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/* SPDX-License-Identifier: MIT */
#include <stdarg.h>
#include "adt.h"
#include "iodev.h"
#include "types.h"
#include "uart.h"
#include "uart_regs.h"
#include "utils.h"
#include "vsprintf.h"
#define UART_CLOCK 24000000
static u64 uart_base = 0;
int uart_init(void)
{
int path[8];
int node = adt_path_offset_trace(adt, "/arm-io/uart0", path);
if (node < 0) {
printf("!!! UART node not found!\n");
return -1;
}
if (adt_get_reg(adt, path, "reg", 0, &uart_base, NULL)) {
printf("!!! Failed to get UART reg property!\n");
return -1;
}
return 0;
}
void uart_putbyte(u8 c)
{
if (!uart_base)
return;
while (!(read32(uart_base + UTRSTAT) & UTRSTAT_TXBE))
;
write32(uart_base + UTXH, c);
}
u8 uart_getbyte(void)
{
if (!uart_base)
return 0;
while (!(read32(uart_base + UTRSTAT) & UTRSTAT_RXD))
;
return read32(uart_base + URXH);
}
void uart_putchar(u8 c)
{
if (c == '\n')
uart_putbyte('\r');
uart_putbyte(c);
}
u8 uart_getchar(void)
{
return uart_getbyte();
}
void uart_puts(const char *s)
{
while (*s)
uart_putchar(*(s++));
uart_putchar('\n');
}
void uart_write(const void *buf, size_t count)
{
const u8 *p = buf;
while (count--)
uart_putbyte(*p++);
}
size_t uart_read(void *buf, size_t count)
{
u8 *p = buf;
size_t recvd = 0;
while (count--) {
*p++ = uart_getbyte();
recvd++;
}
return recvd;
}
void uart_setbaud(int baudrate)
{
if (!uart_base)
return;
uart_flush();
write32(uart_base + UBRDIV, ((UART_CLOCK / baudrate + 7) / 16) - 1);
}
void uart_flush(void)
{
if (!uart_base)
return;
while (!(read32(uart_base + UTRSTAT) & UTRSTAT_TXE))
;
}
void uart_clear_irqs(void)
{
if (!uart_base)
return;
write32(uart_base + UTRSTAT, UTRSTAT_TXTHRESH | UTRSTAT_RXTHRESH | UTRSTAT_RXTO);
}
int uart_printf(const char *fmt, ...)
{
va_list args;
char buffer[512];
int i;
va_start(args, fmt);
i = vsnprintf(buffer, sizeof(buffer), fmt, args);
va_end(args);
uart_write(buffer, min(i, (int)(sizeof(buffer) - 1)));
return i;
}
static bool uart_iodev_can_write(void *opaque)
{
UNUSED(opaque);
return true;
}
static ssize_t uart_iodev_can_read(void *opaque)
{
UNUSED(opaque);
if (!uart_base)
return 0;
return (read32(uart_base + UTRSTAT) & UTRSTAT_RXD) ? 1 : 0;
}
static ssize_t uart_iodev_read(void *opaque, void *buf, size_t len)
{
UNUSED(opaque);
return uart_read(buf, len);
}
static ssize_t uart_iodev_write(void *opaque, const void *buf, size_t len)
{
UNUSED(opaque);
uart_write(buf, len);
return len;
}
static struct iodev_ops iodev_uart_ops = {
.can_read = uart_iodev_can_read,
.can_write = uart_iodev_can_write,
.read = uart_iodev_read,
.write = uart_iodev_write,
};
struct iodev iodev_uart = {
.ops = &iodev_uart_ops,
.usage = USAGE_CONSOLE | USAGE_UARTPROXY,
.lock = SPINLOCK_INIT,
};
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