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_AC101L 0x00225520 |
17 | #define PHY_ID_AM79C874 0x0022561b |
18 | |
19 | #define MII_AM79C_IR 17 /* Interrupt Status/Control Register */ |
20 | #define MII_AM79C_IR_EN_LINK 0x0400 /* IR enable Linkstate */ |
21 | #define MII_AM79C_IR_EN_ANEG 0x0100 /* IR enable Aneg Complete */ |
22 | #define MII_AM79C_IR_IMASK_INIT (MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG) |
23 | |
24 | #define MII_AM79C_IR_LINK_DOWN BIT(2) |
25 | #define MII_AM79C_IR_ANEG_DONE BIT(0) |
26 | #define MII_AM79C_IR_IMASK_STAT (MII_AM79C_IR_LINK_DOWN | MII_AM79C_IR_ANEG_DONE) |
27 | |
28 | MODULE_DESCRIPTION("AMD PHY driver" ); |
29 | MODULE_AUTHOR("Heiko Schocher <hs@denx.de>" ); |
30 | MODULE_LICENSE("GPL" ); |
31 | |
32 | static int am79c_ack_interrupt(struct phy_device *phydev) |
33 | { |
34 | int err; |
35 | |
36 | err = phy_read(phydev, MII_BMSR); |
37 | if (err < 0) |
38 | return err; |
39 | |
40 | err = phy_read(phydev, MII_AM79C_IR); |
41 | if (err < 0) |
42 | return err; |
43 | |
44 | return 0; |
45 | } |
46 | |
47 | static int am79c_config_init(struct phy_device *phydev) |
48 | { |
49 | return 0; |
50 | } |
51 | |
52 | static int am79c_config_intr(struct phy_device *phydev) |
53 | { |
54 | int err; |
55 | |
56 | if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { |
57 | err = am79c_ack_interrupt(phydev); |
58 | if (err) |
59 | return err; |
60 | |
61 | err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT); |
62 | } else { |
63 | err = phy_write(phydev, MII_AM79C_IR, val: 0); |
64 | if (err) |
65 | return err; |
66 | |
67 | err = am79c_ack_interrupt(phydev); |
68 | } |
69 | |
70 | return err; |
71 | } |
72 | |
73 | static irqreturn_t am79c_handle_interrupt(struct phy_device *phydev) |
74 | { |
75 | int irq_status; |
76 | |
77 | irq_status = phy_read(phydev, MII_AM79C_IR); |
78 | if (irq_status < 0) { |
79 | phy_error(phydev); |
80 | return IRQ_NONE; |
81 | } |
82 | |
83 | if (!(irq_status & MII_AM79C_IR_IMASK_STAT)) |
84 | return IRQ_NONE; |
85 | |
86 | phy_trigger_machine(phydev); |
87 | |
88 | return IRQ_HANDLED; |
89 | } |
90 | |
91 | static struct phy_driver am79c_drivers[] = { |
92 | { |
93 | .phy_id = PHY_ID_AM79C874, |
94 | .name = "AM79C874" , |
95 | .phy_id_mask = 0xfffffff0, |
96 | /* PHY_BASIC_FEATURES */ |
97 | .config_init = am79c_config_init, |
98 | .config_intr = am79c_config_intr, |
99 | .handle_interrupt = am79c_handle_interrupt, |
100 | }, |
101 | { |
102 | .phy_id = PHY_ID_AC101L, |
103 | .name = "AC101L" , |
104 | .phy_id_mask = 0xfffffff0, |
105 | /* PHY_BASIC_FEATURES */ |
106 | .config_init = am79c_config_init, |
107 | .config_intr = am79c_config_intr, |
108 | .handle_interrupt = am79c_handle_interrupt, |
109 | }, |
110 | }; |
111 | |
112 | module_phy_driver(am79c_drivers); |
113 | |
114 | static struct mdio_device_id __maybe_unused amd_tbl[] = { |
115 | { PHY_ID_AC101L, 0xfffffff0 }, |
116 | { PHY_ID_AM79C874, 0xfffffff0 }, |
117 | { } |
118 | }; |
119 | |
120 | MODULE_DEVICE_TABLE(mdio, amd_tbl); |
121 | |