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  * Copyright (C) 2020 NXP
   7  *
   8  * Author: David Lopo
   9  *         Peter Chen <peter.chen@nxp.com>
  10  *
  11  * Main Features:
  12  * - Four transfers are supported, usbtest is passed
  13  * - USB Certification for gadget: CH9 and Mass Storage are passed
  14  * - Low power mode
  15  * - USB wakeup
  16  */
  17 #include <linux/delay.h>
  18 #include <linux/device.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/extcon.h>
  21 #include <linux/phy/phy.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/module.h>
  24 #include <linux/idr.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/io.h>
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/pm_runtime.h>
  30 #include <linux/pinctrl/consumer.h>
  31 #include <linux/usb/ch9.h>
  32 #include <linux/usb/gadget.h>
  33 #include <linux/usb/otg.h>
  34 #include <linux/usb/chipidea.h>
  35 #include <linux/usb/of.h>
  36 #include <linux/of.h>
  37 #include <linux/regulator/consumer.h>
  38 #include <linux/usb/ehci_def.h>
  39
  40 #include "ci.h"
  41 #include "udc.h"
  42 #include "bits.h"
  43 #include "host.h"
  44 #include "otg.h"
  45 #include "otg_fsm.h"
  46
  47 /* Controller register map */
  48 static const u8 ci_regs_nolpm[] = {
  49         [CAP_CAPLENGTH]         = 0x00U,
  50         [CAP_HCCPARAMS]         = 0x08U,
  51         [CAP_DCCPARAMS]         = 0x24U,
  52         [CAP_TESTMODE]          = 0x38U,
  53         [OP_USBCMD]             = 0x00U,
  54         [OP_USBSTS]             = 0x04U,
  55         [OP_USBINTR]            = 0x08U,
  56         [OP_DEVICEADDR]         = 0x14U,
  57         [OP_ENDPTLISTADDR]      = 0x18U,
  58         [OP_TTCTRL]             = 0x1CU,
  59         [OP_BURSTSIZE]          = 0x20U,
  60         [OP_ULPI_VIEWPORT]      = 0x30U,
  61         [OP_PORTSC]             = 0x44U,
  62         [OP_DEVLC]              = 0x84U,
  63         [OP_OTGSC]              = 0x64U,
  64         [OP_USBMODE]            = 0x68U,
  65         [OP_ENDPTSETUPSTAT]     = 0x6CU,
  66         [OP_ENDPTPRIME]         = 0x70U,
  67         [OP_ENDPTFLUSH]         = 0x74U,
  68         [OP_ENDPTSTAT]          = 0x78U,
  69         [OP_ENDPTCOMPLETE]      = 0x7CU,
  70         [OP_ENDPTCTRL]          = 0x80U,
  71 };
  72
  73 static const u8 ci_regs_lpm[] = {
  74         [CAP_CAPLENGTH]         = 0x00U,
  75         [CAP_HCCPARAMS]         = 0x08U,
  76         [CAP_DCCPARAMS]         = 0x24U,
  77         [CAP_TESTMODE]          = 0xFCU,
  78         [OP_USBCMD]             = 0x00U,
  79         [OP_USBSTS]             = 0x04U,
  80         [OP_USBINTR]            = 0x08U,
  81         [OP_DEVICEADDR]         = 0x14U,
  82         [OP_ENDPTLISTADDR]      = 0x18U,
  83         [OP_TTCTRL]             = 0x1CU,
  84         [OP_BURSTSIZE]          = 0x20U,
  85         [OP_ULPI_VIEWPORT]      = 0x30U,
  86         [OP_PORTSC]             = 0x44U,
  87         [OP_DEVLC]              = 0x84U,
  88         [OP_OTGSC]              = 0xC4U,
  89         [OP_USBMODE]            = 0xC8U,
  90         [OP_ENDPTSETUPSTAT]     = 0xD8U,
  91         [OP_ENDPTPRIME]         = 0xDCU,
  92         [OP_ENDPTFLUSH]         = 0xE0U,
  93         [OP_ENDPTSTAT]          = 0xE4U,
  94         [OP_ENDPTCOMPLETE]      = 0xE8U,
  95         [OP_ENDPTCTRL]          = 0xECU,
  96 };
  97
  98 static void hw_alloc_regmap(struct ci_hdrc *ci, bool is_lpm)
  99 {
 100         int i;
 101
 102         for (i = 0; i < OP_ENDPTCTRL; i++)
 103                 ci->hw_bank.regmap[i] =
 104                         (i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
 105                         (is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
 106
 107         for (; i <= OP_LAST; i++)
 108                 ci->hw_bank.regmap[i] = ci->hw_bank.op +
 109                         4 * (i - OP_ENDPTCTRL) +
 110                         (is_lpm
 111                          ? ci_regs_lpm[OP_ENDPTCTRL]
 112                          : ci_regs_nolpm[OP_ENDPTCTRL]);
 113
 114 }
 115
 116 static enum ci_revision ci_get_revision(struct ci_hdrc *ci)
 117 {
 118         int ver = hw_read_id_reg(ci, ID_ID, VERSION) >> __ffs(VERSION);
 119         enum ci_revision rev = CI_REVISION_UNKNOWN;
 120
 121         if (ver == 0x2) {
 122                 rev = hw_read_id_reg(ci, ID_ID, REVISION)
 123                         >> __ffs(REVISION);
 124                 rev += CI_REVISION_20;
 125         } else if (ver == 0x0) {
 126                 rev = CI_REVISION_1X;
 127         }
 128
 129         return rev;
 130 }
 131
 132 /**
 133  * hw_read_intr_enable: returns interrupt enable register
 134  *
 135  * @ci: the controller
 136  *
 137  * This function returns register data
 138  */
 139 u32 hw_read_intr_enable(struct ci_hdrc *ci)
 140 {
 141         return hw_read(ci, OP_USBINTR, ~0);
 142 }
 143
 144 /**
 145  * hw_read_intr_status: returns interrupt status register
 146  *
 147  * @ci: the controller
 148  *
 149  * This function returns register data
 150  */
 151 u32 hw_read_intr_status(struct ci_hdrc *ci)
 152 {
 153         return hw_read(ci, OP_USBSTS, ~0);
 154 }
 155
 156 /**
 157  * hw_port_test_set: writes port test mode (execute without interruption)
 158  * @ci: the controller
 159  * @mode: new value
 160  *
 161  * This function returns an error code
 162  */
 163 int hw_port_test_set(struct ci_hdrc *ci, u8 mode)
 164 {
 165         const u8 TEST_MODE_MAX = 7;
 166
 167         if (mode > TEST_MODE_MAX)
 168                 return -EINVAL;
 169
 170         hw_write(ci, OP_PORTSC, PORTSC_PTC, mode << __ffs(PORTSC_PTC));
 171         return 0;
 172 }
 173
 174 /**
 175  * hw_port_test_get: reads port test mode value
 176  *
 177  * @ci: the controller
 178  *
 179  * This function returns port test mode value
 180  */
 181 u8 hw_port_test_get(struct ci_hdrc *ci)
 182 {
 183         return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
 184 }
 185
 186 static void hw_wait_phy_stable(void)
 187 {
 188         /*
 189          * The phy needs some delay to output the stable status from low
 190          * power mode. And for OTGSC, the status inputs are debounced
 191          * using a 1 ms time constant, so, delay 2ms for controller to get
 192          * the stable status, like vbus and id when the phy leaves low power.
