drivers/usb/chipidea/core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * core.c - ChipIdea USB IP core family device controller
   4  *
   5  * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
   6  *
   7  * Author: David Lopo
   8  */
   9
  10 /*
  11  * Description: ChipIdea USB IP core family device controller
  12  *
  13  * This driver is composed of several blocks:
  14  * - HW:     hardware interface
  15  * - DBG:    debug facilities (optional)
  16  * - UTIL:   utilities
  17  * - ISR:    interrupts handling
  18  * - ENDPT:  endpoint operations (Gadget API)
  19  * - GADGET: gadget operations (Gadget API)
  20  * - BUS:    bus glue code, bus abstraction layer
  21  *
  22  * Compile Options
  23  * - STALL_IN:  non-empty bulk-in pipes cannot be halted
  24  *              if defined mass storage compliance succeeds but with warnings
  25  *              => case 4: Hi >  Dn
  26  *              => case 5: Hi >  Di
  27  *              => case 8: Hi <> Do
  28  *              if undefined usbtest 13 fails
  29  * - TRACE:     enable function tracing (depends on DEBUG)
  30  *
  31  * Main Features
  32  * - Chapter 9 & Mass Storage Compliance with Gadget File Storage
  33  * - Chapter 9 Compliance with Gadget Zero (STALL_IN undefined)
  34  * - Normal & LPM support
  35  *
  36  * USBTEST Report
  37  * - OK: 0-12, 13 (STALL_IN defined) & 14
  38  * - Not Supported: 15 & 16 (ISO)
  39  *
  40  * TODO List
  41  * - Suspend & Remote Wakeup
  42  */
  43 #include <linux/delay.h>
  44 #include <linux/device.h>
  45 #include <linux/dma-mapping.h>
  46 #include <linux/extcon.h>
  47 #include <linux/phy/phy.h>
  48 #include <linux/platform_device.h>
  49 #include <linux/module.h>
  50 #include <linux/idr.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/io.h>
  53 #include <linux/kernel.h>
  54 #include <linux/slab.h>
  55 #include <linux/pm_runtime.h>
  56 #include <linux/pinctrl/consumer.h>
  57 #include <linux/usb/ch9.h>
  58 #include <linux/usb/gadget.h>
  59 #include <linux/usb/otg.h>
  60 #include <linux/usb/chipidea.h>
  61 #include <linux/usb/of.h>
  62 #include <linux/of.h>
  63 #include <linux/regulator/consumer.h>
  64 #include <linux/usb/ehci_def.h>
  65
  66 #include "ci.h"
  67 #include "udc.h"
  68 #include "bits.h"
  69 #include "host.h"
  70 #include "otg.h"
  71 #include "otg_fsm.h"
  72
  73 /* Controller register map */
  74 static const u8 ci_regs_nolpm[] = {
  75         [CAP_CAPLENGTH]         = 0x00U,
  76         [CAP_HCCPARAMS]         = 0x08U,
  77         [CAP_DCCPARAMS]         = 0x24U,
  78         [CAP_TESTMODE]          = 0x38U,
  79         [OP_USBCMD]             = 0x00U,
  80         [OP_USBSTS]             = 0x04U,
  81         [OP_USBINTR]            = 0x08U,
  82         [OP_DEVICEADDR]         = 0x14U,
  83         [OP_ENDPTLISTADDR]      = 0x18U,
  84         [OP_TTCTRL]             = 0x1CU,
  85         [OP_BURSTSIZE]          = 0x20U,
  86         [OP_ULPI_VIEWPORT]      = 0x30U,
  87         [OP_PORTSC]             = 0x44U,
  88         [OP_DEVLC]              = 0x84U,
  89         [OP_OTGSC]              = 0x64U,
  90         [OP_USBMODE]            = 0x68U,
  91         [OP_ENDPTSETUPSTAT]     = 0x6CU,
  92         [OP_ENDPTPRIME]         = 0x70U,
  93         [OP_ENDPTFLUSH]         = 0x74U,
  94         [OP_ENDPTSTAT]          = 0x78U,
  95         [OP_ENDPTCOMPLETE]      = 0x7CU,
  96         [OP_ENDPTCTRL]          = 0x80U,
  97 };
  98
  99 static const u8 ci_regs_lpm[] = {
 100         [CAP_CAPLENGTH]         = 0x00U,
 101         [CAP_HCCPARAMS]         = 0x08U,
 102         [CAP_DCCPARAMS]         = 0x24U,
 103         [CAP_TESTMODE]          = 0xFCU,
 104         [OP_USBCMD]             = 0x00U,
 105         [OP_USBSTS]             = 0x04U,
 106         [OP_USBINTR]            = 0x08U,
 107         [OP_DEVICEADDR]         = 0x14U,
 108         [OP_ENDPTLISTADDR]      = 0x18U,
 109         [OP_TTCTRL]             = 0x1CU,
 110         [OP_BURSTSIZE]          = 0x20U,
 111         [OP_ULPI_VIEWPORT]      = 0x30U,
 112         [OP_PORTSC]             = 0x44U,
 113         [OP_DEVLC]              = 0x84U,
 114         [OP_OTGSC]              = 0xC4U,
 115         [OP_USBMODE]            = 0xC8U,
 116         [OP_ENDPTSETUPSTAT]     = 0xD8U,
 117         [OP_ENDPTPRIME]         = 0xDCU,
 118         [OP_ENDPTFLUSH]         = 0xE0U,
 119         [OP_ENDPTSTAT]          = 0xE4U,
 120         [OP_ENDPTCOMPLETE]      = 0xE8U,
 121         [OP_ENDPTCTRL]          = 0xECU,
 122 };
 123
 124 static void hw_alloc_regmap(struct ci_hdrc *ci, bool is_lpm)
 125 {
 126         int i;
 127
 128         for (i = 0; i < OP_ENDPTCTRL; i++)
 129                 ci->hw_bank.regmap[i] =
 130                         (i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
 131                         (is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
 132
 133         for (; i <= OP_LAST; i++)
 134                 ci->hw_bank.regmap[i] = ci->hw_bank.op +
 135                         4 * (i - OP_ENDPTCTRL) +
 136                         (is_lpm
 137                          ? ci_regs_lpm[OP_ENDPTCTRL]
 138                          : ci_regs_nolpm[OP_ENDPTCTRL]);
 139
 140 }
 141
 142 static enum ci_revision ci_get_revision(struct ci_hdrc *ci)
 143 {
 144         int ver = hw_read_id_reg(ci, ID_ID, VERSION) >> __ffs(VERSION);
 145         enum ci_revision rev = CI_REVISION_UNKNOWN;
 146
 147         if (ver == 0x2) {
 148                 rev = hw_read_id_reg(ci, ID_ID, REVISION)
 149                         >> __ffs(REVISION);
 150                 rev += CI_REVISION_20;
 151         } else if (ver == 0x0) {
 152                 rev = CI_REVISION_1X;
 153         }
 154
 155         return rev;
 156 }
 157
 158 /**
 159  * hw_read_intr_enable: returns interrupt enable register
 160  *
 161  * @ci: the controller
 162  *
 163  * This function returns register data
 164  */
 165 u32 hw_read_intr_enable(struct ci_hdrc *ci)
 166 {
 167         return hw_read(ci, OP_USBINTR, ~0);
 168 }
 169
 170 /**
 171  * hw_read_intr_status: returns interrupt status register
 172  *
 173  * @ci: the controller
 174  *
 175  * This function returns register data
 176  */
 177 u32 hw_read_intr_status(struct ci_hdrc *ci)
 178 {
 179         return hw_read(ci, OP_USBSTS, ~0);
 180 }
 181
 182 /**
 183  * hw_port_test_set: writes port test mode (execute without interruption)
