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  * @ci: the controller
  76  * @dma: 0 => disable, !0 => enable and set dma engine
  77  *
  78  * This function returns an error code
  79  */
  80 static int hw_device_state(struct ci_hdrc *ci, u32 dma)
  81 {
  82         if (dma) {
  83                 hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
  84                 /* interrupt, error, port change, reset, sleep/suspend */
  85                 hw_write(ci, OP_USBINTR, ~0,
  86                              USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
  87         } else {
  88                 hw_write(ci, OP_USBINTR, ~0, 0);
  89         }
  90         return 0;
  91 }
  92
  93 /**
  94  * hw_ep_flush: flush endpoint fifo (execute without interruption)
  95  * @ci: the controller
  96  * @num: endpoint number
  97  * @dir: endpoint direction
  98  *
  99  * This function returns an error code
 100  */
 101 static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
 102 {
 103         int n = hw_ep_bit(num, dir);
 104
 105         do {
 106                 /* flush any pending transfer */
 107                 hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
 108                 while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
 109                         cpu_relax();
 110         } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
 111
 112         return 0;
 113 }
 114
 115 /**
 116  * hw_ep_disable: disables endpoint (execute without interruption)
 117  * @ci: the controller
 118  * @num: endpoint number
 119  * @dir: endpoint direction
 120  *
 121  * This function returns an error code
 122  */
 123 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
 124 {
 125         hw_write(ci, OP_ENDPTCTRL + num,
 126                  (dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 127         return 0;
 128 }
 129
 130 /**
 131  * hw_ep_enable: enables endpoint (execute without interruption)
 132  * @ci: the controller
 133  * @num:  endpoint number
 134  * @dir:  endpoint direction
 135  * @type: endpoint type
 136  *
 137  * This function returns an error code
 138  */
 139 static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
 140 {
 141         u32 mask, data;
 142
 143         if (dir == TX) {
 144                 mask  = ENDPTCTRL_TXT;  /* type    */
 145                 data  = type << __ffs(mask);
 146
 147                 mask |= ENDPTCTRL_TXS;  /* unstall */
 148                 mask |= ENDPTCTRL_TXR;  /* reset data toggle */
 149                 data |= ENDPTCTRL_TXR;
 150                 mask |= ENDPTCTRL_TXE;  /* enable  */
 151                 data |= ENDPTCTRL_TXE;
 152         } else {
 153                 mask  = ENDPTCTRL_RXT;  /* type    */
 154                 data  = type << __ffs(mask);
 155
 156                 mask |= ENDPTCTRL_RXS;  /* unstall */
 157                 mask |= ENDPTCTRL_RXR;  /* reset data toggle */
 158                 data |= ENDPTCTRL_RXR;
 159                 mask |= ENDPTCTRL_RXE;  /* enable  */
 160                 data |= ENDPTCTRL_RXE;
 161         }
 162         hw_write(ci, OP_ENDPTCTRL + num, mask, data);
 163         return 0;
 164 }
 165
 166 /**
 167  * hw_ep_get_halt: return endpoint halt status
 168  * @ci: the controller
 169  * @num: endpoint number
 170  * @dir: endpoint direction
 171  *
 172  * This function returns 1 if endpoint halted
 173  */
 174 static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
 175 {
 176         u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 177
 178         return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
 179 }
 180
 181 /**
 182  * hw_ep_prime: primes endpoint (execute without interruption)
 183  * @ci: the controller
 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         /* Synchronize before ep prime */
 195         wmb();
 196
 197         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 198                 return -EAGAIN;
 199
 200         hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
 201
 202         while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 203                 cpu_relax();
 204         if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 205                 return -EAGAIN;
 206
 207         /* status shoult be tested according with manual but it doesn't work */
 208         return 0;
 209 }
 210
 211 /**
 212  * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
 213  *                 without interruption)
 214  * @ci: the controller
 215  * @num:   endpoint number
 216  * @dir:   endpoint direction
 217  * @value: true => stall, false => unstall
 218  *
 219  * This function returns an error code
 220  */
 221 static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
 222 {
 223         if (value != 0 && value != 1)
 224                 return -EINVAL;
 225
 226         do {
 227                 enum ci_hw_regs reg = OP_ENDPTCTRL + num;
 228                 u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 229                 u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
 230
 231                 /* data toggle - reserved for EP0 but it's in ESS */
 232                 hw_write(ci, reg, mask_xs|mask_xr,
 233                           value ? mask_xs : mask_xr);
 234         } while (value != hw_ep_get_halt(ci, num, dir));
 235
 236         return 0;
 237 }
 238
 239 /**
 240  * hw_is_port_high_speed: test if port is high speed
 241  * @ci: the controller
 242  *
 243  * This function returns true if high speed port
 244  */
 245 static int hw_port_is_high_speed(struct ci_hdrc *ci)
 246 {
 247         return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
 248                 hw_read(ci, OP_PORTSC, PORTSC_HSP);
 249 }
 250
 251 /**
 252  * hw_test_and_clear_complete: test & clear complete status (execute without
 253  *                             interruption)
 254  * @ci: the controller
 255  * @n: endpoint number
 256  *
 257  * This function returns complete status
 258  */
 259 static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
 260 {
 261         n = ep_to_bit(ci, n);
 262         return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
 263 }
 264
 265 /**
 266  * hw_test_and_clear_intr_active: test & clear active interrupts (execute
 267  *                                without interruption)
 268  * @ci: the controller
 269  *
 270  * This function returns active interrutps
 271  */
 272 static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
 273 {
 274         u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
 275
 276         hw_write(ci, OP_USBSTS, ~0, reg);
 277         return reg;
 278 }
 279
 280 /**
 281  * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
 282  *                                interruption)
 283  * @ci: the controller
 284  *
 285  * This function returns guard value
 286  */
 287 static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
 288 {
 289         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
 290 }
 291
 292 /**
 293  * hw_test_and_set_setup_guard: test & set setup guard (execute without
 294  *                              interruption)
 295  * @ci: the controller
 296  *
 297  * This function returns guard value
 298  */
 299 static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
 300 {
 301         return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
 302 }
 303
 304 /**
 305  * hw_usb_set_address: configures USB address (execute without interruption)
 306  * @ci: the controller
 307  * @value: new USB address
 308  *
 309  * This function explicitly sets the address, without the "USBADRA" (advance)
 310  * feature, which is not supported by older versions of the controller.
