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flash.c

/*
 * 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 <asm/arch/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);

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