1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.
3*4882a593Smuzhiyun */
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <asm/barrier.h>
6*4882a593Smuzhiyun
__dcc_getstatus(void)7*4882a593Smuzhiyun static inline u32 __dcc_getstatus(void)
8*4882a593Smuzhiyun {
9*4882a593Smuzhiyun u32 __ret;
10*4882a593Smuzhiyun asm volatile("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg"
11*4882a593Smuzhiyun : "=r" (__ret) : : "cc");
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun return __ret;
14*4882a593Smuzhiyun }
15*4882a593Smuzhiyun
__dcc_getchar(void)16*4882a593Smuzhiyun static inline char __dcc_getchar(void)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun char __c;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun asm volatile("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
21*4882a593Smuzhiyun : "=r" (__c));
22*4882a593Smuzhiyun isb();
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun return __c;
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
__dcc_putchar(char c)27*4882a593Smuzhiyun static inline void __dcc_putchar(char c)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun asm volatile("mcr p14, 0, %0, c0, c5, 0 @ write a char"
30*4882a593Smuzhiyun : /* no output register */
31*4882a593Smuzhiyun : "r" (c));
32*4882a593Smuzhiyun isb();
33*4882a593Smuzhiyun }
34