1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * RISC-V SBI based earlycon
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2018 Anup Patel <anup@brainfault.org>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun #include <linux/kernel.h>
8*4882a593Smuzhiyun #include <linux/console.h>
9*4882a593Smuzhiyun #include <linux/init.h>
10*4882a593Smuzhiyun #include <linux/serial_core.h>
11*4882a593Smuzhiyun #include <asm/sbi.h>
12*4882a593Smuzhiyun
sbi_putc(struct uart_port * port,int c)13*4882a593Smuzhiyun static void sbi_putc(struct uart_port *port, int c)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun sbi_console_putchar(c);
16*4882a593Smuzhiyun }
17*4882a593Smuzhiyun
sbi_console_write(struct console * con,const char * s,unsigned n)18*4882a593Smuzhiyun static void sbi_console_write(struct console *con,
19*4882a593Smuzhiyun const char *s, unsigned n)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun struct earlycon_device *dev = con->data;
22*4882a593Smuzhiyun uart_console_write(&dev->port, s, n, sbi_putc);
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun
early_sbi_setup(struct earlycon_device * device,const char * opt)25*4882a593Smuzhiyun static int __init early_sbi_setup(struct earlycon_device *device,
26*4882a593Smuzhiyun const char *opt)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun device->con->write = sbi_console_write;
29*4882a593Smuzhiyun return 0;
30*4882a593Smuzhiyun }
31*4882a593Smuzhiyun EARLYCON_DECLARE(sbi, early_sbi_setup);
32