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MIPS: Add __ioread64_copy

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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>
This commit is contained in:
Paul Burton 2017-08-12 21:36:15 -07:00 committed by Ralf Baechle
parent 9762d2e6d3
commit d8c825e2a0
3 changed files with 45 additions and 1 deletions
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2
arch/mips/include/asm/io.h
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@ -632,4 +632,6 @@ extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
*/
#define xlate_dev_kmem_ptr(p) p
void __ioread64_copy(void *to, const void __iomem *from, size_t count);
#endif /* _ASM_IO_H */

2
arch/mips/lib/Makefile
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@ -6,7 +6,7 @@ lib-y += bitops.o csum_partial.o delay.o memcpy.o memset.o \
mips-atomic.o strncpy_user.o \
strnlen_user.o uncached.o
obj-y += iomap.o
obj-y += iomap.o iomap_copy.o
obj-$(CONFIG_PCI) += iomap-pci.o
lib-$(CONFIG_GENERIC_CSUM) := $(filter-out csum_partial.o, $(lib-y))

42
arch/mips/lib/iomap_copy.c Normal file
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@ -0,0 +1,42 @@
/*
* 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 <linux/export.h>
#include <linux/io.h>
/**
* __ioread64_copy - copy data from MMIO space, in 64-bit units
* @to: destination (must be 64-bit aligned)
* @from: source, in MMIO space (must be 64-bit aligned)
* @count: number of 64-bit quantities to copy
*
* Copy data from MMIO space to kernel space, in units of 32 or 64 bits at a
* time. Order of access is not guaranteed, nor is a memory barrier
* performed afterwards.
*/
void __ioread64_copy(void *to, const void __iomem *from, size_t count)
{
#ifdef CONFIG_64BIT
u64 *dst = to;
const u64 __iomem *src = from;
const u64 __iomem *end = src + count;
while (src < end)
*dst++ = __raw_readq(src++);
#else
__ioread32_copy(to, from, count * 2);
#endif
}
EXPORT_SYMBOL_GPL(__ioread64_copy);