ci13xxx_imx.c

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/*
 * Copyright 2012 Freescale Semiconductor, Inc.
 * Copyright (C) 2012 Marek Vasut <[email protected]>
 * on behalf of DENX Software Engineering GmbH
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/dma-mapping.h>
#include <linux/usb/chipidea.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>
#include <linux/pinctrl/consumer.h>

#include "ci.h"
#include "ci13xxx_imx.h"

#define pdev_to_phy(pdev) \
    ((struct usb_phy *)platform_get_drvdata(pdev))

struct ci13xxx_imx_data {
    struct device_node *phy_np;
    struct usb_phy *phy;
    struct platform_device *ci_pdev;
    struct clk *clk;
    struct regulator *reg_vbus;
};

static const struct usbmisc_ops *usbmisc_ops;

/* Common functions shared by usbmisc drivers */

int usbmisc_set_ops(const struct usbmisc_ops *ops)
{
    if (usbmisc_ops)
        return -EBUSY;

    usbmisc_ops = ops;

    return 0;
}
EXPORT_SYMBOL_GPL(usbmisc_set_ops);

void usbmisc_unset_ops(const struct usbmisc_ops *ops)
{
    usbmisc_ops = NULL;
}
EXPORT_SYMBOL_GPL(usbmisc_unset_ops);

int usbmisc_get_init_data(struct device *dev, struct usbmisc_usb_device *usbdev)
{
    struct device_node *np = dev->of_node;
    struct of_phandle_args args;
    int ret;

    usbdev->dev = dev;

    ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
                    0, &args);
    if (ret) {
        dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
            ret);
        memset(usbdev, 0, sizeof(*usbdev));
        return ret;
    }
    usbdev->index = args.args[0];
    of_node_put(args.np);

    if (of_find_property(np, "disable-over-current", NULL))
        usbdev->disable_oc = 1;

    return 0;
}
EXPORT_SYMBOL_GPL(usbmisc_get_init_data);

/* End of common functions shared by usbmisc drivers*/

static struct ci13xxx_platform_data ci13xxx_imx_platdata __devinitdata  = {
    .name           = "ci13xxx_imx",
    .flags          = CI13XXX_REQUIRE_TRANSCEIVER |
                  CI13XXX_PULLUP_ON_VBUS |
                  CI13XXX_DISABLE_STREAMING,
    .capoffset      = DEF_CAPOFFSET,
};

static int __devinit ci13xxx_imx_probe(struct platform_device *pdev)
{
    struct ci13xxx_imx_data *data;
    struct platform_device *plat_ci, *phy_pdev;
    struct device_node *phy_np;
    struct resource *res;
    struct regulator *reg_vbus;
    struct pinctrl *pinctrl;
    int ret;

    if (of_find_property(pdev->dev.of_node, "fsl,usbmisc", NULL)
        && !usbmisc_ops)
        return -EPROBE_DEFER;

    data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
    if (!data) {
        dev_err(&pdev->dev, "Failed to allocate CI13xxx-IMX data!\n");
        return -ENOMEM;
    }

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res) {
        dev_err(&pdev->dev, "Can't get device resources!\n");
        return -ENOENT;
    }

    pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
    if (IS_ERR(pinctrl))
        dev_warn(&pdev->dev, "pinctrl get/select failed, err=%ld\n",
            PTR_ERR(pinctrl));

    data->clk = devm_clk_get(&pdev->dev, NULL);
    if (IS_ERR(data->clk)) {
        dev_err(&pdev->dev,
            "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
        return PTR_ERR(data->clk);
    }

    ret = clk_prepare_enable(data->clk);
    if (ret) {
        dev_err(&pdev->dev,
            "Failed to prepare or enable clock, err=%d\n", ret);
        return ret;
    }

    phy_np = of_parse_phandle(pdev->dev.of_node, "fsl,usbphy", 0);
    if (phy_np) {
        data->phy_np = phy_np;
        phy_pdev = of_find_device_by_node(phy_np);
        if (phy_pdev) {
            struct usb_phy *phy;
            phy = pdev_to_phy(phy_pdev);
            if (phy &&
                try_module_get(phy_pdev->dev.driver->owner)) {
                usb_phy_init(phy);
                data->phy = phy;
            }
        }
    }

    /* we only support host now, so enable vbus here */
    reg_vbus = devm_regulator_get(&pdev->dev, "vbus");
    if (!IS_ERR(reg_vbus)) {
        ret = regulator_enable(reg_vbus);
        if (ret) {
            dev_err(&pdev->dev,
                "Failed to enable vbus regulator, err=%d\n",
                ret);
            goto put_np;
        }
        data->reg_vbus = reg_vbus;
    } else {
        reg_vbus = NULL;
    }

    ci13xxx_imx_platdata.phy = data->phy;

    if (!pdev->dev.dma_mask) {
        pdev->dev.dma_mask = devm_kzalloc(&pdev->dev,
                      sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
        if (!pdev->dev.dma_mask) {
            ret = -ENOMEM;
            dev_err(&pdev->dev, "Failed to alloc dma_mask!\n");
            goto err;
        }
        *pdev->dev.dma_mask = DMA_BIT_MASK(32);
        dma_set_coherent_mask(&pdev->dev, *pdev->dev.dma_mask);
    }

    if (usbmisc_ops && usbmisc_ops->init) {
        ret = usbmisc_ops->init(&pdev->dev);
        if (ret) {
            dev_err(&pdev->dev,
                "usbmisc init failed, ret=%d\n", ret);
            goto err;
        }
    }

    plat_ci = ci13xxx_add_device(&pdev->dev,
                pdev->resource, pdev->num_resources,
                &ci13xxx_imx_platdata);
    if (IS_ERR(plat_ci)) {
        ret = PTR_ERR(plat_ci);
        dev_err(&pdev->dev,
            "Can't register ci_hdrc platform device, err=%d\n",
            ret);
        goto err;
    }

    data->ci_pdev = plat_ci;
    platform_set_drvdata(pdev, data);

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

    return 0;

err:
    if (reg_vbus)
        regulator_disable(reg_vbus);
put_np:
    if (phy_np)
        of_node_put(phy_np);
    clk_disable_unprepare(data->clk);
    return ret;
}

static int __devexit ci13xxx_imx_remove(struct platform_device *pdev)
{
    struct ci13xxx_imx_data *data = platform_get_drvdata(pdev);

    pm_runtime_disable(&pdev->dev);
    ci13xxx_remove_device(data->ci_pdev);

    if (data->reg_vbus)
        regulator_disable(data->reg_vbus);

    if (data->phy) {
        usb_phy_shutdown(data->phy);
        module_put(data->phy->dev->driver->owner);
    }

    of_node_put(data->phy_np);

    clk_disable_unprepare(data->clk);

    platform_set_drvdata(pdev, NULL);

    return 0;
}

static const struct of_device_id ci13xxx_imx_dt_ids[] = {
    { .compatible = "fsl,imx27-usb", },
    { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ci13xxx_imx_dt_ids);

static struct platform_driver ci13xxx_imx_driver = {
    .probe = ci13xxx_imx_probe,
    .remove = __devexit_p(ci13xxx_imx_remove),
    .driver = {
        .name = "imx_usb",
        .owner = THIS_MODULE,
        .of_match_table = ci13xxx_imx_dt_ids,
     },
};

module_platform_driver(ci13xxx_imx_driver);

MODULE_ALIAS("platform:imx-usb");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CI13xxx i.MX USB binding");
MODULE_AUTHOR("Marek Vasut <[email protected]>");
MODULE_AUTHOR("Richard Zhao <[email protected]>");