Pull bugzilla-3774 into release branch
[linux-2.6] / drivers / mtd / maps / impa7.c
1 /*
2  * $Id: impa7.c,v 1.14 2005/11/07 11:14:27 gleixner Exp $
3  *
4  * Handle mapping of the NOR flash on implementa A7 boards
5  *
6  * Copyright 2002 SYSGO Real-Time Solutions GmbH
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
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
21 #ifdef CONFIG_MTD_PARTITIONS
22 #include <linux/mtd/partitions.h>
23 #endif
24
25 #define WINDOW_ADDR0 0x00000000      /* physical properties of flash */
26 #define WINDOW_SIZE0 0x00800000
27 #define WINDOW_ADDR1 0x10000000      /* physical properties of flash */
28 #define WINDOW_SIZE1 0x00800000
29 #define NUM_FLASHBANKS 2
30 #define BUSWIDTH     4
31
32 /* can be { "cfi_probe", "jedec_probe", "map_rom", NULL } */
33 #define PROBETYPES { "jedec_probe", NULL }
34
35 #define MSG_PREFIX "impA7:"   /* prefix for our printk()'s */
36 #define MTDID      "impa7-%d"  /* for mtdparts= partitioning */
37
38 static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
39
40
41 static struct map_info impa7_map[NUM_FLASHBANKS] = {
42         {
43                 .name = "impA7 NOR Flash Bank #0",
44                 .size = WINDOW_SIZE0,
45                 .bankwidth = BUSWIDTH,
46         },
47         {
48                 .name = "impA7 NOR Flash Bank #1",
49                 .size = WINDOW_SIZE1,
50                 .bankwidth = BUSWIDTH,
51         },
52 };
53
54 #ifdef CONFIG_MTD_PARTITIONS
55
56 /*
57  * MTD partitioning stuff
58  */
59 static struct mtd_partition static_partitions[] =
60 {
61         {
62                 .name = "FileSystem",
63                 .size = 0x800000,
64                 .offset = 0x00000000
65         },
66 };
67
68 static int mtd_parts_nb[NUM_FLASHBANKS];
69 static struct mtd_partition *mtd_parts[NUM_FLASHBANKS];
70
71 #endif
72
73 static const char *probes[] = { "cmdlinepart", NULL };
74
75 int __init init_impa7(void)
76 {
77         static const char *rom_probe_types[] = PROBETYPES;
78         const char **type;
79         const char *part_type = 0;
80         int i;
81         static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
82           { WINDOW_ADDR0, WINDOW_SIZE0 },
83           { WINDOW_ADDR1, WINDOW_SIZE1 },
84         };
85         int devicesfound = 0;
86
87         for(i=0; i<NUM_FLASHBANKS; i++)
88         {
89                 printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
90                        pt[i].size, pt[i].addr);
91
92                 impa7_map[i].phys = pt[i].addr;
93                 impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
94                 if (!impa7_map[i].virt) {
95                         printk(MSG_PREFIX "failed to ioremap\n");
96                         return -EIO;
97                 }
98                 simple_map_init(&impa7_map[i]);
99
100                 impa7_mtd[i] = 0;
101                 type = rom_probe_types;
102                 for(; !impa7_mtd[i] && *type; type++) {
103                         impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
104                 }
105
106                 if (impa7_mtd[i]) {
107                         impa7_mtd[i]->owner = THIS_MODULE;
108                         devicesfound++;
109 #ifdef CONFIG_MTD_PARTITIONS
110                         mtd_parts_nb[i] = parse_mtd_partitions(impa7_mtd[i],
111                                                                probes,
112                                                                &mtd_parts[i],
113                                                                0);
114                         if (mtd_parts_nb[i] > 0) {
115                                 part_type = "command line";
116                         } else {
117                                 mtd_parts[i] = static_partitions;
118                                 mtd_parts_nb[i] = ARRAY_SIZE(static_partitions);
119                                 part_type = "static";
120                         }
121
122                         printk(KERN_NOTICE MSG_PREFIX
123                                "using %s partition definition\n",
124                                part_type);
125                         add_mtd_partitions(impa7_mtd[i],
126                                            mtd_parts[i], mtd_parts_nb[i]);
127 #else
128                         add_mtd_device(impa7_mtd[i]);
129
130 #endif
131                 }
132                 else
133                         iounmap((void *)impa7_map[i].virt);
134         }
135         return devicesfound == 0 ? -ENXIO : 0;
136 }
137
138 static void __exit cleanup_impa7(void)
139 {
140         int i;
141         for (i=0; i<NUM_FLASHBANKS; i++) {
142                 if (impa7_mtd[i]) {
143 #ifdef CONFIG_MTD_PARTITIONS
144                         del_mtd_partitions(impa7_mtd[i]);
145 #else
146                         del_mtd_device(impa7_mtd[i]);
147 #endif
148                         map_destroy(impa7_mtd[i]);
149                         iounmap((void *)impa7_map[i].virt);
150                         impa7_map[i].virt = 0;
151                 }
152         }
153 }
154
155 module_init(init_impa7);
156 module_exit(cleanup_impa7);
157
158 MODULE_LICENSE("GPL");
159 MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
160 MODULE_DESCRIPTION("MTD map driver for implementa impA7");