solutionengine.c

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/*
 * Flash and EPROM on Hitachi Solution Engine and similar boards.
 *
 * (C) 2001 Red Hat, Inc.
 *
 * GPL'd
 */

#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>

static struct mtd_info *flash_mtd;
static struct mtd_info *eprom_mtd;

struct map_info soleng_eprom_map = {
    .name = "Solution Engine EPROM",
    .size = 0x400000,
    .bankwidth = 4,
};

struct map_info soleng_flash_map = {
    .name = "Solution Engine FLASH",
    .size = 0x400000,
    .bankwidth = 4,
};

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

#ifdef CONFIG_MTD_SUPERH_RESERVE
static struct mtd_partition superh_se_partitions[] = {
    /* Reserved for boot code, read-only */
    {
        .name = "flash_boot",
        .offset = 0x00000000,
        .size = CONFIG_MTD_SUPERH_RESERVE,
        .mask_flags = MTD_WRITEABLE,
    },
    /* All else is writable (e.g. JFFS) */
    {
        .name = "Flash FS",
        .offset = MTDPART_OFS_NXTBLK,
        .size = MTDPART_SIZ_FULL,
    }
};
#define NUM_PARTITIONS ARRAY_SIZE(superh_se_partitions)
#else
#define superh_se_partitions NULL
#define NUM_PARTITIONS 0
#endif /* CONFIG_MTD_SUPERH_RESERVE */

static int __init init_soleng_maps(void)
{
    /* First probe at offset 0 */
    soleng_flash_map.phys = 0;
    soleng_flash_map.virt = (void __iomem *)P2SEGADDR(0);
    soleng_eprom_map.phys = 0x01000000;
    soleng_eprom_map.virt = (void __iomem *)P1SEGADDR(0x01000000);
    simple_map_init(&soleng_eprom_map);
    simple_map_init(&soleng_flash_map);

    printk(KERN_NOTICE "Probing for flash chips at 0x00000000:\n");
    flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
    if (!flash_mtd) {
        /* Not there. Try swapping */
        printk(KERN_NOTICE "Probing for flash chips at 0x01000000:\n");
        soleng_flash_map.phys = 0x01000000;
        soleng_flash_map.virt = P2SEGADDR(0x01000000);
        soleng_eprom_map.phys = 0;
        soleng_eprom_map.virt = P1SEGADDR(0);
        flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
        if (!flash_mtd) {
            /* Eep. */
            printk(KERN_NOTICE "Flash chips not detected at either possible location.\n");
            return -ENXIO;
        }
    }
    printk(KERN_NOTICE "Solution Engine: Flash at 0x%08lx, EPROM at 0x%08lx\n",
           soleng_flash_map.phys & 0x1fffffff,
           soleng_eprom_map.phys & 0x1fffffff);
    flash_mtd->owner = THIS_MODULE;

    eprom_mtd = do_map_probe("map_rom", &soleng_eprom_map);
    if (eprom_mtd) {
        eprom_mtd->owner = THIS_MODULE;
        mtd_device_register(eprom_mtd, NULL, 0);
    }

    mtd_device_parse_register(flash_mtd, probes, NULL,
                  superh_se_partitions, NUM_PARTITIONS);

    return 0;
}

static void __exit cleanup_soleng_maps(void)
{
    if (eprom_mtd) {
        mtd_device_unregister(eprom_mtd);
        map_destroy(eprom_mtd);
    }

    mtd_device_unregister(flash_mtd);
    map_destroy(flash_mtd);
}

module_init(init_soleng_maps);
module_exit(cleanup_soleng_maps);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <[email protected]>");
MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");