release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/mtd/maps/mbx860.c

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