1 files changed, 715 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
new file mode 100644
index 000000000000..a516af28c29b
--- /dev/null
+++ b/drivers/usb/host/ehci-tegra.c
@@ -0,0 +1,715 @@
+/*
+ * EHCI-compliant USB host controller driver for NVIDIA Tegra SoCs
+ *
+ * Copyright (C) 2010 Google, Inc.
+ * Copyright (C) 2009 NVIDIA Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/tegra_usb.h>
+#include <linux/irq.h>
+#include <linux/usb/otg.h>
+#include <mach/usb_phy.h>
+
+#define TEGRA_USB_DMA_ALIGN 32
+
+struct tegra_ehci_hcd {
+        struct ehci_hcd *ehci;
+        struct tegra_usb_phy *phy;
+        struct clk *clk;
+        struct clk *emc_clk;
+        struct otg_transceiver *transceiver;
+        int host_resumed;
+        int bus_suspended;
+        int port_resuming;
+        int power_down_on_bus_suspend;
+        enum tegra_usb_phy_port_speed port_speed;
+};
+
+static void tegra_ehci_power_up(struct usb_hcd *hcd)
+{
+        struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
+
+        clk_enable(tegra->emc_clk);
+        clk_enable(tegra->clk);
+        tegra_usb_phy_power_on(tegra->phy);
+        tegra->host_resumed = 1;
+}
+
+static void tegra_ehci_power_down(struct usb_hcd *hcd)
+{
+        struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
+
+        tegra->host_resumed = 0;
+        tegra_usb_phy_power_off(tegra->phy);
+        clk_disable(tegra->clk);
+        clk_disable(tegra->emc_clk);
+}
+
+static int tegra_ehci_hub_control(
+        struct usb_hcd  *hcd,
+        u16             typeReq,
+        u16             wValue,
+        u16             wIndex,
+        char            *buf,
+        u16             wLength
+)
+{
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
+        u32 __iomem     *status_reg;
+        u32             temp;
+        unsigned long   flags;
+        int             retval = 0;
+
+        status_reg = &ehci->regs->port_status[(wIndex & 0xff) - 1];
+
+        spin_lock_irqsave(&ehci->lock, flags);
+
+        /*
+         * In ehci_hub_control() for USB_PORT_FEAT_ENABLE clears the other bits
+         * that are write on clear, by writing back the register read value, so
+         * USB_PORT_FEAT_ENABLE is handled by masking the set on clear bits
+         */
+        if (typeReq == ClearPortFeature && wValue == USB_PORT_FEAT_ENABLE) {
+                temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
+                ehci_writel(ehci, temp & ~PORT_PE, status_reg);
+                goto done;
+        }
+
+        else if (typeReq == GetPortStatus) {
+                temp = ehci_readl(ehci, status_reg);
+                if (tegra->port_resuming && !(temp & PORT_SUSPEND)) {
+                        /* Resume completed, re-enable disconnect detection */
+                        tegra->port_resuming = 0;
+                        tegra_usb_phy_postresume(tegra->phy);
+                }
+        }
+
+        else if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
+                temp = ehci_readl(ehci, status_reg);
+                if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
+                        retval = -EPIPE;
+                        goto done;
+                }
+
+                temp &= ~PORT_WKCONN_E;
+                temp |= PORT_WKDISC_E | PORT_WKOC_E;
+                ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
+
+                /*
+                 * If a transaction is in progress, there may be a delay in
+                 * suspending the port. Poll until the port is suspended.
+                 */
+                if (handshake(ehci, status_reg, PORT_SUSPEND,
+                                                PORT_SUSPEND, 5000))
+                        pr_err("%s: timeout waiting for SUSPEND\n", __func__);
+
+                set_bit((wIndex & 0xff) - 1, &ehci->suspended_ports);
+                goto done;
+        }
+
+        /*
+         * Tegra host controller will time the resume operation to clear the bit
+         * when the port control state switches to HS or FS Idle. This behavior
+         * is different from EHCI where the host controller driver is required
+         * to set this bit to a zero after the resume duration is timed in the
+         * driver.
