drivers/usb/dwc2/core_intr.c

   1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
   2 /*
   3  * core_intr.c - DesignWare HS OTG Controller common interrupt handling
   4  *
   5  * Copyright (C) 2004-2013 Synopsys, Inc.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The names of the above-listed copyright holders may not be used
  17  *    to endorse or promote products derived from this software without
  18  *    specific prior written permission.
  19  *
  20  * ALTERNATIVELY, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") as published by the Free Software
  22  * Foundation; either version 2 of the License, or (at your option) any
  23  * later version.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  26  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  27  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  29  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  30  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  31  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  32  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 /*
  39  * This file contains the common interrupt handlers
  40  */
  41 #include <linux/kernel.h>
  42 #include <linux/module.h>
  43 #include <linux/moduleparam.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/dma-mapping.h>
  47 #include <linux/io.h>
  48 #include <linux/slab.h>
  49 #include <linux/usb.h>
  50
  51 #include <linux/usb/hcd.h>
  52 #include <linux/usb/ch11.h>
  53
  54 #include "core.h"
  55 #include "hcd.h"
  56
  57 static const char *dwc2_op_state_str(struct dwc2_hsotg *hsotg)
  58 {
  59         switch (hsotg->op_state) {
  60         case OTG_STATE_A_HOST:
  61                 return "a_host";
  62         case OTG_STATE_A_SUSPEND:
  63                 return "a_suspend";
  64         case OTG_STATE_A_PERIPHERAL:
  65                 return "a_peripheral";
  66         case OTG_STATE_B_PERIPHERAL:
  67                 return "b_peripheral";
  68         case OTG_STATE_B_HOST:
  69                 return "b_host";
  70         default:
  71                 return "unknown";
  72         }
  73 }
  74
  75 /**
  76  * dwc2_handle_usb_port_intr - handles OTG PRTINT interrupts.
  77  * When the PRTINT interrupt fires, there are certain status bits in the Host
  78  * Port that needs to get cleared.
  79  *
  80  * @hsotg: Programming view of DWC_otg controller
  81  */
  82 static void dwc2_handle_usb_port_intr(struct dwc2_hsotg *hsotg)
  83 {
  84         u32 hprt0 = dwc2_readl(hsotg, HPRT0);
  85
  86         if (hprt0 & HPRT0_ENACHG) {
  87                 hprt0 &= ~HPRT0_ENA;
  88                 dwc2_writel(hsotg, hprt0, HPRT0);
  89         }
  90 }
  91
  92 /**
  93  * dwc2_handle_mode_mismatch_intr() - Logs a mode mismatch warning message
  94  *
  95  * @hsotg: Programming view of DWC_otg controller
  96  */
  97 static void dwc2_handle_mode_mismatch_intr(struct dwc2_hsotg *hsotg)
  98 {
  99         /* Clear interrupt */
 100         dwc2_writel(hsotg, GINTSTS_MODEMIS, GINTSTS);
 101
 102         dev_warn(hsotg->dev, "Mode Mismatch Interrupt: currently in %s mode\n",
 103                  dwc2_is_host_mode(hsotg) ? "Host" : "Device");
 104 }
 105
 106 /**
 107  * dwc2_handle_otg_intr() - Handles the OTG Interrupts. It reads the OTG
 108  * Interrupt Register (GOTGINT) to determine what interrupt has occurred.
 109  *
 110  * @hsotg: Programming view of DWC_otg controller
 111  */
 112 static void dwc2_handle_otg_intr(struct dwc2_hsotg *hsotg)
 113 {
 114         u32 gotgint;
 115         u32 gotgctl;
 116         u32 gintmsk;
 117
 118         gotgint = dwc2_readl(hsotg, GOTGINT);
 119         gotgctl = dwc2_readl(hsotg, GOTGCTL);
 120         dev_dbg(hsotg->dev, "++OTG Interrupt gotgint=%0x [%s]\n", gotgint,
 121                 dwc2_op_state_str(hsotg));
 122
 123         if (gotgint & GOTGINT_SES_END_DET) {
 124                 dev_dbg(hsotg->dev,
 125                         " ++OTG Interrupt: Session End Detected++ (%s)\n",
 126                         dwc2_op_state_str(hsotg));
 127                 gotgctl = dwc2_readl(hsotg, GOTGCTL);
 128
 129                 if (dwc2_is_device_mode(hsotg))
 130                         dwc2_hsotg_disconnect(hsotg);
 131
 132                 if (hsotg->op_state == OTG_STATE_B_HOST) {
 133                         hsotg->op_state = OTG_STATE_B_PERIPHERAL;
 134                 } else {
 135                         /*
 136                          * If not B_HOST and Device HNP still set, HNP did
 137                          * not succeed!
