drivers/net/ethernet/amd/xgbe/xgbe-mdio.c

root/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause)
/*
 * Copyright (c) 2014-2025, Advanced Micro Devices, Inc.
 * Copyright (c) 2014, Synopsys, Inc.
 * All rights reserved
 */

#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/mdio.h>
#include <linux/phy.h>
#include <linux/of.h>
#include <linux/bitops.h>
#include <linux/jiffies.h>

#include "xgbe.h"
#include "xgbe-common.h"

static int xgbe_phy_module_eeprom(struct xgbe_prv_data *pdata,
                                  struct ethtool_eeprom *eeprom, u8 *data)
{
        if (!pdata->phy_if.phy_impl.module_eeprom)
                return -ENXIO;

        return pdata->phy_if.phy_impl.module_eeprom(pdata, eeprom, data);
}

static int xgbe_phy_module_info(struct xgbe_prv_data *pdata,
                                struct ethtool_modinfo *modinfo)
{
        if (!pdata->phy_if.phy_impl.module_info)
                return -ENXIO;

        return pdata->phy_if.phy_impl.module_info(pdata, modinfo);
}

static void xgbe_an37_clear_interrupts(struct xgbe_prv_data *pdata)
{
        int reg;

        reg = XMDIO_READ(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_STAT);
        reg &= ~XGBE_AN_CL37_INT_MASK;
        XMDIO_WRITE(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_STAT, reg);
}

static void xgbe_an37_disable_interrupts(struct xgbe_prv_data *pdata)
{
        int reg;

        reg = XMDIO_READ(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_CTRL);
        reg &= ~XGBE_AN_CL37_INT_MASK;
        XMDIO_WRITE(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_CTRL, reg);

        reg = XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_PCS_DIG_CTRL);
        reg &= ~XGBE_PCS_CL37_BP;
        XMDIO_WRITE(pdata, MDIO_MMD_PCS, MDIO_PCS_DIG_CTRL, reg);
}

static void xgbe_an37_enable_interrupts(struct xgbe_prv_data *pdata)
{
        int reg;

        reg = XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_PCS_DIG_CTRL);
        reg |= XGBE_PCS_CL37_BP;
        XMDIO_WRITE(pdata, MDIO_MMD_PCS, MDIO_PCS_DIG_CTRL, reg);

        reg = XMDIO_READ(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_CTRL);
        reg |= XGBE_AN_CL37_INT_MASK;
        XMDIO_WRITE(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_CTRL, reg);
}

static void xgbe_an73_clear_interrupts(struct xgbe_prv_data *pdata)
{
        XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_AN_INT, 0);
}

static void xgbe_an73_disable_interrupts(struct xgbe_prv_data *pdata)
{
        XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_AN_INTMASK, 0);
}

static void xgbe_an73_enable_interrupts(struct xgbe_prv_data *pdata)
{
        XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_AN_INTMASK, XGBE_AN_CL73_INT_MASK);
}

static void xgbe_an_enable_interrupts(struct xgbe_prv_data *pdata)
{
        switch (pdata->an_mode) {
        case XGBE_AN_MODE_CL73:
        case XGBE_AN_MODE_CL73_REDRV:
                xgbe_an73_enable_interrupts(pdata);
                break;
        case XGBE_AN_MODE_CL37:
        case XGBE_AN_MODE_CL37_SGMII:
                xgbe_an37_enable_interrupts(pdata);
                break;
        default:
                break;
        }
}

static void xgbe_an_clear_interrupts_all(struct xgbe_prv_data *pdata)
{
        xgbe_an73_clear_interrupts(pdata);
        xgbe_an37_clear_interrupts(pdata);
}

static void xgbe_kr_mode(struct xgbe_prv_data *pdata)
{
        /* Set MAC to 10G speed */
        pdata->hw_if.set_speed(pdata, SPEED_10000);

        /* Call PHY implementation support to complete rate change */
        pdata->phy_if.phy_impl.set_mode(pdata, XGBE_MODE_KR);
}

static void xgbe_kx_2500_mode(struct xgbe_prv_data *pdata)
{
        /* Set MAC to 2.5G speed */
        pdata->hw_if.set_speed(pdata, SPEED_2500);

        /* Call PHY implementation support to complete rate change */
        pdata->phy_if.phy_impl.set_mode(pdata, XGBE_MODE_KX_2500);
}

static void xgbe_kx_1000_mode(struct xgbe_prv_data *pdata)
{
        /* Set MAC to 1G speed */
        pdata->hw_if.set_speed(pdata, SPEED_1000);

        /* Call PHY implementation support to complete rate change */
        pdata->phy_if.phy_impl.set_mode(pdata, XGBE_MODE_KX_1000);
}

static void xgbe_sfi_mode(struct xgbe_prv_data *pdata)
{
        /* If a KR re-driver is present, change to KR mode instead */
        if (pdata->kr_redrv)
                return xgbe_kr_mode(pdata);

        /* Set MAC to 10G speed */
        pdata->hw_if.set_speed(pdata, SPEED_10000);

        /* Call PHY implementation support to complete rate change */
        pdata->phy_if.phy_impl.set_mode(pdata, XGBE_MODE_SFI);
}

static void xgbe_x_mode(struct xgbe_prv_data *pdata)
{
        /* Set MAC to 1G speed */
        pdata->hw_if.set_speed(pdata, SPEED_1000);

        /* Call PHY implementation support to complete rate change */
        pdata->phy_if.phy_impl.set_mode(pdata, XGBE_MODE_X);
}

static void xgbe_sgmii_1000_mode(struct xgbe_prv_data *pdata)
{
        /* Set MAC to 1G speed */
        pdata->hw_if.set_speed(pdata, SPEED_1000);

        /* Call PHY implementation support to complete rate change */
        pdata->phy_if.phy_impl.set_mode(pdata, XGBE_MODE_SGMII_1000);
}

static void xgbe_sgmii_10_mode(struct xgbe_prv_data *pdata)
{
        /* Set MAC to 10M speed */
        pdata->hw_if.set_speed(pdata, SPEED_10);

        /* Call PHY implementation support to complete rate change */
        pdata->phy_if.phy_impl.set_mode(pdata, XGBE_MODE_SGMII_10);
}

static void xgbe_sgmii_100_mode(struct xgbe_prv_data *pdata)
{
        /* Set MAC to 1G speed */
        pdata->hw_if.set_speed(pdata, SPEED_1000);

