io.h
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#ifndef __IO_H__
#define __IO_H__
#define __iomem
/*
* 8, 16 and 32 bit, big and little endian I/O operations, with barrier.
*
* Read operations have additional twi & isync to make sure the read
* is actually performed (i.e. the data has come back) before we start
* executing any following instructions.
*/
static inline int in_8(const volatile unsigned char __iomem *addr)
{
int ret;
__asm__ __volatile__(
"sync; lbz%U1%X1 %0,%1;\n"
"twi 0,%0,0;\n"
"isync" : "=r" (ret) : "m" (*addr));
return ret;
}
static inline void out_8(volatile unsigned char __iomem *addr, int val)
{
__asm__ __volatile__("stb%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
}
extern inline int in_le16(const volatile unsigned short __iomem *addr)
{
int ret;
__asm__ __volatile__("sync; lhbrx %0,0,%1;\n"
"twi 0,%0,0;\n"
"isync" : "=r" (ret) :
"r" (addr), "m" (*addr));
return ret;
}
extern inline int in_be16(const volatile unsigned short __iomem *addr)
{
int ret;
__asm__ __volatile__("sync; lhz%U1%X1 %0,%1;\n"
"twi 0,%0,0;\n"
"isync" : "=r" (ret) : "m" (*addr));
return ret;
}
extern inline void out_le16(volatile unsigned short __iomem *addr, int val)
{
__asm__ __volatile__("sync; sthbrx %1,0,%2" : "=m" (*addr) :
"r" (val), "r" (addr));
}
extern inline void out_be16(volatile unsigned short __iomem *addr, int val)
{
__asm__ __volatile__("sync; sth%U0%X0 %1,%0" : "=m" (*addr) : "r" (val));
}
extern inline unsigned in_le32(const volatile unsigned __iomem *addr)
{
unsigned ret;
__asm__ __volatile__("sync; lwbrx %0,0,%1;\n"
"twi 0,%0,0;\n"
"isync" : "=r" (ret) :
"r" (addr), "m" (*addr));
return ret;
}
extern inline unsigned in_be32(const volatile unsigned __iomem *addr)
{
unsigned ret;
__asm__ __volatile__("sync; lwz%U1%X1 %0,%1;\n"
"twi 0,%0,0;\n"
"isync" : "=r" (ret) : "m" (*addr));
return ret;
}
extern inline void out_le32(volatile unsigned __iomem *addr, int val)
{
__asm__ __volatile__("sync; stwbrx %1,0,%2" : "=m" (*addr) :
"r" (val), "r" (addr));
}
extern inline void out_be32(volatile unsigned __iomem *addr, int val)
{
__asm__ __volatile__("sync; stw%U0%X0 %1,%0" : "=m" (*addr) : "r" (val));
}
#endif