Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Handle mapping of the flash memory access routines on the SBC8240 board. | |
3 | * | |
4 | * Carolyn Smith, Tektronix, Inc. | |
5 | * | |
6 | * This code is GPLed | |
1da177e4 LT |
7 | */ |
8 | ||
9 | /* | |
10 | * The SBC8240 has 2 flash banks. | |
11 | * Bank 0 is a 512 KiB AMD AM29F040B; 8 x 64 KiB sectors. | |
12 | * It contains the U-Boot code (7 sectors) and the environment (1 sector). | |
13 | * Bank 1 is 4 x 1 MiB AMD AM29LV800BT; 15 x 64 KiB sectors, 1 x 32 KiB sector, | |
14 | * 2 x 8 KiB sectors, 1 x 16 KiB sectors. | |
15 | * Both parts are JEDEC compatible. | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <asm/io.h> | |
22 | ||
23 | #include <linux/mtd/mtd.h> | |
24 | #include <linux/mtd/map.h> | |
25 | #include <linux/mtd/cfi.h> | |
26 | ||
27 | #ifdef CONFIG_MTD_PARTITIONS | |
28 | #include <linux/mtd/partitions.h> | |
29 | #endif | |
30 | ||
31 | #define DEBUG | |
32 | ||
33 | #ifdef DEBUG | |
34 | # define debugk(fmt,args...) printk(fmt ,##args) | |
35 | #else | |
36 | # define debugk(fmt,args...) | |
37 | #endif | |
38 | ||
39 | ||
40 | #define WINDOW_ADDR0 0xFFF00000 /* 512 KiB */ | |
41 | #define WINDOW_SIZE0 0x00080000 | |
42 | #define BUSWIDTH0 1 | |
43 | ||
44 | #define WINDOW_ADDR1 0xFF000000 /* 4 MiB */ | |
45 | #define WINDOW_SIZE1 0x00400000 | |
46 | #define BUSWIDTH1 8 | |
47 | ||
48 | #define MSG_PREFIX "sbc8240:" /* prefix for our printk()'s */ | |
49 | #define MTDID "sbc8240-%d" /* for mtdparts= partitioning */ | |
50 | ||
51 | ||
52 | static struct map_info sbc8240_map[2] = { | |
53 | { | |
54 | .name = "sbc8240 Flash Bank #0", | |
55 | .size = WINDOW_SIZE0, | |
56 | .bankwidth = BUSWIDTH0, | |
57 | }, | |
58 | { | |
59 | .name = "sbc8240 Flash Bank #1", | |
60 | .size = WINDOW_SIZE1, | |
61 | .bankwidth = BUSWIDTH1, | |
62 | } | |
63 | }; | |
64 | ||
87d10f3c | 65 | #define NUM_FLASH_BANKS ARRAY_SIZE(sbc8240_map) |
1da177e4 LT |
66 | |
67 | /* | |
68 | * The following defines the partition layout of SBC8240 boards. | |
69 | * | |
70 | * See include/linux/mtd/partitions.h for definition of the | |
71 | * mtd_partition structure. | |
72 | * | |
73 | * The *_max_flash_size is the maximum possible mapped flash size | |
74 | * which is not necessarily the actual flash size. It must correspond | |
75 | * to the value specified in the mapping definition defined by the | |
76 | * "struct map_desc *_io_desc" for the corresponding machine. | |
77 | */ | |
78 | ||
79 | #ifdef CONFIG_MTD_PARTITIONS | |
80 | ||
81 | static struct mtd_partition sbc8240_uboot_partitions [] = { | |
82 | /* Bank 0 */ | |
83 | { | |
84 | .name = "U-boot", /* U-Boot Firmware */ | |
85 | .offset = 0, | |
