1 /* 2 * OHCI HCD (Host Controller Driver) for USB. 3 * 4 * Copyright (C) 2004 SAN People (Pty) Ltd. 5 * Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org> 6 * 7 * AT91 Bus Glue 8 * 9 * Based on fragments of 2.4 driver by Rick Bronson. 10 * Based on ohci-omap.c 11 * 12 * This file is licenced under the GPL. 13 */ 14 15 #include <linux/clk.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/of_platform.h> 18 #include <linux/of_gpio.h> 19 #include <linux/platform_device.h> 20 #include <linux/platform_data/atmel.h> 21 #include <linux/io.h> 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/mfd/syscon.h> 25 #include <linux/regmap.h> 26 #include <linux/usb.h> 27 #include <linux/usb/hcd.h> 28 #include <soc/at91/atmel-sfr.h> 29 30 #include "ohci.h" 31 32 #define valid_port(index) ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS) 33 #define at91_for_each_port(index) \ 34 for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++) 35 36 /* interface, function and usb clocks; sometimes also an AHB clock */ 37 #define hcd_to_ohci_at91_priv(h) \ 38 ((struct ohci_at91_priv *)hcd_to_ohci(h)->priv) 39 40 #define AT91_MAX_USBH_PORTS 3 41 struct at91_usbh_data { 42 int vbus_pin[AT91_MAX_USBH_PORTS]; /* port power-control pin */ 43 int overcurrent_pin[AT91_MAX_USBH_PORTS]; 44 u8 ports; /* number of ports on root hub */ 45 u8 overcurrent_supported; 46 u8 vbus_pin_active_low[AT91_MAX_USBH_PORTS]; 47 u8 overcurrent_status[AT91_MAX_USBH_PORTS]; 48 u8 overcurrent_changed[AT91_MAX_USBH_PORTS]; 49 }; 50 51 struct ohci_at91_priv { 52 struct clk *iclk; 53 struct clk *fclk; 54 struct clk *hclk; 55 bool clocked; 56 bool wakeup; /* Saved wake-up state for resume */ 57 struct regmap *sfr_regmap; 58 }; 59 /* interface and function clocks; sometimes also an AHB clock */ 60 61 #define DRIVER_DESC "OHCI Atmel driver" 62 63 static const char hcd_name[] = "ohci-atmel"; 64 65 static struct hc_driver __read_mostly ohci_at91_hc_driver; 66 67 static const struct ohci_driver_overrides ohci_at91_drv_overrides __initconst = { 68 .extra_priv_size = sizeof(struct ohci_at91_priv), 69 }; 70 71 extern int usb_disabled(void); 72 73 /*-------------------------------------------------------------------------*/ 74 75 static void at91_start_clock(struct ohci_at91_priv *ohci_at91) 76 { 77 if (ohci_at91->clocked) 78 return; 79 80 clk_set_rate(ohci_at91->fclk, 48000000); 81 clk_prepare_enable(ohci_at91->hclk); 82 clk_prepare_enable(ohci_at91->iclk); 83 clk_prepare_enable(ohci_at91->fclk); 84 ohci_at91->clocked = true; 85 } 86 87 static void at91_stop_clock(struct ohci_at91_priv *ohci_at91) 88 { 89 if (!ohci_at91->clocked) 90 return; 91 92 clk_disable_unprepare(ohci_at91->fclk); 93 clk_disable_unprepare(ohci_at91->iclk); 94 clk_disable_unprepare(ohci_at91->hclk); 95 ohci_at91->clocked = false; 96 } 97 98 static void at91_start_hc(struct platform_device *pdev) 99 { 100 struct usb_hcd *hcd = platform_get_drvdata(pdev); 101 struct ohci_regs __iomem *regs = hcd->regs; 102 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); 103 104 dev_dbg(&pdev->dev, "start\n"); 105 106 /* 107 * Start the USB clocks. 108 */ 109 at91_start_clock(ohci_at91); 110 111 /* 112 * The USB host controller must remain in reset. 