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 "debug.h"
  30 #include "otg.h"
  31 #include "otg_fsm.h"
  32
  33 /* control endpoint description */
  34 static const struct usb_endpoint_descriptor
  35 ctrl_endpt_out_desc = {
  36         .bLength         = USB_DT_ENDPOINT_SIZE,
  37         .bDescriptorType = USB_DT_ENDPOINT,
  38
  39         .bEndpointAddress = USB_DIR_OUT,
  40         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  41         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  42 };
  43
  44 static const struct usb_endpoint_descriptor
  45 ctrl_endpt_in_desc = {
  46         .bLength         = USB_DT_ENDPOINT_SIZE,
  47         .bDescriptorType = USB_DT_ENDPOINT,
  48
  49         .bEndpointAddress = USB_DIR_IN,
  50         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  51         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  52 };
  53
  54 /**
  55  * hw_ep_bit: calculates the bit number
  56  * @num: endpoint number
  57  * @dir: endpoint direction
  58  *
  59  * This function returns bit number
  60  */
  61 static inline int hw_ep_bit(int num, int dir)
  62 {
  63         return num + (dir ? 16 : 0);
  64 }
  65
  66 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
  67 {
  68         int fill = 16 - ci->hw_ep_max / 2;
  69
  70         if (n >= ci->hw_ep_max / 2)
  71                 n += fill;
  72
  73         return n;
  74 }
  75
  76 /**
  77  * hw_device_state: enables/disables interrupts (execute without interruption)
  78  * @dma: 0 => disable, !0 => enable and set dma engine
  79  *
  80  * This function returns an error code
  81  */
  82 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
  83 {
  84         if (dma) {
  85                 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
  86                 /* interrupt, error, port change, reset, sleep/suspend */
  87                 hw_write(ci, OP_USBINTR, ~0,
  88                              USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
  89         } else {
  90                 hw_write(ci, OP_USBINTR, ~0, 0);
  91         }
  92         return 0;
  93 }
  94
  95 /**
  96  * hw_ep_flush: flush endpoint fifo (execute without interruption)
  97  * @num: endpoint number
  98  * @dir: endpoint direction
  99  *
 100  * This function returns an error code
 101  */
 102 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
 103 {
 104         int n = hw_ep_bit(num, dir);
 105
 106         do {
 107                 /* flush any pending transfer */
 108                 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
 109                 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
 110                         cpu_relax();
 111         } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
 112
 113         return 0;
 114 }
 115
 116 /**
 117  * hw_ep_disable: disables endpoint (execute without interruption)
 118  * @num: endpoint number
 119  * @dir: endpoint direction
 120  *
 121  * This function returns an error code
 122  */
 123 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
 124 {
 125         hw_ep_flush(ci, num, dir);
 126         hw_write(ci, OP_ENDPTCTRL + num,
 127                  dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 128         return 0;
 129 }
 130
 131 /**
 132  * hw_ep_enable: enables endpoint (execute without interruption)
 133  * @num:  endpoint number
 134  * @dir:  endpoint direction
 135  * @type: endpoint type
 136  *
 137  * This function returns an error code
 138  */
 139 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
 140 {
 141         u32 mask, data;
 142
 143         if (dir) {
 144                 mask  = ENDPTCTRL_TXT;  /* type    */
 145                 data  = type << __ffs(mask);
 146
 147                 mask |= ENDPTCTRL_TXS;  /* unstall */
 148                 mask |= ENDPTCTRL_TXR;  /* reset data toggle */
 149                 data |= ENDPTCTRL_TXR;
 150                 mask |= ENDPTCTRL_TXE;  /* enable  */
 151                 data |= ENDPTCTRL_TXE;
 152         } else {
 153                 mask  = ENDPTCTRL_RXT;  /* type    */
 154                 data  = type << __ffs(mask);
 155
 156                 mask |= ENDPTCTRL_RXS;  /* unstall */
 157                 mask |= ENDPTCTRL_RXR;  /* reset data toggle */
 158                 data |= ENDPTCTRL_RXR;
 159                 mask |= ENDPTCTRL_RXE;  /* enable  */
 160                 data |= ENDPTCTRL_RXE;
 161         }
 162         hw_write(ci, OP_ENDPTCTRL + num, mask, data);
 163         return 0;
 164 }
 165
 166 /**
 167  * hw_ep_get_halt: return endpoint halt status
 168  * @num: endpoint number
 169  * @dir: endpoint direction
 170  *
 171  * This function returns 1 if endpoint halted
 172  */
 173 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
 174 {
 175         u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 176
 177         return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
 178 }
 179
 180 /**
 181  * hw_ep_prime: primes endpoint (execute without interruption)
 182  * @num:     endpoint number
 183  * @dir:     endpoint direction
 184  * @is_ctrl: true if control endpoint
 185  *
 186  * This function returns an error code
 187  */
 188 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
 189 {
 190         int n = hw_ep_bit(num, dir);
 191
 192         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 193                 return -EAGAIN;
 194
 195         hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
 196
 197         while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 198                 cpu_relax();
 199         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 200                 return -EAGAIN;
 201
 202         /* status shoult be tested according with manual but it doesn't work */
 203         return 0;
 204 }
 205
 206 /**
 207  * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
 208  *                 without interruption)
 209  * @num:   endpoint number
 210  * @dir:   endpoint direction
 211  * @value: true => stall, false => unstall
 212  *
 213  * This function returns an error code
 214  */
 215 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
 216 {
 217         if (value != 0 && value != 1)
 218                 return -EINVAL;
 219
 220         do {
 221                 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
 222                 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 223                 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
 224
 225                 /* data toggle - reserved for EP0 but it's in ESS */
 226                 hw_write(ci, reg, mask_xs|mask_xr,
 227                           value ? mask_xs : mask_xr);
 228         } while (value != hw_ep_get_halt(ci, num, dir));
 229
 230         return 0;
 231 }
 232
 233 /**
 234  * hw_is_port_high_speed: test if port is high speed
 235  *
 236  * This function returns true if high speed port
 237  */
 238 static int hw_port_is_high_speed(struct ci_hdrc *ci)
 239 {
 240         return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
 241                 hw_read(ci, OP_PORTSC, PORTSC_HSP);
 242 }
 243
 244 /**
 245  * hw_test_and_clear_complete: test & clear complete status (execute without
 246  *                             interruption)
 247  * @n: endpoint number
 248  *
 249  * This function returns complete status
 250  */
 251 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
 252 {
 253         n = ep_to_bit(ci, n);
 254         return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
 255 }
 256
 257 /**
 258  * hw_test_and_clear_intr_active: test & clear active interrupts (execute
 259  *                                without interruption)
 260  *
 261  * This function returns active interrutps
 262  */
 263 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
 264 {
 265         u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
 266
 267         hw_write(ci, OP_USBSTS, ~0, reg);
 268         return reg;
 269 }
 270
 271 /**
 272  * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
 273  *                                interruption)
 274  *
 275  * This function returns guard value
 276  */
 277 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
 278 {
 279         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
 280 }
 281
 282 /**
 283  * hw_test_and_set_setup_guard: test & set setup guard (execute without
 284  *                              interruption)
 285  *
 286  * This function returns guard value
 287  */
 288 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
 289 {
 290         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
 291 }
 292
 293 /**
 294  * hw_usb_set_address: configures USB address (execute without interruption)
 295  * @value: new USB address
 296  *
 297  * This function explicitly sets the address, without the "USBADRA" (advance)
 298  * feature, which is not supported by older versions of the controller.
