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authorGreg Ungerer <gerg@linux-m68k.org>2018-03-23 23:39:10 +1000
committerGreg Ungerer <gerg@linux-m68k.org>2018-05-28 09:45:25 +1000
commitd97cf70af09721ef416c61faa44543e3b84c9a55 (patch)
treee3b17e9594e9dc808552d9a18106b169ddcd200b /arch/m68k/include
parentf8f3304856cdf67414ba2c1a3d2adf78974a3d6a (diff)
downloadlinux-d97cf70af09721ef416c61faa44543e3b84c9a55.tar.bz2
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: Greg Ungerer <gerg@linux-m68k.org> Reviewed-by: Angelo Dureghello <angelo@sysam.it> Tested-by: Angelo Dureghello <angelo@sysam.it>
Diffstat (limited to 'arch/m68k/include')
-rw-r--r--arch/m68k/include/asm/io_no.h179
1 files changed, 5 insertions, 174 deletions
diff --git a/arch/m68k/include/asm/io_no.h b/arch/m68k/include/asm/io_no.h
index ffe567e79082..acd049824dec 100644
--- a/arch/m68k/include/asm/io_no.h
+++ b/arch/m68k/include/asm/io_no.h
@@ -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 */