linux/drivers/usb/chipidea/udc.c
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   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 */
  31static const struct usb_endpoint_descriptor
  32ctrl_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
  41static const struct usb_endpoint_descriptor
  42ctrl_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 */
  58static inline int hw_ep_bit(int num, int dir)
  59{
  60        return num + ((dir == TX) ? 16 : 0);
  61}
  62
  63static inline int ep_to_bit(struct ci_hdrc *ci, int n)
  64{
  65        int fill = 16 - ci->hw_ep_max / 2;
  66
  67        if (n >= ci->hw_ep_max / 2)
  68                n += fill;
  69
  70        return n;
  71}
  72
  73/**
  74 * hw_device_state: enables/disables interrupts (execute without interruption)
  75 * @dma: 0 => disable, !0 => enable and set dma engine
  76 *
  77 * This function returns an error code
  78 */
  79static int hw_device_state(struct ci_hdrc *ci, u32 dma)
  80{
  81        if (dma) {
  82                hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
  83                /* interrupt, error, port change, reset, sleep/suspend */
  84                hw_write(ci, OP_USBINTR, ~0,
  85                             USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
  86        } else {
  87                hw_write(ci, OP_USBINTR, ~0, 0);
  88        }
  89        return 0;
  90}
  91
  92/**
  93 * hw_ep_flush: flush endpoint fifo (execute without interruption)
  94 * @num: endpoint number
  95 * @dir: endpoint direction
  96 *
  97 * This function returns an error code
  98 */
  99static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
 100{
 101        int n = hw_ep_bit(num, dir);
 102
 103        do {
 104                /* flush any pending transfer */
 105                hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
 106                while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
 107                        cpu_relax();
 108        } while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
 109
 110        return 0;
 111}
 112
 113/**
 114 * hw_ep_disable: disables endpoint (execute without interruption)
 115 * @num: endpoint number
 116 * @dir: endpoint direction
 117 *
 118 * This function returns an error code
 119 */
 120static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
 121{
 122        hw_write(ci, OP_ENDPTCTRL + num,
 123                 (dir == TX) ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 124        return 0;
 125}
 126
 127/**
 128 * hw_ep_enable: enables endpoint (execute without interruption)
 129 * @num:  endpoint number
 130 * @dir:  endpoint direction
 131 * @type: endpoint type
 132 *
 133 * This function returns an error code
 134 */
 135static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
 136{
 137        u32 mask, data;
 138
 139        if (dir == TX) {
 140                mask  = ENDPTCTRL_TXT;  /* type    */
 141                data  = type << __ffs(mask);
 142
 143                mask |= ENDPTCTRL_TXS;  /* unstall */
 144                mask |= ENDPTCTRL_TXR;  /* reset data toggle */
 145                data |= ENDPTCTRL_TXR;
 146                mask |= ENDPTCTRL_TXE;  /* enable  */
 147                data |= ENDPTCTRL_TXE;
 148        } else {
 149                mask  = ENDPTCTRL_RXT;  /* type    */
 150                data  = type << __ffs(mask);
 151
 152                mask |= ENDPTCTRL_RXS;  /* unstall */
 153                mask |= ENDPTCTRL_RXR;  /* reset data toggle */
 154                data |= ENDPTCTRL_RXR;
 155                mask |= ENDPTCTRL_RXE;  /* enable  */
 156                data |= ENDPTCTRL_RXE;
 157        }
 158        hw_write(ci, OP_ENDPTCTRL + num, mask, data);
 159        return 0;
 160}
 161
 162/**
 163 * hw_ep_get_halt: return endpoint halt status
 164 * @num: endpoint number
 165 * @dir: endpoint direction
 166 *
 167 * This function returns 1 if endpoint halted
 168 */
 169static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
 170{
 171        u32 mask = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 172
 173        return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
 174}
 175
 176/**
 177 * hw_ep_prime: primes endpoint (execute without interruption)
 178 * @num:     endpoint number
 179 * @dir:     endpoint direction
 180 * @is_ctrl: true if control endpoint
 181 *
 182 * This function returns an error code
 183 */
 184static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
 185{
 186        int n = hw_ep_bit(num, dir);
 187
 188        /* Synchronize before ep prime */
 189        wmb();
 190
 191        if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 192                return -EAGAIN;
 193
 194        hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
 195
 196        while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 197                cpu_relax();
 198        if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
 199                return -EAGAIN;
 200
 201        /* status shoult be tested according with manual but it doesn't work */
 202        return 0;
 203}
 204
 205/**
 206 * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
 207 *                 without interruption)
 208 * @num:   endpoint number
 209 * @dir:   endpoint direction
 210 * @value: true => stall, false => unstall
 211 *
 212 * This function returns an error code
 213 */
 214static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
 215{
 216        if (value != 0 && value != 1)
 217                return -EINVAL;
 218
 219        do {
 220                enum ci_hw_regs reg = OP_ENDPTCTRL + num;
 221                u32 mask_xs = (dir == TX) ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
 222                u32 mask_xr = (dir == TX) ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
 223
 224                /* data toggle - reserved for EP0 but it's in ESS */
 225                hw_write(ci, reg, mask_xs|mask_xr,
 226                          value ? mask_xs : mask_xr);
 227        } while (value != hw_ep_get_halt(ci, num, dir));
 228
 229        return 0;
 230}
 231
 232/**
 233 * hw_is_port_high_speed: test if port is high speed
 234 *
 235 * This function returns true if high speed port
 236 */
 237static int hw_port_is_high_speed(struct ci_hdrc *ci)
 238{
 239        return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
 240                hw_read(ci, OP_PORTSC, PORTSC_HSP);
 241}
 242
 243/**
 244 * hw_test_and_clear_complete: test & clear complete status (execute without
 245 *                             interruption)
 246 * @n: endpoint number
 247 *
 248 * This function returns complete status
 249 */
 250static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
 251{
 252        n = ep_to_bit(ci, n);
 253        return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
 254}
 255
 256/**
 257 * hw_test_and_clear_intr_active: test & clear active interrupts (execute
 258 *                                without interruption)
 259 *
 260 * This function returns active interrutps
 261 */
 262static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
 263{
 264        u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
 265
 266        hw_write(ci, OP_USBSTS, ~0, reg);
 267        return reg;
 268}
 269
 270/**
 271 * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
 272 *                                interruption)
 273 *
 274 * This function returns guard value
 275 */
 276static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
 277{
 278        return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
 279}
 280
 281/**
 282 * hw_test_and_set_setup_guard: test & set setup guard (execute without
 283 *                              interruption)
 284 *
 285 * This function returns guard value
 286 */
 287static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
 288{
 289        return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
 290}
 291
 292/**
 293 * hw_usb_set_address: configures USB address (execute without interruption)
 294 * @value: new USB address
 295 *
 296 * This function explicitly sets the address, without the "USBADRA" (advance)
 297 * feature, which is not supported by older versions of the controller.
