static int xhci_dwc_drv_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct usb_phy *usb_phy;
	struct xhci_hcd *xhci = hcd_to_xhci(hcd);

	usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
	otg_set_host(usb_phy->otg, NULL);
	usb_put_phy(usb_phy);

	if (xhci)
		dwc3_stop_host(hcd);
	usb_put_hcd(hcd);

	pm_runtime_disable(hcd->self.controller);
	pm_runtime_set_suspended(hcd->self.controller);
	wake_lock_destroy(&dwc3_xhci.wakelock);
	return 0;
}

/**
 * ohci_hcd_omap_remove - shutdown processing for OMAP-based HCDs
 * @dev: USB Host Controller being removed
 * Context: !in_interrupt()
 *
 * Reverses the effect of ohci_hcd_omap_probe(), first invoking
 * the HCD's stop() method.  It is always called from a thread
 * context, normally "rmmod", "apmd", or something similar.
 */
static int ohci_hcd_omap_remove(struct platform_device *pdev)
{
	struct usb_hcd	*hcd = platform_get_drvdata(pdev);

	dev_dbg(hcd->self.controller, "stopping USB Controller\n");
	usb_remove_hcd(hcd);
	omap_ohci_clock_power(0);
	if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
		(void) otg_set_host(hcd->usb_phy->otg, 0);
		usb_put_phy(hcd->usb_phy);
	}
	if (machine_is_omap_osk())
		gpio_free(9);
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
	clk_put(usb_dc_ck);
	clk_put(usb_host_ck);
	return 0;
}

static int xhci_plat_remove(struct platform_device *dev)
{
	struct usb_hcd	*hcd = platform_get_drvdata(dev);
	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);

	usb_remove_hcd(xhci->shared_hcd);
	usb_put_hcd(xhci->shared_hcd);

	usb_remove_hcd(hcd);
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
	kfree(xhci);

	if (phy && phy->otg) {
		otg_set_host(phy->otg, NULL);
		usb_put_transceiver(phy);
	}

	return 0;
}

static int __devexit exynos_xhci_remove(struct platform_device *pdev)
{
	struct exynos_xhci_hcd	*exynos_xhci = platform_get_drvdata(pdev);
	struct usb_hcd		*hcd = exynos_xhci->hcd;
	struct xhci_hcd		*xhci = hcd_to_xhci(hcd);

	if (exynos_xhci->core->otg)
		otg_set_host(exynos_xhci->core->otg, NULL);

	pm_runtime_disable(&pdev->dev);

	usb_remove_hcd(xhci->shared_hcd);
	usb_put_hcd(xhci->shared_hcd);

	usb_remove_hcd(hcd);
	usb_put_hcd(hcd);

	kfree(xhci);

	return 0;
}

static int mv_ehci_remove(struct platform_device *pdev)
{
	struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
	struct usb_hcd *hcd = ehci_mv->hcd;

	if (hcd->rh_registered)
		usb_remove_hcd(hcd);

	if (!IS_ERR_OR_NULL(ehci_mv->otg))
		otg_set_host(ehci_mv->otg->otg, NULL);

	if (ehci_mv->mode == MV_USB_MODE_HOST) {
		if (ehci_mv->pdata->set_vbus)
			ehci_mv->pdata->set_vbus(0);

		mv_ehci_disable(ehci_mv);
	}

	usb_put_hcd(hcd);

	return 0;
}

/**
 * usb_hcd_omap_remove - shutdown processing for OMAP-based HCDs
 * @dev: USB Host Controller being removed
 * Context: !in_interrupt()
 *
 * Reverses the effect of usb_hcd_omap_probe(), first invoking
 * the HCD's stop() method.  It is always called from a thread
 * context, normally "rmmod", "apmd", or something similar.
 */
static inline void
usb_hcd_omap_remove (struct usb_hcd *hcd, struct platform_device *pdev)
{
	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);

	usb_remove_hcd(hcd);
	if (ohci->transceiver) {
		(void) otg_set_host(ohci->transceiver, 0);
		put_device(ohci->transceiver->dev);
	}
#ifndef CONFIG_ARCH_OMAP34XX
	if (machine_is_omap_osk())
		gpio_free(9);
#endif
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);

#ifndef CONFIG_ARCH_OMAP34XX
	clk_put(usb_dc_ck);
	clk_put(usb_host_ck);
#endif
}

static int pxa310_start_otg_host_transcvr(struct usb_bus *host)
{
	int err;

	pxa310_otg_transceiver_rtsm();

	err = usb_phy_init(u2d->otg);
	if (err) {
		pr_err("OTG transceiver init failed");
		return err;
	}

	err = otg_set_vbus(u2d->otg->otg, 1);
	if (err) {
		pr_err("OTG transceiver VBUS set failed");
		return err;
	}

	err = otg_set_host(u2d->otg->otg, host);
	if (err)
		pr_err("OTG transceiver Host mode set failed");

	return err;
}

static int ohci_omap_init(struct usb_hcd *hcd)
{
	struct ohci_hcd		*ohci = hcd_to_ohci(hcd);
	struct omap_usb_config	*config = hcd->self.controller->platform_data;
	int			need_transceiver = (config->otg != 0);
	int			ret;

	dev_dbg(hcd->self.controller, "starting USB Controller\n");

	if (config->otg) {
		ohci_to_hcd(ohci)->self.otg_port = config->otg;
		/* default/minimum OTG power budget:  8 mA */
		ohci_to_hcd(ohci)->power_budget = 8;
	}

