// SPDX-License-Identifier: GPL-2.0+
/*
 * drivers/net/phy/et1011c.c
 *
 * Driver for LSI ET1011C PHYs
 *
 * Author: Chaithrika U S
 *
 * Copyright (c) 2008 Texas Instruments
 */
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/phy.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <asm/irq.h>

#define ET1011C_STATUS_REG      (0x1A)
#define ET1011C_CONFIG_REG      (0x16)
#define ET1011C_SPEED_MASK              (0x0300)
#define ET1011C_GIGABIT_SPEED           (0x0200)
#define ET1011C_TX_FIFO_MASK            (0x3000)
#define ET1011C_TX_FIFO_DEPTH_8         (0x0000)
#define ET1011C_TX_FIFO_DEPTH_16        (0x1000)
#define ET1011C_INTERFACE_MASK          (0x0007)
#define ET1011C_GMII_INTERFACE          (0x0002)
#define ET1011C_SYS_CLK_EN              (0x01 << 4)


MODULE_DESCRIPTION("LSI ET1011C PHY driver");
MODULE_AUTHOR("Chaithrika U S");
MODULE_LICENSE("GPL");

static int et1011c_config_aneg(struct phy_device *phydev)
{
        int ctl = phy_read(phydev, MII_BMCR);

        if (ctl < 0)
                return ctl;
        ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_SPEED1000 |
                 BMCR_ANENABLE);
        /* First clear the PHY */
        phy_write(phydev, MII_BMCR, ctl | BMCR_RESET);

        return genphy_config_aneg(phydev);
}

static int et1011c_read_status(struct phy_device *phydev)
{
        static int speed;
        int ret;
        u32 val;

        ret = genphy_read_status(phydev);

        if (speed != phydev->speed) {
                speed = phydev->speed;
                val = phy_read(phydev, ET1011C_STATUS_REG);
                if ((val & ET1011C_SPEED_MASK) ==
                                        ET1011C_GIGABIT_SPEED) {
                        val = phy_read(phydev, ET1011C_CONFIG_REG);
                        val &= ~ET1011C_TX_FIFO_MASK;
                        phy_write(phydev, ET1011C_CONFIG_REG, val |
                                          ET1011C_GMII_INTERFACE |
                                          ET1011C_SYS_CLK_EN |
                                          ET1011C_TX_FIFO_DEPTH_16);

                }
        }
        return ret;
}

static struct phy_driver et1011c_driver[] = { {
        .phy_id         = 0x0282f014,
        .name           = "ET1011C",
        .phy_id_mask    = 0xfffffff0,
        /* PHY_GBIT_FEATURES */
        .config_aneg    = et1011c_config_aneg,
        .read_status    = et1011c_read_status,
} };

module_phy_driver(et1011c_driver);

static const struct mdio_device_id __maybe_unused et1011c_tbl[] = {
        { 0x0282f014, 0xfffffff0 },
        { }
};

MODULE_DEVICE_TABLE(mdio, et1011c_tbl);