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 = NULL;
 612         enum usb_role current_role = ci_role_to_usb_role(ci);
 613         enum ci_role ci_role = usb_role_to_ci_role(role);
 614         unsigned long flags;
 615
 616         if ((ci_role != CI_ROLE_END && !ci->roles[ci_role]) ||
 617             (current_role == role))
 618                 return 0;
 619
 620         pm_runtime_get_sync(ci->dev);
 621         /* Stop current role */
 622         spin_lock_irqsave(&ci->lock, flags);
 623         if (current_role == USB_ROLE_DEVICE)
 624                 cable = &ci->platdata->vbus_extcon;
 625         else if (current_role == USB_ROLE_HOST)
 626                 cable = &ci->platdata->id_extcon;
 627
 628         if (cable) {
 629                 cable->changed = true;
 630                 cable->connected = false;
 631                 ci_irq(ci);
 632                 spin_unlock_irqrestore(&ci->lock, flags);
 633                 if (ci->wq && role != USB_ROLE_NONE)
 634                         flush_workqueue(ci->wq);
 635                 spin_lock_irqsave(&ci->lock, flags);
 636         }
 637
 638         cable = NULL;
 639
 640         /* Start target role */
 641         if (role == USB_ROLE_DEVICE)
 642                 cable = &ci->platdata->vbus_extcon;
 643         else if (role == USB_ROLE_HOST)
 644                 cable = &ci->platdata->id_extcon;
 645
 646         if (cable) {
 647                 cable->changed = true;
 648                 cable->connected = true;
 649                 ci_irq(ci);
 650         }
 651         spin_unlock_irqrestore(&ci->lock, flags);
 652         pm_runtime_put_sync(ci->dev);
 653
 654         return 0;
 655 }
 656
 657 static struct usb_role_switch_desc ci_role_switch = {
 658         .set = ci_usb_role_switch_set,
 659         .get = ci_usb_role_switch_get,
 660         .allow_userspace_control = true,
 661 };
 662
 663 static int ci_get_platdata(struct device *dev,
 664                 struct ci_hdrc_platform_data *platdata)
 665 {
 666         struct extcon_dev *ext_vbus, *ext_id;
 667         struct ci_hdrc_cable *cable;
 668         int ret;
 669
 670         if (!platdata->phy_mode)
 671                 platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
 672
 673         if (!platdata->dr_mode)
 674                 platdata->dr_mode = usb_get_dr_mode(dev);
 675
 676         if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
 677                 platdata->dr_mode = USB_DR_MODE_OTG;
 678
 679         if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
 680                 /* Get the vbus regulator */
 681                 platdata->reg_vbus = devm_regulator_get_optional(dev, "vbus");
 682                 if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
 683                         return -EPROBE_DEFER;
 684                 } else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
 685                         /* no vbus regulator is needed */
 686                         platdata->reg_vbus = NULL;
 687                 } else if (IS_ERR(platdata->reg_vbus)) {
 688                         dev_err(dev, "Getting regulator error: %ld\n",
 689                                 PTR_ERR(platdata->reg_vbus));
 690                         return PTR_ERR(platdata->reg_vbus);
 691                 }
 692                 /* Get TPL support */
 693                 if (!platdata->tpl_support)
 694                         platdata->tpl_support =
 695                                 of_usb_host_tpl_support(dev->of_node);
 696         }
 697
 698         if (platdata->dr_mode == USB_DR_MODE_OTG) {
 699                 /* We can support HNP and SRP of OTG 2.0 */
 700                 platdata->ci_otg_caps.otg_rev = 0x0200;
 701                 platdata->ci_otg_caps.hnp_support = true;
 702                 platdata->ci_otg_caps.srp_support = true;
 703
 704                 /* Update otg capabilities by DT properties */
 705                 ret = of_usb_update_otg_caps(dev->of_node,
 706                                         &platdata->ci_otg_caps);
 707                 if (ret)
 708                         return ret;
 709         }
 710
 711         if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
 712                 platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
 713
 714         of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
 715                                      &platdata->phy_clkgate_delay_us);
 716
 717         platdata->itc_setting = 1;
 718
 719         of_property_read_u32(dev->of_node, "itc-setting",
 720                                         &platdata->itc_setting);
 721
 722         ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
 723                                 &platdata->ahb_burst_config);
 724         if (!ret) {