 299  */
 300 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
 301 {
 302         hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
 303                  value << __ffs(DEVICEADDR_USBADR));
 304 }
 305
 306 /**
 307  * hw_usb_reset: restart device after a bus reset (execute without
 308  *               interruption)
 309  *
 310  * This function returns an error code
 311  */
 312 static int hw_usb_reset(struct ci_hdrc *ci)
 313 {
 314         hw_usb_set_address(ci, 0);
 315
 316         /* ESS flushes only at end?!? */
 317         hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
 318
 319         /* clear setup token semaphores */
 320         hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
 321
 322         /* clear complete status */
 323         hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
 324
 325         /* wait until all bits cleared */
 326         while (hw_read(ci, OP_ENDPTPRIME, ~0))
 327                 udelay(10);             /* not RTOS friendly */
 328
 329         /* reset all endpoints ? */
 330
 331         /* reset internal status and wait for further instructions
 332            no need to verify the port reset status (ESS does it) */
 333
 334         return 0;
 335 }
 336
 337 /******************************************************************************
 338  * UTIL block
 339  *****************************************************************************/
 340
 341 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 342                           unsigned length)
 343 {
 344         int i;
 345         u32 temp;
 346         struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
 347                                                   GFP_ATOMIC);
 348
 349         if (node == NULL)
 350                 return -ENOMEM;
 351
 352         node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC,
 353                                    &node->dma);
 354         if (node->ptr == NULL) {
 355                 kfree(node);
 356                 return -ENOMEM;
 357         }
 358
 359         memset(node->ptr, 0, sizeof(struct ci_hw_td));
 360         node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
 361         node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
 362         node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
 363         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
 364                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 365
 366                 if (hwreq->req.length == 0
 367                                 || hwreq->req.length % hwep->ep.maxpacket)
 368                         mul++;
 369                 node->ptr->token |= mul << __ffs(TD_MULTO);
 370         }
 371
 372         temp = (u32) (hwreq->req.dma + hwreq->req.actual);
 373         if (length) {
 374                 node->ptr->page[0] = cpu_to_le32(temp);
 375                 for (i = 1; i < TD_PAGE_COUNT; i++) {
 376                         u32 page = temp + i * CI_HDRC_PAGE_SIZE;
 377                         page &= ~TD_RESERVED_MASK;
 378                         node->ptr->page[i] = cpu_to_le32(page);
 379                 }
 380         }
 381
 382         hwreq->req.actual += length;
 383
 384         if (!list_empty(&hwreq->tds)) {
 385                 /* get the last entry */
 386                 lastnode = list_entry(hwreq->tds.prev,
 387                                 struct td_node, td);
 388                 lastnode->ptr->next = cpu_to_le32(node->dma);
 389         }
 390
 391         INIT_LIST_HEAD(&node->td);
 392         list_add_tail(&node->td, &hwreq->tds);
 393
 394         return 0;
 395 }
 396
 397 /**
 398  * _usb_addr: calculates endpoint address from direction & number
 399  * @ep:  endpoint
 400  */
 401 static inline u8 _usb_addr(struct ci_hw_ep *ep)
 402 {
 403         return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
 404 }
 405
 406 /**
 407  * _hardware_queue: configures a request at hardware level
 408  * @gadget: gadget
 409  * @hwep:   endpoint
 410  *
 411  * This function returns an error code
 412  */
 413 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 414 {
 415         struct ci_hdrc *ci = hwep->ci;
 416         int ret = 0;
 417         unsigned rest = hwreq->req.length;
 418         int pages = TD_PAGE_COUNT;
 419         struct td_node *firstnode, *lastnode;
 420
 421         /* don't queue twice */
 422         if (hwreq->req.status == -EALREADY)
 423                 return -EALREADY;
 424
 425         hwreq->req.status = -EALREADY;
 426
 427         ret = usb_gadget_map_request(&ci->gadget, &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                 add_td_to_list(hwep, hwreq, 0);
 440
 441         while (rest > 0) {
 442                 unsigned count = min(hwreq->req.length - hwreq->req.actual,
 443                                         (unsigned)(pages * CI_HDRC_PAGE_SIZE));
 444                 add_td_to_list(hwep, hwreq, count);
 445                 rest -= count;
 446         }
 447
 448         if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
 449             && (hwreq->req.length % hwep->ep.maxpacket == 0))
 450                 add_td_to_list(hwep, hwreq, 0);
 451
 452         firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 453
 454         lastnode = list_entry(hwreq->tds.prev,
 455                 struct td_node, td);
 456
 457         lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
 458         if (!hwreq->req.no_interrupt)
 459                 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
 460         wmb();
 461
 462         hwreq->req.actual = 0;
 463         if (!list_empty(&hwep->qh.queue)) {
 464                 struct ci_hw_req *hwreqprev;
 465                 int n = hw_ep_bit(hwep->num, hwep->dir);
 466                 int tmp_stat;
 467                 struct td_node *prevlastnode;
 468                 u32 next = firstnode->dma & TD_ADDR_MASK;
 469
 470                 hwreqprev = list_entry(hwep->qh.queue.prev,
 471                                 struct ci_hw_req, queue);
 472                 prevlastnode = list_entry(hwreqprev->tds.prev,
 473                                 struct td_node, td);
 474
 475                 prevlastnode->ptr->next = cpu_to_le32(next);
 476                 wmb();
 477                 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 478                         goto done;
 479                 do {
 480                         hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
 481                         tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
 482                 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
 483                 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
 484                 if (tmp_stat)
 485                         goto done;
 486         }
 487
 488         /*  QH configuration */
 489         hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
 490         hwep->qh.ptr->td.token &=
 491                 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
 492
 493         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
 494                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 495
 496                 if (hwreq->req.length == 0
 497                                 || hwreq->req.length % hwep->ep.maxpacket)
 498                         mul++;
 499                 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
 500         }
 501
 502         wmb();   /* synchronize before ep prime */
 503
 504         ret = hw_ep_prime(ci, hwep->num, hwep->dir,
 505                            hwep->type == USB_ENDPOINT_XFER_CONTROL);
 506 done:
 507         return ret;
 508 }
 509
 510 /*
 511  * free_pending_td: remove a pending request for the endpoint
 512  * @hwep: endpoint
 513  */
 514 static void free_pending_td(struct ci_hw_ep *hwep)
 515 {
 516         struct td_node *pending = hwep->pending_td;
 517
 518         dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
 519         hwep->pending_td = NULL;
 520         kfree(pending);
 521 }
 522
 523 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
 524                                            struct td_node *node)
 525 {
 526         hwep->qh.ptr->td.next = node->dma;
 527         hwep->qh.ptr->td.token &=
 528                 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
 529
 530         /* Synchronize before ep prime */
 531         wmb();
 532
 533         return hw_ep_prime(ci, hwep->num, hwep->dir,
 534                                 hwep->type == USB_ENDPOINT_XFER_CONTROL);
 535 }
 536
 537 /**
 538  * _hardware_dequeue: handles a request at hardware level
 539  * @gadget: gadget
 540  * @hwep:   endpoint
 541  *
 542  * This function returns an error code
 543  */
 544 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 545 {
 546         u32 tmptoken;
 547         struct td_node *node, *tmpnode;
 548         unsigned remaining_length;
 549         unsigned actual = hwreq->req.length;
 550         struct ci_hdrc *ci = hwep->ci;
 551
 552         if (hwreq->req.status != -EALREADY)
 553                 return -EINVAL;
 554
 555         hwreq->req.status = 0;
 556
 557         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 558                 tmptoken = le32_to_cpu(node->ptr->token);
 559                 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
 560                         int n = hw_ep_bit(hwep->num, hwep->dir);
 561
 562                         if (ci->rev == CI_REVISION_24)
 563                                 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 564                                         reprime_dtd(ci, hwep, node);
 565                         hwreq->req.status = -EALREADY;
 566                         return -EBUSY;
 567                 }
 568
 569                 remaining_length = (tmptoken & TD_TOTAL_BYTES);
 570                 remaining_length >>= __ffs(TD_TOTAL_BYTES);
 571                 actual -= remaining_length;
 572
 573                 hwreq->req.status = tmptoken & TD_STATUS;
 574                 if ((TD_STATUS_HALTED & hwreq->req.status)) {
 575                         hwreq->req.status = -EPIPE;
 576                         break;
 577                 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
 578                         hwreq->req.status = -EPROTO;
 579                         break;
 580                 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
 581                         hwreq->req.status = -EILSEQ;
 582                         break;
 583                 }
 584
 585                 if (remaining_length) {
 586                         if (hwep->dir) {
 587                                 hwreq->req.status = -EPROTO;
 588                                 break;
 589                         }
 590                 }
 591                 /*
 592                  * As the hardware could still address the freed td
 593                  * which will run the udc unusable, the cleanup of the
 594                  * td has to be delayed by one.
