| Christopher Covington | 4061f49 | 2014-05-22 18:07:18 -0400 | [diff] [blame] | 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 | } |