drivers/usb/chipidea/core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * core.c - ChipIdea USB IP core family device controller
   4  *
   5  * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
   6  *
   7  * Author: David Lopo
   8  */
   9
  10 /*
  11  * Description: ChipIdea USB IP core family device controller
  12  *
  13  * This driver is composed of several blocks:
  14  * - HW:     hardware interface
  15  * - DBG:    debug facilities (optional)
  16  * - UTIL:   utilities
  17  * - ISR:    interrupts handling
  18  * - ENDPT:  endpoint operations (Gadget API)
  19  * - GADGET: gadget operations (Gadget API)
  20  * - BUS:    bus glue code, bus abstraction layer
  21  *
  22  * Compile Options
  23  * - STALL_IN:  non-empty bulk-in pipes cannot be halted
  24  *              if defined mass storage compliance succeeds but with warnings
  25  *              => case 4: Hi >  Dn
  26  *              => case 5: Hi >  Di
  27  *              => case 8: Hi <> Do
  28  *              if undefined usbtest 13 fails
  29  * - TRACE:     enable function tracing (depends on DEBUG)
  30  *
  31  * Main Features
  32  * - Chapter 9 & Mass Storage Compliance with Gadget File Storage
  33  * - Chapter 9 Compliance with Gadget Zero (STALL_IN undefined)
  34  * - Normal & LPM support
  35  *
  36  * USBTEST Report
  37  * - OK: 0-12, 13 (STALL_IN defined) & 14
  38  * - Not Supported: 15 & 16 (ISO)
  39  *
  40  * TODO List
  41  * - Suspend & Remote Wakeup
  42  */
  43 #include <linux/delay.h>
  44 #include <linux/device.h>
  45 #include <linux/dma-mapping.h>
  46 #include <linux/extcon.h>
  47 #include <linux/phy/phy.h>
  48 #include <linux/platform_device.h>
  49 #include <linux/module.h>
  50 #include <linux/idr.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/io.h>
  53 #include <linux/kernel.h>
  54 #include <linux/slab.h>
  55 #include <linux/pm_runtime.h>
  56 #include <linux/pinctrl/consumer.h>
  57 #include <linux/usb/ch9.h>
  58 #include <linux/usb/gadget.h>
  59 #include <linux/usb/otg.h>
  60 #include <linux/usb/chipidea.h>
  61 #include <linux/usb/of.h>
  62 #include <linux/of.h>
  63 #include <linux/regulator/consumer.h>
  64 #include <linux/usb/ehci_def.h>
  65
  66 #include "ci.h"
  67 #include "udc.h"
  68 #include "bits.h"
  69 #include "host.h"
  70 #include "otg.h"
  71 #include "otg_fsm.h"
  72
  73 /* Controller register map */
  74 static const u8 ci_regs_nolpm[] = {
  75         [CAP_CAPLENGTH]         = 0x00U,
  76         [CAP_HCCPARAMS]         = 0x08U,
  77         [CAP_DCCPARAMS]         = 0x24U,
  78         [CAP_TESTMODE]          = 0x38U,
  79         [OP_USBCMD]             = 0x00U,
  80         [OP_USBSTS]             = 0x04U,
  81         [OP_USBINTR]            = 0x08U,
  82         [OP_DEVICEADDR]         = 0x14U,
  83         [OP_ENDPTLISTADDR]      = 0x18U,
  84         [OP_TTCTRL]             = 0x1CU,
  85         [OP_BURSTSIZE]          = 0x20U,
  86         [OP_ULPI_VIEWPORT]      = 0x30U,
  87         [OP_PORTSC]             = 0x44U,
  88         [OP_DEVLC]              = 0x84U,
  89         [OP_OTGSC]              = 0x64U,
  90         [OP_USBMODE]            = 0x68U,
  91         [OP_ENDPTSETUPSTAT]     = 0x6CU,
  92         [OP_ENDPTPRIME]         = 0x70U,
  93         [OP_ENDPTFLUSH]         = 0x74U,
  94         [OP_ENDPTSTAT]          = 0x78U,
  95         [OP_ENDPTCOMPLETE]      = 0x7CU,
  96         [OP_ENDPTCTRL]          = 0x80U,
  97 };
  98
  99 static const u8 ci_regs_lpm[] = {
 100         [CAP_CAPLENGTH]         = 0x00U,
 101         [CAP_HCCPARAMS]         = 0x08U,
 102         [CAP_DCCPARAMS]         = 0x24U,
 103         [CAP_TESTMODE]          = 0xFCU,
 104         [OP_USBCMD]             = 0x00U,
 105         [OP_USBSTS]             = 0x04U,
 106         [OP_USBINTR]            = 0x08U,
 107         [OP_DEVICEADDR]         = 0x14U,
 108         [OP_ENDPTLISTADDR]      = 0x18U,
 109         [OP_TTCTRL]             = 0x1CU,
 110         [OP_BURSTSIZE]          = 0x20U,
 111         [OP_ULPI_VIEWPORT]      = 0x30U,
 112         [OP_PORTSC]             = 0x44U,
 113         [OP_DEVLC]              = 0x84U,
 114         [OP_OTGSC]              = 0xC4U,
 115         [OP_USBMODE]            = 0xC8U,
 116         [OP_ENDPTSETUPSTAT]     = 0xD8U,
 117         [OP_ENDPTPRIME]         = 0xDCU,
 118         [OP_ENDPTFLUSH]         = 0xE0U,
 119         [OP_ENDPTSTAT]          = 0xE4U,
 120         [OP_ENDPTCOMPLETE]      = 0xE8U,
 121         [OP_ENDPTCTRL]          = 0xECU,
 122 };
 123
 124 static void hw_alloc_regmap(struct ci_hdrc *ci, bool is_lpm)
 125 {
 126         int i;
 127
 128         for (i = 0; i < OP_ENDPTCTRL; i++)
 129                 ci->hw_bank.regmap[i] =
 130                         (i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
 131                         (is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
 132
 133         for (; i <= OP_LAST; i++)
 134                 ci->hw_bank.regmap[i] = ci->hw_bank.op +
 135                         4 * (i - OP_ENDPTCTRL) +
 136                         (is_lpm
 137                          ? ci_regs_lpm[OP_ENDPTCTRL]
 138                          : ci_regs_nolpm[OP_ENDPTCTRL]);
 139
 140 }
 141
 142 static enum ci_revision ci_get_revision(struct ci_hdrc *ci)
 143 {
 144         int ver = hw_read_id_reg(ci, ID_ID, VERSION) >> __ffs(VERSION);
 145         enum ci_revision rev = CI_REVISION_UNKNOWN;
 146
 147         if (ver == 0x2) {
 148                 rev = hw_read_id_reg(ci, ID_ID, REVISION)
 149                         >> __ffs(REVISION);
 150                 rev += CI_REVISION_20;
 151         } else if (ver == 0x0) {
 152                 rev = CI_REVISION_1X;
 153         }
 154
 155         return rev;
 156 }
 157
 158 /**
 159  * hw_read_intr_enable: returns interrupt enable register
 160  *
 161  * @ci: the controller
 162  *
 163  * This function returns register data
 164  */
 165 u32 hw_read_intr_enable(struct ci_hdrc *ci)
 166 {
 167         return hw_read(ci, OP_USBINTR, ~0);
 168 }
 169
 170 /**
 171  * hw_read_intr_status: returns interrupt status register
 172  *
 173  * @ci: the controller
 174  *
 175  * This function returns register data
 176  */
 177 u32 hw_read_intr_status(struct ci_hdrc *ci)
 178 {
 179         return hw_read(ci, OP_USBSTS, ~0);
 180 }
 181
 182 /**
 183  * hw_port_test_set: writes port test mode (execute without interruption)
 184  * @mode: new value
 185  *
 186  * This function returns an error code
 187  */
 188 int hw_port_test_set(struct ci_hdrc *ci, u8 mode)
 189 {
 190         const u8 TEST_MODE_MAX = 7;
 191
 192         if (mode > TEST_MODE_MAX)
 193                 return -EINVAL;
 194
 195         hw_write(ci, OP_PORTSC, PORTSC_PTC, mode << __ffs(PORTSC_PTC));
 196         return 0;
 197 }
 198
 199 /**
 200  * hw_port_test_get: reads port test mode value
 201  *
 202  * @ci: the controller
 203  *
 204  * This function returns port test mode value
 205  */
 206 u8 hw_port_test_get(struct ci_hdrc *ci)
 207 {
 208         return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
 209 }
 210
 211 static void hw_wait_phy_stable(void)
 212 {
 213         /*
 214          * The phy needs some delay to output the stable status from low
 215          * power mode. And for OTGSC, the status inputs are debounced
 216          * using a 1 ms time constant, so, delay 2ms for controller to get
 217          * the stable status, like vbus and id when the phy leaves low power.
 218          */
 219         usleep_range(2000, 2500);
 220 }
 221
 222 /* The PHY enters/leaves low power mode */
 223 static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
 224 {
 225         enum ci_hw_regs reg = ci->hw_bank.lpm ? OP_DEVLC : OP_PORTSC;
 226         bool lpm = !!(hw_read(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm)));
 227
 228         if (enable && !lpm)
 229                 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
 230                                 PORTSC_PHCD(ci->hw_bank.lpm));
 231         else if (!enable && lpm)
 232                 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
 233                                 0);
 234 }
 235
 236 static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
 237 {
 238         u32 reg;
 239
 240         /* bank is a module variable */
 241         ci->hw_bank.abs = base;
 242
 243         ci->hw_bank.cap = ci->hw_bank.abs;
 244         ci->hw_bank.cap += ci->platdata->capoffset;
 245         ci->hw_bank.op = ci->hw_bank.cap + (ioread32(ci->hw_bank.cap) & 0xff);
 246
 247         hw_alloc_regmap(ci, false);
 248         reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
 249                 __ffs(HCCPARAMS_LEN);
 250         ci->hw_bank.lpm  = reg;
 251         if (reg)
 252                 hw_alloc_regmap(ci, !!reg);
 253         ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
 254         ci->hw_bank.size += OP_LAST;
 255         ci->hw_bank.size /= sizeof(u32);
 256
 257         reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
 258                 __ffs(DCCPARAMS_DEN);
 259         ci->hw_ep_max = reg * 2;   /* cache hw ENDPT_MAX */
 260
 261         if (ci->hw_ep_max > ENDPT_MAX)
 262                 return -ENODEV;
 263
 264         ci_hdrc_enter_lpm(ci, false);
 265
 266         /* Disable all interrupts bits */
 267         hw_write(ci, OP_USBINTR, 0xffffffff, 0);
 268
 269         /* Clear all interrupts status bits*/
 270         hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
 271
 272         ci->rev = ci_get_revision(ci);
 273
 274         dev_dbg(ci->dev,
 275                 "ChipIdea HDRC found, revision: %d, lpm: %d; cap: %p op: %p\n",
 276                 ci->rev, ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
 277
 278         /* setup lock mode ? */
 279
 280         /* ENDPTSETUPSTAT is '0' by default */
 281
 282         /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
 283
 284         return 0;
 285 }
 286
 287 void hw_phymode_configure(struct ci_hdrc *ci)
 288 {
 289         u32 portsc, lpm, sts = 0;
 290
 291         switch (ci->platdata->phy_mode) {
 292         case USBPHY_INTERFACE_MODE_UTMI:
 293                 portsc = PORTSC_PTS(PTS_UTMI);
 294                 lpm = DEVLC_PTS(PTS_UTMI);
 295                 break;
 296         case USBPHY_INTERFACE_MODE_UTMIW:
 297                 portsc = PORTSC_PTS(PTS_UTMI) | PORTSC_PTW;
 298                 lpm = DEVLC_PTS(PTS_UTMI) | DEVLC_PTW;
 299                 break;
 300         case USBPHY_INTERFACE_MODE_ULPI:
 301                 portsc = PORTSC_PTS(PTS_ULPI);
 302                 lpm = DEVLC_PTS(PTS_ULPI);
 303                 break;
 304         case USBPHY_INTERFACE_MODE_SERIAL:
 305                 portsc = PORTSC_PTS(PTS_SERIAL);
 306                 lpm = DEVLC_PTS(PTS_SERIAL);
 307                 sts = 1;
 308                 break;
 309         case USBPHY_INTERFACE_MODE_HSIC:
 310                 portsc = PORTSC_PTS(PTS_HSIC);
 311                 lpm = DEVLC_PTS(PTS_HSIC);
 312                 break;
 313         default:
 314                 return;
 315         }
 316
 317         if (ci->hw_bank.lpm) {
 318                 hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
 319                 if (sts)
 320                         hw_write(ci, OP_DEVLC, DEVLC_STS, DEVLC_STS);
 321         } else {
 322                 hw_write(ci, OP_PORTSC, PORTSC_PTS(7) | PORTSC_PTW, portsc);
 323                 if (sts)
 324                         hw_write(ci, OP_PORTSC, PORTSC_STS, PORTSC_STS);
 325         }
 326 }
 327 EXPORT_SYMBOL_GPL(hw_phymode_configure);
 328
 329 /**
 330  * _ci_usb_phy_init: initialize phy taking in account both phy and usb_phy
 331  * interfaces
 332  * @ci: the controller
 333  *
 334  * This function returns an error code if the phy failed to init
 335  */
 336 static int _ci_usb_phy_init(struct ci_hdrc *ci)
 337 {
 338         int ret;
 339
 340         if (ci->phy) {
 341                 ret = phy_init(ci->phy);
 342                 if (ret)
 343                         return ret;
