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 static int (*orig_ohci_hub_control)(struct usb_hcd  *hcd, u16 typeReq,
  50                         u16 wValue, u16 wIndex, char *buf, u16 wLength);
  51 static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf);
  52
  53 extern int usb_disabled(void);
  54
  55 /*-------------------------------------------------------------------------*/
  56
  57 static void at91_start_clock(void)
  58 {
  59         if (IS_ENABLED(CONFIG_COMMON_CLK)) {
  60                 clk_set_rate(uclk, 48000000);
  61                 clk_prepare_enable(uclk);
  62         }
  63         clk_prepare_enable(hclk);
  64         clk_prepare_enable(iclk);
  65         clk_prepare_enable(fclk);
  66         clocked = 1;
  67 }
  68
  69 static void at91_stop_clock(void)
  70 {
  71         clk_disable_unprepare(fclk);
  72         clk_disable_unprepare(iclk);
  73         clk_disable_unprepare(hclk);
  74         if (IS_ENABLED(CONFIG_COMMON_CLK))
  75                 clk_disable_unprepare(uclk);
  76         clocked = 0;
  77 }
  78
  79 static void at91_start_hc(struct platform_device *pdev)
  80 {
  81         struct usb_hcd *hcd = platform_get_drvdata(pdev);
  82         struct ohci_regs __iomem *regs = hcd->regs;
  83
  84         dev_dbg(&pdev->dev, "start\n");
  85
  86         /*
  87          * Start the USB clocks.
  88          */
  89         at91_start_clock();
  90
  91         /*
  92          * The USB host controller must remain in reset.
  93          */
  94         writel(0, &regs->control);
  95 }
  96
  97 static void at91_stop_hc(struct platform_device *pdev)
  98 {
  99         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 100         struct ohci_regs __iomem *regs = hcd->regs;
 101
 102         dev_dbg(&pdev->dev, "stop\n");
 103
 104         /*
 105          * Put the USB host controller into reset.
 106          */
 107         writel(0, &regs->control);
 108
 109         /*
 110          * Stop the USB clocks.
 111          */
 112         at91_stop_clock();
 113 }
 114
 115
 116 /*-------------------------------------------------------------------------*/
 117
 118 static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
 119
 120 /* configure so an HC device and id are always provided */
 121 /* always called with process context; sleeping is OK */
 122
 123
 124 /**
 125  * usb_hcd_at91_probe - initialize AT91-based HCDs
 126  * Context: !in_interrupt()
 127  *
 128  * Allocates basic resources for this USB host controller, and
 129  * then invokes the start() method for the HCD associated with it
 130  * through the hotplug entry's driver_data.
 131  */
 132 static int usb_hcd_at91_probe(const struct hc_driver *driver,
 133                         struct platform_device *pdev)
 134 {
 135         struct at91_usbh_data *board;
 136         struct ohci_hcd *ohci;
 137         int retval;
 138         struct usb_hcd *hcd = NULL;
 139         struct device *dev = &pdev->dev;
 140         struct resource *res;
 141         int irq;
 142
 143         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 144         if (!res) {
 145                 dev_dbg(dev, "hcd probe: missing memory resource\n");
 146                 return -ENXIO;
 147         }
 148
 149         irq = platform_get_irq(pdev, 0);
 150         if (irq < 0) {
 151                 dev_dbg(dev, "hcd probe: missing irq resource\n");
 152                 return irq;
 153         }
 154
 155         hcd = usb_create_hcd(driver, &pdev->dev, "at91");
 156         if (!hcd)
 157                 return -ENOMEM;
 158         hcd->rsrc_start = res->start;
 159         hcd->rsrc_len = resource_size(res);
 160
 161         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 162                 pr_debug("request_mem_region failed\n");
 163                 retval = -EBUSY;
 164                 goto err1;
 165         }
 166
 167         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 168         if (!hcd->regs) {
 169                 pr_debug("ioremap failed\n");
 170                 retval = -EIO;
 171                 goto err2;
 172         }
 173
 174         iclk = clk_get(&pdev->dev, "ohci_clk");
