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