ehci-msm.c

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/* ehci-msm.c - HSUSB Host Controller Driver Implementation
 *
 * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved.
 *
 * Partly derived from ehci-fsl.c and ehci-hcd.c
 * Copyright (c) 2000-2004 by David Brownell
 * Copyright (c) 2005 MontaVista Software
 *
 * All source code in this file is licensed under the following license except
 * where indicated.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * 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.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you can find it at http://www.fsf.org
 */

#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/pm_runtime.h>

#include <linux/usb/otg.h>
#include <linux/usb/msm_hsusb_hw.h>

#define MSM_USB_BASE (hcd->regs)

static struct usb_phy *phy;

static int ehci_msm_reset(struct usb_hcd *hcd)
{
    struct ehci_hcd *ehci = hcd_to_ehci(hcd);
    int retval;

    ehci->caps = USB_CAPLENGTH;
    hcd->has_tt = 1;

    retval = ehci_setup(hcd);
    if (retval)
        return retval;

    /* bursts of unspecified length. */
    writel(0, USB_AHBBURST);
    /* Use the AHB transactor */
    writel(0, USB_AHBMODE);
    /* Disable streaming mode and select host mode */
    writel(0x13, USB_USBMODE);

    ehci_port_power(ehci, 1);
    return 0;
}

static struct hc_driver msm_hc_driver = {
    .description        = hcd_name,
    .product_desc       = "Qualcomm On-Chip EHCI Host Controller",
    .hcd_priv_size      = sizeof(struct ehci_hcd),

    /*
     * generic hardware linkage
     */
    .irq            = ehci_irq,
    .flags          = HCD_USB2 | HCD_MEMORY,

    .reset          = ehci_msm_reset,
    .start          = ehci_run,

    .stop           = ehci_stop,
    .shutdown       = ehci_shutdown,

    /*
     * managing i/o requests and associated device resources
     */
    .urb_enqueue        = ehci_urb_enqueue,
    .urb_dequeue        = ehci_urb_dequeue,
    .endpoint_disable   = ehci_endpoint_disable,
    .endpoint_reset     = ehci_endpoint_reset,
    .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,

    /*
     * scheduling support
     */
    .get_frame_number   = ehci_get_frame,

    /*
     * root hub support
     */
    .hub_status_data    = ehci_hub_status_data,
    .hub_control        = ehci_hub_control,
    .relinquish_port    = ehci_relinquish_port,
    .port_handed_over   = ehci_port_handed_over,

    /*
     * PM support
     */
    .bus_suspend        = ehci_bus_suspend,
    .bus_resume     = ehci_bus_resume,
};

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 = 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;
    }

    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_hcd:
    usb_put_hcd(hcd);

    return ret;
}

static int __devexit ehci_msm_remove(struct platform_device *pdev)
{
    struct usb_hcd *hcd = platform_get_drvdata(pdev);

    device_init_wakeup(&pdev->dev, 0);
    pm_runtime_disable(&pdev->dev);
    pm_runtime_set_suspended(&pdev->dev);

    otg_set_host(phy->otg, NULL);

    usb_put_hcd(hcd);

    return 0;
}

#ifdef CONFIG_PM
static int ehci_msm_pm_suspend(struct device *dev)
{
    struct usb_hcd *hcd = dev_get_drvdata(dev);
    bool do_wakeup = device_may_wakeup(dev);

    dev_dbg(dev, "ehci-msm PM suspend\n");

    return ehci_suspend(hcd, do_wakeup);
}

static int ehci_msm_pm_resume(struct device *dev)
{
    struct usb_hcd *hcd = dev_get_drvdata(dev);

    dev_dbg(dev, "ehci-msm PM resume\n");
    ehci_resume(hcd, false);

    return 0;
}
#else
#define ehci_msm_pm_suspend NULL
#define ehci_msm_pm_resume  NULL
#endif

static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
    .suspend         = ehci_msm_pm_suspend,
    .resume          = ehci_msm_pm_resume,
};

static struct platform_driver ehci_msm_driver = {
    .probe  = ehci_msm_probe,
    .remove = __devexit_p(ehci_msm_remove),
    .driver = {
           .name = "msm_hsusb_host",
           .pm = &ehci_msm_dev_pm_ops,
    },
};