22ae813b85
Introduce __iowrite64_copy. It will be used by the Myri-10G Ethernet driver to post requests to the NIC. This driver will be submitted soon. __iowrite64_copy copies to I/O memory in units of 64 bits when possible (on 64 bit architectures). It reverts to __iowrite32_copy on 32 bit architectures. Signed-off-by: Brice Goglin <brice@myri.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/*
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* Copyright 2006 PathScale, Inc. All Rights Reserved.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/module.h>
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#include <linux/io.h>
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/**
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* __iowrite32_copy - copy data to MMIO space, in 32-bit units
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* @to: destination, in MMIO space (must be 32-bit aligned)
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* @from: source (must be 32-bit aligned)
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* @count: number of 32-bit quantities to copy
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*
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* Copy data from kernel space to MMIO space, in units of 32 bits at a
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* time. Order of access is not guaranteed, nor is a memory barrier
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* performed afterwards.
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*/
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void __attribute__((weak)) __iowrite32_copy(void __iomem *to,
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const void *from,
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size_t count)
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{
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u32 __iomem *dst = to;
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const u32 *src = from;
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const u32 *end = src + count;
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while (src < end)
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__raw_writel(*src++, dst++);
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}
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EXPORT_SYMBOL_GPL(__iowrite32_copy);
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/**
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* __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
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* @to: destination, in MMIO space (must be 64-bit aligned)
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* @from: source (must be 64-bit aligned)
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* @count: number of 64-bit quantities to copy
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*
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* Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a
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* time. Order of access is not guaranteed, nor is a memory barrier
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* performed afterwards.
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*/
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void __attribute__((weak)) __iowrite64_copy(void __iomem *to,
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const void *from,
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size_t count)
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{
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#ifdef CONFIG_64BIT
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u64 __iomem *dst = to;
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const u64 *src = from;
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const u64 *end = src + count;
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while (src < end)
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__raw_writeq(*src++, dst++);
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#else
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__iowrite32_copy(to, from, count * 2);
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#endif
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}
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EXPORT_SYMBOL_GPL(__iowrite64_copy);
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