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                         ret = dwc2_exit_partial_power_down(hsotg, true);
 321                         if (ret && (ret != -ENOTSUPP))
 322                                 dev_err(hsotg->dev,
 323                                         "exit power_down failed\n");
 324                 }
 325
 326                 /*
 327                  * Report disconnect if there is any previous session
 328                  * established
 329                  */
 330                 dwc2_hsotg_disconnect(hsotg);
 331         } else {
 332                 /* Turn on the port power bit. */
 333                 hprt0 = dwc2_read_hprt0(hsotg);
 334                 hprt0 |= HPRT0_PWR;
 335                 dwc2_writel(hsotg, hprt0, HPRT0);
 336                 /* Connect hcd after port power is set. */
 337                 dwc2_hcd_connect(hsotg);
 338         }
 339 }
 340
 341 /**
 342  * dwc2_wakeup_from_lpm_l1 - Exit the device from LPM L1 state
 343  *
 344  * @hsotg: Programming view of DWC_otg controller
 345  *
 346  */
 347 static void dwc2_wakeup_from_lpm_l1(struct dwc2_hsotg *hsotg)
 348 {
 349         u32 glpmcfg;
 350         u32 i = 0;
 351
 352         if (hsotg->lx_state != DWC2_L1) {
 353                 dev_err(hsotg->dev, "Core isn't in DWC2_L1 state\n");
 354                 return;
 355         }
 356
 357         glpmcfg = dwc2_readl(hsotg, GLPMCFG);
 358         if (dwc2_is_device_mode(hsotg)) {
 359                 dev_dbg(hsotg->dev, "Exit from L1 state\n");
 360                 glpmcfg &= ~GLPMCFG_ENBLSLPM;
 361                 glpmcfg &= ~GLPMCFG_HIRD_THRES_EN;
 362                 dwc2_writel(hsotg, glpmcfg, GLPMCFG);
 363
 364                 do {
 365                         glpmcfg = dwc2_readl(hsotg, GLPMCFG);
 366
 367                         if (!(glpmcfg & (GLPMCFG_COREL1RES_MASK |
 368                                          GLPMCFG_L1RESUMEOK | GLPMCFG_SLPSTS)))
 369                                 break;
 370
 371                         udelay(1);
 372                 } while (++i < 200);
 373
 374                 if (i == 200) {
 375                         dev_err(hsotg->dev, "Failed to exit L1 sleep state in 200us.\n");
 376                         return;
 377                 }
 378                 dwc2_gadget_init_lpm(hsotg);
 379         } else {
 380                 /* TODO */
 381                 dev_err(hsotg->dev, "Host side LPM is not supported.\n");
 382                 return;
 383         }
 384
 385         /* Change to L0 state */
 386         hsotg->lx_state = DWC2_L0;
 387
 388         /* Inform gadget to exit from L1 */
 389         call_gadget(hsotg, resume);
 390 }
 391
 392 /*
 393  * This interrupt indicates that the DWC_otg controller has detected a
 394  * resume or remote wakeup sequence. If the DWC_otg controller is in
 395  * low power mode, the handler must brings the controller out of low
 396  * power mode. The controller automatically begins resume signaling.
 397  * The handler schedules a time to stop resume signaling.
