Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6.git] / drivers / mtd / maps / lubbock-flash.c
1 /*
2  * $Id: lubbock-flash.c,v 1.21 2005/11/07 11:14:27 gleixner Exp $
3  *
4  * Map driver for the Lubbock developer platform.
5  *
6  * Author:      Nicolas Pitre
7  * Copyright:   (C) 2001 MontaVista Software Inc.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18
19 #include <linux/mtd/mtd.h>
20 #include <linux/mtd/map.h>
21 #include <linux/mtd/partitions.h>
22
23 #include <asm/io.h>
24 #include <asm/hardware.h>
25 #include <asm/arch/pxa-regs.h>
26 #include <asm/arch/lubbock.h>
27 #include <asm/cacheflush.h>
28
29 #define ROM_ADDR        0x00000000
30 #define FLASH_ADDR      0x04000000
31
32 #define WINDOW_SIZE     64*1024*1024
33
34 static void lubbock_map_inval_cache(struct map_info *map, unsigned long from, ssize_t len)
35 {
36         flush_ioremap_region(map->phys, map->cached, from, len);
37 }
38
39 static struct map_info lubbock_maps[2] = { {
40         .size =         WINDOW_SIZE,
41         .phys =         0x00000000,
42         .inval_cache =  lubbock_map_inval_cache,
43 }, {
44         .size =         WINDOW_SIZE,
45         .phys =         0x04000000,
46         .inval_cache =  lubbock_map_inval_cache,
47 } };
48
49 static struct mtd_partition lubbock_partitions[] = {
50         {
51                 .name =         "Bootloader",
52                 .size =         0x00040000,
53                 .offset =       0,
54                 .mask_flags =   MTD_WRITEABLE  /* force read-only */
55         },{
56                 .name =         "Kernel",
57                 .size =         0x00100000,
58                 .offset =       0x00040000,
59         },{
60                 .name =         "Filesystem",
61                 .size =         MTDPART_SIZ_FULL,
62                 .offset =       0x00140000
63         }
64 };
65
66 static struct mtd_info *mymtds[2];
67 static struct mtd_partition *parsed_parts[2];
68 static int nr_parsed_parts[2];
69
70 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
71
72 static int __init init_lubbock(void)
73 {
74         int flashboot = (LUB_CONF_SWITCHES & 1);
75         int ret = 0, i;
76
77         lubbock_maps[0].bankwidth = lubbock_maps[1].bankwidth =
78                 (BOOT_DEF & 1) ? 2 : 4;
79
80         /* Compensate for the nROMBT switch which swaps the flash banks */
81         printk(KERN_NOTICE "Lubbock configured to boot from %s (bank %d)\n",
82                flashboot?"Flash":"ROM", flashboot);
83
84         lubbock_maps[flashboot^1].name = "Lubbock Application Flash";
85         lubbock_maps[flashboot].name = "Lubbock Boot ROM";
86
87         for (i = 0; i < 2; i++) {
88                 lubbock_maps[i].virt = ioremap(lubbock_maps[i].phys, WINDOW_SIZE);
89                 if (!lubbock_maps[i].virt) {
90                         printk(KERN_WARNING "Failed to ioremap %s\n", lubbock_maps[i].name);
91                         if (!ret)
92                                 ret = -ENOMEM;
93                         continue;
94                 }
95                 lubbock_maps[i].cached = ioremap_cached(lubbock_maps[i].phys, WINDOW_SIZE);
96                 if (!lubbock_maps[i].cached)
97                         printk(KERN_WARNING "Failed to ioremap cached %s\n", lubbock_maps[i].name);
98                 simple_map_init(&lubbock_maps[i]);
99
100                 printk(KERN_NOTICE "Probing %s at physical address 0x%08lx (%d-bit bankwidth)\n",
101                        lubbock_maps[i].name, lubbock_maps[i].phys,
102                        lubbock_maps[i].bankwidth * 8);
103
104                 mymtds[i] = do_map_probe("cfi_probe", &lubbock_maps[i]);
105
106                 if (!mymtds[i]) {
107                         iounmap((void *)lubbock_maps[i].virt);
108                         if (lubbock_maps[i].cached)
109                                 iounmap(lubbock_maps[i].cached);
110                         if (!ret)
111                                 ret = -EIO;
112                         continue;
113                 }
114                 mymtds[i]->owner = THIS_MODULE;
115
116                 ret = parse_mtd_partitions(mymtds[i], probes,
117                                            &parsed_parts[i], 0);
118
119                 if (ret > 0)
120                         nr_parsed_parts[i] = ret;
121         }
122
123         if (!mymtds[0] && !mymtds[1])
124                 return ret;
125
126         for (i = 0; i < 2; i++) {
127                 if (!mymtds[i]) {
128                         printk(KERN_WARNING "%s is absent. Skipping\n", lubbock_maps[i].name);
129                 } else if (nr_parsed_parts[i]) {
130                         add_mtd_partitions(mymtds[i], parsed_parts[i], nr_parsed_parts[i]);
131                 } else if (!i) {
132                         printk("Using static partitions on %s\n", lubbock_maps[i].name);
133                         add_mtd_partitions(mymtds[i], lubbock_partitions, ARRAY_SIZE(lubbock_partitions));
134                 } else {
135                         printk("Registering %s as whole device\n", lubbock_maps[i].name);
136                         add_mtd_device(mymtds[i]);
137                 }
138         }
139         return 0;
140 }
141
142 static void __exit cleanup_lubbock(void)
143 {
144         int i;
145         for (i = 0; i < 2; i++) {
146                 if (!mymtds[i])
147                         continue;
148
149                 if (nr_parsed_parts[i] || !i)
150                         del_mtd_partitions(mymtds[i]);
151                 else
152                         del_mtd_device(mymtds[i]);
153
154                 map_destroy(mymtds[i]);
155                 iounmap((void *)lubbock_maps[i].virt);
156                 if (lubbock_maps[i].cached)
157                         iounmap(lubbock_maps[i].cached);
158
159                 kfree(parsed_parts[i]);
160         }
161 }
162
163 module_init(init_lubbock);
164 module_exit(cleanup_lubbock);
165
166 MODULE_LICENSE("GPL");
167 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
168 MODULE_DESCRIPTION("MTD map driver for Intel Lubbock");