113 */ 114 writel(0, ®s->control); 115 } 116 117 static void at91_stop_hc(struct platform_device *pdev) 118 { 119 struct usb_hcd *hcd = platform_get_drvdata(pdev); 120 struct ohci_regs __iomem *regs = hcd->regs; 121 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); 122 123 dev_dbg(&pdev->dev, "stop\n"); 124 125 /* 126 * Put the USB host controller into reset. 127 */ 128 writel(0, ®s->control); 129 130 /* 131 * Stop the USB clocks. 132 */ 133 at91_stop_clock(ohci_at91); 134 } 135 136 137 /*-------------------------------------------------------------------------*/ 138 139 static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *); 140 141 static struct regmap *at91_dt_syscon_sfr(void) 142 { 143 struct regmap *regmap; 144 145 regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-sfr"); 146 if (IS_ERR(regmap)) 147 regmap = NULL; 148 149 return regmap; 150 } 151 152 /* configure so an HC device and id are always provided */ 153 /* always called with process context; sleeping is OK */ 154 155 156 /** 157 * usb_hcd_at91_probe - initialize AT91-based HCDs 158 * Context: !in_interrupt() 159 * 160 * Allocates basic resources for this USB host controller, and 161 * then invokes the start() method for the HCD associated with it 162 * through the hotplug entry's driver_data. 163 */ 164 static int usb_hcd_at91_probe(const struct hc_driver *driver, 165 struct platform_device *pdev) 166 { 167 struct at91_usbh_data *board; 168 struct ohci_hcd *ohci; 169 int retval; 170 struct usb_hcd *hcd; 171 struct ohci_at91_priv *ohci_at91; 172 struct device *dev = &pdev->dev; 173 struct resource *res; 174 int irq; 175 176 irq = platform_get_irq(pdev, 0); 177 if (irq < 0) { 178 dev_dbg(dev, "hcd probe: missing irq resource\n"); 179 return irq; 180 } 181 182 hcd = usb_create_hcd(driver, dev, "at91"); 183 if (!hcd) 184 return -ENOMEM; 185 ohci_at91 = hcd_to_ohci_at91_priv(hcd); 186 187 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 188 hcd->regs = devm_ioremap_resource(dev, res); 189 if (IS_ERR(hcd->regs)) { 190 retval = PTR_ERR(hcd->regs); 191 goto err; 192 } 193 hcd->rsrc_start = res->start; 194 hcd->rsrc_len = resource_size(res); 195 196 ohci_at91->iclk = devm_clk_get(dev, "ohci_clk"); 197 if (IS_ERR(ohci_at91->iclk)) { 198 dev_err(dev, "failed to get ohci_clk\n"); 199 retval = PTR_ERR(ohci_at91->iclk); 200 goto err; 201 } 202 ohci_at91->fclk = devm_clk_get(dev, "uhpck"); 203 if (IS_ERR(ohci_at91->fclk)) { 204 dev_err(dev, "failed to get uhpck\n"); 205 retval = PTR_ERR(ohci_at91->fclk); 206 goto err; 207 } 208 ohci_at91->hclk = devm_clk_get(dev, "hclk"); 209 if (IS_ERR(ohci_at91->hclk)) { 210 dev_err(dev, "failed to get hclk\n"); 211 retval = PTR_ERR(ohci_at91->hclk); 212 goto err; 213 } 214 215 ohci_at91->sfr_regmap = at91_dt_syscon_sfr(); 216 if (!ohci_at91->sfr_regmap) 217 dev_warn(dev, "failed to find sfr node\n"); 218 219 board = hcd->self.controller->platform_data; 220 ohci = hcd_to_ohci(hcd); 221 ohci->num_ports = board->ports; 222 at91_start_hc(pdev); 223 224 /* 225 * The RemoteWakeupConnected bit has to be set explicitly 226 * before calling ohci_run. The reset value of this bit is 0. 227 */ 228 ohci->hc_control = OHCI_CTRL_RWC; 229 230 retval = usb_add_hcd(hcd, irq, IRQF_SHARED); 231 if (retval == 0) { 232 device_wakeup_enable(hcd->self.controller); 233 return retval; 234 } 235 236 /* Error handling */ 237 at91_stop_hc(pdev); 238 239 err: 240 usb_put_hcd(hcd); 241 return retval; 242 } 243 244 245 /* may be called with controller, bus, and devices active */ 246 247 /** 248 * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs 249 * @dev: USB Host Controller being removed 250 * Context: !in_interrupt() 251 * 252 * Reverses the effect of usb_hcd_at91_probe(), first invoking 253 * the HCD's stop() method. It is always called from a thread 254 * context, "rmmod" or something similar. 