aboutsummaryrefslogtreecommitdiff
path: root/drivers/mtd/maps/pxa2xx-flash.c
blob: 82113295c2661130b6970322df33240315937079 (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
/*
 * Map driver for Intel XScale PXA2xx platforms.
 *
 * Author:	Nicolas Pitre
 * Copyright:	(C) 2001 MontaVista Software Inc.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/cacheflush.h>

#include <asm/mach/flash.h>

static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
				      ssize_t len)
{
	flush_ioremap_region(map->phys, map->cached, from, len);
}

struct pxa2xx_flash_info {
	struct mtd_partition	*parts;
	int			nr_parts;
	struct mtd_info		*mtd;
	struct map_info		map;
};


static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };


static int __init pxa2xx_flash_probe(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct flash_platform_data *flash = pdev->dev.platform_data;
	struct pxa2xx_flash_info *info;
	struct mtd_partition *parts;
	struct resource *res;
	int ret = 0;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;

	info = kmalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	memset(info, 0, sizeof(struct pxa2xx_flash_info));
	info->map.name = (char *) flash->name;
	info->map.bankwidth = flash->width;
	info->map.phys = res->start;
	info->map.size = res->end - res->start + 1;
	info->parts = flash->parts;
	info->nr_parts = flash->nr_parts;

	info->map.virt = ioremap(info->map.phys, info->map.size);
	if (!info->map.virt) {
		printk(KERN_WARNING "Failed to ioremap %s\n",
		       info->map.name);
		return -ENOMEM;
	}
	info->map.cached =
		ioremap_cached(info->map.phys, info->map.size);
	if (!info->map.cached)
		printk(KERN_WARNING "Failed to ioremap cached %s\n",
		       info->map.name);
	info->map.inval_cache = pxa2xx_map_inval_cache;
	simple_map_init(&info->map);

	printk(KERN_NOTICE
	       "Probing %s at physical address 0x%08lx"
	       " (%d-bit bankwidth)\n",
	       info->map.name, (unsigned long)info->map.phys,
	       info->map.bankwidth * 8);

	info->mtd = do_map_probe(flash->map_name, &info->map);

	if (!info->mtd) {
		iounmap((void *)info->map.virt);
		if (info->map.cached)
			iounmap(info->map.cached);
		return -EIO;
	}
	info->mtd->owner = THIS_MODULE;

#ifdef CONFIG_MTD_PARTITIONS
	ret = parse_mtd_partitions(info->mtd, probes, &parts, 0);

	if (ret > 0) {
		info->nr_parts = ret;
		info->parts = parts;
	}
#endif

	if (info->nr_parts) {
		add_mtd_partitions(info->mtd, info->parts,
				   info->nr_parts);
	} else {
		printk("Registering %s as whole device\n",
		       info->map.name);
		add_mtd_device(info->mtd);
	}

	dev_set_drvdata(dev, info);
	return 0;
}

static int __exit pxa2xx_flash_remove(struct device *dev)
{
	struct pxa2xx_flash_info *info = dev_get_drvdata(dev);

	dev_set_drvdata(dev, NULL);

#ifdef CONFIG_MTD_PARTITIONS
	if (info->nr_parts)
		del_mtd_partitions(info->mtd);
	else
#endif
		del_mtd_device(info->mtd);

	map_destroy(info->mtd);
	iounmap(info->map.virt);
	if (info->map.cached)
		iounmap(info->map.cached);
	kfree(info->parts);
	kfree(info);
	return 0;
}

#ifdef CONFIG_PM
static int pxa2xx_flash_suspend(struct device *dev, pm_message_t state)
{
	struct pxa2xx_flash_info *info = dev_get_drvdata(dev);
	int ret = 0;

	if (info->mtd && info->mtd->suspend)
		ret = info->mtd->suspend(info->mtd);
	return ret;
}

static int pxa2xx_flash_resume(struct device *dev)
{
	struct pxa2xx_flash_info *info = dev_get_drvdata(dev);

	if (info->mtd && info->mtd->resume)
		info->mtd->resume(info->mtd);
	return 0;
}
static void pxa2xx_flash_shutdown(struct device *dev)
{
	struct pxa2xx_flash_info *info = dev_get_drvdata(dev);

	if (info && info->mtd->suspend(info->mtd) == 0)
		info->mtd->resume(info->mtd);
}
#else
#define pxa2xx_flash_suspend NULL
#define pxa2xx_flash_resume NULL
#define pxa2xx_flash_shutdown NULL
#endif

static struct device_driver pxa2xx_flash_driver = {
	.name		= "pxa2xx-flash",
	.bus		= &platform_bus_type,
	.probe		= pxa2xx_flash_probe,
	.remove		= __exit_p(pxa2xx_flash_remove),
	.suspend	= pxa2xx_flash_suspend,
	.resume		= pxa2xx_flash_resume,
	.shutdown	= pxa2xx_flash_shutdown,
};

static int __init init_pxa2xx_flash(void)
{
	return driver_register(&pxa2xx_flash_driver);
}

static void __exit cleanup_pxa2xx_flash(void)
{
	driver_unregister(&pxa2xx_flash_driver);
}

module_init(init_pxa2xx_flash);
module_exit(cleanup_pxa2xx_flash);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");