Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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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 <linux/mtd/concat.h>
24#include <asm/io.h>
25
26#define MAX_RESOURCES 4
27
28struct 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
39static 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
88static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
89#ifdef CONFIG_MTD_PARTITIONS
90static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
91#endif
92
93static 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
193err_out:
194 physmap_flash_remove(dev);
195 return err;
196}
197
198#ifdef CONFIG_PM
199static 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
211static 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
222static 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
237static 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
258static struct physmap_flash_data physmap_flash_data = {
259 .width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
260};
261
262static 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
268static 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
278void 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
288void 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
296static 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
309static 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
317module_init(physmap_init);
318module_exit(physmap_exit);
319
320MODULE_LICENSE("GPL");
321MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
322MODULE_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 */
327MODULE_ALIAS("platform:physmap-flash");
328#endif
329