	/* boards can use OTG transceivers in non-OTG modes */
	need_transceiver = need_transceiver
			|| machine_is_omap_h2() || machine_is_omap_h3();

	if (cpu_is_omap16xx())
		ocpi_enable();

#ifdef	CONFIG_ARCH_OMAP_OTG
	if (need_transceiver) {
		ohci->transceiver = otg_get_transceiver();
		if (ohci->transceiver) {
			int	status = otg_set_host(ohci->transceiver,
						&ohci_to_hcd(ohci)->self);
			dev_dbg(hcd->self.controller, "init %s transceiver, status %d\n",
					ohci->transceiver->label, status);
			if (status) {
				if (ohci->transceiver)
					put_device(ohci->transceiver->dev);
				return status;
			}
		} else {
			dev_err(hcd->self.controller, "can't find transceiver\n");
			return -ENODEV;
		}
	}
#endif

	omap_ohci_clock_power(1);

	if (cpu_is_omap1510()) {
		omap_1510_local_bus_power(1);
		omap_1510_local_bus_init();
	}

	if ((ret = ohci_init(ohci)) < 0)
		return ret;

	/* board-specific power switching and overcurrent support */
	if (machine_is_omap_osk() || machine_is_omap_innovator()) {
		u32	rh = roothub_a (ohci);

		/* power switching (ganged by default) */
		rh &= ~RH_A_NPS;

		/* TPS2045 switch for internal transceiver (port 1) */
		if (machine_is_omap_osk()) {
			ohci_to_hcd(ohci)->power_budget = 250;

			rh &= ~RH_A_NOCP;

			/* gpio9 for overcurrent detction */
			omap_cfg_reg(W8_1610_GPIO9);
			omap_request_gpio(9);
			omap_set_gpio_direction(9, 1 /* IN */);

			/* for paranoia's sake:  disable USB.PUEN */
			omap_cfg_reg(W4_USB_HIGHZ);
		}
		ohci_writel(ohci, rh, &ohci->regs->roothub.a);
		distrust_firmware = 0;
	} else if (machine_is_nokia770()) {
		/* We require a self-powered hub, which should have
		 * plenty of power. */
		ohci_to_hcd(ohci)->power_budget = 0;
	}

	/* FIXME khubd hub requests should manage power switching */
	omap_ohci_transceiver_power(1);

	/* board init will have already handled HMC and mux setup.
	 * any external transceiver should already be initialized
	 * too, so all configured ports use the right signaling now.
	 */

	return 0;
}

static int ohci_omap_reset(struct usb_hcd *hcd)
{
	struct ohci_hcd		*ohci = hcd_to_ohci(hcd);
	struct omap_usb_config	*config = dev_get_platdata(hcd->self.controller);
	int			need_transceiver = (config->otg != 0);
	int			ret;

	dev_dbg(hcd->self.controller, "starting USB Controller\n");

	if (config->otg) {
		hcd->self.otg_port = config->otg;
		/* default/minimum OTG power budget:  8 mA */
		hcd->power_budget = 8;
	}

	/* boards can use OTG transceivers in non-OTG modes */
	need_transceiver = need_transceiver
			|| machine_is_omap_h2() || machine_is_omap_h3();

	/* XXX OMAP16xx only */
	if (config->ocpi_enable)
		config->ocpi_enable();

#ifdef	CONFIG_USB_OTG
	if (need_transceiver) {
		hcd->phy = usb_get_phy(USB_PHY_TYPE_USB2);
		if (!IS_ERR_OR_NULL(hcd->phy)) {
			int	status = otg_set_host(hcd->phy->otg,
						&ohci_to_hcd(ohci)->self);
			dev_dbg(hcd->self.controller, "init %s phy, status %d\n",
					hcd->phy->label, status);
			if (status) {
				usb_put_phy(hcd->phy);
				return status;
			}
		} else {
			dev_err(hcd->self.controller, "can't find phy\n");
			return -ENODEV;
		}
		ohci->start_hnp = start_hnp;
	}
#endif

	omap_ohci_clock_power(1);

	if (cpu_is_omap15xx()) {
		omap_1510_local_bus_power(1);
		omap_1510_local_bus_init();
	}

	ret = ohci_setup(hcd);
	if (ret < 0)
		return ret;

	if (config->otg || config->rwc) {
		ohci->hc_control = OHCI_CTRL_RWC;
		writel(OHCI_CTRL_RWC, &ohci->regs->control);
	}

	/* board-specific power switching and overcurrent support */
	if (machine_is_omap_osk() || machine_is_omap_innovator()) {
		u32	rh = roothub_a (ohci);

		/* power switching (ganged by default) */
		rh &= ~RH_A_NPS;

		/* TPS2045 switch for internal transceiver (port 1) */
		if (machine_is_omap_osk()) {
			ohci_to_hcd(ohci)->power_budget = 250;

			rh &= ~RH_A_NOCP;