 184  * @mode: new value
 185  *
 186  * This function returns an error code
 187  */
 188 int hw_port_test_set(struct ci_hdrc *ci, u8 mode)
 189 {
 190         const u8 TEST_MODE_MAX = 7;
 191
 192         if (mode > TEST_MODE_MAX)
 193                 return -EINVAL;
 194
 195         hw_write(ci, OP_PORTSC, PORTSC_PTC, mode << __ffs(PORTSC_PTC));
 196         return 0;
 197 }
 198
 199 /**
 200  * hw_port_test_get: reads port test mode value
 201  *
 202  * @ci: the controller
 203  *
 204  * This function returns port test mode value
 205  */
 206 u8 hw_port_test_get(struct ci_hdrc *ci)
 207 {
 208         return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
 209 }
 210
 211 static void hw_wait_phy_stable(void)
 212 {
 213         /*
 214          * The phy needs some delay to output the stable status from low
 215          * power mode. And for OTGSC, the status inputs are debounced
 216          * using a 1 ms time constant, so, delay 2ms for controller to get
 217          * the stable status, like vbus and id when the phy leaves low power.
 218          */
 219         usleep_range(2000, 2500);
 220 }
 221
 222 /* The PHY enters/leaves low power mode */
 223 static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
 224 {
 225         enum ci_hw_regs reg = ci->hw_bank.lpm ? OP_DEVLC : OP_PORTSC;
 226         bool lpm = !!(hw_read(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm)));
 227
 228         if (enable && !lpm)
 229                 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
 230                                 PORTSC_PHCD(ci->hw_bank.lpm));
 231         else if (!enable && lpm)
 232                 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
 233                                 0);
 234 }
 235
 236 static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
 237 {
 238         u32 reg;
 239
 240         /* bank is a module variable */
 241         ci->hw_bank.abs = base;
 242
 243         ci->hw_bank.cap = ci->hw_bank.abs;
 244         ci->hw_bank.cap += ci->platdata->capoffset;
 245         ci->hw_bank.op = ci->hw_bank.cap + (ioread32(ci->hw_bank.cap) & 0xff);
 246
 247         hw_alloc_regmap(ci, false);
 248         reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
 249                 __ffs(HCCPARAMS_LEN);
 250         ci->hw_bank.lpm  = reg;
 251         if (reg)
 252                 hw_alloc_regmap(ci, !!reg);
 253         ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
 254         ci->hw_bank.size += OP_LAST;
 255         ci->hw_bank.size /= sizeof(u32);
 256
 257         reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
 258                 __ffs(DCCPARAMS_DEN);
 259         ci->hw_ep_max = reg * 2;   /* cache hw ENDPT_MAX */
 260
 261         if (ci->hw_ep_max > ENDPT_MAX)
 262                 return -ENODEV;
 263
 264         ci_hdrc_enter_lpm(ci, false);
 265
 266         /* Disable all interrupts bits */
 267         hw_write(ci, OP_USBINTR, 0xffffffff, 0);
 268
 269         /* Clear all interrupts status bits*/
 270         hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
 271
 272         ci->rev = ci_get_revision(ci);
 273
 274         dev_dbg(ci->dev,
 275                 "ChipIdea HDRC found, revision: %d, lpm: %d; cap: %p op: %p\n",
 276                 ci->rev, ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
 277
 278         /* setup lock mode ? */
 279
 280         /* ENDPTSETUPSTAT is '0' by default */
 281
 282         /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
 283
 284         return 0;
 285 }
 286
 287 void hw_phymode_configure(struct ci_hdrc *ci)
 288 {
 289         u32 portsc, lpm, sts = 0;
 290
 291         switch (ci->platdata->phy_mode) {
 292         case USBPHY_INTERFACE_MODE_UTMI:
 293                 portsc = PORTSC_PTS(PTS_UTMI);
 294                 lpm = DEVLC_PTS(PTS_UTMI);
 295                 break;
 296         case USBPHY_INTERFACE_MODE_UTMIW:
 297                 portsc = PORTSC_PTS(PTS_UTMI) | PORTSC_PTW;
 298                 lpm = DEVLC_PTS(PTS_UTMI) | DEVLC_PTW;
 299                 break;
 300         case USBPHY_INTERFACE_MODE_ULPI:
 301                 portsc = PORTSC_PTS(PTS_ULPI);
 302                 lpm = DEVLC_PTS(PTS_ULPI);
 303                 break;
 304         case USBPHY_INTERFACE_MODE_SERIAL:
 305                 portsc = PORTSC_PTS(PTS_SERIAL);
 306                 lpm = DEVLC_PTS(PTS_SERIAL);
 307                 sts = 1;
 308                 break;
 309         case USBPHY_INTERFACE_MODE_HSIC:
 310                 portsc = PORTSC_PTS(PTS_HSIC);
 311                 lpm = DEVLC_PTS(PTS_HSIC);
 312                 break;
 313         default:
 314                 return;
 315         }
 316
 317         if (ci->hw_bank.lpm) {
 318                 hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
 319                 if (sts)
 320                         hw_write(ci, OP_DEVLC, DEVLC_STS, DEVLC_STS);
 321         } else {
 322                 hw_write(ci, OP_PORTSC, PORTSC_PTS(7) | PORTSC_PTW, portsc);
 323                 if (sts)
 324                         hw_write(ci, OP_PORTSC, PORTSC_STS, PORTSC_STS);
 325         }
 326 }
 327 EXPORT_SYMBOL_GPL(hw_phymode_configure);
 328
 329 /**
 330  * _ci_usb_phy_init: initialize phy taking in account both phy and usb_phy
 331  * interfaces
 332  * @ci: the controller
 333  *
 334  * This function returns an error code if the phy failed to init
 335  */
 336 static int _ci_usb_phy_init(struct ci_hdrc *ci)
 337 {
 338         int ret;
 339
 340         if (ci->phy) {
 341                 ret = phy_init(ci->phy);
 342                 if (ret)
 343                         return ret;
 344
 345                 ret = phy_power_on(ci->phy);
 346                 if (ret) {
 347                         phy_exit(ci->phy);
 348                         return ret;
 349                 }
 350         } else {
 351                 ret = usb_phy_init(ci->usb_phy);
 352         }
 353
 354         return ret;
 355 }
 356
 357 /**
 358  * _ci_usb_phy_exit: deinitialize phy taking in account both phy and usb_phy
 359  * interfaces
 360  * @ci: the controller
 361  */
 362 static void ci_usb_phy_exit(struct ci_hdrc *ci)
 363 {
 364         if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
 365                 return;
 366
 367         if (ci->phy) {
 368                 phy_power_off(ci->phy);