 175         if (IS_ERR(iclk)) {
 176                 dev_err(&pdev->dev, "failed to get ohci_clk\n");
 177                 retval = PTR_ERR(iclk);
 178                 goto err3;
 179         }
 180         fclk = clk_get(&pdev->dev, "uhpck");
 181         if (IS_ERR(fclk)) {
 182                 dev_err(&pdev->dev, "failed to get uhpck\n");
 183                 retval = PTR_ERR(fclk);
 184                 goto err4;
 185         }
 186         hclk = clk_get(&pdev->dev, "hclk");
 187         if (IS_ERR(hclk)) {
 188                 dev_err(&pdev->dev, "failed to get hclk\n");
 189                 retval = PTR_ERR(hclk);
 190                 goto err5;
 191         }
 192         if (IS_ENABLED(CONFIG_COMMON_CLK)) {
 193                 uclk = clk_get(&pdev->dev, "usb_clk");
 194                 if (IS_ERR(uclk)) {
 195                         dev_err(&pdev->dev, "failed to get uclk\n");
 196                         retval = PTR_ERR(uclk);
 197                         goto err6;
 198                 }
 199         }
 200
 201         board = hcd->self.controller->platform_data;
 202         ohci = hcd_to_ohci(hcd);
 203         ohci->num_ports = board->ports;
 204         at91_start_hc(pdev);
 205
 206         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 207         if (retval == 0)
 208                 return retval;
 209
 210         /* Error handling */
 211         at91_stop_hc(pdev);
 212
 213         if (IS_ENABLED(CONFIG_COMMON_CLK))
 214                 clk_put(uclk);
 215  err6:
 216         clk_put(hclk);
 217  err5:
 218         clk_put(fclk);
 219  err4:
 220         clk_put(iclk);
 221
 222  err3:
 223         iounmap(hcd->regs);
 224
 225  err2:
 226         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 227
 228  err1:
 229         usb_put_hcd(hcd);
 230         return retval;
 231 }
 232
 233
 234 /* may be called with controller, bus, and devices active */
 235
 236 /**
 237  * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
 238  * @dev: USB Host Controller being removed
 239  * Context: !in_interrupt()
 240  *
 241  * Reverses the effect of usb_hcd_at91_probe(), first invoking
 242  * the HCD's stop() method.  It is always called from a thread
 243  * context, "rmmod" or something similar.
 244  *
 245  */
 246 static void usb_hcd_at91_remove(struct usb_hcd *hcd,
 247                                 struct platform_device *pdev)
 248 {
 249         usb_remove_hcd(hcd);
 250         at91_stop_hc(pdev);
 251         iounmap(hcd->regs);
 252         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 253         usb_put_hcd(hcd);
 254
 255         if (IS_ENABLED(CONFIG_COMMON_CLK))
 256                 clk_put(uclk);
 257         clk_put(hclk);
 258         clk_put(fclk);
 259         clk_put(iclk);
 260         fclk = iclk = hclk = NULL;
 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         if (!gpio_is_valid(pdata->vbus_pin[port]))
 270                 return;
 271
 272         gpio_set_value(pdata->vbus_pin[port],
 273                        pdata->vbus_pin_active_low[port] ^ enable);
 274 }
 275
 276 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
 277 {
 278         if (!valid_port(port))
 279                 return -EINVAL;
 280
 281         if (!gpio_is_valid(pdata->vbus_pin[port]))
 282                 return -EINVAL;
 283
 284         return gpio_get_value(pdata->vbus_pin[port]) ^
 285                 pdata->vbus_pin_active_low[port];
 286 }
 287
 288 /*
 289  * Update the status data from the hub with the over-current indicator change.
 290  */
 291 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
 292 {
 293         struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
 294         int length = orig_ohci_hub_status_data(hcd, buf);
 295         int port;
 296
 297         at91_for_each_port(port) {
 298                 if (pdata->overcurrent_changed[port]) {
 299                         if (!length)
 300                                 length = 1;
 301                         buf[0] |= 1 << (port + 1);
 302                 }
 303         }
 304
 305         return length;
 306 }
 307
 308 /*
 309  * Look at the control requests to the root hub and see if we need to override.
