// SPDX-License-Identifier: GPL-2.0+
#include <linux/bitfield.h>
#include <linux/module.h>
#include <linux/phy.h>

#define MTK_EXT_PAGE_ACCESS		0x1f
#define MTK_PHY_PAGE_STANDARD		0x0000
#define MTK_PHY_PAGE_EXTENDED		0x0001
#define MTK_PHY_PAGE_EXTENDED_2		0x0002
#define MTK_PHY_PAGE_EXTENDED_3		0x0003
#define MTK_PHY_PAGE_EXTENDED_2A30	0x2a30
#define MTK_PHY_PAGE_EXTENDED_52B5	0x52b5

static int mtk_gephy_read_page(struct phy_device *phydev)
{
	return __phy_read(phydev, MTK_EXT_PAGE_ACCESS);
}

static int mtk_gephy_write_page(struct phy_device *phydev, int page)
{
	return __phy_write(phydev, MTK_EXT_PAGE_ACCESS, page);
}

static void mtk_gephy_config_init(struct phy_device *phydev)
{
	/* Disable EEE */
	phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, 0);

	/* Enable HW auto downshift */
	phy_modify_paged(phydev, MTK_PHY_PAGE_EXTENDED, 0x14, 0, BIT(4));

	/* Increase SlvDPSready time */
	phy_select_page(phydev, MTK_PHY_PAGE_EXTENDED_52B5);
	__phy_write(phydev, 0x10, 0xafae);
	__phy_write(phydev, 0x12, 0x2f);
	__phy_write(phydev, 0x10, 0x8fae);
	phy_restore_page(phydev, MTK_PHY_PAGE_STANDARD, 0);

	/* Adjust 100_mse_threshold */
	phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x123, 0xffff);

	/* Disable mcc */
	phy_write_mmd(phydev, MDIO_MMD_VEND1, 0xa6, 0x300);
}

static int mt7530_phy_config_init(struct phy_device *phydev)
{
	mtk_gephy_config_init(phydev);

	/* Increase post_update_timer */
	phy_write_paged(phydev, MTK_PHY_PAGE_EXTENDED_3, 0x11, 0x4b);

	return 0;
}

static int mt7531_phy_config_init(struct phy_device *phydev)
{
	mtk_gephy_config_init(phydev);

	/* PHY link down power saving enable */
	phy_set_bits(phydev, 0x17, BIT(4));
	phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1, 0xc6, 0x300);

	/* Set TX Pair delay selection */
	phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x13, 0x404);
	phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x14, 0x404);

	return 0;
}

static struct phy_driver mtk_gephy_driver[] = {
	{
		PHY_ID_MATCH_EXACT(0x03a29412),
		.name		= "MediaTek MT7530 PHY",
		.config_init	= mt7530_phy_config_init,
		/* Interrupts are handled by the switch, not the PHY
		 * itself.
		 */
		.config_intr	= genphy_no_config_intr,
		.handle_interrupt = genphy_handle_interrupt_no_ack,
		.suspend	= genphy_suspend,
		.resume		= genphy_resume,
		.read_page	= mtk_gephy_read_page,
		.write_page	= mtk_gephy_write_page,
	},
	{
		PHY_ID_MATCH_EXACT(0x03a29441),
		.name		= "MediaTek MT7531 PHY",
		.config_init	= mt7531_phy_config_init,
		/* Interrupts are handled by the switch, not the PHY
		 * itself.
		 */
		.config_intr	= genphy_no_config_intr,
		.handle_interrupt = genphy_handle_interrupt_no_ack,
		.suspend	= genphy_suspend,
		.resume		= genphy_resume,
		.read_page	= mtk_gephy_read_page,
		.write_page	= mtk_gephy_write_page,
	},
};

module_phy_driver(mtk_gephy_driver);

static struct mdio_device_id __maybe_unused mtk_gephy_tbl[] = {
	{ PHY_ID_MATCH_VENDOR(0x03a29400) },
	{ }
};

MODULE_DESCRIPTION("MediaTek Gigabit Ethernet PHY driver");
MODULE_AUTHOR("DENG, Qingfang <dqfext@gmail.com>");
MODULE_LICENSE("GPL");

MODULE_DEVICE_TABLE(mdio, mtk_gephy_tbl);