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99f2a8ae BD |
1 | /* drivers/mtd/maps/plat-ram.c |
2 | * | |
3 | * (c) 2004-2005 Simtec Electronics | |
4 | * http://www.simtec.co.uk/products/SWLINUX/ | |
5 | * Ben Dooks <ben@simtec.co.uk> | |
6 | * | |
947af294 | 7 | * Generic platform device based RAM map |
99f2a8ae | 8 | * |
99f2a8ae BD |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | ||
99f2a8ae BD |
24 | #include <linux/module.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/ioport.h> | |
30 | #include <linux/device.h> | |
4e57b681 | 31 | #include <linux/slab.h> |
d052d1be | 32 | #include <linux/platform_device.h> |
99f2a8ae BD |
33 | |
34 | #include <linux/mtd/mtd.h> | |
35 | #include <linux/mtd/map.h> | |
36 | #include <linux/mtd/partitions.h> | |
37 | #include <linux/mtd/plat-ram.h> | |
38 | ||
39 | #include <asm/io.h> | |
40 | ||
41 | /* private structure for each mtd platform ram device created */ | |
42 | ||
43 | struct platram_info { | |
44 | struct device *dev; | |
45 | struct mtd_info *mtd; | |
46 | struct map_info map; | |
99f2a8ae BD |
47 | struct resource *area; |
48 | struct platdata_mtd_ram *pdata; | |
49 | }; | |
50 | ||
51 | /* to_platram_info() | |
52 | * | |
53 | * device private data to struct platram_info conversion | |
54 | */ | |
55 | ||
3ae5eaec | 56 | static inline struct platram_info *to_platram_info(struct platform_device *dev) |
99f2a8ae | 57 | { |
3ae5eaec | 58 | return (struct platram_info *)platform_get_drvdata(dev); |
99f2a8ae BD |
59 | } |
60 | ||
61 | /* platram_setrw | |
62 | * | |
63 | * call the platform device's set rw/ro control | |
64 | * | |
65 | * to = 0 => read-only | |
66 | * = 1 => read-write | |
67 | */ | |
68 | ||
69 | static inline void platram_setrw(struct platram_info *info, int to) | |
70 | { | |
71 | if (info->pdata == NULL) | |
72 | return; | |
73 | ||
74 | if (info->pdata->set_rw != NULL) | |
75 | (info->pdata->set_rw)(info->dev, to); | |
76 | } | |
77 | ||
78 | /* platram_remove | |
79 | * | |
80 | * called to remove the device from the driver's control | |
81 | */ | |
82 | ||
3ae5eaec | 83 | static int platram_remove(struct platform_device *pdev) |
99f2a8ae | 84 | { |
3ae5eaec | 85 | struct platram_info *info = to_platram_info(pdev); |
99f2a8ae | 86 | |
3ae5eaec | 87 | dev_dbg(&pdev->dev, "removing device\n"); |
99f2a8ae | 88 | |
69f34c98 | 89 | if (info == NULL) |
99f2a8ae BD |
90 | return 0; |
91 | ||
92 | if (info->mtd) { | |
095dd500 | 93 | mtd_device_unregister(info->mtd); |
99f2a8ae BD |
94 | map_destroy(info->mtd); |
95 | } | |
96 | ||
97 | /* ensure ram is left read-only */ | |
98 | ||
99 | platram_setrw(info, PLATRAM_RO); | |
100 | ||
101 | /* release resources */ | |
102 | ||
103 | if (info->area) { | |
104 | release_resource(info->area); | |
105 | kfree(info->area); | |
106 | } | |
107 | ||
108 | if (info->map.virt != NULL) | |
109 | iounmap(info->map.virt); | |
69f34c98 | 110 | |
99f2a8ae BD |
111 | kfree(info); |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | /* platram_probe | |
117 | * | |
118 | * called from device drive system when a device matching our | |
119 | * driver is found. | |
120 | */ | |
121 | ||
3ae5eaec | 122 | static int platram_probe(struct platform_device *pdev) |
99f2a8ae | 123 | { |
99f2a8ae BD |
124 | struct platdata_mtd_ram *pdata; |
125 | struct platram_info *info; | |
126 | struct resource *res; | |
127 | int err = 0; | |
128 | ||
3ae5eaec | 129 | dev_dbg(&pdev->dev, "probe entered\n"); |
69f34c98 | 130 | |
d20d5a57 | 131 | if (dev_get_platdata(&pdev->dev) == NULL) { |
3ae5eaec | 132 | dev_err(&pdev->dev, "no platform data supplied\n"); |
99f2a8ae BD |
133 | err = -ENOENT; |
134 | goto exit_error; | |
135 | } | |
136 | ||
d20d5a57 | 137 | pdata = dev_get_platdata(&pdev->dev); |
99f2a8ae | 138 | |
95b93a0c | 139 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
99f2a8ae | 140 | if (info == NULL) { |
3ae5eaec | 141 | dev_err(&pdev->dev, "no memory for flash info\n"); |
99f2a8ae BD |
142 | err = -ENOMEM; |
143 | goto exit_error; | |
144 | } | |
145 | ||
3ae5eaec | 146 | platform_set_drvdata(pdev, info); |
99f2a8ae | 147 | |
3ae5eaec | 148 | info->dev = &pdev->dev; |
99f2a8ae BD |
149 | info->pdata = pdata; |
150 | ||
151 | /* get the resource for the memory mapping */ | |
152 | ||
3ae5eaec | 153 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
99f2a8ae BD |
154 | |
155 | if (res == NULL) { | |