+         */
+        else if (typeReq == ClearPortFeature &&
+                                        wValue == USB_PORT_FEAT_SUSPEND) {
+                temp = ehci_readl(ehci, status_reg);
+                if ((temp & PORT_RESET) || !(temp & PORT_PE)) {
+                        retval = -EPIPE;
+                        goto done;
+                }
+
+                if (!(temp & PORT_SUSPEND))
+                        goto done;
+
+                /* Disable disconnect detection during port resume */
+                tegra_usb_phy_preresume(tegra->phy);
+
+                ehci->reset_done[wIndex-1] = jiffies + msecs_to_jiffies(25);
+
+                temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
+                /* start resume signalling */
+                ehci_writel(ehci, temp | PORT_RESUME, status_reg);
+
+                spin_unlock_irqrestore(&ehci->lock, flags);
+                msleep(20);
+                spin_lock_irqsave(&ehci->lock, flags);
+
+                /* Poll until the controller clears RESUME and SUSPEND */
+                if (handshake(ehci, status_reg, PORT_RESUME, 0, 2000))
+                        pr_err("%s: timeout waiting for RESUME\n", __func__);
+                if (handshake(ehci, status_reg, PORT_SUSPEND, 0, 2000))
+                        pr_err("%s: timeout waiting for SUSPEND\n", __func__);
+
+                ehci->reset_done[wIndex-1] = 0;
+
+                tegra->port_resuming = 1;
+                goto done;
+        }
+
+        spin_unlock_irqrestore(&ehci->lock, flags);
+
+        /* Handle the hub control events here */
+        return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
+done:
+        spin_unlock_irqrestore(&ehci->lock, flags);
+        return retval;
+}
+
+static void tegra_ehci_restart(struct usb_hcd *hcd)
+{
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+        ehci_reset(ehci);
+
+        /* setup the frame list and Async q heads */
+        ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
+        ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
+        /* setup the command register and set the controller in RUN mode */
+        ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
+        ehci->command |= CMD_RUN;
+        ehci_writel(ehci, ehci->command, &ehci->regs->command);
+
+        down_write(&ehci_cf_port_reset_rwsem);
+        ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
+        /* flush posted writes */
+        ehci_readl(ehci, &ehci->regs->command);
+        up_write(&ehci_cf_port_reset_rwsem);
+}
+
+static int tegra_usb_suspend(struct usb_hcd *hcd)
+{
+        struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
+        struct ehci_regs __iomem *hw = tegra->ehci->regs;
+        unsigned long flags;
+
+        spin_lock_irqsave(&tegra->ehci->lock, flags);
+
+        tegra->port_speed = (readl(&hw->port_status[0]) >> 26) & 0x3;
+        ehci_halt(tegra->ehci);
+        clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+        spin_unlock_irqrestore(&tegra->ehci->lock, flags);
+
+        tegra_ehci_power_down(hcd);
+        return 0;
+}
+
+static int tegra_usb_resume(struct usb_hcd *hcd)
+{
+        struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        struct ehci_regs __iomem *hw = ehci->regs;
+        unsigned long val;
+
+        set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+        tegra_ehci_power_up(hcd);
+
+        if (tegra->port_speed > TEGRA_USB_PHY_PORT_SPEED_HIGH) {
+                /* Wait for the phy to detect new devices
+                 * before we restart the controller */
+                msleep(10);
+                goto restart;
+        }
+
+        /* Force the phy to keep data lines in suspend state */