			/* gpio9 for overcurrent detction */
			omap_cfg_reg(W8_1610_GPIO9);
			gpio_request(9, "OHCI overcurrent");
			gpio_direction_input(9);

			/* for paranoia's sake:  disable USB.PUEN */
			omap_cfg_reg(W4_USB_HIGHZ);
		}
		ohci_writel(ohci, rh, &ohci->regs->roothub.a);
		ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
	} else if (machine_is_nokia770()) {
		/* We require a self-powered hub, which should have
		 * plenty of power. */
		ohci_to_hcd(ohci)->power_budget = 0;
	}

	/* FIXME khubd hub requests should manage power switching */
	omap_ohci_transceiver_power(1);

	/* board init will have already handled HMC and mux setup.
	 * any external transceiver should already be initialized
	 * too, so all configured ports use the right signaling now.
	 */

	return 0;
}

//.........这里部分代码省略.........
		err = -ENOMEM;
		goto fail_io;
	}

	/* This is pretty ugly and needs to be fixed when we do only
	 * device-tree probing. Old code relies on the platform_device
	 * numbering that we lack for device-tree-instantiated devices.
	 */
	if (instance < 0) {
		switch (res->start) {
		case TEGRA_USB_BASE:
			instance = 0;
			break;
		case TEGRA_USB2_BASE:
			instance = 1;
			break;
		case TEGRA_USB3_BASE:
			instance = 2;
			break;
		default:
			err = -ENODEV;
			dev_err(&pdev->dev, "unknown usb instance\n");
			goto fail_io;
		}
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "failed to get IRQ\n");
		err = -ENODEV;
		goto fail_io;
	}
	tegra->irq = irq;

	tegra->unaligned_dma_buf_supported = pdata->unaligned_dma_buf_supported;
	tegra->has_hostpc = pdata->has_hostpc;

	tegra->phy = tegra_usb_phy_open(pdev);
	hcd->phy = get_usb_phy(tegra->phy);
	if (IS_ERR(tegra->phy)) {
		dev_err(&pdev->dev, "failed to open USB phy\n");
		err = -ENXIO;
		goto fail_io;
	}

	err = tegra_usb_phy_power_on(tegra->phy);
	if (err) {
		dev_err(&pdev->dev, "failed to power on the phy\n");
		goto fail_phy;
	}

	err = usb_phy_init(get_usb_phy(tegra->phy));
	if (err) {
		dev_err(&pdev->dev, "failed to init the phy\n");
		goto fail_phy;
	}

	err = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_TRIGGER_HIGH);
	if (err) {
		dev_err(&pdev->dev, "Failed to add USB HCD, error=%d\n", err);
		goto fail_phy;
	}

	tegra->ehci = hcd_to_ehci(hcd);

	if (pdata->port_otg) {
		tegra->transceiver =
			devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
		if (!IS_ERR_OR_NULL(tegra->transceiver))
			otg_set_host(tegra->transceiver->otg, &hcd->self);
	}

	tegra_pd_add_device(&pdev->dev);
	pm_runtime_enable(&pdev->dev);

#ifdef CONFIG_TEGRA_EHCI_BOOST_CPU_FREQ
	INIT_DELAYED_WORK(&tegra->boost_cpu_freq_work,
					tegra_ehci_boost_cpu_frequency_work);
	pm_qos_add_request(&tegra->boost_cpu_freq_req, PM_QOS_CPU_FREQ_MIN,
					PM_QOS_DEFAULT_VALUE);
	schedule_delayed_work(&tegra->boost_cpu_freq_work, 12000);
	tegra->cpu_boost_in_work = true;
#endif

	wake_lock_init(&tegra->ehci_wake_lock,
		       WAKE_LOCK_SUSPEND, dev_name(&pdev->dev));

	return err;

fail_phy:
	usb_phy_shutdown(get_usb_phy(tegra->phy));
fail_io:
#ifdef CONFIG_TEGRA_EHCI_BOOST_CPU_FREQ
	device_remove_file(hcd->self.controller, &dev_attr_boost_enable);
fail_sysfs:
#endif
	usb_put_hcd(hcd);

	return err;
}

static int msm_xusb_init_host(struct platform_device *pdev,
                              struct msmusb_hcd *mhcd)
{
    int ret = 0;
    struct msm_otg *otg;
    struct usb_hcd *hcd = mhcd_to_hcd(mhcd);
    struct ehci_hcd *ehci = hcd_to_ehci(hcd);
    struct msm_usb_host_platform_data *pdata = mhcd->pdata;

    switch (PHY_TYPE(pdata->phy_info)) {
    case USB_PHY_INTEGRATED:
        msm_hsusb_rpc_connect();

        if (pdata->vbus_init)
            pdata->vbus_init(1);

        /* VBUS might be present. Turn off vbus */
        if (pdata->vbus_power)
            pdata->vbus_power(pdata->phy_info, 0);

