From: "Bryan O'Sullivan" <bos@pathscale.com>
To: akpm@osdl.org
Cc: linux-kernel@vger.kernel.org, hch@infradead.org, ak@suse.de
Subject: [PATCH 1 of 3] Introduce __raw_memcpy_toio32
Date: Wed, 11 Jan 2006 14:39:55 -0800 [thread overview]
Message-ID: <05b3d1af27ebbbe6e436.1137019195@eng-12.pathscale.com> (raw)
In-Reply-To: <patchbomb.1137019194@eng-12.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 c90267e4a29b -r 05b3d1af27eb lib/Makefile
--- a/lib/Makefile Wed Jan 11 13:31:24 2006 +0800
+++ b/lib/Makefile Wed Jan 11 14:35:45 2006 -0800
@@ -5,7 +5,7 @@
lib-y := errno.o ctype.o string.o vsprintf.o cmdline.o \
bust_spinlocks.o rbtree.o radix-tree.o dump_stack.o \
idr.o div64.o int_sqrt.o bitmap.o extable.o prio_tree.o \
- sha1.o
+ sha1.o raw_memcpy_io.o
lib-y += kobject.o kref.o kobject_uevent.o klist.o
diff -r c90267e4a29b -r 05b3d1af27eb lib/raw_memcpy_io.c
--- /dev/null Thu Jan 1 00:00:00 1970 +0000
+++ b/lib/raw_memcpy_io.c Wed Jan 11 14:35:45 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.
+ */
+
+#include <linux/module.h>
+#include <asm/io.h>
+
+/**
+ * __raw_memcpy_toio32 - copy data to MMIO space, in 32-bit units
+ * @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
+ *
+ * Copy data from kernel space to MMIO space, in units of 32 bits at a
+ * time. Order of access is not guaranteed, nor is a memory barrier
+ * performed afterwards.
+ */
+void __attribute__((weak)) __raw_memcpy_toio32(void __iomem *to,
+ const void *from, size_t count)
+{
+ u32 __iomem *dst = to;
+ const u32 *src = from;
+ const u32 *end = src + count;
+
+ while (src < end)
+ __raw_writel(*src++, dst++);
+}
+EXPORT_SYMBOL_GPL(__raw_memcpy_toio32);
next prev parent reply other threads:[~2006-01-11 22:41 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-11 22:39 [PATCH 0 of 3] MMIO 32-bit copy routine, the final frontier Bryan O'Sullivan
2006-01-11 22:39 ` Bryan O'Sullivan [this message]
2006-01-11 23:43 ` [PATCH 1 of 3] Introduce __raw_memcpy_toio32 Andrew Morton
2006-01-11 22:39 ` [PATCH 2 of 3] memcpy32 for x86_64 Bryan O'Sullivan
2006-01-11 23:45 ` Roland Dreier
2006-01-12 0:03 ` Bryan O'Sullivan
2006-01-11 22:39 ` [PATCH 3 of 3] Add __raw_memcpy_toio32 to each arch Bryan O'Sullivan
2006-01-11 23:46 ` Andrew Morton
2006-01-12 0:05 ` Bryan O'Sullivan
2006-01-12 0:13 ` Andrew Morton
2006-01-12 0:21 ` Bryan O'Sullivan
[not found] <5s6p8-1O3-29@gated-at.bofh.it>
[not found] ` <5s6p8-1O3-27@gated-at.bofh.it>
[not found] ` <5tnZx-1lb-17@gated-at.bofh.it>
[not found] ` <5tt8U-xV-5@gated-at.bofh.it>
[not found] ` <5tueu-2mb-9@gated-at.bofh.it>
[not found] ` <5tvaH-3MA-55@gated-at.bofh.it>
[not found] ` <5tvX6-4MO-13@gated-at.bofh.it>
[not found] ` <5tvX6-4MO-11@gated-at.bofh.it>
[not found] ` <5tvXa-4MO-23@gated-at.bofh.it>
[not found] ` <5tzQR-2zH-11@gated-at.bofh.it>
2006-01-15 15:33 ` [PATCH 1 of 3] Introduce __raw_memcpy_toio32 Bodo Eggert
-- strict thread matches above, loose matches on Subject: below --
2006-01-10 19:53 [PATCH 0 of 3] 32-bit MMIO copy routines, reworked Bryan O'Sullivan
2006-01-10 19:53 ` [PATCH 1 of 3] Introduce __raw_memcpy_toio32 Bryan O'Sullivan
2006-01-06 20:26 [PATCH 0 of 3] 32-bit MMIO copy routine Bryan O'Sullivan
2006-01-06 20:26 ` [PATCH 1 of 3] Introduce __raw_memcpy_toio32 Bryan O'Sullivan
2006-01-10 9:18 ` Andrew Morton
2006-01-10 14:55 ` Roland Dreier
2006-01-10 16:07 ` Bryan O'Sullivan
2006-01-10 17:07 ` Christoph Hellwig
2006-01-10 17:13 ` Bryan O'Sullivan
2006-01-10 17:49 ` Bryan O'Sullivan
2006-01-10 17:51 ` Christoph Hellwig
2006-01-10 17:55 ` Bryan O'Sullivan
2006-01-10 22:05 ` Andrew Morton
2006-01-10 22:29 ` Bryan O'Sullivan
2006-01-10 23:32 ` Andrew Morton
2006-01-11 17:20 ` Bryan O'Sullivan
2006-01-11 17:22 ` Sam Ravnborg
2006-01-11 17:30 ` Andrew Morton
2006-01-11 17:43 ` Bryan O'Sullivan
2006-01-11 18:49 ` Roland Dreier
2006-01-11 18:57 ` Bryan O'Sullivan
2006-01-11 19:01 ` Roland Dreier
2006-01-11 19:08 ` Bryan O'Sullivan
2006-01-13 15:19 ` Adrian Bunk
2006-01-10 18:02 ` Randy.Dunlap
2006-01-10 20:04 ` Sam Ravnborg
2006-01-10 15:59 ` Bryan O'Sullivan
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