 398  */
 399 static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
 400 {
 401         int ret;
 402
 403         /* Clear interrupt */
 404         dwc2_writel(hsotg, GINTSTS_WKUPINT, GINTSTS);
 405
 406         dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");
 407         dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
 408
 409         if (hsotg->lx_state == DWC2_L1) {
 410                 dwc2_wakeup_from_lpm_l1(hsotg);
 411                 return;
 412         }
 413
 414         if (dwc2_is_device_mode(hsotg)) {
 415                 dev_dbg(hsotg->dev, "DSTS=0x%0x\n",
 416                         dwc2_readl(hsotg, DSTS));
 417                 if (hsotg->lx_state == DWC2_L2) {
 418                         u32 dctl = dwc2_readl(hsotg, DCTL);
 419
 420                         /* Clear Remote Wakeup Signaling */
 421                         dctl &= ~DCTL_RMTWKUPSIG;
 422                         dwc2_writel(hsotg, dctl, DCTL);
 423                         ret = dwc2_exit_partial_power_down(hsotg, true);
 424                         if (ret && (ret != -ENOTSUPP))
 425                                 dev_err(hsotg->dev, "exit power_down failed\n");
 426
 427                         /* Change to L0 state */
 428                         hsotg->lx_state = DWC2_L0;
 429                         call_gadget(hsotg, resume);
 430                 } else {
 431                         /* Change to L0 state */
 432                         hsotg->lx_state = DWC2_L0;
 433                 }
 434         } else {
 435                 if (hsotg->params.power_down)
 436                         return;
 437
 438                 if (hsotg->lx_state != DWC2_L1) {
 439                         u32 pcgcctl = dwc2_readl(hsotg, PCGCTL);
 440
 441                         /* Restart the Phy Clock */
 442                         pcgcctl &= ~PCGCTL_STOPPCLK;
 443                         dwc2_writel(hsotg, pcgcctl, PCGCTL);
 444
 445                         /*
 446                          * If we've got this quirk then the PHY is stuck upon
 447                          * wakeup.  Assert reset.  This will propagate out and
 448                          * eventually we'll re-enumerate the device.  Not great
 449                          * but the best we can do.  We can't call phy_reset()
 450                          * at interrupt time but there's no hurry, so we'll
 451                          * schedule it for later.
 452                          */
 453                         if (hsotg->reset_phy_on_wake)
 454                                 dwc2_host_schedule_phy_reset(hsotg);
 455
 456                         mod_timer(&hsotg->wkp_timer,
 457                                   jiffies + msecs_to_jiffies(71));
 458                 } else {
 459                         /* Change to L0 state */
 460                         hsotg->lx_state = DWC2_L0;
 461                 }
 462         }
 463 }
 464
 465 /*
 466  * This interrupt indicates that a device has been disconnected from the
 467  * root port
 468  */
 469 static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg)
 470 {
 471         dwc2_writel(hsotg, GINTSTS_DISCONNINT, GINTSTS);
 472
 473         dev_dbg(hsotg->dev, "++Disconnect Detected Interrupt++ (%s) %s\n",
 474                 dwc2_is_host_mode(hsotg) ? "Host" : "Device",
 475                 dwc2_op_state_str(hsotg));
 476
 477         if (hsotg->op_state == OTG_STATE_A_HOST)
 478                 dwc2_hcd_disconnect(hsotg, false);
 479 }
 480
 481 /*
 482  * This interrupt indicates that SUSPEND state has been detected on the USB.
 483  *
 484  * For HNP the USB Suspend interrupt signals the change from "a_peripheral"
 485  * to "a_host".
 486  *
 487  * When power management is enabled the core will be put in low power mode.
