drivers/usb/chipidea/udc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * udc.c - ChipIdea UDC driver
   4  *
   5  * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
   6  *
   7  * Author: David Lopo
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/device.h>
  16 #include <linux/dmapool.h>
  17 #include <linux/err.h>
  18 #include <linux/irqreturn.h>
  19 #include <linux/kernel.h>
  20 #include <linux/slab.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/usb/ch9.h>
  23 #include <linux/usb/gadget.h>
  24 #include <linux/usb/otg-fsm.h>
  25 #include <linux/usb/chipidea.h>
  26
  27 #include "ci.h"
  28 #include "udc.h"
  29 #include "bits.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 == TX) ? 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_write(ci, OP_ENDPTCTRL + num,
 126                  (dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 127         return 0;
 128 }
 129
 130 /**
 131  * hw_ep_enable: enables endpoint (execute without interruption)
 132  * @num:  endpoint number
 133  * @dir:  endpoint direction
 134  * @type: endpoint type
 135  *
 136  * This function returns an error code
 137  */
 138 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
 139 {
 140         u32 mask, data;
 141
 142         if (dir == TX) {
 143                 mask  = ENDPTCTRL_TXT;  /* type    */
 144                 data  = type << __ffs(mask);
 145
 146                 mask |= ENDPTCTRL_TXS;  /* unstall */
 147                 mask |= ENDPTCTRL_TXR;  /* reset data toggle */
 148                 data |= ENDPTCTRL_TXR;
 149                 mask |= ENDPTCTRL_TXE;  /* enable  */
 150                 data |= ENDPTCTRL_TXE;
 151         } else {
 152                 mask  = ENDPTCTRL_RXT;  /* type    */
 153                 data  = type << __ffs(mask);
 154
 155                 mask |= ENDPTCTRL_RXS;  /* unstall */
 156                 mask |= ENDPTCTRL_RXR;  /* reset data toggle */
 157                 data |= ENDPTCTRL_RXR;
 158                 mask |= ENDPTCTRL_RXE;  /* enable  */
 159                 data |= ENDPTCTRL_RXE;
 160         }
 161         hw_write(ci, OP_ENDPTCTRL + num, mask, data);
 162         return 0;
 163 }
 164
 165 /**
 166  * hw_ep_get_halt: return endpoint halt status
 167  * @num: endpoint number
 168  * @dir: endpoint direction
 169  *
 170  * This function returns 1 if endpoint halted
 171  */
 172 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
 173 {
 174         u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 175
 176         return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
 177 }
 178
 179 /**
 180  * hw_ep_prime: primes endpoint (execute without interruption)
 181  * @num:     endpoint number
 182  * @dir:     endpoint direction
 183  * @is_ctrl: true if control endpoint
 184  *
 185  * This function returns an error code
 186  */
 187 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
 188 {
 189         int n = hw_ep_bit(num, dir);
 190
 191         /* Synchronize before ep prime */
 192         wmb();
 193
 194         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 195                 return -EAGAIN;
 196
 197         hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
 198
 199         while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 200                 cpu_relax();
 201         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 202                 return -EAGAIN;
 203
 204         /* status shoult be tested according with manual but it doesn't work */
 205         return 0;
 206 }
 207
 208 /**
 209  * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
 210  *                 without interruption)
 211  * @num:   endpoint number
 212  * @dir:   endpoint direction
 213  * @value: true => stall, false => unstall
 214  *
 215  * This function returns an error code
 216  */
 217 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
 218 {
 219         if (value != 0 && value != 1)
 220                 return -EINVAL;
 221
 222         do {
 223                 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
 224                 u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 225                 u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
 226
 227                 /* data toggle - reserved for EP0 but it's in ESS */
 228                 hw_write(ci, reg, mask_xs|mask_xr,
 229                           value ? mask_xs : mask_xr);
 230         } while (value != hw_ep_get_halt(ci, num, dir));
 231
 232         return 0;
 233 }
 234
 235 /**
 236  * hw_is_port_high_speed: test if port is high speed
 237  *
 238  * This function returns true if high speed port
 239  */
 240 static int hw_port_is_high_speed(struct ci_hdrc *ci)
 241 {
 242         return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
 243                 hw_read(ci, OP_PORTSC, PORTSC_HSP);
 244 }
 245
 246 /**
 247  * hw_test_and_clear_complete: test & clear complete status (execute without
 248  *                             interruption)
 249  * @n: endpoint number
 250  *
 251  * This function returns complete status
 252  */
 253 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
 254 {
 255         n = ep_to_bit(ci, n);
 256         return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
 257 }
 258
 259 /**
 260  * hw_test_and_clear_intr_active: test & clear active interrupts (execute
 261  *                                without interruption)
 262  *
 263  * This function returns active interrutps
 264  */
 265 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
 266 {
 267         u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
 268
 269         hw_write(ci, OP_USBSTS, ~0, reg);
 270         return reg;
 271 }
 272
 273 /**
 274  * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
 275  *                                interruption)
 276  *
 277  * This function returns guard value
 278  */
 279 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
 280 {
 281         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
 282 }
 283
 284 /**
 285  * hw_test_and_set_setup_guard: test & set setup guard (execute without
 286  *                              interruption)
 287  *
 288  * This function returns guard value
 289  */
 290 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
 291 {
 292         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
 293 }
 294
 295 /**
 296  * hw_usb_set_address: configures USB address (execute without interruption)
 297  * @value: new USB address
 298  *
 299  * This function explicitly sets the address, without the "USBADRA" (advance)
 300  * feature, which is not supported by older versions of the controller.
 301  */
 302 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
 303 {
 304         hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
 305                  value << __ffs(DEVICEADDR_USBADR));
 306 }
 307
 308 /**
 309  * hw_usb_reset: restart device after a bus reset (execute without
 310  *               interruption)
 311  *
 312  * This function returns an error code
 313  */
 314 static int hw_usb_reset(struct ci_hdrc *ci)
 315 {
 316         hw_usb_set_address(ci, 0);
 317
 318         /* ESS flushes only at end?!? */
 319         hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
 320
 321         /* clear setup token semaphores */
 322         hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
 323
 324         /* clear complete status */
 325         hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
 326
 327         /* wait until all bits cleared */
 328         while (hw_read(ci, OP_ENDPTPRIME, ~0))
 329                 udelay(10);             /* not RTOS friendly */
 330
 331         /* reset all endpoints ? */
 332
 333         /* reset internal status and wait for further instructions
 334            no need to verify the port reset status (ESS does it) */
 335
 336         return 0;
 337 }
 338
 339 /******************************************************************************
 340  * UTIL block
 341  *****************************************************************************/
 342
 343 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 344                           unsigned length)
 345 {
 346         int i;
 347         u32 temp;
 348         struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
 349                                                   GFP_ATOMIC);
 350
 351         if (node == NULL)
 352                 return -ENOMEM;
 353
 354         node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma);
 355         if (node->ptr == NULL) {
 356                 kfree(node);
 357                 return -ENOMEM;
 358         }
 359
 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 |= cpu_to_le32(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_enqueue: configures a request at hardware level
 408  * @hwep:   endpoint
 409  * @hwreq:  request
 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_by_dev(ci->dev->parent,
 428                                             &hwreq->req, hwep->dir);
 429         if (ret)
 430                 return ret;
 431
 432         /*
 433          * The first buffer could be not page aligned.
