[PATCH 1 of 3] Introduce __raw_memcpy_toio32

["Bryan O'Sullivan" <bos@pathscale.com>]

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 ddf8ff83e4ac -r d286502c3b3c include/asm-generic/raw_memcpy_toio32.h
--- /dev/null	Thu Jan  1 00:00:00 1970 +0000
+++ b/include/asm-generic/raw_memcpy_toio32.h	Fri Jan  6 12:25:00 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.
+ */
+#ifndef _ASM_GENERIC_RAW_MEMCPYTOIO32_H
+#define _ASM_GENERIC_RAW_MEMCPYTOIO32_H
+
+/*
+ * __raw_memcpy_toio32 - copy data to MMIO space, in 32-bit units
+ *
+ * Order of access is not guaranteed, nor is a memory barrier performed
+ * afterwards.  This is an arch-independent generic implementation.
+ *
+ * @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
+ */
+static inline void __raw_memcpy_toio32(void __iomem *to, const void *from,
+				       size_t count)
+{
+	u32 __iomem *dst = d;
+	const u32 *src = s;
+	size_t i;
+
+	for (i = 0; i < count; i++)
+		__raw_writel(*src++, dst++);
+}
+
+#endif // _ASM_GENERIC_RAW_MEMCPYTOIO32_H