summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/integrator-flash.c
blob: e39a98a0171c801b44b0eec73730d2ebb8df5120 (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
/*======================================================================

    drivers/mtd/maps/integrator-flash.c: ARM Integrator flash map driver
  
    Copyright (C) 2000 ARM Limited
    Copyright (C) 2003 Deep Blue Solutions Ltd.
  
   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 program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
  
   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  
   This is access code for flashes using ARM's flash partitioning 
   standards.

   $Id: integrator-flash.c,v 1.18 2004/11/01 13:26:15 rmk Exp $

======================================================================*/

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

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

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

#ifdef CONFIG_ARCH_P720T
#define FLASH_BASE		(0x04000000)
#define FLASH_SIZE		(64*1024*1024)
#endif

struct armflash_info {
	struct flash_platform_data *plat;
	struct resource		*res;
	struct mtd_partition	*parts;
	struct mtd_info		*mtd;
	struct map_info		map;
};

static void armflash_set_vpp(struct map_info *map, int on)
{
	struct armflash_info *info = container_of(map, struct armflash_info, map);

	if (info->plat && info->plat->set_vpp)
		info->plat->set_vpp(on);
}

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

static int armflash_probe(struct device *_dev)
{
	struct platform_device *dev = to_platform_device(_dev);
	struct flash_platform_data *plat = dev->dev.platform_data;
	struct resource *res = dev->resource;
	unsigned int size = res->end - res->start + 1;
	struct armflash_info *info;
	int err;
	void __iomem *base;

	info = kmalloc(sizeof(struct armflash_info), GFP_KERNEL);
	if (!info) {
		err = -ENOMEM;
		goto out;
	}

	memset(info, 0, sizeof(struct armflash_info));

	info->plat = plat;
	if (plat && plat->init) {
		err = plat->init();
		if (err)
			goto no_resource;
	}

	info->res = request_mem_region(res->start, size, "armflash");
	if (!info->res) {
		err = -EBUSY;
		goto no_resource;
	}

	base = ioremap(res->start, size);
	if (!base) {
		err = -ENOMEM;
		goto no_mem;
	}

	/*
	 * look for CFI based flash parts fitted to this board
	 */
	info->map.size		= size;
	info->map.bankwidth	= plat->width;
	info->map.phys		= res->start;
	info->map.virt		= base;
	info->map.name		= dev->dev.bus_id;
	info->map.set_vpp	= armflash_set_vpp;

	simple_map_init(&info->map);

	/*
	 * Also, the CFI layer automatically works out what size
	 * of chips we have, and does the necessary identification
	 * for us automatically.
	 */
	info->mtd = do_map_probe(plat->map_name, &info->map);
	if (!info->mtd) {
		err = -ENXIO;
		goto no_device;
	}

	info->mtd->owner = THIS_MODULE;

	err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
	if (err > 0) {
		err = add_mtd_partitions(info->mtd, info->parts, err);
		if (err)
			printk(KERN_ERR
			       "mtd partition registration failed: %d\n", err);
	}

	if (err == 0)
		dev_set_drvdata(&dev->dev, info);

	/*
	 * If we got an error, free all resources.
	 */
	if (err < 0) {
		if (info->mtd) {
			del_mtd_partitions(info->mtd);
			map_destroy(info->mtd);
		}
		if (info->parts)
			kfree(info->parts);

 no_device:
		iounmap(base);
 no_mem:
		release_mem_region(res->start, size);
 no_resource:
		if (plat && plat->exit)
			plat->exit();
		kfree(info);
	}
 out:
	return err;
}

static int armflash_remove(struct device *_dev)
{
	struct platform_device *dev = to_platform_device(_dev);
	struct armflash_info *info = dev_get_drvdata(&dev->dev);

	dev_set_drvdata(&dev->dev, NULL);

	if (info) {
		if (info->mtd) {
			del_mtd_partitions(info->mtd);
			map_destroy(info->mtd);
		}
		if (info->parts)
			kfree(info->parts);

		iounmap(info->map.virt);
		release_resource(info->res);
		kfree(info->res);

		if (info->plat && info->plat->exit)
			info->plat->exit();

		kfree(info);
	}

	return 0;
}

static struct device_driver armflash_driver = {
	.name		= "armflash",
	.bus		= &platform_bus_type,
	.probe		= armflash_probe,
	.remove		= armflash_remove,
};

static int __init armflash_init(void)
{
	return driver_register(&armflash_driver);
}

static void __exit armflash_exit(void)
{
	driver_unregister(&armflash_driver);
}

module_init(armflash_init);
module_exit(armflash_exit);

MODULE_AUTHOR("ARM Ltd");
MODULE_DESCRIPTION("ARM Integrator CFI map driver");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud