aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/ifxmips/files/drivers/mtd/maps/ifxmips.c
blob: 3a3569ac8adfb03d9ff44b78ec2f118bc9c281e7 (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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
/*
 * 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
 *
 * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
 * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
 */

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

#include <ifxmips.h>
#include <ifxmips_prom.h>
#include <ifxmips_ebu.h>

#ifndef CONFIG_MTD_PARTITIONS
#error Please enable CONFIG_MTD_PARTITIONS
#endif

static struct map_info ifxmips_map = {
	.name = "ifx-nor",
	.bankwidth = 2,
	.size = 0x400000,
};

static map_word ifxmips_read16(struct map_info *map, unsigned long adr)
{
	unsigned long flags;
	map_word temp;
	spin_lock_irqsave(&ebu_lock, flags);
	adr ^= 2;
	temp.x[0] = *((__u16 *)(map->virt + adr));
	spin_unlock_irqrestore(&ebu_lock, flags);
	return temp;
}

static void ifxmips_write16(struct map_info *map, map_word d, unsigned long adr)
{
	unsigned long flags;
	spin_lock_irqsave(&ebu_lock, flags);
	adr ^= 2;
	*((__u16 *)(map->virt + adr)) = d.x[0];
	spin_unlock_irqrestore(&ebu_lock, flags);
}

void ifxmips_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
	unsigned char *p;
	unsigned char *to_8;
	unsigned long flags;
	spin_lock_irqsave(&ebu_lock, flags);
	from = (unsigned long)(from + map->virt);
	p = (unsigned char *) from;
	to_8 = (unsigned char *) to;
	while (len--)
		*to_8++ = *p++;
	spin_unlock_irqrestore(&ebu_lock, flags);
}

void ifxmips_copy_to(struct map_info *map,
		     unsigned long to,
		     const void *from,
		     ssize_t len)
{
	unsigned char *p =  (unsigned char *)from;
	unsigned char *to_8;
	unsigned long flags;
	spin_lock_irqsave(&ebu_lock, flags);
	to += (unsigned long) map->virt;
	to_8 = (unsigned char *)to;
	while (len--)
		*p++ = *to_8++;
	spin_unlock_irqrestore(&ebu_lock, flags);
}

static struct mtd_partition ifxmips_partitions[] = {
	{
		.name = "uboot",
		.offset = 0x00000000,
		.size = 0x00020000,
	},
	{
		.name = "uboot_env",
		.offset = 0x00020000,
		.size = 0x00010000,
	},
	{
		.name = "kernel",
		.offset = 0x00030000,
		.size = 0x0,
	},
	{
		.name = "rootfs",
		.offset = 0x0,
		.size = 0x0,
	},
	{
		.name = "board_config",
		.offset = 0x0,
		.size = 0x0,
	},
};

static struct mtd_partition ifxmips_meta_partition = {
	.name = "linux",
	.offset = 0x00030000,
	.size = 0x0,
};

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

int find_uImage_size(unsigned long start_offset)
{
	unsigned long magic;
	unsigned long temp;
	ifxmips_copy_from(&ifxmips_map, &magic, start_offset, 4);
	if (le32_to_cpu(magic) != 0x56190527) {
		printk(KERN_INFO "ifxmips_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", le32_to_cpu(magic), start_offset);
		return 0;
	}
	ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4);
	printk(KERN_INFO "ifxmips_mtd: kernel size is %ld \n", temp + 0x40);
	return temp + 0x40;
}

int find_brn_block(unsigned long start_offset)
{
	unsigned char temp[9];
	ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 8);
	temp[8] = '\0';
	printk(KERN_INFO "data in brn block %s\n", temp);
	if (memcmp(temp, "BRN-BOOT", 8) == 0)
		return 1;
	else
		return 0;
}

int detect_squashfs_partition(unsigned long start_offset)
{
	unsigned long temp;
	ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4);
	return le32_to_cpu(temp) == SQUASHFS_MAGIC;
}

static int ifxmips_mtd_probe(struct platform_device *dev)
{
	struct mtd_info *ifxmips_mtd = NULL;
	struct mtd_partition *parts = NULL;
	unsigned long uimage_size;
	int err, i;
	int kernel_part = 2, rootfs_part = 3;
	int num_parts = ARRAY_SIZE(ifxmips_partitions);

	ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0);

	ifxmips_map.read = ifxmips_read16;
	ifxmips_map.write = ifxmips_write16;
	ifxmips_map.copy_from = ifxmips_copy_from;
	ifxmips_map.copy_to = ifxmips_copy_to;
	ifxmips_map.phys = dev->resource->start;
	ifxmips_map.size = dev->resource->end - ifxmips_map.phys + 1;
	ifxmips_map.virt = ioremap_nocache(ifxmips_map.phys, ifxmips_map.size);

	if (!ifxmips_map.virt) {
		printk(KERN_WARNING "ifxmips_mtd: failed to ioremap!\n");
		return -EIO;
	}

	ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map);
	if (!ifxmips_mtd) {
		iounmap(ifxmips_map.virt);
		printk(KERN_WARNING "ifxmips_mtd: probing failed\n");
		return -ENXIO;
	}

	ifxmips_mtd->owner = THIS_MODULE;

	err = parse_mtd_partitions(ifxmips_mtd, part_probe_types, &parts, 0);
	if (err > 0) {
		printk(KERN_INFO "ifxmips_mtd: found %d partitions from cmdline\n", err);
		num_parts = err;
		kernel_part = 0;
		rootfs_part = 0;
		for (i = 0; i < num_parts; i++) {
			if (strcmp(parts[i].name, "kernel") == 0)
				kernel_part = i;
			if (strcmp(parts[i].name, "rootfs") == 0)
				rootfs_part = i;
		}
	} else {
		parts = &ifxmips_partitions[0];
	}

	/* dynamic size detection only if rootfs-part follows kernel-part */
	if (kernel_part+1 == rootfs_part) {
		uimage_size = find_uImage_size(parts[kernel_part].offset);

		if (detect_squashfs_partition(parts[kernel_part].offset + uimage_size)) {
			printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n");
		} else {
			uimage_size &= ~0xffff;
			uimage_size += 0x10000;
		}

		parts[kernel_part].size = uimage_size;
		parts[rootfs_part].offset = parts[kernel_part].offset + parts[kernel_part].size;
		parts[rootfs_part].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - parts[rootfs_part].offset;

		ifxmips_meta_partition.offset = parts[kernel_part].offset;
		ifxmips_meta_partition.size = parts[kernel_part].size + parts[rootfs_part].size;
	}

	if (err <= 0) {
		if (ifxmips_has_brn_block()) {
			parts[3].size -= ifxmips_mtd->erasesize;
			parts[4].offset = ifxmips_mtd->size - ifxmips_mtd->erasesize;
			parts[4].size = ifxmips_mtd->erasesize;
		} else {
			num_parts--;
		}
	}

	add_mtd_partitions(ifxmips_mtd, parts, num_parts);
	add_mtd_partitions(ifxmips_mtd, &ifxmips_meta_partition, 1);

	printk(KERN_INFO "ifxmips_mtd: added %s flash with %dMB\n",
		ifxmips_map.name, ifxmips_mtd->size);
	return 0;
}

static struct platform_driver ifxmips_mtd_driver = {
	.probe = ifxmips_mtd_probe,
	.driver = {
		.name = "ifxmips_mtd",
		.owner = THIS_MODULE,
	},
};

int __init init_ifxmips_mtd(void)
{
	int ret = platform_driver_register(&ifxmips_mtd_driver);
	if (ret)
		printk(KERN_INFO "ifxmips_mtd: error registering platfom driver!");
	return ret;
}

static void __exit cleanup_ifxmips_mtd(void)
{
	platform_driver_unregister(&ifxmips_mtd_driver);
}

module_init(init_ifxmips_mtd);
module_exit(cleanup_ifxmips_mtd);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");