ppc4xx: Add support for 2nd I2C EEPROM on lwmon5 board

This patch adds support for the 2nd EEPROM (AT24C128) on the lwmon5
board. Now the "eeprom" command can be used to read/write from/to this
device. Additionally a new command was added "eepromwp" to en-/disable
the write-protect of this 2nd EEPROM.

The 1st EEPROM is not affected by this write-protect command.

Signed-off-by: Stefan Roese <sr@denx.de>

board/lwmon5/lwmon5.c

@@ -19,6 +19,7 @@
  */
 
 #include <common.h>
+#include <command.h>
 #include <ppc440.h>
 #include <asm/processor.h>
 #include <asm/gpio.h>
@@ -527,3 +528,29 @@ void hw_watchdog_reset(void)
 	val = gpio_read_out_bit(CFG_GPIO_WATCHDOG) == 0 ? 1 : 0;
 	gpio_write_bit(CFG_GPIO_WATCHDOG, val);
 }
+
+int do_eeprom_wp(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	if (argc < 2) {
+		printf("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	}
+
+	if ((strcmp(argv[1], "on") == 0)) {
+		gpio_write_bit(CFG_GPIO_EEPROM_EXT_WP, 1);
+	} else if ((strcmp(argv[1], "off") == 0)) {
+		gpio_write_bit(CFG_GPIO_EEPROM_EXT_WP, 0);
+	} else {
+		printf("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	}
+
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	eepromwp,	2,	0,	do_eeprom_wp,
+	"eepromwp- eeprom write protect off/on\n",
+	"<on|off> - enable (on) or disable (off) I2C EEPROM write protect\n"
+);

include/configs/lwmon5.h

@@ -161,15 +161,16 @@
  *----------------------------------------------------------------------*/
 #define CONFIG_HARD_I2C		1		/* I2C with hardware support	*/
 #undef	CONFIG_SOFT_I2C				/* I2C bit-banged		*/
-#define CFG_I2C_SPEED		400000		/* I2C speed and slave address	*/
+#define CFG_I2C_SPEED		100000		/* I2C speed and slave address	*/
 #define CFG_I2C_SLAVE		0x7F
 
-#define CFG_I2C_MULTI_EEPROMS
-#define CFG_I2C_EEPROM_ADDR	(0xa8>>1)
-#define CFG_I2C_EEPROM_ADDR_LEN 1
+#define CFG_I2C_EEPROM_ADDR	0x53	/* EEPROM AT24C128		*/
+#define CFG_I2C_EEPROM_ADDR_LEN 2	/* Bytes of address		*/
+#define CFG_EEPROM_PAGE_WRITE_BITS 6	/* The Atmel AT24C128 has	*/
+					/* 64 byte page write mode using*/
+					/* last 6 bits of the address	*/
+#define CFG_EEPROM_PAGE_WRITE_DELAY_MS	10   /* and takes up to 10 msec */
 #define CFG_EEPROM_PAGE_WRITE_ENABLE
-#define CFG_EEPROM_PAGE_WRITE_BITS 3
-#define CFG_EEPROM_PAGE_WRITE_DELAY_MS 10
 
 #define CONFIG_RTC_PCF8563	1		/* enable Philips PCF8563 RTC	*/
 #define CFG_I2C_RTC_ADDR	0x51		/* Philips PCF8563 RTC address	*/
@@ -397,6 +398,8 @@
 #define CFG_GPIO_PHY1_RST	12
 #define CFG_GPIO_FLASH_WP	14
 #define CFG_GPIO_PHY0_RST	22
+#define CFG_GPIO_EEPROM_EXT_WP	55
+#define CFG_GPIO_EEPROM_INT_WP	57
 #define CFG_GPIO_WATCHDOG	58
 #define CFG_GPIO_LIME_S		59
 #define CFG_GPIO_LIME_RST	60