 298 */
 299static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
 300{
 301        hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
 302                 value << __ffs(DEVICEADDR_USBADR));
 303}
 304
 305/**
 306 * hw_usb_reset: restart device after a bus reset (execute without
 307 *               interruption)
 308 *
 309 * This function returns an error code
 310 */
 311static int hw_usb_reset(struct ci_hdrc *ci)
 312{
 313        hw_usb_set_address(ci, 0);
 314
 315        /* ESS flushes only at end?!? */
 316        hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
 317
 318        /* clear setup token semaphores */
 319        hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
 320
 321        /* clear complete status */
 322        hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
 323
 324        /* wait until all bits cleared */
 325        while (hw_read(ci, OP_ENDPTPRIME, ~0))
 326                udelay(10);             /* not RTOS friendly */
 327
 328        /* reset all endpoints ? */
 329
 330        /* reset internal status and wait for further instructions
 331           no need to verify the port reset status (ESS does it) */
 332
 333        return 0;
 334}
 335
 336/******************************************************************************
 337 * UTIL block
 338 *****************************************************************************/
 339
 340static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
 341                          unsigned length)
 342{
 343        int i;
 344        u32 temp;
 345        struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
 346                                                  GFP_ATOMIC);
 347
 348        if (node == NULL)
 349                return -ENOMEM;
 350
 351        node->ptr = dma_pool_zalloc(hwep->td_pool, GFP_ATOMIC, &node->dma);
 352        if (node->ptr == NULL) {
 353                kfree(node);
 354                return -ENOMEM;
 355        }
 356
 357        node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
 358        node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
 359        node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
 360        if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
 361                u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 362
 363                if (hwreq->req.length == 0
 364                                || hwreq->req.length % hwep->ep.maxpacket)
 365                        mul++;
 366                node->ptr->token |= cpu_to_le32(mul << __ffs(TD_MULTO));
 367        }
 368
 369        temp = (u32) (hwreq->req.dma + hwreq->req.actual);
 370        if (length) {
 371                node->ptr->page[0] = cpu_to_le32(temp);
 372                for (i = 1; i < TD_PAGE_COUNT; i++) {
 373                        u32 page = temp + i * CI_HDRC_PAGE_SIZE;
 374                        page &= ~TD_RESERVED_MASK;
 375                        node->ptr->page[i] = cpu_to_le32(page);
 376                }
 377        }
 378
 379        hwreq->req.actual += length;
 380
 381        if (!list_empty(&hwreq->tds)) {
 382                /* get the last entry */
 383                lastnode = list_entry(hwreq->tds.prev,
 384                                struct td_node, td);
 385                lastnode->ptr->next = cpu_to_le32(node->dma);
 386        }
 387
 388        INIT_LIST_HEAD(&node->td);
 389        list_add_tail(&node->td, &hwreq->tds);
 390
 391        return 0;
 392}
 393
 394/**
 395 * _usb_addr: calculates endpoint address from direction & number
 396 * @ep:  endpoint
 397 */
 398static inline u8 _usb_addr(struct ci_hw_ep *ep)
 399{
 400        return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
 401}
 402
 403/**
 404 * _hardware_enqueue: configures a request at hardware level
 405 * @hwep:   endpoint
 406 * @hwreq:  request
 407 *
 408 * This function returns an error code
 409 */
 410static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 411{
 412        struct ci_hdrc *ci = hwep->ci;
 413        int ret = 0;
 414        unsigned rest = hwreq->req.length;
 415        int pages = TD_PAGE_COUNT;
 416        struct td_node *firstnode, *lastnode;
 417
 418        /* don't queue twice */
 419        if (hwreq->req.status == -EALREADY)
 420                return -EALREADY;
 421
 422        hwreq->req.status = -EALREADY;
 423
 424        ret = usb_gadget_map_request_by_dev(ci->dev->parent,
 425                                            &hwreq->req, hwep->dir);
 426        if (ret)
 427                return ret;
 428
 429        /*
 430         * The first buffer could be not page aligned.
 431         * In that case we have to span into one extra td.
 432         */
 433        if (hwreq->req.dma % PAGE_SIZE)
 434                pages--;
 435
 436        if (rest == 0) {
 437                ret = add_td_to_list(hwep, hwreq, 0);
 438                if (ret < 0)
 439                        goto done;
 440        }
 441
 442        while (rest > 0) {
 443                unsigned count = min(hwreq->req.length - hwreq->req.actual,
 444                                        (unsigned)(pages * CI_HDRC_PAGE_SIZE));
 445                ret = add_td_to_list(hwep, hwreq, count);
 446                if (ret < 0)
 447                        goto done;
 448
 449                rest -= count;
 450        }
 451
 452        if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
 453            && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
 454                ret = add_td_to_list(hwep, hwreq, 0);
 455                if (ret < 0)
 456                        goto done;
 457        }
 458
 459        firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 460
 461        lastnode = list_entry(hwreq->tds.prev,
 462                struct td_node, td);
 463
 464        lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
 465        if (!hwreq->req.no_interrupt)
 466                lastnode->ptr->token |= cpu_to_le32(TD_IOC);
 467        wmb();
 468
 469        hwreq->req.actual = 0;
 470        if (!list_empty(&hwep->qh.queue)) {
 471                struct ci_hw_req *hwreqprev;
 472                int n = hw_ep_bit(hwep->num, hwep->dir);
 473                int tmp_stat;
 474                struct td_node *prevlastnode;
 475                u32 next = firstnode->dma & TD_ADDR_MASK;
 476
 477                hwreqprev = list_entry(hwep->qh.queue.prev,
 478                                struct ci_hw_req, queue);
 479                prevlastnode = list_entry(hwreqprev->tds.prev,
 480                                struct td_node, td);
 481
 482                prevlastnode->ptr->next = cpu_to_le32(next);
 483                wmb();
 484                if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
 485                        goto done;
 486                do {
 487                        hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
 488                        tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
 489                } while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
 490                hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
 491                if (tmp_stat)
 492                        goto done;
 493        }
 494
 495        /*  QH configuration */
 496        hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
 497        hwep->qh.ptr->td.token &=
 498                cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
 499
 500        if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
 501                u32 mul = hwreq->req.length / hwep->ep.maxpacket;
 502
 503                if (hwreq->req.length == 0
 504                                || hwreq->req.length % hwep->ep.maxpacket)
 505                        mul++;
 506                hwep->qh.ptr->cap |= cpu_to_le32(mul << __ffs(QH_MULT));
 507        }
 508
 509        ret = hw_ep_prime(ci, hwep->num, hwep->dir,
 510                           hwep->type == USB_ENDPOINT_XFER_CONTROL);
 511done:
 512        return ret;
 513}
 514
 515/*
 516 * free_pending_td: remove a pending request for the endpoint
 517 * @hwep: endpoint
 518 */
 519static void free_pending_td(struct ci_hw_ep *hwep)
 520{
 521        struct td_node *pending = hwep->pending_td;
 522
 523        dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
 524        hwep->pending_td = NULL;
 525        kfree(pending);
 526}
 527
 528static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
 529                                           struct td_node *node)
 530{
 531        hwep->qh.ptr->td.next = cpu_to_le32(node->dma);
 532        hwep->qh.ptr->td.token &=
 533                cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
 534
 535        return hw_ep_prime(ci, hwep->num, hwep->dir,
 536                                hwep->type == USB_ENDPOINT_XFER_CONTROL);
 537}
 538
 539/**
 540 * _hardware_dequeue: handles a request at hardware level
 541 * @gadget: gadget
 542 * @hwep:   endpoint
 543 *
 544 * This function returns an error code
 545 */
 546static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 547{
 548        u32 tmptoken;
 549        struct td_node *node, *tmpnode;
 550        unsigned remaining_length;
 551        unsigned actual = hwreq->req.length;
 552        struct ci_hdrc *ci = hwep->ci;
 553
 554        if (hwreq->req.status != -EALREADY)
 555                return -EINVAL;
 556
 557        hwreq->req.status = 0;
 558
 559        list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 560                tmptoken = le32_to_cpu(node->ptr->token);
 561                if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
 562                        int n = hw_ep_bit(hwep->num, hwep->dir);
 563
 564                        if (ci->rev == CI_REVISION_24)
 565                                if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
 566                                        reprime_dtd(ci, hwep, node);
 567                        hwreq->req.status = -EALREADY;
 568                        return -EBUSY;
 569                }
 570
 571                remaining_length = (tmptoken & TD_TOTAL_BYTES);
 572                remaining_length >>= __ffs(TD_TOTAL_BYTES);
 573                actual -= remaining_length;
 574
 575                hwreq->req.status = tmptoken & TD_STATUS;
 576                if ((TD_STATUS_HALTED & hwreq->req.status)) {
 577                        hwreq->req.status = -EPIPE;
 578                        break;
 579                } else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
 580                        hwreq->req.status = -EPROTO;
 581                        break;
 582                } else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
 583                        hwreq->req.status = -EILSEQ;
 584                        break;
 585                }
 586
 587                if (remaining_length) {
 588                        if (hwep->dir == TX) {
 589                                hwreq->req.status = -EPROTO;
 590                                break;
 591                        }
 592                }
 593                /*
 594                 * As the hardware could still address the freed td
 595                 * which will run the udc unusable, the cleanup of the
 596                 * td has to be delayed by one.
