1/* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10 * GNU General Public License for more details.
11 */
12
13#include <asm/barrier.h>
14
15static inline u32 __dcc_getstatus(void)
16{
17	u32 __ret;
18	asm volatile("mrc p14, 0, %0, c0, c1, 0	@ read comms ctrl reg"
19		: "=r" (__ret) : : "cc");
20
21	return __ret;
22}
23
24static inline char __dcc_getchar(void)
25{
26	char __c;
27
28	asm volatile("mrc p14, 0, %0, c0, c5, 0	@ read comms data reg"
29		: "=r" (__c));
30	isb();
31
32	return __c;
33}
34
35static inline void __dcc_putchar(char c)
36{
37	asm volatile("mcr p14, 0, %0, c0, c5, 0	@ write a char"
38		: /* no output register */
39		: "r" (c));
40	isb();
41}
42