summaryrefslogtreecommitdiff
path: root/drivers/mtd/nand/nand.c
blob: bca51ffbf206b62abf97f4db76c651cbe20d04af (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
// SPDX-License-Identifier: GPL-2.0
/*
 * (C) Copyright 2005
 * 2N Telekomunikace, a.s. <www.2n.cz>
 * Ladislav Michl <michl@2n.cz>
 */

#include <common.h>
#include <nand.h>
#include <errno.h>
#include <linux/mtd/concat.h>

#ifndef CONFIG_SYS_NAND_BASE_LIST
#define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
#endif

int nand_curr_device = -1;

static struct mtd_info *nand_info[CONFIG_SYS_MAX_NAND_DEVICE];

#ifndef CONFIG_SYS_NAND_SELF_INIT
static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
static ulong base_address[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIST;
#endif

static char dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];

static unsigned long total_nand_size; /* in kiB */

struct mtd_info *get_nand_dev_by_index(int dev)
{
	if (dev < 0 || dev >= CONFIG_SYS_MAX_NAND_DEVICE || !nand_info[dev] ||
	    !nand_info[dev]->name)
		return NULL;

	return nand_info[dev];
}

int nand_mtd_to_devnum(struct mtd_info *mtd)
{
	int i;

	for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
		if (mtd && get_nand_dev_by_index(i) == mtd)
			return i;
	}

	return -ENODEV;
}

/* Register an initialized NAND mtd device with the U-Boot NAND command. */
int nand_register(int devnum, struct mtd_info *mtd)
{
	if (devnum >= CONFIG_SYS_MAX_NAND_DEVICE)
		return -EINVAL;

	nand_info[devnum] = mtd;

	sprintf(dev_name[devnum], "nand%d", devnum);
	mtd->name = dev_name[devnum];

#ifdef CONFIG_MTD_DEVICE
	/*
	 * Add MTD device so that we can reference it later
	 * via the mtdcore infrastructure (e.g. ubi).
	 */
	add_mtd_device(mtd);
#endif

	total_nand_size += mtd->size / 1024;

	if (nand_curr_device == -1)
		nand_curr_device = devnum;

	return 0;
}

#ifndef CONFIG_SYS_NAND_SELF_INIT
static void nand_init_chip(int i)
{
	struct nand_chip *nand = &nand_chip[i];
	struct mtd_info *mtd = nand_to_mtd(nand);
	ulong base_addr = base_address[i];
	int maxchips = CONFIG_SYS_NAND_MAX_CHIPS;

	if (maxchips < 1)
		maxchips = 1;

	nand->IO_ADDR_R = nand->IO_ADDR_W = (void  __iomem *)base_addr;

	if (board_nand_init(nand))
		return;

	if (nand_scan(mtd, maxchips))
		return;

	nand_register(i, mtd);
}
#endif

#ifdef CONFIG_MTD_CONCAT
static void create_mtd_concat(void)
{
	struct mtd_info *nand_info_list[CONFIG_SYS_MAX_NAND_DEVICE];
	int nand_devices_found = 0;
	int i;

	for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
		struct mtd_info *mtd = get_nand_dev_by_index(i);
		if (mtd != NULL) {
			nand_info_list[nand_devices_found] = mtd;
			nand_devices_found++;
		}
	}
	if (nand_devices_found > 1) {
		struct mtd_info *mtd;
		char c_mtd_name[16];

		/*
		 * We detected multiple devices. Concatenate them together.
		 */
		sprintf(c_mtd_name, "nand%d", nand_devices_found);
		mtd = mtd_concat_create(nand_info_list, nand_devices_found,
					c_mtd_name);

		if (mtd == NULL)
			return;

		nand_register(nand_devices_found, mtd);
	}

	return;
}
#else
static void create_mtd_concat(void)
{
}
#endif

unsigned long nand_size(void)
{
	return total_nand_size;
}

void nand_init(void)
{
	static int initialized;

	/*
	 * Avoid initializing NAND Flash multiple times,
	 * otherwise it will calculate a wrong total size.
	 */
	if (initialized)
		return;
	initialized = 1;

#ifdef CONFIG_SYS_NAND_SELF_INIT
	board_nand_init();
#else
	int i;

	for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
		nand_init_chip(i);
#endif

#ifdef CONFIG_SYS_NAND_SELECT_DEVICE
	/*
	 * Select the chip in the board/cpu specific driver
	 */
	board_nand_select_device(mtd_to_nand(get_nand_dev_by_index(nand_curr_device)),
				 nand_curr_device);
#endif

	create_mtd_concat();
}