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[54.68.170.188]) by smtp.gmail.com with ESMTPSA id j7-20020aa78007000000b006900cb919b8sm347734pfi.53.2023.11.22.21.09.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Nov 2023 21:09:55 -0800 (PST) From: FUJITA Tomonori To: netdev@vger.kernel.org Cc: rust-for-linux@vger.kernel.org, andrew@lunn.ch, tmgross@umich.edu, miguel.ojeda.sandonis@gmail.com, benno.lossin@proton.me, wedsonaf@gmail.com, aliceryhl@google.com, boqun.feng@gmail.com Subject: [PATCH net-next v8 4/4] net: phy: add Rust Asix PHY driver Date: Thu, 23 Nov 2023 14:04:12 +0900 Message-Id: <20231123050412.1012252-5-fujita.tomonori@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231123050412.1012252-1-fujita.tomonori@gmail.com> References: <20231123050412.1012252-1-fujita.tomonori@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org This is the Rust implementation of drivers/net/phy/ax88796b.c. The features are equivalent. You can choose C or Rust version kernel configuration. Signed-off-by: FUJITA Tomonori Reviewed-by: Trevor Gross Reviewed-by: Benno Lossin --- MAINTAINERS | 8 ++ drivers/net/phy/Kconfig | 8 ++ drivers/net/phy/Makefile | 6 +- drivers/net/phy/ax88796b_rust.rs | 135 +++++++++++++++++++++++++++++++ rust/uapi/uapi_helper.h | 2 + 5 files changed, 158 insertions(+), 1 deletion(-) create mode 100644 drivers/net/phy/ax88796b_rust.rs diff --git a/MAINTAINERS b/MAINTAINERS index 49ba506fbc3c..2cf606342a1b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3084,6 +3084,14 @@ S: Maintained F: Documentation/devicetree/bindings/net/asix,ax88796c.yaml F: drivers/net/ethernet/asix/ax88796c_* +ASIX PHY DRIVER [RUST] +M: FUJITA Tomonori +R: Trevor Gross +L: netdev@vger.kernel.org +L: rust-for-linux@vger.kernel.org +S: Maintained +F: drivers/net/phy/ax88796b_rust.rs + ASPEED CRYPTO DRIVER M: Neal Liu L: linux-aspeed@lists.ozlabs.org (moderated for non-subscribers) diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index 8d00cece5e23..0f483c3dfed9 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -112,6 +112,14 @@ config AX88796B_PHY Currently supports the Asix Electronics PHY found in the X-Surf 100 AX88796B package. +config AX88796B_RUST_PHY + bool "Rust reference driver for Asix PHYs" + depends on RUST_PHYLIB_ABSTRACTIONS && AX88796B_PHY + help + Uses the Rust reference driver for Asix PHYs (ax88796b_rust.ko). + The features are equivalent. It supports the Asix Electronics PHY + found in the X-Surf 100 AX88796B package. + config BROADCOM_PHY tristate "Broadcom 54XX PHYs" select BCM_NET_PHYLIB diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile index f65e85c91fc1..ab450a46b855 100644 --- a/drivers/net/phy/Makefile +++ b/drivers/net/phy/Makefile @@ -37,7 +37,11 @@ obj-$(CONFIG_ADIN1100_PHY) += adin1100.o obj-$(CONFIG_AMD_PHY) += amd.o obj-$(CONFIG_AQUANTIA_PHY) += aquantia/ obj-$(CONFIG_AT803X_PHY) += at803x.o -obj-$(CONFIG_AX88796B_PHY) += ax88796b.o +ifdef CONFIG_AX88796B_RUST_PHY + obj-$(CONFIG_AX88796B_PHY) += ax88796b_rust.o +else + obj-$(CONFIG_AX88796B_PHY) += ax88796b.o +endif obj-$(CONFIG_BCM54140_PHY) += bcm54140.o obj-$(CONFIG_BCM63XX_PHY) += bcm63xx.o obj-$(CONFIG_BCM7XXX_PHY) += bcm7xxx.o diff --git a/drivers/net/phy/ax88796b_rust.rs b/drivers/net/phy/ax88796b_rust.rs new file mode 100644 index 000000000000..5c92572962dc --- /dev/null +++ b/drivers/net/phy/ax88796b_rust.rs @@ -0,0 +1,135 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2023 FUJITA Tomonori + +//! 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::(), + DeviceId::new_with_driver::(), + DeviceId::new_with_driver::() + ], + name: "rust_asix_phy", + author: "FUJITA Tomonori ", + 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 { + 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) + } +} diff --git a/rust/uapi/uapi_helper.h b/rust/uapi/uapi_helper.h index 301f5207f023..08f5e9334c9e 100644 --- a/rust/uapi/uapi_helper.h +++ b/rust/uapi/uapi_helper.h @@ -7,3 +7,5 @@ */ #include +#include +#include