 725                 platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
 726         } else if (ret != -EINVAL) {
 727                 dev_err(dev, "failed to get ahb-burst-config\n");
 728                 return ret;
 729         }
 730
 731         ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
 732                                 &platdata->tx_burst_size);
 733         if (!ret) {
 734                 platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
 735         } else if (ret != -EINVAL) {
 736                 dev_err(dev, "failed to get tx-burst-size-dword\n");
 737                 return ret;
 738         }
 739
 740         ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
 741                                 &platdata->rx_burst_size);
 742         if (!ret) {
 743                 platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
 744         } else if (ret != -EINVAL) {
 745                 dev_err(dev, "failed to get rx-burst-size-dword\n");
 746                 return ret;
 747         }
 748
 749         if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL))
 750                 platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
 751
 752         ext_id = ERR_PTR(-ENODEV);
 753         ext_vbus = ERR_PTR(-ENODEV);
 754         if (of_property_read_bool(dev->of_node, "extcon")) {
 755                 /* Each one of them is not mandatory */
 756                 ext_vbus = extcon_get_edev_by_phandle(dev, 0);
 757                 if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
 758                         return PTR_ERR(ext_vbus);
 759
 760                 ext_id = extcon_get_edev_by_phandle(dev, 1);
 761                 if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
 762                         return PTR_ERR(ext_id);
 763         }
 764
 765         cable = &platdata->vbus_extcon;
 766         cable->nb.notifier_call = ci_cable_notifier;
 767         cable->edev = ext_vbus;
 768
 769         if (!IS_ERR(ext_vbus)) {
 770                 ret = extcon_get_state(cable->edev, EXTCON_USB);
 771                 if (ret)
 772                         cable->connected = true;
 773                 else
 774                         cable->connected = false;
 775         }
 776
 777         cable = &platdata->id_extcon;
 778         cable->nb.notifier_call = ci_cable_notifier;
 779         cable->edev = ext_id;
 780
 781         if (!IS_ERR(ext_id)) {
 782                 ret = extcon_get_state(cable->edev, EXTCON_USB_HOST);
 783                 if (ret)
 784                         cable->connected = true;
 785                 else
 786                         cable->connected = false;
 787         }
 788
 789         if (device_property_read_bool(dev, "usb-role-switch"))
 790                 ci_role_switch.fwnode = dev->fwnode;
 791
 792         platdata->pctl = devm_pinctrl_get(dev);
 793         if (!IS_ERR(platdata->pctl)) {
 794                 struct pinctrl_state *p;
 795
 796                 p = pinctrl_lookup_state(platdata->pctl, "default");
 797                 if (!IS_ERR(p))
 798                         platdata->pins_default = p;
 799
 800                 p = pinctrl_lookup_state(platdata->pctl, "host");
 801                 if (!IS_ERR(p))
 802                         platdata->pins_host = p;
 803
 804                 p = pinctrl_lookup_state(platdata->pctl, "device");
 805                 if (!IS_ERR(p))
 806                         platdata->pins_device = p;
 807         }
 808
 809         if (!platdata->enter_lpm)
 810                 platdata->enter_lpm = ci_hdrc_enter_lpm_common;
 811
 812         return 0;
 813 }
 814
 815 static int ci_extcon_register(struct ci_hdrc *ci)
 816 {
 817         struct ci_hdrc_cable *id, *vbus;
 818         int ret;
 819
 820         id = &ci->platdata->id_extcon;
 821         id->ci = ci;
 822         if (!IS_ERR_OR_NULL(id->edev)) {
 823                 ret = devm_extcon_register_notifier(ci->dev, id->edev,
 824                                                 EXTCON_USB_HOST, &id->nb);
 825                 if (ret < 0) {
 826                         dev_err(ci->dev, "register ID failed\n");
 827                         return ret;
 828                 }
 829         }
 830
 831         vbus = &ci->platdata->vbus_extcon;
 832         vbus->ci = ci;
 833         if (!IS_ERR_OR_NULL(vbus->edev)) {
 834                 ret = devm_extcon_register_notifier(ci->dev, vbus->edev,
 835                                                 EXTCON_USB, &vbus->nb);
 836                 if (ret < 0) {
 837                         dev_err(ci->dev, "register VBUS failed\n");
 838                         return ret;
 839                 }
 840         }
 841
 842         return 0;
 843 }
 844
 845 static DEFINE_IDA(ci_ida);
 846
 847 struct platform_device *ci_hdrc_add_device(struct device *dev,
