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         /*
 943          * Unexpected USB controller behavior, caused by bad signal integrity
 944          * or ground reference problems, can lead to isr_setup_status_phase
 945          * being called with ci->status equal to NULL.
 946          * If this situation occurs, you should review your USB hardware design.
 947          */
 948         if (WARN_ON_ONCE(!ci->status))
 949                 return -EPIPE;
 950
 951         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
 952         ci->status->context = ci;
 953         ci->status->complete = isr_setup_status_complete;
 954
 955         retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
 956
 957         return retval;
 958 }
 959
 960 /**
 961  * isr_tr_complete_low: transaction complete low level handler
 962  * @hwep: endpoint
 963  *
 964  * This function returns an error code
 965  * Caller must hold lock
 966  */
 967 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
 968 __releases(hwep->lock)
 969 __acquires(hwep->lock)
 970 {
 971         struct ci_hw_req *hwreq, *hwreqtemp;
 972         struct ci_hw_ep *hweptemp = hwep;
 973         int retval = 0;
 974
 975         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
 976                         queue) {
 977                 retval = _hardware_dequeue(hwep, hwreq);
 978                 if (retval < 0)
 979                         break;
 980                 list_del_init(&hwreq->queue);
 981                 if (hwreq->req.complete != NULL) {
 982                         spin_unlock(hwep->lock);
 983                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
 984                                         hwreq->req.length)
 985                                 hweptemp = hwep->ci->ep0in;
 986                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
 987                         spin_lock(hwep->lock);
 988                 }
 989         }
 990
 991         if (retval == -EBUSY)
 992                 retval = 0;
 993
 994         return retval;
 995 }
 996
 997 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
 998 {
 999         dev_warn(&ci->gadget.dev,
1000                 "connect the device to an alternate port if you want HNP\n");
1001         return isr_setup_status_phase(ci);
1002 }
1003
1004 /**
1005  * isr_setup_packet_handler: setup packet handler
1006  * @ci: UDC descriptor
1007  *
1008  * This function handles setup packet
1009  */
1010 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1011 __releases(ci->lock)
1012 __acquires(ci->lock)
1013 {
1014         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1015         struct usb_ctrlrequest req;
1016         int type, num, dir, err = -EINVAL;
1017         u8 tmode = 0;
1018
1019         /*
1020          * Flush data and handshake transactions of previous
1021          * setup packet.
1022          */
1023         _ep_nuke(ci->ep0out);
1024         _ep_nuke(ci->ep0in);
1025
1026         /* read_setup_packet */
1027         do {
1028                 hw_test_and_set_setup_guard(ci);
1029                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1030         } while (!hw_test_and_clear_setup_guard(ci));
1031
1032         type = req.bRequestType;
1033
1034         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1035
1036         switch (req.bRequest) {
1037         case USB_REQ_CLEAR_FEATURE:
1038                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1039                                 le16_to_cpu(req.wValue) ==
1040                                 USB_ENDPOINT_HALT) {
1041                         if (req.wLength != 0)
1042                                 break;
1043                         num  = le16_to_cpu(req.wIndex);
1044                         dir = num & USB_ENDPOINT_DIR_MASK;
1045                         num &= USB_ENDPOINT_NUMBER_MASK;
1046                         if (dir) /* TX */
1047                                 num += ci->hw_ep_max / 2;
1048                         if (!ci->ci_hw_ep[num].wedge) {
1049                                 spin_unlock(&ci->lock);
1050                                 err = usb_ep_clear_halt(
1051                                         &ci->ci_hw_ep[num].ep);
1052                                 spin_lock(&ci->lock);
1053                                 if (err)
1054                                         break;
1055                         }
1056                         err = isr_setup_status_phase(ci);
1057                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1058                                 le16_to_cpu(req.wValue) ==
1059                                 USB_DEVICE_REMOTE_WAKEUP) {
1060                         if (req.wLength != 0)
1061                                 break;
1062                         ci->remote_wakeup = 0;
1063                         err = isr_setup_status_phase(ci);
1064                 } else {
1065                         goto delegate;
1066                 }
1067                 break;
1068         case USB_REQ_GET_STATUS:
1069                 if (type != (USB_DIR_IN|USB_RECIP_DEVICE)   &&
1070                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1071                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1072                         goto delegate;
1073                 if (le16_to_cpu(req.wLength) != 2 ||
1074                     le16_to_cpu(req.wValue)  != 0)
1075                         break;
1076                 err = isr_get_status_response(ci, &req);
1077                 break;
1078         case USB_REQ_SET_ADDRESS:
1079                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1080                         goto delegate;
1081                 if (le16_to_cpu(req.wLength) != 0 ||
1082                     le16_to_cpu(req.wIndex)  != 0)
1083                         break;
1084                 ci->address = (u8)le16_to_cpu(req.wValue);
1085                 ci->setaddr = true;
1086                 err = isr_setup_status_phase(ci);
1087                 break;
1088         case USB_REQ_SET_FEATURE:
1089                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1090                                 le16_to_cpu(req.wValue) ==
1091                                 USB_ENDPOINT_HALT) {
1092                         if (req.wLength != 0)
1093                                 break;
1094                         num  = le16_to_cpu(req.wIndex);
1095                         dir = num & USB_ENDPOINT_DIR_MASK;
1096                         num &= USB_ENDPOINT_NUMBER_MASK;
1097                         if (dir) /* TX */
1098                                 num += ci->hw_ep_max / 2;
1099
1100                         spin_unlock(&ci->lock);
1101                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1102                         spin_lock(&ci->lock);
1103                         if (!err)
1104                                 isr_setup_status_phase(ci);
1105                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1106                         if (req.wLength != 0)
1107                                 break;
1108                         switch (le16_to_cpu(req.wValue)) {
1109                         case USB_DEVICE_REMOTE_WAKEUP:
1110                                 ci->remote_wakeup = 1;
1111                                 err = isr_setup_status_phase(ci);
1112                                 break;
1113                         case USB_DEVICE_TEST_MODE:
1114                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1115                                 switch (tmode) {
1116                                 case TEST_J:
1117                                 case TEST_K:
1118                                 case TEST_SE0_NAK:
1119                                 case TEST_PACKET:
1120                                 case TEST_FORCE_EN:
1121                                         ci->test_mode = tmode;
1122                                         err = isr_setup_status_phase(
1123                                                         ci);
1124                                         break;
1125                                 default:
1126                                         break;
1127                                 }
1128                                 break;
1129                         case USB_DEVICE_B_HNP_ENABLE:
1130                                 if (ci_otg_is_fsm_mode(ci)) {
1131                                         ci->gadget.b_hnp_enable = 1;
1132                                         err = isr_setup_status_phase(
1133                                                         ci);
1134                                 }
1135                                 break;
1136                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1137                                 if (ci_otg_is_fsm_mode(ci))
1138                                         err = otg_a_alt_hnp_support(ci);
1139                                 break;
1140                         case USB_DEVICE_A_HNP_SUPPORT:
1141                                 if (ci_otg_is_fsm_mode(ci)) {
1142                                         ci->gadget.a_hnp_support = 1;
1143                                         err = isr_setup_status_phase(
1144                                                         ci);
1145                                 }
1146                                 break;
1147                         default:
1148                                 goto delegate;
1149                         }
1150                 } else {
1151                         goto delegate;
1152                 }
1153                 break;
1154         default:
1155 delegate:
1156                 if (req.wLength == 0)   /* no data phase */
1157                         ci->ep0_dir = TX;
1158
1159                 spin_unlock(&ci->lock);
1160                 err = ci->driver->setup(&ci->gadget, &req);
1161                 spin_lock(&ci->lock);
1162                 break;
1163         }
1164
1165         if (err < 0) {
1166                 spin_unlock(&ci->lock);
