1 /* 2 * Renesas USB driver 3 * 4 * Copyright (C) 2011 Renesas Solutions Corp. 5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 15 * 16 */ 17 #include <linux/err.h> 18 #include <linux/gpio.h> 19 #include <linux/io.h> 20 #include <linux/module.h> 21 #include <linux/of_device.h> 22 #include <linux/of_gpio.h> 23 #include <linux/pm_runtime.h> 24 #include <linux/slab.h> 25 #include <linux/sysfs.h> 26 #include "common.h" 27 #include "rcar2.h" 28 29 /* 30 * image of renesas_usbhs 31 * 32 * ex) gadget case 33 34 * mod.c 35 * mod_gadget.c 36 * mod_host.c pipe.c fifo.c 37 * 38 * +-------+ +-----------+ 39 * | pipe0 |------>| fifo pio | 40 * +------------+ +-------+ +-----------+ 41 * | mod_gadget |=====> | pipe1 |--+ 42 * +------------+ +-------+ | +-----------+ 43 * | pipe2 | | +-| fifo dma0 | 44 * +------------+ +-------+ | | +-----------+ 45 * | mod_host | | pipe3 |<-|--+ 46 * +------------+ +-------+ | +-----------+ 47 * | .... | +--->| fifo dma1 | 48 * | .... | +-----------+ 49 */ 50 51 52 #define USBHSF_RUNTIME_PWCTRL (1 << 0) 53 54 /* status */ 55 #define usbhsc_flags_init(p) do {(p)->flags = 0; } while (0) 56 #define usbhsc_flags_set(p, b) ((p)->flags |= (b)) 57 #define usbhsc_flags_clr(p, b) ((p)->flags &= ~(b)) 58 #define usbhsc_flags_has(p, b) ((p)->flags & (b)) 59 60 /* 61 * platform call back 62 * 63 * renesas usb support platform callback function. 64 * Below macro call it. 65 * if platform doesn't have callback, it return 0 (no error) 66 */ 67 #define usbhs_platform_call(priv, func, args...)\ 68 (!(priv) ? -ENODEV : \ 69 !((priv)->pfunc.func) ? 0 : \ 70 (priv)->pfunc.func(args)) 71 72 /* 73 * common functions 74 */ 75 u16 usbhs_read(struct usbhs_priv *priv, u32 reg) 76 { 77 return ioread16(priv->base + reg); 78 } 79 80 void usbhs_write(struct usbhs_priv *priv, u32 reg, u16 data) 81 { 82 iowrite16(data, priv->base + reg); 83 } 84 85 void usbhs_bset(struct usbhs_priv *priv, u32 reg, u16 mask, u16 data) 86 { 87 u16 val = usbhs_read(priv, reg); 88 89 val &= ~mask; 90 val |= data & mask; 91 92 usbhs_write(priv, reg, val); 93 } 94 95 struct usbhs_priv *usbhs_pdev_to_priv(struct platform_device *pdev) 96 { 97 return dev_get_drvdata(&pdev->dev); 98 } 99 100 /* 101 * syscfg functions 102 */ 103 static void usbhs_sys_clock_ctrl(struct usbhs_priv *priv, int enable) 104 { 105 usbhs_bset(priv, SYSCFG, SCKE, enable ? SCKE : 0); 106 } 107 108 void usbhs_sys_host_ctrl(struct usbhs_priv *priv, int enable) 109 { 110 u16 mask = DCFM | DRPD | DPRPU | HSE | USBE; 111 u16 val = DCFM | DRPD | HSE | USBE; 112 int has_otg = usbhs_get_dparam(priv, has_otg); 113 114 if (has_otg) 115 usbhs_bset(priv, DVSTCTR, (EXTLP | PWEN), (EXTLP | PWEN)); 116 117 /* 118 * if enable 119 * 120 * - select Host mode 121 * - D+ Line/D- Line Pull-down 122 */ 123 usbhs_bset(priv, SYSCFG, mask, enable ? val : 0); 124 } 125 126 void usbhs_sys_function_ctrl(struct usbhs_priv *priv, int enable) 127 { 128 u16 mask = DCFM | DRPD | DPRPU | HSE | USBE; 129 u16 val = HSE | USBE; 130 131 /* 132 * if enable 133 * 134 * - select Function mode 135 * - D+ Line Pull-up is disabled 136 * When D+ Line Pull-up is enabled, 137 * calling