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authorBryan O'Sullivan <bos@pathscale.com>2006-02-01 03:05:16 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-01 08:53:13 -0800
commitc27a0d75b33c030965cc97d3d7f571107a673fb4 (patch)
treec4d797b413bb6f8a1b8507213294a291ab5114f8 /include
parentf7589f28d7dd4586b4e90ac3b2a180409669053a (diff)
[PATCH] Introduce __iowrite32_copy
This arch-independent routine copies data to a memory-mapped I/O region, using 32-bit accesses. The naming is double-underscored to make it clear that it does not guarantee write ordering, nor does it perform a memory barrier afterwards; the kernel doc also explicitly states this. This style of access is required by some devices. This change also introduces include/linux/io.h, at Andrew's suggestion. It only has one occupant at the moment, but is a logical destination for oft-replicated contents of include/asm-*/{io,iomap}.h to migrate to. Signed-off-by: Bryan O'Sullivan <bos@pathscale.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/io.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/io.h b/include/linux/io.h
new file mode 100644
index 000000000000..85533ec5aaa1
--- /dev/null
+++ b/include/linux/io.h
@@ -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 __iowrite32_copy(void __iomem *to, const void *from, size_t count);
+
+#endif /* _LINUX_IO_H */