+        tegra_ehci_phy_restore_start(tegra->phy, tegra->port_speed);
+
+        /* Enable host mode */
+        tdi_reset(ehci);
+
+        /* Enable Port Power */
+        val = readl(&hw->port_status[0]);
+        val |= PORT_POWER;
+        writel(val, &hw->port_status[0]);
+        udelay(10);
+
+        /* Check if the phy resume from LP0. When the phy resume from LP0
+         * USB register will be reset. */
+        if (!readl(&hw->async_next)) {
+                /* Program the field PTC based on the saved speed mode */
+                val = readl(&hw->port_status[0]);
+                val &= ~PORT_TEST(~0);
+                if (tegra->port_speed == TEGRA_USB_PHY_PORT_SPEED_HIGH)
+                        val |= PORT_TEST_FORCE;
+                else if (tegra->port_speed == TEGRA_USB_PHY_PORT_SPEED_FULL)
+                        val |= PORT_TEST(6);
+                else if (tegra->port_speed == TEGRA_USB_PHY_PORT_SPEED_LOW)
+                        val |= PORT_TEST(7);
+                writel(val, &hw->port_status[0]);
+                udelay(10);
+
+                /* Disable test mode by setting PTC field to NORMAL_OP */
+                val = readl(&hw->port_status[0]);
+                val &= ~PORT_TEST(~0);
+                writel(val, &hw->port_status[0]);
+                udelay(10);
+        }
+
+        /* Poll until CCS is enabled */
+        if (handshake(ehci, &hw->port_status[0], PORT_CONNECT,
+                                                 PORT_CONNECT, 2000)) {
+                pr_err("%s: timeout waiting for PORT_CONNECT\n", __func__);
+                goto restart;
+        }
+
+        /* Poll until PE is enabled */
+        if (handshake(ehci, &hw->port_status[0], PORT_PE,
+                                                 PORT_PE, 2000)) {
+                pr_err("%s: timeout waiting for USB_PORTSC1_PE\n", __func__);
+                goto restart;
+        }
+
+        /* Clear the PCI status, to avoid an interrupt taken upon resume */
+        val = readl(&hw->status);
+        val |= STS_PCD;
+        writel(val, &hw->status);
+
+        /* Put controller in suspend mode by writing 1 to SUSP bit of PORTSC */
+        val = readl(&hw->port_status[0]);
+        if ((val & PORT_POWER) && (val & PORT_PE)) {
+                val |= PORT_SUSPEND;
+                writel(val, &hw->port_status[0]);
+
+                /* Wait until port suspend completes */
+                if (handshake(ehci, &hw->port_status[0], PORT_SUSPEND,
+                                                         PORT_SUSPEND, 1000)) {
+                        pr_err("%s: timeout waiting for PORT_SUSPEND\n",
+                                                                __func__);
+                        goto restart;
+                }
+        }
+
+        tegra_ehci_phy_restore_end(tegra->phy);
+        return 0;
+
+restart:
+        if (tegra->port_speed <= TEGRA_USB_PHY_PORT_SPEED_HIGH)
+                tegra_ehci_phy_restore_end(tegra->phy);
+
+        tegra_ehci_restart(hcd);
+        return 0;
+}
+
+static void tegra_ehci_shutdown(struct usb_hcd *hcd)
+{
+        struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
+
+        /* ehci_shutdown touches the USB controller registers, make sure
+         * controller has clocks to it */
+        if (!tegra->host_resumed)
+                tegra_ehci_power_up(hcd);
+
+        ehci_shutdown(hcd);
+}
+
+static int tegra_ehci_setup(struct usb_hcd *hcd)
+{
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        int retval;
+
+        /* EHCI registers start at offset 0x100 */
+        ehci->caps = hcd->regs + 0x100;
+        ehci->regs = hcd->regs + 0x100 +
+                HC_LENGTH(readl(&ehci->caps->hc_capbase));
+
+        dbg_hcs_params(ehci, "reset");
+        dbg_hcc_params(ehci, "reset");