1167                 if (_ep_set_halt(&hwep->ep, 1, false))
1168                         dev_err(ci->dev, "error: _ep_set_halt\n");
1169                 spin_lock(&ci->lock);
1170         }
1171 }
1172
1173 /**
1174  * isr_tr_complete_handler: transaction complete interrupt handler
1175  * @ci: UDC descriptor
1176  *
1177  * This function handles traffic events
1178  */
1179 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1180 __releases(ci->lock)
1181 __acquires(ci->lock)
1182 {
1183         unsigned i;
1184         int err;
1185
1186         for (i = 0; i < ci->hw_ep_max; i++) {
1187                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1188
1189                 if (hwep->ep.desc == NULL)
1190                         continue;   /* not configured */
1191
1192                 if (hw_test_and_clear_complete(ci, i)) {
1193                         err = isr_tr_complete_low(hwep);
1194                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1195                                 if (err > 0)   /* needs status phase */
1196                                         err = isr_setup_status_phase(ci);
1197                                 if (err < 0) {
1198                                         spin_unlock(&ci->lock);
1199                                         if (_ep_set_halt(&hwep->ep, 1, false))
1200                                                 dev_err(ci->dev,
1201                                                 "error: _ep_set_halt\n");
1202                                         spin_lock(&ci->lock);
1203                                 }
1204                         }
1205                 }
1206
1207                 /* Only handle setup packet below */
1208                 if (i == 0 &&
1209                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1210                         isr_setup_packet_handler(ci);
1211         }
1212 }
1213
1214 /******************************************************************************
1215  * ENDPT block
1216  *****************************************************************************/
1217 /**
1218  * ep_enable: configure endpoint, making it usable
1219  *
1220  * Check usb_ep_enable() at "usb_gadget.h" for details
1221  */
1222 static int ep_enable(struct usb_ep *ep,
1223                      const struct usb_endpoint_descriptor *desc)
1224 {
1225         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1226         int retval = 0;
1227         unsigned long flags;
1228         u32 cap = 0;
1229
1230         if (ep == NULL || desc == NULL)
1231                 return -EINVAL;
1232
1233         spin_lock_irqsave(hwep->lock, flags);
1234
1235         /* only internal SW should enable ctrl endpts */
1236
1237         if (!list_empty(&hwep->qh.queue)) {
1238                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1239                 spin_unlock_irqrestore(hwep->lock, flags);
1240                 return -EBUSY;
1241         }
1242
1243         hwep->ep.desc = desc;
1244
1245         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1246         hwep->num  = usb_endpoint_num(desc);
1247         hwep->type = usb_endpoint_type(desc);
1248
1249         hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1250         hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1251
1252         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1253                 cap |= QH_IOS;
1254
1255         cap |= QH_ZLT;
1256         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1257         /*
1258          * For ISO-TX, we set mult at QH as the largest value, and use
1259          * MultO at TD as real mult value.
1260          */
1261         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1262                 cap |= 3 << __ffs(QH_MULT);
1263
1264         hwep->qh.ptr->cap = cpu_to_le32(cap);
1265
1266         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1267
1268         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1269                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1270                 retval = -EINVAL;
1271         }
1272
1273         /*
1274          * Enable endpoints in the HW other than ep0 as ep0
1275          * is always enabled
1276          */
1277         if (hwep->num)
1278                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1279                                        hwep->type);
1280
1281         spin_unlock_irqrestore(hwep->lock, flags);
1282         return retval;
1283 }
1284
1285 /**
1286  * ep_disable: endpoint is no longer usable
1287  *
1288  * Check usb_ep_disable() at "usb_gadget.h" for details
1289  */
1290 static int ep_disable(struct usb_ep *ep)
1291 {
1292         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1293         int direction, retval = 0;
1294         unsigned long flags;
1295
1296         if (ep == NULL)
1297                 return -EINVAL;
1298         else if (hwep->ep.desc == NULL)
1299                 return -EBUSY;
1300
1301         spin_lock_irqsave(hwep->lock, flags);
1302
1303         /* only internal SW should disable ctrl endpts */