 311  */
 312 static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
 313 {
 314         hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
 315                  value << __ffs(DEVICEADDR_USBADR));
 316 }
 317
 318 /**
 319  * hw_usb_reset: restart device after a bus reset (execute without
 320  *               interruption)
 321  * @ci: the controller
 322  *
 323  * This function returns an error code
 324  */
 325 static int hw_usb_reset(struct ci_hdrc *ci)
 326 {
 327         hw_usb_set_address(ci, 0);
 328
 329         /* ESS flushes only at end?!? */
 330         hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
 331
 332         /* clear setup token semaphores */
 333         hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
 334
 335         /* clear complete status */
 336         hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
 337
 338         /* wait until all bits cleared */
 339         while (hw_read(ci, OP_ENDPTPRIME, ~0))
 340                 udelay(10);             /* not RTOS friendly */
 341
 342         /* reset all endpoints ? */
 343
 344         /* reset internal status and wait for further instructions
 345            no need to verify the port reset status (ESS does it) */
 346
 347         return 0;
 348 }
 349
 350 /******************************************************************************
 351  * UTIL block
 352  *****************************************************************************/
 353
 354 static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 355                         unsigned int length, struct scatterlist *s)
 356 {
 357         int i;
 358         u32 temp;
 359         struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
 360                                                   GFP_ATOMIC);
 361
 362         if (node == NULL)
 363                 return -ENOMEM;
 364
 365         node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma);
 366         if (node->ptr == NULL) {
 367                 kfree(node);
 368                 return -ENOMEM;
 369         }
 370
 371         node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
 372         node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
 373         node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
 374         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
 375                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 376
 377                 if (hwreq->req.length == 0
 378                                 || hwreq->req.length % hwep->ep.maxpacket)
 379                         mul++;
 380                 node->ptr->token |= cpu_to_le32(mul << __ffs(TD_MULTO));
 381         }
 382
 383         if (s) {
 384                 temp = (u32) (sg_dma_address(s) + hwreq->req.actual);
 385                 node->td_remaining_size = CI_MAX_BUF_SIZE - length;
 386         } else {
 387                 temp = (u32) (hwreq->req.dma + hwreq->req.actual);
 388         }
 389
 390         if (length) {
 391                 node->ptr->page[0] = cpu_to_le32(temp);
 392                 for (i = 1; i < TD_PAGE_COUNT; i++) {
 393                         u32 page = temp + i * CI_HDRC_PAGE_SIZE;
 394                         page &= ~TD_RESERVED_MASK;
 395                         node->ptr->page[i] = cpu_to_le32(page);
 396                 }
 397         }
 398
 399         hwreq->req.actual += length;
 400
 401         if (!list_empty(&hwreq->tds)) {
 402                 /* get the last entry */
 403                 lastnode = list_entry(hwreq->tds.prev,
 404                                 struct td_node, td);
 405                 lastnode->ptr->next = cpu_to_le32(node->dma);
 406         }
 407
 408         INIT_LIST_HEAD(&node->td);
 409         list_add_tail(&node->td, &hwreq->tds);
 410
 411         return 0;
 412 }
 413
 414 /**
 415  * _usb_addr: calculates endpoint address from direction & number
 416  * @ep:  endpoint
 417  */
 418 static inline u8 _usb_addr(struct ci_hw_ep *ep)
 419 {
 420         return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
 421 }
 422
 423 static int prepare_td_for_non_sg(struct ci_hw_ep *hwep,
 424                 struct ci_hw_req *hwreq)
 425 {
 426         unsigned int rest = hwreq->req.length;
 427         int pages = TD_PAGE_COUNT;
 428         int ret = 0;
 429
 430         if (rest == 0) {
 431                 ret = add_td_to_list(hwep, hwreq, 0, NULL);
 432                 if (ret < 0)
 433                         return ret;
 434         }
 435
 436         /*
 437          * The first buffer could be not page aligned.
 438          * In that case we have to span into one extra td.
 439          */
 440         if (hwreq->req.dma % PAGE_SIZE)
 441                 pages--;
 442
 443         while (rest > 0) {
 444                 unsigned int count = min(hwreq->req.length - hwreq->req.actual,
 445                         (unsigned int)(pages * CI_HDRC_PAGE_SIZE));
 446
 447                 ret = add_td_to_list(hwep, hwreq, count, NULL);
 448                 if (ret < 0)
 449                         return ret;
 450
 451                 rest -= count;
 452         }
 453
 454         if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
 455             && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
 456                 ret = add_td_to_list(hwep, hwreq, 0, NULL);
 457                 if (ret < 0)
 458                         return ret;
 459         }
 460
 461         return ret;
 462 }
 463
 464 static int prepare_td_per_sg(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 465                 struct scatterlist *s)
 466 {
 467         unsigned int rest = sg_dma_len(s);
 468         int ret = 0;
 469
 470         hwreq->req.actual = 0;
 471         while (rest > 0) {
 472                 unsigned int count = min_t(unsigned int, rest,
 473                                 CI_MAX_BUF_SIZE);
 474
 475                 ret = add_td_to_list(hwep, hwreq, count, s);
 476                 if (ret < 0)
 477                         return ret;
 478
 479                 rest -= count;
 480         }
 481
 482         return ret;
 483 }
 484
 485 static void ci_add_buffer_entry(struct td_node *node, struct scatterlist *s)
 486 {
 487         int empty_td_slot_index = (CI_MAX_BUF_SIZE - node->td_remaining_size)
 488                         / CI_HDRC_PAGE_SIZE;
 489         int i;
 490         u32 token;
 491
 492         token = le32_to_cpu(node->ptr->token) + (sg_dma_len(s) << __ffs(TD_TOTAL_BYTES));
 493         node->ptr->token = cpu_to_le32(token);
 494
 495         for (i = empty_td_slot_index; i < TD_PAGE_COUNT; i++) {
 496                 u32 page = (u32) sg_dma_address(s) +
 497                         (i - empty_td_slot_index) * CI_HDRC_PAGE_SIZE;
 498
 499                 page &= ~TD_RESERVED_MASK;
 500                 node->ptr->page[i] = cpu_to_le32(page);
 501         }
 502 }
 503
 504 static int prepare_td_for_sg(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 505 {
 506         struct usb_request *req = &hwreq->req;
 507         struct scatterlist *s = req->sg;
 508         int ret = 0, i = 0;
 509         struct td_node *node = NULL;
 510
 511         if (!s || req->zero || req->length == 0) {
 512                 dev_err(hwep->ci->dev, "not supported operation for sg\n");
 513                 return -EINVAL;
 514         }
 515
 516         while (i++ < req->num_mapped_sgs) {
 517                 if (sg_dma_address(s) % PAGE_SIZE) {
 518                         dev_err(hwep->ci->dev, "not page aligned sg buffer\n");
 519                         return -EINVAL;
 520                 }
 521
 522                 if (node && (node->td_remaining_size >= sg_dma_len(s))) {
 523                         ci_add_buffer_entry(node, s);
 524                         node->td_remaining_size -= sg_dma_len(s);
 525                 } else {
 526                         ret = prepare_td_per_sg(hwep, hwreq, s);
 527                         if (ret)
 528                                 return ret;
 529
 530                         node = list_entry(hwreq->tds.prev,
 531                                 struct td_node, td);
 532                 }
 533
 534                 s = sg_next(s);
 535         }
 536
 537         return ret;
 538 }
 539
 540 /**
 541  * _hardware_enqueue: configures a request at hardware level
 542  * @hwep:   endpoint
 543  * @hwreq:  request
 544  *
 545  * This function returns an error code
 546  */
 547 static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 548 {
 549         struct ci_hdrc *ci = hwep->ci;
 550         int ret = 0;
 551         struct td_node *firstnode, *lastnode;
 552
 553         /* don't queue twice */
 554         if (hwreq->req.status == -EALREADY)
 555                 return -EALREADY;
 556
 557         hwreq->req.status = -EALREADY;
 558
 559         ret = usb_gadget_map_request_by_dev(ci->dev->parent,
 560                                             &hwreq->req, hwep->dir);
 561         if (ret)
 562                 return ret;
 563
 564         if (hwreq->req.num_mapped_sgs)
 565                 ret = prepare_td_for_sg(hwep, hwreq);
 566         else
 567                 ret = prepare_td_for_non_sg(hwep, hwreq);
 568
 569         if (ret)
 570                 return ret;
 571
 572         firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 573
 574         lastnode = list_entry(hwreq->tds.prev,
 575                 struct td_node, td);
 576
 577         lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
 578         if (!hwreq->req.no_interrupt)
 579                 lastnode->ptr->token |= cpu_to_le32(TD_IOC);
 580         wmb();
 581
 582         hwreq->req.actual = 0;
 583         if (!list_empty(&hwep->qh.queue)) {
 584                 struct ci_hw_req *hwreqprev;
 585                 int n = hw_ep_bit(hwep->num, hwep->dir);
 586                 int tmp_stat;
 587                 struct td_node *prevlastnode;
 588                 u32 next = firstnode->dma & TD_ADDR_MASK;
 589
 590                 hwreqprev = list_entry(hwep->qh.queue.prev,
 591                                 struct ci_hw_req, queue);
 592                 prevlastnode = list_entry(hwreqprev->tds.prev,
 593                                 struct td_node, td);
 594
 595                 prevlastnode->ptr->next = cpu_to_le32(next);
 596                 wmb();
 597                 if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 598                         goto done;
 599                 do {
 600                         hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
 601                         tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
 602                 } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
 603                 hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
 604                 if (tmp_stat)
 605                         goto done;
 606         }
 607
 608         /*  QH configuration */
 609         hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
 610         hwep->qh.ptr->td.token &=
 611                 cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
