summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/omap_nor.c
blob: 771e6806c58df364dbbd01f1fcf0947c59756ad4 (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
/*
 * Flash memory support for various TI OMAP boards
 *
 * Copyright (C) 2001-2002 MontaVista Software Inc.
 * Copyright (C) 2003-2004 Texas Instruments
 * Copyright (C) 2004 Nokia Corporation
 *
 *	Assembled using driver code copyright the companies above
 *	and written by David Brownell, Jian Zhang <jzhang@ti.com>,
 * 	Tony Lindgren <tony@atomide.com> and others.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * You should have received a copy of the  GNU General Public License along
 * with this program; if not, write  to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/slab.h>

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

#include <asm/io.h>
#include <asm/arch/hardware.h>
#include <asm/mach/flash.h>
#include <asm/arch/tc.h>

#ifdef CONFIG_MTD_PARTITIONS
static const char *part_probes[] = { /* "RedBoot", */ "cmdlinepart", NULL };
#endif

struct omapflash_info {
	struct mtd_partition	*parts;
	struct mtd_info		*mtd;
	struct map_info		map;
};

static void omap_set_vpp(struct map_info *map, int enable)
{
	static int	count;
	u32 l;

	if (cpu_class_is_omap1()) {
		if (enable) {
			if (count++ == 0) {
				l = omap_readl(EMIFS_CONFIG);
				l |= OMAP_EMIFS_CONFIG_WP;
				omap_writel(l, EMIFS_CONFIG);
			}
		} else {
			if (count && (--count == 0)) {
				l = omap_readl(EMIFS_CONFIG);
				l &= ~OMAP_EMIFS_CONFIG_WP;
				omap_writel(l, EMIFS_CONFIG);
			}
		}
	}
}

static int __init omapflash_probe(struct platform_device *pdev)
{
	int err;
	struct omapflash_info *info;
	struct flash_platform_data *pdata = pdev->dev.platform_data;
	struct resource *res = pdev->resource;
	unsigned long size = res->end - res->start + 1;

	info = kzalloc(sizeof(struct omapflash_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	if (!request_mem_region(res->start, size, "flash")) {
		err = -EBUSY;
		goto out_free_info;
	}

	info->map.virt		= ioremap(res->start, size);
	if (!info->map.virt) {
		err = -ENOMEM;
		goto out_release_mem_region;
	}
	info->map.name		= pdev->dev.bus_id;
	info->map.phys		= res->start;
	info->map.size		= size;
	info->map.bankwidth	= pdata->width;
	info->map.set_vpp	= omap_set_vpp;

	simple_map_init(&info->map);
	info->mtd = do_map_probe(pdata->map_name, &info->map);
	if (!info->mtd) {
		err = -EIO;
		goto out_iounmap;
	}
	info->mtd->owner = THIS_MODULE;

#ifdef CONFIG_MTD_PARTITIONS
	err = parse_mtd_partitions(info->mtd, part_probes, &info->parts, 0);
	if (err > 0)
		add_mtd_partitions(info->mtd, info->parts, err);
	else if (err <= 0 && pdata->parts)
		add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
	else
#endif
		add_mtd_device(info->mtd);

	platform_set_drvdata(pdev, info);

	return 0;

out_iounmap:
	iounmap(info->map.virt);
out_release_mem_region:
	release_mem_region(res->start, size);
out_free_info:
	kfree(info);

	return err;
}

static int __exit omapflash_remove(struct platform_device *pdev)
{
	struct omapflash_info *info = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);

	if (info) {
		if (info->parts) {
			del_mtd_partitions(info->mtd);
			kfree(info->parts);
		} else
			del_mtd_device(info->mtd);
		map_destroy(info->mtd);
		release_mem_region(info->map.phys, info->map.size);
		iounmap((void __iomem *) info->map.virt);
		kfree(info);
	}

	return 0;
}

static struct platform_driver omapflash_driver = {
	.remove	= __exit_p(omapflash_remove),
	.driver = {
		.name	= "omapflash",
		.owner	= THIS_MODULE,
	},
};

static int __init omapflash_init(void)
{
	return platform_driver_probe(&omapflash_driver, omapflash_probe);
}

static void __exit omapflash_exit(void)
{
	platform_driver_unregister(&omapflash_driver);
}

module_init(omapflash_init);
module_exit(omapflash_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MTD NOR map driver for TI OMAP boards");
MODULE_ALIAS("platform:omapflash");
OpenPOWER on IntegriCloud