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 */ 11 static 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 20 static 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 26 static 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 36 static 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 45 static 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 51 static 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 57 static 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 66 static 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 75 static 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 81 static 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 87 static inline void sync(void) 88 { 89 asm volatile("sync" : : : "memory"); 90 } 91 92 static inline void eieio(void) 93 { 94 asm volatile("eieio" : : : "memory"); 95 } 96 97 static inline void barrier(void) 98 { 99 asm volatile("" : : : "memory"); 100 } 101 102 #endif /* _IO_H */ 103