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1da177e4 | 1 | /* |
69f34c98 | 2 | * Handle mapping of the flash memory access routines |
1da177e4 LT |
3 | * on TQM8xxL based devices. |
4 | * | |
69f34c98 | 5 | * $Id: tqm8xxl.c,v 1.15 2005/11/07 11:14:28 gleixner Exp $ |
1da177e4 LT |
6 | * |
7 | * based on rpxlite.c | |
8 | * | |
9 | * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw> | |
10 | * | |
11 | * This code is GPLed | |
69f34c98 | 12 | * |
1da177e4 LT |
13 | */ |
14 | ||
15 | /* | |
16 | * According to TQM8xxL hardware manual, TQM8xxL series have | |
17 | * following flash memory organisations: | |
18 | * | capacity | | chip type | | bank0 | | bank1 | | |
19 | * 2MiB 512Kx16 2MiB 0 | |
20 | * 4MiB 1Mx16 4MiB 0 | |
21 | * 8MiB 1Mx16 4MiB 4MiB | |
69f34c98 | 22 | * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at |
1da177e4 LT |
23 | * kernel configuration. |
24 | */ | |
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/types.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/init.h> | |
4e57b681 | 29 | #include <linux/slab.h> |
1da177e4 LT |
30 | |
31 | #include <linux/mtd/mtd.h> | |
32 | #include <linux/mtd/map.h> | |
33 | #include <linux/mtd/partitions.h> | |
34 | ||
4e57b681 TS |
35 | #include <asm/io.h> |
36 | ||
1da177e4 LT |
37 | #define FLASH_ADDR 0x40000000 |
38 | #define FLASH_SIZE 0x00800000 | |
39 | #define FLASH_BANK_MAX 4 | |
40 | ||
41 | // trivial struct to describe partition information | |
42 | struct mtd_part_def | |
43 | { | |
44 | int nums; | |
45 | unsigned char *type; | |
46 | struct mtd_partition* mtd_part; | |
47 | }; | |
48 | ||
49 | //static struct mtd_info *mymtd; | |
50 | static struct mtd_info* mtd_banks[FLASH_BANK_MAX]; | |
51 | static struct map_info* map_banks[FLASH_BANK_MAX]; | |
52 | static struct mtd_part_def part_banks[FLASH_BANK_MAX]; | |
53 | static unsigned long num_banks; | |
54 | static void __iomem *start_scan_addr; | |
55 | ||
56 | /* | |
57 | * Here are partition information for all known TQM8xxL series devices. | |
58 | * See include/linux/mtd/partitions.h for definition of the mtd_partition | |
59 | * structure. | |
69f34c98 | 60 | * |
1da177e4 | 61 | * The *_max_flash_size is the maximum possible mapped flash size which |
69f34c98 | 62 | * is not necessarily the actual flash size. It must correspond to the |
1da177e4 LT |
63 | * value specified in the mapping definition defined by the |
64 | * "struct map_desc *_io_desc" for the corresponding machine. | |
65 | */ | |
66 | ||
67 | #ifdef CONFIG_MTD_PARTITIONS | |
68 | /* Currently, TQM8xxL has upto 8MiB flash */ | |
69 | static unsigned long tqm8xxl_max_flash_size = 0x00800000; | |
70 | ||
71 | /* partition definition for first flash bank | |
72 | * (cf. "drivers/char/flash_config.c") | |
73 | */ | |
74 | static struct mtd_partition tqm8xxl_partitions[] = { | |
75 | { | |
76 | .name = "ppcboot", | |
77 | .offset = 0x00000000, | |
78 | .size = 0x00020000, /* 128KB */ | |
79 | .mask_flags = MTD_WRITEABLE, /* force read-only */ | |
80 | }, | |
81 | { | |
82 | .name = "kernel", /* default kernel image */ | |
83 | .offset = 0x00020000, | |
84 | .size = 0x000e0000, | |
85 | .mask_flags = MTD_WRITEABLE, /* force read-only */ | |
86 | }, | |
87 | { | |
88 | .name = "user", | |
89 | .offset = 0x00100000, | |
90 | .size = 0x00100000, | |
91 | }, | |
92 | { | |
93 | .name = "initrd", | |
94 | .offset = 0x00200000, | |
95 | .size = 0x00200000, | |
96 | } | |
97 | }; | |
98 | /* partition definition for second flash bank */ | |
99 | static struct mtd_partition tqm8xxl_fs_partitions[] = { | |
100 | { | |
101 | .name = "cramfs", | |
102 | .offset = 0x00000000, | |
103 | .size = 0x00200000, | |
104 | }, | |
105 | { | |
106 | .name = "jffs", | |
107 | .offset = 0x00200000, | |
108 | .size = 0x00200000, | |
109 | //.size = MTDPART_SIZ_FULL, | |
110 | } | |
111 | }; | |
112 | #endif | |
113 | ||
114 | int __init init_tqm_mtd(void) | |
115 | { | |
116 | int idx = 0, ret = 0; | |
117 | unsigned long flash_addr, flash_size, mtd_size = 0; | |
118 | /* pointer to TQM8xxL board info data */ | |
119 | bd_t *bd = (bd_t *)__res; | |
120 | ||
121 | flash_addr = bd->bi_flashstart; | |
122 | flash_size = bd->bi_flashsize; | |
123 | ||
124 | //request maximum flash size address space | |
125 | start_scan_addr = ioremap(flash_addr, flash_size); | |
126 | if (!start_scan_addr) { | |
127 | printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __FUNCTION__, flash_addr); | |
128 | return -EIO; | |
129 | } | |
130 | ||
131 | for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) { | |
132 | if(mtd_size >= flash_size) | |
133 | break; | |
69f34c98 | 134 | |
