4b122e7ab4b3a5efb36071359137e0a2637c80df
[sfrench/cifs-2.6.git] / 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 #ifdef CONFIG_MTD_PARTITIONS
50         if (info->nr_parts) {
51                 del_mtd_partitions(info->cmtd);
52                 kfree(info->parts);
53         } else if (physmap_data->nr_parts)
54                 del_mtd_partitions(info->cmtd);
55         else
56                 del_mtd_device(info->cmtd);
57 #else
58         del_mtd_device(info->cmtd);
59 #endif
60
61 #ifdef CONFIG_MTD_CONCAT
62         if (info->cmtd != info->mtd[0])
63                 mtd_concat_destroy(info->cmtd);
64 #endif
65
66         for (i = 0; i < MAX_RESOURCES; i++) {
67                 if (info->mtd[i] != NULL)
68                         map_destroy(info->mtd[i]);
69         }
70         return 0;
71 }
72
73 static const char *rom_probe_types[] = {
74                                         "cfi_probe",
75                                         "jedec_probe",
76                                         "qinfo_probe",
77                                         "map_rom",
78                                         NULL };
79 #ifdef CONFIG_MTD_PARTITIONS
80 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
81 #endif
82
83 static int physmap_flash_probe(struct platform_device *dev)
84 {
85         struct physmap_flash_data *physmap_data;
86         struct physmap_flash_info *info;
87         const char **probe_type;
88         int err = 0;
89         int i;
90         int devices_found = 0;
91
92         physmap_data = dev->dev.platform_data;
93         if (physmap_data == NULL)
94                 return -ENODEV;
95
96         info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
97                             GFP_KERNEL);
98         if (info == NULL) {
99                 err = -ENOMEM;
100                 goto err_out;
101         }
102
103         platform_set_drvdata(dev, info);
104
105         for (i = 0; i < dev->num_resources; i++) {
106                 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
107                        (unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
108                        (unsigned long long)dev->resource[i].start);
109
110                 if (!devm_request_mem_region(&dev->dev,
111                         dev->resource[i].start,
112                         dev->resource[i].end - dev->resource[i].start + 1,
113                         dev_name(&dev->dev))) {
114                         dev_err(&dev->dev, "Could not reserve memory region\n");
115                         err = -ENOMEM;
116                         goto err_out;
117                 }
118
119                 info->map[i].name = dev_name(&dev->dev);
120                 info->map[i].phys = dev->resource[i].start;
121                 info->map[i].size = dev->resource[i].end - dev->resource[i].start + 1;
122                 info->map[i].bankwidth = physmap_data->width;
123                 info->map[i].set_vpp = physmap_data->set_vpp;
124                 info->map[i].pfow_base = physmap_data->pfow_base;
125
126                 info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
127                                                  info->map[i].size);
128                 if (info->map[i].virt == NULL) {
129                         dev_err(&dev->dev, "Failed to ioremap flash region\n");
130                         err = EIO;
131                         goto err_out;
132                 }
133
134                 simple_map_init(&info->map[i]);
135
136                 probe_type = rom_probe_types;
137                 for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
138                         info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
139                 if (info->mtd[i] == NULL) {
140                         dev_err(&dev->dev, "map_probe failed\n");
141                         err = -ENXIO;
142                         goto err_out;
143                 } else {
144                         devices_found++;
145                 }
146                 info->mtd[i]->owner = THIS_MODULE;
147         }
148
149         if (devices_found == 1) {
150                 info->cmtd = info->mtd[0];
151         } else if (devices_found > 1) {
152                 /*
153                  * We detected multiple devices. Concatenate them together.
