[PATCH] import linux __iowrite32/64_copy support

[Sascha Hauer]

Hi J,

On Thu, Jun 02, 2011 at 05:51:27PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
> ---
>  include/linux/io.h |   27 ++++++++++++++++++++
>  lib/Makefile       |    1 +
>  lib/iomap_copy.c   |   70 ++++++++++++++++++++++++++++++++++++++++++++++++++++

No general obejctions, but without users this is quite uninteresting.
Please repost this along with the first user.

Sascha

>  3 files changed, 98 insertions(+), 0 deletions(-)
>  create mode 100644 include/linux/io.h
>  create mode 100644 lib/iomap_copy.c
> 
> diff --git a/include/linux/io.h b/include/linux/io.h
> new file mode 100644
> index 0000000..a87501c
> --- /dev/null
> +++ b/include/linux/io.h
> @@ -0,0 +1,27 @@
> +/*
> + * 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.
> + */
> +
> +#ifndef _LINUX_IO_H
> +#define _LINUX_IO_H
> +
> +#include <linux/types.h>
> +#include <asm/io.h>
> +
> +void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
> +void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
> +
> +#endif /* _LINUX_IO_H */
> diff --git a/lib/Makefile b/lib/Makefile
> index d96cfe7..b1f4f3d 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -1,4 +1,5 @@
>  obj-y			+= ctype.o
> +obj-y			+= iomap_copy.o
>  obj-y			+= rbtree.o
>  obj-y			+= display_options.o
>  obj-y			+= string.o
> diff --git a/lib/iomap_copy.c b/lib/iomap_copy.c
> new file mode 100644
> index 0000000..8732ae0
> --- /dev/null
> +++ b/lib/iomap_copy.c
> @@ -0,0 +1,70 @@
> +/*
> + * 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 <module.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);
> +
> +/**
> + * __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);
> -- 
> 1.7.4.1
> 
> 
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