 848                         struct resource *res, int nres,
 849                         struct ci_hdrc_platform_data *platdata)
 850 {
 851         struct platform_device *pdev;
 852         int id, ret;
 853
 854         ret = ci_get_platdata(dev, platdata);
 855         if (ret)
 856                 return ERR_PTR(ret);
 857
 858         id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
 859         if (id < 0)
 860                 return ERR_PTR(id);
 861
 862         pdev = platform_device_alloc("ci_hdrc", id);
 863         if (!pdev) {
 864                 ret = -ENOMEM;
 865                 goto put_id;
 866         }
 867
 868         pdev->dev.parent = dev;
 869         device_set_of_node_from_dev(&pdev->dev, dev);
 870
 871         ret = platform_device_add_resources(pdev, res, nres);
 872         if (ret)
 873                 goto err;
 874
 875         ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
 876         if (ret)
 877                 goto err;
 878
 879         ret = platform_device_add(pdev);
 880         if (ret)
 881                 goto err;
 882
 883         return pdev;
 884
 885 err:
 886         platform_device_put(pdev);
 887 put_id:
 888         ida_simple_remove(&ci_ida, id);
 889         return ERR_PTR(ret);
 890 }
 891 EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
 892
 893 void ci_hdrc_remove_device(struct platform_device *pdev)
 894 {
 895         int id = pdev->id;
 896         platform_device_unregister(pdev);
 897         ida_simple_remove(&ci_ida, id);
 898 }
 899 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
 900
 901 /**
 902  * ci_hdrc_query_available_role: get runtime available operation mode
 903  *
 904  * The glue layer can get current operation mode (host/peripheral/otg)
 905  * This function should be called after ci core device has created.
 906  *
 907  * @pdev: the platform device of ci core.
 908  *
 909  * Return runtime usb_dr_mode.
 910  */
 911 enum usb_dr_mode ci_hdrc_query_available_role(struct platform_device *pdev)
 912 {
 913         struct ci_hdrc *ci = platform_get_drvdata(pdev);
 914
 915         if (!ci)
 916                 return USB_DR_MODE_UNKNOWN;
 917         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])
 918                 return USB_DR_MODE_OTG;
 919         else if (ci->roles[CI_ROLE_HOST])
 920                 return USB_DR_MODE_HOST;
 921         else if (ci->roles[CI_ROLE_GADGET])
 922                 return USB_DR_MODE_PERIPHERAL;
 923         else
 924                 return USB_DR_MODE_UNKNOWN;
 925 }
 926 EXPORT_SYMBOL_GPL(ci_hdrc_query_available_role);
 927
 928 static inline void ci_role_destroy(struct ci_hdrc *ci)
 929 {
 930         ci_hdrc_gadget_destroy(ci);
 931         ci_hdrc_host_destroy(ci);
 932         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
 933                 ci_hdrc_otg_destroy(ci);
 934 }
 935
 936 static void ci_get_otg_capable(struct ci_hdrc *ci)
 937 {
 938         if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
 939                 ci->is_otg = false;
 940         else
 941                 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
 942                                 DCCPARAMS_DC | DCCPARAMS_HC)
 943                                         == (DCCPARAMS_DC | DCCPARAMS_HC));
 944         if (ci->is_otg) {
 945                 dev_dbg(ci->dev, "It is OTG capable controller\n");
 946                 /* Disable and clear all OTG irq */
 947                 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
 948                                                         OTGSC_INT_STATUS_BITS);
 949         }
 950 }
 951
 952 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
 953                           char *buf)
 954 {
 955         struct ci_hdrc *ci = dev_get_drvdata(dev);
 956
 957         if (ci->role != CI_ROLE_END)
 958                 return sprintf(buf, "%s\n", ci_role(ci)->name);
 959
 960         return 0;
 961 }
 962
 963 static ssize_t role_store(struct device *dev,
 964                 struct device_attribute *attr, const char *buf, size_t n)
 965 {
 966         struct ci_hdrc *ci = dev_get_drvdata(dev);
 967         enum ci_role role;
 968         int ret;
 969
 970         if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
 971                 dev_warn(dev, "Current configuration is not dual-role, quit\n");
 972                 return -EPERM;
 973         }
 974
 975         for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
 976                 if (!strncmp(buf, ci->roles[role]->name,
 977                              strlen(ci->roles[role]->name)))
 978                         break;
 979
 980         if (role == CI_ROLE_END || role == ci->role)
 981                 return -EINVAL;
 982
 983         pm_runtime_get_sync(dev);