 310  */
 311 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 312                                  u16 wIndex, char *buf, u16 wLength)
 313 {
 314         struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
 315         struct usb_hub_descriptor *desc;
 316         int ret = -EINVAL;
 317         u32 *data = (u32 *)buf;
 318
 319         dev_dbg(hcd->self.controller,
 320                 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
 321                 hcd, typeReq, wValue, wIndex, buf, wLength);
 322
 323         wIndex--;
 324
 325         switch (typeReq) {
 326         case SetPortFeature:
 327                 if (wValue == USB_PORT_FEAT_POWER) {
 328                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
 329                         if (valid_port(wIndex)) {
 330                                 ohci_at91_usb_set_power(pdata, wIndex, 1);
 331                                 ret = 0;
 332                         }
 333
 334                         goto out;
 335                 }
 336                 break;
 337
 338         case ClearPortFeature:
 339                 switch (wValue) {
 340                 case USB_PORT_FEAT_C_OVER_CURRENT:
 341                         dev_dbg(hcd->self.controller,
 342                                 "ClearPortFeature: C_OVER_CURRENT\n");
 343
 344                         if (valid_port(wIndex)) {
 345                                 pdata->overcurrent_changed[wIndex] = 0;
 346                                 pdata->overcurrent_status[wIndex] = 0;
 347                         }
 348
 349                         goto out;
 350
 351                 case USB_PORT_FEAT_OVER_CURRENT:
 352                         dev_dbg(hcd->self.controller,
 353                                 "ClearPortFeature: OVER_CURRENT\n");
 354
 355                         if (valid_port(wIndex))
 356                                 pdata->overcurrent_status[wIndex] = 0;
 357
 358                         goto out;
 359
 360                 case USB_PORT_FEAT_POWER:
 361                         dev_dbg(hcd->self.controller,
 362                                 "ClearPortFeature: POWER\n");
 363
 364                         if (valid_port(wIndex)) {
 365                                 ohci_at91_usb_set_power(pdata, wIndex, 0);
 366                                 return 0;
 367                         }
 368                 }
 369                 break;
 370         }
 371
 372         ret = orig_ohci_hub_control(hcd, typeReq, wValue, wIndex + 1,
 373                                 buf, wLength);
 374         if (ret)
 375                 goto out;
 376
 377         switch (typeReq) {
 378         case GetHubDescriptor:
 379
 380                 /* update the hub's descriptor */
 381
 382                 desc = (struct usb_hub_descriptor *)buf;
 383
 384                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
 385                         desc->wHubCharacteristics);
 386
 387                 /* remove the old configurations for power-switching, and
 388                  * over-current protection, and insert our new configuration
 389                  */
 390
 391                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
 392                 desc->wHubCharacteristics |= cpu_to_le16(0x0001);
 393
 394                 if (pdata->overcurrent_supported) {
 395                         desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
 396                         desc->wHubCharacteristics |=  cpu_to_le16(0x0008|0x0001);
 397                 }
 398
 399                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
 400                         desc->wHubCharacteristics);
 401
 402                 return ret;
 403
 404         case GetPortStatus:
 405                 /* check port status */
 406
 407                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
 408
 409                 if (valid_port(wIndex)) {
 410                         if (!ohci_at91_usb_get_power(pdata, wIndex))
 411                                 *data &= ~cpu_to_le32(RH_PS_PPS);
 412
 413                         if (pdata->overcurrent_changed[wIndex])
 414                                 *data |= cpu_to_le32(RH_PS_OCIC);
 415
 416                         if (pdata->overcurrent_status[wIndex])
 417                                 *data |= cpu_to_le32(RH_PS_POCI);
 418                 }
 419         }
 420
 421  out:
 422         return ret;
 423 }
 424
 425 /*-------------------------------------------------------------------------*/
 426
 427 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
 428 {
 429         struct platform_device *pdev = data;
 430         struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
 431         int val, gpio, port;
 432
 433         /* From the GPIO notifying the over-current situation, find
 434          * out the corresponding port */
 435         at91_for_each_port(port) {
 436                 if (gpio_is_valid(pdata->overcurrent_pin[port]) &&
 437                                 gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
 438                         gpio = pdata->overcurrent_pin[port];
 439                         break;
 440                 }
 441         }
 442
 443         if (port == AT91_MAX_USBH_PORTS) {
 444                 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
 445                 return IRQ_HANDLED;
 446         }
 447
 448         val = gpio_get_value(gpio);
 449
 450         /* When notified of an over-current situation, disable power
 451            on the corresponding port, and mark this port in
 452            over-current. */
 453         if (!val) {
 454                 ohci_at91_usb_set_power(pdata, port, 0);
 455                 pdata->overcurrent_status[port]  = 1;
 456                 pdata->overcurrent_changed[port] = 1;
 457         }
 458
 459         dev_dbg(& pdev->dev, "overcurrent situation %s\n",
 460                 val ? "exited" : "notified");
 461
 462         return IRQ_HANDLED;
 463 }
 464
 465 #ifdef CONFIG_OF
 466 static const struct of_device_id at91_ohci_dt_ids[] = {
 467         { .compatible = "atmel,at91rm9200-ohci" },
 468         { /* sentinel */ }
 469 };
 470
 471 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
 472
 473 static int ohci_at91_of_init(struct platform_device *pdev)
 474 {
 475         struct device_node *np = pdev->dev.of_node;
 476         int i, gpio, ret;
 477         enum of_gpio_flags flags;
 478         struct at91_usbh_data   *pdata;
 479         u32 ports;
 480
 481         if (!np)
 482                 return 0;
 483
 484         /* Right now device-tree probed devices don't get dma_mask set.
