[U-Boot] [PATCH 1/9] ARM926EJS: Implement cache operations

[Stefano Babic]

On 16/03/2012 05:33, Marek Vasut wrote:
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Stefano Babic <sbabic at denx.de>
> ---
>  arch/arm/cpu/arm926ejs/cache.c |   66 ++++++++++++++++++++++++++++++++-------
>  1 files changed, 54 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm/cpu/arm926ejs/cache.c b/arch/arm/cpu/arm926ejs/cache.c
> index 504f604..5b23e3a 100644
> --- a/arch/arm/cpu/arm926ejs/cache.c
> +++ b/arch/arm/cpu/arm926ejs/cache.c
> @@ -23,29 +23,71 @@
>  #include <common.h>
>  
>  #ifndef CONFIG_SYS_DCACHE_OFF
> -static inline void dcache_noop(void)
> +
> +#ifndef CONFIG_SYS_CACHELINE_SIZE
> +#define CONFIG_SYS_CACHELINE_SIZE	32
> +#endif
> +
> +void invalidate_dcache_all(void)
>  {
> -	if (dcache_status()) {
> -		puts("WARNING: cache operations are not implemented!\n"
> -		     "WARNING: disabling D-Cache now, you can re-enable it"
> -		     "later with 'dcache on' command\n");
> -		dcache_disable();
> -	}
> +	asm volatile("mcr p15, 0, %0, c7, c6, 0\n"::"r"(0));
>  }
>  
> -void invalidate_dcache_all(void)
> +void flush_dcache_all(void)
>  {
> -	dcache_noop();
> +	asm volatile(
> +		"0:"
> +		"mrc p15, 0, r15, c7, c14, 3\n"
> +		"bne 0b\n"
> +		"mcr p15, 0, %0, c7, c10, 4\n"
> +		::"r"(0):"memory"
> +	);
> +}
> +
> +static int check_cache_range(unsigned long start, unsigned long stop)
> +{
> +	int ok = 1;
> +
> +	if (start & (CONFIG_SYS_CACHELINE_SIZE - 1))
> +		ok = 0;
> +
> +	if (stop & (CONFIG_SYS_CACHELINE_SIZE - 1))
> +		ok = 0;
> +
> +	if (!ok)
> +		printf("CACHE: Misaligned operation at range [%08lx, %08lx]\n",
> +			start, stop);
> +
> +	return ok;
>  }
>  
>  void invalidate_dcache_range(unsigned long start, unsigned long stop)
>  {
> -	dcache_noop();
> +	if (!check_cache_range(start, stop))
> +		return;
> +
> +	while (start < stop) {
> +		asm volatile("mcr p15, 0, %0, c7, c6, 1\n"::"r"(start));
> +		start += CONFIG_SYS_CACHELINE_SIZE;
> +	}
>  }
>  
>  void flush_dcache_range(unsigned long start, unsigned long stop)
>  {
> -	dcache_noop();
> +	if (!check_cache_range(start, stop))
> +		return;
> +
> +	while (start < stop) {
> +		asm volatile("mcr p15, 0, %0, c7, c14, 1\n"::"r"(start));
> +		start += CONFIG_SYS_CACHELINE_SIZE;
> +	}
> +
> +	asm("mcr p15, 0, %0, c7, c10, 4\n"::"r"(0));
> +}
> +
> +void flush_cache(unsigned long start, unsigned long size)
> +{
> +	flush_dcache_range(start, start + size);
>  }
>  #else /* #ifndef CONFIG_SYS_DCACHE_OFF */
>  void invalidate_dcache_all(void)
> @@ -64,7 +106,7 @@ void flush_dcache_range(unsigned long start, unsigned long stop)
>  {
>  }
>  
> -void  flush_cache(unsigned long start, unsigned long size)
> +void flush_cache(unsigned long start, unsigned long size)
>  {
>  }
>  #endif /* #ifndef CONFIG_SYS_DCACHE_OFF */

Acked-by: Stefano Babic <sbabic at denx.de>

Best regards,
Stefano Babic

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