1 /* 2 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <bl_common.h> 32 #include <css_def.h> 33 #include <debug.h> 34 #include <mmio.h> 35 #include <plat_arm.h> 36 #include <string.h> 37 #include <utils.h> 38 #include "css_scp_bootloader.h" 39 40 /* Weak definition may be overridden in specific CSS based platform */ 41 #if LOAD_IMAGE_V2 42 #pragma weak plat_arm_bl2_handle_scp_bl2 43 #else 44 #pragma weak bl2_plat_handle_scp_bl2 45 #endif 46 47 /******************************************************************************* 48 * Transfer SCP_BL2 from Trusted RAM using the SCP Download protocol. 49 * Return 0 on success, -1 otherwise. 50 ******************************************************************************/ 51 #if LOAD_IMAGE_V2 52 int plat_arm_bl2_handle_scp_bl2(image_info_t *scp_bl2_image_info) 53 #else 54 int bl2_plat_handle_scp_bl2(image_info_t *scp_bl2_image_info) 55 #endif 56 { 57 int ret; 58 59 INFO("BL2: Initiating SCP_BL2 transfer to SCP\n"); 60 61 ret = scp_bootloader_transfer((void *)scp_bl2_image_info->image_base, 62 scp_bl2_image_info->image_size); 63 64 if (ret == 0) 65 INFO("BL2: SCP_BL2 transferred to SCP\n"); 66 else 67 ERROR("BL2: SCP_BL2 transfer failure\n"); 68 69 return ret; 70 } 71 72 #ifdef EL3_PAYLOAD_BASE 73 /* 74 * We need to override some of the platform functions when booting an EL3 75 * payload. 76 */ 77 78 static unsigned int scp_boot_config; 79 80 void bl2_early_platform_setup(meminfo_t *mem_layout) 81 { 82 arm_bl2_early_platform_setup(mem_layout); 83 84 /* Save SCP Boot config before it gets overwritten by SCP_BL2 loading */ 85 scp_boot_config = mmio_read_32(SCP_BOOT_CFG_ADDR); 86 VERBOSE("BL2: Saved SCP Boot config = 0x%x\n", scp_boot_config); 87 } 88 89 void bl2_platform_setup(void) 90 { 91 arm_bl2_platform_setup(); 92 93 /* 94 * Before releasing the AP cores out of reset, the SCP writes some data 95 * at the beginning of the Trusted SRAM. It is is overwritten before 96 * reaching this function. We need to restore this data, as if the 97 * target had just come out of reset. This implies: 98 * - zeroing the first 128 bytes of Trusted SRAM; 99 * - restoring the SCP boot configuration. 100 */ 101 VERBOSE("BL2: Restoring SCP reset data in Trusted SRAM\n"); 102 zero_normalmem((void *)ARM_TRUSTED_SRAM_BASE, 128); 103 mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config); 104 } 105 #endif /* EL3_PAYLOAD_BASE */ 106