drivers/usb/gadget/udc/bdc/bdc_udc.c

   1 /*
   2  * bdc_udc.c - BRCM BDC USB3.0 device controller gagdet ops
   3  *
   4  * Copyright (C) 2014 Broadcom Corporation
   5  *
   6  * Author: Ashwini Pahuja
   7  *
   8  * Based on drivers under drivers/usb/gadget/udc/
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the
  12  * Free Software Foundation; either version 2 of the License, or (at your
  13  * option) any later version.
  14  *
  15  */
  16 #include <linux/module.h>
  17 #include <linux/pci.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/kernel.h>
  20 #include <linux/delay.h>
  21 #include <linux/ioport.h>
  22 #include <linux/sched.h>
  23 #include <linux/slab.h>
  24 #include <linux/errno.h>
  25 #include <linux/init.h>
  26 #include <linux/timer.h>
  27 #include <linux/list.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/device.h>
  31 #include <linux/usb/ch9.h>
  32 #include <linux/usb/gadget.h>
  33 #include <linux/usb/otg.h>
  34 #include <linux/pm.h>
  35 #include <linux/io.h>
  36 #include <linux/irq.h>
  37 #include <asm/unaligned.h>
  38 #include <linux/platform_device.h>
  39
  40 #include "bdc.h"
  41 #include "bdc_ep.h"
  42 #include "bdc_cmd.h"
  43 #include "bdc_dbg.h"
  44
  45 static const struct usb_gadget_ops bdc_gadget_ops;
  46
  47 static const char * const conn_speed_str[] =  {
  48         "Not connected",
  49         "Full Speed",
  50         "Low Speed",
  51         "High Speed",
  52         "Super Speed",
  53 };
  54
  55 /* EP0 initial descripror */
  56 static struct usb_endpoint_descriptor bdc_gadget_ep0_desc = {
  57         .bLength = USB_DT_ENDPOINT_SIZE,
  58         .bDescriptorType = USB_DT_ENDPOINT,
  59         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
  60         .bEndpointAddress = 0,
  61         .wMaxPacketSize = cpu_to_le16(EP0_MAX_PKT_SIZE),
  62 };
  63
  64 /* Advance the srr dqp maintained by SW */
  65 static void srr_dqp_index_advc(struct bdc *bdc, u32 srr_num)
  66 {
  67         struct srr *srr;
  68
  69         srr = &bdc->srr;
  70         dev_dbg_ratelimited(bdc->dev, "srr->dqp_index:%d\n", srr->dqp_index);
  71         srr->dqp_index++;
  72         /* rollback to 0 if we are past the last */
  73         if (srr->dqp_index == NUM_SR_ENTRIES)
  74                 srr->dqp_index = 0;
  75 }
  76
  77 /* connect sr */
  78 static void bdc_uspc_connected(struct bdc *bdc)
  79 {
  80         u32 speed, temp;
  81         u32 usppms;
  82         int ret;
  83
  84         temp = bdc_readl(bdc->regs, BDC_USPC);
  85         speed = BDC_PSP(temp);
  86         dev_dbg(bdc->dev, "%s speed=%x\n", __func__, speed);
  87         switch (speed) {
  88         case BDC_SPEED_SS:
  89                 bdc_gadget_ep0_desc.wMaxPacketSize =
  90                                                 cpu_to_le16(EP0_MAX_PKT_SIZE);
  91                 bdc->gadget.ep0->maxpacket = EP0_MAX_PKT_SIZE;
  92                 bdc->gadget.speed = USB_SPEED_SUPER;
  93                 /* Enable U1T in SS mode */
  94                 usppms =  bdc_readl(bdc->regs, BDC_USPPMS);
  95                 usppms &= ~BDC_U1T(0xff);
  96                 usppms |= BDC_U1T(U1_TIMEOUT);
  97                 usppms |= BDC_PORT_W1S;
  98                 bdc_writel(bdc->regs, BDC_USPPMS, usppms);
  99                 break;
 100
 101         case BDC_SPEED_HS:
 102                 bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
 103                 bdc->gadget.ep0->maxpacket = 64;
 104                 bdc->gadget.speed = USB_SPEED_HIGH;
 105                 break;
 106
 107         case BDC_SPEED_FS:
 108                 bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
 109                 bdc->gadget.ep0->maxpacket = 64;
 110                 bdc->gadget.speed = USB_SPEED_FULL;
 111                 break;
 112