 138                          */
 139                         if (gotgctl & GOTGCTL_DEVHNPEN) {
 140                                 dev_dbg(hsotg->dev, "Session End Detected\n");
 141                                 dev_err(hsotg->dev,
 142                                         "Device Not Connected/Responding!\n");
 143                         }
 144
 145                         /*
 146                          * If Session End Detected the B-Cable has been
 147                          * disconnected
 148                          */
 149                         /* Reset to a clean state */
 150                         hsotg->lx_state = DWC2_L0;
 151                 }
 152
 153                 gotgctl = dwc2_readl(hsotg, GOTGCTL);
 154                 gotgctl &= ~GOTGCTL_DEVHNPEN;
 155                 dwc2_writel(hsotg, gotgctl, GOTGCTL);
 156         }
 157
 158         if (gotgint & GOTGINT_SES_REQ_SUC_STS_CHNG) {
 159                 dev_dbg(hsotg->dev,
 160                         " ++OTG Interrupt: Session Request Success Status Change++\n");
 161                 gotgctl = dwc2_readl(hsotg, GOTGCTL);
 162                 if (gotgctl & GOTGCTL_SESREQSCS) {
 163                         if (hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS &&
 164                             hsotg->params.i2c_enable) {
 165                                 hsotg->srp_success = 1;
 166                         } else {
 167                                 /* Clear Session Request */
 168                                 gotgctl = dwc2_readl(hsotg, GOTGCTL);
 169                                 gotgctl &= ~GOTGCTL_SESREQ;
 170                                 dwc2_writel(hsotg, gotgctl, GOTGCTL);
 171                         }
 172                 }
 173         }
 174
 175         if (gotgint & GOTGINT_HST_NEG_SUC_STS_CHNG) {
 176                 /*
 177                  * Print statements during the HNP interrupt handling
 178                  * can cause it to fail
 179                  */
 180                 gotgctl = dwc2_readl(hsotg, GOTGCTL);
 181                 /*
 182                  * WA for 3.00a- HW is not setting cur_mode, even sometimes
 183                  * this does not help
 184                  */
 185                 if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a)
 186                         udelay(100);
 187                 if (gotgctl & GOTGCTL_HSTNEGSCS) {
 188                         if (dwc2_is_host_mode(hsotg)) {
 189                                 hsotg->op_state = OTG_STATE_B_HOST;
 190                                 /*
 191                                  * Need to disable SOF interrupt immediately.
 192                                  * When switching from device to host, the PCD
 193                                  * interrupt handler won't handle the interrupt
 194                                  * if host mode is already set. The HCD
 195                                  * interrupt handler won't get called if the
 196                                  * HCD state is HALT. This means that the
 197                                  * interrupt does not get handled and Linux
 198                                  * complains loudly.
 199                                  */
 200                                 gintmsk = dwc2_readl(hsotg, GINTMSK);
 201                                 gintmsk &= ~GINTSTS_SOF;
 202                                 dwc2_writel(hsotg, gintmsk, GINTMSK);
 203
 204                                 /*
 205                                  * Call callback function with spin lock
 206                                  * released
 207                                  */
 208                                 spin_unlock(&hsotg->lock);
 209
 210                                 /* Initialize the Core for Host mode */
 211                                 dwc2_hcd_start(hsotg);
 212                                 spin_lock(&hsotg->lock);
 213                                 hsotg->op_state = OTG_STATE_B_HOST;
 214                         }
 215                 } else {
 216                         gotgctl = dwc2_readl(hsotg, GOTGCTL);
 217                         gotgctl &= ~(GOTGCTL_HNPREQ | GOTGCTL_DEVHNPEN);
 218                         dwc2_writel(hsotg, gotgctl, GOTGCTL);
 219                         dev_dbg(hsotg->dev, "HNP Failed\n");
 220                         dev_err(hsotg->dev,
 221                                 "Device Not Connected/Responding\n");
 222                 }
 223         }
 224
 225         if (gotgint & GOTGINT_HST_NEG_DET) {
 226                 /*
 227                  * The disconnect interrupt is set at the same time as
 228                  * Host Negotiation Detected. During the mode switch all
 229                  * interrupts are cleared so the disconnect interrupt
 230                  * handler will not get executed.
