// SPDX-License-Identifier: GPL-2.0
/* $Date: 2005/10/24 23:18:13 $ $RCSfile: mv88e1xxx.c,v $ $Revision: 1.49 $ */
#include "common.h"
#include "mv88e1xxx.h"
#include "cphy.h"
#include "elmer0.h"

/* MV88E1XXX MDI crossover register values */
#define CROSSOVER_MDI   0
#define CROSSOVER_MDIX  1
#define CROSSOVER_AUTO  3

#define INTR_ENABLE_MASK 0x6CA0

/*
 * Set the bits given by 'bitval' in PHY register 'reg'.
 */
static void mdio_set_bit(struct cphy *cphy, int reg, u32 bitval)
{
        u32 val;

        (void) simple_mdio_read(cphy, reg, &val);
        (void) simple_mdio_write(cphy, reg, val | bitval);
}

/*
 * Clear the bits given by 'bitval' in PHY register 'reg'.
 */
static void mdio_clear_bit(struct cphy *cphy, int reg, u32 bitval)
{
        u32 val;

        (void) simple_mdio_read(cphy, reg, &val);
        (void) simple_mdio_write(cphy, reg, val & ~bitval);
}

/*
 * NAME:   phy_reset
 *
 * DESC:   Reset the given PHY's port. NOTE: This is not a global
 *         chip reset.
 *
 * PARAMS: cphy     - Pointer to PHY instance data.
 *
 * RETURN:  0 - Successful reset.
 *         -1 - Timeout.
 */
static int mv88e1xxx_reset(struct cphy *cphy, int wait)
{
        u32 ctl;
        int time_out = 1000;

        mdio_set_bit(cphy, MII_BMCR, BMCR_RESET);

        do {
                (void) simple_mdio_read(cphy, MII_BMCR, &ctl);
                ctl &= BMCR_RESET;
                if (ctl)
                        udelay(1);
        } while (ctl && --time_out);

        return ctl ? -1 : 0;
}

static int mv88e1xxx_interrupt_enable(struct cphy *cphy)
{
        /* Enable PHY interrupts. */
        (void) simple_mdio_write(cphy, MV88E1XXX_INTERRUPT_ENABLE_REGISTER,
                   INTR_ENABLE_MASK);

        /* Enable Marvell interrupts through Elmer0. */
        if (t1_is_asic(cphy->adapter)) {
                u32 elmer;

                t1_tpi_read(cphy->adapter, A_ELMER0_INT_ENABLE, &elmer);
                elmer |= ELMER0_GP_BIT1;
                if (is_T2(cphy->adapter))
                    elmer |= ELMER0_GP_BIT2 | ELMER0_GP_BIT3 | ELMER0_GP_BIT4;
                t1_tpi_write(cphy->adapter, A_ELMER0_INT_ENABLE, elmer);
        }
        return 0;
}

static int mv88e1xxx_interrupt_disable(struct cphy *cphy)
{
        /* Disable all phy interrupts. */
        (void) simple_mdio_write(cphy, MV88E1XXX_INTERRUPT_ENABLE_REGISTER, 0);

        /* Disable Marvell interrupts through Elmer0. */
        if (t1_is_asic(cphy->adapter)) {
                u32 elmer;

                t1_tpi_read(cphy->adapter, A_ELMER0_INT_ENABLE, &elmer);
                elmer &= ~ELMER0_GP_BIT1;
                if (is_T2(cphy->adapter))
                    elmer &= ~(ELMER0_GP_BIT2|ELMER0_GP_BIT3|ELMER0_GP_BIT4);
                t1_tpi_write(cphy->adapter, A_ELMER0_INT_ENABLE, elmer);
        }
        return 0;
}

static int mv88e1xxx_interrupt_clear(struct cphy *cphy)
{
        u32 elmer;

        /* Clear PHY interrupts by reading the register. */
        (void) simple_mdio_read(cphy,
                        MV88E1XXX_INTERRUPT_STATUS_REGISTER, &elmer);

        /* Clear Marvell interrupts through Elmer0. */
        if (t1_is_asic(cphy->adapter)) {
                t1_tpi_read(cphy->adapter, A_ELMER0_INT_CAUSE, &elmer);
                elmer |= ELMER0_GP_BIT1;
                if (is_T2(cphy->adapter))
                    elmer |= ELMER0_GP_BIT2|ELMER0_GP_BIT3|ELMER0_GP_BIT4;
                t1_tpi_write(cphy->adapter, A_ELMER0_INT_CAUSE, elmer);
        }
        return 0;
}

/*
 * Set the PHY speed and duplex.  This also disables auto-negotiation, except
 * for 1Gb/s, where auto-negotiation is mandatory.
 */
static int mv88e1xxx_set_speed_duplex(struct cphy *phy, int speed, int duplex)
{
        u32 ctl;

        (void) simple_mdio_read(phy, MII_BMCR, &ctl);
        if (speed >= 0) {
                ctl &= ~(BMCR_SPEED100 | BMCR_SPEED1000 | BMCR_ANENABLE);
                if (speed == SPEED_100)
                        ctl |= BMCR_SPEED100;
                else if (speed == SPEED_1000)
                        ctl |= BMCR_SPEED1000;
        }
        if (duplex >= 0) {
                ctl &= ~(BMCR_FULLDPLX | BMCR_ANENABLE);
                if (duplex == DUPLEX_FULL)
                        ctl |= BMCR_FULLDPLX;
        }
        if (ctl & BMCR_SPEED1000)  /* auto-negotiation required for 1Gb/s */
                ctl |= BMCR_ANENABLE;
        (void) simple_mdio_write(phy, MII_BMCR, ctl);
        return 0;
}

static int mv88e1xxx_crossover_set(struct cphy *cphy, int crossover)
{
        u32 data32;

        (void) simple_mdio_read(cphy,
                        MV88E1XXX_SPECIFIC_CNTRL_REGISTER, &data32);
        data32 &= ~V_PSCR_MDI_XOVER_MODE(M_PSCR_MDI_XOVER_MODE);
        data32 |= V_PSCR_MDI_XOVER_MODE(crossover);
        (void) simple_mdio_write(cphy,
                        MV88E1XXX_SPECIFIC_CNTRL_REGISTER, data32);
        return 0;
}

static int mv88e1xxx_autoneg_enable(struct cphy *cphy)
{
        u32 ctl;

        (void) mv88e1xxx_crossover_set(cphy, CROSSOVER_AUTO);

        (void) simple_mdio_read(cphy, MII_BMCR, &ctl);
        /* restart autoneg for change to take effect */
        ctl |= BMCR_ANENABLE | BMCR_ANRESTART;
        (void) simple_mdio_write(cphy, MII_BMCR, ctl);
        return 0;
}

static int mv88e1xxx_autoneg_disable(struct cphy *cphy)
{
        u32 ctl;

        /*
         * Crossover *must* be set to manual in order to disable auto-neg.
         * The Alaska FAQs document highlights this point.
         */
        (void) mv88e1xxx_crossover_set(cphy, CROSSOVER_MDI);

        /*
         * Must include autoneg reset when disabling auto-neg. This
         * is described in the Alaska FAQ document.
         */
        (void) simple_mdio_read(cphy, MII_BMCR, &ctl);
        ctl &= ~BMCR_ANENABLE;
        (void) simple_mdio_write(cphy, MII_BMCR, ctl | BMCR_ANRESTART);
        return 0;
}

static int mv88e1xxx_autoneg_restart(struct cphy *cphy)
{
        mdio_set_bit(cphy, MII_BMCR, BMCR_ANRESTART);
        return 0;
}

static int mv88e1xxx_advertise(struct cphy *phy, unsigned int advertise_map)
{
        u32 val = 0;

