/* * Add by Alan Lu, 07-29-2005 * For ATMEL AT24C16 EEPROM * * 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 <i2c.h> #ifdef CFG_EEPROM_AT24C16 #undef DEBUG void eeprom_init(void) { #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C) i2c_init(CFG_I2C_SPEED, CFG_I2C_SLAVE); #endif } int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt) { int page, count = 0, i = 0; page = offset / 0x100; i = offset % 0x100; while (count < cnt) { if (i2c_read(dev_addr|page, i++, 1, buffer+count++, 1) != 0) return 1; if (i > 0xff) { page++; i = 0; } } return 0; } /* * for CFG_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is * 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM. * * for CFG_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is * 0x00000nxx for EEPROM address selectors and page number at n. */ int eeprom_write(unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt) { int page, i = 0, count = 0; page = offset / 0x100; i = offset % 0x100; while (count < cnt) { if (i2c_write(dev_addr|page, i++, 1, buffer+count++, 1) != 0) return 1; if (i > 0xff) { page++; i = 0; } } #if defined(CFG_EEPROM_PAGE_WRITE_DELAY_MS) udelay(CFG_EEPROM_PAGE_WRITE_DELAY_MS * 1000); #endif return 0; } #ifndef CONFIG_SPI int eeprom_probe(unsigned dev_addr, unsigned offset) { unsigned char chip; /* Probe the chip address */ #if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X) chip = offset >> 8; /* block number */ #else chip = offset >> 16; /* block number */ #endif /* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */ chip |= dev_addr; /* insert device address */ return (i2c_probe(chip)); } #endif #endif