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// SPDX-License-Identifier: GPL-2.0
/*
* RISC-V SBI based earlycon
*
* Copyright (C) 2018 Anup Patel <anup@brainfault.org>
*/
#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/serial_core.h>
#include <asm/sbi.h>
static void sbi_putc(struct uart_port *port, unsigned char c)
{
sbi_console_putchar(c);
}
static void sbi_0_1_console_write(struct console *con,
const char *s, unsigned int n)
{
struct earlycon_device *dev = con->data;
uart_console_write(&dev->port, s, n, sbi_putc);
}
static void sbi_dbcn_console_write(struct console *con,
const char *s, unsigned int n)
{
int ret;
while (n) {
ret = sbi_debug_console_write(s, n);
if (ret < 0)
break;
s += ret;
n -= ret;
}
}
static int __init early_sbi_setup(struct earlycon_device *device,
const char *opt)
{
if (sbi_debug_console_available)
device->con->write = sbi_dbcn_console_write;
else if (IS_ENABLED(CONFIG_RISCV_SBI_V01))
device->con->write = sbi_0_1_console_write;
else
return -ENODEV;
return 0;
}
EARLYCON_DECLARE(sbi, early_sbi_setup);
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