summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/physmap.c
blob: 380648e9051adc1b2d25eb295147859b40f2b140 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
/*
 * Normal mappings of chips in physical memory
 *
 * Copyright (C) 2003 MontaVista Software Inc.
 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
 *
 * 031022 - [jsun] add run-time configure and partition setup
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>
#include <linux/mtd/concat.h>
#include <linux/io.h>

#define MAX_RESOURCES		4

struct physmap_flash_info {
	struct mtd_info		*mtd[MAX_RESOURCES];
	struct mtd_info		*cmtd;
	struct map_info		map[MAX_RESOURCES];
#ifdef CONFIG_MTD_PARTITIONS
	int			nr_parts;
	struct mtd_partition	*parts;
#endif
};

static int physmap_flash_remove(struct platform_device *dev)
{
	struct physmap_flash_info *info;
	struct physmap_flash_data *physmap_data;
	int i;

	info = platform_get_drvdata(dev);
	if (info == NULL)
		return 0;
	platform_set_drvdata(dev, NULL);

	physmap_data = dev->dev.platform_data;

	if (info->cmtd) {
#ifdef CONFIG_MTD_PARTITIONS
		if (info->nr_parts || physmap_data->nr_parts)
			del_mtd_partitions(info->cmtd);
		else
			del_mtd_device(info->cmtd);
#else
		del_mtd_device(info->cmtd);
#endif
	}
#ifdef CONFIG_MTD_PARTITIONS
	if (info->nr_parts)
		kfree(info->parts);
#endif

#ifdef CONFIG_MTD_CONCAT
	if (info->cmtd != info->mtd[0])
		mtd_concat_destroy(info->cmtd);
#endif

	for (i = 0; i < MAX_RESOURCES; i++) {
		if (info->mtd[i] != NULL)
			map_destroy(info->mtd[i]);
	}
	return 0;
}

static const char *rom_probe_types[] = {
					"cfi_probe",
					"jedec_probe",
					"qinfo_probe",
					"map_rom",
					NULL };
#ifdef CONFIG_MTD_PARTITIONS
static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
#endif

static int physmap_flash_probe(struct platform_device *dev)
{
	struct physmap_flash_data *physmap_data;
	struct physmap_flash_info *info;
	const char **probe_type;
	int err = 0;
	int i;
	int devices_found = 0;

	physmap_data = dev->dev.platform_data;
	if (physmap_data == NULL)
		return -ENODEV;

	info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
			    GFP_KERNEL);
	if (info == NULL) {
		err = -ENOMEM;
		goto err_out;
	}

	platform_set_drvdata(dev, info);

	for (i = 0; i < dev->num_resources; i++) {
		printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
		       (unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
		       (unsigned long long)dev->resource[i].start);

		if (!devm_request_mem_region(&dev->dev,
			dev->resource[i].start,
			dev->resource[i].end - dev->resource[i].start + 1,
			dev_name(&dev->dev))) {
			dev_err(&dev->dev, "Could not reserve memory region\n");
			err = -ENOMEM;
			goto err_out;
		}

		info->map[i].name = dev_name(&dev->dev);
		info->map[i].phys = dev->resource[i].start;
		info->map[i].size = dev->resource[i].end - dev->resource[i].start + 1;
		info->map[i].bankwidth = physmap_data->width;
		info->map[i].set_vpp = physmap_data->set_vpp;
		info->map[i].pfow_base = physmap_data->pfow_base;

		info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
						 info->map[i].size);
		if (info->map[i].virt == NULL) {
			dev_err(&dev->dev, "Failed to ioremap flash region\n");
			err = EIO;
			goto err_out;
		}

		simple_map_init(&info->map[i]);

		probe_type = rom_probe_types;
		for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
			info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
		if (info->mtd[i] == NULL) {
			dev_err(&dev->dev, "map_probe failed\n");
			err = -ENXIO;
			goto err_out;
		} else {
			devices_found++;
		}
		info->mtd[i]->owner = THIS_MODULE;
		info->mtd[i]->dev.parent = &dev->dev;
	}

	if (devices_found == 1) {
		info->cmtd = info->mtd[0];
	} else if (devices_found > 1) {
		/*
		 * We detected multiple devices. Concatenate them together.
		 */
#ifdef CONFIG_MTD_CONCAT
		info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
		if (info->cmtd == NULL)
			err = -ENXIO;
#else
		printk(KERN_ERR "physmap-flash: multiple devices "
		       "found but MTD concat support disabled.\n");
		err = -ENXIO;
#endif
	}
	if (err)
		goto err_out;

