mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 16:54:20 +08:00
a9aec5881b
Some drivers need to read data out of iomem areas 32-bits at a time. Add an API to do this. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Cc: Bjorn Andersson <bjorn.andersson@sonymobile.com> Cc: <zajec5@gmail.com> Cc: David Howells <dhowells@redhat.com> Cc: Hauke Mehrtens <hauke@hauke-m.de> Cc: Paul Walmsley <paul@pwsan.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
|
|
* Copyright 2006 PathScale, Inc. All Rights Reserved.
|
|
*
|
|
* 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>
|
|
|
|
/**
|
|
* __iowrite32_copy - copy data to MMIO space, in 32-bit units
|
|
* @to: destination, in MMIO space (must be 32-bit aligned)
|
|
* @from: source (must be 32-bit aligned)
|
|
* @count: number of 32-bit quantities to copy
|
|
*
|
|
* Copy data from kernel space to MMIO space, in units of 32 bits at a
|
|
* time. Order of access is not guaranteed, nor is a memory barrier
|
|
* performed afterwards.
|
|
*/
|
|
void __attribute__((weak)) __iowrite32_copy(void __iomem *to,
|
|
const void *from,
|
|
size_t count)
|
|
{
|
|
u32 __iomem *dst = to;
|
|
const u32 *src = from;
|
|
const u32 *end = src + count;
|
|
|
|
while (src < end)
|
|
__raw_writel(*src++, dst++);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__iowrite32_copy);
|
|
|
|
/**
|
|
* __ioread32_copy - copy data from MMIO space, in 32-bit units
|
|
* @to: destination (must be 32-bit aligned)
|
|
* @from: source, in MMIO space (must be 32-bit aligned)
|
|
* @count: number of 32-bit quantities to copy
|
|
*
|
|
* Copy data from MMIO space to kernel space, in units of 32 bits at a
|
|
* time. Order of access is not guaranteed, nor is a memory barrier
|
|
* performed afterwards.
|
|
*/
|
|
void __ioread32_copy(void *to, const void __iomem *from, size_t count)
|
|
{
|
|
u32 *dst = to;
|
|
const u32 __iomem *src = from;
|
|
const u32 __iomem *end = src + count;
|
|
|
|
while (src < end)
|
|
*dst++ = __raw_readl(src++);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__ioread32_copy);
|
|
|
|
/**
|
|
* __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
|
|
* @to: destination, in MMIO space (must be 64-bit aligned)
|
|
* @from: source (must be 64-bit aligned)
|
|
* @count: number of 64-bit quantities to copy
|
|
*
|
|
* Copy data from kernel space to MMIO 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 __attribute__((weak)) __iowrite64_copy(void __iomem *to,
|
|
const void *from,
|
|
size_t count)
|
|
{
|
|
#ifdef CONFIG_64BIT
|
|
u64 __iomem *dst = to;
|
|
const u64 *src = from;
|
|
const u64 *end = src + count;
|
|
|
|
while (src < end)
|
|
__raw_writeq(*src++, dst++);
|
|
#else
|
|
__iowrite32_copy(to, from, count * 2);
|
|
#endif
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(__iowrite64_copy);
|