[MTD] Factor out OF partition support from the NOR driver.
[linux-2.6] / drivers / mtd / maps / redwood.c
1 /*
2  * $Id: redwood.c,v 1.11 2005/11/07 11:14:28 gleixner Exp $
3  *
4  * drivers/mtd/maps/redwood.c
5  *
6  * FLASH map for the IBM Redwood 4/5/6 boards.
7  *
8  * Author: MontaVista Software, Inc. <source@mvista.com>
9  *
10  * 2001-2003 (c) MontaVista, Software, Inc. This file is licensed under
11  * the terms of the GNU General Public License version 2. This program
12  * is licensed "as is" without any warranty of any kind, whether express
13  * or implied.
14  */
15
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20
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
27 #if !defined (CONFIG_REDWOOD_6)
28
29 #define WINDOW_ADDR 0xffc00000
30 #define WINDOW_SIZE 0x00400000
31
32 #define RW_PART0_OF     0
33 #define RW_PART0_SZ     0x10000
34 #define RW_PART1_OF     RW_PART0_SZ
35 #define RW_PART1_SZ     0x200000 - 0x10000
36 #define RW_PART2_OF     0x200000
37 #define RW_PART2_SZ     0x10000
38 #define RW_PART3_OF     0x210000
39 #define RW_PART3_SZ     0x200000 - (0x10000 + 0x20000)
40 #define RW_PART4_OF     0x3e0000
41 #define RW_PART4_SZ     0x20000
42
43 static struct mtd_partition redwood_flash_partitions[] = {
44         {
45                 .name = "Redwood OpenBIOS Vital Product Data",
46                 .offset = RW_PART0_OF,
47                 .size = RW_PART0_SZ,
48                 .mask_flags = MTD_WRITEABLE     /* force read-only */
49         },
50         {
51                 .name = "Redwood kernel",
52                 .offset = RW_PART1_OF,
53                 .size = RW_PART1_SZ
54         },
55         {
56                 .name = "Redwood OpenBIOS non-volatile storage",
57                 .offset = RW_PART2_OF,
58                 .size = RW_PART2_SZ,
59                 .mask_flags = MTD_WRITEABLE     /* force read-only */
60         },
61         {
62                 .name = "Redwood filesystem",
63                 .offset = RW_PART3_OF,
64                 .size = RW_PART3_SZ
65         },
66         {
67                 .name = "Redwood OpenBIOS",
68                 .offset = RW_PART4_OF,
69                 .size = RW_PART4_SZ,
70                 .mask_flags = MTD_WRITEABLE     /* force read-only */
71         }
72 };
73
74 #else /* CONFIG_REDWOOD_6 */
75 /* FIXME: the window is bigger - armin */
76 #define WINDOW_ADDR 0xff800000
77 #define WINDOW_SIZE 0x00800000
78
79 #define RW_PART0_OF     0
80 #define RW_PART0_SZ     0x400000        /* 4 MiB data */
81 #define RW_PART1_OF     RW_PART0_OF + RW_PART0_SZ
82 #define RW_PART1_SZ     0x10000         /* 64K VPD */
83 #define RW_PART2_OF     RW_PART1_OF + RW_PART1_SZ
84 #define RW_PART2_SZ     0x400000 - (0x10000 + 0x20000)
85 #define RW_PART3_OF     RW_PART2_OF + RW_PART2_SZ
86 #define RW_PART3_SZ     0x20000
87
88 static struct mtd_partition redwood_flash_partitions[] = {
89         {
90                 .name = "Redwood filesystem",
91                 .offset = RW_PART0_OF,
92                 .size = RW_PART0_SZ
93         },
94         {
95                 .name = "Redwood OpenBIOS Vital Product Data",
96                 .offset = RW_PART1_OF,
97                 .size = RW_PART1_SZ,
98                 .mask_flags = MTD_WRITEABLE     /* force read-only */
99         },
100         {
101                 .name = "Redwood kernel",
102                 .offset = RW_PART2_OF,
103                 .size = RW_PART2_SZ
104         },
105         {
106                 .name = "Redwood OpenBIOS",
107                 .offset = RW_PART3_OF,
108                 .size = RW_PART3_SZ,
109                 .mask_flags = MTD_WRITEABLE     /* force read-only */
110         }
111 };
112
113 #endif /* CONFIG_REDWOOD_6 */
114
115 struct map_info redwood_flash_map = {
116         .name = "IBM Redwood",
117         .size = WINDOW_SIZE,
118         .bankwidth = 2,
119         .phys = WINDOW_ADDR,
120 };
121
122
123 #define NUM_REDWOOD_FLASH_PARTITIONS ARRAY_SIZE(redwood_flash_partitions)
124
125 static struct mtd_info *redwood_mtd;
126
127 int __init init_redwood_flash(void)
128 {
129         int err;
130
131         printk(KERN_NOTICE "redwood: flash mapping: %x at %x\n",
132                         WINDOW_SIZE, WINDOW_ADDR);
133
134         redwood_flash_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
135
136         if (!redwood_flash_map.virt) {
137                 printk("init_redwood_flash: failed to ioremap\n");
138                 return -EIO;
139         }
140         simple_map_init(&redwood_flash_map);
141
142         redwood_mtd = do_map_probe("cfi_probe",&redwood_flash_map);
143
144         if (redwood_mtd) {
145                 redwood_mtd->owner = THIS_MODULE;
146                 err = add_mtd_partitions(redwood_mtd,
147                                 redwood_flash_partitions,
148                                 NUM_REDWOOD_FLASH_PARTITIONS);
149                 if (err) {
150                         printk("init_redwood_flash: add_mtd_partitions failed\n");
151                         iounmap(redwood_flash_map.virt);
152                 }
153                 return err;
154
155         }
156
157         iounmap(redwood_flash_map.virt);
158         return -ENXIO;
159 }
160
161 static void __exit cleanup_redwood_flash(void)
162 {
163         if (redwood_mtd) {
164                 del_mtd_partitions(redwood_mtd);
165                 /* moved iounmap after map_destroy - armin */
166                 map_destroy(redwood_mtd);
167                 iounmap((void *)redwood_flash_map.virt);
168         }
169 }
170
171 module_init(init_redwood_flash);
172 module_exit(cleanup_redwood_flash);
173
174 MODULE_LICENSE("GPL");
175 MODULE_AUTHOR("MontaVista Software <source@mvista.com>");
176 MODULE_DESCRIPTION("MTD map driver for the IBM Redwood reference boards");