flash.c

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/* Handle mapping of the flash on the ASB2303 board
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>

#define ASB2303_PROM_ADDR   0xA0000000  /* Boot PROM */
#define ASB2303_PROM_SIZE   (2 * 1024 * 1024)
#define ASB2303_FLASH_ADDR  0xA4000000  /* System Flash */
#define ASB2303_FLASH_SIZE  (32 * 1024 * 1024)
#define ASB2303_CONFIG_ADDR 0xA6000000  /* System Config EEPROM */
#define ASB2303_CONFIG_SIZE (8 * 1024)

/*
 * default MTD partition table for both main flash devices, expected to be
 * overridden by RedBoot
 */
static struct mtd_partition asb2303_partitions[] = {
    {
        .name       = "Bootloader",
        .size       = 0x00040000,
        .offset     = 0,
        .mask_flags = MTD_CAP_ROM /* force read-only */
    }, {
        .name       = "Kernel",
        .size       = 0x00400000,
        .offset     = 0x00040000,
    }, {
        .name       = "Filesystem",
        .size       = MTDPART_SIZ_FULL,
        .offset     = 0x00440000
    }
};

/*
 * the ASB2303 Boot PROM definition
 */
static struct physmap_flash_data asb2303_bootprom_data = {
    .width      = 2,
    .nr_parts   = 1,
    .parts      = asb2303_partitions,
};

static struct resource asb2303_bootprom_resource = {
    .start      = ASB2303_PROM_ADDR,
    .end        = ASB2303_PROM_ADDR + ASB2303_PROM_SIZE,
    .flags      = IORESOURCE_MEM,
};

static struct platform_device asb2303_bootprom = {
    .name       = "physmap-flash",
    .id     = 0,
    .dev.platform_data = &asb2303_bootprom_data,
    .num_resources  = 1,
    .resource   = &asb2303_bootprom_resource,
};

/*
 * the ASB2303 System Flash definition
 */
static struct physmap_flash_data asb2303_sysflash_data = {
    .width      = 4,
    .nr_parts   = 1,
    .parts      = asb2303_partitions,
};

static struct resource asb2303_sysflash_resource = {
    .start      = ASB2303_FLASH_ADDR,
    .end        = ASB2303_FLASH_ADDR + ASB2303_FLASH_SIZE,
    .flags      = IORESOURCE_MEM,
};

static struct platform_device asb2303_sysflash = {
    .name       = "physmap-flash",
    .id     = 1,
    .dev.platform_data = &asb2303_sysflash_data,
    .num_resources  = 1,
    .resource   = &asb2303_sysflash_resource,
};

/*
 * register the ASB2303 flashes
 */
static int __init asb2303_mtd_init(void)
{
    platform_device_register(&asb2303_bootprom);
    platform_device_register(&asb2303_sysflash);
    return 0;
}

module_init(asb2303_mtd_init);