aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/sbc8240.c
blob: 6e1e99cd2b59c443715450c03b7f446261ac1776 (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
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
/*
 * Handle mapping of the flash memory access routines on the SBC8240 board.
 *
 * Carolyn Smith, Tektronix, Inc.
 *
 * This code is GPLed
 */

/*
 * The SBC8240 has 2 flash banks.
 * Bank 0 is a 512 KiB AMD AM29F040B; 8 x 64 KiB sectors.
 * It contains the U-Boot code (7 sectors) and the environment (1 sector).
 * Bank 1 is 4 x 1 MiB AMD AM29LV800BT; 15 x 64 KiB sectors, 1 x 32 KiB sector,
 * 2 x 8 KiB sectors, 1 x 16 KiB sectors.
 * Both parts are JEDEC compatible.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>

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

#ifdef CONFIG_MTD_PARTITIONS
#include <linux/mtd/partitions.h>
#endif

#define	DEBUG

#ifdef	DEBUG
# define debugk(fmt,args...)	printk(fmt ,##args)
#else
# define debugk(fmt,args...)
#endif


#define WINDOW_ADDR0	0xFFF00000		/* 512 KiB */
#define WINDOW_SIZE0	0x00080000
#define BUSWIDTH0	1

#define WINDOW_ADDR1	0xFF000000		/* 4 MiB */
#define WINDOW_SIZE1	0x00400000
#define BUSWIDTH1	8

#define MSG_PREFIX "sbc8240:"	/* prefix for our printk()'s */
#define MTDID	   "sbc8240-%d"	/* for mtdparts= partitioning */


static struct map_info sbc8240_map[2] = {
	{
		.name           = "sbc8240 Flash Bank #0",
		.size           = WINDOW_SIZE0,
		.bankwidth       = BUSWIDTH0,
	},
	{
		.name           = "sbc8240 Flash Bank #1",
		.size           = WINDOW_SIZE1,
		.bankwidth       = BUSWIDTH1,
	}
};

#define NUM_FLASH_BANKS	ARRAY_SIZE(sbc8240_map)

/*
 * The following defines the partition layout of SBC8240 boards.
 *
 * See include/linux/mtd/partitions.h for definition of the
 * mtd_partition structure.
 *
 * The *_max_flash_size is the maximum possible mapped flash size
 * which is not necessarily the actual flash size. It must correspond
 * to the value specified in the mapping definition defined by the
 * "struct map_desc *_io_desc" for the corresponding machine.
 */

#ifdef CONFIG_MTD_PARTITIONS

static struct mtd_partition sbc8240_uboot_partitions [] = {
	/* Bank 0 */
	{
		.name =	"U-boot",			/* U-Boot Firmware	*/
		.offset =	0,
		.size =	0x00070000,			/*  7 x 64 KiB sectors 	*/
		.mask_flags = MTD_WRITEABLE,		/*  force read-only	*/
	},
	{
		.name =	"environment",			/* U-Boot environment	*/
		.offset =	0x00070000,
		.size =	0x00010000,			/*  1 x 64 KiB sector	*/
	},
};

static struct mtd_partition sbc8240_fs_partitions [] = {
	{
		.name =	"jffs",				/* JFFS  filesystem	*/
		.offset =	0,
		.size =	0x003C0000,			/*  4 * 15 * 64KiB	*/
	},
	{
		.name =	"tmp32",
		.offset =	0x003C0000,
		.size =	0x00020000,			/*  4 * 32KiB		*/
	},
	{
		.name =	"tmp8a",
		.offset =	0x003E0000,
		.size =	0x00008000,			/*  4 * 8KiB		*/
	},
	{
		.name =	"tmp8b",
		.offset =	0x003E8000,
		.size =	0x00008000,			/*  4 * 8KiB		*/
	},
	{
		.name =	"tmp16",
		.offset =	0x003F0000,
		.size =	0x00010000,			/*  4 * 16KiB		*/
	}
};

/* trivial struct to describe partition information */
struct mtd_part_def
{
	int nums;
	unsigned char *type;
	struct mtd_partition* mtd_part;
};

static struct mtd_info *sbc8240_mtd[NUM_FLASH_BANKS];
static struct mtd_part_def sbc8240_part_banks[NUM_FLASH_BANKS];


