On Tue, 4 Oct 2011, Tony Lindgren wrote:
> This allows mapping external memory such as SRAM for use.
>
> This is needed for some small chunks of code, such as reprogramming
> SDRAM memory source clocks that can't be executed in SDRAM. Other
> use cases include some PM related code.
>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Acked-by: Nicolas Pitre <nicolas.pitre@xxxxxxxxxx>
As mentioned, you might consider dropping the export until needed.
> ---
> arch/arm/include/asm/io.h | 1 +
> arch/arm/mm/ioremap.c | 22 ++++++++++++++++++++++
> 2 files changed, 23 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
> index d66605d..4ff152e 100644
> --- a/arch/arm/include/asm/io.h
> +++ b/arch/arm/include/asm/io.h
> @@ -80,6 +80,7 @@ extern void __iomem *__arm_ioremap_caller(unsigned long, size_t, unsigned int,
>
> extern void __iomem *__arm_ioremap_pfn(unsigned long, unsigned long, size_t, unsigned int);
> extern void __iomem *__arm_ioremap(unsigned long, size_t, unsigned int);
> +extern void __iomem *__arm_ioremap_exec(unsigned long, size_t, int cached);
> extern void __iounmap(volatile void __iomem *addr);
>
> /*
> diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
> index ab50627..a813658 100644
> --- a/arch/arm/mm/ioremap.c
> +++ b/arch/arm/mm/ioremap.c
> @@ -289,6 +289,28 @@ __arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
> }
> EXPORT_SYMBOL(__arm_ioremap);
>
> +/*
> + * Remap an arbitrary physical address space into the kernel virtual
> + * address space as memory. Needed when the kernel wants to execute
> + * code in external memory. This is needed for reprogramming source
> + * clocks that would affect normal memory for example. Please see
> + * CONFIG_GENERIC_ALLOCATOR for allocating external memory.
> + */
> +void __iomem *
> +__arm_ioremap_exec(unsigned long phys_addr, size_t size, int cached)
> +{
> + unsigned int mtype;
> +
> + if (cached)
> + mtype = MT_MEMORY;
> + else
> + mtype = MT_MEMORY_NONCACHED;
> +
> + return __arm_ioremap_caller(phys_addr, size, mtype,
> + __builtin_return_address(0));
> +}
> +EXPORT_SYMBOL(__arm_ioremap_exec);
> +
> void __iounmap(volatile void __iomem *io_addr)
> {
> void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
>
>
> _______________________________________________
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> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
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