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
__dcc_getstatus(void)15 static 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
__dcc_getchar(void)24 static 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
__dcc_putchar(char c)35 static 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