Messages in this thread Patch in this message | | | Subject | [PATCH 1 of 3] Introduce __memcpy_toio32 | Date | Tue, 27 Dec 2005 15:41:55 -0800 | From | Bryan O'Sullivan <> |
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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) { - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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