flash.c

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/*
 * Favr-32 board-specific flash initialization
 *
 * Copyright (C) 2008 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>

#include <mach/smc.h>

static struct smc_timing flash_timing __initdata = {
    .ncs_read_setup     = 0,
    .nrd_setup      = 40,
    .ncs_write_setup    = 0,
    .nwe_setup      = 10,

    .ncs_read_pulse     = 80,
    .nrd_pulse      = 40,
    .ncs_write_pulse    = 65,
    .nwe_pulse      = 55,

    .read_cycle     = 120,
    .write_cycle        = 120,
};

static struct smc_config flash_config __initdata = {
    .bus_width      = 2,
    .nrd_controlled     = 1,
    .nwe_controlled     = 1,
    .byte_write     = 1,
};

static struct mtd_partition flash_parts[] = {
    {
        .name           = "u-boot",
        .offset         = 0x00000000,
        .size           = 0x00020000,           /* 128 KiB */
        .mask_flags     = MTD_WRITEABLE,
    },
    {
        .name           = "root",
        .offset         = 0x00020000,
        .size           = 0x007d0000,
    },
    {
        .name           = "env",
        .offset         = 0x007f0000,
        .size           = 0x00010000,
        .mask_flags     = MTD_WRITEABLE,
    },
};

static struct physmap_flash_data flash_data = {
    .width      = 2,
    .nr_parts   = ARRAY_SIZE(flash_parts),
    .parts      = flash_parts,
};

static struct resource flash_resource = {
    .start      = 0x00000000,
    .end        = 0x007fffff,
    .flags      = IORESOURCE_MEM,
};

static struct platform_device flash_device = {
    .name       = "physmap-flash",
    .id     = 0,
    .resource   = &flash_resource,
    .num_resources  = 1,
    .dev        = {
        .platform_data = &flash_data,
    },
};

/* This needs to be called after the SMC has been initialized */
static int __init favr32_flash_init(void)
{
    int ret;

    smc_set_timing(&flash_config, &flash_timing);
    ret = smc_set_configuration(0, &flash_config);
    if (ret < 0) {
        printk(KERN_ERR "Favr-32: failed to set NOR flash timing\n");
        return ret;
    }

    platform_device_register(&flash_device);

    return 0;
}
device_initcall(favr32_flash_init);