86 | .size = 0x00070000, /* 7 x 64 KiB sectors */ | |
87 | .mask_flags = MTD_WRITEABLE, /* force read-only */ | |
88 | }, | |
89 | { | |
90 | .name = "environment", /* U-Boot environment */ | |
91 | .offset = 0x00070000, | |
92 | .size = 0x00010000, /* 1 x 64 KiB sector */ | |
93 | }, | |
94 | }; | |
95 | ||
96 | static struct mtd_partition sbc8240_fs_partitions [] = { | |
97 | { | |
98 | .name = "jffs", /* JFFS filesystem */ | |
99 | .offset = 0, | |
100 | .size = 0x003C0000, /* 4 * 15 * 64KiB */ | |
101 | }, | |
102 | { | |
103 | .name = "tmp32", | |
104 | .offset = 0x003C0000, | |
105 | .size = 0x00020000, /* 4 * 32KiB */ | |
106 | }, | |
107 | { | |
108 | .name = "tmp8a", | |
109 | .offset = 0x003E0000, | |
110 | .size = 0x00008000, /* 4 * 8KiB */ | |
111 | }, | |
112 | { | |
113 | .name = "tmp8b", | |
114 | .offset = 0x003E8000, | |
115 | .size = 0x00008000, /* 4 * 8KiB */ | |
116 | }, | |
117 | { | |
118 | .name = "tmp16", | |
119 | .offset = 0x003F0000, | |
120 | .size = 0x00010000, /* 4 * 16KiB */ | |
121 | } | |
122 | }; | |
123 | ||
1da177e4 LT |
124 | /* trivial struct to describe partition information */ |
125 | struct mtd_part_def | |
126 | { | |
127 | int nums; | |
128 | unsigned char *type; | |
129 | struct mtd_partition* mtd_part; | |
130 | }; | |
131 | ||
132 | static struct mtd_info *sbc8240_mtd[NUM_FLASH_BANKS]; | |
133 | static struct mtd_part_def sbc8240_part_banks[NUM_FLASH_BANKS]; | |
134 | ||
135 | ||
136 | #endif /* CONFIG_MTD_PARTITIONS */ | |
137 | ||
138 | ||
9ee49fa5 | 139 | static int __init init_sbc8240_mtd (void) |
1da177e4 LT |
140 | { |
141 | static struct _cjs { | |
142 | u_long addr; | |
143 | u_long size; | |
144 | } pt[NUM_FLASH_BANKS] = { | |
145 | { | |
146 | .addr = WINDOW_ADDR0, | |
147 | .size = WINDOW_SIZE0 | |
148 | }, | |
149 | { | |
150 | .addr = WINDOW_ADDR1, | |
151 | .size = WINDOW_SIZE1 | |
152 | }, | |
153 | }; | |
154 | ||
155 | int devicesfound = 0; | |
25f0c659 | 156 | int i,j; |
1da177e4 LT |
157 | |
158 | for (i = 0; i < NUM_FLASH_BANKS; i++) { | |
159 | printk (KERN_NOTICE MSG_PREFIX | |
160 | "Probing 0x%08lx at 0x%08lx\n", pt[i].size, pt[i].addr); | |
161 | ||
162 | sbc8240_map[i].map_priv_1 = | |
163 | (unsigned long) ioremap (pt[i].addr, pt[i].size); | |
164 | if (!sbc8240_map[i].map_priv_1) { | |
165 | printk (MSG_PREFIX "failed to ioremap\n"); | |
25f0c659 AL |
166 | for (j = 0; j < i; j++) { |
167 | iounmap((void *) sbc8240_map[j].map_priv_1); | |
168 | sbc8240_map[j].map_priv_1 = 0; | |
169 | } | |
1da177e4 LT |
170 | return -EIO; |
171 | } | |
172 | simple_map_init(&sbc8240_mtd[i]); | |
173 | ||
174 | sbc8240_mtd[i] = do_map_probe("jedec_probe", &sbc8240_map[i]); | |
175 | ||
