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 <[email protected]>
  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(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                 disable_irq_nosync(irq);
 520                 ci->wakeup_int = true;
 521                 pm_runtime_get(ci->dev);
 522                 return IRQ_HANDLED;
 523         }
 524
 525         if (ci->is_otg) {
 526                 otgsc = hw_read_otgsc(ci, ~0);
 527                 if (ci_otg_is_fsm_mode(ci)) {
 528                         ret = ci_otg_fsm_irq(ci);
 529                         if (ret == IRQ_HANDLED)
 530                                 return ret;
 531                 }
 532         }
 533
 534         /*
 535          * Handle id change interrupt, it indicates device/host function
 536          * switch.
 537          */
 538         if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
 539                 ci->id_event = true;
 540                 /* Clear ID change irq status */
 541                 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
 542                 ci_otg_queue_work(ci);
 543                 return IRQ_HANDLED;
 544         }
 545
 546         /*
 547          * Handle vbus change interrupt, it indicates device connection
 548          * and disconnection events.
 549          */
 550         if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
 551                 ci->b_sess_valid_event = true;
 552                 /* Clear BSV irq */
 553                 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
 554                 ci_otg_queue_work(ci);
 555                 return IRQ_HANDLED;
 556         }
 557
 558         /* Handle device/host interrupt */
 559         if (ci->role != CI_ROLE_END)
 560                 ret = ci_role(ci)->irq(ci);
 561
 562         return ret;
 563 }
 564
 565 static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
 566                              void *ptr)
 567 {
 568         struct ci_hdrc_cable *cbl = container_of(nb, struct ci_hdrc_cable, nb);
 569         struct ci_hdrc *ci = cbl->ci;
 570
 571         cbl->connected = event;
 572         cbl->changed = true;
 573
 574         ci_irq(ci->irq, ci);
 575         return NOTIFY_DONE;
 576 }
 577
 578 static enum usb_role ci_usb_role_switch_get(struct usb_role_switch *sw)
 579 {
 580         struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
 581         enum usb_role role;
 582         unsigned long flags;
 583
 584         spin_lock_irqsave(&ci->lock, flags);
 585         role = ci_role_to_usb_role(ci);
 586         spin_unlock_irqrestore(&ci->lock, flags);
 587
 588         return role;
 589 }
 590
 591 static int ci_usb_role_switch_set(struct usb_role_switch *sw,
 592                                   enum usb_role role)
 593 {
 594         struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
 595         struct ci_hdrc_cable *cable = NULL;
 596         enum usb_role current_role = ci_role_to_usb_role(ci);
 597         enum ci_role ci_role = usb_role_to_ci_role(role);
 598         unsigned long flags;
 599
 600         if ((ci_role != CI_ROLE_END && !ci->roles[ci_role]) ||
 601             (current_role == role))
 602                 return 0;
 603
 604         pm_runtime_get_sync(ci->dev);
 605         /* Stop current role */
 606         spin_lock_irqsave(&ci->lock, flags);
 607         if (current_role == USB_ROLE_DEVICE)
 608                 cable = &ci->platdata->vbus_extcon;
 609         else if (current_role == USB_ROLE_HOST)
 610                 cable = &ci->platdata->id_extcon;
 611
 612         if (cable) {
 613                 cable->changed = true;
 614                 cable->connected = false;
 615                 ci_irq(ci->irq, ci);
 616                 spin_unlock_irqrestore(&ci->lock, flags);
 617                 if (ci->wq && role != USB_ROLE_NONE)
 618                         flush_workqueue(ci->wq);
 619                 spin_lock_irqsave(&ci->lock, flags);
 620         }
 621
 622         cable = NULL;
 623
 624         /* Start target role */
 625         if (role == USB_ROLE_DEVICE)
 626                 cable = &ci->platdata->vbus_extcon;
 627         else if (role == USB_ROLE_HOST)
 628                 cable = &ci->platdata->id_extcon;
 629
 630         if (cable) {
 631                 cable->changed = true;
 632                 cable->connected = true;
 633                 ci_irq(ci->irq, ci);
 634         }
 635         spin_unlock_irqrestore(&ci->lock, flags);
 636         pm_runtime_put_sync(ci->dev);
 637
 638         return 0;
 639 }
 640
 641 static struct usb_role_switch_desc ci_role_switch = {
 642         .set = ci_usb_role_switch_set,
 643         .get = ci_usb_role_switch_get,
