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[MTD] physmap: fix memory leak on physmap_flash_remove by using devres
[linux-2.6/mini2440.git] / drivers / mtd / maps / physmap.c
blobdfbf3f270cea9441a7261b69ca3c9f8aa9c87770
1 /*
2 * Normal mappings of chips in physical memory
3 *
4 * Copyright (C) 2003 MontaVista Software Inc.
5 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
6 *
7 * 031022 - [jsun] add run-time configure and partition setup
8 */
9
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/device.h>
16 #include <linux/platform_device.h>
17 #include <linux/mtd/mtd.h>
18 #include <linux/mtd/map.h>
19 #include <linux/mtd/partitions.h>
20 #include <linux/mtd/physmap.h>
21 #include <linux/mtd/concat.h>
22 #include <linux/io.h>
23
24 #define MAX_RESOURCES 4
25
26 struct physmap_flash_info {
27 struct mtd_info *mtd[MAX_RESOURCES];
28 struct mtd_info *cmtd;
29 struct map_info map[MAX_RESOURCES];
30 #ifdef CONFIG_MTD_PARTITIONS
31 int nr_parts;
32 struct mtd_partition *parts;
33 #endif
34 };
35
36 static int physmap_flash_remove(struct platform_device *dev)
37 {
38 struct physmap_flash_info *info;
39 struct physmap_flash_data *physmap_data;
40 int i;
41
42 info = platform_get_drvdata(dev);
43 if (info == NULL)
44 return 0;
45 platform_set_drvdata(dev, NULL);
46
47 physmap_data = dev->dev.platform_data;
48
49 #ifdef CONFIG_MTD_CONCAT
50 if (info->cmtd != info->mtd[0]) {
51 del_mtd_device(info->cmtd);
52 mtd_concat_destroy(info->cmtd);
53 }
54 #endif
55
56 for (i = 0; i < MAX_RESOURCES; i++) {
57 if (info->mtd[i] != NULL) {
58 #ifdef CONFIG_MTD_PARTITIONS
59 if (info->nr_parts) {
60 del_mtd_partitions(info->mtd[i]);
61 kfree(info->parts);
62 } else if (physmap_data->nr_parts) {
63 del_mtd_partitions(info->mtd[i]);
64 } else {
65 del_mtd_device(info->mtd[i]);
66 }
67 #else
68 del_mtd_device(info->mtd[i]);
69 #endif
70 map_destroy(info->mtd[i]);
71 }
72 }
73 return 0;
74 }
75
76 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
77 #ifdef CONFIG_MTD_PARTITIONS
78 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
79 #endif
80
81 static int physmap_flash_probe(struct platform_device *dev)
82 {
83 struct physmap_flash_data *physmap_data;
84 struct physmap_flash_info *info;
85 const char **probe_type;
86 int err = 0;
87 int i;
88 int devices_found = 0;
89
90 physmap_data = dev->dev.platform_data;
91 if (physmap_data == NULL)
92 return -ENODEV;
93
94 info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
95 GFP_KERNEL);
96 if (info == NULL) {
97 err = -ENOMEM;
98 goto err_out;
99 }
100
101 platform_set_drvdata(dev, info);
102
103 for (i = 0; i < dev->num_resources; i++) {
104 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
105 (unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
106 (unsigned long long)dev->resource[i].start);
107
108 if (!devm_request_mem_region(&dev->dev,
109 dev->resource[i].start,
110 dev->resource[i].end - dev->resource[i].start + 1,
111 dev->dev.bus_id)) {
112 dev_err(&dev->dev, "Could not reserve memory region\n");
113 err = -ENOMEM;
114 goto err_out;
115 }
116
117 info->map[i].name = dev->dev.bus_id;
118 info->map[i].phys = dev->resource[i].start;
119 info->map[i].size = dev->resource[i].end - dev->resource[i].start + 1;
120 info->map[i].bankwidth = physmap_data->width;
121 info->map[i].set_vpp = physmap_data->set_vpp;
122
123 info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
124 info->map[i].size);
125 if (info->map[i].virt == NULL) {
126 dev_err(&dev->dev, "Failed to ioremap flash region\n");
127 err = EIO;
128 goto err_out;
129 }
130
131 simple_map_init(&info->map[i]);
132
133 probe_type = rom_probe_types;
134 for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
135 info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
136 if (info->mtd[i] == NULL) {
137 dev_err(&dev->dev, "map_probe failed\n");
138 err = -ENXIO;
139 goto err_out;
140 } else {
141 devices_found++;
142 }
143 info->mtd[i]->owner = THIS_MODULE;
144 }
145
146 if (devices_found == 1) {
147 info->cmtd = info->mtd[0];
148 } else if (devices_found > 1) {
149 /*
150 * We detected multiple devices. Concatenate them together.