 984         disable_irq(ci->irq);
 985         ci_role_stop(ci);
 986         ret = ci_role_start(ci, role);
 987         if (!ret && ci->role == CI_ROLE_GADGET)
 988                 ci_handle_vbus_change(ci);
 989         enable_irq(ci->irq);
 990         pm_runtime_put_sync(dev);
 991
 992         return (ret == 0) ? n : ret;
 993 }
 994 static DEVICE_ATTR_RW(role);
 995
 996 static struct attribute *ci_attrs[] = {
 997         &dev_attr_role.attr,
 998         NULL,
 999 };
1000 ATTRIBUTE_GROUPS(ci);
1001
1002 static int ci_hdrc_probe(struct platform_device *pdev)
1003 {
1004         struct device   *dev = &pdev->dev;
1005         struct ci_hdrc  *ci;
1006         struct resource *res;
1007         void __iomem    *base;
1008         int             ret;
1009         enum usb_dr_mode dr_mode;
1010
1011         if (!dev_get_platdata(dev)) {
1012                 dev_err(dev, "platform data missing\n");
1013                 return -ENODEV;
1014         }
1015
1016         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1017         base = devm_ioremap_resource(dev, res);
1018         if (IS_ERR(base))
1019                 return PTR_ERR(base);
1020
1021         ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
1022         if (!ci)
1023                 return -ENOMEM;
1024
1025         spin_lock_init(&ci->lock);
1026         ci->dev = dev;
1027         ci->platdata = dev_get_platdata(dev);
1028         ci->imx28_write_fix = !!(ci->platdata->flags &
1029                 CI_HDRC_IMX28_WRITE_FIX);
1030         ci->supports_runtime_pm = !!(ci->platdata->flags &
1031                 CI_HDRC_SUPPORTS_RUNTIME_PM);
1032         platform_set_drvdata(pdev, ci);
1033
1034         ret = hw_device_init(ci, base);
1035         if (ret < 0) {
1036                 dev_err(dev, "can't initialize hardware\n");
1037                 return -ENODEV;
1038         }
1039
1040         ret = ci_ulpi_init(ci);
1041         if (ret)
1042                 return ret;
1043
1044         if (ci->platdata->phy) {
1045                 ci->phy = ci->platdata->phy;
1046         } else if (ci->platdata->usb_phy) {
1047                 ci->usb_phy = ci->platdata->usb_phy;
1048         } else {
1049                 /* Look for a generic PHY first */
1050                 ci->phy = devm_phy_get(dev->parent, "usb-phy");
1051
1052                 if (PTR_ERR(ci->phy) == -EPROBE_DEFER) {
1053                         ret = -EPROBE_DEFER;
1054                         goto ulpi_exit;
1055                 } else if (IS_ERR(ci->phy)) {
1056                         ci->phy = NULL;
1057                 }
1058
1059                 /* Look for a legacy USB PHY from device-tree next */
1060                 if (!ci->phy) {
1061                         ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent,
1062                                                                   "phys", 0);
1063
1064                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1065                                 ret = -EPROBE_DEFER;
1066                                 goto ulpi_exit;
1067                         } else if (IS_ERR(ci->usb_phy)) {
1068                                 ci->usb_phy = NULL;
1069                         }
1070                 }
1071
1072                 /* Look for any registered legacy USB PHY as last resort */
1073                 if (!ci->phy && !ci->usb_phy) {
1074                         ci->usb_phy = devm_usb_get_phy(dev->parent,
1075                                                        USB_PHY_TYPE_USB2);
1076
1077                         if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1078                                 ret = -EPROBE_DEFER;
1079                                 goto ulpi_exit;
1080                         } else if (IS_ERR(ci->usb_phy)) {
1081                                 ci->usb_phy = NULL;
1082                         }
1083                 }
1084
1085                 /* No USB PHY was found in the end */
1086                 if (!ci->phy && !ci->usb_phy) {
1087                         ret = -ENXIO;
1088                         goto ulpi_exit;
1089                 }
1090         }
1091
1092         ret = ci_usb_phy_init(ci);
1093         if (ret) {
1094                 dev_err(dev, "unable to init phy: %d\n", ret);
1095                 return ret;
1096         }
1097
1098         ci->hw_bank.phys = res->start;
1099
1100         ci->irq = platform_get_irq(pdev, 0);
1101         if (ci->irq < 0) {
1102                 ret = ci->irq;
1103                 goto deinit_phy;
1104         }
1105
1106         ci_get_otg_capable(ci);
1107
1108         dr_mode = ci->platdata->dr_mode;
1109         /* initialize role(s) before the interrupt is requested */
1110         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
