cpu/ppc4xx/miiphy.c

/*-----------------------------------------------------------------------------+
  |
  |	  This source code has been made available to you by IBM on an AS-IS
  |	  basis.  Anyone receiving this source is licensed under IBM
  |	  copyrights to use it in any way he or she deems fit, including
  |	  copying it, modifying it, compiling it, and redistributing it either
  |	  with or without modifications.  No license under IBM patents or
  |	  patent applications is to be implied by the copyright license.
  |
  |	  Any user of this software should understand that IBM cannot provide
  |	  technical support for this software and will not be responsible for
  |	  any consequences resulting from the use of this software.
  |
  |	  Any person who transfers this source code or any derivative work
  |	  must include the IBM copyright notice, this paragraph, and the
  |	  preceding two paragraphs in the transferred software.
  |
  |	  COPYRIGHT   I B M   CORPORATION 1995
  |	  LICENSED MATERIAL  -	PROGRAM PROPERTY OF I B M
  +-----------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------+
  |
  |  File Name:	 miiphy.c
  |
  |  Function:	 This module has utilities for accessing the MII PHY through
  |	       the EMAC3 macro.
  |
  |  Author:	 Mark Wisner
  |
  |  Change Activity-
  |
  |  Date	 Description of Change					     BY
  |  ---------	 ---------------------					     ---
  |  05-May-99	 Created						     MKW
  |  01-Jul-99	 Changed clock setting of sta_reg from 66Mhz to 50Mhz to
  |		 better match OPB speed. Also modified delay times.	     JWB
  |  29-Jul-99	 Added Full duplex support				     MKW
  |  24-Aug-99	 Removed printf from dp83843_duplex()			     JWB
  |  19-Jul-00	 Ported to esd cpci405					     sr
  |  23-Dec-03	 Ported from miiphy.c to 440GX Travis Sawyer		     TBS
  |		 <travis.sawyer@sandburst.com>
  |
  +-----------------------------------------------------------------------------*/

#include <common.h>
#include <asm/processor.h>
#include <ppc_asm.tmpl>
#include <commproc.h>
#include <ppc4xx_enet.h>
#include <405_mal.h>
#include <miiphy.h>


/***********************************************************/
/* Dump out to the screen PHY regs			   */
/***********************************************************/

void miiphy_dump (unsigned char addr)
{
	unsigned long i;
	unsigned short data;


	for (i = 0; i < 0x1A; i++) {
		if (miiphy_read (addr, i, &data)) {
			printf ("read error for reg %lx\n", i);
			return;
		}
		printf ("Phy reg %lx ==> %4x\n", i, data);

		/* jump to the next set of regs */
		if (i == 0x07)
			i = 0x0f;

	}			/* end for loop */
}				/* end dump */


/***********************************************************/
/* (Re)start autonegotiation				   */
/***********************************************************/
int phy_setup_aneg (unsigned char addr)
{
	unsigned short ctl, adv;

	/* Setup standard advertise */
	miiphy_read (addr, PHY_ANAR, &adv);
	adv |= (PHY_ANLPAR_ACK | PHY_ANLPAR_RF | PHY_ANLPAR_T4 |
		PHY_ANLPAR_TXFD | PHY_ANLPAR_TX | PHY_ANLPAR_10FD |
		PHY_ANLPAR_10);
	miiphy_write (addr, PHY_ANAR, adv);

	/* Start/Restart aneg */
	miiphy_read (addr, PHY_BMCR, &ctl);
	ctl |= (PHY_BMCR_AUTON | PHY_BMCR_RST_NEG);
	miiphy_write (addr, PHY_BMCR, ctl);

	return 0;
}


/***********************************************************/
/* read a phy reg and return the value with a rc	   */
/***********************************************************/
unsigned int miiphy_getemac_offset (void)
{
#if defined(CONFIG_440) && defined(CONFIG_NET_MULTI)
	unsigned long zmii;
	unsigned long eoffset;

