kernel/arch/avr32/boards/mimc200/flash.c

   1 /*
   2  * MIMC200 board-specific flash initialization
   3  *
   4  * Copyright (C) 2008 Mercury IMC Ltd
   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
  16 #include <mach/smc.h>
  17
  18 static struct smc_timing flash_timing __initdata = {
  19         .ncs_read_setup         = 0,
  20         .nrd_setup              = 15,
  21         .ncs_write_setup        = 0,
  22         .nwe_setup              = 0,
  23
  24         .ncs_read_pulse         = 115,
  25         .nrd_pulse              = 110,
  26         .ncs_write_pulse        = 60,
  27         .nwe_pulse              = 60,
  28
  29         .read_cycle             = 115,
  30         .write_cycle            = 100,
  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 };
  39
  40 /* system flash definition */
  41
  42 static struct mtd_partition flash_parts_system[] = {
  43         {
  44                 .name           = "u-boot",
  45                 .offset         = 0x00000000,
  46                 .size           = 0x00020000,           /* 128 KiB */
  47                 .mask_flags     = MTD_WRITEABLE,
  48         },
  49         {
  50                 .name           = "root",
  51                 .offset         = 0x00020000,
  52                 .size           = 0x007c0000,
  53         },
  54         {
  55                 .name           = "splash",
  56                 .offset         = 0x007e0000,
  57                 .size           = 0x00010000,           /* 64KiB */
  58         },
  59         {
  60                 .name           = "env",
  61                 .offset         = 0x007f0000,
  62                 .size           = 0x00010000,
  63                 .mask_flags     = MTD_WRITEABLE,
  64         },
  65 };
  66
  67 static struct physmap_flash_data flash_system = {
  68         .width          = 2,
  69         .nr_parts       = ARRAY_SIZE(flash_parts_system),
  70         .parts          = flash_parts_system,
  71 };
  72
  73 static struct resource flash_resource_system = {
  74         .start          = 0x00000000,
  75         .end            = 0x007fffff,
  76         .flags          = IORESOURCE_MEM,
  77 };
  78
  79 static struct platform_device flash_device_system = {
  80         .name           = "physmap-flash",
  81         .id             = 0,
  82         .resource       = &flash_resource_system,
  83         .num_resources  = 1,
  84         .dev            = {
  85                 .platform_data = &flash_system,
  86         },
  87 };
  88
  89 /* data flash definition */
  90
  91 static struct mtd_partition flash_parts_data[] = {
  92         {
  93                 .name           = "data",
  94                 .offset         = 0x00000000,
  95                 .size           = 0x00800000,
  96         },
  97 };
  98
  99 static struct physmap_flash_data flash_data = {
 100         .width          = 2,
 101         .nr_parts       = ARRAY_SIZE(flash_parts_data),
 102         .parts          = flash_parts_data,
 103 };
 104
 105 static struct resource flash_resource_data = {
 106         .start          = 0x08000000,
 107         .end            = 0x087fffff,
 108         .flags          = IORESOURCE_MEM,
 109 };
 110
 111 static struct platform_device flash_device_data = {
 112         .name           = "physmap-flash",
 113         .id             = 1,
 114         .resource       = &flash_resource_data,
 115         .num_resources  = 1,
 116         .dev            = {
 117                 .platform_data = &flash_data,
 118         },
 119 };
 120
 121 /* This needs to be called after the SMC has been initialized */
 122 static int __init mimc200_flash_init(void)
 123 {
 124         int ret;
 125
 126         smc_set_timing(&flash_config, &flash_timing);
 127         ret = smc_set_configuration(0, &flash_config);
 128         if (ret < 0) {
 129                 printk(KERN_ERR "mimc200: failed to set 'System' NOR flash timing\n");
 130                 return ret;
 131         }
 132         ret = smc_set_configuration(1, &flash_config);
 133         if (ret < 0) {
 134                 printk(KERN_ERR "mimc200: failed to set 'Data' NOR flash timing\n");
 135                 return ret;
 136         }
 137
 138         platform_device_register(&flash_device_system);
 139         platform_device_register(&flash_device_data);
 140
 141         return 0;
 142 }
 143 device_initcall(mimc200_flash_init);