1da177e4 | 135 | printk(KERN_INFO "%s: chip probing count %d\n", __FUNCTION__, idx); |
69f34c98 | 136 | |
1da177e4 LT |
137 | map_banks[idx] = (struct map_info *)kmalloc(sizeof(struct map_info), GFP_KERNEL); |
138 | if(map_banks[idx] == NULL) { | |
139 | ret = -ENOMEM; | |
140 | /* FIXME: What if some MTD devices were probed already? */ | |
141 | goto error_mem; | |
142 | } | |
143 | ||
144 | memset((void *)map_banks[idx], 0, sizeof(struct map_info)); | |
145 | map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL); | |
146 | ||
147 | if (!map_banks[idx]->name) { | |
148 | ret = -ENOMEM; | |
149 | /* FIXME: What if some MTD devices were probed already? */ | |
150 | goto error_mem; | |
151 | } | |
152 | sprintf(map_banks[idx]->name, "TQM8xxL%d", idx); | |
153 | ||
154 | map_banks[idx]->size = flash_size; | |
155 | map_banks[idx]->bankwidth = 4; | |
156 | ||
157 | simple_map_init(map_banks[idx]); | |
158 | ||
159 | map_banks[idx]->virt = start_scan_addr; | |
160 | map_banks[idx]->phys = flash_addr; | |
161 | /* FIXME: This looks utterly bogus, but I'm trying to | |
162 | preserve the behaviour of the original (shown here)... | |
163 | ||
164 | map_banks[idx]->map_priv_1 = | |
165 | start_scan_addr + ((idx > 0) ? | |
166 | (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0); | |
167 | */ | |
168 | ||
169 | if (idx && mtd_banks[idx-1]) { | |
170 | map_banks[idx]->virt += mtd_banks[idx-1]->size; | |
171 | map_banks[idx]->phys += mtd_banks[idx-1]->size; | |
172 | } | |
173 | ||
174 | //start to probe flash chips | |
175 | mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]); | |
176 | ||
177 | if (mtd_banks[idx]) { | |
178 | mtd_banks[idx]->owner = THIS_MODULE; | |
179 | mtd_size += mtd_banks[idx]->size; | |
180 | num_banks++; | |
181 | ||
69f34c98 | 182 | printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks, |
1da177e4 LT |
183 | mtd_banks[idx]->name, mtd_banks[idx]->size); |
184 | } | |
185 | } | |
186 | ||
187 | /* no supported flash chips found */ | |
188 | if (!num_banks) { | |
189 | printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n"); | |
190 | ret = -ENXIO; | |
191 | goto error_mem; | |
192 | } | |
193 | ||
194 | #ifdef CONFIG_MTD_PARTITIONS | |
195 | /* | |
196 | * Select Static partition definitions | |
197 | */ | |
198 | part_banks[0].mtd_part = tqm8xxl_partitions; | |
199 | part_banks[0].type = "Static image"; | |
200 | part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions); | |
201 | ||
202 | part_banks[1].mtd_part = tqm8xxl_fs_partitions; | |
203 | part_banks[1].type = "Static file system"; | |
204 | part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions); | |
205 | ||
206 | for(idx = 0; idx < num_banks ; idx++) { | |
207 | if (part_banks[idx].nums == 0) { | |
208 | printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx); | |
209 | add_mtd_device(mtd_banks[idx]); | |
210 | } else { | |
211 | printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n", | |
212 | idx, part_banks[idx].type); | |
69f34c98 | 213 | add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part, |
1da177e4 LT |
214 | part_banks[idx].nums); |
215 | } | |
216 | } | |
217 | #else | |
218 | printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks); | |
219 | for(idx = 0 ; idx < num_banks ; idx++) | |
220 | add_mtd_device(mtd_banks[idx]); | |
221 | #endif | |
222 | return 0; | |
223 | error_mem: | |
224 | for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) { | |
225 | if(map_banks[idx] != NULL) { | |
fa671646 JJ |
226 | kfree(map_banks[idx]->name); |
227 | map_banks[idx]->name = NULL; | |
1da177e4 LT |
228 | kfree(map_banks[idx]); |
229 | map_banks[idx] = NULL; | |
230 | } | |
231 | } | |
232 | error: | |
233 | iounmap(start_scan_addr); | |
234 | return ret; | |
235 | } | |
236 | ||
237 | static void __exit cleanup_tqm_mtd(void) | |
238 | { | |
239 | unsigned int idx = 0; | |
240 | for(idx = 0 ; idx < num_banks ; idx++) { | |
241 | /* destroy mtd_info previously allocated */ | |
242 | if (mtd_banks[idx]) { | |
243 | del_mtd_partitions(mtd_banks[idx]); | |
244 | map_destroy(mtd_banks[idx]); | |
245 | } | |
246 | /* release map_info not used anymore */ | |
247 | kfree(map_banks[idx]->name); | |
248 | kfree(map_banks[idx]); | |
249 | } | |
250 | ||
251 | if (start_scan_addr) { | |
252 | iounmap(start_scan_addr); | |
253 | start_scan_addr = 0; | |
254 | } | |
255 | } | |
256 | ||
257 | module_init(init_tqm_mtd); | |
258 | module_exit(cleanup_tqm_mtd); | |
259 | ||
260 | MODULE_LICENSE("GPL"); | |
261 | MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>"); | |
262 | MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards"); |