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d8c825e2a0
We currently have __ioread32_copy, __iowrite32_copy & __iowrite64_copy helpers in lib/iomap_copy.c. This patch adds __ioread64_copy to round out the set, allowing copies from I/O memory using 32 or 64 bit reads. [ralf@linux-mips.org: Changed to move all the code of this patch to be applied to arch/mips temporarily.] Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/17025/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
/*
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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/export.h>
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#include <linux/io.h>
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/**
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* __ioread64_copy - copy data from MMIO space, in 64-bit units
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* @to: destination (must be 64-bit aligned)
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* @from: source, in MMIO space (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 MMIO space to kernel 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 __ioread64_copy(void *to, const void __iomem *from, size_t count)
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{
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#ifdef CONFIG_64BIT
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u64 *dst = to;
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const u64 __iomem *src = from;
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const u64 __iomem *end = src + count;
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while (src < end)
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*dst++ = __raw_readq(src++);
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#else
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__ioread32_copy(to, from, count * 2);
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#endif
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}
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EXPORT_SYMBOL_GPL(__ioread64_copy);
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