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_console_write(struct console *con,
14 			      const char *s, unsigned int n)
15 {
16 	int i;
17 
18 	for (i = 0; i < n; ++i)
19 		sbi_console_putchar(s[i]);
20 }
21 
22 static int __init early_sbi_setup(struct earlycon_device *device,
23 				  const char *opt)
24 {
25 	device->con->write = sbi_console_write;
26 	return 0;
27 }
28 EARLYCON_DECLARE(sbi, early_sbi_setup);
29