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Commit 6e913c67 authored by Scott Wood's avatar Scott Wood Committed by Paul Mackerras
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[POWERPC] bootwrapper: Add 16-bit I/O, sync(), eieio(), and barrier() 



Also, include types.h from io.h, so callers don't have to.

Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
Acked-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent a73ac50c

arch/powerpc/boot/io.h

+49 −0
Original line number Diff line number Diff line 
#ifndef _IO_H

#define __IO_H



#include "types.h"



/*

 * Low-level I/O routines.

 *
@@ -20,6 +23,37 @@ static inline void out_8(volatile unsigned char *addr, int val) 
			     : "=m" (*addr) : "r" (val));

}



static inline unsigned in_le16(const volatile u16 *addr)

{

	unsigned ret;



	__asm__ __volatile__("lhbrx %0,0,%1; twi 0,%0,0; isync"

			     : "=r" (ret) : "r" (addr), "m" (*addr));



	return ret;

}



static inline unsigned in_be16(const volatile u16 *addr)

{

	unsigned ret;



	__asm__ __volatile__("lhz%U1%X1 %0,%1; twi 0,%0,0; isync"

			     : "=r" (ret) : "m" (*addr));

	return ret;

}



static inline void out_le16(volatile u16 *addr, int val)

{

	__asm__ __volatile__("sthbrx %1,0,%2; sync" : "=m" (*addr)

			     : "r" (val), "r" (addr));

}



static inline void out_be16(volatile u16 *addr, int val)

{

	__asm__ __volatile__("sth%U0%X0 %1,%0; sync"

			     : "=m" (*addr) : "r" (val));

}



static inline unsigned in_le32(const volatile unsigned *addr)

{

	unsigned ret;
@@ -50,4 +84,19 @@ static inline void out_be32(volatile unsigned *addr, int val) 
			     : "=m" (*addr) : "r" (val));

}



static inline void sync(void)

{

	asm volatile("sync" : : : "memory");

}



static inline void eieio(void)

{

	asm volatile("eieio" : : : "memory");

}



static inline void barrier(void)

{

	asm volatile("" : : : "memory");

}



#endif /* _IO_H */