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
7 *
8 * $Id: sbc8240.c,v 1.5 2005/11/07 11:14:28 gleixner Exp $
9 *
10 */
11
12 /*
13 * The SBC8240 has 2 flash banks.
14 * Bank 0 is a 512 KiB AMD AM29F040B; 8 x 64 KiB sectors.
15 * It contains the U-Boot code (7 sectors) and the environment (1 sector).
16 * Bank 1 is 4 x 1 MiB AMD AM29LV800BT; 15 x 64 KiB sectors, 1 x 32 KiB sector,
17 * 2 x 8 KiB sectors, 1 x 16 KiB sectors.
18 * Both parts are JEDEC compatible.
19 */
20
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/kernel.h>
24 #include <asm/io.h>
25
26 #include <linux/mtd/mtd.h>
27 #include <linux/mtd/map.h>
28 #include <linux/mtd/cfi.h>
29
30 #ifdef CONFIG_MTD_PARTITIONS
31 #include <linux/mtd/partitions.h>
32 #endif
33
34 #define DEBUG
35
36 #ifdef DEBUG
37 # define debugk(fmt,args...) printk(fmt ,##args)
38 #else
39 # define debugk(fmt,args...)
40 #endif
41
42
43 #define WINDOW_ADDR0 0xFFF00000 /* 512 KiB */
44 #define WINDOW_SIZE0 0x00080000
45 #define BUSWIDTH0 1
46
47 #define WINDOW_ADDR1 0xFF000000 /* 4 MiB */
48 #define WINDOW_SIZE1 0x00400000
49 #define BUSWIDTH1 8
50
51 #define MSG_PREFIX "sbc8240:" /* prefix for our printk()'s */
52 #define MTDID "sbc8240-%d" /* for mtdparts= partitioning */
53
54
55 static struct map_info sbc8240_map[2] = {
56 {
57 .name = "sbc8240 Flash Bank #0",
58 .size = WINDOW_SIZE0,
59 .bankwidth = BUSWIDTH0,
60 },
61 {
62 .name = "sbc8240 Flash Bank #1",
63 .size = WINDOW_SIZE1,
64 .bankwidth = BUSWIDTH1,
65 }
66 };
67
68 #define NUM_FLASH_BANKS ARRAY_SIZE(sbc8240_map)
69
70 /*
71 * The following defines the partition layout of SBC8240 boards.
72 *
73 * See include/linux/mtd/partitions.h for definition of the
74 * mtd_partition structure.
75 *
76 * The *_max_flash_size is the maximum possible mapped flash size
77 * which is not necessarily the actual flash size. It must correspond
78 * to the value specified in the mapping definition defined by the
79 * "struct map_desc *_io_desc" for the corresponding machine.
80 */
81
82 #ifdef CONFIG_MTD_PARTITIONS
83
84 static struct mtd_partition sbc8240_uboot_partitions [] = {
85 /* Bank 0 */
86 {
87 .name = "U-boot", /* U-Boot Firmware */
88 .offset = 0,
89 .size = 0x00070000, /* 7 x 64 KiB sectors */
90 .mask_flags = MTD_WRITEABLE, /* force read-only */
91 },
92 {
93 .name = "environment", /* U-Boot environment */
94 .offset = 0x00070000,
95 .size = 0x00010000, /* 1 x 64 KiB sector */
96 },
97 };
98
99 static struct mtd_partition sbc8240_fs_partitions [] = {
100 {
101 .name = "jffs", /* JFFS filesystem */
102 .offset = 0,
103 .size = 0x003C0000, /* 4 * 15 * 64KiB */
104 },
105 {
106 .name = "tmp32",
107 .offset = 0x003C0000,
108 .size = 0x00020000, /* 4 * 32KiB */
109 },
110 {
111 .name = "tmp8a",
112 .offset = 0x003E0000,
113 .size = 0x00008000, /* 4 * 8KiB */
114 },
115 {
116 .name = "tmp8b",
117 .offset = 0x003E8000,
118 .size = 0x00008000, /* 4 * 8KiB */
119 },
120 {
121 .name = "tmp16",
122 .offset = 0x003F0000,
123 .size = 0x00010000, /* 4 * 16KiB */
124 }
125 };
126
127 /* trivial struct to describe partition information */
128 struct mtd_part_def
129 {
130 int nums;
131 unsigned char *type;
132 struct mtd_partition* mtd_part;
133 };
134
135 static struct mtd_info *sbc8240_mtd[NUM_FLASH_BANKS];
