summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/onenand/onenand_spl.c
blob: 50eaa71882cf19accbb1d60024350879e01b568b (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
/*
 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
 *
 * Based on code:
 *	Copyright (C) 2005-2009 Samsung Electronics
 *	Kyungmin Park <kyungmin.park@samsung.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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
 */

#include <common.h>
#include <asm/io.h>
#include <linux/mtd/onenand_regs.h>
#include <onenand_uboot.h>

/*
 * Device geometry:
 * - 2048b page, 128k erase block.
 * - 4096b page, 256k erase block.
 */
enum onenand_spl_pagesize {
	PAGE_2K = 2048,
	PAGE_4K = 4096,
};

#define ONENAND_PAGES_PER_BLOCK			64
#define onenand_block_address(block)		(block)
#define onenand_sector_address(page)		(page << 2)
#define onenand_buffer_address()		((1 << 3) << 8)
#define onenand_bufferram_address(block)	(0)

static inline uint16_t onenand_readw(uint32_t addr)
{
	return readw(CONFIG_SYS_ONENAND_BASE + addr);
}

static inline void onenand_writew(uint16_t value, uint32_t addr)
{
	writew(value, CONFIG_SYS_ONENAND_BASE + addr);
}

static enum onenand_spl_pagesize onenand_spl_get_geometry(void)
{
	uint32_t dev_id, density;

	if (!onenand_readw(ONENAND_REG_TECHNOLOGY)) {
		dev_id = onenand_readw(ONENAND_REG_DEVICE_ID);
		density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
		density &= ONENAND_DEVICE_DENSITY_MASK;

		if (density < ONENAND_DEVICE_DENSITY_4Gb)
			return PAGE_2K;

		if (dev_id & ONENAND_DEVICE_IS_DDP)
			return PAGE_2K;
	}

	return PAGE_4K;
}

static int onenand_spl_read_page(uint32_t block, uint32_t page, uint32_t *buf,
					enum onenand_spl_pagesize pagesize)
{
	const uint32_t addr = CONFIG_SYS_ONENAND_BASE + ONENAND_DATARAM;
	uint32_t offset;

	onenand_writew(onenand_block_address(block),
			ONENAND_REG_START_ADDRESS1);

	onenand_writew(onenand_bufferram_address(block),
			ONENAND_REG_START_ADDRESS2);

	onenand_writew(onenand_sector_address(page),
			ONENAND_REG_START_ADDRESS8);

	onenand_writew(onenand_buffer_address(),
			ONENAND_REG_START_BUFFER);

	onenand_writew(ONENAND_INT_CLEAR, ONENAND_REG_INTERRUPT);

	onenand_writew(ONENAND_CMD_READ, ONENAND_REG_COMMAND);

	while (!(onenand_readw(ONENAND_REG_INTERRUPT) & ONENAND_INT_READ))
		continue;

	/* Check for invalid block mark */
	if (page < 2 && (onenand_readw(ONENAND_SPARERAM) != 0xffff))
		return 1;

	for (offset = 0; offset < pagesize; offset += 4)
		buf[offset / 4] = readl(addr + offset);

	return 0;
}

void onenand_spl_load_image(uint32_t offs, uint32_t size, void *dst)
{
	uint32_t *addr = (uint32_t *)dst;
	uint32_t total_pages;
	uint32_t block;
	uint32_t page, rpage;
	enum onenand_spl_pagesize pagesize;
	int ret;

	pagesize = onenand_spl_get_geometry();

	/*
	 * The page can be either 2k or 4k, avoid using DIV_ROUND_UP to avoid
	 * pulling further unwanted functions into the SPL.
	 */
	if (pagesize == 2048) {
		total_pages = DIV_ROUND_UP(size, 2048);
		page = offs / 2048;
	} else {
		total_pages = DIV_ROUND_UP(size, 4096);
		page = offs / 4096;
	}

	for (; page <= total_pages; page++) {
		block = page / ONENAND_PAGES_PER_BLOCK;
		rpage = page & (ONENAND_PAGES_PER_BLOCK - 1);
		ret = onenand_spl_read_page(block, rpage, addr, pagesize);
		if (ret) {
			total_pages += ONENAND_PAGES_PER_BLOCK;
			page += ONENAND_PAGES_PER_BLOCK - 1;
		} else {
			addr += pagesize / 4;
		}
	}
}
OpenPOWER on IntegriCloud