blob: 002c6eb934f5a10105bc2a828419bf1eba935347 [file] [log] [blame]
/*
* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <string.h>
#include <common/bl_common.h>
#include <common/debug.h>
#include <drivers/arm/css/css_scp.h>
#include <lib/mmio.h>
#include <lib/utils.h>
#include <plat/arm/common/plat_arm.h>
#include <platform_def.h>
/* Weak definition may be overridden in specific CSS based platform */
#pragma weak plat_arm_bl2_handle_scp_bl2
/*******************************************************************************
* Transfer SCP_BL2 from Trusted RAM using the SCP Download protocol.
* Return 0 on success, -1 otherwise.
******************************************************************************/
int plat_arm_bl2_handle_scp_bl2(image_info_t *scp_bl2_image_info)
{
int ret;
INFO("BL2: Initiating SCP_BL2 transfer to SCP\n");
ret = css_scp_boot_image_xfer((void *)scp_bl2_image_info->image_base,
scp_bl2_image_info->image_size);
if (ret == 0)
ret = css_scp_boot_ready();
if (ret == 0)
INFO("BL2: SCP_BL2 transferred to SCP\n");
else
ERROR("BL2: SCP_BL2 transfer failure\n");
return ret;
}
#if !CSS_USE_SCMI_SDS_DRIVER
# if defined(EL3_PAYLOAD_BASE) || JUNO_AARCH32_EL3_RUNTIME
/*
* We need to override some of the platform functions when booting an EL3
* payload or SP_MIN on Juno AArch32. This needs to be done only for
* SCPI/BOM SCP systems as in case of SDS, the structures remain in memory and
* don't need to be overwritten.
*/
static unsigned int scp_boot_config;
void bl2_early_platform_setup2(u_register_t arg0, u_register_t arg1,
u_register_t arg2, u_register_t arg3)
{
arm_bl2_early_platform_setup((uintptr_t)arg0, (meminfo_t *)arg1);
/* 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 using zeromem instead
* of zero_normalmem since this is device memory.
* - restoring the SCP boot configuration.
*/
VERBOSE("BL2: Restoring SCP reset data in Trusted SRAM\n");
zeromem((void *) ARM_SHARED_RAM_BASE, 128);
mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config);
}
# endif /* EL3_PAYLOAD_BASE */
#endif /* CSS_USE_SCMI_SDS_DRIVER */