summaryrefslogtreecommitdiff
path: root/drivers/mtd/maps/tqm834x.c
blob: c7ae9a515c1aa1a1d3161933db1e4cae904a9c07 (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
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
278
279
280
281
282
283
284
285
286
287
288
289
290
291
/*
 * drivers/mtd/maps/tqm834x.c
 *
 * MTD mapping driver for TQM834x boards
 *
 * Copyright 2005 Wolfgang Denk, DENX Software Engineering, <wd@denx.de>.
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2.  This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 *
 */

#include <linux/config.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <asm/ppcboot.h>

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

#define FLASH_BANK_MAX	2

extern unsigned char __res[];

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

static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
static struct map_info* map_banks[FLASH_BANK_MAX];
static struct mtd_part_def part_banks[FLASH_BANK_MAX];

static unsigned long num_banks;
static unsigned long start_scan_addr;

#ifdef CONFIG_MTD_PARTITIONS
/*
 * The following defines the partition layout of TQM834x boards.
 *
 * See include/linux/mtd/partitions.h for definition of the
 * mtd_partition structure.
 *
 * Assume minimal initial size of 4 MiB per bank, will be updated
 * later in init_tqm834x_mtd() routine.
 */

/* Partition definition for the first flash bank which is always present. */
static struct mtd_partition tqm834x_partitions_bank1[] = {
	{
		.name	= "u-boot",		/* u-boot firmware	*/
		.offset	= 0x00000000,
		.size	= 0x00040000,		/* 256 KiB		*/
		/*mask_flags: MTD_WRITEABLE,	 * force read-only	*/
	},
	{
		.name	= "env",		/* u-boot environment	*/
		.offset	= 0x00040000,
		.size	= 0x00020000,		/* 128 KiB		*/
		/*mask_flags: MTD_WRITEABLE,	 * force read-only	*/
	},
	{
		.name	= "kernel",		/* linux kernel image	*/
		.offset	= 0x00060000,
		.size	= 0x00100000,		/* 1 MiB		*/
		/*mask_flags: MTD_WRITEABLE,	 * force read-only	*/
	},
	{
		.name	= "initrd",		/* ramdisk image	*/
		.offset	= 0x00160000,
		.size	= 0x00200000,		/* 2 MiB		*/
	},
	{
		.name	= "user",		/* user data		*/
		.offset	= 0x00360000,
		.size	= 0x000a0000,		/* remaining space	*/
		/* NOTE: this parttion size is re-calcated in		*/
		/* init_tqm834x_mtd() to cover actual remaining space.	*/
	},
};

/* Partition definition for the second flash bank which may be present on some
 * TQM834x boards.
 */
static struct mtd_partition tqm834x_partitions_bank2[] = {
	{
		.name	= "jffs2",		/* jffs2 filesystem	*/
		.offset	= 0x00000000,
		.size	= 0x00400000,		/* whole device		*/
		/* NOTE: this parttion size is re-calcated in		*/
		/* init_tqm834x_mtd() to cover actual device size.	*/
	},
};

#endif	/* CONFIG_MTD_PARTITIONS */

static int __init init_tqm834x_mtd(void)
{
	int idx = 0, ret = 0;
	unsigned long flash_addr, flash_size, mtd_size = 0;

	/* pointer to TQM834x board info data */
	bd_t *bd = (bd_t *)__res;
#ifdef CONFIG_MTD_CMDLINE_PARTS
	int n;
	char mtdid[4];
	const char *part_probes[] = { "cmdlinepart", NULL };
#endif

	flash_addr = bd->bi_flashstart;
	flash_size = bd->bi_flashsize;

	/* request maximum flash size address space */
	start_scan_addr = (unsigned long)ioremap(flash_addr, flash_size);
	if (!start_scan_addr) {
		printk("%s: Failed to ioremap address: 0x%lx\n",
		       __FUNCTION__, flash_addr);
		return -EIO;
	}

	for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
		if (mtd_size >= flash_size)
			break;

		pr_debug("%s: chip probing count %d\n", __FUNCTION__, idx);

		map_banks[idx] =
			(struct map_info *)kmalloc(sizeof(struct map_info),
						   GFP_KERNEL);
		if (map_banks[idx] == NULL) {
			ret = -ENOMEM;
			goto error_mem;
		}
		memset((void *)map_banks[idx], 0, sizeof(struct map_info));
		map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
		if (map_banks[idx]->name == NULL) {
			ret = -ENOMEM;
			goto error_mem;
		}
		memset((void *)map_banks[idx]->name, 0, 16);

		sprintf(map_banks[idx]->name, "TQM834x-%d", idx);
		map_banks[idx]->size = flash_size;
		map_banks[idx]->bankwidth = 4;

		simple_map_init(map_banks[idx]);

		map_banks[idx]->virt = (void __iomem *)
			(start_scan_addr + ((idx > 0) ?
			(mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0));
		map_banks[idx]->phys =
			flash_addr + ((idx > 0) ?
			(mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);