 344
 345                 ret = phy_power_on(ci->phy);
 346                 if (ret) {
 347                         phy_exit(ci->phy);
 348                         return ret;
 349                 }
 350         } else {
 351                 ret = usb_phy_init(ci->usb_phy);
 352         }
 353
 354         return ret;
 355 }
 356
 357 /**
 358  * _ci_usb_phy_exit: deinitialize phy taking in account both phy and usb_phy
 359  * interfaces
 360  * @ci: the controller
 361  */
 362 static void ci_usb_phy_exit(struct ci_hdrc *ci)
 363 {
 364         if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
 365                 return;
 366
 367         if (ci->phy) {
 368                 phy_power_off(ci->phy);
 369                 phy_exit(ci->phy);
 370         } else {
 371                 usb_phy_shutdown(ci->usb_phy);
 372         }
 373 }
 374
 375 /**
 376  * ci_usb_phy_init: initialize phy according to different phy type
 377  * @ci: the controller
 378  *
 379  * This function returns an error code if usb_phy_init has failed
 380  */
 381 static int ci_usb_phy_init(struct ci_hdrc *ci)
 382 {
 383         int ret;
 384
 385         if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
 386                 return 0;
 387
 388         switch (ci->platdata->phy_mode) {
 389         case USBPHY_INTERFACE_MODE_UTMI:
 390         case USBPHY_INTERFACE_MODE_UTMIW:
 391         case USBPHY_INTERFACE_MODE_HSIC:
 392                 ret = _ci_usb_phy_init(ci);
 393                 if (!ret)
 394                         hw_wait_phy_stable();
 395                 else
 396                         return ret;
 397                 hw_phymode_configure(ci);
 398                 break;
 399         case USBPHY_INTERFACE_MODE_ULPI:
 400         case USBPHY_INTERFACE_MODE_SERIAL:
 401                 hw_phymode_configure(ci);
 402                 ret = _ci_usb_phy_init(ci);
 403                 if (ret)
 404                         return ret;
 405                 break;
 406         default:
 407                 ret = _ci_usb_phy_init(ci);
 408                 if (!ret)
 409                         hw_wait_phy_stable();
 410         }
 411
 412         return ret;
 413 }
 414
 415
 416 /**
 417  * ci_platform_configure: do controller configure
 418  * @ci: the controller
 419  *
 420  */
 421 void ci_platform_configure(struct ci_hdrc *ci)
 422 {
 423         bool is_device_mode, is_host_mode;
 424
 425         is_device_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_DC;
 426         is_host_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_HC;
 427
 428         if (is_device_mode) {
 429                 phy_set_mode(ci->phy, PHY_MODE_USB_DEVICE);
 430
 431                 if (ci->platdata->flags & CI_HDRC_DISABLE_DEVICE_STREAMING)
 432                         hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
 433                                  USBMODE_CI_SDIS);
 434         }
 435
 436         if (is_host_mode) {
 437                 phy_set_mode(ci->phy, PHY_MODE_USB_HOST);
 438
 439                 if (ci->platdata->flags & CI_HDRC_DISABLE_HOST_STREAMING)
 440                         hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
 441                                  USBMODE_CI_SDIS);
 442         }
 443
 444         if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) {
 445                 if (ci->hw_bank.lpm)
 446                         hw_write(ci, OP_DEVLC, DEVLC_PFSC, DEVLC_PFSC);
 447                 else
 448                         hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
 449         }
 450
 451         if (ci->platdata->flags & CI_HDRC_SET_NON_ZERO_TTHA)
 452                 hw_write(ci, OP_TTCTRL, TTCTRL_TTHA_MASK, TTCTRL_TTHA);
 453
 454         hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
 455
 456         if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
 457                 hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
 458                         ci->platdata->ahb_burst_config);
 459
 460         /* override burst size, take effect only when ahb_burst_config is 0 */
 461         if (!hw_read_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK)) {
 462                 if (ci->platdata->flags & CI_HDRC_OVERRIDE_TX_BURST)
 463                         hw_write(ci, OP_BURSTSIZE, TX_BURST_MASK,
 464                         ci->platdata->tx_burst_size << __ffs(TX_BURST_MASK));
 465
 466                 if (ci->platdata->flags & CI_HDRC_OVERRIDE_RX_BURST)
 467                         hw_write(ci, OP_BURSTSIZE, RX_BURST_MASK,
 468                                 ci->platdata->rx_burst_size);
 469         }
 470 }
 471
 472 /**
 473  * hw_controller_reset: do controller reset
 474  * @ci: the controller
 475   *
 476  * This function returns an error code
 477  */
 478 static int hw_controller_reset(struct ci_hdrc *ci)
 479 {
 480         int count = 0;
 481
 482         hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
 483         while (hw_read(ci, OP_USBCMD, USBCMD_RST)) {
 484                 udelay(10);
 485                 if (count++ > 1000)
 486                         return -ETIMEDOUT;
 487         }
 488
 489         return 0;
 490 }
 491
 492 /**
 493  * hw_device_reset: resets chip (execute without interruption)
 494  * @ci: the controller
 495  *
 496  * This function returns an error code
 497  */
 498 int hw_device_reset(struct ci_hdrc *ci)
 499 {
 500         int ret;
 501
 502         /* should flush & stop before reset */
 503         hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
 504         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
 505
 506         ret = hw_controller_reset(ci);
 507         if (ret) {
 508                 dev_err(ci->dev, "error resetting controller, ret=%d\n", ret);
 509                 return ret;
 510         }
 511
 512         if (ci->platdata->notify_event) {
 513                 ret = ci->platdata->notify_event(ci,
 514                         CI_HDRC_CONTROLLER_RESET_EVENT);
 515                 if (ret)
