dbox2-flash.c

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/*
 * D-Box 2 flash driver
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/errno.h>

/* partition_info gives details on the logical partitions that the split the
 * single flash device into. If the size if zero we use up to the end of the
 * device. */
static struct mtd_partition partition_info[]= {
    {
    .name       = "BR bootloader",
    .size       = 128 * 1024,
    .offset     = 0,
    .mask_flags = MTD_WRITEABLE
    },
    {
    .name       = "FLFS (U-Boot)",
    .size       = 128 * 1024,
    .offset     = MTDPART_OFS_APPEND,
    .mask_flags = 0
    },
    {
    .name       = "Root (SquashFS)",
    .size       = 7040 * 1024,
    .offset     = MTDPART_OFS_APPEND,
    .mask_flags = 0
    },
    {
    .name       = "var (JFFS2)",
    .size       = 896 * 1024,
    .offset     = MTDPART_OFS_APPEND,
    .mask_flags = 0
    },
    {
    .name       = "Flash without bootloader",
    .size       = MTDPART_SIZ_FULL,
    .offset     = 128 * 1024,
    .mask_flags = 0
    },
    {
    .name       = "Complete Flash",
    .size       = MTDPART_SIZ_FULL,
    .offset     = 0,
    .mask_flags = MTD_WRITEABLE
    }
};

#define NUM_PARTITIONS ARRAY_SIZE(partition_info)

#define WINDOW_ADDR 0x10000000
#define WINDOW_SIZE 0x800000

static struct mtd_info *mymtd;


struct map_info dbox2_flash_map = {
    .name       = "D-Box 2 flash memory",
    .size       = WINDOW_SIZE,
    .bankwidth  = 4,
    .phys       = WINDOW_ADDR,
};

static int __init init_dbox2_flash(void)
{
        printk(KERN_NOTICE "D-Box 2 flash driver (size->0x%X mem->0x%X)\n", WINDOW_SIZE, WINDOW_ADDR);
    dbox2_flash_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);

    if (!dbox2_flash_map.virt) {
        printk("Failed to ioremap\n");
        return -EIO;
    }
    simple_map_init(&dbox2_flash_map);

    // Probe for dual Intel 28F320 or dual AMD
    mymtd = do_map_probe("cfi_probe", &dbox2_flash_map);
    if (!mymtd) {
        // Probe for single Intel 28F640
        dbox2_flash_map.bankwidth = 2;

        mymtd = do_map_probe("cfi_probe", &dbox2_flash_map);
    }

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

                /* Create MTD devices for each partition. */
        mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);

        return 0;
    }

    iounmap((void *)dbox2_flash_map.virt);
    return -ENXIO;
}

static void __exit cleanup_dbox2_flash(void)
{
    if (mymtd) {
        mtd_device_unregister(mymtd);
        map_destroy(mymtd);
    }
    if (dbox2_flash_map.virt) {
        iounmap((void *)dbox2_flash_map.virt);
        dbox2_flash_map.virt = 0;
    }
}

module_init(init_dbox2_flash);
module_exit(cleanup_dbox2_flash);


MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kári Davíðsson <[email protected]>, Bastian Blank <[email protected]>, Alexander Wild <[email protected]>");
MODULE_DESCRIPTION("MTD map driver for D-Box 2 board");