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/pinctrl/consumer.h>
  19 #include <linux/usb/ch9.h>
  20 #include <linux/usb/gadget.h>
  21 #include <linux/usb/otg-fsm.h>
  22 #include <linux/usb/chipidea.h>
  23
  24 #include "ci.h"
  25 #include "udc.h"
  26 #include "bits.h"
  27 #include "otg.h"
  28 #include "otg_fsm.h"
  29
  30 /* control endpoint description */
  31 static const struct usb_endpoint_descriptor
  32 ctrl_endpt_out_desc = {
  33         .bLength         = USB_DT_ENDPOINT_SIZE,
  34         .bDescriptorType = USB_DT_ENDPOINT,
  35
  36         .bEndpointAddress = USB_DIR_OUT,
  37         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  38         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  39 };
  40
  41 static const struct usb_endpoint_descriptor
  42 ctrl_endpt_in_desc = {
  43         .bLength         = USB_DT_ENDPOINT_SIZE,
  44         .bDescriptorType = USB_DT_ENDPOINT,
  45
  46         .bEndpointAddress = USB_DIR_IN,
  47         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  48         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  49 };
  50
  51 /**
  52  * hw_ep_bit: calculates the bit number
  53  * @num: endpoint number
  54  * @dir: endpoint direction
  55  *
  56  * This function returns bit number
  57  */
  58 static inline int hw_ep_bit(int num, int dir)
  59 {
  60         return num + ((dir == TX) ? 16 : 0);
  61 }
  62
  63 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
  64 {
  65         int fill = 16 - ci->hw_ep_max / 2;
  66
  67         if (n >= ci->hw_ep_max / 2)
  68                 n += fill;
  69
  70         return n;
  71 }
  72
  73 /**
  74  * hw_device_state: enables/disables interrupts (execute without interruption)
  75  * @dma: 0 => disable, !0 => enable and set dma engine
  76  *
  77  * This function returns an error code
  78  */
  79 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
  80 {
  81         if (dma) {
  82                 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
  83                 /* interrupt, error, port change, reset, sleep/suspend */
  84                 hw_write(ci, OP_USBINTR, ~0,
  85                              USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
  86         } else {
  87                 hw_write(ci, OP_USBINTR, ~0, 0);
  88         }
  89         return 0;
  90 }
  91
  92 /**
  93  * hw_ep_flush: flush endpoint fifo (execute without interruption)
  94  * @num: endpoint number
  95  * @dir: endpoint direction
  96  *
  97  * This function returns an error code
  98  */
  99 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
 100 {
 101         int n = hw_ep_bit(num, dir);
 102
 103         do {
 104                 /* flush any pending transfer */
 105                 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
 106                 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
 107                         cpu_relax();
 108         } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
 109
 110         return 0;
 111 }
 112
 113 /**
 114  * hw_ep_disable: disables endpoint (execute without interruption)
 115  * @num: endpoint number
 116  * @dir: endpoint direction
 117  *
 118  * This function returns an error code
 119  */
 120 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
 121 {
 122         hw_write(ci, OP_ENDPTCTRL + num,
 123                  (dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 124         return 0;
 125 }
 126
 127 /**
 128  * hw_ep_enable: enables endpoint (execute without interruption)
 129  * @num:  endpoint number
 130  * @dir:  endpoint direction
 131  * @type: endpoint type
 132  *
 133  * This function returns an error code
 134  */
 135 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
 136 {
 137         u32 mask, data;
 138
 139         if (dir == TX) {
 140                 mask  = ENDPTCTRL_TXT;  /* type    */
 141                 data  = type << __ffs(mask);
 142
 143                 mask |= ENDPTCTRL_TXS;  /* unstall */
 144                 mask |= ENDPTCTRL_TXR;  /* reset data toggle */
 145                 data |= ENDPTCTRL_TXR;
 146                 mask |= ENDPTCTRL_TXE;  /* enable  */
 147                 data |= ENDPTCTRL_TXE;
 148         } else {
 149                 mask  = ENDPTCTRL_RXT;  /* type    */
 150                 data  = type << __ffs(mask);
 151
 152                 mask |= ENDPTCTRL_RXS;  /* unstall */
 153                 mask |= ENDPTCTRL_RXR;  /* reset data toggle */
 154                 data |= ENDPTCTRL_RXR;
 155                 mask |= ENDPTCTRL_RXE;  /* enable  */
 156                 data |= ENDPTCTRL_RXE;
 157         }
 158         hw_write(ci, OP_ENDPTCTRL + num, mask, data);
 159         return 0;
 160 }
 161
 162 /**
 163  * hw_ep_get_halt: return endpoint halt status
 164  * @num: endpoint number
 165  * @dir: endpoint direction
 166  *
 167  * This function returns 1 if endpoint halted
 168  */
 169 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
 170 {
 171         u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 172
 173         return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
 174 }
 175
 176 /**
 177  * hw_ep_prime: primes endpoint (execute without interruption)
 178  * @num:     endpoint number
 179  * @dir:     endpoint direction
 180  * @is_ctrl: true if control endpoint
 181  *
 182  * This function returns an error code
 183  */
 184 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
 185 {
 186         int n = hw_ep_bit(num, dir);
 187
 188         /* Synchronize before ep prime */
 189         wmb();
 190
 191         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 192                 return -EAGAIN;
 193
 194         hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
 195
 196         while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 197                 cpu_relax();
 198         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 199                 return -EAGAIN;
 200
 201         /* status shoult be tested according with manual but it doesn't work */
 202         return 0;
 203 }
 204
 205 /**
 206  * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
 207  *                 without interruption)
 208  * @num:   endpoint number
 209  * @dir:   endpoint direction
 210  * @value: true => stall, false => unstall
 211  *
 212  * This function returns an error code
 213  */
 214 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
 215 {
 216         if (value != 0 && value != 1)
 217                 return -EINVAL;
 218
 219         do {
 220                 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
 221                 u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 222                 u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
 223
 224                 /* data toggle - reserved for EP0 but it's in ESS */
 225                 hw_write(ci, reg, mask_xs|mask_xr,
 226                           value ? mask_xs : mask_xr);
 227         } while (value != hw_ep_get_halt(ci, num, dir));
 228
 229         return 0;
 230 }
 231
 232 /**
 233  * hw_is_port_high_speed: test if port is high speed
 234  *
 235  * This function returns true if high speed port
 236  */
 237 static int hw_port_is_high_speed(struct ci_hdrc *ci)
 238 {
 239         return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
 240                 hw_read(ci, OP_PORTSC, PORTSC_HSP);
 241 }
 242
 243 /**
 244  * hw_test_and_clear_complete: test & clear complete status (execute without
 245  *                             interruption)
 246  * @n: endpoint number
 247  *
 248  * This function returns complete status
 249  */
 250 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
 251 {
 252         n = ep_to_bit(ci, n);
 253         return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
 254 }
 255
 256 /**
 257  * hw_test_and_clear_intr_active: test & clear active interrupts (execute
 258  *                                without interruption)
 259  *
 260  * This function returns active interrutps
 261  */
 262 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
 263 {
 264         u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
 265
 266         hw_write(ci, OP_USBSTS, ~0, reg);
 267         return reg;
 268 }
 269
 270 /**
 271  * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
 272  *                                interruption)
 273  *
 274  * This function returns guard value
 275  */
 276 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
 277 {
 278         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
 279 }
 280
 281 /**
 282  * hw_test_and_set_setup_guard: test & set setup guard (execute without
 283  *                              interruption)
 284  *
 285  * This function returns guard value
 286  */
 287 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
 288 {
 289         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
 290 }
 291
 292 /**
 293  * hw_usb_set_address: configures USB address (execute without interruption)
 294  * @value: new USB address
 295  *
 296  * This function explicitly sets the address, without the "USBADRA" (advance)
 297  * feature, which is not supported by older versions of the controller.
