Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[linux-2.6] / drivers / mtd / maps / physmap.c
1 /*
2  * $Id: physmap.c,v 1.39 2005/11/29 14:49:36 gleixner Exp $
3  *
4  * Normal mappings of chips in physical memory
5  *
6  * Copyright (C) 2003 MontaVista Software Inc.
7  * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
8  *
9  * 031022 - [jsun] add run-time configure and partition setup
10  */
11
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/device.h>
18 #include <linux/platform_device.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/mtd/map.h>
21 #include <linux/mtd/partitions.h>
22 #include <linux/mtd/physmap.h>
23 #include <linux/mtd/concat.h>
24 #include <asm/io.h>
25
26 #define MAX_RESOURCES           4
27
28 struct physmap_flash_info {
29         struct mtd_info         *mtd[MAX_RESOURCES];
30         struct mtd_info         *cmtd;
31         struct map_info         map[MAX_RESOURCES];
32         struct resource         *res;
33 #ifdef CONFIG_MTD_PARTITIONS
34         int                     nr_parts;
35         struct mtd_partition    *parts;
36 #endif
37 };
38
39 static int physmap_flash_remove(struct platform_device *dev)
40 {
41         struct physmap_flash_info *info;
42         struct physmap_flash_data *physmap_data;
43         int i;
44
45         info = platform_get_drvdata(dev);
46         if (info == NULL)
47                 return 0;
48         platform_set_drvdata(dev, NULL);
49
50         physmap_data = dev->dev.platform_data;
51
52 #ifdef CONFIG_MTD_CONCAT
53         if (info->cmtd != info->mtd[0]) {
54                 del_mtd_device(info->cmtd);
55                 mtd_concat_destroy(info->cmtd);
56         }
57 #endif
58
59         for (i = 0; i < MAX_RESOURCES; i++) {
60                 if (info->mtd[i] != NULL) {
61 #ifdef CONFIG_MTD_PARTITIONS
62                         if (info->nr_parts) {
63                                 del_mtd_partitions(info->mtd[i]);
64                                 kfree(info->parts);
65                         } else if (physmap_data->nr_parts) {
66                                 del_mtd_partitions(info->mtd[i]);
67                         } else {
68                                 del_mtd_device(info->mtd[i]);
69                         }
70 #else
71                         del_mtd_device(info->mtd[i]);
72 #endif
73                         map_destroy(info->mtd[i]);
74                 }
75
76                 if (info->map[i].virt != NULL)
77                         iounmap(info->map[i].virt);
78         }
79
80         if (info->res != NULL) {
81                 release_resource(info->res);
82                 kfree(info->res);
83         }
84
85         return 0;
86 }
87
88 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
89 #ifdef CONFIG_MTD_PARTITIONS
90 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
91 #endif
92
93 static int physmap_flash_probe(struct platform_device *dev)
94 {
95         struct physmap_flash_data *physmap_data;
96         struct physmap_flash_info *info;
97         const char **probe_type;
98         int err = 0;
99         int i;
100         int devices_found = 0;
101
102         physmap_data = dev->dev.platform_data;
103         if (physmap_data == NULL)
104                 return -ENODEV;
105
106         info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
107         if (info == NULL) {
108                 err = -ENOMEM;
109                 goto err_out;
110         }
111
112         platform_set_drvdata(dev, info);
113
114         for (i = 0; i < dev->num_resources; i++) {
115                 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
116                        (unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
117                        (unsigned long long)dev->resource[i].start);
118
119                 info->res = request_mem_region(dev->resource[i].start,
120                                                dev->resource[i].end - dev->resource[i].start + 1,
121                                                dev->dev.bus_id);
122                 if (info->res == NULL) {
123                         dev_err(&dev->dev, "Could not reserve memory region\n");
124                         err = -ENOMEM;
125                         goto err_out;
126                 }
127
128                 info->map[i].name = dev->dev.bus_id;
129                 info->map[i].phys = dev->resource[i].start;
130                 info->map[i].size = dev->resource[i].end - dev->resource[i].start + 1;
131                 info->map[i].bankwidth = physmap_data->width;
132                 info->map[i].set_vpp = physmap_data->set_vpp;
133
134                 info->map[i].virt = ioremap(info->map[i].phys, info->map[i].size);
135                 if (info->map[i].virt == NULL) {
136                         dev_err(&dev->dev, "Failed to ioremap flash region\n");
137                         err = EIO;
138                         goto err_out;
139                 }
140
141                 simple_map_init(&info->map[i]);
142
143                 probe_type = rom_probe_types;
144                 for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
145                         info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
146                 if (info->mtd[i] == NULL) {
147                         dev_err(&dev->dev, "map_probe failed\n");
148                         err = -ENXIO;
149                         goto err_out;
150                 } else {
151                         devices_found++;
152                 }
153                 info->mtd[i]->owner = THIS_MODULE;
154         }
155
156         if (devices_found == 1) {
157                 info->cmtd = info->mtd[0];
158         } else if (devices_found > 1) {
159                 /*
160                  * We detected multiple devices. Concatenate them together.