 595                  */
 596                 if (hwep->pending_td)
 597                         free_pending_td(hwep);
 598
 599                 hwep->pending_td = node;
 600                 list_del_init(&node->td);
 601         }
 602
 603         usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
 604
 605         hwreq->req.actual += actual;
 606
 607         if (hwreq->req.status)
 608                 return hwreq->req.status;
 609
 610         return hwreq->req.actual;
 611 }
 612
 613 /**
 614  * _ep_nuke: dequeues all endpoint requests
 615  * @hwep: endpoint
 616  *
 617  * This function returns an error code
 618  * Caller must hold lock
 619  */
 620 static int _ep_nuke(struct ci_hw_ep *hwep)
 621 __releases(hwep->lock)
 622 __acquires(hwep->lock)
 623 {
 624         struct td_node *node, *tmpnode;
 625         if (hwep == NULL)
 626                 return -EINVAL;
 627
 628         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
 629
 630         while (!list_empty(&hwep->qh.queue)) {
 631
 632                 /* pop oldest request */
 633                 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
 634                                                      struct ci_hw_req, queue);
 635
 636                 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 637                         dma_pool_free(hwep->td_pool, node->ptr, node->dma);
 638                         list_del_init(&node->td);
 639                         node->ptr = NULL;
 640                         kfree(node);
 641                 }
 642
 643                 list_del_init(&hwreq->queue);
 644                 hwreq->req.status = -ESHUTDOWN;
 645
 646                 if (hwreq->req.complete != NULL) {
 647                         spin_unlock(hwep->lock);
 648                         usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
 649                         spin_lock(hwep->lock);
 650                 }
 651         }
 652
 653         if (hwep->pending_td)
 654                 free_pending_td(hwep);
 655
 656         return 0;
 657 }
 658
 659 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
 660 {
 661         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
 662         int direction, retval = 0;
 663         unsigned long flags;
 664
 665         if (ep == NULL || hwep->ep.desc == NULL)
 666                 return -EINVAL;
 667
 668         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
 669                 return -EOPNOTSUPP;
 670
 671         spin_lock_irqsave(hwep->lock, flags);
 672
 673         if (value && hwep->dir == TX && check_transfer &&
 674                 !list_empty(&hwep->qh.queue) &&
 675                         !usb_endpoint_xfer_control(hwep->ep.desc)) {
 676                 spin_unlock_irqrestore(hwep->lock, flags);
 677                 return -EAGAIN;
 678         }
 679
 680         direction = hwep->dir;
 681         do {
 682                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
 683
 684                 if (!value)
 685                         hwep->wedge = 0;
 686
 687                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
 688                         hwep->dir = (hwep->dir == TX) ? RX : TX;
 689
 690         } while (hwep->dir != direction);
 691
 692         spin_unlock_irqrestore(hwep->lock, flags);
 693         return retval;
 694 }
 695
 696
 697 /**
 698  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 699  * @gadget: gadget
 700  *
 701  * This function returns an error code
 702  */
 703 static int _gadget_stop_activity(struct usb_gadget *gadget)
 704 {
 705         struct usb_ep *ep;
 706         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 707         unsigned long flags;
 708
 709         spin_lock_irqsave(&ci->lock, flags);
 710         ci->gadget.speed = USB_SPEED_UNKNOWN;
 711         ci->remote_wakeup = 0;
 712         ci->suspended = 0;
 713         spin_unlock_irqrestore(&ci->lock, flags);
 714
 715         /* flush all endpoints */
 716         gadget_for_each_ep(ep, gadget) {
 717                 usb_ep_fifo_flush(ep);
 718         }
 719         usb_ep_fifo_flush(&ci->ep0out->ep);
 720         usb_ep_fifo_flush(&ci->ep0in->ep);
 721
 722         /* make sure to disable all endpoints */
 723         gadget_for_each_ep(ep, gadget) {
 724                 usb_ep_disable(ep);
 725         }
 726
 727         if (ci->status != NULL) {
 728                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 729                 ci->status = NULL;
 730         }
 731
 732         return 0;
 733 }
 734
 735 /******************************************************************************
 736  * ISR block
 737  *****************************************************************************/
 738 /**
 739  * isr_reset_handler: USB reset interrupt handler
 740  * @ci: UDC device
 741  *
 742  * This function resets USB engine after a bus reset occurred
 743  */
 744 static void isr_reset_handler(struct ci_hdrc *ci)
 745 __releases(ci->lock)
 746 __acquires(ci->lock)
 747 {
 748         int retval;
 749
 750         spin_unlock(&ci->lock);
 751         if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 752                 usb_gadget_udc_reset(&ci->gadget, ci->driver);
 753
 754         retval = _gadget_stop_activity(&ci->gadget);
 755         if (retval)
 756                 goto done;
 757
 758         retval = hw_usb_reset(ci);
 759         if (retval)
 760                 goto done;
 761
 762         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 763         if (ci->status == NULL)
 764                 retval = -ENOMEM;
 765
 766 done:
 767         spin_lock(&ci->lock);
 768
 769         if (retval)
 770                 dev_err(ci->dev, "error: %i\n", retval);
 771 }
 772
 773 /**
 774  * isr_get_status_complete: get_status request complete function
 775  * @ep:  endpoint
 776  * @req: request handled
 777  *
 778  * Caller must release lock
 779  */
 780 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 781 {
 782         if (ep == NULL || req == NULL)
 783                 return;
 784
 785         kfree(req->buf);
 786         usb_ep_free_request(ep, req);
 787 }
 788
 789 /**
 790  * _ep_queue: queues (submits) an I/O request to an endpoint
 791  *
 792  * Caller must hold lock
 793  */
 794 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 795                     gfp_t __maybe_unused gfp_flags)
 796 {
 797         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 798         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 799         struct ci_hdrc *ci = hwep->ci;
 800         int retval = 0;
 801
 802         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 803                 return -EINVAL;
 804
 805         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 806                 if (req->length)
 807                         hwep = (ci->ep0_dir == RX) ?