 644         .allow_userspace_control = true,
 645 };
 646
 647 static int ci_get_platdata(struct device *dev,
 648                 struct ci_hdrc_platform_data *platdata)
 649 {
 650         struct extcon_dev *ext_vbus, *ext_id;
 651         struct ci_hdrc_cable *cable;
 652         int ret;
 653
 654         if (!platdata->phy_mode)
 655                 platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
 656
 657         if (!platdata->dr_mode)
 658                 platdata->dr_mode = usb_get_dr_mode(dev);
 659
 660         if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
 661                 platdata->dr_mode = USB_DR_MODE_OTG;
 662
 663         if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
 664                 /* Get the vbus regulator */
 665                 platdata->reg_vbus = devm_regulator_get_optional(dev, "vbus");
 666                 if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
 667                         return -EPROBE_DEFER;
 668                 } else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
 669                         /* no vbus regulator is needed */
 670                         platdata->reg_vbus = NULL;
 671                 } else if (IS_ERR(platdata->reg_vbus)) {
 672                         dev_err(dev, "Getting regulator error: %ld\n",
 673                                 PTR_ERR(platdata->reg_vbus));
 674                         return PTR_ERR(platdata->reg_vbus);
 675                 }
 676                 /* Get TPL support */
 677                 if (!platdata->tpl_support)
 678                         platdata->tpl_support =
 679                                 of_usb_host_tpl_support(dev->of_node);
 680         }
 681
 682         if (platdata->dr_mode == USB_DR_MODE_OTG) {
 683                 /* We can support HNP and SRP of OTG 2.0 */
 684                 platdata->ci_otg_caps.otg_rev = 0x0200;
 685                 platdata->ci_otg_caps.hnp_support = true;
 686                 platdata->ci_otg_caps.srp_support = true;
 687
 688                 /* Update otg capabilities by DT properties */
 689                 ret = of_usb_update_otg_caps(dev->of_node,
 690                                         &platdata->ci_otg_caps);
 691                 if (ret)
 692                         return ret;
 693         }
 694
 695         if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
 696                 platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
 697
 698         of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
 699                                      &platdata->phy_clkgate_delay_us);
 700
 701         platdata->itc_setting = 1;
 702
 703         of_property_read_u32(dev->of_node, "itc-setting",
 704                                         &platdata->itc_setting);
 705
 706         ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
 707                                 &platdata->ahb_burst_config);
 708         if (!ret) {
 709                 platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
 710         } else if (ret != -EINVAL) {
 711                 dev_err(dev, "failed to get ahb-burst-config\n");
 712                 return ret;
 713         }
 714
 715         ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
 716                                 &platdata->tx_burst_size);
 717         if (!ret) {
 718                 platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
 719         } else if (ret != -EINVAL) {
 720                 dev_err(dev, "failed to get tx-burst-size-dword\n");
 721                 return ret;
 722         }
 723
 724         ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
 725                                 &platdata->rx_burst_size);
 726         if (!ret) {
 727                 platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
 728         } else if (ret != -EINVAL) {
 729                 dev_err(dev, "failed to get rx-burst-size-dword\n");
 730                 return ret;
 731         }
 732
 733         if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL))
 734                 platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
 735
 736         ext_id = ERR_PTR(-ENODEV);
 737         ext_vbus = ERR_PTR(-ENODEV);
 738         if (of_property_read_bool(dev->of_node, "extcon")) {
 739                 /* Each one of them is not mandatory */
 740                 ext_vbus = extcon_get_edev_by_phandle(dev, 0);
 741                 if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
 742                         return PTR_ERR(ext_vbus);
 743
 744                 ext_id = extcon_get_edev_by_phandle(dev, 1);
 745                 if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
 746                         return PTR_ERR(ext_id);
