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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * drivers/net/phy/cicada.c
4 *
5 * Driver for Cicada PHYs
6 *
7 * Author: Andy Fleming
8 *
9 * Copyright (c) 2004 Freescale Semiconductor, Inc.
10 */
11#include <linux/kernel.h>
12#include <linux/string.h>
13#include <linux/errno.h>
14#include <linux/unistd.h>
15#include <linux/interrupt.h>
16#include <linux/init.h>
17#include <linux/delay.h>
18#include <linux/netdevice.h>
19#include <linux/etherdevice.h>
20#include <linux/skbuff.h>
21#include <linux/spinlock.h>
22#include <linux/mm.h>
23#include <linux/module.h>
24#include <linux/mii.h>
25#include <linux/ethtool.h>
26#include <linux/phy.h>
27
28#include <linux/io.h>
29#include <asm/irq.h>
30#include <linux/uaccess.h>
31
32/* Cicada Extended Control Register 1 */
33#define MII_CIS8201_EXT_CON1 0x17
34#define MII_CIS8201_EXTCON1_INIT 0x0000
35
36/* Cicada Interrupt Mask Register */
37#define MII_CIS8201_IMASK 0x19
38#define MII_CIS8201_IMASK_IEN 0x8000
39#define MII_CIS8201_IMASK_SPEED 0x4000
40#define MII_CIS8201_IMASK_LINK 0x2000
41#define MII_CIS8201_IMASK_DUPLEX 0x1000
42#define MII_CIS8201_IMASK_MASK 0xf000
43
44/* Cicada Interrupt Status Register */
45#define MII_CIS8201_ISTAT 0x1a
46#define MII_CIS8201_ISTAT_STATUS 0x8000
47#define MII_CIS8201_ISTAT_SPEED 0x4000
48#define MII_CIS8201_ISTAT_LINK 0x2000
49#define MII_CIS8201_ISTAT_DUPLEX 0x1000
50
51/* Cicada Auxiliary Control/Status Register */
52#define MII_CIS8201_AUX_CONSTAT 0x1c
53#define MII_CIS8201_AUXCONSTAT_INIT 0x0004
54#define MII_CIS8201_AUXCONSTAT_DUPLEX 0x0020
55#define MII_CIS8201_AUXCONSTAT_SPEED 0x0018
56#define MII_CIS8201_AUXCONSTAT_GBIT 0x0010
57#define MII_CIS8201_AUXCONSTAT_100 0x0008
58
59MODULE_DESCRIPTION("Cicadia PHY driver");
60MODULE_AUTHOR("Andy Fleming");
61MODULE_LICENSE("GPL");
62
63static int cis820x_config_init(struct phy_device *phydev)
64{
65 int err;
66
67 err = phy_write(phydev, MII_CIS8201_AUX_CONSTAT,
68 MII_CIS8201_AUXCONSTAT_INIT);
69
70 if (err < 0)
71 return err;
72
73 err = phy_write(phydev, MII_CIS8201_EXT_CON1,
74 MII_CIS8201_EXTCON1_INIT);
75
76 return err;
77}
78
79static int cis820x_ack_interrupt(struct phy_device *phydev)
80{
81 int err = phy_read(phydev, MII_CIS8201_ISTAT);
82
83 return (err < 0) ? err : 0;
84}
85
86static int cis820x_config_intr(struct phy_device *phydev)
87{
88 int err;
89
90 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
91 err = cis820x_ack_interrupt(phydev);
92 if (err)
93 return err;
94
95 err = phy_write(phydev, MII_CIS8201_IMASK,
96 MII_CIS8201_IMASK_MASK);
97 } else {
98 err = phy_write(phydev, MII_CIS8201_IMASK, 0);
99 if (err)
100 return err;
101
102 err = cis820x_ack_interrupt(phydev);
103 }
104
105 return err;
106}
107
108static irqreturn_t cis820x_handle_interrupt(struct phy_device *phydev)
109{
110 int irq_status;
111
112 irq_status = phy_read(phydev, MII_CIS8201_ISTAT);
113 if (irq_status < 0) {
114 phy_error(phydev);
115 return IRQ_NONE;
116 }
117
118 if (!(irq_status & MII_CIS8201_IMASK_MASK))
119 return IRQ_NONE;
120
121 phy_trigger_machine(phydev);
122
123 return IRQ_HANDLED;
124}
125
126/* Cicada 8201, a.k.a Vitesse VSC8201 */
127static struct phy_driver cis820x_driver[] = {
128{
129 .phy_id = 0x000fc410,
130 .name = "Cicada Cis8201",
131 .phy_id_mask = 0x000ffff0,
132 /* PHY_GBIT_FEATURES */
133 .config_init = &cis820x_config_init,
134 .config_intr = &cis820x_config_intr,
135 .handle_interrupt = &cis820x_handle_interrupt,
136}, {
137 .phy_id = 0x000fc440,
138 .name = "Cicada Cis8204",
139 .phy_id_mask = 0x000fffc0,
140 /* PHY_GBIT_FEATURES */
141 .config_init = &cis820x_config_init,
142 .config_intr = &cis820x_config_intr,
143 .handle_interrupt = &cis820x_handle_interrupt,
144} };
145
146module_phy_driver(cis820x_driver);
147
148static const struct mdio_device_id __maybe_unused cicada_tbl[] = {
149 { 0x000fc410, 0x000ffff0 },
150 { 0x000fc440, 0x000fffc0 },
151 { }
152};
153
154MODULE_DEVICE_TABLE(mdio, cicada_tbl);