drivers/usb/host/ohci-at91.c

   1 // SPDX-License-Identifier: GPL-1.0+
   2 /*
   3  * OHCI HCD (Host Controller Driver) for USB.
   4  *
   5  *  Copyright (C) 2004 SAN People (Pty) Ltd.
   6  *  Copyright (C) 2005 Thibaut VARENE <[email protected]>
   7  *
   8  * AT91 Bus Glue
   9  *
  10  * Based on fragments of 2.4 driver by Rick Bronson.
  11  * Based on ohci-omap.c
  12  *
  13  * This file is licenced under the GPL.
  14  */
  15
  16 #include <linux/clk.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/gpio/consumer.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/platform_data/atmel.h>
  22 #include <linux/io.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/mfd/syscon.h>
  26 #include <linux/regmap.h>
  27 #include <linux/usb.h>
  28 #include <linux/usb/hcd.h>
  29 #include <soc/at91/atmel-sfr.h>
  30
  31 #include "ohci.h"
  32
  33 #define valid_port(index)       ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
  34 #define at91_for_each_port(index)       \
  35                 for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
  36
  37 /* interface, function and usb clocks; sometimes also an AHB clock */
  38 #define hcd_to_ohci_at91_priv(h) \
  39         ((struct ohci_at91_priv *)hcd_to_ohci(h)->priv)
  40
  41 #define AT91_MAX_USBH_PORTS     3
  42 struct at91_usbh_data {
  43         struct gpio_desc *vbus_pin[AT91_MAX_USBH_PORTS];
  44         struct gpio_desc *overcurrent_pin[AT91_MAX_USBH_PORTS];
  45         u8 ports;                               /* number of ports on root hub */
  46         u8 overcurrent_supported;
  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_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         usb_hcd_platform_shutdown(pdev);
 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 = syscon_regmap_lookup_by_compatible("microchip,sam9x60-sfr");
 145                 if (IS_ERR(regmap))
 146                         regmap = NULL;
 147         }
 148
 149         return regmap;
 150 }
 151
 152 /* configure so an HC device and id are always provided */
 153 /* always called with process context; sleeping is OK */
 154
 155
 156 /*
 157  * usb_hcd_at91_probe - initialize AT91-based HCDs
 158  * @driver:     Pointer to hc driver instance
 159  * @pdev:       USB controller to probe
 160  *
 161  * Context: task context, might sleep
 162  *
 163  * Allocates basic resources for this USB host controller, and
 164  * then invokes the start() method for the HCD associated with it
 165  * through the hotplug entry's driver_data.
 166  */
 167 static int usb_hcd_at91_probe(const struct hc_driver *driver,
 168                         struct platform_device *pdev)
 169 {
 170         struct at91_usbh_data *board;
 171         struct ohci_hcd *ohci;
 172         int retval;
 173         struct usb_hcd *hcd;
 174         struct ohci_at91_priv *ohci_at91;
 175         struct device *dev = &pdev->dev;
 176         struct resource *res;
 177         int irq;
 178
 179         irq = platform_get_irq(pdev, 0);
 180         if (irq < 0) {
 181                 dev_dbg(dev, "hcd probe: missing irq resource\n");
 182                 return irq;
 183         }
 184
 185         hcd = usb_create_hcd(driver, dev, "at91");
 186         if (!hcd)
 187                 return -ENOMEM;
 188         ohci_at91 = hcd_to_ohci_at91_priv(hcd);
 189
 190         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 191         hcd->regs = devm_ioremap_resource(dev, res);
 192         if (IS_ERR(hcd->regs)) {
 193                 retval = PTR_ERR(hcd->regs);
 194                 goto err;
 195         }
 196         hcd->rsrc_start = res->start;
 197         hcd->rsrc_len = resource_size(res);
 198
 199         ohci_at91->iclk = devm_clk_get(dev, "ohci_clk");
 200         if (IS_ERR(ohci_at91->iclk)) {
 201                 dev_err(dev, "failed to get ohci_clk\n");
 202                 retval = PTR_ERR(ohci_at91->iclk);
 203                 goto err;
 204         }
 205         ohci_at91->fclk = devm_clk_get(dev, "uhpck");
 206         if (IS_ERR(ohci_at91->fclk)) {
 207                 dev_err(dev, "failed to get uhpck\n");
 208                 retval = PTR_ERR(ohci_at91->fclk);
 209                 goto err;
 210         }
 211         ohci_at91->hclk = devm_clk_get(dev, "hclk");
 212         if (IS_ERR(ohci_at91->hclk)) {
 213                 dev_err(dev, "failed to get hclk\n");
 214                 retval = PTR_ERR(ohci_at91->hclk);
 215                 goto err;
 216         }
 217
 218         ohci_at91->sfr_regmap = at91_dt_syscon_sfr();
 219         if (!ohci_at91->sfr_regmap)
 220                 dev_dbg(dev, "failed to find sfr node\n");
 221
 222         board = hcd->self.controller->platform_data;
 223         ohci = hcd_to_ohci(hcd);
 224         ohci->num_ports = board->ports;
 225         at91_start_hc(pdev);
 226
 227         /*
 228          * The RemoteWakeupConnected bit has to be set explicitly
 229          * before calling ohci_run. The reset value of this bit is 0.
