LXR linux/arch/avr32/boards/merisc/flash.c

   1/*
   2 * Merisc board-specific flash initialization
   3 *
   4 * Copyright (C) 2008 Martinsson Elektronik AB
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10#include <linux/init.h>
  11#include <linux/platform_device.h>
  12#include <linux/mtd/mtd.h>
  13#include <linux/mtd/partitions.h>
  14#include <linux/mtd/physmap.h>
  15#include <mach/smc.h>
  16
  17/* Will be translated to units of 14.3 ns, rounded up */
  18static struct smc_timing flash_timing __initdata = {
  19        .ncs_read_setup         = 1 * 14,
  20        .nrd_setup              = 5 * 14,
  21        .ncs_write_setup        = 1 * 14,
  22        .nwe_setup              = 2 * 14,
  23
  24        .ncs_read_pulse         = 12 * 14,
  25        .nrd_pulse              = 7 * 14,
  26        .ncs_write_pulse        = 8 * 14,
  27        .nwe_pulse              = 4 * 14,
  28
  29        .read_cycle             = 14 * 14,
  30        .write_cycle            = 10 * 14,
  31};
  32
  33static struct smc_config flash_config __initdata = {
  34        .bus_width      = 2,
  35        .nrd_controlled = 1,
  36        .nwe_controlled = 1,
  37        .byte_write     = 1,
  38        .tdf_cycles     = 3,
  39};
  40
  41static struct mtd_partition flash_0_parts[] = {
  42        {
  43                .name           = "boot",
  44                .offset         = 0x00000000,
  45                .size           = 0x00060000,
  46                .mask_flags     = 0,
  47        },
  48        {
  49                .name           = "kernel",
  50                .offset         = 0x00060000,
  51                .size           = 0x00200000,
  52                .mask_flags     = 0,
  53        },
  54        {
  55                .name           = "root",
  56                .offset         = 0x00260000,
  57                .size           = MTDPART_SIZ_FULL,
  58                .mask_flags     = 0,
  59        },
  60};
  61
  62static struct mtd_partition flash_1_parts[] = {
  63        {
  64                .name           = "2ndflash",
  65                .offset         = 0x00000000,
  66                .size           = MTDPART_SIZ_FULL,
  67                .mask_flags     = 0,
  68        },
  69};
  70
  71static struct physmap_flash_data flash_data[] = {
  72        {
  73                .width          = 2,
  74                .nr_parts       = ARRAY_SIZE(flash_0_parts),
  75                .parts          = flash_0_parts,
  76        },
  77        {
  78                .width          = 2,
  79                .nr_parts       = ARRAY_SIZE(flash_1_parts),
  80                .parts          = flash_1_parts,
  81        }
  82};
  83
  84static struct resource flash_resource[] = {
  85        {
  86                .start          = 0x00000000,
  87                .end            = 0x03ffffff,
  88                .flags          = IORESOURCE_MEM,
  89        },
  90        {
  91                .start          = 0x04000000,
  92                .end            = 0x07ffffff,
  93                .flags          = IORESOURCE_MEM,
  94        },
  95};
  96
  97static struct platform_device flash_device[] = {
  98        {
  99                .name           = "physmap-flash",
 100                .id             = 0,
 101                .resource       = &flash_resource[0],
 102                .num_resources  = 1,
 103                .dev            = {
 104                        .platform_data  = &flash_data[0],
 105                },
 106        },
 107        {
 108                .name           = "physmap-flash",
 109                .id             = 1,
 110                .resource       = &flash_resource[1],
 111                .num_resources  = 1,
 112                .dev            = {
 113                        .platform_data  = &flash_data[1],
 114                },
 115        },
 116};
 117
 118static int __init merisc_flash_init(void)
 119{
 120        int ret;
 121        smc_set_timing(&flash_config, &flash_timing);
 122
 123        ret = smc_set_configuration(0, &flash_config);
 124        if (ret < 0) {
 125                printk(KERN_ERR "Merisc: failed to set NOR flash timing #0\n");
 126                return ret;
 127        }
 128
 129        ret = smc_set_configuration(4, &flash_config);
 130        if (ret < 0) {
 131                printk(KERN_ERR "Merisc: failed to set NOR flash timing #1\n");
 132                return ret;
 133        }
 134
 135        platform_device_register(&flash_device[0]);
 136        platform_device_register(&flash_device[1]);
 137        return 0;
 138}
 139device_initcall(merisc_flash_init);
 140