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Only access the necessary parts of State

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This commit is contained in:
Dániel Buga 2024-04-27 17:55:57 +02:00
parent 7b4d2ab1be
commit 61e3ca049c
1 changed files with 33 additions and 27 deletions
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60
embassy-usb-synopsys-otg/src/lib.rs
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@ -55,12 +55,12 @@ pub unsafe fn on_interrupt(r: Otg, state: &State<{ MAX_EP_COUNT }>, ep_count: us
while r.grstctl().read().txfflsh() {}
}
if state.ep0_setup_ready.load(Ordering::Relaxed) == false {
if state.cp_state.setup_ready.load(Ordering::Relaxed) == false {
// SAFETY: exclusive access ensured by atomic bool
let data = unsafe { &mut *state.ep0_setup_data.get() };
let data = unsafe { &mut *state.cp_state.setup_data.get() };
data[0..4].copy_from_slice(&r.fifo(0).read().0.to_ne_bytes());
data[4..8].copy_from_slice(&r.fifo(0).read().0.to_ne_bytes());
state.ep0_setup_ready.store(true, Ordering::Release);
state.cp_state.setup_ready.store(true, Ordering::Release);
state.ep_states[0].out_waker.wake();
} else {
error!("received SETUP before previous finished processing");
@ -216,11 +216,15 @@ struct EpState {
out_size: AtomicU16,
}
struct ControlPipeSetupState {
/// Holds received SETUP packets. Available if [Ep0State::setup_ready] is true.
setup_data: UnsafeCell<[u8; 8]>,
setup_ready: AtomicBool,
}
/// USB OTG driver state.
pub struct State<const EP_COUNT: usize> {
/// Holds received SETUP packets. Available if [State::ep0_setup_ready] is true.
ep0_setup_data: UnsafeCell<[u8; 8]>,
ep0_setup_ready: AtomicBool,
cp_state: ControlPipeSetupState,
ep_states: [EpState; EP_COUNT],
bus_waker: AtomicWaker,
}
@ -242,8 +246,10 @@ impl<const EP_COUNT: usize> State<EP_COUNT> {
};
Self {
ep0_setup_data: UnsafeCell::new([0u8; 8]),
ep0_setup_ready: AtomicBool::new(false),
cp_state: ControlPipeSetupState {
setup_data: UnsafeCell::new([0u8; 8]),
setup_ready: AtomicBool::new(false),
},
ep_states: [NEW_EP_STATE; EP_COUNT],
bus_waker: NEW_AW,
}
@ -385,11 +391,11 @@ impl<'d> Driver<'d> {
trace!(" index={}", index);
let state = &self.instance.state.ep_states[index];
if D::dir() == Direction::Out {
// Buffer capacity check was done above, now allocation cannot fail
unsafe {
*self.instance.state.ep_states[index].out_buffer.get() =
self.ep_out_buffer.as_mut_ptr().offset(self.ep_out_buffer_offset as _);
*state.out_buffer.get() = self.ep_out_buffer.as_mut_ptr().offset(self.ep_out_buffer_offset as _);
}
self.ep_out_buffer_offset += max_packet_size as usize;
}
@ -397,7 +403,7 @@ impl<'d> Driver<'d> {
Ok(Endpoint {
_phantom: PhantomData,
regs: self.instance.regs,
state: self.instance.state,
state,
info: EndpointInfo {
addr: EndpointAddress::from_parts(index, D::dir()),
ep_type,
@ -446,6 +452,7 @@ impl<'d> embassy_usb_driver::Driver<'d> for Driver<'d> {
let regs = self.instance.regs;
let quirk_setup_late_cnak = self.instance.quirk_setup_late_cnak;
let cp_setup_state = &self.instance.state.cp_state;
(
Bus {
config: self.config,
@ -456,6 +463,7 @@ impl<'d> embassy_usb_driver::Driver<'d> for Driver<'d> {
},
ControlPipe {
max_packet_size: control_max_packet_size,
setup_state: cp_setup_state,
ep_out,
ep_in,
regs,
@ -955,7 +963,7 @@ pub struct Endpoint<'d, D> {
_phantom: PhantomData<D>,
regs: Otg,
info: EndpointInfo,
state: &'d State<{ MAX_EP_COUNT }>,
state: &'d EpState,
}
impl<'d> embassy_usb_driver::Endpoint for Endpoint<'d, In> {
@ -967,7 +975,7 @@ impl<'d> embassy_usb_driver::Endpoint for Endpoint<'d, In> {