 230          */
 231         ohci->hc_control = OHCI_CTRL_RWC;
 232
 233         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 234         if (retval == 0) {
 235                 device_wakeup_enable(hcd->self.controller);
 236                 return retval;
 237         }
 238
 239         /* Error handling */
 240         at91_stop_hc(pdev);
 241
 242  err:
 243         usb_put_hcd(hcd);
 244         return retval;
 245 }
 246
 247
 248 /* may be called with controller, bus, and devices active */
 249
 250 /*
 251  * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
 252  * @hcd:        USB controller to remove
 253  * @pdev:       Platform device required for cleanup
 254  *
 255  * Context: task context, might sleep
 256  *
 257  * Reverses the effect of usb_hcd_at91_probe(), first invoking
 258  * the HCD's stop() method.  It is always called from a thread
 259  * context, "rmmod" or something similar.
 260  */
 261 static void usb_hcd_at91_remove(struct usb_hcd *hcd,
 262                                 struct platform_device *pdev)
 263 {
 264         usb_remove_hcd(hcd);
 265         at91_stop_hc(pdev);
 266         usb_put_hcd(hcd);
 267 }
 268
 269 /*-------------------------------------------------------------------------*/
 270 static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
 271 {
 272         if (!valid_port(port))
 273                 return;
 274
 275         gpiod_set_value(pdata->vbus_pin[port], enable);
 276 }
 277
 278 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
 279 {
 280         if (!valid_port(port))
 281                 return -EINVAL;
 282
 283         return gpiod_get_value(pdata->vbus_pin[port]);
 284 }
 285
 286 /*
 287  * Update the status data from the hub with the over-current indicator change.
 288  */
 289 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
 290 {
 291         struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
 292         int length = ohci_hub_status_data(hcd, buf);
 293         int port;
 294
 295         at91_for_each_port(port) {
 296                 if (pdata->overcurrent_changed[port]) {
 297                         if (!length)
 298                                 length = 1;
 299                         buf[0] |= 1 << (port + 1);
 300                 }
 301         }
 302
 303         return length;
 304 }
 305
 306 static int ohci_at91_port_suspend(struct regmap *regmap, u8 set)
 307 {
 308         u32 regval;
 309         int ret;
 310
 311         if (!regmap)
 312                 return 0;
 313
 314         ret = regmap_read(regmap, AT91_SFR_OHCIICR, &regval);
 315         if (ret)
 316                 return ret;
 317
 318         if (set)
 319                 regval |= AT91_OHCIICR_USB_SUSPEND;
 320         else
 321                 regval &= ~AT91_OHCIICR_USB_SUSPEND;
 322
 323         regmap_write(regmap, AT91_SFR_OHCIICR, regval);
 324
 325         return 0;
 326 }
 327
 328 /*
 329  * Look at the control requests to the root hub and see if we need to override.