 231                  */
 232                 dev_dbg(hsotg->dev,
 233                         " ++OTG Interrupt: Host Negotiation Detected++ (%s)\n",
 234                         (dwc2_is_host_mode(hsotg) ? "Host" : "Device"));
 235                 if (dwc2_is_device_mode(hsotg)) {
 236                         dev_dbg(hsotg->dev, "a_suspend->a_peripheral (%d)\n",
 237                                 hsotg->op_state);
 238                         spin_unlock(&hsotg->lock);
 239                         dwc2_hcd_disconnect(hsotg, false);
 240                         spin_lock(&hsotg->lock);
 241                         hsotg->op_state = OTG_STATE_A_PERIPHERAL;
 242                 } else {
 243                         /* Need to disable SOF interrupt immediately */
 244                         gintmsk = dwc2_readl(hsotg, GINTMSK);
 245                         gintmsk &= ~GINTSTS_SOF;
 246                         dwc2_writel(hsotg, gintmsk, GINTMSK);
 247                         spin_unlock(&hsotg->lock);
 248                         dwc2_hcd_start(hsotg);
 249                         spin_lock(&hsotg->lock);
 250                         hsotg->op_state = OTG_STATE_A_HOST;
 251                 }
 252         }
 253
 254         if (gotgint & GOTGINT_A_DEV_TOUT_CHG)
 255                 dev_dbg(hsotg->dev,
 256                         " ++OTG Interrupt: A-Device Timeout Change++\n");
 257         if (gotgint & GOTGINT_DBNCE_DONE)
 258                 dev_dbg(hsotg->dev, " ++OTG Interrupt: Debounce Done++\n");
 259
 260         /* Clear GOTGINT */
 261         dwc2_writel(hsotg, gotgint, GOTGINT);
 262 }
 263
 264 /**
 265  * dwc2_handle_conn_id_status_change_intr() - Handles the Connector ID Status
 266  * Change Interrupt
 267  *
 268  * @hsotg: Programming view of DWC_otg controller
 269  *
 270  * Reads the OTG Interrupt Register (GOTCTL) to determine whether this is a
 271  * Device to Host Mode transition or a Host to Device Mode transition. This only
 272  * occurs when the cable is connected/removed from the PHY connector.
 273  */
 274 static void dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg *hsotg)
 275 {
 276         u32 gintmsk;
 277
 278         /* Clear interrupt */
 279         dwc2_writel(hsotg, GINTSTS_CONIDSTSCHNG, GINTSTS);
 280
 281         /* Need to disable SOF interrupt immediately */
 282         gintmsk = dwc2_readl(hsotg, GINTMSK);
 283         gintmsk &= ~GINTSTS_SOF;
 284         dwc2_writel(hsotg, gintmsk, GINTMSK);
 285
 286         dev_dbg(hsotg->dev, " ++Connector ID Status Change Interrupt++  (%s)\n",
 287                 dwc2_is_host_mode(hsotg) ? "Host" : "Device");
 288
 289         /*
 290          * Need to schedule a work, as there are possible DELAY function calls.
 291          */
 292         if (hsotg->wq_otg)
 293                 queue_work(hsotg->wq_otg, &hsotg->wf_otg);
 294 }
 295
 296 /**
 297  * dwc2_handle_session_req_intr() - This interrupt indicates that a device is
 298  * initiating the Session Request Protocol to request the host to turn on bus
 299  * power so a new session can begin
 300  *
 301  * @hsotg: Programming view of DWC_otg controller
 302  *
 303  * This handler responds by turning on bus power. If the DWC_otg controller is
 304  * in low power mode, this handler brings the controller out of low power mode
 305  * before turning on bus power.
 306  */
 307 static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)
 308 {
 309         int ret;
 310         u32 hprt0;
 311
 312         /* Clear interrupt */
 313         dwc2_writel(hsotg, GINTSTS_SESSREQINT, GINTSTS);
 314
 315         dev_dbg(hsotg->dev, "Session request interrupt - lx_state=%d\n",
 316                 hsotg->lx_state);
 317
 318         if (dwc2_is_device_mode(hsotg)) {
 319                 if (hsotg->lx_state == DWC2_L2) {
 320                         if (hsotg->in_ppd) {
 321                                 ret = dwc2_exit_partial_power_down(hsotg, 0,
 322                                                                    true);
 323                                 if (ret)
 324                                         dev_err(hsotg->dev,
 325                                                 "exit power_down failed\n");
 326                         }
 327
 328                         /* Exit gadget mode clock gating. */
 329                         if (hsotg->params.power_down ==
 330                             DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
 331                                 dwc2_gadget_exit_clock_gating(hsotg, 0);
 332                 }
 333
 334                 /*
 335                  * Report disconnect if there is any previous session
 336                  * established
 337                  */
 338                 dwc2_hsotg_disconnect(hsotg);
 339         } else {
 340                 /* Turn on the port power bit. */
 341                 hprt0 = dwc2_read_hprt0(hsotg);
 342                 hprt0 |= HPRT0_PWR;
 343                 dwc2_writel(hsotg, hprt0, HPRT0);
 344                 /* Connect hcd after port power is set. */
 345                 dwc2_hcd_connect(hsotg);
 346         }
 347 }
 348
 349 /**
 350  * dwc2_wakeup_from_lpm_l1 - Exit the device from LPM L1 state
 351  *
