1/*
 2 * Driver for AMD am79c PHYs
 3 *
 4 * Author: Heiko Schocher <hs@denx.de>
 5 *
 6 * Copyright (c) 2011 DENX Software Engineering GmbH
 7 *
 8 * This program is free software; you can redistribute  it and/or modify it
 9 * under  the terms of  the GNU General  Public License as published by the
10 * Free Software Foundation;  either version 2 of the  License, or (at your
11 * option) any later version.
12 *
13 */
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/mii.h>
19#include <linux/phy.h>
20
21#define PHY_ID_AM79C874		0x0022561b
22
23#define MII_AM79C_IR		17	/* Interrupt Status/Control Register */
24#define MII_AM79C_IR_EN_LINK	0x0400	/* IR enable Linkstate */
25#define MII_AM79C_IR_EN_ANEG	0x0100	/* IR enable Aneg Complete */
26#define MII_AM79C_IR_IMASK_INIT	(MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG)
27
28MODULE_DESCRIPTION("AMD PHY driver");
29MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
30MODULE_LICENSE("GPL");
31
32static int am79c_ack_interrupt(struct phy_device *phydev)
33{
34	int err;
35
36	err = phy_read(phydev, MII_BMSR);
37	if (err < 0)
38		return err;
39
40	err = phy_read(phydev, MII_AM79C_IR);
41	if (err < 0)
42		return err;
43
44	return 0;
45}
46
47static int am79c_config_init(struct phy_device *phydev)
48{
49	return 0;
50}
51
52static int am79c_config_intr(struct phy_device *phydev)
53{
54	int err;
55
56	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
57		err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT);
58	else
59		err = phy_write(phydev, MII_AM79C_IR, 0);
60
61	return err;
62}
63
64static struct phy_driver am79c_driver[] = { {
65	.phy_id		= PHY_ID_AM79C874,
66	.name		= "AM79C874",
67	.phy_id_mask	= 0xfffffff0,
68	.features	= PHY_BASIC_FEATURES,
69	.flags		= PHY_HAS_INTERRUPT,
70	.config_init	= am79c_config_init,
71	.ack_interrupt	= am79c_ack_interrupt,
72	.config_intr	= am79c_config_intr,
73} };
74
75module_phy_driver(am79c_driver);
76
77static struct mdio_device_id __maybe_unused amd_tbl[] = {
78	{ PHY_ID_AM79C874, 0xfffffff0 },
79	{ }
80};
81
82MODULE_DEVICE_TABLE(mdio, amd_tbl);