 193          */
 194         usleep_range(2000, 2500);
 195 }
 196
 197 /* The PHY enters/leaves low power mode */
 198 static void ci_hdrc_enter_lpm_common(struct ci_hdrc *ci, bool enable)
 199 {
 200         enum ci_hw_regs reg = ci->hw_bank.lpm ? OP_DEVLC : OP_PORTSC;
 201         bool lpm = !!(hw_read(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm)));
 202
 203         if (enable && !lpm)
 204                 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
 205                                 PORTSC_PHCD(ci->hw_bank.lpm));
 206         else if (!enable && lpm)
 207                 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
 208                                 0);
 209 }
 210
 211 static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
 212 {
 213         return ci->platdata->enter_lpm(ci, enable);
 214 }
 215
 216 static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
 217 {
 218         u32 reg;
 219
 220         /* bank is a module variable */
 221         ci->hw_bank.abs = base;
 222
 223         ci->hw_bank.cap = ci->hw_bank.abs;
 224         ci->hw_bank.cap += ci->platdata->capoffset;
 225         ci->hw_bank.op = ci->hw_bank.cap + (ioread32(ci->hw_bank.cap) & 0xff);
 226
 227         hw_alloc_regmap(ci, false);
 228         reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
 229                 __ffs(HCCPARAMS_LEN);
 230         ci->hw_bank.lpm  = reg;
 231         if (reg)
 232                 hw_alloc_regmap(ci, !!reg);
 233         ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
 234         ci->hw_bank.size += OP_LAST;
 235         ci->hw_bank.size /= sizeof(u32);
 236
 237         reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
 238                 __ffs(DCCPARAMS_DEN);
 239         ci->hw_ep_max = reg * 2;   /* cache hw ENDPT_MAX */
 240
 241         if (ci->hw_ep_max > ENDPT_MAX)
 242                 return -ENODEV;
 243
 244         ci_hdrc_enter_lpm(ci, false);
 245
 246         /* Disable all interrupts bits */
 247         hw_write(ci, OP_USBINTR, 0xffffffff, 0);
 248
 249         /* Clear all interrupts status bits*/
 250         hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
 251
 252         ci->rev = ci_get_revision(ci);
 253
 254         dev_dbg(ci->dev,
 255                 "revision: %d, lpm: %d; cap: %px op: %px\n",
 256                 ci->rev, ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
 257
 258         /* setup lock mode ? */
 259
 260         /* ENDPTSETUPSTAT is '0' by default */
 261
 262         /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
 263
 264         return 0;
 265 }
 266
 267 void hw_phymode_configure(struct ci_hdrc *ci)
 268 {
 269         u32 portsc, lpm, sts = 0;
 270
 271         switch (ci->platdata->phy_mode) {
 272         case USBPHY_INTERFACE_MODE_UTMI:
 273                 portsc = PORTSC_PTS(PTS_UTMI);
 274                 lpm = DEVLC_PTS(PTS_UTMI);
 275                 break;
 276         case USBPHY_INTERFACE_MODE_UTMIW:
 277                 portsc = PORTSC_PTS(PTS_UTMI) | PORTSC_PTW;
 278                 lpm = DEVLC_PTS(PTS_UTMI) | DEVLC_PTW;
 279                 break;
 280         case USBPHY_INTERFACE_MODE_ULPI:
 281                 portsc = PORTSC_PTS(PTS_ULPI);
 282                 lpm = DEVLC_PTS(PTS_ULPI);
 283                 break;
 284         case USBPHY_INTERFACE_MODE_SERIAL:
 285                 portsc = PORTSC_PTS(PTS_SERIAL);
 286                 lpm = DEVLC_PTS(PTS_SERIAL);
 287                 sts = 1;
 288                 break;
 289         case USBPHY_INTERFACE_MODE_HSIC:
 290                 portsc = PORTSC_PTS(PTS_HSIC);
 291                 lpm = DEVLC_PTS(PTS_HSIC);
 292                 break;
 293         default:
 294                 return;
 295         }
 296
 297         if (ci->hw_bank.lpm) {
 298                 hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
 299                 if (sts)
 300                         hw_write(ci, OP_DEVLC, DEVLC_STS, DEVLC_STS);
 301         } else {
 302                 hw_write(ci, OP_PORTSC, PORTSC_PTS(7) | PORTSC_PTW, portsc);
 303                 if (sts)
 304                         hw_write(ci, OP_PORTSC, PORTSC_STS, PORTSC_STS);
 305         }
 306 }
 307 EXPORT_SYMBOL_GPL(hw_phymode_configure);
 308
 309 /**
 310  * _ci_usb_phy_init: initialize phy taking in account both phy and usb_phy
 311  * interfaces
 312  * @ci: the controller
 313  *
 314  * This function returns an error code if the phy failed to init
 315  */
 316 static int _ci_usb_phy_init(struct ci_hdrc *ci)
 317 {
 318         int ret;
 319
 320         if (ci->phy) {
 321                 ret = phy_init(ci->phy);
 322                 if (ret)
 323                         return ret;
 324
 325                 ret = phy_power_on(ci->phy);
 326                 if (ret) {
 327                         phy_exit(ci->phy);
 328                         return ret;
 329                 }
 330         } else {
 331                 ret = usb_phy_init(ci->usb_phy);
 332         }
 333
 334         return ret;
 335 }
 336
 337 /**
 338  * ci_usb_phy_exit: deinitialize phy taking in account both phy and usb_phy
 339  * interfaces
 340  * @ci: the controller
 341  */
 342 static void ci_usb_phy_exit(struct ci_hdrc *ci)
 343 {
 344         if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
 345                 return;
 346
 347         if (ci->phy) {
 348                 phy_power_off(ci->phy);
 349                 phy_exit(ci->phy);
 350         } else {
 351                 usb_phy_shutdown(ci->usb_phy);
 352         }
 353 }
 354
 355 /**
 356  * ci_usb_phy_init: initialize phy according to different phy type
 357  * @ci: the controller
 358  *
 359  * This function returns an error code if usb_phy_init has failed
 360  */
 361 static int ci_usb_phy_init(struct ci_hdrc *ci)
 362 {
 363         int ret;
 364
 365         if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
 366                 return 0;
 367
 368         switch (ci->platdata->phy_mode) {
 369         case USBPHY_INTERFACE_MODE_UTMI:
 370         case USBPHY_INTERFACE_MODE_UTMIW:
 371         case USBPHY_INTERFACE_MODE_HSIC:
 372                 ret = _ci_usb_phy_init(ci);