 488  */
 489 static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
 490 {
 491         u32 dsts;
 492         int ret;
 493
 494         /* Clear interrupt */
 495         dwc2_writel(hsotg, GINTSTS_USBSUSP, GINTSTS);
 496
 497         dev_dbg(hsotg->dev, "USB SUSPEND\n");
 498
 499         if (dwc2_is_device_mode(hsotg)) {
 500                 /*
 501                  * Check the Device status register to determine if the Suspend
 502                  * state is active
 503                  */
 504                 dsts = dwc2_readl(hsotg, DSTS);
 505                 dev_dbg(hsotg->dev, "%s: DSTS=0x%0x\n", __func__, dsts);
 506                 dev_dbg(hsotg->dev,
 507                         "DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d HWCFG4.Hibernation=%d\n",
 508                         !!(dsts & DSTS_SUSPSTS),
 509                         hsotg->hw_params.power_optimized,
 510                         hsotg->hw_params.hibernation);
 511
 512                 /* Ignore suspend request before enumeration */
 513                 if (!dwc2_is_device_connected(hsotg)) {
 514                         dev_dbg(hsotg->dev,
 515                                 "ignore suspend request before enumeration\n");
 516                         return;
 517                 }
 518                 if (dsts & DSTS_SUSPSTS) {
 519                         if (hsotg->hw_params.power_optimized) {
 520                                 ret = dwc2_enter_partial_power_down(hsotg);
 521                                 if (ret) {
 522                                         if (ret != -ENOTSUPP)
 523                                                 dev_err(hsotg->dev,
 524                                                         "%s: enter partial_power_down failed\n",
 525                                                         __func__);
 526                                         goto skip_power_saving;
 527                                 }
 528
 529                                 udelay(100);
 530
 531                                 /* Ask phy to be suspended */
 532                                 if (!IS_ERR_OR_NULL(hsotg->uphy))
 533                                         usb_phy_set_suspend(hsotg->uphy, true);
 534                         }
 535
 536                         if (hsotg->hw_params.hibernation) {
 537                                 ret = dwc2_enter_hibernation(hsotg, 0);
 538                                 if (ret && ret != -ENOTSUPP)
 539                                         dev_err(hsotg->dev,
 540                                                 "%s: enter hibernation failed\n",
 541                                                 __func__);
 542                         }
 543 skip_power_saving:
 544                         /*
 545                          * Change to L2 (suspend) state before releasing
 546                          * spinlock
 547                          */
 548                         hsotg->lx_state = DWC2_L2;
 549
 550                         /* Call gadget suspend callback */
 551                         call_gadget(hsotg, suspend);
 552                 }
 553         } else {
 554                 if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) {
 555                         dev_dbg(hsotg->dev, "a_peripheral->a_host\n");
 556
 557                         /* Change to L2 (suspend) state */
 558                         hsotg->lx_state = DWC2_L2;
 559                         /* Clear the a_peripheral flag, back to a_host */
 560                         spin_unlock(&hsotg->lock);
 561                         dwc2_hcd_start(hsotg);
 562                         spin_lock(&hsotg->lock);
 563                         hsotg->op_state = OTG_STATE_A_HOST;
 564                 }
 565         }
 566 }
 567
 568 /**
