drivers/usb/cdns3/core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Cadence USBSS DRD Driver.
   4  *
   5  * Copyright (C) 2018-2019 Cadence.
   6  * Copyright (C) 2017-2018 NXP
   7  * Copyright (C) 2019 Texas Instruments
   8  *
   9  * Author: Peter Chen <peter.chen@nxp.com>
  10  *         Pawel Laszczak <pawell@cadence.com>
  11  *         Roger Quadros <rogerq@ti.com>
  12  */
  13
  14 #include <linux/dma-mapping.h>
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/io.h>
  20 #include <linux/pm_runtime.h>
  21
  22 #include "gadget.h"
  23 #include "core.h"
  24 #include "host-export.h"
  25 #include "gadget-export.h"
  26 #include "drd.h"
  27
  28 static int cdns3_idle_init(struct cdns3 *cdns);
  29
  30 static int cdns3_role_start(struct cdns3 *cdns, enum usb_role role)
  31 {
  32         int ret;
  33
  34         if (WARN_ON(role > USB_ROLE_DEVICE))
  35                 return 0;
  36
  37         mutex_lock(&cdns->mutex);
  38         cdns->role = role;
  39         mutex_unlock(&cdns->mutex);
  40
  41         if (!cdns->roles[role])
  42                 return -ENXIO;
  43
  44         if (cdns->roles[role]->state == CDNS3_ROLE_STATE_ACTIVE)
  45                 return 0;
  46
  47         mutex_lock(&cdns->mutex);
  48         ret = cdns->roles[role]->start(cdns);
  49         if (!ret)
  50                 cdns->roles[role]->state = CDNS3_ROLE_STATE_ACTIVE;
  51         mutex_unlock(&cdns->mutex);
  52
  53         return ret;
  54 }
  55
  56 static void cdns3_role_stop(struct cdns3 *cdns)
  57 {
  58         enum usb_role role = cdns->role;
  59
  60         if (WARN_ON(role > USB_ROLE_DEVICE))
  61                 return;
  62
  63         if (cdns->roles[role]->state == CDNS3_ROLE_STATE_INACTIVE)
  64                 return;
  65
  66         mutex_lock(&cdns->mutex);
  67         cdns->roles[role]->stop(cdns);
  68         cdns->roles[role]->state = CDNS3_ROLE_STATE_INACTIVE;
  69         mutex_unlock(&cdns->mutex);
  70 }
  71
  72 static void cdns3_exit_roles(struct cdns3 *cdns)
  73 {
  74         cdns3_role_stop(cdns);
  75         cdns3_drd_exit(cdns);
  76 }
  77
  78 /**
  79  * cdns3_core_init_role - initialize role of operation
  80  * @cdns: Pointer to cdns3 structure
  81  *
  82  * Returns 0 on success otherwise negative errno
  83  */
  84 static int cdns3_core_init_role(struct cdns3 *cdns)
  85 {
  86         struct device *dev = cdns->dev;
  87         enum usb_dr_mode best_dr_mode;
  88         enum usb_dr_mode dr_mode;
  89         int ret;
  90
  91         dr_mode = usb_get_dr_mode(dev);
  92         cdns->role = USB_ROLE_NONE;
  93
  94         /*
  95          * If driver can't read mode by means of usb_get_dr_mode function then
  96          * chooses mode according with Kernel configuration. This setting
  97          * can be restricted later depending on strap pin configuration.
  98          */
  99         if (dr_mode == USB_DR_MODE_UNKNOWN) {
 100                 if (IS_ENABLED(CONFIG_USB_CDNS3_HOST) &&
 101                     IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
 102                         dr_mode = USB_DR_MODE_OTG;
 103                 else if (IS_ENABLED(CONFIG_USB_CDNS3_HOST))
 104                         dr_mode = USB_DR_MODE_HOST;
 105                 else if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
 106                         dr_mode = USB_DR_MODE_PERIPHERAL;
 107         }
 108
 109         /*
 110          * At this point cdns->dr_mode contains strap configuration.
