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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 | * | |
9 | * $Id: plat-ram.c,v 1.1 2005/01/24 00:37:02 bjd Exp $ | |
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 | ||
26 | #define DEBUG | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/ioport.h> | |
34 | #include <linux/device.h> | |
35 | ||
36 | #include <linux/mtd/mtd.h> | |
37 | #include <linux/mtd/map.h> | |
38 | #include <linux/mtd/partitions.h> | |
39 | #include <linux/mtd/plat-ram.h> | |
40 | ||
41 | #include <asm/io.h> | |
42 | ||
43 | /* private structure for each mtd platform ram device created */ | |
44 | ||
45 | struct platram_info { | |
46 | struct device *dev; | |
47 | struct mtd_info *mtd; | |
48 | struct map_info map; | |
49 | struct mtd_partition *partitions; | |
50 | struct resource *area; | |
51 | struct platdata_mtd_ram *pdata; | |
52 | }; | |
53 | ||
54 | /* to_platram_info() | |
55 | * | |
56 | * device private data to struct platram_info conversion | |
57 | */ | |
58 | ||
59 | static inline struct platram_info *to_platram_info(struct device *dev) | |
60 | { | |
61 | return (struct platram_info *)dev_get_drvdata(dev); | |
62 | } | |
63 | ||
64 | /* platram_setrw | |
65 | * | |
66 | * call the platform device's set rw/ro control | |
67 | * | |
68 | * to = 0 => read-only | |
69 | * = 1 => read-write | |
70 | */ | |
71 | ||
72 | static inline void platram_setrw(struct platram_info *info, int to) | |
73 | { | |
74 | if (info->pdata == NULL) | |
75 | return; | |
76 | ||
77 | if (info->pdata->set_rw != NULL) | |
78 | (info->pdata->set_rw)(info->dev, to); | |
79 | } | |
80 | ||
81 | /* platram_remove | |
82 | * | |
83 | * called to remove the device from the driver's control | |
84 | */ | |
85 | ||
86 | static int platram_remove(struct device *dev) | |
87 | { | |
88 | struct platram_info *info = to_platram_info(dev); | |
89 | ||
90 | dev_set_drvdata(dev, NULL); | |
91 | ||
92 | dev_dbg(dev, "removing device\n"); | |
93 | ||
94 | if (info == NULL) | |
95 | return 0; | |
96 | ||
97 | if (info->mtd) { | |
98 | #ifdef CONFIG_MTD_PARTITIONS | |
99 | if (info->partitions) { | |
100 | del_mtd_partitions(info->mtd); | |
101 | kfree(info->partitions); | |
102 | } | |
103 | #endif | |
104 | del_mtd_device(info->mtd); | |
105 | map_destroy(info->mtd); | |
106 | } | |
107 | ||
108 | /* ensure ram is left read-only */ | |
109 | ||
110 | platram_setrw(info, PLATRAM_RO); | |
111 | ||
112 | /* release resources */ | |
113 | ||
114 | if (info->area) { | |
115 | release_resource(info->area); | |
116 | kfree(info->area); | |
117 | } | |
118 | ||
119 | if (info->map.virt != NULL) | |
120 | iounmap(info->map.virt); | |
121 | ||
122 | kfree(info); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | /* platram_probe | |
128 | * | |
129 | * called from device drive system when a device matching our | |
130 | * driver is found. | |
131 | */ | |
132 | ||
133 | static int platram_probe(struct device *dev) | |
134 | { | |
135 | struct platform_device *pd = to_platform_device(dev); | |
136 | struct platdata_mtd_ram *pdata; | |
137 | struct platram_info *info; | |
138 | struct resource *res; | |
139 | int err = 0; | |
140 | ||
141 | dev_dbg(dev, "probe entered\n"); | |
142 | ||
143 | if (dev->platform_data == NULL) { | |
144 | dev_err(dev, "no platform data supplied\n"); | |
145 | err = -ENOENT; | |
146 | goto exit_error; | |
147 | } | |
148 | ||
149 | pdata = dev->platform_data; | |
150 | ||
151 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
152 | if (info == NULL) { | |
153 | dev_err(dev, "no memory for flash info\n"); | |
154 | err = -ENOMEM; | |
155 | goto exit_error; | |
156 | } | |
157 | ||
158 | memzero(info, sizeof(*info)); | |
159 | dev_set_drvdata(dev, info); | |
160 | ||
161 | info->dev = dev; | |
162 | info->pdata = pdata; | |
163 | ||