        INIT_WORK(&mhcd->otg_work, msm_hsusb_otg_work);
        mhcd->xceiv = usb_get_transceiver();
        if (!mhcd->xceiv)
            return -ENODEV;
        otg = container_of(mhcd->xceiv, struct msm_otg, phy);
        hcd->regs = otg->regs;
        otg->start_host = msm_hsusb_start_host;

        ret = otg_set_host(mhcd->xceiv->otg, &hcd->self);
        ehci->transceiver = mhcd->xceiv;
        break;
    case USB_PHY_SERIAL_PMIC:
        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);

        if (!hcd->regs)
            return -EFAULT;
        /* get usb clocks */
        mhcd->alt_core_clk = clk_get(&pdev->dev, "alt_core_clk");
        if (IS_ERR(mhcd->alt_core_clk)) {
            iounmap(hcd->regs);
            return PTR_ERR(mhcd->alt_core_clk);
        }

        mhcd->iface_clk = clk_get(&pdev->dev, "iface_clk");
        if (IS_ERR(mhcd->iface_clk)) {
            iounmap(hcd->regs);
            clk_put(mhcd->alt_core_clk);
            return PTR_ERR(mhcd->iface_clk);
        }
        mhcd->otg_ops.request = msm_hsusb_request_host;
        mhcd->otg_ops.handle = (void *) mhcd;
        ret = msm_xusb_init_phy(mhcd);
        if (ret < 0) {
            iounmap(hcd->regs);
            clk_put(mhcd->alt_core_clk);
            clk_put(mhcd->iface_clk);
        }
        break;
    default:
        pr_err("phy type is bad\n");
    }
    return ret;
}

//.........这里部分代码省略.........
		err = -ENXIO;
		goto fail_io;
	}
	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);
	hcd->regs = ioremap(res->start, resource_size(res));
	if (!hcd->regs) {
		dev_err(&pdev->dev, "failed to remap I/O memory\n");
		err = -ENOMEM;
		goto fail_io;
	}

	/* This is pretty ugly and needs to be fixed when we do only
	 * device-tree probing. Old code relies on the platform_device
	 * numbering that we lack for device-tree-instantiated devices.
	 */
	if (instance < 0) {
		switch (res->start) {
		case TEGRA_USB_BASE:
			instance = 0;
			break;
		case TEGRA_USB2_BASE:
			instance = 1;
			break;
		case TEGRA_USB3_BASE:
			instance = 2;
			break;
		default:
			err = -ENODEV;
			dev_err(&pdev->dev, "unknown usb instance\n");
			goto fail_phy;
		}
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "failed to get IRQ\n");
		err = -ENODEV;
		goto fail_irq;
	}
	tegra->irq = irq;

	pdata = dev_get_platdata(&pdev->dev);
	tegra->unaligned_dma_buf_supported = pdata->unaligned_dma_buf_supported;
	tegra->has_hostpc = pdata->has_hostpc;

	tegra->phy = tegra_usb_phy_open(pdev);
	if (IS_ERR(tegra->phy)) {
		dev_err(&pdev->dev, "failed to open USB phy\n");
		err = -ENXIO;
		goto fail_irq;
	}

	err = tegra_usb_phy_power_on(tegra->phy);
	if (err) {
		dev_err(&pdev->dev, "failed to power on the phy\n");
		goto fail_phy;
	}

	err = usb_phy_init(get_usb_phy(tegra->phy));
	if (err) {
		dev_err(&pdev->dev, "failed to init the phy\n");
		goto fail_phy;
	}

	err = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_TRIGGER_HIGH);
	if (err) {
		dev_err(&pdev->dev, "Failed to add USB HCD, error=%d\n", err);
		goto fail_phy;
	}

	err = enable_irq_wake(tegra->irq);
	if (err < 0) {
		dev_warn(&pdev->dev,
				"Couldn't enable USB host mode wakeup, irq=%d, "
				"error=%d\n", irq, err);
		err = 0;
		tegra->irq = 0;
	}

	tegra->ehci = hcd_to_ehci(hcd);

#ifdef CONFIG_USB_OTG_UTILS
	if (pdata->port_otg) {
		tegra->transceiver = usb_get_transceiver();
		if (tegra->transceiver)
			otg_set_host(tegra->transceiver->otg, &hcd->self);
	}
#endif
	return err;

fail_phy:
	usb_phy_shutdown(get_usb_phy(tegra->phy));
fail_irq:
	iounmap(hcd->regs);
fail_io:
	usb_put_hcd(hcd);

	return err;
}

static int xhci_dwc_drv_probe(struct platform_device *pdev)
{
	struct dwc_otg2 *otg;
	struct usb_phy *usb_phy;
	struct dwc_device_par *pdata;
	struct usb_hcd *hcd;
	struct resource *res;
	int retval = 0;
	int ret;

	if (usb_disabled())
		return -ENODEV;

	pr_debug("initializing FSL-SOC USB Controller\n");

	/* Need platform data for setup */
	pdata = (struct dwc_device_par *)pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev,
			"No platform data for %s.\n", dev_name(&pdev->dev));
		return -ENODEV;
	}