1304
1305         direction = hwep->dir;
1306         do {
1307                 retval |= _ep_nuke(hwep);
1308                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1309
1310                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1311                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1312
1313         } while (hwep->dir != direction);
1314
1315         hwep->ep.desc = NULL;
1316
1317         spin_unlock_irqrestore(hwep->lock, flags);
1318         return retval;
1319 }
1320
1321 /**
1322  * ep_alloc_request: allocate a request object to use with this endpoint
1323  *
1324  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1325  */
1326 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1327 {
1328         struct ci_hw_req *hwreq = NULL;
1329
1330         if (ep == NULL)
1331                 return NULL;
1332
1333         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1334         if (hwreq != NULL) {
1335                 INIT_LIST_HEAD(&hwreq->queue);
1336                 INIT_LIST_HEAD(&hwreq->tds);
1337         }
1338
1339         return (hwreq == NULL) ? NULL : &hwreq->req;
1340 }
1341
1342 /**
1343  * ep_free_request: frees a request object
1344  *
1345  * Check usb_ep_free_request() at "usb_gadget.h" for details
1346  */
1347 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1348 {
1349         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1350         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1351         struct td_node *node, *tmpnode;
1352         unsigned long flags;
1353
1354         if (ep == NULL || req == NULL) {
1355                 return;
1356         } else if (!list_empty(&hwreq->queue)) {
1357                 dev_err(hwep->ci->dev, "freeing queued request\n");
1358                 return;
1359         }
1360
1361         spin_lock_irqsave(hwep->lock, flags);
1362
1363         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1364                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1365                 list_del_init(&node->td);
1366                 node->ptr = NULL;
1367                 kfree(node);
1368         }
1369
1370         kfree(hwreq);
1371
1372         spin_unlock_irqrestore(hwep->lock, flags);
1373 }
1374
1375 /**
1376  * ep_queue: queues (submits) an I/O request to an endpoint
1377  *
1378  * Check usb_ep_queue()* at usb_gadget.h" for details
1379  */
1380 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1381                     gfp_t __maybe_unused gfp_flags)
1382 {
1383         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1384         int retval = 0;
1385         unsigned long flags;
1386
1387         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1388                 return -EINVAL;
1389
1390         spin_lock_irqsave(hwep->lock, flags);
1391         retval = _ep_queue(ep, req, gfp_flags);
1392         spin_unlock_irqrestore(hwep->lock, flags);
1393         return retval;
1394 }
1395
1396 /**
1397  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1398  *
1399  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1400  */
1401 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1402 {
1403         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1404         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1405         unsigned long flags;
1406         struct td_node *node, *tmpnode;
1407
1408         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1409                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1410                 list_empty(&hwep->qh.queue))
1411                 return -EINVAL;
1412
1413         spin_lock_irqsave(hwep->lock, flags);
1414
1415         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1416
1417         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1418                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1419                 list_del(&node->td);
1420                 kfree(node);
1421         }
1422
1423         /* pop request */
1424         list_del_init(&hwreq->queue);
1425
1426         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1427
1428         req->status = -ECONNRESET;
1429
1430         if (hwreq->req.complete != NULL) {
1431                 spin_unlock(hwep->lock);
1432                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1433                 spin_lock(hwep->lock);
1434         }
1435
1436         spin_unlock_irqrestore(hwep->lock, flags);
1437         return 0;
1438 }
1439
1440 /**
1441  * ep_set_halt: sets the endpoint halt feature
1442  *
1443  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1444  */
1445 static int ep_set_halt(struct usb_ep *ep, int value)
1446 {
1447         return _ep_set_halt(ep, value, true);
1448 }
1449
1450 /**
1451  * ep_set_wedge: sets the halt feature and ignores clear requests
1452  *
1453  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1454  */
1455 static int ep_set_wedge(struct usb_ep *ep)
1456 {
1457         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1458         unsigned long flags;
