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 
17 MODULE_DESCRIPTION("Teranetics PHY driver");
18 MODULE_AUTHOR("Shaohui Xie <Shaohui.Xie@freescale.com>");
19 MODULE_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 
teranetics_aneg_done(struct phy_device * phydev)34 static 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 
teranetics_read_status(struct phy_device * phydev)45 static 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 
teranetics_match_phy_device(struct phy_device * phydev)70 static int teranetics_match_phy_device(struct phy_device *phydev)
71 {
72 	return phydev->c45_ids.device_ids[3] == PHY_ID_TN2020;
73 }
74 
75 static 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 
88 module_phy_driver(teranetics_driver);
89 
90 static struct mdio_device_id __maybe_unused teranetics_tbl[] = {
91 	{ PHY_ID_TN2020, 0xffffffff },
92 	{ }
93 };
94 
95 MODULE_DEVICE_TABLE(mdio, teranetics_tbl);
96