+
+        /* cache this readonly data; minimize chip reads */
+        ehci->hcs_params = readl(&ehci->caps->hcs_params);
+
+        /* switch to host mode */
+        hcd->has_tt = 1;
+        ehci_reset(ehci);
+
+        retval = ehci_halt(ehci);
+        if (retval)
+                return retval;
+
+        /* data structure init */
+        retval = ehci_init(hcd);
+        if (retval)
+                return retval;
+
+        ehci->sbrn = 0x20;
+
+        ehci_port_power(ehci, 1);
+        return retval;
+}
+
+#ifdef CONFIG_PM
+static int tegra_ehci_bus_suspend(struct usb_hcd *hcd)
+{
+        struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
+        int error_status = 0;
+
+        error_status = ehci_bus_suspend(hcd);
+        if (!error_status && tegra->power_down_on_bus_suspend) {
+                tegra_usb_suspend(hcd);
+                tegra->bus_suspended = 1;
+        }
+
+        return error_status;
+}
+
+static int tegra_ehci_bus_resume(struct usb_hcd *hcd)
+{
+        struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
+
+        if (tegra->bus_suspended && tegra->power_down_on_bus_suspend) {
+                tegra_usb_resume(hcd);
+                tegra->bus_suspended = 0;
+        }
+
+        tegra_usb_phy_preresume(tegra->phy);
+        tegra->port_resuming = 1;
+        return ehci_bus_resume(hcd);
+}
+#endif
+
+struct temp_buffer {
+        void *kmalloc_ptr;
+        void *old_xfer_buffer;
+        u8 data[0];
+};
+
+static void free_temp_buffer(struct urb *urb)
+{
+        enum dma_data_direction dir;
+        struct temp_buffer *temp;
+
+        if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
+                return;
+
+        dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+
+        temp = container_of(urb->transfer_buffer, struct temp_buffer,
+                            data);
+
+        if (dir == DMA_FROM_DEVICE)
+                memcpy(temp->old_xfer_buffer, temp->data,
+                       urb->transfer_buffer_length);
+        urb->transfer_buffer = temp->old_xfer_buffer;
+        kfree(temp->kmalloc_ptr);
+
+        urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
+}
+
+static int alloc_temp_buffer(struct urb *urb, gfp_t mem_flags)
+{
+        enum dma_data_direction dir;
+        struct temp_buffer *temp, *kmalloc_ptr;
+        size_t kmalloc_size;
+
+        if (urb->num_sgs || urb->sg ||
+            urb->transfer_buffer_length == 0 ||
+            !((uintptr_t)urb->transfer_buffer & (TEGRA_USB_DMA_ALIGN - 1)))
+                return 0;
+
+        dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+
+        /* Allocate a buffer with enough padding for alignment */
+        kmalloc_size = urb->transfer_buffer_length +
+                sizeof(struct temp_buffer) + TEGRA_USB_DMA_ALIGN - 1;
+
+        kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
+        if (!kmalloc_ptr)
+                return -ENOMEM;
+
+        /* Position our struct temp_buffer such that data is aligned */
+        temp = PTR_ALIGN(kmalloc_ptr + 1, TEGRA_USB_DMA_ALIGN) - 1;
+
+        temp->kmalloc_ptr = kmalloc_ptr;
+        temp->old_xfer_buffer = urb->transfer_buffer;
+        if (dir == DMA_TO_DEVICE)
+                memcpy(temp->data, urb->transfer_buffer,
+                       urb->transfer_buffer_length);
+        urb->transfer_buffer = temp->data;
+
+        urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
+
+        return 0;
+}
+
+static int tegra_ehci_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
+                                      gfp_t mem_flags)
+{
+        int ret;
+
+        ret = alloc_temp_buffer(urb, mem_flags);
+        if (ret)
+                return ret;
+
+        ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
