drivers/mtd/maps/mbx860.c

   1 /*
   2  * $Id: mbx860.c,v 1.6 2004/07/12 21:59:44 dwmw2 Exp $
   3  *
   4  * Handle mapping of the flash on MBX860 boards
   5  *
   6  * Author:      Anton Todorov
   7  * Copyright:   (C) 2001 Emness Technology
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <asm/io.h>
  20 #include <linux/mtd/mtd.h>
  21 #include <linux/mtd/map.h>
  22 #include <linux/mtd/partitions.h>
  23
  24
  25 #define WINDOW_ADDR 0xfe000000
  26 #define WINDOW_SIZE 0x00200000
  27
  28 /* Flash / Partition sizing */
  29 #define MAX_SIZE_KiB              8192
  30 #define BOOT_PARTITION_SIZE_KiB    512
  31 #define KERNEL_PARTITION_SIZE_KiB 5632
  32 #define APP_PARTITION_SIZE_KiB    2048
  33
  34 #define NUM_PARTITIONS 3
  35
  36 /* partition_info gives details on the logical partitions that the split the
  37  * single flash device into. If the size if zero we use up to the end of the
  38  * device. */
  39 static struct mtd_partition partition_info[]={
  40         { .name = "MBX flash BOOT partition",
  41         .offset = 0,
  42         .size =   BOOT_PARTITION_SIZE_KiB*1024 },
  43         { .name = "MBX flash DATA partition",
  44         .offset = BOOT_PARTITION_SIZE_KiB*1024,
  45         .size = (KERNEL_PARTITION_SIZE_KiB)*1024 },
  46         { .name = "MBX flash APPLICATION partition",
  47         .offset = (BOOT_PARTITION_SIZE_KiB+KERNEL_PARTITION_SIZE_KiB)*1024 }
  48 };
  49
  50
  51 static struct mtd_info *mymtd;
  52
  53 struct map_info mbx_map = {
  54         .name = "MBX flash",
  55         .size = WINDOW_SIZE,
  56         .phys = WINDOW_ADDR,
  57         .bankwidth = 4,
  58 };
  59
  60 int __init init_mbx(void)
  61 {
  62         printk(KERN_NOTICE "Motorola MBX flash device: 0x%x at 0x%x\n", WINDOW_SIZE*4, WINDOW_ADDR);
  63         mbx_map.virt = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE * 4);
  64
  65         if (!mbx_map.virt) {
  66                 printk("Failed to ioremap\n");
  67                 return -EIO;
  68         }
  69         simple_map_init(&mbx_map);
  70
  71         mymtd = do_map_probe("jedec_probe", &mbx_map);
  72         if (mymtd) {
  73                 mymtd->owner = THIS_MODULE;
  74                 add_mtd_device(mymtd);
  75                 add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
  76                 return 0;
  77         }
  78
  79         iounmap((void *)mbx_map.virt);
  80         return -ENXIO;
  81 }
  82
  83 static void __exit cleanup_mbx(void)
  84 {
  85         if (mymtd) {
  86                 del_mtd_device(mymtd);
  87                 map_destroy(mymtd);
  88         }
  89         if (mbx_map.virt) {
  90                 iounmap((void *)mbx_map.virt);
  91                 mbx_map.virt = 0;
  92         }
  93 }
  94
  95 module_init(init_mbx);
  96 module_exit(cleanup_mbx);
  97
  98 MODULE_AUTHOR("Anton Todorov <a.todorov@emness.com>");
  99 MODULE_DESCRIPTION("MTD map driver for Motorola MBX860 board");
 100 MODULE_LICENSE("GPL");