drivers/tty/serial/earlycon-riscv-sbi.c

   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);