 298  */
 299 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
 300 {
 301         hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
 302                  value << __ffs(DEVICEADDR_USBADR));
 303 }
 304
 305 /**
 306  * hw_usb_reset: restart device after a bus reset (execute without
 307  *               interruption)
 308  *
 309  * This function returns an error code
 310  */
 311 static int hw_usb_reset(struct ci_hdrc *ci)
 312 {
 313         hw_usb_set_address(ci, 0);
 314
 315         /* ESS flushes only at end?!? */
 316         hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
 317
 318         /* clear setup token semaphores */
 319         hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
 320
 321         /* clear complete status */
 322         hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
 323
 324         /* wait until all bits cleared */
 325         while (hw_read(ci, OP_ENDPTPRIME, ~0))
 326                 udelay(10);             /* not RTOS friendly */
 327
 328         /* reset all endpoints ? */
 329
 330         /* reset internal status and wait for further instructions
 331            no need to verify the port reset status (ESS does it) */
 332
 333         return 0;
 334 }
 335
 336 /******************************************************************************
 337  * UTIL block
 338  *****************************************************************************/
 339
 340 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 341                           unsigned length)
 342 {
 343         int i;
 344         u32 temp;
 345         struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
 346                                                   GFP_ATOMIC);
 347
 348         if (node == NULL)
 349                 return -ENOMEM;
 350
 351         node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma);
 352         if (node->ptr == NULL) {
 353                 kfree(node);
 354                 return -ENOMEM;
 355         }
 356
 357         node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
 358         node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
 359         node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
 360         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
 361                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 362
 363                 if (hwreq->req.length == 0
 364                                 || hwreq->req.length % hwep->ep.maxpacket)
 365                         mul++;
 366                 node->ptr->token |= cpu_to_le32(mul << __ffs(TD_MULTO));
 367         }
 368
 369         temp = (u32) (hwreq->req.dma + hwreq->req.actual);
 370         if (length) {
 371                 node->ptr->page[0] = cpu_to_le32(temp);
 372                 for (i = 1; i < TD_PAGE_COUNT; i++) {
 373                         u32 page = temp + i * CI_HDRC_PAGE_SIZE;
 374                         page &= ~TD_RESERVED_MASK;
 375                         node->ptr->page[i] = cpu_to_le32(page);
 376                 }
 377         }
 378
 379         hwreq->req.actual += length;
 380
 381         if (!list_empty(&hwreq->tds)) {
 382                 /* get the last entry */
 383                 lastnode = list_entry(hwreq->tds.prev,
 384                                 struct td_node, td);
 385                 lastnode->ptr->next = cpu_to_le32(node->dma);
 386         }
 387
 388         INIT_LIST_HEAD(&node->td);
 389         list_add_tail(&node->td, &hwreq->tds);
 390
 391         return 0;
 392 }
 393
 394 /**
 395  * _usb_addr: calculates endpoint address from direction & number
 396  * @ep:  endpoint
 397  */
 398 static inline u8 _usb_addr(struct ci_hw_ep *ep)
 399 {
 400         return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
 401 }
 402
 403 /**
 404  * _hardware_enqueue: configures a request at hardware level
 405  * @hwep:   endpoint
 406  * @hwreq:  request
 407  *
 408  * This function returns an error code
 409  */
 410 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 411 {
 412         struct ci_hdrc *ci = hwep->ci;
 413         int ret = 0;
 414         unsigned rest = hwreq->req.length;
 415         int pages = TD_PAGE_COUNT;
 416         struct td_node *firstnode, *lastnode;
 417
 418         /* don't queue twice */
 419         if (hwreq->req.status == -EALREADY)
 420                 return -EALREADY;
 421
 422         hwreq->req.status = -EALREADY;
 423
 424         ret = usb_gadget_map_request_by_dev(ci->dev->parent,
 425                                             &hwreq->req, hwep->dir);
 426         if (ret)
 427                 return ret;
 428
 429         /*
 430          * The first buffer could be not page aligned.
 431          * In that case we have to span into one extra td.
 432          */
 433         if (hwreq->req.dma % PAGE_SIZE)
 434                 pages--;
 435
 436         if (rest == 0) {
 437                 ret = add_td_to_list(hwep, hwreq, 0);
 438                 if (ret < 0)
 439                         goto done;
 440         }
 441
 442         while (rest > 0) {
 443                 unsigned count = min(hwreq->req.length - hwreq->req.actual,
 444                                         (unsigned)(pages * CI_HDRC_PAGE_SIZE));
 445                 ret = add_td_to_list(hwep, hwreq, count);
 446                 if (ret < 0)
 447                         goto done;
 448
 449                 rest -= count;
 450         }
 451
 452         if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
 453             && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
 454                 ret = add_td_to_list(hwep, hwreq, 0);
 455                 if (ret < 0)
 456                         goto done;
 457         }
 458
 459         firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 460
 461         lastnode = list_entry(hwreq->tds.prev,
 462                 struct td_node, td);
 463
 464         lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
 465         if (!hwreq->req.no_interrupt)
 466                 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
 467         wmb();
 468
 469         hwreq->req.actual = 0;
 470         if (!list_empty(&hwep->qh.queue)) {
 471                 struct ci_hw_req *hwreqprev;
 472                 int n = hw_ep_bit(hwep->num, hwep->dir);
 473                 int tmp_stat;
 474                 struct td_node *prevlastnode;
 475                 u32 next = firstnode->dma & TD_ADDR_MASK;
 476
 477                 hwreqprev = list_entry(hwep->qh.queue.prev,
 478                                 struct ci_hw_req, queue);
 479                 prevlastnode = list_entry(hwreqprev->tds.prev,
 480                                 struct td_node, td);
 481
 482                 prevlastnode->ptr->next = cpu_to_le32(next);
 483                 wmb();
 484                 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 485                         goto done;
 486                 do {
 487                         hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
 488                         tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
 489                 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
 490                 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
 491                 if (tmp_stat)
 492                         goto done;
 493         }
 494
 495         /*  QH configuration */
 496         hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
 497         hwep->qh.ptr->td.token &=
 498                 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
 499
 500         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
 501                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 502
 503                 if (hwreq->req.length == 0
 504                                 || hwreq->req.length % hwep->ep.maxpacket)
 505                         mul++;
 506                 hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT));
 507         }
 508
 509         ret = hw_ep_prime(ci, hwep->num, hwep->dir,
 510                            hwep->type == USB_ENDPOINT_XFER_CONTROL);
 511 done:
 512         return ret;
 513 }
 514
 515 /*
 516  * free_pending_td: remove a pending request for the endpoint
 517  * @hwep: endpoint
 518  */
 519 static void free_pending_td(struct ci_hw_ep *hwep)
 520 {
 521         struct td_node *pending = hwep->pending_td;
 522
 523         dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
 524         hwep->pending_td = NULL;
 525         kfree(pending);
 526 }
 527
 528 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
 529                                            struct td_node *node)
 530 {
 531         hwep->qh.ptr->td.next = cpu_to_le32(node->dma);
 532         hwep->qh.ptr->td.token &=
 533                 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
 534
 535         return hw_ep_prime(ci, hwep->num, hwep->dir,
 536                                 hwep->type == USB_ENDPOINT_XFER_CONTROL);
 537 }
 538
 539 /**
 540  * _hardware_dequeue: handles a request at hardware level
 541  * @gadget: gadget
 542  * @hwep:   endpoint
 543  *
 544  * This function returns an error code
 545  */
 546 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 547 {
 548         u32 tmptoken;
 549         struct td_node *node, *tmpnode;
 550         unsigned remaining_length;
 551         unsigned actual = hwreq->req.length;
 552         struct ci_hdrc *ci = hwep->ci;
 553
 554         if (hwreq->req.status != -EALREADY)
 555                 return -EINVAL;
 556
 557         hwreq->req.status = 0;
 558
 559         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 560                 tmptoken = le32_to_cpu(node->ptr->token);
 561                 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
 562                         int n = hw_ep_bit(hwep->num, hwep->dir);
 563
 564                         if (ci->rev == CI_REVISION_24)
 565                                 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 566                                         reprime_dtd(ci, hwep, node);
 567                         hwreq->req.status = -EALREADY;
 568                         return -EBUSY;
 569                 }
 570
 571                 remaining_length = (tmptoken & TD_TOTAL_BYTES);
 572                 remaining_length >>= __ffs(TD_TOTAL_BYTES);
 573                 actual -= remaining_length;
 574
 575                 hwreq->req.status = tmptoken & TD_STATUS;
 576                 if ((TD_STATUS_HALTED & hwreq->req.status)) {
 577                         hwreq->req.status = -EPIPE;
 578                         break;
 579                 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
 580                         hwreq->req.status = -EPROTO;
 581                         break;
 582                 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
 583                         hwreq->req.status = -EILSEQ;
 584                         break;
 585                 }
 586
 587                 if (remaining_length) {
 588                         if (hwep->dir == TX) {
 589                                 hwreq->req.status = -EPROTO;
 590                                 break;
 591                         }
 592                 }
 593                 /*
 594                  * As the hardware could still address the freed td
 595                  * which will run the udc unusable, the cleanup of the
 596                  * td has to be delayed by one.
