arch/avr32/boards/favr-32/flash.c

   1 /*
   2  * Favr-32 board-specific flash initialization
   3  *
   4  * Copyright (C) 2008 Atmel Corporation
   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              = 40,
  21         .ncs_write_setup        = 0,
  22         .nwe_setup              = 10,
  23
  24         .ncs_read_pulse         = 80,
  25         .nrd_pulse              = 40,
  26         .ncs_write_pulse        = 65,
  27         .nwe_pulse              = 55,
  28
  29         .read_cycle             = 120,
  30         .write_cycle            = 120,
  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 static struct mtd_partition flash_parts[] = {
  41         {
  42                 .name           = "u-boot",
  43                 .offset         = 0x00000000,
  44                 .size           = 0x00020000,           /* 128 KiB */
  45                 .mask_flags     = MTD_WRITEABLE,
  46         },
  47         {
  48                 .name           = "root",
  49                 .offset         = 0x00020000,
  50                 .size           = 0x007d0000,
  51         },
  52         {
  53                 .name           = "env",
  54                 .offset         = 0x007f0000,
  55                 .size           = 0x00010000,
  56                 .mask_flags     = MTD_WRITEABLE,
  57         },
  58 };
  59
  60 static struct physmap_flash_data flash_data = {
  61         .width          = 2,
  62         .nr_parts       = ARRAY_SIZE(flash_parts),
  63         .parts          = flash_parts,
  64 };
  65
  66 static struct resource flash_resource = {
  67         .start          = 0x00000000,
  68         .end            = 0x007fffff,
  69         .flags          = IORESOURCE_MEM,
  70 };
  71
  72 static struct platform_device flash_device = {
  73         .name           = "physmap-flash",
  74         .id             = 0,
  75         .resource       = &flash_resource,
  76         .num_resources  = 1,
  77         .dev            = {
  78                 .platform_data = &flash_data,
  79         },
  80 };
  81
  82 /* This needs to be called after the SMC has been initialized */
  83 static int __init favr32_flash_init(void)
  84 {
  85         int ret;
  86
  87         smc_set_timing(&flash_config, &flash_timing);
  88         ret = smc_set_configuration(0, &flash_config);
  89         if (ret < 0) {
  90                 printk(KERN_ERR "Favr-32: failed to set NOR flash timing\n");
  91                 return ret;
  92         }
  93
  94         platform_device_register(&flash_device);
  95
  96         return 0;
  97 }
  98 device_initcall(favr32_flash_init);