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 retval = usb_add_hcd(hcd, irq, IRQF_SHARED); 225 if (retval == 0) { 226 device_wakeup_enable(hcd->self.controller); 227 return retval; 228 } 229 230 /* Error handling */ 231 at91_stop_hc(pdev); 232 233 err: 234 usb_put_hcd(hcd); 235 return retval; 236 } 237 238 239 /* may be called with controller, bus, and devices active */ 240 241 /** 242 * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs 243 * @dev: USB Host Controller being removed 244 * Context: !in_interrupt() 245 * 246 * Reverses the effect of usb_hcd_at91_probe(), first invoking 247 * the HCD's stop() method. It is always called from a thread 248 * context, "rmmod" or something similar. 249 * 250 */ 251 static void usb_hcd_at91_remove(struct usb_hcd *hcd, 252 struct platform_device *pdev) 253 { 254 usb_remove_hcd(hcd); 255 at91_stop_hc(pdev); 256 usb_put_hcd(hcd); 257 } 258 259 /*-------------------------------------------------------------------------*/ 260 static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable) 261 { 262 if (!valid_port(port)) 263 return; 264 265 if (!gpio_is_valid(pdata->vbus_pin[port])) 266 return; 267 268 gpio_set_value(pdata->vbus_pin[port], 269 pdata->vbus_pin_active_low[port] ^ enable); 270 } 271 272 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port) 273 { 274 if (!valid_port(port)) 275 return -EINVAL; 276 277 if (!gpio_is_valid(pdata->vbus_pin[port])) 278 return -EINVAL; 279 280 return gpio_get_value(pdata->vbus_pin[port]) ^ 281 pdata->vbus_pin_active_low[port]; 282 } 283 284 /* 285 * Update the status data from the hub with the over-current indicator change. 286 */ 287 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf) 288 { 289 struct at91_usbh_data *pdata = hcd->self.controller->platform_data; 290 int length = ohci_hub_status_data(hcd, buf); 291 int port; 292 293 at91_for_each_port(port) { 294 if (pdata->overcurrent_changed[port]) { 295 if (!length) 296 length = 1; 297 buf[0] |= 1 << (port + 1); 298 } 299 } 300 301 return length; 302 } 303 304 static int ohci_at91_port_suspend(struct regmap *regmap, u8 set) 305 { 306 u32 regval; 307 int ret; 308 309 if (!regmap) 310 return 0; 311 312 ret = regmap_read(regmap, AT91_SFR_OHCIICR, ®val); 313 if (ret) 314 return ret; 315 316 if (set) 317 regval |= AT91_OHCIICR_USB_SUSPEND; 318 else 319 regval &= ~AT91_OHCIICR_USB_SUSPEND; 320 321 regmap_write(regmap, AT91_SFR_OHCIICR, regval); 322 323 return 0; 324 } 325 326 /* 327 * Look at the control requests to the root hub and see if we need to override. 328 */ 329 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, 330 u16 wIndex, char *buf, u16 wLength) 331 { 332 struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller); 333 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); 334 struct usb_hub_descriptor *desc; 335 int ret = -EINVAL; 336 u32 *data = (u32 *)buf; 337 338 dev_dbg(hcd->self.controller, 339 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n", 340 hcd, typeReq, wValue, wIndex, buf, wLength); 341 342 wIndex--; 343 344 switch (typeReq) { 345 case SetPortFeature: 346 switch (wValue) { 347 case USB_PORT_FEAT_POWER: 348 dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n"); 349 if (valid_port(wIndex)) { 350 ohci_at91_usb_set_power(pdata, wIndex, 1); 351 ret = 0; 352 } 353 354 goto out; 355 356 case USB_PORT_FEAT_SUSPEND: 357 dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n"); 358 if (valid_port(wIndex)) { 359 ohci_at91_port_suspend(ohci_at91->sfr_regmap, 360 1); 361 return 0; 362 } 363 break; 364 } 365 break; 366 367 case ClearPortFeature: 368 switch (wValue) { 369 case USB_PORT_FEAT_C_OVER_CURRENT: 370 dev_dbg(hcd->self.controller, 371 "ClearPortFeature: C_OVER_CURRENT\n"); 372 373 if (valid_port(wIndex)) { 374 pdata->overcurrent_changed[wIndex] = 0; 375 pdata->overcurrent_status[wIndex] = 0; 376 } 377 378 goto out; 379 380 case USB_PORT_FEAT_OVER_CURRENT: 381 dev_dbg(hcd->self.controller, 382 "ClearPortFeature: OVER_CURRENT\n"); 383 384 if (valid_port(wIndex)) 385 pdata->overcurrent_status[wIndex] = 0; 386 387 goto out; 388 389 case USB_PORT_FEAT_POWER: 390 dev_dbg(hcd->self.controller, 391 "ClearPortFeature: POWER\n"); 392 393 if (valid_port(wIndex)) { 394 ohci_at91_usb_set_power(pdata, wIndex, 0); 395 return 0; 396 } 397 break; 398 399 case USB_PORT_FEAT_SUSPEND: 400 dev_dbg(hcd->self.controller, "ClearPortFeature: SUSPEND\n"); 401 if (valid_port(wIndex)) { 402 ohci_at91_port_suspend(ohci_at91->sfr_regmap, 403 0); 404 return 0; 405 } 406 break; 407 } 408 break; 409 } 410 411 ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength); 412 if (ret) 413 goto out; 414 415 switch (typeReq) { 416 case GetHubDescriptor: 417 418 /* update the hub's descriptor */ 419 420 desc = (struct usb_hub_descriptor *)buf; 421 422 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n", 423 desc->wHubCharacteristics); 424 425 /* remove the old configurations for power-switching, and 426 * over-current protection, and insert our new configuration 427 */ 428 429 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM); 430 desc->wHubCharacteristics |= 431 cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM); 432 433 if (pdata->overcurrent_supported) { 434 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM); 435 desc->wHubCharacteristics |= 436 cpu_to_le16(HUB_CHAR_INDV_PORT_OCPM); 437 } 438 439 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n", 440 desc->wHubCharacteristics); 441 442 return ret; 443 444 case GetPortStatus: 445 /* check port status */ 446 447 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex); 448 449 if (valid_port(wIndex)) { 450 if (!ohci_at91_usb_get_power(pdata, wIndex)) 451 *data &= ~cpu_to_le32(RH_PS_PPS); 452 453 if (pdata->overcurrent_changed[wIndex]) 454 *data |= cpu_to_le32(RH_PS_OCIC); 455 456 if (pdata->overcurrent_status[wIndex]) 457 *data |= cpu_to_le32(RH_PS_POCI); 458 } 459 } 460 461 out: 462 return ret; 463 } 464 465 /*-------------------------------------------------------------------------*/ 466 467 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data) 468 { 469 struct platform_device *pdev = data; 470 struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev); 471 int val, gpio, port; 472 473 /* From the GPIO notifying the over-current situation, find 474 * out the corresponding port */ 475 at91_for_each_port(port) { 476 if (gpio_is_valid(pdata->overcurrent_pin[port]) && 477 gpio_to_irq(pdata->overcurrent_pin[port]) == irq) { 478 gpio = pdata->overcurrent_pin[port]; 479 break; 480 } 481 } 482 483 if (port == AT91_MAX_USBH_PORTS) { 484 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n"); 485 return IRQ_HANDLED; 486 } 487 488 val = gpio_get_value(gpio); 489 490 /* When notified of an over-current situation, disable power 491 on the corresponding port, and mark this port in 492 over-current. */ 493 if (!val) { 494 ohci_at91_usb_set_power(pdata, port, 0); 495 pdata->overcurrent_status[port] = 1; 496 pdata->overcurrent_changed[port] = 1; 497 } 498 499 dev_dbg(& pdev->dev, "overcurrent situation %s\n", 500 val ? "exited" : "notified"); 501 502 return IRQ_HANDLED; 503 } 504 505 static const struct of_device_id at91_ohci_dt_ids[] = { 506 { .compatible = "atmel,at91rm9200-ohci" }, 507 { /* sentinel */ } 508 }; 509 510 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids); 511 512 /*-------------------------------------------------------------------------*/ 513 514 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev) 515 { 516 struct device_node *np = pdev->dev.of_node; 517 struct at91_usbh_data *pdata; 518 int i; 519 int gpio; 520 int ret; 521 enum of_gpio_flags flags; 522 u32 ports; 523 524 /* Right now device-tree probed devices don't get dma_mask set. 525 * Since shared usb code relies on it, set it here for now. 526 * Once we have dma capability bindings this can go away. 527 */ 528 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 529 if (ret) 530 return ret; 531 532 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 533 if (!pdata) 534 return -ENOMEM; 535 536 pdev->dev.platform_data = pdata; 537 538 if (!of_property_read_u32(np, "num-ports", &ports)) 539 pdata->ports = ports; 540 541 at91_for_each_port(i) { 542 /* 543 * do not configure PIO if not in relation with 544 * real USB port on board 545 */ 546 if (i >= pdata->ports) { 547 pdata->vbus_pin[i] = -EINVAL; 548 pdata->overcurrent_pin[i] = -EINVAL; 549 continue; 550 } 551 552 gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, 553 &flags); 554 pdata->vbus_pin[i] = gpio; 555 if (!gpio_is_valid(gpio)) 556 continue; 557 pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW; 558 559 ret = gpio_request(gpio, "ohci_vbus"); 560 if (ret) { 561 dev_err(&pdev->dev, 562 "can't request vbus gpio %d\n", gpio); 563 continue; 564 } 565 ret = gpio_direction_output(gpio, 566 !pdata->vbus_pin_active_low[i]); 567 if (ret) { 568 dev_err(&pdev->dev, 569 "can't put vbus gpio %d as output %d\n", 570 gpio, !pdata->vbus_pin_active_low[i]); 571 gpio_free(gpio); 572 continue; 573 } 574 575 ohci_at91_usb_set_power(pdata, i, 1); 576 } 577 578 at91_for_each_port(i) { 579 if (i >= pdata->ports) 580 break; 581 582 pdata->overcurrent_pin[i] = 583 of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags); 584 585 if (!gpio_is_valid(pdata->overcurrent_pin[i])) 586 continue; 587 gpio = pdata->overcurrent_pin[i]; 588 589 ret = gpio_request(gpio, "ohci_overcurrent"); 590 if (ret) { 591 dev_err(&pdev->dev, 592 "can't request overcurrent gpio %d\n", 593 gpio); 594 continue; 595 } 596 597 ret = gpio_direction_input(gpio); 598 if (ret) { 599 dev_err(&pdev->dev, 600 "can't configure overcurrent gpio %d as input\n", 601 gpio); 602 gpio_free(gpio); 603 continue; 604 } 605 606 ret = request_irq(gpio_to_irq(gpio), 607 ohci_hcd_at91_overcurrent_irq, 608 IRQF_SHARED, "ohci_overcurrent", pdev); 609 if (ret) { 610 gpio_free(gpio); 611 dev_err(&pdev->dev, 612 "can't get gpio IRQ for overcurrent\n"); 613 } 614 } 615 616 device_init_wakeup(&pdev->dev, 1); 617 return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev); 618 } 619 620 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev) 621 { 622 struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev); 623 int i; 624 625 if (pdata) { 626 at91_for_each_port(i) { 627 if (!gpio_is_valid(pdata->vbus_pin[i])) 628 continue; 629 ohci_at91_usb_set_power(pdata, i, 0); 630 gpio_free(pdata->vbus_pin[i]); 631 } 632 633 at91_for_each_port(i) { 634 if (!gpio_is_valid(pdata->overcurrent_pin[i])) 635 continue; 636 free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev); 637 