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
init_mbx(void)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 mtd_device_register(mymtd, NULL, 0);
73 mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
74 return 0;
75 }
76
77 iounmap((void *)mbx_map.virt);
78 return -ENXIO;
79 }
80
cleanup_mbx(void)81 static void __exit cleanup_mbx(void)
82 {
83 if (mymtd) {
84 mtd_device_unregister(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");
99