 113         case BDC_SPEED_LS:
 114                 bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
 115                 bdc->gadget.ep0->maxpacket = 8;
 116                 bdc->gadget.speed = USB_SPEED_LOW;
 117                 break;
 118         default:
 119                 dev_err(bdc->dev, "UNDEFINED SPEED\n");
 120                 return;
 121         }
 122         dev_dbg(bdc->dev, "connected at %s\n", conn_speed_str[speed]);
 123         /* Now we know the speed, configure ep0 */
 124         bdc->bdc_ep_array[1]->desc = &bdc_gadget_ep0_desc;
 125         ret = bdc_config_ep(bdc, bdc->bdc_ep_array[1]);
 126         if (ret)
 127                 dev_err(bdc->dev, "EP0 config failed\n");
 128         bdc->bdc_ep_array[1]->usb_ep.desc = &bdc_gadget_ep0_desc;
 129         bdc->bdc_ep_array[1]->flags |= BDC_EP_ENABLED;
 130         usb_gadget_set_state(&bdc->gadget, USB_STATE_DEFAULT);
 131 }
 132
 133 /* device got disconnected */
 134 static void bdc_uspc_disconnected(struct bdc *bdc, bool reinit)
 135 {
 136         struct bdc_ep *ep;
 137
 138         dev_dbg(bdc->dev, "%s\n", __func__);
 139         /*
 140          * Only stop ep0 from here, rest of the endpoints will be disabled
 141          * from gadget_disconnect
 142          */
 143         ep = bdc->bdc_ep_array[1];
 144         if (ep && (ep->flags & BDC_EP_ENABLED))
 145                 /* if enabled then stop and remove requests */
 146                 bdc_ep_disable(ep);
 147
 148         if (bdc->gadget_driver && bdc->gadget_driver->disconnect) {
 149                 spin_unlock(&bdc->lock);
 150                 bdc->gadget_driver->disconnect(&bdc->gadget);
 151                 spin_lock(&bdc->lock);
 152         }
 153         /* Set Unknown speed */
 154         bdc->gadget.speed = USB_SPEED_UNKNOWN;
 155         bdc->devstatus &= DEVSTATUS_CLEAR;
 156         bdc->delayed_status = false;
 157         bdc->reinit = reinit;
 158         bdc->test_mode = false;
 159 }
 160
 161 /* TNotify wkaeup timer */
 162 static void bdc_func_wake_timer(struct work_struct *work)
 163 {
 164         struct bdc *bdc = container_of(work, struct bdc, func_wake_notify.work);
 165         unsigned long flags;
 166
 167         dev_dbg(bdc->dev, "%s\n", __func__);
 168         spin_lock_irqsave(&bdc->lock, flags);
 169         /*
 170          * Check if host has started transferring on endpoints
 171          * FUNC_WAKE_ISSUED is cleared when transfer has started after resume
 172         */
 173         if (bdc->devstatus & FUNC_WAKE_ISSUED) {
 174                 dev_dbg(bdc->dev, "FUNC_WAKE_ISSUED FLAG IS STILL SET\n");
 175                 /* flag is still set, so again send func wake */
 176                 bdc_function_wake_fh(bdc, 0);
 177                 schedule_delayed_work(&bdc->func_wake_notify,
 178                                                 msecs_to_jiffies(BDC_TNOTIFY));
 179         }
 180         spin_unlock_irqrestore(&bdc->lock, flags);
 181 }
 182
 183 /* handler for Link state change condition */
 184 static void handle_link_state_change(struct bdc *bdc, u32 uspc)
 185 {
 186         u32 link_state;
 187
 188         dev_dbg(bdc->dev, "Link state change");
 189         link_state = BDC_PST(uspc);
 190         switch (link_state) {
 191         case BDC_LINK_STATE_U3:
 192                 if ((bdc->gadget.speed != USB_SPEED_UNKNOWN) &&
 193                                                 bdc->gadget_driver->suspend) {
 194                         dev_dbg(bdc->dev, "Entered Suspend mode\n");
 195                         spin_unlock(&bdc->lock);
 196                         bdc->devstatus |= DEVICE_SUSPENDED;
 197                         bdc->gadget_driver->suspend(&bdc->gadget);
 198                         spin_lock(&bdc->lock);
 199                 }
 200                 break;
 201         case BDC_LINK_STATE_U0:
 202                 if (bdc->devstatus & REMOTE_WAKEUP_ISSUED) {
 203                                         bdc->devstatus &= ~REMOTE_WAKEUP_ISSUED;
 204                         if (bdc->gadget.speed == USB_SPEED_SUPER) {
 205                                 bdc_function_wake_fh(bdc, 0);
 206                                 bdc->devstatus |= FUNC_WAKE_ISSUED;
 207                                 /*
 208                                  * Start a Notification timer and check if the
 209                                  * Host transferred anything on any of the EPs,
 210                                  * if not then send function wake again every
 211                                  * TNotification secs until host initiates
 212                                  * transfer to BDC, USB3 spec Table 8.13
 213                                 */
 214                                 schedule_delayed_work(
 215                                                 &bdc->func_wake_notify,
 216                                                 msecs_to_jiffies(BDC_TNOTIFY));
 217                                 dev_dbg(bdc->dev, "sched func_wake_notify\n");
 218                         }
 219                 }
 220                 break;
 221
 222         case BDC_LINK_STATE_RESUME:
 223                 dev_dbg(bdc->dev, "Resumed from Suspend\n");
 224                 if (bdc->devstatus & DEVICE_SUSPENDED) {
 225                         bdc->gadget_driver->resume(&bdc->gadget);
 226                         bdc->devstatus &= ~DEVICE_SUSPENDED;
 227                 }
 228                 break;
 229         default:
 230                 dev_dbg(bdc->dev, "link state:%d\n", link_state);
 231         }
 232 }
 233
 234 /* something changes on upstream port, handle it here */
 235 void bdc_sr_uspc(struct bdc *bdc, struct bdc_sr *sreport)
 236 {
 237         u32 clear_flags = 0;
 238         u32 uspc;
 239         bool connected = false;
 240         bool disconn = false;
 241
 242         uspc = bdc_readl(bdc->regs, BDC_USPC);
 243         dev_dbg(bdc->dev, "%s uspc=0x%08x\n", __func__, uspc);
 244
 245         /* Port connect changed */
 246         if (uspc & BDC_PCC) {
 247                 /* Vbus not present, and not connected to Downstream port */
 248                 if ((uspc & BDC_VBC) && !(uspc & BDC_VBS) && !(uspc & BDC_PCS))
 249                         disconn = true;
 250                 else if ((uspc & BDC_PCS) && !BDC_PST(uspc))
 251                         connected = true;
 252         }
 253
 254         /* Change in VBus and VBus is present */
 255         if ((uspc & BDC_VBC) && (uspc & BDC_VBS)) {
 256                 if (bdc->pullup) {
 257                         dev_dbg(bdc->dev, "Do a softconnect\n");
 258                         /* Attached state, do a softconnect */
 259                         bdc_softconn(bdc);
 260                         usb_gadget_set_state(&bdc->gadget, USB_STATE_POWERED);
 261                 }
 262                 clear_flags = BDC_VBC;
 263         } else if ((uspc & BDC_PRS) || (uspc & BDC_PRC) || disconn) {
 264                 /* Hot reset, warm reset, 2.0 bus reset or disconn */
 265                 dev_dbg(bdc->dev, "Port reset or disconn\n");
 266                 bdc_uspc_disconnected(bdc, disconn);
 267                 clear_flags = BDC_PCC|BDC_PCS|BDC_PRS|BDC_PRC;
 268         } else if ((uspc & BDC_PSC) && (uspc & BDC_PCS)) {
 269                 /* Change in Link state */
 270                 handle_link_state_change(bdc, uspc);
 271                 clear_flags = BDC_PSC|BDC_PCS;
 272         }
 273
 274         /*
 275          * In SS we might not have PRC bit set before connection, but in 2.0
 276          * the PRC bit is set before connection, so moving this condition out
 277          * of bus reset to handle both SS/2.0 speeds.
