Merge commit 'v2.6.30-rc1' into core/urgent
[linux-2.6] / drivers / mtd / maps / physmap.c
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         if (info->cmtd) {
50 #ifdef CONFIG_MTD_PARTITIONS
51                 if (info->nr_parts || physmap_data->nr_parts)
52                         del_mtd_partitions(info->cmtd);
53                 else
54                         del_mtd_device(info->cmtd);
55 #else
56                 del_mtd_device(info->cmtd);
57 #endif
58         }
59 #ifdef CONFIG_MTD_PARTITIONS
60         if (info->nr_parts)
61                 kfree(info->parts);
62 #endif
63
64 #ifdef CONFIG_MTD_CONCAT
65         if (info->cmtd != info->mtd[0])
66                 mtd_concat_destroy(info->cmtd);
67 #endif
68
69         for (i = 0; i < MAX_RESOURCES; i++) {
70                 if (info->mtd[i] != NULL)
71                         map_destroy(info->mtd[i]);
72         }
73         return 0;
74 }
75
76 static const char *rom_probe_types[] = {
77                                         "cfi_probe",
78                                         "jedec_probe",
79                                         "qinfo_probe",
80                                         "map_rom",
81                                         NULL };
82 #ifdef CONFIG_MTD_PARTITIONS
83 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
84 #endif
85
86 static int physmap_flash_probe(struct platform_device *dev)
87 {
88         struct physmap_flash_data *physmap_data;
89         struct physmap_flash_info *info;
90         const char **probe_type;
91         int err = 0;
92         int i;
93         int devices_found = 0;
94
95         physmap_data = dev->dev.platform_data;
96         if (physmap_data == NULL)
97                 return -ENODEV;
98
99         info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
100                             GFP_KERNEL);
101         if (info == NULL) {
102                 err = -ENOMEM;
103                 goto err_out;
104         }
105
106         platform_set_drvdata(dev, info);
107
108         for (i = 0; i < dev->num_resources; i++) {
109                 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
110                        (unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
111                        (unsigned long long)dev->resource[i].start);
112
113                 if (!devm_request_mem_region(&dev->dev,
114                         dev->resource[i].start,
115                         dev->resource[i].end - dev->resource[i].start + 1,
116                         dev_name(&dev->dev))) {
117                         dev_err(&dev->dev, "Could not reserve memory region\n");
118                         err = -ENOMEM;
119                         goto err_out;
120                 }
121
122                 info->map[i].name = dev_name(&dev->dev);
123                 info->map[i].phys = dev->resource[i].start;
124                 info->map[i].size = dev->resource[i].end - dev->resource[i].start + 1;
125                 info->map[i].bankwidth = physmap_data->width;
126                 info->map[i].set_vpp = physmap_data->set_vpp;
127                 info->map[i].pfow_base = physmap_data->pfow_base;
128
129                 info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
130                                                  info->map[i].size);
131                 if (info->map[i].virt == NULL) {
132                         dev_err(&dev->dev, "Failed to ioremap flash region\n");
133                         err = EIO;
134                         goto err_out;
135                 }
136
137                 simple_map_init(&info->map[i]);
138
139                 probe_type = rom_probe_types;
140                 for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
141                         info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
142                 if (info->mtd[i] == NULL) {
143                         dev_err(&dev->dev, "map_probe failed\n");
144                         err = -ENXIO;
145                         goto err_out;
146                 } else {
147                         devices_found++;
148                 }
149                 info->mtd[i]->owner = THIS_MODULE;
150                 info->mtd[i]->dev.parent = &dev->dev;
151         }
152
153         if (devices_found == 1) {
154                 info->cmtd = info->mtd[0];
155         } else if (devices_found > 1) {
156                 /*
157                  * We detected multiple devices. Concatenate them together.
