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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 | * | |
7 | * Generic platfrom device based RAM map | |
8 | * | |
fb6bb52d | 9 | * $Id: plat-ram.c,v 1.2 2005/03/14 20:33:19 bjd Exp $ |
99f2a8ae BD |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | */ | |
25 | ||
99f2a8ae BD |
26 | #include <linux/module.h> |
27 | #include <linux/types.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/string.h> | |
31 | #include <linux/ioport.h> | |
32 | #include <linux/device.h> | |
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; | |
47 | struct mtd_partition *partitions; | |
48 | struct resource *area; | |
49 | struct platdata_mtd_ram *pdata; | |
50 | }; | |
51 | ||
52 | /* to_platram_info() | |
53 | * | |
54 | * device private data to struct platram_info conversion | |
55 | */ | |
56 | ||
57 | static inline struct platram_info *to_platram_info(struct device *dev) | |
58 | { | |
59 | return (struct platram_info *)dev_get_drvdata(dev); | |
60 | } | |
61 | ||
62 | /* platram_setrw | |
63 | * | |
64 | * call the platform device's set rw/ro control | |
65 | * | |
66 | * to = 0 => read-only | |
67 | * = 1 => read-write | |
68 | */ | |
69 | ||
70 | static inline void platram_setrw(struct platram_info *info, int to) | |
71 | { | |
72 | if (info->pdata == NULL) | |
73 | return; | |
74 | ||
75 | if (info->pdata->set_rw != NULL) | |
76 | (info->pdata->set_rw)(info->dev, to); | |
77 | } | |
78 | ||
79 | /* platram_remove | |
80 | * | |
81 | * called to remove the device from the driver's control | |
82 | */ | |
83 | ||
84 | static int platram_remove(struct device *dev) | |
85 | { | |
86 | struct platram_info *info = to_platram_info(dev); | |
87 | ||
88 | dev_set_drvdata(dev, NULL); | |
89 | ||
90 | dev_dbg(dev, "removing device\n"); | |
91 | ||
92 | if (info == NULL) | |
93 | return 0; | |
94 | ||
95 | if (info->mtd) { | |
96 | #ifdef CONFIG_MTD_PARTITIONS | |
97 | if (info->partitions) { | |
98 | del_mtd_partitions(info->mtd); | |
99 | kfree(info->partitions); | |
100 | } | |
101 | #endif | |
102 | del_mtd_device(info->mtd); | |
103 | map_destroy(info->mtd); | |
104 | } | |
105 | ||
106 | /* ensure ram is left read-only */ | |
107 | ||
108 | platram_setrw(info, PLATRAM_RO); | |
109 | ||
110 | /* release resources */ | |
111 | ||
112 | if (info->area) { | |
113 | release_resource(info->area); | |
114 | kfree(info->area); | |
115 | } | |
116 | ||
117 | if (info->map.virt != NULL) | |
118 | iounmap(info->map.virt); | |
119 | ||
120 | kfree(info); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | /* platram_probe | |
126 | * | |
127 | * called from device drive system when a device matching our | |
128 | * driver is found. | |
129 | */ | |
130 | ||
131 | static int platram_probe(struct device *dev) | |
132 | { | |
133 | struct platform_device *pd = to_platform_device(dev); | |
134 | struct platdata_mtd_ram *pdata; | |
135 | struct platram_info *info; | |
136 | struct resource *res; | |
137 | int err = 0; | |
138 | ||
139 | dev_dbg(dev, "probe entered\n"); | |
140 | ||
141 | if (dev->platform_data == NULL) { | |
142 | dev_err(dev, "no platform data supplied\n"); | |
143 | err = -ENOENT; | |
144 | goto exit_error; | |
145 | } | |
146 | ||
147 | pdata = dev->platform_data; | |
148 | ||
149 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
150 | if (info == NULL) { | |
151 | dev_err(dev, "no memory for flash info\n"); | |
152 | err = -ENOMEM; | |
153 | goto exit_error; | |
154 | } | |
155 | ||