 111          * Driver try update this setting considering kernel configuration
 112          */
 113         best_dr_mode = cdns->dr_mode;
 114
 115         ret = cdns3_idle_init(cdns);
 116         if (ret)
 117                 return ret;
 118
 119         if (dr_mode == USB_DR_MODE_OTG) {
 120                 best_dr_mode = cdns->dr_mode;
 121         } else if (cdns->dr_mode == USB_DR_MODE_OTG) {
 122                 best_dr_mode = dr_mode;
 123         } else if (cdns->dr_mode != dr_mode) {
 124                 dev_err(dev, "Incorrect DRD configuration\n");
 125                 return -EINVAL;
 126         }
 127
 128         dr_mode = best_dr_mode;
 129
 130         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
 131                 ret = cdns3_host_init(cdns);
 132                 if (ret) {
 133                         dev_err(dev, "Host initialization failed with %d\n",
 134                                 ret);
 135                         goto err;
 136                 }
 137         }
 138
 139         if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
 140                 ret = cdns3_gadget_init(cdns);
 141                 if (ret) {
 142                         dev_err(dev, "Device initialization failed with %d\n",
 143                                 ret);
 144                         goto err;
 145                 }
 146         }
 147
 148         cdns->dr_mode = dr_mode;
 149
 150         ret = cdns3_drd_update_mode(cdns);
 151         if (ret)
 152                 goto err;
 153
 154         /* Initialize idle role to start with */
 155         ret = cdns3_role_start(cdns, USB_ROLE_NONE);
 156         if (ret)
 157                 goto err;
 158
 159         switch (cdns->dr_mode) {
 160         case USB_DR_MODE_OTG:
 161                 ret = cdns3_hw_role_switch(cdns);
 162                 if (ret)
 163                         goto err;
 164                 break;
 165         case USB_DR_MODE_PERIPHERAL:
 166                 ret = cdns3_role_start(cdns, USB_ROLE_DEVICE);
 167                 if (ret)
 168                         goto err;
 169                 break;
 170         case USB_DR_MODE_HOST:
 171                 ret = cdns3_role_start(cdns, USB_ROLE_HOST);
 172                 if (ret)
 173                         goto err;
 174                 break;
 175         default:
 176                 ret = -EINVAL;
 177                 goto err;
 178         }
 179
 180         return 0;
 181 err:
 182         cdns3_exit_roles(cdns);
 183         return ret;
 184 }
 185
 186 /**
 187  * cdns3_hw_role_state_machine  - role switch state machine based on hw events.
 188  * @cdns: Pointer to controller structure.
 189  *
 190  * Returns next role to be entered based on hw events.
 191  */
 192 static enum usb_role cdns3_hw_role_state_machine(struct cdns3 *cdns)
 193 {
 194         enum usb_role role = USB_ROLE_NONE;
 195         int id, vbus;
 196
 197         if (cdns->dr_mode != USB_DR_MODE_OTG) {
 198                 if (cdns3_is_host(cdns))
 199                         role = USB_ROLE_HOST;
 200                 if (cdns3_is_device(cdns))
 201                         role = USB_ROLE_DEVICE;
 202
 203                 return role;
 204         }
 205
 206         id = cdns3_get_id(cdns);
 207         vbus = cdns3_get_vbus(cdns);
 208
 209         /*
 210          * Role change state machine
 211          * Inputs: ID, VBUS
 212          * Previous state: cdns->role
 213          * Next state: role
 214          */
 215         role = cdns->role;
 216
 217         switch (role) {
 218         case USB_ROLE_NONE:
 219                 /*
 220                  * Driver treats USB_ROLE_NONE synonymous to IDLE state from
 221                  * controller specification.
