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 < 0) 469 return cdns->dev_irq; 470 471 regs = devm_platform_ioremap_resource_byname(pdev, "dev"); 472 if (IS_ERR(regs)) 473 return PTR_ERR(regs); 474 cdns->dev_regs = regs; 475 476 cdns->otg_irq = platform_get_irq_byname(pdev, "otg"); 477 if (cdns->otg_irq < 0) 478 return cdns->otg_irq; 479 480 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg"); 481 if (!res) { 482 dev_err(dev, "couldn't get otg resource\n"); 483 return -ENXIO; 484 } 485 486 cdns->phyrst_a_enable = device_property_read_bool(dev, "cdns,phyrst-a-enable"); 487 488 cdns->otg_res = *res; 489 490 cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup"); 491 if (cdns->wakeup_irq == -EPROBE_DEFER) 492 return cdns->wakeup_irq; 493 else if (cdns->wakeup_irq == 0) 494 return -EINVAL; 495 496 if (cdns->wakeup_irq < 0) { 497 dev_dbg(dev, "couldn't get wakeup irq\n"); 498 cdns->wakeup_irq = 0x0; 499 } 500 501 mutex_init(&cdns->mutex); 502 503 cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy"); 504 if (IS_ERR(cdns->usb2_phy)) 505 return PTR_ERR(cdns->usb2_phy); 506 507 ret = phy_init(cdns->usb2_phy); 508 if (ret) 509 return ret; 510 511 cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy"); 512 if (IS_ERR(cdns->usb3_phy)) 513 return PTR_ERR(cdns->usb3_phy); 514 515 ret = phy_init(cdns->usb3_phy); 516 if (ret) 517 goto err1; 518 519 ret = set_phy_power_on(cdns); 520 if (ret) 521 goto err2; 522 523 if (device_property_read_bool(dev, "usb-role-switch")) { 524 struct usb_role_switch_desc sw_desc = { }; 525 526 sw_desc.set = cdns3_role_set; 527 sw_desc.get = cdns3_role_get; 528 sw_desc.allow_userspace_control = true; 529 sw_desc.driver_data = cdns; 530 sw_desc.fwnode = dev->fwnode; 531 532 cdns->role_sw = usb_role_switch_register(dev, &sw_desc); 533 if (IS_ERR(cdns->role_sw)) { 534 ret = PTR_ERR(cdns->role_sw); 535 dev_warn(dev, "Unable to register Role Switch\n"); 536 goto err3; 537 } 538 } 539 540 if (cdns->wakeup_irq) { 541 ret = devm_request_irq(cdns->dev, cdns->wakeup_irq, 542 cdns3_wakeup_irq, 543 IRQF_SHARED, 544 dev_name(cdns->dev), cdns); 545 546 if (ret) { 547 dev_err(cdns->dev, "couldn't register wakeup irq handler\n"); 548 goto err4; 549 } 550 } 551 552 ret = cdns3_drd_init(cdns); 553 if (ret) 554 goto err4; 555 556 ret = cdns3_core_init_role(cdns); 557 if (ret) 558 goto err4; 559 560 spin_lock_init(&cdns->lock); 561 device_set_wakeup_capable(dev, true); 562 pm_runtime_set_active(dev); 563 pm_runtime_enable(dev); 564 if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))) 565 pm_runtime_forbid(dev); 566 567 /* 568 * The controller needs less time between bus and controller suspend, 569 * and we also needs a small delay to avoid frequently entering low 570 * power mode. 571 */ 572 pm_runtime_set_autosuspend_delay(dev, 20); 573 pm_runtime_mark_last_busy(dev); 574 pm_runtime_use_autosuspend(dev); 575 dev_dbg(dev, "Cadence USB3 core: probe succeed\n"); 576 577 return 0; 578 err4: 579 cdns3_drd_exit(cdns); 580 if (cdns->role_sw) 581 usb_role_switch_unregister(cdns->role_sw); 582 err3: 583 set_phy_power_off(cdns); 584 err2: 585 phy_exit(cdns->usb3_phy); 586 err1: 587 phy_exit(cdns->usb2_phy); 588 589 return ret; 590 } 591 592 /** 593 * cdns3_remove - unbind drd driver and clean up 594 * @pdev: Pointer to Linux platform device 595 * 596 * Returns 0 on success otherwise negative errno 597 */ 598 static int cdns3_remove(struct platform_device *pdev) 599 { 600 struct cdns3 *cdns = platform_get_drvdata(pdev); 601 602 pm_runtime_get_sync(&pdev->dev); 603 pm_runtime_disable(&pdev->dev); 604 pm_runtime_put_noidle(&pdev->dev); 605 cdns3_exit_roles(cdns); 606 usb_role_switch_unregister(cdns->role_sw); 607 set_phy_power_off(cdns); 608 