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
 140         if (pdev->num_resources != 2) {
 141                 pr_debug("hcd probe: invalid num_resources");
 142                 return -ENODEV;
 143         }
 144
 145         if ((pdev->resource[0].flags != IORESOURCE_MEM)
 146                         || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
 147                 pr_debug("hcd probe: invalid resource type\n");
 148                 return -ENODEV;
 149         }
 150
 151         hcd = usb_create_hcd(driver, &pdev->dev, "at91");
 152         if (!hcd)
 153                 return -ENOMEM;
 154         hcd->rsrc_start = pdev->resource[0].start;
 155         hcd->rsrc_len = resource_size(&pdev->resource[0]);
 156
 157         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 158                 pr_debug("request_mem_region failed\n");
 159                 retval = -EBUSY;
 160                 goto err1;
 161         }
 162
 163         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 164         if (!hcd->regs) {
 165                 pr_debug("ioremap failed\n");
 166                 retval = -EIO;
 167                 goto err2;
 168         }
 169
 170         iclk = clk_get(&pdev->dev, "ohci_clk");
 171         if (IS_ERR(iclk)) {
 172                 dev_err(&pdev->dev, "failed to get ohci_clk\n");
 173                 retval = PTR_ERR(iclk);
 174                 goto err3;
 175         }
 176         fclk = clk_get(&pdev->dev, "uhpck");
 177         if (IS_ERR(fclk)) {
 178                 dev_err(&pdev->dev, "failed to get uhpck\n");
 179                 retval = PTR_ERR(fclk);
 180                 goto err4;
 181         }
 182         hclk = clk_get(&pdev->dev, "hclk");
 183         if (IS_ERR(hclk)) {
 184                 dev_err(&pdev->dev, "failed to get hclk\n");
 185                 retval = PTR_ERR(hclk);
 186                 goto err5;
 187         }
 188         if (IS_ENABLED(CONFIG_COMMON_CLK)) {
 189                 uclk = clk_get(&pdev->dev, "usb_clk");
 190                 if (IS_ERR(uclk)) {
 191                         dev_err(&pdev->dev, "failed to get uclk\n");
 192                         retval = PTR_ERR(uclk);
 193                         goto err6;
 194                 }
 195         }
 196
 197         board = hcd->self.controller->platform_data;
 198         ohci = hcd_to_ohci(hcd);
 199         ohci->num_ports = board->ports;
 200         at91_start_hc(pdev);
 201
 202         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
 203         if (retval == 0)
 204                 return retval;
 205
 206         /* Error handling */
 207         at91_stop_hc(pdev);
 208
 209         if (IS_ENABLED(CONFIG_COMMON_CLK))
 210                 clk_put(uclk);
 211  err6:
 212         clk_put(hclk);
 213  err5:
 214         clk_put(fclk);
 215  err4:
 216         clk_put(iclk);
 217
 218  err3:
 219         iounmap(hcd->regs);
 220
 221  err2:
 222         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 223
 224  err1:
 225         usb_put_hcd(hcd);
 226         return retval;
 227 }
 228
 229
 230 /* may be called with controller, bus, and devices active */
 231
 232 /**
 233  * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
 234  * @dev: USB Host Controller being removed
 235  * Context: !in_interrupt()
 236  *
 237  * Reverses the effect of usb_hcd_at91_probe(), first invoking
 238  * the HCD's stop() method.  It is always called from a thread
 239  * context, "rmmod" or something similar.
