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
  10 #include <linux/delay.h>
  11 #include <linux/device.h>
  12 #include <linux/dmapool.h>
  13 #include <linux/err.h>
  14 #include <linux/irqreturn.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/usb/ch9.h>
  19 #include <linux/usb/gadget.h>
  20 #include <linux/usb/otg-fsm.h>
  21 #include <linux/usb/chipidea.h>
  22
  23 #include "ci.h"
  24 #include "udc.h"
  25 #include "bits.h"
  26 #include "otg.h"
  27 #include "otg_fsm.h"
  28
  29 /* control endpoint description */
  30 static const struct usb_endpoint_descriptor
  31 ctrl_endpt_out_desc = {
  32         .bLength         = USB_DT_ENDPOINT_SIZE,
  33         .bDescriptorType = USB_DT_ENDPOINT,
  34
  35         .bEndpointAddress = USB_DIR_OUT,
  36         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  37         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  38 };
  39
  40 static const struct usb_endpoint_descriptor
  41 ctrl_endpt_in_desc = {
  42         .bLength         = USB_DT_ENDPOINT_SIZE,
  43         .bDescriptorType = USB_DT_ENDPOINT,
  44
  45         .bEndpointAddress = USB_DIR_IN,
  46         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  47         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  48 };
  49
  50 /**
  51  * hw_ep_bit: calculates the bit number
  52  * @num: endpoint number
  53  * @dir: endpoint direction
  54  *
  55  * This function returns bit number
  56  */
  57 static inline int hw_ep_bit(int num, int dir)
  58 {
  59         return num + ((dir == TX) ? 16 : 0);
  60 }
  61
  62 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
  63 {
  64         int fill = 16 - ci->hw_ep_max / 2;
  65
  66         if (n >= ci->hw_ep_max / 2)
  67                 n += fill;
  68
  69         return n;
  70 }
  71
  72 /**
  73  * hw_device_state: enables/disables interrupts (execute without interruption)
  74  * @dma: 0 => disable, !0 => enable and set dma engine
  75  *
  76  * This function returns an error code
  77  */
  78 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
  79 {
  80         if (dma) {
  81                 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
  82                 /* interrupt, error, port change, reset, sleep/suspend */
  83                 hw_write(ci, OP_USBINTR, ~0,
  84                              USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
  85         } else {
  86                 hw_write(ci, OP_USBINTR, ~0, 0);
  87         }
  88         return 0;
  89 }
  90
  91 /**
  92  * hw_ep_flush: flush endpoint fifo (execute without interruption)
  93  * @num: endpoint number
  94  * @dir: endpoint direction
  95  *
  96  * This function returns an error code
  97  */
  98 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
  99 {
 100         int n = hw_ep_bit(num, dir);
 101
 102         do {
 103                 /* flush any pending transfer */
 104                 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
 105                 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
 106                         cpu_relax();
 107         } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
 108
 109         return 0;
 110 }
 111
 112 /**
 113  * hw_ep_disable: disables endpoint (execute without interruption)
 114  * @num: endpoint number
 115  * @dir: endpoint direction
 116  *
 117  * This function returns an error code
 118  */
 119 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
 120 {
 121         hw_write(ci, OP_ENDPTCTRL + num,
 122                  (dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 123         return 0;
 124 }
 125
 126 /**
 127  * hw_ep_enable: enables endpoint (execute without interruption)
 128  * @num:  endpoint number
 129  * @dir:  endpoint direction
 130  * @type: endpoint type
 131  *
 132  * This function returns an error code
 133  */
 134 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
 135 {
 136         u32 mask, data;
 137
 138         if (dir == TX) {
 139                 mask  = ENDPTCTRL_TXT;  /* type    */
 140                 data  = type << __ffs(mask);
 141
 142                 mask |= ENDPTCTRL_TXS;  /* unstall */
 143                 mask |= ENDPTCTRL_TXR;  /* reset data toggle */
 144                 data |= ENDPTCTRL_TXR;
 145                 mask |= ENDPTCTRL_TXE;  /* enable  */
 146                 data |= ENDPTCTRL_TXE;
 147         } else {
 148                 mask  = ENDPTCTRL_RXT;  /* type    */
 149                 data  = type << __ffs(mask);
 150
 151                 mask |= ENDPTCTRL_RXS;  /* unstall */
 152                 mask |= ENDPTCTRL_RXR;  /* reset data toggle */
 153                 data |= ENDPTCTRL_RXR;
 154                 mask |= ENDPTCTRL_RXE;  /* enable  */
 155                 data |= ENDPTCTRL_RXE;
 156         }
 157         hw_write(ci, OP_ENDPTCTRL + num, mask, data);
 158         return 0;
 159 }
 160
 161 /**
 162  * hw_ep_get_halt: return endpoint halt status
 163  * @num: endpoint number
 164  * @dir: endpoint direction
 165  *
 166  * This function returns 1 if endpoint halted
 167  */
 168 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
 169 {
 170         u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 171
 172         return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
 173 }
 174
 175 /**
 176  * hw_ep_prime: primes endpoint (execute without interruption)
 177  * @num:     endpoint number
 178  * @dir:     endpoint direction
 179  * @is_ctrl: true if control endpoint
 180  *
 181  * This function returns an error code
 182  */
 183 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
 184 {
 185         int n = hw_ep_bit(num, dir);
 186
 187         /* Synchronize before ep prime */
 188         wmb();
 189
 190         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 191                 return -EAGAIN;
 192
 193         hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
 194
 195         while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 196                 cpu_relax();
 197         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 198                 return -EAGAIN;
 199
 200         /* status shoult be tested according with manual but it doesn't work */
 201         return 0;
 202 }
 203
 204 /**
 205  * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
 206  *                 without interruption)
 207  * @num:   endpoint number
 208  * @dir:   endpoint direction
 209  * @value: true => stall, false => unstall
 210  *
 211  * This function returns an error code
 212  */
 213 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
 214 {
 215         if (value != 0 && value != 1)
 216                 return -EINVAL;
 217
 218         do {
 219                 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
 220                 u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 221                 u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
 222
 223                 /* data toggle - reserved for EP0 but it's in ESS */
 224                 hw_write(ci, reg, mask_xs|mask_xr,
 225                           value ? mask_xs : mask_xr);
 226         } while (value != hw_ep_get_halt(ci, num, dir));
 227
 228         return 0;
 229 }
 230
 231 /**
 232  * hw_is_port_high_speed: test if port is high speed
 233  *
 234  * This function returns true if high speed port
 235  */
 236 static int hw_port_is_high_speed(struct ci_hdrc *ci)
 237 {
 238         return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
 239                 hw_read(ci, OP_PORTSC, PORTSC_HSP);
 240 }
 241
 242 /**
 243  * hw_test_and_clear_complete: test & clear complete status (execute without
 244  *                             interruption)
 245  * @n: endpoint number
 246  *
 247  * This function returns complete status
 248  */
 249 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
 250 {
 251         n = ep_to_bit(ci, n);
 252         return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
 253 }
 254
 255 /**
 256  * hw_test_and_clear_intr_active: test & clear active interrupts (execute
 257  *                                without interruption)
 258  *
 259  * This function returns active interrutps
 260  */
 261 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
 262 {
 263         u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
 264
 265         hw_write(ci, OP_USBSTS, ~0, reg);
 266         return reg;
 267 }
 268
 269 /**
 270  * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
 271  *                                interruption)
 272  *
 273  * This function returns guard value
 274  */
 275 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
 276 {
 277         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
 278 }
 279
 280 /**
 281  * hw_test_and_set_setup_guard: test & set setup guard (execute without
 282  *                              interruption)
 283  *
 284  * This function returns guard value
 285  */
 286 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
 287 {
 288         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
 289 }
 290
 291 /**
 292  * hw_usb_set_address: configures USB address (execute without interruption)
 293  * @value: new USB address
 294  *
 295  * This function explicitly sets the address, without the "USBADRA" (advance)
 296  * feature, which is not supported by older versions of the controller.
