tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2023 FUJITA Tomonori <fujita.tomonori@gmail.com>
3
4//! Rust Asix PHYs driver
5//!
6//! C version of this driver: [`drivers/net/phy/ax88796b.c`](./ax88796b.c)
7use kernel::{
8 c_str,
9 net::phy::{self, reg::C22, DeviceId, Driver},
10 prelude::*,
11 uapi,
12};
13
14kernel::module_phy_driver! {
15 drivers: [PhyAX88772A, PhyAX88772C, PhyAX88796B],
16 device_table: [
17 DeviceId::new_with_driver::<PhyAX88772A>(),
18 DeviceId::new_with_driver::<PhyAX88772C>(),
19 DeviceId::new_with_driver::<PhyAX88796B>()
20 ],
21 name: "rust_asix_phy",
22 author: "FUJITA Tomonori <fujita.tomonori@gmail.com>",
23 description: "Rust Asix PHYs driver",
24 license: "GPL",
25}
26
27const BMCR_SPEED100: u16 = uapi::BMCR_SPEED100 as u16;
28const BMCR_FULLDPLX: u16 = uapi::BMCR_FULLDPLX as u16;
29
30// Performs a software PHY reset using the standard
31// BMCR_RESET bit and poll for the reset bit to be cleared.
32// Toggle BMCR_RESET bit off to accommodate broken AX8796B PHY implementation
33// such as used on the Individual Computers' X-Surf 100 Zorro card.
34fn asix_soft_reset(dev: &mut phy::Device) -> Result {
35 dev.write(C22::BMCR, 0)?;
36 dev.genphy_soft_reset()
37}
38
39struct PhyAX88772A;
40
41#[vtable]
42impl Driver for PhyAX88772A {
43 const FLAGS: u32 = phy::flags::IS_INTERNAL;
44 const NAME: &'static CStr = c_str!("Asix Electronics AX88772A");
45 const PHY_DEVICE_ID: DeviceId = DeviceId::new_with_exact_mask(0x003b1861);
46
47 // AX88772A is not working properly with some old switches (NETGEAR EN 108TP):
48 // after autoneg is done and the link status is reported as active, the MII_LPA
49 // register is 0. This issue is not reproducible on AX88772C.
50 fn read_status(dev: &mut phy::Device) -> Result<u16> {
51 dev.genphy_update_link()?;
52 if !dev.is_link_up() {
53 return Ok(0);
54 }
55 // If MII_LPA is 0, phy_resolve_aneg_linkmode() will fail to resolve
56 // linkmode so use MII_BMCR as default values.
57 let ret = dev.read(C22::BMCR)?;
58
59 if ret & BMCR_SPEED100 != 0 {
60 dev.set_speed(uapi::SPEED_100);
61 } else {
62 dev.set_speed(uapi::SPEED_10);
63 }
64
65 let duplex = if ret & BMCR_FULLDPLX != 0 {
66 phy::DuplexMode::Full
67 } else {
68 phy::DuplexMode::Half
69 };
70 dev.set_duplex(duplex);
71
72 dev.genphy_read_lpa()?;
73
74 if dev.is_autoneg_enabled() && dev.is_autoneg_completed() {
75 dev.resolve_aneg_linkmode();
76 }
77
78 Ok(0)
79 }
80
81 fn suspend(dev: &mut phy::Device) -> Result {
82 dev.genphy_suspend()
83 }
84
85 fn resume(dev: &mut phy::Device) -> Result {
86 dev.genphy_resume()
87 }
88
89 fn soft_reset(dev: &mut phy::Device) -> Result {
90 asix_soft_reset(dev)
91 }
92
93 fn link_change_notify(dev: &mut phy::Device) {
94 // Reset PHY, otherwise MII_LPA will provide outdated information.
95 // This issue is reproducible only with some link partner PHYs.
96 if dev.state() == phy::DeviceState::NoLink {
97 let _ = dev.init_hw();
98 let _ = dev.start_aneg();
99 }
100 }
101}
102
103struct PhyAX88772C;
104
105#[vtable]
106impl Driver for PhyAX88772C {
107 const FLAGS: u32 = phy::flags::IS_INTERNAL;
108 const NAME: &'static CStr = c_str!("Asix Electronics AX88772C");
109 const PHY_DEVICE_ID: DeviceId = DeviceId::new_with_exact_mask(0x003b1881);
110
111 fn suspend(dev: &mut phy::Device) -> Result {
112 dev.genphy_suspend()
113 }
114
115 fn resume(dev: &mut phy::Device) -> Result {
116 dev.genphy_resume()
117 }
118
119 fn soft_reset(dev: &mut phy::Device) -> Result {
120 asix_soft_reset(dev)
121 }
122}
123
124struct PhyAX88796B;
125
126#[vtable]
127impl Driver for PhyAX88796B {
128 const NAME: &'static CStr = c_str!("Asix Electronics AX88796B");
129 const PHY_DEVICE_ID: DeviceId = DeviceId::new_with_model_mask(0x003b1841);
130
131 fn soft_reset(dev: &mut phy::Device) -> Result {
132 asix_soft_reset(dev)
133 }
134}