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!res) {
		dev_err(&pdev->dev,
			"Found HC with no IRQ. Check %s setup!\n",
			dev_name(&pdev->dev));
		return -ENODEV;
	}
	dwc3_xhci.otg_irqnum = res->start;

	hcd = usb_create_hcd(&xhci_dwc_hc_driver,
			&pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
		retval = -ENOMEM;
		return retval;
	}

	hcd->regs = pdata->io_addr;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev,
			"Found HC with no IRQ. Check %s setup!\n",
			dev_name(&pdev->dev));
		return -ENODEV;
	}
	hcd->rsrc_start = res->start;
	hcd->rsrc_len = res->end - res->start;

	usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
	if (usb_phy)
		otg_set_host(usb_phy->otg, &hcd->self);

	otg = container_of(usb_phy->otg, struct dwc_otg2, otg);
	if (otg) {
		otg->start_host = dwc3_start_host;
		otg->stop_host = dwc3_stop_host;
		otg->suspend_host = dwc3_suspend_host;
		otg->resume_host = dwc3_resume_host;
	}

	usb_put_phy(usb_phy);

	/* Enable wakeup irq */
	hcd->has_wakeup_irq = 1;
	INIT_WORK(&dwc3_xhci.reset_hcd, dwc3_host_reset);
	INIT_WORK(&dwc3_xhci.poll_loopback, dwc3_poll_lp);
	wake_lock_init(&dwc3_xhci.wakelock, WAKE_LOCK_SUSPEND,
			"dwc3_host_wakelock");

	platform_set_drvdata(pdev, hcd);
	pm_runtime_no_callbacks(hcd->self.controller);
	pm_runtime_enable(hcd->self.controller);
	ret = device_create_file(hcd->self.controller, &dev_attr_host_comp_test);
	if (ret < 0)
		dev_err(hcd->self.controller,
			"Can't register sysfs attribute: %d\n", ret);

	return retval;
}

//.........这里部分代码省略.........
		goto err_iounmap_phyreg;
	}

	retval = mv_ehci_enable(ehci_mv);
	if (retval) {
		dev_err(&pdev->dev, "init phy error %d\n", retval);
		goto err_iounmap_capreg;
	}

	offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
	ehci_mv->op_regs =
		(void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);

	hcd->rsrc_start = r->start;
	hcd->rsrc_len = r->end - r->start + 1;
	hcd->regs = ehci_mv->op_regs;

	hcd->irq = platform_get_irq(pdev, 0);
	if (!hcd->irq) {
		dev_err(&pdev->dev, "Cannot get irq.");
		retval = -ENODEV;
		goto err_disable_clk;
	}

	ehci = hcd_to_ehci(hcd);
	ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs;
	ehci->regs = (struct ehci_regs *) ehci_mv->op_regs;
	ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);

	ehci_mv->mode = pdata->mode;
	if (ehci_mv->mode == MV_USB_MODE_OTG) {
#ifdef CONFIG_USB_OTG_UTILS
		ehci_mv->otg = usb_get_transceiver();
		if (!ehci_mv->otg) {
			dev_err(&pdev->dev,
				"unable to find transceiver\n");
			retval = -ENODEV;
			goto err_disable_clk;
		}

		retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
		if (retval < 0) {
			dev_err(&pdev->dev,
				"unable to register with transceiver\n");
			retval = -ENODEV;
			goto err_put_transceiver;
		}
		/*                                          */
		mv_ehci_disable(ehci_mv);
#else
		dev_info(&pdev->dev, "MV_USB_MODE_OTG "
			 "must have CONFIG_USB_OTG_UTILS enabled\n");
		goto err_disable_clk;
#endif
	} else {
		if (pdata->set_vbus)
			pdata->set_vbus(1);

		retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
		if (retval) {
			dev_err(&pdev->dev,
				"failed to add hcd with err %d\n", retval);
			goto err_set_vbus;
		}
	}

	if (pdata->private_init)
		pdata->private_init(ehci_mv->op_regs, ehci_mv->phy_regs);

	dev_info(&pdev->dev,
		 "successful find EHCI device with regs 0x%p irq %d"
		 " working in %s mode\n", hcd->regs, hcd->irq,
		 ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");

	return 0;

err_set_vbus:
	if (pdata->set_vbus)
		pdata->set_vbus(0);
#ifdef CONFIG_USB_OTG_UTILS
err_put_transceiver:
	if (ehci_mv->otg)
		usb_put_transceiver(ehci_mv->otg);
#endif
err_disable_clk:
	mv_ehci_disable(ehci_mv);
err_iounmap_capreg:
	iounmap(ehci_mv->cap_regs);
err_iounmap_phyreg:
	iounmap(ehci_mv->phy_regs);
err_put_clk:
	for (clk_i--; clk_i >= 0; clk_i--)
		clk_put(ehci_mv->clk[clk_i]);
	platform_set_drvdata(pdev, NULL);
	kfree(ehci_mv);
err_put_hcd:
	usb_put_hcd(hcd);

	return retval;
}

/**
 * usb_hcd_fsl_probe - initialize FSL-based HCDs
 * @drvier: Driver to be used for this HCD
 * @pdev: USB Host Controller being probed
 * Context: !in_interrupt()
 *
 * Allocates basic resources for this USB host controller.
 *
 */
static int usb_hcd_fsl_probe(const struct hc_driver *driver,
			     struct platform_device *pdev)
{
	struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
	struct usb_hcd *hcd;
	struct resource *res;
	int irq;
	int retval;

	pr_debug("initializing FSL-SOC USB Controller\n");

