Commit | Line | Data |
---|---|---|
a2c2fe4b | 1 | /* |
c4d5e375 | 2 | * Flash mappings described by the OF (or flattened) device tree |
a2c2fe4b VW |
3 | * |
4 | * Copyright (C) 2006 MontaVista Software Inc. | |
5 | * Author: Vitaly Wool <vwool@ru.mvista.com> | |
6 | * | |
2099172d DG |
7 | * Revised to handle newer style flash binding by: |
8 | * Copyright (C) 2007 David Gibson, IBM Corporation. | |
9 | * | |
a2c2fe4b VW |
10 | * This program is free software; you can redistribute it and/or modify it |
11 | * under the terms of the GNU General Public License as published by the | |
12 | * Free Software Foundation; either version 2 of the License, or (at your | |
13 | * option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/types.h> | |
a2c2fe4b | 18 | #include <linux/init.h> |
a2c2fe4b VW |
19 | #include <linux/device.h> |
20 | #include <linux/mtd/mtd.h> | |
21 | #include <linux/mtd/map.h> | |
22 | #include <linux/mtd/partitions.h> | |
c4d5e375 DG |
23 | #include <linux/of.h> |
24 | #include <linux/of_platform.h> | |
a2c2fe4b | 25 | |
c4d5e375 | 26 | struct of_flash { |
a2c2fe4b VW |
27 | struct mtd_info *mtd; |
28 | struct map_info map; | |
29 | struct resource *res; | |
30 | #ifdef CONFIG_MTD_PARTITIONS | |
a2c2fe4b VW |
31 | struct mtd_partition *parts; |
32 | #endif | |
33 | }; | |
34 | ||
a2c2fe4b | 35 | #ifdef CONFIG_MTD_PARTITIONS |
c4d5e375 | 36 | #define OF_FLASH_PARTS(info) ((info)->parts) |
a2c2fe4b | 37 | |
2099172d | 38 | static int parse_obsolete_partitions(struct of_device *dev, |
c4d5e375 | 39 | struct of_flash *info, |
2099172d | 40 | struct device_node *dp) |
a2c2fe4b | 41 | { |
2099172d DG |
42 | int i, plen, nr_parts; |
43 | const struct { | |
44 | u32 offset, len; | |
45 | } *part; | |
46 | const char *names; | |
a2c2fe4b | 47 | |
2099172d DG |
48 | part = of_get_property(dp, "partitions", &plen); |
49 | if (!part) | |
c4d5e375 | 50 | return 0; /* No partitions found */ |
a2c2fe4b | 51 | |
2099172d DG |
52 | dev_warn(&dev->dev, "Device tree uses obsolete partition map binding\n"); |
53 | ||
54 | nr_parts = plen / sizeof(part[0]); | |
55 | ||
c4d5e375 DG |
56 | info->parts = kzalloc(nr_parts * sizeof(*info->parts), GFP_KERNEL); |
57 | if (!info->parts) | |
2099172d | 58 | return -ENOMEM; |
a2c2fe4b | 59 | |
2099172d | 60 | names = of_get_property(dp, "partition-names", &plen); |
a2c2fe4b | 61 | |
2099172d DG |
62 | for (i = 0; i < nr_parts; i++) { |
63 | info->parts[i].offset = part->offset; | |
64 | info->parts[i].size = part->len & ~1; | |
65 | if (part->len & 1) /* bit 0 set signifies read only partition */ | |
66 | info->parts[i].mask_flags = MTD_WRITEABLE; | |
a2c2fe4b | 67 | |
2099172d DG |
68 | if (names && (plen > 0)) { |
69 | int len = strlen(names) + 1; | |
a2c2fe4b | 70 | |
2099172d | 71 | info->parts[i].name = (char *)names; |
a2c2fe4b | 72 | plen -= len; |
2099172d DG |
73 | names += len; |
74 | } else { | |
75 | info->parts[i].name = "unnamed"; | |
76 | } | |
77 | ||
78 | part++; | |
a2c2fe4b | 79 | } |
2099172d DG |
80 | |
81 | return nr_parts; | |
a2c2fe4b | 82 | } |
2099172d | 83 | #else /* MTD_PARTITIONS */ |
c4d5e375 DG |
84 | #define OF_FLASH_PARTS(info) (0) |
85 | #define parse_partitions(info, dev) (0) | |
2099172d | 86 | #endif /* MTD_PARTITIONS */ |
a2c2fe4b | 87 | |
c4d5e375 | 88 | static int of_flash_remove(struct of_device *dev) |
a2c2fe4b | 89 | { |
c4d5e375 | 90 | struct of_flash *info; |
a2c2fe4b VW |
91 | |
92 | info = dev_get_drvdata(&dev->dev); | |
c4d5e375 | 93 | if (!info) |
a2c2fe4b VW |
94 | return 0; |
95 | dev_set_drvdata(&dev->dev, NULL); | |
96 | ||
c4d5e375 DG |
97 | if (info->mtd) { |
98 | if (OF_FLASH_PARTS(info)) { | |
a2c2fe4b | 99 | del_mtd_partitions(info->mtd); |
c4d5e375 | 100 | kfree(OF_FLASH_PARTS(info)); |
a2c2fe4b VW |
