[LMC]: lmc_main wants to use skb_tailroom
[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 <asm/io.h>
24
25 struct physmap_flash_info {
26         struct mtd_info         *mtd;
27         struct map_info         map;
28         struct resource         *res;
29 #ifdef CONFIG_MTD_PARTITIONS
30         int                     nr_parts;
31         struct mtd_partition    *parts;
32 #endif
33 };
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
41         info = platform_get_drvdata(dev);
42         if (info == NULL)
43                 return 0;
44         platform_set_drvdata(dev, NULL);
45
46         physmap_data = dev->dev.platform_data;
47
48         if (info->mtd != NULL) {
49 #ifdef CONFIG_MTD_PARTITIONS
50                 if (info->nr_parts) {
51                         del_mtd_partitions(info->mtd);
52                         kfree(info->parts);
53                 } else if (physmap_data->nr_parts) {
54                         del_mtd_partitions(info->mtd);
55                 } else {
56                         del_mtd_device(info->mtd);
57                 }
58 #else
59                 del_mtd_device(info->mtd);
60 #endif
61                 map_destroy(info->mtd);
62         }
63
64         if (info->map.virt != NULL)
65                 iounmap(info->map.virt);
66
67         if (info->res != NULL) {
68                 release_resource(info->res);
69                 kfree(info->res);
70         }
71
72         return 0;
73 }
74
75 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
76 #ifdef CONFIG_MTD_PARTITIONS
77 static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
78 #endif
79
80 static int physmap_flash_probe(struct platform_device *dev)
81 {
82         struct physmap_flash_data *physmap_data;
83         struct physmap_flash_info *info;
84         const char **probe_type;
85         int err;
86
87         physmap_data = dev->dev.platform_data;
88         if (physmap_data == NULL)
89                 return -ENODEV;
90
91         printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
92             (unsigned long long)(dev->resource->end - dev->resource->start + 1),
93             (unsigned long long)dev->resource->start);
94
95         info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
96         if (info == NULL) {
97                 err = -ENOMEM;
98                 goto err_out;
99         }
100
101         platform_set_drvdata(dev, info);
102
103         info->res = request_mem_region(dev->resource->start,
104                         dev->resource->end - dev->resource->start + 1,
105                         dev->dev.bus_id);
106         if (info->res == NULL) {
107                 dev_err(&dev->dev, "Could not reserve memory region\n");
108                 err = -ENOMEM;
109                 goto err_out;
110         }
111
112         info->map.name = dev->dev.bus_id;
113         info->map.phys = dev->resource->start;
114         info->map.size = dev->resource->end - dev->resource->start + 1;
115         info->map.bankwidth = physmap_data->width;
116         info->map.set_vpp = physmap_data->set_vpp;
117
118         info->map.virt = ioremap(info->map.phys, info->map.size);
119         if (info->map.virt == NULL) {
120                 dev_err(&dev->dev, "Failed to ioremap flash region\n");
121                 err = EIO;
122                 goto err_out;
123         }
124
125         simple_map_init(&info->map);
126
127         probe_type = rom_probe_types;
128         for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
129                 info->mtd = do_map_probe(*probe_type, &info->map);
130         if (info->mtd == NULL) {
131                 dev_err(&dev->dev, "map_probe failed\n");
132                 err = -ENXIO;
133                 goto err_out;
134         }
135         info->mtd->owner = THIS_MODULE;
136
137 #ifdef CONFIG_MTD_PARTITIONS
138         err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
139         if (err > 0) {
140                 add_mtd_partitions(info->mtd, info->parts, err);
141                 return 0;
142         }
143
144         if (physmap_data->nr_parts) {
145                 printk(KERN_NOTICE "Using physmap partition information\n");
146                 add_mtd_partitions(info->mtd, physmap_data->parts,
147                                                 physmap_data->nr_parts);
148                 return 0;
149         }
150 #endif
151
152         add_mtd_device(info->mtd);
153         return 0;
154
155 err_out:
156         physmap_flash_remove(dev);
157         return err;
158 }
159
160 #ifdef CONFIG_PM
161 static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
162 {
163         struct physmap_flash_info *info = platform_get_drvdata(dev);
164         int ret = 0;
165
166         if (info)
167                 ret = info->mtd->suspend(info->mtd);
168
169         return ret;
170 }
171
172 static int physmap_flash_resume(struct platform_device *dev)
173 {
174         struct physmap_flash_info *info = platform_get_drvdata(dev);
175         if (info)
176                 info->mtd->resume(info->mtd);
177         return 0;
178 }
179
180 static void physmap_flash_shutdown(struct platform_device *dev)
181 {
182         struct physmap_flash_info *info = platform_get_drvdata(dev);
183         if (info && info->mtd->suspend(info->mtd) == 0)
184                 info->mtd->resume(info->mtd);
185 }
186 #endif
187
188 static struct platform_driver physmap_flash_driver = {
189         .probe          = physmap_flash_probe,
190         .remove         = physmap_flash_remove,
191 #ifdef CONFIG_PM
192         .suspend        = physmap_flash_suspend,
193         .resume         = physmap_flash_resume,
194         .shutdown       = physmap_flash_shutdown,
195 #endif
196         .driver         = {
197                 .name   = "physmap-flash",
198         },
199 };
200
201
202 #ifdef CONFIG_MTD_PHYSMAP_LEN
203 #if CONFIG_MTD_PHYSMAP_LEN != 0
204 #warning using PHYSMAP compat code
205 #define PHYSMAP_COMPAT
206 #endif
207 #endif
208
209 #ifdef PHYSMAP_COMPAT
210 static struct physmap_flash_data physmap_flash_data = {
211         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
212 };
213
214 static struct resource physmap_flash_resource = {
215         .start          = CONFIG_MTD_PHYSMAP_START,
216         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
217         .flags          = IORESOURCE_MEM,
218 };
219
220 static struct platform_device physmap_flash = {
221         .name           = "physmap-flash",
222         .id             = 0,
223         .dev            = {
224                 .platform_data  = &physmap_flash_data,
225         },
226         .num_resources  = 1,
227         .resource       = &physmap_flash_resource,
228 };
229
230 void physmap_configure(unsigned long addr, unsigned long size,
231                 int bankwidth, void (*set_vpp)(struct map_info *, int))
232 {
233         physmap_flash_resource.start = addr;
234         physmap_flash_resource.end = addr + size - 1;
235         physmap_flash_data.width = bankwidth;
236         physmap_flash_data.set_vpp = set_vpp;
237 }
238
239 #ifdef CONFIG_MTD_PARTITIONS
240 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
241 {
242         physmap_flash_data.nr_parts = num_parts;
243         physmap_flash_data.parts = parts;
244 }
245 #endif
246 #endif
247
248 static int __init physmap_init(void)
249 {
250         int err;
251
252         err = platform_driver_register(&physmap_flash_driver);
253 #ifdef PHYSMAP_COMPAT
254         if (err == 0)
255                 platform_device_register(&physmap_flash);
256 #endif
257
258         return err;
259 }
260
261 static void __exit physmap_exit(void)
262 {
263 #ifdef PHYSMAP_COMPAT
264         platform_device_unregister(&physmap_flash);
265 #endif
266         platform_driver_unregister(&physmap_flash_driver);
267 }
268
269 module_init(physmap_init);
270 module_exit(physmap_exit);
271
272 MODULE_LICENSE("GPL");
273 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
274 MODULE_DESCRIPTION("Generic configurable MTD map driver");