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_FRINDEX]            = 0x0CU,
  57         [OP_DEVICEADDR]         = 0x14U,
  58         [OP_ENDPTLISTADDR]      = 0x18U,
  59         [OP_TTCTRL]             = 0x1CU,
  60         [OP_BURSTSIZE]          = 0x20U,
  61         [OP_ULPI_VIEWPORT]      = 0x30U,
  62         [OP_PORTSC]             = 0x44U,
  63         [OP_DEVLC]              = 0x84U,
  64         [OP_OTGSC]              = 0x64U,
  65         [OP_USBMODE]            = 0x68U,
  66         [OP_ENDPTSETUPSTAT]     = 0x6CU,
  67         [OP_ENDPTPRIME]         = 0x70U,
  68         [OP_ENDPTFLUSH]         = 0x74U,
  69         [OP_ENDPTSTAT]          = 0x78U,
  70         [OP_ENDPTCOMPLETE]      = 0x7CU,
  71         [OP_ENDPTCTRL]          = 0x80U,
  72 };
  73
  74 static const u8 ci_regs_lpm[] = {
  75         [CAP_CAPLENGTH]         = 0x00U,
  76         [CAP_HCCPARAMS]         = 0x08U,
  77         [CAP_DCCPARAMS]         = 0x24U,
  78         [CAP_TESTMODE]          = 0xFCU,
  79         [OP_USBCMD]             = 0x00U,
  80         [OP_USBSTS]             = 0x04U,
  81         [OP_USBINTR]            = 0x08U,
  82         [OP_FRINDEX]            = 0x0CU,
  83         [OP_DEVICEADDR]         = 0x14U,
  84         [OP_ENDPTLISTADDR]      = 0x18U,
  85         [OP_TTCTRL]             = 0x1CU,
  86         [OP_BURSTSIZE]          = 0x20U,
  87         [OP_ULPI_VIEWPORT]      = 0x30U,
  88         [OP_PORTSC]             = 0x44U,
  89         [OP_DEVLC]              = 0x84U,
  90         [OP_OTGSC]              = 0xC4U,
  91         [OP_USBMODE]            = 0xC8U,
  92         [OP_ENDPTSETUPSTAT]     = 0xD8U,
  93         [OP_ENDPTPRIME]         = 0xDCU,
  94         [OP_ENDPTFLUSH]         = 0xE0U,
  95         [OP_ENDPTSTAT]          = 0xE4U,
  96         [OP_ENDPTCOMPLETE]      = 0xE8U,
  97         [OP_ENDPTCTRL]          = 0xECU,
  98 };
  99
 100 static void hw_alloc_regmap(struct ci_hdrc *ci, bool is_lpm)
 101 {
 102         int i;
 103
 104         for (i = 0; i < OP_ENDPTCTRL; i++)
 105                 ci->hw_bank.regmap[i] =
 106                         (i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
 107                         (is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
 108
 109         for (; i <= OP_LAST; i++)
 110                 ci->hw_bank.regmap[i] = ci->hw_bank.op +
 111                         4 * (i - OP_ENDPTCTRL) +
 112                         (is_lpm
 113                          ? ci_regs_lpm[OP_ENDPTCTRL]
 114                          : ci_regs_nolpm[OP_ENDPTCTRL]);
 115
 116 }
 117
 118 static enum ci_revision ci_get_revision(struct ci_hdrc *ci)
 119 {
 120         int ver = hw_read_id_reg(ci, ID_ID, VERSION) >> __ffs(VERSION);
 121         enum ci_revision rev = CI_REVISION_UNKNOWN;
 122
 123         if (ver == 0x2) {
 124                 rev = hw_read_id_reg(ci, ID_ID, REVISION)
 125                         >> __ffs(REVISION);
 126                 rev += CI_REVISION_20;
 127         } else if (ver == 0x0) {
 128                 rev = CI_REVISION_1X;
 129         }
 130
 131         return rev;
 132 }
 133
 134 /**
 135  * hw_read_intr_enable: returns interrupt enable register
 136  *
 137  * @ci: the controller
 138  *
 139  * This function returns register data
 140  */
 141 u32 hw_read_intr_enable(struct ci_hdrc *ci)
 142 {
 143         return hw_read(ci, OP_USBINTR, ~0);
 144 }
 145
 146 /**
 147  * hw_read_intr_status: returns interrupt status register
 148  *
 149  * @ci: the controller
 150  *
 151  * This function returns register data
 152  */
 153 u32 hw_read_intr_status(struct ci_hdrc *ci)
 154 {
 155         return hw_read(ci, OP_USBSTS, ~0);
 156 }
 157
 158 /**
 159  * hw_port_test_set: writes port test mode (execute without interruption)
 160  * @ci: the controller
 161  * @mode: new value
 162  *
 163  * This function returns an error code
 164  */
 165 int hw_port_test_set(struct ci_hdrc *ci, u8 mode)
 166 {
 167         const u8 TEST_MODE_MAX = 7;
 168
 169         if (mode > TEST_MODE_MAX)
 170                 return -EINVAL;
 171
 172         hw_write(ci, OP_PORTSC, PORTSC_PTC, mode << __ffs(PORTSC_PTC));
 173         return 0;
 174 }
 175
 176 /**
 177  * hw_port_test_get: reads port test mode value
 178  *
 179  * @ci: the controller
 180  *
 181  * This function returns port test mode value
 182  */
 183 u8 hw_port_test_get(struct ci_hdrc *ci)
 184 {
 185         return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
 186 }
 187
 188 static void hw_wait_phy_stable(void)
 189 {
 190         /*
 191          * The phy needs some delay to output the stable status from low
 192          * power mode. And for OTGSC, the status inputs are debounced
 193          * using a 1 ms time constant, so, delay 2ms for controller to get
 194          * the stable status, like vbus and id when the phy leaves low power.