 597                  */
 598                 if (hwep->pending_td)
 599                         free_pending_td(hwep);
 600
 601                 hwep->pending_td = node;
 602                 list_del_init(&node->td);
 603         }
 604
 605         usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
 606                                         &hwreq->req, hwep->dir);
 607
 608         hwreq->req.actual += actual;
 609
 610         if (hwreq->req.status)
 611                 return hwreq->req.status;
 612
 613         return hwreq->req.actual;
 614 }
 615
 616 /**
 617  * _ep_nuke: dequeues all endpoint requests
 618  * @hwep: endpoint
 619  *
 620  * This function returns an error code
 621  * Caller must hold lock
 622  */
 623 static int _ep_nuke(struct ci_hw_ep *hwep)
 624 __releases(hwep->lock)
 625 __acquires(hwep->lock)
 626 {
 627         struct td_node *node, *tmpnode;
 628         if (hwep == NULL)
 629                 return -EINVAL;
 630
 631         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
 632
 633         while (!list_empty(&hwep->qh.queue)) {
 634
 635                 /* pop oldest request */
 636                 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
 637                                                      struct ci_hw_req, queue);
 638
 639                 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 640                         dma_pool_free(hwep->td_pool, node->ptr, node->dma);
 641                         list_del_init(&node->td);
 642                         node->ptr = NULL;
 643                         kfree(node);
 644                 }
 645
 646                 list_del_init(&hwreq->queue);
 647                 hwreq->req.status = -ESHUTDOWN;
 648
 649                 if (hwreq->req.complete != NULL) {
 650                         spin_unlock(hwep->lock);
 651                         usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
 652                         spin_lock(hwep->lock);
 653                 }
 654         }
 655
 656         if (hwep->pending_td)
 657                 free_pending_td(hwep);
 658
 659         return 0;
 660 }
 661
 662 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
 663 {
 664         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
 665         int direction, retval = 0;
 666         unsigned long flags;
 667
 668         if (ep == NULL || hwep->ep.desc == NULL)
 669                 return -EINVAL;
 670
 671         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
 672                 return -EOPNOTSUPP;
 673
 674         spin_lock_irqsave(hwep->lock, flags);
 675
 676         if (value && hwep->dir == TX && check_transfer &&
 677                 !list_empty(&hwep->qh.queue) &&
 678                         !usb_endpoint_xfer_control(hwep->ep.desc)) {
 679                 spin_unlock_irqrestore(hwep->lock, flags);
 680                 return -EAGAIN;
 681         }
 682
 683         direction = hwep->dir;
 684         do {
 685                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
 686
 687                 if (!value)
 688                         hwep->wedge = 0;
 689
 690                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
 691                         hwep->dir = (hwep->dir == TX) ? RX : TX;
 692
 693         } while (hwep->dir != direction);
 694
 695         spin_unlock_irqrestore(hwep->lock, flags);
 696         return retval;
 697 }
 698
 699
 700 /**
 701  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 702  * @gadget: gadget
 703  *
 704  * This function returns an error code
 705  */
 706 static int _gadget_stop_activity(struct usb_gadget *gadget)
 707 {
 708         struct usb_ep *ep;
 709         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 710         unsigned long flags;
 711
 712         spin_lock_irqsave(&ci->lock, flags);
 713         ci->gadget.speed = USB_SPEED_UNKNOWN;
 714         ci->remote_wakeup = 0;
 715         ci->suspended = 0;
 716         spin_unlock_irqrestore(&ci->lock, flags);
 717
 718         /* flush all endpoints */
 719         gadget_for_each_ep(ep, gadget) {
 720                 usb_ep_fifo_flush(ep);
 721         }
 722         usb_ep_fifo_flush(&ci->ep0out->ep);
 723         usb_ep_fifo_flush(&ci->ep0in->ep);
 724
 725         /* make sure to disable all endpoints */
 726         gadget_for_each_ep(ep, gadget) {
 727                 usb_ep_disable(ep);
 728         }
 729
 730         if (ci->status != NULL) {
 731                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 732                 ci->status = NULL;
 733         }
 734
 735         return 0;
 736 }
 737
 738 /******************************************************************************
 739  * ISR block
 740  *****************************************************************************/
 741 /**
 742  * isr_reset_handler: USB reset interrupt handler
 743  * @ci: UDC device
 744  *
 745  * This function resets USB engine after a bus reset occurred
 746  */
 747 static void isr_reset_handler(struct ci_hdrc *ci)
 748 __releases(ci->lock)
 749 __acquires(ci->lock)
 750 {
 751         int retval;
 752
 753         spin_unlock(&ci->lock);
 754         if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 755                 usb_gadget_udc_reset(&ci->gadget, ci->driver);
 756
 757         retval = _gadget_stop_activity(&ci->gadget);
 758         if (retval)
 759                 goto done;
 760
 761         retval = hw_usb_reset(ci);
 762         if (retval)
 763                 goto done;
 764
 765         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 766         if (ci->status == NULL)
 767                 retval = -ENOMEM;
 768
 769 done:
 770         spin_lock(&ci->lock);
 771
 772         if (retval)
 773                 dev_err(ci->dev, "error: %i\n", retval);
 774 }
 775
 776 /**
 777  * isr_get_status_complete: get_status request complete function
 778  * @ep:  endpoint
 779  * @req: request handled
 780  *
 781  * Caller must release lock
 782  */
 783 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 784 {
 785         if (ep == NULL || req == NULL)
 786                 return;
 787
 788         kfree(req->buf);
 789         usb_ep_free_request(ep, req);
 790 }
 791
 792 /**
 793  * _ep_queue: queues (submits) an I/O request to an endpoint
 794  * @ep:        endpoint
 795  * @req:       request
 796  * @gfp_flags: GFP flags (not used)
 797  *
 798  * Caller must hold lock
 799  * This function returns an error code
 800  */
 801 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 802                     gfp_t __maybe_unused gfp_flags)
 803 {
 804         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 805         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 806         struct ci_hdrc *ci = hwep->ci;
 807         int retval = 0;
 808
 809         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 810                 return -EINVAL;
 811
 812         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 813                 if (req->length)
 814                         hwep = (ci->ep0_dir == RX) ?
