Commit d8c825e2 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
Browse files

MIPS: Add __ioread64_copy 



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: default avatarPaul 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: default avatarRalf Baechle <ralf@linux-mips.org>
parent 9762d2e6

arch/mips/include/asm/io.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */

arch/mips/lib/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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))

arch/mips/lib/iomap_copy.c

0 → 100644
+42 −0
Original line number Diff line number Diff line 
/*

 * 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);

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