drivers/usb/chipidea/udc.c

   1 /*
   2  * udc.c - ChipIdea UDC driver
   3  *
   4  * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
   5  *
   6  * Author: David Lopo
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/device.h>
  15 #include <linux/dmapool.h>
  16 #include <linux/err.h>
  17 #include <linux/irqreturn.h>
  18 #include <linux/kernel.h>
  19 #include <linux/slab.h>
  20 #include <linux/pm_runtime.h>
  21 #include <linux/usb/ch9.h>
  22 #include <linux/usb/gadget.h>
  23 #include <linux/usb/otg-fsm.h>
  24 #include <linux/usb/chipidea.h>
  25
  26 #include "ci.h"
  27 #include "udc.h"
  28 #include "bits.h"
  29 #include "debug.h"
  30 #include "otg.h"
  31 #include "otg_fsm.h"
  32
  33 /* control endpoint description */
  34 static const struct usb_endpoint_descriptor
  35 ctrl_endpt_out_desc = {
  36         .bLength         = USB_DT_ENDPOINT_SIZE,
  37         .bDescriptorType = USB_DT_ENDPOINT,
  38
  39         .bEndpointAddress = USB_DIR_OUT,
  40         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  41         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  42 };
  43
  44 static const struct usb_endpoint_descriptor
  45 ctrl_endpt_in_desc = {
  46         .bLength         = USB_DT_ENDPOINT_SIZE,
  47         .bDescriptorType = USB_DT_ENDPOINT,
  48
  49         .bEndpointAddress = USB_DIR_IN,
  50         .bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  51         .wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  52 };
  53
  54 /**
  55  * hw_ep_bit: calculates the bit number
  56  * @num: endpoint number
  57  * @dir: endpoint direction
  58  *
  59  * This function returns bit number
  60  */
  61 static inline int hw_ep_bit(int num, int dir)
  62 {
  63         return num + (dir ? 16 : 0);
  64 }
  65
  66 static inline int ep_to_bit(struct ci_hdrc *ci, int n)
  67 {
  68         int fill = 16 - ci->hw_ep_max / 2;
  69
  70         if (n >= ci->hw_ep_max / 2)
  71                 n += fill;
  72
  73         return n;
  74 }
  75
  76 /**
  77  * hw_device_state: enables/disables interrupts (execute without interruption)
  78  * @dma: 0 => disable, !0 => enable and set dma engine
  79  *
  80  * This function returns an error code
  81  */
  82 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
  83 {
  84         if (dma) {
  85                 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
  86                 /* interrupt, error, port change, reset, sleep/suspend */
  87                 hw_write(ci, OP_USBINTR, ~0,
  88                              USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
  89                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
  90         } else {
  91                 hw_write(ci, OP_USBINTR, ~0, 0);
  92                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
  93         }
  94         return 0;
  95 }
  96
  97 /**
  98  * hw_ep_flush: flush endpoint fifo (execute without interruption)
  99  * @num: endpoint number
 100  * @dir: endpoint direction
 101  *
 102  * This function returns an error code
 103  */
 104 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
 105 {
 106         int n = hw_ep_bit(num, dir);
 107
 108         do {
 109                 /* flush any pending transfer */
 110                 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
 111                 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
 112                         cpu_relax();
 113         } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
 114
 115         return 0;
 116 }
 117
 118 /**
 119  * hw_ep_disable: disables endpoint (execute without interruption)
 120  * @num: endpoint number
 121  * @dir: endpoint direction
 122  *
 123  * This function returns an error code
 124  */
 125 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
 126 {
 127         hw_ep_flush(ci, num, dir);
 128         hw_write(ci, OP_ENDPTCTRL + num,
 129                  dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 130         return 0;
 131 }
 132
 133 /**
 134  * hw_ep_enable: enables endpoint (execute without interruption)
 135  * @num:  endpoint number
 136  * @dir:  endpoint direction
 137  * @type: endpoint type
 138  *
 139  * This function returns an error code
 140  */
 141 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
 142 {
 143         u32 mask, data;
 144
 145         if (dir) {
 146                 mask  = ENDPTCTRL_TXT;  /* type    */
 147                 data  = type << __ffs(mask);
 148
 149                 mask |= ENDPTCTRL_TXS;  /* unstall */
 150                 mask |= ENDPTCTRL_TXR;  /* reset data toggle */
 151                 data |= ENDPTCTRL_TXR;
 152                 mask |= ENDPTCTRL_TXE;  /* enable  */
 153                 data |= ENDPTCTRL_TXE;
 154         } else {
 155                 mask  = ENDPTCTRL_RXT;  /* type    */
 156                 data  = type << __ffs(mask);
 157
 158                 mask |= ENDPTCTRL_RXS;  /* unstall */
 159                 mask |= ENDPTCTRL_RXR;  /* reset data toggle */
 160                 data |= ENDPTCTRL_RXR;
 161                 mask |= ENDPTCTRL_RXE;  /* enable  */
 162                 data |= ENDPTCTRL_RXE;
 163         }
 164         hw_write(ci, OP_ENDPTCTRL + num, mask, data);
 165         return 0;
 166 }
 167
 168 /**
 169  * hw_ep_get_halt: return endpoint halt status
 170  * @num: endpoint number
 171  * @dir: endpoint direction
 172  *
 173  * This function returns 1 if endpoint halted
 174  */
 175 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
 176 {
 177         u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 178
 179         return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
 180 }
 181
 182 /**
 183  * hw_ep_prime: primes endpoint (execute without interruption)
 184  * @num:     endpoint number
 185  * @dir:     endpoint direction
 186  * @is_ctrl: true if control endpoint
 187  *
 188  * This function returns an error code
 189  */
 190 static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
 191 {
 192         int n = hw_ep_bit(num, dir);
 193
 194         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 195                 return -EAGAIN;
 196
 197         hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
 198
 199         while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 200                 cpu_relax();
 201         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 202                 return -EAGAIN;
 203
 204         /* status shoult be tested according with manual but it doesn't work */
 205         return 0;
 206 }
 207
 208 /**
 209  * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
 210  *                 without interruption)
 211  * @num:   endpoint number
 212  * @dir:   endpoint direction
 213  * @value: true => stall, false => unstall
 214  *
 215  * This function returns an error code
 216  */
 217 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
 218 {
 219         if (value != 0 && value != 1)
 220                 return -EINVAL;
 221
 222         do {
 223                 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
 224                 u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 225                 u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
 226
 227                 /* data toggle - reserved for EP0 but it's in ESS */
 228                 hw_write(ci, reg, mask_xs|mask_xr,
 229                           value ? mask_xs : mask_xr);
 230         } while (value != hw_ep_get_halt(ci, num, dir));
 231
 232         return 0;
 233 }
 234
 235 /**
 236  * hw_is_port_high_speed: test if port is high speed
 237  *
 238  * This function returns true if high speed port
 239  */
 240 static int hw_port_is_high_speed(struct ci_hdrc *ci)
 241 {
 242         return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
 243                 hw_read(ci, OP_PORTSC, PORTSC_HSP);
 244 }
 245
 246 /**
 247  * hw_test_and_clear_complete: test & clear complete status (execute without
 248  *                             interruption)
 249  * @n: endpoint number
 250  *
 251  * This function returns complete status
 252  */
 253 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
 254 {
 255         n = ep_to_bit(ci, n);
 256         return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
 257 }
 258
 259 /**
 260  * hw_test_and_clear_intr_active: test & clear active interrupts (execute
 261  *                                without interruption)
 262  *
 263  * This function returns active interrutps
 264  */
 265 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
 266 {
 267         u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
 268
 269         hw_write(ci, OP_USBSTS, ~0, reg);
 270         return reg;
 271 }
 272
 273 /**
 274  * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
 275  *                                interruption)
 276  *
 277  * This function returns guard value
 278  */
 279 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
 280 {
 281         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
 282 }
 283
 284 /**
 285  * hw_test_and_set_setup_guard: test & set setup guard (execute without
 286  *                              interruption)
 287  *
 288  * This function returns guard value
 289  */
 290 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
 291 {
 292         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
 293 }
 294
 295 /**
 296  * hw_usb_set_address: configures USB address (execute without interruption)
 297  * @value: new USB address
 298  *
 299  * This function explicitly sets the address, without the "USBADRA" (advance)
 300  * feature, which is not supported by older versions of the controller.