 195          */
 196         usleep_range(2000, 2500);
 197 }
 198
 199 /* The PHY enters/leaves low power mode */
 200 static void ci_hdrc_enter_lpm_common(struct ci_hdrc *ci, bool enable)
 201 {
 202         enum ci_hw_regs reg = ci->hw_bank.lpm ? OP_DEVLC : OP_PORTSC;
 203         bool lpm = !!(hw_read(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm)));
 204
 205         if (enable && !lpm)
 206                 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
 207                                 PORTSC_PHCD(ci->hw_bank.lpm));
 208         else if (!enable && lpm)
 209                 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
 210                                 0);
 211 }
 212
 213 static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
 214 {
 215         return ci->platdata->enter_lpm(ci, enable);
 216 }
 217
 218 static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
 219 {
 220         u32 reg;
 221
 222         /* bank is a module variable */
 223         ci->hw_bank.abs = base;
 224
 225         ci->hw_bank.cap = ci->hw_bank.abs;
 226         ci->hw_bank.cap += ci->platdata->capoffset;
 227         ci->hw_bank.op = ci->hw_bank.cap + (ioread32(ci->hw_bank.cap) & 0xff);
 228
 229         hw_alloc_regmap(ci, false);
 230         reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
 231                 __ffs(HCCPARAMS_LEN);
 232         ci->hw_bank.lpm  = reg;
 233         if (reg)
 234                 hw_alloc_regmap(ci, !!reg);
 235         ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
 236         ci->hw_bank.size += OP_LAST;
 237         ci->hw_bank.size /= sizeof(u32);
 238
 239         reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
 240                 __ffs(DCCPARAMS_DEN);
 241         ci->hw_ep_max = reg * 2;   /* cache hw ENDPT_MAX */
 242
 243         if (ci->hw_ep_max > ENDPT_MAX)
 244                 return -ENODEV;
 245
 246         ci_hdrc_enter_lpm(ci, false);
 247
 248         /* Disable all interrupts bits */
 249         hw_write(ci, OP_USBINTR, 0xffffffff, 0);
 250
 251         /* Clear all interrupts status bits*/
 252         hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
 253
 254         ci->rev = ci_get_revision(ci);
 255
 256         dev_dbg(ci->dev,
 257                 "revision: %d, lpm: %d; cap: %px op: %px\n",
 258                 ci->rev, ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
 259
 260         /* setup lock mode ? */
 261
 262         /* ENDPTSETUPSTAT is '0' by default */
 263
 264         /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
 265
 266         return 0;
 267 }
 268
 269 void hw_phymode_configure(struct ci_hdrc *ci)
 270 {
 271         u32 portsc, lpm, sts = 0;
 272
 273         switch (ci->platdata->phy_mode) {
 274         case USBPHY_INTERFACE_MODE_UTMI:
 275                 portsc = PORTSC_PTS(PTS_UTMI);
 276                 lpm = DEVLC_PTS(PTS_UTMI);
 277                 break;
 278         case USBPHY_INTERFACE_MODE_UTMIW:
 279                 portsc = PORTSC_PTS(PTS_UTMI) | PORTSC_PTW;
 280                 lpm = DEVLC_PTS(PTS_UTMI) | DEVLC_PTW;
 281                 break;
 282         case USBPHY_INTERFACE_MODE_ULPI:
 283                 portsc = PORTSC_PTS(PTS_ULPI);
 284                 lpm = DEVLC_PTS(PTS_ULPI);
 285                 break;
 286         case USBPHY_INTERFACE_MODE_SERIAL:
 287                 portsc = PORTSC_PTS(PTS_SERIAL);
 288                 lpm = DEVLC_PTS(PTS_SERIAL);
 289                 sts = 1;
 290                 break;
 291         case USBPHY_INTERFACE_MODE_HSIC:
 292                 portsc = PORTSC_PTS(PTS_HSIC);
 293                 lpm = DEVLC_PTS(PTS_HSIC);
 294                 break;
 295         default:
 296                 return;
 297         }
 298
 299         if (ci->hw_bank.lpm) {
 300                 hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
 301                 if (sts)
 302                         hw_write(ci, OP_DEVLC, DEVLC_STS, DEVLC_STS);
 303         } else {
 304                 hw_write(ci, OP_PORTSC, PORTSC_PTS(7) | PORTSC_PTW, portsc);
 305                 if (sts)
 306                         hw_write(ci, OP_PORTSC, PORTSC_STS, PORTSC_STS);
 307         }
 308 }
 309 EXPORT_SYMBOL_GPL(hw_phymode_configure);
 310
 311 /**
 312  * _ci_usb_phy_init: initialize phy taking in account both phy and usb_phy
 313  * interfaces
 314  * @ci: the controller
 315  *
 316  * This function returns an error code if the phy failed to init
 317  */
 318 static int _ci_usb_phy_init(struct ci_hdrc *ci)
 319 {
 320         int ret;
 321
 322         if (ci->phy) {
 323                 ret = phy_init(ci->phy);
 324                 if (ret)
 325                         return ret;
 326
 327                 ret = phy_power_on(ci->phy);
 328                 if (ret) {
 329                         phy_exit(ci->phy);
 330                         return ret;
 331                 }
 332         } else {
 333                 ret = usb_phy_init(ci->usb_phy);
 334         }
 335
 336         return ret;
 337 }
 338
 339 /**
 340  * ci_usb_phy_exit: deinitialize phy taking in account both phy and usb_phy
 341  * interfaces
 342  * @ci: the controller
 343  */
 344 static void ci_usb_phy_exit(struct ci_hdrc *ci)
 345 {
 346         if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
 347                 return;
 348
 349         if (ci->phy) {
 350                 phy_power_off(ci->phy);
 351                 phy_exit(ci->phy);
 352         } else {
 353                 usb_phy_shutdown(ci->usb_phy);
 354         }
 355 }
 356
 357 /**
 358  * ci_usb_phy_init: initialize phy according to different phy type
 359  * @ci: the controller
 360  *
 361  * This function returns an error code if usb_phy_init has failed
 362  */
 363 static int ci_usb_phy_init(struct ci_hdrc *ci)
 364 {
 365         int ret;
 366
 367         if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
 368                 return 0;
 369
 370         switch (ci->platdata->phy_mode) {
 371         case USBPHY_INTERFACE_MODE_UTMI:
 372         case USBPHY_INTERFACE_MODE_UTMIW:
 373         case USBPHY_INTERFACE_MODE_HSIC:
 374                 ret = _ci_usb_phy_init(ci);