 352  * @hsotg: Programming view of DWC_otg controller
 353  *
 354  */
 355 static void dwc2_wakeup_from_lpm_l1(struct dwc2_hsotg *hsotg)
 356 {
 357         u32 glpmcfg;
 358         u32 i = 0;
 359
 360         if (hsotg->lx_state != DWC2_L1) {
 361                 dev_err(hsotg->dev, "Core isn't in DWC2_L1 state\n");
 362                 return;
 363         }
 364
 365         glpmcfg = dwc2_readl(hsotg, GLPMCFG);
 366         if (dwc2_is_device_mode(hsotg)) {
 367                 dev_dbg(hsotg->dev, "Exit from L1 state\n");
 368                 glpmcfg &= ~GLPMCFG_ENBLSLPM;
 369                 glpmcfg &= ~GLPMCFG_HIRD_THRES_EN;
 370                 dwc2_writel(hsotg, glpmcfg, GLPMCFG);
 371
 372                 do {
 373                         glpmcfg = dwc2_readl(hsotg, GLPMCFG);
 374
 375                         if (!(glpmcfg & (GLPMCFG_COREL1RES_MASK |
 376                                          GLPMCFG_L1RESUMEOK | GLPMCFG_SLPSTS)))
 377                                 break;
 378
 379                         udelay(1);
 380                 } while (++i < 200);
 381
 382                 if (i == 200) {
 383                         dev_err(hsotg->dev, "Failed to exit L1 sleep state in 200us.\n");
 384                         return;
 385                 }
 386                 dwc2_gadget_init_lpm(hsotg);
 387         } else {
 388                 /* TODO */
 389                 dev_err(hsotg->dev, "Host side LPM is not supported.\n");
 390                 return;
 391         }
 392
 393         /* Change to L0 state */
 394         hsotg->lx_state = DWC2_L0;
 395
 396         /* Inform gadget to exit from L1 */
 397         call_gadget(hsotg, resume);
 398 }
 399
 400 /*
 401  * This interrupt indicates that the DWC_otg controller has detected a
 402  * resume or remote wakeup sequence. If the DWC_otg controller is in
 403  * low power mode, the handler must brings the controller out of low
 404  * power mode. The controller automatically begins resume signaling.
 405  * The handler schedules a time to stop resume signaling.
 406  */
 407 static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
 408 {
 409         int ret;
 410
 411         /* Clear interrupt */
 412         dwc2_writel(hsotg, GINTSTS_WKUPINT, GINTSTS);
 413
 414         dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");
 415         dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
 416
 417         if (hsotg->lx_state == DWC2_L1) {
 418                 dwc2_wakeup_from_lpm_l1(hsotg);
 419                 return;
 420         }
 421
 422         if (dwc2_is_device_mode(hsotg)) {
 423                 dev_dbg(hsotg->dev, "DSTS=0x%0x\n",
 424                         dwc2_readl(hsotg, DSTS));
 425                 if (hsotg->lx_state == DWC2_L2) {
 426                         if (hsotg->in_ppd) {
 427                                 u32 dctl = dwc2_readl(hsotg, DCTL);
 428                                 /* Clear Remote Wakeup Signaling */
 429                                 dctl &= ~DCTL_RMTWKUPSIG;
 430                                 dwc2_writel(hsotg, dctl, DCTL);
 431                                 ret = dwc2_exit_partial_power_down(hsotg, 1,
 432                                                                    true);
 433                                 if (ret)
 434                                         dev_err(hsotg->dev,
 435                                                 "exit partial_power_down failed\n");
 436                                 call_gadget(hsotg, resume);
 437                         }
 438
 439                         /* Exit gadget mode clock gating. */
 440                         if (hsotg->params.power_down ==
 441                             DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
 442                                 dwc2_gadget_exit_clock_gating(hsotg, 0);
 443                 } else {
 444                         /* Change to L0 state */
 445                         hsotg->lx_state = DWC2_L0;
 446                 }
 447         } else {
 448                 if (hsotg->lx_state == DWC2_L2) {
 449                         if (hsotg->in_ppd) {
 450                                 ret = dwc2_exit_partial_power_down(hsotg, 1,
 451                                                                    true);
 452                                 if (ret)
 453                                         dev_err(hsotg->dev,
 454                                                 "exit partial_power_down failed\n");
 455                         }
 456
 457                         if (hsotg->params.power_down ==
 458                             DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
 459                                 dwc2_host_exit_clock_gating(hsotg, 1);
 460
 461                         /*
 462                          * If we've got this quirk then the PHY is stuck upon
 463                          * wakeup.  Assert reset.  This will propagate out and
 464                          * eventually we'll re-enumerate the device.  Not great
 465                          * but the best we can do.  We can't call phy_reset()
 466                          * at interrupt time but there's no hurry, so we'll
 467                          * schedule it for later.