 808                                ci->ep0out : ci->ep0in;
 809                 if (!list_empty(&hwep->qh.queue)) {
 810                         _ep_nuke(hwep);
 811                         retval = -EOVERFLOW;
 812                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 813                                  _usb_addr(hwep));
 814                 }
 815         }
 816
 817         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 818             hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
 819                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 820                 return -EMSGSIZE;
 821         }
 822
 823         /* first nuke then test link, e.g. previous status has not sent */
 824         if (!list_empty(&hwreq->queue)) {
 825                 dev_err(hwep->ci->dev, "request already in queue\n");
 826                 return -EBUSY;
 827         }
 828
 829         /* push request */
 830         hwreq->req.status = -EINPROGRESS;
 831         hwreq->req.actual = 0;
 832
 833         retval = _hardware_enqueue(hwep, hwreq);
 834
 835         if (retval == -EALREADY)
 836                 retval = 0;
 837         if (!retval)
 838                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
 839
 840         return retval;
 841 }
 842
 843 /**
 844  * isr_get_status_response: get_status request response
 845  * @ci: ci struct
 846  * @setup: setup request packet
 847  *
 848  * This function returns an error code
 849  */
 850 static int isr_get_status_response(struct ci_hdrc *ci,
 851                                    struct usb_ctrlrequest *setup)
 852 __releases(hwep->lock)
 853 __acquires(hwep->lock)
 854 {
 855         struct ci_hw_ep *hwep = ci->ep0in;
 856         struct usb_request *req = NULL;
 857         gfp_t gfp_flags = GFP_ATOMIC;
 858         int dir, num, retval;
 859
 860         if (hwep == NULL || setup == NULL)
 861                 return -EINVAL;
 862
 863         spin_unlock(hwep->lock);
 864         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 865         spin_lock(hwep->lock);
 866         if (req == NULL)
 867                 return -ENOMEM;
 868
 869         req->complete = isr_get_status_complete;
 870         req->length   = 2;
 871         req->buf      = kzalloc(req->length, gfp_flags);
 872         if (req->buf == NULL) {
 873                 retval = -ENOMEM;
 874                 goto err_free_req;
 875         }
 876
 877         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
 878                 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
 879                         ci->gadget.is_selfpowered;
 880         } else if ((setup->bRequestType & USB_RECIP_MASK) \
 881                    == USB_RECIP_ENDPOINT) {
 882                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
 883                         TX : RX;
 884                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 885                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
 886         }
 887         /* else do nothing; reserved for future use */
 888
 889         retval = _ep_queue(&hwep->ep, req, gfp_flags);
 890         if (retval)
 891                 goto err_free_buf;
 892
 893         return 0;
 894
 895  err_free_buf:
 896         kfree(req->buf);
 897  err_free_req:
 898         spin_unlock(hwep->lock);
 899         usb_ep_free_request(&hwep->ep, req);
 900         spin_lock(hwep->lock);
 901         return retval;
 902 }
 903
 904 /**
 905  * isr_setup_status_complete: setup_status request complete function
 906  * @ep:  endpoint
 907  * @req: request handled
 908  *
 909  * Caller must release lock. Put the port in test mode if test mode
 910  * feature is selected.
 911  */
 912 static void
 913 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
 914 {
 915         struct ci_hdrc *ci = req->context;
 916         unsigned long flags;
 917
 918         if (ci->setaddr) {
 919                 hw_usb_set_address(ci, ci->address);
 920                 ci->setaddr = false;
 921                 if (ci->address)
 922                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
 923         }
 924
 925         spin_lock_irqsave(&ci->lock, flags);
 926         if (ci->test_mode)
 927                 hw_port_test_set(ci, ci->test_mode);
 928         spin_unlock_irqrestore(&ci->lock, flags);
 929 }
 930
 931 /**
 932  * isr_setup_status_phase: queues the status phase of a setup transation
 933  * @ci: ci struct
 934  *
 935  * This function returns an error code
 936  */
 937 static int isr_setup_status_phase(struct ci_hdrc *ci)
 938 {
 939         int retval;
 940         struct ci_hw_ep *hwep;
 941
 942         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
 943         ci->status->context = ci;
 944         ci->status->complete = isr_setup_status_complete;
 945
 946         retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
 947
 948         return retval;
 949 }
 950
 951 /**
 952  * isr_tr_complete_low: transaction complete low level handler
 953  * @hwep: endpoint
 954  *
 955  * This function returns an error code
 956  * Caller must hold lock
 957  */
 958 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
 959 __releases(hwep->lock)
 960 __acquires(hwep->lock)
 961 {
 962         struct ci_hw_req *hwreq, *hwreqtemp;
 963         struct ci_hw_ep *hweptemp = hwep;
 964         int retval = 0;
 965
 966         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
 967                         queue) {
 968                 retval = _hardware_dequeue(hwep, hwreq);
 969                 if (retval < 0)
 970                         break;
 971                 list_del_init(&hwreq->queue);
 972                 if (hwreq->req.complete != NULL) {
 973                         spin_unlock(hwep->lock);
 974                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
 975                                         hwreq->req.length)
 976                                 hweptemp = hwep->ci->ep0in;
 977                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
 978                         spin_lock(hwep->lock);
 979                 }
 980         }
 981
 982         if (retval == -EBUSY)
 983                 retval = 0;
 984
 985         return retval;
 986 }
 987
 988 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
 989 {
 990         dev_warn(&ci->gadget.dev,
 991                 "connect the device to an alternate port if you want HNP\n");
 992         return isr_setup_status_phase(ci);
 993 }
 994
 995 /**
 996  * isr_setup_packet_handler: setup packet handler
 997  * @ci: UDC descriptor
 998  *
 999  * This function handles setup packet
1000  */
1001 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1002 __releases(ci->lock)
1003 __acquires(ci->lock)
1004 {
1005         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1006         struct usb_ctrlrequest req;
1007         int type, num, dir, err = -EINVAL;
1008         u8 tmode = 0;
1009
1010         /*
1011          * Flush data and handshake transactions of previous
1012          * setup packet.