 375                 if (!ret)
 376                         hw_wait_phy_stable();
 377                 else
 378                         return ret;
 379                 hw_phymode_configure(ci);
 380                 break;
 381         case USBPHY_INTERFACE_MODE_ULPI:
 382         case USBPHY_INTERFACE_MODE_SERIAL:
 383                 hw_phymode_configure(ci);
 384                 ret = _ci_usb_phy_init(ci);
 385                 if (ret)
 386                         return ret;
 387                 break;
 388         default:
 389                 ret = _ci_usb_phy_init(ci);
 390                 if (!ret)
 391                         hw_wait_phy_stable();
 392         }
 393
 394         return ret;
 395 }
 396
 397
 398 /**
 399  * ci_platform_configure: do controller configure
 400  * @ci: the controller
 401  *
 402  */
 403 void ci_platform_configure(struct ci_hdrc *ci)
 404 {
 405         bool is_device_mode, is_host_mode;
 406
 407         is_device_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_DC;
 408         is_host_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_HC;
 409
 410         if (is_device_mode) {
 411                 phy_set_mode(ci->phy, PHY_MODE_USB_DEVICE);
 412
 413                 if (ci->platdata->flags & CI_HDRC_DISABLE_DEVICE_STREAMING)
 414                         hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
 415                                  USBMODE_CI_SDIS);
 416         }
 417
 418         if (is_host_mode) {
 419                 phy_set_mode(ci->phy, PHY_MODE_USB_HOST);
 420
 421                 if (ci->platdata->flags & CI_HDRC_DISABLE_HOST_STREAMING)
 422                         hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
 423                                  USBMODE_CI_SDIS);
 424         }
 425
 426         if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) {
 427                 if (ci->hw_bank.lpm)
 428                         hw_write(ci, OP_DEVLC, DEVLC_PFSC, DEVLC_PFSC);
 429                 else
 430                         hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
 431         }
 432
 433         if (ci->platdata->flags & CI_HDRC_SET_NON_ZERO_TTHA)
 434                 hw_write(ci, OP_TTCTRL, TTCTRL_TTHA_MASK, TTCTRL_TTHA);
 435
 436         hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
 437
 438         if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
 439                 hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
 440                         ci->platdata->ahb_burst_config);
 441
 442         /* override burst size, take effect only when ahb_burst_config is 0 */
 443         if (!hw_read_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK)) {
 444                 if (ci->platdata->flags & CI_HDRC_OVERRIDE_TX_BURST)
 445                         hw_write(ci, OP_BURSTSIZE, TX_BURST_MASK,
 446                         ci->platdata->tx_burst_size << __ffs(TX_BURST_MASK));
 447
 448                 if (ci->platdata->flags & CI_HDRC_OVERRIDE_RX_BURST)
 449                         hw_write(ci, OP_BURSTSIZE, RX_BURST_MASK,
 450                                 ci->platdata->rx_burst_size);
 451         }
 452 }
 453
 454 /**
 455  * hw_controller_reset: do controller reset
 456  * @ci: the controller
 457   *
 458  * This function returns an error code
 459  */
 460 static int hw_controller_reset(struct ci_hdrc *ci)
 461 {
 462         int count = 0;
 463
 464         hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
 465         while (hw_read(ci, OP_USBCMD, USBCMD_RST)) {
 466                 udelay(10);
 467                 if (count++ > 1000)
 468                         return -ETIMEDOUT;
 469         }
 470
 471         return 0;
 472 }
 473
 474 /**
 475  * hw_device_reset: resets chip (execute without interruption)
 476  * @ci: the controller
 477  *
 478  * This function returns an error code
 479  */
 480 int hw_device_reset(struct ci_hdrc *ci)
 481 {
 482         int ret;
 483
 484         /* should flush & stop before reset */
 485         hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
 486         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
 487
 488         ret = hw_controller_reset(ci);
 489         if (ret) {
 490                 dev_err(ci->dev, "error resetting controller, ret=%d\n", ret);
 491                 return ret;
 492         }
 493
 494         if (ci->platdata->notify_event) {
 495                 ret = ci->platdata->notify_event(ci,
 496                         CI_HDRC_CONTROLLER_RESET_EVENT);
 497                 if (ret)
 498                         return ret;
 499         }
 500
 501         /* USBMODE should be configured step by step */
 502         hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
 503         hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_DC);
 504         /* HW >= 2.3 */
 505         hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
 506
 507         if (hw_read(ci, OP_USBMODE, USBMODE_CM) != USBMODE_CM_DC) {
 508                 dev_err(ci->dev, "cannot enter in %s device mode\n",
 509                         ci_role(ci)->name);
 510                 dev_err(ci->dev, "lpm = %i\n", ci->hw_bank.lpm);
 511                 return -ENODEV;
 512         }
 513
 514         ci_platform_configure(ci);
 515
 516         return 0;
 517 }
 518
 519 static irqreturn_t ci_irq_handler(int irq, void *data)
 520 {
 521         struct ci_hdrc *ci = data;
 522         irqreturn_t ret = IRQ_NONE;
 523         u32 otgsc = 0;
 524
 525         if (ci->in_lpm) {
 526                 disable_irq_nosync(irq);
 527                 ci->wakeup_int = true;
 528                 pm_runtime_get(ci->dev);
 529                 return IRQ_HANDLED;
 530         }
 531
 532         if (ci->is_otg) {
 533                 otgsc = hw_read_otgsc(ci, ~0);
 534                 if (ci_otg_is_fsm_mode(ci)) {
 535                         ret = ci_otg_fsm_irq(ci);
 536                         if (ret == IRQ_HANDLED)
 537                                 return ret;
 538                 }
 539         }
 540
 541         /*
 542          * Handle id change interrupt, it indicates device/host function
 543          * switch.
