1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Driver for Teranetics PHY
 4 *
 5 * Author: Shaohui Xie <Shaohui.Xie@freescale.com>
 6 *
 7 * Copyright 2015 Freescale Semiconductor, Inc.
 8 */
 9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/mii.h>
13#include <linux/ethtool.h>
14#include <linux/mdio.h>
15#include <linux/phy.h>
16
17MODULE_DESCRIPTION("Teranetics PHY driver");
18MODULE_AUTHOR("Shaohui Xie <Shaohui.Xie@freescale.com>");
19MODULE_LICENSE("GPL v2");
20
21#define PHY_ID_TN2020	0x00a19410
22#define MDIO_PHYXS_LNSTAT_SYNC0	0x0001
23#define MDIO_PHYXS_LNSTAT_SYNC1	0x0002
24#define MDIO_PHYXS_LNSTAT_SYNC2	0x0004
25#define MDIO_PHYXS_LNSTAT_SYNC3	0x0008
26#define MDIO_PHYXS_LNSTAT_ALIGN 0x1000
27
28#define MDIO_PHYXS_LANE_READY	(MDIO_PHYXS_LNSTAT_SYNC0 | \
29				MDIO_PHYXS_LNSTAT_SYNC1 | \
30				MDIO_PHYXS_LNSTAT_SYNC2 | \
31				MDIO_PHYXS_LNSTAT_SYNC3 | \
32				MDIO_PHYXS_LNSTAT_ALIGN)
33
34static int teranetics_aneg_done(struct phy_device *phydev)
35{
36	/* auto negotiation state can only be checked when using copper
37	 * port, if using fiber port, just lie it's done.
38	 */
39	if (!phy_read_mmd(phydev, MDIO_MMD_VEND1, 93))
40		return genphy_c45_aneg_done(phydev);
41
42	return 1;
43}
44
45static int teranetics_read_status(struct phy_device *phydev)
46{
47	int reg;
48
49	phydev->link = 1;
50
51	phydev->speed = SPEED_10000;
52	phydev->duplex = DUPLEX_FULL;
53
54	if (!phy_read_mmd(phydev, MDIO_MMD_VEND1, 93)) {
55		reg = phy_read_mmd(phydev, MDIO_MMD_PHYXS, MDIO_PHYXS_LNSTAT);
56		if (reg < 0 ||
57		    !((reg & MDIO_PHYXS_LANE_READY) == MDIO_PHYXS_LANE_READY)) {
58			phydev->link = 0;
59			return 0;
60		}
61
62		reg = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
63		if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS))
64			phydev->link = 0;
65	}
66
67	return 0;
68}
69
70static int teranetics_match_phy_device(struct phy_device *phydev)
71{
72	return phydev->c45_ids.device_ids[3] == PHY_ID_TN2020;
73}
74
75static struct phy_driver teranetics_driver[] = {
76{
77	.phy_id		= PHY_ID_TN2020,
78	.phy_id_mask	= 0xffffffff,
79	.name		= "Teranetics TN2020",
80	.features       = PHY_10GBIT_FEATURES,
81	.aneg_done	= teranetics_aneg_done,
82	.config_aneg    = gen10g_config_aneg,
83	.read_status	= teranetics_read_status,
84	.match_phy_device = teranetics_match_phy_device,
85},
86};
87
88module_phy_driver(teranetics_driver);
89
90static struct mdio_device_id __maybe_unused teranetics_tbl[] = {
91	{ PHY_ID_TN2020, 0xffffffff },
92	{ }
93};
94
95MODULE_DEVICE_TABLE(mdio, teranetics_tbl);