 297  */
 298 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
 299 {
 300         hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
 301                  value << __ffs(DEVICEADDR_USBADR));
 302 }
 303
 304 /**
 305  * hw_usb_reset: restart device after a bus reset (execute without
 306  *               interruption)
 307  *
 308  * This function returns an error code
 309  */
 310 static int hw_usb_reset(struct ci_hdrc *ci)
 311 {
 312         hw_usb_set_address(ci, 0);
 313
 314         /* ESS flushes only at end?!? */
 315         hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
 316
 317         /* clear setup token semaphores */
 318         hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
 319
 320         /* clear complete status */
 321         hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
 322
 323         /* wait until all bits cleared */
 324         while (hw_read(ci, OP_ENDPTPRIME, ~0))
 325                 udelay(10);             /* not RTOS friendly */
 326
 327         /* reset all endpoints ? */
 328
 329         /* reset internal status and wait for further instructions
 330            no need to verify the port reset status (ESS does it) */
 331
 332         return 0;
 333 }
 334
 335 /******************************************************************************
 336  * UTIL block
 337  *****************************************************************************/
 338
 339 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 340                           unsigned length)
 341 {
 342         int i;
 343         u32 temp;
 344         struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
 345                                                   GFP_ATOMIC);
 346
 347         if (node == NULL)
 348                 return -ENOMEM;
 349
 350         node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma);
 351         if (node->ptr == NULL) {
 352                 kfree(node);
 353                 return -ENOMEM;
 354         }
 355
 356         node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
 357         node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
 358         node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
 359         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
 360                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 361
 362                 if (hwreq->req.length == 0
 363                                 || hwreq->req.length % hwep->ep.maxpacket)
 364                         mul++;
 365                 node->ptr->token |= cpu_to_le32(mul << __ffs(TD_MULTO));
 366         }
 367
 368         temp = (u32) (hwreq->req.dma + hwreq->req.actual);
 369         if (length) {
 370                 node->ptr->page[0] = cpu_to_le32(temp);
 371                 for (i = 1; i < TD_PAGE_COUNT; i++) {
 372                         u32 page = temp + i * CI_HDRC_PAGE_SIZE;
 373                         page &= ~TD_RESERVED_MASK;
 374                         node->ptr->page[i] = cpu_to_le32(page);
 375                 }
 376         }
 377
 378         hwreq->req.actual += length;
 379
 380         if (!list_empty(&hwreq->tds)) {
 381                 /* get the last entry */
 382                 lastnode = list_entry(hwreq->tds.prev,
 383                                 struct td_node, td);
 384                 lastnode->ptr->next = cpu_to_le32(node->dma);
 385         }
 386
 387         INIT_LIST_HEAD(&node->td);
 388         list_add_tail(&node->td, &hwreq->tds);
 389
 390         return 0;
 391 }
 392
 393 /**
 394  * _usb_addr: calculates endpoint address from direction & number
 395  * @ep:  endpoint
 396  */
 397 static inline u8 _usb_addr(struct ci_hw_ep *ep)
 398 {
 399         return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
 400 }
 401
 402 /**
 403  * _hardware_enqueue: configures a request at hardware level
 404  * @hwep:   endpoint
 405  * @hwreq:  request
 406  *
 407  * This function returns an error code
 408  */
 409 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 410 {
 411         struct ci_hdrc *ci = hwep->ci;
 412         int ret = 0;
 413         unsigned rest = hwreq->req.length;
 414         int pages = TD_PAGE_COUNT;
 415         struct td_node *firstnode, *lastnode;
 416
 417         /* don't queue twice */
 418         if (hwreq->req.status == -EALREADY)
 419                 return -EALREADY;
 420
 421         hwreq->req.status = -EALREADY;
 422
 423         ret = usb_gadget_map_request_by_dev(ci->dev->parent,
 424                                             &hwreq->req, hwep->dir);
 425         if (ret)
 426                 return ret;
 427
 428         /*
 429          * The first buffer could be not page aligned.
 430          * In that case we have to span into one extra td.
 431          */
 432         if (hwreq->req.dma % PAGE_SIZE)
 433                 pages--;
 434
 435         if (rest == 0) {
 436                 ret = add_td_to_list(hwep, hwreq, 0);
 437                 if (ret < 0)
 438                         goto done;
 439         }
 440
 441         while (rest > 0) {
 442                 unsigned count = min(hwreq->req.length - hwreq->req.actual,
 443                                         (unsigned)(pages * CI_HDRC_PAGE_SIZE));
 444                 ret = add_td_to_list(hwep, hwreq, count);
 445                 if (ret < 0)
 446                         goto done;
 447
 448                 rest -= count;
 449         }
 450
 451         if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
 452             && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
 453                 ret = add_td_to_list(hwep, hwreq, 0);
 454                 if (ret < 0)
 455                         goto done;
 456         }
 457
 458         firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 459
 460         lastnode = list_entry(hwreq->tds.prev,
 461                 struct td_node, td);
 462
 463         lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
 464         if (!hwreq->req.no_interrupt)
 465                 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
 466         wmb();
 467
 468         hwreq->req.actual = 0;
 469         if (!list_empty(&hwep->qh.queue)) {
 470                 struct ci_hw_req *hwreqprev;
 471                 int n = hw_ep_bit(hwep->num, hwep->dir);
 472                 int tmp_stat;
 473                 struct td_node *prevlastnode;
 474                 u32 next = firstnode->dma & TD_ADDR_MASK;
 475
 476                 hwreqprev = list_entry(hwep->qh.queue.prev,
 477                                 struct ci_hw_req, queue);
 478                 prevlastnode = list_entry(hwreqprev->tds.prev,
 479                                 struct td_node, td);
 480
 481                 prevlastnode->ptr->next = cpu_to_le32(next);
 482                 wmb();
 483                 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 484                         goto done;
 485                 do {
 486                         hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
 487                         tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
 488                 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
 489                 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
 490                 if (tmp_stat)
 491                         goto done;
 492         }
 493
 494         /*  QH configuration */
 495         hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
 496         hwep->qh.ptr->td.token &=
 497                 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
 498
 499         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
 500                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 501
 502                 if (hwreq->req.length == 0
 503                                 || hwreq->req.length % hwep->ep.maxpacket)
 504                         mul++;
 505                 hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT));
 506         }
 507
 508         ret = hw_ep_prime(ci, hwep->num, hwep->dir,
 509                            hwep->type == USB_ENDPOINT_XFER_CONTROL);
 510 done:
 511         return ret;
 512 }
 513
 514 /*
 515  * free_pending_td: remove a pending request for the endpoint
 516  * @hwep: endpoint
 517  */
 518 static void free_pending_td(struct ci_hw_ep *hwep)
 519 {
 520         struct td_node *pending = hwep->pending_td;
 521
 522         dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
 523         hwep->pending_td = NULL;
 524         kfree(pending);
 525 }
 526
 527 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
 528                                            struct td_node *node)
 529 {
 530         hwep->qh.ptr->td.next = cpu_to_le32(node->dma);
 531         hwep->qh.ptr->td.token &=
 532                 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
 533
 534         return hw_ep_prime(ci, hwep->num, hwep->dir,
 535                                 hwep->type == USB_ENDPOINT_XFER_CONTROL);
 536 }
 537
 538 /**
 539  * _hardware_dequeue: handles a request at hardware level
 540  * @gadget: gadget
 541  * @hwep:   endpoint
 542  *
 543  * This function returns an error code
 544  */
 545 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 546 {
 547         u32 tmptoken;
