/****************************************************************************
* Function: EthPhyConfigureMdix
*
* PreCondition: - Communication to the PHY should have been established.
*
* Input: oFlags - the requested open flags: ETH_OPEN_MDIX_AUTO, ETH_OPEN_MDIX_NORM/ETH_OPEN_MDIX_SWAP
*
* Output: ETH_RES_OK - success,
* an error code otherwise
*
*
* Side Effects: None
*
* Overview: This function configures the MDIX mode for the PHY.
*
* Note: None
*****************************************************************************/
eEthRes EthPhyConfigureMdix(eEthOpenFlags oFlags)
{
unsigned short phyReg;
phyReg=EthMIIMReadReg(PHY_REG_PHY_CTRL, PHY_ADDRESS);
if(oFlagsÐ_OPEN_MDIX_AUTO)
{ // enable Auto-MDIX
phyReg|=_PHYCTRL_MDIX_EN_MASK;
}
else
{ // no Auto-MDIX
phyReg&=~(_PHYCTRL_MDIX_EN_MASK); // disable Auto-MDIX
if(oFlagsÐ_OPEN_MDIX_SWAP)
{
phyReg|=_PHYCTRL_FORCE_MDIX_MASK; // swap
}
else
{
phyReg&=~(_PHYCTRL_FORCE_MDIX_MASK); // normal
}
}
EthMIIMWriteReg(PHY_REG_PHY_CTRL, PHY_ADDRESS, phyReg);
return ETH_RES_OK;
}
/****************************************************************************
* Function: EthPhyConfigureMII
*
* PreCondition: - Communication to the PHY should have been established.
*
* Input: cFlags - the requested open flags: ETH_PHY_CFG_RMII/ETH_PHY_CFG_MII
*
* Output: ETH_RES_OK - success,
* an error code otherwise
*
*
* Side Effects: None
*
* Overview: This function configures the PHY in one of MII/RMII operation modes.
*
* Note: None
*****************************************************************************/
eEthRes EthPhyConfigureMII(eEthPhyCfgFlags cFlags)
{
unsigned short phyReg;
phyReg=EthMIIMReadReg(PHY_REG_RMII_BYPASS, PHY_ADDRESS);
if(cFlagsÐ_PHY_CFG_RMII)
{
phyReg|=_RMIIBYPASS_RMII_MODE_MASK;
phyReg&=~_RMIIBYPASS_RMII_REV1_0_MASK; // use RMII 1.2
}
else
{
phyReg&=~(_RMIIBYPASS_RMII_MODE_MASK); // MII
}
EthMIIMWriteReg(PHY_REG_RMII_BYPASS, PHY_ADDRESS, phyReg); // update the RMII and Bypass Register
return ETH_RES_OK;
}
/****************************************************************************
* Function: EthPhyInit
*
* PreCondition: - EthInit should have been called.
*
* Input: oFlags - the requested open flags
* cFlags - PHY MII/RMII configuration flags
* pResFlags - address to store the initialization result
*
* Output: ETH_RES_OK for success,
* an error code otherwise
*
*
* Side Effects: None
*
* Overview: This function initializes the PHY communication.
* It tries to detect the external PHY, to read the capabilties and find a match
* with the requested features.
* Then it programs the PHY accordingly.
*
* Note: None
*****************************************************************************/
eEthRes __attribute__((weak)) EthPhyInit(eEthOpenFlags oFlags, eEthPhyCfgFlags cFlags, eEthOpenFlags* pResFlags)
{
unsigned short ctrlReg;
eEthPhyCfgFlags hwFlags, swFlags;
unsigned short phyCpbl, openReqs, matchCpbl;
eEthRes res;
// the way the hw is configured
hwFlags=(DEVCFG3bits.FMIIEN!=0)?ETH_PHY_CFG_MII:ETH_PHY_CFG_RMII;
hwFlags|=(DEVCFG3bits.FETHIO!=0)?ETH_PHY_CFG_DEFAULT:ETH_PHY_CFG_ALTERNATE;
if(cFlagsÐ_PHY_CFG_AUTO)
{
cFlags=hwFlags;
}
else
{ // some minimal check against the way the hw is configured
swFlags=cFlags&(ETH_PHY_CFG_RMII|ETH_PHY_CFG_ALTERNATE);
if((swFlags ^ hwFlags)!=0)
{ // hw-sw configuration mismatch MII/RMII, ALT/DEF config
return ETH_RES_CFG_ERR;
}
}
_PhyAdd=EthPhyMIIMAddress(); // get the PHY address
if(oFlags&(ETH_OPEN_PHY_LOOPBACK|ETH_OPEN_MAC_LOOPBACK))
{
oFlags&=~ETH_OPEN_AUTO; // no negotiation in loopback mode!
