1 /* 2 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <bl_common.h> 8 #include <css_def.h> 9 #include <debug.h> 10 #include <mmio.h> 11 #include <plat_arm.h> 12 #include <string.h> 13 #include <utils.h> 14 #include "css_scp_bootloader.h" 15 16 /* Weak definition may be overridden in specific CSS based platform */ 17 #if LOAD_IMAGE_V2 18 #pragma weak plat_arm_bl2_handle_scp_bl2 19 #else 20 #pragma weak bl2_plat_handle_scp_bl2 21 #endif 22 23 /******************************************************************************* 24 * Transfer SCP_BL2 from Trusted RAM using the SCP Download protocol. 25 * Return 0 on success, -1 otherwise. 26 ******************************************************************************/ 27 #if LOAD_IMAGE_V2 28 int plat_arm_bl2_handle_scp_bl2(image_info_t *scp_bl2_image_info) 29 #else 30 int bl2_plat_handle_scp_bl2(image_info_t *scp_bl2_image_info) 31 #endif 32 { 33 int ret; 34 35 INFO("BL2: Initiating SCP_BL2 transfer to SCP\n"); 36 37 ret = scp_bootloader_transfer((void *)scp_bl2_image_info->image_base, 38 scp_bl2_image_info->image_size); 39 40 if (ret == 0) 41 INFO("BL2: SCP_BL2 transferred to SCP\n"); 42 else 43 ERROR("BL2: SCP_BL2 transfer failure\n"); 44 45 return ret; 46 } 47 48 #ifdef EL3_PAYLOAD_BASE 49 /* 50 * We need to override some of the platform functions when booting an EL3 51 * payload. 52 */ 53 54 static unsigned int scp_boot_config; 55 56 void bl2_early_platform_setup(meminfo_t *mem_layout) 57 { 58 arm_bl2_early_platform_setup(mem_layout); 59 60 /* Save SCP Boot config before it gets overwritten by SCP_BL2 loading */ 61 scp_boot_config = mmio_read_32(SCP_BOOT_CFG_ADDR); 62 VERBOSE("BL2: Saved SCP Boot config = 0x%x\n", scp_boot_config); 63 } 64 65 void bl2_platform_setup(void) 66 { 67 arm_bl2_platform_setup(); 68 69 /* 70 * Before releasing the AP cores out of reset, the SCP writes some data 71 * at the beginning of the Trusted SRAM. It is is overwritten before 72 * reaching this function. We need to restore this data, as if the 73 * target had just come out of reset. This implies: 74 * - zeroing the first 128 bytes of Trusted SRAM; 75 * - restoring the SCP boot configuration. 76 */ 77 VERBOSE("BL2: Restoring SCP reset data in Trusted SRAM\n"); 78 zero_normalmem((void *)ARM_TRUSTED_SRAM_BASE, 128); 79 mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config); 80 } 81 #endif /* EL3_PAYLOAD_BASE */ 82