 548         struct td_node *node, *tmpnode;
 549         unsigned remaining_length;
 550         unsigned actual = hwreq->req.length;
 551         struct ci_hdrc *ci = hwep->ci;
 552
 553         if (hwreq->req.status != -EALREADY)
 554                 return -EINVAL;
 555
 556         hwreq->req.status = 0;
 557
 558         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 559                 tmptoken = le32_to_cpu(node->ptr->token);
 560                 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
 561                         int n = hw_ep_bit(hwep->num, hwep->dir);
 562
 563                         if (ci->rev == CI_REVISION_24)
 564                                 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 565                                         reprime_dtd(ci, hwep, node);
 566                         hwreq->req.status = -EALREADY;
 567                         return -EBUSY;
 568                 }
 569
 570                 remaining_length = (tmptoken & TD_TOTAL_BYTES);
 571                 remaining_length >>= __ffs(TD_TOTAL_BYTES);
 572                 actual -= remaining_length;
 573
 574                 hwreq->req.status = tmptoken & TD_STATUS;
 575                 if ((TD_STATUS_HALTED & hwreq->req.status)) {
 576                         hwreq->req.status = -EPIPE;
 577                         break;
 578                 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
 579                         hwreq->req.status = -EPROTO;
 580                         break;
 581                 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
 582                         hwreq->req.status = -EILSEQ;
 583                         break;
 584                 }
 585
 586                 if (remaining_length) {
 587                         if (hwep->dir == TX) {
 588                                 hwreq->req.status = -EPROTO;
 589                                 break;
 590                         }
 591                 }
 592                 /*
 593                  * As the hardware could still address the freed td
 594                  * which will run the udc unusable, the cleanup of the
 595                  * td has to be delayed by one.
 596                  */
 597                 if (hwep->pending_td)
 598                         free_pending_td(hwep);
 599
 600                 hwep->pending_td = node;
 601                 list_del_init(&node->td);
 602         }
 603
 604         usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
 605                                         &hwreq->req, hwep->dir);
 606
 607         hwreq->req.actual += actual;
 608
 609         if (hwreq->req.status)
 610                 return hwreq->req.status;
 611
 612         return hwreq->req.actual;
 613 }
 614
 615 /**
 616  * _ep_nuke: dequeues all endpoint requests
 617  * @hwep: endpoint
 618  *
 619  * This function returns an error code
 620  * Caller must hold lock
 621  */
 622 static int _ep_nuke(struct ci_hw_ep *hwep)
 623 __releases(hwep->lock)
 624 __acquires(hwep->lock)
 625 {
 626         struct td_node *node, *tmpnode;
 627         if (hwep == NULL)
 628                 return -EINVAL;
 629
 630         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
 631
 632         while (!list_empty(&hwep->qh.queue)) {
 633
 634                 /* pop oldest request */
 635                 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
 636                                                      struct ci_hw_req, queue);
 637
 638                 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 639                         dma_pool_free(hwep->td_pool, node->ptr, node->dma);
 640                         list_del_init(&node->td);
 641                         node->ptr = NULL;
 642                         kfree(node);
 643                 }
 644
 645                 list_del_init(&hwreq->queue);
 646                 hwreq->req.status = -ESHUTDOWN;
 647
 648                 if (hwreq->req.complete != NULL) {
 649                         spin_unlock(hwep->lock);
 650                         usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
 651                         spin_lock(hwep->lock);
 652                 }
 653         }
 654
 655         if (hwep->pending_td)
 656                 free_pending_td(hwep);
 657
 658         return 0;
 659 }
 660
 661 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
 662 {
 663         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
 664         int direction, retval = 0;
 665         unsigned long flags;
 666
 667         if (ep == NULL || hwep->ep.desc == NULL)
 668                 return -EINVAL;
 669
 670         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
 671                 return -EOPNOTSUPP;
 672
 673         spin_lock_irqsave(hwep->lock, flags);
 674
 675         if (value && hwep->dir == TX && check_transfer &&
 676                 !list_empty(&hwep->qh.queue) &&
 677                         !usb_endpoint_xfer_control(hwep->ep.desc)) {
 678                 spin_unlock_irqrestore(hwep->lock, flags);
 679                 return -EAGAIN;
 680         }
 681
 682         direction = hwep->dir;
 683         do {
 684                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
 685
 686                 if (!value)
 687                         hwep->wedge = 0;
 688
 689                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
 690                         hwep->dir = (hwep->dir == TX) ? RX : TX;
 691
 692         } while (hwep->dir != direction);
 693
 694         spin_unlock_irqrestore(hwep->lock, flags);
 695         return retval;
 696 }
 697
 698
 699 /**
 700  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 701  * @gadget: gadget
 702  *
 703  * This function returns an error code
 704  */
 705 static int _gadget_stop_activity(struct usb_gadget *gadget)
 706 {
 707         struct usb_ep *ep;
 708         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 709         unsigned long flags;
 710
 711         spin_lock_irqsave(&ci->lock, flags);
 712         ci->gadget.speed = USB_SPEED_UNKNOWN;
 713         ci->remote_wakeup = 0;
 714         ci->suspended = 0;
 715         spin_unlock_irqrestore(&ci->lock, flags);
 716
 717         /* flush all endpoints */
 718         gadget_for_each_ep(ep, gadget) {
 719                 usb_ep_fifo_flush(ep);
 720         }
 721         usb_ep_fifo_flush(&ci->ep0out->ep);
 722         usb_ep_fifo_flush(&ci->ep0in->ep);
 723
 724         /* make sure to disable all endpoints */
 725         gadget_for_each_ep(ep, gadget) {
 726                 usb_ep_disable(ep);
 727         }
 728
 729         if (ci->status != NULL) {
 730                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 731                 ci->status = NULL;
 732         }
 733
 734         return 0;
 735 }
 736
 737 /******************************************************************************
 738  * ISR block
 739  *****************************************************************************/
 740 /**
 741  * isr_reset_handler: USB reset interrupt handler
 742  * @ci: UDC device
 743  *
 744  * This function resets USB engine after a bus reset occurred
 745  */
 746 static void isr_reset_handler(struct ci_hdrc *ci)
 747 __releases(ci->lock)
 748 __acquires(ci->lock)
 749 {
 750         int retval;
 751
 752         spin_unlock(&ci->lock);
 753         if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 754                 usb_gadget_udc_reset(&ci->gadget, ci->driver);
 755
 756         retval = _gadget_stop_activity(&ci->gadget);
 757         if (retval)
 758                 goto done;
 759
 760         retval = hw_usb_reset(ci);
 761         if (retval)
 762                 goto done;
 763
 764         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 765         if (ci->status == NULL)
 766                 retval = -ENOMEM;
 767
 768 done:
 769         spin_lock(&ci->lock);
 770
 771         if (retval)
 772                 dev_err(ci->dev, "error: %i\n", retval);
 773 }
 774
 775 /**
 776  * isr_get_status_complete: get_status request complete function
 777  * @ep:  endpoint
 778  * @req: request handled
 779  *
 780  * Caller must release lock
 781  */
 782 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 783 {
 784         if (ep == NULL || req == NULL)
 785                 return;
 786
 787         kfree(req->buf);
 788         usb_ep_free_request(ep, req);
 789 }
 790
 791 /**
 792  * _ep_queue: queues (submits) an I/O request to an endpoint
 793  * @ep:        endpoint
 794  * @req:       request
 795  * @gfp_flags: GFP flags (not used)
 796  *
 797  * Caller must hold lock
 798  * This function returns an error code
 799  */
 800 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 801                     gfp_t __maybe_unused gfp_flags)
 802 {
 803         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 804         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 805         struct ci_hdrc *ci = hwep->ci;
 806         int retval = 0;
 807
 808         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 809                 return -EINVAL;
 810
 811         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 812                 if (req->length)
 813                         hwep = (ci->ep0_dir == RX) ?