1111                 ret = ci_hdrc_host_init(ci);
1112                 if (ret) {
1113                         if (ret == -ENXIO)
1114                                 dev_info(dev, "doesn't support host\n");
1115                         else
1116                                 goto deinit_phy;
1117                 }
1118         }
1119
1120         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
1121                 ret = ci_hdrc_gadget_init(ci);
1122                 if (ret) {
1123                         if (ret == -ENXIO)
1124                                 dev_info(dev, "doesn't support gadget\n");
1125                         else
1126                                 goto deinit_host;
1127                 }
1128         }
1129
1130         if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
1131                 dev_err(dev, "no supported roles\n");
1132                 ret = -ENODEV;
1133                 goto deinit_gadget;
1134         }
1135
1136         if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
1137                 ret = ci_hdrc_otg_init(ci);
1138                 if (ret) {
1139                         dev_err(dev, "init otg fails, ret = %d\n", ret);
1140                         goto deinit_gadget;
1141                 }
1142         }
1143
1144         if (ci_role_switch.fwnode) {
1145                 ci_role_switch.driver_data = ci;
1146                 ci->role_switch = usb_role_switch_register(dev,
1147                                         &ci_role_switch);
1148                 if (IS_ERR(ci->role_switch)) {
1149                         ret = PTR_ERR(ci->role_switch);
1150                         goto deinit_otg;
1151                 }
1152         }
1153
1154         if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
1155                 if (ci->is_otg) {
1156                         ci->role = ci_otg_role(ci);
1157                         /* Enable ID change irq */
1158                         hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
1159                 } else {
1160                         /*
1161                          * If the controller is not OTG capable, but support
1162                          * role switch, the defalt role is gadget, and the
1163                          * user can switch it through debugfs.
1164                          */
1165                         ci->role = CI_ROLE_GADGET;
1166                 }
1167         } else {
1168                 ci->role = ci->roles[CI_ROLE_HOST]
1169                         ? CI_ROLE_HOST
1170                         : CI_ROLE_GADGET;
1171         }
1172
1173         if (!ci_otg_is_fsm_mode(ci)) {
1174                 /* only update vbus status for peripheral */
1175                 if (ci->role == CI_ROLE_GADGET) {
1176                         /* Pull down DP for possible charger detection */
1177                         hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1178                         ci_handle_vbus_change(ci);
1179                 }
1180
1181                 ret = ci_role_start(ci, ci->role);
1182                 if (ret) {
1183                         dev_err(dev, "can't start %s role\n",
1184                                                 ci_role(ci)->name);
1185                         goto stop;
1186                 }
1187         }
1188
1189         ret = devm_request_irq(dev, ci->irq, ci_irq_handler, IRQF_SHARED,
1190                         ci->platdata->name, ci);
1191         if (ret)
1192                 goto stop;
1193
1194         ret = ci_extcon_register(ci);
1195         if (ret)
1196                 goto stop;
1197
1198         if (ci->supports_runtime_pm) {
1199                 pm_runtime_set_active(&pdev->dev);
1200                 pm_runtime_enable(&pdev->dev);
1201                 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
1202                 pm_runtime_mark_last_busy(ci->dev);
1203                 pm_runtime_use_autosuspend(&pdev->dev);
1204         }
1205
1206         if (ci_otg_is_fsm_mode(ci))
1207                 ci_hdrc_otg_fsm_start(ci);
1208
1209         device_set_wakeup_capable(&pdev->dev, true);
1210         dbg_create_files(ci);
1211
1212         return 0;
1213
1214 stop:
1215         if (ci->role_switch)
1216                 usb_role_switch_unregister(ci->role_switch);
1217 deinit_otg:
1218         if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
1219                 ci_hdrc_otg_destroy(ci);
1220 deinit_gadget:
1221         ci_hdrc_gadget_destroy(ci);
1222 deinit_host:
1223         ci_hdrc_host_destroy(ci);
1224 deinit_phy:
1225         ci_usb_phy_exit(ci);
1226 ulpi_exit:
1227         ci_ulpi_exit(ci);
1228
1229         return ret;
1230 }
1231
1232 static int ci_hdrc_remove(struct platform_device *pdev)
1233 {
1234         struct ci_hdrc *ci = platform_get_drvdata(pdev);