 747         }
 748
 749         cable = &platdata->vbus_extcon;
 750         cable->nb.notifier_call = ci_cable_notifier;
 751         cable->edev = ext_vbus;
 752
 753         if (!IS_ERR(ext_vbus)) {
 754                 ret = extcon_get_state(cable->edev, EXTCON_USB);
 755                 if (ret)
 756                         cable->connected = true;
 757                 else
 758                         cable->connected = false;
 759         }
 760
 761         cable = &platdata->id_extcon;
 762         cable->nb.notifier_call = ci_cable_notifier;
 763         cable->edev = ext_id;
 764
 765         if (!IS_ERR(ext_id)) {
 766                 ret = extcon_get_state(cable->edev, EXTCON_USB_HOST);
 767                 if (ret)
 768                         cable->connected = true;
 769                 else
 770                         cable->connected = false;
 771         }
 772
 773         if (device_property_read_bool(dev, "usb-role-switch"))
 774                 ci_role_switch.fwnode = dev->fwnode;
 775
 776         platdata->pctl = devm_pinctrl_get(dev);
 777         if (!IS_ERR(platdata->pctl)) {
 778                 struct pinctrl_state *p;
 779
 780                 p = pinctrl_lookup_state(platdata->pctl, "default");
 781                 if (!IS_ERR(p))
 782                         platdata->pins_default = p;
 783
 784                 p = pinctrl_lookup_state(platdata->pctl, "host");
 785                 if (!IS_ERR(p))
 786                         platdata->pins_host = p;
 787
 788                 p = pinctrl_lookup_state(platdata->pctl, "device");
 789                 if (!IS_ERR(p))
 790                         platdata->pins_device = p;
 791         }
 792
 793         return 0;
 794 }
 795
 796 static int ci_extcon_register(struct ci_hdrc *ci)
 797 {
 798         struct ci_hdrc_cable *id, *vbus;
 799         int ret;
 800
 801         id = &ci->platdata->id_extcon;
 802         id->ci = ci;
 803         if (!IS_ERR_OR_NULL(id->edev)) {
 804                 ret = devm_extcon_register_notifier(ci->dev, id->edev,
 805                                                 EXTCON_USB_HOST, &id->nb);
 806                 if (ret < 0) {
 807                         dev_err(ci->dev, "register ID failed\n");
 808                         return ret;
 809                 }
 810         }
 811
 812         vbus = &ci->platdata->vbus_extcon;
 813         vbus->ci = ci;
 814         if (!IS_ERR_OR_NULL(vbus->edev)) {
 815                 ret = devm_extcon_register_notifier(ci->dev, vbus->edev,
 816                                                 EXTCON_USB, &vbus->nb);
 817                 if (ret < 0) {
 818                         dev_err(ci->dev, "register VBUS failed\n");
 819                         return ret;
 820                 }
 821         }
 822
 823         return 0;
 824 }
 825
 826 static DEFINE_IDA(ci_ida);
 827
 828 struct platform_device *ci_hdrc_add_device(struct device *dev,
 829                         struct resource *res, int nres,
 830                         struct ci_hdrc_platform_data *platdata)
 831 {
 832         struct platform_device *pdev;
 833         int id, ret;
 834
 835         ret = ci_get_platdata(dev, platdata);
 836         if (ret)
 837                 return ERR_PTR(ret);
 838
 839         id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
 840         if (id < 0)
 841                 return ERR_PTR(id);
 842
 843         pdev = platform_device_alloc("ci_hdrc", id);
 844         if (!pdev) {
 845                 ret = -ENOMEM;
 846                 goto put_id;
 847         }
 848
 849         pdev->dev.parent = dev;
 850
 851         ret = platform_device_add_resources(pdev, res, nres);
 852         if (ret)
 853                 goto err;
 854
 855         ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
 856         if (ret)
 857                 goto err;
 858
 859         ret = platform_device_add(pdev);
 860         if (ret)
 861                 goto err;
 862
 863         return pdev;
 864
 865 err:
 866         platform_device_put(pdev);
 867 put_id:
 868         ida_simple_remove(&ci_ida, id);
 869         return ERR_PTR(ret);
 870 }
 871 EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
 872
 873 void ci_hdrc_remove_device(struct platform_device *pdev)
 874 {
 875         int id = pdev->id;
 876         platform_device_unregister(pdev);
 877         ida_simple_remove(&ci_ida, id);
 878 }
 879 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
 880
 881 /**
 882  * ci_hdrc_query_available_role: get runtime available operation mode
 883  *
 884  * The glue layer can get current operation mode (host/peripheral/otg)
 885  * This function should be called after ci core device has created.