 814                                ci->ep0out : ci->ep0in;
 815                 if (!list_empty(&hwep->qh.queue)) {
 816                         _ep_nuke(hwep);
 817                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 818                                  _usb_addr(hwep));
 819                 }
 820         }
 821
 822         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 823             hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
 824                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 825                 return -EMSGSIZE;
 826         }
 827
 828         /* first nuke then test link, e.g. previous status has not sent */
 829         if (!list_empty(&hwreq->queue)) {
 830                 dev_err(hwep->ci->dev, "request already in queue\n");
 831                 return -EBUSY;
 832         }
 833
 834         /* push request */
 835         hwreq->req.status = -EINPROGRESS;
 836         hwreq->req.actual = 0;
 837
 838         retval = _hardware_enqueue(hwep, hwreq);
 839
 840         if (retval == -EALREADY)
 841                 retval = 0;
 842         if (!retval)
 843                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
 844
 845         return retval;
 846 }
 847
 848 /**
 849  * isr_get_status_response: get_status request response
 850  * @ci: ci struct
 851  * @setup: setup request packet
 852  *
 853  * This function returns an error code
 854  */
 855 static int isr_get_status_response(struct ci_hdrc *ci,
 856                                    struct usb_ctrlrequest *setup)
 857 __releases(hwep->lock)
 858 __acquires(hwep->lock)
 859 {
 860         struct ci_hw_ep *hwep = ci->ep0in;
 861         struct usb_request *req = NULL;
 862         gfp_t gfp_flags = GFP_ATOMIC;
 863         int dir, num, retval;
 864
 865         if (hwep == NULL || setup == NULL)
 866                 return -EINVAL;
 867
 868         spin_unlock(hwep->lock);
 869         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 870         spin_lock(hwep->lock);
 871         if (req == NULL)
 872                 return -ENOMEM;
 873
 874         req->complete = isr_get_status_complete;
 875         req->length   = 2;
 876         req->buf      = kzalloc(req->length, gfp_flags);
 877         if (req->buf == NULL) {
 878                 retval = -ENOMEM;
 879                 goto err_free_req;
 880         }
 881
 882         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
 883                 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
 884                         ci->gadget.is_selfpowered;
 885         } else if ((setup->bRequestType & USB_RECIP_MASK) \
 886                    == USB_RECIP_ENDPOINT) {
 887                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
 888                         TX : RX;
 889                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 890                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
 891         }
 892         /* else do nothing; reserved for future use */
 893
 894         retval = _ep_queue(&hwep->ep, req, gfp_flags);
 895         if (retval)
 896                 goto err_free_buf;
 897
 898         return 0;
 899
 900  err_free_buf:
 901         kfree(req->buf);
 902  err_free_req:
 903         spin_unlock(hwep->lock);
 904         usb_ep_free_request(&hwep->ep, req);
 905         spin_lock(hwep->lock);
 906         return retval;
 907 }
 908
 909 /**
 910  * isr_setup_status_complete: setup_status request complete function
 911  * @ep:  endpoint
 912  * @req: request handled
 913  *
 914  * Caller must release lock. Put the port in test mode if test mode
 915  * feature is selected.
 916  */
 917 static void
 918 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
 919 {
 920         struct ci_hdrc *ci = req->context;
 921         unsigned long flags;
 922
 923         if (ci->setaddr) {
 924                 hw_usb_set_address(ci, ci->address);
 925                 ci->setaddr = false;
 926                 if (ci->address)
 927                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
 928         }
 929
 930         spin_lock_irqsave(&ci->lock, flags);
 931         if (ci->test_mode)
 932                 hw_port_test_set(ci, ci->test_mode);
 933         spin_unlock_irqrestore(&ci->lock, flags);
 934 }
 935
 936 /**
 937  * isr_setup_status_phase: queues the status phase of a setup transation
 938  * @ci: ci struct
 939  *
 940  * This function returns an error code
 941  */
 942 static int isr_setup_status_phase(struct ci_hdrc *ci)
 943 {
 944         struct ci_hw_ep *hwep;
 945
 946         /*
 947          * Unexpected USB controller behavior, caused by bad signal integrity
 948          * or ground reference problems, can lead to isr_setup_status_phase
 949          * being called with ci->status equal to NULL.
 950          * If this situation occurs, you should review your USB hardware design.
 951          */
 952         if (WARN_ON_ONCE(!ci->status))
 953                 return -EPIPE;
 954
 955         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
 956         ci->status->context = ci;
 957         ci->status->complete = isr_setup_status_complete;
 958
 959         return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
 960 }
 961
 962 /**
 963  * isr_tr_complete_low: transaction complete low level handler
 964  * @hwep: endpoint
 965  *
 966  * This function returns an error code
 967  * Caller must hold lock
 968  */
 969 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
 970 __releases(hwep->lock)
 971 __acquires(hwep->lock)
 972 {
 973         struct ci_hw_req *hwreq, *hwreqtemp;
 974         struct ci_hw_ep *hweptemp = hwep;
 975         int retval = 0;
 976
 977         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
 978                         queue) {
 979                 retval = _hardware_dequeue(hwep, hwreq);
 980                 if (retval < 0)
 981                         break;
 982                 list_del_init(&hwreq->queue);
 983                 if (hwreq->req.complete != NULL) {
 984                         spin_unlock(hwep->lock);
 985                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
 986                                         hwreq->req.length)
 987                                 hweptemp = hwep->ci->ep0in;
 988                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
 989                         spin_lock(hwep->lock);
 990                 }
 991         }
 992
 993         if (retval == -EBUSY)
 994                 retval = 0;
 995
 996         return retval;
 997 }
 998
 999 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1000 {
1001         dev_warn(&ci->gadget.dev,
1002                 "connect the device to an alternate port if you want HNP\n");
1003         return isr_setup_status_phase(ci);
1004 }
1005
1006 /**
1007  * isr_setup_packet_handler: setup packet handler
1008  * @ci: UDC descriptor
1009  *
1010  * This function handles setup packet
1011  */
1012 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1013 __releases(ci->lock)
1014 __acquires(ci->lock)
1015 {
1016         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1017         struct usb_ctrlrequest req;
1018         int type, num, dir, err = -EINVAL;
1019         u8 tmode = 0;
1020
1021         /*
1022          * Flush data and handshake transactions of previous
1023          * setup packet.