	/* Need to find out which mdi port we're using */
	zmii = in32 (ZMII_FER);

	if (zmii & (ZMII_FER_MDI << ZMII_FER_V (0))) {
		/* using port 0 */
		eoffset = 0;
	} else if (zmii & (ZMII_FER_MDI << ZMII_FER_V (1))) {
		/* using port 1 */
		eoffset = 0x100;
	} else if (zmii & (ZMII_FER_MDI << ZMII_FER_V (2))) {
		/* using port 2 */
		eoffset = 0x400;
	} else if (zmii & (ZMII_FER_MDI << ZMII_FER_V (3))) {
		/* using port 3 */
		eoffset = 0x600;
	} else {
		/* None of the mdi ports are enabled! */
		/* enable port 0 */
		zmii |= ZMII_FER_MDI << ZMII_FER_V (0);
		out32 (ZMII_FER, zmii);
		eoffset = 0;
		/* need to soft reset port 0 */
		zmii = in32 (EMAC_M0);
		zmii |= EMAC_M0_SRST;
		out32 (EMAC_M0, zmii);
	}

	return (eoffset);
#else
	return 0;
#endif
}


int miiphy_read (unsigned char addr, unsigned char reg, unsigned short *value)
{
	unsigned long sta_reg;	/* STA scratch area */
	unsigned long i;
	unsigned long emac_reg;


	emac_reg = miiphy_getemac_offset ();
	/* see if it is ready for 1000 nsec */
	i = 0;

	/* see if it is ready for  sec */
	while ((in32 (EMAC_STACR + emac_reg) & EMAC_STACR_OC) == 0) {
		udelay (7);
		if (i > 5) {
#if 0
			printf ("read err 1\n");
#endif
			return -1;
		}
		i++;
	}
	sta_reg = reg;		/* reg address */
	/* set clock (50Mhz) and read flags */
#if defined(CONFIG_440GX)
	sta_reg |= EMAC_STACR_READ;
#else
	sta_reg = (sta_reg | EMAC_STACR_READ) & ~EMAC_STACR_CLK_100MHZ;
#endif

#if defined(CONFIG_PHY_CLK_FREQ) && !defined(CONFIG_440GX)
	sta_reg = sta_reg | CONFIG_PHY_CLK_FREQ;
#endif
	sta_reg = sta_reg | (addr << 5);	/* Phy address */

	out32 (EMAC_STACR + emac_reg, sta_reg);
#if 0				/* test-only */
	printf ("a2: write: EMAC_STACR=0x%0x\n", sta_reg);	/* test-only */
#endif

	sta_reg = in32 (EMAC_STACR + emac_reg);
	i = 0;
	while ((sta_reg & EMAC_STACR_OC) == 0) {
		udelay (7);
		if (i > 5) {
			return -1;
		}
		i++;
		sta_reg = in32 (EMAC_STACR + emac_reg);
	}
	if ((sta_reg & EMAC_STACR_PHYE) != 0) {
		return -1;
	}

	*value = *(short *) (&sta_reg);
	return 0;


}				/* phy_read */


/***********************************************************/
/* write a phy reg and return the value with a rc	    */
/***********************************************************/

int miiphy_write (unsigned char addr, unsigned char reg, unsigned short value)
{
	unsigned long sta_reg;	/* STA scratch area */
	unsigned long i;
	unsigned long emac_reg;

	emac_reg = miiphy_getemac_offset ();
	/* see if it is ready for 1000 nsec */
	i = 0;

	while ((in32 (EMAC_STACR + emac_reg) & EMAC_STACR_OC) == 0) {
		if (i > 5)
			return -1;
		udelay (7);
		i++;
	}
	sta_reg = 0;
	sta_reg = reg;		/* reg address */
	/* set clock (50Mhz) and read flags */
#if defined(CONFIG_440GX)
	sta_reg |= EMAC_STACR_WRITE;
#else
	sta_reg = (sta_reg | EMAC_STACR_WRITE) & ~EMAC_STACR_CLK_100MHZ;
#endif

#if defined(CONFIG_PHY_CLK_FREQ) && !defined(CONFIG_440GX)
	sta_reg = sta_reg | CONFIG_PHY_CLK_FREQ;	/* Set clock frequency (PLB freq. dependend) */
#endif
	sta_reg = sta_reg | ((unsigned long) addr << 5);	/* Phy address */
	memcpy (&sta_reg, &value, 2);	/* put in data */

	out32 (EMAC_STACR + emac_reg, sta_reg);

	/* wait for completion */
	i = 0;
	sta_reg = in32 (EMAC_STACR + emac_reg);
	while ((sta_reg & EMAC_STACR_OC) == 0) {
		udelay (7);
		if (i > 5)
			return -1;
		i++;
		sta_reg = in32 (EMAC_STACR + emac_reg);
	}

	if ((sta_reg & EMAC_STACR_PHYE) != 0)
		return -1;
	return 0;

}				/* phy_write */