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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 | * | |
a921e28b | 9 | * $Id: plat-ram.c,v 1.3 2005/03/19 22:41:27 gleixner 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> | |
4e57b681 | 33 | #include <linux/slab.h> |
99f2a8ae BD |
34 | |
35 | #include <linux/mtd/mtd.h> | |
36 | #include <linux/mtd/map.h> | |
37 | #include <linux/mtd/partitions.h> | |
38 | #include <linux/mtd/plat-ram.h> | |
39 | ||
40 | #include <asm/io.h> | |
41 | ||
42 | /* private structure for each mtd platform ram device created */ | |
43 | ||
44 | struct platram_info { | |
45 | struct device *dev; | |
46 | struct mtd_info *mtd; | |
47 | struct map_info map; | |
48 | struct mtd_partition *partitions; | |
49 | struct resource *area; | |
50 | struct platdata_mtd_ram *pdata; | |
51 | }; | |
52 | ||
53 | /* to_platram_info() | |
54 | * | |
55 | * device private data to struct platram_info conversion | |
56 | */ | |
57 | ||
58 | static inline struct platram_info *to_platram_info(struct device *dev) | |
59 | { | |
60 | return (struct platram_info *)dev_get_drvdata(dev); | |
61 | } | |
62 | ||
63 | /* platram_setrw | |
64 | * | |
65 | * call the platform device's set rw/ro control | |
66 | * | |
67 | * to = 0 => read-only | |
68 | * = 1 => read-write | |
69 | */ | |
70 | ||
71 | static inline void platram_setrw(struct platram_info *info, int to) | |
72 | { | |
73 | if (info->pdata == NULL) | |
74 | return; | |
75 | ||
76 | if (info->pdata->set_rw != NULL) | |
77 | (info->pdata->set_rw)(info->dev, to); | |
78 | } | |
79 | ||
80 | /* platram_remove | |
81 | * | |
82 | * called to remove the device from the driver's control | |
83 | */ | |
84 | ||
85 | static int platram_remove(struct device *dev) | |
86 | { | |
87 | struct platram_info *info = to_platram_info(dev); | |
88 | ||
89 | dev_set_drvdata(dev, NULL); | |
90 | ||
91 | dev_dbg(dev, "removing device\n"); | |
92 | ||
93 | if (info == NULL) | |
94 | return 0; | |
95 | ||
96 | if (info->mtd) { | |
97 | #ifdef CONFIG_MTD_PARTITIONS | |
98 | if (info->partitions) { | |
99 | del_mtd_partitions(info->mtd); | |
100 | kfree(info->partitions); | |
101 | } | |
102 | #endif | |
103 | del_mtd_device(info->mtd); | |
104 | map_destroy(info->mtd); | |
105 | } | |
106 | ||
107 | /* ensure ram is left read-only */ | |
108 | ||
109 | platram_setrw(info, PLATRAM_RO); | |
110 | ||
111 | /* release resources */ | |
112 | ||
113 | if (info->area) { | |
114 | release_resource(info->area); | |
115 | kfree(info->area); | |
116 | } | |
117 | ||
118 | if (info->map.virt != NULL) | |
119 | iounmap(info->map.virt); | |
120 | ||
121 | kfree(info); | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | /* platram_probe | |
127 | * | |
128 | * called from device drive system when a device matching our | |
129 | * driver is found. | |
130 | */ | |
131 | ||
132 | static int platram_probe(struct device *dev) | |
133 | { | |
134 | struct platform_device *pd = to_platform_device(dev); | |
135 | struct platdata_mtd_ram *pdata; | |
136 | struct platram_info *info; | |
137 | struct resource *res; | |
138 | int err = 0; | |
139 | ||
140 | dev_dbg(dev, "probe entered\n"); | |
141 | ||
142 | if (dev->platform_data == NULL) { | |
143 | dev_err(dev, "no platform data supplied\n"); | |
144 | err = -ENOENT; | |
145 | goto exit_error; | |
146 | } | |
147 | ||
148 | pdata = dev->platform_data; | |
149 | ||
150 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
151 | if (info == NULL) { | |
152 | dev_err(dev, "no memory for flash info\n"); | |
153 | err = -ENOMEM; | |
154 | goto exit_error; | |
155 | } | |
156 | ||
a921e28b | 157 | memset(info, 0, sizeof(*info)); |
99f2a8ae BD |
158 | dev_set_drvdata(dev, info); |
159 | ||
160 | info->dev = dev; | |
