1// SPDX-License-Identifier: GPL-2.0+
 2/*
 3 * Driver for AMD am79c PHYs
 4 *
 5 * Author: Heiko Schocher <hs@denx.de>
 6 *
 7 * Copyright (c) 2011 DENX Software Engineering GmbH
 8 */
 9#include <linux/kernel.h>
10#include <linux/errno.h>
11#include <linux/init.h>
12#include <linux/module.h>
13#include <linux/mii.h>
14#include <linux/phy.h>
15
16#define PHY_ID_AM79C874		0x0022561b
17
18#define MII_AM79C_IR		17	/* Interrupt Status/Control Register */
19#define MII_AM79C_IR_EN_LINK	0x0400	/* IR enable Linkstate */
20#define MII_AM79C_IR_EN_ANEG	0x0100	/* IR enable Aneg Complete */
21#define MII_AM79C_IR_IMASK_INIT	(MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG)
22
23MODULE_DESCRIPTION("AMD PHY driver");
24MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
25MODULE_LICENSE("GPL");
26
27static int am79c_ack_interrupt(struct phy_device *phydev)
28{
29	int err;
30
31	err = phy_read(phydev, MII_BMSR);
32	if (err < 0)
33		return err;
34
35	err = phy_read(phydev, MII_AM79C_IR);
36	if (err < 0)
37		return err;
38
39	return 0;
40}
41
42static int am79c_config_init(struct phy_device *phydev)
43{
44	return 0;
45}
46
47static int am79c_config_intr(struct phy_device *phydev)
48{
49	int err;
50
51	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
52		err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT);
53	else
54		err = phy_write(phydev, MII_AM79C_IR, 0);
55
56	return err;
57}
58
59static struct phy_driver am79c_driver[] = { {
60	.phy_id		= PHY_ID_AM79C874,
61	.name		= "AM79C874",
62	.phy_id_mask	= 0xfffffff0,
63	/* PHY_BASIC_FEATURES */
64	.config_init	= am79c_config_init,
65	.ack_interrupt	= am79c_ack_interrupt,
66	.config_intr	= am79c_config_intr,
67} };
68
69module_phy_driver(am79c_driver);
70
71static struct mdio_device_id __maybe_unused amd_tbl[] = {
72	{ PHY_ID_AM79C874, 0xfffffff0 },
73	{ }
74};
75
76MODULE_DEVICE_TABLE(mdio, amd_tbl);