	/* Need platform data for setup */
	if (!pdata) {
		dev_err(&pdev->dev,
			"No platform data for %s.\n", pdev->dev.bus_id);
		return -ENODEV;
	}

	retval = fsl_platform_verify(pdev);
	if (retval)
		return retval;

	/*
	 * do platform specific init: check the clock, grab/config pins, etc.
	 */
	if (pdata->platform_init && pdata->platform_init(pdev)) {
		retval = -ENODEV;
		goto err1;
	}

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!res) {
		dev_err(&pdev->dev,
			"Found HC with no IRQ. Check %s setup!\n",
			pdev->dev.bus_id);
		return -ENODEV;
	}
	irq = res->start;

	fsl_platform_set_vbus_power(pdata, 1);

	hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
	if (!hcd) {
		retval = -ENOMEM;
		goto err1;
	}

	hcd->rsrc_start = pdata->r_start;
	hcd->rsrc_len = pdata->r_len;
	hcd->regs = pdata->regs;
	vdbg("rsrc_start=0x%llx rsrc_len=0x%llx virtual=0x%x\n",
	     hcd->rsrc_start, hcd->rsrc_len, hcd->regs);

	hcd->power_budget = pdata->power_budget;

	/* DDD
	 * the following must be done by this point, otherwise the OTG
	 * host port doesn't make it thru initializtion.
	 * ehci_halt(), called by ehci_fsl_setup() returns -ETIMEDOUT
	 */
	fsl_platform_set_host_mode(hcd);

	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (retval != 0) {
		pr_debug("failed with usb_add_hcd\n");
		goto err2;
	}
#if defined(CONFIG_USB_OTG)
	if (pdata->does_otg) {
		struct ehci_hcd *ehci = hcd_to_ehci(hcd);

		dbg("pdev=0x%p  hcd=0x%p  ehci=0x%p\n", pdev, hcd, ehci);

		ehci->transceiver = otg_get_transceiver();
		dbg("ehci->transceiver=0x%p\n", ehci->transceiver);

		if (ehci->transceiver) {
			retval = otg_set_host(ehci->transceiver,
					      &ehci_to_hcd(ehci)->self);
			if (retval) {
				if (ehci->transceiver)
					put_device(ehci->transceiver->dev);
				goto err2;
			}
		} else {
			printk(KERN_ERR "can't find transceiver\n");
			retval = -ENODEV;
			goto err2;
		}
	}
#endif
//.........这里部分代码省略.........

//.........这里部分代码省略.........
	hcd = usb_create_hcd(driver, dev, dev_name(dev));
	if (!hcd) {
		dev_err(dev, "Failed to create primary HCD\n");
		return -ENOMEM;
	}

	exynos_xhci->hcd = hcd;
	/* Rewrite driver data with our structure */
	platform_set_drvdata(pdev, exynos_xhci);

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	if (!devm_request_mem_region(dev, res->start,
				     resource_size(res), dev_name(dev))) {
		dev_err(dev, "Failed to reserve registers\n");
		err = -ENOENT;
		goto put_hcd;
	}

	hcd->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
	if (!hcd->regs) {
		dev_err(dev, "Failed to remap I/O memory\n");
		err = -ENOMEM;
		goto put_hcd;
	}
	hcd->regs -= EXYNOS_USB3_XHCI_REG_START;

	err = exynos_drd_try_get(pdev);
	if (err) {
		/* REVISIT: what shall we do if UDC is already running */
		dev_err(dev, "Failed to access DRD\n");
		goto put_hcd;
	}

	/* Wake up and initialize DRD core */
	pm_runtime_get_sync(dev->parent);
	if (exynos_xhci->core->ops->change_mode)
		exynos_xhci->core->ops->change_mode(exynos_xhci->core, true);
	if (exynos_xhci->core->ops->core_init)
		exynos_xhci->core->ops->core_init(exynos_xhci->core);

	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (err) {
		dev_err(dev, "Failed to add primary HCD\n");
		goto put_hcd;
	}

	/* Create and add shared HCD */

	xhci = hcd_to_xhci(hcd);
	exynos_xhci_dbg = xhci;

	xhci->shared_hcd = usb_create_shared_hcd(driver, dev,
						 dev_name(dev), hcd);
	if (!xhci->shared_hcd) {
		dev_err(dev, "Failed to create shared HCD\n");
		err = -ENOMEM;
		goto remove_hcd;
	}

	xhci->shared_hcd->regs = hcd->regs;

	/*
	 * Set the xHCI pointer before exynos_xhci_setup()
	 * (aka hcd_driver.reset) is called by usb_add_hcd().
	 */
	*((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;

	err = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
	if (err) {
		dev_err(dev, "Failed to add shared HCD\n");
		goto put_usb3_hcd;
	}