176 | if (sbc8240_mtd[i]) { | |
177 | sbc8240_mtd[i]->module = THIS_MODULE; | |
178 | devicesfound++; | |
25f0c659 AL |
179 | } else { |
180 | if (sbc8240_map[i].map_priv_1) { | |
181 | iounmap((void *) sbc8240_map[i].map_priv_1); | |
182 | sbc8240_map[i].map_priv_1 = 0; | |
183 | } | |
1da177e4 LT |
184 | } |
185 | } | |
186 | ||
187 | if (!devicesfound) { | |
188 | printk(KERN_NOTICE MSG_PREFIX | |
189 | "No suppported flash chips found!\n"); | |
190 | return -ENXIO; | |
191 | } | |
192 | ||
193 | #ifdef CONFIG_MTD_PARTITIONS | |
194 | sbc8240_part_banks[0].mtd_part = sbc8240_uboot_partitions; | |
195 | sbc8240_part_banks[0].type = "static image"; | |
87d10f3c | 196 | sbc8240_part_banks[0].nums = ARRAY_SIZE(sbc8240_uboot_partitions); |
1da177e4 LT |
197 | sbc8240_part_banks[1].mtd_part = sbc8240_fs_partitions; |
198 | sbc8240_part_banks[1].type = "static file system"; | |
87d10f3c | 199 | sbc8240_part_banks[1].nums = ARRAY_SIZE(sbc8240_fs_partitions); |
1da177e4 LT |
200 | |
201 | for (i = 0; i < NUM_FLASH_BANKS; i++) { | |
202 | ||
203 | if (!sbc8240_mtd[i]) continue; | |
204 | if (sbc8240_part_banks[i].nums == 0) { | |
205 | printk (KERN_NOTICE MSG_PREFIX | |
206 | "No partition info available, registering whole device\n"); | |
207 | add_mtd_device(sbc8240_mtd[i]); | |
208 | } else { | |
209 | printk (KERN_NOTICE MSG_PREFIX | |
210 | "Using %s partition definition\n", sbc8240_part_banks[i].mtd_part->name); | |
69f34c98 | 211 | add_mtd_partitions (sbc8240_mtd[i], |
1da177e4 LT |
212 | sbc8240_part_banks[i].mtd_part, |
213 | sbc8240_part_banks[i].nums); | |
214 | } | |
215 | } | |
216 | #else | |
217 | printk(KERN_NOTICE MSG_PREFIX | |
218 | "Registering %d flash banks at once\n", devicesfound); | |
219 | ||
220 | for (i = 0; i < devicesfound; i++) { | |
221 | add_mtd_device(sbc8240_mtd[i]); | |
222 | } | |
223 | #endif /* CONFIG_MTD_PARTITIONS */ | |
224 | ||
225 | return devicesfound == 0 ? -ENXIO : 0; | |
226 | } | |
227 | ||
228 | static void __exit cleanup_sbc8240_mtd (void) | |
229 | { | |
230 | int i; | |
231 | ||
232 | for (i = 0; i < NUM_FLASH_BANKS; i++) { | |
233 | if (sbc8240_mtd[i]) { | |
234 | del_mtd_device (sbc8240_mtd[i]); | |
235 | map_destroy (sbc8240_mtd[i]); | |
236 | } | |
237 | if (sbc8240_map[i].map_priv_1) { | |
238 | iounmap ((void *) sbc8240_map[i].map_priv_1); | |
239 | sbc8240_map[i].map_priv_1 = 0; | |
240 | } | |
241 | } | |
242 | } | |
243 | ||
244 | module_init (init_sbc8240_mtd); | |
245 | module_exit (cleanup_sbc8240_mtd); | |
246 | ||
247 | MODULE_LICENSE ("GPL"); | |
248 | MODULE_AUTHOR ("Carolyn Smith <carolyn.smith@tektronix.com>"); | |
249 | MODULE_DESCRIPTION ("MTD map driver for SBC8240 boards"); | |
250 |