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-rw-r--r--board/m501sk/eeprom.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/board/m501sk/eeprom.c b/board/m501sk/eeprom.c
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+++ b/board/m501sk/eeprom.c
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+/*
+ * 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