 485          * Since shared usb code relies on it, set it here for now.
 486          * Once we have dma capability bindings this can go away.
 487          */
 488         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 489         if (ret)
 490                 return ret;
 491
 492         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 493         if (!pdata)
 494                 return -ENOMEM;
 495
 496         if (!of_property_read_u32(np, "num-ports", &ports))
 497                 pdata->ports = ports;
 498
 499         at91_for_each_port(i) {
 500                 gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
 501                 pdata->vbus_pin[i] = gpio;
 502                 if (!gpio_is_valid(gpio))
 503                         continue;
 504                 pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
 505         }
 506
 507         at91_for_each_port(i)
 508                 pdata->overcurrent_pin[i] =
 509                         of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
 510
 511         pdev->dev.platform_data = pdata;
 512
 513         return 0;
 514 }
 515 #else
 516 static int ohci_at91_of_init(struct platform_device *pdev)
 517 {
 518         return 0;
 519 }
 520 #endif
 521
 522 /*-------------------------------------------------------------------------*/
 523
 524 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
 525 {
 526         struct at91_usbh_data   *pdata;
 527         int                     i;
 528         int                     gpio;
 529         int                     ret;
 530
 531         ret = ohci_at91_of_init(pdev);
 532         if (ret)
 533                 return ret;
 534
 535         pdata = dev_get_platdata(&pdev->dev);
 536
 537         if (pdata) {
 538                 at91_for_each_port(i) {
 539                         /*
 540                          * do not configure PIO if not in relation with
 541                          * real USB port on board
 542                          */
 543                         if (i >= pdata->ports) {
 544                                 pdata->vbus_pin[i] = -EINVAL;
 545                                 pdata->overcurrent_pin[i] = -EINVAL;
 546                                 break;
 547                         }
 548
 549                         if (!gpio_is_valid(pdata->vbus_pin[i]))
 550                                 continue;
 551                         gpio = pdata->vbus_pin[i];
 552
 553                         ret = gpio_request(gpio, "ohci_vbus");
 554                         if (ret) {
 555                                 dev_err(&pdev->dev,
 556                                         "can't request vbus gpio %d\n", gpio);
 557                                 continue;
 558                         }
 559                         ret = gpio_direction_output(gpio,
 560                                                 !pdata->vbus_pin_active_low[i]);
 561                         if (ret) {
 562                                 dev_err(&pdev->dev,
 563                                         "can't put vbus gpio %d as output %d\n",
 564                                         gpio, !pdata->vbus_pin_active_low[i]);
 565                                 gpio_free(gpio);
 566                                 continue;
 567                         }
 568
 569                         ohci_at91_usb_set_power(pdata, i, 1);
 570                 }
 571
 572                 at91_for_each_port(i) {
 573                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
 574                                 continue;
 575                         gpio = pdata->overcurrent_pin[i];
 576
 577                         ret = gpio_request(gpio, "ohci_overcurrent");
 578                         if (ret) {
 579                                 dev_err(&pdev->dev,
 580                                         "can't request overcurrent gpio %d\n",
 581                                         gpio);
 582                                 continue;
 583                         }
 584
 585                         ret = gpio_direction_input(gpio);
 586                         if (ret) {
 587                                 dev_err(&pdev->dev,
 588                                         "can't configure overcurrent gpio %d as input\n",
 589                                         gpio);
 590                                 gpio_free(gpio);
 591                                 continue;
 592                         }
 593
 594                         ret = request_irq(gpio_to_irq(gpio),
 595                                           ohci_hcd_at91_overcurrent_irq,
 596                                           IRQF_SHARED, "ohci_overcurrent", pdev);
 597                         if (ret) {
 598                                 gpio_free(gpio);
 599                                 dev_err(&pdev->dev,
 600                                         "can't get gpio IRQ for overcurrent\n");
 601                         }
 602                 }
 603         }
 604
 605         device_init_wakeup(&pdev->dev, 1);
 606         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 607 }
 608
 609 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
 610 {
 611         struct at91_usbh_data   *pdata = dev_get_platdata(&pdev->dev);
 612         int                     i;
 613
 614         if (pdata) {
 615                 at91_for_each_port(i) {
 616                         if (!gpio_is_valid(pdata->vbus_pin[i]))
 617                                 continue;
 618                         ohci_at91_usb_set_power(pdata, i, 0);
 619                         gpio_free(pdata->vbus_pin[i]);
 620                 }
 621
 622                 at91_for_each_port(i) {
 623                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
 624                                 continue;
 625                         free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
 626                         gpio_free(pdata->overcurrent_pin[i]);
 627                 }
 628         }
 629
 630         device_init_wakeup(&pdev->dev, 0);
 631         usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
 632         return 0;
 633 }
 634
 635 #ifdef CONFIG_PM
 636
 637 static int
 638 ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
 639 {
 640         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 641         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 642
 643         if (device_may_wakeup(&pdev->dev))
 644                 enable_irq_wake(hcd->irq);
 645
 646         /*
 647          * The integrated transceivers seem unable to notice disconnect,
 648          * reconnect, or wakeup without the 48 MHz clock active.  so for
 649          * correctness, always discard connection state (using reset).