 815                                ci->ep0out : ci->ep0in;
 816                 if (!list_empty(&hwep->qh.queue)) {
 817                         _ep_nuke(hwep);
 818                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 819                                  _usb_addr(hwep));
 820                 }
 821         }
 822
 823         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 824             hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
 825                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 826                 return -EMSGSIZE;
 827         }
 828
 829         /* first nuke then test link, e.g. previous status has not sent */
 830         if (!list_empty(&hwreq->queue)) {
 831                 dev_err(hwep->ci->dev, "request already in queue\n");
 832                 return -EBUSY;
 833         }
 834
 835         /* push request */
 836         hwreq->req.status = -EINPROGRESS;
 837         hwreq->req.actual = 0;
 838
 839         retval = _hardware_enqueue(hwep, hwreq);
 840
 841         if (retval == -EALREADY)
 842                 retval = 0;
 843         if (!retval)
 844                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
 845
 846         return retval;
 847 }
 848
 849 /**
 850  * isr_get_status_response: get_status request response
 851  * @ci: ci struct
 852  * @setup: setup request packet
 853  *
 854  * This function returns an error code
 855  */
 856 static int isr_get_status_response(struct ci_hdrc *ci,
 857                                    struct usb_ctrlrequest *setup)
 858 __releases(hwep->lock)
 859 __acquires(hwep->lock)
 860 {
 861         struct ci_hw_ep *hwep = ci->ep0in;
 862         struct usb_request *req = NULL;
 863         gfp_t gfp_flags = GFP_ATOMIC;
 864         int dir, num, retval;
 865
 866         if (hwep == NULL || setup == NULL)
 867                 return -EINVAL;
 868
 869         spin_unlock(hwep->lock);
 870         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 871         spin_lock(hwep->lock);
 872         if (req == NULL)
 873                 return -ENOMEM;
 874
 875         req->complete = isr_get_status_complete;
 876         req->length   = 2;
 877         req->buf      = kzalloc(req->length, gfp_flags);
 878         if (req->buf == NULL) {
 879                 retval = -ENOMEM;
 880                 goto err_free_req;
 881         }
 882
 883         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
 884                 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
 885                         ci->gadget.is_selfpowered;
 886         } else if ((setup->bRequestType & USB_RECIP_MASK) \
 887                    == USB_RECIP_ENDPOINT) {
 888                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
 889                         TX : RX;
 890                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 891                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
 892         }
 893         /* else do nothing; reserved for future use */
 894
 895         retval = _ep_queue(&hwep->ep, req, gfp_flags);
 896         if (retval)
 897                 goto err_free_buf;
 898
 899         return 0;
 900
 901  err_free_buf:
 902         kfree(req->buf);
 903  err_free_req:
 904         spin_unlock(hwep->lock);
 905         usb_ep_free_request(&hwep->ep, req);
 906         spin_lock(hwep->lock);
 907         return retval;
 908 }
 909
 910 /**
 911  * isr_setup_status_complete: setup_status request complete function
 912  * @ep:  endpoint
 913  * @req: request handled
 914  *
 915  * Caller must release lock. Put the port in test mode if test mode
 916  * feature is selected.
 917  */
 918 static void
 919 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
 920 {
 921         struct ci_hdrc *ci = req->context;
 922         unsigned long flags;
 923
 924         if (ci->setaddr) {
 925                 hw_usb_set_address(ci, ci->address);
 926                 ci->setaddr = false;
 927                 if (ci->address)
 928                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
 929         }
 930
 931         spin_lock_irqsave(&ci->lock, flags);
 932         if (ci->test_mode)
 933                 hw_port_test_set(ci, ci->test_mode);
 934         spin_unlock_irqrestore(&ci->lock, flags);
 935 }
 936
 937 /**
 938  * isr_setup_status_phase: queues the status phase of a setup transation
 939  * @ci: ci struct
 940  *
 941  * This function returns an error code
 942  */
 943 static int isr_setup_status_phase(struct ci_hdrc *ci)
 944 {
 945         struct ci_hw_ep *hwep;
 946
 947         /*
 948          * Unexpected USB controller behavior, caused by bad signal integrity
 949          * or ground reference problems, can lead to isr_setup_status_phase
 950          * being called with ci->status equal to NULL.
 951          * If this situation occurs, you should review your USB hardware design.
 952          */
 953         if (WARN_ON_ONCE(!ci->status))
 954                 return -EPIPE;
 955
 956         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
 957         ci->status->context = ci;
 958         ci->status->complete = isr_setup_status_complete;
 959
 960         return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
 961 }
 962
 963 /**
 964  * isr_tr_complete_low: transaction complete low level handler
 965  * @hwep: endpoint
 966  *
 967  * This function returns an error code
 968  * Caller must hold lock
 969  */
 970 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
 971 __releases(hwep->lock)
 972 __acquires(hwep->lock)
 973 {
 974         struct ci_hw_req *hwreq, *hwreqtemp;
 975         struct ci_hw_ep *hweptemp = hwep;
 976         int retval = 0;
 977
 978         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
 979                         queue) {
 980                 retval = _hardware_dequeue(hwep, hwreq);
 981                 if (retval < 0)
 982                         break;
 983                 list_del_init(&hwreq->queue);
 984                 if (hwreq->req.complete != NULL) {
 985                         spin_unlock(hwep->lock);
 986                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
 987                                         hwreq->req.length)
 988                                 hweptemp = hwep->ci->ep0in;
 989                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
 990                         spin_lock(hwep->lock);
 991                 }
 992         }
 993
 994         if (retval == -EBUSY)
 995                 retval = 0;
 996
 997         return retval;
 998 }
 999
1000 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1001 {
1002         dev_warn(&ci->gadget.dev,
1003                 "connect the device to an alternate port if you want HNP\n");
1004         return isr_setup_status_phase(ci);
1005 }
1006
1007 /**
1008  * isr_setup_packet_handler: setup packet handler
1009  * @ci: UDC descriptor
1010  *
1011  * This function handles setup packet
1012  */
1013 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1014 __releases(ci->lock)
1015 __acquires(ci->lock)
1016 {
1017         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1018         struct usb_ctrlrequest req;
1019         int type, num, dir, err = -EINVAL;
1020         u8 tmode = 0;
1021
1022         /*
1023          * Flush data and handshake transactions of previous
1024          * setup packet.