 612
 613         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
 614                 u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 615
 616                 if (hwreq->req.length == 0
 617                                 || hwreq->req.length % hwep->ep.maxpacket)
 618                         mul++;
 619                 hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT));
 620         }
 621
 622         ret = hw_ep_prime(ci, hwep->num, hwep->dir,
 623                            hwep->type == USB_ENDPOINT_XFER_CONTROL);
 624 done:
 625         return ret;
 626 }
 627
 628 /**
 629  * free_pending_td: remove a pending request for the endpoint
 630  * @hwep: endpoint
 631  */
 632 static void free_pending_td(struct ci_hw_ep *hwep)
 633 {
 634         struct td_node *pending = hwep->pending_td;
 635
 636         dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
 637         hwep->pending_td = NULL;
 638         kfree(pending);
 639 }
 640
 641 static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
 642                                            struct td_node *node)
 643 {
 644         hwep->qh.ptr->td.next = cpu_to_le32(node->dma);
 645         hwep->qh.ptr->td.token &=
 646                 cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
 647
 648         return hw_ep_prime(ci, hwep->num, hwep->dir,
 649                                 hwep->type == USB_ENDPOINT_XFER_CONTROL);
 650 }
 651
 652 /**
 653  * _hardware_dequeue: handles a request at hardware level
 654  * @hwep: endpoint
 655  * @hwreq:  request
 656  *
 657  * This function returns an error code
 658  */
 659 static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 660 {
 661         u32 tmptoken;
 662         struct td_node *node, *tmpnode;
 663         unsigned remaining_length;
 664         unsigned actual = hwreq->req.length;
 665         struct ci_hdrc *ci = hwep->ci;
 666
 667         if (hwreq->req.status != -EALREADY)
 668                 return -EINVAL;
 669
 670         hwreq->req.status = 0;
 671
 672         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 673                 tmptoken = le32_to_cpu(node->ptr->token);
 674                 if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
 675                         int n = hw_ep_bit(hwep->num, hwep->dir);
 676
 677                         if (ci->rev == CI_REVISION_24)
 678                                 if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 679                                         reprime_dtd(ci, hwep, node);
 680                         hwreq->req.status = -EALREADY;
 681                         return -EBUSY;
 682                 }
 683
 684                 remaining_length = (tmptoken & TD_TOTAL_BYTES);
 685                 remaining_length >>= __ffs(TD_TOTAL_BYTES);
 686                 actual -= remaining_length;
 687
 688                 hwreq->req.status = tmptoken & TD_STATUS;
 689                 if ((TD_STATUS_HALTED & hwreq->req.status)) {
 690                         hwreq->req.status = -EPIPE;
 691                         break;
 692                 } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
 693                         hwreq->req.status = -EPROTO;
 694                         break;
 695                 } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
 696                         hwreq->req.status = -EILSEQ;
 697                         break;
 698                 }
 699
 700                 if (remaining_length) {
 701                         if (hwep->dir == TX) {
 702                                 hwreq->req.status = -EPROTO;
 703                                 break;
 704                         }
 705                 }
 706                 /*
 707                  * As the hardware could still address the freed td
 708                  * which will run the udc unusable, the cleanup of the
 709                  * td has to be delayed by one.
 710                  */
 711                 if (hwep->pending_td)
 712                         free_pending_td(hwep);
 713
 714                 hwep->pending_td = node;
 715                 list_del_init(&node->td);
 716         }
 717
 718         usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
 719                                         &hwreq->req, hwep->dir);
 720
 721         hwreq->req.actual += actual;
 722
 723         if (hwreq->req.status)
 724                 return hwreq->req.status;
 725
 726         return hwreq->req.actual;
 727 }
 728
 729 /**
 730  * _ep_nuke: dequeues all endpoint requests
 731  * @hwep: endpoint
 732  *
 733  * This function returns an error code
 734  * Caller must hold lock
 735  */
 736 static int _ep_nuke(struct ci_hw_ep *hwep)
 737 __releases(hwep->lock)
 738 __acquires(hwep->lock)
 739 {
 740         struct td_node *node, *tmpnode;
 741         if (hwep == NULL)
 742                 return -EINVAL;
 743
 744         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
 745
 746         while (!list_empty(&hwep->qh.queue)) {
 747
 748                 /* pop oldest request */
 749                 struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
 750                                                      struct ci_hw_req, queue);
 751
 752                 list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 753                         dma_pool_free(hwep->td_pool, node->ptr, node->dma);
 754                         list_del_init(&node->td);
 755                         node->ptr = NULL;
 756                         kfree(node);
 757                 }
 758
 759                 list_del_init(&hwreq->queue);
 760                 hwreq->req.status = -ESHUTDOWN;
 761
 762                 if (hwreq->req.complete != NULL) {
 763                         spin_unlock(hwep->lock);
 764                         usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
 765                         spin_lock(hwep->lock);
 766                 }
 767         }
 768
 769         if (hwep->pending_td)
 770                 free_pending_td(hwep);
 771
 772         return 0;
 773 }
 774
 775 static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
 776 {
 777         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
 778         int direction, retval = 0;
 779         unsigned long flags;
 780
 781         if (ep == NULL || hwep->ep.desc == NULL)
 782                 return -EINVAL;
 783
 784         if (usb_endpoint_xfer_isoc(hwep->ep.desc))
 785                 return -EOPNOTSUPP;
 786
 787         spin_lock_irqsave(hwep->lock, flags);
 788
 789         if (value && hwep->dir == TX && check_transfer &&
 790                 !list_empty(&hwep->qh.queue) &&
 791                         !usb_endpoint_xfer_control(hwep->ep.desc)) {
 792                 spin_unlock_irqrestore(hwep->lock, flags);
 793                 return -EAGAIN;
 794         }
 795
 796         direction = hwep->dir;
 797         do {
 798                 retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
 799
 800                 if (!value)
 801                         hwep->wedge = 0;
 802
 803                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
 804                         hwep->dir = (hwep->dir == TX) ? RX : TX;
 805
 806         } while (hwep->dir != direction);
 807
 808         spin_unlock_irqrestore(hwep->lock, flags);
 809         return retval;
 810 }
 811
 812
 813 /**
 814  * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 815  * @gadget: gadget
 816  *
 817  * This function returns an error code
 818  */
 819 static int _gadget_stop_activity(struct usb_gadget *gadget)
 820 {
 821         struct usb_ep *ep;
 822         struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 823         unsigned long flags;
 824
 825         /* flush all endpoints */
 826         gadget_for_each_ep(ep, gadget) {
 827                 usb_ep_fifo_flush(ep);
 828         }
 829         usb_ep_fifo_flush(&ci->ep0out->ep);
 830         usb_ep_fifo_flush(&ci->ep0in->ep);
 831
 832         /* make sure to disable all endpoints */
 833         gadget_for_each_ep(ep, gadget) {
 834                 usb_ep_disable(ep);
 835         }
 836
 837         if (ci->status != NULL) {
 838                 usb_ep_free_request(&ci->ep0in->ep, ci->status);
 839                 ci->status = NULL;
 840         }
 841
 842         spin_lock_irqsave(&ci->lock, flags);
 843         ci->gadget.speed = USB_SPEED_UNKNOWN;
 844         ci->remote_wakeup = 0;
 845         ci->suspended = 0;
 846         spin_unlock_irqrestore(&ci->lock, flags);
 847
 848         return 0;
 849 }
 850
 851 /******************************************************************************
 852  * ISR block
 853  *****************************************************************************/
 854 /**
 855  * isr_reset_handler: USB reset interrupt handler
 856  * @ci: UDC device
 857  *
 858  * This function resets USB engine after a bus reset occurred
 859  */
 860 static void isr_reset_handler(struct ci_hdrc *ci)
 861 __releases(ci->lock)
 862 __acquires(ci->lock)
 863 {
 864         int retval;
 865
 866         spin_unlock(&ci->lock);
 867         if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 868                 usb_gadget_udc_reset(&ci->gadget, ci->driver);
 869
 870         retval = _gadget_stop_activity(&ci->gadget);
 871         if (retval)
 872                 goto done;
 873
 874         retval = hw_usb_reset(ci);
 875         if (retval)
 876                 goto done;
 877
 878         ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 879         if (ci->status == NULL)
 880                 retval = -ENOMEM;
 881
 882 done:
 883         spin_lock(&ci->lock);
 884
 885         if (retval)
 886                 dev_err(ci->dev, "error: %i\n", retval);
 887 }
 888
 889 /**
 890  * isr_get_status_complete: get_status request complete function
 891  * @ep:  endpoint
 892  * @req: request handled
 893  *
 894  * Caller must release lock
 895  */
 896 static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 897 {
 898         if (ep == NULL || req == NULL)
 899                 return;
 900
 901         kfree(req->buf);
 902         usb_ep_free_request(ep, req);
 903 }
 904
 905 /**
 906  * _ep_queue: queues (submits) an I/O request to an endpoint
 907  * @ep:        endpoint
 908  * @req:       request
 909  * @gfp_flags: GFP flags (not used)
 910  *
 911  * Caller must hold lock
 912  * This function returns an error code
 913  */
 914 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 915                     gfp_t __maybe_unused gfp_flags)
 916 {
 917         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 918         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 919         struct ci_hdrc *ci = hwep->ci;
 920         int retval = 0;
 921
 922         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 923                 return -EINVAL;
 924
 925         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 926                 if (req->length)
 927                         hwep = (ci->ep0_dir == RX) ?