 597                 */
 598                if (hwep->pending_td)
 599                        free_pending_td(hwep);
 600
 601                hwep->pending_td = node;
 602                list_del_init(&node->td);
 603        }
 604
 605        usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
 606                                        &hwreq->req, hwep->dir);
 607
 608        hwreq->req.actual += actual;
 609
 610        if (hwreq->req.status)
 611                return hwreq->req.status;
 612
 613        return hwreq->req.actual;
 614}
 615
 616/**
 617 * _ep_nuke: dequeues all endpoint requests
 618 * @hwep: endpoint
 619 *
 620 * This function returns an error code
 621 * Caller must hold lock
 622 */
 623static int _ep_nuke(struct ci_hw_ep *hwep)
 624__releases(hwep->lock)
 625__acquires(hwep->lock)
 626{
 627        struct td_node *node, *tmpnode;
 628        if (hwep == NULL)
 629                return -EINVAL;
 630
 631        hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
 632
 633        while (!list_empty(&hwep->qh.queue)) {
 634
 635                /* pop oldest request */
 636                struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
 637                                                     struct ci_hw_req, queue);
 638
 639                list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
 640                        dma_pool_free(hwep->td_pool, node->ptr, node->dma);
 641                        list_del_init(&node->td);
 642                        node->ptr = NULL;
 643                        kfree(node);
 644                }
 645
 646                list_del_init(&hwreq->queue);
 647                hwreq->req.status = -ESHUTDOWN;
 648
 649                if (hwreq->req.complete != NULL) {
 650                        spin_unlock(hwep->lock);
 651                        usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
 652                        spin_lock(hwep->lock);
 653                }
 654        }
 655
 656        if (hwep->pending_td)
 657                free_pending_td(hwep);
 658
 659        return 0;
 660}
 661
 662static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
 663{
 664        struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
 665        int direction, retval = 0;
 666        unsigned long flags;
 667
 668        if (ep == NULL || hwep->ep.desc == NULL)
 669                return -EINVAL;
 670
 671        if (usb_endpoint_xfer_isoc(hwep->ep.desc))
 672                return -EOPNOTSUPP;
 673
 674        spin_lock_irqsave(hwep->lock, flags);
 675
 676        if (value && hwep->dir == TX && check_transfer &&
 677                !list_empty(&hwep->qh.queue) &&
 678                        !usb_endpoint_xfer_control(hwep->ep.desc)) {
 679                spin_unlock_irqrestore(hwep->lock, flags);
 680                return -EAGAIN;
 681        }
 682
 683        direction = hwep->dir;
 684        do {
 685                retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
 686
 687                if (!value)
 688                        hwep->wedge = 0;
 689
 690                if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
 691                        hwep->dir = (hwep->dir == TX) ? RX : TX;
 692
 693        } while (hwep->dir != direction);
 694
 695        spin_unlock_irqrestore(hwep->lock, flags);
 696        return retval;
 697}
 698
 699
 700/**
 701 * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
 702 * @gadget: gadget
 703 *
 704 * This function returns an error code
 705 */
 706static int _gadget_stop_activity(struct usb_gadget *gadget)
 707{
 708        struct usb_ep *ep;
 709        struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
 710        unsigned long flags;
 711
 712        spin_lock_irqsave(&ci->lock, flags);
 713        ci->gadget.speed = USB_SPEED_UNKNOWN;
 714        ci->remote_wakeup = 0;
 715        ci->suspended = 0;
 716        spin_unlock_irqrestore(&ci->lock, flags);
 717
 718        /* flush all endpoints */
 719        gadget_for_each_ep(ep, gadget) {
 720                usb_ep_fifo_flush(ep);
 721        }
 722        usb_ep_fifo_flush(&ci->ep0out->ep);
 723        usb_ep_fifo_flush(&ci->ep0in->ep);
 724
 725        /* make sure to disable all endpoints */
 726        gadget_for_each_ep(ep, gadget) {
 727                usb_ep_disable(ep);
 728        }
 729
 730        if (ci->status != NULL) {
 731                usb_ep_free_request(&ci->ep0in->ep, ci->status);
 732                ci->status = NULL;
 733        }
 734
 735        return 0;
 736}
 737
 738/******************************************************************************
 739 * ISR block
 740 *****************************************************************************/
 741/**
 742 * isr_reset_handler: USB reset interrupt handler
 743 * @ci: UDC device
 744 *
 745 * This function resets USB engine after a bus reset occurred
 746 */
 747static void isr_reset_handler(struct ci_hdrc *ci)
 748__releases(ci->lock)
 749__acquires(ci->lock)
 750{
 751        int retval;
 752
 753        spin_unlock(&ci->lock);
 754        if (ci->gadget.speed != USB_SPEED_UNKNOWN)
 755                usb_gadget_udc_reset(&ci->gadget, ci->driver);
 756
 757        retval = _gadget_stop_activity(&ci->gadget);
 758        if (retval)
 759                goto done;
 760
 761        retval = hw_usb_reset(ci);
 762        if (retval)
 763                goto done;
 764
 765        ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
 766        if (ci->status == NULL)
 767                retval = -ENOMEM;
 768
 769done:
 770        spin_lock(&ci->lock);
 771
 772        if (retval)
 773                dev_err(ci->dev, "error: %i\n", retval);
 774}
 775
 776/**
 777 * isr_get_status_complete: get_status request complete function
 778 * @ep:  endpoint
 779 * @req: request handled
 780 *
 781 * Caller must release lock
 782 */
 783static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 784{
 785        if (ep == NULL || req == NULL)
 786                return;
 787
 788        kfree(req->buf);
 789        usb_ep_free_request(ep, req);
 790}
 791
 792/**
 793 * _ep_queue: queues (submits) an I/O request to an endpoint
 794 * @ep:        endpoint
 795 * @req:       request
 796 * @gfp_flags: GFP flags (not used)
 797 *
 798 * Caller must hold lock
 799 * This function returns an error code
 800 */
 801static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 802                    gfp_t __maybe_unused gfp_flags)
 803{
 804        struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
 805        struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
 806        struct ci_hdrc *ci = hwep->ci;
 807        int retval = 0;
 808
 809        if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
 810                return -EINVAL;
 811
 812        if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
 813                if (req->length)
 814                        hwep = (ci->ep0_dir == RX) ?
