drivers/tty/serial/earlycon-semihost.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2012 ARM Ltd.
   4  * Author: Marc Zyngier <marc.zyngier@arm.com>
   5  *
   6  * Adapted for ARM and earlycon:
   7  * Copyright (C) 2014 Linaro Ltd.
   8  * Author: Rob Herring <robh@kernel.org>
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/console.h>
  12 #include <linux/init.h>
  13 #include <linux/serial_core.h>
  14 #include <asm/semihost.h>
  15
  16 static void smh_write(struct console *con, const char *s, unsigned n)
  17 {
  18         struct earlycon_device *dev = con->data;
  19         uart_console_write(&dev->port, s, n, smh_putc);
  20 }
  21
  22 static int
  23 __init early_smh_setup(struct earlycon_device *device, const char *opt)
  24 {
  25         device->con->write = smh_write;
  26         return 0;
  27 }
  28 EARLYCON_DECLARE(smh, early_smh_setup);