1459
1460         if (ep == NULL || hwep->ep.desc == NULL)
1461                 return -EINVAL;
1462
1463         spin_lock_irqsave(hwep->lock, flags);
1464         hwep->wedge = 1;
1465         spin_unlock_irqrestore(hwep->lock, flags);
1466
1467         return usb_ep_set_halt(ep);
1468 }
1469
1470 /**
1471  * ep_fifo_flush: flushes contents of a fifo
1472  *
1473  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1474  */
1475 static void ep_fifo_flush(struct usb_ep *ep)
1476 {
1477         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1478         unsigned long flags;
1479
1480         if (ep == NULL) {
1481                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1482                 return;
1483         }
1484
1485         spin_lock_irqsave(hwep->lock, flags);
1486
1487         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1488
1489         spin_unlock_irqrestore(hwep->lock, flags);
1490 }
1491
1492 /**
1493  * Endpoint-specific part of the API to the USB controller hardware
1494  * Check "usb_gadget.h" for details
1495  */
1496 static const struct usb_ep_ops usb_ep_ops = {
1497         .enable        = ep_enable,
1498         .disable       = ep_disable,
1499         .alloc_request = ep_alloc_request,
1500         .free_request  = ep_free_request,
1501         .queue         = ep_queue,
1502         .dequeue       = ep_dequeue,
1503         .set_halt      = ep_set_halt,
1504         .set_wedge     = ep_set_wedge,
1505         .fifo_flush    = ep_fifo_flush,
1506 };
1507
1508 /******************************************************************************
1509  * GADGET block
1510  *****************************************************************************/
1511 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1512 {
1513         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1514         unsigned long flags;
1515         int gadget_ready = 0;
1516
1517         spin_lock_irqsave(&ci->lock, flags);
1518         ci->vbus_active = is_active;
1519         if (ci->driver)
1520                 gadget_ready = 1;
1521         spin_unlock_irqrestore(&ci->lock, flags);
1522
1523         if (gadget_ready) {
1524                 if (is_active) {
1525                         pm_runtime_get_sync(&_gadget->dev);
1526                         hw_device_reset(ci);
1527                         hw_device_state(ci, ci->ep0out->qh.dma);
1528                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1529                         usb_udc_vbus_handler(_gadget, true);
1530                 } else {
1531                         usb_udc_vbus_handler(_gadget, false);
1532                         if (ci->driver)
1533                                 ci->driver->disconnect(&ci->gadget);
1534                         hw_device_state(ci, 0);
1535                         if (ci->platdata->notify_event)
1536                                 ci->platdata->notify_event(ci,
1537                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1538                         _gadget_stop_activity(&ci->gadget);
1539                         pm_runtime_put_sync(&_gadget->dev);
1540                         usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1541                 }
1542         }
1543
1544         return 0;
1545 }
1546
1547 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1548 {
1549         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1550         unsigned long flags;
1551         int ret = 0;
1552
1553         spin_lock_irqsave(&ci->lock, flags);
1554         if (!ci->remote_wakeup) {
1555                 ret = -EOPNOTSUPP;
1556                 goto out;
1557         }
1558         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1559                 ret = -EINVAL;
1560                 goto out;
1561         }
1562         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1563 out:
1564         spin_unlock_irqrestore(&ci->lock, flags);
1565         return ret;
1566 }
1567
1568 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1569 {
1570         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1571
1572         if (ci->usb_phy)
1573                 return usb_phy_set_power(ci->usb_phy, ma);
1574         return -ENOTSUPP;
1575 }
1576
1577 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1578 {
1579         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1580         struct ci_hw_ep *hwep = ci->ep0in;
1581         unsigned long flags;
1582
1583         spin_lock_irqsave(hwep->lock, flags);
1584         _gadget->is_selfpowered = (is_on != 0);
1585         spin_unlock_irqrestore(hwep->lock, flags);
1586
1587         return 0;
1588 }
1589
1590 /* Change Data+ pullup status
1591  * this func is used by usb_gadget_connect/disconnet
1592  */
1593 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1594 {
1595         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1596
1597         /*
1598          * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1599          * and don't touch Data+ in host mode for dual role config.
