mirror of https://github.com/m-labs/artiq
78 lines
2.3 KiB
Rust
78 lines
2.3 KiB
Rust
use core::slice;
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use board::{csr, mem};
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use smoltcp::Error;
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use smoltcp::phy::Device;
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const RX0_BASE: usize = mem::ETHMAC_BASE + 0x0000;
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const RX1_BASE: usize = mem::ETHMAC_BASE + 0x0800;
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const TX0_BASE: usize = mem::ETHMAC_BASE + 0x1000;
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const TX1_BASE: usize = mem::ETHMAC_BASE + 0x1800;
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const RX_BUFFERS: [*mut u8; 2] = [RX0_BASE as *mut u8, RX1_BASE as *mut u8];
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const TX_BUFFERS: [*mut u8; 2] = [TX0_BASE as *mut u8, TX1_BASE as *mut u8];
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pub struct EthernetDevice;
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impl Device for EthernetDevice {
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type RxBuffer = RxBuffer;
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type TxBuffer = TxBuffer;
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fn mtu(&self) -> usize { 1500 }
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fn receive(&mut self) -> Result<Self::RxBuffer, Error> {
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unsafe {
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if csr::ethmac::sram_writer_ev_pending_read() != 0 {
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let slot = csr::ethmac::sram_writer_slot_read();
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let length = csr::ethmac::sram_writer_length_read();
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Ok(RxBuffer(slice::from_raw_parts(RX_BUFFERS[slot as usize],
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length as usize)))
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} else {
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Err(Error::Exhausted)
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}
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}
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}
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fn transmit(&mut self, length: usize) -> Result<Self::TxBuffer, Error> {
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unsafe {
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if csr::ethmac::sram_reader_ready_read() != 0 {
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let slot = csr::ethmac::sram_reader_slot_read();
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let slot = (slot + 1) % (TX_BUFFERS.len() as u8);
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csr::ethmac::sram_reader_slot_write(slot);
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csr::ethmac::sram_reader_length_write(length as u16);
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Ok(TxBuffer(slice::from_raw_parts_mut(TX_BUFFERS[slot as usize],
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length as usize)))
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} else {
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Err(Error::Exhausted)
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}
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}
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}
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}
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pub struct RxBuffer(&'static [u8]);
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impl AsRef<[u8]> for RxBuffer {
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fn as_ref(&self) -> &[u8] { self.0 }
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}
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impl Drop for RxBuffer {
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fn drop(&mut self) {
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unsafe { csr::ethmac::sram_writer_ev_pending_write(1) }
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}
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}
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pub struct TxBuffer(&'static mut [u8]);
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impl AsRef<[u8]> for TxBuffer {
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fn as_ref(&self) -> &[u8] { self.0 }
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}
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impl AsMut<[u8]> for TxBuffer {
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fn as_mut(&mut self) -> &mut [u8] { self.0 }
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}
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impl Drop for TxBuffer {
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fn drop(&mut self) {
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unsafe { csr::ethmac::sram_reader_start_write(1) }
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}
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}
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