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(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 int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
 212 {
 213         u32 reg;
 214
 215         /* bank is a module variable */
 216         ci->hw_bank.abs = base;
 217
 218         ci->hw_bank.cap = ci->hw_bank.abs;
 219         ci->hw_bank.cap += ci->platdata->capoffset;
 220         ci->hw_bank.op = ci->hw_bank.cap + (ioread32(ci->hw_bank.cap) & 0xff);
 221
 222         hw_alloc_regmap(ci, false);
 223         reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
 224                 __ffs(HCCPARAMS_LEN);
 225         ci->hw_bank.lpm  = reg;
 226         if (reg)
 227                 hw_alloc_regmap(ci, !!reg);
 228         ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
 229         ci->hw_bank.size += OP_LAST;
 230         ci->hw_bank.size /= sizeof(u32);
 231
 232         reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
 233                 __ffs(DCCPARAMS_DEN);
 234         ci->hw_ep_max = reg * 2;   /* cache hw ENDPT_MAX */
 235
 236         if (ci->hw_ep_max > ENDPT_MAX)
 237                 return -ENODEV;
 238
 239         ci_hdrc_enter_lpm(ci, false);
 240
 241         /* Disable all interrupts bits */
 242         hw_write(ci, OP_USBINTR, 0xffffffff, 0);
 243
 244         /* Clear all interrupts status bits*/
 245         hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
 246
 247         ci->rev = ci_get_revision(ci);
 248
 249         dev_dbg(ci->dev,
 250                 "revision: %d, lpm: %d; cap: %px op: %px\n",
 251                 ci->rev, ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
 252
 253         /* setup lock mode ? */
 254
 255         /* ENDPTSETUPSTAT is '0' by default */
 256
 257         /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
 258
 259         return 0;
 260 }
 261
 262 void hw_phymode_configure(struct ci_hdrc *ci)
 263 {
 264         u32 portsc, lpm, sts = 0;
 265
 266         switch (ci->platdata->phy_mode) {
 267         case USBPHY_INTERFACE_MODE_UTMI:
 268                 portsc = PORTSC_PTS(PTS_UTMI);
 269                 lpm = DEVLC_PTS(PTS_UTMI);
 270                 break;
 271         case USBPHY_INTERFACE_MODE_UTMIW:
 272                 portsc = PORTSC_PTS(PTS_UTMI) | PORTSC_PTW;
 273                 lpm = DEVLC_PTS(PTS_UTMI) | DEVLC_PTW;
 274                 break;
 275         case USBPHY_INTERFACE_MODE_ULPI:
 276                 portsc = PORTSC_PTS(PTS_ULPI);
 277                 lpm = DEVLC_PTS(PTS_ULPI);
 278                 break;
 279         case USBPHY_INTERFACE_MODE_SERIAL:
 280                 portsc = PORTSC_PTS(PTS_SERIAL);
 281                 lpm = DEVLC_PTS(PTS_SERIAL);
 282                 sts = 1;
 283                 break;
 284         case USBPHY_INTERFACE_MODE_HSIC:
 285                 portsc = PORTSC_PTS(PTS_HSIC);
 286                 lpm = DEVLC_PTS(PTS_HSIC);
 287                 break;
 288         default:
 289                 return;
 290         }
 291
 292         if (ci->hw_bank.lpm) {
 293                 hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
 294                 if (sts)
 295                         hw_write(ci, OP_DEVLC, DEVLC_STS, DEVLC_STS);
 296         } else {
 297                 hw_write(ci, OP_PORTSC, PORTSC_PTS(7) | PORTSC_PTW, portsc);
 298                 if (sts)
 299                         hw_write(ci, OP_PORTSC, PORTSC_STS, PORTSC_STS);
 300         }
 301 }
 302 EXPORT_SYMBOL_GPL(hw_phymode_configure);
 303
 304 /**
 305  * _ci_usb_phy_init: initialize phy taking in account both phy and usb_phy
 306  * interfaces
 307  * @ci: the controller
 308  *
 309  * This function returns an error code if the phy failed to init
 310  */
 311 static int _ci_usb_phy_init(struct ci_hdrc *ci)
 312 {
 313         int ret;
 314
 315         if (ci->phy) {
 316                 ret = phy_init(ci->phy);
 317                 if (ret)
 318                         return ret;
 319
 320                 ret = phy_power_on(ci->phy);
 321                 if (ret) {
 322                         phy_exit(ci->phy);
 323                         return ret;
 324                 }
 325         } else {
 326                 ret = usb_phy_init(ci->usb_phy);
 327         }
 328
 329         return ret;
 330 }
 331
 332 /**
 333  * _ci_usb_phy_exit: deinitialize phy taking in account both phy and usb_phy
 334  * interfaces
 335  * @ci: the controller
 336  */
 337 static void ci_usb_phy_exit(struct ci_hdrc *ci)
 338 {
 339         if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
 340                 return;
 341
 342         if (ci->phy) {
 343                 phy_power_off(ci->phy);
 344                 phy_exit(ci->phy);
 345         } else {
 346                 usb_phy_shutdown(ci->usb_phy);
 347         }
 348 }
 349
 350 /**
 351  * ci_usb_phy_init: initialize phy according to different phy type
 352  * @ci: the controller
 353  *
 354  * This function returns an error code if usb_phy_init has failed
 355  */
 356 static int ci_usb_phy_init(struct ci_hdrc *ci)
 357 {
 358         int ret;
 359
 360         if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
 361                 return 0;
 362
 363         switch (ci->platdata->phy_mode) {
 364         case USBPHY_INTERFACE_MODE_UTMI:
 365         case USBPHY_INTERFACE_MODE_UTMIW:
 366         case USBPHY_INTERFACE_MODE_HSIC:
 367                 ret = _ci_usb_phy_init(ci);
 368                 if (!ret)
 369                         hw_wait_phy_stable();
 370                 else
