1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Driver for AMD am79c PHYs
4 *
5 * Author: Heiko Schocher <hs@denx.de>
6 *
7 * Copyright (c) 2011 DENX Software Engineering GmbH
8 */
9 #include <linux/kernel.h>
10 #include <linux/errno.h>
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/mii.h>
14 #include <linux/phy.h>
15
16 #define PHY_ID_AM79C874 0x0022561b
17
18 #define MII_AM79C_IR 17 /* Interrupt Status/Control Register */
19 #define MII_AM79C_IR_EN_LINK 0x0400 /* IR enable Linkstate */
20 #define MII_AM79C_IR_EN_ANEG 0x0100 /* IR enable Aneg Complete */
21 #define MII_AM79C_IR_IMASK_INIT (MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG)
22
23 MODULE_DESCRIPTION("AMD PHY driver");
24 MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
25 MODULE_LICENSE("GPL");
26
am79c_ack_interrupt(struct phy_device * phydev)27 static int am79c_ack_interrupt(struct phy_device *phydev)
28 {
29 int err;
30
31 err = phy_read(phydev, MII_BMSR);
32 if (err < 0)
33 return err;
34
35 err = phy_read(phydev, MII_AM79C_IR);
36 if (err < 0)
37 return err;
38
39 return 0;
40 }
41
am79c_config_init(struct phy_device * phydev)42 static int am79c_config_init(struct phy_device *phydev)
43 {
44 return 0;
45 }
46
am79c_config_intr(struct phy_device * phydev)47 static int am79c_config_intr(struct phy_device *phydev)
48 {
49 int err;
50
51 if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
52 err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT);
53 else
54 err = phy_write(phydev, MII_AM79C_IR, 0);
55
56 return err;
57 }
58
59 static struct phy_driver am79c_driver[] = { {
60 .phy_id = PHY_ID_AM79C874,
61 .name = "AM79C874",
62 .phy_id_mask = 0xfffffff0,
63 /* PHY_BASIC_FEATURES */
64 .config_init = am79c_config_init,
65 .ack_interrupt = am79c_ack_interrupt,
66 .config_intr = am79c_config_intr,
67 } };
68
69 module_phy_driver(am79c_driver);
70
71 static struct mdio_device_id __maybe_unused amd_tbl[] = {
72 { PHY_ID_AM79C874, 0xfffffff0 },
73 { }
74 };
75
76 MODULE_DEVICE_TABLE(mdio, amd_tbl);
77