1600          */
1601         if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1602                 return 0;
1603
1604         pm_runtime_get_sync(&ci->gadget.dev);
1605         if (is_on)
1606                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1607         else
1608                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1609         pm_runtime_put_sync(&ci->gadget.dev);
1610
1611         return 0;
1612 }
1613
1614 static int ci_udc_start(struct usb_gadget *gadget,
1615                          struct usb_gadget_driver *driver);
1616 static int ci_udc_stop(struct usb_gadget *gadget);
1617 /**
1618  * Device operations part of the API to the USB controller hardware,
1619  * which don't involve endpoints (or i/o)
1620  * Check  "usb_gadget.h" for details
1621  */
1622 static const struct usb_gadget_ops usb_gadget_ops = {
1623         .vbus_session   = ci_udc_vbus_session,
1624         .wakeup         = ci_udc_wakeup,
1625         .set_selfpowered        = ci_udc_selfpowered,
1626         .pullup         = ci_udc_pullup,
1627         .vbus_draw      = ci_udc_vbus_draw,
1628         .udc_start      = ci_udc_start,
1629         .udc_stop       = ci_udc_stop,
1630 };
1631
1632 static int init_eps(struct ci_hdrc *ci)
1633 {
1634         int retval = 0, i, j;
1635
1636         for (i = 0; i < ci->hw_ep_max/2; i++)
1637                 for (j = RX; j <= TX; j++) {
1638                         int k = i + j * ci->hw_ep_max/2;
1639                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1640
1641                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1642                                         (j == TX)  ? "in" : "out");
1643
1644                         hwep->ci          = ci;
1645                         hwep->lock         = &ci->lock;
1646                         hwep->td_pool      = ci->td_pool;
1647
1648                         hwep->ep.name      = hwep->name;
1649                         hwep->ep.ops       = &usb_ep_ops;
1650
1651                         if (i == 0) {
1652                                 hwep->ep.caps.type_control = true;
1653                         } else {
1654                                 hwep->ep.caps.type_iso = true;
1655                                 hwep->ep.caps.type_bulk = true;
1656                                 hwep->ep.caps.type_int = true;
1657                         }
1658
1659                         if (j == TX)
1660                                 hwep->ep.caps.dir_in = true;
1661                         else
1662                                 hwep->ep.caps.dir_out = true;
1663
1664                         /*
1665                          * for ep0: maxP defined in desc, for other
1666                          * eps, maxP is set by epautoconfig() called
1667                          * by gadget layer
1668                          */
1669                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1670
1671                         INIT_LIST_HEAD(&hwep->qh.queue);
1672                         hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1673                                                      &hwep->qh.dma);
1674                         if (hwep->qh.ptr == NULL)
1675                                 retval = -ENOMEM;
1676                         else
1677                                 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1678
1679                         /*
1680                          * set up shorthands for ep0 out and in endpoints,
1681                          * don't add to gadget's ep_list
1682                          */
1683                         if (i == 0) {
1684                                 if (j == RX)
1685                                         ci->ep0out = hwep;
1686                                 else
1687                                         ci->ep0in = hwep;
1688
1689                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1690                                 continue;
1691                         }
1692
1693                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1694                 }
1695
1696         return retval;
1697 }
1698
1699 static void destroy_eps(struct ci_hdrc *ci)
1700 {
1701         int i;
1702
1703         for (i = 0; i < ci->hw_ep_max; i++) {
1704                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1705
1706                 if (hwep->pending_td)
1707                         free_pending_td(hwep);
1708                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1709         }
1710 }
1711
1712 /**
1713  * ci_udc_start: register a gadget driver
1714  * @gadget: our gadget
1715  * @driver: the driver being registered
1716  *
1717  * Interrupts are enabled here.