 373                 if (!ret)
 374                         hw_wait_phy_stable();
 375                 else
 376                         return ret;
 377                 hw_phymode_configure(ci);
 378                 break;
 379         case USBPHY_INTERFACE_MODE_ULPI:
 380         case USBPHY_INTERFACE_MODE_SERIAL:
 381                 hw_phymode_configure(ci);
 382                 ret = _ci_usb_phy_init(ci);
 383                 if (ret)
 384                         return ret;
 385                 break;
 386         default:
 387                 ret = _ci_usb_phy_init(ci);
 388                 if (!ret)
 389                         hw_wait_phy_stable();
 390         }
 391
 392         return ret;
 393 }
 394
 395
 396 /**
 397  * ci_platform_configure: do controller configure
 398  * @ci: the controller
 399  *
 400  */
 401 void ci_platform_configure(struct ci_hdrc *ci)
 402 {
 403         bool is_device_mode, is_host_mode;
 404
 405         is_device_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_DC;
 406         is_host_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_HC;
 407
 408         if (is_device_mode) {
 409                 phy_set_mode(ci->phy, PHY_MODE_USB_DEVICE);
 410
 411                 if (ci->platdata->flags & CI_HDRC_DISABLE_DEVICE_STREAMING)
 412                         hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
 413                                  USBMODE_CI_SDIS);
 414         }
 415
 416         if (is_host_mode) {
 417                 phy_set_mode(ci->phy, PHY_MODE_USB_HOST);
 418
 419                 if (ci->platdata->flags & CI_HDRC_DISABLE_HOST_STREAMING)
 420                         hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
 421                                  USBMODE_CI_SDIS);
 422         }
 423
 424         if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) {
 425                 if (ci->hw_bank.lpm)
 426                         hw_write(ci, OP_DEVLC, DEVLC_PFSC, DEVLC_PFSC);
 427                 else
 428                         hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
 429         }
 430
 431         if (ci->platdata->flags & CI_HDRC_SET_NON_ZERO_TTHA)
 432                 hw_write(ci, OP_TTCTRL, TTCTRL_TTHA_MASK, TTCTRL_TTHA);
 433
 434         hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
 435
 436         if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
 437                 hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
 438                         ci->platdata->ahb_burst_config);
 439
 440         /* override burst size, take effect only when ahb_burst_config is 0 */
 441         if (!hw_read_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK)) {
 442                 if (ci->platdata->flags & CI_HDRC_OVERRIDE_TX_BURST)
 443                         hw_write(ci, OP_BURSTSIZE, TX_BURST_MASK,
 444                         ci->platdata->tx_burst_size << __ffs(TX_BURST_MASK));
 445
 446                 if (ci->platdata->flags & CI_HDRC_OVERRIDE_RX_BURST)
 447                         hw_write(ci, OP_BURSTSIZE, RX_BURST_MASK,
 448                                 ci->platdata->rx_burst_size);
 449         }
 450 }
 451
 452 /**
 453  * hw_controller_reset: do controller reset
 454  * @ci: the controller
 455   *
 456  * This function returns an error code
 457  */
 458 static int hw_controller_reset(struct ci_hdrc *ci)
 459 {
 460         int count = 0;
 461
 462         hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
 463         while (hw_read(ci, OP_USBCMD, USBCMD_RST)) {
 464                 udelay(10);
 465                 if (count++ > 1000)
 466                         return -ETIMEDOUT;
 467         }
 468
 469         return 0;
 470 }
 471
 472 /**
 473  * hw_device_reset: resets chip (execute without interruption)
 474  * @ci: the controller
 475  *
 476  * This function returns an error code
 477  */
 478 int hw_device_reset(struct ci_hdrc *ci)
 479 {
 480         int ret;
 481
 482         /* should flush & stop before reset */
 483         hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
 484         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
 485
 486         ret = hw_controller_reset(ci);
 487         if (ret) {
 488                 dev_err(ci->dev, "error resetting controller, ret=%d\n", ret);
 489                 return ret;
 490         }
 491
 492         if (ci->platdata->notify_event) {
 493                 ret = ci->platdata->notify_event(ci,
 494                         CI_HDRC_CONTROLLER_RESET_EVENT);
 495                 if (ret)
 496                         return ret;
 497         }
 498
 499         /* USBMODE should be configured step by step */
 500         hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
 501         hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_DC);
 502         /* HW >= 2.3 */
 503         hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
 504
 505         if (hw_read(ci, OP_USBMODE, USBMODE_CM) != USBMODE_CM_DC) {
 506                 dev_err(ci->dev, "cannot enter in %s device mode\n",
 507                         ci_role(ci)->name);
 508                 dev_err(ci->dev, "lpm = %i\n", ci->hw_bank.lpm);
 509                 return -ENODEV;
 510         }
 511
 512         ci_platform_configure(ci);
 513
 514         return 0;
 515 }
 516
 517 static irqreturn_t ci_irq_handler(int irq, void *data)
 518 {
 519         struct ci_hdrc *ci = data;
 520         irqreturn_t ret = IRQ_NONE;
 521         u32 otgsc = 0;
 522
 523         if (ci->in_lpm) {
 524                 disable_irq_nosync(irq);
 525                 ci->wakeup_int = true;
 526                 pm_runtime_get(ci->dev);
 527                 return IRQ_HANDLED;
 528         }
 529
 530         if (ci->is_otg) {
 531                 otgsc = hw_read_otgsc(ci, ~0);
 532                 if (ci_otg_is_fsm_mode(ci)) {
 533                         ret = ci_otg_fsm_irq(ci);
 534                         if (ret == IRQ_HANDLED)
 535                                 return ret;
 536                 }
 537         }
 538
 539         /*
 540          * Handle id change interrupt, it indicates device/host function
 541          * switch.