 928                                ci->ep0out : ci->ep0in;
 929                 if (!list_empty(&hwep->qh.queue)) {
 930                         _ep_nuke(hwep);
 931                         dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 932                                  _usb_addr(hwep));
 933                 }
 934         }
 935
 936         if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 937             hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
 938                 dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 939                 return -EMSGSIZE;
 940         }
 941
 942         /* first nuke then test link, e.g. previous status has not sent */
 943         if (!list_empty(&hwreq->queue)) {
 944                 dev_err(hwep->ci->dev, "request already in queue\n");
 945                 return -EBUSY;
 946         }
 947
 948         /* push request */
 949         hwreq->req.status = -EINPROGRESS;
 950         hwreq->req.actual = 0;
 951
 952         retval = _hardware_enqueue(hwep, hwreq);
 953
 954         if (retval == -EALREADY)
 955                 retval = 0;
 956         if (!retval)
 957                 list_add_tail(&hwreq->queue, &hwep->qh.queue);
 958
 959         return retval;
 960 }
 961
 962 /**
 963  * isr_get_status_response: get_status request response
 964  * @ci: ci struct
 965  * @setup: setup request packet
 966  *
 967  * This function returns an error code
 968  */
 969 static int isr_get_status_response(struct ci_hdrc *ci,
 970                                    struct usb_ctrlrequest *setup)
 971 __releases(hwep->lock)
 972 __acquires(hwep->lock)
 973 {
 974         struct ci_hw_ep *hwep = ci->ep0in;
 975         struct usb_request *req = NULL;
 976         gfp_t gfp_flags = GFP_ATOMIC;
 977         int dir, num, retval;
 978
 979         if (hwep == NULL || setup == NULL)
 980                 return -EINVAL;
 981
 982         spin_unlock(hwep->lock);
 983         req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 984         spin_lock(hwep->lock);
 985         if (req == NULL)
 986                 return -ENOMEM;
 987
 988         req->complete = isr_get_status_complete;
 989         req->length   = 2;
 990         req->buf      = kzalloc(req->length, gfp_flags);
 991         if (req->buf == NULL) {
 992                 retval = -ENOMEM;
 993                 goto err_free_req;
 994         }
 995
 996         if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
 997                 *(u16 *)req->buf = (ci->remote_wakeup << 1) |
 998                         ci->gadget.is_selfpowered;
 999         } else if ((setup->bRequestType & USB_RECIP_MASK) \
1000                    == USB_RECIP_ENDPOINT) {
1001                 dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
1002                         TX : RX;
1003                 num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
1004                 *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
1005         }
1006         /* else do nothing; reserved for future use */
1007
1008         retval = _ep_queue(&hwep->ep, req, gfp_flags);
1009         if (retval)
1010                 goto err_free_buf;
1011
1012         return 0;
1013
1014  err_free_buf:
1015         kfree(req->buf);
1016  err_free_req:
1017         spin_unlock(hwep->lock);
1018         usb_ep_free_request(&hwep->ep, req);
1019         spin_lock(hwep->lock);
1020         return retval;
1021 }
1022
1023 /**
1024  * isr_setup_status_complete: setup_status request complete function
1025  * @ep:  endpoint
1026  * @req: request handled
1027  *
1028  * Caller must release lock. Put the port in test mode if test mode
1029  * feature is selected.
1030  */
1031 static void
1032 isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
1033 {
1034         struct ci_hdrc *ci = req->context;
1035         unsigned long flags;
1036
1037         if (req->status < 0)
1038                 return;
1039
1040         if (ci->setaddr) {
1041                 hw_usb_set_address(ci, ci->address);
1042                 ci->setaddr = false;
1043                 if (ci->address)
1044                         usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
1045         }
1046
1047         spin_lock_irqsave(&ci->lock, flags);
1048         if (ci->test_mode)
1049                 hw_port_test_set(ci, ci->test_mode);
1050         spin_unlock_irqrestore(&ci->lock, flags);
1051 }
1052
1053 /**
1054  * isr_setup_status_phase: queues the status phase of a setup transation
1055  * @ci: ci struct
1056  *
1057  * This function returns an error code
1058  */
1059 static int isr_setup_status_phase(struct ci_hdrc *ci)
1060 {
1061         struct ci_hw_ep *hwep;
1062
1063         /*
1064          * Unexpected USB controller behavior, caused by bad signal integrity
1065          * or ground reference problems, can lead to isr_setup_status_phase
1066          * being called with ci->status equal to NULL.
1067          * If this situation occurs, you should review your USB hardware design.
1068          */
1069         if (WARN_ON_ONCE(!ci->status))
1070                 return -EPIPE;
1071
1072         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
1073         ci->status->context = ci;
1074         ci->status->complete = isr_setup_status_complete;
1075
1076         return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
1077 }
1078
1079 /**
1080  * isr_tr_complete_low: transaction complete low level handler
1081  * @hwep: endpoint
1082  *
1083  * This function returns an error code
1084  * Caller must hold lock
1085  */
1086 static int isr_tr_complete_low(struct ci_hw_ep *hwep)
1087 __releases(hwep->lock)
1088 __acquires(hwep->lock)
1089 {
1090         struct ci_hw_req *hwreq, *hwreqtemp;
1091         struct ci_hw_ep *hweptemp = hwep;
1092         int retval = 0;
1093
1094         list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
1095                         queue) {
1096                 retval = _hardware_dequeue(hwep, hwreq);
1097                 if (retval < 0)
1098                         break;
1099                 list_del_init(&hwreq->queue);
1100                 if (hwreq->req.complete != NULL) {
1101                         spin_unlock(hwep->lock);
1102                         if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
1103                                         hwreq->req.length)
1104                                 hweptemp = hwep->ci->ep0in;
1105                         usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
1106                         spin_lock(hwep->lock);
1107                 }
1108         }
1109
1110         if (retval == -EBUSY)
1111                 retval = 0;
1112
1113         return retval;
1114 }
1115
1116 static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1117 {
1118         dev_warn(&ci->gadget.dev,
1119                 "connect the device to an alternate port if you want HNP\n");
1120         return isr_setup_status_phase(ci);
1121 }
1122
1123 /**
1124  * isr_setup_packet_handler: setup packet handler
1125  * @ci: UDC descriptor
1126  *
1127  * This function handles setup packet
1128  */
1129 static void isr_setup_packet_handler(struct ci_hdrc *ci)
1130 __releases(ci->lock)
1131 __acquires(ci->lock)
1132 {
1133         struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1134         struct usb_ctrlrequest req;
1135         int type, num, dir, err = -EINVAL;
1136         u8 tmode = 0;
1137
1138         /*
1139          * Flush data and handshake transactions of previous
1140          * setup packet.