		/* start to probe flash chips */
		mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
		if (mtd_banks[idx]) {
			mtd_banks[idx]->owner = THIS_MODULE;
			mtd_size += mtd_banks[idx]->size;
			num_banks++;
			pr_debug("%s: bank %ld, name: %s, size: %d bytes \n",
				 __FUNCTION__, num_banks,
				 mtd_banks[idx]->name, mtd_banks[idx]->size);
		}
	}

	/* no supported flash chips found */
	if (!num_banks) {
		printk("TQM834x: No supported flash chips found!\n");
		ret = -ENXIO;
		goto error_mem;
	}

#ifdef CONFIG_MTD_PARTITIONS
	/*
	 * Select static partition definitions
	 */
	n = ARRAY_SIZE(tqm834x_partitions_bank1);
	part_banks[0].mtd_part	= tqm834x_partitions_bank1;
	part_banks[0].type	= "static image bank1";
	part_banks[0].nums	= n;

	/* update last partition size to cover actual remaining space */
	tqm834x_partitions_bank1[n - 1].size =
		mtd_banks[0]->size -
		tqm834x_partitions_bank1[n - 1].offset;

	/* check if we have second bank? */
	if (num_banks == 2) {
		n = ARRAY_SIZE(tqm834x_partitions_bank2);
		part_banks[1].mtd_part	= tqm834x_partitions_bank2;
		part_banks[1].type	= "static image bank2";
		part_banks[1].nums	= n;

		/* update last partition size to cover actual remaining space */
		tqm834x_partitions_bank2[n - 1].size =
			mtd_banks[1]->size -
			tqm834x_partitions_bank2[n - 1].offset;
	}

	for(idx = 0; idx < num_banks ; idx++) {
#ifdef CONFIG_MTD_CMDLINE_PARTS
		sprintf(mtdid, "%d", idx);
		n = parse_mtd_partitions(mtd_banks[idx],
					 part_probes,
					 &part_banks[idx].mtd_part,
					 0);
		pr_debug("%s: %d command line partitions on bank %s\n",
			 __FUNCTION__, n, mtdid);
		if (n > 0) {
			part_banks[idx].type = "command line";
			part_banks[idx].nums = n;
		}
#endif	/* CONFIG_MTD_CMDLINE_PARTS */
		if (part_banks[idx].nums == 0) {
			printk(KERN_NOTICE
			       "TQM834x flash bank %d: no partition info "
			       "available, registering whole device\n", idx);
			add_mtd_device(mtd_banks[idx]);
		} else {
			printk(KERN_NOTICE
			       "TQM834x flash bank %d: Using %s partition "
			       "definition\n", idx, part_banks[idx].type);
			add_mtd_partitions(mtd_banks[idx],
					   part_banks[idx].mtd_part,
					   part_banks[idx].nums);
		}
	}
#else	/* ! CONFIG_MTD_PARTITIONS */
	printk(KERN_NOTICE "TQM834x flash: registering %d flash banks "
			"at once\n", num_banks);

	for(idx = 0 ; idx < num_banks ; idx++)
		add_mtd_device(mtd_banks[idx]);

#endif	/* CONFIG_MTD_PARTITIONS */

	return 0;
error_mem:
	for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
		if (map_banks[idx] != NULL) {
			if (map_banks[idx]->name != NULL) {
				kfree(map_banks[idx]->name);
				map_banks[idx]->name = NULL;
			}
			kfree(map_banks[idx]);
			map_banks[idx] = NULL;
		}
	}

	iounmap((void *)start_scan_addr);

	return ret;
}

static void __exit cleanup_tqm834x_mtd(void)
{
	unsigned int idx = 0;
	for(idx = 0 ; idx < num_banks ; idx++) {
		/* destroy mtd_info previously allocated */
		if (mtd_banks[idx]) {
			del_mtd_partitions(mtd_banks[idx]);
			map_destroy(mtd_banks[idx]);
		}

		/* release map_info not used anymore */
		kfree(map_banks[idx]->name);
		kfree(map_banks[idx]);
	}

	if (start_scan_addr) {
		iounmap((void *)start_scan_addr);
		start_scan_addr = 0;
	}
}

module_init(init_tqm834x_mtd);
module_exit(cleanup_tqm834x_mtd);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Wolfgang Denk <wd@denx.de>");
MODULE_DESCRIPTION("MTD map driver for TQM834x boards");