 542          */
 543         if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
 544                 ci->id_event = true;
 545                 /* Clear ID change irq status */
 546                 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
 547                 ci_otg_queue_work(ci);
 548                 return IRQ_HANDLED;
 549         }
 550
 551         /*
 552          * Handle vbus change interrupt, it indicates device connection
 553          * and disconnection events.
 554          */
 555         if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
 556                 ci->b_sess_valid_event = true;
 557                 /* Clear BSV irq */
 558                 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
 559                 ci_otg_queue_work(ci);
 560                 return IRQ_HANDLED;
 561         }
 562
 563         /* Handle device/host interrupt */
 564         if (ci->role != CI_ROLE_END)
 565                 ret = ci_role(ci)->irq(ci);
 566
 567         return ret;
 568 }
 569
 570 static void ci_irq(struct ci_hdrc *ci)
 571 {
 572         unsigned long flags;
 573
 574         local_irq_save(flags);
 575         ci_irq_handler(ci->irq, ci);
 576         local_irq_restore(flags);
 577 }
 578
 579 static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
 580                              void *ptr)
 581 {
 582         struct ci_hdrc_cable *cbl = container_of(nb, struct ci_hdrc_cable, nb);
 583         struct ci_hdrc *ci = cbl->ci;
 584
 585         cbl->connected = event;
 586         cbl->changed = true;
 587
 588         ci_irq(ci);
 589         return NOTIFY_DONE;
 590 }
 591
 592 static enum usb_role ci_usb_role_switch_get(struct usb_role_switch *sw)
 593 {
 594         struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
 595         enum usb_role role;
 596         unsigned long flags;
 597
 598         spin_lock_irqsave(&ci->lock, flags);
 599         role = ci_role_to_usb_role(ci);
 600         spin_unlock_irqrestore(&ci->lock, flags);
 601
 602         return role;
 603 }
 604
 605 static int ci_usb_role_switch_set(struct usb_role_switch *sw,
 606                                   enum usb_role role)
 607 {
 608         struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
 609         struct ci_hdrc_cable *cable = NULL;
 610         enum usb_role current_role = ci_role_to_usb_role(ci);
 611         enum ci_role ci_role = usb_role_to_ci_role(role);
 612         unsigned long flags;
 613
 614         if ((ci_role != CI_ROLE_END && !ci->roles[ci_role]) ||
 615             (current_role == role))
 616                 return 0;
 617
 618         pm_runtime_get_sync(ci->dev);
 619         /* Stop current role */
 620         spin_lock_irqsave(&ci->lock, flags);
 621         if (current_role == USB_ROLE_DEVICE)
 622                 cable = &ci->platdata->vbus_extcon;
 623         else if (current_role == USB_ROLE_HOST)
 624                 cable = &ci->platdata->id_extcon;
 625
 626         if (cable) {
 627                 cable->changed = true;
 628                 cable->connected = false;
 629                 ci_irq(ci);
 630                 spin_unlock_irqrestore(&ci->lock, flags);
 631                 if (ci->wq && role != USB_ROLE_NONE)
 632                         flush_workqueue(ci->wq);
 633                 spin_lock_irqsave(&ci->lock, flags);
 634         }
 635
 636         cable = NULL;
 637
 638         /* Start target role */
 639         if (role == USB_ROLE_DEVICE)
 640                 cable = &ci->platdata->vbus_extcon;
 641         else if (role == USB_ROLE_HOST)
 642                 cable = &ci->platdata->id_extcon;
 643
 644         if (cable) {
 645                 cable->changed = true;
 646                 cable->connected = true;
 647                 ci_irq(ci);
 648         }
 649         spin_unlock_irqrestore(&ci->lock, flags);
 650         pm_runtime_put_sync(ci->dev);
 651
 652         return 0;
 653 }
 654
 655 static struct usb_role_switch_desc ci_role_switch = {
 656         .set = ci_usb_role_switch_set,
 657         .get = ci_usb_role_switch_get,
 658         .allow_userspace_control = true,
 659 };
 660
 661 static int ci_get_platdata(struct device *dev,
 662                 struct ci_hdrc_platform_data *platdata)
 663 {
 664         struct extcon_dev *ext_vbus, *ext_id;
 665         struct ci_hdrc_cable *cable;
 666         int ret;
 667
 668         if (!platdata->phy_mode)
 669                 platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
 670
 671         if (!platdata->dr_mode)
 672                 platdata->dr_mode = usb_get_dr_mode(dev);
 673
 674         if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
 675                 platdata->dr_mode = USB_DR_MODE_OTG;
 676
 677         if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
 678                 /* Get the vbus regulator */
 679                 platdata->reg_vbus = devm_regulator_get_optional(dev, "vbus");
 680                 if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
 681                         return -EPROBE_DEFER;
 682                 } else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
 683                         /* no vbus regulator is needed */
 684                         platdata->reg_vbus = NULL;
 685                 } else if (IS_ERR(platdata->reg_vbus)) {
 686                         dev_err(dev, "Getting regulator error: %ld\n",
 687                                 PTR_ERR(platdata->reg_vbus));
 688                         return PTR_ERR(platdata->reg_vbus);
 689                 }
 690                 /* Get TPL support */
 691                 if (!platdata->tpl_support)
 692                         platdata->tpl_support =
 693                                 of_usb_host_tpl_support(dev->of_node);
 694         }
 695
 696         if (platdata->dr_mode == USB_DR_MODE_OTG) {
 697                 /* We can support HNP and SRP of OTG 2.0 */
 698                 platdata->ci_otg_caps.otg_rev = 0x0200;
 699                 platdata->ci_otg_caps.hnp_support = true;
 700                 platdata->ci_otg_caps.srp_support = true;
 701
 702                 /* Update otg capabilities by DT properties */
 703                 ret = of_usb_update_otg_caps(dev->of_node,
 704                                         &platdata->ci_otg_caps);
 705                 if (ret)
 706                         return ret;
 707         }
 708
 709         if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
 710                 platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
 711
 712         of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
 713                                      &platdata->phy_clkgate_delay_us);
 714
 715         platdata->itc_setting = 1;
 716
 717         of_property_read_u32(dev->of_node, "itc-setting",
 718                                         &platdata->itc_setting);
 719
