io.h

这个vivi的功能很丰富

#ifndef _VIVI_IO_H_
#define _VIVI_IO_H_

//#define readb(x)	*(volatile unsigned char *)(x)
//#define readw(x)	*(volatile unsigned short *)(x)
//#define readl(x)	*(volatile unsigned long *)(x)

//#define writeb(v,x)	*(volatile unsigned char *)(x) = (v)
//#define writew(v,x)	*(volatile unsigned short *)(x) = (v)
//#define writel(v,x)	*(volatile unsigned long *)(x) = (v)

static inline u8 readb(__u32 port)
{
	return *(volatile __u8 *)(port);
}
/*static inline unsigned short readw(__u32 addr)
{
	unsigned short val;
	__asm__( "mov   r2,%1\n" \
             "ldrh	%0, [r2]\n" \
             : "=r" (val) \
             : "r" (addr) \
             : "r2");
    return val;
}*/
static inline unsigned short readw(__u32 addr)
{
    register unsigned short val;
	__asm__ __volatile__ ( "ldrh	%0, [%1]\n" \
             : "=r" (val)
             : "r" (addr));
    return val;
}
static inline u32 readl(__u32 port)
{
	return *(volatile __u32 *)(port);
}

static inline void writeb(__u8 data, __u32 port)
{
	*(volatile __u8 *)(port) = data;
}
/*static inline void writew(__u16 val, __u32 addr)
{
	__asm__( "mov   r2,%1\n" \
             "strh	%0, [r2]\n" \
             : \
             : "r" (val),"r" (addr) \
             : "r2");
    return val;
} */
static inline void writew(__u16 val, __u32 addr)
{
    __asm__ __volatile__ ( "strh	%0, [%1]\n" \
             :: "r" (val),"r" (addr));
}
static inline void writel(__u32 data, __u32 port)
{
	*(volatile __u32 *)(port) = data;
}

#endif /* _VIVI_IO_H_ */