 369                 phy_exit(ci->phy);
 370         } else {
 371                 usb_phy_shutdown(ci->usb_phy);
 372         }
 373 }
 374
 375 /**
 376  * ci_usb_phy_init: initialize phy according to different phy type
 377  * @ci: the controller
 378  *
 379  * This function returns an error code if usb_phy_init has failed
 380  */
 381 static int ci_usb_phy_init(struct ci_hdrc *ci)
 382 {
 383         int ret;
 384
 385         if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
 386                 return 0;
 387
 388         switch (ci->platdata->phy_mode) {
 389         case USBPHY_INTERFACE_MODE_UTMI:
 390         case USBPHY_INTERFACE_MODE_UTMIW:
 391         case USBPHY_INTERFACE_MODE_HSIC:
 392                 ret = _ci_usb_phy_init(ci);
 393                 if (!ret)
 394                         hw_wait_phy_stable();
 395                 else
 396                         return ret;
 397                 hw_phymode_configure(ci);
 398                 break;
 399         case USBPHY_INTERFACE_MODE_ULPI:
 400         case USBPHY_INTERFACE_MODE_SERIAL:
 401                 hw_phymode_configure(ci);
 402                 ret = _ci_usb_phy_init(ci);
 403                 if (ret)
 404                         return ret;
 405                 break;
 406         default:
 407                 ret = _ci_usb_phy_init(ci);
 408                 if (!ret)
 409                         hw_wait_phy_stable();
 410         }
 411
 412         return ret;
 413 }
 414
 415
 416 /**
 417  * ci_platform_configure: do controller configure
 418  * @ci: the controller
 419  *
 420  */
 421 void ci_platform_configure(struct ci_hdrc *ci)
 422 {
 423         bool is_device_mode, is_host_mode;
 424
 425         is_device_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_DC;
 426         is_host_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_HC;
 427
 428         if (is_device_mode) {
 429                 phy_set_mode(ci->phy, PHY_MODE_USB_DEVICE);
 430
 431                 if (ci->platdata->flags & CI_HDRC_DISABLE_DEVICE_STREAMING)
 432                         hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
 433                                  USBMODE_CI_SDIS);
 434         }
 435
 436         if (is_host_mode) {
 437                 phy_set_mode(ci->phy, PHY_MODE_USB_HOST);
 438
 439                 if (ci->platdata->flags & CI_HDRC_DISABLE_HOST_STREAMING)
 440                         hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
 441                                  USBMODE_CI_SDIS);
 442         }
 443
 444         if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) {
 445                 if (ci->hw_bank.lpm)
 446                         hw_write(ci, OP_DEVLC, DEVLC_PFSC, DEVLC_PFSC);
 447                 else
 448                         hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
 449         }
 450
 451         if (ci->platdata->flags & CI_HDRC_SET_NON_ZERO_TTHA)
 452                 hw_write(ci, OP_TTCTRL, TTCTRL_TTHA_MASK, TTCTRL_TTHA);
 453
 454         hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
 455
 456         if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
 457                 hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
 458                         ci->platdata->ahb_burst_config);
 459
 460         /* override burst size, take effect only when ahb_burst_config is 0 */
 461         if (!hw_read_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK)) {
 462                 if (ci->platdata->flags & CI_HDRC_OVERRIDE_TX_BURST)
 463                         hw_write(ci, OP_BURSTSIZE, TX_BURST_MASK,
 464                         ci->platdata->tx_burst_size << __ffs(TX_BURST_MASK));
 465
 466                 if (ci->platdata->flags & CI_HDRC_OVERRIDE_RX_BURST)
 467                         hw_write(ci, OP_BURSTSIZE, RX_BURST_MASK,
 468                                 ci->platdata->rx_burst_size);
 469         }
 470 }
 471
 472 /**
 473  * hw_controller_reset: do controller reset
 474  * @ci: the controller
 475   *
 476  * This function returns an error code
 477  */
 478 static int hw_controller_reset(struct ci_hdrc *ci)
 479 {
 480         int count = 0;
 481
 482         hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
 483         while (hw_read(ci, OP_USBCMD, USBCMD_RST)) {
 484                 udelay(10);
 485                 if (count++ > 1000)
 486                         return -ETIMEDOUT;
 487         }
 488
 489         return 0;
 490 }
 491
 492 /**
 493  * hw_device_reset: resets chip (execute without interruption)
 494  * @ci: the controller
 495  *
 496  * This function returns an error code
 497  */
 498 int hw_device_reset(struct ci_hdrc *ci)
 499 {
 500         int ret;
 501
 502         /* should flush & stop before reset */
 503         hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
 504         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
 505
 506         ret = hw_controller_reset(ci);
 507         if (ret) {
 508                 dev_err(ci->dev, "error resetting controller, ret=%d\n", ret);
 509                 return ret;
 510         }
 511
 512         if (ci->platdata->notify_event) {
 513                 ret = ci->platdata->notify_event(ci,
 514                         CI_HDRC_CONTROLLER_RESET_EVENT);
 515                 if (ret)
 516                         return ret;
 517         }
 518
 519         /* USBMODE should be configured step by step */
 520         hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
 521         hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_DC);
 522         /* HW >= 2.3 */
 523         hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
 524
 525         if (hw_read(ci, OP_USBMODE, USBMODE_CM) != USBMODE_CM_DC) {
 526                 dev_err(ci->dev, "cannot enter in %s device mode\n",
 527                         ci_role(ci)->name);
 528                 dev_err(ci->dev, "lpm = %i\n", ci->hw_bank.lpm);
 529                 return -ENODEV;
 530         }
 531
 532         ci_platform_configure(ci);
 533
 534         return 0;
 535 }
 536
 537 static irqreturn_t ci_irq(int irq, void *data)
 538 {
 539         struct ci_hdrc *ci = data;
 540         irqreturn_t ret = IRQ_NONE;
 541         u32 otgsc = 0;
 542
 543         if (ci->in_lpm) {
 544                 disable_irq_nosync(irq);
 545                 ci->wakeup_int = true;
