xref: /openbmc/linux/drivers/net/phy/ste10Xp.c (revision ae40e94f)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * drivers/net/phy/ste10Xp.c
4  *
5  * Driver for STMicroelectronics STe10Xp PHYs
6  *
7  * Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
8  *
9  * Copyright (c) 2008 STMicroelectronics Limited
10  */
11 
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/moduleparam.h>
17 #include <linux/interrupt.h>
18 #include <linux/netdevice.h>
19 #include <linux/ethtool.h>
20 #include <linux/mii.h>
21 #include <linux/phy.h>
22 
23 #define MII_XCIIS   	0x11	/* Configuration Info IRQ & Status Reg */
24 #define MII_XIE     	0x12	/* Interrupt Enable Register */
25 #define MII_XIE_DEFAULT_MASK 0x0070 /* ANE complete, Remote Fault, Link Down */
26 
27 #define STE101P_PHY_ID		0x00061c50
28 #define STE100P_PHY_ID       	0x1c040011
29 
30 static int ste10Xp_config_init(struct phy_device *phydev)
31 {
32 	int value, err;
33 
34 	/* Software Reset PHY */
35 	value = phy_read(phydev, MII_BMCR);
36 	if (value < 0)
37 		return value;
38 
39 	value |= BMCR_RESET;
40 	err = phy_write(phydev, MII_BMCR, value);
41 	if (err < 0)
42 		return err;
43 
44 	do {
45 		value = phy_read(phydev, MII_BMCR);
46 	} while (value & BMCR_RESET);
47 
48 	return 0;
49 }
50 
51 static int ste10Xp_config_intr(struct phy_device *phydev)
52 {
53 	int err, value;
54 
55 	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
56 		/* Enable all STe101P interrupts (PR12) */
57 		err = phy_write(phydev, MII_XIE, MII_XIE_DEFAULT_MASK);
58 		/* clear any pending interrupts */
59 		if (err == 0) {
60 			value = phy_read(phydev, MII_XCIIS);
61 			if (value < 0)
62 				err = value;
63 		}
64 	} else
65 		err = phy_write(phydev, MII_XIE, 0);
66 
67 	return err;
68 }
69 
70 static int ste10Xp_ack_interrupt(struct phy_device *phydev)
71 {
72 	int err = phy_read(phydev, MII_XCIIS);
73 	if (err < 0)
74 		return err;
75 
76 	return 0;
77 }
78 
79 static struct phy_driver ste10xp_pdriver[] = {
80 {
81 	.phy_id = STE101P_PHY_ID,
82 	.phy_id_mask = 0xfffffff0,
83 	.name = "STe101p",
84 	.features = PHY_BASIC_FEATURES,
85 	.config_init = ste10Xp_config_init,
86 	.ack_interrupt = ste10Xp_ack_interrupt,
87 	.config_intr = ste10Xp_config_intr,
88 	.suspend = genphy_suspend,
89 	.resume = genphy_resume,
90 }, {
91 	.phy_id = STE100P_PHY_ID,
92 	.phy_id_mask = 0xffffffff,
93 	.name = "STe100p",
94 	.features = PHY_BASIC_FEATURES,
95 	.config_init = ste10Xp_config_init,
96 	.ack_interrupt = ste10Xp_ack_interrupt,
97 	.config_intr = ste10Xp_config_intr,
98 	.suspend = genphy_suspend,
99 	.resume = genphy_resume,
100 } };
101 
102 module_phy_driver(ste10xp_pdriver);
103 
104 static struct mdio_device_id __maybe_unused ste10Xp_tbl[] = {
105 	{ STE101P_PHY_ID, 0xfffffff0 },
106 	{ STE100P_PHY_ID, 0xffffffff },
107 	{ }
108 };
109 
110 MODULE_DEVICE_TABLE(mdio, ste10Xp_tbl);
111 
112 MODULE_DESCRIPTION("STMicroelectronics STe10Xp PHY driver");
113 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
114 MODULE_LICENSE("GPL");
115