14061f498SChristopher Covington /* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved. 24061f498SChristopher Covington * 34061f498SChristopher Covington * This program is free software; you can redistribute it and/or modify 44061f498SChristopher Covington * it under the terms of the GNU General Public License version 2 and 54061f498SChristopher Covington * only version 2 as published by the Free Software Foundation. 64061f498SChristopher Covington * 74061f498SChristopher Covington * This program is distributed in the hope that it will be useful, 84061f498SChristopher Covington * but WITHOUT ANY WARRANTY; without even the implied warranty of 94061f498SChristopher Covington * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 104061f498SChristopher Covington * GNU General Public License for more details. 114061f498SChristopher Covington */ 124061f498SChristopher Covington 134061f498SChristopher Covington #include <asm/barrier.h> 144061f498SChristopher Covington 154061f498SChristopher Covington static inline u32 __dcc_getstatus(void) 164061f498SChristopher Covington { 174061f498SChristopher Covington u32 __ret; 184061f498SChristopher Covington asm volatile("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg" 194061f498SChristopher Covington : "=r" (__ret) : : "cc"); 204061f498SChristopher Covington 214061f498SChristopher Covington return __ret; 224061f498SChristopher Covington } 234061f498SChristopher Covington 244061f498SChristopher Covington static inline char __dcc_getchar(void) 254061f498SChristopher Covington { 264061f498SChristopher Covington char __c; 274061f498SChristopher Covington 284061f498SChristopher Covington asm volatile("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg" 294061f498SChristopher Covington : "=r" (__c)); 304061f498SChristopher Covington isb(); 314061f498SChristopher Covington 324061f498SChristopher Covington return __c; 334061f498SChristopher Covington } 344061f498SChristopher Covington 354061f498SChristopher Covington static inline void __dcc_putchar(char c) 364061f498SChristopher Covington { 374061f498SChristopher Covington asm volatile("mcr p14, 0, %0, c0, c5, 0 @ write a char" 384061f498SChristopher Covington : /* no output register */ 394061f498SChristopher Covington : "r" (c)); 404061f498SChristopher Covington isb(); 414061f498SChristopher Covington } 42