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