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 <string.h> 8 9 #include <common/bl_common.h> 10 #include <common/debug.h> 11 #include <lib/mmio.h> 12 #include <lib/utils.h> 13 #include <plat/arm/common/plat_arm.h> 14 #include <platform_def.h> 15 16 #include "../drivers/scp/css_scp.h" 17 18 /* Weak definition may be overridden in specific CSS based platform */ 19 #pragma weak plat_arm_bl2_handle_scp_bl2 20 21 /******************************************************************************* 22 * Transfer SCP_BL2 from Trusted RAM using the SCP Download protocol. 23 * Return 0 on success, -1 otherwise. 24 ******************************************************************************/ 25 int plat_arm_bl2_handle_scp_bl2(image_info_t *scp_bl2_image_info) 26 { 27 int ret; 28 29 INFO("BL2: Initiating SCP_BL2 transfer to SCP\n"); 30 31 ret = css_scp_boot_image_xfer((void *)scp_bl2_image_info->image_base, 32 scp_bl2_image_info->image_size); 33 34 if (ret == 0) 35 ret = css_scp_boot_ready(); 36 37 if (ret == 0) 38 INFO("BL2: SCP_BL2 transferred to SCP\n"); 39 else 40 ERROR("BL2: SCP_BL2 transfer failure\n"); 41 42 return ret; 43 } 44 45 #if !CSS_USE_SCMI_SDS_DRIVER 46 # if defined(EL3_PAYLOAD_BASE) || JUNO_AARCH32_EL3_RUNTIME 47 48 /* 49 * We need to override some of the platform functions when booting an EL3 50 * payload or SP_MIN on Juno AArch32. This needs to be done only for 51 * SCPI/BOM SCP systems as in case of SDS, the structures remain in memory and 52 * don't need to be overwritten. 53 */ 54 55 static unsigned int scp_boot_config; 56 57 void bl2_early_platform_setup2(u_register_t arg0, u_register_t arg1, 58 u_register_t arg2, u_register_t arg3) 59 { 60 arm_bl2_early_platform_setup((uintptr_t)arg0, (meminfo_t *)arg1); 61 62 /* Save SCP Boot config before it gets overwritten by SCP_BL2 loading */ 63 scp_boot_config = mmio_read_32(SCP_BOOT_CFG_ADDR); 64 VERBOSE("BL2: Saved SCP Boot config = 0x%x\n", scp_boot_config); 65 } 66 67 void bl2_platform_setup(void) 68 { 69 arm_bl2_platform_setup(); 70 71 /* 72 * Before releasing the AP cores out of reset, the SCP writes some data 73 * at the beginning of the Trusted SRAM. It is is overwritten before 74 * reaching this function. We need to restore this data, as if the 75 * target had just come out of reset. This implies: 76 * - zeroing the first 128 bytes of Trusted SRAM using zeromem instead 77 * of zero_normalmem since this is device memory. 78 * - restoring the SCP boot configuration. 79 */ 80 VERBOSE("BL2: Restoring SCP reset data in Trusted SRAM\n"); 81 zeromem((void *) ARM_SHARED_RAM_BASE, 128); 82 mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config); 83 } 84 85 # endif /* EL3_PAYLOAD_BASE */ 86 87 #endif /* CSS_USE_SCMI_SDS_DRIVER */ 88