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72 lines
2.3 KiB
Rust
72 lines
2.3 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2023 Andre Richter <andre.o.richter@gmail.com>
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//! BSP driver support.
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use super::memory::map::mmio;
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use crate::{bsp::device_driver, console, driver as generic_driver};
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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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//--------------------------------------------------------------------------------------------------
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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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fn driver_uart() -> Result<(), &'static str> {
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let uart_descriptor =
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generic_driver::DeviceDriverDescriptor::new(&PL011_UART, Some(post_init_uart));
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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 = generic_driver::DeviceDriverDescriptor::new(&GPIO, Some(post_init_gpio));
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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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//--------------------------------------------------------------------------------------------------
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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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INIT_DONE.store(true, Ordering::Relaxed);
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Ok(())
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}
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