h720x-flash.c

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/*
 * Flash memory access on Hynix GMS30C7201/HMS30C7202 based
 * evaluation boards
 *
 * (C) 2002 Jungjun Kim <[email protected]>
 *     2003 Thomas Gleixner <[email protected]>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <mach/hardware.h>
#include <asm/io.h>

static struct mtd_info *mymtd;

static struct map_info h720x_map = {
    .name =     "H720X",
    .bankwidth =    4,
    .size =     H720X_FLASH_SIZE,
    .phys =     H720X_FLASH_PHYS,
};

static struct mtd_partition h720x_partitions[] = {
        {
                .name = "ArMon",
                .size = 0x00080000,
                .offset = 0,
                .mask_flags = MTD_WRITEABLE
        },{
                .name = "Env",
                .size = 0x00040000,
                .offset = 0x00080000,
                .mask_flags = MTD_WRITEABLE
        },{
                .name = "Kernel",
                .size = 0x00180000,
                .offset = 0x000c0000,
                .mask_flags = MTD_WRITEABLE
        },{
                .name = "Ramdisk",
                .size = 0x00400000,
                .offset = 0x00240000,
                .mask_flags = MTD_WRITEABLE
        },{
                .name = "jffs2",
                .size = MTDPART_SIZ_FULL,
                .offset = MTDPART_OFS_APPEND
        }
};

#define NUM_PARTITIONS ARRAY_SIZE(h720x_partitions)

/*
 * Initialize FLASH support
 */
static int __init h720x_mtd_init(void)
{
    h720x_map.virt = ioremap(h720x_map.phys, h720x_map.size);

    if (!h720x_map.virt) {
        printk(KERN_ERR "H720x-MTD: ioremap failed\n");
        return -EIO;
    }

    simple_map_init(&h720x_map);

    // Probe for flash bankwidth 4
    printk (KERN_INFO "H720x-MTD probing 32bit FLASH\n");
    mymtd = do_map_probe("cfi_probe", &h720x_map);
    if (!mymtd) {
        printk (KERN_INFO "H720x-MTD probing 16bit FLASH\n");
        // Probe for bankwidth 2
        h720x_map.bankwidth = 2;
        mymtd = do_map_probe("cfi_probe", &h720x_map);
    }

    if (mymtd) {
        mymtd->owner = THIS_MODULE;

        mtd_device_parse_register(mymtd, NULL, NULL,
                      h720x_partitions, NUM_PARTITIONS);
        return 0;
    }

    iounmap((void *)h720x_map.virt);
    return -ENXIO;
}

/*
 * Cleanup
 */
static void __exit h720x_mtd_cleanup(void)
{

    if (mymtd) {
        mtd_device_unregister(mymtd);
        map_destroy(mymtd);
    }

    if (h720x_map.virt) {
        iounmap((void *)h720x_map.virt);
        h720x_map.virt = 0;
    }
}


module_init(h720x_mtd_init);
module_exit(h720x_mtd_cleanup);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Thomas Gleixner <[email protected]>");
MODULE_DESCRIPTION("MTD map driver for Hynix evaluation boards");