1235
1236         if (ci->role_switch)
1237                 usb_role_switch_unregister(ci->role_switch);
1238
1239         if (ci->supports_runtime_pm) {
1240                 pm_runtime_get_sync(&pdev->dev);
1241                 pm_runtime_disable(&pdev->dev);
1242                 pm_runtime_put_noidle(&pdev->dev);
1243         }
1244
1245         dbg_remove_files(ci);
1246         ci_role_destroy(ci);
1247         ci_hdrc_enter_lpm(ci, true);
1248         ci_usb_phy_exit(ci);
1249         ci_ulpi_exit(ci);
1250
1251         return 0;
1252 }
1253
1254 #ifdef CONFIG_PM
1255 /* Prepare wakeup by SRP before suspend */
1256 static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
1257 {
1258         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1259                                 !hw_read_otgsc(ci, OTGSC_ID)) {
1260                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
1261                                                                 PORTSC_PP);
1262                 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
1263                                                                 PORTSC_WKCN);
1264         }
1265 }
1266
1267 /* Handle SRP when wakeup by data pulse */
1268 static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
1269 {
1270         if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1271                 (ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
1272                 if (!hw_read_otgsc(ci, OTGSC_ID)) {
1273                         ci->fsm.a_srp_det = 1;
1274                         ci->fsm.a_bus_drop = 0;
1275                 } else {
1276                         ci->fsm.id = 1;
1277                 }
1278                 ci_otg_queue_work(ci);
1279         }
1280 }
1281
1282 static void ci_controller_suspend(struct ci_hdrc *ci)
1283 {
1284         disable_irq(ci->irq);
1285         ci_hdrc_enter_lpm(ci, true);
1286         if (ci->platdata->phy_clkgate_delay_us)
1287                 usleep_range(ci->platdata->phy_clkgate_delay_us,
1288                              ci->platdata->phy_clkgate_delay_us + 50);
1289         usb_phy_set_suspend(ci->usb_phy, 1);
1290         ci->in_lpm = true;
1291         enable_irq(ci->irq);
1292 }
1293
1294 /*
1295  * Handle the wakeup interrupt triggered by extcon connector
1296  * We need to call ci_irq again for extcon since the first
1297  * interrupt (wakeup int) only let the controller be out of
1298  * low power mode, but not handle any interrupts.
1299  */
1300 static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
1301 {
1302         struct ci_hdrc_cable *cable_id, *cable_vbus;
1303         u32 otgsc = hw_read_otgsc(ci, ~0);
1304
1305         cable_id = &ci->platdata->id_extcon;
1306         cable_vbus = &ci->platdata->vbus_extcon;
1307
1308         if (!IS_ERR(cable_id->edev) && ci->is_otg &&
1309                 (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS))
1310                 ci_irq(ci);
1311
1312         if (!IS_ERR(cable_vbus->edev) && ci->is_otg &&
1313                 (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS))
1314                 ci_irq(ci);
1315 }
1316
1317 static int ci_controller_resume(struct device *dev)
1318 {
1319         struct ci_hdrc *ci = dev_get_drvdata(dev);
1320         int ret;
1321
1322         dev_dbg(dev, "at %s\n", __func__);
1323
1324         if (!ci->in_lpm) {
1325                 WARN_ON(1);
1326                 return 0;
1327         }
1328
1329         ci_hdrc_enter_lpm(ci, false);
1330
1331         ret = ci_ulpi_resume(ci);
1332         if (ret)
1333                 return ret;
1334
1335         if (ci->usb_phy) {
1336                 usb_phy_set_suspend(ci->usb_phy, 0);
1337                 usb_phy_set_wakeup(ci->usb_phy, false);
1338                 hw_wait_phy_stable();
1339         }
1340
1341         ci->in_lpm = false;
1342         if (ci->wakeup_int) {
1343                 ci->wakeup_int = false;
1344                 pm_runtime_mark_last_busy(ci->dev);
1345                 pm_runtime_put_autosuspend(ci->dev);
1346                 enable_irq(ci->irq);
1347                 if (ci_otg_is_fsm_mode(ci))
1348                         ci_otg_fsm_wakeup_by_srp(ci);
1349                 ci_extcon_wakeup_int(ci);
1350         }
1351
1352         return 0;
1353 }
1354
1355 #ifdef CONFIG_PM_SLEEP
1356 static int ci_suspend(struct device *dev)
1357 {
1358         struct ci_hdrc *ci = dev_get_drvdata(dev);
1359
1360         if (ci->wq)
1361                 flush_workqueue(ci->wq);
1362         /*
1363          * Controller needs to be active during suspend, otherwise the core
1364          * may run resume when the parent is at suspend if other driver's
1365          * suspend fails, it occurs before parent's suspend has not started,
1366          * but the core suspend has finished.
