1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Driver for the Renesas PHY uPD60620.
4 *
5 * Copyright (C) 2015 Softing Industrial Automation GmbH
6 */
7
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/phy.h>
11
12#define UPD60620_PHY_ID    0xb8242824
13
14/* Extended Registers and values */
15/* PHY Special Control/Status    */
16#define PHY_PHYSCR         0x1F      /* PHY.31 */
17#define PHY_PHYSCR_10MB    0x0004    /* PHY speed = 10mb */
18#define PHY_PHYSCR_100MB   0x0008    /* PHY speed = 100mb */
19#define PHY_PHYSCR_DUPLEX  0x0010    /* PHY Duplex */
20
21/* PHY Special Modes */
22#define PHY_SPM            0x12      /* PHY.18 */
23
24/* Init PHY */
25
26static int upd60620_config_init(struct phy_device *phydev)
27{
28	/* Enable support for passive HUBs (could be a strap option) */
29	/* PHYMODE: All speeds, HD in parallel detect */
30	return phy_write(phydev, PHY_SPM, 0x0180 | phydev->mdio.addr);
31}
32
33/* Get PHY status from common registers */
34
35static int upd60620_read_status(struct phy_device *phydev)
36{
37	int phy_state;
38
39	/* Read negotiated state */
40	phy_state = phy_read(phydev, MII_BMSR);
41	if (phy_state < 0)
42		return phy_state;
43
44	phydev->link = 0;
45	linkmode_zero(phydev->lp_advertising);
46	phydev->pause = 0;
47	phydev->asym_pause = 0;
48
49	if (phy_state & (BMSR_ANEGCOMPLETE | BMSR_LSTATUS)) {
50		phy_state = phy_read(phydev, PHY_PHYSCR);
51		if (phy_state < 0)
52			return phy_state;
53
54		if (phy_state & (PHY_PHYSCR_10MB | PHY_PHYSCR_100MB)) {
55			phydev->link = 1;
56			phydev->speed = SPEED_10;
57			phydev->duplex = DUPLEX_HALF;
58
59			if (phy_state & PHY_PHYSCR_100MB)
60				phydev->speed = SPEED_100;
61			if (phy_state & PHY_PHYSCR_DUPLEX)
62				phydev->duplex = DUPLEX_FULL;
63
64			phy_state = phy_read(phydev, MII_LPA);
65			if (phy_state < 0)
66				return phy_state;
67
68			mii_lpa_to_linkmode_lpa_t(phydev->lp_advertising,
69						  phy_state);
70
71			phy_resolve_aneg_pause(phydev);
72		}
73	}
74	return 0;
75}
76
77MODULE_DESCRIPTION("Renesas uPD60620 PHY driver");
78MODULE_AUTHOR("Bernd Edlinger <bernd.edlinger@hotmail.de>");
79MODULE_LICENSE("GPL");
80
81static struct phy_driver upd60620_driver[1] = { {
82	.phy_id         = UPD60620_PHY_ID,
83	.phy_id_mask    = 0xfffffffe,
84	.name           = "Renesas uPD60620",
85	/* PHY_BASIC_FEATURES */
86	.flags          = 0,
87	.config_init    = upd60620_config_init,
88	.read_status    = upd60620_read_status,
89} };
90
91module_phy_driver(upd60620_driver);
92
93static struct mdio_device_id __maybe_unused upd60620_tbl[] = {
94	{ UPD60620_PHY_ID, 0xfffffffe },
95	{ }
96};
97
98MODULE_DEVICE_TABLE(mdio, upd60620_tbl);
99