Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932472AbWAKWlz (ORCPT ); Wed, 11 Jan 2006 17:41:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932479AbWAKWlc (ORCPT ); Wed, 11 Jan 2006 17:41:32 -0500 Received: from mx.pathscale.com ([64.160.42.68]:18124 "EHLO mx.pathscale.com") by vger.kernel.org with ESMTP id S932472AbWAKWl1 (ORCPT ); Wed, 11 Jan 2006 17:41:27 -0500 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [PATCH 1 of 3] Introduce __raw_memcpy_toio32 X-Mercurial-Node: 05b3d1af27ebbbe6e436a06b3d233dff6a2b60dd Message-Id: <05b3d1af27ebbbe6e436.1137019195@eng-12.pathscale.com> In-Reply-To: Date: Wed, 11 Jan 2006 14:39:55 -0800 From: "Bryan O'Sullivan" To: akpm@osdl.org Cc: linux-kernel@vger.kernel.org, hch@infradead.org, ak@suse.de Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2622 Lines: 69 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 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 +#include + +/** + * __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); - 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/