 468                          */
 469                         if (hsotg->reset_phy_on_wake)
 470                                 dwc2_host_schedule_phy_reset(hsotg);
 471
 472                         mod_timer(&hsotg->wkp_timer,
 473                                   jiffies + msecs_to_jiffies(71));
 474                 } else {
 475                         /* Change to L0 state */
 476                         hsotg->lx_state = DWC2_L0;
 477                 }
 478         }
 479 }
 480
 481 /*
 482  * This interrupt indicates that a device has been disconnected from the
 483  * root port
 484  */
 485 static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg)
 486 {
 487         dwc2_writel(hsotg, GINTSTS_DISCONNINT, GINTSTS);
 488
 489         dev_dbg(hsotg->dev, "++Disconnect Detected Interrupt++ (%s) %s\n",
 490                 dwc2_is_host_mode(hsotg) ? "Host" : "Device",
 491                 dwc2_op_state_str(hsotg));
 492
 493         if (hsotg->op_state == OTG_STATE_A_HOST)
 494                 dwc2_hcd_disconnect(hsotg, false);
 495 }
 496
 497 /*
 498  * This interrupt indicates that SUSPEND state has been detected on the USB.
 499  *
 500  * For HNP the USB Suspend interrupt signals the change from "a_peripheral"
 501  * to "a_host".
 502  *
 503  * When power management is enabled the core will be put in low power mode.
 504  */
 505 static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
 506 {
 507         u32 dsts;
 508         int ret;
 509
 510         /* Clear interrupt */
 511         dwc2_writel(hsotg, GINTSTS_USBSUSP, GINTSTS);
 512
 513         dev_dbg(hsotg->dev, "USB SUSPEND\n");
 514
 515         if (dwc2_is_device_mode(hsotg)) {
 516                 /*
 517                  * Check the Device status register to determine if the Suspend
 518                  * state is active
 519                  */
 520                 dsts = dwc2_readl(hsotg, DSTS);
 521                 dev_dbg(hsotg->dev, "%s: DSTS=0x%0x\n", __func__, dsts);
 522                 dev_dbg(hsotg->dev,
 523                         "DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d HWCFG4.Hibernation=%d\n",
 524                         !!(dsts & DSTS_SUSPSTS),
 525                         hsotg->hw_params.power_optimized,
 526                         hsotg->hw_params.hibernation);
 527
 528                 /* Ignore suspend request before enumeration */
 529                 if (!dwc2_is_device_connected(hsotg)) {
 530                         dev_dbg(hsotg->dev,
 531                                 "ignore suspend request before enumeration\n");
 532                         return;
 533                 }
 534                 if (dsts & DSTS_SUSPSTS) {
 535                         switch (hsotg->params.power_down) {
 536                         case DWC2_POWER_DOWN_PARAM_PARTIAL:
 537                                 ret = dwc2_enter_partial_power_down(hsotg);
 538                                 if (ret)
 539                                         dev_err(hsotg->dev,
 540                                                 "enter partial_power_down failed\n");
 541
 542                                 udelay(100);
 543
 544                                 /* Ask phy to be suspended */
 545                                 if (!IS_ERR_OR_NULL(hsotg->uphy))
 546                                         usb_phy_set_suspend(hsotg->uphy, true);
 547                                 break;
 548                         case DWC2_POWER_DOWN_PARAM_HIBERNATION:
 549                                 ret = dwc2_enter_hibernation(hsotg, 0);
 550                                 if (ret)
 551                                         dev_err(hsotg->dev,
 552                                                 "enter hibernation failed\n");
 553                                 break;
 554                         case DWC2_POWER_DOWN_PARAM_NONE:
 555                                 /*
 556                                  * If neither hibernation nor partial power down are supported,
 557                                  * clock gating is used to save power.
