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