        if (advertise_map &
            (ADVERTISED_1000baseT_Half | ADVERTISED_1000baseT_Full)) {
                (void) simple_mdio_read(phy, MII_GBCR, &val);
                val &= ~(GBCR_ADV_1000HALF | GBCR_ADV_1000FULL);
                if (advertise_map & ADVERTISED_1000baseT_Half)
                        val |= GBCR_ADV_1000HALF;
                if (advertise_map & ADVERTISED_1000baseT_Full)
                        val |= GBCR_ADV_1000FULL;
        }
        (void) simple_mdio_write(phy, MII_GBCR, val);

        val = 1;
        if (advertise_map & ADVERTISED_10baseT_Half)
                val |= ADVERTISE_10HALF;
        if (advertise_map & ADVERTISED_10baseT_Full)
                val |= ADVERTISE_10FULL;
        if (advertise_map & ADVERTISED_100baseT_Half)
                val |= ADVERTISE_100HALF;
        if (advertise_map & ADVERTISED_100baseT_Full)
                val |= ADVERTISE_100FULL;
        if (advertise_map & ADVERTISED_PAUSE)
                val |= ADVERTISE_PAUSE;
        if (advertise_map & ADVERTISED_ASYM_PAUSE)
                val |= ADVERTISE_PAUSE_ASYM;
        (void) simple_mdio_write(phy, MII_ADVERTISE, val);
        return 0;
}

static int mv88e1xxx_set_loopback(struct cphy *cphy, int on)
{
        if (on)
                mdio_set_bit(cphy, MII_BMCR, BMCR_LOOPBACK);
        else
                mdio_clear_bit(cphy, MII_BMCR, BMCR_LOOPBACK);
        return 0;
}

static int mv88e1xxx_get_link_status(struct cphy *cphy, int *link_ok,
                                     int *speed, int *duplex, int *fc)
{
        u32 status;
        int sp = -1, dplx = -1, pause = 0;

        (void) simple_mdio_read(cphy,
                        MV88E1XXX_SPECIFIC_STATUS_REGISTER, &status);
        if ((status & V_PSSR_STATUS_RESOLVED) != 0) {
                if (status & V_PSSR_RX_PAUSE)
                        pause |= PAUSE_RX;
                if (status & V_PSSR_TX_PAUSE)
                        pause |= PAUSE_TX;
                dplx = (status & V_PSSR_DUPLEX) ? DUPLEX_FULL : DUPLEX_HALF;
                sp = G_PSSR_SPEED(status);
                if (sp == 0)
                        sp = SPEED_10;
                else if (sp == 1)
                        sp = SPEED_100;
                else
                        sp = SPEED_1000;
        }
        if (link_ok)
                *link_ok = (status & V_PSSR_LINK) != 0;
        if (speed)
                *speed = sp;
        if (duplex)
                *duplex = dplx;
        if (fc)
                *fc = pause;
        return 0;
}

static int mv88e1xxx_downshift_set(struct cphy *cphy, int downshift_enable)
{
        u32 val;

        (void) simple_mdio_read(cphy,
                MV88E1XXX_EXT_PHY_SPECIFIC_CNTRL_REGISTER, &val);

        /*
         * Set the downshift counter to 2 so we try to establish Gb link
         * twice before downshifting.
         */
        val &= ~(V_DOWNSHIFT_ENABLE | V_DOWNSHIFT_CNT(M_DOWNSHIFT_CNT));

        if (downshift_enable)
                val |= V_DOWNSHIFT_ENABLE | V_DOWNSHIFT_CNT(2);
        (void) simple_mdio_write(cphy,
                        MV88E1XXX_EXT_PHY_SPECIFIC_CNTRL_REGISTER, val);
        return 0;
}

static int mv88e1xxx_interrupt_handler(struct cphy *cphy)
{
        int cphy_cause = 0;
        u32 status;

