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114 lines
3.7 KiB
Rust
114 lines
3.7 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2022 Andre Richter <andre.o.richter@gmail.com>
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//! BSP driver support.
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use super::{exception, memory::map::mmio};
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use crate::{
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bsp::device_driver,
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console, driver as generic_driver,
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exception::{self as generic_exception},
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};
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use core::sync::atomic::{AtomicBool, Ordering};
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//--------------------------------------------------------------------------------------------------
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// Global instances
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//--------------------------------------------------------------------------------------------------
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static PL011_UART: device_driver::PL011Uart =
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unsafe { device_driver::PL011Uart::new(mmio::PL011_UART_START) };
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static GPIO: device_driver::GPIO = unsafe { device_driver::GPIO::new(mmio::GPIO_START) };
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#[cfg(feature = "bsp_rpi3")]
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static INTERRUPT_CONTROLLER: device_driver::InterruptController =
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unsafe { device_driver::InterruptController::new(mmio::PERIPHERAL_IC_START) };
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#[cfg(feature = "bsp_rpi4")]
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static INTERRUPT_CONTROLLER: device_driver::GICv2 =
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unsafe { device_driver::GICv2::new(mmio::GICD_START, mmio::GICC_START) };
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//--------------------------------------------------------------------------------------------------
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// Private Code
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//--------------------------------------------------------------------------------------------------
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/// This must be called only after successful init of the UART driver.
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fn post_init_uart() -> Result<(), &'static str> {
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console::register_console(&PL011_UART);
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Ok(())
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}
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/// This must be called only after successful init of the GPIO driver.
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fn post_init_gpio() -> Result<(), &'static str> {
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GPIO.map_pl011_uart();
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Ok(())
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}
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/// This must be called only after successful init of the interrupt controller driver.
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fn post_init_interrupt_controller() -> Result<(), &'static str> {
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generic_exception::asynchronous::register_irq_manager(&INTERRUPT_CONTROLLER);
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Ok(())
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}
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fn driver_uart() -> Result<(), &'static str> {
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let uart_descriptor = generic_driver::DeviceDriverDescriptor::new(
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&PL011_UART,
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Some(post_init_uart),
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Some(exception::asynchronous::irq_map::PL011_UART),
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);
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generic_driver::driver_manager().register_driver(uart_descriptor);
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Ok(())
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}
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fn driver_gpio() -> Result<(), &'static str> {
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let gpio_descriptor =
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generic_driver::DeviceDriverDescriptor::new(&GPIO, Some(post_init_gpio), None);
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generic_driver::driver_manager().register_driver(gpio_descriptor);
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Ok(())
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}
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fn driver_interrupt_controller() -> Result<(), &'static str> {
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let interrupt_controller_descriptor = generic_driver::DeviceDriverDescriptor::new(
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&INTERRUPT_CONTROLLER,
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Some(post_init_interrupt_controller),
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None,
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);
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generic_driver::driver_manager().register_driver(interrupt_controller_descriptor);
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Ok(())
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}
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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/// Initialize the driver subsystem.
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///
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/// # Safety
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///
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/// See child function calls.
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pub unsafe fn init() -> Result<(), &'static str> {
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static INIT_DONE: AtomicBool = AtomicBool::new(false);
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if INIT_DONE.load(Ordering::Relaxed) {
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return Err("Init already done");
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}
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driver_uart()?;
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driver_gpio()?;
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driver_interrupt_controller()?;
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INIT_DONE.store(true, Ordering::Relaxed);
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Ok(())
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}
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/// Minimal code needed to bring up the console in QEMU (for testing only). This is often less steps
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/// than on real hardware due to QEMU's abstractions.
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#[cfg(feature = "test_build")]
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pub fn qemu_bring_up_console() {
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console::register_console(&PL011_UART);
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}
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