        /* Call PHY implementation support to complete rate change */
        pdata->phy_if.phy_impl.set_mode(pdata, XGBE_MODE_SGMII_100);
}

static enum xgbe_mode xgbe_cur_mode(struct xgbe_prv_data *pdata)
{
        return pdata->phy_if.phy_impl.cur_mode(pdata);
}

static bool xgbe_in_kr_mode(struct xgbe_prv_data *pdata)
{
        return (xgbe_cur_mode(pdata) == XGBE_MODE_KR);
}

static void xgbe_change_mode(struct xgbe_prv_data *pdata,
                             enum xgbe_mode mode)
{
        switch (mode) {
        case XGBE_MODE_KX_1000:
                xgbe_kx_1000_mode(pdata);
                break;
        case XGBE_MODE_KX_2500:
                xgbe_kx_2500_mode(pdata);
                break;
        case XGBE_MODE_KR:
                xgbe_kr_mode(pdata);
                break;
        case XGBE_MODE_SGMII_10:
                xgbe_sgmii_10_mode(pdata);
                break;
        case XGBE_MODE_SGMII_100:
                xgbe_sgmii_100_mode(pdata);
                break;
        case XGBE_MODE_SGMII_1000:
                xgbe_sgmii_1000_mode(pdata);
                break;
        case XGBE_MODE_X:
                xgbe_x_mode(pdata);
                break;
        case XGBE_MODE_SFI:
                xgbe_sfi_mode(pdata);
                break;
        case XGBE_MODE_UNKNOWN:
                break;
        default:
                netif_dbg(pdata, link, pdata->netdev,
                          "invalid operation mode requested (%u)\n", mode);
        }
}

static void xgbe_switch_mode(struct xgbe_prv_data *pdata)
{
        xgbe_change_mode(pdata, pdata->phy_if.phy_impl.switch_mode(pdata));
}

static bool xgbe_set_mode(struct xgbe_prv_data *pdata,
                          enum xgbe_mode mode)
{
        if (mode == xgbe_cur_mode(pdata))
                return false;

        xgbe_change_mode(pdata, mode);

        return true;
}

static bool xgbe_use_mode(struct xgbe_prv_data *pdata,
                          enum xgbe_mode mode)
{
        return pdata->phy_if.phy_impl.use_mode(pdata, mode);
}

static void xgbe_an37_set(struct xgbe_prv_data *pdata, bool enable,
                          bool restart)
{
        unsigned int reg;

        reg = XMDIO_READ(pdata, MDIO_MMD_VEND2, MDIO_CTRL1);
        reg &= ~MDIO_VEND2_CTRL1_AN_ENABLE;

        if (enable)
                reg |= MDIO_VEND2_CTRL1_AN_ENABLE;

        if (restart)
                reg |= MDIO_VEND2_CTRL1_AN_RESTART;

        XMDIO_WRITE(pdata, MDIO_MMD_VEND2, MDIO_CTRL1, reg);

        reg = XMDIO_READ(pdata, MDIO_MMD_VEND2, MDIO_PCS_DIG_CTRL);
        reg |= XGBE_VEND2_MAC_AUTO_SW;
        XMDIO_WRITE(pdata, MDIO_MMD_VEND2, MDIO_PCS_DIG_CTRL, reg);
}

static void xgbe_an37_restart(struct xgbe_prv_data *pdata)
{
        xgbe_an37_enable_interrupts(pdata);
        xgbe_an37_set(pdata, true, true);

        netif_dbg(pdata, link, pdata->netdev, "CL37 AN enabled/restarted\n");
}

static void xgbe_an37_disable(struct xgbe_prv_data *pdata)
{
        xgbe_an37_set(pdata, false, false);
        xgbe_an37_disable_interrupts(pdata);

        netif_dbg(pdata, link, pdata->netdev, "CL37 AN disabled\n");
}

static void xgbe_an73_set(struct xgbe_prv_data *pdata, bool enable,
                          bool restart)
{
        unsigned int reg;

        /* Disable KR training for now */
        reg = XMDIO_READ(pdata, MDIO_MMD_PMAPMD, MDIO_PMA_10GBR_PMD_CTRL);
        reg &= ~XGBE_KR_TRAINING_ENABLE;
        XMDIO_WRITE(pdata, MDIO_MMD_PMAPMD, MDIO_PMA_10GBR_PMD_CTRL, reg);

        /* Update AN settings */
        reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_CTRL1);
        reg &= ~MDIO_AN_CTRL1_ENABLE;

        if (enable)
                reg |= MDIO_AN_CTRL1_ENABLE;

        if (restart)
                reg |= MDIO_AN_CTRL1_RESTART;

        XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_CTRL1, reg);
}

static void xgbe_an73_restart(struct xgbe_prv_data *pdata)
{
        xgbe_an73_enable_interrupts(pdata);
        xgbe_an73_set(pdata, true, true);

        netif_dbg(pdata, link, pdata->netdev, "CL73 AN enabled/restarted\n");
}

static void xgbe_an73_disable(struct xgbe_prv_data *pdata)
{
        xgbe_an73_set(pdata, false, false);
        xgbe_an73_disable_interrupts(pdata);

        pdata->an_start = 0;

        netif_dbg(pdata, link, pdata->netdev, "CL73 AN disabled\n");
}

static void xgbe_an_restart(struct xgbe_prv_data *pdata)
{
        if (pdata->phy_if.phy_impl.an_pre)
                pdata->phy_if.phy_impl.an_pre(pdata);

        switch (pdata->an_mode) {
        case XGBE_AN_MODE_CL73:
        case XGBE_AN_MODE_CL73_REDRV:
                xgbe_an73_restart(pdata);
                break;
        case XGBE_AN_MODE_CL37:
        case XGBE_AN_MODE_CL37_SGMII:
                xgbe_an37_restart(pdata);
                break;
        default:
                break;
        }
}

static void xgbe_an_disable(struct xgbe_prv_data *pdata)
{
        if (pdata->phy_if.phy_impl.an_post)
                pdata->phy_if.phy_impl.an_post(pdata);

        switch (pdata->an_mode) {
        case XGBE_AN_MODE_CL73:
        case XGBE_AN_MODE_CL73_REDRV:
                xgbe_an73_disable(pdata);
                break;
        case XGBE_AN_MODE_CL37:
        case XGBE_AN_MODE_CL37_SGMII:
                xgbe_an37_disable(pdata);
                break;
        default:
                break;
        }
}

static void xgbe_an_disable_all(struct xgbe_prv_data *pdata)
{
        xgbe_an73_disable(pdata);
        xgbe_an37_disable(pdata);
}

static enum xgbe_an xgbe_an73_tx_training(struct xgbe_prv_data *pdata,
                                          enum xgbe_rx *state)
{
        unsigned int ad_reg, lp_reg, reg;

        *state = XGBE_RX_COMPLETE;

        /* If we're not in KR mode then we're done */
        if (!xgbe_in_kr_mode(pdata))
                return XGBE_AN_PAGE_RECEIVED;

        /* Enable/Disable FEC */
        ad_reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE + 2);
        lp_reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_LPA + 2);

        reg = XMDIO_READ(pdata, MDIO_MMD_PMAPMD, MDIO_PMA_10GBR_FECCTRL);
        reg &= ~(MDIO_PMA_10GBR_FECABLE_ABLE | MDIO_PMA_10GBR_FECABLE_ERRABLE);
        if ((ad_reg & 0xc000) && (lp_reg & 0xc000))
                reg |= pdata->fec_ability;

        XMDIO_WRITE(pdata, MDIO_MMD_PMAPMD, MDIO_PMA_10GBR_FECCTRL, reg);