 546                 pm_runtime_get(ci->dev);
 547                 return IRQ_HANDLED;
 548         }
 549
 550         if (ci->is_otg) {
 551                 otgsc = hw_read_otgsc(ci, ~0);
 552                 if (ci_otg_is_fsm_mode(ci)) {
 553                         ret = ci_otg_fsm_irq(ci);
 554                         if (ret == IRQ_HANDLED)
 555                                 return ret;
 556                 }
 557         }
 558
 559         /*
 560          * Handle id change interrupt, it indicates device/host function
 561          * switch.
 562          */
 563         if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
 564                 ci->id_event = true;
 565                 /* Clear ID change irq status */
 566                 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
 567                 ci_otg_queue_work(ci);
 568                 return IRQ_HANDLED;
 569         }
 570
 571         /*
 572          * Handle vbus change interrupt, it indicates device connection
 573          * and disconnection events.
 574          */
 575         if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
 576                 ci->b_sess_valid_event = true;
 577                 /* Clear BSV irq */
 578                 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
 579                 ci_otg_queue_work(ci);
 580                 return IRQ_HANDLED;
 581         }
 582
 583         /* Handle device/host interrupt */
 584         if (ci->role != CI_ROLE_END)
 585                 ret = ci_role(ci)->irq(ci);
 586
 587         return ret;
 588 }
 589
 590 static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
 591                              void *ptr)
 592 {
 593         struct ci_hdrc_cable *cbl = container_of(nb, struct ci_hdrc_cable, nb);
 594         struct ci_hdrc *ci = cbl->ci;
 595
 596         cbl->connected = event;
 597         cbl->changed = true;
 598
 599         ci_irq(ci->irq, ci);
 600         return NOTIFY_DONE;
 601 }
 602
 603 static enum usb_role ci_usb_role_switch_get(struct device *dev)
 604 {
 605         struct ci_hdrc *ci = dev_get_drvdata(dev);
 606         enum usb_role role;
 607         unsigned long flags;
 608
 609         spin_lock_irqsave(&ci->lock, flags);
 610         role = ci_role_to_usb_role(ci);
 611         spin_unlock_irqrestore(&ci->lock, flags);
 612
 613         return role;
 614 }
 615
 616 static int ci_usb_role_switch_set(struct device *dev, enum usb_role role)
 617 {
 618         struct ci_hdrc *ci = dev_get_drvdata(dev);
 619         struct ci_hdrc_cable *cable = NULL;
 620         enum usb_role current_role = ci_role_to_usb_role(ci);
 621         enum ci_role ci_role = usb_role_to_ci_role(role);
 622         unsigned long flags;
 623
 624         if ((ci_role != CI_ROLE_END && !ci->roles[ci_role]) ||
 625             (current_role == role))
 626                 return 0;
 627
 628         pm_runtime_get_sync(ci->dev);
 629         /* Stop current role */
 630         spin_lock_irqsave(&ci->lock, flags);
 631         if (current_role == USB_ROLE_DEVICE)
 632                 cable = &ci->platdata->vbus_extcon;
 633         else if (current_role == USB_ROLE_HOST)
 634                 cable = &ci->platdata->id_extcon;
 635
 636         if (cable) {
 637                 cable->changed = true;
 638                 cable->connected = false;
 639                 ci_irq(ci->irq, ci);
 640                 spin_unlock_irqrestore(&ci->lock, flags);
 641                 if (ci->wq && role != USB_ROLE_NONE)
 642                         flush_workqueue(ci->wq);
 643                 spin_lock_irqsave(&ci->lock, flags);
 644         }
 645
 646         cable = NULL;
 647
 648         /* Start target role */
 649         if (role == USB_ROLE_DEVICE)
 650                 cable = &ci->platdata->vbus_extcon;
 651         else if (role == USB_ROLE_HOST)
 652                 cable = &ci->platdata->id_extcon;
 653
 654         if (cable) {
 655                 cable->changed = true;
 656                 cable->connected = true;
 657                 ci_irq(ci->irq, ci);
 658         }
 659         spin_unlock_irqrestore(&ci->lock, flags);
 660         pm_runtime_put_sync(ci->dev);
 661
 662         return 0;
 663 }
 664
 665 static struct usb_role_switch_desc ci_role_switch = {
 666         .set = ci_usb_role_switch_set,
 667         .get = ci_usb_role_switch_get,
 668 };
 669
 670 static int ci_get_platdata(struct device *dev,
 671                 struct ci_hdrc_platform_data *platdata)
 672 {
 673         struct extcon_dev *ext_vbus, *ext_id;
 674         struct ci_hdrc_cable *cable;
 675         int ret;
 676
 677         if (!platdata->phy_mode)
 678                 platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
 679
 680         if (!platdata->dr_mode)
 681                 platdata->dr_mode = usb_get_dr_mode(dev);
 682
 683         if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
 684                 platdata->dr_mode = USB_DR_MODE_OTG;
 685
 686         if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
 687                 /* Get the vbus regulator */
 688                 platdata->reg_vbus = devm_regulator_get_optional(dev, "vbus");
 689                 if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
 690                         return -EPROBE_DEFER;
 691                 } else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
 692                         /* no vbus regulator is needed */
 693                         platdata->reg_vbus = NULL;
 694                 } else if (IS_ERR(platdata->reg_vbus)) {
 695                         dev_err(dev, "Getting regulator error: %ld\n",
 696                                 PTR_ERR(platdata->reg_vbus));
 697                         return PTR_ERR(platdata->reg_vbus);
 698                 }
 699                 /* Get TPL support */
 700                 if (!platdata->tpl_support)
 701                         platdata->tpl_support =
 702                                 of_usb_host_tpl_support(dev->of_node);
 703         }
 704
 705         if (platdata->dr_mode == USB_DR_MODE_OTG) {
 706                 /* We can support HNP and SRP of OTG 2.0 */
 707                 platdata->ci_otg_caps.otg_rev = 0x0200;
 708                 platdata->ci_otg_caps.hnp_support = true;
 709                 platdata->ci_otg_caps.srp_support = true;
 710
