1 files changed, 62 insertions, 0 deletions
diff --git a/crates/net-phys/src/lib.rs b/crates/net-phys/src/lib.rs
new file mode 100644
index 0000000..c476799
--- /dev/null
+++ b/crates/net-phys/src/lib.rs
@@ -0,0 +1,62 @@
+#![no_std]
+#![feature(rustc_private)]
+extern crate fusible;
+
+pub mod ksz8081;
+
+pub trait Mdio {
+    type Error: core::error::Error;
+
+    fn read(&mut self, ctrl: u16) -> Result<u16, Self::Error>;
+
+    fn write(&mut self, ctrl: u16, data: u16) -> Result<(), Self::Error>;
+}
+
+pub trait Miim {
+    type Error: core::error::Error;
+
+    fn read(&mut self, phy: u8, reg: u8) -> Result<u16, Self::Error>;
+
+    fn write(&mut self, phy: u8, reg: u8, data: u16) -> Result<(), Self::Error>;
+}
+
+impl<T> Miim for T
+where
+    T: Mdio,
+{
+    type Error = <T as Mdio>::Error;
+
+    fn read(&mut self, phy: u8, reg: u8) -> Result<u16, Self::Error> {
+        Mdio::read(self, read_ctrl_bits(phy, reg))
+    }
+
+    fn write(&mut self, phy: u8, reg: u8, data: u16) -> Result<(), Self::Error> {
+        Mdio::write(self, write_ctrl_bits(phy, reg), data)
+    }
+}
+
+const fn phy_addr_ctrl_bits(phy_addr: u8) -> u16 {
+    const PHY_ADDR_OFFSET: u16 = 7;
+    ((phy_addr & 0b00011111) as u16) << PHY_ADDR_OFFSET
+}
+
+const fn reg_addr_ctrl_bits(reg_addr: u8) -> u16 {
+    const REG_ADDR_OFFSET: u16 = 2;
+    ((reg_addr & 0b00011111) as u16) << REG_ADDR_OFFSET
+}
+
+pub const fn read_ctrl_bits(phy_addr: u8, reg_addr: u8) -> u16 {
+    const READ_CTRL_BITS: u16 = 0b0110_00000_00000_00;
+    READ_CTRL_BITS | phy_addr_ctrl_bits(phy_addr) | reg_addr_ctrl_bits(reg_addr)
+}
+
+pub const fn write_ctrl_bits(phy_addr: u8, reg_addr: u8) -> u16 {
+    const WRITE_CTRL_BITS: u16 = 0b0101_00000_00000_10;
+    WRITE_CTRL_BITS | phy_addr_ctrl_bits(phy_addr) | reg_addr_ctrl_bits(reg_addr)
+}
+
+pub trait Phy<M: Miim> {
+    type Error: core::error::Error;
+
+    fn initialize(&mut self, miim: &mut M) -> Result<(), Self::Error>;
+}