 558                                  */
 559                                 dwc2_gadget_enter_clock_gating(hsotg);
 560                         }
 561
 562                         /*
 563                          * Change to L2 (suspend) state before releasing
 564                          * spinlock
 565                          */
 566                         hsotg->lx_state = DWC2_L2;
 567
 568                         /* Call gadget suspend callback */
 569                         call_gadget(hsotg, suspend);
 570                 }
 571         } else {
 572                 if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) {
 573                         dev_dbg(hsotg->dev, "a_peripheral->a_host\n");
 574
 575                         /* Change to L2 (suspend) state */
 576                         hsotg->lx_state = DWC2_L2;
 577                         /* Clear the a_peripheral flag, back to a_host */
 578                         spin_unlock(&hsotg->lock);
 579                         dwc2_hcd_start(hsotg);
 580                         spin_lock(&hsotg->lock);
 581                         hsotg->op_state = OTG_STATE_A_HOST;
 582                 }
 583         }
 584 }
 585
 586 /**
 587  * dwc2_handle_lpm_intr - GINTSTS_LPMTRANRCVD Interrupt handler
 588  *
 589  * @hsotg: Programming view of DWC_otg controller
 590  *
 591  */
 592 static void dwc2_handle_lpm_intr(struct dwc2_hsotg *hsotg)
 593 {
 594         u32 glpmcfg;
 595         u32 pcgcctl;
 596         u32 hird;
 597         u32 hird_thres;
 598         u32 hird_thres_en;
 599         u32 enslpm;
 600
 601         /* Clear interrupt */
 602         dwc2_writel(hsotg, GINTSTS_LPMTRANRCVD, GINTSTS);
 603
 604         glpmcfg = dwc2_readl(hsotg, GLPMCFG);
 605
 606         if (!(glpmcfg & GLPMCFG_LPMCAP)) {
 607                 dev_err(hsotg->dev, "Unexpected LPM interrupt\n");
 608                 return;
 609         }
 610
 611         hird = (glpmcfg & GLPMCFG_HIRD_MASK) >> GLPMCFG_HIRD_SHIFT;
 612         hird_thres = (glpmcfg & GLPMCFG_HIRD_THRES_MASK &
 613                         ~GLPMCFG_HIRD_THRES_EN) >> GLPMCFG_HIRD_THRES_SHIFT;
 614         hird_thres_en = glpmcfg & GLPMCFG_HIRD_THRES_EN;
 615         enslpm = glpmcfg & GLPMCFG_ENBLSLPM;
 616
 617         if (dwc2_is_device_mode(hsotg)) {
 618                 dev_dbg(hsotg->dev, "HIRD_THRES_EN = %d\n", hird_thres_en);
 619
 620                 if (hird_thres_en && hird >= hird_thres) {
 621                         dev_dbg(hsotg->dev, "L1 with utmi_l1_suspend_n\n");
 622                 } else if (enslpm) {
 623                         dev_dbg(hsotg->dev, "L1 with utmi_sleep_n\n");
 624                 } else {
 625                         dev_dbg(hsotg->dev, "Entering Sleep with L1 Gating\n");
 626
 627                         pcgcctl = dwc2_readl(hsotg, PCGCTL);
 628                         pcgcctl |= PCGCTL_ENBL_SLEEP_GATING;
 629                         dwc2_writel(hsotg, pcgcctl, PCGCTL);
 630                 }
 631                 /**
 632                  * Examine prt_sleep_sts after TL1TokenTetry period max (10 us)
 633                  */
 634                 udelay(10);
 635
 636                 glpmcfg = dwc2_readl(hsotg, GLPMCFG);
 637
 638                 if (glpmcfg & GLPMCFG_SLPSTS) {
 639                         /* Save the current state */
 640                         hsotg->lx_state = DWC2_L1;
 641                         dev_dbg(hsotg->dev,
 642                                 "Core is in L1 sleep glpmcfg=%08x\n", glpmcfg);
 643
 644                         /* Inform gadget that we are in L1 state */
 645                         call_gadget(hsotg, suspend);
 646                 }
 647         }
 648 }
 649
 650 #define GINTMSK_COMMON  (GINTSTS_WKUPINT | GINTSTS_SESSREQINT |         \
 651                          GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT |        \
 652                          GINTSTS_MODEMIS | GINTSTS_DISCONNINT |         \
 653                          GINTSTS_USBSUSP | GINTSTS_PRTINT |             \
 654                          GINTSTS_LPMTRANRCVD)
 655
 656 /*
 657  * This function returns the Core Interrupt register
 658  */
 659 static u32 dwc2_read_common_intr(struct dwc2_hsotg *hsotg)
 660 {
 661         u32 gintsts;
 662         u32 gintmsk;
 663         u32 gahbcfg;
 664         u32 gintmsk_common = GINTMSK_COMMON;
 665
 666         gintsts = dwc2_readl(hsotg, GINTSTS);
 667         gintmsk = dwc2_readl(hsotg, GINTMSK);
 668         gahbcfg = dwc2_readl(hsotg, GAHBCFG);
 669
 670         /* If any common interrupts set */
 671         if (gintsts & gintmsk_common)
 672                 dev_dbg(hsotg->dev, "gintsts=%08x  gintmsk=%08x\n",
 673                         gintsts, gintmsk);
 674
 675         if (gahbcfg & GAHBCFG_GLBL_INTR_EN)
 676                 return gintsts & gintmsk & gintmsk_common;
 677         else
 678                 return 0;
 679 }
 680
 681 /**
 682  * dwc_handle_gpwrdn_disc_det() - Handles the gpwrdn disconnect detect.
