1/*
 2 * Driver for Teranetics PHY
 3 *
 4 * Author: Shaohui Xie <Shaohui.Xie@freescale.com>
 5 *
 6 * Copyright 2015 Freescale Semiconductor, Inc.
 7 *
 8 * This file is licensed under the terms of the GNU General Public License
 9 * version 2.  This program is licensed "as is" without any warranty of any
10 * kind, whether express or implied.
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/mii.h>
16#include <linux/ethtool.h>
17#include <linux/mdio.h>
18#include <linux/phy.h>
19
20MODULE_DESCRIPTION("Teranetics PHY driver");
21MODULE_AUTHOR("Shaohui Xie <Shaohui.Xie@freescale.com>");
22MODULE_LICENSE("GPL v2");
23
24#define PHY_ID_TN2020	0x00a19410
25#define MDIO_PHYXS_LNSTAT_SYNC0	0x0001
26#define MDIO_PHYXS_LNSTAT_SYNC1	0x0002
27#define MDIO_PHYXS_LNSTAT_SYNC2	0x0004
28#define MDIO_PHYXS_LNSTAT_SYNC3	0x0008
29#define MDIO_PHYXS_LNSTAT_ALIGN 0x1000
30
31#define MDIO_PHYXS_LANE_READY	(MDIO_PHYXS_LNSTAT_SYNC0 | \
32				MDIO_PHYXS_LNSTAT_SYNC1 | \
33				MDIO_PHYXS_LNSTAT_SYNC2 | \
34				MDIO_PHYXS_LNSTAT_SYNC3 | \
35				MDIO_PHYXS_LNSTAT_ALIGN)
36
37static int teranetics_aneg_done(struct phy_device *phydev)
38{
39	/* auto negotiation state can only be checked when using copper
40	 * port, if using fiber port, just lie it's done.
41	 */
42	if (!phy_read_mmd(phydev, MDIO_MMD_VEND1, 93))
43		return genphy_c45_aneg_done(phydev);
44
45	return 1;
46}
47
48static int teranetics_read_status(struct phy_device *phydev)
49{
50	int reg;
51
52	phydev->link = 1;
53
54	phydev->speed = SPEED_10000;
55	phydev->duplex = DUPLEX_FULL;
56
57	if (!phy_read_mmd(phydev, MDIO_MMD_VEND1, 93)) {
58		reg = phy_read_mmd(phydev, MDIO_MMD_PHYXS, MDIO_PHYXS_LNSTAT);
59		if (reg < 0 ||
60		    !((reg & MDIO_PHYXS_LANE_READY) == MDIO_PHYXS_LANE_READY)) {
61			phydev->link = 0;
62			return 0;
63		}
64
65		reg = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
66		if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS))
67			phydev->link = 0;
68	}
69
70	return 0;
71}
72
73static int teranetics_match_phy_device(struct phy_device *phydev)
74{
75	return phydev->c45_ids.device_ids[3] == PHY_ID_TN2020;
76}
77
78static struct phy_driver teranetics_driver[] = {
79{
80	.phy_id		= PHY_ID_TN2020,
81	.phy_id_mask	= 0xffffffff,
82	.name		= "Teranetics TN2020",
83	.soft_reset	= gen10g_no_soft_reset,
84	.aneg_done	= teranetics_aneg_done,
85	.config_init    = gen10g_config_init,
86	.config_aneg    = gen10g_config_aneg,
87	.read_status	= teranetics_read_status,
88	.match_phy_device = teranetics_match_phy_device,
89},
90};
91
92module_phy_driver(teranetics_driver);
93
94static struct mdio_device_id __maybe_unused teranetics_tbl[] = {
95	{ PHY_ID_TN2020, 0xffffffff },
96	{ }
97};
98
99MODULE_DEVICE_TABLE(mdio, teranetics_tbl);