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d97cf70af0
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: Greg Ungerer <gerg@linux-m68k.org> Reviewed-by: Angelo Dureghello <angelo@sysam.it> Tested-by: Angelo Dureghello <angelo@sysam.it>
32 lines
1.0 KiB
C
32 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _M68KNOMMU_IO_H
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#define _M68KNOMMU_IO_H
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/*
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* The non-MMU m68k and ColdFire IO and memory mapped hardware access
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* functions have always worked in CPU native endian. We need to define
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* that behavior here first before we include asm-generic/io.h.
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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) (void)((*(volatile unsigned char *) (addr)) = (b))
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#define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b))
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#define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b))
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#define __raw_readb readb
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#define __raw_readw readw
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#define __raw_readl readl
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#define __raw_writeb writeb
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#define __raw_writew writew
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#define __raw_writel writel
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#include <asm/virtconvert.h>
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#include <asm-generic/io.h>
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#endif /* _M68KNOMMU_IO_H */
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