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flash.c

/*
 * 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);

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