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authorGraf Yang <graf.yang@analog.com>2009-05-05 02:26:27 -0400
committerMike Frysinger <vapier@gentoo.org>2009-05-06 08:47:37 -0400
commitf8ddcd58221cab63dd25c2324dd2032487f748b1 (patch)
tree42b5f335ae89377472898a53533a80ae642964cc /board/bf518f-ezbrd
parent53310b88eaa27fb5cb83144d0b22389190ad87a1 (diff)
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Blackfin: bf518f-ezbrd: reset ethernet PHY during init
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>
Diffstat (limited to 'board/bf518f-ezbrd')
-rw-r--r--board/bf518f-ezbrd/bf518f-ezbrd.c55
1 files changed, 51 insertions, 4 deletions
diff --git a/board/bf518f-ezbrd/bf518f-ezbrd.c b/board/bf518f-ezbrd/bf518f-ezbrd.c
index 2c7961a..1761b8e 100644
--- a/board/bf518f-ezbrd/bf518f-ezbrd.c
+++ b/board/bf518f-ezbrd/bf518f-ezbrd.c
@@ -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);