Commit d97cf70a authored by Greg Ungerer's avatar Greg Ungerer
Browse files

m68k: use asm-generic/io.h for non-MMU io access functions 



There is nothing really special about the non-MMU m68k IO access functions.
So we can easily switch to using the asm-generic/io.h functions.

The only thing we do need to handle is that historically the m68k IO access
functions for readw/readl/writew/writel use native CPU endian ordering. So
for us on m68k/ColdFire that means they are big-endian. Leave the existing
set of _raw_read/__raw_write and read/write macros in place to deal with
them. (They are ripe for later cleanup, but that is for another patch).

Signed-off-by: default avatarGreg Ungerer <gerg@linux-m68k.org>
Reviewed-by: default avatarAngelo Dureghello <angelo@sysam.it>
Tested-by: default avatarAngelo Dureghello <angelo@sysam.it>
parent f8f33048

arch/m68k/include/asm/io_no.h

+5 −174
Original line number Diff line number Diff line
@@ -2,40 +2,11 @@ 
#ifndef _M68KNOMMU_IO_H

#define _M68KNOMMU_IO_H



#ifdef __KERNEL__



#define ARCH_HAS_IOREMAP_WT



#include <asm/virtconvert.h>

#include <asm-generic/iomap.h>



/*

 * These are for ISA/PCI shared memory _only_ and should never be used

 * on any other type of memory, including Zorro memory. They are meant to

 * access the bus in the bus byte order which is little-endian!.

 *

 * readX/writeX() are used to access memory mapped devices. On some

 * architectures the memory mapped IO stuff needs to be accessed

 * differently. On the m68k architecture, we just read/write the

 * memory location directly.

 */

/* ++roman: The assignments to temp. vars avoid that gcc sometimes generates

 * two accesses to memory, which may be undesirable for some devices.

 * The non-MMU m68k and ColdFire IO and memory mapped hardware access

 * functions have always worked in CPU native endian. We need to define

 * that behavior here first before we include asm-generic/io.h.

 */



/*

 * swap functions are sometimes needed to interface little-endian hardware

 */

static inline unsigned short _swapw(volatile unsigned short v)

{

    return ((v << 8) | (v >> 8));

}



static inline unsigned int _swapl(volatile unsigned long v)

{

    return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));

}



#define readb(addr) \

    ({ unsigned char __v = (*(volatile unsigned char *) (addr)); __v; })

#define readw(addr) \
@@ -54,147 +25,7 @@ static inline unsigned int _swapl(volatile unsigned long v) 
#define __raw_writew writew

#define __raw_writel writel



static inline void io_outsb(unsigned int addr, const void *buf, int len)

{

	volatile unsigned char *ap = (volatile unsigned char *) addr;

	unsigned char *bp = (unsigned char *) buf;

	while (len--)

		*ap = *bp++;

}



static inline void io_outsw(unsigned int addr, const void *buf, int len)

{

	volatile unsigned short *ap = (volatile unsigned short *) addr;

	unsigned short *bp = (unsigned short *) buf;

	while (len--)

		*ap = _swapw(*bp++);

}



static inline void io_outsl(unsigned int addr, const void *buf, int len)

{

	volatile unsigned int *ap = (volatile unsigned int *) addr;

	unsigned int *bp = (unsigned int *) buf;

	while (len--)

		*ap = _swapl(*bp++);

}



static inline void io_insb(unsigned int addr, void *buf, int len)

{

	volatile unsigned char *ap = (volatile unsigned char *) addr;

	unsigned char *bp = (unsigned char *) buf;

	while (len--)

		*bp++ = *ap;

}



static inline void io_insw(unsigned int addr, void *buf, int len)

{

	volatile unsigned short *ap = (volatile unsigned short *) addr;

	unsigned short *bp = (unsigned short *) buf;

	while (len--)

		*bp++ = _swapw(*ap);

}



static inline void io_insl(unsigned int addr, void *buf, int len)

{

	volatile unsigned int *ap = (volatile unsigned int *) addr;

	unsigned int *bp = (unsigned int *) buf;

	while (len--)

		*bp++ = _swapl(*ap);

}



#define mmiowb()



/*

 *	make the short names macros so specific devices

 *	can override them as required

 */



#define memset_io(a,b,c)	memset((void *)(a),(b),(c))

#define memcpy_fromio(a,b,c)	memcpy((a),(void *)(b),(c))

#define memcpy_toio(a,b,c)	memcpy((void *)(a),(b),(c))



#define inb(addr)    readb(addr)

#define inw(addr)    readw(addr)

#define inl(addr)    readl(addr)

#define outb(x,addr) ((void) writeb(x,addr))

#define outw(x,addr) ((void) writew(x,addr))

#define outl(x,addr) ((void) writel(x,addr))



#define inb_p(addr)    inb(addr)

#define inw_p(addr)    inw(addr)

#define inl_p(addr)    inl(addr)

#define outb_p(x,addr) outb(x,addr)

#define outw_p(x,addr) outw(x,addr)

#define outl_p(x,addr) outl(x,addr)



#define outsb(a,b,l) io_outsb(a,b,l)

#define outsw(a,b,l) io_outsw(a,b,l)

#define outsl(a,b,l) io_outsl(a,b,l)



#define insb(a,b,l) io_insb(a,b,l)

#define insw(a,b,l) io_insw(a,b,l)

#define insl(a,b,l) io_insl(a,b,l)



#define IO_SPACE_LIMIT 0xffffffff





/* Values for nocacheflag and cmode */

#define IOMAP_FULL_CACHING		0

#define IOMAP_NOCACHE_SER		1

#define IOMAP_NOCACHE_NONSER		2

#define IOMAP_WRITETHROUGH		3



static inline void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)

{

	return (void *) physaddr;

}

static inline void *ioremap(unsigned long physaddr, unsigned long size)

{

	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);

}

static inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)

{

	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);

}

static inline void *ioremap_wt(unsigned long physaddr, unsigned long size)

{

	return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);

}

static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size)

{

	return __ioremap(physaddr, size, IOMAP_FULL_CACHING);

}



#define	iounmap(addr)	do { } while(0)



/*

 * Convert a physical pointer to a virtual kernel pointer for /dev/mem

 * access

 */

#define xlate_dev_mem_ptr(p)	__va(p)



/*

 * Convert a virtual cached pointer to an uncached pointer

 */

#define xlate_dev_kmem_ptr(p)	p



static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)

{

	return (void __iomem *) port;

}



static inline void ioport_unmap(void __iomem *p)

{

}



#endif /* __KERNEL__ */



#define readb_relaxed(addr)	readb(addr)

#define readw_relaxed(addr)	readw(addr)

#define readl_relaxed(addr)	readl(addr)



#define writeb_relaxed(b, addr)	writeb(b, addr)

#define writew_relaxed(b, addr)	writew(b, addr)

#define writel_relaxed(b, addr)	writel(b, addr)

#include <asm/virtconvert.h>

#include <asm-generic/io.h>



#endif /* _M68KNOMMU_IO_H */

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