156 | memzero(info, sizeof(*info)); | |
157 | dev_set_drvdata(dev, info); | |
158 | ||
159 | info->dev = dev; | |
160 | info->pdata = pdata; | |
161 | ||
162 | /* get the resource for the memory mapping */ | |
163 | ||
164 | res = platform_get_resource(pd, IORESOURCE_MEM, 0); | |
165 | ||
166 | if (res == NULL) { | |
167 | dev_err(dev, "no memory resource specified\n"); | |
168 | err = -ENOENT; | |
169 | goto exit_free; | |
170 | } | |
171 | ||
172 | dev_dbg(dev, "got platform resource %p (0x%lx)\n", res, res->start); | |
173 | ||
174 | /* setup map parameters */ | |
175 | ||
176 | info->map.phys = res->start; | |
177 | info->map.size = (res->end - res->start) + 1; | |
178 | info->map.name = pdata->mapname != NULL ? pdata->mapname : pd->name; | |
179 | info->map.bankwidth = pdata->bankwidth; | |
180 | ||
181 | /* register our usage of the memory area */ | |
182 | ||
183 | info->area = request_mem_region(res->start, info->map.size, pd->name); | |
184 | if (info->area == NULL) { | |
185 | dev_err(dev, "failed to request memory region\n"); | |
186 | err = -EIO; | |
187 | goto exit_free; | |
188 | } | |
189 | ||
190 | /* remap the memory area */ | |
191 | ||
192 | info->map.virt = ioremap(res->start, info->map.size); | |
fb6bb52d | 193 | dev_dbg(dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size); |
99f2a8ae BD |
194 | |
195 | if (info->map.virt == NULL) { | |
196 | dev_err(dev, "failed to ioremap() region\n"); | |
197 | err = -EIO; | |
198 | goto exit_free; | |
199 | } | |
200 | ||
99f2a8ae BD |
201 | simple_map_init(&info->map); |
202 | ||
203 | dev_dbg(dev, "initialised map, probing for mtd\n"); | |
204 | ||
205 | /* probe for the right mtd map driver */ | |
206 | ||
207 | info->mtd = do_map_probe("map_ram" , &info->map); | |
208 | if (info->mtd == NULL) { | |
209 | dev_err(dev, "failed to probe for map_ram\n"); | |
210 | err = -ENOMEM; | |
211 | goto exit_free; | |
212 | } | |
213 | ||
214 | info->mtd->owner = THIS_MODULE; | |
215 | ||
216 | platram_setrw(info, PLATRAM_RW); | |
217 | ||
218 | /* check to see if there are any available partitions, or wether | |
219 | * to add this device whole */ | |
220 | ||
221 | #ifdef CONFIG_MTD_PARTITIONS | |
222 | if (pdata->nr_partitions > 0) { | |
223 | const char **probes = { NULL }; | |
224 | ||
225 | if (pdata->probes) | |
226 | probes = (const char **)pdata->probes; | |
227 | ||
228 | err = parse_mtd_partitions(info->mtd, probes, | |
229 | &info->partitions, 0); | |
230 | if (err > 0) { | |
231 | err = add_mtd_partitions(info->mtd, info->partitions, | |
232 | err); | |
233 | } | |
234 | } | |
235 | #endif /* CONFIG_MTD_PARTITIONS */ | |
236 | ||
237 | if (add_mtd_device(info->mtd)) { | |
238 | dev_err(dev, "add_mtd_device() failed\n"); | |
239 | err = -ENOMEM; | |
240 | } | |
241 | ||
242 | dev_info(dev, "registered mtd device\n"); | |
243 | return err; | |
244 | ||
245 | exit_free: | |
246 | platram_remove(dev); | |
247 | exit_error: | |
248 | return err; | |
249 | } | |
250 | ||
251 | /* device driver info */ | |
252 | ||
253 | static struct device_driver platram_driver = { | |
254 | .name = "mtd-ram", | |
255 | .bus = &platform_bus_type, | |
256 | .probe = platram_probe, | |
257 | .remove = platram_remove, | |
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"); | |
265 | return driver_register(&platram_driver); | |
266 | } | |
267 | ||
268 | static void __exit platram_exit(void) | |
269 | { | |
270 | driver_unregister(&platram_driver); | |
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"); |