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1 | /* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board |
2 | * | |
3 | * Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com) | |
4 | * based on sc520cdp.c by Sysgo Real-Time Solutions GmbH | |
5 | * | |
1da177e4 LT |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA | |
19 | * | |
20 | * The NetSc520 is a demonstration board for the Elan Sc520 processor available | |
21 | * from AMD. It has a single back of 16 megs of 32-bit Flash ROM and another | |
22 | * 16 megs of SDRAM. | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/init.h> | |
29 | #include <asm/io.h> | |
30 | #include <linux/mtd/mtd.h> | |
31 | #include <linux/mtd/map.h> | |
32 | #include <linux/mtd/partitions.h> | |
33 | ||
34 | ||
35 | /* | |
36 | ** The single, 16 megabyte flash bank is divided into four virtual | |
37 | ** partitions. The first partition is 768 KiB and is intended to | |
38 | ** store the kernel image loaded by the bootstrap loader. The second | |
69f34c98 | 39 | ** partition is 256 KiB and holds the BIOS image. The third |
1da177e4 LT |
40 | ** partition is 14.5 MiB and is intended for the flash file system |
41 | ** image. The last partition is 512 KiB and contains another copy | |
42 | ** of the BIOS image and the reset vector. | |
43 | ** | |
44 | ** Only the third partition should be mounted. The first partition | |
45 | ** should not be mounted, but it can erased and written to using the | |
46 | ** MTD character routines. The second and fourth partitions should | |
47 | ** not be touched - it is possible to corrupt the BIOS image by | |
48 | ** mounting these partitions, and potentially the board will not be | |
49 | ** recoverable afterwards. | |
50 | */ | |
51 | ||
69f34c98 | 52 | /* partition_info gives details on the logical partitions that the split the |
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53 | * single flash device into. If the size if zero we use up to the end of the |
54 | * device. */ | |
55 | static struct mtd_partition partition_info[]={ | |
69f34c98 TG |
56 | { |
57 | .name = "NetSc520 boot kernel", | |
58 | .offset = 0, | |
1da177e4 LT |
59 | .size = 0xc0000 |
60 | }, | |
69f34c98 TG |
61 | { |
62 | .name = "NetSc520 Low BIOS", | |
63 | .offset = 0xc0000, | |
1da177e4 LT |
64 | .size = 0x40000 |
65 | }, | |
69f34c98 TG |
66 | { |
67 | .name = "NetSc520 file system", | |
68 | .offset = 0x100000, | |
1da177e4 LT |
69 | .size = 0xe80000 |
70 | }, | |
69f34c98 TG |
71 | { |
72 | .name = "NetSc520 High BIOS", | |
73 | .offset = 0xf80000, | |
1da177e4 LT |
74 | .size = 0x80000 |
75 | }, | |
76 | }; | |
87d10f3c | 77 | #define NUM_PARTITIONS ARRAY_SIZE(partition_info) |
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78 | |
79 | #define WINDOW_SIZE 0x00100000 | |
80 | #define WINDOW_ADDR 0x00200000 | |
81 | ||
82 | static struct map_info netsc520_map = { | |
83 | .name = "netsc520 Flash Bank", | |
84 | .size = WINDOW_SIZE, | |
85 | .bankwidth = 4, | |
86 | .phys = WINDOW_ADDR, | |
87 | }; | |
88 | ||
87d10f3c | 89 | #define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map) |
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90 | |
91 | static struct mtd_info *mymtd; | |
92 | ||
93 | static int __init init_netsc520(void) | |
94 | { | |
3ce32f5d AM |
95 | printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n", |
96 | (unsigned long long)netsc520_map.size, | |
97 | (unsigned long long)netsc520_map.phys); | |
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98 | netsc520_map.virt = ioremap_nocache(netsc520_map.phys, netsc520_map.size); |
99 | ||
100 | if (!netsc520_map.virt) { | |
101 | printk("Failed to ioremap_nocache\n"); | |
102 | return -EIO; | |
103 | } | |
104 | ||
105 | simple_map_init(&netsc520_map); | |
106 | ||
107 | mymtd = do_map_probe("cfi_probe", &netsc520_map); | |
108 | if(!mymtd) | |
109 | mymtd = do_map_probe("map_ram", &netsc520_map); | |
110 | if(!mymtd) | |
111 | mymtd = do_map_probe("map_rom", &netsc520_map); | |
112 | ||
113 | if (!mymtd) { | |
114 | iounmap(netsc520_map.virt); | |
115 | return -ENXIO; | |
116 | } | |
69f34c98 | 117 | |
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118 | mymtd->owner = THIS_MODULE; |
119 | add_mtd_partitions( mymtd, partition_info, NUM_PARTITIONS ); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static void __exit cleanup_netsc520(void) | |
124 | { | |
125 | if (mymtd) { | |
126 | del_mtd_partitions(mymtd); | |
127 | map_destroy(mymtd); | |
128 | } | |
129 | if (netsc520_map.virt) { | |
130 | iounmap(netsc520_map.virt); | |
131 | netsc520_map.virt = NULL; | |
132 | } | |
133 | } | |
134 | ||
135 | module_init(init_netsc520); | |
136 | module_exit(cleanup_netsc520); | |
137 | ||
138 | MODULE_LICENSE("GPL"); | |
139 | MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>"); | |
140 | MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board"); |