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arm: armv8: mmu: add mem_map_from_dram_banks

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For armv8, U-Boot uses a static map defined as 'mem_map' for configuring
the MMU as part of mmu_setup.

But since the exact configuration of memory banks might not be known at
build time, many platforms such as imx9, versal2 etc. utilize
gd->bd->bi_dram to configure the static map at runtime.

Therefore this patch adds a new API mem_map_from_dram_banks that
modifies the static map in a similar way. Allowing the caller to map all
dram banks by just passing the index to last entry in their mem_map and
it's length.

Reviewed-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Anshul Dalal <anshuld@ti.com>
Tested-by: Wadim Egorov <w.egorov@phytec.de>
This commit is contained in:
Anshul Dalal
2025-10-17 18:45:27 +05:30
committed by Tom Rini
parent 9ebdbbc43e
commit fe2647f2a0
2 changed files with 39 additions and 0 deletions
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28
arch/arm/cpu/armv8/cache_v8.c
View File

@@ -58,6 +58,34 @@ static int get_effective_el(void)
return el;
}
int mem_map_from_dram_banks(unsigned int index, unsigned int len, u64 attrs)
{
unsigned int i;
int ret = fdtdec_setup_memory_banksize();
if (ret) {
log_err("%s: Failed to setup dram banks\n", __func__);
return ret;
}
if (index + CONFIG_NR_DRAM_BANKS >= len) {
log_err("%s: Provided mem_map array has insufficient size for DRAM entries\n",
__func__);
return -ENOMEM;
}
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
mem_map[index].virt = gd->bd->bi_dram[i].start;
mem_map[index].phys = gd->bd->bi_dram[i].start;
mem_map[index].size = gd->bd->bi_dram[i].size;
mem_map[index].attrs = attrs;
index++;
}
memset(&mem_map[index], 0, sizeof(mem_map[index]));
return 0;
}
u64 get_tcr(u64 *pips, u64 *pva_bits)
{
int el = get_effective_el();

11
arch/arm/include/asm/armv8/mmu.h
View File

@@ -194,8 +194,19 @@ struct mm_region {
u64 attrs;
};
/* Used as the memory map for MMU configuration by mmu_setup */
extern struct mm_region *mem_map;
void setup_pgtables(void);
/**
* mem_map_from_dram_banks() - Populate mem_map with entries corresponding to
* dram banks as per the gd. This should be called prior to mmu_setup.
*
* @index: The entry in mem_map to start the over-write
* @len: The size of mem_map
*/
int mem_map_from_dram_banks(unsigned int index, unsigned int len, u64 attrs);
u64 get_tcr(u64 *pips, u64 *pva_bits);
/**