1024          */
1025         _ep_nuke(ci->ep0out);
1026         _ep_nuke(ci->ep0in);
1027
1028         /* read_setup_packet */
1029         do {
1030                 hw_test_and_set_setup_guard(ci);
1031                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1032         } while (!hw_test_and_clear_setup_guard(ci));
1033
1034         type = req.bRequestType;
1035
1036         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1037
1038         switch (req.bRequest) {
1039         case USB_REQ_CLEAR_FEATURE:
1040                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1041                                 le16_to_cpu(req.wValue) ==
1042                                 USB_ENDPOINT_HALT) {
1043                         if (req.wLength != 0)
1044                                 break;
1045                         num  = le16_to_cpu(req.wIndex);
1046                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1047                         num &= USB_ENDPOINT_NUMBER_MASK;
1048                         if (dir == TX)
1049                                 num += ci->hw_ep_max / 2;
1050                         if (!ci->ci_hw_ep[num].wedge) {
1051                                 spin_unlock(&ci->lock);
1052                                 err = usb_ep_clear_halt(
1053                                         &ci->ci_hw_ep[num].ep);
1054                                 spin_lock(&ci->lock);
1055                                 if (err)
1056                                         break;
1057                         }
1058                         err = isr_setup_status_phase(ci);
1059                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1060                                 le16_to_cpu(req.wValue) ==
1061                                 USB_DEVICE_REMOTE_WAKEUP) {
1062                         if (req.wLength != 0)
1063                                 break;
1064                         ci->remote_wakeup = 0;
1065                         err = isr_setup_status_phase(ci);
1066                 } else {
1067                         goto delegate;
1068                 }
1069                 break;
1070         case USB_REQ_GET_STATUS:
1071                 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1072                         le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1073                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1074                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1075                         goto delegate;
1076                 if (le16_to_cpu(req.wLength) != 2 ||
1077                     le16_to_cpu(req.wValue)  != 0)
1078                         break;
1079                 err = isr_get_status_response(ci, &req);
1080                 break;
1081         case USB_REQ_SET_ADDRESS:
1082                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1083                         goto delegate;
1084                 if (le16_to_cpu(req.wLength) != 0 ||
1085                     le16_to_cpu(req.wIndex)  != 0)
1086                         break;
1087                 ci->address = (u8)le16_to_cpu(req.wValue);
1088                 ci->setaddr = true;
1089                 err = isr_setup_status_phase(ci);
1090                 break;
1091         case USB_REQ_SET_FEATURE:
1092                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1093                                 le16_to_cpu(req.wValue) ==
1094                                 USB_ENDPOINT_HALT) {
1095                         if (req.wLength != 0)
1096                                 break;
1097                         num  = le16_to_cpu(req.wIndex);
1098                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1099                         num &= USB_ENDPOINT_NUMBER_MASK;
1100                         if (dir == TX)
1101                                 num += ci->hw_ep_max / 2;
1102
1103                         spin_unlock(&ci->lock);
1104                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1105                         spin_lock(&ci->lock);
1106                         if (!err)
1107                                 isr_setup_status_phase(ci);
1108                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1109                         if (req.wLength != 0)
1110                                 break;
1111                         switch (le16_to_cpu(req.wValue)) {
1112                         case USB_DEVICE_REMOTE_WAKEUP:
1113                                 ci->remote_wakeup = 1;
1114                                 err = isr_setup_status_phase(ci);
1115                                 break;
1116                         case USB_DEVICE_TEST_MODE:
1117                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1118                                 switch (tmode) {
1119                                 case TEST_J:
1120                                 case TEST_K:
1121                                 case TEST_SE0_NAK:
1122                                 case TEST_PACKET:
1123                                 case TEST_FORCE_EN:
1124                                         ci->test_mode = tmode;
1125                                         err = isr_setup_status_phase(
1126                                                         ci);
1127                                         break;
1128                                 default:
1129                                         break;
1130                                 }
1131                                 break;
1132                         case USB_DEVICE_B_HNP_ENABLE:
1133                                 if (ci_otg_is_fsm_mode(ci)) {
1134                                         ci->gadget.b_hnp_enable = 1;
1135                                         err = isr_setup_status_phase(
1136                                                         ci);
1137                                 }
1138                                 break;
1139                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1140                                 if (ci_otg_is_fsm_mode(ci))
1141                                         err = otg_a_alt_hnp_support(ci);
1142                                 break;
1143                         case USB_DEVICE_A_HNP_SUPPORT:
1144                                 if (ci_otg_is_fsm_mode(ci)) {
1145                                         ci->gadget.a_hnp_support = 1;
1146                                         err = isr_setup_status_phase(
1147                                                         ci);
1148                                 }
1149                                 break;
1150                         default:
1151                                 goto delegate;
1152                         }
1153                 } else {
1154                         goto delegate;
1155                 }
1156                 break;
1157         default:
1158 delegate:
1159                 if (req.wLength == 0)   /* no data phase */
1160                         ci->ep0_dir = TX;
1161
1162                 spin_unlock(&ci->lock);
1163                 err = ci->driver->setup(&ci->gadget, &req);
1164                 spin_lock(&ci->lock);
1165                 break;
1166         }
1167
1168         if (err < 0) {
1169                 spin_unlock(&ci->lock);
1170                 if (_ep_set_halt(&hwep->ep, 1, false))
1171                         dev_err(ci->dev, "error: _ep_set_halt\n");
1172                 spin_lock(&ci->lock);
1173         }
1174 }
1175
1176 /**
1177  * isr_tr_complete_handler: transaction complete interrupt handler
1178  * @ci: UDC descriptor
1179  *
1180  * This function handles traffic events
1181  */
1182 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1183 __releases(ci->lock)
1184 __acquires(ci->lock)
1185 {
1186         unsigned i;
1187         int err;
1188
1189         for (i = 0; i < ci->hw_ep_max; i++) {
1190                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1191
1192                 if (hwep->ep.desc == NULL)
1193                         continue;   /* not configured */
1194
1195                 if (hw_test_and_clear_complete(ci, i)) {
1196                         err = isr_tr_complete_low(hwep);
1197                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1198                                 if (err > 0)   /* needs status phase */
1199                                         err = isr_setup_status_phase(ci);
1200                                 if (err < 0) {
1201                                         spin_unlock(&ci->lock);
1202                                         if (_ep_set_halt(&hwep->ep, 1, false))
1203                                                 dev_err(ci->dev,
1204                                                 "error: _ep_set_halt\n");
1205                                         spin_lock(&ci->lock);
1206                                 }
1207                         }
1208                 }
1209
1210                 /* Only handle setup packet below */
1211                 if (i == 0 &&
1212                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1213                         isr_setup_packet_handler(ci);
1214         }
1215 }
1216
1217 /******************************************************************************
1218  * ENDPT block
1219  *****************************************************************************/
1220 /**
1221  * ep_enable: configure endpoint, making it usable
1222  *
1223  * Check usb_ep_enable() at "usb_gadget.h" for details
1224  */
1225 static int ep_enable(struct usb_ep *ep,
1226                      const struct usb_endpoint_descriptor *desc)
1227 {
1228         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1229         int retval = 0;
1230         unsigned long flags;
1231         u32 cap = 0;
1232
1233         if (ep == NULL || desc == NULL)
1234                 return -EINVAL;
1235
1236         spin_lock_irqsave(hwep->lock, flags);
1237
1238         /* only internal SW should enable ctrl endpts */
1239
1240         if (!list_empty(&hwep->qh.queue)) {
1241                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1242                 spin_unlock_irqrestore(hwep->lock, flags);
1243                 return -EBUSY;
1244         }
1245
1246         hwep->ep.desc = desc;
1247
1248         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1249         hwep->num  = usb_endpoint_num(desc);
1250         hwep->type = usb_endpoint_type(desc);
1251
1252         hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1253         hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1254
1255         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1256                 cap |= QH_IOS;
1257
1258         cap |= QH_ZLT;
1259         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1260         /*
1261          * For ISO-TX, we set mult at QH as the largest value, and use
1262          * MultO at TD as real mult value.