1013          */
1014         _ep_nuke(ci->ep0out);
1015         _ep_nuke(ci->ep0in);
1016
1017         /* read_setup_packet */
1018         do {
1019                 hw_test_and_set_setup_guard(ci);
1020                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1021         } while (!hw_test_and_clear_setup_guard(ci));
1022
1023         type = req.bRequestType;
1024
1025         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1026
1027         switch (req.bRequest) {
1028         case USB_REQ_CLEAR_FEATURE:
1029                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1030                                 le16_to_cpu(req.wValue) ==
1031                                 USB_ENDPOINT_HALT) {
1032                         if (req.wLength != 0)
1033                                 break;
1034                         num  = le16_to_cpu(req.wIndex);
1035                         dir = num & USB_ENDPOINT_DIR_MASK;
1036                         num &= USB_ENDPOINT_NUMBER_MASK;
1037                         if (dir) /* TX */
1038                                 num += ci->hw_ep_max / 2;
1039                         if (!ci->ci_hw_ep[num].wedge) {
1040                                 spin_unlock(&ci->lock);
1041                                 err = usb_ep_clear_halt(
1042                                         &ci->ci_hw_ep[num].ep);
1043                                 spin_lock(&ci->lock);
1044                                 if (err)
1045                                         break;
1046                         }
1047                         err = isr_setup_status_phase(ci);
1048                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1049                                 le16_to_cpu(req.wValue) ==
1050                                 USB_DEVICE_REMOTE_WAKEUP) {
1051                         if (req.wLength != 0)
1052                                 break;
1053                         ci->remote_wakeup = 0;
1054                         err = isr_setup_status_phase(ci);
1055                 } else {
1056                         goto delegate;
1057                 }
1058                 break;
1059         case USB_REQ_GET_STATUS:
1060                 if (type != (USB_DIR_IN|USB_RECIP_DEVICE)   &&
1061                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1062                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1063                         goto delegate;
1064                 if (le16_to_cpu(req.wLength) != 2 ||
1065                     le16_to_cpu(req.wValue)  != 0)
1066                         break;
1067                 err = isr_get_status_response(ci, &req);
1068                 break;
1069         case USB_REQ_SET_ADDRESS:
1070                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1071                         goto delegate;
1072                 if (le16_to_cpu(req.wLength) != 0 ||
1073                     le16_to_cpu(req.wIndex)  != 0)
1074                         break;
1075                 ci->address = (u8)le16_to_cpu(req.wValue);
1076                 ci->setaddr = true;
1077                 err = isr_setup_status_phase(ci);
1078                 break;
1079         case USB_REQ_SET_FEATURE:
1080                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1081                                 le16_to_cpu(req.wValue) ==
1082                                 USB_ENDPOINT_HALT) {
1083                         if (req.wLength != 0)
1084                                 break;
1085                         num  = le16_to_cpu(req.wIndex);
1086                         dir = num & USB_ENDPOINT_DIR_MASK;
1087                         num &= USB_ENDPOINT_NUMBER_MASK;
1088                         if (dir) /* TX */
1089                                 num += ci->hw_ep_max / 2;
1090
1091                         spin_unlock(&ci->lock);
1092                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1093                         spin_lock(&ci->lock);
1094                         if (!err)
1095                                 isr_setup_status_phase(ci);
1096                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1097                         if (req.wLength != 0)
1098                                 break;
1099                         switch (le16_to_cpu(req.wValue)) {
1100                         case USB_DEVICE_REMOTE_WAKEUP:
1101                                 ci->remote_wakeup = 1;
1102                                 err = isr_setup_status_phase(ci);
1103                                 break;
1104                         case USB_DEVICE_TEST_MODE:
1105                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1106                                 switch (tmode) {
1107                                 case TEST_J:
1108                                 case TEST_K:
1109                                 case TEST_SE0_NAK:
1110                                 case TEST_PACKET:
1111                                 case TEST_FORCE_EN:
1112                                         ci->test_mode = tmode;
1113                                         err = isr_setup_status_phase(
1114                                                         ci);
1115                                         break;
1116                                 default:
1117                                         break;
1118                                 }
1119                                 break;
1120                         case USB_DEVICE_B_HNP_ENABLE:
1121                                 if (ci_otg_is_fsm_mode(ci)) {
1122                                         ci->gadget.b_hnp_enable = 1;
1123                                         err = isr_setup_status_phase(
1124                                                         ci);
1125                                 }
1126                                 break;
1127                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1128                                 if (ci_otg_is_fsm_mode(ci))
1129                                         err = otg_a_alt_hnp_support(ci);
1130                                 break;
1131                         case USB_DEVICE_A_HNP_SUPPORT:
1132                                 if (ci_otg_is_fsm_mode(ci)) {
1133                                         ci->gadget.a_hnp_support = 1;
1134                                         err = isr_setup_status_phase(
1135                                                         ci);
1136                                 }
1137                                 break;
1138                         default:
1139                                 goto delegate;
1140                         }
1141                 } else {
1142                         goto delegate;
1143                 }
1144                 break;
1145         default:
1146 delegate:
1147                 if (req.wLength == 0)   /* no data phase */
1148                         ci->ep0_dir = TX;
1149
1150                 spin_unlock(&ci->lock);
1151                 err = ci->driver->setup(&ci->gadget, &req);
1152                 spin_lock(&ci->lock);
1153                 break;
1154         }
1155
1156         if (err < 0) {
1157                 spin_unlock(&ci->lock);
1158                 if (_ep_set_halt(&hwep->ep, 1, false))
1159                         dev_err(ci->dev, "error: _ep_set_halt\n");
1160                 spin_lock(&ci->lock);
1161         }
1162 }
1163
1164 /**
1165  * isr_tr_complete_handler: transaction complete interrupt handler
1166  * @ci: UDC descriptor
1167  *
1168  * This function handles traffic events
1169  */
1170 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1171 __releases(ci->lock)
1172 __acquires(ci->lock)
1173 {
1174         unsigned i;
1175         int err;
1176
1177         for (i = 0; i < ci->hw_ep_max; i++) {
1178                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1179
1180                 if (hwep->ep.desc == NULL)
1181                         continue;   /* not configured */
1182
1183                 if (hw_test_and_clear_complete(ci, i)) {
1184                         err = isr_tr_complete_low(hwep);
1185                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1186                                 if (err > 0)   /* needs status phase */
1187                                         err = isr_setup_status_phase(ci);
1188                                 if (err < 0) {
1189                                         spin_unlock(&ci->lock);
1190                                         if (_ep_set_halt(&hwep->ep, 1, false))
1191                                                 dev_err(ci->dev,
1192                                                 "error: _ep_set_halt\n");
1193                                         spin_lock(&ci->lock);
1194                                 }
1195                         }
1196                 }
1197
1198                 /* Only handle setup packet below */
1199                 if (i == 0 &&
1200                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1201                         isr_setup_packet_handler(ci);
1202         }
1203 }
1204
1205 /******************************************************************************
1206  * ENDPT block
1207  *****************************************************************************/
1208 /**
1209  * ep_enable: configure endpoint, making it usable
1210  *
1211  * Check usb_ep_enable() at "usb_gadget.h" for details
1212  */
1213 static int ep_enable(struct usb_ep *ep,
1214                      const struct usb_endpoint_descriptor *desc)
1215 {
1216         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1217         int retval = 0;
1218         unsigned long flags;
1219         u32 cap = 0;
1220
1221         if (ep == NULL || desc == NULL)
1222                 return -EINVAL;
1223
1224         spin_lock_irqsave(hwep->lock, flags);
1225
1226         /* only internal SW should enable ctrl endpts */
1227
1228         if (!list_empty(&hwep->qh.queue)) {
1229                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1230                 spin_unlock_irqrestore(hwep->lock, flags);
1231                 return -EBUSY;
1232         }
1233
1234         hwep->ep.desc = desc;
1235
1236         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1237         hwep->num  = usb_endpoint_num(desc);
1238         hwep->type = usb_endpoint_type(desc);
1239
1240         hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1241         hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1242
1243         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1244                 cap |= QH_IOS;
1245
1246         cap |= QH_ZLT;
1247         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1248         /*
1249          * For ISO-TX, we set mult at QH as the largest value, and use
1250          * MultO at TD as real mult value.
