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