 434          * In that case we have to span into one extra td.
 435          */
 436         if (hwreq->req.dma % PAGE_SIZE)
 437                 pages--;
 438
 439         if (rest == 0) {
 440                 ret = add_td_to_list(hwep, hwreq, 0);
 441                 if (ret < 0)
 442                         goto done;
 443         }
 444
 445         while (rest > 0) {
 446                 unsigned count = min(hwreq->req.length - hwreq->req.actual,
 447                                         (unsigned)(pages * CI_HDRC_PAGE_SIZE));
 448                 ret = add_td_to_list(hwep, hwreq, count);
 449                 if (ret < 0)
 450                         goto done;
 451
 452                 rest -= count;
 453         }
 454
 455         if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
 456             && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
 457                 ret = add_td_to_list(hwep, hwreq, 0);
 458                 if (ret < 0)
 459                         goto done;
 460         }
 461
 462         firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 463
 464         lastnode = list_entry(hwreq->tds.prev,
 465                 struct td_node, td);
 466
 467         lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
 468         if (!hwreq->req.no_interrupt)
 469                 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
 470         wmb();
 471
 472         hwreq->req.actual = 0;
 473         if (!list_empty(&hwep->qh.queue)) {
 474                 struct ci_hw_req *hwreqprev;
 475                 int n = hw_ep_bit(hwep->num, hwep->dir);
 476                 int tmp_stat;
 477                 struct td_node *prevlastnode;
 478                 u32 next = firstnode->dma & TD_ADDR_MASK;
 479
 480                 hwreqprev = list_entry(hwep->qh.queue.prev,
 481                                 struct ci_hw_req, queue);
 482                 prevlastnode = list_entry(hwreqprev->tds.prev,
 483                                 struct td_node, td);
 484
 485                 prevlastnode->ptr->next = cpu_to_le32(next);
 486                 wmb();
 487                 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 488                         goto done;
 489                 do {
 490                         hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
 491                         tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
 492                 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
 493                 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
 494                 if (tmp_stat)
 495                         goto done;
 496         }
 497
 498         /*  QH configuration */
 499         hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
 500         hwep->qh.ptr->td.token &=
 501                 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
 502
 503         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
 504                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 505
 506                 if (hwreq->req.length == 0
 507                                 || hwreq->req.length % hwep->ep.maxpacket)
 508                         mul++;
 509                 hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT));
 510         }
 511
 512         ret = hw_ep_prime(ci, hwep->num, hwep->dir,
 513                            hwep->type == USB_ENDPOINT_XFER_CONTROL);
 514 done:
 515         return ret;
 516 }
 517
 518 /*
 519  * free_pending_td: remove a pending request for the endpoint
 520  * @hwep: endpoint
 521  */
 522 static void free_pending_td(struct ci_hw_ep *hwep)
 523 {
 524         struct td_node *pending = hwep->pending_td;
 525
 526         dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
 527         hwep->pending_td = NULL;
 528         kfree(pending);
 529 }
 530
 531 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
 532                                            struct td_node *node)
 533 {
 534         hwep->qh.ptr->td.next = cpu_to_le32(node->dma);
 535         hwep->qh.ptr->td.token &=
 536                 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
 537
 538         return hw_ep_prime(ci, hwep->num, hwep->dir,
 539                                 hwep->type == USB_ENDPOINT_XFER_CONTROL);
 540 }
 541
 542 /**
 543  * _hardware_dequeue: handles a request at hardware level
 544  * @gadget: gadget
 545  * @hwep:   endpoint
 546  *
 547  * This function returns an error code
 548  */
 549 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 550 {
 551         u32 tmptoken;
 552         struct td_node *node, *tmpnode;
 553         unsigned remaining_length;
 554         unsigned actual = hwreq->req.length;
 555         struct ci_hdrc *ci = hwep->ci;
 556
 557         if (hwreq->req.status != -EALREADY)
 558                 return -EINVAL;
 559
 560         hwreq->req.status = 0;
 561
 562         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 563                 tmptoken = le32_to_cpu(node->ptr->token);
 564                 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
 565                         int n = hw_ep_bit(hwep->num, hwep->dir);
 566
 567                         if (ci->rev == CI_REVISION_24)
 568                                 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 569                                         reprime_dtd(ci, hwep, node);
 570                         hwreq->req.status = -EALREADY;
 571                         return -EBUSY;
 572                 }
 573
 574                 remaining_length = (tmptoken & TD_TOTAL_BYTES);
 575                 remaining_length >>= __ffs(TD_TOTAL_BYTES);
 576                 actual -= remaining_length;
 577
 578                 hwreq->req.status = tmptoken & TD_STATUS;
 579                 if ((TD_STATUS_HALTED & hwreq->req.status)) {
 580                         hwreq->req.status = -EPIPE;
 581                         break;
 582                 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
 583                         hwreq->req.status = -EPROTO;
 584                         break;
 585                 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
 586                         hwreq->req.status = -EILSEQ;
 587                         break;
 588                 }
 589
 590                 if (remaining_length) {
 591                         if (hwep->dir == TX) {
 592                                 hwreq->req.status = -EPROTO;
 593                                 break;
 594                         }
 595                 }
 596                 /*
 597                  * As the hardware could still address the freed td
 598                  * which will run the udc unusable, the cleanup of the
 599                  * td has to be delayed by one.
