27c9d80f51
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102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#pragma once
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#include <stdint.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 uint8_t in_8(const volatile uint8_t *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 uint8_t *addr, uint8_t 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 uint16_t in_le16(const volatile uint16_t *addr)
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{
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uint32_t 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 uint16_t in_be16(const volatile uint16_t *addr)
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{
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uint32_t 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 uint16_t *addr, uint16_t 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 uint16_t *addr, uint16_t 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 uint32_t in_le32(const volatile uint32_t *addr)
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{
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uint32_t 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 uint32_t in_be32(const volatile uint32_t *addr)
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{
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uint32_t 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 uint32_t *addr, uint32_t 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 uint32_t *addr, uint32_t 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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