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Blackfin: bf518f-ezbrd: reset ethernet PHY during init

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We don't know what state the ethernet PHY is in when starting up, so make
sure we set it to a sane state.  This fixes troubles seen when Linux boots
up, configures the PHY is a non-default state, and then the system reboots
into U-Boot which previously expected a reset state only.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Graf Yang 2009-05-05 02:26:27 -04:00 committed by Mike Frysinger
parent 53310b88ea
commit f8ddcd5822
1 changed files with 51 additions and 4 deletions
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55
board/bf518f-ezbrd/bf518f-ezbrd.c
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@ -62,18 +62,65 @@ static void board_init_enetaddr(uchar *mac_addr)
eth_setenv_enetaddr("ethaddr", mac_addr);
}
#define KSZ_MAX_HZ 5000000
#define KSZ_WRITE 0x02
#define KSZ_READ 0x03
#define KSZ_REG_STPID 0x01 /* Register 1: Chip ID1 / Start Switch */
#define KSZ_REG_GC9 0x0b /* Register 11: Global Control 9 */
#define KSZ_REG_P3C0 0x30 /* Register 48: Port 3 Control 0 */
static int ksz8893m_transfer(struct spi_slave *slave, uchar dir, uchar reg,
uchar data, uchar result[3])
{
unsigned char dout[3] = { dir, reg, data, };
return spi_xfer(slave, sizeof(dout) * 8, dout, result, SPI_XFER_BEGIN | SPI_XFER_END);
}
static int ksz8893m_reg_set(struct spi_slave *slave, uchar reg, uchar data)
{
unsigned char din[3];
return ksz8893m_transfer(slave, KSZ_WRITE, reg, data, din);
}
static int ksz8893m_reg_clear(struct spi_slave *slave, uchar reg, uchar mask)
{
int ret = 0;
unsigned char din[3];
ret |= ksz8893m_transfer(slave, KSZ_READ, reg, 0, din);
ret |= ksz8893m_reg_set(slave, reg, din[2] & mask);
return ret;
}
static int ksz8893m_reset(struct spi_slave *slave)
{
int ret = 0;
/* Disable STPID mode */
ret |= ksz8893m_reg_clear(slave, KSZ_REG_GC9, 0x01);
/* Disable VLAN tag insert on Port3 */
ret |= ksz8893m_reg_clear(slave, KSZ_REG_P3C0, 0x04);
/* Start switch */
ret |= ksz8893m_reg_set(slave, KSZ_REG_STPID, 0x01);
return ret;
}
int board_eth_init(bd_t *bis)
{
static bool switch_is_alive = false;
int ret;
if (!switch_is_alive) {
struct spi_slave *slave = spi_setup_slave(0, 1, 5000000, SPI_MODE_3);
struct spi_slave *slave = spi_setup_slave(0, 1, KSZ_MAX_HZ, SPI_MODE_3);
if (slave) {
if (!spi_claim_bus(slave)) {
unsigned char dout[3] = { 2, 1, 1, };
unsigned char din[3];
ret = spi_xfer(slave, sizeof(dout) * 8, dout, din, SPI_XFER_BEGIN | SPI_XFER_END);
ret = ksz8893m_reset(slave);
if (!ret)
switch_is_alive = true;
spi_release_bus(slave);