gsp.rs

// SPDX-License-Identifier: GPL-2.0

use kernel::{
    io::poll::read_poll_timeout,
    prelude::*,
    time::Delta, //
};

use crate::{
    driver::Bar0,
    falcon::{
        Falcon,
        FalconEngine,
        PFalcon2Base,
        PFalconBase, //
    },
    regs::{
        self,
        macros::RegisterBase, //
    },
};

/// Type specifying the `Gsp` falcon engine. Cannot be instantiated.
pub(crate) struct Gsp(());

impl RegisterBase<PFalconBase> for Gsp {
    const BASE: usize = 0x00110000;
}

impl RegisterBase<PFalcon2Base> for Gsp {
    const BASE: usize = 0x00111000;
}

impl FalconEngine for Gsp {
    const ID: Self = Gsp(());
}

impl Falcon<Gsp> {
    /// Clears the SWGEN0 bit in the Falcon's IRQ status clear register to
    /// allow GSP to signal CPU for processing new messages in message queue.
    pub(crate) fn clear_swgen0_intr(&self, bar: &Bar0) {
        regs::NV_PFALCON_FALCON_IRQSCLR::default()
            .set_swgen0(true)
            .write(bar, &Gsp::ID);
    }

    /// Checks if GSP reload/resume has completed during the boot process.
    pub(crate) fn check_reload_completed(&self, bar: &Bar0, timeout: Delta) -> Result<bool> {
        read_poll_timeout(
            || Ok(regs::NV_PGC6_BSI_SECURE_SCRATCH_14::read(bar)),
            |val| val.boot_stage_3_handoff(),
            Delta::ZERO,
            timeout,
        )
        .map(|_| true)
    }
}