mirror of
https://github.com/torvalds/linux.git
synced 2024-12-03 17:41:22 +00:00
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>
43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/*
|
|
* 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);
|