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    Subject[PATCH 1 of 2] Introduce __raw_memcpy_toio32
    Date
    From
    This arch-independent routine copies data to a memory-mapped I/O region,
    using 32-bit accesses. It does not guarantee access ordering, nor does
    it perform a memory barrier afterwards. This style of access is required
    by some devices.

    Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>

    diff -r c90267e4a29b -r cd6d8a62dad5 lib/Makefile
    --- a/lib/Makefile Wed Jan 11 13:31:24 2006 +0800
    +++ b/lib/Makefile Wed Jan 11 16:25:30 2006 -0800
    @@ -9,7 +9,7 @@

    lib-y += kobject.o kref.o kobject_uevent.o klist.o

    -obj-y += sort.o parser.o halfmd4.o
    +obj-y += sort.o parser.o halfmd4.o raw_memcpy_io.o

    ifeq ($(CONFIG_DEBUG_KOBJECT),y)
    CFLAGS_kobject.o += -DDEBUG
    diff -r c90267e4a29b -r cd6d8a62dad5 include/linux/io.h
    --- /dev/null Thu Jan 1 00:00:00 1970 +0000
    +++ b/include/linux/io.h Wed Jan 11 16:25:30 2006 -0800
    @@ -0,0 +1,25 @@
    +/*
    + * Copyright 2006 PathScale, Inc. All Rights Reserved.
    + *
    + * This file is free software; you can redistribute it and/or modify
    + * it under the terms of version 2 of the GNU General Public License
    + * as published by the Free Software Foundation.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software Foundation,
    + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
    + */
    +
    +#ifndef _LINUX_IO_H
    +#define _LINUX_IO_H
    +
    +#include <asm/io.h>
    +
    +void __raw_memcpy_toio32(void __iomem *to, const void *from, size_t count);
    +
    +#endif /* _LINUX_IO_H */
    diff -r c90267e4a29b -r cd6d8a62dad5 lib/raw_memcpy_io.c
    --- /dev/null Thu Jan 1 00:00:00 1970 +0000
    +++ b/lib/raw_memcpy_io.c Wed Jan 11 16:25:30 2006 -0800
    @@ -0,0 +1,41 @@
    +/*
    + * Copyright 2006 PathScale, Inc. All Rights Reserved.
    + *
    + * This file is free software; you can redistribute it and/or modify
    + * it under the terms of version 2 of the GNU General Public License
    + * as published by the Free Software Foundation.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software Foundation,
    + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
    + */
    +
    +#include <linux/io.h>
    +#include <linux/module.h>
    +
    +/**
    + * __raw_memcpy_toio32 - copy data to MMIO space, in 32-bit units
    + * @to: destination, in MMIO space (must be 32-bit aligned)
    + * @from: source (must be 32-bit aligned)
    + * @count: number of 32-bit quantities to copy
    + *
    + * Copy data from kernel space to MMIO space, in units of 32 bits at a
    + * time. Order of access is not guaranteed, nor is a memory barrier
    + * performed afterwards.
    + */
    +void __attribute__((weak)) __raw_memcpy_toio32(void __iomem *to,
    + const void *from, size_t count)
    +{
    + u32 __iomem *dst = to;
    + const u32 *src = from;
    + const u32 *end = src + count;
    +
    + while (src < end)
    + __raw_writel(*src++, dst++);
    +}
    +EXPORT_SYMBOL_GPL(__raw_memcpy_toio32);
    -
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