        /* Start KR training */
        if (pdata->phy_if.phy_impl.kr_training_pre)
                pdata->phy_if.phy_impl.kr_training_pre(pdata);

        reg = XMDIO_READ(pdata, MDIO_MMD_PMAPMD, MDIO_PMA_10GBR_PMD_CTRL);
        reg |= XGBE_KR_TRAINING_ENABLE;
        reg |= XGBE_KR_TRAINING_START;
        XMDIO_WRITE(pdata, MDIO_MMD_PMAPMD, MDIO_PMA_10GBR_PMD_CTRL, reg);
        pdata->kr_start_time = jiffies;

        netif_dbg(pdata, link, pdata->netdev,
                  "KR training initiated\n");

        if (pdata->phy_if.phy_impl.kr_training_post)
                pdata->phy_if.phy_impl.kr_training_post(pdata);

        return XGBE_AN_PAGE_RECEIVED;
}

static enum xgbe_an xgbe_an73_tx_xnp(struct xgbe_prv_data *pdata,
                                     enum xgbe_rx *state)
{
        u16 msg;

        *state = XGBE_RX_XNP;

        msg = XGBE_XNP_MCF_NULL_MESSAGE;
        msg |= XGBE_XNP_MP_FORMATTED;

        XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_AN_XNP + 2, 0);
        XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_AN_XNP + 1, 0);
        XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_AN_XNP, msg);

        return XGBE_AN_PAGE_RECEIVED;
}

static enum xgbe_an xgbe_an73_rx_bpa(struct xgbe_prv_data *pdata,
                                     enum xgbe_rx *state)
{
        unsigned int link_support;
        unsigned int reg, ad_reg, lp_reg;

        /* Read Base Ability register 2 first */
        reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_LPA + 1);

        /* Check for a supported mode, otherwise restart in a different one */
        link_support = xgbe_in_kr_mode(pdata) ? 0x80 : 0x20;
        if (!(reg & link_support))
                return XGBE_AN_INCOMPAT_LINK;

        /* Check Extended Next Page support */
        ad_reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE);
        lp_reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_LPA);

        return ((ad_reg & XGBE_XNP_NP_EXCHANGE) ||
                (lp_reg & XGBE_XNP_NP_EXCHANGE))
               ? xgbe_an73_tx_xnp(pdata, state)
               : xgbe_an73_tx_training(pdata, state);
}

static enum xgbe_an xgbe_an73_rx_xnp(struct xgbe_prv_data *pdata,
                                     enum xgbe_rx *state)
{
        unsigned int ad_reg, lp_reg;

        /* Check Extended Next Page support */
        ad_reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_XNP);
        lp_reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_LPX);

        return ((ad_reg & XGBE_XNP_NP_EXCHANGE) ||
                (lp_reg & XGBE_XNP_NP_EXCHANGE))
               ? xgbe_an73_tx_xnp(pdata, state)
               : xgbe_an73_tx_training(pdata, state);
}

static enum xgbe_an xgbe_an73_page_received(struct xgbe_prv_data *pdata)
{
        enum xgbe_rx *state;
        unsigned long an_timeout;
        enum xgbe_an ret;

        if (!pdata->an_start) {
                pdata->an_start = jiffies;
        } else {
                an_timeout = pdata->an_start +
                             msecs_to_jiffies(XGBE_AN_MS_TIMEOUT);
                if (time_after(jiffies, an_timeout)) {
                        /* Auto-negotiation timed out, reset state */
                        pdata->kr_state = XGBE_RX_BPA;
                        pdata->kx_state = XGBE_RX_BPA;

                        pdata->an_start = jiffies;

                        netif_dbg(pdata, link, pdata->netdev,
                                  "CL73 AN timed out, resetting state\n");
                }
        }

        state = xgbe_in_kr_mode(pdata) ? &pdata->kr_state
                                       : &pdata->kx_state;

        switch (*state) {
        case XGBE_RX_BPA:
                ret = xgbe_an73_rx_bpa(pdata, state);
                break;

        case XGBE_RX_XNP:
                ret = xgbe_an73_rx_xnp(pdata, state);
                break;

        default:
                ret = XGBE_AN_ERROR;
        }

        return ret;
}

static enum xgbe_an xgbe_an73_incompat_link(struct xgbe_prv_data *pdata)
{
        struct ethtool_link_ksettings *lks = &pdata->phy.lks;

        /* Be sure we aren't looping trying to negotiate */
        if (xgbe_in_kr_mode(pdata)) {
                pdata->kr_state = XGBE_RX_ERROR;

                if (!XGBE_ADV(lks, 1000baseKX_Full) &&
                    !XGBE_ADV(lks, 2500baseX_Full))
                        return XGBE_AN_NO_LINK;

                if (pdata->kx_state != XGBE_RX_BPA)
                        return XGBE_AN_NO_LINK;
        } else {
                pdata->kx_state = XGBE_RX_ERROR;

                if (!XGBE_ADV(lks, 10000baseKR_Full))
                        return XGBE_AN_NO_LINK;

                if (pdata->kr_state != XGBE_RX_BPA)
                        return XGBE_AN_NO_LINK;
        }

        xgbe_an_disable(pdata);

        xgbe_switch_mode(pdata);

        pdata->an_result = XGBE_AN_READY;

        xgbe_an_restart(pdata);

        return XGBE_AN_INCOMPAT_LINK;
}

static void xgbe_an37_isr(struct xgbe_prv_data *pdata)
{
        unsigned int reg;

        /* Disable AN interrupts */
        xgbe_an37_disable_interrupts(pdata);

        /* Save the interrupt(s) that fired */
        reg = XMDIO_READ(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_STAT);
        pdata->an_int = reg & XGBE_AN_CL37_INT_MASK;
        pdata->an_status = reg & ~XGBE_AN_CL37_INT_MASK;

        if (pdata->an_int) {
                /* Clear the interrupt(s) that fired and process them */
                reg &= ~XGBE_AN_CL37_INT_MASK;
                XMDIO_WRITE(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_STAT, reg);

                queue_work(pdata->an_workqueue, &pdata->an_irq_work);
        } else {
                /* Enable AN interrupts */
                xgbe_an37_enable_interrupts(pdata);

                /* Reissue interrupt if status is not clear */
                if (pdata->vdata->irq_reissue_support)
                        XP_IOWRITE(pdata, XP_INT_REISSUE_EN, 1 << 3);
        }
}

static void xgbe_an73_isr(struct xgbe_prv_data *pdata)
{
        /* Disable AN interrupts */
        xgbe_an73_disable_interrupts(pdata);

        /* Save the interrupt(s) that fired */
        pdata->an_int = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_INT);

        if (pdata->an_int) {
                /* Clear the interrupt(s) that fired and process them */
                XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_AN_INT, ~pdata->an_int);

                queue_work(pdata->an_workqueue, &pdata->an_irq_work);
        } else {
                /* Enable AN interrupts */
                xgbe_an73_enable_interrupts(pdata);