 886  *
 887  * @pdev: the platform device of ci core.
 888  *
 889  * Return runtime usb_dr_mode.
 890  */
 891 enum usb_dr_mode ci_hdrc_query_available_role(struct platform_device *pdev)
 892 {
 893         struct ci_hdrc *ci = platform_get_drvdata(pdev);
 894
 895         if (!ci)
 896                 return USB_DR_MODE_UNKNOWN;
 897         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])
 898                 return USB_DR_MODE_OTG;
 899         else if (ci->roles[CI_ROLE_HOST])
 900                 return USB_DR_MODE_HOST;
 901         else if (ci->roles[CI_ROLE_GADGET])
 902                 return USB_DR_MODE_PERIPHERAL;
 903         else
 904                 return USB_DR_MODE_UNKNOWN;
 905 }
 906 EXPORT_SYMBOL_GPL(ci_hdrc_query_available_role);
 907
 908 static inline void ci_role_destroy(struct ci_hdrc *ci)
 909 {
 910         ci_hdrc_gadget_destroy(ci);
 911         ci_hdrc_host_destroy(ci);
 912         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
 913                 ci_hdrc_otg_destroy(ci);
 914 }
 915
 916 static void ci_get_otg_capable(struct ci_hdrc *ci)
 917 {
 918         if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
 919                 ci->is_otg = false;
 920         else
 921                 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
 922                                 DCCPARAMS_DC | DCCPARAMS_HC)
 923                                         == (DCCPARAMS_DC | DCCPARAMS_HC));
 924         if (ci->is_otg) {
 925                 dev_dbg(ci->dev, "It is OTG capable controller\n");
 926                 /* Disable and clear all OTG irq */
 927                 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
 928                                                         OTGSC_INT_STATUS_BITS);
 929         }
 930 }
 931
 932 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
 933                           char *buf)
 934 {
 935         struct ci_hdrc *ci = dev_get_drvdata(dev);
 936
 937         if (ci->role != CI_ROLE_END)
 938                 return sprintf(buf, "%s\n", ci_role(ci)->name);
 939
 940         return 0;
 941 }
 942
 943 static ssize_t role_store(struct device *dev,
 944                 struct device_attribute *attr, const char *buf, size_t n)
 945 {
 946         struct ci_hdrc *ci = dev_get_drvdata(dev);
 947         enum ci_role role;
 948         int ret;
 949
 950         if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
 951                 dev_warn(dev, "Current configuration is not dual-role, quit\n");
 952                 return -EPERM;
 953         }
 954
 955         for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
 956                 if (!strncmp(buf, ci->roles[role]->name,
 957                              strlen(ci->roles[role]->name)))
 958                         break;
 959
 960         if (role == CI_ROLE_END || role == ci->role)
 961                 return -EINVAL;
 962
 963         pm_runtime_get_sync(dev);
 964         disable_irq(ci->irq);
 965         ci_role_stop(ci);
 966         ret = ci_role_start(ci, role);
 967         if (!ret && ci->role == CI_ROLE_GADGET)
 968                 ci_handle_vbus_change(ci);
 969         enable_irq(ci->irq);
 970         pm_runtime_put_sync(dev);
 971
 972         return (ret == 0) ? n : ret;
 973 }
 974 static DEVICE_ATTR_RW(role);
 975
 976 static struct attribute *ci_attrs[] = {
 977         &dev_attr_role.attr,
 978         NULL,
 979 };
 980 ATTRIBUTE_GROUPS(ci);
 981
 982 static int ci_hdrc_probe(struct platform_device *pdev)
 983 {
 984         struct device   *dev = &pdev->dev;
 985         struct ci_hdrc  *ci;
 986         struct resource *res;
 987         void __iomem    *base;
 988         int             ret;
 989         enum usb_dr_mode dr_mode;
 990
 991         if (!dev_get_platdata(dev)) {
 992                 dev_err(dev, "platform data missing\n");
 993                 return -ENODEV;
 994         }
 995
 996         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 997         base = devm_ioremap_resource(dev, res);
 998         if (IS_ERR(base))
 999                 return PTR_ERR(base);
1000
1001         ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
1002         if (!ci)
1003                 return -ENOMEM;
1004
1005         spin_lock_init(&ci->lock);
1006         ci->dev = dev;