phy_exit(cdns->usb2_phy); 609 phy_exit(cdns->usb3_phy); 610 return 0; 611 } 612 613 #ifdef CONFIG_PM 614 615 static int cdns3_set_platform_suspend(struct device *dev, 616 bool suspend, bool wakeup) 617 { 618 struct cdns3 *cdns = dev_get_drvdata(dev); 619 int ret = 0; 620 621 if (cdns->pdata && cdns->pdata->platform_suspend) 622 ret = cdns->pdata->platform_suspend(dev, suspend, wakeup); 623 624 return ret; 625 } 626 627 static int cdns3_controller_suspend(struct device *dev, pm_message_t msg) 628 { 629 struct cdns3 *cdns = dev_get_drvdata(dev); 630 bool wakeup; 631 unsigned long flags; 632 633 if (cdns->in_lpm) 634 return 0; 635 636 if (PMSG_IS_AUTO(msg)) 637 wakeup = true; 638 else 639 wakeup = device_may_wakeup(dev); 640 641 cdns3_set_platform_suspend(cdns->dev, true, wakeup); 642 set_phy_power_off(cdns); 643 spin_lock_irqsave(&cdns->lock, flags); 644 cdns->in_lpm = true; 645 spin_unlock_irqrestore(&cdns->lock, flags); 646 dev_dbg(cdns->dev, "%s ends\n", __func__); 647 648 return 0; 649 } 650 651 static int cdns3_controller_resume(struct device *dev, pm_message_t msg) 652 { 653 struct cdns3 *cdns = dev_get_drvdata(dev); 654 int ret; 655 unsigned long flags; 656 657 if (!cdns->in_lpm) 658 return 0; 659 660 ret = set_phy_power_on(cdns); 661 if (ret) 662 return ret; 663 664 cdns3_set_platform_suspend(cdns->dev, false, false); 665 666 spin_lock_irqsave(&cdns->lock, flags); 667 if (cdns->roles[cdns->role]->resume && !PMSG_IS_AUTO(msg)) 668 cdns->roles[cdns->role]->resume(cdns, false); 669 670 cdns->in_lpm = false; 671 spin_unlock_irqrestore(&cdns->lock, flags); 672 if (cdns->wakeup_pending) { 673 cdns->wakeup_pending = false; 674 enable_irq(cdns->wakeup_irq); 675 } 676 dev_dbg(cdns->dev, "%s ends\n", __func__); 677 678 return ret; 679 } 680 681 static int cdns3_runtime_suspend(struct device *dev) 682 { 683 return cdns3_controller_suspend(dev, PMSG_AUTO_SUSPEND); 684 } 685 686 static int cdns3_runtime_resume(struct device *dev) 687 { 688 return cdns3_controller_resume(dev, PMSG_AUTO_RESUME); 689 } 690 #ifdef CONFIG_PM_SLEEP 691 692 static int cdns3_suspend(struct device *dev) 693 { 694 struct cdns3 *cdns = dev_get_drvdata(dev); 695 unsigned long flags; 696 697 if (pm_runtime_status_suspended(dev)) 698 pm_runtime_resume(dev); 699 700 if (cdns->roles[cdns->role]->suspend) { 701 spin_lock_irqsave(&cdns->lock, flags); 702 cdns->roles[cdns->role]->suspend(cdns, false); 703 spin_unlock_irqrestore(&cdns->lock, flags); 704 } 705 706 return cdns3_controller_suspend(dev, PMSG_SUSPEND); 707 } 708 709 static int cdns3_resume(struct device *dev) 710 { 711 int ret; 712 713 ret = cdns3_controller_resume(dev, PMSG_RESUME); 714 if (ret) 715 return ret; 716 717 pm_runtime_disable(dev); 718 pm_runtime_set_active(dev); 719 pm_runtime_enable(dev); 720 721 return ret; 722 } 723 #endif /* CONFIG_PM_SLEEP */ 724 #endif /* CONFIG_PM */ 725 726 static const struct dev_pm_ops cdns3_pm_ops = { 727 SET_SYSTEM_SLEEP_PM_OPS(cdns3_suspend, cdns3_resume) 728 SET_RUNTIME_PM_OPS(cdns3_runtime_suspend, cdns3_runtime_resume, NULL) 729 }; 730 731 #ifdef CONFIG_OF 732 static const struct of_device_id of_cdns3_match[] = { 733 { .compatible = "cdns,usb3" }, 734 { }, 735 }; 736 MODULE_DEVICE_TABLE(of, of_cdns3_match); 737 #endif 738 739 static struct platform_driver cdns3_driver = { 740 .probe = cdns3_probe, 741 .remove = cdns3_remove, 742 .driver = { 743 .name = "cdns-usb3", 744 .of_match_table = of_match_ptr(of_cdns3_match), 745 .pm = &cdns3_pm_ops, 746 }, 747 }; 748 749 module_platform_driver(cdns3_driver); 750 751 MODULE_ALIAS("platform:cdns3"); 752 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>"); 753 MODULE_LICENSE("GPL v2"); 754 MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver"); 755