161                  */
162 #ifdef CONFIG_MTD_CONCAT
163                 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev->dev.bus_id);
164                 if (info->cmtd == NULL)
165                         err = -ENXIO;
166 #else
167                 printk(KERN_ERR "physmap-flash: multiple devices "
168                        "found but MTD concat support disabled.\n");
169                 err = -ENXIO;
170 #endif
171         }
172         if (err)
173                 goto err_out;
174
175 #ifdef CONFIG_MTD_PARTITIONS
176         err = parse_mtd_partitions(info->cmtd, part_probe_types, &info->parts, 0);
177         if (err > 0) {
178                 add_mtd_partitions(info->cmtd, info->parts, err);
179                 return 0;
180         }
181
182         if (physmap_data->nr_parts) {
183                 printk(KERN_NOTICE "Using physmap partition information\n");
184                 add_mtd_partitions(info->cmtd, physmap_data->parts,
185                                    physmap_data->nr_parts);
186                 return 0;
187         }
188 #endif
189
190         add_mtd_device(info->cmtd);
191         return 0;
192
193 err_out:
194         physmap_flash_remove(dev);
195         return err;
196 }
197
198 #ifdef CONFIG_PM
199 static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
200 {
201         struct physmap_flash_info *info = platform_get_drvdata(dev);
202         int ret = 0;
203         int i;
204
205         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
206                 ret |= info->mtd[i]->suspend(info->mtd[i]);
207
208         return ret;
209 }
210
211 static int physmap_flash_resume(struct platform_device *dev)
212 {
213         struct physmap_flash_info *info = platform_get_drvdata(dev);
214         int i;
215
216         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
217                 info->mtd[i]->resume(info->mtd[i]);
218
219         return 0;
220 }
221
222 static void physmap_flash_shutdown(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]->suspend(info->mtd[i]) == 0)
229                         info->mtd[i]->resume(info->mtd[i]);
230 }
231 #else
232 #define physmap_flash_suspend NULL
233 #define physmap_flash_resume NULL
234 #define physmap_flash_shutdown NULL
235 #endif
236
237 static struct platform_driver physmap_flash_driver = {
238         .probe          = physmap_flash_probe,
239         .remove         = physmap_flash_remove,
240         .suspend        = physmap_flash_suspend,
241         .resume         = physmap_flash_resume,
242         .shutdown       = physmap_flash_shutdown,
243         .driver         = {
244                 .name   = "physmap-flash",
245                 .owner  = THIS_MODULE,
246         },
247 };
248
249
250 #ifdef CONFIG_MTD_PHYSMAP_LEN
251 #if CONFIG_MTD_PHYSMAP_LEN != 0
252 #warning using PHYSMAP compat code
253 #define PHYSMAP_COMPAT
254 #endif
255 #endif
256
257 #ifdef PHYSMAP_COMPAT
258 static struct physmap_flash_data physmap_flash_data = {
259         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
260 };
261
262 static struct resource physmap_flash_resource = {
263         .start          = CONFIG_MTD_PHYSMAP_START,
264         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
265         .flags          = IORESOURCE_MEM,
266 };
267
268 static struct platform_device physmap_flash = {
269         .name           = "physmap-flash",
270         .id             = 0,
271         .dev            = {
272                 .platform_data  = &physmap_flash_data,
273         },
274         .num_resources  = 1,
275         .resource       = &physmap_flash_resource,
276 };
277
278 void physmap_configure(unsigned long addr, unsigned long size,
279                 int bankwidth, void (*set_vpp)(struct map_info *, int))
280 {
281         physmap_flash_resource.start = addr;
282         physmap_flash_resource.end = addr + size - 1;
283         physmap_flash_data.width = bankwidth;
284         physmap_flash_data.set_vpp = set_vpp;
285 }
286
287 #ifdef CONFIG_MTD_PARTITIONS
288 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
289 {
290         physmap_flash_data.nr_parts = num_parts;
291         physmap_flash_data.parts = parts;
292 }
293 #endif
294 #endif
295
296 static int __init physmap_init(void)
297 {
298         int err;
299
300         err = platform_driver_register(&physmap_flash_driver);
301 #ifdef PHYSMAP_COMPAT
302         if (err == 0)
303                 platform_device_register(&physmap_flash);
304 #endif
305
306         return err;
307 }
308
309 static void __exit physmap_exit(void)
310 {
311 #ifdef PHYSMAP_COMPAT
312         platform_device_unregister(&physmap_flash);
313 #endif
314         platform_driver_unregister(&physmap_flash_driver);
315 }
316
317 module_init(physmap_init);
318 module_exit(physmap_exit);
319
320 MODULE_LICENSE("GPL");
321 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
322 MODULE_DESCRIPTION("Generic configurable MTD map driver");
323
324 /* legacy platform drivers can't hotplug or coldplg */
325 #ifndef PHYSMAP_COMPAT
326 /* work with hotplug and coldplug */
327 MODULE_ALIAS("platform:physmap-flash");
328 #endif
329