// SPDX-License-Identifier: GPL-2.0
/*
 * This file is based on code from OCTEON SDK by Cavium Networks.
 *
 * Copyright (c) 2003-2007 Cavium Networks
 */

#include <linux/kernel.h>
#include <linux/ethtool.h>
#include <linux/phy.h>
#include <linux/ratelimit.h>
#include <linux/of_mdio.h>
#include <net/dst.h>

#include "octeon-ethernet.h"
#include "ethernet-defines.h"
#include "ethernet-mdio.h"
#include "ethernet-util.h"

static void cvm_oct_get_drvinfo(struct net_device *dev,
                                struct ethtool_drvinfo *info)
{
        strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
        strscpy(info->bus_info, "Builtin", sizeof(info->bus_info));
}

static int cvm_oct_nway_reset(struct net_device *dev)
{
        if (!capable(CAP_NET_ADMIN))
                return -EPERM;

        if (dev->phydev)
                return phy_start_aneg(dev->phydev);

        return -EINVAL;
}

const struct ethtool_ops cvm_oct_ethtool_ops = {
        .get_drvinfo = cvm_oct_get_drvinfo,
        .nway_reset = cvm_oct_nway_reset,
        .get_link = ethtool_op_get_link,
        .get_link_ksettings = phy_ethtool_get_link_ksettings,
        .set_link_ksettings = phy_ethtool_set_link_ksettings,
};

/**
 * cvm_oct_ioctl - IOCTL support for PHY control
 * @dev:    Device to change
 * @rq:     the request
 * @cmd:    the command
 *
 * Returns Zero on success
 */
int cvm_oct_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
        if (!netif_running(dev))
                return -EINVAL;

        if (!dev->phydev)
                return -EINVAL;

        return phy_mii_ioctl(dev->phydev, rq, cmd);
}

void cvm_oct_note_carrier(struct octeon_ethernet *priv,
                          union cvmx_helper_link_info li)
{
        if (li.s.link_up) {
                pr_notice_ratelimited("%s: %u Mbps %s duplex, port %d, queue %d\n",
                                      netdev_name(priv->netdev), li.s.speed,
                                      (li.s.full_duplex) ? "Full" : "Half",
                                      priv->port, priv->queue);
        } else {
                pr_notice_ratelimited("%s: Link down\n",
                                      netdev_name(priv->netdev));
        }
}

void cvm_oct_adjust_link(struct net_device *dev)
{
        struct octeon_ethernet *priv = netdev_priv(dev);
        union cvmx_helper_link_info link_info;

        link_info.u64           = 0;
        link_info.s.link_up     = dev->phydev->link ? 1 : 0;
        link_info.s.full_duplex = dev->phydev->duplex ? 1 : 0;
        link_info.s.speed       = dev->phydev->speed;
        priv->link_info         = link_info.u64;

        /*
         * The polling task need to know about link status changes.
         */
        if (priv->poll)
                priv->poll(dev);

        if (priv->last_link != dev->phydev->link) {
                priv->last_link = dev->phydev->link;
                cvmx_helper_link_set(priv->port, link_info);
                cvm_oct_note_carrier(priv, link_info);
        }
}

int cvm_oct_common_stop(struct net_device *dev)
{
        struct octeon_ethernet *priv = netdev_priv(dev);
        int interface = INTERFACE(priv->port);
        union cvmx_helper_link_info link_info;
        union cvmx_gmxx_prtx_cfg gmx_cfg;
        int index = INDEX(priv->port);

        gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
        gmx_cfg.s.en = 0;
        cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);

        priv->poll = NULL;

        if (dev->phydev)
                phy_disconnect(dev->phydev);

        if (priv->last_link) {
                link_info.u64 = 0;
                priv->last_link = 0;

                cvmx_helper_link_set(priv->port, link_info);
                cvm_oct_note_carrier(priv, link_info);
        }
        return 0;
}

/**
 * cvm_oct_phy_setup_device - setup the PHY
 *
 * @dev:    Device to setup
 *
 * Returns Zero on success, negative on failure
 */
int cvm_oct_phy_setup_device(struct net_device *dev)
{
        struct octeon_ethernet *priv = netdev_priv(dev);
        struct device_node *phy_node;
        struct phy_device *phydev = NULL;

        if (!priv->of_node)
                goto no_phy;

        phy_node = of_parse_phandle(priv->of_node, "phy-handle", 0);
        if (!phy_node && of_phy_is_fixed_link(priv->of_node))
                phy_node = of_node_get(priv->of_node);
        if (!phy_node)
                goto no_phy;

        phydev = of_phy_connect(dev, phy_node, cvm_oct_adjust_link, 0,
                                priv->phy_mode);
        of_node_put(phy_node);

        if (!phydev)
                return -EPROBE_DEFER;

        priv->last_link = 0;
        phy_start(phydev);

        return 0;
no_phy:
        /* If there is no phy, assume a direct MAC connection and that
         * the link is up.
         */
        netif_carrier_on(dev);
        return 0;
}