 516                         return ret;
 517         }
 518
 519         /* USBMODE should be configured step by step */
 520         hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
 521         hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_DC);
 522         /* HW >= 2.3 */
 523         hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
 524
 525         if (hw_read(ci, OP_USBMODE, USBMODE_CM) != USBMODE_CM_DC) {
 526                 pr_err("cannot enter in %s device mode", ci_role(ci)->name);
 527                 pr_err("lpm = %i", ci->hw_bank.lpm);
 528                 return -ENODEV;
 529         }
 530
 531         ci_platform_configure(ci);
 532
 533         return 0;
 534 }
 535
 536 static irqreturn_t ci_irq(int irq, void *data)
 537 {
 538         struct ci_hdrc *ci = data;
 539         irqreturn_t ret = IRQ_NONE;
 540         u32 otgsc = 0;
 541
 542         if (ci->in_lpm) {
 543                 disable_irq_nosync(irq);
 544                 ci->wakeup_int = true;
 545                 pm_runtime_get(ci->dev);
 546                 return IRQ_HANDLED;
 547         }
 548
 549         if (ci->is_otg) {
 550                 otgsc = hw_read_otgsc(ci, ~0);
 551                 if (ci_otg_is_fsm_mode(ci)) {
 552                         ret = ci_otg_fsm_irq(ci);
 553                         if (ret == IRQ_HANDLED)
 554                                 return ret;
 555                 }
 556         }
 557
 558         /*
 559          * Handle id change interrupt, it indicates device/host function
 560          * switch.
 561          */
 562         if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
 563                 ci->id_event = true;
 564                 /* Clear ID change irq status */
 565                 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
 566                 ci_otg_queue_work(ci);
 567                 return IRQ_HANDLED;
 568         }
 569
 570         /*
 571          * Handle vbus change interrupt, it indicates device connection
 572          * and disconnection events.
 573          */
 574         if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
 575                 ci->b_sess_valid_event = true;
 576                 /* Clear BSV irq */
 577                 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
 578                 ci_otg_queue_work(ci);
 579                 return IRQ_HANDLED;
 580         }
 581
 582         /* Handle device/host interrupt */
 583         if (ci->role != CI_ROLE_END)
 584                 ret = ci_role(ci)->irq(ci);
 585
 586         return ret;
 587 }
 588
 589 static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
 590                              void *ptr)
 591 {
 592         struct ci_hdrc_cable *cbl = container_of(nb, struct ci_hdrc_cable, nb);
 593         struct ci_hdrc *ci = cbl->ci;
 594
 595         cbl->connected = event;
 596         cbl->changed = true;
 597
 598         ci_irq(ci->irq, ci);
 599         return NOTIFY_DONE;
 600 }
 601
 602 static int ci_get_platdata(struct device *dev,
 603                 struct ci_hdrc_platform_data *platdata)
 604 {
 605         struct extcon_dev *ext_vbus, *ext_id;
 606         struct ci_hdrc_cable *cable;
 607         int ret;
 608
 609         if (!platdata->phy_mode)
 610                 platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
 611
 612         if (!platdata->dr_mode)
 613                 platdata->dr_mode = usb_get_dr_mode(dev);
 614
 615         if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
 616                 platdata->dr_mode = USB_DR_MODE_OTG;
 617
 618         if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
 619                 /* Get the vbus regulator */
 620                 platdata->reg_vbus = devm_regulator_get(dev, "vbus");
 621                 if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
 622                         return -EPROBE_DEFER;
 623                 } else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
 624                         /* no vbus regulator is needed */
 625                         platdata->reg_vbus = NULL;
 626                 } else if (IS_ERR(platdata->reg_vbus)) {
 627                         dev_err(dev, "Getting regulator error: %ld\n",
 628                                 PTR_ERR(platdata->reg_vbus));
 629                         return PTR_ERR(platdata->reg_vbus);
 630                 }
 631                 /* Get TPL support */
 632                 if (!platdata->tpl_support)
 633                         platdata->tpl_support =
 634                                 of_usb_host_tpl_support(dev->of_node);
 635         }
 636
 637         if (platdata->dr_mode == USB_DR_MODE_OTG) {
 638                 /* We can support HNP and SRP of OTG 2.0 */
 639                 platdata->ci_otg_caps.otg_rev = 0x0200;
 640                 platdata->ci_otg_caps.hnp_support = true;
 641                 platdata->ci_otg_caps.srp_support = true;
 642
 643                 /* Update otg capabilities by DT properties */
 644                 ret = of_usb_update_otg_caps(dev->of_node,
 645                                         &platdata->ci_otg_caps);
 646                 if (ret)
 647                         return ret;
 648         }
 649
 650         if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
 651                 platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
 652
 653         of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
 654                                      &platdata->phy_clkgate_delay_us);
 655
 656         platdata->itc_setting = 1;
 657
 658         of_property_read_u32(dev->of_node, "itc-setting",
 659                                         &platdata->itc_setting);
 660
 661         ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
 662                                 &platdata->ahb_burst_config);
 663         if (!ret) {
 664                 platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
 665         } else if (ret != -EINVAL) {
