drivers/usb/host/ohci-at91.c

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

DEFINITIONS