1141          */
1142         _ep_nuke(ci->ep0out);
1143         _ep_nuke(ci->ep0in);
1144
1145         /* read_setup_packet */
1146         do {
1147                 hw_test_and_set_setup_guard(ci);
1148                 memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1149         } while (!hw_test_and_clear_setup_guard(ci));
1150
1151         type = req.bRequestType;
1152
1153         ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1154
1155         switch (req.bRequest) {
1156         case USB_REQ_CLEAR_FEATURE:
1157                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1158                                 le16_to_cpu(req.wValue) ==
1159                                 USB_ENDPOINT_HALT) {
1160                         if (req.wLength != 0)
1161                                 break;
1162                         num  = le16_to_cpu(req.wIndex);
1163                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1164                         num &= USB_ENDPOINT_NUMBER_MASK;
1165                         if (dir == TX)
1166                                 num += ci->hw_ep_max / 2;
1167                         if (!ci->ci_hw_ep[num].wedge) {
1168                                 spin_unlock(&ci->lock);
1169                                 err = usb_ep_clear_halt(
1170                                         &ci->ci_hw_ep[num].ep);
1171                                 spin_lock(&ci->lock);
1172                                 if (err)
1173                                         break;
1174                         }
1175                         err = isr_setup_status_phase(ci);
1176                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1177                                 le16_to_cpu(req.wValue) ==
1178                                 USB_DEVICE_REMOTE_WAKEUP) {
1179                         if (req.wLength != 0)
1180                                 break;
1181                         ci->remote_wakeup = 0;
1182                         err = isr_setup_status_phase(ci);
1183                 } else {
1184                         goto delegate;
1185                 }
1186                 break;
1187         case USB_REQ_GET_STATUS:
1188                 if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1189                         le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1190                     type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1191                     type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1192                         goto delegate;
1193                 if (le16_to_cpu(req.wLength) != 2 ||
1194                     le16_to_cpu(req.wValue)  != 0)
1195                         break;
1196                 err = isr_get_status_response(ci, &req);
1197                 break;
1198         case USB_REQ_SET_ADDRESS:
1199                 if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1200                         goto delegate;
1201                 if (le16_to_cpu(req.wLength) != 0 ||
1202                     le16_to_cpu(req.wIndex)  != 0)
1203                         break;
1204                 ci->address = (u8)le16_to_cpu(req.wValue);
1205                 ci->setaddr = true;
1206                 err = isr_setup_status_phase(ci);
1207                 break;
1208         case USB_REQ_SET_FEATURE:
1209                 if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1210                                 le16_to_cpu(req.wValue) ==
1211                                 USB_ENDPOINT_HALT) {
1212                         if (req.wLength != 0)
1213                                 break;
1214                         num  = le16_to_cpu(req.wIndex);
1215                         dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1216                         num &= USB_ENDPOINT_NUMBER_MASK;
1217                         if (dir == TX)
1218                                 num += ci->hw_ep_max / 2;
1219
1220                         spin_unlock(&ci->lock);
1221                         err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1222                         spin_lock(&ci->lock);
1223                         if (!err)
1224                                 isr_setup_status_phase(ci);
1225                 } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1226                         if (req.wLength != 0)
1227                                 break;
1228                         switch (le16_to_cpu(req.wValue)) {
1229                         case USB_DEVICE_REMOTE_WAKEUP:
1230                                 ci->remote_wakeup = 1;
1231                                 err = isr_setup_status_phase(ci);
1232                                 break;
1233                         case USB_DEVICE_TEST_MODE:
1234                                 tmode = le16_to_cpu(req.wIndex) >> 8;
1235                                 switch (tmode) {
1236                                 case USB_TEST_J:
1237                                 case USB_TEST_K:
1238                                 case USB_TEST_SE0_NAK:
1239                                 case USB_TEST_PACKET:
1240                                 case USB_TEST_FORCE_ENABLE:
1241                                         ci->test_mode = tmode;
1242                                         err = isr_setup_status_phase(
1243                                                         ci);
1244                                         break;
1245                                 default:
1246                                         break;
1247                                 }
1248                                 break;
1249                         case USB_DEVICE_B_HNP_ENABLE:
1250                                 if (ci_otg_is_fsm_mode(ci)) {
1251                                         ci->gadget.b_hnp_enable = 1;
1252                                         err = isr_setup_status_phase(
1253                                                         ci);
1254                                 }
1255                                 break;
1256                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1257                                 if (ci_otg_is_fsm_mode(ci))
1258                                         err = otg_a_alt_hnp_support(ci);
1259                                 break;
1260                         case USB_DEVICE_A_HNP_SUPPORT:
1261                                 if (ci_otg_is_fsm_mode(ci)) {
1262                                         ci->gadget.a_hnp_support = 1;
1263                                         err = isr_setup_status_phase(
1264                                                         ci);
1265                                 }
1266                                 break;
1267                         default:
1268                                 goto delegate;
1269                         }
1270                 } else {
1271                         goto delegate;
1272                 }
1273                 break;
1274         default:
1275 delegate:
1276                 if (req.wLength == 0)   /* no data phase */
1277                         ci->ep0_dir = TX;
1278
1279                 spin_unlock(&ci->lock);
1280                 err = ci->driver->setup(&ci->gadget, &req);
1281                 spin_lock(&ci->lock);
1282                 break;
1283         }
1284
1285         if (err < 0) {
1286                 spin_unlock(&ci->lock);
1287                 if (_ep_set_halt(&hwep->ep, 1, false))
1288                         dev_err(ci->dev, "error: _ep_set_halt\n");
1289                 spin_lock(&ci->lock);
1290         }
1291 }
1292
1293 /**
1294  * isr_tr_complete_handler: transaction complete interrupt handler
1295  * @ci: UDC descriptor
1296  *
1297  * This function handles traffic events
1298  */
1299 static void isr_tr_complete_handler(struct ci_hdrc *ci)
1300 __releases(ci->lock)
1301 __acquires(ci->lock)
1302 {
1303         unsigned i;
1304         int err;
1305
1306         for (i = 0; i < ci->hw_ep_max; i++) {
1307                 struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1308
1309                 if (hwep->ep.desc == NULL)
1310                         continue;   /* not configured */
1311
1312                 if (hw_test_and_clear_complete(ci, i)) {
1313                         err = isr_tr_complete_low(hwep);
1314                         if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1315                                 if (err > 0)   /* needs status phase */
1316                                         err = isr_setup_status_phase(ci);
1317                                 if (err < 0) {
1318                                         spin_unlock(&ci->lock);
1319                                         if (_ep_set_halt(&hwep->ep, 1, false))
1320                                                 dev_err(ci->dev,
1321                                                 "error: _ep_set_halt\n");
1322                                         spin_lock(&ci->lock);
1323                                 }
1324                         }
1325                 }
1326
1327                 /* Only handle setup packet below */
1328                 if (i == 0 &&
1329                         hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1330                         isr_setup_packet_handler(ci);
1331         }
1332 }
1333
1334 /******************************************************************************
1335  * ENDPT block
1336  *****************************************************************************/
1337 /*
1338  * ep_enable: configure endpoint, making it usable
1339  *
1340  * Check usb_ep_enable() at "usb_gadget.h" for details
1341  */
1342 static int ep_enable(struct usb_ep *ep,
1343                      const struct usb_endpoint_descriptor *desc)
1344 {
1345         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1346         int retval = 0;
1347         unsigned long flags;
1348         u32 cap = 0;
1349
1350         if (ep == NULL || desc == NULL)
1351                 return -EINVAL;
1352
1353         spin_lock_irqsave(hwep->lock, flags);
1354
1355         /* only internal SW should enable ctrl endpts */
1356
1357         if (!list_empty(&hwep->qh.queue)) {
1358                 dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1359                 spin_unlock_irqrestore(hwep->lock, flags);
1360                 return -EBUSY;
1361         }
1362
1363         hwep->ep.desc = desc;
1364
1365         hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1366         hwep->num  = usb_endpoint_num(desc);
1367         hwep->type = usb_endpoint_type(desc);
1368
1369         hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1370         hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1371
1372         if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1373                 cap |= QH_IOS;
1374
1375         cap |= QH_ZLT;
1376         cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1377         /*
1378          * For ISO-TX, we set mult at QH as the largest value, and use
1379          * MultO at TD as real mult value.
