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GRETH: forcing autonegotiation during PHY initialization

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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.
This commit is contained in:
Daniel Hellstrom
2013-03-12 15:30:09 +01:00
parent bee7c46f85
commit a79c36ad1d
1 changed files with 12 additions and 7 deletions
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19
c/src/lib/libbsp/sparc/shared/net/greth.c
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@@ -328,14 +328,19 @@ greth_initialize_hardware (struct greth_softc *sc)
phyaddr = sc->phyaddr; phyaddr = sc->phyaddr;
} }
/* get phy control register default values */ /* reset PHY */
while ((phyctrl = read_mii(sc, phyaddr, 0)) & 0x8000) {} write_mii(sc, phyaddr, 0, 0x8000);
/* reset PHY and wait for completion */ /* Wait for reset to complete and get default values */
write_mii(sc, phyaddr, 0, 0x8000 | phyctrl); while ((phyctrl = 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);
}
while ((read_mii(sc, phyaddr, 0)) & 0x8000) {}
/* Check if PHY is autoneg capable and then determine operating mode, /* Check if PHY is autoneg capable and then determine operating mode,
otherwise force it to 10 Mbit halfduplex */ otherwise force it to 10 Mbit halfduplex */
sc->gb = 0; sc->gb = 0;