1 /*
2 * Handle mapping of the NOR flash on Cogent EDB7312 boards
3 *
4 * Copyright 2002 SYSGO Real-Time Solutions GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <asm/io.h>
16 #include <linux/mtd/mtd.h>
17 #include <linux/mtd/map.h>
18
19 #ifdef CONFIG_MTD_PARTITIONS
20 #include <linux/mtd/partitions.h>
21 #endif
22
23 #define WINDOW_ADDR 0x00000000 /* physical properties of flash */
24 #define WINDOW_SIZE 0x01000000
25 #define BUSWIDTH 2
26 #define FLASH_BLOCKSIZE_MAIN 0x20000
27 #define FLASH_NUMBLOCKS_MAIN 128
28 /* can be "cfi_probe", "jedec_probe", "map_rom", NULL }; */
29 #define PROBETYPES { "cfi_probe", NULL }
30
31 #define MSG_PREFIX "EDB7312-NOR:" /* prefix for our printk()'s */
32 #define MTDID "edb7312-nor" /* for mtdparts= partitioning */
33
34 static struct mtd_info *mymtd;
35
36 struct map_info edb7312nor_map = {
37 .name = "NOR flash on EDB7312",
38 .size = WINDOW_SIZE,
39 .bankwidth = BUSWIDTH,
40 .phys = WINDOW_ADDR,
41 };
42
43 #ifdef CONFIG_MTD_PARTITIONS
44
45 /*
46 * MTD partitioning stuff
47 */
48 static struct mtd_partition static_partitions[3] =
49 {
50 {
51 .name = "ARMboot",
52 .size = 0x40000,
53 .offset = 0
54 },
55 {
56 .name = "Kernel",
57 .size = 0x200000,
58 .offset = 0x40000
59 },
60 {
61 .name = "RootFS",
62 .size = 0xDC0000,
63 .offset = 0x240000
64 },
65 };
66
67 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
68
69 #endif
70
71 static int mtd_parts_nb = 0;
72 static struct mtd_partition *mtd_parts = 0;
73
init_edb7312nor(void)74 static int __init init_edb7312nor(void)
75 {
76 static const char *rom_probe_types[] = PROBETYPES;
77 const char **type;
78 const char *part_type = 0;
79
80 printk(KERN_NOTICE MSG_PREFIX "0x%08x at 0x%08x\n",
81 WINDOW_SIZE, WINDOW_ADDR);
82 edb7312nor_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
83
84 if (!edb7312nor_map.virt) {
85 printk(MSG_PREFIX "failed to ioremap\n");
86 return -EIO;
87 }
88
89 simple_map_init(&edb7312nor_map);
90
91 mymtd = 0;
92 type = rom_probe_types;
93 for(; !mymtd && *type; type++) {
94 mymtd = do_map_probe(*type, &edb7312nor_map);
95 }
96 if (mymtd) {
97 mymtd->owner = THIS_MODULE;
98
99 #ifdef CONFIG_MTD_PARTITIONS
100 mtd_parts_nb = parse_mtd_partitions(mymtd, probes, &mtd_parts, MTDID);
101 if (mtd_parts_nb > 0)
102 part_type = "detected";
103
104 if (mtd_parts_nb == 0)
105 {
106 mtd_parts = static_partitions;
107 mtd_parts_nb = ARRAY_SIZE(static_partitions);
108 part_type = "static";
109 }
110 #endif
111 add_mtd_device(mymtd);
112 if (mtd_parts_nb == 0)
113 printk(KERN_NOTICE MSG_PREFIX "no partition info available\n");
114 else
115 {
116 printk(KERN_NOTICE MSG_PREFIX
117 "using %s partition definition\n", part_type);
118 add_mtd_partitions(mymtd, mtd_parts, mtd_parts_nb);
119 }
120 return 0;
121 }
122
123 iounmap((void *)edb7312nor_map.virt);
124 return -ENXIO;
125 }
126
cleanup_edb7312nor(void)127 static void __exit cleanup_edb7312nor(void)
128 {
129 if (mymtd) {
130 del_mtd_device(mymtd);
131 map_destroy(mymtd);
132 }
133 if (edb7312nor_map.virt) {
134 iounmap((void *)edb7312nor_map.virt);
135 edb7312nor_map.virt = 0;
136 }
137 }
138
139 module_init(init_edb7312nor);
140 module_exit(cleanup_edb7312nor);
141
142 MODULE_LICENSE("GPL");
143 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
144 MODULE_DESCRIPTION("Generic configurable MTD map driver");
145