                /* Reissue interrupt if status is not clear */
                if (pdata->vdata->irq_reissue_support)
                        XP_IOWRITE(pdata, XP_INT_REISSUE_EN, 1 << 3);
        }
}

static void xgbe_an_isr_bh_work(struct work_struct *work)
{
        struct xgbe_prv_data *pdata = from_work(pdata, work, an_bh_work);

        netif_dbg(pdata, intr, pdata->netdev, "AN interrupt received\n");

        switch (pdata->an_mode) {
        case XGBE_AN_MODE_CL73:
        case XGBE_AN_MODE_CL73_REDRV:
                xgbe_an73_isr(pdata);
                break;
        case XGBE_AN_MODE_CL37:
        case XGBE_AN_MODE_CL37_SGMII:
                xgbe_an37_isr(pdata);
                break;
        default:
                break;
        }
}

static irqreturn_t xgbe_an_isr(int irq, void *data)
{
        struct xgbe_prv_data *pdata = (struct xgbe_prv_data *)data;

        if (pdata->isr_as_bh_work)
                queue_work(system_bh_wq, &pdata->an_bh_work);
        else
                xgbe_an_isr_bh_work(&pdata->an_bh_work);

        return IRQ_HANDLED;
}

static irqreturn_t xgbe_an_combined_isr(struct xgbe_prv_data *pdata)
{
        xgbe_an_isr_bh_work(&pdata->an_bh_work);

        return IRQ_HANDLED;
}

static void xgbe_an_irq_work(struct work_struct *work)
{
        struct xgbe_prv_data *pdata = container_of(work,
                                                   struct xgbe_prv_data,
                                                   an_irq_work);

        /* Avoid a race between enabling the IRQ and exiting the work by
         * waiting for the work to finish and then queueing it
         */
        flush_work(&pdata->an_work);
        queue_work(pdata->an_workqueue, &pdata->an_work);
}

static const char *xgbe_state_as_string(enum xgbe_an state)
{
        switch (state) {
        case XGBE_AN_READY:
                return "Ready";
        case XGBE_AN_PAGE_RECEIVED:
                return "Page-Received";
        case XGBE_AN_INCOMPAT_LINK:
                return "Incompatible-Link";
        case XGBE_AN_COMPLETE:
                return "Complete";
        case XGBE_AN_NO_LINK:
                return "No-Link";
        case XGBE_AN_ERROR:
                return "Error";
        default:
                return "Undefined";
        }
}

static void xgbe_an37_state_machine(struct xgbe_prv_data *pdata)
{
        enum xgbe_an cur_state = pdata->an_state;

        if (!pdata->an_int)
                return;

        if (pdata->an_int & XGBE_AN_CL37_INT_CMPLT) {
                pdata->an_state = XGBE_AN_COMPLETE;
                pdata->an_int &= ~XGBE_AN_CL37_INT_CMPLT;

                /* If SGMII is enabled, check the link status */
                if ((pdata->an_mode == XGBE_AN_MODE_CL37_SGMII) &&
                    !(pdata->an_status & XGBE_SGMII_AN_LINK_STATUS))
                        pdata->an_state = XGBE_AN_NO_LINK;
        }

        netif_dbg(pdata, link, pdata->netdev, "CL37 AN %s\n",
                  xgbe_state_as_string(pdata->an_state));

        cur_state = pdata->an_state;

        switch (pdata->an_state) {
        case XGBE_AN_READY:
                break;

        case XGBE_AN_COMPLETE:
                netif_dbg(pdata, link, pdata->netdev,
                          "Auto negotiation successful\n");
                break;

        case XGBE_AN_NO_LINK:
                break;

        default:
                pdata->an_state = XGBE_AN_ERROR;
        }

        if (pdata->an_state == XGBE_AN_ERROR) {
                netdev_err(pdata->netdev,
                           "error during auto-negotiation, state=%u\n",
                           cur_state);

                pdata->an_int = 0;
                xgbe_an37_clear_interrupts(pdata);
        }

        if (pdata->an_state >= XGBE_AN_COMPLETE) {
                pdata->an_result = pdata->an_state;
                pdata->an_state = XGBE_AN_READY;

                if (pdata->phy_if.phy_impl.an_post)
                        pdata->phy_if.phy_impl.an_post(pdata);

                netif_dbg(pdata, link, pdata->netdev, "CL37 AN result: %s\n",
                          xgbe_state_as_string(pdata->an_result));
        }

        xgbe_an37_enable_interrupts(pdata);
}

static void xgbe_an73_state_machine(struct xgbe_prv_data *pdata)
{
        enum xgbe_an cur_state = pdata->an_state;

        if (!pdata->an_int)
                return;

next_int:
        if (pdata->an_int & XGBE_AN_CL73_PG_RCV) {
                pdata->an_state = XGBE_AN_PAGE_RECEIVED;
                pdata->an_int &= ~XGBE_AN_CL73_PG_RCV;
        } else if (pdata->an_int & XGBE_AN_CL73_INC_LINK) {
                pdata->an_state = XGBE_AN_INCOMPAT_LINK;
                pdata->an_int &= ~XGBE_AN_CL73_INC_LINK;
        } else if (pdata->an_int & XGBE_AN_CL73_INT_CMPLT) {
                pdata->an_state = XGBE_AN_COMPLETE;
                pdata->an_int &= ~XGBE_AN_CL73_INT_CMPLT;
        } else {
                pdata->an_state = XGBE_AN_ERROR;
        }

again:
        netif_dbg(pdata, link, pdata->netdev, "CL73 AN %s\n",
                  xgbe_state_as_string(pdata->an_state));

        cur_state = pdata->an_state;

        switch (pdata->an_state) {
        case XGBE_AN_READY:
                pdata->an_supported = 0;
                break;

        case XGBE_AN_PAGE_RECEIVED:
                pdata->an_state = xgbe_an73_page_received(pdata);
                pdata->an_supported++;
                break;

        case XGBE_AN_INCOMPAT_LINK:
                pdata->an_supported = 0;
                pdata->parallel_detect = 0;
                pdata->an_state = xgbe_an73_incompat_link(pdata);
                break;

        case XGBE_AN_COMPLETE:
                pdata->parallel_detect = pdata->an_supported ? 0 : 1;
                netif_dbg(pdata, link, pdata->netdev, "%s successful\n",
                          pdata->an_supported ? "Auto negotiation"
                                              : "Parallel detection");
                break;

        case XGBE_AN_NO_LINK:
                break;

        default:
                pdata->an_state = XGBE_AN_ERROR;
        }

        if (pdata->an_state == XGBE_AN_NO_LINK) {
                pdata->an_int = 0;
                xgbe_an73_clear_interrupts(pdata);
        } else if (pdata->an_state == XGBE_AN_ERROR) {
                netdev_err(pdata->netdev,
                           "error during auto-negotiation, state=%u\n",
                           cur_state);

                pdata->an_int = 0;
                xgbe_an73_clear_interrupts(pdata);
        }

        if (pdata->an_state >= XGBE_AN_COMPLETE) {
                pdata->an_result = pdata->an_state;
                pdata->an_state = XGBE_AN_READY;
                pdata->kr_state = XGBE_RX_BPA;
                pdata->kx_state = XGBE_RX_BPA;
                pdata->an_start = 0;