 301  */
 302 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
 303 {
 304         hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
 305                  value << __ffs(DEVICEADDR_USBADR));
 306 }
 307
 308 /**
 309  * hw_usb_reset: restart device after a bus reset (execute without
 310  *               interruption)
 311  *
 312  * This function returns an error code
 313  */
 314 static int hw_usb_reset(struct ci_hdrc *ci)
 315 {
 316         hw_usb_set_address(ci, 0);
 317
 318         /* ESS flushes only at end?!? */
 319         hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
 320
 321         /* clear setup token semaphores */
 322         hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
 323
 324         /* clear complete status */
 325         hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
 326
 327         /* wait until all bits cleared */
 328         while (hw_read(ci, OP_ENDPTPRIME, ~0))
 329                 udelay(10);             /* not RTOS friendly */
 330
 331         /* reset all endpoints ? */
 332
 333         /* reset internal status and wait for further instructions
 334            no need to verify the port reset status (ESS does it) */
 335
 336         return 0;
 337 }
 338
 339 /******************************************************************************
 340  * UTIL block
 341  *****************************************************************************/
 342
 343 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 344                           unsigned length)
 345 {
 346         int i;
 347         u32 temp;
 348         struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
 349                                                   GFP_ATOMIC);
 350
 351         if (node == NULL)
 352                 return -ENOMEM;
 353
 354         node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC,
 355                                    &node->dma);
 356         if (node->ptr == NULL) {
 357                 kfree(node);
 358                 return -ENOMEM;
 359         }
 360
 361         memset(node->ptr, 0, sizeof(struct ci_hw_td));
 362         node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
 363         node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
 364         node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
 365         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
 366                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 367
 368                 if (hwreq->req.length == 0
 369                                 || hwreq->req.length % hwep->ep.maxpacket)
 370                         mul++;
 371                 node->ptr->token |= mul << __ffs(TD_MULTO);
 372         }
 373
 374         temp = (u32) (hwreq->req.dma + hwreq->req.actual);
 375         if (length) {
 376                 node->ptr->page[0] = cpu_to_le32(temp);
 377                 for (i = 1; i < TD_PAGE_COUNT; i++) {
 378                         u32 page = temp + i * CI_HDRC_PAGE_SIZE;
 379                         page &= ~TD_RESERVED_MASK;
 380                         node->ptr->page[i] = cpu_to_le32(page);
 381                 }
 382         }
 383
 384         hwreq->req.actual += length;
 385
 386         if (!list_empty(&hwreq->tds)) {
 387                 /* get the last entry */
 388                 lastnode = list_entry(hwreq->tds.prev,
 389                                 struct td_node, td);
 390                 lastnode->ptr->next = cpu_to_le32(node->dma);
 391         }
 392
 393         INIT_LIST_HEAD(&node->td);
 394         list_add_tail(&node->td, &hwreq->tds);
 395
 396         return 0;
 397 }
 398
 399 /**
 400  * _usb_addr: calculates endpoint address from direction & number
 401  * @ep:  endpoint
 402  */
 403 static inline u8 _usb_addr(struct ci_hw_ep *ep)
 404 {
 405         return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
 406 }
 407
 408 /**
 409  * _hardware_queue: configures a request at hardware level
 410  * @gadget: gadget
 411  * @hwep:   endpoint
 412  *
 413  * This function returns an error code
 414  */
 415 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 416 {
 417         struct ci_hdrc *ci = hwep->ci;
 418         int ret = 0;
 419         unsigned rest = hwreq->req.length;
 420         int pages = TD_PAGE_COUNT;
 421         struct td_node *firstnode, *lastnode;
 422
 423         /* don't queue twice */
 424         if (hwreq->req.status == -EALREADY)
 425                 return -EALREADY;
 426
 427         hwreq->req.status = -EALREADY;
 428
 429         ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
 430         if (ret)
 431                 return ret;
 432
 433         /*
 434          * The first buffer could be not page aligned.
 435          * In that case we have to span into one extra td.