1380          */
1381         if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1382                 cap |= 3 << __ffs(QH_MULT);
1383
1384         hwep->qh.ptr->cap = cpu_to_le32(cap);
1385
1386         hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1387
1388         if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1389                 dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1390                 retval = -EINVAL;
1391         }
1392
1393         /*
1394          * Enable endpoints in the HW other than ep0 as ep0
1395          * is always enabled
1396          */
1397         if (hwep->num)
1398                 retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1399                                        hwep->type);
1400
1401         spin_unlock_irqrestore(hwep->lock, flags);
1402         return retval;
1403 }
1404
1405 /*
1406  * ep_disable: endpoint is no longer usable
1407  *
1408  * Check usb_ep_disable() at "usb_gadget.h" for details
1409  */
1410 static int ep_disable(struct usb_ep *ep)
1411 {
1412         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1413         int direction, retval = 0;
1414         unsigned long flags;
1415
1416         if (ep == NULL)
1417                 return -EINVAL;
1418         else if (hwep->ep.desc == NULL)
1419                 return -EBUSY;
1420
1421         spin_lock_irqsave(hwep->lock, flags);
1422         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1423                 spin_unlock_irqrestore(hwep->lock, flags);
1424                 return 0;
1425         }
1426
1427         /* only internal SW should disable ctrl endpts */
1428
1429         direction = hwep->dir;
1430         do {
1431                 retval |= _ep_nuke(hwep);
1432                 retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1433
1434                 if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1435                         hwep->dir = (hwep->dir == TX) ? RX : TX;
1436
1437         } while (hwep->dir != direction);
1438
1439         hwep->ep.desc = NULL;
1440
1441         spin_unlock_irqrestore(hwep->lock, flags);
1442         return retval;
1443 }
1444
1445 /*
1446  * ep_alloc_request: allocate a request object to use with this endpoint
1447  *
1448  * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1449  */
1450 static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1451 {
1452         struct ci_hw_req *hwreq = NULL;
1453
1454         if (ep == NULL)
1455                 return NULL;
1456
1457         hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1458         if (hwreq != NULL) {
1459                 INIT_LIST_HEAD(&hwreq->queue);
1460                 INIT_LIST_HEAD(&hwreq->tds);
1461         }
1462
1463         return (hwreq == NULL) ? NULL : &hwreq->req;
1464 }
1465
1466 /*
1467  * ep_free_request: frees a request object
1468  *
1469  * Check usb_ep_free_request() at "usb_gadget.h" for details
1470  */
1471 static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1472 {
1473         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1474         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1475         struct td_node *node, *tmpnode;
1476         unsigned long flags;
1477
1478         if (ep == NULL || req == NULL) {
1479                 return;
1480         } else if (!list_empty(&hwreq->queue)) {
1481                 dev_err(hwep->ci->dev, "freeing queued request\n");
1482                 return;
1483         }
1484
1485         spin_lock_irqsave(hwep->lock, flags);
1486
1487         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1488                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1489                 list_del_init(&node->td);
1490                 node->ptr = NULL;
1491                 kfree(node);
1492         }
1493
1494         kfree(hwreq);
1495
1496         spin_unlock_irqrestore(hwep->lock, flags);
1497 }
1498
1499 /*
1500  * ep_queue: queues (submits) an I/O request to an endpoint
1501  *
1502  * Check usb_ep_queue()* at usb_gadget.h" for details
1503  */
1504 static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1505                     gfp_t __maybe_unused gfp_flags)
1506 {
1507         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1508         int retval = 0;
1509         unsigned long flags;
1510
1511         if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1512                 return -EINVAL;
1513
1514         spin_lock_irqsave(hwep->lock, flags);
1515         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1516                 spin_unlock_irqrestore(hwep->lock, flags);
1517                 return 0;
1518         }
1519         retval = _ep_queue(ep, req, gfp_flags);
1520         spin_unlock_irqrestore(hwep->lock, flags);
1521         return retval;
1522 }
1523
1524 /*
1525  * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1526  *
1527  * Check usb_ep_dequeue() at "usb_gadget.h" for details
1528  */
1529 static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1530 {
1531         struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1532         struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1533         unsigned long flags;
1534         struct td_node *node, *tmpnode;
1535
1536         if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1537                 hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1538                 list_empty(&hwep->qh.queue))
1539                 return -EINVAL;
1540
1541         spin_lock_irqsave(hwep->lock, flags);
1542         if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN)
1543                 hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1544
1545         list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1546                 dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1547                 list_del(&node->td);
1548                 kfree(node);
1549         }
1550
1551         /* pop request */
1552         list_del_init(&hwreq->queue);
1553
1554         usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1555
1556         req->status = -ECONNRESET;
1557
1558         if (hwreq->req.complete != NULL) {
1559                 spin_unlock(hwep->lock);
1560                 usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1561                 spin_lock(hwep->lock);
1562         }
1563
1564         spin_unlock_irqrestore(hwep->lock, flags);
1565         return 0;
1566 }
1567
1568 /*
1569  * ep_set_halt: sets the endpoint halt feature
1570  *
1571  * Check usb_ep_set_halt() at "usb_gadget.h" for details
1572  */
1573 static int ep_set_halt(struct usb_ep *ep, int value)
1574 {
1575         return _ep_set_halt(ep, value, true);
1576 }
1577
1578 /*
1579  * ep_set_wedge: sets the halt feature and ignores clear requests
1580  *
1581  * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1582  */
1583 static int ep_set_wedge(struct usb_ep *ep)
1584 {
1585         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1586         unsigned long flags;
1587
1588         if (ep == NULL || hwep->ep.desc == NULL)
1589                 return -EINVAL;
1590
1591         spin_lock_irqsave(hwep->lock, flags);
1592         hwep->wedge = 1;
1593         spin_unlock_irqrestore(hwep->lock, flags);
1594
1595         return usb_ep_set_halt(ep);
1596 }
1597
1598 /*
1599  * ep_fifo_flush: flushes contents of a fifo
1600  *
1601  * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1602  */
1603 static void ep_fifo_flush(struct usb_ep *ep)
1604 {
1605         struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1606         unsigned long flags;
1607
1608         if (ep == NULL) {
1609                 dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1610                 return;
1611         }
1612
1613         spin_lock_irqsave(hwep->lock, flags);
1614         if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
1615                 spin_unlock_irqrestore(hwep->lock, flags);
1616                 return;
1617         }
1618
1619         hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1620
1621         spin_unlock_irqrestore(hwep->lock, flags);
1622 }
1623
1624 /*
1625  * Endpoint-specific part of the API to the USB controller hardware
1626  * Check "usb_gadget.h" for details
1627  */
1628 static const struct usb_ep_ops usb_ep_ops = {
1629         .enable        = ep_enable,
1630         .disable       = ep_disable,
1631         .alloc_request = ep_alloc_request,
1632         .free_request  = ep_free_request,
1633         .queue         = ep_queue,
1634         .dequeue       = ep_dequeue,
1635         .set_halt      = ep_set_halt,
1636         .set_wedge     = ep_set_wedge,
1637         .fifo_flush    = ep_fifo_flush,
1638 };
1639
1640 /******************************************************************************
1641  * GADGET block
1642  *****************************************************************************/
1643 /*
1644  * ci_hdrc_gadget_connect: caller makes sure gadget driver is binded
1645  */
1646 static void ci_hdrc_gadget_connect(struct usb_gadget *_gadget, int is_active)
1647 {
1648         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1649
1650         if (is_active) {
1651                 pm_runtime_get_sync(ci->dev);
1652                 hw_device_reset(ci);
1653                 spin_lock_irq(&ci->lock);
1654                 if (ci->driver) {
1655                         hw_device_state(ci, ci->ep0out->qh.dma);
1656                         usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1657                         spin_unlock_irq(&ci->lock);
1658                         usb_udc_vbus_handler(_gadget, true);
1659                 } else {
1660                         spin_unlock_irq(&ci->lock);
1661                 }
1662         } else {
1663                 usb_udc_vbus_handler(_gadget, false);
1664                 if (ci->driver)
1665                         ci->driver->disconnect(&ci->gadget);
1666                 hw_device_state(ci, 0);
1667                 if (ci->platdata->notify_event)
1668                         ci->platdata->notify_event(ci,
1669                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1670                 _gadget_stop_activity(&ci->gadget);
1671                 pm_runtime_put_sync(ci->dev);
1672                 usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1673         }
1674 }
1675
1676 static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1677 {
1678         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1679         unsigned long flags;
1680         int ret = 0;
1681
1682         spin_lock_irqsave(&ci->lock, flags);
1683         ci->vbus_active = is_active;
1684         spin_unlock_irqrestore(&ci->lock, flags);
1685
1686         if (ci->usb_phy)
1687                 usb_phy_set_charger_state(ci->usb_phy, is_active ?