 330  */
 331 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 332                                  u16 wIndex, char *buf, u16 wLength)
 333 {
 334         struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
 335         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
 336         struct usb_hub_descriptor *desc;
 337         int ret = -EINVAL;
 338         u32 *data = (u32 *)buf;
 339
 340         dev_dbg(hcd->self.controller,
 341                 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
 342                 hcd, typeReq, wValue, wIndex, buf, wLength);
 343
 344         wIndex--;
 345
 346         switch (typeReq) {
 347         case SetPortFeature:
 348                 switch (wValue) {
 349                 case USB_PORT_FEAT_POWER:
 350                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
 351                         if (valid_port(wIndex)) {
 352                                 ohci_at91_usb_set_power(pdata, wIndex, 1);
 353                                 ret = 0;
 354                         }
 355
 356                         goto out;
 357
 358                 case USB_PORT_FEAT_SUSPEND:
 359                         dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n");
 360                         if (valid_port(wIndex) && ohci_at91->sfr_regmap) {
 361                                 ohci_at91_port_suspend(ohci_at91->sfr_regmap,
 362                                                        1);
 363                                 return 0;
 364                         }
 365                         break;
 366                 }
 367                 break;
 368
 369         case ClearPortFeature:
 370                 switch (wValue) {
 371                 case USB_PORT_FEAT_C_OVER_CURRENT:
 372                         dev_dbg(hcd->self.controller,
 373                                 "ClearPortFeature: C_OVER_CURRENT\n");
 374
 375                         if (valid_port(wIndex)) {
 376                                 pdata->overcurrent_changed[wIndex] = 0;
 377                                 pdata->overcurrent_status[wIndex] = 0;
 378                         }
 379
 380                         goto out;
 381
 382                 case USB_PORT_FEAT_OVER_CURRENT:
 383                         dev_dbg(hcd->self.controller,
 384                                 "ClearPortFeature: OVER_CURRENT\n");
 385
 386                         if (valid_port(wIndex))
 387                                 pdata->overcurrent_status[wIndex] = 0;
 388
 389                         goto out;
 390
 391                 case USB_PORT_FEAT_POWER:
 392                         dev_dbg(hcd->self.controller,
 393                                 "ClearPortFeature: POWER\n");
 394
 395                         if (valid_port(wIndex)) {
 396                                 ohci_at91_usb_set_power(pdata, wIndex, 0);
 397                                 return 0;
 398                         }
 399                         break;
 400
 401                 case USB_PORT_FEAT_SUSPEND:
 402                         dev_dbg(hcd->self.controller, "ClearPortFeature: SUSPEND\n");
 403                         if (valid_port(wIndex) && ohci_at91->sfr_regmap) {
 404                                 ohci_at91_port_suspend(ohci_at91->sfr_regmap,
 405                                                        0);
 406                                 return 0;
 407                         }
 408                         break;
 409                 }
 410                 break;
 411         }
 412
 413         ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
 414         if (ret)
 415                 goto out;
 416
 417         switch (typeReq) {
 418         case GetHubDescriptor:
 419
 420                 /* update the hub's descriptor */
 421
 422                 desc = (struct usb_hub_descriptor *)buf;
 423
 424                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
 425                         desc->wHubCharacteristics);
 426
 427                 /* remove the old configurations for power-switching, and
 428                  * over-current protection, and insert our new configuration
 429                  */
 430
 431                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
 432                 desc->wHubCharacteristics |=
 433                         cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM);
 434
 435                 if (pdata->overcurrent_supported) {
 436                         desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
 437                         desc->wHubCharacteristics |=
 438                                 cpu_to_le16(HUB_CHAR_INDV_PORT_OCPM);
 439                 }
 440
 441                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
 442                         desc->wHubCharacteristics);
 443
 444                 return ret;
 445
 446         case GetPortStatus:
 447                 /* check port status */
 448
 449                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
 450
 451                 if (valid_port(wIndex)) {
 452                         if (!ohci_at91_usb_get_power(pdata, wIndex))
 453                                 *data &= ~cpu_to_le32(RH_PS_PPS);
 454
 455                         if (pdata->overcurrent_changed[wIndex])
 456                                 *data |= cpu_to_le32(RH_PS_OCIC);
 457
 458                         if (pdata->overcurrent_status[wIndex])
 459                                 *data |= cpu_to_le32(RH_PS_POCI);
 460                 }
 461         }
 462
 463  out:
 464         return ret;
 465 }
 466