 569  * dwc2_handle_lpm_intr - GINTSTS_LPMTRANRCVD Interrupt handler
 570  *
 571  * @hsotg: Programming view of DWC_otg controller
 572  *
 573  */
 574 static void dwc2_handle_lpm_intr(struct dwc2_hsotg *hsotg)
 575 {
 576         u32 glpmcfg;
 577         u32 pcgcctl;
 578         u32 hird;
 579         u32 hird_thres;
 580         u32 hird_thres_en;
 581         u32 enslpm;
 582
 583         /* Clear interrupt */
 584         dwc2_writel(hsotg, GINTSTS_LPMTRANRCVD, GINTSTS);
 585
 586         glpmcfg = dwc2_readl(hsotg, GLPMCFG);
 587
 588         if (!(glpmcfg & GLPMCFG_LPMCAP)) {
 589                 dev_err(hsotg->dev, "Unexpected LPM interrupt\n");
 590                 return;
 591         }
 592
 593         hird = (glpmcfg & GLPMCFG_HIRD_MASK) >> GLPMCFG_HIRD_SHIFT;
 594         hird_thres = (glpmcfg & GLPMCFG_HIRD_THRES_MASK &
 595                         ~GLPMCFG_HIRD_THRES_EN) >> GLPMCFG_HIRD_THRES_SHIFT;
 596         hird_thres_en = glpmcfg & GLPMCFG_HIRD_THRES_EN;
 597         enslpm = glpmcfg & GLPMCFG_ENBLSLPM;
 598
 599         if (dwc2_is_device_mode(hsotg)) {
 600                 dev_dbg(hsotg->dev, "HIRD_THRES_EN = %d\n", hird_thres_en);
 601
 602                 if (hird_thres_en && hird >= hird_thres) {
 603                         dev_dbg(hsotg->dev, "L1 with utmi_l1_suspend_n\n");
 604                 } else if (enslpm) {
 605                         dev_dbg(hsotg->dev, "L1 with utmi_sleep_n\n");
 606                 } else {
 607                         dev_dbg(hsotg->dev, "Entering Sleep with L1 Gating\n");
 608
 609                         pcgcctl = dwc2_readl(hsotg, PCGCTL);
 610                         pcgcctl |= PCGCTL_ENBL_SLEEP_GATING;
 611                         dwc2_writel(hsotg, pcgcctl, PCGCTL);
 612                 }
 613                 /**
 614                  * Examine prt_sleep_sts after TL1TokenTetry period max (10 us)
 615                  */
 616                 udelay(10);
 617
 618                 glpmcfg = dwc2_readl(hsotg, GLPMCFG);
 619
 620                 if (glpmcfg & GLPMCFG_SLPSTS) {
 621                         /* Save the current state */
 622                         hsotg->lx_state = DWC2_L1;
 623                         dev_dbg(hsotg->dev,
 624                                 "Core is in L1 sleep glpmcfg=%08x\n", glpmcfg);
 625
 626                         /* Inform gadget that we are in L1 state */
 627                         call_gadget(hsotg, suspend);
 628                 }
 629         }
 630 }
 631
 632 #define GINTMSK_COMMON  (GINTSTS_WKUPINT | GINTSTS_SESSREQINT |         \
 633                          GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT |        \
 634                          GINTSTS_MODEMIS | GINTSTS_DISCONNINT |         \
 635                          GINTSTS_USBSUSP | GINTSTS_PRTINT |             \
 636                          GINTSTS_LPMTRANRCVD)
 637
 638 /*
 639  * This function returns the Core Interrupt register
 640  */
 641 static u32 dwc2_read_common_intr(struct dwc2_hsotg *hsotg)
 642 {
 643         u32 gintsts;
 644         u32 gintmsk;
 645         u32 gahbcfg;
 646         u32 gintmsk_common = GINTMSK_COMMON;
 647
 648         gintsts = dwc2_readl(hsotg, GINTSTS);
 649         gintmsk = dwc2_readl(hsotg, GINTMSK);
 650         gahbcfg = dwc2_readl(hsotg, GAHBCFG);
 651
 652         /* If any common interrupts set */
 653         if (gintsts & gintmsk_common)
 654                 dev_dbg(hsotg->dev, "gintsts=%08x  gintmsk=%08x\n",
 655                         gintsts, gintmsk);
 656
 657         if (gahbcfg & GAHBCFG_GLBL_INTR_EN)
 658                 return gintsts & gintmsk & gintmsk_common;
 659         else
 660                 return 0;
 661 }
 662
 663 /**
 664  * dwc_handle_gpwrdn_disc_det() - Handles the gpwrdn disconnect detect.
 665  * Exits hibernation without restoring registers.