1251          */
1252         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1253                 cap |= 3 << __ffs(QH_MULT);
1254
1255         hwep->qh.ptr->cap = cpu_to_le32(cap);
1256
1257         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1258
1259         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1260                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1261                 retval = -EINVAL;
1262         }
1263
1264         /*
1265          * Enable endpoints in the HW other than ep0 as ep0
1266          * is always enabled
1267          */
1268         if (hwep->num)
1269                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1270                                        hwep->type);
1271
1272         spin_unlock_irqrestore(hwep->lock, flags);
1273         return retval;
1274 }
1275
1276 /**
1277  * ep_disable: endpoint is no longer usable
1278  *
1279  * Check usb_ep_disable() at "usb_gadget.h" for details
1280  */
1281 static int ep_disable(struct usb_ep *ep)
1282 {
1283         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1284         int direction, retval = 0;
1285         unsigned long flags;
1286
1287         if (ep == NULL)
1288                 return -EINVAL;
1289         else if (hwep->ep.desc == NULL)
1290                 return -EBUSY;
1291
1292         spin_lock_irqsave(hwep->lock, flags);
1293
1294         /* only internal SW should disable ctrl endpts */
1295
1296         direction = hwep->dir;
1297         do {
1298                 retval |= _ep_nuke(hwep);
1299                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1300
1301                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1302                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1303
1304         } while (hwep->dir != direction);
1305
1306         hwep->ep.desc = NULL;
1307
1308         spin_unlock_irqrestore(hwep->lock, flags);
1309         return retval;
1310 }
1311
1312 /**
1313  * ep_alloc_request: allocate a request object to use with this endpoint
1314  *
1315  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1316  */
1317 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1318 {
1319         struct ci_hw_req *hwreq = NULL;
1320
1321         if (ep == NULL)
1322                 return NULL;
1323
1324         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1325         if (hwreq != NULL) {
1326                 INIT_LIST_HEAD(&hwreq->queue);
1327                 INIT_LIST_HEAD(&hwreq->tds);
1328         }
1329
1330         return (hwreq == NULL) ? NULL : &hwreq->req;
1331 }
1332
1333 /**
1334  * ep_free_request: frees a request object
1335  *
1336  * Check usb_ep_free_request() at "usb_gadget.h" for details
1337  */
1338 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1339 {
1340         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1341         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1342         struct td_node *node, *tmpnode;
1343         unsigned long flags;
1344
1345         if (ep == NULL || req == NULL) {
1346                 return;
1347         } else if (!list_empty(&hwreq->queue)) {
1348                 dev_err(hwep->ci->dev, "freeing queued request\n");
1349                 return;
1350         }
1351
1352         spin_lock_irqsave(hwep->lock, flags);
1353
1354         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1355                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1356                 list_del_init(&node->td);
1357                 node->ptr = NULL;
1358                 kfree(node);
1359         }
1360
1361         kfree(hwreq);
1362
1363         spin_unlock_irqrestore(hwep->lock, flags);
1364 }
1365
1366 /**
1367  * ep_queue: queues (submits) an I/O request to an endpoint
1368  *
1369  * Check usb_ep_queue()* at usb_gadget.h" for details
1370  */
1371 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1372                     gfp_t __maybe_unused gfp_flags)
1373 {
1374         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1375         int retval = 0;
1376         unsigned long flags;
1377
1378         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1379                 return -EINVAL;
1380
1381         spin_lock_irqsave(hwep->lock, flags);
1382         retval = _ep_queue(ep, req, gfp_flags);
1383         spin_unlock_irqrestore(hwep->lock, flags);
1384         return retval;
1385 }
1386
1387 /**
1388  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1389  *
1390  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1391  */
1392 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1393 {
1394         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1395         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1396         unsigned long flags;
1397         struct td_node *node, *tmpnode;
1398
1399         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1400                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1401                 list_empty(&hwep->qh.queue))
1402                 return -EINVAL;
1403
1404         spin_lock_irqsave(hwep->lock, flags);
1405
1406         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1407
1408         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1409                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1410                 list_del(&node->td);
1411                 kfree(node);
1412         }
1413
1414         /* pop request */
1415         list_del_init(&hwreq->queue);
1416
1417         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1418
1419         req->status = -ECONNRESET;
1420
1421         if (hwreq->req.complete != NULL) {
1422                 spin_unlock(hwep->lock);
1423                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1424                 spin_lock(hwep->lock);
1425         }
1426
1427         spin_unlock_irqrestore(hwep->lock, flags);
1428         return 0;
1429 }
1430
1431 /**
1432  * ep_set_halt: sets the endpoint halt feature
1433  *
1434  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1435  */
1436 static int ep_set_halt(struct usb_ep *ep, int value)
1437 {
1438         return _ep_set_halt(ep, value, true);
1439 }
1440
1441 /**
1442  * ep_set_wedge: sets the halt feature and ignores clear requests
1443  *
1444  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1445  */
1446 static int ep_set_wedge(struct usb_ep *ep)
1447 {
1448         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1449         unsigned long flags;
1450
1451         if (ep == NULL || hwep->ep.desc == NULL)
1452                 return -EINVAL;
1453
1454         spin_lock_irqsave(hwep->lock, flags);
1455         hwep->wedge = 1;
1456         spin_unlock_irqrestore(hwep->lock, flags);
1457
1458         return usb_ep_set_halt(ep);
1459 }
1460
1461 /**
1462  * ep_fifo_flush: flushes contents of a fifo
1463  *
1464  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1465  */
1466 static void ep_fifo_flush(struct usb_ep *ep)
1467 {
1468         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1469         unsigned long flags;
1470
1471         if (ep == NULL) {
1472                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1473                 return;
1474         }
1475
1476         spin_lock_irqsave(hwep->lock, flags);
1477
1478         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1479
1480         spin_unlock_irqrestore(hwep->lock, flags);
1481 }
1482
1483 /**
1484  * Endpoint-specific part of the API to the USB controller hardware
1485  * Check "usb_gadget.h" for details
1486  */
1487 static const struct usb_ep_ops usb_ep_ops = {
1488         .enable        = ep_enable,
1489         .disable       = ep_disable,
1490         .alloc_request = ep_alloc_request,
1491         .free_request  = ep_free_request,
1492         .queue         = ep_queue,
1493         .dequeue       = ep_dequeue,
1494         .set_halt      = ep_set_halt,
1495         .set_wedge     = ep_set_wedge,
1496         .fifo_flush    = ep_fifo_flush,
1497 };
1498
1499 /******************************************************************************
