drivers/usb/host/ohci-at91.c

   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/usb.h>
  25 #include <linux/usb/hcd.h>
  26
  27 #include <mach/hardware.h>
  28 #include <asm/gpio.h>
  29
  30 #include <mach/cpu.h>
  31
  32
  33 #include "ohci.h"
  34
  35 #define valid_port(index)       ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
  36 #define at91_for_each_port(index)       \
  37                 for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
  38
  39 /* interface, function and usb clocks; sometimes also an AHB clock */
  40 static struct clk *iclk, *fclk, *uclk, *hclk;
  41 /* interface and function clocks; sometimes also an AHB clock */
  42
  43 #define DRIVER_DESC "OHCI Atmel driver"
  44
  45 static const char hcd_name[] = "ohci-atmel";
  46
  47 static struct hc_driver __read_mostly ohci_at91_hc_driver;
  48 static int clocked;
  49
  50 extern int usb_disabled(void);
  51
  52 /*-------------------------------------------------------------------------*/
  53
  54 static void at91_start_clock(void)
  55 {
  56         if (IS_ENABLED(CONFIG_COMMON_CLK)) {
  57                 clk_set_rate(uclk, 48000000);
  58                 clk_prepare_enable(uclk);
  59         }
  60         clk_prepare_enable(hclk);
  61         clk_prepare_enable(iclk);
  62         clk_prepare_enable(fclk);
  63         clocked = 1;
  64 }
  65
  66 static void at91_stop_clock(void)
  67 {
  68         clk_disable_unprepare(fclk);
  69         clk_disable_unprepare(iclk);
  70         clk_disable_unprepare(hclk);
  71         if (IS_ENABLED(CONFIG_COMMON_CLK))
  72                 clk_disable_unprepare(uclk);
  73         clocked = 0;
  74 }
  75
  76 static void at91_start_hc(struct platform_device *pdev)
  77 {
  78         struct usb_hcd *hcd = platform_get_drvdata(pdev);
  79         struct ohci_regs __iomem *regs = hcd->regs;
  80
  81         dev_dbg(&pdev->dev, "start\n");
  82
  83         /*
  84          * Start the USB clocks.
  85          */
  86         at91_start_clock();
  87
  88         /*
  89          * The USB host controller must remain in reset.
  90          */
  91         writel(0, &regs->control);
  92 }
  93
  94 static void at91_stop_hc(struct platform_device *pdev)
  95 {
  96         struct usb_hcd *hcd = platform_get_drvdata(pdev);
  97         struct ohci_regs __iomem *regs = hcd->regs;
  98
  99         dev_dbg(&pdev->dev, "stop\n");
 100
 101         /*
 102          * Put the USB host controller into reset.
 103          */
 104         writel(0, &regs->control);
 105
 106         /*
 107          * Stop the USB clocks.
 108          */
 109         at91_stop_clock();
 110 }
 111
 112
 113 /*-------------------------------------------------------------------------*/
 114
 115 static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
 116
 117 /* configure so an HC device and id are always provided */
 118 /* always called with process context; sleeping is OK */
 119
 120
 121 /**
 122  * usb_hcd_at91_probe - initialize AT91-based HCDs
 123  * Context: !in_interrupt()
 124  *
 125  * Allocates basic resources for this USB host controller, and
 126  * then invokes the start() method for the HCD associated with it
 127  * through the hotplug entry's driver_data.