 666  *
 667  * @hsotg: Programming view of DWC_otg controller
 668  * @gpwrdn: GPWRDN register
 669  */
 670 static inline void dwc_handle_gpwrdn_disc_det(struct dwc2_hsotg *hsotg,
 671                                               u32 gpwrdn)
 672 {
 673         u32 gpwrdn_tmp;
 674
 675         /* Switch-on voltage to the core */
 676         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 677         gpwrdn_tmp &= ~GPWRDN_PWRDNSWTCH;
 678         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 679         udelay(5);
 680
 681         /* Reset core */
 682         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 683         gpwrdn_tmp &= ~GPWRDN_PWRDNRSTN;
 684         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 685         udelay(5);
 686
 687         /* Disable Power Down Clamp */
 688         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 689         gpwrdn_tmp &= ~GPWRDN_PWRDNCLMP;
 690         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 691         udelay(5);
 692
 693         /* Deassert reset core */
 694         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 695         gpwrdn_tmp |= GPWRDN_PWRDNRSTN;
 696         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 697         udelay(5);
 698
 699         /* Disable PMU interrupt */
 700         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 701         gpwrdn_tmp &= ~GPWRDN_PMUINTSEL;
 702         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 703
 704         /* De-assert Wakeup Logic */
 705         gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
 706         gpwrdn_tmp &= ~GPWRDN_PMUACTV;
 707         dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
 708
 709         hsotg->hibernated = 0;
 710
 711 #if IS_ENABLED(CONFIG_USB_DWC2_HOST) || \
 712         IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
 713         hsotg->bus_suspended = 0;
 714 #endif
 715
 716         if (gpwrdn & GPWRDN_IDSTS) {
 717                 hsotg->op_state = OTG_STATE_B_PERIPHERAL;
 718                 dwc2_core_init(hsotg, false);
 719                 dwc2_enable_global_interrupts(hsotg);
 720                 dwc2_hsotg_core_init_disconnected(hsotg, false);
 721                 dwc2_hsotg_core_connect(hsotg);
 722         } else {
 723                 hsotg->op_state = OTG_STATE_A_HOST;
 724
 725                 /* Initialize the Core for Host mode */
 726                 dwc2_core_init(hsotg, false);
 727                 dwc2_enable_global_interrupts(hsotg);
 728                 dwc2_hcd_start(hsotg);
 729         }
 730 }
 731
 732 /*
 733  * GPWRDN interrupt handler.
 734  *
 735  * The GPWRDN interrupts are those that occur in both Host and
 736  * Device mode while core is in hibernated state.
 737  */
 738 static void dwc2_handle_gpwrdn_intr(struct dwc2_hsotg *hsotg)
 739 {
 740         u32 gpwrdn;
 741         int linestate;
 742
 743         gpwrdn = dwc2_readl(hsotg, GPWRDN);
 744         /* clear all interrupt */
 745         dwc2_writel(hsotg, gpwrdn, GPWRDN);
 746         linestate = (gpwrdn & GPWRDN_LINESTATE_MASK) >> GPWRDN_LINESTATE_SHIFT;
 747         dev_dbg(hsotg->dev,
 748                 "%s: dwc2_handle_gpwrdwn_intr called gpwrdn= %08x\n", __func__,
 749                 gpwrdn);
 750
 751         if ((gpwrdn & GPWRDN_DISCONN_DET) &&
 752             (gpwrdn & GPWRDN_DISCONN_DET_MSK) && !linestate) {
 753                 dev_dbg(hsotg->dev, "%s: GPWRDN_DISCONN_DET\n", __func__);
 754                 /*
 755                  * Call disconnect detect function to exit from
 756                  * hibernation
 757                  */
 758                 dwc_handle_gpwrdn_disc_det(hsotg, gpwrdn);
 759         } else if ((gpwrdn & GPWRDN_LNSTSCHG) &&
 760                    (gpwrdn & GPWRDN_LNSTSCHG_MSK) && linestate) {
 761                 dev_dbg(hsotg->dev, "%s: GPWRDN_LNSTSCHG\n", __func__);
 762                 if (hsotg->hw_params.hibernation &&
 763                     hsotg->hibernated) {
 764                         if (gpwrdn & GPWRDN_IDSTS) {
 765                                 dwc2_exit_hibernation(hsotg, 0, 0, 0);
 766                                 call_gadget(hsotg, resume);
 767                         } else {
 768                                 dwc2_exit_hibernation(hsotg, 1, 0, 1);
 769                         }
 770                 }
 771         } else if ((gpwrdn & GPWRDN_RST_DET) &&
 772                    (gpwrdn & GPWRDN_RST_DET_MSK)) {
 773                 dev_dbg(hsotg->dev, "%s: GPWRDN_RST_DET\n", __func__);
 774                 if (!linestate && (gpwrdn & GPWRDN_BSESSVLD))
 775                         dwc2_exit_hibernation(hsotg, 0, 1, 0);
 776         } else if ((gpwrdn & GPWRDN_STS_CHGINT) &&
 777                    (gpwrdn & GPWRDN_STS_CHGINT_MSK)) {
 778                 dev_dbg(hsotg->dev, "%s: GPWRDN_STS_CHGINT\n", __func__);
 779                 /*
 780                  * As GPWRDN_STS_CHGINT exit from hibernation flow is
 781                  * the same as in GPWRDN_DISCONN_DET flow. Call
 782                  * disconnect detect helper function to exit from
 783                  * hibernation.
