[U-Boot] [PATCH v4 2/8] mips: implement to access the KSEG0/1 memory range in map_physmem

[Marek Vasut]

On Friday, December 25, 2015 at 07:56:22 PM, Wills Wang wrote:
> U-boot just use the no MMU virtual address segment(KSEG0/1), this
> patch enable access the uncached memory range(KSEG1) by flag
> "MAP_NOCACHE", other flag for KSEG0 access.
> 
> Signed-off-by: Wills Wang <wills.wang at live.com>
> ---
> 
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
> 
>  arch/mips/include/asm/io.h | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
> index a7ab087..943053d 100644
> --- a/arch/mips/include/asm/io.h
> +++ b/arch/mips/include/asm/io.h
> @@ -485,7 +485,7 @@ static inline void sync(void)
>   * that can be used to access the memory range with the caching
>   * properties specified by "flags".
>   */
> -#define MAP_NOCACHE	(0)
> +#define MAP_NOCACHE	(1)

I _think_ this is something someone familiar with mips has to review,
since I think this has a potential to break a lot of machines.

>  #define MAP_WRCOMBINE	(0)
>  #define MAP_WRBACK	(0)
>  #define MAP_WRTHROUGH	(0)
> @@ -493,7 +493,10 @@ static inline void sync(void)
>  static inline void *
>  map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
>  {
> -	return (void *)paddr;
> +	if (flags)
> +		return (void *)KSEG1ADDR(paddr);
> +	else
> +		return (void *)KSEG0ADDR(paddr);
>  }
> 
>  /*

Best regards,
Marek Vasut