1 /* 2 * Copyright (c) 2015-2018, 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 #if !CSS_USE_SCMI_SDS_DRIVER 52 # if defined(EL3_PAYLOAD_BASE) || JUNO_AARCH32_EL3_RUNTIME 53 54 /* 55 * We need to override some of the platform functions when booting an EL3 56 * payload or SP_MIN on Juno AArch32. This needs to be done only for 57 * SCPI/BOM SCP systems as in case of SDS, the structures remain in memory and 58 * don't need to be overwritten. 59 */ 60 61 static unsigned int scp_boot_config; 62 63 void bl2_early_platform_setup2(u_register_t arg0, u_register_t arg1, 64 u_register_t arg2, u_register_t arg3) 65 { 66 arm_bl2_early_platform_setup((uintptr_t)arg0, (meminfo_t *)arg1); 67 68 /* Save SCP Boot config before it gets overwritten by SCP_BL2 loading */ 69 scp_boot_config = mmio_read_32(SCP_BOOT_CFG_ADDR); 70 VERBOSE("BL2: Saved SCP Boot config = 0x%x\n", scp_boot_config); 71 } 72 73 void bl2_platform_setup(void) 74 { 75 arm_bl2_platform_setup(); 76 77 /* 78 * Before releasing the AP cores out of reset, the SCP writes some data 79 * at the beginning of the Trusted SRAM. It is is overwritten before 80 * reaching this function. We need to restore this data, as if the 81 * target had just come out of reset. This implies: 82 * - zeroing the first 128 bytes of Trusted SRAM using zeromem instead 83 * of zero_normalmem since this is device memory. 84 * - restoring the SCP boot configuration. 85 */ 86 VERBOSE("BL2: Restoring SCP reset data in Trusted SRAM\n"); 87 zeromem((void *) ARM_SHARED_RAM_BASE, 128); 88 mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config); 89 } 90 91 # endif /* EL3_PAYLOAD_BASE */ 92 93 #endif /* CSS_USE_SCMI_SDS_DRIVER */ 94