poll_fn(|cx| {
let ep_index = self.info.addr.index();
self.state.ep_states[ep_index].in_waker.register(cx.waker());
self.state.in_waker.register(cx.waker());
if self.regs.diepctl(ep_index).read().usbaep() {
Poll::Ready(())
@ -988,7 +996,7 @@ impl<'d> embassy_usb_driver::Endpoint for Endpoint<'d, Out> {
poll_fn(|cx| {
let ep_index = self.info.addr.index();
self.state.ep_states[ep_index].out_waker.register(cx.waker());
self.state.out_waker.register(cx.waker());
if self.regs.doepctl(ep_index).read().usbaep() {
Poll::Ready(())
@ -1006,7 +1014,7 @@ impl<'d> embassy_usb_driver::EndpointOut for Endpoint<'d, Out> {
poll_fn(|cx| {
let index = self.info.addr.index();
self.state.ep_states[index].out_waker.register(cx.waker());
self.state.out_waker.register(cx.waker());
let doepctl = self.regs.doepctl(index).read();
trace!("read ep={:?}: doepctl {:08x}", self.info.addr, doepctl.0,);
@ -1015,7 +1023,7 @@ impl<'d> embassy_usb_driver::EndpointOut for Endpoint<'d, Out> {
return Poll::Ready(Err(EndpointError::Disabled));
}
let len = self.state.ep_states[index].out_size.load(Ordering::Relaxed);
let len = self.state.out_size.load(Ordering::Relaxed);
if len != EP_OUT_BUFFER_EMPTY {
trace!("read ep={:?} done len={}", self.info.addr, len);
@ -1024,14 +1032,11 @@ impl<'d> embassy_usb_driver::EndpointOut for Endpoint<'d, Out> {
}
// SAFETY: exclusive access ensured by `ep_out_size` atomic variable
let data =
unsafe { core::slice::from_raw_parts(*self.state.ep_states[index].out_buffer.get(), len as usize) };
let data = unsafe { core::slice::from_raw_parts(*self.state.out_buffer.get(), len as usize) };
buf[..len as usize].copy_from_slice(data);
// Release buffer
self.state.ep_states[index]
.out_size
.store(EP_OUT_BUFFER_EMPTY, Ordering::Release);
self.state.out_size.store(EP_OUT_BUFFER_EMPTY, Ordering::Release);
critical_section::with(|_| {
// Receive 1 packet
@ -1066,7 +1071,7 @@ impl<'d> embassy_usb_driver::EndpointIn for Endpoint<'d, In> {
let index = self.info.addr.index();
// Wait for previous transfer to complete and check if endpoint is disabled
poll_fn(|cx| {
self.state.ep_states[index].in_waker.register(cx.waker());
self.state.in_waker.register(cx.waker());
let diepctl = self.regs.diepctl(index).read();
let dtxfsts = self.regs.dtxfsts(index).read();
@ -1091,7 +1096,7 @@ impl<'d> embassy_usb_driver::EndpointIn for Endpoint<'d, In> {
if buf.len() > 0 {
poll_fn(|cx| {
self.state.ep_states[index].in_waker.register(cx.waker());
self.state.in_waker.register(cx.waker());
let size_words = (buf.len() + 3) / 4;
@ -1151,6 +1156,7 @@ impl<'d> embassy_usb_driver::EndpointIn for Endpoint<'d, In> {
pub struct ControlPipe<'d> {
max_packet_size: u16,
regs: Otg,
setup_state: &'d ControlPipeSetupState,
ep_in: Endpoint<'d, In>,
ep_out: Endpoint<'d, Out>,
quirk_setup_late_cnak: bool,
@ -1163,11 +1169,11 @@ impl<'d> embassy_usb_driver::ControlPipe for ControlPipe<'d> {
async fn setup(&mut self) -> [u8; 8] {
poll_fn(|cx| {
self.ep_out.state.ep_states[0].out_waker.register(cx.waker());
self.ep_out.state.out_waker.register(cx.waker());
if self.ep_out.state.ep0_setup_ready.load(Ordering::Relaxed) {
let data = unsafe { *self.ep_out.state.ep0_setup_data.get() };
self.ep_out.state.ep0_setup_ready.store(false, Ordering::Release);
if self.setup_state.setup_ready.load(Ordering::Relaxed) {
let data = unsafe { *self.setup_state.setup_data.get() };
self.setup_state.setup_ready.store(false, Ordering::Release);
// EP0 should not be controlled by `Bus` so this RMW does not need a critical section
// Receive 1 SETUP packet