 600                  */
 601                 if (hwep->pending_td)
 602                         free_pending_td(hwep);
 603
 604                 hwep->pending_td = node;
 605                 list_del_init(&node->td);
 606         }
 607
 608         usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
 609                                         &hwreq->req, hwep->dir);
 610
 611         hwreq->req.actual += actual;
 612
 613         if (hwreq->req.status)
 614                 return hwreq->req.status;
 615
 616         return hwreq->req.actual;
 617 }
 618
 619 /**
 620  * _ep_nuke: dequeues all endpoint requests
 621  * @hwep: endpoint
 622  *
 623  * This function returns an error code
 624  * Caller must hold lock
 625  */
 626 static int _ep_nuke(struct ci_hw_ep *hwep)
 627 __releases(hwep->lock)
 628 __acquires(hwep->lock)
 629 {
 630         struct td_node *node, *tmpnode;
 631         if (hwep == NULL)
 632                 return -EINVAL;
 633
 634         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
 635
 636         while (!list_empty(&hwep->qh.queue)) {
 637
 638                 /* pop oldest request */
 639                 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
 640                                                      struct ci_hw_req, queue);
 641
 642                 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 643                         dma_pool_free(hwep->td_pool, node->ptr, node->dma);
 644                         list_del_init(&node->td);
 645                         node->ptr = NULL;
 646                         kfree(node);
 647                 }
 648
 649                 list_del_init(&hwreq->queue);
 650                 hwreq->req.status = -ESHUTDOWN;
 651
 652                 if (hwreq->req.complete != NULL) {
 653                         spin_unlock(hwep->lock);
 654                         usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
 655                         spin_lock(hwep->lock);
 656                 }
 657         }
 658
 659         if (hwep->pending_td)
 660                 free_pending_td(hwep);
 661
 662         return 0;
 663 }
 664
 665 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
 666 {
 667         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
 668         int direction, retval = 0;
 669         unsigned long flags;
 670
 671         if (ep == NULL || hwep->ep.desc == NULL)
 672                 return -EINVAL;
 673
 674         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
 675                 return -EOPNOTSUPP;
 676
 677         spin_lock_irqsave(hwep->lock, flags);
 678
 679         if (value && hwep->dir == TX && check_transfer &&
 680                 !list_empty(&hwep->qh.queue) &&
 681                         !usb_endpoint_xfer_control(hwep->ep.desc)) {
 682                 spin_unlock_irqrestore(hwep->lock, flags);
 683                 return -EAGAIN;
 684         }
 685
 686         direction = hwep->dir;
 687         do {
 688                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
 689
 690                 if (!value)
 691                         hwep->wedge = 0;
 692
 693                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
 694                         hwep->dir = (hwep->dir == TX) ? RX : TX;
 695
 696         } while (hwep->dir != direction);
 697
 698         spin_unlock_irqrestore(hwep->lock, flags);
 699         return retval;
 700 }
 701
 702
 703 /**
 704  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 705  * @gadget: gadget
 706  *
 707  * This function returns an error code
 708  */
 709 static int _gadget_stop_activity(struct usb_gadget *gadget)
 710 {
 711         struct usb_ep *ep;
 712         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 713         unsigned long flags;
 714
 715         spin_lock_irqsave(&ci->lock, flags);
 716         ci->gadget.speed = USB_SPEED_UNKNOWN;
 717         ci->remote_wakeup = 0;
 718         ci->suspended = 0;
 719         spin_unlock_irqrestore(&ci->lock, flags);
 720
 721         /* flush all endpoints */
 722         gadget_for_each_ep(ep, gadget) {
 723                 usb_ep_fifo_flush(ep);
 724         }
 725         usb_ep_fifo_flush(&ci->ep0out->ep);
 726         usb_ep_fifo_flush(&ci->ep0in->ep);
 727
 728         /* make sure to disable all endpoints */
 729         gadget_for_each_ep(ep, gadget) {
 730                 usb_ep_disable(ep);
 731         }
 732
 733         if (ci->status != NULL) {
 734                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 735                 ci->status = NULL;
 736         }
 737
 738         return 0;
 739 }
 740
 741 /******************************************************************************
 742  * ISR block
 743  *****************************************************************************/
 744 /**
 745  * isr_reset_handler: USB reset interrupt handler
 746  * @ci: UDC device
 747  *
 748  * This function resets USB engine after a bus reset occurred
 749  */
 750 static void isr_reset_handler(struct ci_hdrc *ci)
 751 __releases(ci->lock)
 752 __acquires(ci->lock)
 753 {
 754         int retval;
 755
 756         spin_unlock(&ci->lock);
 757         if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 758                 usb_gadget_udc_reset(&ci->gadget, ci->driver);
 759
 760         retval = _gadget_stop_activity(&ci->gadget);
 761         if (retval)
 762                 goto done;
 763
 764         retval = hw_usb_reset(ci);
 765         if (retval)
 766                 goto done;
 767
 768         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 769         if (ci->status == NULL)
 770                 retval = -ENOMEM;
 771
 772 done:
 773         spin_lock(&ci->lock);
 774
 775         if (retval)
 776                 dev_err(ci->dev, "error: %i\n", retval);
 777 }
 778
 779 /**
 780  * isr_get_status_complete: get_status request complete function
 781  * @ep:  endpoint
 782  * @req: request handled
 783  *
 784  * Caller must release lock
 785  */
 786 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 787 {
 788         if (ep == NULL || req == NULL)
 789                 return;
 790
 791         kfree(req->buf);
 792         usb_ep_free_request(ep, req);
 793 }
 794
 795 /**
 796  * _ep_queue: queues (submits) an I/O request to an endpoint
 797  * @ep:        endpoint
 798  * @req:       request
 799  * @gfp_flags: GFP flags (not used)
 800  *
 801  * Caller must hold lock
 802  * This function returns an error code
 803  */
 804 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 805                     gfp_t __maybe_unused gfp_flags)
 806 {
 807         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 808         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 809         struct ci_hdrc *ci = hwep->ci;
 810         int retval = 0;
 811
 812         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 813                 return -EINVAL;
 814
 815         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 816                 if (req->length)
 817                         hwep = (ci->ep0_dir == RX) ?
 818                                ci->ep0out : ci->ep0in;
 819                 if (!list_empty(&hwep->qh.queue)) {
 820                         _ep_nuke(hwep);
 821                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 822                                  _usb_addr(hwep));
 823                 }
 824         }
 825
 826         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 827             hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
 828                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 829                 return -EMSGSIZE;
 830         }
 831
 832         /* first nuke then test link, e.g. previous status has not sent */
 833         if (!list_empty(&hwreq->queue)) {
 834                 dev_err(hwep->ci->dev, "request already in queue\n");
 835                 return -EBUSY;
 836         }
 837
 838         /* push request */
 839         hwreq->req.status = -EINPROGRESS;
 840         hwreq->req.actual = 0;
 841
 842         retval = _hardware_enqueue(hwep, hwreq);
 843
 844         if (retval == -EALREADY)
 845                 retval = 0;
 846         if (!retval)
 847                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
 848
 849         return retval;
 850 }
 851
 852 /**
 853  * isr_get_status_response: get_status request response
 854  * @ci: ci struct
 855  * @setup: setup request packet
 856  *
 857  * This function returns an error code
 858  */
 859 static int isr_get_status_response(struct ci_hdrc *ci,
 860                                    struct usb_ctrlrequest *setup)
 861 __releases(hwep->lock)
 862 __acquires(hwep->lock)
 863 {
 864         struct ci_hw_ep *hwep = ci->ep0in;
 865         struct usb_request *req = NULL;
 866         gfp_t gfp_flags = GFP_ATOMIC;
 867         int dir, num, retval;
 868
 869         if (hwep == NULL || setup == NULL)
 870                 return -EINVAL;
 871
 872         spin_unlock(hwep->lock);
 873         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 874         spin_lock(hwep->lock);
 875         if (req == NULL)
 876                 return -ENOMEM;
 877
 878         req->complete = isr_get_status_complete;
 879         req->length   = 2;
 880         req->buf      = kzalloc(req->length, gfp_flags);
 881         if (req->buf == NULL) {
 882                 retval = -ENOMEM;
 883                 goto err_free_req;
 884         }
 885
 886         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
 887                 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
 888                         ci->gadget.is_selfpowered;
 889         } else if ((setup->bRequestType & USB_RECIP_MASK) \
 890                    == USB_RECIP_ENDPOINT) {
 891                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
 892                         TX : RX;
 893                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 894                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
 895         }
 896         /* else do nothing; reserved for future use */
 897
 898         retval = _ep_queue(&hwep->ep, req, gfp_flags);
 899         if (retval)
 900                 goto err_free_buf;
 901
 902         return 0;
 903
 904  err_free_buf:
 905         kfree(req->buf);
 906  err_free_req:
 907         spin_unlock(hwep->lock);
 908         usb_ep_free_request(&hwep->ep, req);
 909         spin_lock(hwep->lock);
 910         return retval;
 911 }
 912
 913 /**
 914  * isr_setup_status_complete: setup_status request complete function
 915  * @ep:  endpoint
 916  * @req: request handled
 917  *
 918  * Caller must release lock. Put the port in test mode if test mode
 919  * feature is selected.
