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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-m68knommu/] [io_hw_swap.h] - Blame information for rev 1765

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1 1633 jcastillo
#ifndef _M68K_IO_HW_SWAP_H
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#define _M68K_IO_HW_SWAP_H
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/*
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 * swap functions are sometimes needed to interface little-endian hardware
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 */
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static inline unsigned short _swapw(volatile unsigned short v)
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{
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    return ((v << 8) | (v >> 8));
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}
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static inline unsigned int _swapl(volatile unsigned long v)
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{
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    return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
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}
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/*
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 * readX/writeX() are used to access memory mapped devices. On some
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 * architectures the memory mapped IO stuff needs to be accessed
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 * differently. On the m68k architecture, we just read/write the
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 * memory location directly.
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 */
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/* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
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 * two accesses to memory, which may be undesireable for some devices.
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 */
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#define readb(addr) \
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    ({ unsigned char __v = (*(volatile unsigned char *) (addr)); __v; })
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#define readw(addr) \
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    ({ unsigned short __v = (*(volatile unsigned short *) (addr)); __v; })
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#define readl(addr) \
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    ({ unsigned int __v = (*(volatile unsigned int *) (addr)); __v; })
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#define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
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#define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
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#define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
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/* There is no difference between I/O and memory on 68k, these are the same */
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#define inb(addr) \
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    ({ unsigned char __v = (*(volatile unsigned char *) (addr)); __v; })
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#define inw(addr) \
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    ({ unsigned short __v = (*(volatile unsigned short *) (addr)); \
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       _swapw(__v); })
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#define inl(addr) \
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    ({ unsigned int __v = (*(volatile unsigned int *) (addr)); _swapl(__v); })
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#define outb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
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#define outw(b,addr) ((*(volatile unsigned short *) (addr)) = (_swapw(b)))
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#define outl(b,addr) ((*(volatile unsigned int *) (addr)) = (_swapl(b)))
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/* FIXME: these need to be optimized.  Watch out for byte swapping, they
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 * are used mostly for Intel devices... */
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#define outsw(addr,buf,len) \
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    ({ unsigned short * __e = (unsigned short *)(buf) + (len); \
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       unsigned short * __p = (unsigned short *)(buf); \
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       while (__p < __e) { \
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          *(volatile unsigned short *)(addr) = *__p++;\
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       } \
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     })
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#define insw(addr,buf,len) \
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    ({ unsigned short * __e = (unsigned short *)(buf) + (len); \
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       unsigned short * __p = (unsigned short *)(buf); \
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       while (__p < __e) { \
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          *(__p++) = *(volatile unsigned short *)(addr); \
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       } \
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     })
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static inline unsigned char get_user_byte_io(const char * addr)
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{
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        register unsigned char _v;
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        __asm__ __volatile__ ("moveb %1,%0":"=dm" (_v):"m" (*addr));
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        return _v;
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}
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#define inb_p(addr) get_user_byte_io((char *)(addr))
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static inline void put_user_byte_io(char val,char *addr)
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{
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        __asm__ __volatile__ ("moveb %0,%1"
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                              : /* no outputs */
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                              :"idm" (val),"m" (*addr)
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                              : "memory");
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}
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#define outb_p(x,addr) put_user_byte_io((x),(char *)(addr))
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/*
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 * Change virtual addresses to physical addresses and vv.
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 * These are trivial on the 1:1 Linux/i386 mapping (but if we ever
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 * make the kernel segment mapped at 0, we need to do translation
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 * on the i386 as well)
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 */
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extern unsigned long mm_vtop(unsigned long addr);
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extern unsigned long mm_ptov(unsigned long addr);
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extern inline unsigned long virt_to_phys(volatile void * address)
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{
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        return (unsigned long) mm_vtop((unsigned long)address);
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}
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extern inline void * phys_to_virt(unsigned long address)
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{
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        return (void *) mm_ptov(address);
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}
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/*
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 * IO bus memory addresses are also 1:1 with the physical address
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 */
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#define virt_to_bus virt_to_phys
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#define bus_to_virt phys_to_virt
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#endif /* _M68K_IO_HW_SWAP_H */

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