 222                  */
 223                 if (!id)
 224                         role = USB_ROLE_HOST;
 225                 else if (vbus)
 226                         role = USB_ROLE_DEVICE;
 227                 break;
 228         case USB_ROLE_HOST: /* from HOST, we can only change to NONE */
 229                 if (id)
 230                         role = USB_ROLE_NONE;
 231                 break;
 232         case USB_ROLE_DEVICE: /* from GADGET, we can only change to NONE*/
 233                 if (!vbus)
 234                         role = USB_ROLE_NONE;
 235                 break;
 236         }
 237
 238         dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);
 239
 240         return role;
 241 }
 242
 243 static int cdns3_idle_role_start(struct cdns3 *cdns)
 244 {
 245         return 0;
 246 }
 247
 248 static void cdns3_idle_role_stop(struct cdns3 *cdns)
 249 {
 250         /* Program Lane swap and bring PHY out of RESET */
 251         phy_reset(cdns->usb3_phy);
 252 }
 253
 254 static int cdns3_idle_init(struct cdns3 *cdns)
 255 {
 256         struct cdns3_role_driver *rdrv;
 257
 258         rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
 259         if (!rdrv)
 260                 return -ENOMEM;
 261
 262         rdrv->start = cdns3_idle_role_start;
 263         rdrv->stop = cdns3_idle_role_stop;
 264         rdrv->state = CDNS3_ROLE_STATE_INACTIVE;
 265         rdrv->suspend = NULL;
 266         rdrv->resume = NULL;
 267         rdrv->name = "idle";
 268
 269         cdns->roles[USB_ROLE_NONE] = rdrv;
 270
 271         return 0;
 272 }
 273
 274 /**
 275  * cdns3_hw_role_switch - switch roles based on HW state
 276  * @cdns: controller
 277  */
 278 int cdns3_hw_role_switch(struct cdns3 *cdns)
 279 {
 280         enum usb_role real_role, current_role;
 281         int ret = 0;
 282
 283         /* Depends on role switch class */
 284         if (cdns->role_sw)
 285                 return 0;
 286
 287         pm_runtime_get_sync(cdns->dev);
 288
 289         current_role = cdns->role;
 290         real_role = cdns3_hw_role_state_machine(cdns);
 291
 292         /* Do nothing if nothing changed */
 293         if (current_role == real_role)
 294                 goto exit;
 295
 296         cdns3_role_stop(cdns);
 297
 298         dev_dbg(cdns->dev, "Switching role %d -> %d", current_role, real_role);
 299
 300         ret = cdns3_role_start(cdns, real_role);
 301         if (ret) {
 302                 /* Back to current role */
 303                 dev_err(cdns->dev, "set %d has failed, back to %d\n",
 304                         real_role, current_role);
 305                 ret = cdns3_role_start(cdns, current_role);
 306                 if (ret)
 307                         dev_err(cdns->dev, "back to %d failed too\n",
 308                                 current_role);
 309         }
 310 exit:
 311         pm_runtime_put_sync(cdns->dev);
 312         return ret;
 313 }
 314
 315 /**
 316  * cdsn3_role_get - get current role of controller.
 317  *
 318  * @sw: pointer to USB role switch structure
 319  *
 320  * Returns role
 321  */
 322 static enum usb_role cdns3_role_get(struct usb_role_switch *sw)
 323 {
 324         struct cdns3 *cdns = usb_role_switch_get_drvdata(sw);
 325
 326         return cdns->role;
 327 }
 328
 329 /**
 330  * cdns3_role_set - set current role of controller.
 331  *
 332  * @sw: pointer to USB role switch structure
 333  * @role: the previous role
 334  * Handles below events:
 335  * - Role switch for dual-role devices
 336  * - USB_ROLE_GADGET <--> USB_ROLE_NONE for peripheral-only devices
 337  */
 338 static int cdns3_role_set(struct usb_role_switch *sw, enum usb_role role)
 339 {
 340         struct cdns3 *cdns = usb_role_switch_get_drvdata(sw);
 341         int ret = 0;
 342
 343         pm_runtime_get_sync(cdns->dev);
 344
 345         if (cdns->role == role)
 346                 goto pm_put;
 347
 348         if (cdns->dr_mode == USB_DR_MODE_HOST) {
 349                 switch (role) {
 350                 case USB_ROLE_NONE:
 351                 case USB_ROLE_HOST:
 352                         break;
 353                 default:
 354                         goto pm_put;
 355                 }
 356         }
 357
 358         if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL) {
 359                 switch (role) {
 360                 case USB_ROLE_NONE:
 361                 case USB_ROLE_DEVICE:
 362                         break;
 363                 default:
 364                         goto pm_put;
 365                 }
 366         }
 367
 368         cdns3_role_stop(cdns);
 369         ret = cdns3_role_start(cdns, role);
 370         if (ret)
 371                 dev_err(cdns->dev, "set role %d has failed\n", role);
 372
 373 pm_put:
 374         pm_runtime_put_sync(cdns->dev);
 375         return ret;
 376 }
 377
 378 static int set_phy_power_on(struct cdns3 *cdns)
 379 {
 380         int ret;
 381
 382         ret = phy_power_on(cdns->usb2_phy);
 383         if (ret)
 384                 return ret;
 385
 386         ret = phy_power_on(cdns->usb3_phy);
 387         if (ret)
 388                 phy_power_off(cdns->usb2_phy);
 389
 390         return ret;
 391 }
 392
 393 static void set_phy_power_off(struct cdns3 *cdns)
 394 {
 395         phy_power_off(cdns->usb3_phy);
 396         phy_power_off(cdns->usb2_phy);
 397 }
 398
 399 /**
 400  * cdns3_wakeup_irq - interrupt handler for wakeup events
 401  * @irq: irq number for cdns3 core device
 402  * @data: structure of cdns3
 403  *
 404  * Returns IRQ_HANDLED or IRQ_NONE
 405  */
 406 static irqreturn_t cdns3_wakeup_irq(int irq, void *data)
 407 {
 408         struct cdns3 *cdns = data;
 409
 410         if (cdns->in_lpm) {
 411                 disable_irq_nosync(irq);
 412                 cdns->wakeup_pending = true;
 413                 if ((cdns->role == USB_ROLE_HOST) && cdns->host_dev)
 414                         pm_request_resume(&cdns->host_dev->dev);
 415
 416                 return IRQ_HANDLED;
 417         }
 418
 419         return IRQ_NONE;
 420 }
 421
 422 /**
 423  * cdns3_probe - probe for cdns3 core device
 424  * @pdev: Pointer to cdns3 core platform device
 425  *
 426  * Returns 0 on success otherwise negative errno
 427  */
 428 static int cdns3_probe(struct platform_device *pdev)
 429 {
 430         struct device *dev = &pdev->dev;
 431         struct resource *res;
 432         struct cdns3 *cdns;
 433         void __iomem *regs;
 434         int ret;
 435
 436         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 437         if (ret) {
 438                 dev_err(dev, "error setting dma mask: %d\n", ret);
 439                 return ret;
 440         }
 441
 442         cdns = devm_kzalloc(dev, sizeof(*cdns), GFP_KERNEL);
 443         if (!cdns)
 444                 return -ENOMEM;
 445
 446         cdns->dev = dev;
 447         cdns->pdata = dev_get_platdata(dev);
 448
 449         platform_set_drvdata(pdev, cdns);
 450
 451         res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "host");
 452         if (!res) {
 453                 dev_err(dev, "missing host IRQ\n");
 454                 return -ENODEV;
 455         }
 456
 457         cdns->xhci_res[0] = *res;
 458
 459         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
 460         if (!res) {
 461                 dev_err(dev, "couldn't get xhci resource\n");
 462                 return -ENXIO;
 463         }
 464
 465         cdns->xhci_res[1] = *res;
 466
 467         cdns->dev_irq = platform_get_irq_byname(pdev, "peripheral");
 468         if (cdns->dev_irq == -EPROBE_DEFER)
 469                 return cdns->dev_irq;
 470
 471         if (cdns->dev_irq < 0)
 472                 dev_err(dev, "couldn't get peripheral irq\n");
 473
 474         regs = devm_platform_ioremap_resource_byname(pdev, "dev");
 475         if (IS_ERR(regs))
 476                 return PTR_ERR(regs);
 477         cdns->dev_regs  = regs;
 478
 479         cdns->otg_irq = platform_get_irq_byname(pdev, "otg");
 480         if (cdns->otg_irq == -EPROBE_DEFER)
 481                 return cdns->otg_irq;
 482
 483         if (cdns->otg_irq < 0) {
 484                 dev_err(dev, "couldn't get otg irq\n");
 485                 return cdns->otg_irq;
 486         }
 487
 488         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
 489         if (!res) {
 490                 dev_err(dev, "couldn't get otg resource\n");
 491                 return -ENXIO;
 492         }
 493
 494         cdns->phyrst_a_enable = device_property_read_bool(dev, "cdns,phyrst-a-enable");
 495
 496         cdns->otg_res = *res;
 497
 498         cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
 499         if (cdns->wakeup_irq == -EPROBE_DEFER)