255 * 256 */ 257 static void usb_hcd_at91_remove(struct usb_hcd *hcd, 258 struct platform_device *pdev) 259 { 260 usb_remove_hcd(hcd); 261 at91_stop_hc(pdev); 262 usb_put_hcd(hcd); 263 } 264 265 /*-------------------------------------------------------------------------*/ 266 static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable) 267 { 268 if (!valid_port(port)) 269 return; 270 271 if (!gpio_is_valid(pdata->vbus_pin[port])) 272 return; 273 274 gpio_set_value(pdata->vbus_pin[port], 275 pdata->vbus_pin_active_low[port] ^ enable); 276 } 277 278 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port) 279 { 280 if (!valid_port(port)) 281 return -EINVAL; 282 283 if (!gpio_is_valid(pdata->vbus_pin[port])) 284 return -EINVAL; 285 286 return gpio_get_value(pdata->vbus_pin[port]) ^ 287 pdata->vbus_pin_active_low[port]; 288 } 289 290 /* 291 * Update the status data from the hub with the over-current indicator change. 292 */ 293 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf) 294 { 295 struct at91_usbh_data *pdata = hcd->self.controller->platform_data; 296 int length = ohci_hub_status_data(hcd, buf); 297 int port; 298 299 at91_for_each_port(port) { 300 if (pdata->overcurrent_changed[port]) { 301 if (!length) 302 length = 1; 303 buf[0] |= 1 << (port + 1); 304 } 305 } 306 307 return length; 308 } 309 310 static int ohci_at91_port_suspend(struct regmap *regmap, u8 set) 311 { 312 u32 regval; 313 int ret; 314 315 if (!regmap) 316 return 0; 317 318 ret = regmap_read(regmap, AT91_SFR_OHCIICR, ®val); 319 if (ret) 320 return ret; 321 322 if (set) 323 regval |= AT91_OHCIICR_USB_SUSPEND; 324 else 325 regval &= ~AT91_OHCIICR_USB_SUSPEND; 326 327 regmap_write(regmap, AT91_SFR_OHCIICR, regval); 328 329 return 0; 330 } 331 332 /* 333 * Look at the control requests to the root hub and see if we need to override. 334 */ 335 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, 336 u16 wIndex, char *buf, u16 wLength) 337 { 338 struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller); 339 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); 340 struct usb_hub_descriptor *desc; 341 int ret = -EINVAL; 342 u32 *data = (u32 *)buf; 343 344 dev_dbg(hcd->self.controller, 345 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n", 346 hcd, typeReq, wValue, wIndex, buf, wLength); 347 348 wIndex--; 349 350 switch (typeReq) { 351 case SetPortFeature: 352 switch (wValue) { 353 case USB_PORT_FEAT_POWER: 354 dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n"); 355 if (valid_port(wIndex)) { 356 ohci_at91_usb_set_power(pdata, wIndex, 1); 357 ret = 0; 358 } 359 360 goto out; 361 362 case USB_PORT_FEAT_SUSPEND: 363 dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n"); 364 if (valid_port(wIndex)) { 365 ohci_at91_port_suspend(ohci_at91->sfr_regmap, 366 1); 367 return 0; 368 } 369 break; 370 } 371 break; 372 373 case ClearPortFeature: 374 switch (wValue) { 375 case USB_PORT_FEAT_C_OVER_CURRENT: 376 dev_dbg(hcd->self.controller, 377 "ClearPortFeature: C_OVER_CURRENT\n"); 378 379 if (valid_port(wIndex)) { 380 pdata->overcurrent_changed[wIndex] = 