/*
 * Copyright (c) 2016~2017 Hisilicon Limited.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/etherdevice.h>
#include <linux/kernel.h>

#include "hclge_cmd.h"
#include "hclge_main.h"
#include "hclge_mdio.h"

enum hclge_mdio_c22_op_seq {
	HCLGE_MDIO_C22_WRITE = 1,
	HCLGE_MDIO_C22_READ = 2
};

#define HCLGE_MDIO_CTRL_START_B		0
#define HCLGE_MDIO_CTRL_ST_S		1
#define HCLGE_MDIO_CTRL_ST_M		(0x3 << HCLGE_MDIO_CTRL_ST_S)
#define HCLGE_MDIO_CTRL_OP_S		3
#define HCLGE_MDIO_CTRL_OP_M		(0x3 << HCLGE_MDIO_CTRL_OP_S)

#define HCLGE_MDIO_PHYID_S		0
#define HCLGE_MDIO_PHYID_M		(0x1f << HCLGE_MDIO_PHYID_S)

#define HCLGE_MDIO_PHYREG_S		0
#define HCLGE_MDIO_PHYREG_M		(0x1f << HCLGE_MDIO_PHYREG_S)

#define HCLGE_MDIO_STA_B		0

struct hclge_mdio_cfg_cmd {
	u8 ctrl_bit;
	u8 phyid;
	u8 phyad;
	u8 rsvd;
	__le16 reserve;
	__le16 data_wr;
	__le16 data_rd;
	__le16 sta;
};

static int hclge_mdio_write(struct mii_bus *bus, int phyid, int regnum,
			    u16 data)
{
	struct hclge_mdio_cfg_cmd *mdio_cmd;
	struct hclge_dev *hdev = bus->priv;
	struct hclge_desc desc;
	int ret;

	hclge_cmd_setup_basic_desc(&desc, HCLGE_OPC_MDIO_CONFIG, false);

	mdio_cmd = (struct hclge_mdio_cfg_cmd *)desc.data;

	hnae_set_field(mdio_cmd->phyid, HCLGE_MDIO_PHYID_M,
		       HCLGE_MDIO_PHYID_S, phyid);
	hnae_set_field(mdio_cmd->phyad, HCLGE_MDIO_PHYREG_M,
		       HCLGE_MDIO_PHYREG_S, regnum);

	hnae_set_bit(mdio_cmd->ctrl_bit, HCLGE_MDIO_CTRL_START_B, 1);
	hnae_set_field(mdio_cmd->ctrl_bit, HCLGE_MDIO_CTRL_ST_M,
		       HCLGE_MDIO_CTRL_ST_S, 1);
	hnae_set_field(mdio_cmd->ctrl_bit, HCLGE_MDIO_CTRL_OP_M,
		       HCLGE_MDIO_CTRL_OP_S, HCLGE_MDIO_C22_WRITE);

	mdio_cmd->data_wr = cpu_to_le16(data);

	ret = hclge_cmd_send(&hdev->hw, &desc, 1);
	if (ret) {
		dev_err(&hdev->pdev->dev,
			"mdio write fail when sending cmd, status is %d.\n",
			ret);
		return ret;
	}

	return 0;
}

static int hclge_mdio_read(struct mii_bus *bus, int phyid, int regnum)
{
	struct hclge_mdio_cfg_cmd *mdio_cmd;
	struct hclge_dev *hdev = bus->priv;
	struct hclge_desc desc;
	int ret;

	hclge_cmd_setup_basic_desc(&desc, HCLGE_OPC_MDIO_CONFIG, true);

	mdio_cmd = (struct hclge_mdio_cfg_cmd *)desc.data;

	hnae_set_field(mdio_cmd->phyid, HCLGE_MDIO_PHYID_M,
		       HCLGE_MDIO_PHYID_S, phyid);
	hnae_set_field(mdio_cmd->phyad, HCLGE_MDIO_PHYREG_M,
		       HCLGE_MDIO_PHYREG_S, regnum);

	hnae_set_bit(mdio_cmd->ctrl_bit, HCLGE_MDIO_CTRL_START_B, 1);
	hnae_set_field(mdio_cmd->ctrl_bit, HCLGE_MDIO_CTRL_ST_M,
		       HCLGE_MDIO_CTRL_ST_S, 1);
	hnae_set_field(mdio_cmd->ctrl_bit, HCLGE_MDIO_CTRL_OP_M,
		       HCLGE_MDIO_CTRL_OP_S, HCLGE_MDIO_C22_READ);