 720         ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
 721                                 &platdata->ahb_burst_config);
 722         if (!ret) {
 723                 platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
 724         } else if (ret != -EINVAL) {
 725                 dev_err(dev, "failed to get ahb-burst-config\n");
 726                 return ret;
 727         }
 728
 729         ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
 730                                 &platdata->tx_burst_size);
 731         if (!ret) {
 732                 platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
 733         } else if (ret != -EINVAL) {
 734                 dev_err(dev, "failed to get tx-burst-size-dword\n");
 735                 return ret;
 736         }
 737
 738         ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
 739                                 &platdata->rx_burst_size);
 740         if (!ret) {
 741                 platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
 742         } else if (ret != -EINVAL) {
 743                 dev_err(dev, "failed to get rx-burst-size-dword\n");
 744                 return ret;
 745         }
 746
 747         if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL))
 748                 platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
 749
 750         ext_id = ERR_PTR(-ENODEV);
 751         ext_vbus = ERR_PTR(-ENODEV);
 752         if (of_property_read_bool(dev->of_node, "extcon")) {
 753                 /* Each one of them is not mandatory */
 754                 ext_vbus = extcon_get_edev_by_phandle(dev, 0);
 755                 if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
 756                         return PTR_ERR(ext_vbus);
 757
 758                 ext_id = extcon_get_edev_by_phandle(dev, 1);
 759                 if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
 760                         return PTR_ERR(ext_id);
 761         }
 762
 763         cable = &platdata->vbus_extcon;
 764         cable->nb.notifier_call = ci_cable_notifier;
 765         cable->edev = ext_vbus;
 766
 767         if (!IS_ERR(ext_vbus)) {
 768                 ret = extcon_get_state(cable->edev, EXTCON_USB);
 769                 if (ret)
 770                         cable->connected = true;
 771                 else
 772                         cable->connected = false;
 773         }
 774
 775         cable = &platdata->id_extcon;
 776         cable->nb.notifier_call = ci_cable_notifier;
 777         cable->edev = ext_id;
 778
 779         if (!IS_ERR(ext_id)) {
 780                 ret = extcon_get_state(cable->edev, EXTCON_USB_HOST);
 781                 if (ret)
 782                         cable->connected = true;
 783                 else
 784                         cable->connected = false;
 785         }
 786
 787         if (device_property_read_bool(dev, "usb-role-switch"))
 788                 ci_role_switch.fwnode = dev->fwnode;
 789
 790         platdata->pctl = devm_pinctrl_get(dev);
 791         if (!IS_ERR(platdata->pctl)) {
 792                 struct pinctrl_state *p;
 793
 794                 p = pinctrl_lookup_state(platdata->pctl, "default");
 795                 if (!IS_ERR(p))
 796                         platdata->pins_default = p;
 797
 798                 p = pinctrl_lookup_state(platdata->pctl, "host");
 799                 if (!IS_ERR(p))
 800                         platdata->pins_host = p;
 801
 802                 p = pinctrl_lookup_state(platdata->pctl, "device");
 803                 if (!IS_ERR(p))
 804                         platdata->pins_device = p;
 805         }
 806
 807         if (!platdata->enter_lpm)
 808                 platdata->enter_lpm = ci_hdrc_enter_lpm_common;
 809
 810         return 0;
 811 }
 812
 813 static int ci_extcon_register(struct ci_hdrc *ci)
 814 {
 815         struct ci_hdrc_cable *id, *vbus;
 816         int ret;
 817
 818         id = &ci->platdata->id_extcon;
 819         id->ci = ci;
 820         if (!IS_ERR_OR_NULL(id->edev)) {
 821                 ret = devm_extcon_register_notifier(ci->dev, id->edev,
 822                                                 EXTCON_USB_HOST, &id->nb);
 823                 if (ret < 0) {
 824                         dev_err(ci->dev, "register ID failed\n");
 825                         return ret;
 826                 }
 827         }
 828
 829         vbus = &ci->platdata->vbus_extcon;
 830         vbus->ci = ci;
 831         if (!IS_ERR_OR_NULL(vbus->edev)) {
 832                 ret = devm_extcon_register_notifier(ci->dev, vbus->edev,
 833                                                 EXTCON_USB, &vbus->nb);
 834                 if (ret < 0) {
 835                         dev_err(ci->dev, "register VBUS failed\n");
 836                         return ret;
 837                 }
 838         }
 839
 840         return 0;
 841 }
 842
 843 static DEFINE_IDA(ci_ida);
 844
 845 struct platform_device *ci_hdrc_add_device(struct device *dev,
 846                         struct resource *res, int nres,
 847                         struct ci_hdrc_platform_data *platdata)
 848 {
 849         struct platform_device *pdev;
 850         int id, ret;
 851
 852         ret = ci_get_platdata(dev, platdata);
 853         if (ret)
 854                 return ERR_PTR(ret);
 855
 856         id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
 857         if (id < 0)
 858                 return ERR_PTR(id);
 859
 860         pdev = platform_device_alloc("ci_hdrc", id);
 861         if (!pdev) {
 862                 ret = -ENOMEM;
 863                 goto put_id;
 864         }
 865
 866         pdev->dev.parent = dev;
 867         device_set_of_node_from_dev(&pdev->dev, dev);
 868
 869         ret = platform_device_add_resources(pdev, res, nres);
 870         if (ret)
 871                 goto err;
 872
 873         ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
 874         if (ret)
 875                 goto err;
 876
 877         ret = platform_device_add(pdev);
 878         if (ret)
 879                 goto err;
 880
 881         return pdev;
 882
 883 err:
 884         platform_device_put(pdev);
 885 put_id:
 886         ida_simple_remove(&ci_ida, id);
 887         return ERR_PTR(ret);
 888 }
 889 EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
 890
 891 void ci_hdrc_remove_device(struct platform_device *pdev)
 892 {
 893         int id = pdev->id;
 894         platform_device_unregister(pdev);
 895         ida_simple_remove(&ci_ida, id);
 896 }
 897 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
 898
 899 /**
 900  * ci_hdrc_query_available_role: get runtime available operation mode
 901  *
 902  * The glue layer can get current operation mode (host/peripheral/otg)
 903  * This function should be called after ci core device has created.
 904  *
 905  * @pdev: the platform device of ci core.
 906  *
 907  * Return runtime usb_dr_mode.