 436          */
 437         if (hwreq->req.dma % PAGE_SIZE)
 438                 pages--;
 439
 440         if (rest == 0)
 441                 add_td_to_list(hwep, hwreq, 0);
 442
 443         while (rest > 0) {
 444                 unsigned count = min(hwreq->req.length - hwreq->req.actual,
 445                                         (unsigned)(pages * CI_HDRC_PAGE_SIZE));
 446                 add_td_to_list(hwep, hwreq, count);
 447                 rest -= count;
 448         }
 449
 450         if (hwreq->req.zero && hwreq->req.length
 451             && (hwreq->req.length % hwep->ep.maxpacket == 0))
 452                 add_td_to_list(hwep, hwreq, 0);
 453
 454         firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 455
 456         lastnode = list_entry(hwreq->tds.prev,
 457                 struct td_node, td);
 458
 459         lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
 460         if (!hwreq->req.no_interrupt)
 461                 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
 462         wmb();
 463
 464         hwreq->req.actual = 0;
 465         if (!list_empty(&hwep->qh.queue)) {
 466                 struct ci_hw_req *hwreqprev;
 467                 int n = hw_ep_bit(hwep->num, hwep->dir);
 468                 int tmp_stat;
 469                 struct td_node *prevlastnode;
 470                 u32 next = firstnode->dma & TD_ADDR_MASK;
 471
 472                 hwreqprev = list_entry(hwep->qh.queue.prev,
 473                                 struct ci_hw_req, queue);
 474                 prevlastnode = list_entry(hwreqprev->tds.prev,
 475                                 struct td_node, td);
 476
 477                 prevlastnode->ptr->next = cpu_to_le32(next);
 478                 wmb();
 479                 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 480                         goto done;
 481                 do {
 482                         hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
 483                         tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
 484                 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
 485                 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
 486                 if (tmp_stat)
 487                         goto done;
 488         }
 489
 490         /*  QH configuration */
 491         hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
 492         hwep->qh.ptr->td.token &=
 493                 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
 494
 495         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
 496                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 497
 498                 if (hwreq->req.length == 0
 499                                 || hwreq->req.length % hwep->ep.maxpacket)
 500                         mul++;
 501                 hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
 502         }
 503
 504         wmb();   /* synchronize before ep prime */
 505
 506         ret = hw_ep_prime(ci, hwep->num, hwep->dir,
 507                            hwep->type == USB_ENDPOINT_XFER_CONTROL);
 508 done:
 509         return ret;
 510 }
 511
 512 /*
 513  * free_pending_td: remove a pending request for the endpoint
 514  * @hwep: endpoint
 515  */
 516 static void free_pending_td(struct ci_hw_ep *hwep)
 517 {
 518         struct td_node *pending = hwep->pending_td;
 519
 520         dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
 521         hwep->pending_td = NULL;
 522         kfree(pending);
 523 }
 524
 525 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
 526                                            struct td_node *node)
 527 {
 528         hwep->qh.ptr->td.next = node->dma;
 529         hwep->qh.ptr->td.token &=
 530                 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
 531
 532         /* Synchronize before ep prime */
 533         wmb();
 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) {
 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(&hwep->ci->gadget, &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                         hwreq->req.complete(&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 /**
 662  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 663  * @gadget: gadget
 664  *
 665  * This function returns an error code
 666  */
 667 static int _gadget_stop_activity(struct usb_gadget *gadget)
 668 {
 669         struct usb_ep *ep;
 670         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 671         unsigned long flags;
 672
 673         /* flush all endpoints */
 674         gadget_for_each_ep(ep, gadget) {
 675                 usb_ep_fifo_flush(ep);
 676         }
 677         usb_ep_fifo_flush(&ci->ep0out->ep);
 678         usb_ep_fifo_flush(&ci->ep0in->ep);
 679
 680         /* make sure to disable all endpoints */
 681         gadget_for_each_ep(ep, gadget) {
 682                 usb_ep_disable(ep);
 683         }
 684
 685         if (ci->status != NULL) {
 686                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 687                 ci->status = NULL;
 688         }
 689
 690         spin_lock_irqsave(&ci->lock, flags);
 691         ci->gadget.speed = USB_SPEED_UNKNOWN;
 692         ci->remote_wakeup = 0;
 693         ci->suspended = 0;
 694         spin_unlock_irqrestore(&ci->lock, flags);
 695
 696         return 0;
 697 }
 698
 699 /******************************************************************************
 700  * ISR block
 701  *****************************************************************************/
 702 /**
 703  * isr_reset_handler: USB reset interrupt handler
 704  * @ci: UDC device
 705  *
 706  * This function resets USB engine after a bus reset occurred
 707  */
 708 static void isr_reset_handler(struct ci_hdrc *ci)
 709 __releases(ci->lock)
 710 __acquires(ci->lock)
 711 {
 712         int retval;
 713
 714         spin_unlock(&ci->lock);
 715         if (ci->gadget.speed != USB_SPEED_UNKNOWN) {
 716                 if (ci->driver)
 717                         ci->driver->disconnect(&ci->gadget);
 718         }
 719
 720         retval = _gadget_stop_activity(&ci->gadget);
 721         if (retval)
 722                 goto done;
 723
 724         retval = hw_usb_reset(ci);
 725         if (retval)
 726                 goto done;
 727
 728         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 729         if (ci->status == NULL)
 730                 retval = -ENOMEM;
 731
 732         usb_gadget_set_state(&ci->gadget, USB_STATE_DEFAULT);
 733
 734 done:
 735         spin_lock(&ci->lock);
 736
 737         if (retval)
 738                 dev_err(ci->dev, "error: %i\n", retval);
 739 }
 740
 741 /**
 742  * isr_get_status_complete: get_status request complete function
 743  * @ep:  endpoint
 744  * @req: request handled
 745  *
 746  * Caller must release lock
 747  */
 748 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 749 {
 750         if (ep == NULL || req == NULL)
 751                 return;
 752
 753         kfree(req->buf);
 754         usb_ep_free_request(ep, req);
 755 }
 756
 757 /**
 758  * _ep_queue: queues (submits) an I/O request to an endpoint
 759  *
 760  * Caller must hold lock
 761  */
 762 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 763                     gfp_t __maybe_unused gfp_flags)
 764 {
 765         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 766         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 767         struct ci_hdrc *ci = hwep->ci;
 768         int retval = 0;
 769
 770         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 771                 return -EINVAL;
 772
 773         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 774                 if (req->length)
 775                         hwep = (ci->ep0_dir == RX) ?
 776                                ci->ep0out : ci->ep0in;
 777                 if (!list_empty(&hwep->qh.queue)) {
 778                         _ep_nuke(hwep);
 779                         retval = -EOVERFLOW;
 780                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 781                                  _usb_addr(hwep));
 782                 }
 783         }
 784
 785         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 786             hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
 787                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 788                 return -EMSGSIZE;
 789         }
 790
 791         /* first nuke then test link, e.g. previous status has not sent */
 792         if (!list_empty(&hwreq->queue)) {
 793                 dev_err(hwep->ci->dev, "request already in queue\n");
 794                 return -EBUSY;
 795         }
 796
 797         /* push request */
 798         hwreq->req.status = -EINPROGRESS;
 799         hwreq->req.actual = 0;
 800
 801         retval = _hardware_enqueue(hwep, hwreq);
 802
 803         if (retval == -EALREADY)
 804                 retval = 0;
 805         if (!retval)
 806                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
 807
 808         return retval;
 809 }
 810
 811 /**
 812  * isr_get_status_response: get_status request response
 813  * @ci: ci struct
 814  * @setup: setup request packet
 815  *
 816  * This function returns an error code
 817  */
 818 static int isr_get_status_response(struct ci_hdrc *ci,
 819                                    struct usb_ctrlrequest *setup)
 820 __releases(hwep->lock)
 821 __acquires(hwep->lock)
 822 {
 823         struct ci_hw_ep *hwep = ci->ep0in;
 824         struct usb_request *req = NULL;
 825         gfp_t gfp_flags = GFP_ATOMIC;
 826         int dir, num, retval;
 827
 828         if (hwep == NULL || setup == NULL)
 829                 return -EINVAL;
 830
 831         spin_unlock(hwep->lock);
 832         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 833         spin_lock(hwep->lock);
 834         if (req == NULL)
 835                 return -ENOMEM;
 836
 837         req->complete = isr_get_status_complete;
 838         if (setup->wIndex == OTG_STS_SELECTOR)
 839                 req->length = 1;
 840         else
 841                 req->length = 2;
 842         req->buf      = kzalloc(req->length, gfp_flags);
 843         if (req->buf == NULL) {
 844                 retval = -ENOMEM;
 845                 goto err_free_req;
 846         }
 847
 848         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
 849                 if ((setup->wIndex == OTG_STS_SELECTOR) &&
 850                                         ci_otg_is_fsm_mode(ci)) {
 851                         if (ci->gadget.host_request_flag)
 852                                 *(u8 *)req->buf = HOST_REQUEST_FLAG;
 853                         else
 854                                 *(u8 *)req->buf = 0;
 855                 } else {
 856                         /* Assume that device is bus powered for now. */
 857                         *(u16 *)req->buf = ci->remote_wakeup << 1;
 858                 }
 859         } else if ((setup->bRequestType & USB_RECIP_MASK) \
 860                    == USB_RECIP_ENDPOINT) {
 861                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
 862                         TX : RX;
 863                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 864                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
 865         }
 866         /* else do nothing; reserved for future use */
 867
 868         retval = _ep_queue(&hwep->ep, req, gfp_flags);
 869         if (retval)
 870                 goto err_free_buf;
 871
 872         return 0;
 873
 874  err_free_buf:
 875         kfree(req->buf);
 876  err_free_req:
 877         spin_unlock(hwep->lock);
 878         usb_ep_free_request(&hwep->ep, req);
 879         spin_lock(hwep->lock);
 880         return retval;
 881 }
 882
 883 /**
 884  * isr_setup_status_complete: setup_status request complete function
 885  * @ep:  endpoint
 886  * @req: request handled
 887  *
 888  * Caller must release lock. Put the port in test mode if test mode
 889  * feature is selected.
