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arm: cache: always flush cache line size for page table

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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.agner@toradex.com>
Tested-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Stefan Agner 2016-08-14 21:33:01 -07:00 • committed by Tom Rini
parent c5b3cabf4a
commit 8f894a4d38
1 changed files with 13 additions and 1 deletions
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14
arch/arm/lib/cache-cp15.c
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@ -66,6 +66,7 @@ void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
#else #else
u32 *page_table = (u32 *)gd->arch.tlb_addr; u32 *page_table = (u32 *)gd->arch.tlb_addr;
#endif #endif
unsigned long startpt, stoppt;
unsigned long upto, end; unsigned long upto, end;
end = ALIGN(start + size, MMU_SECTION_SIZE) >> MMU_SECTION_SHIFT; end = ALIGN(start + size, MMU_SECTION_SIZE) >> MMU_SECTION_SHIFT;
@ -74,7 +75,18 @@ void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
option); option);
for (upto = start; upto < end; upto++) for (upto = start; upto < end; upto++)
set_section_dcache(upto, option); 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 safe to always
* flush complete cache lines...
*/
startpt = (unsigned long)&page_table[start];
startpt &= ~(CONFIG_SYS_CACHELINE_SIZE - 1);
stoppt = (unsigned long)&page_table[end];
stoppt = ALIGN(stoppt, CONFIG_SYS_CACHELINE_SIZE);
mmu_page_table_flush(startpt, stoppt);
} }
__weak void dram_bank_mmu_setup(int bank) __weak void dram_bank_mmu_setup(int bank)