1718  */
1719 static int ci_udc_start(struct usb_gadget *gadget,
1720                          struct usb_gadget_driver *driver)
1721 {
1722         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1723         unsigned long flags;
1724         int retval = -ENOMEM;
1725
1726         if (driver->disconnect == NULL)
1727                 return -EINVAL;
1728
1729
1730         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1731         retval = usb_ep_enable(&ci->ep0out->ep);
1732         if (retval)
1733                 return retval;
1734
1735         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1736         retval = usb_ep_enable(&ci->ep0in->ep);
1737         if (retval)
1738                 return retval;
1739
1740         ci->driver = driver;
1741
1742         /* Start otg fsm for B-device */
1743         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1744                 ci_hdrc_otg_fsm_start(ci);
1745                 return retval;
1746         }
1747
1748         pm_runtime_get_sync(&ci->gadget.dev);
1749         if (ci->vbus_active) {
1750                 spin_lock_irqsave(&ci->lock, flags);
1751                 hw_device_reset(ci);
1752         } else {
1753                 usb_udc_vbus_handler(&ci->gadget, false);
1754                 pm_runtime_put_sync(&ci->gadget.dev);
1755                 return retval;
1756         }
1757
1758         retval = hw_device_state(ci, ci->ep0out->qh.dma);
1759         spin_unlock_irqrestore(&ci->lock, flags);
1760         if (retval)
1761                 pm_runtime_put_sync(&ci->gadget.dev);
1762
1763         return retval;
1764 }
1765
1766 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1767 {
1768         if (!ci_otg_is_fsm_mode(ci))
1769                 return;
1770
1771         mutex_lock(&ci->fsm.lock);
1772         if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1773                 ci->fsm.a_bidl_adis_tmout = 1;
1774                 ci_hdrc_otg_fsm_start(ci);
1775         } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1776                 ci->fsm.protocol = PROTO_UNDEF;
1777                 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1778         }
1779         mutex_unlock(&ci->fsm.lock);
1780 }
1781
1782 /**
1783  * ci_udc_stop: unregister a gadget driver
1784  */
1785 static int ci_udc_stop(struct usb_gadget *gadget)
1786 {
1787         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1788         unsigned long flags;
1789
1790         spin_lock_irqsave(&ci->lock, flags);
1791
1792         if (ci->vbus_active) {
1793                 hw_device_state(ci, 0);
1794                 if (ci->platdata->notify_event)
1795                         ci->platdata->notify_event(ci,
1796                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1797                 spin_unlock_irqrestore(&ci->lock, flags);
1798                 _gadget_stop_activity(&ci->gadget);
1799                 spin_lock_irqsave(&ci->lock, flags);
1800                 pm_runtime_put(&ci->gadget.dev);
1801         }
1802
1803         ci->driver = NULL;
1804         spin_unlock_irqrestore(&ci->lock, flags);
1805
1806         ci_udc_stop_for_otg_fsm(ci);
1807         return 0;
1808 }
1809
1810 /******************************************************************************
1811  * BUS block
1812  *****************************************************************************/
1813 /**
1814  * udc_irq: ci interrupt handler
1815  *
1816  * This function returns IRQ_HANDLED if the IRQ has been handled
1817  * It locks access to registers
1818  */
1819 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1820 {
1821         irqreturn_t retval;
1822         u32 intr;
1823
1824         if (ci == NULL)
1825                 return IRQ_HANDLED;
1826
1827         spin_lock(&ci->lock);
1828
1829         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1830                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1831                                 USBMODE_CM_DC) {
1832                         spin_unlock(&ci->lock);
1833                         return IRQ_NONE;
1834                 }
1835         }
1836         intr = hw_test_and_clear_intr_active(ci);
1837
1838         if (intr) {
1839                 /* order defines priority - do NOT change it */
1840                 if (USBi_URI & intr)
1841                         isr_reset_handler(ci);
1842
1843                 if (USBi_PCI & intr) {
1844                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
1845                                 USB_SPEED_HIGH : USB_SPEED_FULL;
1846                         if (ci->suspended && ci->driver->resume) {
1847                                 spin_unlock(&ci->lock);
1848                                 ci->driver->resume(&ci->gadget);
1849                                 spin_lock(&ci->lock);
1850                                 ci->suspended = 0;
1851                         }
1852                 }
1853