                if (pdata->phy_if.phy_impl.an_post)
                        pdata->phy_if.phy_impl.an_post(pdata);

                netif_dbg(pdata, link, pdata->netdev, "CL73 AN result: %s\n",
                          xgbe_state_as_string(pdata->an_result));
        }

        if (cur_state != pdata->an_state)
                goto again;

        if (pdata->an_int)
                goto next_int;

        xgbe_an73_enable_interrupts(pdata);
}

static void xgbe_an_state_machine(struct work_struct *work)
{
        struct xgbe_prv_data *pdata = container_of(work,
                                                   struct xgbe_prv_data,
                                                   an_work);

        mutex_lock(&pdata->an_mutex);

        switch (pdata->an_mode) {
        case XGBE_AN_MODE_CL73:
        case XGBE_AN_MODE_CL73_REDRV:
                xgbe_an73_state_machine(pdata);
                break;
        case XGBE_AN_MODE_CL37:
        case XGBE_AN_MODE_CL37_SGMII:
                xgbe_an37_state_machine(pdata);
                break;
        default:
                break;
        }

        /* Reissue interrupt if status is not clear */
        if (pdata->vdata->irq_reissue_support)
                XP_IOWRITE(pdata, XP_INT_REISSUE_EN, 1 << 3);

        mutex_unlock(&pdata->an_mutex);
}

static void xgbe_an37_init(struct xgbe_prv_data *pdata)
{
        struct ethtool_link_ksettings lks;
        unsigned int reg;

        pdata->phy_if.phy_impl.an_advertising(pdata, &lks);

        /* Set up Advertisement register */
        reg = XMDIO_READ(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_ADVERTISE);
        if (XGBE_ADV(&lks, Pause))
                reg |= 0x100;
        else
                reg &= ~0x100;

        if (XGBE_ADV(&lks, Asym_Pause))
                reg |= 0x80;
        else
                reg &= ~0x80;

        /* Full duplex, but not half */
        reg |= XGBE_AN_CL37_FD_MASK;
        reg &= ~XGBE_AN_CL37_HD_MASK;

        XMDIO_WRITE(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_ADVERTISE, reg);

        /* Set up the Control register */
        reg = XMDIO_READ(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_CTRL);
        reg &= ~XGBE_AN_CL37_TX_CONFIG_MASK;
        reg &= ~XGBE_AN_CL37_PCS_MODE_MASK;

        switch (pdata->an_mode) {
        case XGBE_AN_MODE_CL37:
                reg |= XGBE_AN_CL37_PCS_MODE_BASEX;
                break;
        case XGBE_AN_MODE_CL37_SGMII:
                reg |= XGBE_AN_CL37_PCS_MODE_SGMII;
                break;
        default:
                break;
        }

        reg |= XGBE_AN_CL37_MII_CTRL_8BIT;

        XMDIO_WRITE(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_CTRL, reg);

        netif_dbg(pdata, link, pdata->netdev, "CL37 AN (%s) initialized\n",
                  (pdata->an_mode == XGBE_AN_MODE_CL37) ? "BaseX" : "SGMII");

        reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_CTRL1);
        reg &= ~MDIO_AN_CTRL1_ENABLE;
        XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_CTRL1, reg);

}

static void xgbe_an73_init(struct xgbe_prv_data *pdata)
{
        struct ethtool_link_ksettings lks;
        unsigned int reg;

        pdata->phy_if.phy_impl.an_advertising(pdata, &lks);

        /* Set up Advertisement register 3 first */
        reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE + 2);
        if (XGBE_ADV(&lks, 10000baseR_FEC))
                reg |= 0xc000;
        else
                reg &= ~0xc000;

        XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE + 2, reg);

        /* Set up Advertisement register 2 next */
        reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE + 1);
        if (XGBE_ADV(&lks, 10000baseKR_Full))
                reg |= 0x80;
        else
                reg &= ~0x80;

        if (XGBE_ADV(&lks, 1000baseKX_Full) ||
            XGBE_ADV(&lks, 2500baseX_Full))
                reg |= 0x20;
        else
                reg &= ~0x20;

        XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE + 1, reg);

        /* Set up Advertisement register 1 last */
        reg = XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE);
        if (XGBE_ADV(&lks, Pause))
                reg |= 0x400;
        else
                reg &= ~0x400;

        if (XGBE_ADV(&lks, Asym_Pause))
                reg |= 0x800;
        else
                reg &= ~0x800;

        /* We don't intend to perform XNP */
        reg &= ~XGBE_XNP_NP_EXCHANGE;

        XMDIO_WRITE(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);

        netif_dbg(pdata, link, pdata->netdev, "CL73 AN initialized\n");
}

static void xgbe_an_init(struct xgbe_prv_data *pdata)
{
        /* Set up advertisement registers based on current settings */
        pdata->an_mode = pdata->phy_if.phy_impl.an_mode(pdata);
        switch (pdata->an_mode) {
        case XGBE_AN_MODE_CL73:
        case XGBE_AN_MODE_CL73_REDRV:
                xgbe_an73_init(pdata);
                break;
        case XGBE_AN_MODE_CL37:
        case XGBE_AN_MODE_CL37_SGMII:
                xgbe_an37_init(pdata);
                break;
        default:
                break;
        }
}

static const char *xgbe_phy_fc_string(struct xgbe_prv_data *pdata)
{
        if (pdata->tx_pause && pdata->rx_pause)
                return "rx/tx";
        else if (pdata->rx_pause)
                return "rx";
        else if (pdata->tx_pause)
                return "tx";
        else
                return "off";
}

static const char *xgbe_phy_speed_string(int speed)
{
        switch (speed) {
        case SPEED_10:
                return "10Mbps";
        case SPEED_100:
                return "100Mbps";
        case SPEED_1000:
                return "1Gbps";
        case SPEED_2500:
                return "2.5Gbps";
        case SPEED_10000:
                return "10Gbps";
        case SPEED_UNKNOWN:
                return "Unknown";
        default:
                return "Unsupported";
        }
}

static void xgbe_phy_print_status(struct xgbe_prv_data *pdata)
{
        if (pdata->phy.link)
                netdev_info(pdata->netdev,
                            "Link is Up - %s/%s - flow control %s\n",
                            xgbe_phy_speed_string(pdata->phy.speed),
                            pdata->phy.duplex == DUPLEX_FULL ? "Full" : "Half",
                            xgbe_phy_fc_string(pdata));
        else
                netdev_info(pdata->netdev, "Link is Down\n");
}

static void xgbe_phy_adjust_link(struct xgbe_prv_data *pdata)
{
        int new_state = 0;

        if (pdata->phy.link) {
                /* Flow control support */
                pdata->pause_autoneg = pdata->phy.pause_autoneg;

                if (pdata->tx_pause != pdata->phy.tx_pause) {
                        new_state = 1;
                        pdata->tx_pause = pdata->phy.tx_pause;
                        pdata->hw_if.config_tx_flow_control(pdata);
                }

                if (pdata->rx_pause != pdata->phy.rx_pause) {
                        new_state = 1;
                        pdata->rx_pause = pdata->phy.rx_pause;
                        pdata->hw_if.config_rx_flow_control(pdata);
                }