 240  *
 241  */
 242 static void usb_hcd_at91_remove(struct usb_hcd *hcd,
 243                                 struct platform_device *pdev)
 244 {
 245         usb_remove_hcd(hcd);
 246         at91_stop_hc(pdev);
 247         iounmap(hcd->regs);
 248         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 249         usb_put_hcd(hcd);
 250
 251         if (IS_ENABLED(CONFIG_COMMON_CLK))
 252                 clk_put(uclk);
 253         clk_put(hclk);
 254         clk_put(fclk);
 255         clk_put(iclk);
 256         fclk = iclk = hclk = NULL;
 257 }
 258
 259 /*-------------------------------------------------------------------------*/
 260 static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
 261 {
 262         if (!valid_port(port))
 263                 return;
 264
 265         if (!gpio_is_valid(pdata->vbus_pin[port]))
 266                 return;
 267
 268         gpio_set_value(pdata->vbus_pin[port],
 269                        pdata->vbus_pin_active_low[port] ^ enable);
 270 }
 271
 272 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
 273 {
 274         if (!valid_port(port))
 275                 return -EINVAL;
 276
 277         if (!gpio_is_valid(pdata->vbus_pin[port]))
 278                 return -EINVAL;
 279
 280         return gpio_get_value(pdata->vbus_pin[port]) ^
 281                 pdata->vbus_pin_active_low[port];
 282 }
 283
 284 /*
 285  * Update the status data from the hub with the over-current indicator change.
 286  */
 287 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
 288 {
 289         struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
 290         int length = orig_ohci_hub_status_data(hcd, buf);
 291         int port;
 292
 293         at91_for_each_port(port) {
 294                 if (pdata->overcurrent_changed[port]) {
 295                         if (!length)
 296                                 length = 1;
 297                         buf[0] |= 1 << (port + 1);
 298                 }
 299         }
 300
 301         return length;
 302 }
 303
 304 /*
 305  * Look at the control requests to the root hub and see if we need to override.
 306  */
 307 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 308                                  u16 wIndex, char *buf, u16 wLength)
 309 {
 310         struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
 311         struct usb_hub_descriptor *desc;
 312         int ret = -EINVAL;
 313         u32 *data = (u32 *)buf;
 314
 315         dev_dbg(hcd->self.controller,
 316                 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
 317                 hcd, typeReq, wValue, wIndex, buf, wLength);
 318
 319         wIndex--;
 320
 321         switch (typeReq) {
 322         case SetPortFeature:
 323                 if (wValue == USB_PORT_FEAT_POWER) {
 324                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
 325                         if (valid_port(wIndex)) {
 326                                 ohci_at91_usb_set_power(pdata, wIndex, 1);
 327                                 ret = 0;
 328                         }
 329
 330                         goto out;
 331                 }
 332                 break;
 333
 334         case ClearPortFeature:
 335                 switch (wValue) {
 336                 case USB_PORT_FEAT_C_OVER_CURRENT:
 337                         dev_dbg(hcd->self.controller,
 338                                 "ClearPortFeature: C_OVER_CURRENT\n");
 339
 340                         if (valid_port(wIndex)) {
 341                                 pdata->overcurrent_changed[wIndex] = 0;
 342                                 pdata->overcurrent_status[wIndex] = 0;
 343                         }
 344
 345                         goto out;
 346
 347                 case USB_PORT_FEAT_OVER_CURRENT:
 348                         dev_dbg(hcd->self.controller,
 349                                 "ClearPortFeature: OVER_CURRENT\n");
 350
 351                         if (valid_port(wIndex))
 352                                 pdata->overcurrent_status[wIndex] = 0;
 353
 354                         goto out;
 355
 356                 case USB_PORT_FEAT_POWER:
 357                         dev_dbg(hcd->self.controller,
 358                                 "ClearPortFeature: POWER\n");
 359
 360                         if (valid_port(wIndex)) {
 361                                 ohci_at91_usb_set_power(pdata, wIndex, 0);
 362                                 return 0;