}
if(!(oFlagsÐ_OPEN_AUTO))
{
oFlags&=~ETH_OPEN_MDIX_AUTO; // Auto-MDIX has to be in auto negotiation only
}
_PhyInitIo(); // init IO pins
EthMIIMInit(GetSystemClock(), EthPhyMIIMClock(), oFlags, (cFlagsÐ_PHY_CFG_RMII)!=0);
// try to detect the PHY and reset it
if(!_PhyDetectReset())
{ // failed to detect the PHY
return ETH_RES_DTCT_ERR;
}
// provide some defaults
if(!(oFlags&(ETH_OPEN_FDUPLEX|ETH_OPEN_HDUPLEX)))
{
oFlags|=ETH_OPEN_HDUPLEX;
}
if(!(oFlags&(ETH_OPEN_100|ETH_OPEN_10)))
{
oFlags|=ETH_OPEN_10;
}
if(oFlagsÐ_OPEN_AUTO)
{ // advertise auto negotiation
openReqs=_BMSTAT_AN_ABLE_MASK;
if(oFlagsÐ_OPEN_100)
{
if(oFlagsÐ_OPEN_FDUPLEX)
{
openReqs|=_BMSTAT_BASE100TX_FDX_MASK;
}
if(oFlagsÐ_OPEN_HDUPLEX)
{
openReqs|=_BMSTAT_BASE100TX_HDX_MASK;
}
}
if(oFlagsÐ_OPEN_10)
{
if(oFlagsÐ_OPEN_FDUPLEX)
{
openReqs|=_BMSTAT_BASE10T_FDX_MASK;
}
if(oFlagsÐ_OPEN_HDUPLEX)
{
openReqs|=_BMSTAT_BASE10T_HDX_MASK;
}
}
}
else
{ // no auto negotiation
if(oFlagsÐ_OPEN_100)
{
openReqs=(oFlagsÐ_OPEN_FDUPLEX)?_BMSTAT_BASE100TX_FDX_MASK:_BMSTAT_BASE100TX_HDX_MASK;
}
else
{
openReqs=(oFlagsÐ_OPEN_FDUPLEX)?_BMSTAT_BASE10T_FDX_MASK:_BMSTAT_BASE10T_HDX_MASK;
}
}
// try to match the oFlags with the PHY capabilities
phyCpbl=EthMIIMReadReg(PHY_REG_BMSTAT, _PhyAdd);
matchCpbl=(openReqs&(MAC_COMM_CPBL_MASK|_BMSTAT_AN_ABLE_MASK))&phyCpbl; // common features
if(!(matchCpbl&MAC_COMM_CPBL_MASK))
{ // no match?
return ETH_RES_CPBL_ERR;
}
// we're ok, we can configure the PHY
res=EthPhyConfigureMII(cFlags);
if(res!=ETH_RES_OK)
{
return res;
}
res=EthPhyConfigureMdix(oFlags);
if(res!=ETH_RES_OK)
{
return res;
}
if(matchCpbl&_BMSTAT_AN_ABLE_MASK)
{ // ok, we can perform auto negotiation
unsigned short anadReg;
anadReg=(((matchCpbl>>_BMSTAT_NEGOTIATION_POS)<<_ANAD_NEGOTIATION_POS)&_ANAD_NEGOTIATION_MASK)|PROT_802_3;
if(MAC_PAUSE_CPBL_MASK&MAC_PAUSE_TYPE_PAUSE)
{
anadReg|=_ANAD_PAUSE_MASK;
}
if(MAC_PAUSE_CPBL_MASK&MAC_PAUSE_TYPE_ASM_DIR)
{
anadReg|=_ANAD_ASM_DIR_MASK;
}
EthMIIMWriteReg(PHY_REG_ANAD, _PhyAdd, anadReg); // advertise our capabilities
EthPhyRestartNegotiation(); // restart negotiation and we'll have to wait
}