1025          */
1026         _ep_nuke(ci->ep0out);
1027         _ep_nuke(ci->ep0in);
1028
1029         /* read_setup_packet */
1030         do {
1031                 hw_test_and_set_setup_guard(ci);
1032                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1033         } while (!hw_test_and_clear_setup_guard(ci));
1034
1035         type = req.bRequestType;
1036
1037         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1038
1039         switch (req.bRequest) {
1040         case USB_REQ_CLEAR_FEATURE:
1041                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1042                                 le16_to_cpu(req.wValue) ==
1043                                 USB_ENDPOINT_HALT) {
1044                         if (req.wLength != 0)
1045                                 break;
1046                         num  = le16_to_cpu(req.wIndex);
1047                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1048                         num &= USB_ENDPOINT_NUMBER_MASK;
1049                         if (dir == TX)
1050                                 num += ci->hw_ep_max / 2;
1051                         if (!ci->ci_hw_ep[num].wedge) {
1052                                 spin_unlock(&ci->lock);
1053                                 err = usb_ep_clear_halt(
1054                                         &ci->ci_hw_ep[num].ep);
1055                                 spin_lock(&ci->lock);
1056                                 if (err)
1057                                         break;
1058                         }
1059                         err = isr_setup_status_phase(ci);
1060                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1061                                 le16_to_cpu(req.wValue) ==
1062                                 USB_DEVICE_REMOTE_WAKEUP) {
1063                         if (req.wLength != 0)
1064                                 break;
1065                         ci->remote_wakeup = 0;
1066                         err = isr_setup_status_phase(ci);
1067                 } else {
1068                         goto delegate;
1069                 }
1070                 break;
1071         case USB_REQ_GET_STATUS:
1072                 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1073                         le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1074                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1075                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1076                         goto delegate;
1077                 if (le16_to_cpu(req.wLength) != 2 ||
1078                     le16_to_cpu(req.wValue)  != 0)
1079                         break;
1080                 err = isr_get_status_response(ci, &req);
1081                 break;
1082         case USB_REQ_SET_ADDRESS:
1083                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1084                         goto delegate;
1085                 if (le16_to_cpu(req.wLength) != 0 ||
1086                     le16_to_cpu(req.wIndex)  != 0)
1087                         break;
1088                 ci->address = (u8)le16_to_cpu(req.wValue);
1089                 ci->setaddr = true;
1090                 err = isr_setup_status_phase(ci);
1091                 break;
1092         case USB_REQ_SET_FEATURE:
1093                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1094                                 le16_to_cpu(req.wValue) ==
1095                                 USB_ENDPOINT_HALT) {
1096                         if (req.wLength != 0)
1097                                 break;
1098                         num  = le16_to_cpu(req.wIndex);
1099                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1100                         num &= USB_ENDPOINT_NUMBER_MASK;
1101                         if (dir == TX)
1102                                 num += ci->hw_ep_max / 2;
1103
1104                         spin_unlock(&ci->lock);
1105                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1106                         spin_lock(&ci->lock);
1107                         if (!err)
1108                                 isr_setup_status_phase(ci);
1109                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1110                         if (req.wLength != 0)
1111                                 break;
1112                         switch (le16_to_cpu(req.wValue)) {
1113                         case USB_DEVICE_REMOTE_WAKEUP:
1114                                 ci->remote_wakeup = 1;
1115                                 err = isr_setup_status_phase(ci);
1116                                 break;
1117                         case USB_DEVICE_TEST_MODE:
1118                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1119                                 switch (tmode) {
1120                                 case TEST_J:
1121                                 case TEST_K:
1122                                 case TEST_SE0_NAK:
1123                                 case TEST_PACKET:
1124                                 case TEST_FORCE_EN:
1125                                         ci->test_mode = tmode;
1126                                         err = isr_setup_status_phase(
1127                                                         ci);
1128                                         break;
1129                                 default:
1130                                         break;
1131                                 }
1132                                 break;
1133                         case USB_DEVICE_B_HNP_ENABLE:
1134                                 if (ci_otg_is_fsm_mode(ci)) {
1135                                         ci->gadget.b_hnp_enable = 1;
1136                                         err = isr_setup_status_phase(
1137                                                         ci);
1138                                 }
1139                                 break;
1140                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1141                                 if (ci_otg_is_fsm_mode(ci))
1142                                         err = otg_a_alt_hnp_support(ci);
1143                                 break;
1144                         case USB_DEVICE_A_HNP_SUPPORT:
1145                                 if (ci_otg_is_fsm_mode(ci)) {
1146                                         ci->gadget.a_hnp_support = 1;
1147                                         err = isr_setup_status_phase(
1148                                                         ci);
1149                                 }
1150                                 break;
1151                         default:
1152                                 goto delegate;
1153                         }
1154                 } else {
1155                         goto delegate;
1156                 }
1157                 break;
1158         default:
1159 delegate:
1160                 if (req.wLength == 0)   /* no data phase */
1161                         ci->ep0_dir = TX;
1162
1163                 spin_unlock(&ci->lock);
1164                 err = ci->driver->setup(&ci->gadget, &req);
1165                 spin_lock(&ci->lock);
1166                 break;
1167         }
1168
1169         if (err < 0) {
1170                 spin_unlock(&ci->lock);
1171                 if (_ep_set_halt(&hwep->ep, 1, false))
1172                         dev_err(ci->dev, "error: _ep_set_halt\n");
1173                 spin_lock(&ci->lock);
1174         }
1175 }
1176
1177 /**
1178  * isr_tr_complete_handler: transaction complete interrupt handler
1179  * @ci: UDC descriptor
1180  *
1181  * This function handles traffic events
1182  */
1183 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1184 __releases(ci->lock)
1185 __acquires(ci->lock)
1186 {
1187         unsigned i;
1188         int err;
1189
1190         for (i = 0; i < ci->hw_ep_max; i++) {
1191                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1192
1193                 if (hwep->ep.desc == NULL)
1194                         continue;   /* not configured */
1195
1196                 if (hw_test_and_clear_complete(ci, i)) {
1197                         err = isr_tr_complete_low(hwep);
1198                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1199                                 if (err > 0)   /* needs status phase */
1200                                         err = isr_setup_status_phase(ci);
1201                                 if (err < 0) {
1202                                         spin_unlock(&ci->lock);
1203                                         if (_ep_set_halt(&hwep->ep, 1, false))
1204                                                 dev_err(ci->dev,
1205                                                 "error: _ep_set_halt\n");
1206                                         spin_lock(&ci->lock);
1207                                 }
1208                         }
1209                 }
1210
1211                 /* Only handle setup packet below */
1212                 if (i == 0 &&
1213                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1214                         isr_setup_packet_handler(ci);
1215         }
1216 }
1217
1218 /******************************************************************************
1219  * ENDPT block
1220  *****************************************************************************/
1221 /**
1222  * ep_enable: configure endpoint, making it usable
1223  *
1224  * Check usb_ep_enable() at "usb_gadget.h" for details
1225  */
1226 static int ep_enable(struct usb_ep *ep,
1227                      const struct usb_endpoint_descriptor *desc)
1228 {
1229         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1230         int retval = 0;
1231         unsigned long flags;
1232         u32 cap = 0;
1233
1234         if (ep == NULL || desc == NULL)
1235                 return -EINVAL;
1236
1237         spin_lock_irqsave(hwep->lock, flags);
1238
1239         /* only internal SW should enable ctrl endpts */
1240
1241         if (!list_empty(&hwep->qh.queue)) {
1242                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1243                 spin_unlock_irqrestore(hwep->lock, flags);
1244                 return -EBUSY;
1245         }
1246
1247         hwep->ep.desc = desc;
1248
1249         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1250         hwep->num  = usb_endpoint_num(desc);
1251         hwep->type = usb_endpoint_type(desc);
1252
1253         hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1254         hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1255
1256         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1257                 cap |= QH_IOS;
1258
1259         cap |= QH_ZLT;
1260         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1261         /*
1262          * For ISO-TX, we set mult at QH as the largest value, and use
1263          * MultO at TD as real mult value.
