ohci-jz4740.c

Go to the documentation of this file.

/*
 *  Copyright (C) 2010, Lars-Peter Clausen <[email protected]>
 *
 *  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.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>

struct jz4740_ohci_hcd {
    struct ohci_hcd ohci_hcd;

    struct regulator *vbus;
    bool vbus_enabled;
    struct clk *clk;
};

static inline struct jz4740_ohci_hcd *hcd_to_jz4740_hcd(struct usb_hcd *hcd)
{
    return (struct jz4740_ohci_hcd *)(hcd->hcd_priv);
}

static inline struct usb_hcd *jz4740_hcd_to_hcd(struct jz4740_ohci_hcd *jz4740_ohci)
{
    return container_of((void *)jz4740_ohci, struct usb_hcd, hcd_priv);
}

static int ohci_jz4740_start(struct usb_hcd *hcd)
{
    struct ohci_hcd *ohci = hcd_to_ohci(hcd);
    int ret;

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

    ohci->num_ports = 1;

    ret = ohci_run(ohci);
    if (ret < 0) {
        dev_err(hcd->self.controller, "Can not start %s",
            hcd->self.bus_name);
        ohci_stop(hcd);
        return ret;
    }
    return 0;
}

static int ohci_jz4740_set_vbus_power(struct jz4740_ohci_hcd *jz4740_ohci,
    bool enabled)
{
    int ret = 0;

    if (!jz4740_ohci->vbus)
        return 0;

    if (enabled && !jz4740_ohci->vbus_enabled) {
        ret = regulator_enable(jz4740_ohci->vbus);
        if (ret)
            dev_err(jz4740_hcd_to_hcd(jz4740_ohci)->self.controller,
                "Could not power vbus\n");
    } else if (!enabled && jz4740_ohci->vbus_enabled) {
        ret = regulator_disable(jz4740_ohci->vbus);
    }

    if (ret == 0)
        jz4740_ohci->vbus_enabled = enabled;

    return ret;
}

static int ohci_jz4740_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
    u16 wIndex, char *buf, u16 wLength)
{
    struct jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);
    int ret;

    switch (typeReq) {
    case SetHubFeature:
        if (wValue == USB_PORT_FEAT_POWER)
            ret = ohci_jz4740_set_vbus_power(jz4740_ohci, true);
        break;
    case ClearHubFeature:
        if (wValue == USB_PORT_FEAT_POWER)
            ret = ohci_jz4740_set_vbus_power(jz4740_ohci, false);
        break;
    }

    if (ret)
        return ret;

    return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
}


static const struct hc_driver ohci_jz4740_hc_driver = {
    .description =      hcd_name,
    .product_desc =     "JZ4740 OHCI",
    .hcd_priv_size =    sizeof(struct jz4740_ohci_hcd),

    /*
     * generic hardware linkage
     */
    .irq =          ohci_irq,
    .flags =        HCD_USB11 | HCD_MEMORY,

    /*
     * basic lifecycle operations
     */
    .start =        ohci_jz4740_start,
    .stop =         ohci_stop,
    .shutdown =     ohci_shutdown,

    /*
     * managing i/o requests and associated device resources
     */
    .urb_enqueue =      ohci_urb_enqueue,
    .urb_dequeue =      ohci_urb_dequeue,
    .endpoint_disable = ohci_endpoint_disable,

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

    /*
     * root hub support
     */
    .hub_status_data =  ohci_hub_status_data,
    .hub_control =      ohci_jz4740_hub_control,
#ifdef  CONFIG_PM
    .bus_suspend =      ohci_bus_suspend,
    .bus_resume =       ohci_bus_resume,
#endif
    .start_port_reset = ohci_start_port_reset,
};


static __devinit int jz4740_ohci_probe(struct platform_device *pdev)
{
    int ret;
    struct usb_hcd *hcd;
    struct jz4740_ohci_hcd *jz4740_ohci;
    struct resource *res;
    int irq;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

    if (!res) {
        dev_err(&pdev->dev, "Failed to get platform resource\n");
        return -ENOENT;
    }

    irq = platform_get_irq(pdev, 0);
    if (irq < 0) {
        dev_err(&pdev->dev, "Failed to get platform irq\n");
        return irq;
    }

    hcd = usb_create_hcd(&ohci_jz4740_hc_driver, &pdev->dev, "jz4740");
    if (!hcd) {
        dev_err(&pdev->dev, "Failed to create hcd.\n");
        return -ENOMEM;
    }

    jz4740_ohci = hcd_to_jz4740_hcd(hcd);

    res = request_mem_region(res->start, resource_size(res), hcd_name);
    if (!res) {
        dev_err(&pdev->dev, "Failed to request mem region.\n");
        ret = -EBUSY;
        goto err_free;
    }

    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 ioremap registers.\n");
        ret = -EBUSY;
        goto err_release_mem;
    }

    jz4740_ohci->clk = clk_get(&pdev->dev, "uhc");
    if (IS_ERR(jz4740_ohci->clk)) {
        ret = PTR_ERR(jz4740_ohci->clk);
        dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
        goto err_iounmap;
    }

    jz4740_ohci->vbus = regulator_get(&pdev->dev, "vbus");
    if (IS_ERR(jz4740_ohci->vbus))
        jz4740_ohci->vbus = NULL;


    clk_set_rate(jz4740_ohci->clk, 48000000);
    clk_enable(jz4740_ohci->clk);
    if (jz4740_ohci->vbus)
        ohci_jz4740_set_vbus_power(jz4740_ohci, true);

    platform_set_drvdata(pdev, hcd);

    ohci_hcd_init(hcd_to_ohci(hcd));

    ret = usb_add_hcd(hcd, irq, 0);
    if (ret) {
        dev_err(&pdev->dev, "Failed to add hcd: %d\n", ret);
        goto err_disable;
    }

    return 0;

err_disable:
    platform_set_drvdata(pdev, NULL);
    if (jz4740_ohci->vbus) {
        regulator_disable(jz4740_ohci->vbus);
        regulator_put(jz4740_ohci->vbus);
    }
    clk_disable(jz4740_ohci->clk);

    clk_put(jz4740_ohci->clk);
err_iounmap:
    iounmap(hcd->regs);
err_release_mem:
    release_mem_region(res->start, resource_size(res));
err_free:
    usb_put_hcd(hcd);

    return ret;
}

static __devexit int jz4740_ohci_remove(struct platform_device *pdev)
{
    struct usb_hcd *hcd = platform_get_drvdata(pdev);
    struct jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);

    usb_remove_hcd(hcd);

    platform_set_drvdata(pdev, NULL);

    if (jz4740_ohci->vbus) {
        regulator_disable(jz4740_ohci->vbus);
        regulator_put(jz4740_ohci->vbus);
    }

    clk_disable(jz4740_ohci->clk);
    clk_put(jz4740_ohci->clk);

    iounmap(hcd->regs);
    release_mem_region(hcd->rsrc_start, hcd->rsrc_len);

    usb_put_hcd(hcd);

    return 0;
}

static struct platform_driver ohci_hcd_jz4740_driver = {
    .probe = jz4740_ohci_probe,
    .remove = __devexit_p(jz4740_ohci_remove),
    .driver = {
        .name = "jz4740-ohci",
        .owner = THIS_MODULE,
    },
};

MODULE_ALIAS("platform:jz4740-ohci");