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); 29