3ae5eaec | 156 | dev_err(&pdev->dev, "no memory resource specified\n"); |
99f2a8ae BD |
157 | err = -ENOENT; |
158 | goto exit_free; | |
159 | } | |
160 | ||
06d63cc5 RD |
161 | dev_dbg(&pdev->dev, "got platform resource %p (0x%llx)\n", res, |
162 | (unsigned long long)res->start); | |
99f2a8ae BD |
163 | |
164 | /* setup map parameters */ | |
165 | ||
166 | info->map.phys = res->start; | |
76d6a479 | 167 | info->map.size = resource_size(res); |
75757006 FF |
168 | info->map.name = pdata->mapname != NULL ? |
169 | (char *)pdata->mapname : (char *)pdev->name; | |
99f2a8ae BD |
170 | info->map.bankwidth = pdata->bankwidth; |
171 | ||
172 | /* register our usage of the memory area */ | |
173 | ||
3ae5eaec | 174 | info->area = request_mem_region(res->start, info->map.size, pdev->name); |
99f2a8ae | 175 | if (info->area == NULL) { |
3ae5eaec | 176 | dev_err(&pdev->dev, "failed to request memory region\n"); |
99f2a8ae BD |
177 | err = -EIO; |
178 | goto exit_free; | |
179 | } | |
180 | ||
181 | /* remap the memory area */ | |
182 | ||
183 | info->map.virt = ioremap(res->start, info->map.size); | |
3ae5eaec | 184 | dev_dbg(&pdev->dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size); |
99f2a8ae BD |
185 | |
186 | if (info->map.virt == NULL) { | |
3ae5eaec | 187 | dev_err(&pdev->dev, "failed to ioremap() region\n"); |
99f2a8ae BD |
188 | err = -EIO; |
189 | goto exit_free; | |
190 | } | |
191 | ||
99f2a8ae BD |
192 | simple_map_init(&info->map); |
193 | ||
3ae5eaec | 194 | dev_dbg(&pdev->dev, "initialised map, probing for mtd\n"); |
99f2a8ae | 195 | |
75757006 FF |
196 | /* probe for the right mtd map driver |
197 | * supplied by the platform_data struct */ | |
198 | ||
a01e035e | 199 | if (pdata->map_probes) { |
d50dcb1d | 200 | const char * const *map_probes = pdata->map_probes; |
75757006 FF |
201 | |
202 | for ( ; !info->mtd && *map_probes; map_probes++) | |
203 | info->mtd = do_map_probe(*map_probes , &info->map); | |
204 | } | |
205 | /* fallback to map_ram */ | |
206 | else | |
207 | info->mtd = do_map_probe("map_ram", &info->map); | |
99f2a8ae | 208 | |
99f2a8ae | 209 | if (info->mtd == NULL) { |
3ae5eaec | 210 | dev_err(&pdev->dev, "failed to probe for map_ram\n"); |
99f2a8ae BD |
211 | err = -ENOMEM; |
212 | goto exit_free; | |
213 | } | |
214 | ||
215 | info->mtd->owner = THIS_MODULE; | |
87f39f04 | 216 | info->mtd->dev.parent = &pdev->dev; |
99f2a8ae BD |
217 | |
218 | platram_setrw(info, PLATRAM_RW); | |
219 | ||
48fc7f7e | 220 | /* check to see if there are any available partitions, or whether |
99f2a8ae BD |
221 | * to add this device whole */ |
222 | ||
42d7fbe2 AB |
223 | err = mtd_device_parse_register(info->mtd, pdata->probes, NULL, |
224 | pdata->partitions, | |
225 | pdata->nr_partitions); | |
75757006 FF |
226 | if (!err) |
227 | dev_info(&pdev->dev, "registered mtd device\n"); | |
228 | ||
c3298791 IY |
229 | if (pdata->nr_partitions) { |
230 | /* add the whole device. */ | |
231 | err = mtd_device_register(info->mtd, NULL, 0); | |
232 | if (err) { | |
233 | dev_err(&pdev->dev, | |
234 | "failed to register the entire device\n"); | |
235 | } | |
236 | } | |
095dd500 | 237 | |
99f2a8ae BD |
238 | return err; |
239 | ||
240 | exit_free: | |
3ae5eaec | 241 | platram_remove(pdev); |
99f2a8ae BD |
242 | exit_error: |
243 | return err; | |
244 | } | |
245 | ||
246 | /* device driver info */ | |
247 | ||
41d867c9 KS |
248 | /* work with hotplug and coldplug */ |
249 | MODULE_ALIAS("platform:mtd-ram"); | |
250 | ||
3ae5eaec | 251 | static struct platform_driver platram_driver = { |
99f2a8ae BD |
252 | .probe = platram_probe, |
253 | .remove = platram_remove, | |
3ae5eaec RK |
254 | .driver = { |
255 | .name = "mtd-ram", | |
256 | .owner = THIS_MODULE, | |
257 | }, | |
99f2a8ae BD |
258 | }; |
259 | ||
260 | /* module init/exit */ | |
261 | ||
262 | static int __init platram_init(void) | |
263 | { | |
264 | printk("Generic platform RAM MTD, (c) 2004 Simtec Electronics\n"); | |
3ae5eaec | 265 | return platform_driver_register(&platram_driver); |
99f2a8ae BD |
266 | } |
267 | ||
268 | static void __exit platram_exit(void) | |
269 | { | |
3ae5eaec | 270 | platform_driver_unregister(&platram_driver); |
99f2a8ae BD |
271 | } |
272 | ||
273 | module_init(platram_init); | |
274 | module_exit(platram_exit); | |
275 | ||
276 | MODULE_LICENSE("GPL"); | |
277 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
278 | MODULE_DESCRIPTION("MTD platform RAM map driver"); |