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 <varenet@parisc-linux.org>
   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_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_dbg(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], 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         return gpiod_get_value(pdata->vbus_pin[port]);
 278 }
 279
 280 /*
 281  * Update the status data from the hub with the over-current indicator change.
 282  */
 283 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
 284 {
 285         struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
 286         int length = ohci_hub_status_data(hcd, buf);
 287         int port;
 288
 289         at91_for_each_port(port) {
 290                 if (pdata->overcurrent_changed[port]) {
 291                         if (!length)
 292                                 length = 1;
 293                         buf[0] |= 1 << (port + 1);
 294                 }
 295         }
 296
 297         return length;
 298 }
 299
 300 static int ohci_at91_port_suspend(struct regmap *regmap, u8 set)
 301 {
 302         u32 regval;
 303         int ret;
 304
 305         if (!regmap)
 306                 return 0;
 307
 308         ret = regmap_read(regmap, AT91_SFR_OHCIICR, &regval);
 309         if (ret)
 310                 return ret;
 311
 312         if (set)
 313                 regval |= AT91_OHCIICR_USB_SUSPEND;
 314         else
 315                 regval &= ~AT91_OHCIICR_USB_SUSPEND;
 316
 317         regmap_write(regmap, AT91_SFR_OHCIICR, regval);
 318
 319         return 0;
 320 }
 321
 322 /*
 323  * Look at the control requests to the root hub and see if we need to override.
 324  */
 325 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 326                                  u16 wIndex, char *buf, u16 wLength)
 327 {
 328         struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
 329         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
 330         struct usb_hub_descriptor *desc;
 331         int ret = -EINVAL;
 332         u32 *data = (u32 *)buf;
 333
 334         dev_dbg(hcd->self.controller,
 335                 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
 336                 hcd, typeReq, wValue, wIndex, buf, wLength);
 337
 338         wIndex--;
 339
 340         switch (typeReq) {
 341         case SetPortFeature:
 342                 switch (wValue) {
 343                 case USB_PORT_FEAT_POWER:
 344                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
 345                         if (valid_port(wIndex)) {
 346                                 ohci_at91_usb_set_power(pdata, wIndex, 1);
 347                                 ret = 0;
 348                         }
 349
 350                         goto out;
 351
 352                 case USB_PORT_FEAT_SUSPEND:
 353                         dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n");
 354                         if (valid_port(wIndex) && ohci_at91->sfr_regmap) {
 355                                 ohci_at91_port_suspend(ohci_at91->sfr_regmap,
 356                                                        1);
 357                                 return 0;
 358                         }
 359                         break;
 360                 }
 361                 break;
 362
 363         case ClearPortFeature:
 364                 switch (wValue) {
 365                 case USB_PORT_FEAT_C_OVER_CURRENT:
 366                         dev_dbg(hcd->self.controller,
 367                                 "ClearPortFeature: C_OVER_CURRENT\n");
 368
 369                         if (valid_port(wIndex)) {
 370                                 pdata->overcurrent_changed[wIndex] = 0;
 371                                 pdata->overcurrent_status[wIndex] = 0;
 372                         }
 373
 374                         goto out;
 375
 376                 case USB_PORT_FEAT_OVER_CURRENT:
 377                         dev_dbg(hcd->self.controller,
 378                                 "ClearPortFeature: OVER_CURRENT\n");
 379
 380                         if (valid_port(wIndex))
 381                                 pdata->overcurrent_status[wIndex] = 0;
 382
 383                         goto out;
 384
 385                 case USB_PORT_FEAT_POWER:
 386                         dev_dbg(hcd->self.controller,
 387                                 "ClearPortFeature: POWER\n");
 388
 389                         if (valid_port(wIndex)) {
 390                                 ohci_at91_usb_set_power(pdata, wIndex, 0);
 391                                 return 0;
 392                         }
 393                         break;
 394
 395                 case USB_PORT_FEAT_SUSPEND:
 396                         dev_dbg(hcd->self.controller, "ClearPortFeature: SUSPEND\n");
 397                         if (valid_port(wIndex) && ohci_at91->sfr_regmap) {
 398                                 ohci_at91_port_suspend(ohci_at91->sfr_regmap,
 399                                                        0);
 400                                 return 0;
 401                         }
 402                         break;
 403                 }
 404                 break;
 405         }
 406
 407         ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
 408         if (ret)
 409                 goto out;
 410
 411         switch (typeReq) {
 412         case GetHubDescriptor:
 413
 414                 /* update the hub's descriptor */
 415
 416                 desc = (struct usb_hub_descriptor *)buf;
 417
 418                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
 419                         desc->wHubCharacteristics);
 420
 421                 /* remove the old configurations for power-switching, and
 422                  * over-current protection, and insert our new configuration
 423                  */
 424
 425                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
 426                 desc->wHubCharacteristics |=
 427                         cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM);
 428
 429                 if (pdata->overcurrent_supported) {
 430                         desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
 431                         desc->wHubCharacteristics |=
 432                                 cpu_to_le16(HUB_CHAR_INDV_PORT_OCPM);
 433                 }
 434
 435                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
