Add support for reading and writing mac addresses to or from ID EEPROM.

Added code for reading and writing Mac addresses to/from ID EEPROM(0x57).
With attached patch, we can use command "mac/mac read/mac save/"
to read and write EEPROM under u-boot prompt.

U-boot will calculate the checksum of EEPROM while bootup,
if it is right, then u-boot will check whether the mac address
of eTSEC0/1/2/3 is availalbe (non-zero).

If there is mac address availabe in EEPROM, u-boot will use it,
otherewise, u-boot will use the mac address defined in
MPC8641HPCN.h. This matches the requirement to set unique mac address
for each TSEC port.

Signed-off-by: Haiying Wang <haiying.wang@freescale.com>
Signed-off-by: York Sun <yorksun@freescale.com>

2 files changed, 245 insertions, 1 deletions

diff --git a/board/mpc8641hpcn/Makefile b/board/mpc8641hpcn/Makefile
index 060db84..0ebed87 100644
--- a/board/mpc8641hpcn/Makefile
+++ b/board/mpc8641hpcn/Makefile
@@ -25,7 +25,7 @@ include $(TOPDIR)/config.mk
 
 LIB	= lib$(BOARD).a
 
-OBJS	:= $(BOARD).o pixis.o oftree.o
+OBJS	:= $(BOARD).o pixis.o sys_eeprom.o oftree.o
 SOBJS	:= init.o
 
