33 lines
623 B
C
33 lines
623 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.
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*/
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#include <asm/barrier.h>
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static inline u32 __dcc_getstatus(void)
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{
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u32 __ret;
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asm volatile("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg"
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: "=r" (__ret) : : "cc");
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return __ret;
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}
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static inline char __dcc_getchar(void)
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{
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char __c;
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asm volatile("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
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: "=r" (__c));
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isb();
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return __c;
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}
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static inline void __dcc_putchar(char c)
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{
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asm volatile("mcr p14, 0, %0, c0, c5, 0 @ write a char"
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: /* no output register */
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: "r" (c));
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isb();
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}
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