// SPDX-License-Identifier: GPL-2.0+
/*
 * drivers/net/phy/ste10Xp.c
 *
 * Driver for STMicroelectronics STe10Xp PHYs
 *
 * Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
 *
 * Copyright (c) 2008 STMicroelectronics Limited
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/phy.h>

#define MII_XCIIS       0x11    /* Configuration Info IRQ & Status Reg */
#define MII_XIE         0x12    /* Interrupt Enable Register */
#define MII_XIE_DEFAULT_MASK 0x0070 /* ANE complete, Remote Fault, Link Down */

#define STE101P_PHY_ID          0x00061c50
#define STE100P_PHY_ID          0x1c040011

static int ste10Xp_config_init(struct phy_device *phydev)
{
        int value, err;

        /* Software Reset PHY */
        value = phy_read(phydev, MII_BMCR);
        if (value < 0)
                return value;

        value |= BMCR_RESET;
        err = phy_write(phydev, MII_BMCR, value);
        if (err < 0)
                return err;

        do {
                value = phy_read(phydev, MII_BMCR);
        } while (value & BMCR_RESET);

        return 0;
}

static int ste10Xp_ack_interrupt(struct phy_device *phydev)
{
        int err = phy_read(phydev, MII_XCIIS);

        if (err < 0)
                return err;

        return 0;
}

static int ste10Xp_config_intr(struct phy_device *phydev)
{
        int err;

        if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
                /* clear any pending interrupts */
                err = ste10Xp_ack_interrupt(phydev);
                if (err)
                        return err;

                /* Enable all STe101P interrupts (PR12) */
                err = phy_write(phydev, MII_XIE, MII_XIE_DEFAULT_MASK);
        } else {
                err = phy_write(phydev, MII_XIE, 0);
                if (err)
                        return err;

                err = ste10Xp_ack_interrupt(phydev);
        }

        return err;
}

static irqreturn_t ste10Xp_handle_interrupt(struct phy_device *phydev)
{
        int irq_status;

        irq_status = phy_read(phydev, MII_XCIIS);
        if (irq_status < 0) {
                phy_error(phydev);
                return IRQ_NONE;
        }

        if (!(irq_status & MII_XIE_DEFAULT_MASK))
                return IRQ_NONE;

        phy_trigger_machine(phydev);

        return IRQ_HANDLED;
}

static struct phy_driver ste10xp_pdriver[] = {
{
        .phy_id = STE101P_PHY_ID,
        .phy_id_mask = 0xfffffff0,
        .name = "STe101p",
        /* PHY_BASIC_FEATURES */
        .config_init = ste10Xp_config_init,
        .config_intr = ste10Xp_config_intr,
        .handle_interrupt = ste10Xp_handle_interrupt,
        .suspend = genphy_suspend,
        .resume = genphy_resume,
}, {
        .phy_id = STE100P_PHY_ID,
        .phy_id_mask = 0xffffffff,
        .name = "STe100p",
        /* PHY_BASIC_FEATURES */
        .config_init = ste10Xp_config_init,
        .config_intr = ste10Xp_config_intr,
        .handle_interrupt = ste10Xp_handle_interrupt,
        .suspend = genphy_suspend,
        .resume = genphy_resume,
} };

module_phy_driver(ste10xp_pdriver);

static const struct mdio_device_id __maybe_unused ste10Xp_tbl[] = {
        { STE101P_PHY_ID, 0xfffffff0 },
        { STE100P_PHY_ID, 0xffffffff },
        { }
};

MODULE_DEVICE_TABLE(mdio, ste10Xp_tbl);

MODULE_DESCRIPTION("STMicroelectronics STe10Xp PHY driver");
MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
MODULE_LICENSE("GPL");