1367          */
1368         if (ci->in_lpm)
1369                 pm_runtime_resume(dev);
1370
1371         if (ci->in_lpm) {
1372                 WARN_ON(1);
1373                 return 0;
1374         }
1375
1376         if (device_may_wakeup(dev)) {
1377                 if (ci_otg_is_fsm_mode(ci))
1378                         ci_otg_fsm_suspend_for_srp(ci);
1379
1380                 usb_phy_set_wakeup(ci->usb_phy, true);
1381                 enable_irq_wake(ci->irq);
1382         }
1383
1384         ci_controller_suspend(ci);
1385
1386         return 0;
1387 }
1388
1389 static int ci_resume(struct device *dev)
1390 {
1391         struct ci_hdrc *ci = dev_get_drvdata(dev);
1392         int ret;
1393
1394         if (device_may_wakeup(dev))
1395                 disable_irq_wake(ci->irq);
1396
1397         ret = ci_controller_resume(dev);
1398         if (ret)
1399                 return ret;
1400
1401         if (ci->supports_runtime_pm) {
1402                 pm_runtime_disable(dev);
1403                 pm_runtime_set_active(dev);
1404                 pm_runtime_enable(dev);
1405         }
1406
1407         return ret;
1408 }
1409 #endif /* CONFIG_PM_SLEEP */
1410
1411 static int ci_runtime_suspend(struct device *dev)
1412 {
1413         struct ci_hdrc *ci = dev_get_drvdata(dev);
1414
1415         dev_dbg(dev, "at %s\n", __func__);
1416
1417         if (ci->in_lpm) {
1418                 WARN_ON(1);
1419                 return 0;
1420         }
1421
1422         if (ci_otg_is_fsm_mode(ci))
1423                 ci_otg_fsm_suspend_for_srp(ci);
1424
1425         usb_phy_set_wakeup(ci->usb_phy, true);
1426         ci_controller_suspend(ci);
1427
1428         return 0;
1429 }
1430
1431 static int ci_runtime_resume(struct device *dev)
1432 {
1433         return ci_controller_resume(dev);
1434 }
1435
1436 #endif /* CONFIG_PM */
1437 static const struct dev_pm_ops ci_pm_ops = {
1438         SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
1439         SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
1440 };
1441
1442 static struct platform_driver ci_hdrc_driver = {
1443         .probe  = ci_hdrc_probe,
1444         .remove = ci_hdrc_remove,
1445         .driver = {
1446                 .name   = "ci_hdrc",
1447                 .pm     = &ci_pm_ops,
1448                 .dev_groups = ci_groups,
1449         },
1450 };
1451
1452 static int __init ci_hdrc_platform_register(void)
1453 {
1454         ci_hdrc_host_driver_init();
1455         return platform_driver_register(&ci_hdrc_driver);
1456 }
1457 module_init(ci_hdrc_platform_register);
1458
1459 static void __exit ci_hdrc_platform_unregister(void)
1460 {
1461         platform_driver_unregister(&ci_hdrc_driver);
1462 }
1463 module_exit(ci_hdrc_platform_unregister);
1464
1465 MODULE_ALIAS("platform:ci_hdrc");
1466 MODULE_LICENSE("GPL v2");
1467 MODULE_AUTHOR("David Lopo <[email protected]>");
1468 MODULE_DESCRIPTION("ChipIdea HDRC Driver");