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//==========================================================================

//

//      lxt970.c

//

//      Driver for LXT970 PHY

//

//==========================================================================

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// -------------------------------------------                              

// This file is part of eCos, the Embedded Configurable Operating System.   

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//

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// for more details.                                                        

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//

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//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    gthomas

// Contributors: gthomas, jskov

//               Grant Edwards <grante@visi.com>

// Date:         2001-07-31

// Purpose:      

// Description:  

//

//####DESCRIPTIONEND####

//

//========================================================================*/

#include "std.h"

#include "phy.h"

// address of the LX970 phy

#ifdef CYGPKG_DEVS_ETH_ARM_KS32C5000_PHYADDR

#define LX970_ADDR  CYGPKG_DEVS_ETH_ARM_KS32C5000_PHYADDR

#else

#define LX970_ADDR  1

#endif

// LX970 register offsets

#define LX970_CNTL_REG          0x00

#define LX970_STATUS_REG        0x01

#define LX970_ID_REG1           0x02

#define LX970_ID_REG2           0x03

#define LX970_ANA_REG           0x04

#define LX970_ANLPAR_REG        0x05

#define LX970_ANE_REG           0x06

#define LX970_MIRROR_REG        0x10

#define LX970_INTEN_REG         0x11

#define LX970_INTSTAT_REG       0x12

#define LX970_CONFIG_REG        0x13

#define LX970_CHIPSTAT_REG      0x14

// LX970 Control register bit defines

#define LX970_CNTL_RESET        0x8000

#define LX970_CNTL_LOOPBACK     0x4000

#define LX970_CNTL_SPEED        0x2000  // 1=100Meg, 0=10Meg

#define LX970_CNTL_AN           0x1000  // 1=Enable auto negotiation, 0=disable it

#define LX970_CNTL_PWRDN        0x0800  // 1=Enable power down

#define LX970_CNTL_ISOLATE      0x0400  // 1=Isolate from MII

#define LX970_CNTL_RSTRT_AN     0x0200  // 1=Restart Auto Negotioation process

#define LX970_CNTL_FULL_DUP     0x0100  // 1=Enable full duplex mode, 0=half dup

#define LX970_CNTL_TST_COLL     0x0080  // 1=Enable collision test

#define Bit(n) (1<<(n))

#define LX970_ANA_PAUSE_ENA    Bit(10)

#define LX970_ANA_100T4        Bit(9)

#define LX970_ANA_100TX_FULL   Bit(8)

#define LX970_ANA_100TX        Bit(7)

#define LX970_ANA_10T_FULL     Bit(6)

#define LX970_ANA_10T          Bit(5)

#define LX970_ANA_SEL_802_3    Bit(0)

#define LX970_CHIPSTAT_LINKUP    Bit(13)

#define LX970_CHIPSTAT_FULLDUP   Bit(12)

#define LX970_CHIPSTAT_100M      Bit(11)

#define LX970_CHIPSTAT_ANEG_DONE Bit(9)

#define LX970_CHIPSTAT_PAGE_RX   Bit(8)

#define LX970_CHIPSTAT_LOWVOLT   Bit(2)

// phy functions for Level1 PHY LXT970

void PhyReset(void)

{

    // first software reset the LX970      

    MiiStationWrite(LX970_CNTL_REG, LX970_ADDR, LX970_CNTL_RESET);

    MiiStationWrite(LX970_CNTL_REG, LX970_ADDR, 0);

    // set low level drive for MII lines, enable interrupt output

    MiiStationWrite(17, LX970_ADDR, BIT3+BIT1);

    // default values for 100M encryption are wrong, so fix them

    // and configure LEDC to be activity indicator

     MiiStationWrite(19, LX970_ADDR, BIT7);

    // initialize auto-negotiation capabilities

    MiiStationWrite(LX970_ANA_REG,LX970_ADDR,

                    LX970_ANA_PAUSE_ENA+

                    LX970_ANA_100T4+

                    LX970_ANA_100TX_FULL+

                    LX970_ANA_100TX+

                    LX970_ANA_10T_FULL+

                    LX970_ANA_10T+

                    LX970_ANA_SEL_802_3);

#if 1

    // Now start an auto negotiation

    MiiStationWrite(LX970_CNTL_REG, LX970_ADDR,

                    LX970_CNTL_AN+

                    LX970_CNTL_RSTRT_AN);

#else

    // force to 10M full duplex

    MiiStationWrite(LX970_CNTL_REG, LX970_ADDR,

                    LX970_CNTL_FULL_DUP);

#endif

}

unsigned PhyStatus(void)

{

  unsigned lxt970Status = MiiStationRead(LX970_CHIPSTAT_REG,LX970_ADDR);

  unsigned r = 0;

  if (lxt970Status & LX970_CHIPSTAT_LINKUP)

    r |= PhyStatus_LinkUp;

  if (lxt970Status & LX970_CHIPSTAT_FULLDUP)

    r |= PhyStatus_FullDuplex;

  if (lxt970Status & LX970_CHIPSTAT_100M)

    r |=  PhyStatus_100Mb;

  return r;

}

void PhyInterruptAck(void)

{

  MiiStationRead(1,LX970_ADDR);

  MiiStationRead(18,LX970_ADDR);

}

// EOF lxt970.c