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// ============================================================================
// drivers/char/pl011.cpp — PL011 UART console driver + device (aarch64)
//
// Stub implementation that compiles but does no real I/O yet.
// TODO: Program IBRD, FBRD, LCR_H, CR registers for actual UART output.
// ============================================================================
#include <kernel/console_driver.h>
#include <kernel/early_driver.h>
#include <kernel/early_device.h>
#include <kernel/platform_bus.h>
// ── PL011Device ───────────────────────────────────────────────────────────
class PL011Device : public Device, public EarlyDevice<PL011Device> {
public:
explicit PL011Device(uintptr_t base_addr) : base_(base_addr) {}
const char* name() const override { return "uart0"; }
uintptr_t base() const { return base_; }
private:
uintptr_t base_;
};
// ── PL011Console driver ──────────────────────────────────────────────────
class PL011Console : public ConsoleDriver,
public EarlyDriver<PL011Console> {
public:
PL011Console() = default;
const char* name() const override { return "pl011-uart"; }
bool init() override {
auto* dev = static_cast<PL011Device*>(device());
base_ = dev->base();
// TODO: Configure UART registers at base_:
// UARTIBRD (offset 0x24) — integer baud rate divisor
// UARTFBRD (offset 0x28) — fractional baud rate divisor
// UARTLCR_H (offset 0x2C) — line control (8N1, FIFO enable)
// UARTCR (offset 0x30) — control register (TX enable, UART enable)
initialized_ = true;
return true;
}
void shutdown() override {
initialized_ = false;
}
void putchar(char c) override {
if (!initialized_) return;
// TODO: while (*(volatile uint32_t*)(base_ + 0x18) & (1 << 5)) {}
// *(volatile uint32_t*)(base_ + 0x00) = c;
(void)c;
}
void clear() override {
// UART has no screen to clear
}
private:
uintptr_t base_ = 0;
bool initialized_ = false;
};
// ── Driver init function ──────────────────────────────────────────────────
namespace console {
void init_pl011(uintptr_t base_addr) {
auto* dev = PL011Device::create(base_addr);
platform::bus().add_device(dev);
auto* drv = PL011Console::create();
drv->bind(dev);
drv->init();
console::register_driver(drv);
}
} // namespace console
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