1264          */
1265         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1266                 cap |= 3 << __ffs(QH_MULT);
1267
1268         hwep->qh.ptr->cap = cpu_to_le32(cap);
1269
1270         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1271
1272         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1273                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1274                 retval = -EINVAL;
1275         }
1276
1277         /*
1278          * Enable endpoints in the HW other than ep0 as ep0
1279          * is always enabled
1280          */
1281         if (hwep->num)
1282                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1283                                        hwep->type);
1284
1285         spin_unlock_irqrestore(hwep->lock, flags);
1286         return retval;
1287 }
1288
1289 /**
1290  * ep_disable: endpoint is no longer usable
1291  *
1292  * Check usb_ep_disable() at "usb_gadget.h" for details
1293  */
1294 static int ep_disable(struct usb_ep *ep)
1295 {
1296         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1297         int direction, retval = 0;
1298         unsigned long flags;
1299
1300         if (ep == NULL)
1301                 return -EINVAL;
1302         else if (hwep->ep.desc == NULL)
1303                 return -EBUSY;
1304
1305         spin_lock_irqsave(hwep->lock, flags);
1306
1307         /* only internal SW should disable ctrl endpts */
1308
1309         direction = hwep->dir;
1310         do {
1311                 retval |= _ep_nuke(hwep);
1312                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1313
1314                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1315                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1316
1317         } while (hwep->dir != direction);
1318
1319         hwep->ep.desc = NULL;
1320
1321         spin_unlock_irqrestore(hwep->lock, flags);
1322         return retval;
1323 }
1324
1325 /**
1326  * ep_alloc_request: allocate a request object to use with this endpoint
1327  *
1328  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1329  */
1330 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1331 {
1332         struct ci_hw_req *hwreq = NULL;
1333
1334         if (ep == NULL)
1335                 return NULL;
1336
1337         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1338         if (hwreq != NULL) {
1339                 INIT_LIST_HEAD(&hwreq->queue);
1340                 INIT_LIST_HEAD(&hwreq->tds);
1341         }
1342
1343         return (hwreq == NULL) ? NULL : &hwreq->req;
1344 }
1345
1346 /**
1347  * ep_free_request: frees a request object
1348  *
1349  * Check usb_ep_free_request() at "usb_gadget.h" for details
1350  */
1351 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1352 {
1353         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1354         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1355         struct td_node *node, *tmpnode;
1356         unsigned long flags;
1357
1358         if (ep == NULL || req == NULL) {
1359                 return;
1360         } else if (!list_empty(&hwreq->queue)) {
1361                 dev_err(hwep->ci->dev, "freeing queued request\n");
1362                 return;
1363         }
1364
1365         spin_lock_irqsave(hwep->lock, flags);
1366
1367         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1368                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1369                 list_del_init(&node->td);
1370                 node->ptr = NULL;
1371                 kfree(node);
1372         }
1373
1374         kfree(hwreq);
1375
1376         spin_unlock_irqrestore(hwep->lock, flags);
1377 }
1378
1379 /**
1380  * ep_queue: queues (submits) an I/O request to an endpoint
1381  *
1382  * Check usb_ep_queue()* at usb_gadget.h" for details
1383  */
1384 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1385                     gfp_t __maybe_unused gfp_flags)
1386 {
1387         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1388         int retval = 0;
1389         unsigned long flags;
1390
1391         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1392                 return -EINVAL;
1393
1394         spin_lock_irqsave(hwep->lock, flags);
1395         retval = _ep_queue(ep, req, gfp_flags);
1396         spin_unlock_irqrestore(hwep->lock, flags);
1397         return retval;
1398 }
1399
1400 /**
1401  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1402  *
1403  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1404  */
1405 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1406 {
1407         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1408         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1409         unsigned long flags;
1410         struct td_node *node, *tmpnode;
1411
1412         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1413                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1414                 list_empty(&hwep->qh.queue))
1415                 return -EINVAL;
1416
1417         spin_lock_irqsave(hwep->lock, flags);
1418
1419         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1420
1421         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1422                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1423                 list_del(&node->td);
1424                 kfree(node);
1425         }
1426
1427         /* pop request */
1428         list_del_init(&hwreq->queue);
1429
1430         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1431
1432         req->status = -ECONNRESET;
1433
1434         if (hwreq->req.complete != NULL) {
1435                 spin_unlock(hwep->lock);
1436                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1437                 spin_lock(hwep->lock);
1438         }
1439
1440         spin_unlock_irqrestore(hwep->lock, flags);
1441         return 0;
1442 }
1443
1444 /**
1445  * ep_set_halt: sets the endpoint halt feature
1446  *
1447  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1448  */
1449 static int ep_set_halt(struct usb_ep *ep, int value)
1450 {
1451         return _ep_set_halt(ep, value, true);
1452 }
1453
1454 /**
1455  * ep_set_wedge: sets the halt feature and ignores clear requests
1456  *
1457  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1458  */
1459 static int ep_set_wedge(struct usb_ep *ep)
1460 {
1461         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1462         unsigned long flags;
1463
1464         if (ep == NULL || hwep->ep.desc == NULL)
1465                 return -EINVAL;
1466
1467         spin_lock_irqsave(hwep->lock, flags);
1468         hwep->wedge = 1;
1469         spin_unlock_irqrestore(hwep->lock, flags);
1470
1471         return usb_ep_set_halt(ep);
1472 }
1473
1474 /**
1475  * ep_fifo_flush: flushes contents of a fifo
1476  *
1477  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1478  */
1479 static void ep_fifo_flush(struct usb_ep *ep)
1480 {
1481         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1482         unsigned long flags;
1483
1484         if (ep == NULL) {
1485                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1486                 return;
1487         }
1488
1489         spin_lock_irqsave(hwep->lock, flags);
1490
1491         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1492
1493         spin_unlock_irqrestore(hwep->lock, flags);
1494 }
1495
1496 /**
1497  * Endpoint-specific part of the API to the USB controller hardware
1498  * Check "usb_gadget.h" for details
1499  */
1500 static const struct usb_ep_ops usb_ep_ops = {
1501         .enable        = ep_enable,
1502         .disable       = ep_disable,
1503         .alloc_request = ep_alloc_request,
1504         .free_request  = ep_free_request,
1505         .queue         = ep_queue,
1506         .dequeue       = ep_dequeue,
1507         .set_halt      = ep_set_halt,
1508         .set_wedge     = ep_set_wedge,
1509         .fifo_flush    = ep_fifo_flush,
1510 };
1511
1512 /******************************************************************************
1513  * GADGET block
1514  *****************************************************************************/
1515 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1516 {
1517         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1518         unsigned long flags;
1519         int gadget_ready = 0;
1520
1521         spin_lock_irqsave(&ci->lock, flags);
1522         ci->vbus_active = is_active;
1523         if (ci->driver)
1524                 gadget_ready = 1;
1525         spin_unlock_irqrestore(&ci->lock, flags);
1526
1527         if (ci->usb_phy)
1528                 usb_phy_set_charger_state(ci->usb_phy, is_active ?
