ide_platform.c

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/*
 * Platform IDE driver
 *
 * Copyright (C) 2007 MontaVista Software
 *
 * Maintainer: Kumar Gala <[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.
 */

#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/ide.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/ata_platform.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/io.h>

static void __devinit plat_ide_setup_ports(struct ide_hw *hw,
                       void __iomem *base,
                       void __iomem *ctrl,
                       struct pata_platform_info *pdata,
                       int irq)
{
    unsigned long port = (unsigned long)base;
    int i;

    hw->io_ports.data_addr = port;

    port += (1 << pdata->ioport_shift);
    for (i = 1; i <= 7;
         i++, port += (1 << pdata->ioport_shift))
        hw->io_ports_array[i] = port;

    hw->io_ports.ctl_addr = (unsigned long)ctrl;

    hw->irq = irq;
}

static const struct ide_port_info platform_ide_port_info = {
    .host_flags     = IDE_HFLAG_NO_DMA,
    .chipset        = ide_generic,
};

static int __devinit plat_ide_probe(struct platform_device *pdev)
{
    struct resource *res_base, *res_alt, *res_irq;
    void __iomem *base, *alt_base;
    struct pata_platform_info *pdata;
    struct ide_host *host;
    int ret = 0, mmio = 0;
    struct ide_hw hw, *hws[] = { &hw };
    struct ide_port_info d = platform_ide_port_info;

    pdata = pdev->dev.platform_data;

    /* get a pointer to the register memory */
    res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
    res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);

    if (!res_base || !res_alt) {
        res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
        if (!res_base || !res_alt) {
            ret = -ENOMEM;
            goto out;
        }
        mmio = 1;
    }

    res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
    if (!res_irq) {
        ret = -EINVAL;
        goto out;
    }

    if (mmio) {
        base = devm_ioremap(&pdev->dev,
            res_base->start, resource_size(res_base));
        alt_base = devm_ioremap(&pdev->dev,
            res_alt->start, resource_size(res_alt));
    } else {
        base = devm_ioport_map(&pdev->dev,
            res_base->start, resource_size(res_base));
        alt_base = devm_ioport_map(&pdev->dev,
            res_alt->start, resource_size(res_alt));
    }

    memset(&hw, 0, sizeof(hw));
    plat_ide_setup_ports(&hw, base, alt_base, pdata, res_irq->start);
    hw.dev = &pdev->dev;

    d.irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
    if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
        d.irq_flags |= IRQF_SHARED;

    if (mmio)
        d.host_flags |= IDE_HFLAG_MMIO;

    ret = ide_host_add(&d, hws, 1, &host);
    if (ret)
        goto out;

    platform_set_drvdata(pdev, host);

    return 0;

out:
    return ret;
}

static int __devexit plat_ide_remove(struct platform_device *pdev)
{
    struct ide_host *host = dev_get_drvdata(&pdev->dev);

    ide_host_remove(host);

    return 0;
}

static struct platform_driver platform_ide_driver = {
    .driver = {
        .name = "pata_platform",
        .owner = THIS_MODULE,
    },
    .probe = plat_ide_probe,
    .remove = __devexit_p(plat_ide_remove),
};

static int __init platform_ide_init(void)
{
    return platform_driver_register(&platform_ide_driver);
}

static void __exit platform_ide_exit(void)
{
    platform_driver_unregister(&platform_ide_driver);
}

MODULE_DESCRIPTION("Platform IDE driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pata_platform");

module_init(platform_ide_init);
module_exit(platform_ide_exit);