 890  */
 891 static void
 892 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
 893 {
 894         struct ci_hdrc *ci = req->context;
 895         unsigned long flags;
 896
 897         if (ci->setaddr) {
 898                 hw_usb_set_address(ci, ci->address);
 899                 ci->setaddr = false;
 900                 if (ci->address)
 901                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
 902         }
 903
 904         spin_lock_irqsave(&ci->lock, flags);
 905         if (ci->test_mode)
 906                 hw_port_test_set(ci, ci->test_mode);
 907         spin_unlock_irqrestore(&ci->lock, flags);
 908 }
 909
 910 /**
 911  * isr_setup_status_phase: queues the status phase of a setup transation
 912  * @ci: ci struct
 913  *
 914  * This function returns an error code
 915  */
 916 static int isr_setup_status_phase(struct ci_hdrc *ci)
 917 {
 918         int retval;
 919         struct ci_hw_ep *hwep;
 920
 921         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
 922         ci->status->context = ci;
 923         ci->status->complete = isr_setup_status_complete;
 924
 925         retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
 926
 927         return retval;
 928 }
 929
 930 /**
 931  * isr_tr_complete_low: transaction complete low level handler
 932  * @hwep: endpoint
 933  *
 934  * This function returns an error code
 935  * Caller must hold lock
 936  */
 937 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
 938 __releases(hwep->lock)
 939 __acquires(hwep->lock)
 940 {
 941         struct ci_hw_req *hwreq, *hwreqtemp;
 942         struct ci_hw_ep *hweptemp = hwep;
 943         int retval = 0;
 944
 945         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
 946                         queue) {
 947                 retval = _hardware_dequeue(hwep, hwreq);
 948                 if (retval < 0)
 949                         break;
 950                 list_del_init(&hwreq->queue);
 951                 if (hwreq->req.complete != NULL) {
 952                         spin_unlock(hwep->lock);
 953                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
 954                                         hwreq->req.length)
 955                                 hweptemp = hwep->ci->ep0in;
 956                         hwreq->req.complete(&hweptemp->ep, &hwreq->req);
 957                         spin_lock(hwep->lock);
 958                 }
 959         }
 960
 961         if (retval == -EBUSY)
 962                 retval = 0;
 963
 964         return retval;
 965 }
 966
 967 /**
 968  * isr_setup_packet_handler: setup packet handler
 969  * @ci: UDC descriptor
 970  *
 971  * This function handles setup packet
 972  */
 973 static void isr_setup_packet_handler(struct ci_hdrc *ci)
 974 __releases(ci->lock)
 975 __acquires(ci->lock)
 976 {
 977         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
 978         struct usb_ctrlrequest req;
 979         int type, num, dir, err = -EINVAL;
 980         u8 tmode = 0;
 981
 982         /*
 983          * Flush data and handshake transactions of previous
 984          * setup packet.
 985          */
 986         _ep_nuke(ci->ep0out);
 987         _ep_nuke(ci->ep0in);
 988
 989         /* read_setup_packet */
 990         do {
 991                 hw_test_and_set_setup_guard(ci);
 992                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
 993         } while (!hw_test_and_clear_setup_guard(ci));
 994
 995         type = req.bRequestType;
 996
 997         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
 998
 999         switch (req.bRequest) {
1000         case USB_REQ_CLEAR_FEATURE:
1001                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1002                                 le16_to_cpu(req.wValue) ==
1003                                 USB_ENDPOINT_HALT) {
1004                         if (req.wLength != 0)
1005                                 break;
1006                         num  = le16_to_cpu(req.wIndex);
1007                         dir = num & USB_ENDPOINT_DIR_MASK;
1008                         num &= USB_ENDPOINT_NUMBER_MASK;
1009                         if (dir) /* TX */
1010                                 num += ci->hw_ep_max / 2;
1011                         if (!ci->ci_hw_ep[num].wedge) {
1012                                 spin_unlock(&ci->lock);
1013                                 err = usb_ep_clear_halt(
1014                                         &ci->ci_hw_ep[num].ep);
1015                                 spin_lock(&ci->lock);
1016                                 if (err)
1017                                         break;
1018                         }
1019                         err = isr_setup_status_phase(ci);
1020                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1021                                 le16_to_cpu(req.wValue) ==
1022                                 USB_DEVICE_REMOTE_WAKEUP) {
1023                         if (req.wLength != 0)
1024                                 break;
1025                         ci->remote_wakeup = 0;
1026                         err = isr_setup_status_phase(ci);
1027                 } else {
1028                         goto delegate;
1029                 }
1030                 break;
1031         case USB_REQ_GET_STATUS:
1032                 if (type != (USB_DIR_IN|USB_RECIP_DEVICE)   &&
1033                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1034                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1035                         goto delegate;
1036                 if ((le16_to_cpu(req.wLength) != 2 &&
1037                         le16_to_cpu(req.wLength) != 1) ||
1038                                 le16_to_cpu(req.wValue) != 0)
1039                         break;
1040                 err = isr_get_status_response(ci, &req);
1041                 break;
1042         case USB_REQ_SET_ADDRESS:
1043                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1044                         goto delegate;
1045                 if (le16_to_cpu(req.wLength) != 0 ||
1046                     le16_to_cpu(req.wIndex)  != 0)
1047                         break;
1048                 ci->address = (u8)le16_to_cpu(req.wValue);
1049                 ci->setaddr = true;
1050                 err = isr_setup_status_phase(ci);
1051                 break;
1052         case USB_REQ_SET_FEATURE:
1053                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1054                                 le16_to_cpu(req.wValue) ==
1055                                 USB_ENDPOINT_HALT) {
1056                         if (req.wLength != 0)
1057                                 break;
1058                         num  = le16_to_cpu(req.wIndex);
1059                         dir = num & USB_ENDPOINT_DIR_MASK;
1060                         num &= USB_ENDPOINT_NUMBER_MASK;
1061                         if (dir) /* TX */
1062                                 num += ci->hw_ep_max / 2;
1063
1064                         spin_unlock(&ci->lock);
1065                         err = usb_ep_set_halt(&ci->ci_hw_ep[num].ep);
1066                         spin_lock(&ci->lock);
1067                         if (!err)
1068                                 isr_setup_status_phase(ci);
1069                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1070                         if (req.wLength != 0)
1071                                 break;
1072                         switch (le16_to_cpu(req.wValue)) {
1073                         case USB_DEVICE_REMOTE_WAKEUP:
1074                                 ci->remote_wakeup = 1;
1075                                 err = isr_setup_status_phase(ci);
1076                                 break;
1077                         case USB_DEVICE_TEST_MODE:
1078                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1079                                 switch (tmode) {
1080                                 case TEST_J:
1081                                 case TEST_K:
1082                                 case TEST_SE0_NAK:
1083                                 case TEST_PACKET:
1084                                 case TEST_FORCE_EN:
1085                                         ci->test_mode = tmode;
