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103 lines
2.1 KiB
103 lines
2.1 KiB
/* 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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