 363                         }
 364                 }
 365                 break;
 366         }
 367
 368         ret = orig_ohci_hub_control(hcd, typeReq, wValue, wIndex + 1,
 369                                 buf, wLength);
 370         if (ret)
 371                 goto out;
 372
 373         switch (typeReq) {
 374         case GetHubDescriptor:
 375
 376                 /* update the hub's descriptor */
 377
 378                 desc = (struct usb_hub_descriptor *)buf;
 379
 380                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
 381                         desc->wHubCharacteristics);
 382
 383                 /* remove the old configurations for power-switching, and
 384                  * over-current protection, and insert our new configuration
 385                  */
 386
 387                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
 388                 desc->wHubCharacteristics |= cpu_to_le16(0x0001);
 389
 390                 if (pdata->overcurrent_supported) {
 391                         desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
 392                         desc->wHubCharacteristics |=  cpu_to_le16(0x0008|0x0001);
 393                 }
 394
 395                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
 396                         desc->wHubCharacteristics);
 397
 398                 return ret;
 399
 400         case GetPortStatus:
 401                 /* check port status */
 402
 403                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
 404
 405                 if (valid_port(wIndex)) {
 406                         if (!ohci_at91_usb_get_power(pdata, wIndex))
 407                                 *data &= ~cpu_to_le32(RH_PS_PPS);
 408
 409                         if (pdata->overcurrent_changed[wIndex])
 410                                 *data |= cpu_to_le32(RH_PS_OCIC);
 411
 412                         if (pdata->overcurrent_status[wIndex])
 413                                 *data |= cpu_to_le32(RH_PS_POCI);
 414                 }
 415         }
 416
 417  out:
 418         return ret;
 419 }
 420
 421 /*-------------------------------------------------------------------------*/
 422
 423 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
 424 {
 425         struct platform_device *pdev = data;
 426         struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
 427         int val, gpio, port;
 428
 429         /* From the GPIO notifying the over-current situation, find
 430          * out the corresponding port */
 431         at91_for_each_port(port) {
 432                 if (gpio_is_valid(pdata->overcurrent_pin[port]) &&
 433                                 gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
 434                         gpio = pdata->overcurrent_pin[port];
 435                         break;
 436                 }
 437         }
 438
 439         if (port == AT91_MAX_USBH_PORTS) {
 440                 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
 441                 return IRQ_HANDLED;
 442         }
 443
 444         val = gpio_get_value(gpio);
 445
 446         /* When notified of an over-current situation, disable power
 447            on the corresponding port, and mark this port in
 448            over-current. */
 449         if (!val) {
 450                 ohci_at91_usb_set_power(pdata, port, 0);
 451                 pdata->overcurrent_status[port]  = 1;
 452                 pdata->overcurrent_changed[port] = 1;
 453         }
 454
 455         dev_dbg(& pdev->dev, "overcurrent situation %s\n",
 456                 val ? "exited" : "notified");
 457
 458         return IRQ_HANDLED;
 459 }
 460
 461 #ifdef CONFIG_OF
 462 static const struct of_device_id at91_ohci_dt_ids[] = {
 463         { .compatible = "atmel,at91rm9200-ohci" },
 464         { /* sentinel */ }
 465 };
 466
 467 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
 468
 469 static int ohci_at91_of_init(struct platform_device *pdev)
 470 {
 471         struct device_node *np = pdev->dev.of_node;
 472         int i, gpio, ret;
 473         enum of_gpio_flags flags;
 474         struct at91_usbh_data   *pdata;
 475         u32 ports;
 476
 477         if (!np)
 478                 return 0;
 479
 480         /* Right now device-tree probed devices don't get dma_mask set.
 481          * Since shared usb code relies on it, set it here for now.
 482          * Once we have dma capability bindings this can go away.