usbhs_sys_function_pullup(,1) 138 */ 139 usbhs_bset(priv, SYSCFG, mask, enable ? val : 0); 140 } 141 142 void usbhs_sys_function_pullup(struct usbhs_priv *priv, int enable) 143 { 144 usbhs_bset(priv, SYSCFG, DPRPU, enable ? DPRPU : 0); 145 } 146 147 void usbhs_sys_set_test_mode(struct usbhs_priv *priv, u16 mode) 148 { 149 usbhs_write(priv, TESTMODE, mode); 150 } 151 152 /* 153 * frame functions 154 */ 155 int usbhs_frame_get_num(struct usbhs_priv *priv) 156 { 157 return usbhs_read(priv, FRMNUM) & FRNM_MASK; 158 } 159 160 /* 161 * usb request functions 162 */ 163 void usbhs_usbreq_get_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req) 164 { 165 u16 val; 166 167 val = usbhs_read(priv, USBREQ); 168 req->bRequest = (val >> 8) & 0xFF; 169 req->bRequestType = (val >> 0) & 0xFF; 170 171 req->wValue = usbhs_read(priv, USBVAL); 172 req->wIndex = usbhs_read(priv, USBINDX); 173 req->wLength = usbhs_read(priv, USBLENG); 174 } 175 176 void usbhs_usbreq_set_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req) 177 { 178 usbhs_write(priv, USBREQ, (req->bRequest << 8) | req->bRequestType); 179 usbhs_write(priv, USBVAL, req->wValue); 180 usbhs_write(priv, USBINDX, req->wIndex); 181 usbhs_write(priv, USBLENG, req->wLength); 182 183 usbhs_bset(priv, DCPCTR, SUREQ, SUREQ); 184 } 185 186 /* 187 * bus/vbus functions 188 */ 189 void usbhs_bus_send_sof_enable(struct usbhs_priv *priv) 190 { 191 u16 status = usbhs_read(priv, DVSTCTR) & (USBRST | UACT); 192 193 if (status != USBRST) { 194 struct device *dev = usbhs_priv_to_dev(priv); 195 dev_err(dev, "usbhs should be reset\n"); 196 } 197 198 usbhs_bset(priv, DVSTCTR, (USBRST | UACT), UACT); 199 } 200 201 void usbhs_bus_send_reset(struct usbhs_priv *priv) 202 { 203 usbhs_bset(priv, DVSTCTR, (USBRST | UACT), USBRST); 204 } 205 206 int usbhs_bus_get_speed(struct usbhs_priv *priv) 207 { 208 u16 dvstctr = usbhs_read(priv, DVSTCTR); 209 210 switch (RHST & dvstctr) { 211 case RHST_LOW_SPEED: 212 return USB_SPEED_LOW; 213 case RHST_FULL_SPEED: 214 return USB_SPEED_FULL; 215 case RHST_HIGH_SPEED: 216 return USB_SPEED_HIGH; 217 } 218 219 return USB_SPEED_UNKNOWN; 220 } 221 222 int usbhs_vbus_ctrl(struct usbhs_priv *priv, int enable) 223 { 224 struct platform_device *pdev = usbhs_priv_to_pdev(priv); 225 226 return usbhs_platform_call(priv, set_vbus, pdev, enable); 227 } 228 229 static void usbhsc_bus_init(struct usbhs_priv *priv) 230 { 231 usbhs_write(priv, DVSTCTR, 0); 232 233 usbhs_vbus_ctrl(priv, 0); 234 } 235 236 /* 237 * device configuration 238 */ 239 int usbhs_set_device_config(struct usbhs_priv *priv, int devnum, 240 u16 upphub, u16 hubport, u16 speed) 241 { 242 struct device *dev = usbhs_priv_to_dev(priv); 243 u16 usbspd = 0; 244 u32 reg = DEVADD0 + (2 * devnum); 245 246 if (devnum > 10) { 247 dev_err(dev, "cannot set speed to unknown device %d\n", devnum); 248 return -EIO; 249 } 250 251 if (upphub > 0xA) { 252 dev_err(dev, "unsupported hub number %d\n", upphub); 253 return -EIO; 254 } 255 256 switch (speed) { 257 case USB_SPEED_LOW: 258 usbspd = USBSPD_SPEED_LOW; 259 break; 260 case USB_SPEED_FULL: 261 usbspd = USBSPD_SPEED_FULL; 262 break; 263 case USB_SPEED_HIGH: 264 usbspd = USBSPD_SPEED_HIGH; 265 break; 266 default: 267 dev_err(dev, "unsupported speed %d\n", speed); 268 return -EIO; 269 } 270 271 usbhs_write(priv, reg, UPPHUB(upphub) | 272 HUBPORT(hubport)| 273 USBSPD(usbspd)); 274 275 return 0; 276 } 277 278 /* 279 * local functions 280 */ 281 static void usbhsc_set_buswait(struct usbhs_priv *priv) 282 { 283 int wait = usbhs_get_dparam(priv, buswait_bwait); 284 285 /* set bus wait if platform have */ 286 if (wait) 287 usbhs_bset(priv, BUSWAIT, 0x000F, wait); 288 } 289 290 /* 291 * platform default param 292 */ 293 294 /* commonly used on old SH-Mobile SoCs */ 295 static u32 usbhsc_default_pipe_type[] = { 296 USB_ENDPOINT_XFER_CONTROL, 297 USB_ENDPOINT_XFER_ISOC, 298 USB_ENDPOINT_XFER_ISOC, 299 USB_ENDPOINT_XFER_BULK, 300 USB_ENDPOINT_XFER_BULK, 301 USB_ENDPOINT_XFER_BULK, 302 USB_ENDPOINT_XFER_INT, 303 USB_ENDPOINT_XFER_INT, 304 USB_ENDPOINT_XFER_INT, 305 USB_ENDPOINT_XFER_INT, 306 }; 307 308 /* commonly used on newer SH-Mobile and R-Car SoCs */ 309 static u32 usbhsc_new_pipe_type[] = { 310 USB_ENDPOINT_XFER_CONTROL, 311 USB_ENDPOINT_XFER_ISOC, 312 USB_ENDPOINT_XFER_ISOC, 313 USB_ENDPOINT_XFER_BULK, 314 USB_ENDPOINT_XFER_BULK, 315 USB_ENDPOINT_XFER_BULK, 316 USB_ENDPOINT_XFER_INT, 317 USB_ENDPOINT_XFER_INT, 318 USB_ENDPOINT_XFER_INT, 319 USB_ENDPOINT_XFER_BULK, 320 USB_ENDPOINT_XFER_BULK, 321 USB_ENDPOINT_XFER_BULK, 322 USB_ENDPOINT_XFER_BULK, 323 USB_ENDPOINT_XFER_BULK, 324 USB_ENDPOINT_XFER_BULK, 325 USB_ENDPOINT_XFER_BULK, 326 }; 327 328 /* 329 * power control 330 */ 331 static void usbhsc_power_ctrl(struct usbhs_priv *priv, int enable) 332 { 333 struct platform_device *pdev = usbhs_priv_to_pdev(priv); 334 struct device *dev = usbhs_priv_to_dev(priv); 335 336 if (enable) { 337 /* enable PM */ 338 pm_runtime_get_sync(dev); 339 340 /* enable platform power */ 341 usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable); 342 343 /* USB on */ 344 usbhs_sys_clock_ctrl(priv, enable); 345 } else { 346 /* USB off */ 347 usbhs_sys_clock_ctrl(priv, enable); 348 349 /* disable platform power */ 350 usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable); 351 352 /* disable PM */ 353 pm_runtime_put_sync(dev); 354 } 355 } 356 357 /* 358 * hotplug 359 */ 360 static void usbhsc_hotplug(struct usbhs_priv *priv) 361 { 362 struct platform_device *pdev = usbhs_priv_to_pdev(priv); 363 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 364 int id; 365 int enable; 366 int ret; 367 368 /* 369 * get vbus status from platform 370 */ 371 enable = usbhs_platform_call(priv, get_vbus, pdev); 372 373 /* 374 * get id from platform 375 */ 376 id = usbhs_platform_call(priv, get_id, pdev); 377 378 if (enable && !mod) { 379 ret = usbhs_mod_change(priv, id); 380 if (ret < 0) 381 return; 382 383 dev_dbg(&pdev->dev, "%s enable\n", __func__); 384 385 /* power on */ 386 if (usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL)) 387 usbhsc_power_ctrl(priv, enable); 388 389 /* bus init */ 390 usbhsc_set_buswait(priv); 391 usbhsc_bus_init(priv); 392 393 /* module start */ 394 usbhs_mod_call(priv, start, priv); 395 396 } else if (!enable && mod) { 397 dev_dbg(&pdev->dev, "%s