 920  */
 921 static void
 922 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
 923 {
 924         struct ci_hdrc *ci = req->context;
 925         unsigned long flags;
 926
 927         if (ci->setaddr) {
 928                 hw_usb_set_address(ci, ci->address);
 929                 ci->setaddr = false;
 930                 if (ci->address)
 931                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
 932         }
 933
 934         spin_lock_irqsave(&ci->lock, flags);
 935         if (ci->test_mode)
 936                 hw_port_test_set(ci, ci->test_mode);
 937         spin_unlock_irqrestore(&ci->lock, flags);
 938 }
 939
 940 /**
 941  * isr_setup_status_phase: queues the status phase of a setup transation
 942  * @ci: ci struct
 943  *
 944  * This function returns an error code
 945  */
 946 static int isr_setup_status_phase(struct ci_hdrc *ci)
 947 {
 948         struct ci_hw_ep *hwep;
 949
 950         /*
 951          * Unexpected USB controller behavior, caused by bad signal integrity
 952          * or ground reference problems, can lead to isr_setup_status_phase
 953          * being called with ci->status equal to NULL.
 954          * If this situation occurs, you should review your USB hardware design.
 955          */
 956         if (WARN_ON_ONCE(!ci->status))
 957                 return -EPIPE;
 958
 959         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
 960         ci->status->context = ci;
 961         ci->status->complete = isr_setup_status_complete;
 962
 963         return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
 964 }
 965
 966 /**
 967  * isr_tr_complete_low: transaction complete low level handler
 968  * @hwep: endpoint
 969  *
 970  * This function returns an error code
 971  * Caller must hold lock
 972  */
 973 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
 974 __releases(hwep->lock)
 975 __acquires(hwep->lock)
 976 {
 977         struct ci_hw_req *hwreq, *hwreqtemp;
 978         struct ci_hw_ep *hweptemp = hwep;
 979         int retval = 0;
 980
 981         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
 982                         queue) {
 983                 retval = _hardware_dequeue(hwep, hwreq);
 984                 if (retval < 0)
 985                         break;
 986                 list_del_init(&hwreq->queue);
 987                 if (hwreq->req.complete != NULL) {
 988                         spin_unlock(hwep->lock);
 989                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
 990                                         hwreq->req.length)
 991                                 hweptemp = hwep->ci->ep0in;
 992                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
 993                         spin_lock(hwep->lock);
 994                 }
 995         }
 996
 997         if (retval == -EBUSY)
 998                 retval = 0;
 999
1000         return retval;
1001 }
1002
1003 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1004 {
1005         dev_warn(&ci->gadget.dev,
1006                 "connect the device to an alternate port if you want HNP\n");
1007         return isr_setup_status_phase(ci);
1008 }
1009
1010 /**
1011  * isr_setup_packet_handler: setup packet handler
1012  * @ci: UDC descriptor
1013  *
1014  * This function handles setup packet
1015  */
1016 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1017 __releases(ci->lock)
1018 __acquires(ci->lock)
1019 {
1020         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1021         struct usb_ctrlrequest req;
1022         int type, num, dir, err = -EINVAL;
1023         u8 tmode = 0;
1024
1025         /*
1026          * Flush data and handshake transactions of previous
1027          * setup packet.
1028          */
1029         _ep_nuke(ci->ep0out);
1030         _ep_nuke(ci->ep0in);
1031
1032         /* read_setup_packet */
1033         do {
1034                 hw_test_and_set_setup_guard(ci);
1035                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1036         } while (!hw_test_and_clear_setup_guard(ci));
1037
1038         type = req.bRequestType;
1039
1040         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1041
1042         switch (req.bRequest) {
1043         case USB_REQ_CLEAR_FEATURE:
1044                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1045                                 le16_to_cpu(req.wValue) ==
1046                                 USB_ENDPOINT_HALT) {
1047                         if (req.wLength != 0)
1048                                 break;
1049                         num  = le16_to_cpu(req.wIndex);
1050                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1051                         num &= USB_ENDPOINT_NUMBER_MASK;
1052                         if (dir == TX)
1053                                 num += ci->hw_ep_max / 2;
1054                         if (!ci->ci_hw_ep[num].wedge) {
1055                                 spin_unlock(&ci->lock);
1056                                 err = usb_ep_clear_halt(
1057                                         &ci->ci_hw_ep[num].ep);
1058                                 spin_lock(&ci->lock);
1059                                 if (err)
1060                                         break;
1061                         }
1062                         err = isr_setup_status_phase(ci);
1063                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1064                                 le16_to_cpu(req.wValue) ==
1065                                 USB_DEVICE_REMOTE_WAKEUP) {
1066                         if (req.wLength != 0)
1067                                 break;
1068                         ci->remote_wakeup = 0;
1069                         err = isr_setup_status_phase(ci);
1070                 } else {
1071                         goto delegate;
1072                 }
1073                 break;
1074         case USB_REQ_GET_STATUS:
1075                 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1076                         le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1077                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1078                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1079                         goto delegate;
1080                 if (le16_to_cpu(req.wLength) != 2 ||
1081                     le16_to_cpu(req.wValue)  != 0)
1082                         break;
1083                 err = isr_get_status_response(ci, &req);
1084                 break;
1085         case USB_REQ_SET_ADDRESS:
1086                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1087                         goto delegate;
1088                 if (le16_to_cpu(req.wLength) != 0 ||
1089                     le16_to_cpu(req.wIndex)  != 0)
1090                         break;
1091                 ci->address = (u8)le16_to_cpu(req.wValue);
1092                 ci->setaddr = true;
1093                 err = isr_setup_status_phase(ci);
1094                 break;
1095         case USB_REQ_SET_FEATURE:
1096                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1097                                 le16_to_cpu(req.wValue) ==
1098                                 USB_ENDPOINT_HALT) {
1099                         if (req.wLength != 0)
1100                                 break;
