pata_of_platform.c

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/*
 * OF-platform PATA driver
 *
 * Copyright (c) 2007  MontaVista Software, Inc.
 *                     Anton Vorontsov <[email protected]>
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/ata_platform.h>

static int __devinit pata_of_platform_probe(struct platform_device *ofdev)
{
    int ret;
    struct device_node *dn = ofdev->dev.of_node;
    struct resource io_res;
    struct resource ctl_res;
    struct resource *irq_res;
    unsigned int reg_shift = 0;
    int pio_mode = 0;
    int pio_mask;
    const u32 *prop;

    ret = of_address_to_resource(dn, 0, &io_res);
    if (ret) {
        dev_err(&ofdev->dev, "can't get IO address from "
            "device tree\n");
        return -EINVAL;
    }

    if (of_device_is_compatible(dn, "electra-ide")) {
        /* Altstatus is really at offset 0x3f6 from the primary window
         * on electra-ide. Adjust ctl_res and io_res accordingly.
         */
        ctl_res = io_res;
        ctl_res.start = ctl_res.start+0x3f6;
        io_res.end = ctl_res.start-1;
    } else {
        ret = of_address_to_resource(dn, 1, &ctl_res);
        if (ret) {
            dev_err(&ofdev->dev, "can't get CTL address from "
                "device tree\n");
            return -EINVAL;
        }
    }

    irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
    if (irq_res)
        irq_res->flags = 0;

    prop = of_get_property(dn, "reg-shift", NULL);
    if (prop)
        reg_shift = be32_to_cpup(prop);

    prop = of_get_property(dn, "pio-mode", NULL);
    if (prop) {
        pio_mode = be32_to_cpup(prop);
        if (pio_mode > 6) {
            dev_err(&ofdev->dev, "invalid pio-mode\n");
            return -EINVAL;
        }
    } else {
        dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
    }

    pio_mask = 1 << pio_mode;
    pio_mask |= (1 << pio_mode) - 1;

    return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
                     reg_shift, pio_mask);
}

static int __devexit pata_of_platform_remove(struct platform_device *ofdev)
{
    return __pata_platform_remove(&ofdev->dev);
}

static struct of_device_id pata_of_platform_match[] = {
    { .compatible = "ata-generic", },
    { .compatible = "electra-ide", },
    {},
};
MODULE_DEVICE_TABLE(of, pata_of_platform_match);

static struct platform_driver pata_of_platform_driver = {
    .driver = {
        .name = "pata_of_platform",
        .owner = THIS_MODULE,
        .of_match_table = pata_of_platform_match,
    },
    .probe      = pata_of_platform_probe,
    .remove     = __devexit_p(pata_of_platform_remove),
};

module_platform_driver(pata_of_platform_driver);

MODULE_DESCRIPTION("OF-platform PATA driver");
MODULE_AUTHOR("Anton Vorontsov <[email protected]>");
MODULE_LICENSE("GPL");