disable\n", __func__); 398 399 /* module stop */ 400 usbhs_mod_call(priv, stop, priv); 401 402 /* bus init */ 403 usbhsc_bus_init(priv); 404 405 /* power off */ 406 if (usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL)) 407 usbhsc_power_ctrl(priv, enable); 408 409 usbhs_mod_change(priv, -1); 410 411 /* reset phy for next connection */ 412 usbhs_platform_call(priv, phy_reset, pdev); 413 } 414 } 415 416 /* 417 * notify hotplug 418 */ 419 static void usbhsc_notify_hotplug(struct work_struct *work) 420 { 421 struct usbhs_priv *priv = container_of(work, 422 struct usbhs_priv, 423 notify_hotplug_work.work); 424 usbhsc_hotplug(priv); 425 } 426 427 static int usbhsc_drvcllbck_notify_hotplug(struct platform_device *pdev) 428 { 429 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev); 430 int delay = usbhs_get_dparam(priv, detection_delay); 431 432 /* 433 * This functions will be called in interrupt. 434 * To make sure safety context, 435 * use workqueue for usbhs_notify_hotplug 436 */ 437 schedule_delayed_work(&priv->notify_hotplug_work, 438 msecs_to_jiffies(delay)); 439 return 0; 440 } 441 442 /* 443 * platform functions 444 */ 445 static const struct of_device_id usbhs_of_match[] = { 446 { 447 .compatible = "renesas,usbhs-r8a7790", 448 .data = (void *)USBHS_TYPE_R8A7790, 449 }, 450 { 451 .compatible = "renesas,usbhs-r8a7791", 452 .data = (void *)USBHS_TYPE_R8A7791, 453 }, 454 { }, 455 }; 456 MODULE_DEVICE_TABLE(of, usbhs_of_match); 457 458 static struct renesas_usbhs_platform_info *usbhs_parse_dt(struct device *dev) 459 { 460 struct renesas_usbhs_platform_info *info; 461 struct renesas_usbhs_driver_param *dparam; 462 const struct of_device_id *of_id = of_match_device(usbhs_of_match, dev); 463 u32 tmp; 464 int gpio; 465 466 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); 467 if (!info) 468 return NULL; 469 470 dparam = &info->driver_param; 471 dparam->type = of_id ? (u32)of_id->data : 0; 472 if (!of_property_read_u32(dev->of_node, "renesas,buswait", &tmp)) 473 dparam->buswait_bwait = tmp; 474 gpio = of_get_named_gpio_flags(dev->of_node, "renesas,enable-gpio", 0, 475 NULL); 476 if (gpio > 0) 477 dparam->enable_gpio = gpio; 478 479 return info; 480 } 481 482 static int usbhs_probe(struct platform_device *pdev) 483 { 484 struct renesas_usbhs_platform_info *info = dev_get_platdata(&pdev->dev); 485 struct renesas_usbhs_driver_callback *dfunc; 486 struct usbhs_priv *priv; 487 struct resource *res, *irq_res; 488 int ret; 489 490 /* check device node */ 491 if (pdev->dev.of_node) 492 info = pdev->dev.platform_data = usbhs_parse_dt(&pdev->dev); 493 494 /* check platform information */ 495 if (!info) { 496 dev_err(&pdev->dev, "no platform information\n"); 497 return -EINVAL; 498 } 499 500 /* platform data */ 501 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 502 if (!irq_res) { 503 dev_err(&pdev->dev, "Not enough Renesas USB platform resources.