2 * Add by Alan Lu, 07-29-2005
3 * For ATMEL AT24C16 EEPROM
5 * See file CREDITS for list of people who contributed to this
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.
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.
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,
26 #ifdef CONFIG_SYS_EEPROM_AT24C16
29 void eeprom_init(void)
31 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
32 i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
36 int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer,
39 int page, count = 0, i = 0;
40 page = offset / 0x100;
44 if (i2c_read(dev_addr|page, i++, 1, buffer+count++, 1) != 0)
56 * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
57 * 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
59 * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
60 * 0x00000nxx for EEPROM address selectors and page number at n.
62 int eeprom_write(unsigned dev_addr, unsigned offset, uchar *buffer,
65 int page, i = 0, count = 0;
67 page = offset / 0x100;
71 if (i2c_write(dev_addr|page, i++, 1, buffer+count++, 1) != 0)
79 #if defined(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS)
80 udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
87 int eeprom_probe(unsigned dev_addr, unsigned offset)
91 /* Probe the chip address */
92 #if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
93 chip = offset >> 8; /* block number */
95 chip = offset >> 16; /* block number */
96 #endif /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */
98 chip |= dev_addr; /* insert device address */
99 return (i2c_probe(chip));