104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _IO_H
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#define _IO_H
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#include "types.h"
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/*
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* Low-level I/O routines.
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*
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* Copied from <file:arch/powerpc/include/asm/io.h> (which has no copyright)
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*/
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static inline int in_8(const volatile unsigned char *addr)
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{
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int ret;
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__asm__ __volatile__("lbz%U1%X1 %0,%1; twi 0,%0,0; isync"
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: "=r" (ret) : "m" (*addr));
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return ret;
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}
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static inline void out_8(volatile unsigned char *addr, int val)
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{
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__asm__ __volatile__("stb%U0%X0 %1,%0; sync"
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: "=m" (*addr) : "r" (val));
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}
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static inline unsigned in_le16(const volatile u16 *addr)
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{
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unsigned ret;
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__asm__ __volatile__("lhbrx %0,0,%1; twi 0,%0,0; isync"
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: "=r" (ret) : "r" (addr), "m" (*addr));
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return ret;
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}
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static inline unsigned in_be16(const volatile u16 *addr)
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{
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unsigned ret;
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__asm__ __volatile__("lhz%U1%X1 %0,%1; twi 0,%0,0; isync"
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: "=r" (ret) : "m" (*addr));
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return ret;
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}
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static inline void out_le16(volatile u16 *addr, int val)
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{
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__asm__ __volatile__("sthbrx %1,0,%2; sync" : "=m" (*addr)
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: "r" (val), "r" (addr));
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}
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static inline void out_be16(volatile u16 *addr, int val)
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{
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__asm__ __volatile__("sth%U0%X0 %1,%0; sync"
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: "=m" (*addr) : "r" (val));
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}
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static inline unsigned in_le32(const volatile unsigned *addr)
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{
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unsigned ret;
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__asm__ __volatile__("lwbrx %0,0,%1; twi 0,%0,0; isync"
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: "=r" (ret) : "r" (addr), "m" (*addr));
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return ret;
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}
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static inline unsigned in_be32(const volatile unsigned *addr)
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{
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unsigned ret;
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__asm__ __volatile__("lwz%U1%X1 %0,%1; twi 0,%0,0; isync"
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: "=r" (ret) : "m" (*addr));
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return ret;
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}
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static inline void out_le32(volatile unsigned *addr, int val)
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{
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__asm__ __volatile__("stwbrx %1,0,%2; sync" : "=m" (*addr)
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: "r" (val), "r" (addr));
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}
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static inline void out_be32(volatile unsigned *addr, int val)
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{
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__asm__ __volatile__("stw%U0%X0 %1,%0; sync"
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: "=m" (*addr) : "r" (val));
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}
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static inline void sync(void)
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{
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asm volatile("sync" : : : "memory");
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}
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static inline void eieio(void)
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{
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asm volatile("eieio" : : : "memory");
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}
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static inline void barrier(void)
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{
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asm volatile("" : : : "memory");
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}
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#endif /* _IO_H */
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