1854                 if (USBi_UI  & intr)
1855                         isr_tr_complete_handler(ci);
1856
1857                 if (USBi_SLI & intr) {
1858                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1859                             ci->driver->suspend) {
1860                                 ci->suspended = 1;
1861                                 spin_unlock(&ci->lock);
1862                                 ci->driver->suspend(&ci->gadget);
1863                                 usb_gadget_set_state(&ci->gadget,
1864                                                 USB_STATE_SUSPENDED);
1865                                 spin_lock(&ci->lock);
1866                         }
1867                 }
1868                 retval = IRQ_HANDLED;
1869         } else {
1870                 retval = IRQ_NONE;
1871         }
1872         spin_unlock(&ci->lock);
1873
1874         return retval;
1875 }
1876
1877 /**
1878  * udc_start: initialize gadget role
1879  * @ci: chipidea controller
1880  */
1881 static int udc_start(struct ci_hdrc *ci)
1882 {
1883         struct device *dev = ci->dev;
1884         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1885         int retval = 0;
1886
1887         ci->gadget.ops          = &usb_gadget_ops;
1888         ci->gadget.speed        = USB_SPEED_UNKNOWN;
1889         ci->gadget.max_speed    = USB_SPEED_HIGH;
1890         ci->gadget.name         = ci->platdata->name;
1891         ci->gadget.otg_caps     = otg_caps;
1892
1893         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1894                                                 otg_caps->adp_support))
1895                 ci->gadget.is_otg = 1;
1896
1897         INIT_LIST_HEAD(&ci->gadget.ep_list);
1898
1899         /* alloc resources */
1900         ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1901                                        sizeof(struct ci_hw_qh),
1902                                        64, CI_HDRC_PAGE_SIZE);
1903         if (ci->qh_pool == NULL)
1904                 return -ENOMEM;
1905
1906         ci->td_pool = dma_pool_create("ci_hw_td", dev,
1907                                        sizeof(struct ci_hw_td),
1908                                        64, CI_HDRC_PAGE_SIZE);
1909         if (ci->td_pool == NULL) {
1910                 retval = -ENOMEM;
1911                 goto free_qh_pool;
1912         }
1913
1914         retval = init_eps(ci);
1915         if (retval)
1916                 goto free_pools;
1917
1918         ci->gadget.ep0 = &ci->ep0in->ep;
1919
1920         retval = usb_add_gadget_udc(dev, &ci->gadget);
1921         if (retval)
1922                 goto destroy_eps;
1923
1924         pm_runtime_no_callbacks(&ci->gadget.dev);
1925         pm_runtime_enable(&ci->gadget.dev);
1926
1927         return retval;
1928
1929 destroy_eps:
1930         destroy_eps(ci);
1931 free_pools:
1932         dma_pool_destroy(ci->td_pool);
1933 free_qh_pool:
1934         dma_pool_destroy(ci->qh_pool);
1935         return retval;
1936 }
1937
1938 /**
1939  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1940  *
1941  * No interrupts active, the IRQ has been released
1942  */
1943 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1944 {
1945         if (!ci->roles[CI_ROLE_GADGET])
1946                 return;
1947
1948         usb_del_gadget_udc(&ci->gadget);
1949
1950         destroy_eps(ci);
1951
1952         dma_pool_destroy(ci->td_pool);
1953         dma_pool_destroy(ci->qh_pool);
1954 }
1955
1956 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1957 {
1958         if (ci->is_otg)
1959                 /* Clear and enable BSV irq */
1960                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1961                                         OTGSC_BSVIS | OTGSC_BSVIE);
1962
1963         return 0;
1964 }
1965
1966 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1967 {
1968         /*
1969          * host doesn't care B_SESSION_VALID event
1970          * so clear and disbale BSV irq
1971          */
1972         if (ci->is_otg)
1973                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1974 }
1975
1976 /**
1977  * ci_hdrc_gadget_init - initialize device related bits
1978  * ci: the controller
1979  *
1980  * This function initializes the gadget, if the device is "device capable".
1981  */
1982 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1983 {
1984         struct ci_role_driver *rdrv;
1985
1986         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
1987                 return -ENXIO;
1988
1989         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
1990         if (!rdrv)
1991                 return -ENOMEM;
1992
1993         rdrv->start     = udc_id_switch_for_device;
1994         rdrv->stop      = udc_id_switch_for_host;
1995         rdrv->irq       = udc_irq;
1996         rdrv->name      = "gadget";
1997         ci->roles[CI_ROLE_GADGET] = rdrv;
1998
1999         return udc_start(ci);
2000 }