Commit | Line | Data |
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1da177e4 | 1 | /* |
69f34c98 | 2 | * Handle mapping of the flash memory access routines |
1da177e4 LT |
3 | * on TQM8xxL based devices. |
4 | * | |
1da177e4 LT |
5 | * based on rpxlite.c |
6 | * | |
7 | * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw> | |
8 | * | |
9 | * This code is GPLed | |
69f34c98 | 10 | * |
1da177e4 LT |
11 | */ |
12 | ||
13 | /* | |
14 | * According to TQM8xxL hardware manual, TQM8xxL series have | |
15 | * following flash memory organisations: | |
16 | * | capacity | | chip type | | bank0 | | bank1 | | |
17 | * 2MiB 512Kx16 2MiB 0 | |
18 | * 4MiB 1Mx16 4MiB 0 | |
19 | * 8MiB 1Mx16 4MiB 4MiB | |
69f34c98 | 20 | * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at |
1da177e4 LT |
21 | * kernel configuration. |
22 | */ | |
1da177e4 LT |
23 | #include <linux/module.h> |
24 | #include <linux/types.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/init.h> | |
4e57b681 | 27 | #include <linux/slab.h> |
1da177e4 LT |
28 | |
29 | #include <linux/mtd/mtd.h> | |
30 | #include <linux/mtd/map.h> | |
31 | #include <linux/mtd/partitions.h> | |
32 | ||
4e57b681 TS |
33 | #include <asm/io.h> |
34 | ||
1da177e4 LT |
35 | #define FLASH_ADDR 0x40000000 |
36 | #define FLASH_SIZE 0x00800000 | |
37 | #define FLASH_BANK_MAX 4 | |
38 | ||
39 | // trivial struct to describe partition information | |
40 | struct mtd_part_def | |
41 | { | |
42 | int nums; | |
43 | unsigned char *type; | |
44 | struct mtd_partition* mtd_part; | |
45 | }; | |
46 | ||
47 | //static struct mtd_info *mymtd; | |
48 | static struct mtd_info* mtd_banks[FLASH_BANK_MAX]; | |
49 | static struct map_info* map_banks[FLASH_BANK_MAX]; | |
50 | static struct mtd_part_def part_banks[FLASH_BANK_MAX]; | |
51 | static unsigned long num_banks; | |
52 | static void __iomem *start_scan_addr; | |
53 | ||
54 | /* | |
55 | * Here are partition information for all known TQM8xxL series devices. | |
56 | * See include/linux/mtd/partitions.h for definition of the mtd_partition | |
57 | * structure. | |
69f34c98 | 58 | * |
1da177e4 | 59 | * The *_max_flash_size is the maximum possible mapped flash size which |
69f34c98 | 60 | * is not necessarily the actual flash size. It must correspond to the |
1da177e4 LT |
61 | * value specified in the mapping definition defined by the |
62 | * "struct map_desc *_io_desc" for the corresponding machine. | |
63 | */ | |
64 | ||
25985edc | 65 | /* Currently, TQM8xxL has up to 8MiB flash */ |
1da177e4 LT |
66 | static unsigned long tqm8xxl_max_flash_size = 0x00800000; |
67 | ||
68 | /* partition definition for first flash bank | |
69 | * (cf. "drivers/char/flash_config.c") | |
70 | */ | |
71 | static struct mtd_partition tqm8xxl_partitions[] = { | |
72 | { | |
73 | .name = "ppcboot", | |
74 | .offset = 0x00000000, | |
75 | .size = 0x00020000, /* 128KB */ | |
76 | .mask_flags = MTD_WRITEABLE, /* force read-only */ | |
77 | }, | |
78 | { | |
79 | .name = "kernel", /* default kernel image */ | |
80 | .offset = 0x00020000, | |
81 | .size = 0x000e0000, | |
82 | .mask_flags = MTD_WRITEABLE, /* force read-only */ | |
83 | }, | |
84 | { | |
85 | .name = "user", | |
86 | .offset = 0x00100000, | |
87 | .size = 0x00100000, | |
88 | }, | |
89 | { | |
90 | .name = "initrd", | |
91 | .offset = 0x00200000, | |
92 | .size = 0x00200000, | |
93 | } | |
94 | }; | |
95 | /* partition definition for second flash bank */ | |
96 | static struct mtd_partition tqm8xxl_fs_partitions[] = { | |
97 | { | |
98 | .name = "cramfs", | |
99 | .offset = 0x00000000, | |
100 | .size = 0x00200000, | |
101 | }, | |
102 | { | |
103 | .name = "jffs", | |
104 | .offset = 0x00200000, | |
105 | .size = 0x00200000, | |
106 | //.size = MTDPART_SIZ_FULL, | |
107 | } | |
108 | }; | |
1da177e4 | 109 | |
e30bb9cf | 110 | static int __init init_tqm_mtd(void) |
1da177e4 LT |
111 | { |
112 | int idx = 0, ret = 0; | |
113 | unsigned long flash_addr, flash_size, mtd_size = 0; | |
114 | /* pointer to TQM8xxL board info data */ | |
115 | bd_t *bd = (bd_t *)__res; | |
116 | ||
117 | flash_addr = bd->bi_flashstart; | |
118 | flash_size = bd->bi_flashsize; | |
119 | ||
120 | //request maximum flash size address space | |
121 | start_scan_addr = ioremap(flash_addr, flash_size); | |
122 | if (!start_scan_addr) { | |
cb53b3b9 | 123 | printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __func__, flash_addr); |
1da177e4 LT |
124 | return -EIO; |
125 | } | |
126 | ||
