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flash.c

/* Handle mapping of the flash on the ASB2303 board
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * 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);

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