 128  */
 129 static int usb_hcd_at91_probe(const struct hc_driver *driver,
 130                         struct platform_device *pdev)
 131 {
 132         struct at91_usbh_data *board;
 133         struct ohci_hcd *ohci;
 134         int retval;
 135         struct usb_hcd *hcd = NULL;
 136         struct device *dev = &pdev->dev;
 137         struct resource *res;
 138         int irq;
 139
 140         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 141         if (!res) {
 142                 dev_dbg(dev, "hcd probe: missing memory resource\n");
 143                 return -ENXIO;
 144         }
 145
 146         irq = platform_get_irq(pdev, 0);
 147         if (irq < 0) {
 148                 dev_dbg(dev, "hcd probe: missing irq resource\n");
 149                 return irq;
 150         }
 151
 152         hcd = usb_create_hcd(driver, dev, "at91");
 153         if (!hcd)
 154                 return -ENOMEM;
 155         hcd->rsrc_start = res->start;
 156         hcd->rsrc_len = resource_size(res);
 157
 158         hcd->regs = devm_ioremap_resource(dev, res);
 159         if (IS_ERR(hcd->regs)) {
 160                 retval = PTR_ERR(hcd->regs);
 161                 goto err;
 162         }
 163
 164         iclk = devm_clk_get(dev, "ohci_clk");
 165         if (IS_ERR(iclk)) {
 166                 dev_err(dev, "failed to get ohci_clk\n");
 167                 retval = PTR_ERR(iclk);
 168                 goto err;
 169         }
 170         fclk = devm_clk_get(dev, "uhpck");
 171         if (IS_ERR(fclk)) {
 172                 dev_err(dev, "failed to get uhpck\n");
 173                 retval = PTR_ERR(fclk);
 174                 goto err;
 175         }
 176         hclk = devm_clk_get(dev, "hclk");
 177         if (IS_ERR(hclk)) {
 178                 dev_err(dev, "failed to get hclk\n");
 179                 retval = PTR_ERR(hclk);
 180                 goto err;
 181         }
 182         if (IS_ENABLED(CONFIG_COMMON_CLK)) {
 183                 uclk = devm_clk_get(dev, "usb_clk");
 184                 if (IS_ERR(uclk)) {
 185                         dev_err(dev, "failed to get uclk\n");
 186                         retval = PTR_ERR(uclk);
 187                         goto err;
 188                 }
 189         }
 190
 191         board = hcd->self.controller->platform_data;
 192         ohci = hcd_to_ohci(hcd);
 193         ohci->num_ports = board->ports;
 194         at91_start_hc(pdev);
 195
 196         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 197         if (retval == 0) {
 198                 device_wakeup_enable(hcd->self.controller);
 199                 return retval;
 200         }
 201
 202         /* Error handling */
 203         at91_stop_hc(pdev);
 204
 205  err:
 206         usb_put_hcd(hcd);
 207         return retval;
 208 }
 209
 210
 211 /* may be called with controller, bus, and devices active */
 212
 213 /**
 214  * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
 215  * @dev: USB Host Controller being removed
 216  * Context: !in_interrupt()
 217  *
 218  * Reverses the effect of usb_hcd_at91_probe(), first invoking
 219  * the HCD's stop() method.  It is always called from a thread
 220  * context, "rmmod" or something similar.
 221  *
 222  */
 223 static void usb_hcd_at91_remove(struct usb_hcd *hcd,
 224                                 struct platform_device *pdev)
 225 {
 226         usb_remove_hcd(hcd);
 227         at91_stop_hc(pdev);
 228         usb_put_hcd(hcd);
 229 }
 230
 231 /*-------------------------------------------------------------------------*/
 232 static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
 233 {
 234         if (!valid_port(port))
 235                 return;
 236
 237         if (!gpio_is_valid(pdata->vbus_pin[port]))
 238                 return;
 239
 240         gpio_set_value(pdata->vbus_pin[port],
 241                        pdata->vbus_pin_active_low[port] ^ enable);
 242 }
 243
 244 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
 245 {
 246         if (!valid_port(port))
 247                 return -EINVAL;
 248
 249         if (!gpio_is_valid(pdata->vbus_pin[port]))
 250                 return -EINVAL;
 251
 252         return gpio_get_value(pdata->vbus_pin[port]) ^
 253                 pdata->vbus_pin_active_low[port];
 254 }
 255
 256 /*
 257  * Update the status data from the hub with the over-current indicator change.
 258  */
 259 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
 260 {
 261         struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
 262         int length = ohci_hub_status_data(hcd, buf);
 263         int port;
 264
 265         at91_for_each_port(port) {
 266                 if (pdata->overcurrent_changed[port]) {
 267                         if (!length)
 268                                 length = 1;
 269                         buf[0] |= 1 << (port + 1);
 270                 }
 271         }
 272
 273         return length;
 274 }
 275
 276 /*
 277  * Look at the control requests to the root hub and see if we need to override.