 436                         desc->wHubCharacteristics);
 437
 438                 return ret;
 439
 440         case GetPortStatus:
 441                 /* check port status */
 442
 443                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
 444
 445                 if (valid_port(wIndex)) {
 446                         if (!ohci_at91_usb_get_power(pdata, wIndex))
 447                                 *data &= ~cpu_to_le32(RH_PS_PPS);
 448
 449                         if (pdata->overcurrent_changed[wIndex])
 450                                 *data |= cpu_to_le32(RH_PS_OCIC);
 451
 452                         if (pdata->overcurrent_status[wIndex])
 453                                 *data |= cpu_to_le32(RH_PS_POCI);
 454                 }
 455         }
 456
 457  out:
 458         return ret;
 459 }
 460
 461 /*-------------------------------------------------------------------------*/
 462
 463 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
 464 {
 465         struct platform_device *pdev = data;
 466         struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
 467         int val, port;
 468
 469         /* From the GPIO notifying the over-current situation, find
 470          * out the corresponding port */
 471         at91_for_each_port(port) {
 472                 if (gpiod_to_irq(pdata->overcurrent_pin[port]) == irq)
 473                         break;
 474         }
 475
 476         if (port == AT91_MAX_USBH_PORTS) {
 477                 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
 478                 return IRQ_HANDLED;
 479         }
 480
 481         val = gpiod_get_value(pdata->overcurrent_pin[port]);
 482
 483         /* When notified of an over-current situation, disable power
 484            on the corresponding port, and mark this port in
 485            over-current. */
 486         if (!val) {
 487                 ohci_at91_usb_set_power(pdata, port, 0);
 488                 pdata->overcurrent_status[port]  = 1;
 489                 pdata->overcurrent_changed[port] = 1;
 490         }
 491
 492         dev_dbg(& pdev->dev, "overcurrent situation %s\n",
 493                 val ? "exited" : "notified");
 494
 495         return IRQ_HANDLED;
 496 }
 497
 498 static const struct of_device_id at91_ohci_dt_ids[] = {
 499         { .compatible = "atmel,at91rm9200-ohci" },
 500         { /* sentinel */ }
 501 };
 502
 503 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
 504
 505 /*-------------------------------------------------------------------------*/
 506
 507 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
 508 {
 509         struct device_node *np = pdev->dev.of_node;
 510         struct at91_usbh_data   *pdata;
 511         int                     i;
 512         int                     ret;
 513         int                     err;
 514         u32                     ports;
 515
 516         /* Right now device-tree probed devices don't get dma_mask set.
 517          * Since shared usb code relies on it, set it here for now.
 518          * Once we have dma capability bindings this can go away.
 519          */
 520         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 521         if (ret)
 522                 return ret;
 523
 524         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 525         if (!pdata)
 526                 return -ENOMEM;
 527
 528         pdev->dev.platform_data = pdata;
 529
 530         if (!of_property_read_u32(np, "num-ports", &ports))
 531                 pdata->ports = ports;
 532
 533         at91_for_each_port(i) {
 534                 if (i >= pdata->ports)
 535                         break;
 536
 537                 pdata->vbus_pin[i] =
 538                         devm_gpiod_get_index_optional(&pdev->dev, "atmel,vbus",
 539                                                       i, GPIOD_OUT_HIGH);
 540                 if (IS_ERR(pdata->vbus_pin[i])) {
 541                         err = PTR_ERR(pdata->vbus_pin[i]);
 542                         dev_err(&pdev->dev, "unable to claim gpio \"vbus\": %d\n", err);
 543                         continue;
 544                 }
 545         }
 546
 547         at91_for_each_port(i) {
 548                 if (i >= pdata->ports)
 549                         break;
 550
 551                 pdata->overcurrent_pin[i] =
 552                         devm_gpiod_get_index_optional(&pdev->dev, "atmel,oc",
 553                                                       i, GPIOD_IN);
 554                 if (!pdata->overcurrent_pin[i])
 555                         continue;
 556                 if (IS_ERR(pdata->overcurrent_pin[i])) {
 557                         err = PTR_ERR(pdata->overcurrent_pin[i]);
 558                         dev_err(&pdev->dev, "unable to claim gpio \"overcurrent\": %d\n", err);
 559                         continue;
 560                 }
 561
 562                 ret = devm_request_irq(&pdev->dev,
 563                                        gpiod_to_irq(pdata->overcurrent_pin[i]),
 564                                        ohci_hcd_at91_overcurrent_irq,
 565                                        IRQF_SHARED,
 566                                        "ohci_overcurrent", pdev);
 567                 if (ret)
 568                         dev_info(&pdev->dev, "failed to request gpio \"overcurrent\" IRQ\n");
 569         }
 570
 571         device_init_wakeup(&pdev->dev, 1);
 572         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 573 }
 574
 575 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
 576 {
 577         struct at91_usbh_data   *pdata = dev_get_platdata(&pdev->dev);
 578         int                     i;
 579
 580         if (pdata) {
 581                 at91_for_each_port(i)
 582                         ohci_at91_usb_set_power(pdata, i, 0);
 583         }
 584
 585         device_init_wakeup(&pdev->dev, 0);
 586         usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
 587         return 0;
 588 }
 589
 590 static int __maybe_unused
 591 ohci_hcd_at91_drv_suspend(struct device *dev)
 592 {
 593         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 594         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 595         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
 596         int             ret;
 597
 598         /*
 599          * Disable wakeup if we are going to sleep with slow clock mode
 600          * enabled.