 371                         return ret;
 372                 hw_phymode_configure(ci);
 373                 break;
 374         case USBPHY_INTERFACE_MODE_ULPI:
 375         case USBPHY_INTERFACE_MODE_SERIAL:
 376                 hw_phymode_configure(ci);
 377                 ret = _ci_usb_phy_init(ci);
 378                 if (ret)
 379                         return ret;
 380                 break;
 381         default:
 382                 ret = _ci_usb_phy_init(ci);
 383                 if (!ret)
 384                         hw_wait_phy_stable();
 385         }
 386
 387         return ret;
 388 }
 389
 390
 391 /**
 392  * ci_platform_configure: do controller configure
 393  * @ci: the controller
 394  *
 395  */
 396 void ci_platform_configure(struct ci_hdrc *ci)
 397 {
 398         bool is_device_mode, is_host_mode;
 399
 400         is_device_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_DC;
 401         is_host_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_HC;
 402
 403         if (is_device_mode) {
 404                 phy_set_mode(ci->phy, PHY_MODE_USB_DEVICE);
 405
 406                 if (ci->platdata->flags & CI_HDRC_DISABLE_DEVICE_STREAMING)
 407                         hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
 408                                  USBMODE_CI_SDIS);
 409         }
 410
 411         if (is_host_mode) {
 412                 phy_set_mode(ci->phy, PHY_MODE_USB_HOST);
 413
 414                 if (ci->platdata->flags & CI_HDRC_DISABLE_HOST_STREAMING)
 415                         hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
 416                                  USBMODE_CI_SDIS);
 417         }
 418
 419         if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) {
 420                 if (ci->hw_bank.lpm)
 421                         hw_write(ci, OP_DEVLC, DEVLC_PFSC, DEVLC_PFSC);
 422                 else
 423                         hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
 424         }
 425
 426         if (ci->platdata->flags & CI_HDRC_SET_NON_ZERO_TTHA)
 427                 hw_write(ci, OP_TTCTRL, TTCTRL_TTHA_MASK, TTCTRL_TTHA);
 428
 429         hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
 430
 431         if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
 432                 hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
 433                         ci->platdata->ahb_burst_config);
 434
 435         /* override burst size, take effect only when ahb_burst_config is 0 */
 436         if (!hw_read_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK)) {
 437                 if (ci->platdata->flags & CI_HDRC_OVERRIDE_TX_BURST)
 438                         hw_write(ci, OP_BURSTSIZE, TX_BURST_MASK,
 439                         ci->platdata->tx_burst_size << __ffs(TX_BURST_MASK));
 440
 441                 if (ci->platdata->flags & CI_HDRC_OVERRIDE_RX_BURST)
 442                         hw_write(ci, OP_BURSTSIZE, RX_BURST_MASK,
 443                                 ci->platdata->rx_burst_size);
 444         }
 445 }
 446
 447 /**
 448  * hw_controller_reset: do controller reset
 449  * @ci: the controller
 450   *
 451  * This function returns an error code
 452  */
 453 static int hw_controller_reset(struct ci_hdrc *ci)
 454 {
 455         int count = 0;
 456
 457         hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
 458         while (hw_read(ci, OP_USBCMD, USBCMD_RST)) {
 459                 udelay(10);
 460                 if (count++ > 1000)
 461                         return -ETIMEDOUT;
 462         }
 463
 464         return 0;
 465 }
 466
 467 /**
 468  * hw_device_reset: resets chip (execute without interruption)
 469  * @ci: the controller
 470  *
 471  * This function returns an error code
 472  */
 473 int hw_device_reset(struct ci_hdrc *ci)
 474 {
 475         int ret;
 476
 477         /* should flush & stop before reset */
 478         hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
 479         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
 480
 481         ret = hw_controller_reset(ci);
 482         if (ret) {
 483                 dev_err(ci->dev, "error resetting controller, ret=%d\n", ret);
 484                 return ret;
 485         }
 486
 487         if (ci->platdata->notify_event) {
 488                 ret = ci->platdata->notify_event(ci,
 489                         CI_HDRC_CONTROLLER_RESET_EVENT);
 490                 if (ret)
 491                         return ret;
 492         }
 493
 494         /* USBMODE should be configured step by step */
 495         hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
 496         hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_DC);
 497         /* HW >= 2.3 */
 498         hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
 499
 500         if (hw_read(ci, OP_USBMODE, USBMODE_CM) != USBMODE_CM_DC) {
 501                 dev_err(ci->dev, "cannot enter in %s device mode\n",
 502                         ci_role(ci)->name);
 503                 dev_err(ci->dev, "lpm = %i\n", ci->hw_bank.lpm);
 504                 return -ENODEV;
 505         }
 506
 507         ci_platform_configure(ci);
 508
 509         return 0;
 510 }
 511
 512 static irqreturn_t ci_irq_handler(int irq, void *data)
 513 {
 514         struct ci_hdrc *ci = data;
 515         irqreturn_t ret = IRQ_NONE;
 516         u32 otgsc = 0;
 517
 518         if (ci->in_lpm) {
 519                 /*
 520                  * If we already have a wakeup irq pending there,
 521                  * let's just return to wait resume finished firstly.
