1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * RISC-V SBI based earlycon
4  *
5  * Copyright (C) 2018 Anup Patel <anup@brainfault.org>
6  */
7 #include <linux/kernel.h>
8 #include <linux/console.h>
9 #include <linux/init.h>
10 #include <linux/serial_core.h>
11 #include <asm/sbi.h>
12 
13 static void sbi_putc(struct uart_port *port, unsigned char c)
14 {
15 	sbi_console_putchar(c);
16 }
17 
18 static void sbi_console_write(struct console *con,
19 			      const char *s, unsigned n)
20 {
21 	struct earlycon_device *dev = con->data;
22 	uart_console_write(&dev->port, s, n, sbi_putc);
23 }
24 
25 static int __init early_sbi_setup(struct earlycon_device *device,
26 				  const char *opt)
27 {
28 	device->con->write = sbi_console_write;
29 	return 0;
30 }
31 EARLYCON_DECLARE(sbi, early_sbi_setup);
32