 683  * Exits hibernation without restoring registers.
 684  *
 685  * @hsotg: Programming view of DWC_otg controller
 686  * @gpwrdn: GPWRDN register
 687  */
 688 static inline void dwc_handle_gpwrdn_disc_det(struct dwc2_hsotg *hsotg,
 689                                               u32 gpwrdn)
 690 {
 691         u32 gpwrdn_tmp;
 692
 693         /* Switch-on voltage to the core */
 694         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 695         gpwrdn_tmp &= ~GPWRDN_PWRDNSWTCH;
 696         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 697         udelay(5);
 698
 699         /* Reset core */
 700         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 701         gpwrdn_tmp &= ~GPWRDN_PWRDNRSTN;
 702         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 703         udelay(5);
 704
 705         /* Disable Power Down Clamp */
 706         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 707         gpwrdn_tmp &= ~GPWRDN_PWRDNCLMP;
 708         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 709         udelay(5);
 710
 711         /* Deassert reset core */
 712         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 713         gpwrdn_tmp |= GPWRDN_PWRDNRSTN;
 714         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 715         udelay(5);
 716
 717         /* Disable PMU interrupt */
 718         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 719         gpwrdn_tmp &= ~GPWRDN_PMUINTSEL;
 720         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 721
 722         /* De-assert Wakeup Logic */
 723         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 724         gpwrdn_tmp &= ~GPWRDN_PMUACTV;
 725         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 726
 727         hsotg->hibernated = 0;
 728         hsotg->bus_suspended = 0;
 729
 730         if (gpwrdn & GPWRDN_IDSTS) {
 731                 hsotg->op_state = OTG_STATE_B_PERIPHERAL;
 732                 dwc2_core_init(hsotg, false);
 733                 dwc2_enable_global_interrupts(hsotg);
 734                 dwc2_hsotg_core_init_disconnected(hsotg, false);
 735                 dwc2_hsotg_core_connect(hsotg);
 736         } else {
 737                 hsotg->op_state = OTG_STATE_A_HOST;
 738
 739                 /* Initialize the Core for Host mode */
 740                 dwc2_core_init(hsotg, false);
 741                 dwc2_enable_global_interrupts(hsotg);
 742                 dwc2_hcd_start(hsotg);
 743         }
 744 }
 745
 746 /*
 747  * GPWRDN interrupt handler.
 748  *
 749  * The GPWRDN interrupts are those that occur in both Host and
 750  * Device mode while core is in hibernated state.
 751  */
 752 static int dwc2_handle_gpwrdn_intr(struct dwc2_hsotg *hsotg)
 753 {
 754         u32 gpwrdn;
 755         int linestate;
 756         int ret = 0;
 757
 758         gpwrdn = dwc2_readl(hsotg, GPWRDN);
 759         /* clear all interrupt */
 760         dwc2_writel(hsotg, gpwrdn, GPWRDN);
 761         linestate = (gpwrdn & GPWRDN_LINESTATE_MASK) >> GPWRDN_LINESTATE_SHIFT;
 762         dev_dbg(hsotg->dev,
 763                 "%s: dwc2_handle_gpwrdwn_intr called gpwrdn= %08x\n", __func__,
 764                 gpwrdn);
 765
 766         if ((gpwrdn & GPWRDN_DISCONN_DET) &&
 767             (gpwrdn & GPWRDN_DISCONN_DET_MSK) && !linestate) {
 768                 dev_dbg(hsotg->dev, "%s: GPWRDN_DISCONN_DET\n", __func__);
 769                 /*
 770                  * Call disconnect detect function to exit from
 771                  * hibernation
 772                  */
 773                 dwc_handle_gpwrdn_disc_det(hsotg, gpwrdn);
 774         } else if ((gpwrdn & GPWRDN_LNSTSCHG) &&
 775                    (gpwrdn & GPWRDN_LNSTSCHG_MSK) && linestate) {
 776                 dev_dbg(hsotg->dev, "%s: GPWRDN_LNSTSCHG\n", __func__);
 777                 if (hsotg->hw_params.hibernation &&
 778                     hsotg->hibernated) {
 779                         if (gpwrdn & GPWRDN_IDSTS) {
 780                                 ret = dwc2_exit_hibernation(hsotg, 0, 0, 0);
 781                                 if (ret)
 782                                         dev_err(hsotg->dev,
 783                                                 "exit hibernation failed.\n");
 784                                 call_gadget(hsotg, resume);
 785                         } else {
 786                                 ret = dwc2_exit_hibernation(hsotg, 1, 0, 1);
 787                                 if (ret)
 788                                         dev_err(hsotg->dev,
 789                                                 "exit hibernation failed.\n");
 790                         }
 791                 }
 792         } else if ((gpwrdn & GPWRDN_RST_DET) &&
 793                    (gpwrdn & GPWRDN_RST_DET_MSK)) {
 794                 dev_dbg(hsotg->dev, "%s: GPWRDN_RST_DET\n", __func__);
 795                 if (!linestate) {
 796                         ret = dwc2_exit_hibernation(hsotg, 0, 1, 0);
 797                         if (ret)
 798                                 dev_err(hsotg->dev,
 799                                         "exit hibernation failed.\n");
 800                 }
 801         } else if ((gpwrdn & GPWRDN_STS_CHGINT) &&
 802                    (gpwrdn & GPWRDN_STS_CHGINT_MSK)) {
 803                 dev_dbg(hsotg->dev, "%s: GPWRDN_STS_CHGINT\n", __func__);
 804                 /*
 805                  * As GPWRDN_STS_CHGINT exit from hibernation flow is
 806                  * the same as in GPWRDN_DISCONN_DET flow. Call
 807                  * disconnect detect helper function to exit from
 808                  * hibernation.
