arch/avr32/boards/atstk1000/flash.c

   1 /*
   2  * ATSTK1000 board-specific flash initialization
   3  *
   4  * Copyright (C) 2005-2006 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 <asm/arch/smc.h>
  17
  18 static struct smc_config flash_config __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         .bus_width              = 2,
  33         .nrd_controlled         = 1,
  34         .nwe_controlled         = 1,
  35         .byte_write             = 1,
  36 };
  37
  38 static struct mtd_partition flash_parts[] = {
  39         {
  40                 .name           = "u-boot",
  41                 .offset         = 0x00000000,
  42                 .size           = 0x00020000,           /* 128 KiB */
  43                 .mask_flags     = MTD_WRITEABLE,
  44         },
  45         {
  46                 .name           = "root",
  47                 .offset         = 0x00020000,
  48                 .size           = 0x007d0000,
  49         },
  50         {
  51                 .name           = "env",
  52                 .offset         = 0x007f0000,
  53                 .size           = 0x00010000,
  54                 .mask_flags     = MTD_WRITEABLE,
  55         },
  56 };
  57
  58 static struct physmap_flash_data flash_data = {
  59         .width          = 2,
  60         .nr_parts       = ARRAY_SIZE(flash_parts),
  61         .parts          = flash_parts,
  62 };
  63
  64 static struct resource flash_resource = {
  65         .start          = 0x00000000,
  66         .end            = 0x007fffff,
  67         .flags          = IORESOURCE_MEM,
  68 };
  69
  70 static struct platform_device flash_device = {
  71         .name           = "physmap-flash",
  72         .id             = 0,
  73         .resource       = &flash_resource,
  74         .num_resources  = 1,
  75         .dev            = {
  76                 .platform_data = &flash_data,
  77         },
  78 };
  79
  80 /* This needs to be called after the SMC has been initialized */
  81 static int __init atstk1000_flash_init(void)
  82 {
  83         int ret;
  84
  85         ret = smc_set_configuration(0, &flash_config);
  86         if (ret < 0) {
  87                 printk(KERN_ERR "atstk1000: failed to set NOR flash timing\n");
  88                 return ret;
  89         }
  90
  91         platform_device_register(&flash_device);
  92
  93         return 0;
  94 }
  95 device_initcall(atstk1000_flash_init);