101 | } else { |
102 | del_mtd_device(info->mtd); | |
103 | } | |
a2c2fe4b VW |
104 | map_destroy(info->mtd); |
105 | } | |
106 | ||
c4d5e375 | 107 | if (info->map.virt) |
a2c2fe4b VW |
108 | iounmap(info->map.virt); |
109 | ||
c4d5e375 | 110 | if (info->res) { |
a2c2fe4b VW |
111 | release_resource(info->res); |
112 | kfree(info->res); | |
113 | } | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
2099172d DG |
118 | /* Helper function to handle probing of the obsolete "direct-mapped" |
119 | * compatible binding, which has an extra "probe-type" property | |
120 | * describing the type of flash probe necessary. */ | |
121 | static struct mtd_info * __devinit obsolete_probe(struct of_device *dev, | |
122 | struct map_info *map) | |
a2c2fe4b VW |
123 | { |
124 | struct device_node *dp = dev->node; | |
a2c2fe4b | 125 | const char *of_probe; |
2099172d DG |
126 | struct mtd_info *mtd; |
127 | static const char *rom_probe_types[] | |
128 | = { "cfi_probe", "jedec_probe", "map_rom"}; | |
129 | int i; | |
130 | ||
131 | dev_warn(&dev->dev, "Device tree uses obsolete \"direct-mapped\" " | |
132 | "flash binding\n"); | |
133 | ||
134 | of_probe = of_get_property(dp, "probe-type", NULL); | |
135 | if (!of_probe) { | |
136 | for (i = 0; i < ARRAY_SIZE(rom_probe_types); i++) { | |
137 | mtd = do_map_probe(rom_probe_types[i], map); | |
138 | if (mtd) | |
139 | return mtd; | |
140 | } | |
141 | return NULL; | |
142 | } else if (strcmp(of_probe, "CFI") == 0) { | |
143 | return do_map_probe("cfi_probe", map); | |
144 | } else if (strcmp(of_probe, "JEDEC") == 0) { | |
145 | return do_map_probe("jedec_probe", map); | |
146 | } else { | |
147 | if (strcmp(of_probe, "ROM") != 0) | |
c4d5e375 DG |
148 | dev_warn(&dev->dev, "obsolete_probe: don't know probe " |
149 | "type '%s', mapping as rom\n", of_probe); | |
2099172d DG |
150 | return do_map_probe("mtd_rom", map); |
151 | } | |
152 | } | |
153 | ||
c4d5e375 DG |
154 | static int __devinit of_flash_probe(struct of_device *dev, |
155 | const struct of_device_id *match) | |
a2c2fe4b | 156 | { |
9a310d21 SW |
157 | #ifdef CONFIG_MTD_PARTITIONS |
158 | static const char *part_probe_types[] | |
159 | = { "cmdlinepart", "RedBoot", NULL }; | |
160 | #endif | |
a2c2fe4b VW |
161 | struct device_node *dp = dev->node; |
162 | struct resource res; | |
c4d5e375 DG |
163 | struct of_flash *info; |
164 | const char *probe_type = match->data; | |
a2c2fe4b VW |
165 | const u32 *width; |
166 | int err; | |
167 | ||
c4d5e375 | 168 | err = -ENXIO; |
a2c2fe4b | 169 | if (of_address_to_resource(dp, 0, &res)) { |
c4d5e375 | 170 | dev_err(&dev->dev, "Can't get IO address from device tree\n"); |
a2c2fe4b VW |
171 | goto err_out; |
172 | } | |
173 | ||
c4d5e375 DG |
174 | dev_dbg(&dev->dev, "of_flash device: %.8llx-%.8llx\n", |
175 | (unsigned long long)res.start, (unsigned long long)res.end); | |
a2c2fe4b | 176 | |
c4d5e375 DG |
177 | err = -ENOMEM; |
178 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
179 | if (!info) | |
a2c2fe4b | 180 | goto err_out; |
a2c2fe4b VW |
181 | |
182 | dev_set_drvdata(&dev->dev, info); | |
183 | ||
c4d5e375 | 184 | err = -EBUSY; |
a2c2fe4b | 185 | info->res = request_mem_region(res.start, res.end - res.start + 1, |
475b44c1 | 186 | dev_name(&dev->dev)); |
c4d5e375 | 187 | if (!info->res) |
a2c2fe4b | 188 | goto err_out; |
a2c2fe4b | 189 | |
c4d5e375 | 190 | err = -ENXIO; |
40cd3a45 | 191 | width = of_get_property(dp, "bank-width", NULL); |
c4d5e375 DG |
192 | if (!width) { |
193 | dev_err(&dev->dev, "Can't get bank width from device tree\n"); | |
a2c2fe4b VW |
194 | goto err_out; |
195 | } | |
196 | ||
475b44c1 | 197 | info->map.name = dev_name(&dev->dev); |
a2c2fe4b VW |
198 | info->map.phys = res.start; |
199 | info->map.size = res.end - res.start + 1; | |
