From a79c36ad1da6edc74ec2cc7dfc7cec36054e7558 Mon Sep 17 00:00:00 2001 From: Daniel Hellstrom Date: Tue, 12 Mar 2013 15:30:09 +0100 Subject: GRETH: forcing autonegotiation during PHY initialization Looking at PHY Ctrl register without reseting it will give back old register content, that is not stable. Instead the PHY is reset and the autonogotiation capability is read out and started if present. --- c/src/lib/libbsp/sparc/shared/net/greth.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) (limited to 'c/src/lib/libbsp/sparc/shared/net') diff --git a/c/src/lib/libbsp/sparc/shared/net/greth.c b/c/src/lib/libbsp/sparc/shared/net/greth.c index 733b2a4977..769de59016 100644 --- a/c/src/lib/libbsp/sparc/shared/net/greth.c +++ b/c/src/lib/libbsp/sparc/shared/net/greth.c @@ -328,14 +328,19 @@ greth_initialize_hardware (struct greth_softc *sc) phyaddr = sc->phyaddr; } - /* get phy control register default values */ + /* reset PHY */ + write_mii(sc, phyaddr, 0, 0x8000); + + /* Wait for reset to complete and get default values */ while ((phyctrl = read_mii(sc, phyaddr, 0)) & 0x8000) {} - - /* reset PHY and wait for completion */ - write_mii(sc, phyaddr, 0, 0x8000 | phyctrl); - while ((read_mii(sc, phyaddr, 0)) & 0x8000) {} - + /* If autonegotiation implemented we start it */ + phystatus = read_mii(sc, phyaddr, 1); + if (phystatus & 0x0008) { + write_mii(sc, phyaddr, 0, phyctrl | 0x1200); + phyctrl = read_mii(sc, phyaddr, 0); + } + /* Check if PHY is autoneg capable and then determine operating mode, otherwise force it to 10 Mbit halfduplex */ sc->gb = 0; -- cgit v1.2.3