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    Subject[PATCH 1 of 3] Introduce __memcpy_toio32
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    This routine is an arch-independent building block for memcpy_toio32.
    It copies data to a memory-mapped I/O region, using 32-bit accesses.
    This style of access is required by some devices.

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

    diff -r 789a24638663 -r 7b7b442a4d63 include/asm-generic/iomap.h
    --- a/include/asm-generic/iomap.h Tue Dec 27 09:27:10 2005 +0800
    +++ b/include/asm-generic/iomap.h Tue Dec 27 15:41:48 2005 -0800
    @@ -56,6 +56,12 @@
    extern void fastcall iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
    extern void fastcall iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);

    +/*
    + * MMIO copy routines. These are guaranteed to operate in units denoted
    + * by their names. This style of operation is required by some devices.
    + */
    +extern void fastcall __memcpy_toio32(volatile void __iomem *to, const void *from, size_t count);
    +
    /* Create a virtual mapping cookie for an IO port range */
    extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
    extern void ioport_unmap(void __iomem *);
    diff -r 789a24638663 -r 7b7b442a4d63 lib/iomap.c
    --- a/lib/iomap.c Tue Dec 27 09:27:10 2005 +0800
    +++ b/lib/iomap.c Tue Dec 27 15:41:48 2005 -0800
    @@ -187,6 +187,22 @@
    EXPORT_SYMBOL(iowrite16_rep);
    EXPORT_SYMBOL(iowrite32_rep);

    +/*
    + * Copy data to an MMIO region. MMIO space accesses are performed
    + * in the sizes indicated in each function's name.
    + */
    +void fastcall __memcpy_toio32(volatile void __iomem *d, const void *s, size_t count)
    +{
    + volatile u32 __iomem *dst = d;
    + const u32 *src = s;
    +
    + while (--count >= 0) {
    + __raw_writel(*src++, dst++);
    + }
    +}
    +
    +EXPORT_SYMBOL_GPL(__memcpy_toio32);
    +
    /* Create a virtual mapping cookie for an IO port range */
    void __iomem *ioport_map(unsigned long port, unsigned int nr)
    {
    -
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