+        if (ret)
+                free_temp_buffer(urb);
+
+        return ret;
+}
+
+static void tegra_ehci_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
+{
+        usb_hcd_unmap_urb_for_dma(hcd, urb);
+        free_temp_buffer(urb);
+}
+
+static const struct hc_driver tegra_ehci_hc_driver = {
+        .description            = hcd_name,
+        .product_desc           = "Tegra EHCI Host Controller",
+        .hcd_priv_size          = sizeof(struct ehci_hcd),
+
+        .flags                  = HCD_USB2 | HCD_MEMORY,
+
+        .reset                  = tegra_ehci_setup,
+        .irq                    = ehci_irq,
+
+        .start                  = ehci_run,
+        .stop                   = ehci_stop,
+        .shutdown               = tegra_ehci_shutdown,
+        .urb_enqueue            = ehci_urb_enqueue,
+        .urb_dequeue            = ehci_urb_dequeue,
+        .map_urb_for_dma        = tegra_ehci_map_urb_for_dma,
+        .unmap_urb_for_dma      = tegra_ehci_unmap_urb_for_dma,
+        .endpoint_disable       = ehci_endpoint_disable,
+        .endpoint_reset         = ehci_endpoint_reset,
+        .get_frame_number       = ehci_get_frame,
+        .hub_status_data        = ehci_hub_status_data,
+        .hub_control            = tegra_ehci_hub_control,
+        .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
+#ifdef CONFIG_PM
+        .bus_suspend            = tegra_ehci_bus_suspend,
+        .bus_resume             = tegra_ehci_bus_resume,
+#endif
+        .relinquish_port        = ehci_relinquish_port,
+        .port_handed_over       = ehci_port_handed_over,
+};
+
+static int tegra_ehci_probe(struct platform_device *pdev)
+{
+        struct resource *res;
+        struct usb_hcd *hcd;
+        struct tegra_ehci_hcd *tegra;
+        struct tegra_ehci_platform_data *pdata;
+        int err = 0;
+        int irq;
+        int instance = pdev->id;
+
+        pdata = pdev->dev.platform_data;
+        if (!pdata) {
+                dev_err(&pdev->dev, "Platform data missing\n");
+                return -EINVAL;
+        }
+
+        tegra = kzalloc(sizeof(struct tegra_ehci_hcd), GFP_KERNEL);
+        if (!tegra)
+                return -ENOMEM;
+
+        hcd = usb_create_hcd(&tegra_ehci_hc_driver, &pdev->dev,
+                                        dev_name(&pdev->dev));
+        if (!hcd) {
+                dev_err(&pdev->dev, "Unable to create HCD\n");
+                err = -ENOMEM;
+                goto fail_hcd;
+        }
+
+        platform_set_drvdata(pdev, tegra);
+
+        tegra->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(tegra->clk)) {
+                dev_err(&pdev->dev, "Can't get ehci clock\n");
+                err = PTR_ERR(tegra->clk);
+                goto fail_clk;
+        }
+
+        err = clk_enable(tegra->clk);
+        if (err)
+                goto fail_clken;
+
+        tegra->emc_clk = clk_get(&pdev->dev, "emc");
+        if (IS_ERR(tegra->emc_clk)) {
+                dev_err(&pdev->dev, "Can't get emc clock\n");
+                err = PTR_ERR(tegra->emc_clk);
+                goto fail_emc_clk;
+        }
+
+        clk_enable(tegra->emc_clk);
+        clk_set_rate(tegra->emc_clk, 400000000);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "Failed to get I/O memory\n");
+                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;
+        }
+
+        tegra->phy = tegra_usb_phy_open(instance, hcd->regs, pdata->phy_config,
+                                                TEGRA_USB_PHY_MODE_HOST);
+        if (IS_ERR(tegra->phy)) {
+                dev_err(&pdev->dev, "Failed to open USB phy\n");
+                err = -ENXIO;
+                goto fail_phy;
+        }
+
+        err = tegra_usb_phy_power_on(tegra->phy);