161 | info->pdata = pdata; | |
162 | ||
163 | /* get the resource for the memory mapping */ | |
164 | ||
165 | res = platform_get_resource(pd, IORESOURCE_MEM, 0); | |
166 | ||
167 | if (res == NULL) { | |
168 | dev_err(dev, "no memory resource specified\n"); | |
169 | err = -ENOENT; | |
170 | goto exit_free; | |
171 | } | |
172 | ||
173 | dev_dbg(dev, "got platform resource %p (0x%lx)\n", res, res->start); | |
174 | ||
175 | /* setup map parameters */ | |
176 | ||
177 | info->map.phys = res->start; | |
178 | info->map.size = (res->end - res->start) + 1; | |
179 | info->map.name = pdata->mapname != NULL ? pdata->mapname : pd->name; | |
180 | info->map.bankwidth = pdata->bankwidth; | |
181 | ||
182 | /* register our usage of the memory area */ | |
183 | ||
184 | info->area = request_mem_region(res->start, info->map.size, pd->name); | |
185 | if (info->area == NULL) { | |
186 | dev_err(dev, "failed to request memory region\n"); | |
187 | err = -EIO; | |
188 | goto exit_free; | |
189 | } | |
190 | ||
191 | /* remap the memory area */ | |
192 | ||
193 | info->map.virt = ioremap(res->start, info->map.size); | |
fb6bb52d | 194 | dev_dbg(dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size); |
99f2a8ae BD |
195 | |
196 | if (info->map.virt == NULL) { | |
197 | dev_err(dev, "failed to ioremap() region\n"); | |
198 | err = -EIO; | |
199 | goto exit_free; | |
200 | } | |
201 | ||
99f2a8ae BD |
202 | simple_map_init(&info->map); |
203 | ||
204 | dev_dbg(dev, "initialised map, probing for mtd\n"); | |
205 | ||
206 | /* probe for the right mtd map driver */ | |
207 | ||
208 | info->mtd = do_map_probe("map_ram" , &info->map); | |
209 | if (info->mtd == NULL) { | |
210 | dev_err(dev, "failed to probe for map_ram\n"); | |
211 | err = -ENOMEM; | |
212 | goto exit_free; | |
213 | } | |
214 | ||
215 | info->mtd->owner = THIS_MODULE; | |
216 | ||
217 | platram_setrw(info, PLATRAM_RW); | |
218 | ||
219 | /* check to see if there are any available partitions, or wether | |
220 | * to add this device whole */ | |
221 | ||
222 | #ifdef CONFIG_MTD_PARTITIONS | |
223 | if (pdata->nr_partitions > 0) { | |
224 | const char **probes = { NULL }; | |
225 | ||
226 | if (pdata->probes) | |
227 | probes = (const char **)pdata->probes; | |
228 | ||
229 | err = parse_mtd_partitions(info->mtd, probes, | |
230 | &info->partitions, 0); | |
231 | if (err > 0) { | |
232 | err = add_mtd_partitions(info->mtd, info->partitions, | |
233 | err); | |
234 | } | |
235 | } | |
236 | #endif /* CONFIG_MTD_PARTITIONS */ | |
237 | ||
238 | if (add_mtd_device(info->mtd)) { | |
239 | dev_err(dev, "add_mtd_device() failed\n"); | |
240 | err = -ENOMEM; | |
241 | } | |
242 | ||
243 | dev_info(dev, "registered mtd device\n"); | |
244 | return err; | |
245 | ||
246 | exit_free: | |
247 | platram_remove(dev); | |
248 | exit_error: | |
249 | return err; | |
250 | } | |
251 | ||
252 | /* device driver info */ | |
253 | ||
254 | static struct device_driver platram_driver = { | |
255 | .name = "mtd-ram", | |
256 | .bus = &platform_bus_type, | |
257 | .probe = platram_probe, | |
258 | .remove = platram_remove, | |
259 | }; | |
260 | ||
261 | /* module init/exit */ | |
262 | ||
263 | static int __init platram_init(void) | |
264 | { | |
265 | printk("Generic platform RAM MTD, (c) 2004 Simtec Electronics\n"); | |
266 | return driver_register(&platram_driver); | |
267 | } | |
268 | ||
269 | static void __exit platram_exit(void) | |
270 | { | |
271 | driver_unregister(&platram_driver); | |
272 | } | |
273 | ||
274 | module_init(platram_init); | |
275 | module_exit(platram_exit); | |
276 | ||
277 | MODULE_LICENSE("GPL"); | |
278 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
279 | MODULE_DESCRIPTION("MTD platform RAM map driver"); |