Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932547AbWAJTzo (ORCPT ); Tue, 10 Jan 2006 14:55:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932550AbWAJTzn (ORCPT ); Tue, 10 Jan 2006 14:55:43 -0500 Received: from mx.pathscale.com ([64.160.42.68]:57002 "EHLO mx.pathscale.com") by vger.kernel.org with ESMTP id S932547AbWAJTzm (ORCPT ); Tue, 10 Jan 2006 14:55:42 -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: 2d4af213d9c5975d28fc11c472f3b5e1cf2c21cd Message-Id: <2d4af213d9c5975d28fc.1136922837@serpentine.internal.keyresearch.com> In-Reply-To: Date: Tue, 10 Jan 2006 11:53:57 -0800 From: "Bryan O'Sullivan" To: akpm@osdl.org Cc: linux-kernel@vger.kernel.org, hch@infradead.org, ak@suse.de, rdreier@cisco.com Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2586 Lines: 66 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 48616306e7bd -r 2d4af213d9c5 lib/Makefile --- a/lib/Makefile Tue Jan 10 10:41:42 2006 +0800 +++ b/lib/Makefile Tue Jan 10 11:52:46 2006 -0800 @@ -21,6 +21,7 @@ lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o lib-$(CONFIG_SEMAPHORE_SLEEPERS) += semaphore-sleepers.o lib-$(CONFIG_GENERIC_FIND_NEXT_BIT) += find_next_bit.o +lib-$(CONFIG_GENERIC_RAW_MEMCPY_IO) += raw_memcpy_io.o obj-$(CONFIG_LOCK_KERNEL) += kernel_lock.o obj-$(CONFIG_DEBUG_PREEMPT) += smp_processor_id.o diff -r 48616306e7bd -r 2d4af213d9c5 lib/raw_memcpy_io.c --- /dev/null Thu Jan 1 00:00:00 1970 +0000 +++ b/lib/raw_memcpy_io.c Tue Jan 10 11:52:46 2006 -0800 @@ -0,0 +1,39 @@ +/* + * 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 __raw_memcpy_toio32(void __iomem *to, const void *from, size_t count) +{ + u32 __iomem *dst = to; + const u32 *src = from; + size_t i; + + for (i = 0; i < count; i++) + __raw_writel(*src++, dst++); +} - 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/