                /* Speed support */
                if (pdata->phy_speed != pdata->phy.speed) {
                        new_state = 1;
                        pdata->phy_speed = pdata->phy.speed;
                }

                if (pdata->phy_link != pdata->phy.link) {
                        new_state = 1;
                        pdata->phy_link = pdata->phy.link;
                }
        } else if (pdata->phy_link) {
                new_state = 1;
                pdata->phy_link = 0;
                pdata->phy_speed = SPEED_UNKNOWN;
        }

        if (new_state && netif_msg_link(pdata))
                xgbe_phy_print_status(pdata);
}

static bool xgbe_phy_valid_speed(struct xgbe_prv_data *pdata, int speed)
{
        return pdata->phy_if.phy_impl.valid_speed(pdata, speed);
}

static int xgbe_phy_config_fixed(struct xgbe_prv_data *pdata)
{
        enum xgbe_mode mode;

        netif_dbg(pdata, link, pdata->netdev, "fixed PHY configuration\n");

        /* Disable auto-negotiation */
        xgbe_an_disable(pdata);

        /* Set specified mode for specified speed */
        mode = pdata->phy_if.phy_impl.get_mode(pdata, pdata->phy.speed);
        switch (mode) {
        case XGBE_MODE_KX_1000:
        case XGBE_MODE_KX_2500:
        case XGBE_MODE_KR:
        case XGBE_MODE_SGMII_10:
        case XGBE_MODE_SGMII_100:
        case XGBE_MODE_SGMII_1000:
        case XGBE_MODE_X:
        case XGBE_MODE_SFI:
                break;
        case XGBE_MODE_UNKNOWN:
        default:
                return -EINVAL;
        }

        /* Validate duplex mode */
        if (pdata->phy.duplex != DUPLEX_FULL)
                return -EINVAL;

        /* Force the mode change for SFI in Fixed PHY config.
         * Fixed PHY configs needs PLL to be enabled while doing mode set.
         * When the SFP module isn't connected during boot, driver assumes
         * AN is ON and attempts autonegotiation. However, if the connected
         * SFP comes up in Fixed PHY config, the link will not come up as
         * PLL isn't enabled while the initial mode set command is issued.
         * So, force the mode change for SFI in Fixed PHY configuration to
         * fix link issues.
         */
        if (mode == XGBE_MODE_SFI)
                xgbe_change_mode(pdata, mode);
        else
                xgbe_set_mode(pdata, mode);

        return 0;
}

static int __xgbe_phy_config_aneg(struct xgbe_prv_data *pdata, bool set_mode)
{
        int ret;

        mutex_lock(&pdata->an_mutex);

        set_bit(XGBE_LINK_INIT, &pdata->dev_state);
        pdata->link_check = jiffies;

        ret = pdata->phy_if.phy_impl.an_config(pdata);
        if (ret)
                goto out;

        if (pdata->phy.autoneg != AUTONEG_ENABLE) {
                ret = xgbe_phy_config_fixed(pdata);
                if (ret || !pdata->kr_redrv)
                        goto out;

                netif_dbg(pdata, link, pdata->netdev, "AN redriver support\n");
        } else {
                netif_dbg(pdata, link, pdata->netdev, "AN PHY configuration\n");
        }

        /* Disable auto-negotiation interrupt */
        disable_irq(pdata->an_irq);

        if (set_mode) {
                /* Start auto-negotiation in a supported mode */
                if (xgbe_use_mode(pdata, XGBE_MODE_KR)) {
                        xgbe_set_mode(pdata, XGBE_MODE_KR);
                } else if (xgbe_use_mode(pdata, XGBE_MODE_KX_2500)) {
                        xgbe_set_mode(pdata, XGBE_MODE_KX_2500);
                } else if (xgbe_use_mode(pdata, XGBE_MODE_KX_1000)) {
                        xgbe_set_mode(pdata, XGBE_MODE_KX_1000);
                } else if (xgbe_use_mode(pdata, XGBE_MODE_SFI)) {
                        xgbe_set_mode(pdata, XGBE_MODE_SFI);
                } else if (xgbe_use_mode(pdata, XGBE_MODE_X)) {
                        xgbe_set_mode(pdata, XGBE_MODE_X);
                } else if (xgbe_use_mode(pdata, XGBE_MODE_SGMII_1000)) {
                        xgbe_set_mode(pdata, XGBE_MODE_SGMII_1000);
                } else if (xgbe_use_mode(pdata, XGBE_MODE_SGMII_100)) {
                        xgbe_set_mode(pdata, XGBE_MODE_SGMII_100);
                } else if (xgbe_use_mode(pdata, XGBE_MODE_SGMII_10)) {
                        xgbe_set_mode(pdata, XGBE_MODE_SGMII_10);
                } else {
                        enable_irq(pdata->an_irq);
                        ret = -EINVAL;
                        goto out;
                }
        }

        /* Disable and stop any in progress auto-negotiation */
        xgbe_an_disable_all(pdata);

        /* Clear any auto-negotitation interrupts */
        xgbe_an_clear_interrupts_all(pdata);

        pdata->an_result = XGBE_AN_READY;
        pdata->an_state = XGBE_AN_READY;
        pdata->kr_state = XGBE_RX_BPA;
        pdata->kx_state = XGBE_RX_BPA;

        /* Re-enable auto-negotiation interrupt */
        enable_irq(pdata->an_irq);

        xgbe_an_init(pdata);
        xgbe_an_restart(pdata);

out:
        if (ret)
                set_bit(XGBE_LINK_ERR, &pdata->dev_state);
        else
                clear_bit(XGBE_LINK_ERR, &pdata->dev_state);

        mutex_unlock(&pdata->an_mutex);

        return ret;
}

static int xgbe_phy_config_aneg(struct xgbe_prv_data *pdata)
{
        return __xgbe_phy_config_aneg(pdata, true);
}

static int xgbe_phy_reconfig_aneg(struct xgbe_prv_data *pdata)
{
        return __xgbe_phy_config_aneg(pdata, false);
}

static bool xgbe_phy_aneg_done(struct xgbe_prv_data *pdata)
{
        return (pdata->an_result == XGBE_AN_COMPLETE);
}

static void xgbe_check_link_timeout(struct xgbe_prv_data *pdata)
{
        unsigned long link_timeout;
        unsigned long kr_time;
        int wait;

        link_timeout = pdata->link_check + (XGBE_LINK_TIMEOUT * HZ);
        if (time_after(jiffies, link_timeout)) {
                if ((xgbe_cur_mode(pdata) == XGBE_MODE_KR) &&
                    pdata->phy.autoneg == AUTONEG_ENABLE) {
                        /* AN restart should not happen while KR training is in progress.
                         * The while loop ensures no AN restart during KR training,
                         * waits up to 500ms and AN restart is triggered only if KR
                         * training is failed.
                         */
                        wait = XGBE_KR_TRAINING_WAIT_ITER;
                        while (wait--) {
                                kr_time = pdata->kr_start_time +
                                          msecs_to_jiffies(XGBE_AN_MS_TIMEOUT);
                                if (time_after(jiffies, kr_time))
                                        break;
                                /* AN restart is not required, if AN result is COMPLETE */
                                if (pdata->an_result == XGBE_AN_COMPLETE)
                                        return;
                                usleep_range(10000, 11000);
                        }
                }
                netif_dbg(pdata, link, pdata->netdev, "AN link timeout\n");
                xgbe_phy_config_aneg(pdata);
        }
}

static enum xgbe_mode xgbe_phy_status_aneg(struct xgbe_prv_data *pdata)
{
        return pdata->phy_if.phy_impl.an_outcome(pdata);
}

static bool xgbe_phy_status_result(struct xgbe_prv_data *pdata)
{
        struct ethtool_link_ksettings *lks = &pdata->phy.lks;
        enum xgbe_mode mode;