+        if (err) {
+                dev_err(&pdev->dev, "Failed to power on the phy\n");
+                goto fail;
+        }
+
+        tegra->host_resumed = 1;
+        tegra->power_down_on_bus_suspend = pdata->power_down_on_bus_suspend;
+        tegra->ehci = hcd_to_ehci(hcd);
+
+        irq = platform_get_irq(pdev, 0);
+        if (!irq) {
+                dev_err(&pdev->dev, "Failed to get IRQ\n");
+                err = -ENODEV;
+                goto fail;
+        }
+        set_irq_flags(irq, IRQF_VALID);
+
+#ifdef CONFIG_USB_OTG_UTILS
+        if (pdata->operating_mode == TEGRA_USB_OTG) {
+                tegra->transceiver = otg_get_transceiver();
+                if (tegra->transceiver)
+                        otg_set_host(tegra->transceiver, &hcd->self);
+        }
+#endif
+
+        err = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
+        if (err) {
+                dev_err(&pdev->dev, "Failed to add USB HCD\n");
+                goto fail;
+        }
+
+        return err;
+
+fail:
+#ifdef CONFIG_USB_OTG_UTILS
+        if (tegra->transceiver) {
+                otg_set_host(tegra->transceiver, NULL);
+                otg_put_transceiver(tegra->transceiver);
+        }
+#endif
+        tegra_usb_phy_close(tegra->phy);
+fail_phy:
+        iounmap(hcd->regs);
+fail_io:
+        clk_disable(tegra->emc_clk);
+        clk_put(tegra->emc_clk);
+fail_emc_clk:
+        clk_disable(tegra->clk);
+fail_clken:
+        clk_put(tegra->clk);
+fail_clk:
+        usb_put_hcd(hcd);
+fail_hcd:
+        kfree(tegra);
+        return err;
+}
+
+#ifdef CONFIG_PM
+static int tegra_ehci_resume(struct platform_device *pdev)
+{
+        struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev);
+        struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci);
+
+        if (tegra->bus_suspended)
+                return 0;
+
+        return tegra_usb_resume(hcd);
+}
+
+static int tegra_ehci_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev);
+        struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci);
+
+        if (tegra->bus_suspended)
+                return 0;
+
+        if (time_before(jiffies, tegra->ehci->next_statechange))
+                msleep(10);
+
+        return tegra_usb_suspend(hcd);
+}
+#endif
+
+static int tegra_ehci_remove(struct platform_device *pdev)
+{
+        struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev);
+        struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci);
+
+        if (tegra == NULL || hcd == NULL)
+                return -EINVAL;
+
+#ifdef CONFIG_USB_OTG_UTILS
+        if (tegra->transceiver) {
+                otg_set_host(tegra->transceiver, NULL);
+                otg_put_transceiver(tegra->transceiver);
+        }
+#endif
+
+        usb_remove_hcd(hcd);
+        usb_put_hcd(hcd);
+
+        tegra_usb_phy_close(tegra->phy);
+        iounmap(hcd->regs);
+
+        clk_disable(tegra->clk);
+        clk_put(tegra->clk);
+
+        clk_disable(tegra->emc_clk);
+        clk_put(tegra->emc_clk);
+
+        kfree(tegra);
+        return 0;
+}
+
+static void tegra_ehci_hcd_shutdown(struct platform_device *pdev)
+{
+        struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev);
+        struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci);
+
+        if (hcd->driver->shutdown)
+                hcd->driver->shutdown(hcd);
+}
+
+static struct platform_driver tegra_ehci_driver = {
+        .probe          = tegra_ehci_probe,
+        .remove         = tegra_ehci_remove,
+#ifdef CONFIG_PM
+        .suspend        = tegra_ehci_suspend,
+        .resume         = tegra_ehci_resume,
+#endif
+        .shutdown       = tegra_ehci_hcd_shutdown,
+        .driver         = {
+                .name   = "tegra-ehci",
+        }
+};