summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/rbtx4939-flash.c
blob: 83ed64512c5e6f076192abf097cb9aacde1c2ab6 (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
/*
 * rbtx4939-flash (based on physmap.c)
 *
 * This is a simplified physmap driver with map_init callback function.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Copyright (C) 2009 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
 */

#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 <asm/txx9/rbtx4939.h>

struct rbtx4939_flash_info {
	struct mtd_info *mtd;
	struct map_info map;
#ifdef CONFIG_MTD_PARTITIONS
	int nr_parts;
	struct mtd_partition *parts;
#endif
};

static int rbtx4939_flash_remove(struct platform_device *dev)
{
	struct rbtx4939_flash_info *info;

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

	if (info->mtd) {
#ifdef CONFIG_MTD_PARTITIONS
		struct rbtx4939_flash_data *pdata = dev->dev.platform_data;

		if (info->nr_parts) {
			del_mtd_partitions(info->mtd);
			kfree(info->parts);
		} else if (pdata->nr_parts)
			del_mtd_partitions(info->mtd);
		else
			del_mtd_device(info->mtd);
#else
		del_mtd_device(info->mtd);
#endif
		map_destroy(info->mtd);
	}
	return 0;
}

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

static int rbtx4939_flash_probe(struct platform_device *dev)
{
	struct rbtx4939_flash_data *pdata;
	struct rbtx4939_flash_info *info;
	struct resource *res;
	const char **probe_type;
	int err = 0;
	unsigned long size;

	pdata = dev->dev.platform_data;
	if (!pdata)
		return -ENODEV;

	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;
	info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
			    GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	platform_set_drvdata(dev, info);

	size = resource_size(res);
	pr_notice("rbtx4939 platform flash device: %pR\n", res);

	if (!devm_request_mem_region(&dev->dev, res->start, size,
				     dev_name(&dev->dev)))
		return -EBUSY;

	info->map.name = dev_name(&dev->dev);
	info->map.phys = res->start;
	info->map.size = size;
	info->map.bankwidth = pdata->width;

	info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
	if (!info->map.virt)
		return -EBUSY;

	if (pdata->map_init)
		(*pdata->map_init)(&info->map);
	else
		simple_map_init(&info->map);

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

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

	if (pdata->nr_parts) {
		pr_notice("Using rbtx4939 partition information\n");
		add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
		return 0;
	}
#endif

	add_mtd_device(info->mtd);
	return 0;

err_out:
	rbtx4939_flash_remove(dev);
	return err;
}

#ifdef CONFIG_PM
static void rbtx4939_flash_shutdown(struct platform_device *dev)
{
	struct rbtx4939_flash_info *info = platform_get_drvdata(dev);

	if (info->mtd->suspend && info->mtd->resume)
		if (info->mtd->suspend(info->mtd) == 0)
			info->mtd->resume(info->mtd);
}
#else
#define rbtx4939_flash_shutdown NULL
#endif

static struct platform_driver rbtx4939_flash_driver = {
	.probe		= rbtx4939_flash_probe,
	.remove		= rbtx4939_flash_remove,
	.shutdown	= rbtx4939_flash_shutdown,
	.driver		= {
		.name	= "rbtx4939-flash",
		.owner	= THIS_MODULE,
	},
};

static int __init rbtx4939_flash_init(void)
{
	return platform_driver_register(&rbtx4939_flash_driver);
}

static void __exit rbtx4939_flash_exit(void)
{
	platform_driver_unregister(&rbtx4939_flash_driver);
}

module_init(rbtx4939_flash_init);
module_exit(rbtx4939_flash_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("RBTX4939 MTD map driver");
MODULE_ALIAS("platform:rbtx4939-flash");
OpenPOWER on IntegriCloud