 278  */
 279 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 280                                  u16 wIndex, char *buf, u16 wLength)
 281 {
 282         struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
 283         struct usb_hub_descriptor *desc;
 284         int ret = -EINVAL;
 285         u32 *data = (u32 *)buf;
 286
 287         dev_dbg(hcd->self.controller,
 288                 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
 289                 hcd, typeReq, wValue, wIndex, buf, wLength);
 290
 291         wIndex--;
 292
 293         switch (typeReq) {
 294         case SetPortFeature:
 295                 if (wValue == USB_PORT_FEAT_POWER) {
 296                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
 297                         if (valid_port(wIndex)) {
 298                                 ohci_at91_usb_set_power(pdata, wIndex, 1);
 299                                 ret = 0;
 300                         }
 301
 302                         goto out;
 303                 }
 304                 break;
 305
 306         case ClearPortFeature:
 307                 switch (wValue) {
 308                 case USB_PORT_FEAT_C_OVER_CURRENT:
 309                         dev_dbg(hcd->self.controller,
 310                                 "ClearPortFeature: C_OVER_CURRENT\n");
 311
 312                         if (valid_port(wIndex)) {
 313                                 pdata->overcurrent_changed[wIndex] = 0;
 314                                 pdata->overcurrent_status[wIndex] = 0;
 315                         }
 316
 317                         goto out;
 318
 319                 case USB_PORT_FEAT_OVER_CURRENT:
 320                         dev_dbg(hcd->self.controller,
 321                                 "ClearPortFeature: OVER_CURRENT\n");
 322
 323                         if (valid_port(wIndex))
 324                                 pdata->overcurrent_status[wIndex] = 0;
 325
 326                         goto out;
 327
 328                 case USB_PORT_FEAT_POWER:
 329                         dev_dbg(hcd->self.controller,
 330                                 "ClearPortFeature: POWER\n");
 331
 332                         if (valid_port(wIndex)) {
 333                                 ohci_at91_usb_set_power(pdata, wIndex, 0);
 334                                 return 0;
 335                         }
 336                 }
 337                 break;
 338         }
 339
 340         ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
 341         if (ret)
 342                 goto out;
 343
 344         switch (typeReq) {
 345         case GetHubDescriptor:
 346
 347                 /* update the hub's descriptor */
 348
 349                 desc = (struct usb_hub_descriptor *)buf;
 350
 351                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
 352                         desc->wHubCharacteristics);
 353
 354                 /* remove the old configurations for power-switching, and
 355                  * over-current protection, and insert our new configuration
 356                  */
 357
 358                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
 359                 desc->wHubCharacteristics |= cpu_to_le16(0x0001);
 360
 361                 if (pdata->overcurrent_supported) {
 362                         desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
 363                         desc->wHubCharacteristics |=  cpu_to_le16(0x0008|0x0001);
 364                 }
 365
 366                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
 367                         desc->wHubCharacteristics);
 368
 369                 return ret;
 370
 371         case GetPortStatus:
 372                 /* check port status */
 373
 374                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
 375
 376                 if (valid_port(wIndex)) {
 377                         if (!ohci_at91_usb_get_power(pdata, wIndex))
 378                                 *data &= ~cpu_to_le32(RH_PS_PPS);
 379
 380                         if (pdata->overcurrent_changed[wIndex])
 381                                 *data |= cpu_to_le32(RH_PS_OCIC);
 382
 383                         if (pdata->overcurrent_status[wIndex])
 384                                 *data |= cpu_to_le32(RH_PS_POCI);
 385                 }
 386         }
 387
 388  out:
 389         return ret;
 390 }
 391
 392 /*-------------------------------------------------------------------------*/
 393
 394 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
 395 {
 396         struct platform_device *pdev = data;
 397         struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
 398         int val, gpio, port;
 399
 400         /* From the GPIO notifying the over-current situation, find
 401          * out the corresponding port */
 402         at91_for_each_port(port) {
 403                 if (gpio_is_valid(pdata->overcurrent_pin[port]) &&
 404                                 gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
 405                         gpio = pdata->overcurrent_pin[port];
 406                         break;
 407                 }
 408         }
 409
 410         if (port == AT91_MAX_USBH_PORTS) {
 411                 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
 412                 return IRQ_HANDLED;
 413         }
 414
 415         val = gpio_get_value(gpio);
 416
 417         /* When notified of an over-current situation, disable power
 418            on the corresponding port, and mark this port in
 419            over-current. */
 420         if (!val) {
 421                 ohci_at91_usb_set_power(pdata, port, 0);
 422                 pdata->overcurrent_status[port]  = 1;
 423                 pdata->overcurrent_changed[port] = 1;
 424         }
 425
 426         dev_dbg(& pdev->dev, "overcurrent situation %s\n",
 427                 val ? "exited" : "notified");
 428
 429         return IRQ_HANDLED;
 430 }
 431
 432 #ifdef CONFIG_OF
 433 static const struct of_device_id at91_ohci_dt_ids[] = {
 434         { .compatible = "atmel,at91rm9200-ohci" },
 435         { /* sentinel */ }
 436 };
 437
 438 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
 439
 440 static int ohci_at91_of_init(struct platform_device *pdev)
 441 {
 442         struct device_node *np = pdev->dev.of_node;
 443         int i, gpio, ret;
 444         enum of_gpio_flags flags;
 445         struct at91_usbh_data   *pdata;
 446         u32 ports;
 447
 448         if (!np)
 449                 return 0;
 450
 451         /* Right now device-tree probed devices don't get dma_mask set.