 908  */
 909 enum usb_dr_mode ci_hdrc_query_available_role(struct platform_device *pdev)
 910 {
 911         struct ci_hdrc *ci = platform_get_drvdata(pdev);
 912
 913         if (!ci)
 914                 return USB_DR_MODE_UNKNOWN;
 915         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])
 916                 return USB_DR_MODE_OTG;
 917         else if (ci->roles[CI_ROLE_HOST])
 918                 return USB_DR_MODE_HOST;
 919         else if (ci->roles[CI_ROLE_GADGET])
 920                 return USB_DR_MODE_PERIPHERAL;
 921         else
 922                 return USB_DR_MODE_UNKNOWN;
 923 }
 924 EXPORT_SYMBOL_GPL(ci_hdrc_query_available_role);
 925
 926 static inline void ci_role_destroy(struct ci_hdrc *ci)
 927 {
 928         ci_hdrc_gadget_destroy(ci);
 929         ci_hdrc_host_destroy(ci);
 930         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
 931                 ci_hdrc_otg_destroy(ci);
 932 }
 933
 934 static void ci_get_otg_capable(struct ci_hdrc *ci)
 935 {
 936         if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
 937                 ci->is_otg = false;
 938         else
 939                 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
 940                                 DCCPARAMS_DC | DCCPARAMS_HC)
 941                                         == (DCCPARAMS_DC | DCCPARAMS_HC));
 942         if (ci->is_otg) {
 943                 dev_dbg(ci->dev, "It is OTG capable controller\n");
 944                 /* Disable and clear all OTG irq */
 945                 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
 946                                                         OTGSC_INT_STATUS_BITS);
 947         }
 948 }
 949
 950 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
 951                           char *buf)
 952 {
 953         struct ci_hdrc *ci = dev_get_drvdata(dev);
 954
 955         if (ci->role != CI_ROLE_END)
 956                 return sprintf(buf, "%s\n", ci_role(ci)->name);
 957
 958         return 0;
 959 }
 960
 961 static ssize_t role_store(struct device *dev,
 962                 struct device_attribute *attr, const char *buf, size_t n)
 963 {
 964         struct ci_hdrc *ci = dev_get_drvdata(dev);
 965         enum ci_role role;
 966         int ret;
 967
 968         if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
 969                 dev_warn(dev, "Current configuration is not dual-role, quit\n");
 970                 return -EPERM;
 971         }
 972
 973         for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
 974                 if (!strncmp(buf, ci->roles[role]->name,
 975                              strlen(ci->roles[role]->name)))
 976                         break;
 977
 978         if (role == CI_ROLE_END || role == ci->role)
 979                 return -EINVAL;
 980
 981         pm_runtime_get_sync(dev);
 982         disable_irq(ci->irq);
 983         ci_role_stop(ci);
 984         ret = ci_role_start(ci, role);
 985         if (!ret && ci->role == CI_ROLE_GADGET)
 986                 ci_handle_vbus_change(ci);
 987         enable_irq(ci->irq);
 988         pm_runtime_put_sync(dev);
 989
 990         return (ret == 0) ? n : ret;
 991 }
 992 static DEVICE_ATTR_RW(role);
 993
 994 static struct attribute *ci_attrs[] = {
 995         &dev_attr_role.attr,
 996         NULL,
 997 };
 998 ATTRIBUTE_GROUPS(ci);
 999
1000 static int ci_hdrc_probe(struct platform_device *pdev)
1001 {
1002         struct device   *dev = &pdev->dev;
1003         struct ci_hdrc  *ci;
1004         struct resource *res;
1005         void __iomem    *base;
1006         int             ret;
1007         enum usb_dr_mode dr_mode;
1008
1009         if (!dev_get_platdata(dev)) {
1010                 dev_err(dev, "platform data missing\n");
1011                 return -ENODEV;
1012         }
1013
1014         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1015         base = devm_ioremap_resource(dev, res);
1016         if (IS_ERR(base))
1017                 return PTR_ERR(base);
1018
1019         ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
1020         if (!ci)
1021                 return -ENOMEM;
1022
1023         spin_lock_init(&ci->lock);
1024         ci->dev = dev;
1025         ci->platdata = dev_get_platdata(dev);
1026         ci->imx28_write_fix = !!(ci->platdata->flags &
1027                 CI_HDRC_IMX28_WRITE_FIX);
1028         ci->supports_runtime_pm = !!(ci->platdata->flags &
1029                 CI_HDRC_SUPPORTS_RUNTIME_PM);
1030         platform_set_drvdata(pdev, ci);
1031
1032         ret = hw_device_init(ci, base);
1033         if (ret < 0) {
1034                 dev_err(dev, "can't initialize hardware\n");
1035                 return -ENODEV;
1036         }
1037
1038         ret = ci_ulpi_init(ci);
1039         if (ret)
1040                 return ret;
1041
1042         if (ci->platdata->phy) {
1043                 ci->phy = ci->platdata->phy;
1044         } else if (ci->platdata->usb_phy) {
1045                 ci->usb_phy = ci->platdata->usb_phy;
1046         } else {
1047                 /* Look for a generic PHY first */
1048                 ci->phy = devm_phy_get(dev->parent, "usb-phy");
1049
1050                 if (PTR_ERR(ci->phy) == -EPROBE_DEFER) {
1051                         ret = -EPROBE_DEFER;
1052                         goto ulpi_exit;
1053                 } else if (IS_ERR(ci->phy)) {
1054                         ci->phy = NULL;
1055                 }
1056
1057                 /* Look for a legacy USB PHY from device-tree next */
1058                 if (!ci->phy) {
1059                         ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent,
1060                                                                   "phys", 0);
1061
1062                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1063                                 ret = -EPROBE_DEFER;
1064                                 goto ulpi_exit;
1065                         } else if (IS_ERR(ci->usb_phy)) {
1066                                 ci->usb_phy = NULL;
1067                         }
1068                 }
1069
1070                 /* Look for any registered legacy USB PHY as last resort */
1071                 if (!ci->phy && !ci->usb_phy) {
1072                         ci->usb_phy = devm_usb_get_phy(dev->parent,
1073                                                        USB_PHY_TYPE_USB2);
1074
1075                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1076                                 ret = -EPROBE_DEFER;
1077                                 goto ulpi_exit;
1078                         } else if (IS_ERR(ci->usb_phy)) {
1079                                 ci->usb_phy = NULL;
1080                         }
1081                 }
1082
1083                 /* No USB PHY was found in the end */
1084                 if (!ci->phy && !ci->usb_phy) {
1085                         ret = -ENXIO;
1086                         goto ulpi_exit;
1087                 }
1088         }
1089
1090         ret = ci_usb_phy_init(ci);
1091         if (ret) {
1092                 dev_err(dev, "unable to init phy: %d\n", ret);
1093                 return ret;
1094         }
1095
1096         ci->hw_bank.phys = res->start;
1097
1098         ci->irq = platform_get_irq(pdev, 0);
1099         if (ci->irq < 0) {
1100                 ret = ci->irq;
1101                 goto deinit_phy;
1102         }
1103
1104         ci_get_otg_capable(ci);
1105
