci_hdrc *ci)
1887 {
1888         struct device *dev = ci->dev;
1889         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1890         int retval = 0;
1891
1892         spin_lock_init(&ci->lock);
1893
1894         ci->gadget.ops          = &usb_gadget_ops;
1895         ci->gadget.speed        = USB_SPEED_UNKNOWN;
1896         ci->gadget.max_speed    = USB_SPEED_HIGH;
1897         ci->gadget.name         = ci->platdata->name;
1898         ci->gadget.otg_caps     = otg_caps;
1899
1900         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1901                                                 otg_caps->adp_support))
1902                 ci->gadget.is_otg = 1;
1903
1904         INIT_LIST_HEAD(&ci->gadget.ep_list);
1905
1906         /* alloc resources */
1907         ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1908                                        sizeof(struct ci_hw_qh),
1909                                        64, CI_HDRC_PAGE_SIZE);
1910         if (ci->qh_pool == NULL)
1911                 return -ENOMEM;
1912
1913         ci->td_pool = dma_pool_create("ci_hw_td", dev,
1914                                        sizeof(struct ci_hw_td),
1915                                        64, CI_HDRC_PAGE_SIZE);
1916         if (ci->td_pool == NULL) {
1917                 retval = -ENOMEM;
1918                 goto free_qh_pool;
1919         }
1920
1921         retval = init_eps(ci);
1922         if (retval)
1923                 goto free_pools;
1924
1925         ci->gadget.ep0 = &ci->ep0in->ep;
1926
1927         retval = usb_add_gadget_udc(dev, &ci->gadget);
1928         if (retval)
1929                 goto destroy_eps;
1930
1931         pm_runtime_no_callbacks(&ci->gadget.dev);
1932         pm_runtime_enable(&ci->gadget.dev);
1933
1934         return retval;
1935
1936 destroy_eps:
1937         destroy_eps(ci);
1938 free_pools:
1939         dma_pool_destroy(ci->td_pool);
1940 free_qh_pool:
1941         dma_pool_destroy(ci->qh_pool);
1942         return retval;
1943 }
1944
1945 /**
1946  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1947  *
1948  * No interrupts active, the IRQ has been released
1949  */
1950 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1951 {
1952         if (!ci->roles[CI_ROLE_GADGET])
1953                 return;
1954
1955         usb_del_gadget_udc(&ci->gadget);
1956
1957         destroy_eps(ci);
1958
1959         dma_pool_destroy(ci->td_pool);
1960         dma_pool_destroy(ci->qh_pool);
1961 }
1962
1963 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1964 {
1965         if (ci->is_otg)
1966                 /* Clear and enable BSV irq */
1967                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1968                                         OTGSC_BSVIS | OTGSC_BSVIE);
1969
1970         return 0;
1971 }
1972
1973 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1974 {
1975         /*
1976          * host doesn't care B_SESSION_VALID event
1977          * so clear and disbale BSV irq
1978          */
1979         if (ci->is_otg)
1980                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1981 }
1982
1983 /**
1984  * ci_hdrc_gadget_init - initialize device related bits
1985  * ci: the controller
1986  *
1987  * This function initializes the gadget, if the device is "device capable".
1988  */
1989 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1990 {
1991         struct ci_role_driver *rdrv;
1992
1993         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1994                 return -ENXIO;
1995
1996         rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
1997         if (!rdrv)
1998                 return -ENOMEM;
1999
2000         rdrv->start     = udc_id_switch_for_device;
2001         rdrv->stop      = udc_id_switch_for_host;
2002         rdrv->irq       = udc_irq;
2003         rdrv->name      = "gadget";
2004         ci->roles[CI_ROLE_GADGET] = rdrv;
2005
2006         return udc_start(ci);
2007 }