xref: /openbmc/linux/drivers/net/phy/cicada.c (revision a758087f)
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 
59 MODULE_DESCRIPTION("Cicadia PHY driver");
60 MODULE_AUTHOR("Andy Fleming");
61 MODULE_LICENSE("GPL");
62 
cis820x_config_init(struct phy_device * phydev)63 static 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 
cis820x_ack_interrupt(struct phy_device * phydev)79 static 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 
cis820x_config_intr(struct phy_device * phydev)86 static 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 
cis820x_handle_interrupt(struct phy_device * phydev)108 static 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 */
127 static 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 
146 module_phy_driver(cis820x_driver);
147 
148 static struct mdio_device_id __maybe_unused cicada_tbl[] = {
149 	{ 0x000fc410, 0x000ffff0 },
150 	{ 0x000fc440, 0x000fffc0 },
151 	{ }
152 };
153 
154 MODULE_DEVICE_TABLE(mdio, cicada_tbl);
155