 467 /*-------------------------------------------------------------------------*/
 468
 469 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
 470 {
 471         struct platform_device *pdev = data;
 472         struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
 473         int val, port;
 474
 475         /* From the GPIO notifying the over-current situation, find
 476          * out the corresponding port */
 477         at91_for_each_port(port) {
 478                 if (gpiod_to_irq(pdata->overcurrent_pin[port]) == irq)
 479                         break;
 480         }
 481
 482         if (port == AT91_MAX_USBH_PORTS) {
 483                 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
 484                 return IRQ_HANDLED;
 485         }
 486
 487         val = gpiod_get_value(pdata->overcurrent_pin[port]);
 488
 489         /* When notified of an over-current situation, disable power
 490            on the corresponding port, and mark this port in
 491            over-current. */
 492         if (!val) {
 493                 ohci_at91_usb_set_power(pdata, port, 0);
 494                 pdata->overcurrent_status[port]  = 1;
 495                 pdata->overcurrent_changed[port] = 1;
 496         }
 497
 498         dev_dbg(& pdev->dev, "overcurrent situation %s\n",
 499                 val ? "exited" : "notified");
 500
 501         return IRQ_HANDLED;
 502 }
 503
 504 static const struct of_device_id at91_ohci_dt_ids[] = {
 505         { .compatible = "atmel,at91rm9200-ohci" },
 506         { /* sentinel */ }
 507 };
 508
 509 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
 510
 511 /*-------------------------------------------------------------------------*/
 512
 513 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
 514 {
 515         struct device_node *np = pdev->dev.of_node;
 516         struct at91_usbh_data   *pdata;
 517         int                     i;
 518         int                     ret;
 519         int                     err;
 520         u32                     ports;
 521
 522         /* Right now device-tree probed devices don't get dma_mask set.
 523          * Since shared usb code relies on it, set it here for now.
 524          * Once we have dma capability bindings this can go away.
 525          */
 526         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 527         if (ret)
 528                 return ret;
 529
 530         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 531         if (!pdata)
 532                 return -ENOMEM;
 533
 534         pdev->dev.platform_data = pdata;
 535
 536         if (!of_property_read_u32(np, "num-ports", &ports))
 537                 pdata->ports = ports;
 538
 539         at91_for_each_port(i) {
 540                 if (i >= pdata->ports)
 541                         break;
 542
 543                 pdata->vbus_pin[i] =
 544                         devm_gpiod_get_index_optional(&pdev->dev, "atmel,vbus",
 545                                                       i, GPIOD_OUT_HIGH);
 546                 if (IS_ERR(pdata->vbus_pin[i])) {
 547                         err = PTR_ERR(pdata->vbus_pin[i]);
 548                         dev_err(&pdev->dev, "unable to claim gpio \"vbus\": %d\n", err);
 549                         continue;
 550                 }
 551         }
 552
 553         at91_for_each_port(i) {
 554                 if (i >= pdata->ports)
 555                         break;
 556
 557                 pdata->overcurrent_pin[i] =
 558                         devm_gpiod_get_index_optional(&pdev->dev, "atmel,oc",
 559                                                       i, GPIOD_IN);
 560                 if (!pdata->overcurrent_pin[i])
 561                         continue;
 562                 if (IS_ERR(pdata->overcurrent_pin[i])) {
 563                         err = PTR_ERR(pdata->overcurrent_pin[i]);
 564                         dev_err(&pdev->dev, "unable to claim gpio \"overcurrent\": %d\n", err);
 565                         continue;
 566                 }
 567
 568                 ret = devm_request_irq(&pdev->dev,
 569                                        gpiod_to_irq(pdata->overcurrent_pin[i]),
 570                                        ohci_hcd_at91_overcurrent_irq,
 571                                        IRQF_SHARED,
 572                                        "ohci_overcurrent", pdev);
 573                 if (ret)
 574                         dev_info(&pdev->dev, "failed to request gpio \"overcurrent\" IRQ\n");
 575         }
 576
 577         device_init_wakeup(&pdev->dev, 1);
 578         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 579 }
 580
 581 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
 582 {
 583         struct at91_usbh_data   *pdata = dev_get_platdata(&pdev->dev);
 584         int                     i;
 585
 586         if (pdata) {
 587                 at91_for_each_port(i)
 588                         ohci_at91_usb_set_power(pdata, i, 0);
 589         }
 590
 591         device_init_wakeup(&pdev->dev, 0);
 592         usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
 593         return 0;
 594 }
 595
 596 static int __maybe_unused
 597 ohci_hcd_at91_drv_suspend(struct device *dev)
 598 {
 599         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 600         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 601         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
 602         int             ret;
 603
 604         /*
 605          * Disable wakeup if we are going to sleep with slow clock mode
 606          * enabled.