\n"); 504 return -ENODEV; 505 } 506 507 /* usb private data */ 508 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 509 if (!priv) 510 return -ENOMEM; 511 512 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 513 priv->base = devm_ioremap_resource(&pdev->dev, res); 514 if (IS_ERR(priv->base)) 515 return PTR_ERR(priv->base); 516 517 /* 518 * care platform info 519 */ 520 521 memcpy(&priv->dparam, 522 &info->driver_param, 523 sizeof(struct renesas_usbhs_driver_param)); 524 525 switch (priv->dparam.type) { 526 case USBHS_TYPE_R8A7790: 527 case USBHS_TYPE_R8A7791: 528 priv->pfunc = usbhs_rcar2_ops; 529 if (!priv->dparam.pipe_type) { 530 priv->dparam.pipe_type = usbhsc_new_pipe_type; 531 priv->dparam.pipe_size = 532 ARRAY_SIZE(usbhsc_new_pipe_type); 533 } 534 break; 535 default: 536 if (!info->platform_callback.get_id) { 537 dev_err(&pdev->dev, "no platform callbacks"); 538 return -EINVAL; 539 } 540 memcpy(&priv->pfunc, 541 &info->platform_callback, 542 sizeof(struct renesas_usbhs_platform_callback)); 543 break; 544 } 545 546 /* set driver callback functions for platform */ 547 dfunc = &info->driver_callback; 548 dfunc->notify_hotplug = usbhsc_drvcllbck_notify_hotplug; 549 550 /* set default param if platform doesn't have */ 551 if (!priv->dparam.pipe_type) { 552 priv->dparam.pipe_type = usbhsc_default_pipe_type; 553 priv->dparam.pipe_size = ARRAY_SIZE(usbhsc_default_pipe_type); 554 } 555 if (!priv->dparam.pio_dma_border) 556 priv->dparam.pio_dma_border = 64; /* 64byte */ 557 558 /* FIXME */ 559 /* runtime power control ? */ 560 if (priv->pfunc.get_vbus) 561 usbhsc_flags_set(priv, USBHSF_RUNTIME_PWCTRL); 562 563 /* 564 * priv settings 565 */ 566 priv->irq = irq_res->start; 567 if (irq_res->flags & IORESOURCE_IRQ_SHAREABLE) 568 priv->irqflags = IRQF_SHARED; 569 priv->pdev = pdev; 570 INIT_DELAYED_WORK(&priv->notify_hotplug_work, usbhsc_notify_hotplug); 571 spin_lock_init(usbhs_priv_to_lock(priv)); 572 573 /* call pipe and module init */ 574 ret = usbhs_pipe_probe(priv); 575 if (ret < 0) 576 return ret; 577 578 ret = usbhs_fifo_probe(priv); 579 if (ret < 0) 580 goto probe_end_pipe_exit; 581 582 ret = usbhs_mod_probe(priv); 583 if (ret < 0) 584 goto probe_end_fifo_exit; 585 586 /* dev_set_drvdata should be called after usbhs_mod_init */ 587 platform_set_drvdata(pdev, priv); 588 589 /* 590 * deviece reset here because 591 * USB device might be used in boot loader. 592 */ 593 usbhs_sys_clock_ctrl(priv, 0); 594 595 /* check GPIO determining if USB function should be enabled */ 596 if (priv->dparam.enable_gpio) { 597 gpio_request_one(priv->dparam.enable_gpio, GPIOF_IN, NULL); 598 ret = !gpio_get_value(priv->dparam.enable_gpio); 599 gpio_free(priv->dparam.enable_gpio); 600 if (ret) { 601 dev_warn(&pdev->dev, 602 "USB function not selected (GPIO %d)\n", 603 priv->dparam.enable_gpio); 604 ret = -ENOTSUPP; 605 goto probe_end_mod_exit; 606 } 607 } 608 609 /* 610 * platform call 611 * 612 * USB phy setup might depend on CPU/Board. 613 * If platform has its callback functions, 614 * call it here. 615 */ 616 ret = usbhs_platform_call(priv, hardware_init, pdev); 617 if (ret < 0) { 618 dev_err(&pdev->dev, "platform prove failed.