 544          */
 545         if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
 546                 ci->id_event = true;
 547                 /* Clear ID change irq status */
 548                 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
 549                 ci_otg_queue_work(ci);
 550                 return IRQ_HANDLED;
 551         }
 552
 553         /*
 554          * Handle vbus change interrupt, it indicates device connection
 555          * and disconnection events.
 556          */
 557         if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
 558                 ci->b_sess_valid_event = true;
 559                 /* Clear BSV irq */
 560                 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
 561                 ci_otg_queue_work(ci);
 562                 return IRQ_HANDLED;
 563         }
 564
 565         /* Handle device/host interrupt */
 566         if (ci->role != CI_ROLE_END)
 567                 ret = ci_role(ci)->irq(ci);
 568
 569         return ret;
 570 }
 571
 572 static void ci_irq(struct ci_hdrc *ci)
 573 {
 574         unsigned long flags;
 575
 576         local_irq_save(flags);
 577         ci_irq_handler(ci->irq, ci);
 578         local_irq_restore(flags);
 579 }
 580
 581 static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
 582                              void *ptr)
 583 {
 584         struct ci_hdrc_cable *cbl = container_of(nb, struct ci_hdrc_cable, nb);
 585         struct ci_hdrc *ci = cbl->ci;
 586
 587         cbl->connected = event;
 588         cbl->changed = true;
 589
 590         ci_irq(ci);
 591         return NOTIFY_DONE;
 592 }
 593
 594 static enum usb_role ci_usb_role_switch_get(struct usb_role_switch *sw)
 595 {
 596         struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
 597         enum usb_role role;
 598         unsigned long flags;
 599
 600         spin_lock_irqsave(&ci->lock, flags);
 601         role = ci_role_to_usb_role(ci);
 602         spin_unlock_irqrestore(&ci->lock, flags);
 603
 604         return role;
 605 }
 606
 607 static int ci_usb_role_switch_set(struct usb_role_switch *sw,
 608                                   enum usb_role role)
 609 {
 610         struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
 611         struct ci_hdrc_cable *cable;
 612
 613         if (role == USB_ROLE_HOST) {
 614                 cable = &ci->platdata->id_extcon;
 615                 cable->changed = true;
 616                 cable->connected = true;
 617                 cable = &ci->platdata->vbus_extcon;
 618                 cable->changed = true;
 619                 cable->connected = false;
 620         } else if (role == USB_ROLE_DEVICE) {
 621                 cable = &ci->platdata->id_extcon;
 622                 cable->changed = true;
 623                 cable->connected = false;
 624                 cable = &ci->platdata->vbus_extcon;
 625                 cable->changed = true;
 626                 cable->connected = true;
 627         } else {
 628                 cable = &ci->platdata->id_extcon;
 629                 cable->changed = true;
 630                 cable->connected = false;
 631                 cable = &ci->platdata->vbus_extcon;
 632                 cable->changed = true;
 633                 cable->connected = false;
 634         }
 635
 636         ci_irq(ci);
 637         return 0;
 638 }
 639
 640 static enum ci_role ci_get_role(struct ci_hdrc *ci)
 641 {
 642         enum ci_role role;
 643
 644         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
 645                 if (ci->is_otg) {
 646                         role = ci_otg_role(ci);
 647                         hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
 648                 } else {
 649                         /*
 650                          * If the controller is not OTG capable, but support
 651                          * role switch, the defalt role is gadget, and the
 652                          * user can switch it through debugfs.