1263          */
1264         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1265                 cap |= 3 << __ffs(QH_MULT);
1266
1267         hwep->qh.ptr->cap = cpu_to_le32(cap);
1268
1269         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1270
1271         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1272                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1273                 retval = -EINVAL;
1274         }
1275
1276         /*
1277          * Enable endpoints in the HW other than ep0 as ep0
1278          * is always enabled
1279          */
1280         if (hwep->num)
1281                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1282                                        hwep->type);
1283
1284         spin_unlock_irqrestore(hwep->lock, flags);
1285         return retval;
1286 }
1287
1288 /**
1289  * ep_disable: endpoint is no longer usable
1290  *
1291  * Check usb_ep_disable() at "usb_gadget.h" for details
1292  */
1293 static int ep_disable(struct usb_ep *ep)
1294 {
1295         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1296         int direction, retval = 0;
1297         unsigned long flags;
1298
1299         if (ep == NULL)
1300                 return -EINVAL;
1301         else if (hwep->ep.desc == NULL)
1302                 return -EBUSY;
1303
1304         spin_lock_irqsave(hwep->lock, flags);
1305
1306         /* only internal SW should disable ctrl endpts */
1307
1308         direction = hwep->dir;
1309         do {
1310                 retval |= _ep_nuke(hwep);
1311                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1312
1313                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1314                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1315
1316         } while (hwep->dir != direction);
1317
1318         hwep->ep.desc = NULL;
1319
1320         spin_unlock_irqrestore(hwep->lock, flags);
1321         return retval;
1322 }
1323
1324 /**
1325  * ep_alloc_request: allocate a request object to use with this endpoint
1326  *
1327  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1328  */
1329 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1330 {
1331         struct ci_hw_req *hwreq = NULL;
1332
1333         if (ep == NULL)
1334                 return NULL;
1335
1336         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1337         if (hwreq != NULL) {
1338                 INIT_LIST_HEAD(&hwreq->queue);
1339                 INIT_LIST_HEAD(&hwreq->tds);
1340         }
1341
1342         return (hwreq == NULL) ? NULL : &hwreq->req;
1343 }
1344
1345 /**
1346  * ep_free_request: frees a request object
1347  *
1348  * Check usb_ep_free_request() at "usb_gadget.h" for details
1349  */
1350 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1351 {
1352         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1353         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1354         struct td_node *node, *tmpnode;
1355         unsigned long flags;
1356
1357         if (ep == NULL || req == NULL) {
1358                 return;
1359         } else if (!list_empty(&hwreq->queue)) {
1360                 dev_err(hwep->ci->dev, "freeing queued request\n");
1361                 return;
1362         }
1363
1364         spin_lock_irqsave(hwep->lock, flags);
1365
1366         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1367                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1368                 list_del_init(&node->td);
1369                 node->ptr = NULL;
1370                 kfree(node);
1371         }
1372
1373         kfree(hwreq);
1374
1375         spin_unlock_irqrestore(hwep->lock, flags);
1376 }
1377
1378 /**
1379  * ep_queue: queues (submits) an I/O request to an endpoint
1380  *
1381  * Check usb_ep_queue()* at usb_gadget.h" for details
1382  */
1383 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1384                     gfp_t __maybe_unused gfp_flags)
1385 {
1386         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1387         int retval = 0;
1388         unsigned long flags;
1389
1390         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1391                 return -EINVAL;
1392
1393         spin_lock_irqsave(hwep->lock, flags);
1394         retval = _ep_queue(ep, req, gfp_flags);
1395         spin_unlock_irqrestore(hwep->lock, flags);
1396         return retval;
1397 }
1398
1399 /**
1400  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1401  *
1402  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1403  */
1404 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1405 {
1406         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1407         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1408         unsigned long flags;
1409         struct td_node *node, *tmpnode;
1410
1411         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1412                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1413                 list_empty(&hwep->qh.queue))
1414                 return -EINVAL;
1415
1416         spin_lock_irqsave(hwep->lock, flags);
1417
1418         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1419
1420         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1421                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1422                 list_del(&node->td);
1423                 kfree(node);
1424         }
1425
1426         /* pop request */
1427         list_del_init(&hwreq->queue);
1428
1429         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1430
1431         req->status = -ECONNRESET;
1432
1433         if (hwreq->req.complete != NULL) {
1434                 spin_unlock(hwep->lock);
1435                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1436                 spin_lock(hwep->lock);
1437         }
1438
1439         spin_unlock_irqrestore(hwep->lock, flags);
1440         return 0;
1441 }
1442
1443 /**
1444  * ep_set_halt: sets the endpoint halt feature
1445  *
1446  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1447  */
1448 static int ep_set_halt(struct usb_ep *ep, int value)
1449 {
1450         return _ep_set_halt(ep, value, true);
1451 }
1452
1453 /**
1454  * ep_set_wedge: sets the halt feature and ignores clear requests
1455  *
1456  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1457  */
1458 static int ep_set_wedge(struct usb_ep *ep)
1459 {
1460         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1461         unsigned long flags;
1462
1463         if (ep == NULL || hwep->ep.desc == NULL)
1464                 return -EINVAL;
1465
1466         spin_lock_irqsave(hwep->lock, flags);
1467         hwep->wedge = 1;
1468         spin_unlock_irqrestore(hwep->lock, flags);
1469
1470         return usb_ep_set_halt(ep);
1471 }
1472
1473 /**
1474  * ep_fifo_flush: flushes contents of a fifo
1475  *
1476  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1477  */
1478 static void ep_fifo_flush(struct usb_ep *ep)
1479 {
1480         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1481         unsigned long flags;
1482
1483         if (ep == NULL) {
1484                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1485                 return;
1486         }
1487
1488         spin_lock_irqsave(hwep->lock, flags);
1489
1490         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1491
1492         spin_unlock_irqrestore(hwep->lock, flags);
1493 }
1494
1495 /**
1496  * Endpoint-specific part of the API to the USB controller hardware
1497  * Check "usb_gadget.h" for details
1498  */
1499 static const struct usb_ep_ops usb_ep_ops = {
1500         .enable        = ep_enable,
1501         .disable       = ep_disable,
1502         .alloc_request = ep_alloc_request,
1503         .free_request  = ep_free_request,
1504         .queue         = ep_queue,
1505         .dequeue       = ep_dequeue,
1506         .set_halt      = ep_set_halt,
1507         .set_wedge     = ep_set_wedge,
1508         .fifo_flush    = ep_fifo_flush,
1509 };
1510
1511 /******************************************************************************
1512  * GADGET block
1513  *****************************************************************************/
1514 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1515 {
1516         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1517         unsigned long flags;
1518         int gadget_ready = 0;
1519
1520         spin_lock_irqsave(&ci->lock, flags);
1521         ci->vbus_active = is_active;
1522         if (ci->driver)
1523                 gadget_ready = 1;
1524         spin_unlock_irqrestore(&ci->lock, flags);
1525
1526         if (ci->usb_phy)
1527                 usb_phy_set_charger_state(ci->usb_phy, is_active ?