        /*
         * Loop until cause reads zero. Need to handle bouncing interrupts.
         */
        while (1) {
                u32 cause;

                (void) simple_mdio_read(cphy,
                                MV88E1XXX_INTERRUPT_STATUS_REGISTER,
                                &cause);
                cause &= INTR_ENABLE_MASK;
                if (!cause)
                        break;

                if (cause & MV88E1XXX_INTR_LINK_CHNG) {
                        (void) simple_mdio_read(cphy,
                                MV88E1XXX_SPECIFIC_STATUS_REGISTER, &status);

                        if (status & MV88E1XXX_INTR_LINK_CHNG)
                                cphy->state |= PHY_LINK_UP;
                        else {
                                cphy->state &= ~PHY_LINK_UP;
                                if (cphy->state & PHY_AUTONEG_EN)
                                        cphy->state &= ~PHY_AUTONEG_RDY;
                                cphy_cause |= cphy_cause_link_change;
                        }
                }

                if (cause & MV88E1XXX_INTR_AUTONEG_DONE)
                        cphy->state |= PHY_AUTONEG_RDY;

                if ((cphy->state & (PHY_LINK_UP | PHY_AUTONEG_RDY)) ==
                        (PHY_LINK_UP | PHY_AUTONEG_RDY))
                                cphy_cause |= cphy_cause_link_change;
        }
        return cphy_cause;
}

static void mv88e1xxx_destroy(struct cphy *cphy)
{
        kfree(cphy);
}

static const struct cphy_ops mv88e1xxx_ops = {
        .destroy              = mv88e1xxx_destroy,
        .reset                = mv88e1xxx_reset,
        .interrupt_enable     = mv88e1xxx_interrupt_enable,
        .interrupt_disable    = mv88e1xxx_interrupt_disable,
        .interrupt_clear      = mv88e1xxx_interrupt_clear,
        .interrupt_handler    = mv88e1xxx_interrupt_handler,
        .autoneg_enable       = mv88e1xxx_autoneg_enable,
        .autoneg_disable      = mv88e1xxx_autoneg_disable,
        .autoneg_restart      = mv88e1xxx_autoneg_restart,
        .advertise            = mv88e1xxx_advertise,
        .set_loopback         = mv88e1xxx_set_loopback,
        .set_speed_duplex     = mv88e1xxx_set_speed_duplex,
        .get_link_status      = mv88e1xxx_get_link_status,
};

static struct cphy *mv88e1xxx_phy_create(struct net_device *dev, int phy_addr,
                                         const struct mdio_ops *mdio_ops)
{
        struct adapter *adapter = netdev_priv(dev);
        struct cphy *cphy = kzalloc_obj(*cphy);

        if (!cphy)
                return NULL;

        cphy_init(cphy, dev, phy_addr, &mv88e1xxx_ops, mdio_ops);

        /* Configure particular PHY's to run in a different mode. */
        if ((board_info(adapter)->caps & SUPPORTED_TP) &&
            board_info(adapter)->chip_phy == CHBT_PHY_88E1111) {
                /*
                 * Configure the PHY transmitter as class A to reduce EMI.
                 */
                (void) simple_mdio_write(cphy,
                                MV88E1XXX_EXTENDED_ADDR_REGISTER, 0xB);
                (void) simple_mdio_write(cphy,
                                MV88E1XXX_EXTENDED_REGISTER, 0x8004);
        }
        (void) mv88e1xxx_downshift_set(cphy, 1);   /* Enable downshift */

        /* LED */
        if (is_T2(adapter)) {
                (void) simple_mdio_write(cphy,
                                MV88E1XXX_LED_CONTROL_REGISTER, 0x1);
        }

        return cphy;
}

static int mv88e1xxx_phy_reset(adapter_t* adapter)
{
        return 0;
}

const struct gphy t1_mv88e1xxx_ops = {
        .create = mv88e1xxx_phy_create,
        .reset =  mv88e1xxx_phy_reset
};