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 #ifdef BL32_BASE 54 bl2_to_bl31_params->bl32_ep_info = &bl31_params_mem.bl32_ep_info; 55 SET_PARAM_HEAD(bl2_to_bl31_params->bl32_ep_info, ATF_PARAM_EP, 56 ATF_VERSION_1, 0); 57 bl2_to_bl31_params->bl32_image_info = &bl31_params_mem.bl32_image_info; 58 SET_PARAM_HEAD(bl2_to_bl31_params->bl32_image_info, 59 ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0); 60 #endif /* BL32_BASE */ 61 62 /* Fill BL33 related information */ 63 bl2_to_bl31_params->bl33_ep_info = &bl31_params_mem.bl33_ep_info; 64 bl33_ep_info = &bl31_params_mem.bl33_ep_info; 65 SET_PARAM_HEAD(bl33_ep_info, ATF_PARAM_EP, ATF_VERSION_1, 66 ATF_EP_NON_SECURE); 67 68 /* BL33 expects to receive the primary CPU MPID (through x0) */ 69 bl33_ep_info->args.arg0 = 0xffff & read_mpidr(); 70 bl33_ep_info->pc = bl33_entry; 71 bl33_ep_info->spsr = SPSR_64(MODE_EL2, MODE_SP_ELX, 72 DISABLE_ALL_EXECPTIONS); 73 74 bl2_to_bl31_params->bl33_image_info = &bl31_params_mem.bl33_image_info; 75 SET_PARAM_HEAD(bl2_to_bl31_params->bl33_image_info, 76 ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0); 77 78 return bl2_to_bl31_params; 79 } 80 81 static inline void raw_write_daif(unsigned int daif) 82 { 83 __asm__ __volatile__("msr DAIF, %0\n\t" : : "r" (daif) : "memory"); 84 } 85 86 typedef void (*atf_entry_t)(struct bl31_params *params, void *plat_params); 87 88 static void bl31_entry(uintptr_t bl31_entry, uintptr_t bl33_entry, 89 uintptr_t fdt_addr) 90 { 91 struct bl31_params *bl31_params; 92 atf_entry_t atf_entry = (atf_entry_t)bl31_entry; 93 94 bl31_params = bl2_plat_get_bl31_params(bl33_entry); 95 96 raw_write_daif(SPSR_EXCEPTION_MASK); 97 dcache_disable(); 98 99 atf_entry((void *)bl31_params, (void *)fdt_addr); 100 } 101 102 static int spl_fit_images_find_uboot(void *blob) 103 { 104 int parent, node, ndepth; 105 const void *data; 106 107 if (!blob) 108 return -FDT_ERR_BADMAGIC; 109 110 parent = fdt_path_offset(blob, "/fit-images"); 111 if (parent < 0) 112 return -FDT_ERR_NOTFOUND; 113 114 for (node = fdt_next_node(blob, parent, &ndepth); 115 (node >= 0) && (ndepth > 0); 116 node = fdt_next_node(blob, node, &ndepth)) { 117 if (ndepth != 1) 118 continue; 119 120 data = fdt_getprop(blob, node, FIT_OS_PROP, NULL); 121 if (!data) 122 continue; 123 124 if (genimg_get_os_id(data) == IH_OS_U_BOOT) 125 return node; 126 }; 127 128 return -FDT_ERR_NOTFOUND; 129 } 130 131 uintptr_t spl_fit_images_get_entry(void *blob, int node) 132 { 133 ulong val; 134 135 val = fdt_getprop_u32(blob, node, "entry-point"); 136 if (val == FDT_ERROR) 137 val = fdt_getprop_u32(blob, node, "load-addr"); 138 139 debug("%s: entry point 0x%lx\n", __func__, val); 140 return val; 141 } 142 143 void spl_invoke_atf(struct spl_image_info *spl_image) 144 { 145 uintptr_t bl33_entry = CONFIG_SYS_TEXT_BASE; 146 void *blob = spl_image->fdt_addr; 147 uintptr_t platform_param = (uintptr_t)blob; 148 int node; 149 150 /* 151 * Find the U-Boot binary (in /fit-images) load addreess or 152 * entry point (if different) and pass it as the BL3-3 entry 153 * point. 154 * This will need to be extended to support Falcon mode. 155 */ 156 157 node = spl_fit_images_find_uboot(blob); 158 if (node >= 0) 159 bl33_entry = spl_fit_images_get_entry(blob, node); 160 161 /* 162 * If ATF_NO_PLATFORM_PARAM is set, we override the platform 163 * parameter and always pass 0. This is a workaround for 164 * older ATF versions that have insufficiently robust (or 165 * overzealous) argument validation. 166 */ 167 if (CONFIG_IS_ENABLED(ATF_NO_PLATFORM_PARAM)) 168 platform_param = 0; 169 170 /* 171 * We don't provide a BL3-2 entry yet, but this will be possible 172 * using similar logic. 173 */ 174 bl31_entry(spl_image->entry_point, bl33_entry, platform_param); 175 } 176