	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	if (exynos_xhci->core->otg) {
		err = otg_set_host(exynos_xhci->core->otg, &hcd->self);
		if (err) {
			dev_err(dev, "Unable to bind hcd to DRD switch\n");
			goto remove_usb3_hcd;
		}
	}

	return 0;

remove_usb3_hcd:
	pm_runtime_disable(dev);
	usb_remove_hcd(xhci->shared_hcd);
put_usb3_hcd:
	usb_put_hcd(xhci->shared_hcd);
remove_hcd:
	usb_remove_hcd(hcd);
put_hcd:
	usb_put_hcd(hcd);

	return err;
}

static int ehci_msm_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	struct resource *res;
	int ret;

	dev_dbg(&pdev->dev, "ehci_msm proble\n");

	hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
		dev_err(&pdev->dev, "Unable to create HCD\n");
		return  -ENOMEM;
	}

	hcd->irq = platform_get_irq(pdev, 0);
	if (hcd->irq < 0) {
		dev_err(&pdev->dev, "Unable to get IRQ resource\n");
		ret = hcd->irq;
		goto put_hcd;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "Unable to get memory resource\n");
		ret = -ENODEV;
		goto put_hcd;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);
	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	if (!hcd->regs) {
		dev_err(&pdev->dev, "ioremap failed\n");
		ret = -ENOMEM;
		goto put_hcd;
	}

	/*
	 * OTG driver takes care of PHY initialization, clock management,
	 * powering up VBUS, mapping of registers address space and power
	 * management.
	 */
	otg = otg_get_transceiver();
	if (!otg) {
		dev_err(&pdev->dev, "unable to find transceiver\n");
		ret = -ENODEV;
		goto unmap;
	}

	ret = otg_set_host(otg, &hcd->self);
	if (ret < 0) {
		dev_err(&pdev->dev, "unable to register with transceiver\n");
		goto put_transceiver;
	}

	device_init_wakeup(&pdev->dev, 1);
	/*
	 * OTG device parent of HCD takes care of putting
	 * hardware into low power mode.
	 */
	pm_runtime_no_callbacks(&pdev->dev);
	pm_runtime_enable(&pdev->dev);

	return 0;

put_transceiver:
	otg_put_transceiver(otg);
unmap:
	iounmap(hcd->regs);
put_hcd:
	usb_put_hcd(hcd);

	return ret;
}

//.........这里部分代码省略.........
	ehci_mv->phy_regs = devm_ioremap_resource(&pdev->dev, r);
	if (IS_ERR(ehci_mv->phy_regs)) {
		retval = PTR_ERR(ehci_mv->phy_regs);
		goto err_put_hcd;
	}

	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "capregs");
	if (!r) {
		dev_err(&pdev->dev, "no I/O memory resource defined\n");
		retval = -ENODEV;
		goto err_put_hcd;
	}

	ehci_mv->cap_regs = devm_ioremap_resource(&pdev->dev, r);
	if (IS_ERR(ehci_mv->cap_regs)) {
		retval = PTR_ERR(ehci_mv->cap_regs);
		goto err_put_hcd;
	}

	retval = mv_ehci_enable(ehci_mv);
	if (retval) {
		dev_err(&pdev->dev, "init phy error %d\n", retval);
		goto err_put_hcd;
	}

	offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
	ehci_mv->op_regs =
		(void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);

	hcd->rsrc_start = r->start;
	hcd->rsrc_len = resource_size(r);
	hcd->regs = ehci_mv->op_regs;

	hcd->irq = platform_get_irq(pdev, 0);
	if (!hcd->irq) {
		dev_err(&pdev->dev, "Cannot get irq.");
		retval = -ENODEV;
		goto err_disable_clk;
	}

	ehci = hcd_to_ehci(hcd);
	ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs;

	ehci_mv->mode = pdata->mode;
	if (ehci_mv->mode == MV_USB_MODE_OTG) {
		ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
		if (IS_ERR(ehci_mv->otg)) {
			retval = PTR_ERR(ehci_mv->otg);

			if (retval == -ENXIO)
				dev_info(&pdev->dev, "MV_USB_MODE_OTG "
						"must have CONFIG_USB_PHY enabled\n");
			else
				dev_err(&pdev->dev,
						"unable to find transceiver\n");
			goto err_disable_clk;
		}

		retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
		if (retval < 0) {
			dev_err(&pdev->dev,
				"unable to register with transceiver\n");
			retval = -ENODEV;
			goto err_disable_clk;
		}
		/* otg will enable clock before use as host */
		mv_ehci_disable(ehci_mv);
	} else {
		if (pdata->set_vbus)
			pdata->set_vbus(1);

		retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
		if (retval) {
			dev_err(&pdev->dev,
				"failed to add hcd with err %d\n", retval);
			goto err_set_vbus;
		}
		device_wakeup_enable(hcd->self.controller);
	}

	if (pdata->private_init)
		pdata->private_init(ehci_mv->op_regs, ehci_mv->phy_regs);

	dev_info(&pdev->dev,
		 "successful find EHCI device with regs 0x%p irq %d"
		 " working in %s mode\n", hcd->regs, hcd->irq,
		 ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");

	return 0;

err_set_vbus:
	if (pdata->set_vbus)
		pdata->set_vbus(0);
err_disable_clk:
	mv_ehci_disable(ehci_mv);
err_put_hcd:
	usb_put_hcd(hcd);

