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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 | * | |
7 | * Generic platfrom device based RAM map | |
8 | * | |
69f34c98 | 9 | * $Id: plat-ram.c,v 1.7 2005/11/07 11:14:28 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> |
d052d1be | 34 | #include <linux/platform_device.h> |
99f2a8ae BD |
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 | ||
3ae5eaec | 59 | static inline struct platram_info *to_platram_info(struct platform_device *dev) |
99f2a8ae | 60 | { |
3ae5eaec | 61 | return (struct platram_info *)platform_get_drvdata(dev); |
99f2a8ae BD |
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 | ||
3ae5eaec | 86 | static int platram_remove(struct platform_device *pdev) |
99f2a8ae | 87 | { |
3ae5eaec | 88 | struct platram_info *info = to_platram_info(pdev); |
99f2a8ae | 89 | |
3ae5eaec | 90 | platform_set_drvdata(pdev, NULL); |
99f2a8ae | 91 | |
3ae5eaec | 92 | dev_dbg(&pdev->dev, "removing device\n"); |
99f2a8ae | 93 | |
69f34c98 | 94 | if (info == NULL) |
99f2a8ae BD |
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); | |
69f34c98 | 121 | |
99f2a8ae BD |
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 | ||
3ae5eaec | 133 | static int platram_probe(struct platform_device *pdev) |
99f2a8ae | 134 | { |
99f2a8ae BD |
135 | struct platdata_mtd_ram *pdata; |
136 | struct platram_info *info; | |
137 | struct resource *res; | |
138 | int err = 0; | |
139 | ||
3ae5eaec | 140 | dev_dbg(&pdev->dev, "probe entered\n"); |
69f34c98 | 141 | |
3ae5eaec RK |
142 | if (pdev->dev.platform_data == NULL) { |
143 | dev_err(&pdev->dev, "no platform data supplied\n"); | |
99f2a8ae BD |
144 | err = -ENOENT; |
145 | goto exit_error; | |
146 | } | |
147 | ||
3ae5eaec | 148 | pdata = pdev->dev.platform_data; |
99f2a8ae BD |
149 | |
150 | info = kmalloc(sizeof(*info), GFP_KERNEL); | |
151 | if (info == NULL) { | |
3ae5eaec | 152 | dev_err(&pdev->dev, "no memory for flash info\n"); |
99f2a8ae BD |
153 | err = -ENOMEM; |
154 | goto exit_error; | |
155 | } | |
156 | ||
a921e28b | 157 | memset(info, 0, sizeof(*info)); |
3ae5eaec | 158 | platform_set_drvdata(pdev, info); |
99f2a8ae | 159 | |
3ae5eaec | 160 | info->dev = &pdev->dev; |
99f2a8ae BD |
161 | info->pdata = pdata; |
162 | ||
163 | /* get the resource for the memory mapping */ | |
164 | ||
3ae5eaec | 165 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
99f2a8ae BD |
166 | |
167 | if (res == NULL) { | |
3ae5eaec | 168 | dev_err(&pdev->dev, "no memory resource specified\n"); |
99f2a8ae BD |
169 | err = -ENOENT; |
170 | goto exit_free; | |
171 | } | |
172 | ||
3ae5eaec | 173 | dev_dbg(&pdev->dev, "got platform resource %p (0x%lx)\n", res, res->start); |
99f2a8ae BD |
174 | |
175 | /* setup map parameters */ | |
176 | ||
177 | info->map.phys = res->start; | |
178 | info->map.size = (res->end - res->start) + 1; | |
3ae5eaec | 179 | info->map.name = pdata->mapname != NULL ? pdata->mapname : (char *)pdev->name; |
99f2a8ae BD |
180 | info->map.bankwidth = pdata->bankwidth; |
181 | ||
182 | /* register our usage of the memory area */ | |
183 | ||
3ae5eaec | 184 | info->area = request_mem_region(res->start, info->map.size, pdev->name); |
99f2a8ae | 185 | if (info->area == NULL) { |
3ae5eaec | 186 | dev_err(&pdev->dev, "failed to request memory region\n"); |
99f2a8ae BD |
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); | |
3ae5eaec | 194 | dev_dbg(&pdev->dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size); |
99f2a8ae BD |
195 | |
196 | if (info->map.virt == NULL) { | |
3ae5eaec | 197 | dev_err(&pdev->dev, "failed to ioremap() region\n"); |
99f2a8ae BD |
198 | err = -EIO; |
199 | goto exit_free; | |
200 | } | |
201 | ||
99f2a8ae BD |
202 | simple_map_init(&info->map); |
203 | ||
3ae5eaec | 204 | dev_dbg(&pdev->dev, "initialised map, probing for mtd\n"); |
99f2a8ae BD |
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) { | |
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; | |
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)) { | |
3ae5eaec | 239 | dev_err(&pdev->dev, "add_mtd_device() failed\n"); |
99f2a8ae BD |
240 | err = -ENOMEM; |
241 | } | |
69f34c98 | 242 | |
3ae5eaec | 243 | dev_info(&pdev->dev, "registered mtd device\n"); |
99f2a8ae BD |
244 | return err; |
245 | ||
246 | exit_free: | |
3ae5eaec | 247 | platram_remove(pdev); |
99f2a8ae BD |
248 | exit_error: |
249 | return err; | |
250 | } | |
251 | ||
252 | /* device driver info */ | |
253 | ||
3ae5eaec | 254 | static struct platform_driver platram_driver = { |
99f2a8ae BD |
255 | .probe = platram_probe, |
256 | .remove = platram_remove, | |
3ae5eaec RK |
257 | .driver = { |
258 | .name = "mtd-ram", | |
259 | .owner = THIS_MODULE, | |
260 | }, | |
99f2a8ae BD |
261 | }; |
262 | ||
263 | /* module init/exit */ | |
264 | ||
265 | static int __init platram_init(void) | |
266 | { | |
267 | printk("Generic platform RAM MTD, (c) 2004 Simtec Electronics\n"); | |
3ae5eaec | 268 | return platform_driver_register(&platram_driver); |
99f2a8ae BD |
269 | } |
270 | ||
271 | static void __exit platram_exit(void) | |
272 | { | |
3ae5eaec | 273 | platform_driver_unregister(&platram_driver); |
99f2a8ae BD |
274 | } |
275 | ||
276 | module_init(platram_init); | |
277 | module_exit(platram_exit); | |
278 | ||
279 | MODULE_LICENSE("GPL"); | |
280 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
281 | MODULE_DESCRIPTION("MTD platform RAM map driver"); |