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-rw-r--r--drivers/net/phy/ax88796b_rust.rs135
1 files changed, 135 insertions, 0 deletions
diff --git a/drivers/net/phy/ax88796b_rust.rs b/drivers/net/phy/ax88796b_rust.rs
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+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2023 FUJITA Tomonori <fujita.tomonori@gmail.com>
+
+//! Rust Asix PHYs driver
+//!
+//! C version of this driver: [`drivers/net/phy/ax88796b.c`](./ax88796b.c)
+use kernel::{
+ c_str,
+ net::phy::{self, DeviceId, Driver},
+ prelude::*,
+ uapi,
+};
+
+kernel::module_phy_driver! {
+ drivers: [PhyAX88772A, PhyAX88772C, PhyAX88796B],
+ device_table: [
+ DeviceId::new_with_driver::<PhyAX88772A>(),
+ DeviceId::new_with_driver::<PhyAX88772C>(),
+ DeviceId::new_with_driver::<PhyAX88796B>()
+ ],
+ name: "rust_asix_phy",
+ author: "FUJITA Tomonori <fujita.tomonori@gmail.com>",
+ description: "Rust Asix PHYs driver",
+ license: "GPL",
+}
+
+const MII_BMCR: u16 = uapi::MII_BMCR as u16;
+const BMCR_SPEED100: u16 = uapi::BMCR_SPEED100 as u16;
+const BMCR_FULLDPLX: u16 = uapi::BMCR_FULLDPLX as u16;
+
+// Performs a software PHY reset using the standard
+// BMCR_RESET bit and poll for the reset bit to be cleared.
+// Toggle BMCR_RESET bit off to accommodate broken AX8796B PHY implementation
+// such as used on the Individual Computers' X-Surf 100 Zorro card.
+fn asix_soft_reset(dev: &mut phy::Device) -> Result {
+ dev.write(uapi::MII_BMCR as u16, 0)?;
+ dev.genphy_soft_reset()
+}
+
+struct PhyAX88772A;
+
+#[vtable]
+impl Driver for PhyAX88772A {
+ const FLAGS: u32 = phy::flags::IS_INTERNAL;
+ const NAME: &'static CStr = c_str!("Asix Electronics AX88772A");
+ const PHY_DEVICE_ID: DeviceId = DeviceId::new_with_exact_mask(0x003b1861);
+
+ // AX88772A is not working properly with some old switches (NETGEAR EN 108TP):
+ // after autoneg is done and the link status is reported as active, the MII_LPA
+ // register is 0. This issue is not reproducible on AX88772C.
+ fn read_status(dev: &mut phy::Device) -> Result<u16> {
+ dev.genphy_update_link()?;
+ if !dev.is_link_up() {
+ return Ok(0);
+ }
+ // If MII_LPA is 0, phy_resolve_aneg_linkmode() will fail to resolve
+ // linkmode so use MII_BMCR as default values.
+ let ret = dev.read(MII_BMCR)?;
+
+ if ret & BMCR_SPEED100 != 0 {
+ dev.set_speed(uapi::SPEED_100);
+ } else {
+ dev.set_speed(uapi::SPEED_10);
+ }
+
+ let duplex = if ret & BMCR_FULLDPLX != 0 {
+ phy::DuplexMode::Full
+ } else {
+ phy::DuplexMode::Half
+ };
+ dev.set_duplex(duplex);
+
+ dev.genphy_read_lpa()?;
+
+ if dev.is_autoneg_enabled() && dev.is_autoneg_completed() {
+ dev.resolve_aneg_linkmode();
+ }
+
+ Ok(0)
+ }
+
+ fn suspend(dev: &mut phy::Device) -> Result {
+ dev.genphy_suspend()
+ }
+
+ fn resume(dev: &mut phy::Device) -> Result {
+ dev.genphy_resume()
+ }
+
+ fn soft_reset(dev: &mut phy::Device) -> Result {
+ asix_soft_reset(dev)
+ }
+
+ fn link_change_notify(dev: &mut phy::Device) {
+ // Reset PHY, otherwise MII_LPA will provide outdated information.
+ // This issue is reproducible only with some link partner PHYs.
+ if dev.state() == phy::DeviceState::NoLink {
+ let _ = dev.init_hw();
+ let _ = dev.start_aneg();
+ }
+ }
+}
+
+struct PhyAX88772C;
+
+#[vtable]
+impl Driver for PhyAX88772C {
+ const FLAGS: u32 = phy::flags::IS_INTERNAL;
+ const NAME: &'static CStr = c_str!("Asix Electronics AX88772C");
+ const PHY_DEVICE_ID: DeviceId = DeviceId::new_with_exact_mask(0x003b1881);
+
+ fn suspend(dev: &mut phy::Device) -> Result {
+ dev.genphy_suspend()
+ }
+
+ fn resume(dev: &mut phy::Device) -> Result {
+ dev.genphy_resume()
+ }
+
+ fn soft_reset(dev: &mut phy::Device) -> Result {
+ asix_soft_reset(dev)
+ }
+}
+
+struct PhyAX88796B;
+
+#[vtable]
+impl Driver for PhyAX88796B {
+ const NAME: &'static CStr = c_str!("Asix Electronics AX88796B");
+ const PHY_DEVICE_ID: DeviceId = DeviceId::new_with_model_mask(0x003b1841);
+
+ fn soft_reset(dev: &mut phy::Device) -> Result {
+ asix_soft_reset(dev)
+ }
+}