/*
 * Copyright 2017, Data61, CSIRO (ABN 41 687 119 230)
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

/**
 *  \file   phy.c
 *
 *  \brief  APIs for configuring ethernet PHYs
 *
 *   This file contains the device abstraction APIs for ethernet PHYs.
 */

/*
* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
*/
/*
*  Redistribution and use in source and binary forms, with or without
*  modification, are permitted provided that the following conditions
*  are met:
*
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*    notice, this list of conditions and the following disclaimer.
*
*    Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the
*    distribution.
*
*    Neither the name of Texas Instruments Incorporated nor the names of
*    its contributors may be used to endorse or promote products derived
*    from this software without specific prior written permission.
*
*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
*  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
*  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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*/

#include <ethdrivers/plat/hw/hw_types.h>
#include <ethdrivers/plat/mdio.h>
#include <ethdrivers/plat/phy.h>

#define PHY_ADV_VAL_MASK                 (0xff10)

/*******************************************************************************
*                        API FUNCTION DEFINITIONS
*******************************************************************************/
/**
 * \brief   Reads the PHY ID.
 *
 * \param   mdioBaseAddr  Base Address of the MDIO Module Registers.
 * \param   phyAddr       PHY Adress.
 *
 * \return  32 bit PHY ID (ID1:ID2)
 *
 **/
unsigned int PhyIDGet(unsigned int mdioBaseAddr, unsigned int phyAddr)
{
    unsigned int id = 0;
    unsigned short data;

    /* read the ID1 register */
    MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_ID1, &data);

    /* update the ID1 value */
    id = data << PHY_ID_SHIFT;

    /* read the ID2 register */
    MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_ID2, &data);

    /* update the ID2 value */
    id |= data;

    /* return the ID in ID1:ID2 format */
    return id;
}

/**
 * \brief   Reads a register from the the PHY
 *
 * \param   mdioBaseAddr  Base Address of the MDIO Module Registers.
 * \param   phyAddr       PHY Adress.
 * \param   regIdx        Index of the register to be read
 * \param   regValAdr     address where value of the register will be written
 *
 * \return  status of the read
 *
 **/
unsigned int PhyRegRead(unsigned int mdioBaseAddr, unsigned int phyAddr,
                        unsigned int regIdx, unsigned short *regValAdr)
{
    return (MDIOPhyRegRead(mdioBaseAddr, phyAddr, regIdx, regValAdr));
}

/**
 * \brief   Writes a register with the input
 *
 * \param   mdioBaseAddr  Base Address of the MDIO Module Registers.
 * \param   phyAddr       PHY Adress.
 * \param   regIdx        Index of the register to be read
 * \param   regValAdr     value to be written
 *
 * \return  None
 *
 **/
void PhyRegWrite(unsigned int mdioBaseAddr, unsigned int phyAddr,
                 unsigned int regIdx, unsigned short regVal)
{
    MDIOPhyRegWrite(mdioBaseAddr, phyAddr, regIdx, regVal);
}

/**
 * \brief   Enables Loop Back mode
 *
 * \param   mdioBaseAddr  Base Address of the MDIO Module Registers.
 * \param   phyAddr       PHY Adress.
 *
 * \return  status after enabling.  \n
 *          TRUE if loop back is enabled \n
 *          FALSE if not able to enable
 *
 **/
unsigned int PhyLoopBackEnable(unsigned int mdioBaseAddr, unsigned int phyAddr)
{
    unsigned short data;

    if (MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_BCR, &data) != TRUE ) {
        return FALSE;
    }

    data |= PHY_LPBK_ENABLE;

    /* Enable loop back */
    MDIOPhyRegWrite(mdioBaseAddr, phyAddr, PHY_BCR, data);

    return TRUE;
}

/**
 * \brief   Disables Loop Back mode
 *
 * \param   mdioBaseAddr  Base Address of the MDIO Module Registers.
 * \param   phyAddr       PHY Adress.
 *
 * \return  status after enabling.  \n
 *          TRUE if loop back is disabled \n
 *          FALSE if not able to disable
 *
 **/
unsigned int PhyLoopBackDisable(unsigned int mdioBaseAddr, unsigned int phyAddr)
{
    unsigned short data;

    if (MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_BCR, &data) != TRUE ) {
        return FALSE;
    }

    data &= ~(PHY_LPBK_ENABLE);

    /* Disable loop back */
    MDIOPhyRegWrite(mdioBaseAddr, phyAddr, PHY_BCR, data);

    return TRUE;
}

/**
 * \brief   This function ask the phy device to start auto negotiation.
 *
 *
 * \param   mdioBaseAddr  Base Address of the MDIO Module Registers.
 * \param   phyAddr       PHY Adress.
 * \param   advVal        Autonegotiation advertisement value
 * \param   gigAdvVal     Gigabit capability advertisement value
 *          advVal can take the following any OR combination of the values \n
 *               PHY_100BTX - 100BaseTX \n
 *               PHY_100BTX_FD - Full duplex capabilty for 100BaseTX \n
 *               PHY_10BT - 10BaseT \n
 *               PHY_10BT_FD - Full duplex capability for 10BaseT \n
 *          gigAdvVal can take one of the following values \n
 *               PHY_NO_1000BT - No 1000Base-T capability\n
 *               PHY_1000BT_FD - Full duplex capabilty for 1000 Base-T \n
 *               PHY_1000BT_HD - Half duplex capabilty for 1000 Base-T \n
 *               FALSE - It is passed as an argument if phy dosen't support
 *                       Giga bit capability
 *
 * \return  status after autonegotiation \n
 *          TRUE if autonegotiation started
 *          FALSE if autonegotiation not started
 *
 **/
unsigned int PhyAutoNegotiate(unsigned int mdioBaseAddr, unsigned int phyAddr,
                              unsigned short *advPtr, unsigned short *gigAdvPtr)
{
    volatile unsigned short data;
    volatile unsigned short anar;

    if (MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_BCR, &data) != TRUE ) {
        return FALSE;
    }

    data |= PHY_AUTONEG_ENABLE;

    if (*gigAdvPtr != 0) {
        /* Set phy for gigabit speed */
        data &= PHY_SPEED_MASK;
        data |= PHY_SPEED_1000MBPS;
    }

