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> | |
143070e7 | 23 | #include <linux/mtd/concat.h> |
c4d5e375 | 24 | #include <linux/of.h> |
7a50d06e | 25 | #include <linux/of_address.h> |
c4d5e375 | 26 | #include <linux/of_platform.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
a2c2fe4b | 28 | |
143070e7 SR |
29 | struct of_flash_list { |
30 | struct mtd_info *mtd; | |
31 | struct map_info map; | |
32 | struct resource *res; | |
33 | }; | |
34 | ||
c4d5e375 | 35 | struct of_flash { |
143070e7 | 36 | struct mtd_info *cmtd; |
143070e7 SR |
37 | int list_size; /* number of elements in of_flash_list */ |
38 | struct of_flash_list list[0]; | |
a2c2fe4b VW |
39 | }; |
40 | ||
2dc11581 | 41 | static int of_flash_remove(struct platform_device *dev) |
a2c2fe4b | 42 | { |
c4d5e375 | 43 | struct of_flash *info; |
143070e7 | 44 | int i; |
a2c2fe4b VW |
45 | |
46 | info = dev_get_drvdata(&dev->dev); | |
c4d5e375 | 47 | if (!info) |
a2c2fe4b VW |
48 | return 0; |
49 | dev_set_drvdata(&dev->dev, NULL); | |
50 | ||
143070e7 | 51 | if (info->cmtd != info->list[0].mtd) { |
984e6d8e | 52 | mtd_device_unregister(info->cmtd); |
143070e7 SR |
53 | mtd_concat_destroy(info->cmtd); |
54 | } | |
143070e7 | 55 | |
f44dcbd0 | 56 | if (info->cmtd) |
984e6d8e | 57 | mtd_device_unregister(info->cmtd); |
a2c2fe4b | 58 | |
143070e7 SR |
59 | for (i = 0; i < info->list_size; i++) { |
60 | if (info->list[i].mtd) | |
61 | map_destroy(info->list[i].mtd); | |
a2c2fe4b | 62 | |
143070e7 SR |
63 | if (info->list[i].map.virt) |
64 | iounmap(info->list[i].map.virt); | |
65 | ||
66 | if (info->list[i].res) { | |
67 | release_resource(info->list[i].res); | |
68 | kfree(info->list[i].res); | |
69 | } | |
a2c2fe4b VW |
70 | } |
71 | ||
143070e7 SR |
72 | kfree(info); |
73 | ||
a2c2fe4b VW |
74 | return 0; |
75 | } | |
76 | ||
2099172d DG |
77 | /* Helper function to handle probing of the obsolete "direct-mapped" |
78 | * compatible binding, which has an extra "probe-type" property | |
79 | * describing the type of flash probe necessary. */ | |
06f25510 | 80 | static struct mtd_info *obsolete_probe(struct platform_device *dev, |
d8929942 | 81 | struct map_info *map) |
a2c2fe4b | 82 | { |
61c7a080 | 83 | struct device_node *dp = dev->dev.of_node; |
a2c2fe4b | 84 | const char *of_probe; |
2099172d DG |
85 | struct mtd_info *mtd; |
86 | static const char *rom_probe_types[] | |
87 | = { "cfi_probe", "jedec_probe", "map_rom"}; | |
88 | int i; | |
89 | ||
90 | dev_warn(&dev->dev, "Device tree uses obsolete \"direct-mapped\" " | |
91 | "flash binding\n"); | |
92 | ||
93 | of_probe = of_get_property(dp, "probe-type", NULL); | |
94 | if (!of_probe) { | |
95 | for (i = 0; i < ARRAY_SIZE(rom_probe_types); i++) { | |
96 | mtd = do_map_probe(rom_probe_types[i], map); | |
97 | if (mtd) | |
98 | return mtd; | |
99 | } | |
100 | return NULL; | |
101 | } else if (strcmp(of_probe, "CFI") == 0) { | |
102 | return do_map_probe("cfi_probe", map); | |
103 | } else if (strcmp(of_probe, "JEDEC") == 0) { | |
104 | return do_map_probe("jedec_probe", map); | |
105 | } else { | |
106 | if (strcmp(of_probe, "ROM") != 0) | |
c4d5e375 DG |
107 | dev_warn(&dev->dev, "obsolete_probe: don't know probe " |