1106         dr_mode = ci->platdata->dr_mode;
1107         /* initialize role(s) before the interrupt is requested */
1108         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
1109                 ret = ci_hdrc_host_init(ci);
1110                 if (ret) {
1111                         if (ret == -ENXIO)
1112                                 dev_info(dev, "doesn't support host\n");
1113                         else
1114                                 goto deinit_phy;
1115                 }
1116         }
1117
1118         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
1119                 ret = ci_hdrc_gadget_init(ci);
1120                 if (ret) {
1121                         if (ret == -ENXIO)
1122                                 dev_info(dev, "doesn't support gadget\n");
1123                         else
1124                                 goto deinit_host;
1125                 }
1126         }
1127
1128         if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
1129                 dev_err(dev, "no supported roles\n");
1130                 ret = -ENODEV;
1131                 goto deinit_gadget;
1132         }
1133
1134         if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
1135                 ret = ci_hdrc_otg_init(ci);
1136                 if (ret) {
1137                         dev_err(dev, "init otg fails, ret = %d\n", ret);
1138                         goto deinit_gadget;
1139                 }
1140         }
1141
1142         if (ci_role_switch.fwnode) {
1143                 ci_role_switch.driver_data = ci;
1144                 ci->role_switch = usb_role_switch_register(dev,
1145                                         &ci_role_switch);
1146                 if (IS_ERR(ci->role_switch)) {
1147                         ret = PTR_ERR(ci->role_switch);
1148                         goto deinit_otg;
1149                 }
1150         }
1151
1152         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
1153                 if (ci->is_otg) {
1154                         ci->role = ci_otg_role(ci);
1155                         /* Enable ID change irq */
1156                         hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
1157                 } else {
1158                         /*
1159                          * If the controller is not OTG capable, but support
1160                          * role switch, the defalt role is gadget, and the
1161                          * user can switch it through debugfs.
1162                          */
1163                         ci->role = CI_ROLE_GADGET;
1164                 }
1165         } else {
1166                 ci->role = ci->roles[CI_ROLE_HOST]
1167                         ? CI_ROLE_HOST
1168                         : CI_ROLE_GADGET;
1169         }
1170
1171         if (!ci_otg_is_fsm_mode(ci)) {
1172                 /* only update vbus status for peripheral */
1173                 if (ci->role == CI_ROLE_GADGET) {
1174                         /* Pull down DP for possible charger detection */
1175                         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1176                         ci_handle_vbus_change(ci);
1177                 }
1178
1179                 ret = ci_role_start(ci, ci->role);
1180                 if (ret) {
1181                         dev_err(dev, "can't start %s role\n",
1182                                                 ci_role(ci)->name);
1183                         goto stop;
1184                 }
1185         }
1186
1187         ret = devm_request_irq(dev, ci->irq, ci_irq_handler, IRQF_SHARED,
1188                         ci->platdata->name, ci);
1189         if (ret)
1190                 goto stop;
1191
1192         ret = ci_extcon_register(ci);
1193         if (ret)
1194                 goto stop;
1195
1196         if (ci->supports_runtime_pm) {
1197                 pm_runtime_set_active(&pdev->dev);
1198                 pm_runtime_enable(&pdev->dev);
1199                 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
1200                 pm_runtime_mark_last_busy(ci->dev);
1201                 pm_runtime_use_autosuspend(&pdev->dev);
1202         }
1203
1204         if (ci_otg_is_fsm_mode(ci))
1205                 ci_hdrc_otg_fsm_start(ci);
1206
1207         device_set_wakeup_capable(&pdev->dev, true);
1208         dbg_create_files(ci);
1209
1210         return 0;
1211
1212 stop:
1213         if (ci->role_switch)
1214                 usb_role_switch_unregister(ci->role_switch);
1215 deinit_otg:
1216         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
1217                 ci_hdrc_otg_destroy(ci);
1218 deinit_gadget:
1219         ci_hdrc_gadget_destroy(ci);
1220 deinit_host:
1221         ci_hdrc_host_destroy(ci);
1222 deinit_phy:
1223         ci_usb_phy_exit(ci);
1224 ulpi_exit:
1225         ci_ulpi_exit(ci);
1226
1227         return ret;
1228 }
1229
1230 static int ci_hdrc_remove(struct platform_device *pdev)
1231 {
1232         struct ci_hdrc *ci = platform_get_drvdata(pdev);
1233
1234         if (ci->role_switch)
1235                 usb_role_switch_unregister(ci->role_switch);
1236
1237         if (ci->supports_runtime_pm) {
1238                 pm_runtime_get_sync(&pdev->dev);
1239                 pm_runtime_disable(&pdev->dev);
1240                 pm_runtime_put_noidle(&pdev->dev);
1241         }
1242
1243         dbg_remove_files(ci);
1244         ci_role_destroy(ci);
1245         ci_hdrc_enter_lpm(ci, true);
1246         ci_usb_phy_exit(ci);
1247         ci_ulpi_exit(ci);
1248
1249         return 0;
1250 }
1251
1252 #ifdef CONFIG_PM
1253 /* Prepare wakeup by SRP before suspend */
1254 static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
1255 {
1256         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1257                                 !hw_read_otgsc(ci, OTGSC_ID)) {
1258                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
1259                                                                 PORTSC_PP);
1260                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
1261                                                                 PORTSC_WKCN);
1262         }
1263 }
1264
1265 /* Handle SRP when wakeup by data pulse */
1266 static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
1267 {
1268         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1269                 (ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
1270                 if (!hw_read_otgsc(ci, OTGSC_ID)) {
1271                         ci->fsm.a_srp_det = 1;
1272                         ci->fsm.a_bus_drop = 0;
1273                 } else {
1274                         ci->fsm.id = 1;
1275                 }
1276                 ci_otg_queue_work(ci);
1277         }
1278 }
1279
1280 static void ci_controller_suspend(struct ci_hdrc *ci)
1281 {
1282         disable_irq(ci->irq);
1283         ci_hdrc_enter_lpm(ci, true);
1284         if (ci->platdata->phy_clkgate_delay_us)
1285                 usleep_range(ci->platdata->phy_clkgate_delay_us,
1286                              ci->platdata->phy_clkgate_delay_us + 50);
1287         usb_phy_set_suspend(ci->usb_phy, 1);
1288         ci->in_lpm = true;
1289         enable_irq(ci->irq);
1290 }
1291
1292 /*
1293  * Handle the wakeup interrupt triggered by extcon connector
1294  * We need to call ci_irq again for extcon since the first
1295  * interrupt (wakeup int) only let the controller be out of
1296  * low power mode, but not handle any interrupts.