 452          * Since shared usb code relies on it, set it here for now.
 453          * Once we have dma capability bindings this can go away.
 454          */
 455         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 456         if (ret)
 457                 return ret;
 458
 459         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 460         if (!pdata)
 461                 return -ENOMEM;
 462
 463         if (!of_property_read_u32(np, "num-ports", &ports))
 464                 pdata->ports = ports;
 465
 466         at91_for_each_port(i) {
 467                 gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
 468                 pdata->vbus_pin[i] = gpio;
 469                 if (!gpio_is_valid(gpio))
 470                         continue;
 471                 pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
 472         }
 473
 474         at91_for_each_port(i)
 475                 pdata->overcurrent_pin[i] =
 476                         of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
 477
 478         pdev->dev.platform_data = pdata;
 479
 480         return 0;
 481 }
 482 #else
 483 static int ohci_at91_of_init(struct platform_device *pdev)
 484 {
 485         return 0;
 486 }
 487 #endif
 488
 489 /*-------------------------------------------------------------------------*/
 490
 491 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
 492 {
 493         struct at91_usbh_data   *pdata;
 494         int                     i;
 495         int                     gpio;
 496         int                     ret;
 497
 498         ret = ohci_at91_of_init(pdev);
 499         if (ret)
 500                 return ret;
 501
 502         pdata = dev_get_platdata(&pdev->dev);
 503
 504         if (pdata) {
 505                 at91_for_each_port(i) {
 506                         /*
 507                          * do not configure PIO if not in relation with
 508                          * real USB port on board
 509                          */
 510                         if (i >= pdata->ports) {
 511                                 pdata->vbus_pin[i] = -EINVAL;
 512                                 pdata->overcurrent_pin[i] = -EINVAL;
 513                                 break;
 514                         }
 515
 516                         if (!gpio_is_valid(pdata->vbus_pin[i]))
 517                                 continue;
 518                         gpio = pdata->vbus_pin[i];
 519
 520                         ret = gpio_request(gpio, "ohci_vbus");
 521                         if (ret) {
 522                                 dev_err(&pdev->dev,
 523                                         "can't request vbus gpio %d\n", gpio);
 524                                 continue;
 525                         }
 526                         ret = gpio_direction_output(gpio,
 527                                                 !pdata->vbus_pin_active_low[i]);
 528                         if (ret) {
 529                                 dev_err(&pdev->dev,
 530                                         "can't put vbus gpio %d as output %d\n",
 531                                         gpio, !pdata->vbus_pin_active_low[i]);
 532                                 gpio_free(gpio);
 533                                 continue;
 534                         }
 535
 536                         ohci_at91_usb_set_power(pdata, i, 1);
 537                 }
 538
 539                 at91_for_each_port(i) {
 540                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
 541                                 continue;
 542                         gpio = pdata->overcurrent_pin[i];
 543
 544                         ret = gpio_request(gpio, "ohci_overcurrent");
 545                         if (ret) {
 546                                 dev_err(&pdev->dev,
 547                                         "can't request overcurrent gpio %d\n",
 548                                         gpio);
 549                                 continue;
 550                         }
 551
 552                         ret = gpio_direction_input(gpio);
 553                         if (ret) {
 554                                 dev_err(&pdev->dev,
 555                                         "can't configure overcurrent gpio %d as input\n",
 556                                         gpio);
 557                                 gpio_free(gpio);
 558                                 continue;
 559                         }
 560
 561                         ret = request_irq(gpio_to_irq(gpio),
 562                                           ohci_hcd_at91_overcurrent_irq,
 563                                           IRQF_SHARED, "ohci_overcurrent", pdev);
 564                         if (ret) {
 565                                 gpio_free(gpio);
 566                                 dev_err(&pdev->dev,
 567                                         "can't get gpio IRQ for overcurrent\n");
 568                         }
 569                 }