108 | "type '%s', mapping as rom\n", of_probe); | |
2099172d DG |
109 | return do_map_probe("mtd_rom", map); |
110 | } | |
111 | } | |
112 | ||
9d5da3a9 JG |
113 | /* When partitions are set we look for a linux,part-probe property which |
114 | specifies the list of partition probers to use. If none is given then the | |
115 | default is use. These take precedence over other device tree | |
116 | information. */ | |
5f4ba9f9 | 117 | static const char *part_probe_types_def[] = { "cmdlinepart", "RedBoot", |
fbcf62a3 | 118 | "ofpart", "ofoldpart", NULL }; |
06f25510 | 119 | static const char **of_get_probes(struct device_node *dp) |
9d5da3a9 JG |
120 | { |
121 | const char *cp; | |
122 | int cplen; | |
123 | unsigned int l; | |
124 | unsigned int count; | |
125 | const char **res; | |
126 | ||
127 | cp = of_get_property(dp, "linux,part-probe", &cplen); | |
128 | if (cp == NULL) | |
129 | return part_probe_types_def; | |
130 | ||
131 | count = 0; | |
132 | for (l = 0; l != cplen; l++) | |
133 | if (cp[l] == 0) | |
134 | count++; | |
135 | ||
136 | res = kzalloc((count + 1)*sizeof(*res), GFP_KERNEL); | |
137 | count = 0; | |
138 | while (cplen > 0) { | |
139 | res[count] = cp; | |
140 | l = strlen(cp) + 1; | |
141 | cp += l; | |
142 | cplen -= l; | |
143 | count++; | |
144 | } | |
145 | return res; | |
146 | } | |
147 | ||
06f25510 | 148 | static void of_free_probes(const char **probes) |
9d5da3a9 JG |
149 | { |
150 | if (probes != part_probe_types_def) | |
151 | kfree(probes); | |
152 | } | |
9d5da3a9 | 153 | |
b1608d69 | 154 | static struct of_device_id of_flash_match[]; |
06f25510 | 155 | static int of_flash_probe(struct platform_device *dev) |
a2c2fe4b | 156 | { |
9d5da3a9 | 157 | const char **part_probe_types; |
b1608d69 | 158 | const struct of_device_id *match; |
61c7a080 | 159 | struct device_node *dp = dev->dev.of_node; |
a2c2fe4b | 160 | struct resource res; |
c4d5e375 | 161 | struct of_flash *info; |
1c48a5c9 | 162 | const char *probe_type; |
766f271a | 163 | const __be32 *width; |
a2c2fe4b | 164 | int err; |
143070e7 SR |
165 | int i; |
166 | int count; | |
766f271a | 167 | const __be32 *p; |
143070e7 SR |
168 | int reg_tuple_size; |
169 | struct mtd_info **mtd_list = NULL; | |
2763c508 | 170 | resource_size_t res_size; |
5f4ba9f9 | 171 | struct mtd_part_parser_data ppdata; |
d0788ce4 | 172 | bool map_indirect; |
7dfe4be3 | 173 | const char *mtd_name = NULL; |
143070e7 | 174 | |
b1608d69 GL |
175 | match = of_match_device(of_flash_match, &dev->dev); |
176 | if (!match) | |
1c48a5c9 | 177 | return -EINVAL; |
b1608d69 | 178 | probe_type = match->data; |
1c48a5c9 | 179 | |
143070e7 SR |
180 | reg_tuple_size = (of_n_addr_cells(dp) + of_n_size_cells(dp)) * sizeof(u32); |
181 | ||
d68cbdd4 JCPV |
182 | of_property_read_string(dp, "linux,mtd-name", &mtd_name); |
183 | ||
143070e7 SR |
184 | /* |
185 | * Get number of "reg" tuples. Scan for MTD devices on area's | |
186 | * described by each "reg" region. This makes it possible (including | |
187 | * the concat support) to support the Intel P30 48F4400 chips which | |
188 | * consists internally of 2 non-identical NOR chips on one die. | |
189 | */ | |