 500                 return cdns->wakeup_irq;
 501         else if (cdns->wakeup_irq == 0)
 502                 return -EINVAL;
 503
 504         if (cdns->wakeup_irq < 0) {
 505                 dev_dbg(dev, "couldn't get wakeup irq\n");
 506                 cdns->wakeup_irq = 0x0;
 507         }
 508
 509         mutex_init(&cdns->mutex);
 510
 511         cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
 512         if (IS_ERR(cdns->usb2_phy))
 513                 return PTR_ERR(cdns->usb2_phy);
 514
 515         ret = phy_init(cdns->usb2_phy);
 516         if (ret)
 517                 return ret;
 518
 519         cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy");
 520         if (IS_ERR(cdns->usb3_phy))
 521                 return PTR_ERR(cdns->usb3_phy);
 522
 523         ret = phy_init(cdns->usb3_phy);
 524         if (ret)
 525                 goto err1;
 526
 527         ret = set_phy_power_on(cdns);
 528         if (ret)
 529                 goto err2;
 530
 531         if (device_property_read_bool(dev, "usb-role-switch")) {
 532                 struct usb_role_switch_desc sw_desc = { };
 533
 534                 sw_desc.set = cdns3_role_set;
 535                 sw_desc.get = cdns3_role_get;
 536                 sw_desc.allow_userspace_control = true;
 537                 sw_desc.driver_data = cdns;
 538                 sw_desc.fwnode = dev->fwnode;
 539
 540                 cdns->role_sw = usb_role_switch_register(dev, &sw_desc);
 541                 if (IS_ERR(cdns->role_sw)) {
 542                         ret = PTR_ERR(cdns->role_sw);
 543                         dev_warn(dev, "Unable to register Role Switch\n");
 544                         goto err3;
 545                 }
 546         }
 547
 548         if (cdns->wakeup_irq) {
 549                 ret = devm_request_irq(cdns->dev, cdns->wakeup_irq,
 550                                                 cdns3_wakeup_irq,
 551                                                 IRQF_SHARED,
 552                                                 dev_name(cdns->dev), cdns);
 553
 554                 if (ret) {
 555                         dev_err(cdns->dev, "couldn't register wakeup irq handler\n");
 556                         goto err4;
 557                 }
 558         }
 559
 560         ret = cdns3_drd_init(cdns);
 561         if (ret)
 562                 goto err4;
 563
 564         ret = cdns3_core_init_role(cdns);
 565         if (ret)
 566                 goto err4;
 567
 568         spin_lock_init(&cdns->lock);
 569         device_set_wakeup_capable(dev, true);
 570         pm_runtime_set_active(dev);
 571         pm_runtime_enable(dev);
 572         if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)))
 573                 pm_runtime_forbid(dev);
 574
 575         /*
 576          * The controller needs less time between bus and controller suspend,
 577          * and we also needs a small delay to avoid frequently entering low
 578          * power mode.
 579          */
 580         pm_runtime_set_autosuspend_delay(dev, 20);
 581         pm_runtime_mark_last_busy(dev);
 582         pm_runtime_use_autosuspend(dev);
 583         dev_dbg(dev, "Cadence USB3 core: probe succeed\n");
 584
 585         return 0;
 586 err4:
 587         cdns3_drd_exit(cdns);
 588         if (cdns->role_sw)
 589                 usb_role_switch_unregister(cdns->role_sw);
 590 err3:
 591         set_phy_power_off(cdns);
 592 err2:
 593         phy_exit(cdns->usb3_phy);
 594 err1:
 595         phy_exit(cdns->usb2_phy);
 596
 597         return ret;
 598 }
 599
 600 /**
 601  * cdns3_remove - unbind drd driver and clean up
 602  * @pdev: Pointer to Linux platform device
 603  *
 604  * Returns 0 on success otherwise negative errno
 605  */
 606 static int cdns3_remove(struct platform_device *pdev)
 607 {
 608         struct cdns3 *cdns = platform_get_drvdata(pdev);
 609
 610         pm_runtime_get_sync(&pdev->dev);
 611         pm_runtime_disable(&pdev->dev);
 612         pm_runtime_put_noidle(&pdev->dev);
 613         cdns3_exit_roles(cdns);
 614         usb_role_switch_unregister(cdns->role_sw);
 615         set_phy_power_off(cdns);
 616         phy_exit(cdns->usb2_phy);
 617         phy_exit(cdns->usb3_phy);
 618         return 0;
 619 }
 620
 621 #ifdef CONFIG_PM
 622
 623 static int cdns3_set_platform_suspend(struct device *dev,
 624                 bool suspend, bool wakeup)
