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102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*
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* Add by Alan Lu, 07-29-2005
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* For ATMEL AT24C16 EEPROM
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <i2c.h>
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#ifdef CONFIG_SYS_EEPROM_AT24C16
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#undef DEBUG
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void eeprom_init(void)
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{
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#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
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i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
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#endif
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}
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int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer,
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unsigned cnt)
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{
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int page, count = 0, i = 0;
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page = offset / 0x100;
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i = offset % 0x100;
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while (count < cnt) {
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if (i2c_read(dev_addr|page, i++, 1, buffer+count++, 1) != 0)
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return 1;
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if (i > 0xff) {
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page++;
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i = 0;
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}
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}
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return 0;
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}
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/*
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* for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
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* 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
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*
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* for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
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* 0x00000nxx for EEPROM address selectors and page number at n.
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*/
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int eeprom_write(unsigned dev_addr, unsigned offset, uchar *buffer,
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unsigned cnt)
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{
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int page, i = 0, count = 0;
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page = offset / 0x100;
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i = offset % 0x100;
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while (count < cnt) {
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if (i2c_write(dev_addr|page, i++, 1, buffer+count++, 1) != 0)
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return 1;
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if (i > 0xff) {
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page++;
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i = 0;
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}
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}
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#if defined(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS)
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udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
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#endif
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return 0;
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}
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#ifndef CONFIG_SPI
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int eeprom_probe(unsigned dev_addr, unsigned offset)
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{
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unsigned char chip;
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/* Probe the chip address */
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#if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
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chip = offset >> 8; /* block number */
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#else
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chip = offset >> 16; /* block number */
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#endif /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */
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chip |= dev_addr; /* insert device address */
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return (i2c_probe(chip));
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}
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#endif
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#endif
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