        XGBE_ZERO_LP_ADV(lks);

        if ((pdata->phy.autoneg != AUTONEG_ENABLE) || pdata->parallel_detect)
                mode = xgbe_cur_mode(pdata);
        else
                mode = xgbe_phy_status_aneg(pdata);

        switch (mode) {
        case XGBE_MODE_SGMII_10:
                pdata->phy.speed = SPEED_10;
                break;
        case XGBE_MODE_SGMII_100:
                pdata->phy.speed = SPEED_100;
                break;
        case XGBE_MODE_X:
        case XGBE_MODE_KX_1000:
        case XGBE_MODE_SGMII_1000:
                pdata->phy.speed = SPEED_1000;
                break;
        case XGBE_MODE_KX_2500:
                pdata->phy.speed = SPEED_2500;
                break;
        case XGBE_MODE_KR:
        case XGBE_MODE_SFI:
                pdata->phy.speed = SPEED_10000;
                break;
        case XGBE_MODE_UNKNOWN:
        default:
                pdata->phy.speed = SPEED_UNKNOWN;
        }

        pdata->phy.duplex = DUPLEX_FULL;

        if (!xgbe_set_mode(pdata, mode))
                return false;

        if (pdata->an_again)
                xgbe_phy_reconfig_aneg(pdata);

        return true;
}

static void xgbe_phy_status(struct xgbe_prv_data *pdata)
{
        unsigned int link_aneg;
        int an_restart;

        if (test_bit(XGBE_LINK_ERR, &pdata->dev_state)) {
                netif_carrier_off(pdata->netdev);

                pdata->phy.link = 0;
                goto adjust_link;
        }

        link_aneg = (pdata->phy.autoneg == AUTONEG_ENABLE);

        pdata->phy.link = pdata->phy_if.phy_impl.link_status(pdata,
                                                             &an_restart);
        /* bail out if the link status register read fails */
        if (pdata->phy.link < 0)
                return;

        if (an_restart) {
                xgbe_phy_config_aneg(pdata);
                goto adjust_link;
        }

        if (pdata->phy.link) {
                if (link_aneg && !xgbe_phy_aneg_done(pdata)) {
                        xgbe_check_link_timeout(pdata);
                        return;
                }

                if (xgbe_phy_status_result(pdata))
                        return;

                if (test_bit(XGBE_LINK_INIT, &pdata->dev_state))
                        clear_bit(XGBE_LINK_INIT, &pdata->dev_state);

                netif_carrier_on(pdata->netdev);
        } else {
                if (test_bit(XGBE_LINK_INIT, &pdata->dev_state)) {
                        xgbe_check_link_timeout(pdata);

                        if (link_aneg)
                                return;
                }

                xgbe_phy_status_result(pdata);

                netif_carrier_off(pdata->netdev);
        }

adjust_link:
        xgbe_phy_adjust_link(pdata);
}

static void xgbe_phy_stop(struct xgbe_prv_data *pdata)
{
        netif_dbg(pdata, link, pdata->netdev, "stopping PHY\n");

        if (!pdata->phy_started)
                return;

        /* Indicate the PHY is down */
        pdata->phy_started = 0;

        /* Disable auto-negotiation */
        xgbe_an_disable_all(pdata);

        if (pdata->dev_irq != pdata->an_irq) {
                devm_free_irq(pdata->dev, pdata->an_irq, pdata);
                cancel_work_sync(&pdata->an_bh_work);
        }

        pdata->phy_if.phy_impl.stop(pdata);

        pdata->phy.link = 0;

        xgbe_phy_adjust_link(pdata);
}

static int xgbe_phy_start(struct xgbe_prv_data *pdata)
{
        struct net_device *netdev = pdata->netdev;
        int ret;

        netif_dbg(pdata, link, pdata->netdev, "starting PHY\n");

        ret = pdata->phy_if.phy_impl.start(pdata);
        if (ret)
                return ret;

        /* If we have a separate AN irq, enable it */
        if (pdata->dev_irq != pdata->an_irq) {
                INIT_WORK(&pdata->an_bh_work, xgbe_an_isr_bh_work);

                ret = devm_request_irq(pdata->dev, pdata->an_irq,
                                       xgbe_an_isr, 0, pdata->an_name,
                                       pdata);
                if (ret) {
                        netdev_err(netdev, "phy irq request failed\n");
                        goto err_stop;
                }
        }

        /* Set initial mode - call the mode setting routines
         * directly to insure we are properly configured
         */
        if (xgbe_use_mode(pdata, XGBE_MODE_KR)) {
                xgbe_kr_mode(pdata);
        } else if (xgbe_use_mode(pdata, XGBE_MODE_KX_2500)) {
                xgbe_kx_2500_mode(pdata);
        } else if (xgbe_use_mode(pdata, XGBE_MODE_KX_1000)) {
                xgbe_kx_1000_mode(pdata);
        } else if (xgbe_use_mode(pdata, XGBE_MODE_SFI)) {
                xgbe_sfi_mode(pdata);
        } else if (xgbe_use_mode(pdata, XGBE_MODE_X)) {
                xgbe_x_mode(pdata);
        } else if (xgbe_use_mode(pdata, XGBE_MODE_SGMII_1000)) {
                xgbe_sgmii_1000_mode(pdata);
        } else if (xgbe_use_mode(pdata, XGBE_MODE_SGMII_100)) {
                xgbe_sgmii_100_mode(pdata);
        } else if (xgbe_use_mode(pdata, XGBE_MODE_SGMII_10)) {
                xgbe_sgmii_10_mode(pdata);
        } else {
                ret = -EINVAL;
                goto err_irq;
        }

        /* Indicate the PHY is up and running */
        pdata->phy_started = 1;

        xgbe_an_init(pdata);
        xgbe_an_enable_interrupts(pdata);

        return xgbe_phy_config_aneg(pdata);

err_irq:
        if (pdata->dev_irq != pdata->an_irq)
                devm_free_irq(pdata->dev, pdata->an_irq, pdata);

err_stop:
        pdata->phy_if.phy_impl.stop(pdata);

        return ret;
}

static int xgbe_phy_reset(struct xgbe_prv_data *pdata)
{
        int ret;

        ret = pdata->phy_if.phy_impl.reset(pdata);
        if (ret)
                return ret;

