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