164 | /* get the resource for the memory mapping */ | |
165 | ||
166 | res = platform_get_resource(pd, IORESOURCE_MEM, 0); | |
167 | ||
168 | if (res == NULL) { | |
169 | dev_err(dev, "no memory resource specified\n"); | |
170 | err = -ENOENT; | |
171 | goto exit_free; | |
172 | } | |
173 | ||
174 | dev_dbg(dev, "got platform resource %p (0x%lx)\n", res, res->start); | |
175 | ||
176 | /* setup map parameters */ | |
177 | ||
178 | info->map.phys = res->start; | |
179 | info->map.size = (res->end - res->start) + 1; | |
180 | info->map.name = pdata->mapname != NULL ? pdata->mapname : pd->name; | |
181 | info->map.bankwidth = pdata->bankwidth; | |
182 | ||
183 | /* register our usage of the memory area */ | |
184 | ||
185 | info->area = request_mem_region(res->start, info->map.size, pd->name); | |
186 | if (info->area == NULL) { | |
187 | dev_err(dev, "failed to request memory region\n"); | |
188 | err = -EIO; | |
189 | goto exit_free; | |
190 | } | |
191 | ||
192 | /* remap the memory area */ | |
193 | ||
194 | info->map.virt = ioremap(res->start, info->map.size); | |
195 | dev_dbg(dev, "virt %p, %d bytes\n", info->map.virt, info->map.size); | |
196 | ||
197 | if (info->map.virt == NULL) { | |
198 | dev_err(dev, "failed to ioremap() region\n"); | |
199 | err = -EIO; | |
200 | goto exit_free; | |
201 | } | |
202 | ||
203 | { | |
204 | unsigned int *p = (unsigned int *)info->map.virt; | |
205 | printk("%08x %08x %08x %08x\n", | |
206 | readl(p), readl(p+1), readl(p+2), readl(p+3)); | |
207 | } | |
208 | ||
209 | simple_map_init(&info->map); | |
210 | ||
211 | dev_dbg(dev, "initialised map, probing for mtd\n"); | |
212 | ||
213 | /* probe for the right mtd map driver */ | |
214 | ||
215 | info->mtd = do_map_probe("map_ram" , &info->map); | |
216 | if (info->mtd == NULL) { | |
217 | dev_err(dev, "failed to probe for map_ram\n"); | |
218 | err = -ENOMEM; | |
219 | goto exit_free; | |
220 | } | |
221 | ||
222 | info->mtd->owner = THIS_MODULE; | |
223 | ||
224 | platram_setrw(info, PLATRAM_RW); | |
225 | ||
226 | /* check to see if there are any available partitions, or wether | |
227 | * to add this device whole */ | |
228 | ||
229 | #ifdef CONFIG_MTD_PARTITIONS | |
230 | if (pdata->nr_partitions > 0) { | |
231 | const char **probes = { NULL }; | |
232 | ||
233 | if (pdata->probes) | |
234 | probes = (const char **)pdata->probes; | |
235 | ||
236 | err = parse_mtd_partitions(info->mtd, probes, | |
237 | &info->partitions, 0); | |
238 | if (err > 0) { | |
239 | err = add_mtd_partitions(info->mtd, info->partitions, | |
240 | err); | |
241 | } | |
242 | } | |
243 | #endif /* CONFIG_MTD_PARTITIONS */ | |
244 | ||
245 | if (add_mtd_device(info->mtd)) { | |
246 | dev_err(dev, "add_mtd_device() failed\n"); | |
247 | err = -ENOMEM; | |
248 | } | |
249 | ||
250 | dev_info(dev, "registered mtd device\n"); | |
251 | return err; | |
252 | ||
253 | exit_free: | |
254 | platram_remove(dev); | |
255 | exit_error: | |
256 | return err; | |
257 | } | |
258 | ||
259 | /* device driver info */ | |
260 | ||
261 | static struct device_driver platram_driver = { | |
262 | .name = "mtd-ram", | |
263 | .bus = &platform_bus_type, | |
264 | .probe = platram_probe, | |
265 | .remove = platram_remove, | |
266 | }; | |
267 | ||
268 | /* module init/exit */ | |
269 | ||
270 | static int __init platram_init(void) | |
271 | { | |
272 | printk("Generic platform RAM MTD, (c) 2004 Simtec Electronics\n"); | |
273 | return driver_register(&platram_driver); | |
274 | } | |
275 | ||
276 | static void __exit platram_exit(void) | |
277 | { | |
278 | driver_unregister(&platram_driver); | |
279 | } | |
280 | ||
281 | module_init(platram_init); | |
282 | module_exit(platram_exit); | |
283 | ||
284 | MODULE_LICENSE("GPL"); | |
285 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
286 | MODULE_DESCRIPTION("MTD platform RAM map driver"); |