1086                                         err = isr_setup_status_phase(
1087                                                         ci);
1088                                         break;
1089                                 default:
1090                                         break;
1091                                 }
1092                                 break;
1093                         case USB_DEVICE_B_HNP_ENABLE:
1094                                 if (ci_otg_is_fsm_mode(ci)) {
1095                                         ci->gadget.b_hnp_enable = 1;
1096                                         err = isr_setup_status_phase(
1097                                                         ci);
1098                                 }
1099                                 break;
1100                         default:
1101                                 goto delegate;
1102                         }
1103                 } else {
1104                         goto delegate;
1105                 }
1106                 break;
1107         default:
1108 delegate:
1109                 if (req.wLength == 0)   /* no data phase */
1110                         ci->ep0_dir = TX;
1111
1112                 spin_unlock(&ci->lock);
1113                 err = ci->driver->setup(&ci->gadget, &req);
1114                 spin_lock(&ci->lock);
1115                 break;
1116         }
1117
1118         if (err < 0) {
1119                 spin_unlock(&ci->lock);
1120                 if (usb_ep_set_halt(&hwep->ep))
1121                         dev_err(ci->dev, "error: ep_set_halt\n");
1122                 spin_lock(&ci->lock);
1123         }
1124 }
1125
1126 /**
1127  * isr_tr_complete_handler: transaction complete interrupt handler
1128  * @ci: UDC descriptor
1129  *
1130  * This function handles traffic events
1131  */
1132 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1133 __releases(ci->lock)
1134 __acquires(ci->lock)
1135 {
1136         unsigned i;
1137         int err;
1138
1139         for (i = 0; i < ci->hw_ep_max; i++) {
1140                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1141
1142                 if (hwep->ep.desc == NULL)
1143                         continue;   /* not configured */
1144
1145                 if (hw_test_and_clear_complete(ci, i)) {
1146                         err = isr_tr_complete_low(hwep);
1147                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1148                                 if (err > 0)   /* needs status phase */
1149                                         err = isr_setup_status_phase(ci);
1150                                 if (err < 0) {
1151                                         spin_unlock(&ci->lock);
1152                                         if (usb_ep_set_halt(&hwep->ep))
1153                                                 dev_err(ci->dev,
1154                                                         "error: ep_set_halt\n");
1155                                         spin_lock(&ci->lock);
1156                                 }
1157                         }
1158                 }
1159
1160                 /* Only handle setup packet below */
1161                 if (i == 0 &&
1162                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1163                         isr_setup_packet_handler(ci);
1164         }
1165 }
1166
1167 /******************************************************************************
1168  * ENDPT block
1169  *****************************************************************************/
1170 /**
1171  * ep_enable: configure endpoint, making it usable
1172  *
1173  * Check usb_ep_enable() at "usb_gadget.h" for details
1174  */
1175 static int ep_enable(struct usb_ep *ep,
1176                      const struct usb_endpoint_descriptor *desc)
1177 {
1178         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1179         int retval = 0;
1180         unsigned long flags;
1181         u32 cap = 0;
1182
1183         if (ep == NULL || desc == NULL)
1184                 return -EINVAL;
1185
1186         spin_lock_irqsave(hwep->lock, flags);
1187
1188         /* only internal SW should enable ctrl endpts */
1189
1190         if (!list_empty(&hwep->qh.queue)) {
1191                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1192                 spin_unlock_irqrestore(hwep->lock, flags);
1193                 return -EBUSY;
1194         }
1195
1196         hwep->ep.desc = desc;
1197
1198         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1199         hwep->num  = usb_endpoint_num(desc);
1200         hwep->type = usb_endpoint_type(desc);
1201
1202         hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
1203         hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
1204
1205         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1206                 cap |= QH_IOS;
1207
1208         cap |= QH_ZLT;
1209         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1210         /*
1211          * For ISO-TX, we set mult at QH as the largest value, and use
1212          * MultO at TD as real mult value.
1213          */
1214         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1215                 cap |= 3 << __ffs(QH_MULT);
1216
1217         hwep->qh.ptr->cap = cpu_to_le32(cap);
1218
1219         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1220
1221         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1222                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1223                 retval = -EINVAL;
1224         }
1225
1226         /*
1227          * Enable endpoints in the HW other than ep0 as ep0
1228          * is always enabled
1229          */
1230         if (hwep->num)
1231                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1232                                        hwep->type);
1233
1234         spin_unlock_irqrestore(hwep->lock, flags);
1235         return retval;
1236 }
1237
1238 /**
1239  * ep_disable: endpoint is no longer usable
1240  *
1241  * Check usb_ep_disable() at "usb_gadget.h" for details
1242  */
1243 static int ep_disable(struct usb_ep *ep)
1244 {
1245         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1246         int direction, retval = 0;
1247         unsigned long flags;
1248
1249         if (ep == NULL)
1250                 return -EINVAL;
1251         else if (hwep->ep.desc == NULL)
1252                 return -EBUSY;
1253
1254         spin_lock_irqsave(hwep->lock, flags);
1255         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1256                 spin_unlock_irqrestore(hwep->lock, flags);
1257                 return 0;
1258         }
1259
1260         /* only internal SW should disable ctrl endpts */
1261
1262         direction = hwep->dir;
1263         do {
1264                 retval |= _ep_nuke(hwep);
1265                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1266
1267                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1268                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1269
1270         } while (hwep->dir != direction);
1271
1272         hwep->ep.desc = NULL;
1273
1274         spin_unlock_irqrestore(hwep->lock, flags);
1275         return retval;
1276 }
1277
1278 /**
1279  * ep_alloc_request: allocate a request object to use with this endpoint
1280  *
1281  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1282  */
1283 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1284 {
1285         struct ci_hw_req *hwreq = NULL;
1286
1287         if (ep == NULL)
1288                 return NULL;
1289
1290         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1291         if (hwreq != NULL) {
1292                 INIT_LIST_HEAD(&hwreq->queue);
1293                 INIT_LIST_HEAD(&hwreq->tds);
1294         }
1295
1296         return (hwreq == NULL) ? NULL : &hwreq->req;
1297 }
1298
1299 /**
1300  * ep_free_request: frees a request object
1301  *
1302  * Check usb_ep_free_request() at "usb_gadget.h" for details
1303  */
1304 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1305 {
1306         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1307         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1308         struct td_node *node, *tmpnode;
