release/src-rt-6.x.4708/linux/linux-2.6.36/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 */
  18 static 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
  33 static 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
  41 static 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
  62 static 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
  71 static 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
  84 static 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
  97 static 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
 118 static 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 }
 139 device_initcall(merisc_flash_init);