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 <[email protected]>
   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 <asm/gpio.h>
  28
  29 #include "ohci.h"
  30
  31 #define valid_port(index)       ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
  32 #define at91_for_each_port(index)       \
  33                 for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
  34
  35 /* interface, function and usb clocks; sometimes also an AHB clock */
  36 #define hcd_to_ohci_at91_priv(h) \
  37         ((struct ohci_at91_priv *)hcd_to_ohci(h)->priv)
  38
  39 struct ohci_at91_priv {
  40         struct clk *iclk;
  41         struct clk *fclk;
  42         struct clk *hclk;
  43         bool clocked;
  44         bool wakeup;            /* Saved wake-up state for resume */
  45 };
  46 /* interface and function clocks; sometimes also an AHB clock */
  47
  48 #define DRIVER_DESC "OHCI Atmel driver"
  49
  50 static const char hcd_name[] = "ohci-atmel";
  51
  52 static struct hc_driver __read_mostly ohci_at91_hc_driver;
  53
  54 static const struct ohci_driver_overrides ohci_at91_drv_overrides __initconst = {
  55         .extra_priv_size = sizeof(struct ohci_at91_priv),
  56 };
  57
  58 extern int usb_disabled(void);
  59
  60 /*-------------------------------------------------------------------------*/
  61
  62 static void at91_start_clock(struct ohci_at91_priv *ohci_at91)
  63 {
  64         if (ohci_at91->clocked)
  65                 return;
  66
  67         clk_set_rate(ohci_at91->fclk, 48000000);
  68         clk_prepare_enable(ohci_at91->hclk);
  69         clk_prepare_enable(ohci_at91->iclk);
  70         clk_prepare_enable(ohci_at91->fclk);
  71         ohci_at91->clocked = true;
  72 }
  73
  74 static void at91_stop_clock(struct ohci_at91_priv *ohci_at91)
  75 {
  76         if (!ohci_at91->clocked)
  77                 return;
  78
  79         clk_disable_unprepare(ohci_at91->fclk);
  80         clk_disable_unprepare(ohci_at91->iclk);
  81         clk_disable_unprepare(ohci_at91->hclk);
  82         ohci_at91->clocked = false;
  83 }
  84
  85 static void at91_start_hc(struct platform_device *pdev)
  86 {
  87         struct usb_hcd *hcd = platform_get_drvdata(pdev);
  88         struct ohci_regs __iomem *regs = hcd->regs;
  89         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
  90
  91         dev_dbg(&pdev->dev, "start\n");
  92
  93         /*
  94          * Start the USB clocks.
  95          */
  96         at91_start_clock(ohci_at91);
  97
  98         /*
  99          * The USB host controller must remain in reset.
 100          */
 101         writel(0, &regs->control);
 102 }
 103
 104 static void at91_stop_hc(struct platform_device *pdev)
 105 {
 106         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 107         struct ohci_regs __iomem *regs = hcd->regs;
 108         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
 109
 110         dev_dbg(&pdev->dev, "stop\n");
 111
 112         /*
 113          * Put the USB host controller into reset.
 114          */
 115         writel(0, &regs->control);
 116
 117         /*
 118          * Stop the USB clocks.
 119          */
 120         at91_stop_clock(ohci_at91);
 121 }
 122
 123
 124 /*-------------------------------------------------------------------------*/
 125
 126 static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
 127
 128 /* configure so an HC device and id are always provided */
 129 /* always called with process context; sleeping is OK */
 130
 131
 132 /**
 133  * usb_hcd_at91_probe - initialize AT91-based HCDs
 134  * Context: !in_interrupt()
 135  *
 136  * Allocates basic resources for this USB host controller, and
 137  * then invokes the start() method for the HCD associated with it
 138  * through the hotplug entry's driver_data.
