Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
25struct 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
36static 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
75static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
76#ifdef CONFIG_MTD_PARTITIONS
77static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
78#endif
79
80static 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
156err_out:
157 physmap_flash_remove(dev);
158 return err;
159}
160
161#ifdef CONFIG_PM
162static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
163{
164 struct physmap_flash_info *info = platform_get_drvdata(dev);
165 int ret = 0;
166
167 if (info)
168 ret = info->mtd->suspend(info->mtd);
169
170 return ret;
171}
172
173static int physmap_flash_resume(struct platform_device *dev)
174{
175 struct physmap_flash_info *info = platform_get_drvdata(dev);
176 if (info)
177 info->mtd->resume(info->mtd);
178 return 0;
179}
180
181static void physmap_flash_shutdown(struct platform_device *dev)
182{
183 struct physmap_flash_info *info = platform_get_drvdata(dev);
184 if (info && info->mtd->suspend(info->mtd) == 0)
185 info->mtd->resume(info->mtd);
186}
187#endif
188
189static struct platform_driver physmap_flash_driver = {
190 .probe = physmap_flash_probe,
191 .remove = physmap_flash_remove,
192#ifdef CONFIG_PM
193 .suspend = physmap_flash_suspend,
194 .resume = physmap_flash_resume,
195 .shutdown = physmap_flash_shutdown,
196#endif
197 .driver = {
198 .name = "physmap-flash",
199 },
200};
201
202
203#ifdef CONFIG_MTD_PHYSMAP_LEN
204#if CONFIG_MTD_PHYSMAP_LEN != 0
205#warning using PHYSMAP compat code
206#define PHYSMAP_COMPAT
207#endif
208#endif
209
210#ifdef PHYSMAP_COMPAT
211static struct physmap_flash_data physmap_flash_data = {
212 .width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
213};
214
215static struct resource physmap_flash_resource = {
216 .start = CONFIG_MTD_PHYSMAP_START,
217 .end = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
218 .flags = IORESOURCE_MEM,
219};
220
221static struct platform_device physmap_flash = {
222 .name = "physmap-flash",
223 .id = 0,
224 .dev = {
225 .platform_data = &physmap_flash_data,
226 },
227 .num_resources = 1,
228 .resource = &physmap_flash_resource,
229};
230
231void physmap_configure(unsigned long addr, unsigned long size,
232 int bankwidth, void (*set_vpp)(struct map_info *, int))
233{
234 physmap_flash_resource.start = addr;
235 physmap_flash_resource.end = addr + size - 1;
236 physmap_flash_data.width = bankwidth;
237 physmap_flash_data.set_vpp = set_vpp;
238}
239
240#ifdef CONFIG_MTD_PARTITIONS
241void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
242{
243 physmap_flash_data.nr_parts = num_parts;
244 physmap_flash_data.parts = parts;
245}
246#endif
247#endif
248
249static int __init physmap_init(void)
250{
251 int err;
252
253 err = platform_driver_register(&physmap_flash_driver);
254#ifdef PHYSMAP_COMPAT
255 if (err == 0)
256 platform_device_register(&physmap_flash);
257#endif
258
259 return err;
260}
261
262static void __exit physmap_exit(void)
263{
264#ifdef PHYSMAP_COMPAT
265 platform_device_unregister(&physmap_flash);
266#endif
267 platform_driver_unregister(&physmap_flash_driver);
268}
269
270module_init(physmap_init);
271module_exit(physmap_exit);
272
273MODULE_LICENSE("GPL");
274MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
275MODULE_DESCRIPTION("Generic configurable MTD map driver");