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
sbi_putc(struct uart_port * port,int c)13 static void sbi_putc(struct uart_port *port, int c)
14 {
15 sbi_console_putchar(c);
16 }
17
sbi_console_write(struct console * con,const char * s,unsigned n)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
early_sbi_setup(struct earlycon_device * device,const char * opt)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