 711                 /* Update otg capabilities by DT properties */
 712                 ret = of_usb_update_otg_caps(dev->of_node,
 713                                         &platdata->ci_otg_caps);
 714                 if (ret)
 715                         return ret;
 716         }
 717
 718         if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
 719                 platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
 720
 721         of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
 722                                      &platdata->phy_clkgate_delay_us);
 723
 724         platdata->itc_setting = 1;
 725
 726         of_property_read_u32(dev->of_node, "itc-setting",
 727                                         &platdata->itc_setting);
 728
 729         ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
 730                                 &platdata->ahb_burst_config);
 731         if (!ret) {
 732                 platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
 733         } else if (ret != -EINVAL) {
 734                 dev_err(dev, "failed to get ahb-burst-config\n");
 735                 return ret;
 736         }
 737
 738         ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
 739                                 &platdata->tx_burst_size);
 740         if (!ret) {
 741                 platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
 742         } else if (ret != -EINVAL) {
 743                 dev_err(dev, "failed to get tx-burst-size-dword\n");
 744                 return ret;
 745         }
 746
 747         ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
 748                                 &platdata->rx_burst_size);
 749         if (!ret) {
 750                 platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
 751         } else if (ret != -EINVAL) {
 752                 dev_err(dev, "failed to get rx-burst-size-dword\n");
 753                 return ret;
 754         }
 755
 756         if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL))
 757                 platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
 758
 759         ext_id = ERR_PTR(-ENODEV);
 760         ext_vbus = ERR_PTR(-ENODEV);
 761         if (of_property_read_bool(dev->of_node, "extcon")) {
 762                 /* Each one of them is not mandatory */
 763                 ext_vbus = extcon_get_edev_by_phandle(dev, 0);
 764                 if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
 765                         return PTR_ERR(ext_vbus);
 766
 767                 ext_id = extcon_get_edev_by_phandle(dev, 1);
 768                 if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
 769                         return PTR_ERR(ext_id);
 770         }
 771
 772         cable = &platdata->vbus_extcon;
 773         cable->nb.notifier_call = ci_cable_notifier;
 774         cable->edev = ext_vbus;
 775
 776         if (!IS_ERR(ext_vbus)) {
 777                 ret = extcon_get_state(cable->edev, EXTCON_USB);
 778                 if (ret)
 779                         cable->connected = true;
 780                 else
 781                         cable->connected = false;
 782         }
 783
 784         cable = &platdata->id_extcon;
 785         cable->nb.notifier_call = ci_cable_notifier;
 786         cable->edev = ext_id;
 787
 788         if (!IS_ERR(ext_id)) {
 789                 ret = extcon_get_state(cable->edev, EXTCON_USB_HOST);
 790                 if (ret)
 791                         cable->connected = true;
 792                 else
 793                         cable->connected = false;
 794         }
 795
 796         if (device_property_read_bool(dev, "usb-role-switch"))
 797                 ci_role_switch.fwnode = dev->fwnode;
 798
 799         platdata->pctl = devm_pinctrl_get(dev);
 800         if (!IS_ERR(platdata->pctl)) {
 801                 struct pinctrl_state *p;
 802
 803                 p = pinctrl_lookup_state(platdata->pctl, "default");
 804                 if (!IS_ERR(p))
 805                         platdata->pins_default = p;
 806
 807                 p = pinctrl_lookup_state(platdata->pctl, "host");
 808                 if (!IS_ERR(p))
 809                         platdata->pins_host = p;
 810
 811                 p = pinctrl_lookup_state(platdata->pctl, "device");
 812                 if (!IS_ERR(p))
 813                         platdata->pins_device = p;
 814         }
 815
 816         return 0;
 817 }
 818
 819 static int ci_extcon_register(struct ci_hdrc *ci)
 820 {
 821         struct ci_hdrc_cable *id, *vbus;
 822         int ret;
 823
 824         id = &ci->platdata->id_extcon;
 825         id->ci = ci;
 826         if (!IS_ERR_OR_NULL(id->edev)) {
 827                 ret = devm_extcon_register_notifier(ci->dev, id->edev,
 828                                                 EXTCON_USB_HOST, &id->nb);
 829                 if (ret < 0) {
 830                         dev_err(ci->dev, "register ID failed\n");
 831                         return ret;
 832                 }
 833         }
 834
 835         vbus = &ci->platdata->vbus_extcon;
 836         vbus->ci = ci;
 837         if (!IS_ERR_OR_NULL(vbus->edev)) {
 838                 ret = devm_extcon_register_notifier(ci->dev, vbus->edev,
 839                                                 EXTCON_USB, &vbus->nb);
 840                 if (ret < 0) {
 841                         dev_err(ci->dev, "register VBUS failed\n");
 842                         return ret;
 843                 }
 844         }
 845
 846         return 0;
 847 }
 848
 849 static DEFINE_IDA(ci_ida);
 850
 851 struct platform_device *ci_hdrc_add_device(struct device *dev,
 852                         struct resource *res, int nres,
 853                         struct ci_hdrc_platform_data *platdata)
 854 {
 855         struct platform_device *pdev;
 856         int id, ret;
 857
 858         ret = ci_get_platdata(dev, platdata);
 859         if (ret)
 860                 return ERR_PTR(ret);
 861
 862         id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
 863         if (id < 0)
 864                 return ERR_PTR(id);
 865
 866         pdev = platform_device_alloc("ci_hdrc", id);
 867         if (!pdev) {
 868                 ret = -ENOMEM;
 869                 goto put_id;
 870         }
 871
 872         pdev->dev.parent = dev;
 873
 874         ret = platform_device_add_resources(pdev, res, nres);