 809                  */
 810                 dwc_handle_gpwrdn_disc_det(hsotg, gpwrdn);
 811         }
 812
 813         return ret;
 814 }
 815
 816 /*
 817  * Common interrupt handler
 818  *
 819  * The common interrupts are those that occur in both Host and Device mode.
 820  * This handler handles the following interrupts:
 821  * - Mode Mismatch Interrupt
 822  * - OTG Interrupt
 823  * - Connector ID Status Change Interrupt
 824  * - Disconnect Interrupt
 825  * - Session Request Interrupt
 826  * - Resume / Remote Wakeup Detected Interrupt
 827  * - Suspend Interrupt
 828  */
 829 irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
 830 {
 831         struct dwc2_hsotg *hsotg = dev;
 832         u32 gintsts;
 833         irqreturn_t retval = IRQ_NONE;
 834
 835         spin_lock(&hsotg->lock);
 836
 837         if (!dwc2_is_controller_alive(hsotg)) {
 838                 dev_warn(hsotg->dev, "Controller is dead\n");
 839                 goto out;
 840         }
 841
 842         /* Reading current frame number value in device or host modes. */
 843         if (dwc2_is_device_mode(hsotg))
 844                 hsotg->frame_number = (dwc2_readl(hsotg, DSTS)
 845                                        & DSTS_SOFFN_MASK) >> DSTS_SOFFN_SHIFT;
 846         else
 847                 hsotg->frame_number = (dwc2_readl(hsotg, HFNUM)
 848                                        & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
 849
 850         gintsts = dwc2_read_common_intr(hsotg);
 851         if (gintsts & ~GINTSTS_PRTINT)
 852                 retval = IRQ_HANDLED;
 853
 854         /* In case of hibernated state gintsts must not work */
 855         if (hsotg->hibernated) {
 856                 dwc2_handle_gpwrdn_intr(hsotg);
 857                 retval = IRQ_HANDLED;
 858                 goto out;
 859         }
 860
 861         if (gintsts & GINTSTS_MODEMIS)
 862                 dwc2_handle_mode_mismatch_intr(hsotg);
 863         if (gintsts & GINTSTS_OTGINT)
 864                 dwc2_handle_otg_intr(hsotg);
 865         if (gintsts & GINTSTS_CONIDSTSCHNG)
 866                 dwc2_handle_conn_id_status_change_intr(hsotg);
 867         if (gintsts & GINTSTS_DISCONNINT)
 868                 dwc2_handle_disconnect_intr(hsotg);
 869         if (gintsts & GINTSTS_SESSREQINT)
 870                 dwc2_handle_session_req_intr(hsotg);
 871         if (gintsts & GINTSTS_WKUPINT)
 872                 dwc2_handle_wakeup_detected_intr(hsotg);
 873         if (gintsts & GINTSTS_USBSUSP)
 874                 dwc2_handle_usb_suspend_intr(hsotg);
 875         if (gintsts & GINTSTS_LPMTRANRCVD)
 876                 dwc2_handle_lpm_intr(hsotg);
 877
 878         if (gintsts & GINTSTS_PRTINT) {
 879                 /*
 880                  * The port interrupt occurs while in device mode with HPRT0
 881                  * Port Enable/Disable
 882                  */
 883                 if (dwc2_is_device_mode(hsotg)) {
 884                         dev_dbg(hsotg->dev,
 885                                 " --Port interrupt received in Device mode--\n");
 886                         dwc2_handle_usb_port_intr(hsotg);
 887                         retval = IRQ_HANDLED;
 888                 }
 889         }
 890
 891 out:
 892         spin_unlock(&hsotg->lock);
 893         return retval;
 894 }