#endif	/* CONFIG_MTD_PARTITIONS */


int __init init_sbc8240_mtd (void)
{
	static struct _cjs {
		u_long addr;
		u_long size;
	} pt[NUM_FLASH_BANKS] = {
		{
			.addr = WINDOW_ADDR0,
			.size = WINDOW_SIZE0
		},
		{
			.addr = WINDOW_ADDR1,
			.size = WINDOW_SIZE1
		},
	};

	int devicesfound = 0;
	int i,j;

	for (i = 0; i < NUM_FLASH_BANKS; i++) {
		printk (KERN_NOTICE MSG_PREFIX
			"Probing 0x%08lx at 0x%08lx\n", pt[i].size, pt[i].addr);

		sbc8240_map[i].map_priv_1 =
			(unsigned long) ioremap (pt[i].addr, pt[i].size);
		if (!sbc8240_map[i].map_priv_1) {
			printk (MSG_PREFIX "failed to ioremap\n");
			for (j = 0; j < i; j++) {
				iounmap((void *) sbc8240_map[j].map_priv_1);
				sbc8240_map[j].map_priv_1 = 0;
			}
			return -EIO;
		}
		simple_map_init(&sbc8240_mtd[i]);

		sbc8240_mtd[i] = do_map_probe("jedec_probe", &sbc8240_map[i]);

		if (sbc8240_mtd[i]) {
			sbc8240_mtd[i]->module = THIS_MODULE;
			devicesfound++;
		} else {
			if (sbc8240_map[i].map_priv_1) {
				iounmap((void *) sbc8240_map[i].map_priv_1);
				sbc8240_map[i].map_priv_1 = 0;
			}
		}
	}

	if (!devicesfound) {
		printk(KERN_NOTICE MSG_PREFIX
		       "No suppported flash chips found!\n");
		return -ENXIO;
	}

#ifdef CONFIG_MTD_PARTITIONS
	sbc8240_part_banks[0].mtd_part   = sbc8240_uboot_partitions;
	sbc8240_part_banks[0].type       = "static image";
	sbc8240_part_banks[0].nums       = ARRAY_SIZE(sbc8240_uboot_partitions);
	sbc8240_part_banks[1].mtd_part   = sbc8240_fs_partitions;
	sbc8240_part_banks[1].type       = "static file system";
	sbc8240_part_banks[1].nums       = ARRAY_SIZE(sbc8240_fs_partitions);

	for (i = 0; i < NUM_FLASH_BANKS; i++) {

		if (!sbc8240_mtd[i]) continue;
		if (sbc8240_part_banks[i].nums == 0) {
			printk (KERN_NOTICE MSG_PREFIX
				"No partition info available, registering whole device\n");
			add_mtd_device(sbc8240_mtd[i]);
		} else {
			printk (KERN_NOTICE MSG_PREFIX
				"Using %s partition definition\n", sbc8240_part_banks[i].mtd_part->name);
			add_mtd_partitions (sbc8240_mtd[i],
					    sbc8240_part_banks[i].mtd_part,
					    sbc8240_part_banks[i].nums);
		}
	}
#else
	printk(KERN_NOTICE MSG_PREFIX
	       "Registering %d flash banks at once\n", devicesfound);

	for (i = 0; i < devicesfound; i++) {
		add_mtd_device(sbc8240_mtd[i]);
	}
#endif	/* CONFIG_MTD_PARTITIONS */

	return devicesfound == 0 ? -ENXIO : 0;
}

static void __exit cleanup_sbc8240_mtd (void)
{
	int i;

	for (i = 0; i < NUM_FLASH_BANKS; i++) {
		if (sbc8240_mtd[i]) {
			del_mtd_device (sbc8240_mtd[i]);
			map_destroy (sbc8240_mtd[i]);
		}
		if (sbc8240_map[i].map_priv_1) {
			iounmap ((void *) sbc8240_map[i].map_priv_1);
			sbc8240_map[i].map_priv_1 = 0;
		}
	}
}

module_init (init_sbc8240_mtd);
module_exit (cleanup_sbc8240_mtd);

MODULE_LICENSE ("GPL");
MODULE_AUTHOR ("Carolyn Smith <carolyn.smith@tektronix.com>");
MODULE_DESCRIPTION ("MTD map driver for SBC8240 boards");