rbtx4939-flash.c

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/*
 * rbtx4939-flash (based on physmap.c)
 *
 * This is a simplified physmap driver with map_init callback function.
 *
 * 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.
 *
 * Copyright (C) 2009 Atsushi Nemoto <[email protected]>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/txx9/rbtx4939.h>

struct rbtx4939_flash_info {
    struct mtd_info *mtd;
    struct map_info map;
};

static int rbtx4939_flash_remove(struct platform_device *dev)
{
    struct rbtx4939_flash_info *info;

    info = platform_get_drvdata(dev);
    if (!info)
        return 0;
    platform_set_drvdata(dev, NULL);

    if (info->mtd) {
        struct rbtx4939_flash_data *pdata = dev->dev.platform_data;

        mtd_device_unregister(info->mtd);
        map_destroy(info->mtd);
    }
    return 0;
}

static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };

static int rbtx4939_flash_probe(struct platform_device *dev)
{
    struct rbtx4939_flash_data *pdata;
    struct rbtx4939_flash_info *info;
    struct resource *res;
    const char **probe_type;
    int err = 0;
    unsigned long size;

    pdata = dev->dev.platform_data;
    if (!pdata)
        return -ENODEV;

    res = platform_get_resource(dev, IORESOURCE_MEM, 0);
    if (!res)
        return -ENODEV;
    info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
                GFP_KERNEL);
    if (!info)
        return -ENOMEM;

    platform_set_drvdata(dev, info);

    size = resource_size(res);
    pr_notice("rbtx4939 platform flash device: %pR\n", res);

    if (!devm_request_mem_region(&dev->dev, res->start, size,
                     dev_name(&dev->dev)))
        return -EBUSY;

    info->map.name = dev_name(&dev->dev);
    info->map.phys = res->start;
    info->map.size = size;
    info->map.bankwidth = pdata->width;

    info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
    if (!info->map.virt)
        return -EBUSY;

    if (pdata->map_init)
        (*pdata->map_init)(&info->map);
    else
        simple_map_init(&info->map);

    probe_type = rom_probe_types;
    for (; !info->mtd && *probe_type; probe_type++)
        info->mtd = do_map_probe(*probe_type, &info->map);
    if (!info->mtd) {
        dev_err(&dev->dev, "map_probe failed\n");
        err = -ENXIO;
        goto err_out;
    }
    info->mtd->owner = THIS_MODULE;
    err = mtd_device_parse_register(info->mtd, NULL, NULL, pdata->parts,
                    pdata->nr_parts);

    if (err)
        goto err_out;
    return 0;

err_out:
    rbtx4939_flash_remove(dev);
    return err;
}

#ifdef CONFIG_PM
static void rbtx4939_flash_shutdown(struct platform_device *dev)
{
    struct rbtx4939_flash_info *info = platform_get_drvdata(dev);

    if (mtd_suspend(info->mtd) == 0)
        mtd_resume(info->mtd);
}
#else
#define rbtx4939_flash_shutdown NULL
#endif

static struct platform_driver rbtx4939_flash_driver = {
    .probe      = rbtx4939_flash_probe,
    .remove     = rbtx4939_flash_remove,
    .shutdown   = rbtx4939_flash_shutdown,
    .driver     = {
        .name   = "rbtx4939-flash",
        .owner  = THIS_MODULE,
    },
};

module_platform_driver(rbtx4939_flash_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("RBTX4939 MTD map driver");
MODULE_ALIAS("platform:rbtx4939-flash");