 483          */
 484         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 485         if (ret)
 486                 return ret;
 487
 488         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 489         if (!pdata)
 490                 return -ENOMEM;
 491
 492         if (!of_property_read_u32(np, "num-ports", &ports))
 493                 pdata->ports = ports;
 494
 495         at91_for_each_port(i) {
 496                 gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
 497                 pdata->vbus_pin[i] = gpio;
 498                 if (!gpio_is_valid(gpio))
 499                         continue;
 500                 pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
 501         }
 502
 503         at91_for_each_port(i)
 504                 pdata->overcurrent_pin[i] =
 505                         of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
 506
 507         pdev->dev.platform_data = pdata;
 508
 509         return 0;
 510 }
 511 #else
 512 static int ohci_at91_of_init(struct platform_device *pdev)
 513 {
 514         return 0;
 515 }
 516 #endif
 517
 518 /*-------------------------------------------------------------------------*/
 519
 520 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
 521 {
 522         struct at91_usbh_data   *pdata;
 523         int                     i;
 524         int                     gpio;
 525         int                     ret;
 526
 527         ret = ohci_at91_of_init(pdev);
 528         if (ret)
 529                 return ret;
 530
 531         pdata = dev_get_platdata(&pdev->dev);
 532
 533         if (pdata) {
 534                 at91_for_each_port(i) {
 535                         /*
 536                          * do not configure PIO if not in relation with
 537                          * real USB port on board
 538                          */
 539                         if (i >= pdata->ports) {
 540                                 pdata->vbus_pin[i] = -EINVAL;
 541                                 pdata->overcurrent_pin[i] = -EINVAL;
 542                                 break;
 543                         }
 544
 545                         if (!gpio_is_valid(pdata->vbus_pin[i]))
 546                                 continue;
 547                         gpio = pdata->vbus_pin[i];
 548
 549                         ret = gpio_request(gpio, "ohci_vbus");
 550                         if (ret) {
 551                                 dev_err(&pdev->dev,
 552                                         "can't request vbus gpio %d\n", gpio);
 553                                 continue;
 554                         }
 555                         ret = gpio_direction_output(gpio,
 556                                                 !pdata->vbus_pin_active_low[i]);
 557                         if (ret) {
 558                                 dev_err(&pdev->dev,
 559                                         "can't put vbus gpio %d as output %d\n",
 560                                         gpio, !pdata->vbus_pin_active_low[i]);
 561                                 gpio_free(gpio);
 562                                 continue;
 563                         }
 564
 565                         ohci_at91_usb_set_power(pdata, i, 1);
 566                 }
 567
 568                 at91_for_each_port(i) {
 569                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
 570                                 continue;
 571                         gpio = pdata->overcurrent_pin[i];
 572
 573                         ret = gpio_request(gpio, "ohci_overcurrent");
 574                         if (ret) {
 575                                 dev_err(&pdev->dev,
 576                                         "can't request overcurrent gpio %d\n",
 577                                         gpio);
 578                                 continue;
 579                         }
 580
 581                         ret = gpio_direction_input(gpio);
 582                         if (ret) {
 583                                 dev_err(&pdev->dev,
 584                                         "can't configure overcurrent gpio %d as input\n",
 585                                         gpio);
 586                                 gpio_free(gpio);
 587                                 continue;
 588                         }
 589
 590                         ret = request_irq(gpio_to_irq(gpio),
 591                                           ohci_hcd_at91_overcurrent_irq,
 592                                           IRQF_SHARED, "ohci_overcurrent", pdev);
 593                         if (ret) {
 594                                 gpio_free(gpio);
 595                                 dev_err(&pdev->dev,
 596                                         "can't get gpio IRQ for overcurrent\n");
 597                         }
 598                 }
 599         }
 600
 601         device_init_wakeup(&pdev->dev, 1);
 602         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 603 }
 604
 605 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
 606 {
 607         struct at91_usbh_data   *pdata = dev_get_platdata(&pdev->dev);
 608         int                     i;
 609
 610         if (pdata) {
 611                 at91_for_each_port(i) {
 612                         if (!gpio_is_valid(pdata->vbus_pin[i]))
 613                                 continue;
 614                         ohci_at91_usb_set_power(pdata, i, 0);
 615                         gpio_free(pdata->vbus_pin[i]);
 616                 }
 617
 618                 at91_for_each_port(i) {
 619                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
 620                                 continue;
 621                         free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
 622                         gpio_free(pdata->overcurrent_pin[i]);
 623                 }
 624         }
 625
 626         device_init_wakeup(&pdev->dev, 0);
 627         usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
 628         return 0;
 629 }
 630
 631 #ifdef CONFIG_PM
 632
 633 static int
 634 ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
 635 {
 636         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 637         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 638
 639         if (device_may_wakeup(&pdev->dev))
 640                 enable_irq_wake(hcd->irq);
 641
 642         /*
 643          * The integrated transceivers seem unable to notice disconnect,
 644          * reconnect, or wakeup without the 48 MHz clock active.  so for
 645          * correctness, always discard connection state (using reset).