1529                         USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
1530
1531         if (gadget_ready) {
1532                 if (is_active) {
1533                         pm_runtime_get_sync(&_gadget->dev);
1534                         hw_device_reset(ci);
1535                         hw_device_state(ci, ci->ep0out->qh.dma);
1536                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1537                         usb_udc_vbus_handler(_gadget, true);
1538                 } else {
1539                         usb_udc_vbus_handler(_gadget, false);
1540                         if (ci->driver)
1541                                 ci->driver->disconnect(&ci->gadget);
1542                         hw_device_state(ci, 0);
1543                         if (ci->platdata->notify_event)
1544                                 ci->platdata->notify_event(ci,
1545                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
1546                         _gadget_stop_activity(&ci->gadget);
1547                         pm_runtime_put_sync(&_gadget->dev);
1548                         usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1549                 }
1550         }
1551
1552         return 0;
1553 }
1554
1555 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1556 {
1557         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1558         unsigned long flags;
1559         int ret = 0;
1560
1561         spin_lock_irqsave(&ci->lock, flags);
1562         if (!ci->remote_wakeup) {
1563                 ret = -EOPNOTSUPP;
1564                 goto out;
1565         }
1566         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1567                 ret = -EINVAL;
1568                 goto out;
1569         }
1570         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1571 out:
1572         spin_unlock_irqrestore(&ci->lock, flags);
1573         return ret;
1574 }
1575
1576 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1577 {
1578         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1579
1580         if (ci->usb_phy)
1581                 return usb_phy_set_power(ci->usb_phy, ma);
1582         return -ENOTSUPP;
1583 }
1584
1585 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1586 {
1587         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1588         struct ci_hw_ep *hwep = ci->ep0in;
1589         unsigned long flags;
1590
1591         spin_lock_irqsave(hwep->lock, flags);
1592         _gadget->is_selfpowered = (is_on != 0);
1593         spin_unlock_irqrestore(hwep->lock, flags);
1594
1595         return 0;
1596 }
1597
1598 /* Change Data+ pullup status
1599  * this func is used by usb_gadget_connect/disconnet
1600  */
1601 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1602 {
1603         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1604
1605         /*
1606          * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1607          * and don't touch Data+ in host mode for dual role config.
1608          */
1609         if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1610                 return 0;
1611
1612         pm_runtime_get_sync(&ci->gadget.dev);
1613         if (is_on)
1614                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1615         else
1616                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1617         pm_runtime_put_sync(&ci->gadget.dev);
1618
1619         return 0;
1620 }
1621
1622 static int ci_udc_start(struct usb_gadget *gadget,
1623                          struct usb_gadget_driver *driver);
1624 static int ci_udc_stop(struct usb_gadget *gadget);
1625 /**
1626  * Device operations part of the API to the USB controller hardware,
1627  * which don't involve endpoints (or i/o)
1628  * Check  "usb_gadget.h" for details
1629  */
1630 static const struct usb_gadget_ops usb_gadget_ops = {
1631         .vbus_session   = ci_udc_vbus_session,
1632         .wakeup         = ci_udc_wakeup,
1633         .set_selfpowered        = ci_udc_selfpowered,
1634         .pullup         = ci_udc_pullup,
1635         .vbus_draw      = ci_udc_vbus_draw,
1636         .udc_start      = ci_udc_start,
1637         .udc_stop       = ci_udc_stop,
1638 };
1639
1640 static int init_eps(struct ci_hdrc *ci)
1641 {
1642         int retval = 0, i, j;
1643
1644         for (i = 0; i < ci->hw_ep_max/2; i++)
1645                 for (j = RX; j <= TX; j++) {
1646                         int k = i + j * ci->hw_ep_max/2;
1647                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1648
1649                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1650                                         (j == TX)  ? "in" : "out");
1651
1652                         hwep->ci          = ci;
1653                         hwep->lock         = &ci->lock;
1654                         hwep->td_pool      = ci->td_pool;
1655
1656                         hwep->ep.name      = hwep->name;
1657                         hwep->ep.ops       = &usb_ep_ops;
1658
1659                         if (i == 0) {
1660                                 hwep->ep.caps.type_control = true;
1661                         } else {
1662                                 hwep->ep.caps.type_iso = true;
1663                                 hwep->ep.caps.type_bulk = true;
1664                                 hwep->ep.caps.type_int = true;
1665                         }
1666
1667                         if (j == TX)
1668                                 hwep->ep.caps.dir_in = true;
1669                         else
1670                                 hwep->ep.caps.dir_out = true;
1671
1672                         /*
1673                          * for ep0: maxP defined in desc, for other
1674                          * eps, maxP is set by epautoconfig() called
1675                          * by gadget layer
1676                          */
1677                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1678
1679                         INIT_LIST_HEAD(&hwep->qh.queue);
1680                         hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1681                                                        &hwep->qh.dma);
1682                         if (hwep->qh.ptr == NULL)
1683                                 retval = -ENOMEM;
1684
1685                         /*
1686                          * set up shorthands for ep0 out and in endpoints,
1687                          * don't add to gadget's ep_list
1688                          */
1689                         if (i == 0) {
1690                                 if (j == RX)
1691                                         ci->ep0out = hwep;
1692                                 else
1693                                         ci->ep0in = hwep;
1694
1695                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1696                                 continue;
1697                         }
1698
1699                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1700                 }
1701
1702         return retval;
1703 }
1704
1705 static void destroy_eps(struct ci_hdrc *ci)
1706 {
1707         int i;
1708
1709         for (i = 0; i < ci->hw_ep_max; i++) {
1710                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1711
1712                 if (hwep->pending_td)
1713                         free_pending_td(hwep);
1714                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1715         }
1716 }
1717
1718 /**
1719  * ci_udc_start: register a gadget driver
1720  * @gadget: our gadget
1721  * @driver: the driver being registered
1722  *
1723  * Interrupts are enabled here.
