1#ifndef _IO_H 2#define __IO_H 3 4#include "types.h" 5 6/* 7 * Low-level I/O routines. 8 * 9 * Copied from <file:arch/powerpc/include/asm/io.h> (which has no copyright) 10 */ 11static inline int in_8(const volatile unsigned char *addr) 12{ 13 int ret; 14 15 __asm__ __volatile__("lbz%U1%X1 %0,%1; twi 0,%0,0; isync" 16 : "=r" (ret) : "m" (*addr)); 17 return ret; 18} 19 20static inline void out_8(volatile unsigned char *addr, int val) 21{ 22 __asm__ __volatile__("stb%U0%X0 %1,%0; sync" 23 : "=m" (*addr) : "r" (val)); 24} 25 26static inline unsigned in_le16(const volatile u16 *addr) 27{ 28 unsigned ret; 29 30 __asm__ __volatile__("lhbrx %0,0,%1; twi 0,%0,0; isync" 31 : "=r" (ret) : "r" (addr), "m" (*addr)); 32 33 return ret; 34} 35 36static inline unsigned in_be16(const volatile u16 *addr) 37{ 38 unsigned ret; 39 40 __asm__ __volatile__("lhz%U1%X1 %0,%1; twi 0,%0,0; isync" 41 : "=r" (ret) : "m" (*addr)); 42 return ret; 43} 44 45static inline void out_le16(volatile u16 *addr, int val) 46{ 47 __asm__ __volatile__("sthbrx %1,0,%2; sync" : "=m" (*addr) 48 : "r" (val), "r" (addr)); 49} 50 51static inline void out_be16(volatile u16 *addr, int val) 52{ 53 __asm__ __volatile__("sth%U0%X0 %1,%0; sync" 54 : "=m" (*addr) : "r" (val)); 55} 56 57static inline unsigned in_le32(const volatile unsigned *addr) 58{ 59 unsigned ret; 60 61 __asm__ __volatile__("lwbrx %0,0,%1; twi 0,%0,0; isync" 62 : "=r" (ret) : "r" (addr), "m" (*addr)); 63 return ret; 64} 65 66static inline unsigned in_be32(const volatile unsigned *addr) 67{ 68 unsigned ret; 69 70 __asm__ __volatile__("lwz%U1%X1 %0,%1; twi 0,%0,0; isync" 71 : "=r" (ret) : "m" (*addr)); 72 return ret; 73} 74 75static inline void out_le32(volatile unsigned *addr, int val) 76{ 77 __asm__ __volatile__("stwbrx %1,0,%2; sync" : "=m" (*addr) 78 : "r" (val), "r" (addr)); 79} 80 81static inline void out_be32(volatile unsigned *addr, int val) 82{ 83 __asm__ __volatile__("stw%U0%X0 %1,%0; sync" 84 : "=m" (*addr) : "r" (val)); 85} 86 87static inline void sync(void) 88{ 89 asm volatile("sync" : : : "memory"); 90} 91 92static inline void eieio(void) 93{ 94 asm volatile("eieio" : : : "memory"); 95} 96 97static inline void barrier(void) 98{ 99 asm volatile("" : : : "memory"); 100} 101 102#endif /* _IO_H */ 103