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SPEAr : Support for HW mac id read/write from i2c mem 

This patch adds the  support to read and write mac id from i2c
memory.
For reading:
	if (env contains ethaddr)
		pick env ethaddr
	else
		pick ethaddr from i2c memory
For writing:
	chip_config ethaddr XX:XX:XX:XX:XX:XX writes the mac id
	in i2c memory

Signed-off-by: Vipin <vipin.kumar@st.com>
This commit is contained in:
Vipin KUMAR 2010-01-15 19:15:49 +05:30 committed by Tom Rix
parent 566c9c16fe
commit f92994f0f7
2 changed files with 75 additions and 1 deletions
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68
board/spear/common/spr_misc.c
View File

@ -67,6 +67,12 @@ int dram_init(void)
int misc_init_r(void)
{
#if defined(CONFIG_CMD_NET)
uchar mac_id[6];
if (!eth_getenv_enetaddr("ethaddr", mac_id) && !i2c_read_mac(mac_id))
eth_setenv_enetaddr("ethaddr", mac_id);
#endif
setenv("verify", "n");
#if defined(CONFIG_SPEAR_USBTTY)
@ -101,12 +107,54 @@ int spear_board_init(ulong mach_type)
return 0;
}
static int i2c_read_mac(uchar *buffer)
{
u8 buf[2];
i2c_read(CONFIG_I2C_CHIPADDRESS, MAGIC_OFF, 1, buf, MAGIC_LEN);
/* Check if mac in i2c memory is valid */
if ((buf[0] == MAGIC_BYTE0) && (buf[1] == MAGIC_BYTE1)) {
/* Valid mac address is saved in i2c eeprom */
i2c_read(CONFIG_I2C_CHIPADDRESS, MAC_OFF, 1, buffer, MAC_LEN);
return 0;
}
return -1;
}
static int write_mac(uchar *mac)
{
u8 buf[2];
buf[0] = (u8)MAGIC_BYTE0;
buf[1] = (u8)MAGIC_BYTE1;
i2c_write(CONFIG_I2C_CHIPADDRESS, MAGIC_OFF, 1, buf, MAGIC_LEN);
buf[0] = (u8)~MAGIC_BYTE0;
buf[1] = (u8)~MAGIC_BYTE1;
i2c_read(CONFIG_I2C_CHIPADDRESS, MAGIC_OFF, 1, buf, MAGIC_LEN);
/* check if valid MAC address is saved in I2C EEPROM or not? */
if ((buf[0] == MAGIC_BYTE0) && (buf[1] == MAGIC_BYTE1)) {
i2c_write(CONFIG_I2C_CHIPADDRESS, MAC_OFF, 1, mac, MAC_LEN);
puts("I2C EEPROM written with mac address \n");
return 0;
}
puts("I2C EEPROM writing failed \n");
return -1;
}
int do_chip_config(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
void (*sram_setfreq) (unsigned int, unsigned int);
struct chip_data *chip = &chip_data;
unsigned char mac[6];
unsigned int frequency;
unsigned int reg, frequency;
char *s, *e;
char i2c_mac[20];
if ((argc > 3) || (argc < 2)) {
cmd_usage(cmdtp);
@ -136,6 +184,17 @@ int do_chip_config(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
chip->dramfreq = frequency;
}
return 0;
} else if (!strcmp(argv[1], "ethaddr")) {
s = argv[2];
for (reg = 0; reg < 6; ++reg) {
mac[reg] = s ? simple_strtoul(s, &e, 16) : 0;
if (s)
s = (*e) ? e + 1 : e;
}
write_mac(mac);
return 0;
} else if (!strcmp(argv[1], "print")) {
@ -156,6 +215,13 @@ int do_chip_config(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
else
printf("DDR Type = Not Known\n");
if (!i2c_read_mac(mac)) {
sprintf(i2c_mac, "%pM", mac);
printf("Ethaddr (from i2c mem) = %s\n", i2c_mac);
} else {
printf("Ethaddr (from i2c mem) = Not set\n");
}
printf("Xloader Rev = %s\n", chip->version);
return 0;

8
include/asm-arm/arch-spear/spr_defs.h
View File

@ -35,4 +35,12 @@ struct chip_data {
uchar version[32];
};
/* HW mac id in i2c memory definitions */
#define MAGIC_OFF 0x0
#define MAGIC_LEN 0x2
#define MAGIC_BYTE0 0x55
#define MAGIC_BYTE1 0xAA
#define MAC_OFF 0x2
#define MAC_LEN 0x6
#endif