 139  */
 140 static int usb_hcd_at91_probe(const struct hc_driver *driver,
 141                         struct platform_device *pdev)
 142 {
 143         struct at91_usbh_data *board;
 144         struct ohci_hcd *ohci;
 145         int retval;
 146         struct usb_hcd *hcd;
 147         struct ohci_at91_priv *ohci_at91;
 148         struct device *dev = &pdev->dev;
 149         struct resource *res;
 150         int irq;
 151
 152         irq = platform_get_irq(pdev, 0);
 153         if (irq < 0) {
 154                 dev_dbg(dev, "hcd probe: missing irq resource\n");
 155                 return irq;
 156         }
 157
 158         hcd = usb_create_hcd(driver, dev, "at91");
 159         if (!hcd)
 160                 return -ENOMEM;
 161         ohci_at91 = hcd_to_ohci_at91_priv(hcd);
 162
 163         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 164         hcd->regs = devm_ioremap_resource(dev, res);
 165         if (IS_ERR(hcd->regs)) {
 166                 retval = PTR_ERR(hcd->regs);
 167                 goto err;
 168         }
 169         hcd->rsrc_start = res->start;
 170         hcd->rsrc_len = resource_size(res);
 171
 172         ohci_at91->iclk = devm_clk_get(dev, "ohci_clk");
 173         if (IS_ERR(ohci_at91->iclk)) {
 174                 dev_err(dev, "failed to get ohci_clk\n");
 175                 retval = PTR_ERR(ohci_at91->iclk);
 176                 goto err;
 177         }
 178         ohci_at91->fclk = devm_clk_get(dev, "uhpck");
 179         if (IS_ERR(ohci_at91->fclk)) {
 180                 dev_err(dev, "failed to get uhpck\n");
 181                 retval = PTR_ERR(ohci_at91->fclk);
 182                 goto err;
 183         }
 184         ohci_at91->hclk = devm_clk_get(dev, "hclk");
 185         if (IS_ERR(ohci_at91->hclk)) {
 186                 dev_err(dev, "failed to get hclk\n");
 187                 retval = PTR_ERR(ohci_at91->hclk);
 188                 goto err;
 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 |=
 360                         cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM);
 361
 362                 if (pdata->overcurrent_supported) {
 363                         desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
 364                         desc->wHubCharacteristics |=
 365                                 cpu_to_le16(HUB_CHAR_INDV_PORT_OCPM);
 366                 }
 367
 368                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
 369                         desc->wHubCharacteristics);
 370
 371                 return ret;
 372
 373         case GetPortStatus:
 374                 /* check port status */
 375
 376                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
 377
 378                 if (valid_port(wIndex)) {
 379                         if (!ohci_at91_usb_get_power(pdata, wIndex))
 380                                 *data &= ~cpu_to_le32(RH_PS_PPS);
 381
 382                         if (pdata->overcurrent_changed[wIndex])
 383                                 *data |= cpu_to_le32(RH_PS_OCIC);
 384
 385                         if (pdata->overcurrent_status[wIndex])
 386                                 *data |= cpu_to_le32(RH_PS_POCI);
 387                 }
 388         }
 389
 390  out:
 391         return ret;
 392 }
 393
 394 /*-------------------------------------------------------------------------*/
 395
 396 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
 397 {
 398         struct platform_device *pdev = data;
 399         struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
 400         int val, gpio, port;
 401
 402         /* From the GPIO notifying the over-current situation, find
 403          * out the corresponding port */
 404         at91_for_each_port(port) {
 405                 if (gpio_is_valid(pdata->overcurrent_pin[port]) &&
 406                                 gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
 407                         gpio = pdata->overcurrent_pin[port];
 408                         break;
 409                 }
 410         }
 411
 412         if (port == AT91_MAX_USBH_PORTS) {
 413                 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
 414                 return IRQ_HANDLED;
 415         }
 416
 417         val = gpio_get_value(gpio);
 418
 419         /* When notified of an over-current situation, disable power
 420            on the corresponding port, and mark this port in
 421            over-current. */
 422         if (!val) {
 423                 ohci_at91_usb_set_power(pdata, port, 0);
 424                 pdata->overcurrent_status[port]  = 1;
 425                 pdata->overcurrent_changed[port] = 1;
 426         }
 427
 428         dev_dbg(& pdev->dev, "overcurrent situation %s\n",
 429                 val ? "exited" : "notified");
 430
 431         return IRQ_HANDLED;
 432 }
 433
 434 #ifdef CONFIG_OF
 435 static const struct of_device_id at91_ohci_dt_ids[] = {
 436         { .compatible = "atmel,at91rm9200-ohci" },
 437         { /* sentinel */ }
 438 };
 439
 440 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
 441
 442 static int ohci_at91_of_init(struct platform_device *pdev)
 443 {
 444         struct device_node *np = pdev->dev.of_node;
 445         int i, gpio, ret;
 446         enum of_gpio_flags flags;
 447         struct at91_usbh_data   *pdata;
 448         u32 ports;
 449
 450         if (!np)
 451                 return 0;
 452
 453         /* Right now device-tree probed devices don't get dma_mask set.