 875         if (ret)
 876                 goto err;
 877
 878         ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
 879         if (ret)
 880                 goto err;
 881
 882         ret = platform_device_add(pdev);
 883         if (ret)
 884                 goto err;
 885
 886         return pdev;
 887
 888 err:
 889         platform_device_put(pdev);
 890 put_id:
 891         ida_simple_remove(&ci_ida, id);
 892         return ERR_PTR(ret);
 893 }
 894 EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
 895
 896 void ci_hdrc_remove_device(struct platform_device *pdev)
 897 {
 898         int id = pdev->id;
 899         platform_device_unregister(pdev);
 900         ida_simple_remove(&ci_ida, id);
 901 }
 902 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
 903
 904 static inline void ci_role_destroy(struct ci_hdrc *ci)
 905 {
 906         ci_hdrc_gadget_destroy(ci);
 907         ci_hdrc_host_destroy(ci);
 908         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
 909                 ci_hdrc_otg_destroy(ci);
 910 }
 911
 912 static void ci_get_otg_capable(struct ci_hdrc *ci)
 913 {
 914         if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
 915                 ci->is_otg = false;
 916         else
 917                 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
 918                                 DCCPARAMS_DC | DCCPARAMS_HC)
 919                                         == (DCCPARAMS_DC | DCCPARAMS_HC));
 920         if (ci->is_otg) {
 921                 dev_dbg(ci->dev, "It is OTG capable controller\n");
 922                 /* Disable and clear all OTG irq */
 923                 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
 924                                                         OTGSC_INT_STATUS_BITS);
 925         }
 926 }
 927
 928 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
 929                           char *buf)
 930 {
 931         struct ci_hdrc *ci = dev_get_drvdata(dev);
 932
 933         if (ci->role != CI_ROLE_END)
 934                 return sprintf(buf, "%s\n", ci_role(ci)->name);
 935
 936         return 0;
 937 }
 938
 939 static ssize_t role_store(struct device *dev,
 940                 struct device_attribute *attr, const char *buf, size_t n)
 941 {
 942         struct ci_hdrc *ci = dev_get_drvdata(dev);
 943         enum ci_role role;
 944         int ret;
 945
 946         if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
 947                 dev_warn(dev, "Current configuration is not dual-role, quit\n");
 948                 return -EPERM;
 949         }
 950
 951         for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
 952                 if (!strncmp(buf, ci->roles[role]->name,
 953                              strlen(ci->roles[role]->name)))
 954                         break;
 955
 956         if (role == CI_ROLE_END || role == ci->role)
 957                 return -EINVAL;
 958
 959         pm_runtime_get_sync(dev);
 960         disable_irq(ci->irq);
 961         ci_role_stop(ci);
 962         ret = ci_role_start(ci, role);
 963         if (!ret && ci->role == CI_ROLE_GADGET)
 964                 ci_handle_vbus_change(ci);
 965         enable_irq(ci->irq);
 966         pm_runtime_put_sync(dev);
 967
 968         return (ret == 0) ? n : ret;
 969 }
 970 static DEVICE_ATTR_RW(role);
 971
 972 static struct attribute *ci_attrs[] = {
 973         &dev_attr_role.attr,
 974         NULL,
 975 };
 976 ATTRIBUTE_GROUPS(ci);
 977
 978 static int ci_hdrc_probe(struct platform_device *pdev)
 979 {
 980         struct device   *dev = &pdev->dev;
 981         struct ci_hdrc  *ci;
 982         struct resource *res;
 983         void __iomem    *base;
 984         int             ret;
 985         enum usb_dr_mode dr_mode;
 986
 987         if (!dev_get_platdata(dev)) {
 988                 dev_err(dev, "platform data missing\n");
 989                 return -ENODEV;
 990         }
 991
 992         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 993         base = devm_ioremap_resource(dev, res);
 994         if (IS_ERR(base))
 995                 return PTR_ERR(base);
 996
 997         ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
 998         if (!ci)
 999                 return -ENOMEM;
1000
1001         spin_lock_init(&ci->lock);
1002         ci->dev = dev;
1003         ci->platdata = dev_get_platdata(dev);
1004         ci->imx28_write_fix = !!(ci->platdata->flags &
1005                 CI_HDRC_IMX28_WRITE_FIX);
1006         ci->supports_runtime_pm = !!(ci->platdata->flags &
1007                 CI_HDRC_SUPPORTS_RUNTIME_PM);
1008         platform_set_drvdata(pdev, ci);
1009
1010         ret = hw_device_init(ci, base);
1011         if (ret < 0) {
1012                 dev_err(dev, "can't initialize hardware\n");
1013                 return -ENODEV;
1014         }
1015
1016         ret = ci_ulpi_init(ci);
1017         if (ret)
1018                 return ret;
1019
1020         if (ci->platdata->phy) {
1021                 ci->phy = ci->platdata->phy;
1022         } else if (ci->platdata->usb_phy) {
1023                 ci->usb_phy = ci->platdata->usb_phy;
1024         } else {
1025                 /* Look for a generic PHY first */
1026                 ci->phy = devm_phy_get(dev->parent, "usb-phy");
1027
1028                 if (PTR_ERR(ci->phy) == -EPROBE_DEFER) {
1029                         ret = -EPROBE_DEFER;
1030                         goto ulpi_exit;
1031                 } else if (IS_ERR(ci->phy)) {
1032                         ci->phy = NULL;
1033                 }
1034
1035                 /* Look for a legacy USB PHY from device-tree next */
1036                 if (!ci->phy) {
1037                         ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent,
1038                                                                   "phys", 0);
1039
1040                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1041                                 ret = -EPROBE_DEFER;
1042                                 goto ulpi_exit;
1043                         } else if (IS_ERR(ci->usb_phy)) {
1044                                 ci->usb_phy = NULL;
1045                         }
1046                 }
1047
1048                 /* Look for any registered legacy USB PHY as last resort */
1049                 if (!ci->phy && !ci->usb_phy) {
