2021-10-06 13:02:28 +08:00
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use crc;
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use core_io::{ErrorKind as IoErrorKind, Error as IoError};
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use io::{proto::ProtoRead, proto::ProtoWrite, Cursor};
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use libboard_zynq::{timer::GlobalTimer, time::Milliseconds};
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use crate::mem::mem::DRTIOAUX_MEM;
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use crate::pl::csr::DRTIOAUX;
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use crate::drtioaux_proto::Error as ProtocolError;
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pub use crate::drtioaux_proto::Packet;
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#[derive(Debug)]
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pub enum Error {
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GatewareError,
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CorruptedPacket,
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LinkDown,
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TimedOut,
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UnexpectedReply,
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RoutingError,
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Protocol(ProtocolError)
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}
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impl From<ProtocolError> for Error {
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fn from(value: ProtocolError) -> Error {
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Error::Protocol(value)
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}
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}
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impl From<IoError> for Error {
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fn from(value: IoError) -> Error {
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Error::Protocol(ProtocolError::Io(value))
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}
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}
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pub fn reset(linkno: u8) {
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let linkno = linkno as usize;
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unsafe {
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// clear buffer first to limit race window with buffer overflow
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// error. We assume the CPU is fast enough so that no two packets
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// will be received between the buffer and the error flag are cleared.
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(DRTIOAUX[linkno].aux_rx_present_write)(1);
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(DRTIOAUX[linkno].aux_rx_error_write)(1);
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}
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}
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pub fn has_rx_error(linkno: u8) -> bool {
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let linkno = linkno as usize;
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unsafe {
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let error = (DRTIOAUX[linkno].aux_rx_error_read)() != 0;
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if error {
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(DRTIOAUX[linkno].aux_rx_error_write)(1)
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}
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error
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}
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}
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2021-11-29 12:27:27 +08:00
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pub fn copy_work_buffer(src: *mut u16, dst: *mut u16, len: isize) {
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2021-11-24 12:12:40 +08:00
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// AXI writes must be 4-byte aligned (drtio proto doesn't care for that),
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2021-11-29 12:27:27 +08:00
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// and AXI burst reads/writes are not implemented yet in gateware
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2021-11-24 12:12:40 +08:00
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// thus the need for a work buffer for transmitting and copying it over
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2021-10-06 13:02:28 +08:00
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unsafe {
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2021-11-29 12:27:27 +08:00
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for i in (0..(len/2)).step_by(2) {
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2021-11-24 12:12:40 +08:00
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*dst.offset(i) = *src.offset(i);
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2021-11-29 12:27:27 +08:00
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*dst.offset(i+1) = *src.offset(i+1);
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2021-10-06 13:02:28 +08:00
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}
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}
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}
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fn receive<F, T>(linkno: u8, f: F) -> Result<Option<T>, Error>
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where F: FnOnce(&[u8]) -> Result<T, Error>
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{
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let linkidx = linkno as usize;
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unsafe {
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if (DRTIOAUX[linkidx].aux_rx_present_read)() == 1 {
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2021-11-29 12:27:27 +08:00
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let ptr = (DRTIOAUX_MEM[linkidx].base + DRTIOAUX_MEM[linkidx].size / 2) as *mut u16;
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2021-10-06 13:02:28 +08:00
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let len = (DRTIOAUX[linkidx].aux_rx_length_read)() as usize;
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2021-11-29 12:27:27 +08:00
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// work buffer to accomodate axi burst reads
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let mut buf: [u8; 1024] = [0; 1024];
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copy_work_buffer(ptr, buf.as_mut_ptr() as *mut u16, len as isize);
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let result = f(&buf[0..len]);
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2021-10-06 13:02:28 +08:00
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(DRTIOAUX[linkidx].aux_rx_present_write)(1);
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Ok(Some(result?))
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} else {
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Ok(None)
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}
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}
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}
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pub fn recv(linkno: u8) -> Result<Option<Packet>, Error> {
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if has_rx_error(linkno) {
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return Err(Error::GatewareError)
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}
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receive(linkno, |buffer| {
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if buffer.len() < 8 {
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return Err(IoError::new(IoErrorKind::UnexpectedEof, "Unexpected end").into())
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}
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let mut reader = Cursor::new(buffer);
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let checksum_at = buffer.len() - 4;
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let checksum = crc::crc32::checksum_ieee(&reader.get_ref()[0..checksum_at]);
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reader.set_position(checksum_at);
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if reader.read_u32()? != checksum {
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return Err(Error::CorruptedPacket)
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}
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reader.set_position(0);
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Ok(Packet::read_from(&mut reader)?)
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})
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}
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pub fn recv_timeout(linkno: u8, timeout_ms: Option<u64>,
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timer: GlobalTimer) -> Result<Packet, Error>
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{
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let timeout_ms = Milliseconds(timeout_ms.unwrap_or(10));
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let limit = timer.get_time() + timeout_ms;
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while timer.get_time() < limit {
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match recv(linkno)? {
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None => (),
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Some(packet) => return Ok(packet),
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}
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}
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Err(Error::TimedOut)
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}
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fn transmit<F>(linkno: u8, f: F) -> Result<(), Error>
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where F: FnOnce(&mut [u8]) -> Result<usize, Error>
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{
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let linkno = linkno as usize;
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unsafe {
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while (DRTIOAUX[linkno].aux_tx_read)() != 0 {}
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2021-11-29 12:27:27 +08:00
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let ptr = DRTIOAUX_MEM[linkno].base as *mut u16;
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2021-10-06 13:02:28 +08:00
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let len = DRTIOAUX_MEM[linkno].size / 2;
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// work buffer, works with unaligned mem access
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let mut buf: [u8; 1024] = [0; 1024];
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let len = f(&mut buf[0..len])?;
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2021-11-29 12:27:27 +08:00
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copy_work_buffer(buf.as_mut_ptr() as *mut u16, ptr, len as isize);
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2021-10-06 13:02:28 +08:00
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(DRTIOAUX[linkno].aux_tx_length_write)(len as u16);
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(DRTIOAUX[linkno].aux_tx_write)(1);
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Ok(())
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}
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}
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pub fn send(linkno: u8, packet: &Packet) -> Result<(), Error> {
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transmit(linkno, |buffer| {
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let mut writer = Cursor::new(buffer);
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packet.write_to(&mut writer)?;
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let padding = 4 - (writer.position() % 4);
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if padding != 4 {
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for _ in 0..padding {
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writer.write_u8(0)?;
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}
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}
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let checksum = crc::crc32::checksum_ieee(&writer.get_ref()[0..writer.position()]);
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writer.write_u32(checksum)?;
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Ok(writer.position())
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})
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}
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