190 | p = of_get_property(dp, "reg", &count); | |
191 | if (count % reg_tuple_size != 0) { | |
192 | dev_err(&dev->dev, "Malformed reg property on %s\n", | |
61c7a080 | 193 | dev->dev.of_node->full_name); |
143070e7 | 194 | err = -EINVAL; |
ad4fbc79 | 195 | goto err_flash_remove; |
a2c2fe4b | 196 | } |
143070e7 | 197 | count /= reg_tuple_size; |
a2c2fe4b | 198 | |
d0788ce4 SR |
199 | map_indirect = of_property_read_bool(dp, "no-unaligned-direct-access"); |
200 | ||
c4d5e375 | 201 | err = -ENOMEM; |
143070e7 SR |
202 | info = kzalloc(sizeof(struct of_flash) + |
203 | sizeof(struct of_flash_list) * count, GFP_KERNEL); | |
204 | if (!info) | |
ad4fbc79 | 205 | goto err_flash_remove; |
a2c2fe4b VW |
206 | |
207 | dev_set_drvdata(&dev->dev, info); | |
208 | ||
e026255f | 209 | mtd_list = kzalloc(sizeof(*mtd_list) * count, GFP_KERNEL); |
ad4fbc79 | 210 | if (!mtd_list) |
211 | goto err_flash_remove; | |
212 | ||
143070e7 SR |
213 | for (i = 0; i < count; i++) { |
214 | err = -ENXIO; | |
215 | if (of_address_to_resource(dp, i, &res)) { | |
940fe282 SR |
216 | /* |
217 | * Continue with next register tuple if this | |
218 | * one is not mappable | |
219 | */ | |
220 | continue; | |
143070e7 | 221 | } |
a2c2fe4b | 222 | |
f9a5279c | 223 | dev_dbg(&dev->dev, "of_flash device: %pR\n", &res); |
143070e7 SR |
224 | |
225 | err = -EBUSY; | |
2763c508 WS |
226 | res_size = resource_size(&res); |
227 | info->list[i].res = request_mem_region(res.start, res_size, | |
143070e7 SR |
228 | dev_name(&dev->dev)); |
229 | if (!info->list[i].res) | |
230 | goto err_out; | |
231 | ||
232 | err = -ENXIO; | |
233 | width = of_get_property(dp, "bank-width", NULL); | |
234 | if (!width) { | |
235 | dev_err(&dev->dev, "Can't get bank width from device" | |
236 | " tree\n"); | |
237 | goto err_out; | |
238 | } | |
a2c2fe4b | 239 | |
d68cbdd4 | 240 | info->list[i].map.name = mtd_name ?: dev_name(&dev->dev); |
143070e7 | 241 | info->list[i].map.phys = res.start; |
2763c508 | 242 | info->list[i].map.size = res_size; |
766f271a | 243 | info->list[i].map.bankwidth = be32_to_cpup(width); |
143070e7 SR |
244 | |
245 | err = -ENOMEM; | |
246 | info->list[i].map.virt = ioremap(info->list[i].map.phys, | |
247 | info->list[i].map.size); | |
248 | if (!info->list[i].map.virt) { | |
249 | dev_err(&dev->dev, "Failed to ioremap() flash" | |
250 | " region\n"); | |
251 | goto err_out; | |
252 | } | |
a2c2fe4b | 253 | |
143070e7 | 254 | simple_map_init(&info->list[i].map); |
a2c2fe4b | 255 | |
d0788ce4 SR |
256 | /* |
257 | * On some platforms (e.g. MPC5200) a direct 1:1 mapping | |
258 | * may cause problems with JFFS2 usage, as the local bus (LPB) | |
259 | * doesn't support unaligned accesses as implemented in the | |
260 | * JFFS2 code via memcpy(). By setting NO_XIP, the | |
261 | * flash will not be exposed directly to the MTD users | |
262 | * (e.g. JFFS2) any more. | |
263 | */ | |
264 | if (map_indirect) | |
265 | info->list[i].map.phys = NO_XIP; | |
266 | ||
143070e7 SR |
267 | if (probe_type) { |
268 | info->list[i].mtd = do_map_probe(probe_type, | |
269 | &info->list[i].map); | |
270 | } else { | |
271 | info->list[i].mtd = obsolete_probe(dev, | |
272 | &info->list[i].map); | |