1101                         num  = le16_to_cpu(req.wIndex);
1102                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1103                         num &= USB_ENDPOINT_NUMBER_MASK;
1104                         if (dir == TX)
1105                                 num += ci->hw_ep_max / 2;
1106
1107                         spin_unlock(&ci->lock);
1108                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1109                         spin_lock(&ci->lock);
1110                         if (!err)
1111                                 isr_setup_status_phase(ci);
1112                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1113                         if (req.wLength != 0)
1114                                 break;
1115                         switch (le16_to_cpu(req.wValue)) {
1116                         case USB_DEVICE_REMOTE_WAKEUP:
1117                                 ci->remote_wakeup = 1;
1118                                 err = isr_setup_status_phase(ci);
1119                                 break;
1120                         case USB_DEVICE_TEST_MODE:
1121                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1122                                 switch (tmode) {
1123                                 case TEST_J:
1124                                 case TEST_K:
1125                                 case TEST_SE0_NAK:
1126                                 case TEST_PACKET:
1127                                 case TEST_FORCE_EN:
1128                                         ci->test_mode = tmode;
1129                                         err = isr_setup_status_phase(
1130                                                         ci);
1131                                         break;
1132                                 default:
1133                                         break;
1134                                 }
1135                                 break;
1136                         case USB_DEVICE_B_HNP_ENABLE:
1137                                 if (ci_otg_is_fsm_mode(ci)) {
1138                                         ci->gadget.b_hnp_enable = 1;
1139                                         err = isr_setup_status_phase(
1140                                                         ci);
1141                                 }
1142                                 break;
1143                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1144                                 if (ci_otg_is_fsm_mode(ci))
1145                                         err = otg_a_alt_hnp_support(ci);
1146                                 break;
1147                         case USB_DEVICE_A_HNP_SUPPORT:
1148                                 if (ci_otg_is_fsm_mode(ci)) {
1149                                         ci->gadget.a_hnp_support = 1;
1150                                         err = isr_setup_status_phase(
1151                                                         ci);
1152                                 }
1153                                 break;
1154                         default:
1155                                 goto delegate;
1156                         }
1157                 } else {
1158                         goto delegate;
1159                 }
1160                 break;
1161         default:
1162 delegate:
1163                 if (req.wLength == 0)   /* no data phase */
1164                         ci->ep0_dir = TX;
1165
1166                 spin_unlock(&ci->lock);
1167                 err = ci->driver->setup(&ci->gadget, &req);
1168                 spin_lock(&ci->lock);
1169                 break;
1170         }
1171
1172         if (err < 0) {
1173                 spin_unlock(&ci->lock);
1174                 if (_ep_set_halt(&hwep->ep, 1, false))
1175                         dev_err(ci->dev, "error: _ep_set_halt\n");
1176                 spin_lock(&ci->lock);
1177         }
1178 }
1179
1180 /**
1181  * isr_tr_complete_handler: transaction complete interrupt handler
1182  * @ci: UDC descriptor
1183  *
1184  * This function handles traffic events
1185  */
1186 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1187 __releases(ci->lock)
1188 __acquires(ci->lock)
1189 {
1190         unsigned i;
1191         int err;
1192
1193         for (i = 0; i < ci->hw_ep_max; i++) {
1194                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1195
1196                 if (hwep->ep.desc == NULL)
1197                         continue;   /* not configured */
1198
1199                 if (hw_test_and_clear_complete(ci, i)) {
1200                         err = isr_tr_complete_low(hwep);
1201                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1202                                 if (err > 0)   /* needs status phase */
1203                                         err = isr_setup_status_phase(ci);
1204                                 if (err < 0) {
1205                                         spin_unlock(&ci->lock);
1206                                         if (_ep_set_halt(&hwep->ep, 1, false))
1207                                                 dev_err(ci->dev,
1208                                                 "error: _ep_set_halt\n");
1209                                         spin_lock(&ci->lock);
1210                                 }
1211                         }
1212                 }
1213
1214                 /* Only handle setup packet below */
1215                 if (i == 0 &&
1216                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1217                         isr_setup_packet_handler(ci);
1218         }
1219 }
1220
1221 /******************************************************************************
1222  * ENDPT block
1223  *****************************************************************************/
1224 /**
1225  * ep_enable: configure endpoint, making it usable
1226  *
1227  * Check usb_ep_enable() at "usb_gadget.h" for details
1228  */
1229 static int ep_enable(struct usb_ep *ep,
1230                      const struct usb_endpoint_descriptor *desc)
1231 {
1232         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1233         int retval = 0;
1234         unsigned long flags;
1235         u32 cap = 0;
1236
1237         if (ep == NULL || desc == NULL)
1238                 return -EINVAL;
1239
1240         spin_lock_irqsave(hwep->lock, flags);
1241
1242         /* only internal SW should enable ctrl endpts */
1243
1244         if (!list_empty(&hwep->qh.queue)) {
1245                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1246                 spin_unlock_irqrestore(hwep->lock, flags);
1247                 return -EBUSY;
1248         }
1249
1250         hwep->ep.desc = desc;
1251
1252         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1253         hwep->num  = usb_endpoint_num(desc);
1254         hwep->type = usb_endpoint_type(desc);
1255
1256         hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1257         hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1258
1259         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1260                 cap |= QH_IOS;
1261
1262         cap |= QH_ZLT;
1263         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1264         /*
1265          * For ISO-TX, we set mult at QH as the largest value, and use
1266          * MultO at TD as real mult value.