 666                 dev_err(dev, "failed to get ahb-burst-config\n");
 667                 return ret;
 668         }
 669
 670         ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
 671                                 &platdata->tx_burst_size);
 672         if (!ret) {
 673                 platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
 674         } else if (ret != -EINVAL) {
 675                 dev_err(dev, "failed to get tx-burst-size-dword\n");
 676                 return ret;
 677         }
 678
 679         ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
 680                                 &platdata->rx_burst_size);
 681         if (!ret) {
 682                 platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
 683         } else if (ret != -EINVAL) {
 684                 dev_err(dev, "failed to get rx-burst-size-dword\n");
 685                 return ret;
 686         }
 687
 688         if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL))
 689                 platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
 690
 691         ext_id = ERR_PTR(-ENODEV);
 692         ext_vbus = ERR_PTR(-ENODEV);
 693         if (of_property_read_bool(dev->of_node, "extcon")) {
 694                 /* Each one of them is not mandatory */
 695                 ext_vbus = extcon_get_edev_by_phandle(dev, 0);
 696                 if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
 697                         return PTR_ERR(ext_vbus);
 698
 699                 ext_id = extcon_get_edev_by_phandle(dev, 1);
 700                 if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
 701                         return PTR_ERR(ext_id);
 702         }
 703
 704         cable = &platdata->vbus_extcon;
 705         cable->nb.notifier_call = ci_cable_notifier;
 706         cable->edev = ext_vbus;
 707
 708         if (!IS_ERR(ext_vbus)) {
 709                 ret = extcon_get_state(cable->edev, EXTCON_USB);
 710                 if (ret)
 711                         cable->connected = true;
 712                 else
 713                         cable->connected = false;
 714         }
 715
 716         cable = &platdata->id_extcon;
 717         cable->nb.notifier_call = ci_cable_notifier;
 718         cable->edev = ext_id;
 719
 720         if (!IS_ERR(ext_id)) {
 721                 ret = extcon_get_state(cable->edev, EXTCON_USB_HOST);
 722                 if (ret)
 723                         cable->connected = true;
 724                 else
 725                         cable->connected = false;
 726         }
 727
 728         platdata->pctl = devm_pinctrl_get(dev);
 729         if (!IS_ERR(platdata->pctl)) {
 730                 struct pinctrl_state *p;
 731
 732                 p = pinctrl_lookup_state(platdata->pctl, "default");
 733                 if (!IS_ERR(p))
 734                         platdata->pins_default = p;
 735
 736                 p = pinctrl_lookup_state(platdata->pctl, "host");
 737                 if (!IS_ERR(p))
 738                         platdata->pins_host = p;
 739
 740                 p = pinctrl_lookup_state(platdata->pctl, "device");
 741                 if (!IS_ERR(p))
 742                         platdata->pins_device = p;
 743         }
 744
 745         return 0;
 746 }
 747
 748 static int ci_extcon_register(struct ci_hdrc *ci)
 749 {
 750         struct ci_hdrc_cable *id, *vbus;
 751         int ret;
 752
 753         id = &ci->platdata->id_extcon;
 754         id->ci = ci;
 755         if (!IS_ERR_OR_NULL(id->edev)) {
 756                 ret = devm_extcon_register_notifier(ci->dev, id->edev,
 757                                                 EXTCON_USB_HOST, &id->nb);
 758                 if (ret < 0) {
 759                         dev_err(ci->dev, "register ID failed\n");
 760                         return ret;
 761                 }
 762         }
 763
 764         vbus = &ci->platdata->vbus_extcon;
 765         vbus->ci = ci;
 766         if (!IS_ERR_OR_NULL(vbus->edev)) {
 767                 ret = devm_extcon_register_notifier(ci->dev, vbus->edev,
 768                                                 EXTCON_USB, &vbus->nb);
 769                 if (ret < 0) {
 770                         dev_err(ci->dev, "register VBUS failed\n");
 771                         return ret;
 772                 }
 773         }
 774
 775         return 0;
 776 }
 777
 778 static DEFINE_IDA(ci_ida);
 779
 780 struct platform_device *ci_hdrc_add_device(struct device *dev,
 781                         struct resource *res, int nres,
 782                         struct ci_hdrc_platform_data *platdata)
 783 {
 784         struct platform_device *pdev;
 785         int id, ret;
 786
 787         ret = ci_get_platdata(dev, platdata);
 788         if (ret)
 789                 return ERR_PTR(ret);
 790
 791         id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
 792         if (id < 0)
 793                 return ERR_PTR(id);
 794
 795         pdev = platform_device_alloc("ci_hdrc", id);
 796         if (!pdev) {
 797                 ret = -ENOMEM;
 798                 goto put_id;
 799         }
 800
 801         pdev->dev.parent = dev;
 802
 803         ret = platform_device_add_resources(pdev, res, nres);
 804         if (ret)
 805                 goto err;
 806
 807         ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
 808         if (ret)
 809                 goto err;
 810
 811         ret = platform_device_add(pdev);
 812         if (ret)
 813                 goto err;
 814
 815         return pdev;
 816
 817 err:
 818         platform_device_put(pdev);
 819 put_id:
 820         ida_simple_remove(&ci_ida, id);
 821         return ERR_PTR(ret);
 822 }
 823 EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
 824
 825 void ci_hdrc_remove_device(struct platform_device *pdev)
 826 {
 827         int id = pdev->id;
 828         platform_device_unregister(pdev);
 829         ida_simple_remove(&ci_ida, id);
 830 }
 831 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
