// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2011 - 2012 Cavium, Inc.
 */

#include <linux/module.h>
#include <linux/phy.h>
#include <linux/of.h>

#define PHY_ID_BCM8706  0x0143bdc1
#define PHY_ID_BCM8727  0x0143bff0

#define BCM87XX_PMD_RX_SIGNAL_DETECT    0x000a
#define BCM87XX_10GBASER_PCS_STATUS     0x0020
#define BCM87XX_XGXS_LANE_STATUS        0x0018

#define BCM87XX_LASI_CONTROL            0x9002
#define BCM87XX_LASI_STATUS             0x9005

#if IS_ENABLED(CONFIG_OF_MDIO)
/* Set and/or override some configuration registers based on the
 * broadcom,c45-reg-init property stored in the of_node for the phydev.
 *
 * broadcom,c45-reg-init = <devid reg mask value>,...;
 *
 * There may be one or more sets of <devid reg mask value>:
 *
 * devid: which sub-device to use.
 * reg: the register.
 * mask: if non-zero, ANDed with existing register value.
 * value: ORed with the masked value and written to the regiser.
 *
 */
static int bcm87xx_of_reg_init(struct phy_device *phydev)
{
        const __be32 *paddr;
        const __be32 *paddr_end;
        int len, ret;

        if (!phydev->mdio.dev.of_node)
                return 0;

        paddr = of_get_property(phydev->mdio.dev.of_node,
                                "broadcom,c45-reg-init", &len);
        if (!paddr)
                return 0;

        paddr_end = paddr + (len /= sizeof(*paddr));

        ret = 0;

        while (paddr + 3 < paddr_end) {
                u16 devid       = be32_to_cpup(paddr++);
                u16 reg         = be32_to_cpup(paddr++);
                u16 mask        = be32_to_cpup(paddr++);
                u16 val_bits    = be32_to_cpup(paddr++);
                int val = 0;

                if (mask) {
                        val = phy_read_mmd(phydev, devid, reg);
                        if (val < 0) {
                                ret = val;
                                goto err;
                        }
                        val &= mask;
                }
                val |= val_bits;

                ret = phy_write_mmd(phydev, devid, reg, val);
                if (ret < 0)
                        goto err;
        }
err:
        return ret;
}
#else
static int bcm87xx_of_reg_init(struct phy_device *phydev)
{
        return 0;
}
#endif /* CONFIG_OF_MDIO */

static int bcm87xx_get_features(struct phy_device *phydev)
{
        linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseR_FEC_BIT,
                         phydev->supported);
        return 0;
}

static int bcm87xx_config_init(struct phy_device *phydev)
{
        return bcm87xx_of_reg_init(phydev);
}

static int bcm87xx_config_aneg(struct phy_device *phydev)
{
        return -EINVAL;
}

static int bcm87xx_read_status(struct phy_device *phydev)
{
        int rx_signal_detect;
        int pcs_status;
        int xgxs_lane_status;

        rx_signal_detect = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
                                        BCM87XX_PMD_RX_SIGNAL_DETECT);
        if (rx_signal_detect < 0)
                return rx_signal_detect;

        if ((rx_signal_detect & 1) == 0)
                goto no_link;

        pcs_status = phy_read_mmd(phydev, MDIO_MMD_PCS,
                                  BCM87XX_10GBASER_PCS_STATUS);
        if (pcs_status < 0)
                return pcs_status;

        if ((pcs_status & 1) == 0)
                goto no_link;

        xgxs_lane_status = phy_read_mmd(phydev, MDIO_MMD_PHYXS,
                                        BCM87XX_XGXS_LANE_STATUS);
        if (xgxs_lane_status < 0)
                return xgxs_lane_status;

        if ((xgxs_lane_status & 0x1000) == 0)
                goto no_link;

        phydev->speed = 10000;
        phydev->link = 1;
        phydev->duplex = 1;
        return 0;

no_link:
        phydev->link = 0;
        return 0;
}

static int bcm87xx_config_intr(struct phy_device *phydev)
{
        int reg, err;

        reg = phy_read_mmd(phydev, MDIO_MMD_PCS, BCM87XX_LASI_CONTROL);

        if (reg < 0)
                return reg;

        if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
                err = phy_read_mmd(phydev, MDIO_MMD_PCS, BCM87XX_LASI_STATUS);
                if (err)
                        return err;

                reg |= 1;
                err = phy_write_mmd(phydev, MDIO_MMD_PCS,
                                    BCM87XX_LASI_CONTROL, reg);
        } else {
                reg &= ~1;
                err = phy_write_mmd(phydev, MDIO_MMD_PCS,
                                    BCM87XX_LASI_CONTROL, reg);
                if (err)
                        return err;

                err = phy_read_mmd(phydev, MDIO_MMD_PCS, BCM87XX_LASI_STATUS);
        }

        return err;
}

static irqreturn_t bcm87xx_handle_interrupt(struct phy_device *phydev)
{
        int irq_status;

        irq_status = phy_read(phydev, BCM87XX_LASI_STATUS);
        if (irq_status < 0) {
                phy_error(phydev);
                return IRQ_NONE;
        }

        if (irq_status == 0)
                return IRQ_NONE;

        phy_trigger_machine(phydev);

        return IRQ_HANDLED;
}

static int bcm87xx_match_phy_device(struct phy_device *phydev,
                                    const struct phy_driver *phydrv)
{
        return phydev->c45_ids.device_ids[4] == phydrv->phy_id;
}

static struct phy_driver bcm87xx_driver[] = {
{
        .phy_id         = PHY_ID_BCM8706,
        .phy_id_mask    = 0xffffffff,
        .name           = "Broadcom BCM8706",
        .get_features   = bcm87xx_get_features,
        .config_init    = bcm87xx_config_init,
        .config_aneg    = bcm87xx_config_aneg,
        .read_status    = bcm87xx_read_status,
        .config_intr    = bcm87xx_config_intr,
        .handle_interrupt = bcm87xx_handle_interrupt,
        .match_phy_device = bcm87xx_match_phy_device,
}, {
        .phy_id         = PHY_ID_BCM8727,
        .phy_id_mask    = 0xffffffff,
        .name           = "Broadcom BCM8727",
        .get_features   = bcm87xx_get_features,
        .config_init    = bcm87xx_config_init,
        .config_aneg    = bcm87xx_config_aneg,
        .read_status    = bcm87xx_read_status,
        .config_intr    = bcm87xx_config_intr,
        .handle_interrupt = bcm87xx_handle_interrupt,
        .match_phy_device = bcm87xx_match_phy_device,
} };

module_phy_driver(bcm87xx_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Broadcom BCM87xx PHY driver");