tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Driver for the Renesas PHY uPD60620.
3 *
4 * Copyright (C) 2015 Softing Industrial Automation GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/phy.h>
16
17#define UPD60620_PHY_ID 0xb8242824
18
19/* Extended Registers and values */
20/* PHY Special Control/Status */
21#define PHY_PHYSCR 0x1F /* PHY.31 */
22#define PHY_PHYSCR_10MB 0x0004 /* PHY speed = 10mb */
23#define PHY_PHYSCR_100MB 0x0008 /* PHY speed = 100mb */
24#define PHY_PHYSCR_DUPLEX 0x0010 /* PHY Duplex */
25
26/* PHY Special Modes */
27#define PHY_SPM 0x12 /* PHY.18 */
28
29/* Init PHY */
30
31static int upd60620_config_init(struct phy_device *phydev)
32{
33 /* Enable support for passive HUBs (could be a strap option) */
34 /* PHYMODE: All speeds, HD in parallel detect */
35 return phy_write(phydev, PHY_SPM, 0x0180 | phydev->mdio.addr);
36}
37
38/* Get PHY status from common registers */
39
40static int upd60620_read_status(struct phy_device *phydev)
41{
42 int phy_state;
43
44 /* Read negotiated state */
45 phy_state = phy_read(phydev, MII_BMSR);
46 if (phy_state < 0)
47 return phy_state;
48
49 phydev->link = 0;
50 phydev->lp_advertising = 0;
51 phydev->pause = 0;
52 phydev->asym_pause = 0;
53
54 if (phy_state & (BMSR_ANEGCOMPLETE | BMSR_LSTATUS)) {
55 phy_state = phy_read(phydev, PHY_PHYSCR);
56 if (phy_state < 0)
57 return phy_state;
58
59 if (phy_state & (PHY_PHYSCR_10MB | PHY_PHYSCR_100MB)) {
60 phydev->link = 1;
61 phydev->speed = SPEED_10;
62 phydev->duplex = DUPLEX_HALF;
63
64 if (phy_state & PHY_PHYSCR_100MB)
65 phydev->speed = SPEED_100;
66 if (phy_state & PHY_PHYSCR_DUPLEX)
67 phydev->duplex = DUPLEX_FULL;
68
69 phy_state = phy_read(phydev, MII_LPA);
70 if (phy_state < 0)
71 return phy_state;
72
73 phydev->lp_advertising
74 = mii_lpa_to_ethtool_lpa_t(phy_state);
75
76 if (phydev->duplex == DUPLEX_FULL) {
77 if (phy_state & LPA_PAUSE_CAP)
78 phydev->pause = 1;
79 if (phy_state & LPA_PAUSE_ASYM)
80 phydev->asym_pause = 1;
81 }
82 }
83 }
84 return 0;
85}
86
87MODULE_DESCRIPTION("Renesas uPD60620 PHY driver");
88MODULE_AUTHOR("Bernd Edlinger <bernd.edlinger@hotmail.de>");
89MODULE_LICENSE("GPL");
90
91static struct phy_driver upd60620_driver[1] = { {
92 .phy_id = UPD60620_PHY_ID,
93 .phy_id_mask = 0xfffffffe,
94 .name = "Renesas uPD60620",
95 .features = PHY_BASIC_FEATURES,
96 .flags = 0,
97 .config_init = upd60620_config_init,
98 .config_aneg = genphy_config_aneg,
99 .read_status = upd60620_read_status,
100} };
101
102module_phy_driver(upd60620_driver);
103
104static struct mdio_device_id __maybe_unused upd60620_tbl[] = {
105 { UPD60620_PHY_ID, 0xfffffffe },
106 { }
107};
108
109MODULE_DEVICE_TABLE(mdio, upd60620_tbl);