RTOS/rtems
1
0
Fork 0
forked from Imagelibrary/rtems
Code Pull Requests Activity

GRETH: forcing autonegotiation during PHY initialization

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

15
c/src/lib/libbsp/sparc/shared/net/greth.c
View File

@@ -328,13 +328,18 @@ 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 */