136 static struct mtd_part_def sbc8240_part_banks[NUM_FLASH_BANKS];
137
138
139 #endif /* CONFIG_MTD_PARTITIONS */
140
141
142 int __init init_sbc8240_mtd (void)
143 {
144 static struct _cjs {
145 u_long addr;
146 u_long size;
147 } pt[NUM_FLASH_BANKS] = {
148 {
149 .addr = WINDOW_ADDR0,
150 .size = WINDOW_SIZE0
151 },
152 {
153 .addr = WINDOW_ADDR1,
154 .size = WINDOW_SIZE1
155 },
156 };
157
158 int devicesfound = 0;
159 int i,j;
160
161 for (i = 0; i < NUM_FLASH_BANKS; i++) {
162 printk (KERN_NOTICE MSG_PREFIX
163 "Probing 0x%08lx at 0x%08lx\n", pt[i].size, pt[i].addr);
164
165 sbc8240_map[i].map_priv_1 =
166 (unsigned long) ioremap (pt[i].addr, pt[i].size);
167 if (!sbc8240_map[i].map_priv_1) {
168 printk (MSG_PREFIX "failed to ioremap\n");
169 for (j = 0; j < i; j++) {
170 iounmap((void *) sbc8240_map[j].map_priv_1);
171 sbc8240_map[j].map_priv_1 = 0;
172 }
173 return -EIO;
174 }
175 simple_map_init(&sbc8240_mtd[i]);
176
177 sbc8240_mtd[i] = do_map_probe("jedec_probe", &sbc8240_map[i]);
178
179 if (sbc8240_mtd[i]) {
180 sbc8240_mtd[i]->module = THIS_MODULE;
181 devicesfound++;
182 } else {
183 if (sbc8240_map[i].map_priv_1) {
184 iounmap((void *) sbc8240_map[i].map_priv_1);
185 sbc8240_map[i].map_priv_1 = 0;
186 }
187 }
188 }
189
190 if (!devicesfound) {
191 printk(KERN_NOTICE MSG_PREFIX
192 "No suppported flash chips found!\n");
193 return -ENXIO;
194 }
195
196 #ifdef CONFIG_MTD_PARTITIONS
197 sbc8240_part_banks[0].mtd_part = sbc8240_uboot_partitions;
198 sbc8240_part_banks[0].type = "static image";
199 sbc8240_part_banks[0].nums = ARRAY_SIZE(sbc8240_uboot_partitions);
200 sbc8240_part_banks[1].mtd_part = sbc8240_fs_partitions;
201 sbc8240_part_banks[1].type = "static file system";
202 sbc8240_part_banks[1].nums = ARRAY_SIZE(sbc8240_fs_partitions);
203
204 for (i = 0; i < NUM_FLASH_BANKS; i++) {
205
206 if (!sbc8240_mtd[i]) continue;
207 if (sbc8240_part_banks[i].nums == 0) {
208 printk (KERN_NOTICE MSG_PREFIX
209 "No partition info available, registering whole device\n");
210 add_mtd_device(sbc8240_mtd[i]);
211 } else {
212 printk (KERN_NOTICE MSG_PREFIX
213 "Using %s partition definition\n", sbc8240_part_banks[i].mtd_part->name);
214 add_mtd_partitions (sbc8240_mtd[i],
215 sbc8240_part_banks[i].mtd_part,
216 sbc8240_part_banks[i].nums);
217 }
218 }
219 #else
220 printk(KERN_NOTICE MSG_PREFIX
221 "Registering %d flash banks at once\n", devicesfound);
222
223 for (i = 0; i < devicesfound; i++) {
224 add_mtd_device(sbc8240_mtd[i]);
225 }
226 #endif /* CONFIG_MTD_PARTITIONS */
227
228 return devicesfound == 0 ? -ENXIO : 0;
229 }
230
231 static void __exit cleanup_sbc8240_mtd (void)
232 {
233 int i;
234
235 for (i = 0; i < NUM_FLASH_BANKS; i++) {
236 if (sbc8240_mtd[i]) {
237 del_mtd_device (sbc8240_mtd[i]);
238 map_destroy (sbc8240_mtd[i]);
239 }
240 if (sbc8240_map[i].map_priv_1) {
241 iounmap ((void *) sbc8240_map[i].map_priv_1);
242 sbc8240_map[i].map_priv_1 = 0;
243 }
244 }
245 }
246
247 module_init (init_sbc8240_mtd);
248 module_exit (cleanup_sbc8240_mtd);
249
250 MODULE_LICENSE ("GPL");
251 MODULE_AUTHOR ("Carolyn Smith <carolyn.smith@tektronix.com>");
252 MODULE_DESCRIPTION ("MTD map driver for SBC8240 boards");
253
254
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