aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/sun_uflash.c
blob: e931f1df0af1eecd394fcbb41ef690408ce1fd29 (plain) (blame)
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
/* sun_uflash.c - Driver for user-programmable flash on
 *                Sun Microsystems SME boardsets.
 *
 * This driver does NOT provide access to the OBP-flash for
 * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead.
 *
 * Copyright (c) 2001 Eric Brower (ebrower@usa.net)
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm/prom.h>
#include <asm/uaccess.h>
#include <asm/io.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>

#define UFLASH_OBPNAME	"flashprom"
#define DRIVER_NAME	"sun_uflash"
#define PFX		DRIVER_NAME ": "

#define UFLASH_WINDOW_SIZE	0x200000
#define UFLASH_BUSWIDTH		1			/* EBus is 8-bit */

MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets");
MODULE_SUPPORTED_DEVICE(DRIVER_NAME);
MODULE_LICENSE("GPL");
MODULE_VERSION("2.1");

struct uflash_dev {
	const char		*name;	/* device name */
	struct map_info 	map;	/* mtd map info */
	struct mtd_info		*mtd;	/* mtd info */
};

struct map_info uflash_map_templ = {
	.name =		"SUNW,???-????",
	.size =		UFLASH_WINDOW_SIZE,
	.bankwidth =	UFLASH_BUSWIDTH,
};

int uflash_devinit(struct of_device *op, struct device_node *dp)
{
	struct uflash_dev *up;

	if (op->resource[1].flags) {
		/* Non-CFI userflash device-- once I find one we
		 * can work on supporting it.
		 */
		printk(KERN_ERR PFX "Unsupported device at %s, 0x%llx\n",
		       dp->full_name, (unsigned long long)op->resource[0].start);

		return -ENODEV;
	}

	up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);
	if (!up) {
		printk(KERN_ERR PFX "Cannot allocate struct uflash_dev\n");
		return -ENOMEM;
	}

	/* copy defaults and tweak parameters */
	memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));

	up->map.size = resource_size(&op->resource[0]);

	up->name = of_get_property(dp, "model", NULL);
	if (up->name && 0 < strlen(up->name))
		up->map.name = (char *)up->name;

	up->map.phys = op->resource[0].start;

	up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size,
				  DRIVER_NAME);
	if (!up->map.virt) {
		printk(KERN_ERR PFX "Failed to map device.\n");
		kfree(up);

		return -EINVAL;
	}

	simple_map_init(&up->map);

	/* MTD registration */
	up->mtd = do_map_probe("cfi_probe", &up->map);
	if (!up->mtd) {
		of_iounmap(&op->resource[0], up->map.virt, up->map.size);
		kfree(up);

		return -ENXIO;
	}

	up->mtd->owner = THIS_MODULE;

	add_mtd_device(up->mtd);

	dev_set_drvdata(&op->dev, up);

	return 0;
}

static int __devinit uflash_probe(struct of_device *op, const struct of_device_id *match)
{
	struct device_node *dp = op->node;

	/* Flashprom must have the "user" property in order to
	 * be used by this driver.
	 */
	if (!of_find_property(dp, "user", NULL))
		return -ENODEV;

	return uflash_devinit(op, dp);
}

static int __devexit uflash_remove(struct of_device *op)
{
	struct uflash_dev *up = dev_get_drvdata(&op->dev);

	if (up->mtd) {
		del_mtd_device(up->mtd);
		map_destroy(up->mtd);
	}
	if (up->map.virt) {
		of_iounmap(&op->resource[0], up->map.virt, up->map.size);
		up->map.virt = NULL;
	}

	kfree(up);

	return 0;
}

static struct of_device_id uflash_match[] = {
	{
		.name = UFLASH_OBPNAME,
	},
	{},
};

MODULE_DEVICE_TABLE(of, uflash_match);

static struct of_platform_driver uflash_driver = {
	.name		= DRIVER_NAME,
	.match_table	= uflash_match,
	.probe		= uflash_probe,
	.remove		= __devexit_p(uflash_remove),
};

static int __init uflash_init(void)
{
	return of_register_driver(&uflash_driver, &of_bus_type);
}

static void __exit uflash_exit(void)
{
	of_unregister_driver(&uflash_driver);
}

module_init(uflash_init);
module_exit(uflash_exit);