 522                  */
 523                 if (ci->wakeup_int)
 524                         return IRQ_HANDLED;
 525
 526                 disable_irq_nosync(irq);
 527                 ci->wakeup_int = true;
 528                 pm_runtime_get(ci->dev);
 529                 return IRQ_HANDLED;
 530         }
 531
 532         if (ci->is_otg) {
 533                 otgsc = hw_read_otgsc(ci, ~0);
 534                 if (ci_otg_is_fsm_mode(ci)) {
 535                         ret = ci_otg_fsm_irq(ci);
 536                         if (ret == IRQ_HANDLED)
 537                                 return ret;
 538                 }
 539         }
 540
 541         /*
 542          * Handle id change interrupt, it indicates device/host function
 543          * switch.
 544          */
 545         if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
 546                 ci->id_event = true;
 547                 /* Clear ID change irq status */
 548                 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
 549                 ci_otg_queue_work(ci);
 550                 return IRQ_HANDLED;
 551         }
 552
 553         /*
 554          * Handle vbus change interrupt, it indicates device connection
 555          * and disconnection events.
 556          */
 557         if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
 558                 ci->b_sess_valid_event = true;
 559                 /* Clear BSV irq */
 560                 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
 561                 ci_otg_queue_work(ci);
 562                 return IRQ_HANDLED;
 563         }
 564
 565         /* Handle device/host interrupt */
 566         if (ci->role != CI_ROLE_END)
 567                 ret = ci_role(ci)->irq(ci);
 568
 569         return ret;
 570 }
 571
 572 static void ci_irq(struct ci_hdrc *ci)
 573 {
 574         unsigned long flags;
 575
 576         local_irq_save(flags);
 577         ci_irq_handler(ci->irq, ci);
 578         local_irq_restore(flags);
 579 }
 580
 581 static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
 582                              void *ptr)
 583 {
 584         struct ci_hdrc_cable *cbl = container_of(nb, struct ci_hdrc_cable, nb);
 585         struct ci_hdrc *ci = cbl->ci;
 586
 587         cbl->connected = event;
 588         cbl->changed = true;
 589
 590         ci_irq(ci);
 591         return NOTIFY_DONE;
 592 }
 593
 594 static enum usb_role ci_usb_role_switch_get(struct usb_role_switch *sw)
 595 {
 596         struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
 597         enum usb_role role;
 598         unsigned long flags;
 599
 600         spin_lock_irqsave(&ci->lock, flags);
 601         role = ci_role_to_usb_role(ci);
 602         spin_unlock_irqrestore(&ci->lock, flags);
 603
 604         return role;
 605 }
 606
 607 static int ci_usb_role_switch_set(struct usb_role_switch *sw,
 608                                   enum usb_role role)
 609 {
 610         struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
 611         struct ci_hdrc_cable *cable = NULL;
 612         enum usb_role current_role = ci_role_to_usb_role(ci);
 613         enum ci_role ci_role = usb_role_to_ci_role(role);
 614         unsigned long flags;
 615
 616         if ((ci_role != CI_ROLE_END && !ci->roles[ci_role]) ||
 617             (current_role == role))
 618                 return 0;
 619
 620         pm_runtime_get_sync(ci->dev);
 621         /* Stop current role */
 622         spin_lock_irqsave(&ci->lock, flags);
 623         if (current_role == USB_ROLE_DEVICE)
 624                 cable = &ci->platdata->vbus_extcon;
 625         else if (current_role == USB_ROLE_HOST)
 626                 cable = &ci->platdata->id_extcon;
 627
 628         if (cable) {
 629                 cable->changed = true;
 630                 cable->connected = false;
 631                 ci_irq(ci);
 632                 spin_unlock_irqrestore(&ci->lock, flags);
 633                 if (ci->wq && role != USB_ROLE_NONE)
 634                         flush_workqueue(ci->wq);
 635                 spin_lock_irqsave(&ci->lock, flags);
 636         }
 637
 638         cable = NULL;
 639
 640         /* Start target role */
 641         if (role == USB_ROLE_DEVICE)
 642                 cable = &ci->platdata->vbus_extcon;
 643         else if (role == USB_ROLE_HOST)
 644                 cable = &ci->platdata->id_extcon;
 645
 646         if (cable) {
 647                 cable->changed = true;
 648                 cable->connected = true;
 649                 ci_irq(ci);
 650         }
 651         spin_unlock_irqrestore(&ci->lock, flags);
 652         pm_runtime_put_sync(ci->dev);
 653
 654         return 0;
 655 }
 656
 657 static struct usb_role_switch_desc ci_role_switch = {
 658         .set = ci_usb_role_switch_set,
 659         .get = ci_usb_role_switch_get,
 660         .allow_userspace_control = true,
 661 };
 662
 663 static int ci_get_platdata(struct device *dev,
 664                 struct ci_hdrc_platform_data *platdata)
 665 {
 666         struct extcon_dev *ext_vbus, *ext_id;
 667         struct ci_hdrc_cable *cable;
 668         int ret;
 669
 670         if (!platdata->phy_mode)
 671                 platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
 672
 673         if (!platdata->dr_mode)
 674                 platdata->dr_mode = usb_get_dr_mode(dev);
 675
 676         if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
 677                 platdata->dr_mode = USB_DR_MODE_OTG;
 678
 679         if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
 680                 /* Get the vbus regulator */
 681                 platdata->reg_vbus = devm_regulator_get_optional(dev, "vbus");
 682                 if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
 683                         return -EPROBE_DEFER;
 684                 } else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
 685                         /* no vbus regulator is needed */
 686                         platdata->reg_vbus = NULL;
 687                 } else if (IS_ERR(platdata->reg_vbus)) {
 688                         dev_err(dev, "Getting regulator error: %ld\n",