154                  */
155 #ifdef CONFIG_MTD_CONCAT
156                 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
157                 if (info->cmtd == NULL)
158                         err = -ENXIO;
159 #else
160                 printk(KERN_ERR "physmap-flash: multiple devices "
161                        "found but MTD concat support disabled.\n");
162                 err = -ENXIO;
163 #endif
164         }
165         if (err)
166                 goto err_out;
167
168 #ifdef CONFIG_MTD_PARTITIONS
169         err = parse_mtd_partitions(info->cmtd, part_probe_types,
170                                 &info->parts, 0);
171         if (err > 0) {
172                 add_mtd_partitions(info->cmtd, info->parts, err);
173                 info->nr_parts = err;
174                 return 0;
175         }
176
177         if (physmap_data->nr_parts) {
178                 printk(KERN_NOTICE "Using physmap partition information\n");
179                 add_mtd_partitions(info->cmtd, physmap_data->parts,
180                                    physmap_data->nr_parts);
181                 return 0;
182         }
183 #endif
184
185         add_mtd_device(info->cmtd);
186         return 0;
187
188 err_out:
189         physmap_flash_remove(dev);
190         return err;
191 }
192
193 #ifdef CONFIG_PM
194 static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
195 {
196         struct physmap_flash_info *info = platform_get_drvdata(dev);
197         int ret = 0;
198         int i;
199
200         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
201                 if (info->mtd[i]->suspend) {
202                         ret = info->mtd[i]->suspend(info->mtd[i]);
203                         if (ret)
204                                 goto fail;
205                 }
206
207         return 0;
208 fail:
209         for (--i; i >= 0; --i)
210                 if (info->mtd[i]->suspend) {
211                         BUG_ON(!info->mtd[i]->resume);
212                         info->mtd[i]->resume(info->mtd[i]);
213                 }
214
215         return ret;
216 }
217
218 static int physmap_flash_resume(struct platform_device *dev)
219 {
220         struct physmap_flash_info *info = platform_get_drvdata(dev);
221         int i;
222
223         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
224                 if (info->mtd[i]->resume)
225                         info->mtd[i]->resume(info->mtd[i]);
226
227         return 0;
228 }
229
230 static void physmap_flash_shutdown(struct platform_device *dev)
231 {
232         struct physmap_flash_info *info = platform_get_drvdata(dev);
233         int i;
234
235         for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
236                 if (info->mtd[i]->suspend && info->mtd[i]->resume)
237                         if (info->mtd[i]->suspend(info->mtd[i]) == 0)
238                                 info->mtd[i]->resume(info->mtd[i]);
239 }
240 #else
241 #define physmap_flash_suspend NULL
242 #define physmap_flash_resume NULL
243 #define physmap_flash_shutdown NULL
244 #endif
245
246 static struct platform_driver physmap_flash_driver = {
247         .probe          = physmap_flash_probe,
248         .remove         = physmap_flash_remove,
249         .suspend        = physmap_flash_suspend,
250         .resume         = physmap_flash_resume,
251         .shutdown       = physmap_flash_shutdown,
252         .driver         = {
253                 .name   = "physmap-flash",
254                 .owner  = THIS_MODULE,
255         },
256 };
257
258
259 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
260 static struct physmap_flash_data physmap_flash_data = {
261         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
262 };
263
264 static struct resource physmap_flash_resource = {
265         .start          = CONFIG_MTD_PHYSMAP_START,
266         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
267         .flags          = IORESOURCE_MEM,
268 };
269
270 static struct platform_device physmap_flash = {
271         .name           = "physmap-flash",
272         .id             = 0,
273         .dev            = {
274                 .platform_data  = &physmap_flash_data,
275         },
276         .num_resources  = 1,
277         .resource       = &physmap_flash_resource,
278 };
279
280 void physmap_configure(unsigned long addr, unsigned long size,
281                 int bankwidth, void (*set_vpp)(struct map_info *, int))
282 {
283         physmap_flash_resource.start = addr;
284         physmap_flash_resource.end = addr + size - 1;
285         physmap_flash_data.width = bankwidth;
286         physmap_flash_data.set_vpp = set_vpp;
287 }
288
289 #ifdef CONFIG_MTD_PARTITIONS
290 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
291 {
292         physmap_flash_data.nr_parts = num_parts;
293         physmap_flash_data.parts = parts;
294 }
295 #endif
296 #endif
297
298 static int __init physmap_init(void)
299 {
300         int err;
301
302         err = platform_driver_register(&physmap_flash_driver);
303 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
304         if (err == 0)
305                 platform_device_register(&physmap_flash);
306 #endif
307
308         return err;
309 }
310
311 static void __exit physmap_exit(void)
312 {
313 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
314         platform_device_unregister(&physmap_flash);
315 #endif
316         platform_driver_unregister(&physmap_flash_driver);
317 }
318
319 module_init(physmap_init);
320 module_exit(physmap_exit);
321
322 MODULE_LICENSE("GPL");
323 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
324 MODULE_DESCRIPTION("Generic configurable MTD map driver");
325
326 /* legacy platform drivers can't hotplug or coldplg */
327 #ifndef CONFIG_MTD_PHYSMAP_COMPAT
328 /* work with hotplug and coldplug */
329 MODULE_ALIAS("platform:physmap-flash");
330 #endif