 607          */
 608         ohci_at91->wakeup = device_may_wakeup(dev)
 609                         && !at91_suspend_entering_slow_clock();
 610
 611         if (ohci_at91->wakeup)
 612                 enable_irq_wake(hcd->irq);
 613
 614         ret = ohci_suspend(hcd, ohci_at91->wakeup);
 615         if (ret) {
 616                 if (ohci_at91->wakeup)
 617                         disable_irq_wake(hcd->irq);
 618                 return ret;
 619         }
 620         /*
 621          * The integrated transceivers seem unable to notice disconnect,
 622          * reconnect, or wakeup without the 48 MHz clock active.  so for
 623          * correctness, always discard connection state (using reset).
 624          *
 625          * REVISIT: some boards will be able to turn VBUS off...
 626          */
 627         if (!ohci_at91->wakeup) {
 628                 ohci->rh_state = OHCI_RH_HALTED;
 629
 630                 /* flush the writes */
 631                 (void) ohci_readl (ohci, &ohci->regs->control);
 632                 msleep(1);
 633                 ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1);
 634                 at91_stop_clock(ohci_at91);
 635         } else {
 636                 ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1);
 637         }
 638
 639         return ret;
 640 }
 641
 642 static int __maybe_unused
 643 ohci_hcd_at91_drv_resume(struct device *dev)
 644 {
 645         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 646         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
 647
 648         ohci_at91_port_suspend(ohci_at91->sfr_regmap, 0);
 649
 650         if (ohci_at91->wakeup)
 651                 disable_irq_wake(hcd->irq);
 652         else
 653                 at91_start_clock(ohci_at91);
 654
 655         ohci_resume(hcd, false);
 656
 657         return 0;
 658 }
 659
 660 static SIMPLE_DEV_PM_OPS(ohci_hcd_at91_pm_ops, ohci_hcd_at91_drv_suspend,
 661                                         ohci_hcd_at91_drv_resume);
 662
 663 static struct platform_driver ohci_hcd_at91_driver = {
 664         .probe          = ohci_hcd_at91_drv_probe,
 665         .remove         = ohci_hcd_at91_drv_remove,
 666         .shutdown       = usb_hcd_platform_shutdown,
 667         .driver         = {
 668                 .name   = "at91_ohci",
 669                 .pm     = &ohci_hcd_at91_pm_ops,
 670                 .of_match_table = at91_ohci_dt_ids,
 671         },
 672 };
 673
 674 static int __init ohci_at91_init(void)
 675 {
 676         if (usb_disabled())
 677                 return -ENODEV;
 678
 679         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 680         ohci_init_driver(&ohci_at91_hc_driver, &ohci_at91_drv_overrides);
 681
 682         /*
 683          * The Atmel HW has some unusual quirks, which require Atmel-specific
 684          * workarounds. We override certain hc_driver functions here to
 685          * achieve that. We explicitly do not enhance ohci_driver_overrides to
 686          * allow this more easily, since this is an unusual case, and we don't
 687          * want to encourage others to override these functions by making it
 688          * too easy.
 689          */
 690
 691         ohci_at91_hc_driver.hub_status_data     = ohci_at91_hub_status_data;
 692         ohci_at91_hc_driver.hub_control         = ohci_at91_hub_control;
 693
 694         return platform_driver_register(&ohci_hcd_at91_driver);
 695 }
 696 module_init(ohci_at91_init);
 697
 698 static void __exit ohci_at91_cleanup(void)
 699 {
 700         platform_driver_unregister(&ohci_hcd_at91_driver);
 701 }
 702 module_exit(ohci_at91_cleanup);
 703
 704 MODULE_DESCRIPTION(DRIVER_DESC);
 705 MODULE_LICENSE("GPL");
 706 MODULE_ALIAS("platform:at91_ohci");