1528                         USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
1529
1530         if (gadget_ready) {
1531                 if (is_active) {
1532                         pm_runtime_get_sync(&_gadget->dev);
1533                         hw_device_reset(ci);
1534                         hw_device_state(ci, ci->ep0out->qh.dma);
1535                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1536                         usb_udc_vbus_handler(_gadget, true);
1537                 } else {
1538                         usb_udc_vbus_handler(_gadget, false);
1539                         if (ci->driver)
1540                                 ci->driver->disconnect(&ci->gadget);
1541                         hw_device_state(ci, 0);
1542                         if (ci->platdata->notify_event)
1543                                 ci->platdata->notify_event(ci,
1544                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1545                         _gadget_stop_activity(&ci->gadget);
1546                         pm_runtime_put_sync(&_gadget->dev);
1547                         usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1548                 }
1549         }
1550
1551         return 0;
1552 }
1553
1554 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1555 {
1556         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1557         unsigned long flags;
1558         int ret = 0;
1559
1560         spin_lock_irqsave(&ci->lock, flags);
1561         if (!ci->remote_wakeup) {
1562                 ret = -EOPNOTSUPP;
1563                 goto out;
1564         }
1565         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1566                 ret = -EINVAL;
1567                 goto out;
1568         }
1569         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1570 out:
1571         spin_unlock_irqrestore(&ci->lock, flags);
1572         return ret;
1573 }
1574
1575 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1576 {
1577         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1578
1579         if (ci->usb_phy)
1580                 return usb_phy_set_power(ci->usb_phy, ma);
1581         return -ENOTSUPP;
1582 }
1583
1584 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1585 {
1586         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1587         struct ci_hw_ep *hwep = ci->ep0in;
1588         unsigned long flags;
1589
1590         spin_lock_irqsave(hwep->lock, flags);
1591         _gadget->is_selfpowered = (is_on != 0);
1592         spin_unlock_irqrestore(hwep->lock, flags);
1593
1594         return 0;
1595 }
1596
1597 /* Change Data+ pullup status
1598  * this func is used by usb_gadget_connect/disconnet
1599  */
1600 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1601 {
1602         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1603
1604         /*
1605          * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1606          * and don't touch Data+ in host mode for dual role config.
1607          */
1608         if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1609                 return 0;
1610
1611         pm_runtime_get_sync(&ci->gadget.dev);
1612         if (is_on)
1613                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1614         else
1615                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1616         pm_runtime_put_sync(&ci->gadget.dev);
1617
1618         return 0;
1619 }
1620
1621 static int ci_udc_start(struct usb_gadget *gadget,
1622                          struct usb_gadget_driver *driver);
1623 static int ci_udc_stop(struct usb_gadget *gadget);
1624 /**
1625  * Device operations part of the API to the USB controller hardware,
1626  * which don't involve endpoints (or i/o)
1627  * Check  "usb_gadget.h" for details
1628  */
1629 static const struct usb_gadget_ops usb_gadget_ops = {
1630         .vbus_session   = ci_udc_vbus_session,
1631         .wakeup         = ci_udc_wakeup,
1632         .set_selfpowered        = ci_udc_selfpowered,
1633         .pullup         = ci_udc_pullup,
1634         .vbus_draw      = ci_udc_vbus_draw,
1635         .udc_start      = ci_udc_start,
1636         .udc_stop       = ci_udc_stop,
1637 };
1638
1639 static int init_eps(struct ci_hdrc *ci)
1640 {
1641         int retval = 0, i, j;
1642
1643         for (i = 0; i < ci->hw_ep_max/2; i++)
1644                 for (j = RX; j <= TX; j++) {
1645                         int k = i + j * ci->hw_ep_max/2;
1646                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1647
1648                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1649                                         (j == TX)  ? "in" : "out");
1650
1651                         hwep->ci          = ci;
1652                         hwep->lock         = &ci->lock;
1653                         hwep->td_pool      = ci->td_pool;
1654
1655                         hwep->ep.name      = hwep->name;
1656                         hwep->ep.ops       = &usb_ep_ops;
1657
1658                         if (i == 0) {
1659                                 hwep->ep.caps.type_control = true;
1660                         } else {
1661                                 hwep->ep.caps.type_iso = true;
1662                                 hwep->ep.caps.type_bulk = true;
1663                                 hwep->ep.caps.type_int = true;
1664                         }
1665
1666                         if (j == TX)
1667                                 hwep->ep.caps.dir_in = true;
1668                         else
1669                                 hwep->ep.caps.dir_out = true;
1670
1671                         /*
1672                          * for ep0: maxP defined in desc, for other
1673                          * eps, maxP is set by epautoconfig() called
1674                          * by gadget layer
1675                          */
1676                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1677
1678                         INIT_LIST_HEAD(&hwep->qh.queue);
1679                         hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1680                                                        &hwep->qh.dma);
1681                         if (hwep->qh.ptr == NULL)
1682                                 retval = -ENOMEM;
1683
1684                         /*
1685                          * set up shorthands for ep0 out and in endpoints,
1686                          * don't add to gadget's ep_list
1687                          */
1688                         if (i == 0) {
1689                                 if (j == RX)
1690                                         ci->ep0out = hwep;
1691                                 else
1692                                         ci->ep0in = hwep;
1693
1694                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1695                                 continue;
1696                         }
1697
1698                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1699                 }
1700
1701         return retval;
1702 }
1703
1704 static void destroy_eps(struct ci_hdrc *ci)
1705 {
1706         int i;
1707
1708         for (i = 0; i < ci->hw_ep_max; i++) {
1709                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1710
1711                 if (hwep->pending_td)
1712                         free_pending_td(hwep);
1713                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1714         }
1715 }
1716
1717 /**
1718  * ci_udc_start: register a gadget driver
1719  * @gadget: our gadget
1720  * @driver: the driver being registered
1721  *
1722  * Interrupts are enabled here.