 278          */
 279         if (connected) {
 280                 /* This is the connect event for U0/L0 */
 281                 dev_dbg(bdc->dev, "Connected\n");
 282                 bdc_uspc_connected(bdc);
 283                 bdc->devstatus &= ~(DEVICE_SUSPENDED);
 284         }
 285         uspc = bdc_readl(bdc->regs, BDC_USPC);
 286         uspc &= (~BDC_USPSC_RW);
 287         dev_dbg(bdc->dev, "uspc=%x\n", uspc);
 288         bdc_writel(bdc->regs, BDC_USPC, clear_flags);
 289 }
 290
 291 /* Main interrupt handler for bdc */
 292 static irqreturn_t bdc_udc_interrupt(int irq, void *_bdc)
 293 {
 294         u32 eqp_index, dqp_index, sr_type, srr_int;
 295         struct bdc_sr *sreport;
 296         struct bdc *bdc = _bdc;
 297         u32 status;
 298         int ret;
 299
 300         spin_lock(&bdc->lock);
 301         status = bdc_readl(bdc->regs, BDC_BDCSC);
 302         if (!(status & BDC_GIP)) {
 303                 spin_unlock(&bdc->lock);
 304                 return IRQ_NONE;
 305         }
 306         srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0));
 307         /* Check if the SRR IP bit it set? */
 308         if (!(srr_int & BDC_SRR_IP)) {
 309                 dev_warn(bdc->dev, "Global irq pending but SRR IP is 0\n");
 310                 spin_unlock(&bdc->lock);
 311                 return IRQ_NONE;
 312         }
 313         eqp_index = BDC_SRR_EPI(srr_int);
 314         dqp_index = BDC_SRR_DPI(srr_int);
 315         dev_dbg(bdc->dev,
 316                         "%s eqp_index=%d dqp_index=%d  srr.dqp_index=%d\n\n",
 317                          __func__, eqp_index, dqp_index, bdc->srr.dqp_index);
 318
 319         /* check for ring empty condition */
 320         if (eqp_index == dqp_index) {
 321                 dev_dbg(bdc->dev, "SRR empty?\n");
 322                 spin_unlock(&bdc->lock);
 323                 return IRQ_HANDLED;
 324         }
 325
 326         while (bdc->srr.dqp_index != eqp_index) {
 327                 sreport = &bdc->srr.sr_bds[bdc->srr.dqp_index];
 328                 /* sreport is read before using it */
 329                 rmb();
 330                 sr_type = le32_to_cpu(sreport->offset[3]) & BD_TYPE_BITMASK;
 331                 dev_dbg_ratelimited(bdc->dev, "sr_type=%d\n", sr_type);
 332                 switch (sr_type) {
 333                 case SR_XSF:
 334                         bdc->sr_handler[0](bdc, sreport);
 335                         break;
 336
 337                 case SR_USPC:
 338                         bdc->sr_handler[1](bdc, sreport);
 339                         break;
 340                 default:
 341                         dev_warn(bdc->dev, "SR:%d not handled\n", sr_type);
 342                 }
 343                 /* Advance the srr dqp index */
 344                 srr_dqp_index_advc(bdc, 0);
 345         }
 346         /* update the hw dequeue pointer */
 347         srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0));
 348         srr_int &= ~BDC_SRR_DPI_MASK;
 349         srr_int &= ~(BDC_SRR_RWS|BDC_SRR_RST|BDC_SRR_ISR);
 350         srr_int |= ((bdc->srr.dqp_index) << 16);
 351         srr_int |= BDC_SRR_IP;
 352         bdc_writel(bdc->regs, BDC_SRRINT(0), srr_int);
 353         srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0));
 354         if (bdc->reinit) {
 355                 ret = bdc_reinit(bdc);
 356                 if (ret)
 357                         dev_err(bdc->dev, "err in bdc reinit\n");
 358         }
 359
 360         spin_unlock(&bdc->lock);
 361
 362         return IRQ_HANDLED;
 363 }
 364
 365 /* Gadget ops */
 366 static int bdc_udc_start(struct usb_gadget *gadget,
 367                                 struct usb_gadget_driver *driver)
 368 {
 369         struct bdc *bdc = gadget_to_bdc(gadget);
 370         unsigned long flags;
 371         int ret = 0;
 372
 373         dev_dbg(bdc->dev, "%s()\n", __func__);
 374         spin_lock_irqsave(&bdc->lock, flags);
 375         if (bdc->gadget_driver) {
 376                 dev_err(bdc->dev, "%s is already bound to %s\n",
 377                         bdc->gadget.name,
 378                         bdc->gadget_driver->driver.name);
 379                 ret = -EBUSY;
 380                 goto err;
 381         }
 382         /*
 383          * Run the controller from here and when BDC is connected to
 384          * Host then driver will receive a USPC SR with VBUS present
 385          * and then driver will do a softconnect.