 815                               ci->ep0out : ci->ep0in;
 816                if (!list_empty(&hwep->qh.queue)) {
 817                        _ep_nuke(hwep);
 818                        dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
 819                                 _usb_addr(hwep));
 820                }
 821        }
 822
 823        if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
 824            hwreq->req.length > hwep->ep.mult * hwep->ep.maxpacket) {
 825                dev_err(hwep->ci->dev, "request length too big for isochronous\n");
 826                return -EMSGSIZE;
 827        }
 828
 829        /* first nuke then test link, e.g. previous status has not sent */
 830        if (!list_empty(&hwreq->queue)) {
 831                dev_err(hwep->ci->dev, "request already in queue\n");
 832                return -EBUSY;
 833        }
 834
 835        /* push request */
 836        hwreq->req.status = -EINPROGRESS;
 837        hwreq->req.actual = 0;
 838
 839        retval = _hardware_enqueue(hwep, hwreq);
 840
 841        if (retval == -EALREADY)
 842                retval = 0;
 843        if (!retval)
 844                list_add_tail(&hwreq->queue, &hwep->qh.queue);
 845
 846        return retval;
 847}
 848
 849/**
 850 * isr_get_status_response: get_status request response
 851 * @ci: ci struct
 852 * @setup: setup request packet
 853 *
 854 * This function returns an error code
 855 */
 856static int isr_get_status_response(struct ci_hdrc *ci,
 857                                   struct usb_ctrlrequest *setup)
 858__releases(hwep->lock)
 859__acquires(hwep->lock)
 860{
 861        struct ci_hw_ep *hwep = ci->ep0in;
 862        struct usb_request *req = NULL;
 863        gfp_t gfp_flags = GFP_ATOMIC;
 864        int dir, num, retval;
 865
 866        if (hwep == NULL || setup == NULL)
 867                return -EINVAL;
 868
 869        spin_unlock(hwep->lock);
 870        req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
 871        spin_lock(hwep->lock);
 872        if (req == NULL)
 873                return -ENOMEM;
 874
 875        req->complete = isr_get_status_complete;
 876        req->length   = 2;
 877        req->buf      = kzalloc(req->length, gfp_flags);
 878        if (req->buf == NULL) {
 879                retval = -ENOMEM;
 880                goto err_free_req;
 881        }
 882
 883        if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
 884                *(u16 *)req->buf = (ci->remote_wakeup << 1) |
 885                        ci->gadget.is_selfpowered;
 886        } else if ((setup->bRequestType & USB_RECIP_MASK) \
 887                   == USB_RECIP_ENDPOINT) {
 888                dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
 889                        TX : RX;
 890                num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 891                *(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
 892        }
 893        /* else do nothing; reserved for future use */
 894
 895        retval = _ep_queue(&hwep->ep, req, gfp_flags);
 896        if (retval)
 897                goto err_free_buf;
 898
 899        return 0;
 900
 901 err_free_buf:
 902        kfree(req->buf);
 903 err_free_req:
 904        spin_unlock(hwep->lock);
 905        usb_ep_free_request(&hwep->ep, req);
 906        spin_lock(hwep->lock);
 907        return retval;
 908}
 909
 910/**
 911 * isr_setup_status_complete: setup_status request complete function
 912 * @ep:  endpoint
 913 * @req: request handled
 914 *
 915 * Caller must release lock. Put the port in test mode if test mode
 916 * feature is selected.
 917 */
 918static void
 919isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
 920{
 921        struct ci_hdrc *ci = req->context;
 922        unsigned long flags;
 923
 924        if (ci->setaddr) {
 925                hw_usb_set_address(ci, ci->address);
 926                ci->setaddr = false;
 927                if (ci->address)
 928                        usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
 929        }
 930
 931        spin_lock_irqsave(&ci->lock, flags);
 932        if (ci->test_mode)
 933                hw_port_test_set(ci, ci->test_mode);
 934        spin_unlock_irqrestore(&ci->lock, flags);
 935}
 936
 937/**
 938 * isr_setup_status_phase: queues the status phase of a setup transation
 939 * @ci: ci struct
 940 *
 941 * This function returns an error code
 942 */
 943static int isr_setup_status_phase(struct ci_hdrc *ci)
 944{
 945        struct ci_hw_ep *hwep;
 946
 947        /*
 948         * Unexpected USB controller behavior, caused by bad signal integrity
 949         * or ground reference problems, can lead to isr_setup_status_phase
 950         * being called with ci->status equal to NULL.
 951         * If this situation occurs, you should review your USB hardware design.
 952         */
 953        if (WARN_ON_ONCE(!ci->status))
 954                return -EPIPE;
 955
 956        hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
 957        ci->status->context = ci;
 958        ci->status->complete = isr_setup_status_complete;
 959
 960        return _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
 961}
 962
 963/**
 964 * isr_tr_complete_low: transaction complete low level handler
 965 * @hwep: endpoint
 966 *
 967 * This function returns an error code
 968 * Caller must hold lock
 969 */
 970static int isr_tr_complete_low(struct ci_hw_ep *hwep)
 971__releases(hwep->lock)
 972__acquires(hwep->lock)
 973{
 974        struct ci_hw_req *hwreq, *hwreqtemp;
 975        struct ci_hw_ep *hweptemp = hwep;
 976        int retval = 0;
 977
 978        list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
 979                        queue) {
 980                retval = _hardware_dequeue(hwep, hwreq);
 981                if (retval < 0)
 982                        break;
 983                list_del_init(&hwreq->queue);
 984                if (hwreq->req.complete != NULL) {
 985                        spin_unlock(hwep->lock);
 986                        if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
 987                                        hwreq->req.length)
 988                                hweptemp = hwep->ci->ep0in;
 989                        usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
 990                        spin_lock(hwep->lock);
 991                }
 992        }
 993
 994        if (retval == -EBUSY)
 995                retval = 0;
 996
 997        return retval;
 998}
 999
1000static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
1001{
1002        dev_warn(&ci->gadget.dev,
1003                "connect the device to an alternate port if you want HNP\n");
1004        return isr_setup_status_phase(ci);
1005}
1006
1007/**
1008 * isr_setup_packet_handler: setup packet handler
1009 * @ci: UDC descriptor
1010 *
1011 * This function handles setup packet 
1012 */
1013static void isr_setup_packet_handler(struct ci_hdrc *ci)
1014__releases(ci->lock)
1015__acquires(ci->lock)
1016{
1017        struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
1018        struct usb_ctrlrequest req;
1019        int type, num, dir, err = -EINVAL;
1020        u8 tmode = 0;
1021
1022        /*
1023         * Flush data and handshake transactions of previous
1024         * setup packet.