 832
 833 static inline void ci_role_destroy(struct ci_hdrc *ci)
 834 {
 835         ci_hdrc_gadget_destroy(ci);
 836         ci_hdrc_host_destroy(ci);
 837         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
 838                 ci_hdrc_otg_destroy(ci);
 839 }
 840
 841 static void ci_get_otg_capable(struct ci_hdrc *ci)
 842 {
 843         if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
 844                 ci->is_otg = false;
 845         else
 846                 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
 847                                 DCCPARAMS_DC | DCCPARAMS_HC)
 848                                         == (DCCPARAMS_DC | DCCPARAMS_HC));
 849         if (ci->is_otg) {
 850                 dev_dbg(ci->dev, "It is OTG capable controller\n");
 851                 /* Disable and clear all OTG irq */
 852                 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
 853                                                         OTGSC_INT_STATUS_BITS);
 854         }
 855 }
 856
 857 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
 858                           char *buf)
 859 {
 860         struct ci_hdrc *ci = dev_get_drvdata(dev);
 861
 862         if (ci->role != CI_ROLE_END)
 863                 return sprintf(buf, "%s\n", ci_role(ci)->name);
 864
 865         return 0;
 866 }
 867
 868 static ssize_t role_store(struct device *dev,
 869                 struct device_attribute *attr, const char *buf, size_t n)
 870 {
 871         struct ci_hdrc *ci = dev_get_drvdata(dev);
 872         enum ci_role role;
 873         int ret;
 874
 875         if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
 876                 dev_warn(dev, "Current configuration is not dual-role, quit\n");
 877                 return -EPERM;
 878         }
 879
 880         for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
 881                 if (!strncmp(buf, ci->roles[role]->name,
 882                              strlen(ci->roles[role]->name)))
 883                         break;
 884
 885         if (role == CI_ROLE_END || role == ci->role)
 886                 return -EINVAL;
 887
 888         pm_runtime_get_sync(dev);
 889         disable_irq(ci->irq);
 890         ci_role_stop(ci);
 891         ret = ci_role_start(ci, role);
 892         if (!ret && ci->role == CI_ROLE_GADGET)
 893                 ci_handle_vbus_change(ci);
 894         enable_irq(ci->irq);
 895         pm_runtime_put_sync(dev);
 896
 897         return (ret == 0) ? n : ret;
 898 }
 899 static DEVICE_ATTR_RW(role);
 900
 901 static struct attribute *ci_attrs[] = {
 902         &dev_attr_role.attr,
 903         NULL,
 904 };
 905
 906 static const struct attribute_group ci_attr_group = {
 907         .attrs = ci_attrs,
 908 };
 909
 910 static int ci_hdrc_probe(struct platform_device *pdev)
 911 {
 912         struct device   *dev = &pdev->dev;
 913         struct ci_hdrc  *ci;
 914         struct resource *res;
 915         void __iomem    *base;
 916         int             ret;
 917         enum usb_dr_mode dr_mode;
 918
 919         if (!dev_get_platdata(dev)) {
 920                 dev_err(dev, "platform data missing\n");
 921                 return -ENODEV;
 922         }
 923
 924         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 925         base = devm_ioremap_resource(dev, res);
 926         if (IS_ERR(base))
 927                 return PTR_ERR(base);
 928
 929         ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
 930         if (!ci)
 931                 return -ENOMEM;
 932
 933         spin_lock_init(&ci->lock);
 934         ci->dev = dev;
 935         ci->platdata = dev_get_platdata(dev);
 936         ci->imx28_write_fix = !!(ci->platdata->flags &
 937                 CI_HDRC_IMX28_WRITE_FIX);
 938         ci->supports_runtime_pm = !!(ci->platdata->flags &
 939                 CI_HDRC_SUPPORTS_RUNTIME_PM);
 940         platform_set_drvdata(pdev, ci);
 941
 942         ret = hw_device_init(ci, base);
 943         if (ret < 0) {
 944                 dev_err(dev, "can't initialize hardware\n");
 945                 return -ENODEV;
 946         }
 947
 948         ret = ci_ulpi_init(ci);
 949         if (ret)
 950                 return ret;
 951
 952         if (ci->platdata->phy) {
 953                 ci->phy = ci->platdata->phy;
 954         } else if (ci->platdata->usb_phy) {
 955                 ci->usb_phy = ci->platdata->usb_phy;
 956         } else {
 957                 /* Look for a generic PHY first */
 958                 ci->phy = devm_phy_get(dev->parent, "usb-phy");
 959
 960                 if (PTR_ERR(ci->phy) == -EPROBE_DEFER) {
 961                         ret = -EPROBE_DEFER;
 962                         goto ulpi_exit;
 963                 } else if (IS_ERR(ci->phy)) {
 964                         ci->phy = NULL;
 965                 }
 966
 967                 /* Look for a legacy USB PHY from device-tree next */
 968                 if (!ci->phy) {
 969                         ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent,
 970                                                                   "phys", 0);
 971
 972                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
 973                                 ret = -EPROBE_DEFER;
 974                                 goto ulpi_exit;
 975                         } else if (IS_ERR(ci->usb_phy)) {
 976                                 ci->usb_phy = NULL;
 977                         }
 978                 }
 979
 980                 /* Look for any registered legacy USB PHY as last resort */
 981                 if (!ci->phy && !ci->usb_phy) {
 982                         ci->usb_phy = devm_usb_get_phy(dev->parent,
 983                                                        USB_PHY_TYPE_USB2);
 984
 985                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
 986                                 ret = -EPROBE_DEFER;
 987                                 goto ulpi_exit;