#ifdef CONFIG_MTD_PARTITIONS
	err = parse_mtd_partitions(info->cmtd, part_probe_types,
				&info->parts, 0);
	if (err > 0) {
		add_mtd_partitions(info->cmtd, info->parts, err);
		info->nr_parts = err;
		return 0;
	}

	if (physmap_data->nr_parts) {
		printk(KERN_NOTICE "Using physmap partition information\n");
		add_mtd_partitions(info->cmtd, physmap_data->parts,
				   physmap_data->nr_parts);
		return 0;
	}
#endif

	add_mtd_device(info->cmtd);
	return 0;

err_out:
	physmap_flash_remove(dev);
	return err;
}

#ifdef CONFIG_PM
static void physmap_flash_shutdown(struct platform_device *dev)
{
	struct physmap_flash_info *info = platform_get_drvdata(dev);
	int i;

	for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
		if (info->mtd[i]->suspend && info->mtd[i]->resume)
			if (info->mtd[i]->suspend(info->mtd[i]) == 0)
				info->mtd[i]->resume(info->mtd[i]);
}
#else
#define physmap_flash_shutdown NULL
#endif

static struct platform_driver physmap_flash_driver = {
	.probe		= physmap_flash_probe,
	.remove		= physmap_flash_remove,
	.shutdown	= physmap_flash_shutdown,
	.driver		= {
		.name	= "physmap-flash",
		.owner	= THIS_MODULE,
	},
};


#ifdef CONFIG_MTD_PHYSMAP_COMPAT
static struct physmap_flash_data physmap_flash_data = {
	.width		= CONFIG_MTD_PHYSMAP_BANKWIDTH,
};

static struct resource physmap_flash_resource = {
	.start		= CONFIG_MTD_PHYSMAP_START,
	.end		= CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
	.flags		= IORESOURCE_MEM,
};

static struct platform_device physmap_flash = {
	.name		= "physmap-flash",
	.id		= 0,
	.dev		= {
		.platform_data	= &physmap_flash_data,
	},
	.num_resources	= 1,
	.resource	= &physmap_flash_resource,
};

void physmap_configure(unsigned long addr, unsigned long size,
		int bankwidth, void (*set_vpp)(struct map_info *, int))
{
	physmap_flash_resource.start = addr;
	physmap_flash_resource.end = addr + size - 1;
	physmap_flash_data.width = bankwidth;
	physmap_flash_data.set_vpp = set_vpp;
}

#ifdef CONFIG_MTD_PARTITIONS
void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
{
	physmap_flash_data.nr_parts = num_parts;
	physmap_flash_data.parts = parts;
}
#endif
#endif

static int __init physmap_init(void)
{
	int err;

	err = platform_driver_register(&physmap_flash_driver);
#ifdef CONFIG_MTD_PHYSMAP_COMPAT
	if (err == 0)
		platform_device_register(&physmap_flash);
#endif

	return err;
}

static void __exit physmap_exit(void)
{
#ifdef CONFIG_MTD_PHYSMAP_COMPAT
	platform_device_unregister(&physmap_flash);
#endif
	platform_driver_unregister(&physmap_flash_driver);
}

module_init(physmap_init);
module_exit(physmap_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Generic configurable MTD map driver");

/* legacy platform drivers can't hotplug or coldplg */
#ifndef CONFIG_MTD_PHYSMAP_COMPAT
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:physmap-flash");
#endif
OpenPOWER on IntegriCloud