        /* Disable auto-negotiation for now */
        xgbe_an_disable_all(pdata);

        /* Clear auto-negotiation interrupts */
        xgbe_an_clear_interrupts_all(pdata);

        return 0;
}

static void xgbe_dump_phy_registers(struct xgbe_prv_data *pdata)
{
        struct device *dev = pdata->dev;

        dev_dbg(dev, "\n************* PHY Reg dump **********************\n");

        dev_dbg(dev, "PCS Control Reg (%#06x) = %#06x\n", MDIO_CTRL1,
                XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_CTRL1));
        dev_dbg(dev, "PCS Status Reg (%#06x) = %#06x\n", MDIO_STAT1,
                XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_STAT1));
        dev_dbg(dev, "Phy Id (PHYS ID 1 %#06x)= %#06x\n", MDIO_DEVID1,
                XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_DEVID1));
        dev_dbg(dev, "Phy Id (PHYS ID 2 %#06x)= %#06x\n", MDIO_DEVID2,
                XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_DEVID2));
        dev_dbg(dev, "Devices in Package (%#06x)= %#06x\n", MDIO_DEVS1,
                XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_DEVS1));
        dev_dbg(dev, "Devices in Package (%#06x)= %#06x\n", MDIO_DEVS2,
                XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_DEVS2));

        dev_dbg(dev, "Auto-Neg Control Reg (%#06x) = %#06x\n", MDIO_CTRL1,
                XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_CTRL1));
        dev_dbg(dev, "Auto-Neg Status Reg (%#06x) = %#06x\n", MDIO_STAT1,
                XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_STAT1));
        dev_dbg(dev, "Auto-Neg Ad Reg 1 (%#06x) = %#06x\n",
                MDIO_AN_ADVERTISE,
                XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE));
        dev_dbg(dev, "Auto-Neg Ad Reg 2 (%#06x) = %#06x\n",
                MDIO_AN_ADVERTISE + 1,
                XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE + 1));
        dev_dbg(dev, "Auto-Neg Ad Reg 3 (%#06x) = %#06x\n",
                MDIO_AN_ADVERTISE + 2,
                XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE + 2));
        dev_dbg(dev, "Auto-Neg Completion Reg (%#06x) = %#06x\n",
                MDIO_AN_COMP_STAT,
                XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_COMP_STAT));

        dev_dbg(dev, "\n*************************************************\n");
}

static int xgbe_phy_best_advertised_speed(struct xgbe_prv_data *pdata)
{
        struct ethtool_link_ksettings *lks = &pdata->phy.lks;

        if (XGBE_ADV(lks, 10000baseKR_Full))
                return SPEED_10000;
        else if (XGBE_ADV(lks, 10000baseT_Full))
                return SPEED_10000;
        else if (XGBE_ADV(lks, 2500baseX_Full))
                return SPEED_2500;
        else if (XGBE_ADV(lks, 2500baseT_Full))
                return SPEED_2500;
        else if (XGBE_ADV(lks, 1000baseKX_Full))
                return SPEED_1000;
        else if (XGBE_ADV(lks, 1000baseT_Full))
                return SPEED_1000;
        else if (XGBE_ADV(lks, 100baseT_Full))
                return SPEED_100;
        else if (XGBE_ADV(lks, 10baseT_Full))
                return SPEED_10;

        return SPEED_UNKNOWN;
}

static void xgbe_phy_exit(struct xgbe_prv_data *pdata)
{
        pdata->phy_if.phy_impl.exit(pdata);
}

static int xgbe_phy_init(struct xgbe_prv_data *pdata)
{
        struct ethtool_link_ksettings *lks = &pdata->phy.lks;
        int ret;

        mutex_init(&pdata->an_mutex);
        INIT_WORK(&pdata->an_irq_work, xgbe_an_irq_work);
        INIT_WORK(&pdata->an_work, xgbe_an_state_machine);
        pdata->mdio_mmd = MDIO_MMD_PCS;

        /* Check for FEC support */
        pdata->fec_ability = XMDIO_READ(pdata, MDIO_MMD_PMAPMD,
                                        MDIO_PMA_10GBR_FECABLE);
        pdata->fec_ability &= (MDIO_PMA_10GBR_FECABLE_ABLE |
                               MDIO_PMA_10GBR_FECABLE_ERRABLE);

        /* Setup the phy (including supported features) */
        ret = pdata->phy_if.phy_impl.init(pdata);
        if (ret)
                return ret;

        /* Copy supported link modes to advertising link modes */
        XGBE_LM_COPY(lks, advertising, lks, supported);

        pdata->phy.address = 0;

        if (XGBE_ADV(lks, Autoneg)) {
                pdata->phy.autoneg = AUTONEG_ENABLE;
                pdata->phy.speed = SPEED_UNKNOWN;
                pdata->phy.duplex = DUPLEX_UNKNOWN;
        } else {
                pdata->phy.autoneg = AUTONEG_DISABLE;
                pdata->phy.speed = xgbe_phy_best_advertised_speed(pdata);
                pdata->phy.duplex = DUPLEX_FULL;
        }

        pdata->phy_link = 0;
        pdata->phy.link = 0;

        pdata->phy.pause_autoneg = pdata->pause_autoneg;
        pdata->phy.tx_pause = pdata->tx_pause;
        pdata->phy.rx_pause = pdata->rx_pause;

        /* Fix up Flow Control advertising */
        XGBE_CLR_ADV(lks, Pause);
        XGBE_CLR_ADV(lks, Asym_Pause);

        if (pdata->rx_pause) {
                XGBE_SET_ADV(lks, Pause);
                XGBE_SET_ADV(lks, Asym_Pause);
        }

        if (pdata->tx_pause) {
                /* Equivalent to XOR of Asym_Pause */
                if (XGBE_ADV(lks, Asym_Pause))
                        XGBE_CLR_ADV(lks, Asym_Pause);
                else
                        XGBE_SET_ADV(lks, Asym_Pause);
        }

        if (netif_msg_drv(pdata))
                xgbe_dump_phy_registers(pdata);

        return 0;
}

void xgbe_init_function_ptrs_phy(struct xgbe_phy_if *phy_if)
{
        phy_if->phy_init        = xgbe_phy_init;
        phy_if->phy_exit        = xgbe_phy_exit;

        phy_if->phy_reset       = xgbe_phy_reset;
        phy_if->phy_start       = xgbe_phy_start;
        phy_if->phy_stop        = xgbe_phy_stop;

        phy_if->phy_status      = xgbe_phy_status;
        phy_if->phy_config_aneg = xgbe_phy_config_aneg;

        phy_if->phy_valid_speed = xgbe_phy_valid_speed;

        phy_if->an_isr          = xgbe_an_combined_isr;

        phy_if->module_info     = xgbe_phy_module_info;
        phy_if->module_eeprom   = xgbe_phy_module_eeprom;
}
Linux