 988                         } else if (IS_ERR(ci->usb_phy)) {
 989                                 ci->usb_phy = NULL;
 990                         }
 991                 }
 992
 993                 /* No USB PHY was found in the end */
 994                 if (!ci->phy && !ci->usb_phy) {
 995                         ret = -ENXIO;
 996                         goto ulpi_exit;
 997                 }
 998         }
 999
1000         ret = ci_usb_phy_init(ci);
1001         if (ret) {
1002                 dev_err(dev, "unable to init phy: %d\n", ret);
1003                 return ret;
1004         }
1005
1006         ci->hw_bank.phys = res->start;
1007
1008         ci->irq = platform_get_irq(pdev, 0);
1009         if (ci->irq < 0) {
1010                 dev_err(dev, "missing IRQ\n");
1011                 ret = ci->irq;
1012                 goto deinit_phy;
1013         }
1014
1015         ci_get_otg_capable(ci);
1016
1017         dr_mode = ci->platdata->dr_mode;
1018         /* initialize role(s) before the interrupt is requested */
1019         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
1020                 ret = ci_hdrc_host_init(ci);
1021                 if (ret) {
1022                         if (ret == -ENXIO)
1023                                 dev_info(dev, "doesn't support host\n");
1024                         else
1025                                 goto deinit_phy;
1026                 }
1027         }
1028
1029         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
1030                 ret = ci_hdrc_gadget_init(ci);
1031                 if (ret) {
1032                         if (ret == -ENXIO)
1033                                 dev_info(dev, "doesn't support gadget\n");
1034                         else
1035                                 goto deinit_host;
1036                 }
1037         }
1038
1039         if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
1040                 dev_err(dev, "no supported roles\n");
1041                 ret = -ENODEV;
1042                 goto deinit_gadget;
1043         }
1044
1045         if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
1046                 ret = ci_hdrc_otg_init(ci);
1047                 if (ret) {
1048                         dev_err(dev, "init otg fails, ret = %d\n", ret);
1049                         goto deinit_gadget;
1050                 }
1051         }
1052
1053         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
1054                 if (ci->is_otg) {
1055                         ci->role = ci_otg_role(ci);
1056                         /* Enable ID change irq */
1057                         hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
1058                 } else {
1059                         /*
1060                          * If the controller is not OTG capable, but support
1061                          * role switch, the defalt role is gadget, and the
1062                          * user can switch it through debugfs.
1063                          */
1064                         ci->role = CI_ROLE_GADGET;
1065                 }
1066         } else {
1067                 ci->role = ci->roles[CI_ROLE_HOST]
1068                         ? CI_ROLE_HOST
1069                         : CI_ROLE_GADGET;
1070         }
1071
1072         if (!ci_otg_is_fsm_mode(ci)) {
1073                 /* only update vbus status for peripheral */
1074                 if (ci->role == CI_ROLE_GADGET)
1075                         ci_handle_vbus_change(ci);
1076
1077                 ret = ci_role_start(ci, ci->role);
1078                 if (ret) {
1079                         dev_err(dev, "can't start %s role\n",
1080                                                 ci_role(ci)->name);
1081                         goto stop;
1082                 }
1083         }
1084
1085         ret = devm_request_irq(dev, ci->irq, ci_irq, IRQF_SHARED,
1086                         ci->platdata->name, ci);
1087         if (ret)
1088                 goto stop;
1089
1090         ret = ci_extcon_register(ci);
1091         if (ret)
1092                 goto stop;
1093
1094         if (ci->supports_runtime_pm) {
1095                 pm_runtime_set_active(&pdev->dev);
1096                 pm_runtime_enable(&pdev->dev);
1097                 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
1098                 pm_runtime_mark_last_busy(ci->dev);
1099                 pm_runtime_use_autosuspend(&pdev->dev);
1100         }
1101
1102         if (ci_otg_is_fsm_mode(ci))
1103                 ci_hdrc_otg_fsm_start(ci);
1104
1105         device_set_wakeup_capable(&pdev->dev, true);
1106         dbg_create_files(ci);
1107
1108         ret = sysfs_create_group(&dev->kobj, &ci_attr_group);
1109         if (ret)
1110                 goto remove_debug;
1111
1112         return 0;
1113
1114 remove_debug:
1115         dbg_remove_files(ci);
1116 stop:
1117         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
1118                 ci_hdrc_otg_destroy(ci);
1119 deinit_gadget:
1120         ci_hdrc_gadget_destroy(ci);
1121 deinit_host:
1122         ci_hdrc_host_destroy(ci);
1123 deinit_phy:
1124         ci_usb_phy_exit(ci);
1125 ulpi_exit:
1126         ci_ulpi_exit(ci);
1127
1128         return ret;
1129 }
1130
1131 static int ci_hdrc_remove(struct platform_device *pdev)
1132 {
1133         struct ci_hdrc *ci = platform_get_drvdata(pdev);
1134
1135         if (ci->supports_runtime_pm) {
1136                 pm_runtime_get_sync(&pdev->dev);
1137                 pm_runtime_disable(&pdev->dev);
1138                 pm_runtime_put_noidle(&pdev->dev);
1139         }
1140
1141         dbg_remove_files(ci);
1142         sysfs_remove_group(&ci->dev->kobj, &ci_attr_group);
1143         ci_role_destroy(ci);
1144         ci_hdrc_enter_lpm(ci, true);
1145         ci_usb_phy_exit(ci);
1146         ci_ulpi_exit(ci);
1147
1148         return 0;
1149 }
1150
1151 #ifdef CONFIG_PM
1152 /* Prepare wakeup by SRP before suspend */
1153 static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
1154 {
