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rockchip: sdram: add dram bank with usable memory beyond 4GB

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Add a second dram bank of usable memory beyond the blob of space for
peripheral near 4GB. Any memory that exists beyond the 4GB mark is added
to the second bank.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Jonas Karlman 2023-02-07 17:27:11 +00:00 • committed by Kever Yang
parent bde73b14f0
commit 2ec15cabe9
1 changed files with 9 additions and 3 deletions
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12
arch/arm/mach-rockchip/sdram.c
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@ -37,13 +37,19 @@ struct tos_parameter_t {
int dram_init_banksize(void)
{
size_t top = min((unsigned long)(gd->ram_size + CFG_SYS_SDRAM_BASE),
(unsigned long)(gd->ram_top));
size_t ram_top = (unsigned long)(gd->ram_size + CFG_SYS_SDRAM_BASE);
size_t top = min((unsigned long)ram_top, (unsigned long)(gd->ram_top));
#ifdef CONFIG_ARM64
/* Reserve 0x200000 for ATF bl31 */
gd->bd->bi_dram[0].start = 0x200000;
gd->bd->bi_dram[0].size = top - gd->bd->bi_dram[0].start;
/* Add usable memory beyond the blob of space for peripheral near 4GB */
if (ram_top > SZ_4G && top < SZ_4G) {
gd->bd->bi_dram[1].start = SZ_4G;
gd->bd->bi_dram[1].size = ram_top - gd->bd->bi_dram[1].start;
}
#else
#ifdef CONFIG_SPL_OPTEE_IMAGE
struct tos_parameter_t *tos_parameter;
@ -181,7 +187,7 @@ size_t rockchip_sdram_size(phys_addr_t reg)
* 2. update board_get_usable_ram_top() and dram_init_banksize()
* to reserve memory for peripheral space after previous update.
*/
if (size_mb > (SDRAM_MAX_SIZE >> 20))
if (!IS_ENABLED(CONFIG_ARM64) && size_mb > (SDRAM_MAX_SIZE >> 20))
size_mb = (SDRAM_MAX_SIZE >> 20);
return (size_t)size_mb << 20;