 386         */
 387         ret = bdc_run(bdc);
 388         if (ret) {
 389                 dev_err(bdc->dev, "%s bdc run fail\n", __func__);
 390                 goto err;
 391         }
 392         bdc->gadget_driver = driver;
 393         bdc->gadget.dev.driver = &driver->driver;
 394 err:
 395         spin_unlock_irqrestore(&bdc->lock, flags);
 396
 397         return ret;
 398 }
 399
 400 static int bdc_udc_stop(struct usb_gadget *gadget)
 401 {
 402         struct bdc *bdc = gadget_to_bdc(gadget);
 403         unsigned long flags;
 404
 405         dev_dbg(bdc->dev, "%s()\n", __func__);
 406         spin_lock_irqsave(&bdc->lock, flags);
 407         bdc_stop(bdc);
 408         bdc->gadget_driver = NULL;
 409         bdc->gadget.dev.driver = NULL;
 410         spin_unlock_irqrestore(&bdc->lock, flags);
 411
 412         return 0;
 413 }
 414
 415 static int bdc_udc_pullup(struct usb_gadget *gadget, int is_on)
 416 {
 417         struct bdc *bdc = gadget_to_bdc(gadget);
 418         unsigned long flags;
 419         u32 uspc;
 420
 421         dev_dbg(bdc->dev, "%s() is_on:%d\n", __func__, is_on);
 422         if (!gadget)
 423                 return -EINVAL;
 424
 425         spin_lock_irqsave(&bdc->lock, flags);
 426         if (!is_on) {
 427                 bdc_softdisconn(bdc);
 428                 bdc->pullup = false;
 429         } else {
 430                 /*
 431                  * For a self powered device, we need to wait till we receive
 432                  * a VBUS change and Vbus present event, then if pullup flag
 433                  * is set, then only we present the Termintation.
 434                  */
 435                 bdc->pullup = true;
 436                 /*
 437                  * Check if BDC is already connected to Host i.e Vbus=1,
 438                  * if yes, then present TERM now, this is typical for bus
 439                  * powered devices.
 440                  */
 441                 uspc = bdc_readl(bdc->regs, BDC_USPC);
 442                 if (uspc & BDC_VBS)
 443                         bdc_softconn(bdc);
 444         }
 445         spin_unlock_irqrestore(&bdc->lock, flags);
 446
 447         return 0;
 448 }
 449
 450 static int bdc_udc_set_selfpowered(struct usb_gadget *gadget,
 451                 int is_self)
 452 {
 453         struct bdc              *bdc = gadget_to_bdc(gadget);
 454         unsigned long           flags;
 455
 456         dev_dbg(bdc->dev, "%s()\n", __func__);
 457         gadget->is_selfpowered = (is_self != 0);
 458         spin_lock_irqsave(&bdc->lock, flags);
 459         if (!is_self)
 460                 bdc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
 461         else
 462                 bdc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 463
 464         spin_unlock_irqrestore(&bdc->lock, flags);
 465
 466         return 0;
 467 }
 468
 469 static int bdc_udc_wakeup(struct usb_gadget *gadget)
 470 {
 471         struct bdc *bdc = gadget_to_bdc(gadget);
 472         unsigned long           flags;
 473         u8      link_state;
 474         u32     uspc;
 475         int ret = 0;
 476
 477         dev_dbg(bdc->dev,
 478                 "%s() bdc->devstatus=%08x\n",
 479                 __func__, bdc->devstatus);
 480
 481         if (!(bdc->devstatus & REMOTE_WAKE_ENABLE))
 482                 return  -EOPNOTSUPP;
 483
 484         spin_lock_irqsave(&bdc->lock, flags);
 485         uspc = bdc_readl(bdc->regs, BDC_USPC);
 486         link_state = BDC_PST(uspc);
 487         dev_dbg(bdc->dev, "link_state =%d portsc=%x", link_state, uspc);
 488         if (link_state != BDC_LINK_STATE_U3) {
