pxa2xx-flash.c

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/*
 * Map driver for Intel XScale PXA2xx platforms.
 *
 * Author:  Nicolas Pitre
 * Copyright:   (C) 2001 MontaVista Software Inc.
 *
 * 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/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

#include <asm/io.h>
#include <mach/hardware.h>

#include <asm/mach/flash.h>

#define CACHELINESIZE   32

static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
                      ssize_t len)
{
    unsigned long start = (unsigned long)map->cached + from;
    unsigned long end = start + len;

    start &= ~(CACHELINESIZE - 1);
    while (start < end) {
        /* invalidate D cache line */
        asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
        start += CACHELINESIZE;
    }
}

struct pxa2xx_flash_info {
    struct mtd_info     *mtd;
    struct map_info     map;
};


static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };


static int __devinit pxa2xx_flash_probe(struct platform_device *pdev)
{
    struct flash_platform_data *flash = pdev->dev.platform_data;
    struct pxa2xx_flash_info *info;
    struct resource *res;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res)
        return -ENODEV;

    info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
    if (!info)
        return -ENOMEM;

    info->map.name = (char *) flash->name;
    info->map.bankwidth = flash->width;
    info->map.phys = res->start;
    info->map.size = resource_size(res);

    info->map.virt = ioremap(info->map.phys, info->map.size);
    if (!info->map.virt) {
        printk(KERN_WARNING "Failed to ioremap %s\n",
               info->map.name);
        return -ENOMEM;
    }
    info->map.cached =
        ioremap_cached(info->map.phys, info->map.size);
    if (!info->map.cached)
        printk(KERN_WARNING "Failed to ioremap cached %s\n",
               info->map.name);
    info->map.inval_cache = pxa2xx_map_inval_cache;
    simple_map_init(&info->map);

    printk(KERN_NOTICE
           "Probing %s at physical address 0x%08lx"
           " (%d-bit bankwidth)\n",
           info->map.name, (unsigned long)info->map.phys,
           info->map.bankwidth * 8);

    info->mtd = do_map_probe(flash->map_name, &info->map);

    if (!info->mtd) {
        iounmap((void *)info->map.virt);
        if (info->map.cached)
            iounmap(info->map.cached);
        return -EIO;
    }
    info->mtd->owner = THIS_MODULE;

    mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
                  flash->nr_parts);

    platform_set_drvdata(pdev, info);
    return 0;
}

static int __devexit pxa2xx_flash_remove(struct platform_device *dev)
{
    struct pxa2xx_flash_info *info = platform_get_drvdata(dev);

    platform_set_drvdata(dev, NULL);

    mtd_device_unregister(info->mtd);

    map_destroy(info->mtd);
    iounmap(info->map.virt);
    if (info->map.cached)
        iounmap(info->map.cached);
    kfree(info);
    return 0;
}

#ifdef CONFIG_PM
static void pxa2xx_flash_shutdown(struct platform_device *dev)
{
    struct pxa2xx_flash_info *info = platform_get_drvdata(dev);

    if (info && mtd_suspend(info->mtd) == 0)
        mtd_resume(info->mtd);
}
#else
#define pxa2xx_flash_shutdown NULL
#endif

static struct platform_driver pxa2xx_flash_driver = {
    .driver = {
        .name       = "pxa2xx-flash",
        .owner      = THIS_MODULE,
    },
    .probe      = pxa2xx_flash_probe,
    .remove     = __devexit_p(pxa2xx_flash_remove),
    .shutdown   = pxa2xx_flash_shutdown,
};

module_platform_driver(pxa2xx_flash_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nicolas Pitre <[email protected]>");
MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");