// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2016 Broadcom

#include <linux/device.h>
#include <linux/module.h>
#include <linux/of_mdio.h>
#include <linux/mdio.h>
#include <linux/phy.h>
#include <linux/phy/phy.h>

#define BLK_ADDR_REG_OFFSET     0x1f
#define PLL_AFE1_100MHZ_BLK     0x2100
#define PLL_CLK_AMP_OFFSET      0x03
#define PLL_CLK_AMP_2P05V       0x2b18

static int ns2_pci_phy_init(struct phy *p)
{
        struct mdio_device *mdiodev = phy_get_drvdata(p);
        int rc;

        /* select the AFE 100MHz block page */
        rc = mdiodev_write(mdiodev, BLK_ADDR_REG_OFFSET, PLL_AFE1_100MHZ_BLK);
        if (rc)
                goto err;

        /* set the 100 MHz reference clock amplitude to 2.05 v */
        rc = mdiodev_write(mdiodev, PLL_CLK_AMP_OFFSET, PLL_CLK_AMP_2P05V);
        if (rc)
                goto err;

        return 0;

err:
        dev_err(&mdiodev->dev, "Error %d writing to phy\n", rc);
        return rc;
}

static const struct phy_ops ns2_pci_phy_ops = {
        .init = ns2_pci_phy_init,
        .owner = THIS_MODULE,
};

static int ns2_pci_phy_probe(struct mdio_device *mdiodev)
{
        struct device *dev = &mdiodev->dev;
        struct phy_provider *provider;
        struct phy *phy;

        phy = devm_phy_create(dev, dev->of_node, &ns2_pci_phy_ops);
        if (IS_ERR(phy)) {
                dev_err(dev, "failed to create Phy\n");
                return PTR_ERR(phy);
        }

        phy_set_drvdata(phy, mdiodev);

        provider = devm_of_phy_provider_register(&phy->dev,
                                                 of_phy_simple_xlate);
        if (IS_ERR(provider)) {
                dev_err(dev, "failed to register Phy provider\n");
                return PTR_ERR(provider);
        }

        return 0;
}

static const struct of_device_id ns2_pci_phy_of_match[] = {
        { .compatible = "brcm,ns2-pcie-phy", },
        { /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ns2_pci_phy_of_match);

static struct mdio_driver ns2_pci_phy_driver = {
        .mdiodrv = {
                .driver = {
                        .name = "phy-bcm-ns2-pci",
                        .of_match_table = ns2_pci_phy_of_match,
                },
        },
        .probe = ns2_pci_phy_probe,
};
mdio_module_driver(ns2_pci_phy_driver);

MODULE_AUTHOR("Broadcom");
MODULE_DESCRIPTION("Broadcom Northstar2 PCI Phy driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:phy-bcm-ns2-pci");