 650          *
 651          * REVISIT: some boards will be able to turn VBUS off...
 652          */
 653         if (at91_suspend_entering_slow_clock()) {
 654                 ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
 655                 ohci->hc_control &= OHCI_CTRL_RWC;
 656                 ohci_writel(ohci, ohci->hc_control, &ohci->regs->control);
 657                 ohci->rh_state = OHCI_RH_HALTED;
 658
 659                 /* flush the writes */
 660                 (void) ohci_readl (ohci, &ohci->regs->control);
 661                 at91_stop_clock();
 662         }
 663
 664         return 0;
 665 }
 666
 667 static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
 668 {
 669         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 670
 671         if (device_may_wakeup(&pdev->dev))
 672                 disable_irq_wake(hcd->irq);
 673
 674         if (!clocked)
 675                 at91_start_clock();
 676
 677         ohci_resume(hcd, false);
 678         return 0;
 679 }
 680 #else
 681 #define ohci_hcd_at91_drv_suspend NULL
 682 #define ohci_hcd_at91_drv_resume  NULL
 683 #endif
 684
 685 static struct platform_driver ohci_hcd_at91_driver = {
 686         .probe          = ohci_hcd_at91_drv_probe,
 687         .remove         = ohci_hcd_at91_drv_remove,
 688         .shutdown       = usb_hcd_platform_shutdown,
 689         .suspend        = ohci_hcd_at91_drv_suspend,
 690         .resume         = ohci_hcd_at91_drv_resume,
 691         .driver         = {
 692                 .name   = "at91_ohci",
 693                 .owner  = THIS_MODULE,
 694                 .of_match_table = of_match_ptr(at91_ohci_dt_ids),
 695         },
 696 };
 697
 698 static int __init ohci_at91_init(void)
 699 {
 700         if (usb_disabled())
 701                 return -ENODEV;
 702
 703         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 704         ohci_init_driver(&ohci_at91_hc_driver, NULL);
 705
 706         /*
 707          * The Atmel HW has some unusual quirks, which require Atmel-specific
 708          * workarounds. We override certain hc_driver functions here to
 709          * achieve that. We explicitly do not enhance ohci_driver_overrides to
 710          * allow this more easily, since this is an unusual case, and we don't
 711          * want to encourage others to override these functions by making it
 712          * too easy.
 713          */
 714
 715         orig_ohci_hub_control = ohci_at91_hc_driver.hub_control;
 716         orig_ohci_hub_status_data = ohci_at91_hc_driver.hub_status_data;
 717
 718         ohci_at91_hc_driver.hub_status_data     = ohci_at91_hub_status_data;
 719         ohci_at91_hc_driver.hub_control         = ohci_at91_hub_control;
 720
 721         return platform_driver_register(&ohci_hcd_at91_driver);
 722 }
 723 module_init(ohci_at91_init);
 724
 725 static void __exit ohci_at91_cleanup(void)
 726 {
 727         platform_driver_unregister(&ohci_hcd_at91_driver);
 728 }
 729 module_exit(ohci_at91_cleanup);
 730
 731 MODULE_DESCRIPTION(DRIVER_DESC);
 732 MODULE_LICENSE("GPL");
 733 MODULE_ALIAS("platform:at91_ohci");