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armv8: layerscape: Update early MMU for DDR after initialization

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In early MMU table, DDR has to be mapped as device memory to avoid
speculative access. After DDR is initialized, it needs to be updated
to normal memory to allow code execution. To simplify the code,
dram_init() is moved into a common file as a weak function.

Signed-off-by: York Sun <york.sun@nxp.com>
This commit is contained in:
York Sun
2017-03-06 09:02:34 -08:00
parent 7f9b9f318f
commit 4961eafc25
13 changed files with 113 additions and 38 deletions
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76
arch/arm/cpu/armv8/fsl-layerscape/cpu.c
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@@ -753,3 +753,79 @@ void efi_add_known_memory(void)
}
}
#endif
/*
* Before DDR size is known, early MMU table have DDR mapped as device memory
* to avoid speculative access. To relocate U-Boot to DDR, "normal memory"
* needs to be set for these mappings.
* If a special case configures DDR with holes in the mapping, the holes need
* to be marked as invalid. This is not implemented in this function.
*/
void update_early_mmu_table(void)
{
if (!gd->arch.tlb_addr)
return;
if (gd->ram_size <= CONFIG_SYS_FSL_DRAM_SIZE1) {
mmu_change_region_attr(
CONFIG_SYS_SDRAM_BASE,
gd->ram_size,
PTE_BLOCK_MEMTYPE(MT_NORMAL) |
PTE_BLOCK_OUTER_SHARE |
PTE_BLOCK_NS |
PTE_TYPE_VALID);
} else {
mmu_change_region_attr(
CONFIG_SYS_SDRAM_BASE,
CONFIG_SYS_DDR_BLOCK1_SIZE,
PTE_BLOCK_MEMTYPE(MT_NORMAL) |
PTE_BLOCK_OUTER_SHARE |
PTE_BLOCK_NS |
PTE_TYPE_VALID);
#ifdef CONFIG_SYS_DDR_BLOCK3_BASE
#ifndef CONFIG_SYS_DDR_BLOCK2_SIZE
#error "Missing CONFIG_SYS_DDR_BLOCK2_SIZE"
#endif
if (gd->ram_size - CONFIG_SYS_DDR_BLOCK1_SIZE >
CONFIG_SYS_DDR_BLOCK2_SIZE) {
mmu_change_region_attr(
CONFIG_SYS_DDR_BLOCK2_BASE,
CONFIG_SYS_DDR_BLOCK2_SIZE,
PTE_BLOCK_MEMTYPE(MT_NORMAL) |
PTE_BLOCK_OUTER_SHARE |
PTE_BLOCK_NS |
PTE_TYPE_VALID);
mmu_change_region_attr(
CONFIG_SYS_DDR_BLOCK3_BASE,
gd->ram_size -
CONFIG_SYS_DDR_BLOCK1_SIZE -
CONFIG_SYS_DDR_BLOCK2_SIZE,
PTE_BLOCK_MEMTYPE(MT_NORMAL) |
PTE_BLOCK_OUTER_SHARE |
PTE_BLOCK_NS |
PTE_TYPE_VALID);
} else
#endif
{
mmu_change_region_attr(
CONFIG_SYS_DDR_BLOCK2_BASE,
gd->ram_size -
CONFIG_SYS_DDR_BLOCK1_SIZE,
PTE_BLOCK_MEMTYPE(MT_NORMAL) |
PTE_BLOCK_OUTER_SHARE |
PTE_BLOCK_NS |
PTE_TYPE_VALID);
}
}
}
__weak int dram_init(void)
{
gd->ram_size = initdram(0);
#if !defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD)
/* This will break-before-make MMU for DDR */
update_early_mmu_table();
#endif
return 0;
}