1/*
2 * drivers/net/phy/davicom.c
3 *
4 * Driver for Davicom PHYs
5 *
6 * Author: Andy Fleming
7 *
8 * Copyright (c) 2004 Freescale Semiconductor, Inc.
9 *
10 * This program is free software; you can redistribute  it and/or modify it
11 * under  the terms of  the GNU General  Public License as published by the
12 * Free Software Foundation;  either version 2 of the  License, or (at your
13 * option) any later version.
14 *
15 */
16#include <linux/kernel.h>
17#include <linux/string.h>
18#include <linux/errno.h>
19#include <linux/unistd.h>
20#include <linux/interrupt.h>
21#include <linux/init.h>
22#include <linux/delay.h>
23#include <linux/netdevice.h>
24#include <linux/etherdevice.h>
25#include <linux/skbuff.h>
26#include <linux/spinlock.h>
27#include <linux/mm.h>
28#include <linux/module.h>
29#include <linux/mii.h>
30#include <linux/ethtool.h>
31#include <linux/phy.h>
32
33#include <asm/io.h>
34#include <asm/irq.h>
35#include <asm/uaccess.h>
36
37#define MII_DM9161_SCR		0x10
38#define MII_DM9161_SCR_INIT	0x0610
39#define MII_DM9161_SCR_RMII	0x0100
40
41/* DM9161 Interrupt Register */
42#define MII_DM9161_INTR	0x15
43#define MII_DM9161_INTR_PEND		0x8000
44#define MII_DM9161_INTR_DPLX_MASK	0x0800
45#define MII_DM9161_INTR_SPD_MASK	0x0400
46#define MII_DM9161_INTR_LINK_MASK	0x0200
47#define MII_DM9161_INTR_MASK		0x0100
48#define MII_DM9161_INTR_DPLX_CHANGE	0x0010
49#define MII_DM9161_INTR_SPD_CHANGE	0x0008
50#define MII_DM9161_INTR_LINK_CHANGE	0x0004
51#define MII_DM9161_INTR_INIT 		0x0000
52#define MII_DM9161_INTR_STOP	\
53(MII_DM9161_INTR_DPLX_MASK | MII_DM9161_INTR_SPD_MASK \
54 | MII_DM9161_INTR_LINK_MASK | MII_DM9161_INTR_MASK)
55
56/* DM9161 10BT Configuration/Status */
57#define MII_DM9161_10BTCSR	0x12
58#define MII_DM9161_10BTCSR_INIT	0x7800
59
60MODULE_DESCRIPTION("Davicom PHY driver");
61MODULE_AUTHOR("Andy Fleming");
62MODULE_LICENSE("GPL");
63
64
65#define DM9161_DELAY 1
66static int dm9161_config_intr(struct phy_device *phydev)
67{
68	int temp;
69
70	temp = phy_read(phydev, MII_DM9161_INTR);
71
72	if (temp < 0)
73		return temp;
74
75	if (PHY_INTERRUPT_ENABLED == phydev->interrupts)
76		temp &= ~(MII_DM9161_INTR_STOP);
77	else
78		temp |= MII_DM9161_INTR_STOP;
79
80	temp = phy_write(phydev, MII_DM9161_INTR, temp);
81
82	return temp;
83}
84
85static int dm9161_config_aneg(struct phy_device *phydev)
86{
87	int err;
88
89	/* Isolate the PHY */
90	err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE);
91
92	if (err < 0)
93		return err;
94
95	/* Configure the new settings */
96	err = genphy_config_aneg(phydev);
97
98	if (err < 0)
99		return err;
100
101	return 0;
102}
103
104static int dm9161_config_init(struct phy_device *phydev)
105{
106	int err, temp;
107
108	/* Isolate the PHY */
109	err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE);
110
111	if (err < 0)
112		return err;
113
114	switch (phydev->interface) {
115	case PHY_INTERFACE_MODE_MII:
116		temp = MII_DM9161_SCR_INIT;
117		break;
118	case PHY_INTERFACE_MODE_RMII:
119		temp =  MII_DM9161_SCR_INIT | MII_DM9161_SCR_RMII;
120		break;
121	default:
122		return -EINVAL;
123	}
124
125	/* Do not bypass the scrambler/descrambler */
126	err = phy_write(phydev, MII_DM9161_SCR, temp);
127	if (err < 0)
128		return err;
129
130	/* Clear 10BTCSR to default */
131	err = phy_write(phydev, MII_DM9161_10BTCSR, MII_DM9161_10BTCSR_INIT);
132
133	if (err < 0)
134		return err;
135
136	/* Reconnect the PHY, and enable Autonegotiation */
137	return phy_write(phydev, MII_BMCR, BMCR_ANENABLE);
138}
139
140static int dm9161_ack_interrupt(struct phy_device *phydev)
141{
142	int err = phy_read(phydev, MII_DM9161_INTR);
143
144	return (err < 0) ? err : 0;
145}
146
147static struct phy_driver dm91xx_driver[] = {
148{
149	.phy_id		= 0x0181b880,
150	.name		= "Davicom DM9161E",
151	.phy_id_mask	= 0x0ffffff0,
152	.features	= PHY_BASIC_FEATURES,
153	.flags		= PHY_HAS_INTERRUPT,
154	.config_init	= dm9161_config_init,
155	.config_aneg	= dm9161_config_aneg,
156	.read_status	= genphy_read_status,
157	.ack_interrupt	= dm9161_ack_interrupt,
158	.config_intr	= dm9161_config_intr,
159	.driver		= { .owner = THIS_MODULE,},
160}, {
161	.phy_id		= 0x0181b8a0,
162	.name		= "Davicom DM9161A",
163	.phy_id_mask	= 0x0ffffff0,
164	.features	= PHY_BASIC_FEATURES,
165	.flags		= PHY_HAS_INTERRUPT,
166	.config_init	= dm9161_config_init,
167	.config_aneg	= dm9161_config_aneg,
168	.read_status	= genphy_read_status,
169	.ack_interrupt	= dm9161_ack_interrupt,
170	.config_intr	= dm9161_config_intr,
171	.driver		= { .owner = THIS_MODULE,},
172}, {
173	.phy_id		= 0x00181b80,
174	.name		= "Davicom DM9131",
175	.phy_id_mask	= 0x0ffffff0,
176	.features	= PHY_BASIC_FEATURES,
177	.flags		= PHY_HAS_INTERRUPT,
178	.config_aneg	= genphy_config_aneg,
179	.read_status	= genphy_read_status,
180	.ack_interrupt	= dm9161_ack_interrupt,
181	.config_intr	= dm9161_config_intr,
182	.driver		= { .owner = THIS_MODULE,},
183} };
184
185module_phy_driver(dm91xx_driver);
186
187static struct mdio_device_id __maybe_unused davicom_tbl[] = {
188	{ 0x0181b880, 0x0ffffff0 },
189	{ 0x0181b8a0, 0x0ffffff0 },
190	{ 0x00181b80, 0x0ffffff0 },
191	{ }
192};
193
194MODULE_DEVICE_TABLE(mdio, davicom_tbl);
195