 454          * Since shared usb code relies on it, set it here for now.
 455          * Once we have dma capability bindings this can go away.
 456          */
 457         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 458         if (ret)
 459                 return ret;
 460
 461         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 462         if (!pdata)
 463                 return -ENOMEM;
 464
 465         if (!of_property_read_u32(np, "num-ports", &ports))
 466                 pdata->ports = ports;
 467
 468         at91_for_each_port(i) {
 469                 gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
 470                 pdata->vbus_pin[i] = gpio;
 471                 if (!gpio_is_valid(gpio))
 472                         continue;
 473                 pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
 474         }
 475
 476         at91_for_each_port(i)
 477                 pdata->overcurrent_pin[i] =
 478                         of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
 479
 480         pdev->dev.platform_data = pdata;
 481
 482         return 0;
 483 }
 484 #else
 485 static int ohci_at91_of_init(struct platform_device *pdev)
 486 {
 487         return 0;
 488 }
 489 #endif
 490
 491 /*-------------------------------------------------------------------------*/
 492
 493 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
 494 {
 495         struct at91_usbh_data   *pdata;
 496         int                     i;
 497         int                     gpio;
 498         int                     ret;
 499
 500         ret = ohci_at91_of_init(pdev);
 501         if (ret)
 502                 return ret;
 503
 504         pdata = dev_get_platdata(&pdev->dev);
 505
 506         if (pdata) {
 507                 at91_for_each_port(i) {
 508                         /*
 509                          * do not configure PIO if not in relation with
 510                          * real USB port on board
 511                          */
 512                         if (i >= pdata->ports) {
 513                                 pdata->vbus_pin[i] = -EINVAL;
 514                                 pdata->overcurrent_pin[i] = -EINVAL;
 515                                 break;
 516                         }
 517
 518                         if (!gpio_is_valid(pdata->vbus_pin[i]))
 519                                 continue;
 520                         gpio = pdata->vbus_pin[i];
 521
 522                         ret = gpio_request(gpio, "ohci_vbus");
 523                         if (ret) {
 524                                 dev_err(&pdev->dev,
 525                                         "can't request vbus gpio %d\n", gpio);
 526                                 continue;
 527                         }
 528                         ret = gpio_direction_output(gpio,
 529                                                 !pdata->vbus_pin_active_low[i]);
 530                         if (ret) {
 531                                 dev_err(&pdev->dev,
 532                                         "can't put vbus gpio %d as output %d\n",
 533                                         gpio, !pdata->vbus_pin_active_low[i]);
 534                                 gpio_free(gpio);
 535                                 continue;
 536                         }
 537
 538                         ohci_at91_usb_set_power(pdata, i, 1);
 539                 }
 540
 541                 at91_for_each_port(i) {
 542                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
 543                                 continue;
 544                         gpio = pdata->overcurrent_pin[i];
 545
 546                         ret = gpio_request(gpio, "ohci_overcurrent");
 547                         if (ret) {
 548                                 dev_err(&pdev->dev,
 549                                         "can't request overcurrent gpio %d\n",
 550                                         gpio);
 551                                 continue;
 552                         }
 553
 554                         ret = gpio_direction_input(gpio);
 555                         if (ret) {
 556                                 dev_err(&pdev->dev,
 557                                         "can't configure overcurrent gpio %d as input\n",
 558                                         gpio);
 559                                 gpio_free(gpio);
 560                                 continue;
 561                         }
 562
 563                         ret = request_irq(gpio_to_irq(gpio),
 564                                           ohci_hcd_at91_overcurrent_irq,
 565                                           IRQF_SHARED, "ohci_overcurrent", pdev);
 566                         if (ret) {
 567                                 gpio_free(gpio);
 568                                 dev_err(&pdev->dev,
 569                                         "can't get gpio IRQ for overcurrent\n");
 570                         }
 571                 }
 572         }
 573
 574         device_init_wakeup(&pdev->dev, 1);
 575         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 576 }
 577
 578 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
 579 {
 580         struct at91_usbh_data   *pdata = dev_get_platdata(&pdev->dev);
 581         int                     i;
 582
 583         if (pdata) {
 584                 at91_for_each_port(i) {
 585                         if (!gpio_is_valid(pdata->vbus_pin[i]))
 586                                 continue;
 587                         ohci_at91_usb_set_power(pdata, i, 0);
 588                         gpio_free(pdata->vbus_pin[i]);
 589                 }
 590
 591                 at91_for_each_port(i) {
 592                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
 593                                 continue;
 594                         free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
 595                         gpio_free(pdata->overcurrent_pin[i]);
 596                 }
 597         }
 598
 599         device_init_wakeup(&pdev->dev, 0);
 600         usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
 601         return 0;
 602 }
 603
 604 #ifdef CONFIG_PM
 605
 606 static int
 607 ohci_hcd_at91_drv_suspend(struct device *dev)
 608 {
 609         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 610         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 611         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
 612         int             ret;
 613
 614         /*
 615          * Disable wakeup if we are going to sleep with slow clock mode
 616          * enabled.