1309         unsigned long flags;
1310
1311         if (ep == NULL || req == NULL) {
1312                 return;
1313         } else if (!list_empty(&hwreq->queue)) {
1314                 dev_err(hwep->ci->dev, "freeing queued request\n");
1315                 return;
1316         }
1317
1318         spin_lock_irqsave(hwep->lock, flags);
1319
1320         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1321                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1322                 list_del_init(&node->td);
1323                 node->ptr = NULL;
1324                 kfree(node);
1325         }
1326
1327         kfree(hwreq);
1328
1329         spin_unlock_irqrestore(hwep->lock, flags);
1330 }
1331
1332 /**
1333  * ep_queue: queues (submits) an I/O request to an endpoint
1334  *
1335  * Check usb_ep_queue()* at usb_gadget.h" for details
1336  */
1337 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1338                     gfp_t __maybe_unused gfp_flags)
1339 {
1340         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1341         int retval = 0;
1342         unsigned long flags;
1343
1344         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1345                 return -EINVAL;
1346
1347         spin_lock_irqsave(hwep->lock, flags);
1348         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1349                 spin_unlock_irqrestore(hwep->lock, flags);
1350                 return 0;
1351         }
1352         retval = _ep_queue(ep, req, gfp_flags);
1353         spin_unlock_irqrestore(hwep->lock, flags);
1354         return retval;
1355 }
1356
1357 /**
1358  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1359  *
1360  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1361  */
1362 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1363 {
1364         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1365         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1366         unsigned long flags;
1367         struct td_node *node, *tmpnode;
1368
1369         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1370                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1371                 list_empty(&hwep->qh.queue))
1372                 return -EINVAL;
1373
1374         spin_lock_irqsave(hwep->lock, flags);
1375         if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN)
1376                 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1377
1378         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1379                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1380                 list_del(&node->td);
1381                 kfree(node);
1382         }
1383
1384         /* pop request */
1385         list_del_init(&hwreq->queue);
1386
1387         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1388
1389         req->status = -ECONNRESET;
1390
1391         if (hwreq->req.complete != NULL) {
1392                 spin_unlock(hwep->lock);
1393                 hwreq->req.complete(&hwep->ep, &hwreq->req);
1394                 spin_lock(hwep->lock);
1395         }
1396
1397         spin_unlock_irqrestore(hwep->lock, flags);
1398         return 0;
1399 }
1400
1401 /**
1402  * ep_set_halt: sets the endpoint halt feature
1403  *
1404  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1405  */
1406 static int ep_set_halt(struct usb_ep *ep, int value)
1407 {
1408         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1409         int direction, retval = 0;
1410         unsigned long flags;
1411
1412         if (ep == NULL || hwep->ep.desc == NULL)
1413                 return -EINVAL;
1414
1415         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
1416                 return -EOPNOTSUPP;
1417
1418         spin_lock_irqsave(hwep->lock, flags);
1419
1420         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1421                 spin_unlock_irqrestore(hwep->lock, flags);
1422                 return 0;
1423         }
1424 #ifndef STALL_IN
1425         /* g_file_storage MS compliant but g_zero fails chapter 9 compliance */
1426         if (value && hwep->type == USB_ENDPOINT_XFER_BULK && hwep->dir == TX &&
1427             !list_empty(&hwep->qh.queue)) {
1428                 spin_unlock_irqrestore(hwep->lock, flags);
1429                 return -EAGAIN;
1430         }
1431 #endif
1432
1433         direction = hwep->dir;
1434         do {
1435                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
1436
1437                 if (!value)
1438                         hwep->wedge = 0;
1439
1440                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1441                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1442
1443         } while (hwep->dir != direction);
1444
1445         spin_unlock_irqrestore(hwep->lock, flags);
1446         return retval;
1447 }
1448
1449 /**
1450  * ep_set_wedge: sets the halt feature and ignores clear requests
1451  *
1452  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1453  */
1454 static int ep_set_wedge(struct usb_ep *ep)
1455 {
1456         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1457         unsigned long flags;
1458
1459         if (ep == NULL || hwep->ep.desc == NULL)
1460                 return -EINVAL;
1461
1462         spin_lock_irqsave(hwep->lock, flags);
1463         hwep->wedge = 1;
1464         spin_unlock_irqrestore(hwep->lock, flags);
1465
1466         return usb_ep_set_halt(ep);
1467 }
1468
1469 /**
1470  * ep_fifo_flush: flushes contents of a fifo
1471  *
1472  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1473  */
1474 static void ep_fifo_flush(struct usb_ep *ep)
1475 {
1476         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1477         unsigned long flags;
1478
1479         if (ep == NULL) {
1480                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1481                 return;
1482         }
1483
1484         spin_lock_irqsave(hwep->lock, flags);
1485         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1486                 spin_unlock_irqrestore(hwep->lock, flags);
1487                 return;
1488         }
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         /* Charger Detection */
1527         ci_usb_charger_connect(ci, is_active);
1528
1529         if (gadget_ready)
1530                 ci_hdrc_gadget_connect(_gadget, is_active);
1531
1532         return 0;
1533 }
1534
1535 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1536 {
1537         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1538         unsigned long flags;
1539         int ret = 0;
1540
1541         spin_lock_irqsave(&ci->lock, flags);
1542         if (ci->gadget.speed == USB_SPEED_UNKNOWN) {
1543                 spin_unlock_irqrestore(&ci->lock, flags);
1544                 return 0;
1545         }
1546         if (!ci->remote_wakeup) {
1547                 ret = -EOPNOTSUPP;
1548                 goto out;
1549         }
1550         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1551                 ret = -EINVAL;
1552                 goto out;
1553         }
1554         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1555 out:
1556         spin_unlock_irqrestore(&ci->lock, flags);
1557         return ret;
1558 }
1559
1560 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1561 {
1562         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1563
1564         if (ci->usb_phy)
1565                 return usb_phy_set_power(ci->usb_phy, ma);
1566         return -ENOTSUPP;
1567 }
1568
1569 /* Change Data+ pullup status
1570  * this func is used by usb_gadget_connect/disconnet
1571  */
1572 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1573 {
1574         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1575
1576         if (!ci->vbus_active)
1577                 return -EOPNOTSUPP;
1578
1579         if (is_on)
1580                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1581         else
1582                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1583
1584         return 0;
1585 }
1586
1587 static int ci_udc_start(struct usb_gadget *gadget,
1588                          struct usb_gadget_driver *driver);