1050                         ci->usb_phy = devm_usb_get_phy(dev->parent,
1051                                                        USB_PHY_TYPE_USB2);
1052
1053                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1054                                 ret = -EPROBE_DEFER;
1055                                 goto ulpi_exit;
1056                         } else if (IS_ERR(ci->usb_phy)) {
1057                                 ci->usb_phy = NULL;
1058                         }
1059                 }
1060
1061                 /* No USB PHY was found in the end */
1062                 if (!ci->phy && !ci->usb_phy) {
1063                         ret = -ENXIO;
1064                         goto ulpi_exit;
1065                 }
1066         }
1067
1068         ret = ci_usb_phy_init(ci);
1069         if (ret) {
1070                 dev_err(dev, "unable to init phy: %d\n", ret);
1071                 return ret;
1072         }
1073
1074         ci->hw_bank.phys = res->start;
1075
1076         ci->irq = platform_get_irq(pdev, 0);
1077         if (ci->irq < 0) {
1078                 ret = ci->irq;
1079                 goto deinit_phy;
1080         }
1081
1082         ci_get_otg_capable(ci);
1083
1084         dr_mode = ci->platdata->dr_mode;
1085         /* initialize role(s) before the interrupt is requested */
1086         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
1087                 ret = ci_hdrc_host_init(ci);
1088                 if (ret) {
1089                         if (ret == -ENXIO)
1090                                 dev_info(dev, "doesn't support host\n");
1091                         else
1092                                 goto deinit_phy;
1093                 }
1094         }
1095
1096         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
1097                 ret = ci_hdrc_gadget_init(ci);
1098                 if (ret) {
1099                         if (ret == -ENXIO)
1100                                 dev_info(dev, "doesn't support gadget\n");
1101                         else
1102                                 goto deinit_host;
1103                 }
1104         }
1105
1106         if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
1107                 dev_err(dev, "no supported roles\n");
1108                 ret = -ENODEV;
1109                 goto deinit_gadget;
1110         }
1111
1112         if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
1113                 ret = ci_hdrc_otg_init(ci);
1114                 if (ret) {
1115                         dev_err(dev, "init otg fails, ret = %d\n", ret);
1116                         goto deinit_gadget;
1117                 }
1118         }
1119
1120         if (ci_role_switch.fwnode) {
1121                 ci->role_switch = usb_role_switch_register(dev,
1122                                         &ci_role_switch);
1123                 if (IS_ERR(ci->role_switch)) {
1124                         ret = PTR_ERR(ci->role_switch);
1125                         goto deinit_otg;
1126                 }
1127         }
1128
1129         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
1130                 if (ci->is_otg) {
1131                         ci->role = ci_otg_role(ci);
1132                         /* Enable ID change irq */
1133                         hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
1134                 } else {
1135                         /*
1136                          * If the controller is not OTG capable, but support
1137                          * role switch, the defalt role is gadget, and the
1138                          * user can switch it through debugfs.
1139                          */
1140                         ci->role = CI_ROLE_GADGET;
1141                 }
1142         } else {
1143                 ci->role = ci->roles[CI_ROLE_HOST]
1144                         ? CI_ROLE_HOST
1145                         : CI_ROLE_GADGET;
1146         }
1147
1148         if (!ci_otg_is_fsm_mode(ci)) {
1149                 /* only update vbus status for peripheral */
1150                 if (ci->role == CI_ROLE_GADGET)
1151                         ci_handle_vbus_change(ci);
1152
1153                 ret = ci_role_start(ci, ci->role);
1154                 if (ret) {
1155                         dev_err(dev, "can't start %s role\n",
1156                                                 ci_role(ci)->name);
1157                         goto stop;
1158                 }
1159         }
1160
1161         ret = devm_request_irq(dev, ci->irq, ci_irq, IRQF_SHARED,
1162                         ci->platdata->name, ci);
1163         if (ret)
1164                 goto stop;
1165
1166         ret = ci_extcon_register(ci);
1167         if (ret)
1168                 goto stop;
1169
1170         if (ci->supports_runtime_pm) {
1171                 pm_runtime_set_active(&pdev->dev);
1172                 pm_runtime_enable(&pdev->dev);
1173                 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
1174                 pm_runtime_mark_last_busy(ci->dev);
1175                 pm_runtime_use_autosuspend(&pdev->dev);
1176         }
1177
1178         if (ci_otg_is_fsm_mode(ci))
1179                 ci_hdrc_otg_fsm_start(ci);
1180
1181         device_set_wakeup_capable(&pdev->dev, true);
1182         dbg_create_files(ci);
1183
1184         return 0;
1185
1186 stop:
1187         if (ci->role_switch)
1188                 usb_role_switch_unregister(ci->role_switch);
1189 deinit_otg:
1190         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
1191                 ci_hdrc_otg_destroy(ci);
1192 deinit_gadget:
1193         ci_hdrc_gadget_destroy(ci);
1194 deinit_host:
1195         ci_hdrc_host_destroy(ci);
1196 deinit_phy:
1197         ci_usb_phy_exit(ci);
1198 ulpi_exit:
1199         ci_ulpi_exit(ci);
1200
1201         return ret;
1202 }
1203
1204 static int ci_hdrc_remove(struct platform_device *pdev)
1205 {
1206         struct ci_hdrc *ci = platform_get_drvdata(pdev);
1207
1208         if (ci->role_switch)
1209                 usb_role_switch_unregister(ci->role_switch);
1210
1211         if (ci->supports_runtime_pm) {
1212                 pm_runtime_get_sync(&pdev->dev);
1213                 pm_runtime_disable(&pdev->dev);
1214                 pm_runtime_put_noidle(&pdev->dev);
1215         }
1216
1217         dbg_remove_files(ci);
1218         ci_role_destroy(ci);