1267          */
1268         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1269                 cap |= 3 << __ffs(QH_MULT);
1270
1271         hwep->qh.ptr->cap = cpu_to_le32(cap);
1272
1273         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1274
1275         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1276                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1277                 retval = -EINVAL;
1278         }
1279
1280         /*
1281          * Enable endpoints in the HW other than ep0 as ep0
1282          * is always enabled
1283          */
1284         if (hwep->num)
1285                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1286                                        hwep->type);
1287
1288         spin_unlock_irqrestore(hwep->lock, flags);
1289         return retval;
1290 }
1291
1292 /**
1293  * ep_disable: endpoint is no longer usable
1294  *
1295  * Check usb_ep_disable() at "usb_gadget.h" for details
1296  */
1297 static int ep_disable(struct usb_ep *ep)
1298 {
1299         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1300         int direction, retval = 0;
1301         unsigned long flags;
1302
1303         if (ep == NULL)
1304                 return -EINVAL;
1305         else if (hwep->ep.desc == NULL)
1306                 return -EBUSY;
1307
1308         spin_lock_irqsave(hwep->lock, flags);
1309
1310         /* only internal SW should disable ctrl endpts */
1311
1312         direction = hwep->dir;
1313         do {
1314                 retval |= _ep_nuke(hwep);
1315                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1316
1317                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1318                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1319
1320         } while (hwep->dir != direction);
1321
1322         hwep->ep.desc = NULL;
1323
1324         spin_unlock_irqrestore(hwep->lock, flags);
1325         return retval;
1326 }
1327
1328 /**
1329  * ep_alloc_request: allocate a request object to use with this endpoint
1330  *
1331  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1332  */
1333 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1334 {
1335         struct ci_hw_req *hwreq = NULL;
1336
1337         if (ep == NULL)
1338                 return NULL;
1339
1340         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1341         if (hwreq != NULL) {
1342                 INIT_LIST_HEAD(&hwreq->queue);
1343                 INIT_LIST_HEAD(&hwreq->tds);
1344         }
1345
1346         return (hwreq == NULL) ? NULL : &hwreq->req;
1347 }
1348
1349 /**
1350  * ep_free_request: frees a request object
1351  *
1352  * Check usb_ep_free_request() at "usb_gadget.h" for details
1353  */
1354 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1355 {
1356         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1357         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1358         struct td_node *node, *tmpnode;
1359         unsigned long flags;
1360
1361         if (ep == NULL || req == NULL) {
1362                 return;
1363         } else if (!list_empty(&hwreq->queue)) {
1364                 dev_err(hwep->ci->dev, "freeing queued request\n");
1365                 return;
1366         }
1367
1368         spin_lock_irqsave(hwep->lock, flags);
1369
1370         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1371                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1372                 list_del_init(&node->td);
1373                 node->ptr = NULL;
1374                 kfree(node);
1375         }
1376
1377         kfree(hwreq);
1378
1379         spin_unlock_irqrestore(hwep->lock, flags);
1380 }
1381
1382 /**
1383  * ep_queue: queues (submits) an I/O request to an endpoint
1384  *
1385  * Check usb_ep_queue()* at usb_gadget.h" for details
1386  */
1387 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1388                     gfp_t __maybe_unused gfp_flags)
1389 {
1390         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1391         int retval = 0;
1392         unsigned long flags;
1393
1394         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1395                 return -EINVAL;
1396
1397         spin_lock_irqsave(hwep->lock, flags);
1398         retval = _ep_queue(ep, req, gfp_flags);
1399         spin_unlock_irqrestore(hwep->lock, flags);
1400         return retval;
1401 }
1402
1403 /**
1404  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1405  *
1406  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1407  */
1408 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1409 {
1410         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1411         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1412         unsigned long flags;
1413         struct td_node *node, *tmpnode;
1414
1415         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1416                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1417                 list_empty(&hwep->qh.queue))
1418                 return -EINVAL;
1419
1420         spin_lock_irqsave(hwep->lock, flags);
1421
1422         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1423
1424         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1425                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1426                 list_del(&node->td);
1427                 kfree(node);
1428         }
1429
1430         /* pop request */
1431         list_del_init(&hwreq->queue);
1432
1433         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1434
1435         req->status = -ECONNRESET;
1436
1437         if (hwreq->req.complete != NULL) {
1438                 spin_unlock(hwep->lock);
1439                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1440                 spin_lock(hwep->lock);
1441         }
1442
1443         spin_unlock_irqrestore(hwep->lock, flags);
1444         return 0;
1445 }
1446
1447 /**
1448  * ep_set_halt: sets the endpoint halt feature
1449  *
1450  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1451  */
1452 static int ep_set_halt(struct usb_ep *ep, int value)
1453 {
1454         return _ep_set_halt(ep, value, true);
1455 }
1456
1457 /**
1458  * ep_set_wedge: sets the halt feature and ignores clear requests
1459  *
1460  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1461  */
1462 static int ep_set_wedge(struct usb_ep *ep)
1463 {
1464         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1465         unsigned long flags;
1466
1467         if (ep == NULL || hwep->ep.desc == NULL)
1468                 return -EINVAL;
1469
1470         spin_lock_irqsave(hwep->lock, flags);
1471         hwep->wedge = 1;
1472         spin_unlock_irqrestore(hwep->lock, flags);
1473
1474         return usb_ep_set_halt(ep);
1475 }
1476
1477 /**
1478  * ep_fifo_flush: flushes contents of a fifo
1479  *
1480  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1481  */
1482 static void ep_fifo_flush(struct usb_ep *ep)
1483 {
1484         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1485         unsigned long flags;
1486
1487         if (ep == NULL) {
1488                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1489                 return;
1490         }
1491
1492         spin_lock_irqsave(hwep->lock, flags);
1493
1494         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1495
1496         spin_unlock_irqrestore(hwep->lock, flags);
1497 }
1498
1499 /**
1500  * Endpoint-specific part of the API to the USB controller hardware
1501  * Check "usb_gadget.h" for details
1502  */
1503 static const struct usb_ep_ops usb_ep_ops = {
1504         .enable        = ep_enable,
1505         .disable       = ep_disable,
1506         .alloc_request = ep_alloc_request,
1507         .free_request  = ep_free_request,
1508         .queue         = ep_queue,
1509         .dequeue       = ep_dequeue,
1510         .set_halt      = ep_set_halt,
1511         .set_wedge     = ep_set_wedge,
1512         .fifo_flush    = ep_fifo_flush,
1513 };
1514
1515 /******************************************************************************
1516  * GADGET block
1517  *****************************************************************************/
1518 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1519 {
1520         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1521         unsigned long flags;
1522         int gadget_ready = 0;
1523
1524         spin_lock_irqsave(&ci->lock, flags);
1525         ci->vbus_active = is_active;
1526         if (ci->driver)
1527                 gadget_ready = 1;
1528         spin_unlock_irqrestore(&ci->lock, flags);
1529
1530         if (ci->usb_phy)
1531                 usb_phy_set_charger_state(ci->usb_phy, is_active ?