gpio_free(pdata->overcurrent_pin[i]); 638 } 639 } 640 641 device_init_wakeup(&pdev->dev, 0); 642 usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev); 643 return 0; 644 } 645 646 static int __maybe_unused 647 ohci_hcd_at91_drv_suspend(struct device *dev) 648 { 649 struct usb_hcd *hcd = dev_get_drvdata(dev); 650 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 651 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); 652 int ret; 653 654 /* 655 * Disable wakeup if we are going to sleep with slow clock mode 656 * enabled. 657 */ 658 ohci_at91->wakeup = device_may_wakeup(dev) 659 && !at91_suspend_entering_slow_clock(); 660 661 if (ohci_at91->wakeup) 662 enable_irq_wake(hcd->irq); 663 664 ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1); 665 666 ret = ohci_suspend(hcd, ohci_at91->wakeup); 667 if (ret) { 668 if (ohci_at91->wakeup) 669 disable_irq_wake(hcd->irq); 670 return ret; 671 } 672 /* 673 * The integrated transceivers seem unable to notice disconnect, 674 * reconnect, or wakeup without the 48 MHz clock active. so for 675 * correctness, always discard connection state (using reset). 676 * 677 * REVISIT: some boards will be able to turn VBUS off... 678 */ 679 if (!ohci_at91->wakeup) { 680 ohci->hc_control = ohci_readl(ohci, &ohci->regs->control); 681 ohci->hc_control &= OHCI_CTRL_RWC; 682 ohci_writel(ohci, ohci->hc_control, &ohci->regs->control); 683 ohci->rh_state = OHCI_RH_HALTED; 684 685 /* flush the writes */ 686 (void) ohci_readl (ohci, &ohci->regs->control); 687 at91_stop_clock(ohci_at91); 688 } 689 690 return ret; 691 } 692 693 static int __maybe_unused 694 ohci_hcd_at91_drv_resume(struct device *dev) 695 { 696 struct usb_hcd *hcd = dev_get_drvdata(dev); 697 struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); 698 699 if (ohci_at91->wakeup) 700 disable_irq_wake(hcd->irq); 701 702 at91_start_clock(ohci_at91); 703 704 ohci_resume(hcd, false); 705 706 ohci_at91_port_suspend(ohci_at91->sfr_regmap, 0); 707 708 return 0; 709 } 710 711 static SIMPLE_DEV_PM_OPS(ohci_hcd_at91_pm_ops, ohci_hcd_at91_drv_suspend, 712 ohci_hcd_at91_drv_resume); 713 714 static struct platform_driver ohci_hcd_at91_driver = { 715 .probe = ohci_hcd_at91_drv_probe, 716 .remove = ohci_hcd_at91_drv_remove, 717 .shutdown = usb_hcd_platform_shutdown, 718 .driver = { 719 .name = "at91_ohci", 720 .pm = &ohci_hcd_at91_pm_ops, 721 .of_match_table = at91_ohci_dt_ids, 722 }, 723 }; 724 725 static int __init ohci_at91_init(void) 726 { 727 if (usb_disabled()) 728 return -ENODEV; 729 730 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 731 ohci_init_driver(&ohci_at91_hc_driver, &ohci_at91_drv_overrides); 732 733 /* 734 * The Atmel HW has some unusual quirks, which require Atmel-specific 735 * workarounds. We override certain hc_driver functions here to 736 * achieve that. We explicitly do not enhance ohci_driver_overrides to 737 * allow this more easily, since this is an unusual case, and we don't 738 * want to encourage others to override these functions by making it 739 * too easy. 740 */ 741 742 ohci_at91_hc_driver.hub_status_data = ohci_at91_hub_status_data; 743 ohci_at91_hc_driver.hub_control = ohci_at91_hub_control; 744 745 return platform_driver_register(&ohci_hcd_at91_driver); 746 } 747 module_init(ohci_at91_init); 748 749 static void __exit ohci_at91_cleanup(void) 750 { 751 platform_driver_unregister(&ohci_hcd_at91_driver); 752 } 753 module_exit(ohci_at91_cleanup); 754 755 MODULE_DESCRIPTION(DRIVER_DESC); 756 MODULE_LICENSE("GPL"); 757 MODULE_ALIAS("platform:at91_ohci"); 758