release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mn10300/unit-asb2303/flash.c

   1 /* Handle mapping of the flash on the ASB2303 board
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #include <linux/init.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/mtd/partitions.h>
  14 #include <linux/mtd/physmap.h>
  15
  16 #define ASB2303_PROM_ADDR       0xA0000000      /* Boot PROM */
  17 #define ASB2303_PROM_SIZE       (2 * 1024 * 1024)
  18 #define ASB2303_FLASH_ADDR      0xA4000000      /* System Flash */
  19 #define ASB2303_FLASH_SIZE      (32 * 1024 * 1024)
  20 #define ASB2303_CONFIG_ADDR     0xA6000000      /* System Config EEPROM */
  21 #define ASB2303_CONFIG_SIZE     (8 * 1024)
  22
  23 /*
  24  * default MTD partition table for both main flash devices, expected to be
  25  * overridden by RedBoot
  26  */
  27 static struct mtd_partition asb2303_partitions[] = {
  28         {
  29                 .name           = "Bootloader",
  30                 .size           = 0x00040000,
  31                 .offset         = 0,
  32                 .mask_flags     = MTD_CAP_ROM /* force read-only */
  33         }, {
  34                 .name           = "Kernel",
  35                 .size           = 0x00400000,
  36                 .offset         = 0x00040000,
  37         }, {
  38                 .name           = "Filesystem",
  39                 .size           = MTDPART_SIZ_FULL,
  40                 .offset         = 0x00440000
  41         }
  42 };
  43
  44 /*
  45  * the ASB2303 Boot PROM definition
  46  */
  47 static struct physmap_flash_data asb2303_bootprom_data = {
  48         .width          = 2,
  49         .nr_parts       = 1,
  50         .parts          = asb2303_partitions,
  51 };
  52
  53 static struct resource asb2303_bootprom_resource = {
  54         .start          = ASB2303_PROM_ADDR,
  55         .end            = ASB2303_PROM_ADDR + ASB2303_PROM_SIZE,
  56         .flags          = IORESOURCE_MEM,
  57 };
  58
  59 static struct platform_device asb2303_bootprom = {
  60         .name           = "physmap-flash",
  61         .id             = 0,
  62         .dev.platform_data = &asb2303_bootprom_data,
  63         .num_resources  = 1,
  64         .resource       = &asb2303_bootprom_resource,
  65 };
  66
  67 /*
  68  * the ASB2303 System Flash definition
  69  */
  70 static struct physmap_flash_data asb2303_sysflash_data = {
  71         .width          = 4,
  72         .nr_parts       = 1,
  73         .parts          = asb2303_partitions,
  74 };
  75
  76 static struct resource asb2303_sysflash_resource = {
  77         .start          = ASB2303_FLASH_ADDR,
  78         .end            = ASB2303_FLASH_ADDR + ASB2303_FLASH_SIZE,
  79         .flags          = IORESOURCE_MEM,
  80 };
  81
  82 static struct platform_device asb2303_sysflash = {
  83         .name           = "physmap-flash",
  84         .id             = 1,
  85         .dev.platform_data = &asb2303_sysflash_data,
  86         .num_resources  = 1,
  87         .resource       = &asb2303_sysflash_resource,
  88 };
  89
  90 /*
  91  * register the ASB2303 flashes
  92  */
  93 static int __init asb2303_mtd_init(void)
  94 {
  95         platform_device_register(&asb2303_bootprom);
  96         platform_device_register(&asb2303_sysflash);
  97         return 0;
  98 }
  99
 100 module_init(asb2303_mtd_init);