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 Vitesse PHYs
3 *
4 * Author: Kriston Carson
5 *
6 * Copyright (c) 2005 Freescale Semiconductor, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/mii.h>
18#include <linux/ethtool.h>
19#include <linux/phy.h>
20
21/* Vitesse Extended Control Register 1 */
22#define MII_VSC8244_EXT_CON1 0x17
23#define MII_VSC8244_EXTCON1_INIT 0x0000
24#define MII_VSC8244_EXTCON1_TX_SKEW_MASK 0x0c00
25#define MII_VSC8244_EXTCON1_RX_SKEW_MASK 0x0300
26#define MII_VSC8244_EXTCON1_TX_SKEW 0x0800
27#define MII_VSC8244_EXTCON1_RX_SKEW 0x0200
28
29/* Vitesse Interrupt Mask Register */
30#define MII_VSC8244_IMASK 0x19
31#define MII_VSC8244_IMASK_IEN 0x8000
32#define MII_VSC8244_IMASK_SPEED 0x4000
33#define MII_VSC8244_IMASK_LINK 0x2000
34#define MII_VSC8244_IMASK_DUPLEX 0x1000
35#define MII_VSC8244_IMASK_MASK 0xf000
36
37/* Vitesse Interrupt Status Register */
38#define MII_VSC8244_ISTAT 0x1a
39#define MII_VSC8244_ISTAT_STATUS 0x8000
40#define MII_VSC8244_ISTAT_SPEED 0x4000
41#define MII_VSC8244_ISTAT_LINK 0x2000
42#define MII_VSC8244_ISTAT_DUPLEX 0x1000
43
44/* Vitesse Auxiliary Control/Status Register */
45#define MII_VSC8244_AUX_CONSTAT 0x1c
46#define MII_VSC8244_AUXCONSTAT_INIT 0x0000
47#define MII_VSC8244_AUXCONSTAT_DUPLEX 0x0020
48#define MII_VSC8244_AUXCONSTAT_SPEED 0x0018
49#define MII_VSC8244_AUXCONSTAT_GBIT 0x0010
50#define MII_VSC8244_AUXCONSTAT_100 0x0008
51
52MODULE_DESCRIPTION("Vitesse PHY driver");
53MODULE_AUTHOR("Kriston Carson");
54MODULE_LICENSE("GPL");
55
56static int vsc824x_config_init(struct phy_device *phydev)
57{
58 int extcon;
59 int err;
60
61 err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
62 MII_VSC8244_AUXCONSTAT_INIT);
63 if (err < 0)
64 return err;
65
66 extcon = phy_read(phydev, MII_VSC8244_EXT_CON1);
67
68 if (extcon < 0)
69 return err;
70
71 extcon &= ~(MII_VSC8244_EXTCON1_TX_SKEW_MASK |
72 MII_VSC8244_EXTCON1_RX_SKEW_MASK);
73
74 if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
75 extcon |= (MII_VSC8244_EXTCON1_TX_SKEW |
76 MII_VSC8244_EXTCON1_RX_SKEW);
77
78 err = phy_write(phydev, MII_VSC8244_EXT_CON1, extcon);
79
80 return err;
81}
82
83static int vsc824x_ack_interrupt(struct phy_device *phydev)
84{
85 int err = 0;
86
87 /*
88 * Don't bother to ACK the interrupts if interrupts
89 * are disabled. The 824x cannot clear the interrupts
90 * if they are disabled.
91 */
92 if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
93 err = phy_read(phydev, MII_VSC8244_ISTAT);
94
95 return (err < 0) ? err : 0;
96}
97
98static int vsc824x_config_intr(struct phy_device *phydev)
99{
100 int err;
101
102 if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
103 err = phy_write(phydev, MII_VSC8244_IMASK,
104 MII_VSC8244_IMASK_MASK);
105 else {
106 /*
107 * The Vitesse PHY cannot clear the interrupt
108 * once it has disabled them, so we clear them first
109 */
110 err = phy_read(phydev, MII_VSC8244_ISTAT);
111
112 if (err < 0)
113 return err;
114
115 err = phy_write(phydev, MII_VSC8244_IMASK, 0);
116 }
117
118 return err;
119}
120
121/* Vitesse 824x */
122static struct phy_driver vsc8244_driver = {
123 .phy_id = 0x000fc6c0,
124 .name = "Vitesse VSC8244",
125 .phy_id_mask = 0x000fffc0,
126 .features = PHY_GBIT_FEATURES,
127 .flags = PHY_HAS_INTERRUPT,
128 .config_init = &vsc824x_config_init,
129 .config_aneg = &genphy_config_aneg,
130 .read_status = &genphy_read_status,
131 .ack_interrupt = &vsc824x_ack_interrupt,
132 .config_intr = &vsc824x_config_intr,
133 .driver = { .owner = THIS_MODULE,},
134};
135
136static int __init vsc8244_init(void)
137{
138 return phy_driver_register(&vsc8244_driver);
139}
140
141static void __exit vsc8244_exit(void)
142{
143 phy_driver_unregister(&vsc8244_driver);
144}
145
146module_init(vsc8244_init);
147module_exit(vsc8244_exit);