 653                          */
 654                         role = CI_ROLE_GADGET;
 655                 }
 656         } else {
 657                 role = ci->roles[CI_ROLE_HOST] ? CI_ROLE_HOST
 658                                         : CI_ROLE_GADGET;
 659         }
 660
 661         return role;
 662 }
 663
 664 static struct usb_role_switch_desc ci_role_switch = {
 665         .set = ci_usb_role_switch_set,
 666         .get = ci_usb_role_switch_get,
 667         .allow_userspace_control = true,
 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_property_read_bool(dev->of_node, "non-zero-ttctrl-ttha"))
 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         if (!platdata->enter_lpm)
 817                 platdata->enter_lpm = ci_hdrc_enter_lpm_common;
 818
 819         return 0;
 820 }
 821
 822 static int ci_extcon_register(struct ci_hdrc *ci)
 823 {
 824         struct ci_hdrc_cable *id, *vbus;
 825         int ret;
 826
 827         id = &ci->platdata->id_extcon;
 828         id->ci = ci;
 829         if (!IS_ERR_OR_NULL(id->edev)) {
 830                 ret = devm_extcon_register_notifier(ci->dev, id->edev,
 831                                                 EXTCON_USB_HOST, &id->nb);
 832                 if (ret < 0) {
 833                         dev_err(ci->dev, "register ID failed\n");
 834                         return ret;
 835                 }
 836         }
 837
 838         vbus = &ci->platdata->vbus_extcon;
 839         vbus->ci = ci;
 840         if (!IS_ERR_OR_NULL(vbus->edev)) {
 841                 ret = devm_extcon_register_notifier(ci->dev, vbus->edev,
 842                                                 EXTCON_USB, &vbus->nb);
 843                 if (ret < 0) {
 844                         dev_err(ci->dev, "register VBUS failed\n");
 845                         return ret;
 846                 }
 847         }
 848
 849         return 0;
 850 }
 851
 852 static DEFINE_IDA(ci_ida);
 853
 854 struct platform_device *ci_hdrc_add_device(struct device *dev,
 855                         struct resource *res, int nres,
 856                         struct ci_hdrc_platform_data *platdata)
 857 {
 858         struct platform_device *pdev;
 859         int id, ret;
 860
 861         ret = ci_get_platdata(dev, platdata);
 862         if (ret)
 863                 return ERR_PTR(ret);
 864
 865         id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
 866         if (id < 0)
 867                 return ERR_PTR(id);
 868
 869         pdev = platform_device_alloc("ci_hdrc", id);
 870         if (!pdev) {
 871                 ret = -ENOMEM;
 872                 goto put_id;
 873         }
 874
 875         pdev->dev.parent = dev;
 876         device_set_of_node_from_dev(&pdev->dev, dev);
 877
 878         ret = platform_device_add_resources(pdev, res, nres);
 879         if (ret)
 880                 goto err;
 881
 882         ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
 883         if (ret)
 884                 goto err;
 885
 886         ret = platform_device_add(pdev);
 887         if (ret)
 888                 goto err;
 889
 890         return pdev;
 891
 892 err:
 893         platform_device_put(pdev);
 894 put_id:
 895         ida_simple_remove(&ci_ida, id);
 896         return ERR_PTR(ret);
 897 }
 898 EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
 899
 900 void ci_hdrc_remove_device(struct platform_device *pdev)
 901 {
 902         int id = pdev->id;
 903         platform_device_unregister(pdev);
 904         ida_simple_remove(&ci_ida, id);
 905 }
 906 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
 907
 908 /**
 909  * ci_hdrc_query_available_role: get runtime available operation mode
 910  *
 911  * The glue layer can get current operation mode (host/peripheral/otg)
 912  * This function should be called after ci core device has created.
 913  *
 914  * @pdev: the platform device of ci core.
 915  *
 916  * Return runtime usb_dr_mode.
 917  */
 918 enum usb_dr_mode ci_hdrc_query_available_role(struct platform_device *pdev)
 919 {
 920         struct ci_hdrc *ci = platform_get_drvdata(pdev);
 921
 922         if (!ci)
 923                 return USB_DR_MODE_UNKNOWN;
 924         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])
 925                 return USB_DR_MODE_OTG;
 926         else if (ci->roles[CI_ROLE_HOST])
 927                 return USB_DR_MODE_HOST;
 928         else if (ci->roles[CI_ROLE_GADGET])
 929                 return USB_DR_MODE_PERIPHERAL;
 930         else
 931                 return USB_DR_MODE_UNKNOWN;
 932 }
 933 EXPORT_SYMBOL_GPL(ci_hdrc_query_available_role);
 934
 935 static inline void ci_role_destroy(struct ci_hdrc *ci)
 936 {
 937         ci_hdrc_gadget_destroy(ci);
 938         ci_hdrc_host_destroy(ci);
 939         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
 940                 ci_hdrc_otg_destroy(ci);
 941 }
 942
 943 static void ci_get_otg_capable(struct ci_hdrc *ci)
 944 {
 945         if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
 946                 ci->is_otg = false;
 947         else
 948                 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
 949                                 DCCPARAMS_DC | DCCPARAMS_HC)
 950                                         == (DCCPARAMS_DC | DCCPARAMS_HC));
 951         if (ci->is_otg) {
 952                 dev_dbg(ci->dev, "It is OTG capable controller\n");
 953                 /* Disable and clear all OTG irq */
 954                 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
 955                                                         OTGSC_INT_STATUS_BITS);
 956         }
 957 }
 958
 959 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
 960                           char *buf)
 961 {
 962         struct ci_hdrc *ci = dev_get_drvdata(dev);
 963
 964         if (ci->role != CI_ROLE_END)
 965                 return sprintf(buf, "%s\n", ci_role(ci)->name);
 966
 967         return 0;
 968 }
 969
 970 static ssize_t role_store(struct device *dev,
 971                 struct device_attribute *attr, const char *buf, size_t n)
 972 {
 973         struct ci_hdrc *ci = dev_get_drvdata(dev);
 974         enum ci_role role;
 975         int ret;
 976
 977         if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
 978                 dev_warn(dev, "Current configuration is not dual-role, quit\n");
 979                 return -EPERM;
 980         }
 981
 982         for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
 983                 if (!strncmp(buf, ci->roles[role]->name,
 984                              strlen(ci->roles[role]->name)))
 985                         break;
 986
 987         if (role == CI_ROLE_END)
 988                 return -EINVAL;
 989
 990         mutex_lock(&ci->mutex);
 991
 992         if (role == ci->role) {
 993                 mutex_unlock(&ci->mutex);
 994                 return n;