1589 static int ci_udc_stop(struct usb_gadget *gadget,
1590                         struct usb_gadget_driver *driver);
1591 /**
1592  * Device operations part of the API to the USB controller hardware,
1593  * which don't involve endpoints (or i/o)
1594  * Check  "usb_gadget.h" for details
1595  */
1596 static const struct usb_gadget_ops usb_gadget_ops = {
1597         .vbus_session   = ci_udc_vbus_session,
1598         .wakeup         = ci_udc_wakeup,
1599         .pullup         = ci_udc_pullup,
1600         .vbus_draw      = ci_udc_vbus_draw,
1601         .udc_start      = ci_udc_start,
1602         .udc_stop       = ci_udc_stop,
1603 };
1604
1605 static int init_eps(struct ci_hdrc *ci)
1606 {
1607         int retval = 0, i, j;
1608
1609         for (i = 0; i < ci->hw_ep_max/2; i++)
1610                 for (j = RX; j <= TX; j++) {
1611                         int k = i + j * ci->hw_ep_max/2;
1612                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1613
1614                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1615                                         (j == TX)  ? "in" : "out");
1616
1617                         hwep->ci          = ci;
1618                         hwep->lock         = &ci->lock;
1619                         hwep->td_pool      = ci->td_pool;
1620
1621                         hwep->ep.name      = hwep->name;
1622                         hwep->ep.ops       = &usb_ep_ops;
1623                         /*
1624                          * for ep0: maxP defined in desc, for other
1625                          * eps, maxP is set by epautoconfig() called
1626                          * by gadget layer
1627                          */
1628                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1629
1630                         INIT_LIST_HEAD(&hwep->qh.queue);
1631                         hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
1632                                                      &hwep->qh.dma);
1633                         if (hwep->qh.ptr == NULL)
1634                                 retval = -ENOMEM;
1635                         else
1636                                 memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
1637
1638                         /*
1639                          * set up shorthands for ep0 out and in endpoints,
1640                          * don't add to gadget's ep_list
1641                          */
1642                         if (i == 0) {
1643                                 if (j == RX)
1644                                         ci->ep0out = hwep;
1645                                 else
1646                                         ci->ep0in = hwep;
1647
1648                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1649                                 continue;
1650                         }
1651
1652                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1653                 }
1654
1655         return retval;
1656 }
1657
1658 static void destroy_eps(struct ci_hdrc *ci)
1659 {
1660         int i;
1661
1662         for (i = 0; i < ci->hw_ep_max; i++) {
1663                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1664
1665                 if (hwep->pending_td)
1666                         free_pending_td(hwep);
1667                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1668         }
1669 }
1670
1671 /**
1672  * ci_udc_start: register a gadget driver
1673  * @gadget: our gadget
1674  * @driver: the driver being registered
1675  *
1676  * Interrupts are enabled here.
1677  */
1678 static int ci_udc_start(struct usb_gadget *gadget,
1679                          struct usb_gadget_driver *driver)
1680 {
1681         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1682         int retval = -ENOMEM;
1683
1684         if (driver->disconnect == NULL)
1685                 return -EINVAL;
1686
1687
1688         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1689         retval = usb_ep_enable(&ci->ep0out->ep);
1690         if (retval)
1691                 return retval;
1692
1693         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1694         retval = usb_ep_enable(&ci->ep0in->ep);
1695         if (retval)
1696                 return retval;
1697
1698         ci->driver = driver;
1699
1700         /* Start otg fsm for B-device */
1701         if (ci_otg_is_fsm_mode(ci)) {
1702                 if (ci->fsm.id)
1703                         ci_hdrc_otg_fsm_start(ci);
1704                 return retval;
1705         }
1706
1707         if (ci->vbus_active)
1708                 ci_hdrc_gadget_connect(&ci->gadget, 1);
1709
1710         return retval;
1711 }
1712
1713 /**
1714  * ci_udc_stop: unregister a gadget driver
1715  */
1716 static int ci_udc_stop(struct usb_gadget *gadget,
1717                         struct usb_gadget_driver *driver)
1718 {
1719         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1720         unsigned long flags;
1721
1722         spin_lock_irqsave(&ci->lock, flags);
1723
1724         if (ci->vbus_active) {
1725                 hw_device_state(ci, 0);
1726                 if (ci->platdata->notify_event)
1727                         ci->platdata->notify_event(ci,
1728                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1729                 spin_unlock_irqrestore(&ci->lock, flags);
1730                 _gadget_stop_activity(&ci->gadget);
1731                 spin_lock_irqsave(&ci->lock, flags);
1732                 pm_runtime_put(&ci->gadget.dev);
1733         }
1734
1735         ci->driver = NULL;
1736         spin_unlock_irqrestore(&ci->lock, flags);
1737
1738         return 0;
1739 }
1740
1741 /******************************************************************************
1742  * BUS block
1743  *****************************************************************************/
1744 /**
1745  * udc_irq: ci interrupt handler
1746  *
1747  * This function returns IRQ_HANDLED if the IRQ has been handled
1748  * It locks access to registers
1749  */
1750 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1751 {
1752         irqreturn_t retval;
1753         u32 intr;
1754
1755         if (ci == NULL)
1756                 return IRQ_HANDLED;
1757
1758         spin_lock(&ci->lock);
1759
1760         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1761                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1762                                 USBMODE_CM_DC) {
1763                         spin_unlock(&ci->lock);
1764                         return IRQ_NONE;
1765                 }
1766         }
1767         intr = hw_test_and_clear_intr_active(ci);
1768
1769         if (intr) {
1770                 /* order defines priority - do NOT change it */
1771                 if (USBi_URI & intr)
1772                         isr_reset_handler(ci);
1773
1774                 if (USBi_PCI & intr) {
1775                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
1776                                 USB_SPEED_HIGH : USB_SPEED_FULL;
1777                         if (ci->suspended && ci->driver->resume) {
1778                                 spin_unlock(&ci->lock);
1779                                 ci->driver->resume(&ci->gadget);
1780                                 spin_lock(&ci->lock);
1781                                 ci->suspended = 0;
1782                         }
1783                 }
1784
1785                 if (USBi_UI  & intr)
1786                         isr_tr_complete_handler(ci);
1787
1788                 if (USBi_SLI & intr) {
1789                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1790                             ci->driver->suspend) {
1791                                 ci->suspended = 1;
1792                                 spin_unlock(&ci->lock);
1793                                 ci->driver->suspend(&ci->gadget);
1794                                 usb_gadget_set_state(&ci->gadget,
1795                                                 USB_STATE_SUSPENDED);
1796                                 spin_lock(&ci->lock);
1797                         }
1798                 }
1799                 retval = IRQ_HANDLED;
1800         } else {
