drivers/mtd/maps/arctic-mtd.c

   1 /*
   2  * $Id: arctic-mtd.c,v 1.13 2004/11/04 13:24:14 gleixner Exp $
   3  *
   4  * drivers/mtd/maps/arctic-mtd.c MTD mappings and partition tables for
   5  *                              IBM 405LP Arctic boards.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  *
  21  * Copyright (C) 2002, International Business Machines Corporation
  22  * All Rights Reserved.
  23  *
  24  * Bishop Brock
  25  * IBM Research, Austin Center for Low-Power Computing
  26  * bcbrock@us.ibm.com
  27  * March 2002
  28  *
  29  * modified for Arctic by,
  30  * David Gibson
  31  * IBM OzLabs, Canberra, Australia
  32  * <arctic@gibson.dropbear.id.au>
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/types.h>
  38 #include <linux/init.h>
  39
  40 #include <linux/mtd/mtd.h>
  41 #include <linux/mtd/map.h>
  42 #include <linux/mtd/partitions.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/ibm4xx.h>
  46
  47 /*
  48  * 0 : 0xFE00 0000 - 0xFEFF FFFF : Filesystem 1 (16MiB)
  49  * 1 : 0xFF00 0000 - 0xFF4F FFFF : kernel (5.12MiB)
  50  * 2 : 0xFF50 0000 - 0xFFF5 FFFF : Filesystem 2 (10.624MiB) (if non-XIP)
  51  * 3 : 0xFFF6 0000 - 0xFFFF FFFF : PIBS Firmware (640KiB)
  52  */
  53
  54 #define FFS1_SIZE       0x01000000 /* 16MiB */
  55 #define KERNEL_SIZE     0x00500000 /* 5.12MiB */
  56 #define FFS2_SIZE       0x00a60000 /* 10.624MiB */
  57 #define FIRMWARE_SIZE   0x000a0000 /* 640KiB */
  58
  59
  60 #define NAME            "Arctic Linux Flash"
  61 #define PADDR           SUBZERO_BOOTFLASH_PADDR
  62 #define BUSWIDTH        2
  63 #define SIZE            SUBZERO_BOOTFLASH_SIZE
  64 #define PARTITIONS      4
  65
  66 /* Flash memories on these boards are memory resources, accessed big-endian. */
  67
  68 {
  69   /* do nothing for now */
  70 }
  71
  72 static struct map_info arctic_mtd_map = {
  73         .name           = NAME,
  74         .size           = SIZE,
  75         .bankwidth      = BUSWIDTH,
  76         .phys           = PADDR,
  77 };
  78
  79 static struct mtd_info *arctic_mtd;
  80
  81 static struct mtd_partition arctic_partitions[PARTITIONS] = {
  82         { .name         = "Filesystem",
  83           .size         = FFS1_SIZE,
  84           .offset       = 0,},
  85         { .name         = "Kernel",
  86           .size         = KERNEL_SIZE,
  87           .offset       = FFS1_SIZE,},
  88         { .name         = "Filesystem",
  89           .size         = FFS2_SIZE,
  90           .offset       = FFS1_SIZE + KERNEL_SIZE,},
  91         { .name         = "Firmware",
  92           .size         = FIRMWARE_SIZE,
  93           .offset       = SUBZERO_BOOTFLASH_SIZE - FIRMWARE_SIZE,},
  94 };
  95
  96 static int __init
  97 init_arctic_mtd(void)
  98 {
  99         printk("%s: 0x%08x at 0x%08x\n", NAME, SIZE, PADDR);
 100
 101         arctic_mtd_map.virt = ioremap(PADDR, SIZE);
 102
 103         if (!arctic_mtd_map.virt) {
 104                 printk("%s: failed to ioremap 0x%x\n", NAME, PADDR);
 105                 return -EIO;
 106         }
 107         simple_map_init(&arctic_mtd_map);
 108
 109         printk("%s: probing %d-bit flash bus\n", NAME, BUSWIDTH * 8);
 110         arctic_mtd = do_map_probe("cfi_probe", &arctic_mtd_map);
 111
 112         if (!arctic_mtd)
 113                 return -ENXIO;
 114
 115         arctic_mtd->owner = THIS_MODULE;
 116
 117         return add_mtd_partitions(arctic_mtd, arctic_partitions, PARTITIONS);
 118 }
 119
 120 static void __exit
 121 cleanup_arctic_mtd(void)
 122 {
 123         if (arctic_mtd) {
 124                 del_mtd_partitions(arctic_mtd);
 125                 map_destroy(arctic_mtd);
 126                 iounmap((void *) arctic_mtd_map.virt);
 127         }
 128 }
 129
 130 module_init(init_arctic_mtd);
 131 module_exit(cleanup_arctic_mtd);
 132
 133 MODULE_LICENSE("GPL");
 134 MODULE_AUTHOR("David Gibson <arctic@gibson.dropbear.id.au>");
 135 MODULE_DESCRIPTION("MTD map and partitions for IBM 405LP Arctic boards");