0; 381 pdata->overcurrent_status[wIndex] = 0; 382 } 383 384 goto out; 385 386 case USB_PORT_FEAT_OVER_CURRENT: 387 dev_dbg(hcd->self.controller, 388 "ClearPortFeature: OVER_CURRENT\n"); 389 390 if (valid_port(wIndex)) 391 pdata->overcurrent_status[wIndex] = 0; 392 393 goto out; 394 395 case USB_PORT_FEAT_POWER: 396 dev_dbg(hcd->self.controller, 397 "ClearPortFeature: POWER\n"); 398 399 if (valid_port(wIndex)) { 400 ohci_at91_usb_set_power(pdata, wIndex, 0); 401 return 0; 402 } 403 break; 404 405 case USB_PORT_FEAT_SUSPEND: 406 dev_dbg(hcd->self.controller, "ClearPortFeature: SUSPEND\n"); 407 if (valid_port(wIndex)) { 408 ohci_at91_port_suspend(ohci_at91->sfr_regmap, 409 0); 410 return 0; 411 } 412 break; 413 } 414 break; 415 } 416 417 ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength); 418 if (ret) 419 goto out; 420 421 switch (typeReq) { 422 case GetHubDescriptor: 423 424 /* update the hub's descriptor */ 425 426 desc = (struct usb_hub_descriptor *)buf; 427 428 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n", 429 desc->wHubCharacteristics); 430 431 /* remove the old configurations for power-switching, and 432 * over-current protection, and insert our new configuration 433 */ 434 435 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM); 436 desc->wHubCharacteristics |= 437 cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM); 438 439 if (pdata->overcurrent_supported) { 440 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM); 441 desc->wHubCharacteristics |= 442 cpu_to_le16(HUB_CHAR_INDV_PORT_OCPM); 443 } 444 445 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n", 446 desc->wHubCharacteristics); 447 448 return ret; 449 450 case GetPortStatus: 451 /* check port status */ 452 453 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex); 454 455 if (valid_port(wIndex)) { 456 if (!ohci_at91_usb_get_power(pdata, wIndex)) 457 *data &= ~cpu_to_le32(RH_PS_PPS); 458 459 if (pdata->overcurrent_changed[wIndex]) 460 *data |= cpu_to_le32(RH_PS_OCIC); 461 462 if (pdata->overcurrent_status[wIndex]) 463 *data |= cpu_to_le32(RH_PS_POCI); 464 } 465 } 466 467 out: 468 return ret; 469 } 470 471 /*-------------------------------------------------------------------------*/ 472 473 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data) 474 { 475 struct platform_device *pdev = data; 476 struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev); 477 int val, gpio, port; 478 479 /* From the GPIO notifying the over-current situation, find 480 * out the corresponding port */ 481 at91_for_each_port(port) { 482 if (gpio_is_valid(pdata->overcurrent_pin[port]) && 483 gpio_to_irq(pdata->overcurrent_pin[port]) == irq) { 484 gpio = pdata->overcurrent_pin[port]; 485 break; 486 } 487 } 488 489 if (port == AT91_MAX_USBH_PORTS) { 490 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n"); 491 return IRQ_HANDLED; 492 } 493 494 val = gpio_get_value(gpio); 495 496 /* When notified of an over-current situation, disable power 497 on the corresponding port, and mark this port in 498 over-current. */ 499 if (!val) { 500 ohci_at91_usb_set_power(pdata, port, 0); 501 pdata->overcurrent_status[port] = 1; 502 pdata->overcurrent_changed[port] = 1; 503 } 504 505 dev_dbg(& pdev->dev, "overcurrent situation %s\n", 506 val ? "exited" : "notified"); 507 508 return IRQ_HANDLED; 509 } 510 511 static const struct of_device_id