1500  * GADGET block
1501  *****************************************************************************/
1502 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1503 {
1504         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1505         unsigned long flags;
1506         int gadget_ready = 0;
1507
1508         spin_lock_irqsave(&ci->lock, flags);
1509         ci->vbus_active = is_active;
1510         if (ci->driver)
1511                 gadget_ready = 1;
1512         spin_unlock_irqrestore(&ci->lock, flags);
1513
1514         if (gadget_ready) {
1515                 if (is_active) {
1516                         pm_runtime_get_sync(&_gadget->dev);
1517                         hw_device_reset(ci);
1518                         hw_device_state(ci, ci->ep0out->qh.dma);
1519                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1520                         usb_udc_vbus_handler(_gadget, true);
1521                 } else {
1522                         usb_udc_vbus_handler(_gadget, false);
1523                         if (ci->driver)
1524                                 ci->driver->disconnect(&ci->gadget);
1525                         hw_device_state(ci, 0);
1526                         if (ci->platdata->notify_event)
1527                                 ci->platdata->notify_event(ci,
1528                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1529                         _gadget_stop_activity(&ci->gadget);
1530                         pm_runtime_put_sync(&_gadget->dev);
1531                         usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1532                 }
1533         }
1534
1535         return 0;
1536 }
1537
1538 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1539 {
1540         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1541         unsigned long flags;
1542         int ret = 0;
1543
1544         spin_lock_irqsave(&ci->lock, flags);
1545         if (!ci->remote_wakeup) {
1546                 ret = -EOPNOTSUPP;
1547                 goto out;
1548         }
1549         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1550                 ret = -EINVAL;
1551                 goto out;
1552         }
1553         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1554 out:
1555         spin_unlock_irqrestore(&ci->lock, flags);
1556         return ret;
1557 }
1558
1559 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1560 {
1561         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1562
1563         if (ci->usb_phy)
1564                 return usb_phy_set_power(ci->usb_phy, ma);
1565         return -ENOTSUPP;
1566 }
1567
1568 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1569 {
1570         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1571         struct ci_hw_ep *hwep = ci->ep0in;
1572         unsigned long flags;
1573
1574         spin_lock_irqsave(hwep->lock, flags);
1575         _gadget->is_selfpowered = (is_on != 0);
1576         spin_unlock_irqrestore(hwep->lock, flags);
1577
1578         return 0;
1579 }
1580
1581 /* Change Data+ pullup status
1582  * this func is used by usb_gadget_connect/disconnet
1583  */
1584 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1585 {
1586         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1587
1588         /* Data+ pullup controlled by OTG state machine in OTG fsm mode */
1589         if (ci_otg_is_fsm_mode(ci))
1590                 return 0;
1591
1592         pm_runtime_get_sync(&ci->gadget.dev);
1593         if (is_on)
1594                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1595         else
1596                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1597         pm_runtime_put_sync(&ci->gadget.dev);
1598
1599         return 0;
1600 }
1601
1602 static int ci_udc_start(struct usb_gadget *gadget,
1603                          struct usb_gadget_driver *driver);
1604 static int ci_udc_stop(struct usb_gadget *gadget);
1605 /**
1606  * Device operations part of the API to the USB controller hardware,
1607  * which don't involve endpoints (or i/o)
1608  * Check  "usb_gadget.h" for details
1609  */
1610 static const struct usb_gadget_ops usb_gadget_ops = {
1611         .vbus_session   = ci_udc_vbus_session,
1612         .wakeup         = ci_udc_wakeup,
1613         .set_selfpowered        = ci_udc_selfpowered,
1614         .pullup         = ci_udc_pullup,
1615         .vbus_draw      = ci_udc_vbus_draw,
1616         .udc_start      = ci_udc_start,
1617         .udc_stop       = ci_udc_stop,
1618 };
1619
1620 static int init_eps(struct ci_hdrc *ci)
1621 {
1622         int retval = 0, i, j;
1623
1624         for (i = 0; i < ci->hw_ep_max/2; i++)
1625                 for (j = RX; j <= TX; j++) {
1626                         int k = i + j * ci->hw_ep_max/2;
1627                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1628
1629                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1630                                         (j == TX)  ? "in" : "out");
1631
1632                         hwep->ci          = ci;
1633                         hwep->lock         = &ci->lock;
1634                         hwep->td_pool      = ci->td_pool;
1635
1636                         hwep->ep.name      = hwep->name;
1637                         hwep->ep.ops       = &usb_ep_ops;
1638
1639                         if (i == 0) {
1640                                 hwep->ep.caps.type_control = true;
1641                         } else {
1642                                 hwep->ep.caps.type_iso = true;
1643                                 hwep->ep.caps.type_bulk = true;
1644                                 hwep->ep.caps.type_int = true;
1645                         }
1646
1647                         if (j == TX)
1648                                 hwep->ep.caps.dir_in = true;
1649                         else
1650                                 hwep->ep.caps.dir_out = true;
1651
1652                         /*
1653                          * for ep0: maxP defined in desc, for other
1654                          * eps, maxP is set by epautoconfig() called
1655                          * by gadget layer
1656                          */
1657                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1658
1659                         INIT_LIST_HEAD(&hwep->qh.queue);
1660                         hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1661                                                      &hwep->qh.dma);
1662                         if (hwep->qh.ptr == NULL)
1663                                 retval = -ENOMEM;
1664                         else
1665                                 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1666
1667                         /*
1668                          * set up shorthands for ep0 out and in endpoints,
1669                          * don't add to gadget's ep_list
1670                          */
1671                         if (i == 0) {
1672                                 if (j == RX)
1673                                         ci->ep0out = hwep;
1674                                 else
1675                                         ci->ep0in = hwep;
1676
1677                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1678                                 continue;
1679                         }
1680
1681                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1682                 }
1683
1684         return retval;
1685 }
1686
1687 static void destroy_eps(struct ci_hdrc *ci)
1688 {
1689         int i;
1690
1691         for (i = 0; i < ci->hw_ep_max; i++) {
1692                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1693
1694                 if (hwep->pending_td)
1695                         free_pending_td(hwep);
1696                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1697         }
1698 }
1699
1700 /**
1701  * ci_udc_start: register a gadget driver
1702  * @gadget: our gadget
1703  * @driver: the driver being registered
1704  *
1705  * Interrupts are enabled here.
