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/*
* (C) Copyright 2001
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* This provides a bit-banged interface to the ethernet MII management
* channel.
*/
#include <common.h>
#include <miiphy.h>
#if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
/*****************************************************************************
*
* Read the OUI, manufacture's model number, and revision number.
*
* OUI: 22 bits (unsigned int)
* Model: 6 bits (unsigned char)
* Revision: 4 bits (unsigned char)
*
* Returns:
* 0 on success
*/
int miiphy_info (unsigned char addr,
unsigned int *oui,
unsigned char *model, unsigned char *rev)
{
unsigned int reg = 0;
/*
* Trick: we are reading two 16 registers into a 32 bit variable
* so we do a 16 read into the high order bits of the variable (big
* endian, you know), shift it down 16 bits, and the read the rest.
*/
if (miiphy_read (addr, PHY_PHYIDR2, (unsigned short *) ®) != 0) {
#ifdef DEBUG
printf ("PHY ID register 2 read failed\n");
#endif
return (-1);
}
reg >>= 16;
#ifdef DEBUG
printf ("PHY_PHYIDR2 @ 0x%x = 0x%04x\n", addr, reg);
#endif
if (reg == 0xFFFF) {
/* No physical device present at this address */
return (-1);
}
if (miiphy_read (addr, PHY_PHYIDR1, (unsigned short *) ®) != 0) {
#ifdef DEBUG
printf ("PHY ID register 1 read failed\n");
#endif
return (-1);
}
#ifdef DEBUG
printf ("PHY_PHYIDR[1,2] @ 0x%x = 0x%08x\n", addr, reg);
#endif
*oui = ( reg >> 10);
*model = (unsigned char) ((reg >> 4) & 0x0000003F);
*rev = (unsigned char) ( reg & 0x0000000F);
return (0);
}
/*****************************************************************************
*
* Reset the PHY.
* Returns:
* 0 on success
*/
int miiphy_reset (unsigned char addr)
{
unsigned short reg;
int loop_cnt;
if (miiphy_write (addr, PHY_BMCR, 0x8000) != 0) {
#ifdef DEBUG
printf ("PHY reset failed\n");
#endif
return (-1);
}
/*
* Poll the control register for the reset bit to go to 0 (it is
* auto-clearing). This should happen within 0.5 seconds per the
* IEEE spec.
*/
loop_cnt = 0;
reg = 0x8000;
while (((reg & 0x8000) != 0) && (loop_cnt++ < 1000000)) {
if (miiphy_read (addr, PHY_BMCR, ®) != 0) {
# ifdef DEBUG
printf ("PHY status read failed\n");
# endif
return (-1);
}
}
if ((reg & 0x8000) == 0) {
return (0);
} else {
printf ("PHY reset timed out\n");
return (-1);
}
return (0);
}
/*****************************************************************************
*
* Determine the ethernet speed (10/100).
*/
int miiphy_speed (unsigned char addr)
{
unsigned short reg;
if (miiphy_read (addr, PHY_ANLPAR, ®)) {
printf ("PHY speed1 read failed, assuming 10bT\n");
return (_10BASET);
}
if ((reg & PHY_ANLPAR_100) != 0) {
return (_100BASET);
} else {
return (_10BASET);
}
}
/*****************************************************************************
*
* Determine full/half duplex.
*/
int miiphy_duplex (unsigned char addr)
{
unsigned short reg;
if (miiphy_read (addr, PHY_ANLPAR, ®)) {
printf ("PHY duplex read failed, assuming half duplex\n");
return (HALF);
}
if ((reg & (PHY_ANLPAR_10FD | PHY_ANLPAR_TXFD)) != 0) {
return (FULL);
} else {
return (HALF);
}
}
#ifdef CFG_FAULT_ECHO_LINK_DOWN
/*****************************************************************************
*
* Determine link status
*/
int miiphy_link (unsigned char addr)
{
unsigned short reg;
if (miiphy_read (addr, PHY_BMSR, ®)) {
printf ("PHY_BMSR read failed, assuming no link\n");
return (0);
}
/* Determine if a link is active */
if ((reg & PHY_BMSR_LS) != 0) {
return (1);
} else {
return (0);
}
}
#endif
#endif /* CONFIG_MII || (CONFIG_COMMANDS & CFG_CMD_MII) */
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