Merge git://git.infradead.org/mtd-2.6
[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((void *)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 = kmalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
96         if (info == NULL) {
97                 err = -ENOMEM;
98                 goto err_out;
99         }
100         memset(info, 0, sizeof(*info));
101
102         platform_set_drvdata(dev, info);
103
104         info->res = request_mem_region(dev->resource->start,
105                         dev->resource->end - dev->resource->start + 1,
106                         dev->dev.bus_id);
107         if (info->res == NULL) {
108                 dev_err(&dev->dev, "Could not reserve memory region\n");
109                 err = -ENOMEM;
110                 goto err_out;
111         }
112
113         info->map.name = dev->dev.bus_id;
114         info->map.phys = dev->resource->start;
115         info->map.size = dev->resource->end - dev->resource->start + 1;
116         info->map.bankwidth = physmap_data->width;
117         info->map.set_vpp = physmap_data->set_vpp;
118
119         info->map.virt = ioremap(info->map.phys, info->map.size);
120         if (info->map.virt == NULL) {
121                 dev_err(&dev->dev, "Failed to ioremap flash region\n");
122                 err = EIO;
123                 goto err_out;
124         }
125
126         simple_map_init(&info->map);
127
128         probe_type = rom_probe_types;
129         for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
130                 info->mtd = do_map_probe(*probe_type, &info->map);
131         if (info->mtd == NULL) {
132                 dev_err(&dev->dev, "map_probe failed\n");
133                 err = -ENXIO;
134                 goto err_out;
135         }
136         info->mtd->owner = THIS_MODULE;
137
138 #ifdef CONFIG_MTD_PARTITIONS
139         err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
140         if (err > 0) {
141                 add_mtd_partitions(info->mtd, info->parts, err);
142                 return 0;
143         }
144
145         if (physmap_data->nr_parts) {
146                 printk(KERN_NOTICE "Using physmap partition information\n");
147                 add_mtd_partitions(info->mtd, physmap_data->parts,
148                                                 physmap_data->nr_parts);
149                 return 0;
150         }
151 #endif
152
153         add_mtd_device(info->mtd);
154         return 0;
155
156 err_out:
157         physmap_flash_remove(dev);
158         return err;
159 }
160
161 static struct platform_driver physmap_flash_driver = {
162         .probe          = physmap_flash_probe,
163         .remove         = physmap_flash_remove,
164         .driver         = {
165                 .name   = "physmap-flash",
166         },
167 };
168
169
170 #ifdef CONFIG_MTD_PHYSMAP_LEN
171 #if CONFIG_MTD_PHYSMAP_LEN != 0
172 #warning using PHYSMAP compat code
173 #define PHYSMAP_COMPAT
174 #endif
175 #endif
176
177 #ifdef PHYSMAP_COMPAT
178 static struct physmap_flash_data physmap_flash_data = {
179         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
180 };
181
182 static struct resource physmap_flash_resource = {
183         .start          = CONFIG_MTD_PHYSMAP_START,
184         .end            = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
185         .flags          = IORESOURCE_MEM,
186 };
187
188 static struct platform_device physmap_flash = {
189         .name           = "physmap-flash",
190         .id             = 0,
191         .dev            = {
192                 .platform_data  = &physmap_flash_data,
193         },
194         .num_resources  = 1,
195         .resource       = &physmap_flash_resource,
196 };
197
198 void physmap_configure(unsigned long addr, unsigned long size,
199                 int bankwidth, void (*set_vpp)(struct map_info *, int))
200 {
201         physmap_flash_resource.start = addr;
202         physmap_flash_resource.end = addr + size - 1;
203         physmap_flash_data.width = bankwidth;
204         physmap_flash_data.set_vpp = set_vpp;
205 }
206
207 #ifdef CONFIG_MTD_PARTITIONS
208 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
209 {
210         physmap_flash_data.nr_parts = num_parts;
211         physmap_flash_data.parts = parts;
212 }
213 #endif
214 #endif
215
216 static int __init physmap_init(void)
217 {
218         int err;
219
220         err = platform_driver_register(&physmap_flash_driver);
221 #ifdef PHYSMAP_COMPAT
222         if (err == 0)
223                 platform_device_register(&physmap_flash);
224 #endif
225
226         return err;
227 }
228
229 static void __exit physmap_exit(void)
230 {
231 #ifdef PHYSMAP_COMPAT
232         platform_device_unregister(&physmap_flash);
233 #endif
234         platform_driver_unregister(&physmap_flash_driver);
235 }
236
237 module_init(physmap_init);
238 module_exit(physmap_exit);
239
240 MODULE_LICENSE("GPL");
241 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
242 MODULE_DESCRIPTION("Generic configurable MTD map driver");