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zynq-rs/libboard_zynq/src/gic.rs

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//! ARM Generic Interrupt Controller
use bit_field::BitField;
use libregister::{RegisterW, RegisterRW, RegisterR};
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use super::mpcore;
#[derive(Debug, Clone, Copy)]
pub struct InterruptId(pub u8);
#[derive(Debug, Clone, Copy)]
#[repr(u8)]
pub enum CPUCore {
Core0 = 0b01,
Core1 = 0b10
}
#[derive(Debug, Clone, Copy)]
pub struct TargetCPU(u8);
impl TargetCPU {
pub const fn none() -> TargetCPU {
TargetCPU(0)
}
pub const fn and(self, other: TargetCPU) -> TargetCPU {
TargetCPU(self.0 | other.0)
}
}
impl From<CPUCore> for TargetCPU {
fn from(core: CPUCore) -> Self {
TargetCPU(core as u8)
}
}
pub enum TargetList {
CPUList(TargetCPU),
Others,
This
}
impl From<CPUCore> for TargetList {
fn from(core: CPUCore) -> Self {
TargetList::CPUList(TargetCPU(core as u8))
}
}
impl From<TargetCPU> for TargetList {
fn from(cpu: TargetCPU) -> Self {
TargetList::CPUList(cpu)
}
}
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#[derive(Debug, Clone, Copy)]
pub enum InterruptSensitivity {
Level,
Edge,
}
pub struct InterruptController {
mpcore: &'static mut mpcore::RegisterBlock,
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}
impl InterruptController {
pub fn gic(mpcore: &'static mut mpcore::RegisterBlock) -> Self {
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InterruptController { mpcore }
}
pub fn disable_interrupts(&mut self) {
self.mpcore.iccicr.modify(|_, w| w.enable_ns(false)
.enable_s(false));
// FIXME: Should we disable the distributor globally when we disable interrupt (for a single
// core)?
// self.mpcore.icddcr.modify(|_, w| w.enable_secure(false)
// .enable_non_secure(false));
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}
/// enable interrupt signaling
pub fn enable_interrupts(&mut self) {
self.mpcore.iccicr.modify(|_, w| w.enable_ns(true)
.enable_s(true));
self.mpcore.icddcr.modify(|_, w| w.enable_secure(true));
// Enable all interrupts except those of the lowest priority.
self.mpcore.iccpmr.write(mpcore::ICCPMR::zeroed().priority(0xFF));
}
/// send software generated interrupt
pub fn send_sgi(&mut self, id: InterruptId, targets: TargetList) {
assert!(id.0 < 16);
self.mpcore.icdsgir.modify(|_, w| match targets {
TargetList::CPUList(list) => w.target_list_filter(0).cpu_target_list(list.0),
TargetList::Others => w.target_list_filter(0b01),
TargetList::This => w.target_list_filter(0b10)
}.sgiintid(id.0).satt(false));
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}
/// enable the interrupt *for this core*.
/// Not needed for SGI.
pub fn enable(&mut self, id: InterruptId, target_cpu: CPUCore, sensitivity: InterruptSensitivity, priority: u8) {
// only 5 bits of the priority is useful
assert!(priority < 32);
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self.disable_interrupts();
// enable
let m = (id.0 >> 5) as usize;
let n = (id.0 & 0x1F) as usize;
assert!(m < 3);
unsafe {
self.mpcore.icdiser[m].modify(|mut icdiser| *icdiser.set_bit(n, true));
}
// target cpu
let m = (id.0 >> 2) as usize;
let n = (8 * (id.0 & 3)) as usize;
unsafe {
self.mpcore.icdiptr[m].modify(|mut icdiptr| *icdiptr.set_bits(n..=n+1, target_cpu as u32 + 1));
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}
// sensitivity
let m = (id.0 >> 4) as usize;
let n = (2 * (id.0 & 0xF)) as usize;
unsafe {
self.mpcore.icdicfr[m].modify(|mut icdicfr| *icdicfr.set_bits(n..=n+1, match sensitivity {
InterruptSensitivity::Level => 0b00,
InterruptSensitivity::Edge => 0b10,
}));
}
// priority
let offset = (id.0 % 4) * 8;
let priority: u32 = (priority as u32) << (offset + 3);
let mask: u32 = 0xFFFFFFFF ^ (0xFF << offset);
unsafe {
self.mpcore.icdipr[id.0 as usize / 4].modify(|v| (v & mask) | priority);
}
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self.enable_interrupts();
}
pub fn end_interrupt(&mut self, id: InterruptId) {
self.mpcore.icceoir.modify(|_, w| w.eoiintid(id.0 as u32));
}
pub fn get_interrupt_id(&self) -> InterruptId {
InterruptId(self.mpcore.icciar.read().ackintid() as u8)
}
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}