127 | for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) { | |
128 | if(mtd_size >= flash_size) | |
129 | break; | |
69f34c98 | 130 | |
cb53b3b9 | 131 | printk(KERN_INFO "%s: chip probing count %d\n", __func__, idx); |
69f34c98 | 132 | |
95b93a0c | 133 | map_banks[idx] = kzalloc(sizeof(struct map_info), GFP_KERNEL); |
1da177e4 LT |
134 | if(map_banks[idx] == NULL) { |
135 | ret = -ENOMEM; | |
136 | /* FIXME: What if some MTD devices were probed already? */ | |
137 | goto error_mem; | |
138 | } | |
139 | ||
ce4a37f7 | 140 | map_banks[idx]->name = kmalloc(16, GFP_KERNEL); |
1da177e4 LT |
141 | |
142 | if (!map_banks[idx]->name) { | |
143 | ret = -ENOMEM; | |
144 | /* FIXME: What if some MTD devices were probed already? */ | |
145 | goto error_mem; | |
146 | } | |
147 | sprintf(map_banks[idx]->name, "TQM8xxL%d", idx); | |
148 | ||
149 | map_banks[idx]->size = flash_size; | |
150 | map_banks[idx]->bankwidth = 4; | |
151 | ||
152 | simple_map_init(map_banks[idx]); | |
153 | ||
154 | map_banks[idx]->virt = start_scan_addr; | |
155 | map_banks[idx]->phys = flash_addr; | |
156 | /* FIXME: This looks utterly bogus, but I'm trying to | |
157 | preserve the behaviour of the original (shown here)... | |
158 | ||
159 | map_banks[idx]->map_priv_1 = | |
160 | start_scan_addr + ((idx > 0) ? | |
161 | (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0); | |
162 | */ | |
163 | ||
164 | if (idx && mtd_banks[idx-1]) { | |
165 | map_banks[idx]->virt += mtd_banks[idx-1]->size; | |
166 | map_banks[idx]->phys += mtd_banks[idx-1]->size; | |
167 | } | |
168 | ||
169 | //start to probe flash chips | |
170 | mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]); | |
171 | ||
172 | if (mtd_banks[idx]) { | |
173 | mtd_banks[idx]->owner = THIS_MODULE; | |
174 | mtd_size += mtd_banks[idx]->size; | |
175 | num_banks++; | |
176 | ||
cb53b3b9 | 177 | printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __func__, num_banks, |
1da177e4 LT |
178 | mtd_banks[idx]->name, mtd_banks[idx]->size); |
179 | } | |
180 | } | |
181 | ||
182 | /* no supported flash chips found */ | |
183 | if (!num_banks) { | |
184 | printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n"); | |
185 | ret = -ENXIO; | |
186 | goto error_mem; | |
187 | } | |
188 | ||
1da177e4 LT |
189 | /* |
190 | * Select Static partition definitions | |
191 | */ | |
192 | part_banks[0].mtd_part = tqm8xxl_partitions; | |
193 | part_banks[0].type = "Static image"; | |
194 | part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions); | |
195 | ||
196 | part_banks[1].mtd_part = tqm8xxl_fs_partitions; | |
197 | part_banks[1].type = "Static file system"; | |
198 | part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions); | |
199 | ||
200 | for(idx = 0; idx < num_banks ; idx++) { | |
b5c0a4ea | 201 | if (part_banks[idx].nums == 0) |
1da177e4 | 202 | printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx); |
b5c0a4ea | 203 | else |
1da177e4 LT |
204 | printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n", |
205 | idx, part_banks[idx].type); | |
b5c0a4ea JI |
206 | mtd_device_register(mtd_banks[idx], part_banks[idx].mtd_part, |
207 | part_banks[idx].nums); | |
1da177e4 | 208 | } |
1da177e4 LT |
209 | return 0; |
210 | error_mem: | |
211 | for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) { | |
212 | if(map_banks[idx] != NULL) { | |
fa671646 JJ |
213 | kfree(map_banks[idx]->name); |
214 | map_banks[idx]->name = NULL; | |
1da177e4 LT |
215 | kfree(map_banks[idx]); |
216 | map_banks[idx] = NULL; | |
217 | } | |
218 | } | |
219 | error: | |
220 | iounmap(start_scan_addr); | |
221 | return ret; | |
222 | } | |
223 | ||
224 | static void __exit cleanup_tqm_mtd(void) | |
225 | { | |
226 | unsigned int idx = 0; | |
227 | for(idx = 0 ; idx < num_banks ; idx++) { | |
228 | /* destroy mtd_info previously allocated */ | |
229 | if (mtd_banks[idx]) { | |
b5c0a4ea | 230 | mtd_device_unregister(mtd_banks[idx]); |
1da177e4 LT |
231 | map_destroy(mtd_banks[idx]); |
232 | } | |
233 | /* release map_info not used anymore */ | |
234 | kfree(map_banks[idx]->name); | |
235 | kfree(map_banks[idx]); | |
236 | } | |
237 | ||
238 | if (start_scan_addr) { | |
239 | iounmap(start_scan_addr); | |
240 | start_scan_addr = 0; | |
241 | } | |
242 | } | |
243 | ||
244 | module_init(init_tqm_mtd); | |
245 | module_exit(cleanup_tqm_mtd); | |
246 | ||
247 | MODULE_LICENSE("GPL"); | |
248 | MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>"); | |
249 | MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards"); |