1007         ci->platdata = dev_get_platdata(dev);
1008         ci->imx28_write_fix = !!(ci->platdata->flags &
1009                 CI_HDRC_IMX28_WRITE_FIX);
1010         ci->supports_runtime_pm = !!(ci->platdata->flags &
1011                 CI_HDRC_SUPPORTS_RUNTIME_PM);
1012         platform_set_drvdata(pdev, ci);
1013
1014         ret = hw_device_init(ci, base);
1015         if (ret < 0) {
1016                 dev_err(dev, "can't initialize hardware\n");
1017                 return -ENODEV;
1018         }
1019
1020         ret = ci_ulpi_init(ci);
1021         if (ret)
1022                 return ret;
1023
1024         if (ci->platdata->phy) {
1025                 ci->phy = ci->platdata->phy;
1026         } else if (ci->platdata->usb_phy) {
1027                 ci->usb_phy = ci->platdata->usb_phy;
1028         } else {
1029                 /* Look for a generic PHY first */
1030                 ci->phy = devm_phy_get(dev->parent, "usb-phy");
1031
1032                 if (PTR_ERR(ci->phy) == -EPROBE_DEFER) {
1033                         ret = -EPROBE_DEFER;
1034                         goto ulpi_exit;
1035                 } else if (IS_ERR(ci->phy)) {
1036                         ci->phy = NULL;
1037                 }
1038
1039                 /* Look for a legacy USB PHY from device-tree next */
1040                 if (!ci->phy) {
1041                         ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent,
1042                                                                   "phys", 0);
1043
1044                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1045                                 ret = -EPROBE_DEFER;
1046                                 goto ulpi_exit;
1047                         } else if (IS_ERR(ci->usb_phy)) {
1048                                 ci->usb_phy = NULL;
1049                         }
1050                 }
1051
1052                 /* Look for any registered legacy USB PHY as last resort */
1053                 if (!ci->phy && !ci->usb_phy) {
1054                         ci->usb_phy = devm_usb_get_phy(dev->parent,
1055                                                        USB_PHY_TYPE_USB2);
1056
1057                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1058                                 ret = -EPROBE_DEFER;
1059                                 goto ulpi_exit;
1060                         } else if (IS_ERR(ci->usb_phy)) {
1061                                 ci->usb_phy = NULL;
1062                         }
1063                 }
1064
1065                 /* No USB PHY was found in the end */
1066                 if (!ci->phy && !ci->usb_phy) {
1067                         ret = -ENXIO;
1068                         goto ulpi_exit;
1069                 }
1070         }
1071
1072         ret = ci_usb_phy_init(ci);
1073         if (ret) {
1074                 dev_err(dev, "unable to init phy: %d\n", ret);
1075                 return ret;
1076         }
1077
1078         ci->hw_bank.phys = res->start;
1079
1080         ci->irq = platform_get_irq(pdev, 0);
1081         if (ci->irq < 0) {
1082                 ret = ci->irq;
1083                 goto deinit_phy;
1084         }
1085
1086         ci_get_otg_capable(ci);
1087
1088         dr_mode = ci->platdata->dr_mode;
1089         /* initialize role(s) before the interrupt is requested */
1090         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
1091                 ret = ci_hdrc_host_init(ci);
1092                 if (ret) {
1093                         if (ret == -ENXIO)
1094                                 dev_info(dev, "doesn't support host\n");
1095                         else
1096                                 goto deinit_phy;
1097                 }
1098         }
1099
1100         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
1101                 ret = ci_hdrc_gadget_init(ci);
1102                 if (ret) {
1103                         if (ret == -ENXIO)
1104                                 dev_info(dev, "doesn't support gadget\n");
1105                         else
1106                                 goto deinit_host;
1107                 }
1108         }
1109
1110         if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
1111                 dev_err(dev, "no supported roles\n");
1112                 ret = -ENODEV;
1113                 goto deinit_gadget;