1025         */
1026        _ep_nuke(ci->ep0out);
1027        _ep_nuke(ci->ep0in);
1028
1029        /* read_setup_packet */
1030        do {
1031                hw_test_and_set_setup_guard(ci);
1032                memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
1033        } while (!hw_test_and_clear_setup_guard(ci));
1034
1035        type = req.bRequestType;
1036
1037        ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
1038
1039        switch (req.bRequest) {
1040        case USB_REQ_CLEAR_FEATURE:
1041                if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1042                                le16_to_cpu(req.wValue) ==
1043                                USB_ENDPOINT_HALT) {
1044                        if (req.wLength != 0)
1045                                break;
1046                        num  = le16_to_cpu(req.wIndex);
1047                        dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1048                        num &= USB_ENDPOINT_NUMBER_MASK;
1049                        if (dir == TX)
1050                                num += ci->hw_ep_max / 2;
1051                        if (!ci->ci_hw_ep[num].wedge) {
1052                                spin_unlock(&ci->lock);
1053                                err = usb_ep_clear_halt(
1054                                        &ci->ci_hw_ep[num].ep);
1055                                spin_lock(&ci->lock);
1056                                if (err)
1057                                        break;
1058                        }
1059                        err = isr_setup_status_phase(ci);
1060                } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
1061                                le16_to_cpu(req.wValue) ==
1062                                USB_DEVICE_REMOTE_WAKEUP) {
1063                        if (req.wLength != 0)
1064                                break;
1065                        ci->remote_wakeup = 0;
1066                        err = isr_setup_status_phase(ci);
1067                } else {
1068                        goto delegate;
1069                }
1070                break;
1071        case USB_REQ_GET_STATUS:
1072                if ((type != (USB_DIR_IN|USB_RECIP_DEVICE) ||
1073                        le16_to_cpu(req.wIndex) == OTG_STS_SELECTOR) &&
1074                    type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
1075                    type != (USB_DIR_IN|USB_RECIP_INTERFACE))
1076                        goto delegate;
1077                if (le16_to_cpu(req.wLength) != 2 ||
1078                    le16_to_cpu(req.wValue)  != 0)
1079                        break;
1080                err = isr_get_status_response(ci, &req);
1081                break;
1082        case USB_REQ_SET_ADDRESS:
1083                if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
1084                        goto delegate;
1085                if (le16_to_cpu(req.wLength) != 0 ||
1086                    le16_to_cpu(req.wIndex)  != 0)
1087                        break;
1088                ci->address = (u8)le16_to_cpu(req.wValue);
1089                ci->setaddr = true;
1090                err = isr_setup_status_phase(ci);
1091                break;
1092        case USB_REQ_SET_FEATURE:
1093                if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
1094                                le16_to_cpu(req.wValue) ==
1095                                USB_ENDPOINT_HALT) {
1096                        if (req.wLength != 0)
1097                                break;
1098                        num  = le16_to_cpu(req.wIndex);
1099                        dir = (num & USB_ENDPOINT_DIR_MASK) ? TX : RX;
1100                        num &= USB_ENDPOINT_NUMBER_MASK;
1101                        if (dir == TX)
1102                                num += ci->hw_ep_max / 2;
1103
1104                        spin_unlock(&ci->lock);
1105                        err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
1106                        spin_lock(&ci->lock);
1107                        if (!err)
1108                                isr_setup_status_phase(ci);
1109                } else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
1110                        if (req.wLength != 0)
1111                                break;
1112                        switch (le16_to_cpu(req.wValue)) {
1113                        case USB_DEVICE_REMOTE_WAKEUP:
1114                                ci->remote_wakeup = 1;
1115                                err = isr_setup_status_phase(ci);
1116                                break;
1117                        case USB_DEVICE_TEST_MODE:
1118                                tmode = le16_to_cpu(req.wIndex) >> 8;
1119                                switch (tmode) {
1120                                case TEST_J:
1121                                case TEST_K:
1122                                case TEST_SE0_NAK:
1123                                case TEST_PACKET:
1124                                case TEST_FORCE_EN:
1125                                        ci->test_mode = tmode;
1126                                        err = isr_setup_status_phase(
1127                                                        ci);
1128                                        break;
1129                                default:
1130                                        break;
1131                                }
1132                                break;
1133                        case USB_DEVICE_B_HNP_ENABLE:
1134                                if (ci_otg_is_fsm_mode(ci)) {
1135                                        ci->gadget.b_hnp_enable = 1;
1136                                        err = isr_setup_status_phase(
1137                                                        ci);
1138                                }
1139                                break;
1140                        case USB_DEVICE_A_ALT_HNP_SUPPORT:
1141                                if (ci_otg_is_fsm_mode(ci))
1142                                        err = otg_a_alt_hnp_support(ci);
1143                                break;
1144                        case USB_DEVICE_A_HNP_SUPPORT:
1145                                if (ci_otg_is_fsm_mode(ci)) {
1146                                        ci->gadget.a_hnp_support = 1;
1147                                        err = isr_setup_status_phase(
1148                                                        ci);
1149                                }
1150                                break;
1151                        default:
1152                                goto delegate;
1153                        }
1154                } else {
1155                        goto delegate;
1156                }
1157                break;
1158        default:
1159delegate:
1160                if (req.wLength == 0)   /* no data phase */
1161                        ci->ep0_dir = TX;
1162
1163                spin_unlock(&ci->lock);
1164                err = ci->driver->setup(&ci->gadget, &req);
1165                spin_lock(&ci->lock);
1166                break;
1167        }
1168
1169        if (err < 0) {
1170                spin_unlock(&ci->lock);
1171                if (_ep_set_halt(&hwep->ep, 1, false))
1172                        dev_err(ci->dev, "error: _ep_set_halt\n");
1173                spin_lock(&ci->lock);
1174        }
1175}
1176
1177/**
1178 * isr_tr_complete_handler: transaction complete interrupt handler
1179 * @ci: UDC descriptor
1180 *
1181 * This function handles traffic events
1182 */
1183static void isr_tr_complete_handler(struct ci_hdrc *ci)
1184__releases(ci->lock)
1185__acquires(ci->lock)
1186{
1187        unsigned i;
1188        int err;
1189
1190        for (i = 0; i < ci->hw_ep_max; i++) {
1191                struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
1192
1193                if (hwep->ep.desc == NULL)
1194                        continue;   /* not configured */
1195
1196                if (hw_test_and_clear_complete(ci, i)) {
1197                        err = isr_tr_complete_low(hwep);
1198                        if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1199                                if (err > 0)   /* needs status phase */
1200                                        err = isr_setup_status_phase(ci);
1201                                if (err < 0) {
1202                                        spin_unlock(&ci->lock);
1203                                        if (_ep_set_halt(&hwep->ep, 1, false))
1204                                                dev_err(ci->dev,
1205                                                "error: _ep_set_halt\n");
1206                                        spin_lock(&ci->lock);
1207                                }
1208                        }
1209                }
1210
1211                /* Only handle setup packet below */
1212                if (i == 0 &&
1213                        hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
1214                        isr_setup_packet_handler(ci);
1215        }
1216}
1217
1218/******************************************************************************
1219 * ENDPT block
1220 *****************************************************************************/
1221/**
1222 * ep_enable: configure endpoint, making it usable
1223 *
1224 * Check usb_ep_enable() at "usb_gadget.h" for details
1225 */
1226static int ep_enable(struct usb_ep *ep,
1227                     const struct usb_endpoint_descriptor *desc)
1228{
1229        struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1230        int retval = 0;
1231        unsigned long flags;
1232        u32 cap = 0;
1233
1234        if (ep == NULL || desc == NULL)
1235                return -EINVAL;
1236
1237        spin_lock_irqsave(hwep->lock, flags);
1238
1239        /* only internal SW should enable ctrl endpts */
1240
1241        if (!list_empty(&hwep->qh.queue)) {
1242                dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
1243                spin_unlock_irqrestore(hwep->lock, flags);
1244                return -EBUSY;
1245        }
1246
1247        hwep->ep.desc = desc;
1248
1249        hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
1250        hwep->num  = usb_endpoint_num(desc);
1251        hwep->type = usb_endpoint_type(desc);
1252
1253        hwep->ep.maxpacket = usb_endpoint_maxp(desc);
1254        hwep->ep.mult = usb_endpoint_maxp_mult(desc);
1255
1256        if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1257                cap |= QH_IOS;
1258
1259        cap |= QH_ZLT;
1260        cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
1261        /*
1262         * For ISO-TX, we set mult at QH as the largest value, and use
1263         * MultO at TD as real mult value.
1264         */
1265        if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
1266                cap |= 3 << __ffs(QH_MULT);
1267
1268        hwep->qh.ptr->cap = cpu_to_le32(cap);
1269
1270        hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
1271
1272        if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
1273                dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
1274                retval = -EINVAL;
1275        }
1276
1277        /*
1278         * Enable endpoints in the HW other than ep0 as ep0
1279         * is always enabled
1280         */
1281        if (hwep->num)
1282                retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
1283                                       hwep->type);
1284
1285        spin_unlock_irqrestore(hwep->lock, flags);
1286        return retval;
1287}
1288
1289/**
1290 * ep_disable: endpoint is no longer usable
1291 *
1292 * Check usb_ep_disable() at "usb_gadget.h" for details
1293 */
1294static int ep_disable(struct usb_ep *ep)
1295{
1296        struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1297        int direction, retval = 0;
1298        unsigned long flags;
1299
1300        if (ep == NULL)
1301                return -EINVAL;
1302        else if (hwep->ep.desc == NULL)
1303                return -EBUSY;
1304
1305        spin_lock_irqsave(hwep->lock, flags);
1306
1307        /* only internal SW should disable ctrl endpts */
1308
1309        direction = hwep->dir;
1310        do {
1311                retval |= _ep_nuke(hwep);
1312                retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
1313
1314                if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
1315                        hwep->dir = (hwep->dir == TX) ? RX : TX;
1316
1317        } while (hwep->dir != direction);
1318
1319        hwep->ep.desc = NULL;
1320
1321        spin_unlock_irqrestore(hwep->lock, flags);
1322        return retval;
1323}
1324
1325/**
1326 * ep_alloc_request: allocate a request object to use with this endpoint
1327 *
1328 * Check usb_ep_alloc_request() at "usb_gadget.h" for details
1329 */
1330static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1331{
1332        struct ci_hw_req *hwreq = NULL;
1333
1334        if (ep == NULL)
1335                return NULL;
1336
1337        hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
1338        if (hwreq != NULL) {
1339                INIT_LIST_HEAD(&hwreq->queue);
1340                INIT_LIST_HEAD(&hwreq->tds);
1341        }
1342
1343        return (hwreq == NULL) ? NULL : &hwreq->req;
1344}
1345
1346/**
1347 * ep_free_request: frees a request object
1348 *
1349 * Check usb_ep_free_request() at "usb_gadget.h" for details
1350 */
1351static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
1352{
1353        struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1354        struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1355        struct td_node *node, *tmpnode;
1356        unsigned long flags;
1357
1358        if (ep == NULL || req == NULL) {
1359                return;
1360        } else if (!list_empty(&hwreq->queue)) {
1361                dev_err(hwep->ci->dev, "freeing queued request\n");
1362                return;
1363        }
1364
1365        spin_lock_irqsave(hwep->lock, flags);
1366
1367        list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1368                dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1369                list_del_init(&node->td);
1370                node->ptr = NULL;
1371                kfree(node);
1372        }
1373
1374        kfree(hwreq);
1375
1376        spin_unlock_irqrestore(hwep->lock, flags);
1377}
1378
1379/**
1380 * ep_queue: queues (submits) an I/O request to an endpoint
1381 *
1382 * Check usb_ep_queue()* at usb_gadget.h" for details
1383 */
1384static int ep_queue(struct usb_ep *ep, struct usb_request *req,
1385                    gfp_t __maybe_unused gfp_flags)
1386{
1387        struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1388        int retval = 0;
1389        unsigned long flags;
1390
1391        if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
1392                return -EINVAL;
1393
1394        spin_lock_irqsave(hwep->lock, flags);
1395        retval = _ep_queue(ep, req, gfp_flags);
1396        spin_unlock_irqrestore(hwep->lock, flags);
1397        return retval;
1398}
1399
1400/**
1401 * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
1402 *
1403 * Check usb_ep_dequeue() at "usb_gadget.h" for details
1404 */
1405static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
1406{
1407        struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
1408        struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
1409        unsigned long flags;
1410        struct td_node *node, *tmpnode;
1411
1412        if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
1413                hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
1414                list_empty(&hwep->qh.queue))
1415                return -EINVAL;
1416
1417        spin_lock_irqsave(hwep->lock, flags);
1418
1419        hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1420
1421        list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
1422                dma_pool_free(hwep->td_pool, node->ptr, node->dma);
1423                list_del(&node->td);
1424                kfree(node);
1425        }
1426
1427        /* pop request */
1428        list_del_init(&hwreq->queue);
1429
1430        usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
1431
1432        req->status = -ECONNRESET;
1433
1434        if (hwreq->req.complete != NULL) {
1435                spin_unlock(hwep->lock);
1436                usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
1437                spin_lock(hwep->lock);
1438        }
1439
1440        spin_unlock_irqrestore(hwep->lock, flags);
1441        return 0;
1442}
1443
1444/**
1445 * ep_set_halt: sets the endpoint halt feature
1446 *
1447 * Check usb_ep_set_halt() at "usb_gadget.h" for details
1448 */
1449static int ep_set_halt(struct usb_ep *ep, int value)
1450{
1451        return _ep_set_halt(ep, value, true);
1452}
1453
1454/**
1455 * ep_set_wedge: sets the halt feature and ignores clear requests
1456 *
1457 * Check usb_ep_set_wedge() at "usb_gadget.h" for details
1458 */
1459static int ep_set_wedge(struct usb_ep *ep)
1460{
1461        struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1462        unsigned long flags;
1463
1464        if (ep == NULL || hwep->ep.desc == NULL)
1465                return -EINVAL;
1466
1467        spin_lock_irqsave(hwep->lock, flags);
1468        hwep->wedge = 1;
1469        spin_unlock_irqrestore(hwep->lock, flags);
1470
1471        return usb_ep_set_halt(ep);
1472}
1473
1474/**
1475 * ep_fifo_flush: flushes contents of a fifo
1476 *
1477 * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
1478 */
1479static void ep_fifo_flush(struct usb_ep *ep)
1480{
1481        struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
1482        unsigned long flags;
1483
1484        if (ep == NULL) {
1485                dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
1486                return;
1487        }
1488
1489        spin_lock_irqsave(hwep->lock, flags);
1490
1491        hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
1492
1493        spin_unlock_irqrestore(hwep->lock, flags);
1494}
1495
1496/**
1497 * Endpoint-specific part of the API to the USB controller hardware
1498 * Check "usb_gadget.h" for details
1499 */
1500static const struct usb_ep_ops usb_ep_ops = {
1501        .enable        = ep_enable,
1502        .disable       = ep_disable,
1503        .alloc_request = ep_alloc_request,
1504        .free_request  = ep_free_request,
1505        .queue         = ep_queue,
1506        .dequeue       = ep_dequeue,
1507        .set_halt      = ep_set_halt,
1508        .set_wedge     = ep_set_wedge,
1509        .fifo_flush    = ep_fifo_flush,
1510};
1511
1512/******************************************************************************
1513 * GADGET block
1514 *****************************************************************************/
1515static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
1516{
1517        struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1518        unsigned long flags;
1519        int gadget_ready = 0;
1520
1521        spin_lock_irqsave(&ci->lock, flags);
1522        ci->vbus_active = is_active;
1523        if (ci->driver)
1524                gadget_ready = 1;
1525        spin_unlock_irqrestore(&ci->lock, flags);
1526
1527        if (ci->usb_phy)
1528                usb_phy_set_charger_state(ci->usb_phy, is_active ?