\n"); 619 goto probe_end_mod_exit; 620 } 621 622 /* reset phy for connection */ 623 usbhs_platform_call(priv, phy_reset, pdev); 624 625 /* power control */ 626 pm_runtime_enable(&pdev->dev); 627 if (!usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL)) { 628 usbhsc_power_ctrl(priv, 1); 629 usbhs_mod_autonomy_mode(priv); 630 } 631 632 /* 633 * manual call notify_hotplug for cold plug 634 */ 635 ret = usbhsc_drvcllbck_notify_hotplug(pdev); 636 if (ret < 0) 637 goto probe_end_call_remove; 638 639 dev_info(&pdev->dev, "probed\n"); 640 641 return ret; 642 643 probe_end_call_remove: 644 usbhs_platform_call(priv, hardware_exit, pdev); 645 probe_end_mod_exit: 646 usbhs_mod_remove(priv); 647 probe_end_fifo_exit: 648 usbhs_fifo_remove(priv); 649 probe_end_pipe_exit: 650 usbhs_pipe_remove(priv); 651 652 dev_info(&pdev->dev, "probe failed\n"); 653 654 return ret; 655 } 656 657 static int usbhs_remove(struct platform_device *pdev) 658 { 659 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev); 660 struct renesas_usbhs_platform_info *info = dev_get_platdata(&pdev->dev); 661 struct renesas_usbhs_driver_callback *dfunc = &info->driver_callback; 662 663 dev_dbg(&pdev->dev, "usb remove\n"); 664 665 dfunc->notify_hotplug = NULL; 666 667 /* power off */ 668 if (!usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL)) 669 usbhsc_power_ctrl(priv, 0); 670 671 pm_runtime_disable(&pdev->dev); 672 673 usbhs_platform_call(priv, hardware_exit, pdev); 674 usbhs_mod_remove(priv); 675 usbhs_fifo_remove(priv); 676 usbhs_pipe_remove(priv); 677 678 return 0; 679 } 680 681 static int usbhsc_suspend(struct device *dev) 682 { 683 struct usbhs_priv *priv = dev_get_drvdata(dev); 684 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 685 686 if (mod) { 687 usbhs_mod_call(priv, stop, priv); 688 usbhs_mod_change(priv, -1); 689 } 690 691 if (mod || !usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL)) 692 usbhsc_power_ctrl(priv, 0); 693 694 return 0; 695 } 696 697 static int usbhsc_resume(struct device *dev) 698 { 699 struct usbhs_priv *priv = dev_get_drvdata(dev); 700 struct platform_device *pdev = usbhs_priv_to_pdev(priv); 701 702 if (!usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL)) 703 usbhsc_power_ctrl(priv, 1); 704 705 usbhs_platform_call(priv, phy_reset, pdev); 706 707 usbhsc_drvcllbck_notify_hotplug(pdev); 708 709 return 0; 710 } 711 712 static int usbhsc_runtime_nop(struct device *dev) 713 { 714 /* Runtime PM callback shared between ->runtime_suspend() 715 * and ->runtime_resume(). Simply returns success. 716 * 717 * This driver re-initializes all registers after 718 * pm_runtime_get_sync() anyway so there is no need 719 * to save and restore registers here. 720 */ 721 return 0; 722 } 723 724 static const struct dev_pm_ops usbhsc_pm_ops = { 725 .suspend = usbhsc_suspend, 726 .resume = usbhsc_resume, 727 .runtime_suspend = usbhsc_runtime_nop, 728 .runtime_resume = usbhsc_runtime_nop, 729 }; 730 731 static struct platform_driver renesas_usbhs_driver = { 732 .driver = { 733 .name = "renesas_usbhs", 734 .pm = &usbhsc_pm_ops, 735 .of_match_table = of_match_ptr(usbhs_of_match), 736 }, 737 .probe = usbhs_probe, 738 .remove = usbhs_remove, 739 }; 740 741 module_platform_driver(renesas_usbhs_driver); 742 743 MODULE_LICENSE("GPL"); 744 MODULE_DESCRIPTION("Renesas USB driver"); 745 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); 746