1114         }
1115
1116         if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
1117                 ret = ci_hdrc_otg_init(ci);
1118                 if (ret) {
1119                         dev_err(dev, "init otg fails, ret = %d\n", ret);
1120                         goto deinit_gadget;
1121                 }
1122         }
1123
1124         if (ci_role_switch.fwnode) {
1125                 ci_role_switch.driver_data = ci;
1126                 ci->role_switch = usb_role_switch_register(dev,
1127                                         &ci_role_switch);
1128                 if (IS_ERR(ci->role_switch)) {
1129                         ret = PTR_ERR(ci->role_switch);
1130                         goto deinit_otg;
1131                 }
1132         }
1133
1134         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
1135                 if (ci->is_otg) {
1136                         ci->role = ci_otg_role(ci);
1137                         /* Enable ID change irq */
1138                         hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
1139                 } else {
1140                         /*
1141                          * If the controller is not OTG capable, but support
1142                          * role switch, the defalt role is gadget, and the
1143                          * user can switch it through debugfs.
1144                          */
1145                         ci->role = CI_ROLE_GADGET;
1146                 }
1147         } else {
1148                 ci->role = ci->roles[CI_ROLE_HOST]
1149                         ? CI_ROLE_HOST
1150                         : CI_ROLE_GADGET;
1151         }
1152
1153         if (!ci_otg_is_fsm_mode(ci)) {
1154                 /* only update vbus status for peripheral */
1155                 if (ci->role == CI_ROLE_GADGET) {
1156                         /* Pull down DP for possible charger detection */
1157                         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1158                         ci_handle_vbus_change(ci);
1159                 }
1160
1161                 ret = ci_role_start(ci, ci->role);
1162                 if (ret) {
1163                         dev_err(dev, "can't start %s role\n",
1164                                                 ci_role(ci)->name);
1165                         goto stop;
1166                 }
1167         }
1168
1169         ret = devm_request_irq(dev, ci->irq, ci_irq, IRQF_SHARED,
1170                         ci->platdata->name, ci);
1171         if (ret)
1172                 goto stop;
1173
1174         ret = ci_extcon_register(ci);
1175         if (ret)
1176                 goto stop;
1177
1178         if (ci->supports_runtime_pm) {
1179                 pm_runtime_set_active(&pdev->dev);
1180                 pm_runtime_enable(&pdev->dev);
1181                 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
1182                 pm_runtime_mark_last_busy(ci->dev);
1183                 pm_runtime_use_autosuspend(&pdev->dev);
1184         }
1185
1186         if (ci_otg_is_fsm_mode(ci))
1187                 ci_hdrc_otg_fsm_start(ci);
1188
1189         device_set_wakeup_capable(&pdev->dev, true);
1190         dbg_create_files(ci);
1191
1192         return 0;
1193
1194 stop:
1195         if (ci->role_switch)
1196                 usb_role_switch_unregister(ci->role_switch);
1197 deinit_otg:
1198         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
1199                 ci_hdrc_otg_destroy(ci);
1200 deinit_gadget:
1201         ci_hdrc_gadget_destroy(ci);
1202 deinit_host:
1203         ci_hdrc_host_destroy(ci);
1204 deinit_phy:
1205         ci_usb_phy_exit(ci);
1206 ulpi_exit:
1207         ci_ulpi_exit(ci);
1208
1209         return ret;
1210 }
1211
1212 static int ci_hdrc_remove(struct platform_device *pdev)
1213 {
1214         struct ci_hdrc *ci = platform_get_drvdata(pdev);
1215
1216         if (ci->role_switch)
1217                 usb_role_switch_unregister(ci->role_switch);
1218
1219         if (ci->supports_runtime_pm) {
1220                 pm_runtime_get_sync(&pdev->dev);
1221                 pm_runtime_disable(&pdev->dev);
1222                 pm_runtime_put_noidle(&pdev->dev);
1223         }
1224
1225         dbg_remove_files(ci);
1226         ci_role_destroy(ci);
1227         ci_hdrc_enter_lpm(ci, true);
1228         ci_usb_phy_exit(ci);
