summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/tqm8xxl.c
blob: 995e9991cb8dfa0ed3858b41a075ad3212c20af3 (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
/*
 * Handle mapping of the flash memory access routines 
 * on TQM8xxL based devices.
 *
 * $Id: tqm8xxl.c,v 1.13 2004/10/20 22:21:53 dwmw2 Exp $
 *
 * based on rpxlite.c
 *
 * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
 *
 * This code is GPLed
 * 
 */

/*
 * According to TQM8xxL hardware manual, TQM8xxL series have
 * following flash memory organisations:
 *	| capacity |	| chip type |	| bank0 |	| bank1 |
 *	    2MiB	   512Kx16	  2MiB		   0
 *	    4MiB	   1Mx16	  4MiB		   0
 *	    8MiB	   1Mx16	  4MiB		   4MiB
 * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at 
 * kernel configuration.
 */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/io.h>

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

#define FLASH_ADDR 0x40000000
#define FLASH_SIZE 0x00800000
#define FLASH_BANK_MAX 4

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

//static struct mtd_info *mymtd;
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 void __iomem *start_scan_addr;

/*
 * Here are partition information for all known TQM8xxL series devices.
 * 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
/* Currently, TQM8xxL has upto 8MiB flash */
static unsigned long tqm8xxl_max_flash_size = 0x00800000;

/* partition definition for first flash bank
 * (cf. "drivers/char/flash_config.c")
 */
static struct mtd_partition tqm8xxl_partitions[] = {
	{
	  .name = "ppcboot",
	  .offset = 0x00000000,
	  .size = 0x00020000,           /* 128KB           */
	  .mask_flags = MTD_WRITEABLE,  /* force read-only */
	},
	{
	  .name = "kernel",             /* default kernel image */
	  .offset = 0x00020000,
	  .size = 0x000e0000,
	  .mask_flags = MTD_WRITEABLE,  /* force read-only */
	},
	{
	  .name = "user",
	  .offset = 0x00100000,
	  .size = 0x00100000,
	},
	{
	  .name = "initrd",
	  .offset = 0x00200000,
	  .size = 0x00200000,
	}
};
/* partition definition for second flash bank */
static struct mtd_partition tqm8xxl_fs_partitions[] = {
	{
	  .name = "cramfs",
	  .offset = 0x00000000,
	  .size = 0x00200000,
	},
	{
	  .name = "jffs",
	  .offset = 0x00200000,
	  .size = 0x00200000,
	  //.size = MTDPART_SIZ_FULL,
	}
};
#endif

int __init init_tqm_mtd(void)
{
	int idx = 0, ret = 0;
	unsigned long flash_addr, flash_size, mtd_size = 0;
	/* pointer to TQM8xxL board info data */
	bd_t *bd = (bd_t *)__res;

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

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

	for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
		if(mtd_size >= flash_size)
			break;
		
		printk(KERN_INFO "%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;
			/* FIXME: What if some MTD devices were probed already? */
			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) {
			ret = -ENOMEM;
			/* FIXME: What if some MTD devices were probed already? */
			goto error_mem;
		}
		sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);

		map_banks[idx]->size = flash_size;
		map_banks[idx]->bankwidth = 4;

		simple_map_init(map_banks[idx]);

		map_banks[idx]->virt = start_scan_addr;
		map_banks[idx]->phys = flash_addr;
		/* FIXME: This looks utterly bogus, but I'm trying to
		   preserve the behaviour of the original (shown here)...

		map_banks[idx]->map_priv_1 =
		start_scan_addr + ((idx > 0) ?
		(mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
		*/

		if (idx && mtd_banks[idx-1]) {
			map_banks[idx]->virt += mtd_banks[idx-1]->size;
			map_banks[idx]->phys += mtd_banks[idx-1]->size;
		}

		//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++;

			printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks, 
			mtd_banks[idx]->name, mtd_banks[idx]->size);
		}
	}

	/* no supported flash chips found */
	if (!num_banks) {
		printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
		ret = -ENXIO;
		goto error_mem;
	}

#ifdef CONFIG_MTD_PARTITIONS
	/*
	 * Select Static partition definitions
	 */
	part_banks[0].mtd_part = tqm8xxl_partitions;
	part_banks[0].type = "Static image";
	part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);

	part_banks[1].mtd_part = tqm8xxl_fs_partitions;
	part_banks[1].type = "Static file system";
	part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);

	for(idx = 0; idx < num_banks ; idx++) {
		if (part_banks[idx].nums == 0) {
			printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
			add_mtd_device(mtd_banks[idx]);
		} else {
			printk(KERN_NOTICE "TQM flash%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
	printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
	for(idx = 0 ; idx < num_banks ; idx++)
		add_mtd_device(mtd_banks[idx]);
#endif
	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;
		}
	}
error:
	iounmap(start_scan_addr);
	return ret;
}

static void __exit cleanup_tqm_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(start_scan_addr);
		start_scan_addr = 0;
	}
}

module_init(init_tqm_mtd);
module_exit(cleanup_tqm_mtd);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");
OpenPOWER on IntegriCloud