1529                        USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
1530
1531        if (gadget_ready) {
1532                if (is_active) {
1533                        pm_runtime_get_sync(&_gadget->dev);
1534                        hw_device_reset(ci);
1535                        hw_device_state(ci, ci->ep0out->qh.dma);
1536                        usb_gadget_set_state(_gadget, USB_STATE_POWERED);
1537                        usb_udc_vbus_handler(_gadget, true);
1538                } else {
1539                        usb_udc_vbus_handler(_gadget, false);
1540                        if (ci->driver)
1541                                ci->driver->disconnect(&ci->gadget);
1542                        hw_device_state(ci, 0);
1543                        if (ci->platdata->notify_event)
1544                                ci->platdata->notify_event(ci,
1545                                CI_HDRC_CONTROLLER_STOPPED_EVENT);
1546                        _gadget_stop_activity(&ci->gadget);
1547                        pm_runtime_put_sync(&_gadget->dev);
1548                        usb_gadget_set_state(_gadget, USB_STATE_NOTATTACHED);
1549                }
1550        }
1551
1552        return 0;
1553}
1554
1555static int ci_udc_wakeup(struct usb_gadget *_gadget)
1556{
1557        struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1558        unsigned long flags;
1559        int ret = 0;
1560
1561        spin_lock_irqsave(&ci->lock, flags);
1562        if (!ci->remote_wakeup) {
1563                ret = -EOPNOTSUPP;
1564                goto out;
1565        }
1566        if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
1567                ret = -EINVAL;
1568                goto out;
1569        }
1570        hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
1571out:
1572        spin_unlock_irqrestore(&ci->lock, flags);
1573        return ret;
1574}
1575
1576static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
1577{
1578        struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1579
1580        if (ci->usb_phy)
1581                return usb_phy_set_power(ci->usb_phy, ma);
1582        return -ENOTSUPP;
1583}
1584
1585static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
1586{
1587        struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1588        struct ci_hw_ep *hwep = ci->ep0in;
1589        unsigned long flags;
1590
1591        spin_lock_irqsave(hwep->lock, flags);
1592        _gadget->is_selfpowered = (is_on != 0);
1593        spin_unlock_irqrestore(hwep->lock, flags);
1594
1595        return 0;
1596}
1597
1598/* Change Data+ pullup status
1599 * this func is used by usb_gadget_connect/disconnet
1600 */
1601static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
1602{
1603        struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
1604
1605        /*
1606         * Data+ pullup controlled by OTG state machine in OTG fsm mode;
1607         * and don't touch Data+ in host mode for dual role config.
1608         */
1609        if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
1610                return 0;
1611
1612        pm_runtime_get_sync(&ci->gadget.dev);
1613        if (is_on)
1614                hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
1615        else
1616                hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1617        pm_runtime_put_sync(&ci->gadget.dev);
1618
1619        return 0;
1620}
1621
1622static int ci_udc_start(struct usb_gadget *gadget,
1623                         struct usb_gadget_driver *driver);
1624static int ci_udc_stop(struct usb_gadget *gadget);
1625/**
1626 * Device operations part of the API to the USB controller hardware,
1627 * which don't involve endpoints (or i/o)
1628 * Check  "usb_gadget.h" for details
1629 */
1630static const struct usb_gadget_ops usb_gadget_ops = {
1631        .vbus_session   = ci_udc_vbus_session,
1632        .wakeup         = ci_udc_wakeup,
1633        .set_selfpowered        = ci_udc_selfpowered,
1634        .pullup         = ci_udc_pullup,
1635        .vbus_draw      = ci_udc_vbus_draw,
1636        .udc_start      = ci_udc_start,
1637        .udc_stop       = ci_udc_stop,
1638};
1639
1640static int init_eps(struct ci_hdrc *ci)
1641{
1642        int retval = 0, i, j;
1643
1644        for (i = 0; i < ci->hw_ep_max/2; i++)
1645                for (j = RX; j <= TX; j++) {
1646                        int k = i + j * ci->hw_ep_max/2;
1647                        struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
1648
1649                        scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
1650                                        (j == TX)  ? "in" : "out");
1651
1652                        hwep->ci          = ci;
1653                        hwep->lock         = &ci->lock;
1654                        hwep->td_pool      = ci->td_pool;
1655
1656                        hwep->ep.name      = hwep->name;
1657                        hwep->ep.ops       = &usb_ep_ops;
1658
1659                        if (i == 0) {
1660                                hwep->ep.caps.type_control = true;
1661                        } else {
1662                                hwep->ep.caps.type_iso = true;
1663                                hwep->ep.caps.type_bulk = true;
1664                                hwep->ep.caps.type_int = true;
1665                        }
1666
1667                        if (j == TX)
1668                                hwep->ep.caps.dir_in = true;
1669                        else
1670                                hwep->ep.caps.dir_out = true;
1671
1672                        /*
1673                         * for ep0: maxP defined in desc, for other
1674                         * eps, maxP is set by epautoconfig() called
1675                         * by gadget layer
1676                         */
1677                        usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
1678
1679                        INIT_LIST_HEAD(&hwep->qh.queue);
1680                        hwep->qh.ptr = dma_pool_zalloc(ci->qh_pool, GFP_KERNEL,
1681                                                       &hwep->qh.dma);
1682                        if (hwep->qh.ptr == NULL)
1683                                retval = -ENOMEM;
1684
1685                        /*
1686                         * set up shorthands for ep0 out and in endpoints,
1687                         * don't add to gadget's ep_list
1688                         */
1689                        if (i == 0) {
1690                                if (j == RX)
1691                                        ci->ep0out = hwep;
1692                                else
1693                                        ci->ep0in = hwep;
1694
1695                                usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
1696                                continue;
1697                        }
1698
1699                        list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
1700                }
1701
1702        return retval;
1703}
1704
1705static void destroy_eps(struct ci_hdrc *ci)
1706{
1707        int i;
1708
1709        for (i = 0; i < ci->hw_ep_max; i++) {
1710                struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
1711
1712                if (hwep->pending_td)
1713                        free_pending_td(hwep);
1714                dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
1715        }
1716}
1717
1718/**
1719 * ci_udc_start: register a gadget driver
1720 * @gadget: our gadget
1721 * @driver: the driver being registered
1722 *
1723 * Interrupts are enabled here.
1724 */
1725static int ci_udc_start(struct usb_gadget *gadget,
1726                         struct usb_gadget_driver *driver)
1727{
1728        struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1729        int retval = -ENOMEM;
1730
1731        if (driver->disconnect == NULL)
1732                return -EINVAL;
1733
1734
1735        ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
1736        retval = usb_ep_enable(&ci->ep0out->ep);
1737        if (retval)
1738                return retval;
1739
1740        ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
1741        retval = usb_ep_enable(&ci->ep0in->ep);
1742        if (retval)
1743                return retval;
1744
1745        ci->driver = driver;
1746
1747        /* Start otg fsm for B-device */
1748        if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
1749                ci_hdrc_otg_fsm_start(ci);
1750                return retval;
1751        }
1752
1753        pm_runtime_get_sync(&ci->gadget.dev);
1754        if (ci->vbus_active) {
1755                hw_device_reset(ci);
1756        } else {
1757                usb_udc_vbus_handler(&ci->gadget, false);
1758                pm_runtime_put_sync(&ci->gadget.dev);
1759                return retval;
1760        }
1761
1762        retval = hw_device_state(ci, ci->ep0out->qh.dma);
1763        if (retval)
1764                pm_runtime_put_sync(&ci->gadget.dev);
1765
1766        return retval;
1767}
1768
1769static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
1770{
1771        if (!ci_otg_is_fsm_mode(ci))
1772                return;
1773
1774        mutex_lock(&ci->fsm.lock);
1775        if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
1776                ci->fsm.a_bidl_adis_tmout = 1;
1777                ci_hdrc_otg_fsm_start(ci);
1778        } else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
1779                ci->fsm.protocol = PROTO_UNDEF;
1780                ci->fsm.otg->state = OTG_STATE_UNDEFINED;
1781        }
1782        mutex_unlock(&ci->fsm.lock);
1783}
1784
1785/**
1786 * ci_udc_stop: unregister a gadget driver
1787 */
1788static int ci_udc_stop(struct usb_gadget *gadget)
1789{
1790        struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
1791        unsigned long flags;
1792
1793        spin_lock_irqsave(&ci->lock, flags);
1794
1795        if (ci->vbus_active) {
1796                hw_device_state(ci, 0);
1797                spin_unlock_irqrestore(&ci->lock, flags);
1798                if (ci->platdata->notify_event)
1799                        ci->platdata->notify_event(ci,
1800                        CI_HDRC_CONTROLLER_STOPPED_EVENT);
1801                _gadget_stop_activity(&ci->gadget);
1802                spin_lock_irqsave(&ci->lock, flags);
1803                pm_runtime_put(&ci->gadget.dev);
1804        }
1805
1806        ci->driver = NULL;
1807        spin_unlock_irqrestore(&ci->lock, flags);
1808
1809        ci_udc_stop_for_otg_fsm(ci);
1810        return 0;
1811}
1812
1813/******************************************************************************
1814 * BUS block
1815 *****************************************************************************/
1816/**
1817 * udc_irq: ci interrupt handler
1818 *
1819 * This function returns IRQ_HANDLED if the IRQ has been handled
1820 * It locks access to registers
1821 */
1822static irqreturn_t udc_irq(struct ci_hdrc *ci)
1823{
1824        irqreturn_t retval;
1825        u32 intr;
1826
1827        if (ci == NULL)
1828                return IRQ_HANDLED;
1829
1830        spin_lock(&ci->lock);
1831
1832        if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
1833                if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
1834                                USBMODE_CM_DC) {
1835                        spin_unlock(&ci->lock);
1836                        return IRQ_NONE;
1837                }
1838        }
1839        intr = hw_test_and_clear_intr_active(ci);
1840
1841        if (intr) {
1842                /* order defines priority - do NOT change it */
1843                if (USBi_URI & intr)
1844                        isr_reset_handler(ci);
1845
1846                if (USBi_PCI & intr) {
1847                        ci->gadget.speed = hw_port_is_high_speed(ci) ?