 689                                 PTR_ERR(platdata->reg_vbus));
 690                         return PTR_ERR(platdata->reg_vbus);
 691                 }
 692                 /* Get TPL support */
 693                 if (!platdata->tpl_support)
 694                         platdata->tpl_support =
 695                                 of_usb_host_tpl_support(dev->of_node);
 696         }
 697
 698         if (platdata->dr_mode == USB_DR_MODE_OTG) {
 699                 /* We can support HNP and SRP of OTG 2.0 */
 700                 platdata->ci_otg_caps.otg_rev = 0x0200;
 701                 platdata->ci_otg_caps.hnp_support = true;
 702                 platdata->ci_otg_caps.srp_support = true;
 703
 704                 /* Update otg capabilities by DT properties */
 705                 ret = of_usb_update_otg_caps(dev->of_node,
 706                                         &platdata->ci_otg_caps);
 707                 if (ret)
 708                         return ret;
 709         }
 710
 711         if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
 712                 platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
 713
 714         of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
 715                                      &platdata->phy_clkgate_delay_us);
 716
 717         platdata->itc_setting = 1;
 718
 719         of_property_read_u32(dev->of_node, "itc-setting",
 720                                         &platdata->itc_setting);
 721
 722         ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
 723                                 &platdata->ahb_burst_config);
 724         if (!ret) {
 725                 platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
 726         } else if (ret != -EINVAL) {
 727                 dev_err(dev, "failed to get ahb-burst-config\n");
 728                 return ret;
 729         }
 730
 731         ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
 732                                 &platdata->tx_burst_size);
 733         if (!ret) {
 734                 platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
 735         } else if (ret != -EINVAL) {
 736                 dev_err(dev, "failed to get tx-burst-size-dword\n");
 737                 return ret;
 738         }
 739
 740         ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
 741                                 &platdata->rx_burst_size);
 742         if (!ret) {
 743                 platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
 744         } else if (ret != -EINVAL) {
 745                 dev_err(dev, "failed to get rx-burst-size-dword\n");
 746                 return ret;
 747         }
 748
 749         if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL))
 750                 platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
 751
 752         ext_id = ERR_PTR(-ENODEV);
 753         ext_vbus = ERR_PTR(-ENODEV);
 754         if (of_property_read_bool(dev->of_node, "extcon")) {
 755                 /* Each one of them is not mandatory */
 756                 ext_vbus = extcon_get_edev_by_phandle(dev, 0);
 757                 if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
 758                         return PTR_ERR(ext_vbus);
 759
 760                 ext_id = extcon_get_edev_by_phandle(dev, 1);
 761                 if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
 762                         return PTR_ERR(ext_id);
 763         }
 764
 765         cable = &platdata->vbus_extcon;
 766         cable->nb.notifier_call = ci_cable_notifier;
 767         cable->edev = ext_vbus;
 768
 769         if (!IS_ERR(ext_vbus)) {
 770                 ret = extcon_get_state(cable->edev, EXTCON_USB);
 771                 if (ret)
 772                         cable->connected = true;
 773                 else
 774                         cable->connected = false;
 775         }
 776
 777         cable = &platdata->id_extcon;
 778         cable->nb.notifier_call = ci_cable_notifier;
 779         cable->edev = ext_id;
 780
 781         if (!IS_ERR(ext_id)) {
 782                 ret = extcon_get_state(cable->edev, EXTCON_USB_HOST);
 783                 if (ret)
 784                         cable->connected = true;
 785                 else
 786                         cable->connected = false;
 787         }
 788
 789         if (device_property_read_bool(dev, "usb-role-switch"))
 790                 ci_role_switch.fwnode = dev->fwnode;
 791
 792         platdata->pctl = devm_pinctrl_get(dev);
 793         if (!IS_ERR(platdata->pctl)) {
 794                 struct pinctrl_state *p;
 795
 796                 p = pinctrl_lookup_state(platdata->pctl, "default");
 797                 if (!IS_ERR(p))
 798                         platdata->pins_default = p;
 799
 800                 p = pinctrl_lookup_state(platdata->pctl, "host");
 801                 if (!IS_ERR(p))
 802                         platdata->pins_host = p;
 803
 804                 p = pinctrl_lookup_state(platdata->pctl, "device");
 805                 if (!IS_ERR(p))
 806                         platdata->pins_device = p;
 807         }
 808
 809         return 0;
 810 }
 811
 812 static int ci_extcon_register(struct ci_hdrc *ci)
 813 {
 814         struct ci_hdrc_cable *id, *vbus;
 815         int ret;
 816
 817         id = &ci->platdata->id_extcon;
 818         id->ci = ci;
 819         if (!IS_ERR_OR_NULL(id->edev)) {
 820                 ret = devm_extcon_register_notifier(ci->dev, id->edev,
 821                                                 EXTCON_USB_HOST, &id->nb);
 822                 if (ret < 0) {
 823                         dev_err(ci->dev, "register ID failed\n");
 824                         return ret;
 825                 }
 826         }
 827
 828         vbus = &ci->platdata->vbus_extcon;
 829         vbus->ci = ci;
 830         if (!IS_ERR_OR_NULL(vbus->edev)) {
 831                 ret = devm_extcon_register_notifier(ci->dev, vbus->edev,
 832                                                 EXTCON_USB, &vbus->nb);
 833                 if (ret < 0) {
 834                         dev_err(ci->dev, "register VBUS failed\n");
 835                         return ret;
 836                 }
 837         }
 838
 839         return 0;
 840 }
 841
 842 static DEFINE_IDA(ci_ida);
 843
 844 struct platform_device *ci_hdrc_add_device(struct device *dev,
 845                         struct resource *res, int nres,
 846                         struct ci_hdrc_platform_data *platdata)
 847 {
 848         struct platform_device *pdev;
 849         int id, ret;
 850
 851         ret = ci_get_platdata(dev, platdata);
 852         if (ret)
 853                 return ERR_PTR(ret);
 854
 855         id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
 856         if (id < 0)
 857                 return ERR_PTR(id);
 858
 859         pdev = platform_device_alloc("ci_hdrc", id);
 860         if (!pdev) {
 861                 ret = -ENOMEM;
 862                 goto put_id;
 863         }
 864
 865         pdev->dev.parent = dev;
 866
 867         ret = platform_device_add_resources(pdev, res, nres);
 868         if (ret)
 869                 goto err;
 870
 871         ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
 872         if (ret)
 873                 goto err;
 874
 875         ret = platform_device_add(pdev);
 876         if (ret)
 877                 goto err;
 878
 879         return pdev;
 880
 881 err:
 882         platform_device_put(pdev);
 883 put_id:
 884         ida_simple_remove(&ci_ida, id);
 885         return ERR_PTR(ret);
 886 }
 887 EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
 888
 889 void ci_hdrc_remove_device(struct platform_device *pdev)
 890 {
 891         int id = pdev->id;
 892         platform_device_unregister(pdev);
 893         ida_simple_remove(&ci_ida, id);
 894 }
 895 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
 896
 897 /**
 898  * ci_hdrc_query_available_role: get runtime available operation mode
 899  *
 900  * The glue layer can get current operation mode (host/peripheral/otg)
 901  * This function should be called after ci core device has created.
 902  *
 903  * @pdev: the platform device of ci core.
 904  *
 905  * Return runtime usb_dr_mode.
 906  */
 907 enum usb_dr_mode ci_hdrc_query_available_role(struct platform_device *pdev)
 908 {
 909         struct ci_hdrc *ci = platform_get_drvdata(pdev);
 910
 911         if (!ci)
 912                 return USB_DR_MODE_UNKNOWN;
 913         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])
 914                 return USB_DR_MODE_OTG;
 915         else if (ci->roles[CI_ROLE_HOST])
 916                 return USB_DR_MODE_HOST;
 917         else if (ci->roles[CI_ROLE_GADGET])
 918                 return USB_DR_MODE_PERIPHERAL;
 919         else
 920                 return USB_DR_MODE_UNKNOWN;
 921 }
 922 EXPORT_SYMBOL_GPL(ci_hdrc_query_available_role);
 923
 924 static inline void ci_role_destroy(struct ci_hdrc *ci)
 925 {
 926         ci_hdrc_gadget_destroy(ci);
 927         ci_hdrc_host_destroy(ci);
 928         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
 929                 ci_hdrc_otg_destroy(ci);
 930 }
 931
 932 static void ci_get_otg_capable(struct ci_hdrc *ci)
 933 {
 934         if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
 935                 ci->is_otg = false;
 936         else
 937                 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
 938                                 DCCPARAMS_DC | DCCPARAMS_HC)
 939                                         == (DCCPARAMS_DC | DCCPARAMS_HC));
 940         if (ci->is_otg) {
 941                 dev_dbg(ci->dev, "It is OTG capable controller\n");
 942                 /* Disable and clear all OTG irq */
 943                 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
 944                                                         OTGSC_INT_STATUS_BITS);
 945         }
 946 }
 947
 948 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
 949                           char *buf)
 950 {
 951         struct ci_hdrc *ci = dev_get_drvdata(dev);
 952
 953         if (ci->role != CI_ROLE_END)
 954                 return sprintf(buf, "%s\n", ci_role(ci)->name);
 955
 956         return 0;
 957 }
 958
 959 static ssize_t role_store(struct device *dev,
 960                 struct device_attribute *attr, const char *buf, size_t n)
 961 {
 962         struct ci_hdrc *ci = dev_get_drvdata(dev);
 963         enum ci_role role;
 964         int ret;
 965
 966         if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
 967                 dev_warn(dev, "Current configuration is not dual-role, quit\n");
 968                 return -EPERM;
 969         }
 970
 971         for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
 972                 if (!strncmp(buf, ci->roles[role]->name,
 973                              strlen(ci->roles[role]->name)))
 974                         break;
 975
 976         if (role == CI_ROLE_END)
 977                 return -EINVAL;
 978
 979         mutex_lock(&ci->mutex);
 980
 981         if (role == ci->role) {
 982                 mutex_unlock(&ci->mutex);
 983                 return n;
 984         }
 985
 986         pm_runtime_get_sync(dev);
 987         disable_irq(ci->irq);
 988         ci_role_stop(ci);
 989         ret = ci_role_start(ci, role);
 990         if (!ret && ci->role == CI_ROLE_GADGET)
 991                 ci_handle_vbus_change(ci);
 992         enable_irq(ci->irq);
 993         pm_runtime_put_sync(dev);
 994         mutex_unlock(&ci->mutex);
 995
 996         return (ret == 0) ? n : ret;
 997 }
 998 static DEVICE_ATTR_RW(role);
 999
1000 static struct attribute *ci_attrs[] = {
1001         &dev_attr_role.attr,
1002         NULL,
1003 };
1004 ATTRIBUTE_GROUPS(ci);
1005
1006 static int ci_hdrc_probe(struct platform_device *pdev)
1007 {
1008         struct device   *dev = &pdev->dev;
1009         struct ci_hdrc  *ci;
1010         struct resource *res;
1011         void __iomem    *base;
1012         int             ret;
1013         enum usb_dr_mode dr_mode;
1014
1015         if (!dev_get_platdata(dev)) {
1016                 dev_err(dev, "platform data missing\n");
1017                 return -ENODEV;
1018         }
1019
1020         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1021         base = devm_ioremap_resource(dev, res);
1022         if (IS_ERR(base))
1023                 return PTR_ERR(base);
1024
1025         ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
1026         if (!ci)
1027                 return -ENOMEM;
1028
1029         spin_lock_init(&ci->lock);
1030         mutex_init(&ci->mutex);
1031         ci->dev = dev;
1032         ci->platdata = dev_get_platdata(dev);
1033         ci->imx28_write_fix = !!(ci->platdata->flags &
1034                 CI_HDRC_IMX28_WRITE_FIX);
1035         ci->supports_runtime_pm = !!(ci->platdata->flags &
1036                 CI_HDRC_SUPPORTS_RUNTIME_PM);
1037         platform_set_drvdata(pdev, ci);
1038
1039         ret = hw_device_init(ci, base);
1040         if (ret < 0) {
1041                 dev_err(dev, "can't initialize hardware\n");
1042                 return -ENODEV;
1043         }
1044
1045         ret = ci_ulpi_init(ci);
1046         if (ret)
1047                 return ret;
1048
1049         if (ci->platdata->phy) {
1050                 ci->phy = ci->platdata->phy;
1051         } else if (ci->platdata->usb_phy) {
1052                 ci->usb_phy = ci->platdata->usb_phy;
1053         } else {
1054                 /* Look for a generic PHY first */
1055                 ci->phy = devm_phy_get(dev->parent, "usb-phy");
1056
1057                 if (PTR_ERR(ci->phy) == -EPROBE_DEFER) {
1058                         ret = -EPROBE_DEFER;
1059                         goto ulpi_exit;
1060                 } else if (IS_ERR(ci->phy)) {
1061                         ci->phy = NULL;
1062                 }
1063
1064                 /* Look for a legacy USB PHY from device-tree next */
1065                 if (!ci->phy) {
1066                         ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent,
1067                                                                   "phys", 0);
1068
1069                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1070                                 ret = -EPROBE_DEFER;
1071                                 goto ulpi_exit;
1072                         } else if (IS_ERR(ci->usb_phy)) {
1073                                 ci->usb_phy = NULL;
1074                         }
1075                 }
1076
1077                 /* Look for any registered legacy USB PHY as last resort */
1078                 if (!ci->phy && !ci->usb_phy) {
1079                         ci->usb_phy = devm_usb_get_phy(dev->parent,
1080                                                        USB_PHY_TYPE_USB2);
1081
1082                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1083                                 ret = -EPROBE_DEFER;
1084                                 goto ulpi_exit;
1085                         } else if (IS_ERR(ci->usb_phy)) {
1086                                 ci->usb_phy = NULL;
1087                         }
1088                 }
1089
1090                 /* No USB PHY was found in the end */
1091                 if (!ci->phy && !ci->usb_phy) {
1092                         ret = -ENXIO;
1093                         goto ulpi_exit;
1094                 }
1095         }
1096
1097         ret = ci_usb_phy_init(ci);
1098         if (ret) {
1099                 dev_err(dev, "unable to init phy: %d\n", ret);
1100                 goto ulpi_exit;
1101         }
1102
1103         ci->hw_bank.phys = res->start;
1104
1105         ci->irq = platform_get_irq(pdev, 0);
1106         if (ci->irq < 0) {
1107                 ret = ci->irq;
1108                 goto deinit_phy;
1109         }
1110
1111         ci_get_otg_capable(ci);
1112
1113         dr_mode = ci->platdata->dr_mode;
1114         /* initialize role(s) before the interrupt is requested */
1115         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
1116                 ret = ci_hdrc_host_init(ci);
1117                 if (ret) {
1118                         if (ret == -ENXIO)
1119                                 dev_info(dev, "doesn't support host\n");
1120                         else
1121                                 goto deinit_phy;
1122                 }
1123         }
1124
1125         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
1126                 ret = ci_hdrc_gadget_init(ci);
1127                 if (ret) {
1128                         if (ret == -ENXIO)
1129                                 dev_info(dev, "doesn't support gadget\n");
1130                         else
1131                                 goto deinit_host;
1132                 }
1133         }
1134
1135         if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
1136                 dev_err(dev, "no supported roles\n");
1137                 ret = -ENODEV;
1138                 goto deinit_gadget;
1139         }
1140
1141         if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
1142                 ret = ci_hdrc_otg_init(ci);
1143                 if (ret) {
1144                         dev_err(dev, "init otg fails, ret = %d\n", ret);
1145                         goto deinit_gadget;
1146                 }
1147         }
1148
1149         if (ci_role_switch.fwnode) {
1150                 ci_role_switch.driver_data = ci;
1151                 ci->role_switch = usb_role_switch_register(dev,
1152                                         &ci_role_switch);
1153                 if (IS_ERR(ci->role_switch)) {
1154                         ret = PTR_ERR(ci->role_switch);
1155                         goto deinit_otg;
1156                 }
1157         }
1158
1159         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
1160                 if (ci->is_otg) {
1161                         ci->role = ci_otg_role(ci);
1162                         /* Enable ID change irq */
1163                         hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
1164                 } else {
1165                         /*
1166                          * If the controller is not OTG capable, but support
1167                          * role switch, the defalt role is gadget, and the
1168                          * user can switch it through debugfs.
1169                          */
1170                         ci->role = CI_ROLE_GADGET;
1171                 }
1172         } else {
1173                 ci->role = ci->roles[CI_ROLE_HOST]
1174                         ? CI_ROLE_HOST
1175                         : CI_ROLE_GADGET;
1176         }
1177
1178         if (!ci_otg_is_fsm_mode(ci)) {
1179                 /* only update vbus status for peripheral */
1180                 if (ci->role == CI_ROLE_GADGET) {
1181                         /* Pull down DP for possible charger detection */
1182                         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1183                         ci_handle_vbus_change(ci);
1184                 }
1185
1186                 ret = ci_role_start(ci, ci->role);
1187                 if (ret) {
1188                         dev_err(dev, "can't start %s role\n",
1189                                                 ci_role(ci)->name);
1190                         goto stop;
1191                 }
1192         }
1193
1194         ret = devm_request_irq(dev, ci->irq, ci_irq_handler, IRQF_SHARED,
1195                         ci->platdata->name, ci);
1196         if (ret)
1197                 goto stop;
1198
1199         ret = ci_extcon_register(ci);
1200         if (ret)
1201                 goto stop;
1202
1203         if (ci->supports_runtime_pm) {
1204                 pm_runtime_set_active(&pdev->dev);
1205                 pm_runtime_enable(&pdev->dev);
1206                 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
1207                 pm_runtime_mark_last_busy(ci->dev);
1208                 pm_runtime_use_autosuspend(&pdev->dev);
1209         }
1210
1211         if (ci_otg_is_fsm_mode(ci))
1212                 ci_hdrc_otg_fsm_start(ci);
1213
1214         device_set_wakeup_capable(&pdev->dev, true);
1215         dbg_create_files(ci);
1216
1217         return 0;
1218
1219 stop:
1220         if (ci->role_switch)
1221                 usb_role_switch_unregister(ci->role_switch);
1222 deinit_otg:
1223         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
1224                 ci_hdrc_otg_destroy(ci);
1225 deinit_gadget:
1226         ci_hdrc_gadget_destroy(ci);
1227 deinit_host:
1228         ci_hdrc_host_destroy(ci);
1229 deinit_phy:
1230         ci_usb_phy_exit(ci);
1231 ulpi_exit:
1232         ci_ulpi_exit(ci);
1233
1234         return ret;
1235 }
1236
1237 static int ci_hdrc_remove(struct platform_device *pdev)
1238 {
1239         struct ci_hdrc *ci = platform_get_drvdata(pdev);
1240
1241         if (ci->role_switch)
1242                 usb_role_switch_unregister(ci->role_switch);
1243
1244         if (ci->supports_runtime_pm) {
1245                 pm_runtime_get_sync(&pdev->dev);
1246                 pm_runtime_disable(&pdev->dev);
1247                 pm_runtime_put_noidle(&pdev->dev);
1248         }
1249
1250         dbg_remove_files(ci);
1251         ci_role_destroy(ci);
1252         ci_hdrc_enter_lpm(ci, true);
1253         ci_usb_phy_exit(ci);
1254         ci_ulpi_exit(ci);
1255
1256         return 0;
1257 }
1258
1259 #ifdef CONFIG_PM
1260 /* Prepare wakeup by SRP before suspend */
1261 static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
1262 {
1263         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1264                                 !hw_read_otgsc(ci, OTGSC_ID)) {
1265                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
1266                                                                 PORTSC_PP);
1267                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
1268                                                                 PORTSC_WKCN);
1269         }
1270 }
1271
1272 /* Handle SRP when wakeup by data pulse */
1273 static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
1274 {
1275         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1276                 (ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
1277                 if (!hw_read_otgsc(ci, OTGSC_ID)) {
1278                         ci->fsm.a_srp_det = 1;
1279                         ci->fsm.a_bus_drop = 0;
1280                 } else {
1281                         ci->fsm.id = 1;
1282                 }
1283                 ci_otg_queue_work(ci);
1284         }
1285 }
1286
1287 static void ci_controller_suspend(struct ci_hdrc *ci)
1288 {
1289         disable_irq(ci->irq);
1290         ci_hdrc_enter_lpm(ci, true);
1291         if (ci->platdata->phy_clkgate_delay_us)
1292                 usleep_range(ci->platdata->phy_clkgate_delay_us,
1293                              ci->platdata->phy_clkgate_delay_us + 50);
1294         usb_phy_set_suspend(ci->usb_phy, 1);
1295         ci->in_lpm = true;
1296         enable_irq(ci->irq);
1297 }
1298
1299 /*
1300  * Handle the wakeup interrupt triggered by extcon connector
1301  * We need to call ci_irq again for extcon since the first
1302  * interrupt (wakeup int) only let the controller be out of
1303  * low power mode, but not handle any interrupts.