at91_ohci_dt_ids[] = { 512 { .compatible = "atmel,at91rm9200-ohci" }, 513 { /* sentinel */ } 514 }; 515 516 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids); 517 518 /*-------------------------------------------------------------------------*/ 519 520 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev) 521 { 522 struct device_node *np = pdev->dev.of_node; 523 struct at91_usbh_data *pdata; 524 int i; 525 int gpio; 526 int ret; 527 enum of_gpio_flags flags; 528 u32 ports; 529 530 /* Right now device-tree probed devices don't get dma_mask set. 531 * Since shared usb code relies on it, set it here for now. 532 * Once we have dma capability bindings this can go away. 533 */ 534 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 535 if (ret) 536 return ret; 537 538 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 539 if (!pdata) 540 return -ENOMEM; 541 542 pdev->dev.platform_data = pdata; 543 544 if (!of_property_read_u32(np, "num-ports", &ports)) 545 pdata->ports = ports; 546 547 at91_for_each_port(i) { 548 /* 549 * do not configure PIO if not in relation with 550 * real USB port on board 551 */ 552 if (i >= pdata->ports) { 553 pdata->vbus_pin[i] = -EINVAL; 554 pdata->overcurrent_pin[i] = -EINVAL; 555 continue; 556 } 557 558 gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, 559 &flags); 560 pdata->vbus_pin[i] = gpio; 561 if (!gpio_is_valid(gpio)) 562 continue; 563 pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW; 564 565 ret = gpio_request(gpio, "ohci_vbus"); 566 if (ret) { 567 dev_err(&pdev->dev, 568 "can't request vbus gpio %d\n", gpio); 569 continue; 570 } 571 ret = gpio_direction_output(gpio, 572 !pdata->vbus_pin_active_low[i]); 573 if (ret) { 574 dev_err(&pdev->dev, 575 "can't put vbus gpio %d as output %d\n", 576 gpio, !pdata->vbus_pin_active_low[i]); 577 gpio_free(gpio); 578 continue; 579 } 580 581 ohci_at91_usb_set_power(pdata, i, 1); 582 } 583 584 at91_for_each_port(i) { 585 if (i >= pdata->ports) 586 break; 587 588 pdata->overcurrent_pin[i] = 589 of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags); 590 591 if (!gpio_is_valid(pdata->overcurrent_pin[i])) 592 continue; 593 gpio = pdata->overcurrent_pin[i]; 594 595 ret = gpio_request(gpio, "ohci_overcurrent"); 596 if (ret) { 597 dev_err(&pdev->dev, 598 "can't request overcurrent gpio %d\n", 599 gpio); 600 continue; 601 } 602 603 ret = gpio_direction_input(gpio); 604 if (ret) { 605 dev_err(&pdev->dev, 606 "can't configure overcurrent gpio %d as input\n", 607 gpio); 608 gpio_free(gpio); 609 continue; 610 } 611 612 ret = request_irq(gpio_to_irq(gpio), 613 ohci_hcd_at91_overcurrent_irq, 614 IRQF_SHARED, "ohci_overcurrent", pdev); 615 if (ret) { 616 gpio_free(gpio); 617 dev_err(&pdev->dev, 618 "can't get gpio IRQ for overcurrent\n"); 619 } 620 } 621 622 device_init_wakeup(&pdev->dev, 1); 623 return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev); 624 } 625 626 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev) 627 { 628 struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev); 629 int i; 630 631 if (pdata) { 632 at91_for_each_port(i) { 633 if (!gpio_is_valid(pdata->vbus_pin[i])) 634 continue; 635 ohci_at91_usb_set_power(pdata, i, 0); 636 gpio_free(pdata->vbus_pin[i]); 637 } 638 639 at91_for_each_port(i) { 640 if (!gpio_is_valid(pdata->overcurrent_pin[i])) 641 continue; 642 free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev); 