1688                         USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
1689
1690         if (ci->platdata->notify_event)
1691                 ret = ci->platdata->notify_event(ci,
1692                                 CI_HDRC_CONTROLLER_VBUS_EVENT);
1693
1694         if (ci->driver)
1695                 ci_hdrc_gadget_connect(_gadget, is_active);
1696
1697         return ret;
1698 }
1699
1700 static int ci_udc_wakeup(struct usb_gadget *_gadget)
1701 {
1702         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1703         unsigned long flags;
1704         int ret = 0;
1705
1706         spin_lock_irqsave(&ci->lock, flags);
1707         if (ci->gadget.speed == USB_SPEED_UNKNOWN) {
1708                 spin_unlock_irqrestore(&ci->lock, flags);
1709                 return 0;
1710         }
1711         if (!ci->remote_wakeup) {
1712                 ret = -EOPNOTSUPP;
1713                 goto out;
1714         }
1715         if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1716                 ret = -EINVAL;
1717                 goto out;
1718         }
1719         hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1720 out:
1721         spin_unlock_irqrestore(&ci->lock, flags);
1722         return ret;
1723 }
1724
1725 static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1726 {
1727         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1728
1729         if (ci->usb_phy)
1730                 return usb_phy_set_power(ci->usb_phy, ma);
1731         return -ENOTSUPP;
1732 }
1733
1734 static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1735 {
1736         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1737         struct ci_hw_ep *hwep = ci->ep0in;
1738         unsigned long flags;
1739
1740         spin_lock_irqsave(hwep->lock, flags);
1741         _gadget->is_selfpowered = (is_on != 0);
1742         spin_unlock_irqrestore(hwep->lock, flags);
1743
1744         return 0;
1745 }
1746
1747 /* Change Data+ pullup status
1748  * this func is used by usb_gadget_connect/disconnect
1749  */
1750 static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1751 {
1752         struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1753
1754         /*
1755          * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1756          * and don't touch Data+ in host mode for dual role config.
1757          */
1758         if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1759                 return 0;
1760
1761         pm_runtime_get_sync(ci->dev);
1762         if (is_on)
1763                 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1764         else
1765                 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1766         pm_runtime_put_sync(ci->dev);
1767
1768         return 0;
1769 }
1770
1771 static int ci_udc_start(struct usb_gadget *gadget,
1772                          struct usb_gadget_driver *driver);
1773 static int ci_udc_stop(struct usb_gadget *gadget);
1774
1775 /* Match ISOC IN from the highest endpoint */
1776 static struct usb_ep *ci_udc_match_ep(struct usb_gadget *gadget,
1777                               struct usb_endpoint_descriptor *desc,
1778                               struct usb_ss_ep_comp_descriptor *comp_desc)
1779 {
1780         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1781         struct usb_ep *ep;
1782
1783         if (usb_endpoint_xfer_isoc(desc) && usb_endpoint_dir_in(desc)) {
1784                 list_for_each_entry_reverse(ep, &ci->gadget.ep_list, ep_list) {
1785                         if (ep->caps.dir_in && !ep->claimed)
1786                                 return ep;
1787                 }
1788         }
1789
1790         return NULL;
1791 }
1792
1793 /*
1794  * Device operations part of the API to the USB controller hardware,
1795  * which don't involve endpoints (or i/o)
1796  * Check  "usb_gadget.h" for details
1797  */
1798 static const struct usb_gadget_ops usb_gadget_ops = {
1799         .vbus_session   = ci_udc_vbus_session,
1800         .wakeup         = ci_udc_wakeup,
1801         .set_selfpowered        = ci_udc_selfpowered,
1802         .pullup         = ci_udc_pullup,
1803         .vbus_draw      = ci_udc_vbus_draw,
1804         .udc_start      = ci_udc_start,
1805         .udc_stop       = ci_udc_stop,
1806         .match_ep       = ci_udc_match_ep,
1807 };
1808
1809 static int init_eps(struct ci_hdrc *ci)
1810 {
1811         int retval = 0, i, j;
1812
1813         for (i = 0; i < ci->hw_ep_max/2; i++)
1814                 for (j = RX; j <= TX; j++) {
1815                         int k = i + j * ci->hw_ep_max/2;
1816                         struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1817
1818                         scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1819                                         (j == TX)  ? "in" : "out");
1820
1821                         hwep->ci          = ci;
1822                         hwep->lock         = &ci->lock;
1823                         hwep->td_pool      = ci->td_pool;
1824
1825                         hwep->ep.name      = hwep->name;
1826                         hwep->ep.ops       = &usb_ep_ops;
1827
1828                         if (i == 0) {
1829                                 hwep->ep.caps.type_control = true;
1830                         } else {
1831                                 hwep->ep.caps.type_iso = true;
1832                                 hwep->ep.caps.type_bulk = true;
1833                                 hwep->ep.caps.type_int = true;
1834                         }
1835
1836                         if (j == TX)
1837                                 hwep->ep.caps.dir_in = true;
1838                         else
1839                                 hwep->ep.caps.dir_out = true;
1840
1841                         /*
1842                          * for ep0: maxP defined in desc, for other
1843                          * eps, maxP is set by epautoconfig() called
1844                          * by gadget layer
1845                          */
1846                         usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1847
1848                         INIT_LIST_HEAD(&hwep->qh.queue);
1849                         hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1850                                                        &hwep->qh.dma);
1851                         if (hwep->qh.ptr == NULL)
1852                                 retval = -ENOMEM;
1853
1854                         /*
1855                          * set up shorthands for ep0 out and in endpoints,
1856                          * don't add to gadget's ep_list
1857                          */
1858                         if (i == 0) {
1859                                 if (j == RX)
1860                                         ci->ep0out = hwep;
1861                                 else
1862                                         ci->ep0in = hwep;
1863
1864                                 usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1865                                 continue;
1866                         }
1867
1868                         list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1869                 }
1870
1871         return retval;
1872 }
1873
1874 static void destroy_eps(struct ci_hdrc *ci)
1875 {
1876         int i;
1877
1878         for (i = 0; i < ci->hw_ep_max; i++) {
1879                 struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1880
1881                 if (hwep->pending_td)
1882                         free_pending_td(hwep);
1883                 dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1884         }
1885 }
1886
1887 /**
1888  * ci_udc_start: register a gadget driver
1889  * @gadget: our gadget
1890  * @driver: the driver being registered
1891  *
1892  * Interrupts are enabled here.