1724  */
1725 static int ci_udc_start(struct usb_gadget *gadget,
1726                          struct usb_gadget_driver *driver)
1727 {
1728         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1729         int retval = -ENOMEM;
1730
1731         if (driver->disconnect == NULL)
1732                 return -EINVAL;
1733
1734
1735         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1736         retval = usb_ep_enable(&ci->ep0out->ep);
1737         if (retval)
1738                 return retval;
1739
1740         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1741         retval = usb_ep_enable(&ci->ep0in->ep);
1742         if (retval)
1743                 return retval;
1744
1745         ci->driver = driver;
1746
1747         /* Start otg fsm for B-device */
1748         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1749                 ci_hdrc_otg_fsm_start(ci);
1750                 return retval;
1751         }
1752
1753         pm_runtime_get_sync(&ci->gadget.dev);
1754         if (ci->vbus_active) {
1755                 hw_device_reset(ci);
1756         } else {
1757                 usb_udc_vbus_handler(&ci->gadget, false);
1758                 pm_runtime_put_sync(&ci->gadget.dev);
1759                 return retval;
1760         }
1761
1762         retval = hw_device_state(ci, ci->ep0out->qh.dma);
1763         if (retval)
1764                 pm_runtime_put_sync(&ci->gadget.dev);
1765
1766         return retval;
1767 }
1768
1769 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1770 {
1771         if (!ci_otg_is_fsm_mode(ci))
1772                 return;
1773
1774         mutex_lock(&ci->fsm.lock);
1775         if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1776                 ci->fsm.a_bidl_adis_tmout = 1;
1777                 ci_hdrc_otg_fsm_start(ci);
1778         } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1779                 ci->fsm.protocol = PROTO_UNDEF;
1780                 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1781         }
1782         mutex_unlock(&ci->fsm.lock);
1783 }
1784
1785 /**
1786  * ci_udc_stop: unregister a gadget driver
1787  */
1788 static int ci_udc_stop(struct usb_gadget *gadget)
1789 {
1790         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1791         unsigned long flags;
1792
1793         spin_lock_irqsave(&ci->lock, flags);
1794
1795         if (ci->vbus_active) {
1796                 hw_device_state(ci, 0);
1797                 spin_unlock_irqrestore(&ci->lock, flags);
1798                 if (ci->platdata->notify_event)
1799                         ci->platdata->notify_event(ci,
1800                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1801                 _gadget_stop_activity(&ci->gadget);
1802                 spin_lock_irqsave(&ci->lock, flags);
1803                 pm_runtime_put(&ci->gadget.dev);
1804         }
1805
1806         ci->driver = NULL;
1807         spin_unlock_irqrestore(&ci->lock, flags);
1808
1809         ci_udc_stop_for_otg_fsm(ci);
1810         return 0;
1811 }
1812
1813 /******************************************************************************
1814  * BUS block
1815  *****************************************************************************/
1816 /**
1817  * udc_irq: ci interrupt handler
1818  *
1819  * This function returns IRQ_HANDLED if the IRQ has been handled
1820  * It locks access to registers
1821  */
1822 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1823 {
1824         irqreturn_t retval;
1825         u32 intr;
1826
1827         if (ci == NULL)
1828                 return IRQ_HANDLED;
1829
1830         spin_lock(&ci->lock);
1831
1832         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1833                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1834                                 USBMODE_CM_DC) {
1835                         spin_unlock(&ci->lock);
1836                         return IRQ_NONE;
1837                 }
1838         }
1839         intr = hw_test_and_clear_intr_active(ci);
1840
1841         if (intr) {
1842                 /* order defines priority - do NOT change it */
1843                 if (USBi_URI & intr)
1844                         isr_reset_handler(ci);
1845
1846                 if (USBi_PCI & intr) {
1847                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
1848                                 USB_SPEED_HIGH : USB_SPEED_FULL;
1849                         if (ci->suspended) {
1850                                 if (ci->driver->resume) {
1851                                         spin_unlock(&ci->lock);
1852                                         ci->driver->resume(&ci->gadget);
1853                                         spin_lock(&ci->lock);
1854                                 }
1855                                 ci->suspended = 0;
1856                                 usb_gadget_set_state(&ci->gadget,
1857                                                 ci->resume_state);
1858                         }
1859                 }
1860
1861                 if (USBi_UI  & intr)
1862                         isr_tr_complete_handler(ci);
1863
1864                 if ((USBi_SLI & intr) && !(ci->suspended)) {
1865                         ci->suspended = 1;
1866                         ci->resume_state = ci->gadget.state;
1867                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1868                             ci->driver->suspend) {
1869                                 spin_unlock(&ci->lock);
1870                                 ci->driver->suspend(&ci->gadget);
1871                                 spin_lock(&ci->lock);
1872                         }
1873                         usb_gadget_set_state(&ci->gadget,
1874                                         USB_STATE_SUSPENDED);
1875                 }
1876                 retval = IRQ_HANDLED;
1877         } else {
1878                 retval = IRQ_NONE;
1879         }
1880         spin_unlock(&ci->lock);
1881
1882         return retval;
1883 }
1884
1885 /**
1886  * udc_start: initialize gadget role
1887  * @ci: chipidea controller
1888  */
1889 static int udc_start(struct ci_hdrc *ci)
1890 {
1891         struct device *dev = ci->dev;
1892         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1893         int retval = 0;
1894
1895         ci->gadget.ops          = &usb_gadget_ops;
1896         ci->gadget.speed        = USB_SPEED_UNKNOWN;
1897         ci->gadget.max_speed    = USB_SPEED_HIGH;
1898         ci->gadget.name         = ci->platdata->name;
1899         ci->gadget.otg_caps     = otg_caps;
1900
1901         if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
1902                 ci->gadget.quirk_avoids_skb_reserve = 1;
1903
1904         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1905                                                 otg_caps->adp_support))
1906                 ci->gadget.is_otg = 1;
1907
1908         INIT_LIST_HEAD(&ci->gadget.ep_list);
1909
1910         /* alloc resources */
1911         ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
1912                                        sizeof(struct ci_hw_qh),
1913                                        64, CI_HDRC_PAGE_SIZE);
1914         if (ci->qh_pool == NULL)
1915                 return -ENOMEM;
1916
1917         ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
1918                                        sizeof(struct ci_hw_td),
1919                                        64, CI_HDRC_PAGE_SIZE);
1920         if (ci->td_pool == NULL) {
1921                 retval = -ENOMEM;
1922                 goto free_qh_pool;
1923         }
1924
1925         retval = init_eps(ci);
1926         if (retval)
1927                 goto free_pools;
1928
1929         ci->gadget.ep0 = &ci->ep0in->ep;
1930
1931         retval = usb_add_gadget_udc(dev, &ci->gadget);
1932         if (retval)
1933                 goto destroy_eps;
1934
1935         pm_runtime_no_callbacks(&ci->gadget.dev);
1936         pm_runtime_enable(&ci->gadget.dev);
1937
1938         return retval;
1939
1940 destroy_eps:
1941         destroy_eps(ci);
1942 free_pools:
1943         dma_pool_destroy(ci->td_pool);
1944 free_qh_pool:
1945         dma_pool_destroy(ci->qh_pool);
1946         return retval;
1947 }
1948
1949 /**
1950  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1951  *
1952  * No interrupts active, the IRQ has been released
1953  */
1954 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1955 {
1956         if (!ci->roles[CI_ROLE_GADGET])
1957                 return;
1958
1959         usb_del_gadget_udc(&ci->gadget);
1960
1961         destroy_eps(ci);
1962
1963         dma_pool_destroy(ci->td_pool);
1964         dma_pool_destroy(ci->qh_pool);
1965 }
1966
1967 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1968 {
1969         if (ci->platdata->pins_device)
1970                 pinctrl_select_state(ci->platdata->pctl,
1971                                      ci->platdata->pins_device);
1972
1973         if (ci->is_otg)
1974                 /* Clear and enable BSV irq */
1975                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1976                                         OTGSC_BSVIS | OTGSC_BSVIE);
1977
1978         return 0;
1979 }
1980
1981 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1982 {
1983         /*
1984          * host doesn't care B_SESSION_VALID event
1985          * so clear and disbale BSV irq
1986          */
1987         if (ci->is_otg)
1988                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1989
1990         ci->vbus_active = 0;
1991
1992         if (ci->platdata->pins_device && ci->platdata->pins_default)
1993                 pinctrl_select_state(ci->platdata->pctl,
1994                                      ci->platdata->pins_default);
1995 }
1996
1997 /**
1998  * ci_hdrc_gadget_init - initialize device related bits
1999  * ci: the controller
2000  *
2001  * This function initializes the gadget, if the device is "device capable".
2002  */
2003 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2004 {
2005         struct ci_role_driver *rdrv;
2006         int ret;
2007
2008         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2009                 return -ENXIO;
2010
2011         rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2012         if (!rdrv)
2013                 return -ENOMEM;
2014
2015         rdrv->start     = udc_id_switch_for_device;
2016         rdrv->stop      = udc_id_switch_for_host;
2017         rdrv->irq       = udc_irq;
2018         rdrv->name      = "gadget";
2019
2020         ret = udc_start(ci);
2021         if (!ret)
2022                 ci->roles[CI_ROLE_GADGET] = rdrv;
2023
2024         return ret;
2025 }