1723  */
1724 static int ci_udc_start(struct usb_gadget *gadget,
1725                          struct usb_gadget_driver *driver)
1726 {
1727         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1728         int retval = -ENOMEM;
1729
1730         if (driver->disconnect == NULL)
1731                 return -EINVAL;
1732
1733
1734         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1735         retval = usb_ep_enable(&ci->ep0out->ep);
1736         if (retval)
1737                 return retval;
1738
1739         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1740         retval = usb_ep_enable(&ci->ep0in->ep);
1741         if (retval)
1742                 return retval;
1743
1744         ci->driver = driver;
1745
1746         /* Start otg fsm for B-device */
1747         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1748                 ci_hdrc_otg_fsm_start(ci);
1749                 return retval;
1750         }
1751
1752         pm_runtime_get_sync(&ci->gadget.dev);
1753         if (ci->vbus_active) {
1754                 hw_device_reset(ci);
1755         } else {
1756                 usb_udc_vbus_handler(&ci->gadget, false);
1757                 pm_runtime_put_sync(&ci->gadget.dev);
1758                 return retval;
1759         }
1760
1761         retval = hw_device_state(ci, ci->ep0out->qh.dma);
1762         if (retval)
1763                 pm_runtime_put_sync(&ci->gadget.dev);
1764
1765         return retval;
1766 }
1767
1768 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1769 {
1770         if (!ci_otg_is_fsm_mode(ci))
1771                 return;
1772
1773         mutex_lock(&ci->fsm.lock);
1774         if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1775                 ci->fsm.a_bidl_adis_tmout = 1;
1776                 ci_hdrc_otg_fsm_start(ci);
1777         } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1778                 ci->fsm.protocol = PROTO_UNDEF;
1779                 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1780         }
1781         mutex_unlock(&ci->fsm.lock);
1782 }
1783
1784 /**
1785  * ci_udc_stop: unregister a gadget driver
1786  */
1787 static int ci_udc_stop(struct usb_gadget *gadget)
1788 {
1789         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1790         unsigned long flags;
1791
1792         spin_lock_irqsave(&ci->lock, flags);
1793
1794         if (ci->vbus_active) {
1795                 hw_device_state(ci, 0);
1796                 spin_unlock_irqrestore(&ci->lock, flags);
1797                 if (ci->platdata->notify_event)
1798                         ci->platdata->notify_event(ci,
1799                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1800                 _gadget_stop_activity(&ci->gadget);
1801                 spin_lock_irqsave(&ci->lock, flags);
1802                 pm_runtime_put(&ci->gadget.dev);
1803         }
1804
1805         ci->driver = NULL;
1806         spin_unlock_irqrestore(&ci->lock, flags);
1807
1808         ci_udc_stop_for_otg_fsm(ci);
1809         return 0;
1810 }
1811
1812 /******************************************************************************
1813  * BUS block
1814  *****************************************************************************/
1815 /**
1816  * udc_irq: ci interrupt handler
1817  *
1818  * This function returns IRQ_HANDLED if the IRQ has been handled
1819  * It locks access to registers
1820  */
1821 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1822 {
1823         irqreturn_t retval;
1824         u32 intr;
1825
1826         if (ci == NULL)
1827                 return IRQ_HANDLED;
1828
1829         spin_lock(&ci->lock);
1830
1831         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1832                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1833                                 USBMODE_CM_DC) {
1834                         spin_unlock(&ci->lock);
1835                         return IRQ_NONE;
1836                 }
1837         }
1838         intr = hw_test_and_clear_intr_active(ci);
1839
1840         if (intr) {
1841                 /* order defines priority - do NOT change it */
1842                 if (USBi_URI & intr)
1843                         isr_reset_handler(ci);
1844
1845                 if (USBi_PCI & intr) {
1846                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
1847                                 USB_SPEED_HIGH : USB_SPEED_FULL;
1848                         if (ci->suspended) {
1849                                 if (ci->driver->resume) {
1850                                         spin_unlock(&ci->lock);
1851                                         ci->driver->resume(&ci->gadget);
1852                                         spin_lock(&ci->lock);
1853                                 }
1854                                 ci->suspended = 0;
1855                                 usb_gadget_set_state(&ci->gadget,
1856                                                 ci->resume_state);
1857                         }
1858                 }
1859
1860                 if (USBi_UI  & intr)
1861                         isr_tr_complete_handler(ci);
1862
1863                 if ((USBi_SLI & intr) && !(ci->suspended)) {
1864                         ci->suspended = 1;
1865                         ci->resume_state = ci->gadget.state;
1866                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1867                             ci->driver->suspend) {
1868                                 spin_unlock(&ci->lock);
1869                                 ci->driver->suspend(&ci->gadget);
1870                                 spin_lock(&ci->lock);
1871                         }
1872                         usb_gadget_set_state(&ci->gadget,
1873                                         USB_STATE_SUSPENDED);
1874                 }
1875                 retval = IRQ_HANDLED;
1876         } else {
1877                 retval = IRQ_NONE;
1878         }
1879         spin_unlock(&ci->lock);
1880
1881         return retval;
1882 }
1883
1884 /**
1885  * udc_start: initialize gadget role
1886  * @ci: chipidea controller
1887  */
1888 static int udc_start(struct ci_hdrc *ci)
1889 {
1890         struct device *dev = ci->dev;
1891         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1892         int retval = 0;
1893
1894         ci->gadget.ops          = &usb_gadget_ops;
1895         ci->gadget.speed        = USB_SPEED_UNKNOWN;
1896         ci->gadget.max_speed    = USB_SPEED_HIGH;
1897         ci->gadget.name         = ci->platdata->name;
1898         ci->gadget.otg_caps     = otg_caps;
1899
1900         if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
1901                 ci->gadget.quirk_avoids_skb_reserve = 1;
1902
1903         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1904                                                 otg_caps->adp_support))
1905                 ci->gadget.is_otg = 1;
1906
1907         INIT_LIST_HEAD(&ci->gadget.ep_list);
1908
1909         /* alloc resources */
1910         ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
1911                                        sizeof(struct ci_hw_qh),
1912                                        64, CI_HDRC_PAGE_SIZE);
1913         if (ci->qh_pool == NULL)
1914                 return -ENOMEM;
1915
1916         ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
1917                                        sizeof(struct ci_hw_td),
1918                                        64, CI_HDRC_PAGE_SIZE);
1919         if (ci->td_pool == NULL) {
1920                 retval = -ENOMEM;
1921                 goto free_qh_pool;
1922         }
1923
1924         retval = init_eps(ci);
1925         if (retval)
1926                 goto free_pools;
1927
1928         ci->gadget.ep0 = &ci->ep0in->ep;
1929
1930         retval = usb_add_gadget_udc(dev, &ci->gadget);
1931         if (retval)
1932                 goto destroy_eps;
1933
1934         pm_runtime_no_callbacks(&ci->gadget.dev);
1935         pm_runtime_enable(&ci->gadget.dev);
1936
1937         return retval;
1938
1939 destroy_eps:
1940         destroy_eps(ci);
1941 free_pools:
1942         dma_pool_destroy(ci->td_pool);
1943 free_qh_pool:
1944         dma_pool_destroy(ci->qh_pool);
1945         return retval;
1946 }
1947
1948 /**
1949  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1950  *
1951  * No interrupts active, the IRQ has been released
1952  */
1953 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1954 {
1955         if (!ci->roles[CI_ROLE_GADGET])
1956                 return;
1957
1958         usb_del_gadget_udc(&ci->gadget);
1959
1960         destroy_eps(ci);
1961
1962         dma_pool_destroy(ci->td_pool);
1963         dma_pool_destroy(ci->qh_pool);
1964 }
1965
1966 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1967 {
1968         if (ci->is_otg)
1969                 /* Clear and enable BSV irq */
1970                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1971                                         OTGSC_BSVIS | OTGSC_BSVIE);
1972
1973         return 0;
1974 }
1975
1976 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1977 {
1978         /*
1979          * host doesn't care B_SESSION_VALID event
1980          * so clear and disbale BSV irq
1981          */
1982         if (ci->is_otg)
1983                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1984
1985         ci->vbus_active = 0;
1986 }
1987
1988 /**
1989  * ci_hdrc_gadget_init - initialize device related bits
1990  * ci: the controller
1991  *
1992  * This function initializes the gadget, if the device is "device capable".
1993  */
1994 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
1995 {
1996         struct ci_role_driver *rdrv;
1997         int ret;
1998
1999         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2000                 return -ENXIO;
2001
2002         rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2003         if (!rdrv)
2004                 return -ENOMEM;
2005
2006         rdrv->start     = udc_id_switch_for_device;
2007         rdrv->stop      = udc_id_switch_for_host;
2008         rdrv->irq       = udc_irq;
2009         rdrv->name      = "gadget";
2010
2011         ret = udc_start(ci);
2012         if (!ret)
2013                 ci->roles[CI_ROLE_GADGET] = rdrv;
2014
2015         return ret;
2016 }