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use core::{
fmt,
sync::atomic::{AtomicPtr, Ordering},
};
use crate::LineStsFlags;
pub struct MmioSerialPort {
data: AtomicPtr<u8>,
int_en: AtomicPtr<u8>,
fifo_ctrl: AtomicPtr<u8>,
line_ctrl: AtomicPtr<u8>,
modem_ctrl: AtomicPtr<u8>,
line_sts: AtomicPtr<u8>,
}
impl MmioSerialPort {
#[cfg(feature = "nightly")]
pub const unsafe fn new(base: usize) -> Self {
let base_pointer = base as *mut u8;
Self {
data: AtomicPtr::new(base_pointer),
int_en: AtomicPtr::new(base_pointer.add(1)),
fifo_ctrl: AtomicPtr::new(base_pointer.add(2)),
line_ctrl: AtomicPtr::new(base_pointer.add(3)),
modem_ctrl: AtomicPtr::new(base_pointer.add(4)),
line_sts: AtomicPtr::new(base_pointer.add(5)),
}
}
#[cfg(feature = "stable")]
pub unsafe fn new(base: usize) -> Self {
let base_pointer = base as *mut u8;
Self {
data: AtomicPtr::new(base_pointer),
int_en: AtomicPtr::new(base_pointer.add(1)),
fifo_ctrl: AtomicPtr::new(base_pointer.add(2)),
line_ctrl: AtomicPtr::new(base_pointer.add(3)),
modem_ctrl: AtomicPtr::new(base_pointer.add(4)),
line_sts: AtomicPtr::new(base_pointer.add(5)),
}
}
pub fn init(&mut self) {
let self_int_en = self.int_en.load(Ordering::Relaxed);
let self_line_ctrl = self.line_ctrl.load(Ordering::Relaxed);
let self_data = self.data.load(Ordering::Relaxed);
let self_fifo_ctrl = self.fifo_ctrl.load(Ordering::Relaxed);
let self_modem_ctrl = self.modem_ctrl.load(Ordering::Relaxed);
unsafe {
self_int_en.write(0x00);
self_line_ctrl.write(0x80);
self_data.write(0x03);
self_int_en.write(0x00);
self_line_ctrl.write(0x03);
self_fifo_ctrl.write(0xC7);
self_modem_ctrl.write(0x0B);
self_int_en.write(0x01);
}
}
fn line_sts(&mut self) -> LineStsFlags {
unsafe { LineStsFlags::from_bits_truncate(*self.line_sts.load(Ordering::Relaxed)) }
}
pub fn send(&mut self, data: u8) {
let self_data = self.data.load(Ordering::Relaxed);
unsafe {
match data {
8 | 0x7F => {
wait_for!(self.line_sts().contains(LineStsFlags::OUTPUT_EMPTY));
self_data.write(8);
wait_for!(self.line_sts().contains(LineStsFlags::OUTPUT_EMPTY));
self_data.write(b' ');
wait_for!(self.line_sts().contains(LineStsFlags::OUTPUT_EMPTY));
self_data.write(8)
}
_ => {
wait_for!(self.line_sts().contains(LineStsFlags::OUTPUT_EMPTY));
self_data.write(data);
}
}
}
}
pub fn receive(&mut self) -> u8 {
let self_data = self.data.load(Ordering::Relaxed);
unsafe {
wait_for!(self.line_sts().contains(LineStsFlags::INPUT_FULL));
self_data.read()
}
}
}
impl fmt::Write for MmioSerialPort {
fn write_str(&mut self, s: &str) -> fmt::Result {
for byte in s.bytes() {
self.send(byte);
}
Ok(())
}
}