	return retval;
}

//.........这里部分代码省略.........
	ehci_mv->cap_regs = devm_ioremap(&pdev->dev, r->start,
					 resource_size(r));
	if (ehci_mv->cap_regs == NULL) {
		dev_err(&pdev->dev, "failed to map I/O memory\n");
		retval = -EFAULT;
		goto err_clear_drvdata;
	}

	ehci_mv->phy = devm_usb_get_phy_dev(&pdev->dev, MV_USB2_PHY_INDEX);
	if (IS_ERR_OR_NULL(ehci_mv->phy)) {
		retval = PTR_ERR(ehci_mv->phy);
		if (retval != -EPROBE_DEFER && retval != -ENODEV)
			dev_err(&pdev->dev, "failed to get the outer phy\n");
		else {
			kfree(hcd->bandwidth_mutex);
			kfree(hcd);

			return -EPROBE_DEFER;
		}
		goto err_clear_drvdata;
	}

	retval = mv_ehci_enable(ehci_mv);
	if (retval) {
		dev_err(&pdev->dev, "init phy error %d\n", retval);
		goto err_clear_drvdata;
	}

	offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
	ehci_mv->op_regs =
		(void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);

	hcd->rsrc_start = r->start;
	hcd->rsrc_len = resource_size(r);
	hcd->regs = ehci_mv->op_regs;

	hcd->irq = platform_get_irq(pdev, 0);
	if (!hcd->irq) {
		dev_err(&pdev->dev, "Cannot get irq.");
		retval = -ENODEV;
		goto err_disable_clk;
	}

	ehci = hcd_to_ehci(hcd);
	ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs;

	ehci_mv->mode = pdata->mode;
	if (ehci_mv->mode == MV_USB_MODE_OTG) {
		ehci_mv->otg = devm_usb_get_phy_dev(&pdev->dev,
						MV_USB2_OTG_PHY_INDEX);
		if (IS_ERR(ehci_mv->otg)) {
			retval = PTR_ERR(ehci_mv->otg);

			if (retval == -ENXIO)
				dev_info(&pdev->dev, "MV_USB_MODE_OTG "
						"must have CONFIG_USB_PHY enabled\n");
			else if (retval != -EPROBE_DEFER)
				dev_err(&pdev->dev,
						"unable to find transceiver\n");
			goto err_disable_clk;
		}

		retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
		if (retval < 0) {
			dev_err(&pdev->dev,
				"unable to register with transceiver\n");
			retval = -ENODEV;
			goto err_disable_clk;
		}
		/* otg will enable clock before use as host */
		mv_ehci_disable(ehci_mv);
	} else {
		pxa_usb_extern_call(pdata->id, vbus, set_vbus, 1);

		retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
		if (retval) {
			dev_err(&pdev->dev,
				"failed to add hcd with err %d\n", retval);
			goto err_set_vbus;
		}
	}

	dev_info(&pdev->dev,
		 "successful find EHCI device with regs 0x%p irq %d"
		 " working in %s mode\n", hcd->regs, hcd->irq,
		 ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");

	return 0;

err_set_vbus:
	pxa_usb_extern_call(pdata->id, vbus, set_vbus, 0);
err_disable_clk:
	mv_ehci_disable(ehci_mv);
err_clear_drvdata:
	platform_set_drvdata(pdev, NULL);
err_put_hcd:
	usb_put_hcd(hcd);

	return retval;
}

static int ehci_msm_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	struct resource *res;
	int ret;

	dev_dbg(&pdev->dev, "ehci_msm proble\n");

	if (!pdev->dev.dma_mask)
		pdev->dev.dma_mask = &msm_ehci_dma_mask;
	if (!pdev->dev.coherent_dma_mask)
		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);

	hcd = usb_create_hcd(&ehci_msm_hc_driver, &pdev->dev,
			     dev_name(&pdev->dev));
	if (!hcd) {
		dev_err(&pdev->dev, "Unable to create HCD\n");
		return  -ENOMEM;
	}

	hcd_to_bus(hcd)->skip_resume = true;

	hcd->irq = platform_get_irq(pdev, 0);
	if (hcd->irq < 0) {
		dev_err(&pdev->dev, "Unable to get IRQ resource\n");
		ret = hcd->irq;
		goto put_hcd;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "Unable to get memory resource\n");
		ret = -ENODEV;
		goto put_hcd;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);
	hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
	if (!hcd->regs) {
		dev_err(&pdev->dev, "ioremap failed\n");
		ret = -ENOMEM;
		goto put_hcd;
	}

	/*
	 * OTG driver takes care of PHY initialization, clock management,
	 * powering up VBUS, mapping of registers address space and power
	 * management.
	 */
	phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
	if (IS_ERR_OR_NULL(phy)) {
		dev_err(&pdev->dev, "unable to find transceiver\n");
		ret = -ENODEV;
		goto put_hcd;
	}

	ret = otg_set_host(phy->otg, &hcd->self);
	if (ret < 0) {
		dev_err(&pdev->dev, "unable to register with transceiver\n");
		goto put_hcd;
	}

	hcd->phy = phy;
	device_init_wakeup(&pdev->dev, 1);
	pm_runtime_e