// SPDX-License-Identifier: GPL-2.0+
/*
 *      Driver for Broadcom 63xx SOCs integrated PHYs
 */
#include "bcm-phy-lib.h"
#include <linux/module.h>
#include <linux/phy.h>

#define MII_BCM63XX_IR          0x1a    /* interrupt register */
#define MII_BCM63XX_IR_EN       0x4000  /* global interrupt enable */
#define MII_BCM63XX_IR_DUPLEX   0x0800  /* duplex changed */
#define MII_BCM63XX_IR_SPEED    0x0400  /* speed changed */
#define MII_BCM63XX_IR_LINK     0x0200  /* link changed */
#define MII_BCM63XX_IR_GMASK    0x0100  /* global interrupt mask */

MODULE_DESCRIPTION("Broadcom 63xx internal PHY driver");
MODULE_AUTHOR("Maxime Bizon <mbizon@freebox.fr>");
MODULE_LICENSE("GPL");

static int bcm63xx_config_intr(struct phy_device *phydev)
{
        int reg, err;

        reg = phy_read(phydev, MII_BCM63XX_IR);
        if (reg < 0)
                return reg;

        if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
                err = bcm_phy_ack_intr(phydev);
                if (err)
                        return err;

                reg &= ~MII_BCM63XX_IR_GMASK;
                err = phy_write(phydev, MII_BCM63XX_IR, reg);
        } else {
                reg |= MII_BCM63XX_IR_GMASK;
                err = phy_write(phydev, MII_BCM63XX_IR, reg);
                if (err)
                        return err;

                err = bcm_phy_ack_intr(phydev);
        }

        return err;
}

static int bcm63xx_config_init(struct phy_device *phydev)
{
        int reg, err;

        /* ASYM_PAUSE bit is marked RO in datasheet, so don't cheat */
        linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported);

        reg = phy_read(phydev, MII_BCM63XX_IR);
        if (reg < 0)
                return reg;

        /* Mask interrupts globally.  */
        reg |= MII_BCM63XX_IR_GMASK;
        err = phy_write(phydev, MII_BCM63XX_IR, reg);
        if (err < 0)
                return err;

        /* Unmask events we are interested in  */
        reg = ~(MII_BCM63XX_IR_DUPLEX |
                MII_BCM63XX_IR_SPEED |
                MII_BCM63XX_IR_LINK) |
                MII_BCM63XX_IR_EN;
        return phy_write(phydev, MII_BCM63XX_IR, reg);
}

static struct phy_driver bcm63xx_driver[] = {
{
        .phy_id         = 0x00406000,
        .phy_id_mask    = 0xfffffc00,
        .name           = "Broadcom BCM63XX (1)",
        /* PHY_BASIC_FEATURES */
        .flags          = PHY_IS_INTERNAL,
        .config_init    = bcm63xx_config_init,
        .config_intr    = bcm63xx_config_intr,
        .handle_interrupt = bcm_phy_handle_interrupt,
}, {
        /* same phy as above, with just a different OUI */
        .phy_id         = 0x002bdc00,
        .phy_id_mask    = 0xfffffc00,
        .name           = "Broadcom BCM63XX (2)",
        /* PHY_BASIC_FEATURES */
        .flags          = PHY_IS_INTERNAL,
        .config_init    = bcm63xx_config_init,
        .config_intr    = bcm63xx_config_intr,
        .handle_interrupt = bcm_phy_handle_interrupt,
} };

module_phy_driver(bcm63xx_driver);

static const struct mdio_device_id __maybe_unused bcm63xx_tbl[] = {
        { 0x00406000, 0xfffffc00 },
        { 0x002bdc00, 0xfffffc00 },
        { }
};

MODULE_DEVICE_TABLE(mdio, bcm63xx_tbl);