1706  */
1707 static int ci_udc_start(struct usb_gadget *gadget,
1708                          struct usb_gadget_driver *driver)
1709 {
1710         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1711         unsigned long flags;
1712         int retval = -ENOMEM;
1713
1714         if (driver->disconnect == NULL)
1715                 return -EINVAL;
1716
1717
1718         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1719         retval = usb_ep_enable(&ci->ep0out->ep);
1720         if (retval)
1721                 return retval;
1722
1723         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1724         retval = usb_ep_enable(&ci->ep0in->ep);
1725         if (retval)
1726                 return retval;
1727
1728         ci->driver = driver;
1729
1730         /* Start otg fsm for B-device */
1731         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1732                 ci_hdrc_otg_fsm_start(ci);
1733                 return retval;
1734         }
1735
1736         pm_runtime_get_sync(&ci->gadget.dev);
1737         if (ci->vbus_active) {
1738                 spin_lock_irqsave(&ci->lock, flags);
1739                 hw_device_reset(ci);
1740         } else {
1741                 usb_udc_vbus_handler(&ci->gadget, false);
1742                 pm_runtime_put_sync(&ci->gadget.dev);
1743                 return retval;
1744         }
1745
1746         retval = hw_device_state(ci, ci->ep0out->qh.dma);
1747         spin_unlock_irqrestore(&ci->lock, flags);
1748         if (retval)
1749                 pm_runtime_put_sync(&ci->gadget.dev);
1750
1751         return retval;
1752 }
1753
1754 /**
1755  * ci_udc_stop: unregister a gadget driver
1756  */
1757 static int ci_udc_stop(struct usb_gadget *gadget)
1758 {
1759         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1760         unsigned long flags;
1761
1762         spin_lock_irqsave(&ci->lock, flags);
1763
1764         if (ci->vbus_active) {
1765                 hw_device_state(ci, 0);
1766                 if (ci->platdata->notify_event)
1767                         ci->platdata->notify_event(ci,
1768                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1769                 spin_unlock_irqrestore(&ci->lock, flags);
1770                 _gadget_stop_activity(&ci->gadget);
1771                 spin_lock_irqsave(&ci->lock, flags);
1772                 pm_runtime_put(&ci->gadget.dev);
1773         }
1774
1775         ci->driver = NULL;
1776         spin_unlock_irqrestore(&ci->lock, flags);
1777
1778         return 0;
1779 }
1780
1781 /******************************************************************************
1782  * BUS block
1783  *****************************************************************************/
1784 /**
1785  * udc_irq: ci interrupt handler
1786  *
1787  * This function returns IRQ_HANDLED if the IRQ has been handled
1788  * It locks access to registers
1789  */
1790 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1791 {
1792         irqreturn_t retval;
1793         u32 intr;
1794
1795         if (ci == NULL)
1796                 return IRQ_HANDLED;
1797
1798         spin_lock(&ci->lock);
1799
1800         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1801                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1802                                 USBMODE_CM_DC) {
1803                         spin_unlock(&ci->lock);
1804                         return IRQ_NONE;
1805                 }
1806         }
1807         intr = hw_test_and_clear_intr_active(ci);
1808
1809         if (intr) {
1810                 /* order defines priority - do NOT change it */
1811                 if (USBi_URI & intr)
1812                         isr_reset_handler(ci);
1813
1814                 if (USBi_PCI & intr) {
1815                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
1816                                 USB_SPEED_HIGH : USB_SPEED_FULL;
1817                         if (ci->suspended && ci->driver->resume) {
1818                                 spin_unlock(&ci->lock);
1819                                 ci->driver->resume(&ci->gadget);
1820                                 spin_lock(&ci->lock);
1821                                 ci->suspended = 0;
1822                         }
1823                 }
1824
1825                 if (USBi_UI  & intr)
1826                         isr_tr_complete_handler(ci);
1827
1828                 if (USBi_SLI & intr) {
1829                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1830                             ci->driver->suspend) {
1831                                 ci->suspended = 1;
1832                                 spin_unlock(&ci->lock);
1833                                 ci->driver->suspend(&ci->gadget);
1834                                 usb_gadget_set_state(&ci->gadget,
1835                                                 USB_STATE_SUSPENDED);
1836                                 spin_lock(&ci->lock);
1837                         }
1838                 }
1839                 retval = IRQ_HANDLED;
1840         } else {
1841                 retval = IRQ_NONE;
1842         }
1843         spin_unlock(&ci->lock);
1844
1845         return retval;
1846 }
1847
1848 /**
1849  * udc_start: initialize gadget role
1850  * @ci: chipidea controller
1851  */
1852 static int udc_start(struct ci_hdrc *ci)
1853 {
1854         struct device *dev = ci->dev;
1855         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1856         int retval = 0;
1857
1858         spin_lock_init(&ci->lock);
1859
1860         ci->gadget.ops          = &usb_gadget_ops;
1861         ci->gadget.speed        = USB_SPEED_UNKNOWN;
1862         ci->gadget.max_speed    = USB_SPEED_HIGH;
1863         ci->gadget.name         = ci->platdata->name;
1864         ci->gadget.otg_caps     = otg_caps;
1865
1866         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1867                                                 otg_caps->adp_support))
1868                 ci->gadget.is_otg = 1;
1869
1870         INIT_LIST_HEAD(&ci->gadget.ep_list);
1871
1872         /* alloc resources */
1873         ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1874                                        sizeof(struct ci_hw_qh),
1875                                        64, CI_HDRC_PAGE_SIZE);
1876         if (ci->qh_pool == NULL)
1877                 return -ENOMEM;
1878
1879         ci->td_pool = dma_pool_create("ci_hw_td", dev,
1880                                        sizeof(struct ci_hw_td),
1881                                        64, CI_HDRC_PAGE_SIZE);
1882         if (ci->td_pool == NULL) {
1883                 retval = -ENOMEM;
1884                 goto free_qh_pool;
1885         }
1886
1887         retval = init_eps(ci);
1888         if (retval)
1889                 goto free_pools;
1890
1891         ci->gadget.ep0 = &ci->ep0in->ep;
1892
1893         retval = usb_add_gadget_udc(dev, &ci->gadget);
1894         if (retval)
1895                 goto destroy_eps;
1896
1897         pm_runtime_no_callbacks(&ci->gadget.dev);
1898         pm_runtime_enable(&ci->gadget.dev);
1899
1900         return retval;
1901
1902 destroy_eps:
1903         destroy_eps(ci);
1904 free_pools:
1905         dma_pool_destroy(ci->td_pool);
1906 free_qh_pool:
1907         dma_pool_destroy(ci->qh_pool);
1908         return retval;
1909 }
1910
1911 /**
1912  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1913  *
1914  * No interrupts active, the IRQ has been released
1915  */
1916 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1917 {
1918         if (!ci->roles[CI_ROLE_GADGET])
1919                 return;
1920
1921         usb_del_gadget_udc(&ci->gadget);
1922
1923         destroy_eps(ci);
1924
1925         dma_pool_destroy(ci->td_pool);
1926         dma_pool_destroy(ci->qh_pool);
1927 }
1928
1929 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1930 {
1931         if (ci->is_otg)
1932                 /* Clear and enable BSV irq */
1933                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1934                                         OTGSC_BSVIS | OTGSC_BSVIE);
1935
1936         return 0;
1937 }
1938
1939 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1940 {
1941         /*
1942          * host doesn't care B_SESSION_VALID event
1943          * so clear and disbale BSV irq
1944          */
1945         if (ci->is_otg)
1946                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1947 }
1948
1949 /**
1950  * ci_hdrc_gadget_init - initialize device related bits
1951  * ci: the controller
1952  *
1953  * This function initializes the gadget, if the device is "device capable".
1954  */
1955 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1956 {
1957         struct ci_role_driver *rdrv;
1958
1959         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1960                 return -ENXIO;
1961
1962         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1963         if (!rdrv)
1964                 return -ENOMEM;
1965
1966         rdrv->start     = udc_id_switch_for_device;
1967         rdrv->stop      = udc_id_switch_for_host;
1968         rdrv->irq       = udc_irq;
1969         rdrv->name      = "gadget";
1970         ci->roles[CI_ROLE_GADGET] = rdrv;
1971
1972         return udc_start(ci);
1973 }