151 */
152 #ifdef CONFIG_MTD_CONCAT
153 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev->dev.bus_id);
154 if (info->cmtd == NULL)
155 err = -ENXIO;
156 #else
157 printk(KERN_ERR "physmap-flash: multiple devices "
158 "found but MTD concat support disabled.\n");
159 err = -ENXIO;
160 #endif
161 }
162 if (err)
163 goto err_out;
164
165 #ifdef CONFIG_MTD_PARTITIONS
166 err = parse_mtd_partitions(info->cmtd, part_probe_types, &info->parts, 0);
167 if (err > 0) {
168 add_mtd_partitions(info->cmtd, info->parts, err);
169 return 0;
170 }
171
172 if (physmap_data->nr_parts) {
173 printk(KERN_NOTICE "Using physmap partition information\n");
174 add_mtd_partitions(info->cmtd, physmap_data->parts,
175 physmap_data->nr_parts);
176 return 0;
177 }
178 #endif
179
180 add_mtd_device(info->cmtd);
181 return 0;
182
183 err_out:
184 physmap_flash_remove(dev);
185 return err;
186 }
187
188 #ifdef CONFIG_PM
189 static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
190 {
191 struct physmap_flash_info *info = platform_get_drvdata(dev);
192 int ret = 0;
193 int i;
194
195 for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
196 if (info->mtd[i]->suspend) {
197 ret = info->mtd[i]->suspend(info->mtd[i]);
198 if (ret)
199 goto fail;
200 }
201
202 return 0;
203 fail:
204 for (--i; i >= 0; --i)
205 if (info->mtd[i]->suspend) {
206 BUG_ON(!info->mtd[i]->resume);
207 info->mtd[i]->resume(info->mtd[i]);
208 }
209
210 return ret;
211 }
212
213 static int physmap_flash_resume(struct platform_device *dev)
214 {
215 struct physmap_flash_info *info = platform_get_drvdata(dev);
216 int i;
217
218 for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
219 if (info->mtd[i]->resume)
220 info->mtd[i]->resume(info->mtd[i]);
221
222 return 0;
223 }
224
225 static void physmap_flash_shutdown(struct platform_device *dev)
226 {
227 struct physmap_flash_info *info = platform_get_drvdata(dev);
228 int i;
229
230 for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
231 if (info->mtd[i]->suspend && info->mtd[i]->resume)
232 if (info->mtd[i]->suspend(info->mtd[i]) == 0)
233 info->mtd[i]->resume(info->mtd[i]);
234 }
235 #else
236 #define physmap_flash_suspend NULL
237 #define physmap_flash_resume NULL
238 #define physmap_flash_shutdown NULL
239 #endif
240
241 static struct platform_driver physmap_flash_driver = {
242 .probe = physmap_flash_probe,
243 .remove = physmap_flash_remove,
244 .suspend = physmap_flash_suspend,
245 .resume = physmap_flash_resume,
246 .shutdown = physmap_flash_shutdown,
247 .driver = {
248 .name = "physmap-flash",
249 .owner = THIS_MODULE,
250 },
251 };
252
253
254 #ifdef CONFIG_MTD_PHYSMAP_LEN
255 #if CONFIG_MTD_PHYSMAP_LEN != 0
256 #warning using PHYSMAP compat code
257 #define PHYSMAP_COMPAT
258 #endif
259 #endif
260
261 #ifdef PHYSMAP_COMPAT
262 static struct physmap_flash_data physmap_flash_data = {
263 .width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
264 };
265
266 static struct resource physmap_flash_resource = {
267 .start = CONFIG_MTD_PHYSMAP_START,
268 .end = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
269 .flags = IORESOURCE_MEM,
270 };
271
272 static struct platform_device physmap_flash = {
273 .name = "physmap-flash",
274 .id = 0,
275 .dev = {
276 .platform_data = &physmap_flash_data,
277 },
278 .num_resources = 1,
279 .resource = &physmap_flash_resource,
280 };
281
282 void physmap_configure(unsigned long addr, unsigned long size,
283 int bankwidth, void (*set_vpp)(struct map_info *, int))
284 {
285 physmap_flash_resource.start = addr;
286 physmap_flash_resource.end = addr + size - 1;
287 physmap_flash_data.width = bankwidth;
288 physmap_flash_data.set_vpp = set_vpp;
289 }
290
291 #ifdef CONFIG_MTD_PARTITIONS
292 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
293 {
294 physmap_flash_data.nr_parts = num_parts;
295 physmap_flash_data.parts = parts;
296 }
297 #endif
298 #endif
299
300 static int __init physmap_init(void)
301 {
302 int err;
303
304 err = platform_driver_register(&physmap_flash_driver);
305 #ifdef PHYSMAP_COMPAT
306 if (err == 0)
307 platform_device_register(&physmap_flash);
308 #endif
309
310 return err;
311 }
312
313 static void __exit physmap_exit(void)
314 {
315 #ifdef PHYSMAP_COMPAT
316 platform_device_unregister(&physmap_flash);
317 #endif
318 platform_driver_unregister(&physmap_flash_driver);
319 }
320
321 module_init(physmap_init);
322 module_exit(physmap_exit);
323
324 MODULE_LICENSE("GPL");
325 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
326 MODULE_DESCRIPTION("Generic configurable MTD map driver");
327
328 /* legacy platform drivers can't hotplug or coldplg */
329 #ifndef PHYSMAP_COMPAT
330 /* work with hotplug and coldplug */
331 MODULE_ALIAS("platform:physmap-flash");
332 #endif
333
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