	/* Read out phy data */
	ret = hclge_cmd_send(&hdev->hw, &desc, 1);
	if (ret) {
		dev_err(&hdev->pdev->dev,
			"mdio read fail when get data, status is %d.\n",
			ret);
		return ret;
	}

	if (hnae_get_bit(le16_to_cpu(mdio_cmd->sta), HCLGE_MDIO_STA_B)) {
		dev_err(&hdev->pdev->dev, "mdio read data error\n");
		return -EIO;
	}

	return le16_to_cpu(mdio_cmd->data_rd);
}

int hclge_mac_mdio_config(struct hclge_dev *hdev)
{
	struct hclge_mac *mac = &hdev->hw.mac;
	struct phy_device *phydev;
	struct mii_bus *mdio_bus;
	int ret;

	if (hdev->hw.mac.phy_addr >= PHY_MAX_ADDR)
		return 0;

	mdio_bus = devm_mdiobus_alloc(&hdev->pdev->dev);
	if (!mdio_bus)
		return -ENOMEM;

	mdio_bus->name = "hisilicon MII bus";
	mdio_bus->read = hclge_mdio_read;
	mdio_bus->write = hclge_mdio_write;
	snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s-%s", "mii",
		 dev_name(&hdev->pdev->dev));

	mdio_bus->parent = &hdev->pdev->dev;
	mdio_bus->priv = hdev;
	mdio_bus->phy_mask = ~(1 << mac->phy_addr);
	ret = mdiobus_register(mdio_bus);
	if (ret) {
		dev_err(mdio_bus->parent,
			"Failed to register MDIO bus ret = %#x\n", ret);
		return ret;
	}

	phydev = mdiobus_get_phy(mdio_bus, mac->phy_addr);
	if (!phydev) {
		dev_err(mdio_bus->parent, "Failed to get phy device\n");
		mdiobus_unregister(mdio_bus);
		return -EIO;
	}

	mac->phydev = phydev;
	mac->mdio_bus = mdio_bus;

	return 0;
}

static void hclge_mac_adjust_link(struct net_device *netdev)
{
	struct hnae3_handle *h = *((void **)netdev_priv(netdev));
	struct hclge_vport *vport = hclge_get_vport(h);
	struct hclge_dev *hdev = vport->back;
	int duplex, speed;
	int ret;

	speed = netdev->phydev->speed;
	duplex = netdev->phydev->duplex;

	ret = hclge_cfg_mac_speed_dup(hdev, speed, duplex);
	if (ret)
		netdev_err(netdev, "failed to adjust link.\n");
}

int hclge_mac_start_phy(struct hclge_dev *hdev)
{
	struct net_device *netdev = hdev->vport[0].nic.netdev;
	struct phy_device *phydev = hdev->hw.mac.phydev;
	int ret;

	if (!phydev)
		return 0;

	ret = phy_connect_direct(netdev, phydev,
				 hclge_mac_adjust_link,
				 PHY_INTERFACE_MODE_SGMII);
	if (ret) {
		netdev_err(netdev, "phy_connect_direct err.\n");
		return ret;
	}

	phy_start(phydev);

	return 0;
}

void hclge_mac_stop_phy(struct hclge_dev *hdev)
{
	struct net_device *netdev = hdev->vport[0].nic.netdev;
	struct phy_device *phydev = netdev->phydev;

	if (!phydev)
		return;

	phy_stop(phydev);
	phy_disconnect(phydev);
}