 625 {
 626         struct cdns3 *cdns = dev_get_drvdata(dev);
 627         int ret = 0;
 628
 629         if (cdns->pdata && cdns->pdata->platform_suspend)
 630                 ret = cdns->pdata->platform_suspend(dev, suspend, wakeup);
 631
 632         return ret;
 633 }
 634
 635 static int cdns3_controller_suspend(struct device *dev, pm_message_t msg)
 636 {
 637         struct cdns3 *cdns = dev_get_drvdata(dev);
 638         bool wakeup;
 639         unsigned long flags;
 640
 641         if (cdns->in_lpm)
 642                 return 0;
 643
 644         if (PMSG_IS_AUTO(msg))
 645                 wakeup = true;
 646         else
 647                 wakeup = device_may_wakeup(dev);
 648
 649         cdns3_set_platform_suspend(cdns->dev, true, wakeup);
 650         set_phy_power_off(cdns);
 651         spin_lock_irqsave(&cdns->lock, flags);
 652         cdns->in_lpm = true;
 653         spin_unlock_irqrestore(&cdns->lock, flags);
 654         dev_dbg(cdns->dev, "%s ends\n", __func__);
 655
 656         return 0;
 657 }
 658
 659 static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
 660 {
 661         struct cdns3 *cdns = dev_get_drvdata(dev);
 662         int ret;
 663         unsigned long flags;
 664
 665         if (!cdns->in_lpm)
 666                 return 0;
 667
 668         ret = set_phy_power_on(cdns);
 669         if (ret)
 670                 return ret;
 671
 672         cdns3_set_platform_suspend(cdns->dev, false, false);
 673
 674         spin_lock_irqsave(&cdns->lock, flags);
 675         if (cdns->roles[cdns->role]->resume && !PMSG_IS_AUTO(msg))
 676                 cdns->roles[cdns->role]->resume(cdns, false);
 677
 678         cdns->in_lpm = false;
 679         spin_unlock_irqrestore(&cdns->lock, flags);
 680         if (cdns->wakeup_pending) {
 681                 cdns->wakeup_pending = false;
 682                 enable_irq(cdns->wakeup_irq);
 683         }
 684         dev_dbg(cdns->dev, "%s ends\n", __func__);
 685
 686         return ret;
 687 }
 688
 689 static int cdns3_runtime_suspend(struct device *dev)
 690 {
 691         return cdns3_controller_suspend(dev, PMSG_AUTO_SUSPEND);
 692 }
 693
 694 static int cdns3_runtime_resume(struct device *dev)
 695 {
 696         return cdns3_controller_resume(dev, PMSG_AUTO_RESUME);
 697 }
 698 #ifdef CONFIG_PM_SLEEP
 699
 700 static int cdns3_suspend(struct device *dev)
 701 {
 702         struct cdns3 *cdns = dev_get_drvdata(dev);
 703         unsigned long flags;
 704
 705         if (pm_runtime_status_suspended(dev))
 706                 pm_runtime_resume(dev);
 707
 708         if (cdns->roles[cdns->role]->suspend) {
 709                 spin_lock_irqsave(&cdns->lock, flags);
 710                 cdns->roles[cdns->role]->suspend(cdns, false);
 711                 spin_unlock_irqrestore(&cdns->lock, flags);
 712         }
 713
 714         return cdns3_controller_suspend(dev, PMSG_SUSPEND);
 715 }
 716
 717 static int cdns3_resume(struct device *dev)
 718 {
 719         int ret;
 720
 721         ret = cdns3_controller_resume(dev, PMSG_RESUME);
 722         if (ret)
 723                 return ret;
 724
 725         pm_runtime_disable(dev);
 726         pm_runtime_set_active(dev);
 727         pm_runtime_enable(dev);
 728
 729         return ret;
 730 }
 731 #endif /* CONFIG_PM_SLEEP */
 732 #endif /* CONFIG_PM */
 733
 734 static const struct dev_pm_ops cdns3_pm_ops = {
 735         SET_SYSTEM_SLEEP_PM_OPS(cdns3_suspend, cdns3_resume)
 736         SET_RUNTIME_PM_OPS(cdns3_runtime_suspend, cdns3_runtime_resume, NULL)
 737 };
 738
 739 #ifdef CONFIG_OF
 740 static const struct of_device_id of_cdns3_match[] = {
 741         { .compatible = "cdns,usb3" },
 742         { },
 743 };
 744 MODULE_DEVICE_TABLE(of, of_cdns3_match);
 745 #endif
 746
 747 static struct platform_driver cdns3_driver = {
 748         .probe          = cdns3_probe,
 749         .remove         = cdns3_remove,
 750         .driver         = {
 751                 .name   = "cdns-usb3",
 752                 .of_match_table = of_match_ptr(of_cdns3_match),
 753                 .pm     = &cdns3_pm_ops,
 754         },
 755 };
 756
 757 module_platform_driver(cdns3_driver);
 758
 759 MODULE_ALIAS("platform:cdns3");
 760 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
 761 MODULE_LICENSE("GPL v2");
 762 MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver");