blob: 73549aa0b24ed6b570e13e9c2409e7e469de7935 [file] [log] [blame]
/*
* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <bl_common.h>
#include <css_def.h>
#include <debug.h>
#include <mmio.h>
#include <plat_arm.h>
#include <string.h>
#include <utils.h>
#include "css_scp_bootloader.h"
/* Weak definition may be overridden in specific CSS based platform */
#if LOAD_IMAGE_V2
#pragma weak plat_arm_bl2_handle_scp_bl2
#else
#pragma weak bl2_plat_handle_scp_bl2
#endif
/*******************************************************************************
* Transfer SCP_BL2 from Trusted RAM using the SCP Download protocol.
* Return 0 on success, -1 otherwise.
******************************************************************************/
#if LOAD_IMAGE_V2
int plat_arm_bl2_handle_scp_bl2(image_info_t *scp_bl2_image_info)
#else
int bl2_plat_handle_scp_bl2(image_info_t *scp_bl2_image_info)
#endif
{
int ret;
INFO("BL2: Initiating SCP_BL2 transfer to SCP\n");
ret = scp_bootloader_transfer((void *)scp_bl2_image_info->image_base,
scp_bl2_image_info->image_size);
if (ret == 0)
INFO("BL2: SCP_BL2 transferred to SCP\n");
else
ERROR("BL2: SCP_BL2 transfer failure\n");
return ret;
}
#ifdef EL3_PAYLOAD_BASE
/*
* We need to override some of the platform functions when booting an EL3
* payload.
*/
static unsigned int scp_boot_config;
void bl2_early_platform_setup(meminfo_t *mem_layout)
{
arm_bl2_early_platform_setup(mem_layout);
/* Save SCP Boot config before it gets overwritten by SCP_BL2 loading */
scp_boot_config = mmio_read_32(SCP_BOOT_CFG_ADDR);
VERBOSE("BL2: Saved SCP Boot config = 0x%x\n", scp_boot_config);
}
void bl2_platform_setup(void)
{
arm_bl2_platform_setup();
/*
* Before releasing the AP cores out of reset, the SCP writes some data
* at the beginning of the Trusted SRAM. It is is overwritten before
* reaching this function. We need to restore this data, as if the
* target had just come out of reset. This implies:
* - zeroing the first 128 bytes of Trusted SRAM;
* - restoring the SCP boot configuration.
*/
VERBOSE("BL2: Restoring SCP reset data in Trusted SRAM\n");
zero_normalmem((void *)ARM_TRUSTED_SRAM_BASE, 128);
mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config);
}
#endif /* EL3_PAYLOAD_BASE */