 489                 dev_warn(bdc->dev,
 490                         "can't wakeup from link state %d\n",
 491                         link_state);
 492                 ret = -EINVAL;
 493                 goto out;
 494         }
 495         if (bdc->gadget.speed == USB_SPEED_SUPER)
 496                 bdc->devstatus |= REMOTE_WAKEUP_ISSUED;
 497
 498         uspc &= ~BDC_PST_MASK;
 499         uspc &= (~BDC_USPSC_RW);
 500         uspc |=  BDC_PST(BDC_LINK_STATE_U0);
 501         uspc |=  BDC_SWS;
 502         bdc_writel(bdc->regs, BDC_USPC, uspc);
 503         uspc = bdc_readl(bdc->regs, BDC_USPC);
 504         link_state = BDC_PST(uspc);
 505         dev_dbg(bdc->dev, "link_state =%d portsc=%x", link_state, uspc);
 506 out:
 507         spin_unlock_irqrestore(&bdc->lock, flags);
 508
 509         return ret;
 510 }
 511
 512 static const struct usb_gadget_ops bdc_gadget_ops = {
 513         .wakeup = bdc_udc_wakeup,
 514         .set_selfpowered = bdc_udc_set_selfpowered,
 515         .pullup = bdc_udc_pullup,
 516         .udc_start = bdc_udc_start,
 517         .udc_stop = bdc_udc_stop,
 518 };
 519
 520 /* Init the gadget interface and register the udc */
 521 int bdc_udc_init(struct bdc *bdc)
 522 {
 523         u32 temp;
 524         int ret;
 525
 526         dev_dbg(bdc->dev, "%s()\n", __func__);
 527         bdc->gadget.ops = &bdc_gadget_ops;
 528         bdc->gadget.max_speed = USB_SPEED_SUPER;
 529         bdc->gadget.speed = USB_SPEED_UNKNOWN;
 530         bdc->gadget.dev.parent = bdc->dev;
 531
 532         bdc->gadget.sg_supported = false;
 533
 534
 535         bdc->gadget.name = BRCM_BDC_NAME;
 536         ret = devm_request_irq(bdc->dev, bdc->irq, bdc_udc_interrupt,
 537                                 IRQF_SHARED , BRCM_BDC_NAME, bdc);
 538         if (ret) {
 539                 dev_err(bdc->dev,
 540                         "failed to request irq #%d %d\n",
 541                         bdc->irq, ret);
 542                 return ret;
 543         }
 544
 545         ret = bdc_init_ep(bdc);
 546         if (ret) {
 547                 dev_err(bdc->dev, "bdc init ep fail: %d\n", ret);
 548                 return ret;
 549         }
 550
 551         ret = usb_add_gadget_udc(bdc->dev, &bdc->gadget);
 552         if (ret) {
 553                 dev_err(bdc->dev, "failed to register udc\n");
 554                 goto err0;
 555         }
 556         usb_gadget_set_state(&bdc->gadget, USB_STATE_NOTATTACHED);
 557         bdc->bdc_ep_array[1]->desc = &bdc_gadget_ep0_desc;
 558         /*
 559          * Allocate bd list for ep0 only, ep0 will be enabled on connect
 560          * status report when the speed is known
 561          */
 562         ret = bdc_ep_enable(bdc->bdc_ep_array[1]);
 563         if (ret) {
 564                 dev_err(bdc->dev, "fail to enable %s\n",
 565                                                 bdc->bdc_ep_array[1]->name);
 566                 goto err1;
 567         }
 568         INIT_DELAYED_WORK(&bdc->func_wake_notify, bdc_func_wake_timer);
 569         /* Enable Interrupts */
 570         temp = bdc_readl(bdc->regs, BDC_BDCSC);
 571         temp |= BDC_GIE;
 572         bdc_writel(bdc->regs, BDC_BDCSC, temp);
 573         return 0;
 574 err1:
 575         usb_del_gadget_udc(&bdc->gadget);
 576 err0:
 577         bdc_free_ep(bdc);
 578
 579         return ret;
 580 }
 581
 582 void bdc_udc_exit(struct bdc *bdc)
 583 {
 584         dev_dbg(bdc->dev, "%s()\n", __func__);
 585         bdc_ep_disable(bdc->bdc_ep_array[1]);
 586         usb_del_gadget_udc(&bdc->gadget);
 587         bdc_free_ep(bdc);
 588 }