Am 07.08.2016 um 19:17 schrieb Stefan Agner:
> From: Stefan Agner <stefan.ag...@toradex.com>
>
> The page table is maintained by the CPU, hence it is safe to always
> align cache flush to a whole cache line size. This allows to use
> mmu_page_table_flush for a single page table, e.g. when configure
> only small regions through mmu_set_region_dcache_behaviour.
>
> Signed-off-by: Stefan Agner <stefan.ag...@toradex.com>
> Tested-by: Fabio Estevam <fabio.este...@nxp.com>
> Reviewed-by: Simon Glass <s...@chromium.org>
> ---
> Changes since v2:
> - Fixed spelling misstake
> Changes since v1:
> - Move cache line alignment from mmu_page_table_flush to
> mmu_set_region_dcache_behaviour
>
> arch/arm/lib/cache-cp15.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c
> index 1121dc3..bf79edd 100644
> --- a/arch/arm/lib/cache-cp15.c
> +++ b/arch/arm/lib/cache-cp15.c
> @@ -62,6 +62,7 @@ void mmu_set_region_dcache_behaviour(phys_addr_t start,
> size_t size,
> enum dcache_option option)
> {
> u32 *page_table = (u32 *)gd->arch.tlb_addr;
> + phys_addr_t startpt, stoppt;
> unsigned long upto, end;
>
> end = ALIGN(start + size, MMU_SECTION_SIZE) >> MMU_SECTION_SHIFT;
> @@ -70,7 +71,17 @@ void mmu_set_region_dcache_behaviour(phys_addr_t start,
> size_t size,
> option);
> for (upto = start; upto < end; upto++)
> set_section_dcache(upto, option);
> - mmu_page_table_flush((u32)&page_table[start], (u32)&page_table[end]);
> +
> + /*
> + * Make sure range is cache line aligned
> + * Only CPU maintains page tables, hence it is save to always
"safe"
> + * flush complete cache lines...
> + */
> + startpt = (phys_addr_t)&page_table[start];
> + startpt &= ~(CONFIG_SYS_CACHELINE_SIZE - 1);
> + stoppt = (phys_addr_t)&page_table[end];
> + stoppt = ALIGN(stoppt, CONFIG_SYS_CACHELINE_SIZE);
> + mmu_page_table_flush(startpt, stoppt);
> }
>
> __weak void dram_bank_mmu_setup(int bank)
Regards,
Andreas
--
SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
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