273 | } | |
274 | mtd_list[i] = info->list[i].mtd; | |
a2c2fe4b | 275 | |
143070e7 SR |
276 | err = -ENXIO; |
277 | if (!info->list[i].mtd) { | |
278 | dev_err(&dev->dev, "do_map_probe() failed\n"); | |
279 | goto err_out; | |
280 | } else { | |
281 | info->list_size++; | |
282 | } | |
283 | info->list[i].mtd->owner = THIS_MODULE; | |
284 | info->list[i].mtd->dev.parent = &dev->dev; | |
285 | } | |
2099172d | 286 | |
143070e7 | 287 | err = 0; |
e58a66d8 | 288 | info->cmtd = NULL; |
143070e7 SR |
289 | if (info->list_size == 1) { |
290 | info->cmtd = info->list[0].mtd; | |
291 | } else if (info->list_size > 1) { | |
292 | /* | |
293 | * We detected multiple devices. Concatenate them together. | |
294 | */ | |
143070e7 SR |
295 | info->cmtd = mtd_concat_create(mtd_list, info->list_size, |
296 | dev_name(&dev->dev)); | |
a2c2fe4b | 297 | } |
e58a66d8 AP |
298 | if (info->cmtd == NULL) |
299 | err = -ENXIO; | |
300 | ||
143070e7 SR |
301 | if (err) |
302 | goto err_out; | |
a2c2fe4b | 303 | |
5f4ba9f9 | 304 | ppdata.of_node = dp; |
9d5da3a9 | 305 | part_probe_types = of_get_probes(dp); |
f44dcbd0 DES |
306 | mtd_device_parse_register(info->cmtd, part_probe_types, &ppdata, |
307 | NULL, 0); | |
9d5da3a9 | 308 | of_free_probes(part_probe_types); |
9a310d21 | 309 | |
143070e7 | 310 | kfree(mtd_list); |
a2c2fe4b | 311 | |
a2c2fe4b VW |
312 | return 0; |
313 | ||
314 | err_out: | |
143070e7 | 315 | kfree(mtd_list); |
ad4fbc79 | 316 | err_flash_remove: |
c4d5e375 | 317 | of_flash_remove(dev); |
143070e7 | 318 | |
a2c2fe4b | 319 | return err; |
a2c2fe4b VW |
320 | } |
321 | ||
c4d5e375 | 322 | static struct of_device_id of_flash_match[] = { |
2099172d DG |
323 | { |
324 | .compatible = "cfi-flash", | |
325 | .data = (void *)"cfi_probe", | |
326 | }, | |
327 | { | |
328 | /* FIXME: JEDEC chips can't be safely and reliably | |
329 | * probed, although the mtd code gets it right in | |
330 | * practice most of the time. We should use the | |
331 | * vendor and device ids specified by the binding to | |
332 | * bypass the heuristic probe code, but the mtd layer | |
333 | * provides, at present, no interface for doing so | |
334 | * :(. */ | |
335 | .compatible = "jedec-flash", | |
336 | .data = (void *)"jedec_probe", | |
337 | }, | |
fc28c39f WS |
338 | { |
339 | .compatible = "mtd-ram", | |
340 | .data = (void *)"map_ram", | |
341 | }, | |
a2c2fe4b VW |
342 | { |
343 | .type = "rom", | |
344 | .compatible = "direct-mapped" | |
345 | }, | |
346 | { }, | |
347 | }; | |
c4d5e375 | 348 | MODULE_DEVICE_TABLE(of, of_flash_match); |
a2c2fe4b | 349 | |
1c48a5c9 | 350 | static struct platform_driver of_flash_driver = { |
4018294b GL |
351 | .driver = { |
352 | .name = "of-flash", | |
353 | .owner = THIS_MODULE, | |
354 | .of_match_table = of_flash_match, | |
355 | }, | |
c4d5e375 DG |
356 | .probe = of_flash_probe, |
357 | .remove = of_flash_remove, | |
a2c2fe4b VW |
358 | }; |
359 | ||
f99640de | 360 | module_platform_driver(of_flash_driver); |
a2c2fe4b VW |
361 | |
362 | MODULE_LICENSE("GPL"); | |
363 | MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>"); | |
c4d5e375 | 364 | MODULE_DESCRIPTION("Device tree based MTD map driver"); |