 646          *
 647          * REVISIT: some boards will be able to turn VBUS off...
 648          */
 649         if (at91_suspend_entering_slow_clock()) {
 650                 ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
 651                 ohci->hc_control &= OHCI_CTRL_RWC;
 652                 ohci_writel(ohci, ohci->hc_control, &ohci->regs->control);
 653                 ohci->rh_state = OHCI_RH_HALTED;
 654
 655                 /* flush the writes */
 656                 (void) ohci_readl (ohci, &ohci->regs->control);
 657                 at91_stop_clock();
 658         }
 659
 660         return 0;
 661 }
 662
 663 static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
 664 {
 665         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 666
 667         if (device_may_wakeup(&pdev->dev))
 668                 disable_irq_wake(hcd->irq);
 669
 670         if (!clocked)
 671                 at91_start_clock();
 672
 673         ohci_resume(hcd, false);
 674         return 0;
 675 }
 676 #else
 677 #define ohci_hcd_at91_drv_suspend NULL
 678 #define ohci_hcd_at91_drv_resume  NULL
 679 #endif
 680
 681 static struct platform_driver ohci_hcd_at91_driver = {
 682         .probe          = ohci_hcd_at91_drv_probe,
 683         .remove         = ohci_hcd_at91_drv_remove,
 684         .shutdown       = usb_hcd_platform_shutdown,
 685         .suspend        = ohci_hcd_at91_drv_suspend,
 686         .resume         = ohci_hcd_at91_drv_resume,
 687         .driver         = {
 688                 .name   = "at91_ohci",
 689                 .owner  = THIS_MODULE,
 690                 .of_match_table = of_match_ptr(at91_ohci_dt_ids),
 691         },
 692 };
 693
 694 static int __init ohci_at91_init(void)
 695 {
 696         if (usb_disabled())
 697                 return -ENODEV;
 698
 699         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 700         ohci_init_driver(&ohci_at91_hc_driver, NULL);
 701
 702         /*
 703          * The Atmel HW has some unusual quirks, which require Atmel-specific
 704          * workarounds. We override certain hc_driver functions here to
 705          * achieve that. We explicitly do not enhance ohci_driver_overrides to
 706          * allow this more easily, since this is an unusual case, and we don't
 707          * want to encourage others to override these functions by making it
 708          * too easy.
 709          */
 710
 711         orig_ohci_hub_control = ohci_at91_hc_driver.hub_control;
 712         orig_ohci_hub_status_data = ohci_at91_hc_driver.hub_status_data;
 713
 714         ohci_at91_hc_driver.hub_status_data     = ohci_at91_hub_status_data;
 715         ohci_at91_hc_driver.hub_control         = ohci_at91_hub_control;
 716
 717         return platform_driver_register(&ohci_hcd_at91_driver);
 718 }
 719 module_init(ohci_at91_init);
 720
 721 static void __exit ohci_at91_cleanup(void)
 722 {
 723         platform_driver_unregister(&ohci_hcd_at91_driver);
 724 }
 725 module_exit(ohci_at91_cleanup);
 726
 727 MODULE_DESCRIPTION(DRIVER_DESC);
 728 MODULE_LICENSE("GPL");
 729 MODULE_ALIAS("platform:at91_ohci");