1 /* 2 * Reference to the ARM TF Project, 3 * plat/arm/common/arm_bl2_setup.c 4 * Portions copyright (c) 2013-2016, ARM Limited and Contributors. All rights 5 * reserved. 6 * Copyright (C) 2016 Rockchip Electronic Co.,Ltd 7 * Written by Kever Yang <kever.yang@rock-chips.com> 8 * Copyright (C) 2017 Theobroma Systems Design und Consulting GmbH 9 * 10 * SPDX-License-Identifier: BSD-3-Clause 11 */ 12 13 #include <common.h> 14 #include <atf_common.h> 15 #include <errno.h> 16 #include <spl.h> 17 18 static struct bl2_to_bl31_params_mem bl31_params_mem; 19 static struct bl31_params *bl2_to_bl31_params; 20 21 /** 22 * bl2_plat_get_bl31_params() - prepare params for bl31. 23 * 24 * This function assigns a pointer to the memory that the platform has kept 25 * aside to pass platform specific and trusted firmware related information 26 * to BL31. This memory is allocated by allocating memory to 27 * bl2_to_bl31_params_mem structure which is a superset of all the 28 * structure whose information is passed to BL31 29 * NOTE: This function should be called only once and should be done 30 * before generating params to BL31 31 * 32 * @return bl31 params structure pointer 33 */ 34 static struct bl31_params *bl2_plat_get_bl31_params(uintptr_t bl33_entry) 35 { 36 struct entry_point_info *bl33_ep_info; 37 38 /* 39 * Initialise the memory for all the arguments that needs to 40 * be passed to BL31 41 */ 42 memset(&bl31_params_mem, 0, sizeof(struct bl2_to_bl31_params_mem)); 43 44 /* Assign memory for TF related information */ 45 bl2_to_bl31_params = &bl31_params_mem.bl31_params; 46 SET_PARAM_HEAD(bl2_to_bl31_params, ATF_PARAM_BL31, ATF_VERSION_1, 0); 47 48 /* Fill BL31 related information */ 49 SET_PARAM_HEAD(bl2_to_bl31_params->bl31_image_info, 50 ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0); 51 52 /* Fill BL32 related information if it exists */ 53 bl2_to_bl31_params->bl32_ep_info = &bl31_params_mem.bl32_ep_info; 54 SET_PARAM_HEAD(bl2_to_bl31_params->bl32_ep_info, ATF_PARAM_EP, 55 ATF_VERSION_1, 0); 56 bl2_to_bl31_params->bl32_image_info = &bl31_params_mem.bl32_image_info; 57 SET_PARAM_HEAD(bl2_to_bl31_params->bl32_image_info, 58 ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0); 59 #ifndef BL32_BASE 60 bl2_to_bl31_params->bl32_ep_info->pc = 0; 61 #endif /* BL32_BASE */ 62 63 /* Fill BL33 related information */ 64 bl2_to_bl31_params->bl33_ep_info = &bl31_params_mem.bl33_ep_info; 65 bl33_ep_info = &bl31_params_mem.bl33_ep_info; 66 SET_PARAM_HEAD(bl33_ep_info, ATF_PARAM_EP, ATF_VERSION_1, 67 ATF_EP_NON_SECURE); 68 69 /* BL33 expects to receive the primary CPU MPID (through x0) */ 70 bl33_ep_info->args.arg0 = 0xffff & read_mpidr(); 71 bl33_ep_info->pc = bl33_entry; 72 bl33_ep_info->spsr = SPSR_64(MODE_EL2, MODE_SP_ELX, 73 DISABLE_ALL_EXECPTIONS); 74 75 bl2_to_bl31_params->bl33_image_info = &bl31_params_mem.bl33_image_info; 76 SET_PARAM_HEAD(bl2_to_bl31_params->bl33_image_info, 77 ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0); 78 79 return bl2_to_bl31_params; 80 } 81 82 static inline void raw_write_daif(unsigned int daif) 83 { 84 __asm__ __volatile__("msr DAIF, %0\n\t" : : "r" (daif) : "memory"); 85 } 86 87 typedef void (*atf_entry_t)(struct bl31_params *params, void *plat_params); 88 89 static void bl31_entry(uintptr_t bl31_entry, uintptr_t bl33_entry, 90 uintptr_t fdt_addr) 91 { 92 struct bl31_params *bl31_params; 93 atf_entry_t atf_entry = (atf_entry_t)bl31_entry; 94 95 bl31_params = bl2_plat_get_bl31_params(bl33_entry); 96 97 raw_write_daif(SPSR_EXCEPTION_MASK); 98 dcache_disable(); 99 100 atf_entry((void *)bl31_params, (void *)fdt_addr); 101 } 102 103 static int spl_fit_images_find_uboot(void *blob) 104 { 105 int parent, node, ndepth; 106 const void *data; 107 108 if (!blob) 109 return -FDT_ERR_BADMAGIC; 110 111 parent = fdt_path_offset(blob, "/fit-images"); 112 if (parent < 0) 113 return -FDT_ERR_NOTFOUND; 114 115 for (node = fdt_next_node(blob, parent, &ndepth); 116 (node >= 0) && (ndepth > 0); 117 node = fdt_next_node(blob, node, &ndepth)) { 118 if (ndepth != 1) 119 continue; 120 121 data = fdt_getprop(blob, node, FIT_OS_PROP, NULL); 122 if (!data) 123 continue; 124 125 if (genimg_get_os_id(data) == IH_OS_U_BOOT) 126 return node; 127 }; 128 129 return -FDT_ERR_NOTFOUND; 130 } 131 132 uintptr_t spl_fit_images_get_entry(void *blob, int node) 133 { 134 ulong val; 135 136 val = fdt_getprop_u32(blob, node, "entry-point"); 137 if (val == FDT_ERROR) 138 val = fdt_getprop_u32(blob, node, "load-addr"); 139 140 debug("%s: entry point 0x%lx\n", __func__, val); 141 return val; 142 } 143 144 void spl_invoke_atf(struct spl_image_info *spl_image) 145 { 146 uintptr_t bl33_entry = CONFIG_SYS_TEXT_BASE; 147 void *blob = spl_image->fdt_addr; 148 uintptr_t platform_param = (uintptr_t)blob; 149 int node; 150 151 /* 152 * Find the U-Boot binary (in /fit-images) load addreess or 153 * entry point (if different) and pass it as the BL3-3 entry 154 * point. 155 * This will need to be extended to support Falcon mode. 156 */ 157 158 node = spl_fit_images_find_uboot(blob); 159 if (node >= 0) 160 bl33_entry = spl_fit_images_get_entry(blob, node); 161 162 /* 163 * If ATF_NO_PLATFORM_PARAM is set, we override the platform 164 * parameter and always pass 0. This is a workaround for 165 * older ATF versions that have insufficiently robust (or 166 * overzealous) argument validation. 167 */ 168 if (CONFIG_IS_ENABLED(ATF_NO_PLATFORM_PARAM)) 169 platform_param = 0; 170 171 /* 172 * We don't provide a BL3-2 entry yet, but this will be possible 173 * using similar logic. 174 */ 175 bl31_entry(spl_image->entry_point, bl33_entry, platform_param); 176 } 177