 570         }
 571
 572         device_init_wakeup(&pdev->dev, 1);
 573         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 574 }
 575
 576 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
 577 {
 578         struct at91_usbh_data   *pdata = dev_get_platdata(&pdev->dev);
 579         int                     i;
 580
 581         if (pdata) {
 582                 at91_for_each_port(i) {
 583                         if (!gpio_is_valid(pdata->vbus_pin[i]))
 584                                 continue;
 585                         ohci_at91_usb_set_power(pdata, i, 0);
 586                         gpio_free(pdata->vbus_pin[i]);
 587                 }
 588
 589                 at91_for_each_port(i) {
 590                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
 591                                 continue;
 592                         free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
 593                         gpio_free(pdata->overcurrent_pin[i]);
 594                 }
 595         }
 596
 597         device_init_wakeup(&pdev->dev, 0);
 598         usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
 599         return 0;
 600 }
 601
 602 #ifdef CONFIG_PM
 603
 604 static int
 605 ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
 606 {
 607         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 608         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 609         bool            do_wakeup = device_may_wakeup(&pdev->dev);
 610         int             ret;
 611
 612         if (do_wakeup)
 613                 enable_irq_wake(hcd->irq);
 614
 615         ret = ohci_suspend(hcd, do_wakeup);
 616         if (ret) {
 617                 disable_irq_wake(hcd->irq);
 618                 return ret;
 619         }
 620         /*
 621          * The integrated transceivers seem unable to notice disconnect,
 622          * reconnect, or wakeup without the 48 MHz clock active.  so for
 623          * correctness, always discard connection state (using reset).
 624          *
 625          * REVISIT: some boards will be able to turn VBUS off...
 626          */
 627         if (at91_suspend_entering_slow_clock()) {
 628                 ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
 629                 ohci->hc_control &= OHCI_CTRL_RWC;
 630                 ohci_writel(ohci, ohci->hc_control, &ohci->regs->control);
 631                 ohci->rh_state = OHCI_RH_HALTED;
 632
 633                 /* flush the writes */
 634                 (void) ohci_readl (ohci, &ohci->regs->control);
 635                 at91_stop_clock();
 636         }
 637
 638         return ret;
 639 }
 640
 641 static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
 642 {
 643         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 644
 645         if (device_may_wakeup(&pdev->dev))
 646                 disable_irq_wake(hcd->irq);
 647
 648         if (!clocked)
 649                 at91_start_clock();
 650
 651         ohci_resume(hcd, false);
 652         return 0;
 653 }
 654 #else
 655 #define ohci_hcd_at91_drv_suspend NULL
 656 #define ohci_hcd_at91_drv_resume  NULL
 657 #endif
 658
 659 static struct platform_driver ohci_hcd_at91_driver = {
 660         .probe          = ohci_hcd_at91_drv_probe,
 661         .remove         = ohci_hcd_at91_drv_remove,
 662         .shutdown       = usb_hcd_platform_shutdown,
 663         .suspend        = ohci_hcd_at91_drv_suspend,
 664         .resume         = ohci_hcd_at91_drv_resume,
 665         .driver         = {
 666                 .name   = "at91_ohci",
 667                 .owner  = THIS_MODULE,
 668                 .of_match_table = of_match_ptr(at91_ohci_dt_ids),
 669         },
 670 };
 671
 672 static int __init ohci_at91_init(void)
 673 {
 674         if (usb_disabled())
 675                 return -ENODEV;
 676
 677         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 678         ohci_init_driver(&ohci_at91_hc_driver, NULL);
 679
 680         /*
 681          * The Atmel HW has some unusual quirks, which require Atmel-specific
 682          * workarounds. We override certain hc_driver functions here to
 683          * achieve that. We explicitly do not enhance ohci_driver_overrides to
 684          * allow this more easily, since this is an unusual case, and we don't
 685          * want to encourage others to override these functions by making it
 686          * too easy.
 687          */
 688
 689         ohci_at91_hc_driver.hub_status_data     = ohci_at91_hub_status_data;
 690         ohci_at91_hc_driver.hub_control         = ohci_at91_hub_control;
 691
 692         return platform_driver_register(&ohci_hcd_at91_driver);
 693 }
 694 module_init(ohci_at91_init);
 695
 696 static void __exit ohci_at91_cleanup(void)
 697 {
 698         platform_driver_unregister(&ohci_hcd_at91_driver);
 699 }
 700 module_exit(ohci_at91_cleanup);
 701
 702 MODULE_DESCRIPTION(DRIVER_DESC);
 703 MODULE_LICENSE("GPL");
 704 MODULE_ALIAS("platform:at91_ohci");