/*
 * This file is based on code from OCTEON SDK by Cavium Networks.
 *
 * Copyright (c) 2003-2007 Cavium Networks
 *
 * This file is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, Version 2, as
 * published by the Free Software Foundation.
 */

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

#include <asm/octeon/octeon.h>

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

#include <asm/octeon/cvmx-gmxx-defs.h>
#include <asm/octeon/cvmx-smix-defs.h>

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

static int cvm_oct_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
        struct octeon_ethernet *priv = netdev_priv(dev);

        if (priv->phydev)
                return phy_ethtool_gset(priv->phydev, cmd);

        return -EINVAL;
}

static int cvm_oct_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
        struct octeon_ethernet *priv = netdev_priv(dev);

        if (!capable(CAP_NET_ADMIN))
                return -EPERM;

        if (priv->phydev)
                return phy_ethtool_sset(priv->phydev, cmd);

        return -EINVAL;
}

static int cvm_oct_nway_reset(struct net_device *dev)
{
        struct octeon_ethernet *priv = netdev_priv(dev);

        if (!capable(CAP_NET_ADMIN))
                return -EPERM;

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

        return -EINVAL;
}

const struct ethtool_ops cvm_oct_ethtool_ops = {
        .get_drvinfo = cvm_oct_get_drvinfo,
        .get_settings = cvm_oct_get_settings,
        .set_settings = cvm_oct_set_settings,
        .nway_reset = cvm_oct_nway_reset,
        .get_link = ethtool_op_get_link,
};

/**
 * 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)
{
        struct octeon_ethernet *priv = netdev_priv(dev);

        if (!netif_running(dev))
                return -EINVAL;

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

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

void cvm_oct_note_carrier(struct octeon_ethernet *priv,
                          cvmx_helper_link_info_t 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);
        cvmx_helper_link_info_t link_info;

        if (priv->last_link != priv->phydev->link) {
                priv->last_link = priv->phydev->link;
                link_info.u64 = 0;
                link_info.s.link_up = priv->last_link ? 1 : 0;
                link_info.s.full_duplex = priv->phydev->duplex ? 1 : 0;
                link_info.s.speed = priv->phydev->speed;

                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);
        cvmx_helper_link_info_t 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 (priv->phydev)
                phy_disconnect(priv->phydev);
        priv->phydev = NULL;

        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;

        if (!priv->of_node)
                goto no_phy;

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

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

        if (priv->phydev == NULL)
                return -ENODEV;

        priv->last_link = 0;
        phy_start_aneg(priv->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;
}