1848                                USB_SPEED_HIGH : USB_SPEED_FULL;
1849                        if (ci->suspended) {
1850                                if (ci->driver->resume) {
1851                                        spin_unlock(&ci->lock);
1852                                        ci->driver->resume(&ci->gadget);
1853                                        spin_lock(&ci->lock);
1854                                }
1855                                ci->suspended = 0;
1856                                usb_gadget_set_state(&ci->gadget,
1857                                                ci->resume_state);
1858                        }
1859                }
1860
1861                if (USBi_UI  & intr)
1862                        isr_tr_complete_handler(ci);
1863
1864                if ((USBi_SLI & intr) && !(ci->suspended)) {
1865                        ci->suspended = 1;
1866                        ci->resume_state = ci->gadget.state;
1867                        if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
1868                            ci->driver->suspend) {
1869                                spin_unlock(&ci->lock);
1870                                ci->driver->suspend(&ci->gadget);
1871                                spin_lock(&ci->lock);
1872                        }
1873                        usb_gadget_set_state(&ci->gadget,
1874                                        USB_STATE_SUSPENDED);
1875                }
1876                retval = IRQ_HANDLED;
1877        } else {
1878                retval = IRQ_NONE;
1879        }
1880        spin_unlock(&ci->lock);
1881
1882        return retval;
1883}
1884
1885/**
1886 * udc_start: initialize gadget role
1887 * @ci: chipidea controller
1888 */
1889static int udc_start(struct ci_hdrc *ci)
1890{
1891        struct device *dev = ci->dev;
1892        struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
1893        int retval = 0;
1894
1895        ci->gadget.ops          = &usb_gadget_ops;
1896        ci->gadget.speed        = USB_SPEED_UNKNOWN;
1897        ci->gadget.max_speed    = USB_SPEED_HIGH;
1898        ci->gadget.name         = ci->platdata->name;
1899        ci->gadget.otg_caps     = otg_caps;
1900
1901        if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA)
1902                ci->gadget.quirk_avoids_skb_reserve = 1;
1903
1904        if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
1905                                                otg_caps->adp_support))
1906                ci->gadget.is_otg = 1;
1907
1908        INIT_LIST_HEAD(&ci->gadget.ep_list);
1909
1910        /* alloc resources */
1911        ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
1912                                       sizeof(struct ci_hw_qh),
1913                                       64, CI_HDRC_PAGE_SIZE);
1914        if (ci->qh_pool == NULL)
1915                return -ENOMEM;
1916
1917        ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
1918                                       sizeof(struct ci_hw_td),
1919                                       64, CI_HDRC_PAGE_SIZE);
1920        if (ci->td_pool == NULL) {
1921                retval = -ENOMEM;
1922                goto free_qh_pool;
1923        }
1924
1925        retval = init_eps(ci);
1926        if (retval)
1927                goto free_pools;
1928
1929        ci->gadget.ep0 = &ci->ep0in->ep;
1930
1931        retval = usb_add_gadget_udc(dev, &ci->gadget);
1932        if (retval)
1933                goto destroy_eps;
1934
1935        pm_runtime_no_callbacks(&ci->gadget.dev);
1936        pm_runtime_enable(&ci->gadget.dev);
1937
1938        return retval;
1939
1940destroy_eps:
1941        destroy_eps(ci);
1942free_pools:
1943        dma_pool_destroy(ci->td_pool);
1944free_qh_pool:
1945        dma_pool_destroy(ci->qh_pool);
1946        return retval;
1947}
1948
1949/**
1950 * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
1951 *
1952 * No interrupts active, the IRQ has been released
1953 */
1954void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
1955{
1956        if (!ci->roles[CI_ROLE_GADGET])
1957                return;
1958
1959        usb_del_gadget_udc(&ci->gadget);
1960
1961        destroy_eps(ci);
1962
1963        dma_pool_destroy(ci->td_pool);
1964        dma_pool_destroy(ci->qh_pool);
1965}
1966
1967static int udc_id_switch_for_device(struct ci_hdrc *ci)
1968{
1969        if (ci->platdata->pins_device)
1970                pinctrl_select_state(ci->platdata->pctl,
1971                                     ci->platdata->pins_device);
1972
1973        if (ci->is_otg)
1974                /* Clear and enable BSV irq */
1975                hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
1976                                        OTGSC_BSVIS | OTGSC_BSVIE);
1977
1978        return 0;
1979}
1980
1981static void udc_id_switch_for_host(struct ci_hdrc *ci)
1982{
1983        /*
1984         * host doesn't care B_SESSION_VALID event
1985         * so clear and disbale BSV irq
1986         */
1987        if (ci->is_otg)
1988                hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
1989
1990        ci->vbus_active = 0;
1991
1992        if (ci->platdata->pins_device && ci->platdata->pins_default)
1993                pinctrl_select_state(ci->platdata->pctl,
1994                                     ci->platdata->pins_default);
1995}
1996
1997/**
1998 * ci_hdrc_gadget_init - initialize device related bits
1999 * ci: the controller
2000 *
2001 * This function initializes the gadget, if the device is "device capable".
2002 */
2003int ci_hdrc_gadget_init(struct ci_hdrc *ci)
2004{
2005        struct ci_role_driver *rdrv;
2006        int ret;
2007
2008        if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
2009                return -ENXIO;
2010
2011        rdrv = devm_kzalloc(ci->dev, sizeof(*rdrv), GFP_KERNEL);
2012        if (!rdrv)
2013                return -ENOMEM;
2014
2015        rdrv->start     = udc_id_switch_for_device;
2016        rdrv->stop      = udc_id_switch_for_host;
2017        rdrv->irq       = udc_irq;
2018        rdrv->name      = "gadget";
2019
2020        ret = udc_start(ci);
2021        if (!ret)
2022                ci->roles[CI_ROLE_GADGET] = rdrv;
2023
2024        return ret;
2025}
2026