158                  */
159 #ifdef CONFIG_MTD_CONCAT
160                 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
161                 if (info->cmtd == NULL)
162                         err = -ENXIO;
163 #else
164                 printk(KERN_ERR "physmap-flash: multiple devices "
165                        "found but MTD concat support disabled.\n");
166                 err = -ENXIO;
167 #endif
168         }
169         if (err)
170                 goto err_out;
171
172 #ifdef CONFIG_MTD_PARTITIONS
173         err = parse_mtd_partitions(info->cmtd, part_probe_types,
174                                 &info->parts, 0);
175         if (err > 0) {
176                 add_mtd_partitions(info->cmtd, info->parts, err);
177                 info->nr_parts = err;
178                 return 0;
179         }
180
181         if (physmap_data->nr_parts) {
182                 printk(KERN_NOTICE "Using physmap partition information\n");
183                 add_mtd_partitions(info->cmtd, physmap_data->parts,
184                                    physmap_data->nr_parts);
185                 return 0;
186         }
187 #endif
188
189         add_mtd_device(info->cmtd);
190         return 0;
191
192 err_out:
193         physmap_flash_remove(dev);
194         return err;
195 }
196
197 #ifdef CONFIG_PM
198 static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
199 {
200         struct physmap_flash_info *info = platform_get_drvdata(dev);
201         int ret = 0;
202         int i;
203
204         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
205                 if (info->mtd[i]->suspend) {
206                         ret = info->mtd[i]->suspend(info->mtd[i]);
207                         if (ret)
208                                 goto fail;
209                 }
210
211         return 0;
212 fail:
213         for (--i; i >= 0; --i)
214                 if (info->mtd[i]->suspend) {
215                         BUG_ON(!info->mtd[i]->resume);
216                         info->mtd[i]->resume(info->mtd[i]);
217                 }
218
219         return ret;
220 }
221
222 static int physmap_flash_resume(struct platform_device *dev)
223 {
224         struct physmap_flash_info *info = platform_get_drvdata(dev);
225         int i;
226
227         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
228                 if (info->mtd[i]->resume)
229                         info->mtd[i]->resume(info->mtd[i]);
230
231         return 0;
232 }
233
234 static void physmap_flash_shutdown(struct platform_device *dev)
235 {
236         struct physmap_flash_info *info = platform_get_drvdata(dev);
237         int i;
238
239         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
240                 if (info->mtd[i]->suspend && info->mtd[i]->resume)
241                         if (info->mtd[i]->suspend(info->mtd[i]) == 0)
242                                 info->mtd[i]->resume(info->mtd[i]);
243 }
244 #else
245 #define physmap_flash_suspend NULL
246 #define physmap_flash_resume NULL
247 #define physmap_flash_shutdown NULL
248 #endif
249
250 static struct platform_driver physmap_flash_driver = {
251         .probe          = physmap_flash_probe,
252         .remove         = physmap_flash_remove,
253         .suspend        = physmap_flash_suspend,
254         .resume         = physmap_flash_resume,
255         .shutdown       = physmap_flash_shutdown,
256         .driver         = {
257                 .name   = "physmap-flash",
258                 .owner  = THIS_MODULE,
259         },
260 };
261
262
263 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
264 static struct physmap_flash_data physmap_flash_data = {
265         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
266 };
267
268 static struct resource physmap_flash_resource = {
269         .start          = CONFIG_MTD_PHYSMAP_START,
270         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
271         .flags          = IORESOURCE_MEM,
272 };
273
274 static struct platform_device physmap_flash = {
275         .name           = "physmap-flash",
276         .id             = 0,
277         .dev            = {
278                 .platform_data  = &physmap_flash_data,
279         },
280         .num_resources  = 1,
281         .resource       = &physmap_flash_resource,
282 };
283
284 void physmap_configure(unsigned long addr, unsigned long size,
285                 int bankwidth, void (*set_vpp)(struct map_info *, int))
286 {
287         physmap_flash_resource.start = addr;
288         physmap_flash_resource.end = addr + size - 1;
289         physmap_flash_data.width = bankwidth;
290         physmap_flash_data.set_vpp = set_vpp;
291 }
292
293 #ifdef CONFIG_MTD_PARTITIONS
294 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
295 {
296         physmap_flash_data.nr_parts = num_parts;
297         physmap_flash_data.parts = parts;
298 }
299 #endif
300 #endif
301
302 static int __init physmap_init(void)
303 {
304         int err;
305
306         err = platform_driver_register(&physmap_flash_driver);
307 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
308         if (err == 0)
309                 platform_device_register(&physmap_flash);
310 #endif
311
312         return err;
313 }
314
315 static void __exit physmap_exit(void)
316 {
317 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
318         platform_device_unregister(&physmap_flash);
319 #endif
320         platform_driver_unregister(&physmap_flash_driver);
321 }
322
323 module_init(physmap_init);
324 module_exit(physmap_exit);
325
326 MODULE_LICENSE("GPL");
327 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
328 MODULE_DESCRIPTION("Generic configurable MTD map driver");
329
330 /* legacy platform drivers can't hotplug or coldplg */
331 #ifndef CONFIG_MTD_PHYSMAP_COMPAT
332 /* work with hotplug and coldplug */
333 MODULE_ALIAS("platform:physmap-flash");
334 #endif