 601          */
 602         ohci_at91->wakeup = device_may_wakeup(dev)
 603                         && !at91_suspend_entering_slow_clock();
 604
 605         if (ohci_at91->wakeup)
 606                 enable_irq_wake(hcd->irq);
 607
 608         ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1);
 609
 610         ret = ohci_suspend(hcd, ohci_at91->wakeup);
 611         if (ret) {
 612                 if (ohci_at91->wakeup)
 613                         disable_irq_wake(hcd->irq);
 614                 return ret;
 615         }
 616         /*
 617          * The integrated transceivers seem unable to notice disconnect,
 618          * reconnect, or wakeup without the 48 MHz clock active.  so for
 619          * correctness, always discard connection state (using reset).
 620          *
 621          * REVISIT: some boards will be able to turn VBUS off...
 622          */
 623         if (!ohci_at91->wakeup) {
 624                 ohci->rh_state = OHCI_RH_HALTED;
 625
 626                 /* flush the writes */
 627                 (void) ohci_readl (ohci, &ohci->regs->control);
 628                 at91_stop_clock(ohci_at91);
 629         }
 630
 631         return ret;
 632 }
 633
 634 static int __maybe_unused
 635 ohci_hcd_at91_drv_resume(struct device *dev)
 636 {
 637         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 638         struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
 639
 640         if (ohci_at91->wakeup)
 641                 disable_irq_wake(hcd->irq);
 642
 643         at91_start_clock(ohci_at91);
 644
 645         ohci_resume(hcd, false);
 646
 647         ohci_at91_port_suspend(ohci_at91->sfr_regmap, 0);
 648
 649         return 0;
 650 }
 651
 652 static SIMPLE_DEV_PM_OPS(ohci_hcd_at91_pm_ops, ohci_hcd_at91_drv_suspend,
 653                                         ohci_hcd_at91_drv_resume);
 654
 655 static struct platform_driver ohci_hcd_at91_driver = {
 656         .probe          = ohci_hcd_at91_drv_probe,
 657         .remove         = ohci_hcd_at91_drv_remove,
 658         .shutdown       = usb_hcd_platform_shutdown,
 659         .driver         = {
 660                 .name   = "at91_ohci",
 661                 .pm     = &ohci_hcd_at91_pm_ops,
 662                 .of_match_table = at91_ohci_dt_ids,
 663         },
 664 };
 665
 666 static int __init ohci_at91_init(void)
 667 {
 668         if (usb_disabled())
 669                 return -ENODEV;
 670
 671         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 672         ohci_init_driver(&ohci_at91_hc_driver, &ohci_at91_drv_overrides);
 673
 674         /*
 675          * The Atmel HW has some unusual quirks, which require Atmel-specific
 676          * workarounds. We override certain hc_driver functions here to
 677          * achieve that. We explicitly do not enhance ohci_driver_overrides to
 678          * allow this more easily, since this is an unusual case, and we don't
 679          * want to encourage others to override these functions by making it
 680          * too easy.
 681          */
 682
 683         ohci_at91_hc_driver.hub_status_data     = ohci_at91_hub_status_data;
 684         ohci_at91_hc_driver.hub_control         = ohci_at91_hub_control;
 685
 686         return platform_driver_register(&ohci_hcd_at91_driver);
 687 }
 688 module_init(ohci_at91_init);
 689
 690 static void __exit ohci_at91_cleanup(void)
 691 {
 692         platform_driver_unregister(&ohci_hcd_at91_driver);
 693 }
 694 module_exit(ohci_at91_cleanup);
 695
 696 MODULE_DESCRIPTION(DRIVER_DESC);
 697 MODULE_LICENSE("GPL");
 698 MODULE_ALIAS("platform:at91_ohci");