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 "../drivers/scp/css_scp.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 = css_scp_boot_image_xfer((void *)scp_bl2_image_info->image_base, 38 scp_bl2_image_info->image_size); 39 40 if (ret == 0) 41 ret = css_scp_boot_ready(); 42 43 if (ret == 0) 44 INFO("BL2: SCP_BL2 transferred to SCP\n"); 45 else 46 ERROR("BL2: SCP_BL2 transfer failure\n"); 47 48 return ret; 49 } 50 51 #ifdef EL3_PAYLOAD_BASE 52 /* 53 * We need to override some of the platform functions when booting an EL3 54 * payload. 55 */ 56 57 static unsigned int scp_boot_config; 58 59 void bl2_early_platform_setup(meminfo_t *mem_layout) 60 { 61 arm_bl2_early_platform_setup(mem_layout); 62 63 /* Save SCP Boot config before it gets overwritten by SCP_BL2 loading */ 64 scp_boot_config = mmio_read_32(SCP_BOOT_CFG_ADDR); 65 VERBOSE("BL2: Saved SCP Boot config = 0x%x\n", scp_boot_config); 66 } 67 68 void bl2_platform_setup(void) 69 { 70 arm_bl2_platform_setup(); 71 72 /* 73 * Before releasing the AP cores out of reset, the SCP writes some data 74 * at the beginning of the Trusted SRAM. It is is overwritten before 75 * reaching this function. We need to restore this data, as if the 76 * target had just come out of reset. This implies: 77 * - zeroing the first 128 bytes of Trusted SRAM using zeromem instead 78 * of zero_normalmem since this is device memory. 79 * - restoring the SCP boot configuration. 80 */ 81 VERBOSE("BL2: Restoring SCP reset data in Trusted SRAM\n"); 82 zeromem((void *) ARM_SHARED_RAM_BASE, 128); 83 mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config); 84 } 85 #endif /* EL3_PAYLOAD_BASE */ 86