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4061f498 CC |
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 | ||
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 | ||
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 | ||
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 | } |