linux/arch/sh/kernel/io.c
Paul Mundt b66c1a3919 [PATCH] sh: I/O routine cleanups and ioremap() overhaul
This introduces a few changes in the way that the I/O routines are defined on
SH, specifically so that things like the iomap API properly wrap through the
machvec for board-specific quirks.

In addition to this, the old p3_ioremap() work is converted to a more generic
__ioremap() that will map through the PMB if it's available, or fall back on
page tables for everything else.

An alpha-like IO_CONCAT is also added so we can start to clean up the
board-specific io.h mess, which will be handled in board update patches..

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-16 23:15:28 -08:00

75 lines
1.8 KiB
C

/*
* linux/arch/sh/kernel/io.c
*
* Copyright (C) 2000 Stuart Menefy
* Copyright (C) 2005 Paul Mundt
*
* Provide real functions which expand to whatever the header file defined.
* Also definitions of machine independent IO functions.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/module.h>
#include <asm/machvec.h>
#include <asm/io.h>
/*
* Copy data from IO memory space to "real" memory space.
* This needs to be optimized.
*/
void memcpy_fromio(void *to, volatile void __iomem *from, unsigned long count)
{
char *p = to;
while (count) {
count--;
*p = readb((void __iomem *)from);
p++;
from++;
}
}
EXPORT_SYMBOL(memcpy_fromio);
/*
* Copy data from "real" memory space to IO memory space.
* This needs to be optimized.
*/
void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count)
{
const char *p = from;
while (count) {
count--;
writeb(*p, (void __iomem *)to);
p++;
to++;
}
}
EXPORT_SYMBOL(memcpy_toio);
/*
* "memset" on IO memory space.
* This needs to be optimized.
*/
void memset_io(volatile void __iomem *dst, int c, unsigned long count)
{
while (count) {
count--;
writeb(c, (void __iomem *)dst);
dst++;
}
}
EXPORT_SYMBOL(memset_io);
void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
return sh_mv.mv_ioport_map(port, nr);
}
EXPORT_SYMBOL(ioport_map);
void ioport_unmap(void __iomem *addr)
{
sh_mv.mv_ioport_unmap(addr);
}
EXPORT_SYMBOL(ioport_unmap);