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