1304  */
1305 static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
1306 {
1307         struct ci_hdrc_cable *cable_id, *cable_vbus;
1308         u32 otgsc = hw_read_otgsc(ci, ~0);
1309
1310         cable_id = &ci->platdata->id_extcon;
1311         cable_vbus = &ci->platdata->vbus_extcon;
1312
1313         if (!IS_ERR(cable_id->edev) && ci->is_otg &&
1314                 (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS))
1315                 ci_irq(ci);
1316
1317         if (!IS_ERR(cable_vbus->edev) && ci->is_otg &&
1318                 (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS))
1319                 ci_irq(ci);
1320 }
1321
1322 static int ci_controller_resume(struct device *dev)
1323 {
1324         struct ci_hdrc *ci = dev_get_drvdata(dev);
1325         int ret;
1326
1327         dev_dbg(dev, "at %s\n", __func__);
1328
1329         if (!ci->in_lpm) {
1330                 WARN_ON(1);
1331                 return 0;
1332         }
1333
1334         ci_hdrc_enter_lpm(ci, false);
1335
1336         ret = ci_ulpi_resume(ci);
1337         if (ret)
1338                 return ret;
1339
1340         if (ci->usb_phy) {
1341                 usb_phy_set_suspend(ci->usb_phy, 0);
1342                 usb_phy_set_wakeup(ci->usb_phy, false);
1343                 hw_wait_phy_stable();
1344         }
1345
1346         ci->in_lpm = false;
1347         if (ci->wakeup_int) {
1348                 ci->wakeup_int = false;
1349                 pm_runtime_mark_last_busy(ci->dev);
1350                 pm_runtime_put_autosuspend(ci->dev);
1351                 enable_irq(ci->irq);
1352                 if (ci_otg_is_fsm_mode(ci))
1353                         ci_otg_fsm_wakeup_by_srp(ci);
1354                 ci_extcon_wakeup_int(ci);
1355         }
1356
1357         return 0;
1358 }
1359
1360 #ifdef CONFIG_PM_SLEEP
1361 static int ci_suspend(struct device *dev)
1362 {
1363         struct ci_hdrc *ci = dev_get_drvdata(dev);
1364
1365         if (ci->wq)
1366                 flush_workqueue(ci->wq);
1367         /*
1368          * Controller needs to be active during suspend, otherwise the core
1369          * may run resume when the parent is at suspend if other driver's
1370          * suspend fails, it occurs before parent's suspend has not started,
1371          * but the core suspend has finished.
1372          */
1373         if (ci->in_lpm)
1374                 pm_runtime_resume(dev);
1375
1376         if (ci->in_lpm) {
1377                 WARN_ON(1);
1378                 return 0;
1379         }
1380
1381         if (device_may_wakeup(dev)) {
1382                 if (ci_otg_is_fsm_mode(ci))
1383                         ci_otg_fsm_suspend_for_srp(ci);
1384
1385                 usb_phy_set_wakeup(ci->usb_phy, true);
1386                 enable_irq_wake(ci->irq);
1387         }
1388
1389         ci_controller_suspend(ci);
1390
1391         return 0;
1392 }
1393
1394 static int ci_resume(struct device *dev)
1395 {
1396         struct ci_hdrc *ci = dev_get_drvdata(dev);
1397         int ret;
1398
1399         if (device_may_wakeup(dev))
1400                 disable_irq_wake(ci->irq);
1401
1402         ret = ci_controller_resume(dev);
1403         if (ret)
1404                 return ret;
1405
1406         if (ci->supports_runtime_pm) {
1407                 pm_runtime_disable(dev);
1408                 pm_runtime_set_active(dev);
1409                 pm_runtime_enable(dev);
1410         }
1411
1412         return ret;
1413 }
1414 #endif /* CONFIG_PM_SLEEP */
1415
1416 static int ci_runtime_suspend(struct device *dev)
1417 {
1418         struct ci_hdrc *ci = dev_get_drvdata(dev);
1419
1420         dev_dbg(dev, "at %s\n", __func__);
1421
1422         if (ci->in_lpm) {
1423                 WARN_ON(1);
1424                 return 0;
1425         }
1426
1427         if (ci_otg_is_fsm_mode(ci))
1428                 ci_otg_fsm_suspend_for_srp(ci);
1429
1430         usb_phy_set_wakeup(ci->usb_phy, true);
1431         ci_controller_suspend(ci);
1432
1433         return 0;
1434 }
1435
1436 static int ci_runtime_resume(struct device *dev)
1437 {
1438         return ci_controller_resume(dev);
1439 }
1440
1441 #endif /* CONFIG_PM */
1442 static const struct dev_pm_ops ci_pm_ops = {
1443         SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
1444         SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
1445 };
1446
1447 static struct platform_driver ci_hdrc_driver = {
1448         .probe  = ci_hdrc_probe,
1449         .remove = ci_hdrc_remove,
1450         .driver = {
1451                 .name   = "ci_hdrc",
1452                 .pm     = &ci_pm_ops,
1453                 .dev_groups = ci_groups,
1454         },
1455 };
1456
1457 static int __init ci_hdrc_platform_register(void)
1458 {
1459         ci_hdrc_host_driver_init();
1460         return platform_driver_register(&ci_hdrc_driver);
1461 }
1462 module_init(ci_hdrc_platform_register);
1463
1464 static void __exit ci_hdrc_platform_unregister(void)
1465 {
1466         platform_driver_unregister(&ci_hdrc_driver);
1467 }
1468 module_exit(ci_hdrc_platform_unregister);
1469
1470 MODULE_ALIAS("platform:ci_hdrc");
1471 MODULE_LICENSE("GPL v2");
1472 MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
1473 MODULE_DESCRIPTION("ChipIdea HDRC Driver");