200 | info->map.bankwidth = *width; | |
201 | ||
c4d5e375 | 202 | err = -ENOMEM; |
a2c2fe4b | 203 | info->map.virt = ioremap(info->map.phys, info->map.size); |
c4d5e375 DG |
204 | if (!info->map.virt) { |
205 | dev_err(&dev->dev, "Failed to ioremap() flash region\n"); | |
a2c2fe4b VW |
206 | goto err_out; |
207 | } | |
208 | ||
209 | simple_map_init(&info->map); | |
210 | ||
2099172d DG |
211 | if (probe_type) |
212 | info->mtd = do_map_probe(probe_type, &info->map); | |
213 | else | |
214 | info->mtd = obsolete_probe(dev, &info->map); | |
215 | ||
c4d5e375 DG |
216 | err = -ENXIO; |
217 | if (!info->mtd) { | |
218 | dev_err(&dev->dev, "do_map_probe() failed\n"); | |
a2c2fe4b VW |
219 | goto err_out; |
220 | } | |
221 | info->mtd->owner = THIS_MODULE; | |
db99a552 | 222 | info->mtd->dev.parent = &dev->dev; |
a2c2fe4b | 223 | |
9a310d21 SW |
224 | #ifdef CONFIG_MTD_PARTITIONS |
225 | /* First look for RedBoot table or partitions on the command | |
226 | * line, these take precedence over device tree information */ | |
227 | err = parse_mtd_partitions(info->mtd, part_probe_types, | |
228 | &info->parts, 0); | |
c4d5e375 | 229 | if (err < 0) |
9a310d21 SW |
230 | return err; |
231 | ||
232 | #ifdef CONFIG_MTD_OF_PARTS | |
233 | if (err == 0) { | |
69fd3a8d | 234 | err = of_mtd_parse_partitions(&dev->dev, dp, &info->parts); |
9a310d21 SW |
235 | if (err < 0) |
236 | return err; | |
237 | } | |
238 | #endif | |
239 | ||
240 | if (err == 0) { | |
241 | err = parse_obsolete_partitions(dev, info, dp); | |
242 | if (err < 0) | |
243 | return err; | |
244 | } | |
a2c2fe4b | 245 | |
c4d5e375 | 246 | if (err > 0) |
9a310d21 | 247 | add_mtd_partitions(info->mtd, info->parts, err); |
c4d5e375 | 248 | else |
9a310d21 | 249 | #endif |
c4d5e375 | 250 | add_mtd_device(info->mtd); |
a2c2fe4b | 251 | |
a2c2fe4b VW |
252 | return 0; |
253 | ||
254 | err_out: | |
c4d5e375 | 255 | of_flash_remove(dev); |
a2c2fe4b | 256 | return err; |
a2c2fe4b VW |
257 | } |
258 | ||
c4d5e375 | 259 | static struct of_device_id of_flash_match[] = { |
2099172d DG |
260 | { |
261 | .compatible = "cfi-flash", | |
262 | .data = (void *)"cfi_probe", | |
263 | }, | |
264 | { | |
265 | /* FIXME: JEDEC chips can't be safely and reliably | |
266 | * probed, although the mtd code gets it right in | |
267 | * practice most of the time. We should use the | |
268 | * vendor and device ids specified by the binding to | |
269 | * bypass the heuristic probe code, but the mtd layer | |
270 | * provides, at present, no interface for doing so | |
271 | * :(. */ | |
272 | .compatible = "jedec-flash", | |
273 | .data = (void *)"jedec_probe", | |
274 | }, | |
a2c2fe4b VW |
275 | { |
276 | .type = "rom", | |
277 | .compatible = "direct-mapped" | |
278 | }, | |
279 | { }, | |
280 | }; | |
c4d5e375 | 281 | MODULE_DEVICE_TABLE(of, of_flash_match); |
a2c2fe4b | 282 | |
c4d5e375 DG |
283 | static struct of_platform_driver of_flash_driver = { |
284 | .name = "of-flash", | |
285 | .match_table = of_flash_match, | |
286 | .probe = of_flash_probe, | |
287 | .remove = of_flash_remove, | |
a2c2fe4b VW |
288 | }; |
289 | ||
c4d5e375 | 290 | static int __init of_flash_init(void) |
a2c2fe4b | 291 | { |
c4d5e375 | 292 | return of_register_platform_driver(&of_flash_driver); |
a2c2fe4b VW |
293 | } |
294 | ||
c4d5e375 | 295 | static void __exit of_flash_exit(void) |
a2c2fe4b | 296 | { |
c4d5e375 | 297 | of_unregister_platform_driver(&of_flash_driver); |
a2c2fe4b VW |
298 | } |
299 | ||
c4d5e375 DG |
300 | module_init(of_flash_init); |
301 | module_exit(of_flash_exit); | |
a2c2fe4b VW |
302 | |
303 | MODULE_LICENSE("GPL"); | |
304 | MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>"); | |
c4d5e375 | 305 | MODULE_DESCRIPTION("Device tree based MTD map driver"); |