    /* Enable Auto Negotiation */
    MDIOPhyRegWrite(mdioBaseAddr, phyAddr, PHY_BCR, data);

    if (MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_BCR, &data) != TRUE ) {
        return FALSE;
    }

    /* Write Auto Negotiation capabilities */
    MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_AUTONEG_ADV, &anar);
    anar &= ~PHY_ADV_VAL_MASK;
    MDIOPhyRegWrite(mdioBaseAddr, phyAddr, PHY_AUTONEG_ADV, (anar | (*advPtr)));

    if (*gigAdvPtr != 0) {
        /* Write the gigabit capabilities */
        MDIOPhyRegWrite(mdioBaseAddr, phyAddr, PHY_1000BT_CONTROL, (*gigAdvPtr));
    }

    data |= PHY_AUTONEG_RESTART;

    /* Start Auto Negotiation */
    MDIOPhyRegWrite(mdioBaseAddr, phyAddr, PHY_BCR, data);

    return TRUE;
}

/**
 * \brief   Returns the status of Auto Negotiation completion.
 *
 * \param   mdioBaseAddr  Base Address of the MDIO Module Registers.
 * \param   phyAddr       PHY Adress.
 *
 * \return  Auto negotiation completion status \n
 *          TRUE if auto negotiation is completed
 *          FALSE if auto negotiation is not completed
 **/
unsigned int PhyAutoNegStatusGet(unsigned int mdioBaseAddr, unsigned int phyAddr)
{
    volatile unsigned short data;

    MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_BSR, &data);

    /* Auto negotiation completion status */
    if (PHY_AUTONEG_COMPLETE == (data & (PHY_AUTONEG_STATUS))) {
        return TRUE;
    }

    return FALSE;
}

/**
 * \brief   Reads the Link Partner Ability register of the PHY.
 *
 * \param   mdioBaseAddr    Base Address of the MDIO Module Registers.
 * \param   phyAddr         PHY Adress.
 * \param   ptnerAblty      Pointer to which partner ability will be written.
 * \param   gbpsPtnerAblty  Pointer to which Giga bit capability will be written.
 *
 *          gbpsPtnerAblty can take following Macros.\n
 *
 *          TRUE  - It is passed as argument if phy supports Giga bit capability.\n
 *          FALSE - It is passed as argument if phy dosen't supports Giga bit
 *                  capability.\n
 *
 * \return  status after reading \n
 *          TRUE if reading successful
 *          FALSE if reading failed
 **/
unsigned int PhyPartnerAbilityGet(unsigned int mdioBaseAddr,
                                  unsigned int phyAddr,
                                  unsigned short *ptnerAblty,
                                  unsigned short *gbpsPtnerAblty)
{
    unsigned int status;

    status = MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_LINK_PARTNER_ABLTY,
                            ptnerAblty);

    if (*gbpsPtnerAblty != 0) {
        status = status | MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_1000BT_STATUS,
                                         gbpsPtnerAblty);
    }

    return status;
}

/**
 * \brief   Reads the link status of the PHY.
 *
 * \param   mdioBaseAddr  Base Address of the MDIO Module Registers.
 * \param   phyAddr       PHY Adress.
 * \param   retries       The number of retries before indicating down status
 *
 * \return  link status after reading \n
 *          TRUE if link is up
 *          FALSE if link is down \n
 *
 * \note    This reads both the basic status register of the PHY and the
 *          link register of MDIO for double check
 **/
unsigned int PhyLinkStatusGet(unsigned int mdioBaseAddr,
                              unsigned int phyAddr,
                              volatile unsigned int retries)
{
    volatile unsigned short linkStatus;

    retries++;
    while (retries) {
        /* First read the BSR of the PHY */
        MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_BSR, &linkStatus);

        if (linkStatus & PHY_LINK_STATUS) {
            return TRUE;
        }

        retries--;
    }

    return FALSE;
}


/* The next two functions were copied from 'bb-sel4' project at:
 *    https://github.com/juli1/bb-sel4
 * In particular, they were taken from:
 *    https://github.com/juli1/bb-sel4/blob/701e87f4d4a403d3b0c02326d42e8580a7ff4b7f/bb-eth/components/ConsumerThreadImpl/src/phy.c
 */
unsigned int PhyReset(unsigned int mdioBaseAddr, unsigned int phyAddr)
{
    unsigned short data;

    data = PHY_SOFTRESET;

    /* Reset the phy */
    MDIOPhyRegWrite(mdioBaseAddr, phyAddr, PHY_BCR, data);

    /* wait till the reset bit is auto cleared */
    while(data & PHY_SOFTRESET)
    {
        /* Read the reset */
        if(MDIOPhyRegRead(mdioBaseAddr, phyAddr, PHY_BCR, &data) != TRUE)
        {
            return FALSE;
        }
    }

    return TRUE;
}

unsigned int PhyConfigure(unsigned int mdioBaseAddr, unsigned int phyAddr,
                              unsigned short speed, unsigned short duplexMode)
{
    /* Set the configurations */
    MDIOPhyRegWrite(mdioBaseAddr, phyAddr, PHY_BCR, (speed | duplexMode));

        return TRUE;
}

/**************************** End Of File ***********************************/