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 <[email protected]>
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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