flash.c

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/*
 * Merisc board-specific flash initialization
 *
 * Copyright (C) 2008 Martinsson Elektronik AB
 *
 * 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>

/* Will be translated to units of 14.3 ns, rounded up */
static struct smc_timing flash_timing __initdata = {
    .ncs_read_setup     = 1 * 14,
    .nrd_setup      = 5 * 14,
    .ncs_write_setup    = 1 * 14,
    .nwe_setup      = 2 * 14,

    .ncs_read_pulse     = 12 * 14,
    .nrd_pulse      = 7 * 14,
    .ncs_write_pulse    = 8 * 14,
    .nwe_pulse      = 4 * 14,

    .read_cycle     = 14 * 14,
    .write_cycle        = 10 * 14,
};

static struct smc_config flash_config __initdata = {
    .bus_width  = 2,
    .nrd_controlled = 1,
    .nwe_controlled = 1,
    .byte_write = 1,
    .tdf_cycles = 3,
};

static struct mtd_partition flash_0_parts[] = {
    {
        .name       = "boot",
        .offset     = 0x00000000,
        .size       = 0x00060000,
        .mask_flags = 0,
    },
    {
        .name       = "kernel",
        .offset     = 0x00060000,
        .size       = 0x00200000,
        .mask_flags = 0,
    },
    {
        .name       = "root",
        .offset     = 0x00260000,
        .size       = MTDPART_SIZ_FULL,
        .mask_flags = 0,
    },
};

static struct mtd_partition flash_1_parts[] = {
    {
        .name       = "2ndflash",
        .offset     = 0x00000000,
        .size       = MTDPART_SIZ_FULL,
        .mask_flags = 0,
    },
};

static struct physmap_flash_data flash_data[] = {
    {
        .width      = 2,
        .nr_parts   = ARRAY_SIZE(flash_0_parts),
        .parts      = flash_0_parts,
    },
    {
        .width      = 2,
        .nr_parts   = ARRAY_SIZE(flash_1_parts),
        .parts      = flash_1_parts,
    }
};

static struct resource flash_resource[] = {
    {
        .start      = 0x00000000,
        .end        = 0x03ffffff,
        .flags      = IORESOURCE_MEM,
    },
    {
        .start      = 0x04000000,
        .end        = 0x07ffffff,
        .flags      = IORESOURCE_MEM,
    },
};

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

static int __init merisc_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 "Merisc: failed to set NOR flash timing #0\n");
        return ret;
    }

    ret = smc_set_configuration(4, &flash_config);
    if (ret < 0) {
        printk(KERN_ERR "Merisc: failed to set NOR flash timing #1\n");
        return ret;
    }

    platform_device_register(&flash_device[0]);
    platform_device_register(&flash_device[1]);
    return 0;
}
device_initcall(merisc_flash_init);