 995         }
 996
 997         pm_runtime_get_sync(dev);
 998         disable_irq(ci->irq);
 999         ci_role_stop(ci);
1000         ret = ci_role_start(ci, role);
1001         if (!ret && ci->role == CI_ROLE_GADGET)
1002                 ci_handle_vbus_change(ci);
1003         enable_irq(ci->irq);
1004         pm_runtime_put_sync(dev);
1005         mutex_unlock(&ci->mutex);
1006
1007         return (ret == 0) ? n : ret;
1008 }
1009 static DEVICE_ATTR_RW(role);
1010
1011 static struct attribute *ci_attrs[] = {
1012         &dev_attr_role.attr,
1013         NULL,
1014 };
1015 ATTRIBUTE_GROUPS(ci);
1016
1017 static int ci_hdrc_probe(struct platform_device *pdev)
1018 {
1019         struct device   *dev = &pdev->dev;
1020         struct ci_hdrc  *ci;
1021         struct resource *res;
1022         void __iomem    *base;
1023         int             ret;
1024         enum usb_dr_mode dr_mode;
1025
1026         if (!dev_get_platdata(dev)) {
1027                 dev_err(dev, "platform data missing\n");
1028                 return -ENODEV;
1029         }
1030
1031         base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1032         if (IS_ERR(base))
1033                 return PTR_ERR(base);
1034
1035         ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
1036         if (!ci)
1037                 return -ENOMEM;
1038
1039         spin_lock_init(&ci->lock);
1040         mutex_init(&ci->mutex);
1041         ci->dev = dev;
1042         ci->platdata = dev_get_platdata(dev);
1043         ci->imx28_write_fix = !!(ci->platdata->flags &
1044                 CI_HDRC_IMX28_WRITE_FIX);
1045         ci->supports_runtime_pm = !!(ci->platdata->flags &
1046                 CI_HDRC_SUPPORTS_RUNTIME_PM);
1047         ci->has_portsc_pec_bug = !!(ci->platdata->flags &
1048                 CI_HDRC_HAS_PORTSC_PEC_MISSED);
1049         platform_set_drvdata(pdev, ci);
1050
1051         ret = hw_device_init(ci, base);
1052         if (ret < 0) {
1053                 dev_err(dev, "can't initialize hardware\n");
1054                 return -ENODEV;
1055         }
1056
1057         ret = ci_ulpi_init(ci);
1058         if (ret)
1059                 return ret;
1060
1061         if (ci->platdata->phy) {
1062                 ci->phy = ci->platdata->phy;
1063         } else if (ci->platdata->usb_phy) {
1064                 ci->usb_phy = ci->platdata->usb_phy;
1065         } else {
1066                 /* Look for a generic PHY first */
1067                 ci->phy = devm_phy_get(dev->parent, "usb-phy");
1068
1069                 if (PTR_ERR(ci->phy) == -EPROBE_DEFER) {
1070                         ret = -EPROBE_DEFER;
1071                         goto ulpi_exit;
1072                 } else if (IS_ERR(ci->phy)) {
1073                         ci->phy = NULL;
1074                 }
1075
1076                 /* Look for a legacy USB PHY from device-tree next */
1077                 if (!ci->phy) {
1078                         ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent,
1079                                                                   "phys", 0);
1080
1081                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1082                                 ret = -EPROBE_DEFER;
1083                                 goto ulpi_exit;
1084                         } else if (IS_ERR(ci->usb_phy)) {
1085                                 ci->usb_phy = NULL;
1086                         }
1087                 }
1088
1089                 /* Look for any registered legacy USB PHY as last resort */
1090                 if (!ci->phy && !ci->usb_phy) {
1091                         ci->usb_phy = devm_usb_get_phy(dev->parent,
1092                                                        USB_PHY_TYPE_USB2);
1093
1094                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1095                                 ret = -EPROBE_DEFER;
1096                                 goto ulpi_exit;
1097                         } else if (IS_ERR(ci->usb_phy)) {
1098                                 ci->usb_phy = NULL;
1099                         }
1100                 }
1101
1102                 /* No USB PHY was found in the end */
1103                 if (!ci->phy && !ci->usb_phy) {
1104                         ret = -ENXIO;
1105                         goto ulpi_exit;
1106                 }
1107         }
1108
1109         ret = ci_usb_phy_init(ci);
1110         if (ret) {
1111                 dev_err(dev, "unable to init phy: %d\n", ret);
1112                 goto ulpi_exit;
1113         }
1114
1115         ci->hw_bank.phys = res->start;
1116
1117         ci->irq = platform_get_irq(pdev, 0);
1118         if (ci->irq < 0) {
1119                 ret = ci->irq;
1120                 goto deinit_phy;
1121         }
1122
1123         ci_get_otg_capable(ci);
1124
1125         dr_mode = ci->platdata->dr_mode;
1126         /* initialize role(s) before the interrupt is requested */
1127         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
1128                 ret = ci_hdrc_host_init(ci);
1129                 if (ret) {
1130                         if (ret == -ENXIO)
1131                                 dev_info(dev, "doesn't support host\n");
1132                         else
1133                                 goto deinit_phy;
1134                 }
1135         }
1136
1137         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
1138                 ret = ci_hdrc_gadget_init(ci);
1139                 if (ret) {
1140                         if (ret == -ENXIO)
1141                                 dev_info(dev, "doesn't support gadget\n");
1142                         else
1143                                 goto deinit_host;
1144                 }
1145         }
1146
1147         if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
1148                 dev_err(dev, "no supported roles\n");
1149                 ret = -ENODEV;
1150                 goto deinit_gadget;
1151         }
1152
1153         if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
1154                 ret = ci_hdrc_otg_init(ci);
1155                 if (ret) {
1156                         dev_err(dev, "init otg fails, ret = %d\n", ret);
1157                         goto deinit_gadget;
1158                 }
1159         }
1160
1161         if (ci_role_switch.fwnode) {
1162                 ci_role_switch.driver_data = ci;
1163                 ci->role_switch = usb_role_switch_register(dev,
1164                                         &ci_role_switch);
1165                 if (IS_ERR(ci->role_switch)) {
1166                         ret = PTR_ERR(ci->role_switch);
1167                         goto deinit_otg;
1168                 }
1169         }
1170
1171         ci->role = ci_get_role(ci);
1172         if (!ci_otg_is_fsm_mode(ci)) {
1173                 /* only update vbus status for peripheral */
1174                 if (ci->role == CI_ROLE_GADGET) {
