From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751426AbWALRHm (ORCPT ); Thu, 12 Jan 2006 12:07:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751412AbWALRHR (ORCPT ); Thu, 12 Jan 2006 12:07:17 -0500 Received: from mx.pathscale.com ([64.160.42.68]:42431 "EHLO mx.pathscale.com") by vger.kernel.org with ESMTP id S1751223AbWALRHN (ORCPT ); Thu, 12 Jan 2006 12:07:13 -0500 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [PATCH 1 of 2] Introduce __iowrite32_copy X-Mercurial-Node: ec2b3675168a90ce4f12fdf689d7668e93a2b493 Message-Id: In-Reply-To: Date: Thu, 12 Jan 2006 09:05:31 -0800 From: "Bryan O'Sullivan" To: akpm@osdl.org, ak@suse.de Cc: linux-kernel@vger.kernel.org, hch@infradead.org, rdreier@cisco.com Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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 diff -r c90267e4a29b -r ec2b3675168a lib/Makefile --- a/lib/Makefile Wed Jan 11 13:31:24 2006 +0800 +++ b/lib/Makefile Thu Jan 12 09:03:37 2006 -0800 @@ -9,7 +9,7 @@ lib-y += kobject.o kref.o kobject_uevent.o klist.o -obj-y += sort.o parser.o halfmd4.o +obj-y += sort.o parser.o halfmd4.o iomap_copy.o ifeq ($(CONFIG_DEBUG_KOBJECT),y) CFLAGS_kobject.o += -DDEBUG diff -r c90267e4a29b -r ec2b3675168a include/linux/io.h --- /dev/null Thu Jan 1 00:00:00 1970 +0000 +++ b/include/linux/io.h Thu Jan 12 09:03:37 2006 -0800 @@ -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 + +void __iowrite32_copy(void __iomem *to, const void *from, size_t count); + +#endif /* _LINUX_IO_H */ diff -r c90267e4a29b -r ec2b3675168a lib/iomap_copy.c --- /dev/null Thu Jan 1 00:00:00 1970 +0000 +++ b/lib/iomap_copy.c Thu Jan 12 09:03:37 2006 -0800 @@ -0,0 +1,42 @@ +/* + * 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 + +/** + * __iowrite32_copy - 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)) __iowrite32_copy(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(__iowrite32_copy);