[PATCH v4 26/27] stm32mp: compute ram_top based on the optee base address

[Sughosh Ganu]

The value of ram_top address currently gets computed in an indirect
manner. The boot_fdt_add_mem_rsv_regions() function gets called first
to reserve the memory region occupied by OP-TEE in the LMB memory
map. This is followed by a call to the lmb_alloc() API, which returns
an address which is below the OP-TEE base address. This address is the
value of ram_top returned by the board_get_usable_ram_top() function.

This has now changed, as the LMB memory map, which is no longer local,
gets set up after relocation. Get the OP-TEE base address by reading
the device tree, and set the ram_top from this value.

Signed-off-by: Sughosh Ganu <sughosh.g...@linaro.org>
---
Changes since V3: None

 arch/arm/mach-stm32mp/dram_init.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/arm/mach-stm32mp/dram_init.c 
b/arch/arm/mach-stm32mp/dram_init.c
index 286791be2e..198785353f 100644
--- a/arch/arm/mach-stm32mp/dram_init.c
+++ b/arch/arm/mach-stm32mp/dram_init.c
@@ -62,8 +62,10 @@ int dram_init(void)
 
 phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
 {
+       int ret;
        phys_size_t size;
        phys_addr_t reg;
+       u32 optee_start, optee_size;
 
        if (!total_size)
                return gd->ram_top;
@@ -73,16 +75,10 @@ phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
         * if the effective available memory is bigger
         */
        gd->ram_top = clamp_val(gd->ram_top, 0, SZ_4G - 1);
+       size = ALIGN(SZ_8M + CONFIG_SYS_MALLOC_LEN + total_size, 
MMU_SECTION_SIZE);
 
-       /* found enough not-reserved memory to relocated U-Boot */
-       lmb_add(gd->ram_base, gd->ram_top - gd->ram_base);
-       boot_fdt_add_mem_rsv_regions((void *)gd->fdt_blob);
-       /* add 8M for reserved memory for display, fdt, gd,... */
-       size = ALIGN(SZ_8M + CONFIG_SYS_MALLOC_LEN + total_size, 
MMU_SECTION_SIZE),
-       reg = lmb_alloc(size, MMU_SECTION_SIZE);
-
-       if (!reg)
-               reg = gd->ram_top - size;
+       ret = optee_get_reserved_memory(&optee_start, &optee_size);
+       reg = (!ret ? optee_start : gd->ram_top) - size;
 
        /* before relocation, mark the U-Boot memory as cacheable by default */
        if (!(gd->flags & GD_FLG_RELOC))
-- 
2.34.1