1175                         /* Pull down DP for possible charger detection */
1176                         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1177                         ci_handle_vbus_change(ci);
1178                 }
1179
1180                 ret = ci_role_start(ci, ci->role);
1181                 if (ret) {
1182                         dev_err(dev, "can't start %s role\n",
1183                                                 ci_role(ci)->name);
1184                         goto stop;
1185                 }
1186         }
1187
1188         ret = devm_request_irq(dev, ci->irq, ci_irq_handler, IRQF_SHARED,
1189                         ci->platdata->name, ci);
1190         if (ret)
1191                 goto stop;
1192
1193         ret = ci_extcon_register(ci);
1194         if (ret)
1195                 goto stop;
1196
1197         if (ci->supports_runtime_pm) {
1198                 pm_runtime_set_active(&pdev->dev);
1199                 pm_runtime_enable(&pdev->dev);
1200                 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
1201                 pm_runtime_mark_last_busy(ci->dev);
1202                 pm_runtime_use_autosuspend(&pdev->dev);
1203         }
1204
1205         if (ci_otg_is_fsm_mode(ci))
1206                 ci_hdrc_otg_fsm_start(ci);
1207
1208         device_set_wakeup_capable(&pdev->dev, true);
1209         dbg_create_files(ci);
1210
1211         return 0;
1212
1213 stop:
1214         if (ci->role_switch)
1215                 usb_role_switch_unregister(ci->role_switch);
1216 deinit_otg:
1217         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
1218                 ci_hdrc_otg_destroy(ci);
1219 deinit_gadget:
1220         ci_hdrc_gadget_destroy(ci);
1221 deinit_host:
1222         ci_hdrc_host_destroy(ci);
1223 deinit_phy:
1224         ci_usb_phy_exit(ci);
1225 ulpi_exit:
1226         ci_ulpi_exit(ci);
1227
1228         return ret;
1229 }
1230
1231 static void ci_hdrc_remove(struct platform_device *pdev)
1232 {
1233         struct ci_hdrc *ci = platform_get_drvdata(pdev);
1234
1235         if (ci->role_switch)
1236                 usb_role_switch_unregister(ci->role_switch);
1237
1238         if (ci->supports_runtime_pm) {
1239                 pm_runtime_get_sync(&pdev->dev);
1240                 pm_runtime_disable(&pdev->dev);
1241                 pm_runtime_put_noidle(&pdev->dev);
1242         }
1243
1244         dbg_remove_files(ci);
1245         ci_role_destroy(ci);
1246         ci_hdrc_enter_lpm(ci, true);
1247         ci_usb_phy_exit(ci);
1248         ci_ulpi_exit(ci);
1249 }
1250
1251 #ifdef CONFIG_PM
1252 /* Prepare wakeup by SRP before suspend */
1253 static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
1254 {
1255         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1256                                 !hw_read_otgsc(ci, OTGSC_ID)) {
1257                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
1258                                                                 PORTSC_PP);
1259                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
1260                                                                 PORTSC_WKCN);
1261         }
1262 }
1263
1264 /* Handle SRP when wakeup by data pulse */
1265 static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
1266 {
1267         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1268                 (ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
1269                 if (!hw_read_otgsc(ci, OTGSC_ID)) {
1270                         ci->fsm.a_srp_det = 1;
1271                         ci->fsm.a_bus_drop = 0;
1272                 } else {
1273                         ci->fsm.id = 1;
1274                 }
1275                 ci_otg_queue_work(ci);
1276         }
1277 }
1278
1279 static void ci_controller_suspend(struct ci_hdrc *ci)
1280 {
1281         disable_irq(ci->irq);
1282         ci_hdrc_enter_lpm(ci, true);
1283         if (ci->platdata->phy_clkgate_delay_us)
1284                 usleep_range(ci->platdata->phy_clkgate_delay_us,
1285                              ci->platdata->phy_clkgate_delay_us + 50);
1286         usb_phy_set_suspend(ci->usb_phy, 1);
1287         ci->in_lpm = true;
1288         enable_irq(ci->irq);
1289 }
1290
1291 /*
1292  * Handle the wakeup interrupt triggered by extcon connector
1293  * We need to call ci_irq again for extcon since the first
1294  * interrupt (wakeup int) only let the controller be out of
1295  * low power mode, but not handle any interrupts.
1296  */
1297 static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
1298 {
1299         struct ci_hdrc_cable *cable_id, *cable_vbus;
1300         u32 otgsc = hw_read_otgsc(ci, ~0);
1301
1302         cable_id = &ci->platdata->id_extcon;
1303         cable_vbus = &ci->platdata->vbus_extcon;
1304
1305         if ((!IS_ERR(cable_id->edev) || ci->role_switch)
1306                 && ci->is_otg &&
1307                 (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS))
1308                 ci_irq(ci);
1309
1310         if ((!IS_ERR(cable_vbus->edev) || ci->role_switch)
1311                 && ci->is_otg &&
1312                 (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS))
1313                 ci_irq(ci);
1314 }
1315
1316 static int ci_controller_resume(struct device *dev)
1317 {
1318         struct ci_hdrc *ci = dev_get_drvdata(dev);
1319         int ret;
1320
1321         dev_dbg(dev, "at %s\n", __func__);
1322
1323         if (!ci->in_lpm) {
1324                 WARN_ON(1);
1325                 return 0;
1326         }
1327
1328         ci_hdrc_enter_lpm(ci, false);
1329
1330         ret = ci_ulpi_resume(ci);
1331         if (ret)
1332                 return ret;
1333
1334         if (ci->usb_phy) {
1335                 usb_phy_set_suspend(ci->usb_phy, 0);
1336                 usb_phy_set_wakeup(ci->usb_phy, false);
1337                 hw_wait_phy_stable();
1338         }
1339
1340         ci->in_lpm = false;
1341         if (ci->wakeup_int) {
1342                 ci->wakeup_int = false;
1343                 pm_runtime_mark_last_busy(ci->dev);
1344                 pm_runtime_put_autosuspend(ci->dev);
1345                 enable_irq(ci->irq);
1346                 if (ci_otg_is_fsm_mode(ci))
1347                         ci_otg_fsm_wakeup_by_srp(ci);
1348                 ci_extcon_wakeup_int(ci);
1349         }
1350
1351         return 0;
1352 }
1353
1354 #ifdef CONFIG_PM_SLEEP
1355 static int ci_suspend(struct device *dev)
1356 {
1357         struct ci_hdrc *ci = dev_get_drvdata(dev);
1358
1359         if (ci->wq)
1360                 flush_workqueue(ci->wq);
1361         /*
1362          * Controller needs to be active during suspend, otherwise the core
1363          * may run resume when the parent is at suspend if other driver's
1364          * suspend fails, it occurs before parent's suspend has not started,
1365          * but the core suspend has finished.