 784                  */
 785                 dwc_handle_gpwrdn_disc_det(hsotg, gpwrdn);
 786         }
 787 }
 788
 789 /*
 790  * Common interrupt handler
 791  *
 792  * The common interrupts are those that occur in both Host and Device mode.
 793  * This handler handles the following interrupts:
 794  * - Mode Mismatch Interrupt
 795  * - OTG Interrupt
 796  * - Connector ID Status Change Interrupt
 797  * - Disconnect Interrupt
 798  * - Session Request Interrupt
 799  * - Resume / Remote Wakeup Detected Interrupt
 800  * - Suspend Interrupt
 801  */
 802 irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
 803 {
 804         struct dwc2_hsotg *hsotg = dev;
 805         u32 gintsts;
 806         irqreturn_t retval = IRQ_NONE;
 807
 808         spin_lock(&hsotg->lock);
 809
 810         if (!dwc2_is_controller_alive(hsotg)) {
 811                 dev_warn(hsotg->dev, "Controller is dead\n");
 812                 goto out;
 813         }
 814
 815         /* Reading current frame number value in device or host modes. */
 816         if (dwc2_is_device_mode(hsotg))
 817                 hsotg->frame_number = (dwc2_readl(hsotg, DSTS)
 818                                        & DSTS_SOFFN_MASK) >> DSTS_SOFFN_SHIFT;
 819         else
 820                 hsotg->frame_number = (dwc2_readl(hsotg, HFNUM)
 821                                        & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
 822
 823         gintsts = dwc2_read_common_intr(hsotg);
 824         if (gintsts & ~GINTSTS_PRTINT)
 825                 retval = IRQ_HANDLED;
 826
 827         /* In case of hibernated state gintsts must not work */
 828         if (hsotg->hibernated) {
 829                 dwc2_handle_gpwrdn_intr(hsotg);
 830                 retval = IRQ_HANDLED;
 831                 goto out;
 832         }
 833
 834         if (gintsts & GINTSTS_MODEMIS)
 835                 dwc2_handle_mode_mismatch_intr(hsotg);
 836         if (gintsts & GINTSTS_OTGINT)
 837                 dwc2_handle_otg_intr(hsotg);
 838         if (gintsts & GINTSTS_CONIDSTSCHNG)
 839                 dwc2_handle_conn_id_status_change_intr(hsotg);
 840         if (gintsts & GINTSTS_DISCONNINT)
 841                 dwc2_handle_disconnect_intr(hsotg);
 842         if (gintsts & GINTSTS_SESSREQINT)
 843                 dwc2_handle_session_req_intr(hsotg);
 844         if (gintsts & GINTSTS_WKUPINT)
 845                 dwc2_handle_wakeup_detected_intr(hsotg);
 846         if (gintsts & GINTSTS_USBSUSP)
 847                 dwc2_handle_usb_suspend_intr(hsotg);
 848         if (gintsts & GINTSTS_LPMTRANRCVD)
 849                 dwc2_handle_lpm_intr(hsotg);
 850
 851         if (gintsts & GINTSTS_PRTINT) {
 852                 /*
 853                  * The port interrupt occurs while in device mode with HPRT0
 854                  * Port Enable/Disable
 855                  */
 856                 if (dwc2_is_device_mode(hsotg)) {
 857                         dev_dbg(hsotg->dev,
 858                                 " --Port interrupt received in Device mode--\n");
 859                         dwc2_handle_usb_port_intr(hsotg);
 860                         retval = IRQ_HANDLED;
 861                 }
 862         }
 863
 864 out:
 865         spin_unlock(&hsotg->lock);
 866         return retval;
 867 }