1 /*
2 * Copyright (C) 2015 Microchip Technology
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 */
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/mii.h>
20 #include <linux/ethtool.h>
21 #include <linux/phy.h>
22 #include <linux/microchipphy.h>
23
24 #define DRIVER_AUTHOR "WOOJUNG HUH <woojung.huh@microchip.com>"
25 #define DRIVER_DESC "Microchip LAN88XX PHY driver"
26
27 struct lan88xx_priv {
28 int chip_id;
29 int chip_rev;
30 __u32 wolopts;
31 };
32
lan88xx_phy_config_intr(struct phy_device * phydev)33 static int lan88xx_phy_config_intr(struct phy_device *phydev)
34 {
35 int rc;
36
37 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
38 /* unmask all source and clear them before enable */
39 rc = phy_write(phydev, LAN88XX_INT_MASK, 0x7FFF);
40 rc = phy_read(phydev, LAN88XX_INT_STS);
41 rc = phy_write(phydev, LAN88XX_INT_MASK,
42 LAN88XX_INT_MASK_MDINTPIN_EN_ |
43 LAN88XX_INT_MASK_LINK_CHANGE_);
44 } else {
45 rc = phy_write(phydev, LAN88XX_INT_MASK, 0);
46 }
47
48 return rc < 0 ? rc : 0;
49 }
50
lan88xx_phy_ack_interrupt(struct phy_device * phydev)51 static int lan88xx_phy_ack_interrupt(struct phy_device *phydev)
52 {
53 int rc = phy_read(phydev, LAN88XX_INT_STS);
54
55 return rc < 0 ? rc : 0;
56 }
57
lan88xx_suspend(struct phy_device * phydev)58 int lan88xx_suspend(struct phy_device *phydev)
59 {
60 struct lan88xx_priv *priv = phydev->priv;
61
62 /* do not power down PHY when WOL is enabled */
63 if (!priv->wolopts)
64 genphy_suspend(phydev);
65
66 return 0;
67 }
68
lan88xx_probe(struct phy_device * phydev)69 static int lan88xx_probe(struct phy_device *phydev)
70 {
71 struct device *dev = &phydev->dev;
72 struct lan88xx_priv *priv;
73
74 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
75 if (!priv)
76 return -ENOMEM;
77
78 priv->wolopts = 0;
79
80 /* these values can be used to identify internal PHY */
81 priv->chip_id = phy_read_mmd_indirect(phydev, LAN88XX_MMD3_CHIP_ID,
82 3, phydev->addr);
83 priv->chip_rev = phy_read_mmd_indirect(phydev, LAN88XX_MMD3_CHIP_REV,
84 3, phydev->addr);
85
86 phydev->priv = priv;
87
88 return 0;
89 }
90
lan88xx_remove(struct phy_device * phydev)91 static void lan88xx_remove(struct phy_device *phydev)
92 {
93 struct device *dev = &phydev->dev;
94 struct lan88xx_priv *priv = phydev->priv;
95
96 if (priv)
97 devm_kfree(dev, priv);
98 }
99
lan88xx_set_wol(struct phy_device * phydev,struct ethtool_wolinfo * wol)100 static int lan88xx_set_wol(struct phy_device *phydev,
101 struct ethtool_wolinfo *wol)
102 {
103 struct lan88xx_priv *priv = phydev->priv;
104
105 priv->wolopts = wol->wolopts;
106
107 return 0;
108 }
109
110 static struct phy_driver microchip_phy_driver[] = {
111 {
112 .phy_id = 0x0007c130,
113 .phy_id_mask = 0xfffffff0,
114 .name = "Microchip LAN88xx",
115
116 .features = (PHY_GBIT_FEATURES |
117 SUPPORTED_Pause | SUPPORTED_Asym_Pause),
118 .flags = PHY_HAS_INTERRUPT | PHY_HAS_MAGICANEG,
119
120 .probe = lan88xx_probe,
121 .remove = lan88xx_remove,
122
123 .config_init = genphy_config_init,
124 .config_aneg = genphy_config_aneg,
125 .read_status = genphy_read_status,
126
127 .ack_interrupt = lan88xx_phy_ack_interrupt,
128 .config_intr = lan88xx_phy_config_intr,
129
130 .suspend = lan88xx_suspend,
131 .resume = genphy_resume,
132 .set_wol = lan88xx_set_wol,
133
134 .driver = { .owner = THIS_MODULE, }
135 } };
136
137 module_phy_driver(microchip_phy_driver);
138
139 static struct mdio_device_id __maybe_unused microchip_tbl[] = {
140 { 0x0007c130, 0xfffffff0 },
141 { }
142 };
143
144 MODULE_DEVICE_TABLE(mdio, microchip_tbl);
145
146 MODULE_AUTHOR(DRIVER_AUTHOR);
147 MODULE_DESCRIPTION(DRIVER_DESC);
148 MODULE_LICENSE("GPL");
149