1155         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1156                                 !hw_read_otgsc(ci, OTGSC_ID)) {
1157                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
1158                                                                 PORTSC_PP);
1159                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
1160                                                                 PORTSC_WKCN);
1161         }
1162 }
1163
1164 /* Handle SRP when wakeup by data pulse */
1165 static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
1166 {
1167         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1168                 (ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
1169                 if (!hw_read_otgsc(ci, OTGSC_ID)) {
1170                         ci->fsm.a_srp_det = 1;
1171                         ci->fsm.a_bus_drop = 0;
1172                 } else {
1173                         ci->fsm.id = 1;
1174                 }
1175                 ci_otg_queue_work(ci);
1176         }
1177 }
1178
1179 static void ci_controller_suspend(struct ci_hdrc *ci)
1180 {
1181         disable_irq(ci->irq);
1182         ci_hdrc_enter_lpm(ci, true);
1183         if (ci->platdata->phy_clkgate_delay_us)
1184                 usleep_range(ci->platdata->phy_clkgate_delay_us,
1185                              ci->platdata->phy_clkgate_delay_us + 50);
1186         usb_phy_set_suspend(ci->usb_phy, 1);
1187         ci->in_lpm = true;
1188         enable_irq(ci->irq);
1189 }
1190
1191 static int ci_controller_resume(struct device *dev)
1192 {
1193         struct ci_hdrc *ci = dev_get_drvdata(dev);
1194         int ret;
1195
1196         dev_dbg(dev, "at %s\n", __func__);
1197
1198         if (!ci->in_lpm) {
1199                 WARN_ON(1);
1200                 return 0;
1201         }
1202
1203         ci_hdrc_enter_lpm(ci, false);
1204
1205         ret = ci_ulpi_resume(ci);
1206         if (ret)
1207                 return ret;
1208
1209         if (ci->usb_phy) {
1210                 usb_phy_set_suspend(ci->usb_phy, 0);
1211                 usb_phy_set_wakeup(ci->usb_phy, false);
1212                 hw_wait_phy_stable();
1213         }
1214
1215         ci->in_lpm = false;
1216         if (ci->wakeup_int) {
1217                 ci->wakeup_int = false;
1218                 pm_runtime_mark_last_busy(ci->dev);
1219                 pm_runtime_put_autosuspend(ci->dev);
1220                 enable_irq(ci->irq);
1221                 if (ci_otg_is_fsm_mode(ci))
1222                         ci_otg_fsm_wakeup_by_srp(ci);
1223         }
1224
1225         return 0;
1226 }
1227
1228 #ifdef CONFIG_PM_SLEEP
1229 static int ci_suspend(struct device *dev)
1230 {
1231         struct ci_hdrc *ci = dev_get_drvdata(dev);
1232
1233         if (ci->wq)
1234                 flush_workqueue(ci->wq);
1235         /*
1236          * Controller needs to be active during suspend, otherwise the core
1237          * may run resume when the parent is at suspend if other driver's
1238          * suspend fails, it occurs before parent's suspend has not started,
1239          * but the core suspend has finished.
1240          */
1241         if (ci->in_lpm)
1242                 pm_runtime_resume(dev);
1243
1244         if (ci->in_lpm) {
1245                 WARN_ON(1);
1246                 return 0;
1247         }
1248
1249         if (device_may_wakeup(dev)) {
1250                 if (ci_otg_is_fsm_mode(ci))
1251                         ci_otg_fsm_suspend_for_srp(ci);
1252
1253                 usb_phy_set_wakeup(ci->usb_phy, true);
1254                 enable_irq_wake(ci->irq);
1255         }
1256
1257         ci_controller_suspend(ci);
1258
1259         return 0;
1260 }
1261
1262 static int ci_resume(struct device *dev)
1263 {
1264         struct ci_hdrc *ci = dev_get_drvdata(dev);
1265         int ret;
1266
1267         if (device_may_wakeup(dev))
1268                 disable_irq_wake(ci->irq);
1269
1270         ret = ci_controller_resume(dev);
1271         if (ret)
1272                 return ret;
1273
1274         if (ci->supports_runtime_pm) {
1275                 pm_runtime_disable(dev);
1276                 pm_runtime_set_active(dev);
1277                 pm_runtime_enable(dev);
1278         }
1279
1280         return ret;
1281 }
1282 #endif /* CONFIG_PM_SLEEP */
1283
1284 static int ci_runtime_suspend(struct device *dev)
1285 {
1286         struct ci_hdrc *ci = dev_get_drvdata(dev);
1287
1288         dev_dbg(dev, "at %s\n", __func__);
1289
1290         if (ci->in_lpm) {
1291                 WARN_ON(1);
1292                 return 0;
1293         }
1294
1295         if (ci_otg_is_fsm_mode(ci))
1296                 ci_otg_fsm_suspend_for_srp(ci);
1297
1298         usb_phy_set_wakeup(ci->usb_phy, true);
1299         ci_controller_suspend(ci);
1300
1301         return 0;
1302 }
1303
1304 static int ci_runtime_resume(struct device *dev)
1305 {
1306         return ci_controller_resume(dev);
1307 }
1308
1309 #endif /* CONFIG_PM */
1310 static const struct dev_pm_ops ci_pm_ops = {
1311         SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
1312         SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
1313 };
1314
1315 static struct platform_driver ci_hdrc_driver = {
1316         .probe  = ci_hdrc_probe,
1317         .remove = ci_hdrc_remove,
1318         .driver = {
1319                 .name   = "ci_hdrc",
1320                 .pm     = &ci_pm_ops,
1321         },
1322 };
1323
1324 static int __init ci_hdrc_platform_register(void)
1325 {
1326         ci_hdrc_host_driver_init();
1327         return platform_driver_register(&ci_hdrc_driver);
1328 }
1329 module_init(ci_hdrc_platform_register);
1330
1331 static void __exit ci_hdrc_platform_unregister(void)
1332 {
1333         platform_driver_unregister(&ci_hdrc_driver);
1334 }
1335 module_exit(ci_hdrc_platform_unregister);
1336
1337 MODULE_ALIAS("platform:ci_hdrc");
1338 MODULE_LICENSE("GPL v2");
1339 MODULE_AUTHOR("David Lopo <[email protected]>");
1340 MODULE_DESCRIPTION("ChipIdea HDRC Driver");