1229         ci_ulpi_exit(ci);
1230
1231         return 0;
1232 }
1233
1234 #ifdef CONFIG_PM
1235 /* Prepare wakeup by SRP before suspend */
1236 static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
1237 {
1238         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1239                                 !hw_read_otgsc(ci, OTGSC_ID)) {
1240                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
1241                                                                 PORTSC_PP);
1242                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
1243                                                                 PORTSC_WKCN);
1244         }
1245 }
1246
1247 /* Handle SRP when wakeup by data pulse */
1248 static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
1249 {
1250         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1251                 (ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
1252                 if (!hw_read_otgsc(ci, OTGSC_ID)) {
1253                         ci->fsm.a_srp_det = 1;
1254                         ci->fsm.a_bus_drop = 0;
1255                 } else {
1256                         ci->fsm.id = 1;
1257                 }
1258                 ci_otg_queue_work(ci);
1259         }
1260 }
1261
1262 static void ci_controller_suspend(struct ci_hdrc *ci)
1263 {
1264         disable_irq(ci->irq);
1265         ci_hdrc_enter_lpm(ci, true);
1266         if (ci->platdata->phy_clkgate_delay_us)
1267                 usleep_range(ci->platdata->phy_clkgate_delay_us,
1268                              ci->platdata->phy_clkgate_delay_us + 50);
1269         usb_phy_set_suspend(ci->usb_phy, 1);
1270         ci->in_lpm = true;
1271         enable_irq(ci->irq);
1272 }
1273
1274 /*
1275  * Handle the wakeup interrupt triggered by extcon connector
1276  * We need to call ci_irq again for extcon since the first
1277  * interrupt (wakeup int) only let the controller be out of
1278  * low power mode, but not handle any interrupts.
1279  */
1280 static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
1281 {
1282         struct ci_hdrc_cable *cable_id, *cable_vbus;
1283         u32 otgsc = hw_read_otgsc(ci, ~0);
1284
1285         cable_id = &ci->platdata->id_extcon;
1286         cable_vbus = &ci->platdata->vbus_extcon;
1287
1288         if (!IS_ERR(cable_id->edev) && ci->is_otg &&
1289                 (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS))
1290                 ci_irq(ci->irq, ci);
1291
1292         if (!IS_ERR(cable_vbus->edev) && ci->is_otg &&
1293                 (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS))
1294                 ci_irq(ci->irq, ci);
1295 }
1296
1297 static int ci_controller_resume(struct device *dev)
1298 {
1299         struct ci_hdrc *ci = dev_get_drvdata(dev);
1300         int ret;
1301
1302         dev_dbg(dev, "at %s\n", __func__);
1303
1304         if (!ci->in_lpm) {
1305                 WARN_ON(1);
1306                 return 0;
1307         }
1308
1309         ci_hdrc_enter_lpm(ci, false);
1310
1311         ret = ci_ulpi_resume(ci);
1312         if (ret)
1313                 return ret;
1314
1315         if (ci->usb_phy) {
1316                 usb_phy_set_suspend(ci->usb_phy, 0);
1317                 usb_phy_set_wakeup(ci->usb_phy, false);
1318                 hw_wait_phy_stable();
1319         }
1320
1321         ci->in_lpm = false;
1322         if (ci->wakeup_int) {
1323                 ci->wakeup_int = false;
1324                 pm_runtime_mark_last_busy(ci->dev);
1325                 pm_runtime_put_autosuspend(ci->dev);
1326                 enable_irq(ci->irq);
1327                 if (ci_otg_is_fsm_mode(ci))
1328                         ci_otg_fsm_wakeup_by_srp(ci);
1329                 ci_extcon_wakeup_int(ci);
1330         }
1331
1332         return 0;
1333 }
1334
1335 #ifdef CONFIG_PM_SLEEP
1336 static int ci_suspend(struct device *dev)
1337 {
1338         struct ci_hdrc *ci = dev_get_drvdata(dev);
1339
1340         if (ci->wq)
1341                 flush_workqueue(ci->wq);
1342         /*
1343          * Controller needs to be active during suspend, otherwise the core
1344          * may run resume when the parent is at suspend if other driver's
1345          * suspend fails, it occurs before parent's suspend has not started,
1346          * but the core suspend has finished.