1801                 retval = IRQ_NONE;
1802         }
1803         spin_unlock(&ci->lock);
1804
1805         return retval;
1806 }
1807
1808 /**
1809  * udc_start: initialize gadget role
1810  * @ci: chipidea controller
1811  */
1812 static int udc_start(struct ci_hdrc *ci)
1813 {
1814         struct device *dev = ci->dev;
1815         int retval = 0;
1816
1817         spin_lock_init(&ci->lock);
1818
1819         ci->gadget.ops          = &usb_gadget_ops;
1820         ci->gadget.speed        = USB_SPEED_UNKNOWN;
1821         ci->gadget.max_speed    = USB_SPEED_HIGH;
1822         ci->gadget.is_otg       = ci->is_otg ? 1 : 0;
1823         ci->gadget.name         = ci->platdata->name;
1824
1825         INIT_LIST_HEAD(&ci->gadget.ep_list);
1826
1827         /* alloc resources */
1828         ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
1829                                        sizeof(struct ci_hw_qh),
1830                                        64, CI_HDRC_PAGE_SIZE);
1831         if (ci->qh_pool == NULL)
1832                 return -ENOMEM;
1833
1834         ci->td_pool = dma_pool_create("ci_hw_td", dev,
1835                                        sizeof(struct ci_hw_td),
1836                                        64, CI_HDRC_PAGE_SIZE);
1837         if (ci->td_pool == NULL) {
1838                 retval = -ENOMEM;
1839                 goto free_qh_pool;
1840         }
1841
1842         retval = init_eps(ci);
1843         if (retval)
1844                 goto free_pools;
1845
1846         ci->gadget.ep0 = &ci->ep0in->ep;
1847
1848         retval = usb_add_gadget_udc(dev, &ci->gadget);
1849         if (retval)
1850                 goto destroy_eps;
1851
1852         pm_runtime_no_callbacks(&ci->gadget.dev);
1853         pm_runtime_enable(&ci->gadget.dev);
1854
1855         return retval;
1856
1857 destroy_eps:
1858         destroy_eps(ci);
1859 free_pools:
1860         dma_pool_destroy(ci->td_pool);
1861 free_qh_pool:
1862         dma_pool_destroy(ci->qh_pool);
1863         return retval;
1864 }
1865
1866 /**
1867  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1868  *
1869  * No interrupts active, the IRQ has been released
1870  */
1871 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1872 {
1873         if (!ci->roles[CI_ROLE_GADGET])
1874                 return;
1875
1876         usb_del_gadget_udc(&ci->gadget);
1877
1878         destroy_eps(ci);
1879
1880         dma_pool_destroy(ci->td_pool);
1881         dma_pool_destroy(ci->qh_pool);
1882 }
1883
1884 int ci_usb_charger_connect(struct ci_hdrc *ci, int is_active)
1885 {
1886         int ret = 0;
1887
1888         if (is_active)
1889                 pm_runtime_get_sync(ci->dev);
1890
1891         if (ci->platdata->notify_event) {
1892                 if (is_active)
1893                         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1894
1895                 ret = ci->platdata->notify_event(ci,
1896                                 CI_HDRC_CONTROLLER_VBUS_EVENT);
1897                 if (ret == CI_HDRC_NOTIFY_RET_DEFER_EVENT) {
1898                         hw_device_reset(ci);
1899                         /* Pull up dp */
1900                         hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1901                         ci->platdata->notify_event(ci,
1902                                 CI_HDRC_CONTROLLER_CHARGER_POST_EVENT);
1903                         /* Pull down dp */
1904                         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1905                 }
1906         }
1907
1908         if (!is_active)
1909                 pm_runtime_put_sync(ci->dev);
1910
1911         return ret;
1912 }
1913
1914 /**
1915  * ci_hdrc_gadget_connect: caller make sure gadget driver is binded
1916  */
1917 void ci_hdrc_gadget_connect(struct usb_gadget *gadget, int is_active)
1918 {
1919         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1920
1921         if (is_active) {
1922                 pm_runtime_get_sync(&gadget->dev);
1923                 hw_device_reset(ci);
1924                 hw_device_state(ci, ci->ep0out->qh.dma);
1925                 usb_gadget_set_state(gadget, USB_STATE_POWERED);
1926         } else {
1927                 if (ci->driver)
1928                         ci->driver->disconnect(gadget);
1929                 hw_device_state(ci, 0);
1930                 if (ci->platdata->notify_event)
1931                         ci->platdata->notify_event(ci,
1932                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1933                 _gadget_stop_activity(gadget);
1934                 pm_runtime_put_sync(&gadget->dev);
1935                 usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
1936         }
1937 }
1938
1939 static int udc_id_switch_for_device(struct ci_hdrc *ci)
1940 {
1941         if (!ci->is_otg)
1942                 return 0;
1943
1944         /*
1945          * Clear and enable BSV irq for A-device switch to B-device
1946          * (in otg fsm mode, means A_IDLE->B_DILE) due to ID change.
1947          */
1948         if (!ci_otg_is_fsm_mode(ci) ||
1949                         ci->fsm.otg->state == OTG_STATE_A_IDLE)
1950                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1951                                         OTGSC_BSVIS | OTGSC_BSVIE);
1952
1953         return 0;
1954 }
1955
1956 static void udc_id_switch_for_host(struct ci_hdrc *ci)
1957 {
1958         if (!ci->is_otg)
1959                 return;
1960
1961         /*
1962          * Clear and disbale BSV irq for B-device switch to A-device
1963          * (in otg fsm mode, means B_IDLE->A_IDLE) due to ID change.
1964          */
1965         if (!ci_otg_is_fsm_mode(ci) ||
1966                         ci->fsm.otg->state == OTG_STATE_B_IDLE)
1967                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1968 }
1969
1970 static void udc_suspend_for_power_lost(struct ci_hdrc *ci)
1971 {
1972         /*
1973          * Set OP_ENDPTLISTADDR to be non-zero for
1974          * checking if controller resume from power lost
1975          * in non-host mode.
1976          */
1977         if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0)
1978                 hw_write(ci, OP_ENDPTLISTADDR, ~0, ~0);
1979 }
1980
1981 /* Power lost with device mode */
1982 static void udc_resume_from_power_lost(struct ci_hdrc *ci)
1983 {
1984         /* Force disconnect if power lost with vbus on */
1985         if (!ci_otg_is_fsm_mode(ci) && ci->vbus_active)
1986                 usb_gadget_vbus_disconnect(&ci->gadget);
1987
1988         if (ci->is_otg)
1989                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1990                                         OTGSC_BSVIS | OTGSC_BSVIE);
1991 }
1992
1993 static void udc_suspend(struct ci_hdrc *ci)
1994 {
1995         udc_suspend_for_power_lost(ci);
1996
1997         if (ci->driver && ci->vbus_active &&
1998                         (ci->gadget.state != USB_STATE_SUSPENDED))
1999                 usb_gadget_disconnect(&ci->gadget);
2000 }
2001
2002 static void udc_resume(struct ci_hdrc *ci, bool power_lost)
2003 {
2004         if (power_lost) {
2005                 udc_resume_from_power_lost(ci);
2006         } else {
2007                 if (ci->driver && ci->vbus_active)
2008                         usb_gadget_connect(&ci->gadget);
2009         }
2010 }
2011
2012 /**
2013  * ci_hdrc_gadget_init - initialize device related bits
2014  * ci: the controller
2015  *
2016  * This function initializes the gadget, if the device is "device capable".
2017  */
2018 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2019 {
2020         struct ci_role_driver *rdrv;
2021
2022         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2023                 return -ENXIO;
2024
2025         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
2026         if (!rdrv)
2027                 return -ENOMEM;
2028
2029         rdrv->start     = udc_id_switch_for_device;
2030         rdrv->stop      = udc_id_switch_for_host;
2031         rdrv->irq       = udc_irq;
2032         rdrv->suspend   = udc_suspend;
2033         rdrv->resume    = udc_resume;
2034         rdrv->name      = "gadget";
2035         ci->roles[CI_ROLE_GADGET] = rdrv;
2036
2037         return udc_start(ci);
2038 }