1219         ci_hdrc_enter_lpm(ci, true);
1220         ci_usb_phy_exit(ci);
1221         ci_ulpi_exit(ci);
1222
1223         return 0;
1224 }
1225
1226 #ifdef CONFIG_PM
1227 /* Prepare wakeup by SRP before suspend */
1228 static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
1229 {
1230         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1231                                 !hw_read_otgsc(ci, OTGSC_ID)) {
1232                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
1233                                                                 PORTSC_PP);
1234                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
1235                                                                 PORTSC_WKCN);
1236         }
1237 }
1238
1239 /* Handle SRP when wakeup by data pulse */
1240 static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
1241 {
1242         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1243                 (ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
1244                 if (!hw_read_otgsc(ci, OTGSC_ID)) {
1245                         ci->fsm.a_srp_det = 1;
1246                         ci->fsm.a_bus_drop = 0;
1247                 } else {
1248                         ci->fsm.id = 1;
1249                 }
1250                 ci_otg_queue_work(ci);
1251         }
1252 }
1253
1254 static void ci_controller_suspend(struct ci_hdrc *ci)
1255 {
1256         disable_irq(ci->irq);
1257         ci_hdrc_enter_lpm(ci, true);
1258         if (ci->platdata->phy_clkgate_delay_us)
1259                 usleep_range(ci->platdata->phy_clkgate_delay_us,
1260                              ci->platdata->phy_clkgate_delay_us + 50);
1261         usb_phy_set_suspend(ci->usb_phy, 1);
1262         ci->in_lpm = true;
1263         enable_irq(ci->irq);
1264 }
1265
1266 static int ci_controller_resume(struct device *dev)
1267 {
1268         struct ci_hdrc *ci = dev_get_drvdata(dev);
1269         int ret;
1270
1271         dev_dbg(dev, "at %s\n", __func__);
1272
1273         if (!ci->in_lpm) {
1274                 WARN_ON(1);
1275                 return 0;
1276         }
1277
1278         ci_hdrc_enter_lpm(ci, false);
1279
1280         ret = ci_ulpi_resume(ci);
1281         if (ret)
1282                 return ret;
1283
1284         if (ci->usb_phy) {
1285                 usb_phy_set_suspend(ci->usb_phy, 0);
1286                 usb_phy_set_wakeup(ci->usb_phy, false);
1287                 hw_wait_phy_stable();
1288         }
1289
1290         ci->in_lpm = false;
1291         if (ci->wakeup_int) {
1292                 ci->wakeup_int = false;
1293                 pm_runtime_mark_last_busy(ci->dev);
1294                 pm_runtime_put_autosuspend(ci->dev);
1295                 enable_irq(ci->irq);
1296                 if (ci_otg_is_fsm_mode(ci))
1297                         ci_otg_fsm_wakeup_by_srp(ci);
1298         }
1299
1300         return 0;
1301 }
1302
1303 #ifdef CONFIG_PM_SLEEP
1304 static int ci_suspend(struct device *dev)
1305 {
1306         struct ci_hdrc *ci = dev_get_drvdata(dev);
1307
1308         if (ci->wq)
1309                 flush_workqueue(ci->wq);
1310         /*
1311          * Controller needs to be active during suspend, otherwise the core
1312          * may run resume when the parent is at suspend if other driver's
1313          * suspend fails, it occurs before parent's suspend has not started,
1314          * but the core suspend has finished.
1315          */
1316         if (ci->in_lpm)
1317                 pm_runtime_resume(dev);
1318
1319         if (ci->in_lpm) {
1320                 WARN_ON(1);
1321                 return 0;
1322         }
1323
1324         if (device_may_wakeup(dev)) {
1325                 if (ci_otg_is_fsm_mode(ci))
1326                         ci_otg_fsm_suspend_for_srp(ci);
1327
1328                 usb_phy_set_wakeup(ci->usb_phy, true);
1329                 enable_irq_wake(ci->irq);
1330         }
1331
1332         ci_controller_suspend(ci);
1333
1334         return 0;
1335 }
1336
1337 static int ci_resume(struct device *dev)
1338 {
1339         struct ci_hdrc *ci = dev_get_drvdata(dev);
1340         int ret;
1341
1342         if (device_may_wakeup(dev))
1343                 disable_irq_wake(ci->irq);
1344
1345         ret = ci_controller_resume(dev);
1346         if (ret)
1347                 return ret;
1348
1349         if (ci->supports_runtime_pm) {
1350                 pm_runtime_disable(dev);
1351                 pm_runtime_set_active(dev);
1352                 pm_runtime_enable(dev);
1353         }
1354
1355         return ret;
1356 }
1357 #endif /* CONFIG_PM_SLEEP */
1358
1359 static int ci_runtime_suspend(struct device *dev)
1360 {
1361         struct ci_hdrc *ci = dev_get_drvdata(dev);
1362
1363         dev_dbg(dev, "at %s\n", __func__);
1364
1365         if (ci->in_lpm) {
1366                 WARN_ON(1);
1367                 return 0;
1368         }
1369
1370         if (ci_otg_is_fsm_mode(ci))
1371                 ci_otg_fsm_suspend_for_srp(ci);
1372
1373         usb_phy_set_wakeup(ci->usb_phy, true);
1374         ci_controller_suspend(ci);
1375
1376         return 0;
1377 }
1378
1379 static int ci_runtime_resume(struct device *dev)
1380 {
1381         return ci_controller_resume(dev);
1382 }
1383
1384 #endif /* CONFIG_PM */
1385 static const struct dev_pm_ops ci_pm_ops = {
1386         SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
1387         SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
1388 };
1389
1390 static struct platform_driver ci_hdrc_driver = {
1391         .probe  = ci_hdrc_probe,
1392         .remove = ci_hdrc_remove,
1393         .driver = {
1394                 .name   = "ci_hdrc",
1395                 .pm     = &ci_pm_ops,
1396                 .dev_groups = ci_groups,
1397         },
1398 };
1399
1400 static int __init ci_hdrc_platform_register(void)
1401 {
1402         ci_hdrc_host_driver_init();
1403         return platform_driver_register(&ci_hdrc_driver);
1404 }
1405 module_init(ci_hdrc_platform_register);
1406
1407 static void __exit ci_hdrc_platform_unregister(void)
1408 {
1409         platform_driver_unregister(&ci_hdrc_driver);
1410 }
1411 module_exit(ci_hdrc_platform_unregister);
1412
1413 MODULE_ALIAS("platform:ci_hdrc");
1414 MODULE_LICENSE("GPL v2");
1415 MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
1416 MODULE_DESCRIPTION("ChipIdea HDRC Driver");