source: SVN/rincon/u-boot/board/m501sk/eeprom.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 22 months ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 2.5 KB
Line 
1/*
2 * Add by Alan Lu, 07-29-2005
3 * For ATMEL AT24C16 EEPROM
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24#include <common.h>
25#include <i2c.h>
26#ifdef CFG_EEPROM_AT24C16
27#undef DEBUG
28
29void eeprom_init(void)
30{
31#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
32        i2c_init(CFG_I2C_SPEED, CFG_I2C_SLAVE);
33#endif
34}
35
36int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer,
37                        unsigned cnt)
38{
39        int page, count = 0, i = 0;
40        page = offset / 0x100;
41        i = offset % 0x100;
42
43        while (count < cnt) {
44                if (i2c_read(dev_addr|page, i++, 1, buffer+count++, 1) != 0)
45                        return 1;
46                if (i > 0xff) {
47                        page++;
48                        i = 0;
49                }
50        }
51
52        return 0;
53}
54
55/*
56 * for CFG_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
57 *   0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
58 *
59 * for CFG_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
60 *   0x00000nxx for EEPROM address selectors and page number at n.
61 */
62int eeprom_write(unsigned dev_addr, unsigned offset, uchar *buffer,
63                        unsigned cnt)
64{
65        int page, i = 0, count = 0;
66
67        page = offset / 0x100;
68        i = offset % 0x100;
69
70        while (count < cnt) {
71                if (i2c_write(dev_addr|page, i++, 1, buffer+count++, 1) != 0)
72                        return 1;
73                if (i > 0xff) {
74                        page++;
75                        i = 0;
76                }
77        }
78
79#if defined(CFG_EEPROM_PAGE_WRITE_DELAY_MS)
80        udelay(CFG_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
81#endif
82
83        return 0;
84}
85
86#ifndef CONFIG_SPI
87int eeprom_probe(unsigned dev_addr, unsigned offset)
88{
89        unsigned char chip;
90
91        /* Probe the chip address */
92#if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
93        chip = offset >> 8; /* block number */
94#else
95        chip = offset >> 16; /* block number */
96#endif /* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */
97
98        chip |= dev_addr; /* insert device address */
99        return (i2c_probe(chip));
100}
101#endif
102#endif
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