u-boot/arch/arm/mach-stm32mp/dram_init.c
Patrick Delaunay 4a1b975dac board: stm32mp1: reserve memory for OP-TEE in device tree
Add reserve memory for OP-TEE in U-Boot and in kernel device tree:
- no more reduce the DDR size in "memory" node:
  CONFIG_SYS_MEM_TOP_HIDE is no more used
- U-Boot device-tree defines the needed "reserved-memory" for OP-TEE
  and U-Boot should not use this reserved memory: board_get_usable_ram_top
  use lmb lib to found the first free region, the not reserved
  memory, enough to relocate U-Boot: the needed size of U-Boot
  is estimated with gd->mon_len + CONFIG_SYS_MALLOC_LEN.
- the optee node ("optee@...": firmware with compatible "linaro,optee-tz")
  and the associated "reserved-memory" are deactivated in kernel device
  tree when OP-TEE is not detected by U-Boot to prevent kernel issue
  (memory is reserved but not used, optee driver probe failed).

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
2020-05-14 09:02:12 +02:00

51 lines
1 KiB
C

// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
*/
#include <common.h>
#include <dm.h>
#include <lmb.h>
#include <ram.h>
DECLARE_GLOBAL_DATA_PTR;
int dram_init(void)
{
struct ram_info ram;
struct udevice *dev;
int ret;
ret = uclass_get_device(UCLASS_RAM, 0, &dev);
if (ret) {
debug("RAM init failed: %d\n", ret);
return ret;
}
ret = ram_get_info(dev, &ram);
if (ret) {
debug("Cannot get RAM size: %d\n", ret);
return ret;
}
debug("RAM init base=%lx, size=%x\n", ram.base, ram.size);
gd->ram_size = ram.size;
return 0;
}
ulong board_get_usable_ram_top(ulong total_size)
{
phys_addr_t reg;
struct lmb lmb;
/* found enough not-reserved memory to relocated U-Boot */
lmb_init(&lmb);
lmb_add(&lmb, gd->ram_base, gd->ram_size);
boot_fdt_add_mem_rsv_regions(&lmb, (void *)gd->fdt_blob);
reg = lmb_alloc(&lmb, CONFIG_SYS_MALLOC_LEN + total_size, SZ_4K);
if (reg)
return ALIGN(reg + CONFIG_SYS_MALLOC_LEN + total_size, SZ_4K);
return gd->ram_top;
}