1297  */
1298 static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
1299 {
1300         struct ci_hdrc_cable *cable_id, *cable_vbus;
1301         u32 otgsc = hw_read_otgsc(ci, ~0);
1302
1303         cable_id = &ci->platdata->id_extcon;
1304         cable_vbus = &ci->platdata->vbus_extcon;
1305
1306         if (!IS_ERR(cable_id->edev) && ci->is_otg &&
1307                 (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS))
1308                 ci_irq(ci);
1309
1310         if (!IS_ERR(cable_vbus->edev) && ci->is_otg &&
1311                 (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS))
1312                 ci_irq(ci);
1313 }
1314
1315 static int ci_controller_resume(struct device *dev)
1316 {
1317         struct ci_hdrc *ci = dev_get_drvdata(dev);
1318         int ret;
1319
1320         dev_dbg(dev, "at %s\n", __func__);
1321
1322         if (!ci->in_lpm) {
1323                 WARN_ON(1);
1324                 return 0;
1325         }
1326
1327         ci_hdrc_enter_lpm(ci, false);
1328
1329         ret = ci_ulpi_resume(ci);
1330         if (ret)
1331                 return ret;
1332
1333         if (ci->usb_phy) {
1334                 usb_phy_set_suspend(ci->usb_phy, 0);
1335                 usb_phy_set_wakeup(ci->usb_phy, false);
1336                 hw_wait_phy_stable();
1337         }
1338
1339         ci->in_lpm = false;
1340         if (ci->wakeup_int) {
1341                 ci->wakeup_int = false;
1342                 pm_runtime_mark_last_busy(ci->dev);
1343                 pm_runtime_put_autosuspend(ci->dev);
1344                 enable_irq(ci->irq);
1345                 if (ci_otg_is_fsm_mode(ci))
1346                         ci_otg_fsm_wakeup_by_srp(ci);
1347                 ci_extcon_wakeup_int(ci);
1348         }
1349
1350         return 0;
1351 }
1352
1353 #ifdef CONFIG_PM_SLEEP
1354 static int ci_suspend(struct device *dev)
1355 {
1356         struct ci_hdrc *ci = dev_get_drvdata(dev);
1357
1358         if (ci->wq)
1359                 flush_workqueue(ci->wq);
1360         /*
1361          * Controller needs to be active during suspend, otherwise the core
1362          * may run resume when the parent is at suspend if other driver's
1363          * suspend fails, it occurs before parent's suspend has not started,
1364          * but the core suspend has finished.
1365          */
1366         if (ci->in_lpm)
1367                 pm_runtime_resume(dev);
1368
1369         if (ci->in_lpm) {
1370                 WARN_ON(1);
1371                 return 0;
1372         }
1373
1374         if (device_may_wakeup(dev)) {
1375                 if (ci_otg_is_fsm_mode(ci))
1376                         ci_otg_fsm_suspend_for_srp(ci);
1377
1378                 usb_phy_set_wakeup(ci->usb_phy, true);
1379                 enable_irq_wake(ci->irq);
1380         }
1381
1382         ci_controller_suspend(ci);
1383
1384         return 0;
1385 }
1386
1387 static int ci_resume(struct device *dev)
1388 {
1389         struct ci_hdrc *ci = dev_get_drvdata(dev);
1390         int ret;
1391
1392         if (device_may_wakeup(dev))
1393                 disable_irq_wake(ci->irq);
1394
1395         ret = ci_controller_resume(dev);
1396         if (ret)
1397                 return ret;
1398
1399         if (ci->supports_runtime_pm) {
1400                 pm_runtime_disable(dev);
1401                 pm_runtime_set_active(dev);
1402                 pm_runtime_enable(dev);
1403         }
1404
1405         return ret;
1406 }
1407 #endif /* CONFIG_PM_SLEEP */
1408
1409 static int ci_runtime_suspend(struct device *dev)
1410 {
1411         struct ci_hdrc *ci = dev_get_drvdata(dev);
1412
1413         dev_dbg(dev, "at %s\n", __func__);
1414
1415         if (ci->in_lpm) {
1416                 WARN_ON(1);
1417                 return 0;
1418         }
1419
1420         if (ci_otg_is_fsm_mode(ci))
1421                 ci_otg_fsm_suspend_for_srp(ci);
1422
1423         usb_phy_set_wakeup(ci->usb_phy, true);
1424         ci_controller_suspend(ci);
1425
1426         return 0;
1427 }
1428
1429 static int ci_runtime_resume(struct device *dev)
1430 {
1431         return ci_controller_resume(dev);
1432 }
1433
1434 #endif /* CONFIG_PM */
1435 static const struct dev_pm_ops ci_pm_ops = {
1436         SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
1437         SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
1438 };
1439
1440 static struct platform_driver ci_hdrc_driver = {
1441         .probe  = ci_hdrc_probe,
1442         .remove = ci_hdrc_remove,
1443         .driver = {
1444                 .name   = "ci_hdrc",
1445                 .pm     = &ci_pm_ops,
1446                 .dev_groups = ci_groups,
1447         },
1448 };
1449
1450 static int __init ci_hdrc_platform_register(void)
1451 {
1452         ci_hdrc_host_driver_init();
1453         return platform_driver_register(&ci_hdrc_driver);
1454 }
1455 module_init(ci_hdrc_platform_register);
1456
1457 static void __exit ci_hdrc_platform_unregister(void)
1458 {
1459         platform_driver_unregister(&ci_hdrc_driver);
1460 }
1461 module_exit(ci_hdrc_platform_unregister);
1462
1463 MODULE_ALIAS("platform:ci_hdrc");
1464 MODULE_LICENSE("GPL v2");
1465 MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
1466 MODULE_DESCRIPTION("ChipIdea HDRC Driver");