1532                         USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
1533
1534         if (gadget_ready) {
1535                 if (is_active) {
1536                         pm_runtime_get_sync(&_gadget->dev);
1537                         hw_device_reset(ci);
1538                         hw_device_state(ci, ci->ep0out->qh.dma);
1539                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1540                         usb_udc_vbus_handler(_gadget, true);
1541                 } else {
1542                         usb_udc_vbus_handler(_gadget, false);
1543                         if (ci->driver)
1544                                 ci->driver->disconnect(&ci->gadget);
1545                         hw_device_state(ci, 0);
1546                         if (ci->platdata->notify_event)
1547                                 ci->platdata->notify_event(ci,
1548                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1549                         _gadget_stop_activity(&ci->gadget);
1550                         pm_runtime_put_sync(&_gadget->dev);
1551                         usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1552                 }
1553         }
1554
1555         return 0;
1556 }
1557
1558 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1559 {
1560         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1561         unsigned long flags;
1562         int ret = 0;
1563
1564         spin_lock_irqsave(&ci->lock, flags);
1565         if (!ci->remote_wakeup) {
1566                 ret = -EOPNOTSUPP;
1567                 goto out;
1568         }
1569         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1570                 ret = -EINVAL;
1571                 goto out;
1572         }
1573         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1574 out:
1575         spin_unlock_irqrestore(&ci->lock, flags);
1576         return ret;
1577 }
1578
1579 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1580 {
1581         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1582
1583         if (ci->usb_phy)
1584                 return usb_phy_set_power(ci->usb_phy, ma);
1585         return -ENOTSUPP;
1586 }
1587
1588 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1589 {
1590         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1591         struct ci_hw_ep *hwep = ci->ep0in;
1592         unsigned long flags;
1593
1594         spin_lock_irqsave(hwep->lock, flags);
1595         _gadget->is_selfpowered = (is_on != 0);
1596         spin_unlock_irqrestore(hwep->lock, flags);
1597
1598         return 0;
1599 }
1600
1601 /* Change Data+ pullup status
1602  * this func is used by usb_gadget_connect/disconnet
1603  */
1604 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1605 {
1606         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1607
1608         /*
1609          * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1610          * and don't touch Data+ in host mode for dual role config.
1611          */
1612         if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1613                 return 0;
1614
1615         pm_runtime_get_sync(&ci->gadget.dev);
1616         if (is_on)
1617                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1618         else
1619                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1620         pm_runtime_put_sync(&ci->gadget.dev);
1621
1622         return 0;
1623 }
1624
1625 static int ci_udc_start(struct usb_gadget *gadget,
1626                          struct usb_gadget_driver *driver);
1627 static int ci_udc_stop(struct usb_gadget *gadget);
1628 /**
1629  * Device operations part of the API to the USB controller hardware,
1630  * which don't involve endpoints (or i/o)
1631  * Check  "usb_gadget.h" for details
1632  */
1633 static const struct usb_gadget_ops usb_gadget_ops = {
1634         .vbus_session   = ci_udc_vbus_session,
1635         .wakeup         = ci_udc_wakeup,
1636         .set_selfpowered        = ci_udc_selfpowered,
1637         .pullup         = ci_udc_pullup,
1638         .vbus_draw      = ci_udc_vbus_draw,
1639         .udc_start      = ci_udc_start,
1640         .udc_stop       = ci_udc_stop,
1641 };
1642
1643 static int init_eps(struct ci_hdrc *ci)
1644 {
1645         int retval = 0, i, j;
1646
1647         for (i = 0; i < ci->hw_ep_max/2; i++)
1648                 for (j = RX; j <= TX; j++) {
1649                         int k = i + j * ci->hw_ep_max/2;
1650                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1651
1652                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1653                                         (j == TX)  ? "in" : "out");
1654
1655                         hwep->ci          = ci;
1656                         hwep->lock         = &ci->lock;
1657                         hwep->td_pool      = ci->td_pool;
1658
1659                         hwep->ep.name      = hwep->name;
1660                         hwep->ep.ops       = &usb_ep_ops;
1661
1662                         if (i == 0) {
1663                                 hwep->ep.caps.type_control = true;
1664                         } else {
1665                                 hwep->ep.caps.type_iso = true;
1666                                 hwep->ep.caps.type_bulk = true;
1667                                 hwep->ep.caps.type_int = true;
1668                         }
1669
1670                         if (j == TX)
1671                                 hwep->ep.caps.dir_in = true;
1672                         else
1673                                 hwep->ep.caps.dir_out = true;
1674
1675                         /*
1676                          * for ep0: maxP defined in desc, for other
1677                          * eps, maxP is set by epautoconfig() called
1678                          * by gadget layer
1679                          */
1680                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1681
1682                         INIT_LIST_HEAD(&hwep->qh.queue);
1683                         hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1684                                                        &hwep->qh.dma);
1685                         if (hwep->qh.ptr == NULL)
1686                                 retval = -ENOMEM;
1687
1688                         /*
1689                          * set up shorthands for ep0 out and in endpoints,
1690                          * don't add to gadget's ep_list
1691                          */
1692                         if (i == 0) {
1693                                 if (j == RX)
1694                                         ci->ep0out = hwep;
1695                                 else
1696                                         ci->ep0in = hwep;
1697
1698                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1699                                 continue;
1700                         }
1701
1702                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1703                 }
1704
1705         return retval;
1706 }
1707
1708 static void destroy_eps(struct ci_hdrc *ci)
1709 {
1710         int i;
1711
1712         for (i = 0; i < ci->hw_ep_max; i++) {
1713                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1714
1715                 if (hwep->pending_td)
1716                         free_pending_td(hwep);
1717                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1718         }
1719 }
1720
1721 /**
1722  * ci_udc_start: register a gadget driver
1723  * @gadget: our gadget
1724  * @driver: the driver being registered
1725  *
1726  * Interrupts are enabled here.
1727  */
1728 static int ci_udc_start(struct usb_gadget *gadget,
1729                          struct usb_gadget_driver *driver)
1730 {
1731         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1732         int retval = -ENOMEM;
1733
1734         if (driver->disconnect == NULL)
1735                 return -EINVAL;
1736
1737
1738         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1739         retval = usb_ep_enable(&ci->ep0out->ep);
1740         if (retval)
1741                 return retval;
1742
1743         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1744         retval = usb_ep_enable(&ci->ep0in->ep);
1745         if (retval)
1746                 return retval;
1747
1748         ci->driver = driver;
1749
1750         /* Start otg fsm for B-device */
1751         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1752                 ci_hdrc_otg_fsm_start(ci);
1753                 return retval;
1754         }
1755
1756         pm_runtime_get_sync(&ci->gadget.dev);
1757         if (ci->vbus_active) {
1758                 hw_device_reset(ci);
1759         } else {
1760                 usb_udc_vbus_handler(&ci->gadget, false);
1761                 pm_runtime_put_sync(&ci->gadget.dev);
1762                 return retval;
1763         }
1764
1765         retval = hw_device_state(ci, ci->ep0out->qh.dma);
