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 #pragma weak plat_arm_bl2_handle_scp_bl2 18 19 /******************************************************************************* 20 * Transfer SCP_BL2 from Trusted RAM using the SCP Download protocol. 21 * Return 0 on success, -1 otherwise. 22 ******************************************************************************/ 23 int plat_arm_bl2_handle_scp_bl2(image_info_t *scp_bl2_image_info) 24 { 25 int ret; 26 27 INFO("BL2: Initiating SCP_BL2 transfer to SCP\n"); 28 29 ret = css_scp_boot_image_xfer((void *)scp_bl2_image_info->image_base, 30 scp_bl2_image_info->image_size); 31 32 if (ret == 0) 33 ret = css_scp_boot_ready(); 34 35 if (ret == 0) 36 INFO("BL2: SCP_BL2 transferred to SCP\n"); 37 else 38 ERROR("BL2: SCP_BL2 transfer failure\n"); 39 40 return ret; 41 } 42 43 #if !CSS_USE_SCMI_SDS_DRIVER 44 # if defined(EL3_PAYLOAD_BASE) || JUNO_AARCH32_EL3_RUNTIME 45 46 /* 47 * We need to override some of the platform functions when booting an EL3 48 * payload or SP_MIN on Juno AArch32. This needs to be done only for 49 * SCPI/BOM SCP systems as in case of SDS, the structures remain in memory and 50 * don't need to be overwritten. 51 */ 52 53 static unsigned int scp_boot_config; 54 55 void bl2_early_platform_setup2(u_register_t arg0, u_register_t arg1, 56 u_register_t arg2, u_register_t arg3) 57 { 58 arm_bl2_early_platform_setup((uintptr_t)arg0, (meminfo_t *)arg1); 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 using zeromem instead 75 * of zero_normalmem since this is device memory. 76 * - restoring the SCP boot configuration. 77 */ 78 VERBOSE("BL2: Restoring SCP reset data in Trusted SRAM\n"); 79 zeromem((void *) ARM_SHARED_RAM_BASE, 128); 80 mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config); 81 } 82 83 # endif /* EL3_PAYLOAD_BASE */ 84 85 #endif /* CSS_USE_SCMI_SDS_DRIVER */ 86