1893  */
1894 static int ci_udc_start(struct usb_gadget *gadget,
1895                          struct usb_gadget_driver *driver)
1896 {
1897         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1898         int retval;
1899
1900         if (driver->disconnect == NULL)
1901                 return -EINVAL;
1902
1903         ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1904         retval = usb_ep_enable(&ci->ep0out->ep);
1905         if (retval)
1906                 return retval;
1907
1908         ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1909         retval = usb_ep_enable(&ci->ep0in->ep);
1910         if (retval)
1911                 return retval;
1912
1913         ci->driver = driver;
1914
1915         /* Start otg fsm for B-device */
1916         if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1917                 ci_hdrc_otg_fsm_start(ci);
1918                 return retval;
1919         }
1920
1921         if (ci->vbus_active)
1922                 ci_hdrc_gadget_connect(gadget, 1);
1923         else
1924                 usb_udc_vbus_handler(&ci->gadget, false);
1925
1926         return retval;
1927 }
1928
1929 static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1930 {
1931         if (!ci_otg_is_fsm_mode(ci))
1932                 return;
1933
1934         mutex_lock(&ci->fsm.lock);
1935         if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1936                 ci->fsm.a_bidl_adis_tmout = 1;
1937                 ci_hdrc_otg_fsm_start(ci);
1938         } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1939                 ci->fsm.protocol = PROTO_UNDEF;
1940                 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1941         }
1942         mutex_unlock(&ci->fsm.lock);
1943 }
1944
1945 /*
1946  * ci_udc_stop: unregister a gadget driver
1947  */
1948 static int ci_udc_stop(struct usb_gadget *gadget)
1949 {
1950         struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1951         unsigned long flags;
1952
1953         spin_lock_irqsave(&ci->lock, flags);
1954         ci->driver = NULL;
1955
1956         if (ci->vbus_active) {
1957                 hw_device_state(ci, 0);
1958                 spin_unlock_irqrestore(&ci->lock, flags);
1959                 if (ci->platdata->notify_event)
1960                         ci->platdata->notify_event(ci,
1961                         CI_HDRC_CONTROLLER_STOPPED_EVENT);
1962                 _gadget_stop_activity(&ci->gadget);
1963                 spin_lock_irqsave(&ci->lock, flags);
1964                 pm_runtime_put(ci->dev);
1965         }
1966
1967         spin_unlock_irqrestore(&ci->lock, flags);
1968
1969         ci_udc_stop_for_otg_fsm(ci);
1970         return 0;
1971 }
1972
1973 /******************************************************************************
1974  * BUS block
1975  *****************************************************************************/
1976 /*
1977  * udc_irq: ci interrupt handler
1978  *
1979  * This function returns IRQ_HANDLED if the IRQ has been handled
1980  * It locks access to registers
1981  */
1982 static irqreturn_t udc_irq(struct ci_hdrc *ci)
1983 {
1984         irqreturn_t retval;
1985         u32 intr;
1986
1987         if (ci == NULL)
1988                 return IRQ_HANDLED;
1989
1990         spin_lock(&ci->lock);
1991
1992         if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1993                 if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1994                                 USBMODE_CM_DC) {
1995                         spin_unlock(&ci->lock);
1996                         return IRQ_NONE;
1997                 }
1998         }
1999         intr = hw_test_and_clear_intr_active(ci);
2000
2001         if (intr) {
2002                 /* order defines priority - do NOT change it */
2003                 if (USBi_URI & intr)
2004                         isr_reset_handler(ci);
2005
2006                 if (USBi_PCI & intr) {
2007                         ci->gadget.speed = hw_port_is_high_speed(ci) ?
2008                                 USB_SPEED_HIGH : USB_SPEED_FULL;
2009                         if (ci->suspended) {
2010                                 if (ci->driver->resume) {
2011                                         spin_unlock(&ci->lock);
2012                                         ci->driver->resume(&ci->gadget);
2013                                         spin_lock(&ci->lock);
2014                                 }
2015                                 ci->suspended = 0;
2016                                 usb_gadget_set_state(&ci->gadget,
2017                                                 ci->resume_state);
2018                         }
2019                 }
2020
2021                 if (USBi_UI  & intr)
2022                         isr_tr_complete_handler(ci);
2023
2024                 if ((USBi_SLI & intr) && !(ci->suspended)) {
2025                         ci->suspended = 1;
2026                         ci->resume_state = ci->gadget.state;
2027                         if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
2028                             ci->driver->suspend) {
2029                                 spin_unlock(&ci->lock);
2030                                 ci->driver->suspend(&ci->gadget);
2031                                 spin_lock(&ci->lock);
2032                         }
2033                         usb_gadget_set_state(&ci->gadget,
2034                                         USB_STATE_SUSPENDED);
2035                 }
2036                 retval = IRQ_HANDLED;
2037         } else {
2038                 retval = IRQ_NONE;
2039         }
2040         spin_unlock(&ci->lock);
2041
2042         return retval;
2043 }
2044
2045 /**
2046  * udc_start: initialize gadget role
2047  * @ci: chipidea controller
2048  */
2049 static int udc_start(struct ci_hdrc *ci)
2050 {
2051         struct device *dev = ci->dev;
2052         struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
2053         int retval = 0;
2054
2055         ci->gadget.ops          = &usb_gadget_ops;
2056         ci->gadget.speed        = USB_SPEED_UNKNOWN;
2057         ci->gadget.max_speed    = USB_SPEED_HIGH;
2058         ci->gadget.name         = ci->platdata->name;
2059         ci->gadget.otg_caps     = otg_caps;
2060         ci->gadget.sg_supported = 1;
2061         ci->gadget.irq          = ci->irq;
2062
2063         if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
2064                 ci->gadget.quirk_avoids_skb_reserve = 1;
2065
2066         if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
2067                                                 otg_caps->adp_support))
2068                 ci->gadget.is_otg = 1;
2069
2070         INIT_LIST_HEAD(&ci->gadget.ep_list);
2071
2072         /* alloc resources */
2073         ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
2074                                        sizeof(struct ci_hw_qh),
2075                                        64, CI_HDRC_PAGE_SIZE);
2076         if (ci->qh_pool == NULL)
2077                 return -ENOMEM;
2078
2079         ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
2080                                        sizeof(struct ci_hw_td),
2081                                        64, CI_HDRC_PAGE_SIZE);
2082         if (ci->td_pool == NULL) {
2083                 retval = -ENOMEM;
2084                 goto free_qh_pool;
2085         }
2086
2087         retval = init_eps(ci);
2088         if (retval)
2089                 goto free_pools;
2090
2091         ci->gadget.ep0 = &ci->ep0in->ep;
2092
2093         retval = usb_add_gadget_udc(dev, &ci->gadget);
2094         if (retval)
2095                 goto destroy_eps;
2096
2097         return retval;
2098
2099 destroy_eps:
2100         destroy_eps(ci);
2101 free_pools:
2102         dma_pool_destroy(ci->td_pool);
2103 free_qh_pool:
2104         dma_pool_destroy(ci->qh_pool);
2105         return retval;
2106 }
2107
2108 /*
2109  * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
2110  *
2111  * No interrupts active, the IRQ has been released
2112  */
2113 void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
2114 {
2115         if (!ci->roles[CI_ROLE_GADGET])
2116                 return;
2117
2118         usb_del_gadget_udc(&ci->gadget);
2119
2120         destroy_eps(ci);
2121
2122         dma_pool_destroy(ci->td_pool);
2123         dma_pool_destroy(ci->qh_pool);
2124 }
2125
2126 static int udc_id_switch_for_device(struct ci_hdrc *ci)
2127 {
2128         if (ci->platdata->pins_device)
2129                 pinctrl_select_state(ci->platdata->pctl,
2130                                      ci->platdata->pins_device);
2131
2132         if (ci->is_otg)
2133                 /* Clear and enable BSV irq */
2134                 hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
2135                                         OTGSC_BSVIS | OTGSC_BSVIE);
2136
2137         return 0;
2138 }
2139
2140 static void udc_id_switch_for_host(struct ci_hdrc *ci)
2141 {
2142         /*
2143          * host doesn't care B_SESSION_VALID event
2144          * so clear and disbale BSV irq
2145          */
2146         if (ci->is_otg)
2147                 hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
2148
2149         ci->vbus_active = 0;
2150
2151         if (ci->platdata->pins_device && ci->platdata->pins_default)
2152                 pinctrl_select_state(ci->platdata->pctl,
2153                                      ci->platdata->pins_default);
2154 }
2155
2156 /**
2157  * ci_hdrc_gadget_init - initialize device related bits
2158  * @ci: the controller
2159  *
2160  * This function initializes the gadget, if the device is "device capable".
2161  */
2162 int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2163 {
2164         struct ci_role_driver *rdrv;
2165         int ret;
2166
2167         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2168                 return -ENXIO;
2169
2170         rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2171         if (!rdrv)
2172                 return -ENOMEM;
2173
2174         rdrv->start     = udc_id_switch_for_device;
2175         rdrv->stop      = udc_id_switch_for_host;
2176         rdrv->irq       = udc_irq;
2177         rdrv->name      = "gadget";
2178
2179         ret = udc_start(ci);
2180         if (!ret)
2181                 ci->roles[CI_ROLE_GADGET] = rdrv;
2182
2183         return ret;
2184 }