 617          */
 618         ohci_at91->wakeup = device_may_wakeup(dev)
 619                         && !at91_suspend_entering_slow_clock();
 620
 621         if (ohci_at91->wakeup)
 622                 enable_irq_wake(hcd->irq);
 623
 624         ret = ohci_suspend(hcd, ohci_at91->wakeup);
 625         if (ret) {
 626                 if (ohci_at91->wakeup)
 627                         disable_irq_wake(hcd->irq);
 628                 return ret;
 629         }
 630         /*
 631          * The integrated transceivers seem unable to notice disconnect,
 632          * reconnect, or wakeup without the 48 MHz clock active.  so for
 633          * correctness, always discard connection state (using reset).
 634          *
 635          * REVISIT: some boards will be able to turn VBUS off...
 636          */
 637         if (!ohci_at91->wakeup) {
 638                 ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
 639                 ohci->hc_control &= OHCI_CTRL_RWC;
 640                 ohci_writel(ohci, ohci->hc_control, &ohci->regs->control);
 641                 ohci->rh_state = OHCI_RH_HALTED;
 642
 643                 /* flush the writes */
 644                 (void) ohci_readl (ohci, &ohci->regs->control);
 645                 at91_stop_clock(ohci_at91);
 646         }
 647
 648         return ret;
 649 }
 650
 651 static int ohci_hcd_at91_drv_resume(struct device *dev)
 652 {
 653         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 654         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
 655
 656         if (ohci_at91->wakeup)
 657                 disable_irq_wake(hcd->irq);
 658
 659         at91_start_clock(ohci_at91);
 660
 661         ohci_resume(hcd, false);
 662         return 0;
 663 }
 664 #endif
 665
 666 static SIMPLE_DEV_PM_OPS(ohci_hcd_at91_pm_ops, ohci_hcd_at91_drv_suspend,
 667                                         ohci_hcd_at91_drv_resume);
 668
 669 static struct platform_driver ohci_hcd_at91_driver = {
 670         .probe          = ohci_hcd_at91_drv_probe,
 671         .remove         = ohci_hcd_at91_drv_remove,
 672         .shutdown       = usb_hcd_platform_shutdown,
 673         .driver         = {
 674                 .name   = "at91_ohci",
 675                 .pm     = &ohci_hcd_at91_pm_ops,
 676                 .of_match_table = of_match_ptr(at91_ohci_dt_ids),
 677         },
 678 };
 679
 680 static int __init ohci_at91_init(void)
 681 {
 682         if (usb_disabled())
 683                 return -ENODEV;
 684
 685         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 686         ohci_init_driver(&ohci_at91_hc_driver, &ohci_at91_drv_overrides);
 687
 688         /*
 689          * The Atmel HW has some unusual quirks, which require Atmel-specific
 690          * workarounds. We override certain hc_driver functions here to
 691          * achieve that. We explicitly do not enhance ohci_driver_overrides to
 692          * allow this more easily, since this is an unusual case, and we don't
 693          * want to encourage others to override these functions by making it
 694          * too easy.
 695          */
 696
 697         ohci_at91_hc_driver.hub_status_data     = ohci_at91_hub_status_data;
 698         ohci_at91_hc_driver.hub_control         = ohci_at91_hub_control;
 699
 700         return platform_driver_register(&ohci_hcd_at91_driver);
 701 }
 702 module_init(ohci_at91_init);
 703
 704 static void __exit ohci_at91_cleanup(void)
 705 {
 706         platform_driver_unregister(&ohci_hcd_at91_driver);
 707 }
 708 module_exit(ohci_at91_cleanup);
 709
 710 MODULE_DESCRIPTION(DRIVER_DESC);
 711 MODULE_LICENSE("GPL");
 712 MODULE_ALIAS("platform:at91_ohci");