1766         if (retval)
1767                 pm_runtime_put_sync(&ci->gadget.dev);
1768
1769         return retval;
1770 }
1771
1772 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1773 {
1774         if (!ci_otg_is_fsm_mode(ci))
1775                 return;
1776
1777         mutex_lock(&ci->fsm.lock);
1778         if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1779                 ci->fsm.a_bidl_adis_tmout = 1;
1780                 ci_hdrc_otg_fsm_start(ci);
1781         } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1782                 ci->fsm.protocol = PROTO_UNDEF;
1783                 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1784         }
1785         mutex_unlock(&ci->fsm.lock);
1786 }
1787
1788 /**
1789  * ci_udc_stop: unregister a gadget driver
1790  */
1791 static int ci_udc_stop(struct usb_gadget *gadget)
1792 {
1793         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1794         unsigned long flags;
1795
1796         spin_lock_irqsave(&ci->lock, flags);
1797
1798         if (ci->vbus_active) {
1799                 hw_device_state(ci, 0);
1800                 spin_unlock_irqrestore(&ci->lock, flags);
1801                 if (ci->platdata->notify_event)
1802                         ci->platdata->notify_event(ci,
1803                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1804                 _gadget_stop_activity(&ci->gadget);
1805                 spin_lock_irqsave(&ci->lock, flags);
1806                 pm_runtime_put(&ci->gadget.dev);
1807         }
1808
1809         ci->driver = NULL;
1810         spin_unlock_irqrestore(&ci->lock, flags);
1811
1812         ci_udc_stop_for_otg_fsm(ci);
1813         return 0;
1814 }
1815
1816 /******************************************************************************
1817  * BUS block
1818  *****************************************************************************/
1819 /**
1820  * udc_irq: ci interrupt handler
1821  *
1822  * This function returns IRQ_HANDLED if the IRQ has been handled
1823  * It locks access to registers
1824  */
1825 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1826 {
1827         irqreturn_t retval;
1828         u32 intr;
1829
1830         if (ci == NULL)
1831                 return IRQ_HANDLED;
1832
1833         spin_lock(&ci->lock);
1834
1835         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1836                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1837                                 USBMODE_CM_DC) {
1838                         spin_unlock(&ci->lock);
1839                         return IRQ_NONE;
1840                 }
1841         }
1842         intr = hw_test_and_clear_intr_active(ci);
1843
1844         if (intr) {
1845                 /* order defines priority - do NOT change it */
1846                 if (USBi_URI & intr)
1847                         isr_reset_handler(ci);
1848
1849                 if (USBi_PCI & intr) {
1850                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
1851                                 USB_SPEED_HIGH : USB_SPEED_FULL;
1852                         if (ci->suspended) {
1853                                 if (ci->driver->resume) {
1854                                         spin_unlock(&ci->lock);
1855                                         ci->driver->resume(&ci->gadget);
1856                                         spin_lock(&ci->lock);
1857                                 }
1858                                 ci->suspended = 0;
1859                                 usb_gadget_set_state(&ci->gadget,
1860                                                 ci->resume_state);
1861                         }
1862                 }
1863
1864                 if (USBi_UI  & intr)
1865                         isr_tr_complete_handler(ci);
1866
1867                 if ((USBi_SLI & intr) && !(ci->suspended)) {
1868                         ci->suspended = 1;
1869                         ci->resume_state = ci->gadget.state;
1870                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1871                             ci->driver->suspend) {
1872                                 spin_unlock(&ci->lock);
1873                                 ci->driver->suspend(&ci->gadget);
1874                                 spin_lock(&ci->lock);
1875                         }
1876                         usb_gadget_set_state(&ci->gadget,
1877                                         USB_STATE_SUSPENDED);
1878                 }
1879                 retval = IRQ_HANDLED;
1880         } else {
1881                 retval = IRQ_NONE;
1882         }
1883         spin_unlock(&ci->lock);
1884
1885         return retval;
1886 }
1887
1888 /**
1889  * udc_start: initialize gadget role
1890  * @ci: chipidea controller
1891  */
1892 static int udc_start(struct ci_hdrc *ci)
1893 {
1894         struct device *dev = ci->dev;
1895         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1896         int retval = 0;
1897
1898         ci->gadget.ops          = &usb_gadget_ops;
1899         ci->gadget.speed        = USB_SPEED_UNKNOWN;
1900         ci->gadget.max_speed    = USB_SPEED_HIGH;
1901         ci->gadget.name         = ci->platdata->name;
1902         ci->gadget.otg_caps     = otg_caps;
1903
1904         if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
1905                 ci->gadget.quirk_avoids_skb_reserve = 1;
1906
1907         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1908                                                 otg_caps->adp_support))
1909                 ci->gadget.is_otg = 1;
1910
1911         INIT_LIST_HEAD(&ci->gadget.ep_list);
1912
1913         /* alloc resources */
1914         ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
1915                                        sizeof(struct ci_hw_qh),
1916                                        64, CI_HDRC_PAGE_SIZE);
1917         if (ci->qh_pool == NULL)
1918                 return -ENOMEM;
1919
1920         ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
1921                                        sizeof(struct ci_hw_td),
1922                                        64, CI_HDRC_PAGE_SIZE);
1923         if (ci->td_pool == NULL) {
1924                 retval = -ENOMEM;
1925                 goto free_qh_pool;
1926         }
1927
1928         retval = init_eps(ci);
1929         if (retval)
1930                 goto free_pools;
1931
1932         ci->gadget.ep0 = &ci->ep0in->ep;
1933
1934         retval = usb_add_gadget_udc(dev, &ci->gadget);
1935         if (retval)
1936                 goto destroy_eps;
1937
1938         pm_runtime_no_callbacks(&ci->gadget.dev);
1939         pm_runtime_enable(&ci->gadget.dev);
1940
1941         return retval;
1942
1943 destroy_eps:
1944         destroy_eps(ci);
1945 free_pools:
1946         dma_pool_destroy(ci->td_pool);
1947 free_qh_pool:
1948         dma_pool_destroy(ci->qh_pool);
1949         return retval;
1950 }
1951
1952 /**
1953  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1954  *
1955  * No interrupts active, the IRQ has been released
1956  */
1957 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1958 {
1959         if (!ci->roles[CI_ROLE_GADGET])
1960                 return;
1961
1962         usb_del_gadget_udc(&ci->gadget);
1963
1964         destroy_eps(ci);
1965
1966         dma_pool_destroy(ci->td_pool);
1967         dma_pool_destroy(ci->qh_pool);
1968 }
1969
1970 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1971 {
1972         if (ci->is_otg)
1973                 /* Clear and enable BSV irq */
1974                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1975                                         OTGSC_BSVIS | OTGSC_BSVIE);
1976
1977         return 0;
1978 }
1979
1980 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1981 {
1982         /*
1983          * host doesn't care B_SESSION_VALID event
1984          * so clear and disbale BSV irq
1985          */
1986         if (ci->is_otg)
1987                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1988
1989         ci->vbus_active = 0;
1990 }
1991
1992 /**
1993  * ci_hdrc_gadget_init - initialize device related bits
1994  * ci: the controller
1995  *
1996  * This function initializes the gadget, if the device is "device capable".
1997  */
1998 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1999 {
2000         struct ci_role_driver *rdrv;
2001         int ret;
2002
2003         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2004                 return -ENXIO;
2005
2006         rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2007         if (!rdrv)
2008                 return -ENOMEM;
2009
2010         rdrv->start     = udc_id_switch_for_device;
2011         rdrv->stop      = udc_id_switch_for_host;
2012         rdrv->irq       = udc_irq;
2013         rdrv->name      = "gadget";
2014
2015         ret = udc_start(ci);
2016         if (!ret)
2017                 ci->roles[CI_ROLE_GADGET] = rdrv;
2018
2019         return ret;
2020 }