1366          */
1367         if (ci->in_lpm)
1368                 pm_runtime_resume(dev);
1369
1370         if (ci->in_lpm) {
1371                 WARN_ON(1);
1372                 return 0;
1373         }
1374
1375         /* Extra routine per role before system suspend */
1376         if (ci->role != CI_ROLE_END && ci_role(ci)->suspend)
1377                 ci_role(ci)->suspend(ci);
1378
1379         if (device_may_wakeup(dev)) {
1380                 if (ci_otg_is_fsm_mode(ci))
1381                         ci_otg_fsm_suspend_for_srp(ci);
1382
1383                 usb_phy_set_wakeup(ci->usb_phy, true);
1384                 enable_irq_wake(ci->irq);
1385         }
1386
1387         ci_controller_suspend(ci);
1388
1389         return 0;
1390 }
1391
1392 static void ci_handle_power_lost(struct ci_hdrc *ci)
1393 {
1394         enum ci_role role;
1395
1396         disable_irq_nosync(ci->irq);
1397         if (!ci_otg_is_fsm_mode(ci)) {
1398                 role = ci_get_role(ci);
1399
1400                 if (ci->role != role) {
1401                         ci_handle_id_switch(ci);
1402                 } else if (role == CI_ROLE_GADGET) {
1403                         if (ci->is_otg && hw_read_otgsc(ci, OTGSC_BSV))
1404                                 usb_gadget_vbus_connect(&ci->gadget);
1405                 }
1406         }
1407
1408         enable_irq(ci->irq);
1409 }
1410
1411 static int ci_resume(struct device *dev)
1412 {
1413         struct ci_hdrc *ci = dev_get_drvdata(dev);
1414         bool power_lost;
1415         int ret;
1416
1417         /* Since ASYNCLISTADDR (host mode) and ENDPTLISTADDR (device
1418          * mode) share the same register address. We can check if
1419          * controller resume from power lost based on this address
1420          * due to this register will be reset after power lost.
1421          */
1422         power_lost = !hw_read(ci, OP_ENDPTLISTADDR, ~0);
1423
1424         if (device_may_wakeup(dev))
1425                 disable_irq_wake(ci->irq);
1426
1427         ret = ci_controller_resume(dev);
1428         if (ret)
1429                 return ret;
1430
1431         if (power_lost) {
1432                 /* shutdown and re-init for phy */
1433                 ci_usb_phy_exit(ci);
1434                 ci_usb_phy_init(ci);
1435         }
1436
1437         /* Extra routine per role after system resume */
1438         if (ci->role != CI_ROLE_END && ci_role(ci)->resume)
1439                 ci_role(ci)->resume(ci, power_lost);
1440
1441         if (power_lost)
1442                 ci_handle_power_lost(ci);
1443
1444         if (ci->supports_runtime_pm) {
1445                 pm_runtime_disable(dev);
1446                 pm_runtime_set_active(dev);
1447                 pm_runtime_enable(dev);
1448         }
1449
1450         return ret;
1451 }
1452 #endif /* CONFIG_PM_SLEEP */
1453
1454 static int ci_runtime_suspend(struct device *dev)
1455 {
1456         struct ci_hdrc *ci = dev_get_drvdata(dev);
1457
1458         dev_dbg(dev, "at %s\n", __func__);
1459
1460         if (ci->in_lpm) {
1461                 WARN_ON(1);
1462                 return 0;
1463         }
1464
1465         if (ci_otg_is_fsm_mode(ci))
1466                 ci_otg_fsm_suspend_for_srp(ci);
1467
1468         usb_phy_set_wakeup(ci->usb_phy, true);
1469         ci_controller_suspend(ci);
1470
1471         return 0;
1472 }
1473
1474 static int ci_runtime_resume(struct device *dev)
1475 {
1476         return ci_controller_resume(dev);
1477 }
1478
1479 #endif /* CONFIG_PM */
1480 static const struct dev_pm_ops ci_pm_ops = {
1481         SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
1482         SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
1483 };
1484
1485 static struct platform_driver ci_hdrc_driver = {
1486         .probe  = ci_hdrc_probe,
1487         .remove_new = ci_hdrc_remove,
1488         .driver = {
1489                 .name   = "ci_hdrc",
1490                 .pm     = &ci_pm_ops,
1491                 .dev_groups = ci_groups,
1492         },
1493 };
1494
1495 static int __init ci_hdrc_platform_register(void)
1496 {
1497         ci_hdrc_host_driver_init();
1498         return platform_driver_register(&ci_hdrc_driver);
1499 }
1500 module_init(ci_hdrc_platform_register);
1501
1502 static void __exit ci_hdrc_platform_unregister(void)
1503 {
1504         platform_driver_unregister(&ci_hdrc_driver);
1505 }
1506 module_exit(ci_hdrc_platform_unregister);
1507
1508 MODULE_ALIAS("platform:ci_hdrc");
1509 MODULE_LICENSE("GPL v2");
1510 MODULE_AUTHOR("David Lopo <[email protected]>");
1511 MODULE_DESCRIPTION("ChipIdea HDRC Driver");