 $(LIB):	$(OBJS) $(SOBJS)
diff --git a/board/mpc8641hpcn/sys_eeprom.c b/board/mpc8641hpcn/sys_eeprom.c
new file mode 100644
index 0000000..733a57f
--- /dev/null
+++ b/board/mpc8641hpcn/sys_eeprom.c
@@ -0,0 +1,244 @@
+/*
+ * Copyright 2006 Freescale Semiconductor
+ * York Sun (yorksun@freescale.com)
+ * Haiying Wang (haiying.wang@freescale.com)
+ *
+ * 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 <command.h>
+#include <i2c.h>
+#include <linux/ctype.h>
+
+#ifdef CFG_ID_EEPROM
+typedef struct {
+	unsigned char id[4];    /* 0x0000 - 0x0003 */
+	unsigned char sn[12];   /* 0x0004 - 0x000F */
+	unsigned char errata[5];/* 0x0010 - 0x0014 */
+	unsigned char date[7];  /* 0x0015 - 0x001a */
+	unsigned char res_1[37];/* 0x001b - 0x003f */
+	unsigned char tab_size; /* 0x0040 */
+	unsigned char tab_flag; /* 0x0041 */
+	unsigned char mac[8][6];/* 0x0042 - 0x0071 */
+	unsigned char res_2[126];/* 0x0072 - 0x00ef */
+	unsigned int  crc;      /* 0x00f0 - 0x00f3 crc32 checksum */
+} EEPROM_data;
+
+static EEPROM_data mac_data;
+
+int mac_show(void)
+{
+	int i;
+	unsigned char ethaddr[8][18];
+
+	printf("ID %c%c%c%c\n", mac_data.id[0],\
+				mac_data.id[1],\
+				mac_data.id[2],\
+				mac_data.id[3]);
+	printf("Errata %c%c%c%c%c\n",   mac_data.errata[0],\
+				mac_data.errata[1],\
+				mac_data.errata[2],\
+				mac_data.errata[3],\
+				mac_data.errata[4]);
+	printf("Date %c%c%c%c%c%c%c\n", mac_data.date[0],\
+				mac_data.date[1],\
+				mac_data.date[2],\
+				mac_data.date[3],\
+				mac_data.date[4],\
+				mac_data.date[5],\
+				mac_data.date[6]);
+	for (i = 0; i < 8; i++) {
+		sprintf(ethaddr[i],"%02x:%02x:%02x:%02x:%02x:%02x",\
+					mac_data.mac[i][0],\
+					mac_data.mac[i][1],\
+					mac_data.mac[i][2],\
+					mac_data.mac[i][3],\
+					mac_data.mac[i][4],\
+					mac_data.mac[i][5]);
+		printf("MAC %d %s\n", i, ethaddr[i]);
+	}
+
+	setenv("ethaddr", ethaddr[0]);
+	setenv("eth1addr", ethaddr[1]);
+	setenv("eth2addr", ethaddr[2]);
+	setenv("eth3addr", ethaddr[3]);
+
+	return 0;
+}
+
+int mac_read(void)
+{
+	int ret,length;
+	unsigned int crc = 0;
+	unsigned char dev = ID_EEPROM_ADDR, *data;
+
+	length = sizeof(EEPROM_data);
+	ret = i2c_read(dev, 0, 1, (unsigned char *)(&mac_data), length);
+	if (ret) {
+		printf("Read failed.\n");
+		return -1;
+	}
+
+	data = (unsigned char *)(&mac_data);
+	printf("Check CRC on reading ...");
+	crc = crc32(crc, data, length-4);
+	if (crc != mac_data.crc) {
+		printf("CRC checksum is invalid, in EEPROM CRC is %x, calculated CRC is %x\n",mac_data.crc,crc);
+		return -1;
+	}
+	else {
+		printf("CRC OK\n");
+		mac_show();
+	}
+	return 0;
+}
+
+int mac_prog(void)
+{
+	int ret, i, length;
+	unsigned int crc = 0;
+	unsigned char dev = ID_EEPROM_ADDR,*ptr;
+	unsigned char * eeprom_data = (unsigned char *)(&mac_data);
+
+	for (i = 0; i < sizeof(mac_data.res_1); i++)
+		mac_data.res_1[i] = 0;
+	for (i = 0;i < sizeof(mac_data.res_2); i++)
+		mac_data.res_2[i] = 0;
+	length = sizeof(EEPROM_data);
+	crc = crc32 (crc, eeprom_data, length-4);
+	mac_data.crc = crc;
+	for (i = 0, ptr = eeprom_data; i < length; i += 8, ptr += 8) {
+		ret = i2c_write(dev, i, 1, ptr, (length-i) <8 ? (length-i) : 8);
+		udelay(5000);           /* 5ms write cycle timing */
+		if (ret)
+			break;
+	}
+	if (ret) {
+		printf("Programming failed.\n");
+		return -1;
+	}
+	else {
+		printf("Programming %d bytes. Reading back ...\n",length);
+		mac_read();
+	}
+	return 0;
+}
+
+int do_mac (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	int i;
+	char cmd = 's';
+	unsigned long long mac_val;
+
+	if(i2c_probe(ID_EEPROM_ADDR) != 0)
+		return -1;
+
+	if(argc>1) {
+		cmd = argv[1][0];
+		switch (cmd) {
+			case 'r':       /* display */
+				mac_read();
+				break;
+			case 's':       /* save */
+				mac_prog();
+				break;
+			case 'i':       /* id */
+				for (i=0; i<4; i++) {
+					mac_data.id[i] = argv[2][i];
+				}
+				break;
+			case 'n':       /* serial number */
+				for (i=0; i<12; i++) {
+					mac_data.sn[i] = argv[2][i];
+				}
+				break;
+			case 'e':       /* errata */
+				for (i=0; i<5; i++) {
+					mac_data.errata[i] = argv[2][i];
+				}
+				break;
+			case 'd':       /* date */
+				for (i=0; i<7; i++) {
+					mac_data.date[i] = argv[2][i];
+				}
+				break;
+			case 'p':       /* number of ports */
+				mac_data.tab_size = (unsigned char)simple_strtoul(argv[2],NULL,16);
+				break;
+			case '0':       /* mac 0 */
+			case '1':       /* mac 1 */
+			case '2':       /* mac 2 */
+			case '3':       /* mac 3 */
+			case '4':       /* mac 4 */
+			case '5':       /* mac 5 */
+			case '6':       /* mac 6 */
+			case '7':       /* mac 7 */
+				mac_val = simple_strtoull(argv[2],NULL,16);
+				for (i=0; i<6; i++) {
+					mac_data.mac[cmd-'0'][i] = *((unsigned char *)(((unsigned int)(&mac_val))+i+2));
+				}
+				break;
+			case 'h':       /* help */
+			default:
+				printf ("Usage:\n%s\n", cmdtp->usage);
+				break;
+		}
+	}
+	else {
+		mac_show();
+	}
+	return 0;
+}
+
+int mac_read_from_eeprom(void)
+{
+	int length,i;
+	unsigned char dev = ID_EEPROM_ADDR, *data, ethaddr[4][18], enetvar[32];
+	unsigned int crc = 0;
+
+	length = sizeof(EEPROM_data);
+	if(i2c_read (dev, 0, 1, (unsigned char *)(&mac_data), length)) {
+		printf("Read failed.\n");
+		return -1;
+	}
+
+	data = (unsigned char *)(&mac_data);
+	crc = crc32(crc, data, length-4);
+	if (crc != mac_data.crc) {
+		return -1;
+	}
+	else {
+		for(i=0; i<4; i++) {
+			if(memcmp(&mac_data.mac[i], "\0\0\0\0\0\0", 6)) {
+				sprintf(ethaddr[i], "%02x:%02x:%02x:%02x:%02x:%02x", \
+					mac_data.mac[i][0], \
+					mac_data.mac[i][1], \
+					mac_data.mac[i][2], \
+					mac_data.mac[i][3], \
+					mac_data.mac[i][4], \
+					mac_data.mac[i][5]);
+				sprintf(enetvar, i ? "eth%daddr" : "ethaddr", i);
+				setenv(enetvar, ethaddr[i]);
+			}
+		}
+	}
+	return 0;
+}
+#endif  /* CFG_ID_EEPROM */