1347          */
1348         if (ci->in_lpm)
1349                 pm_runtime_resume(dev);
1350
1351         if (ci->in_lpm) {
1352                 WARN_ON(1);
1353                 return 0;
1354         }
1355
1356         if (device_may_wakeup(dev)) {
1357                 if (ci_otg_is_fsm_mode(ci))
1358                         ci_otg_fsm_suspend_for_srp(ci);
1359
1360                 usb_phy_set_wakeup(ci->usb_phy, true);
1361                 enable_irq_wake(ci->irq);
1362         }
1363
1364         ci_controller_suspend(ci);
1365
1366         return 0;
1367 }
1368
1369 static int ci_resume(struct device *dev)
1370 {
1371         struct ci_hdrc *ci = dev_get_drvdata(dev);
1372         int ret;
1373
1374         if (device_may_wakeup(dev))
1375                 disable_irq_wake(ci->irq);
1376
1377         ret = ci_controller_resume(dev);
1378         if (ret)
1379                 return ret;
1380
1381         if (ci->supports_runtime_pm) {
1382                 pm_runtime_disable(dev);
1383                 pm_runtime_set_active(dev);
1384                 pm_runtime_enable(dev);
1385         }
1386
1387         return ret;
1388 }
1389 #endif /* CONFIG_PM_SLEEP */
1390
1391 static int ci_runtime_suspend(struct device *dev)
1392 {
1393         struct ci_hdrc *ci = dev_get_drvdata(dev);
1394
1395         dev_dbg(dev, "at %s\n", __func__);
1396
1397         if (ci->in_lpm) {
1398                 WARN_ON(1);
1399                 return 0;
1400         }
1401
1402         if (ci_otg_is_fsm_mode(ci))
1403                 ci_otg_fsm_suspend_for_srp(ci);
1404
1405         usb_phy_set_wakeup(ci->usb_phy, true);
1406         ci_controller_suspend(ci);
1407
1408         return 0;
1409 }
1410
1411 static int ci_runtime_resume(struct device *dev)
1412 {
1413         return ci_controller_resume(dev);
1414 }
1415
1416 #endif /* CONFIG_PM */
1417 static const struct dev_pm_ops ci_pm_ops = {
1418         SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
1419         SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
1420 };
1421
1422 static struct platform_driver ci_hdrc_driver = {
1423         .probe  = ci_hdrc_probe,
1424         .remove = ci_hdrc_remove,
1425         .driver = {
1426                 .name   = "ci_hdrc",
1427                 .pm     = &ci_pm_ops,
1428                 .dev_groups = ci_groups,
1429         },
1430 };
1431
1432 static int __init ci_hdrc_platform_register(void)
1433 {
1434         ci_hdrc_host_driver_init();
1435         return platform_driver_register(&ci_hdrc_driver);
1436 }
1437 module_init(ci_hdrc_platform_register);
1438
1439 static void __exit ci_hdrc_platform_unregister(void)
1440 {
1441         platform_driver_unregister(&ci_hdrc_driver);
1442 }
1443 module_exit(ci_hdrc_platform_unregister);
1444
1445 MODULE_ALIAS("platform:ci_hdrc");
1446 MODULE_LICENSE("GPL v2");
1447 MODULE_AUTHOR("David Lopo <[email protected]>");
1448 MODULE_DESCRIPTION("ChipIdea HDRC Driver");