643 gpio_free(pdata->overcurrent_pin[i]); 644 } 645 } 646 647 device_init_wakeup(&pdev->dev, 0); 648 usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev); 649 return 0; 650 } 651 652 static int __maybe_unused 653 ohci_hcd_at91_drv_suspend(struct device *dev) 654 { 655 struct usb_hcd *hcd = dev_get_drvdata(dev); 656 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 657 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); 658 int ret; 659 660 /* 661 * Disable wakeup if we are going to sleep with slow clock mode 662 * enabled. 663 */ 664 ohci_at91->wakeup = device_may_wakeup(dev) 665 && !at91_suspend_entering_slow_clock(); 666 667 if (ohci_at91->wakeup) 668 enable_irq_wake(hcd->irq); 669 670 ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1); 671 672 ret = ohci_suspend(hcd, ohci_at91->wakeup); 673 if (ret) { 674 if (ohci_at91->wakeup) 675 disable_irq_wake(hcd->irq); 676 return ret; 677 } 678 /* 679 * The integrated transceivers seem unable to notice disconnect, 680 * reconnect, or wakeup without the 48 MHz clock active. so for 681 * correctness, always discard connection state (using reset). 682 * 683 * REVISIT: some boards will be able to turn VBUS off... 684 */ 685 if (!ohci_at91->wakeup) { 686 ohci->rh_state = OHCI_RH_HALTED; 687 688 /* flush the writes */ 689 (void) ohci_readl (ohci, &ohci->regs->control); 690 at91_stop_clock(ohci_at91); 691 } 692 693 return ret; 694 } 695 696 static int __maybe_unused 697 ohci_hcd_at91_drv_resume(struct device *dev) 698 { 699 struct usb_hcd *hcd = dev_get_drvdata(dev); 700 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); 701 702 if (ohci_at91->wakeup) 703 disable_irq_wake(hcd->irq); 704 705 at91_start_clock(ohci_at91); 706 707 ohci_resume(hcd, false); 708 709 ohci_at91_port_suspend(ohci_at91->sfr_regmap, 0); 710 711 return 0; 712 } 713 714 static SIMPLE_DEV_PM_OPS(ohci_hcd_at91_pm_ops, ohci_hcd_at91_drv_suspend, 715 ohci_hcd_at91_drv_resume); 716 717 static struct platform_driver ohci_hcd_at91_driver = { 718 .probe = ohci_hcd_at91_drv_probe, 719 .remove = ohci_hcd_at91_drv_remove, 720 .shutdown = usb_hcd_platform_shutdown, 721 .driver = { 722 .name = "at91_ohci", 723 .pm = &ohci_hcd_at91_pm_ops, 724 .of_match_table = at91_ohci_dt_ids, 725 }, 726 }; 727 728 static int __init ohci_at91_init(void) 729 { 730 if (usb_disabled()) 731 return -ENODEV; 732 733 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 734 ohci_init_driver(&ohci_at91_hc_driver, &ohci_at91_drv_overrides); 735 736 /* 737 * The Atmel HW has some unusual quirks, which require Atmel-specific 738 * workarounds. We override certain hc_driver functions here to 739 * achieve that. We explicitly do not enhance ohci_driver_overrides to 740 * allow this more easily, since this is an unusual case, and we don't 741 * want to encourage others to override these functions by making it 742 * too easy. 743 */ 744 745 ohci_at91_hc_driver.hub_status_data = ohci_at91_hub_status_data; 746 ohci_at91_hc_driver.hub_control = ohci_at91_hub_control; 747 748 return platform_driver_register(&ohci_hcd_at91_driver); 749 } 750 module_init(ohci_at91_init); 751 752 static void __exit ohci_at91_cleanup(void) 753 { 754 platform_driver_unregister(&ohci_hcd_at91_driver); 755 } 756 module_exit(ohci_at91_cleanup); 757 758 MODULE_DESCRIPTION(DRIVER_DESC); 759 MODULE_LICENSE("GPL"); 760 MODULE_ALIAS("platform:at91_ohci"); 761