1 /* 2 * Copyright (c) 2019-2021, Arm Limited. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 9 #include <common/debug.h> 10 #include <common/fdt_wrappers.h> 11 #include <lib/fconf/fconf_dyn_cfg_getter.h> 12 #include <lib/object_pool.h> 13 #include <libfdt.h> 14 15 /* We currently use FW, TB_FW, SOC_FW, TOS_FW, NT_FW and HW configs */ 16 #define MAX_DTB_INFO U(6) 17 /* 18 * Compile time assert if FW_CONFIG_ID is 0 which is more 19 * unlikely as 0 is a valid image ID for FIP as per the current 20 * code but still to avoid code breakage in case of unlikely 21 * event when image IDs get changed. 22 */ 23 CASSERT(FW_CONFIG_ID != U(0), assert_invalid_fw_config_id); 24 25 static struct dyn_cfg_dtb_info_t dtb_infos[MAX_DTB_INFO]; 26 static OBJECT_POOL_ARRAY(dtb_info_pool, dtb_infos); 27 28 /* 29 * This function is used to alloc memory for config information from 30 * global pool and set the configuration information. 31 */ 32 void set_config_info(uintptr_t config_addr, uint32_t config_max_size, 33 unsigned int config_id) 34 { 35 struct dyn_cfg_dtb_info_t *dtb_info; 36 37 dtb_info = pool_alloc(&dtb_info_pool); 38 dtb_info->config_addr = config_addr; 39 dtb_info->config_max_size = config_max_size; 40 dtb_info->config_id = config_id; 41 } 42 43 /* Get index of the config_id image */ 44 unsigned int dyn_cfg_dtb_info_get_index(unsigned int config_id) 45 { 46 unsigned int index; 47 48 /* Positions index to the proper config-id */ 49 for (index = 0U; index < MAX_DTB_INFO; index++) { 50 if (dtb_infos[index].config_id == config_id) { 51 return index; 52 } 53 } 54 55 return FCONF_INVALID_IDX; 56 } 57 58 struct dyn_cfg_dtb_info_t *dyn_cfg_dtb_info_getter(unsigned int config_id) 59 { 60 /* Positions index to the proper config-id */ 61 unsigned int index = dyn_cfg_dtb_info_get_index(config_id); 62 63 if (index < MAX_DTB_INFO) { 64 return &dtb_infos[index]; 65 } 66 67 WARN("FCONF: Invalid config id %u\n", config_id); 68 69 return NULL; 70 } 71 72 int fconf_populate_dtb_registry(uintptr_t config) 73 { 74 int rc; 75 int node, child; 76 77 /* As libfdt use void *, we can't avoid this cast */ 78 const void *dtb = (void *)config; 79 80 /* 81 * In case of BL1, fw_config dtb information is already 82 * populated in global dtb_infos array by 'set_fw_config_info' 83 * function, Below check is present to avoid re-population of 84 * fw_config information. 85 * 86 * Other BLs, satisfy below check and populate fw_config information 87 * in global dtb_infos array. 88 */ 89 if (dtb_infos[0].config_id == 0U) { 90 uint32_t config_max_size = fdt_totalsize(dtb); 91 set_config_info(config, config_max_size, FW_CONFIG_ID); 92 } 93 94 /* Find the node offset point to "fconf,dyn_cfg-dtb_registry" compatible property */ 95 const char *compatible_str = "fconf,dyn_cfg-dtb_registry"; 96 node = fdt_node_offset_by_compatible(dtb, -1, compatible_str); 97 if (node < 0) { 98 ERROR("FCONF: Can't find %s compatible in dtb\n", compatible_str); 99 return node; 100 } 101 102 fdt_for_each_subnode(child, dtb, node) { 103 uint32_t config_max_size, config_id; 104 uintptr_t config_addr; 105 uint64_t val64; 106 107 /* Read configuration dtb information */ 108 rc = fdt_read_uint64(dtb, child, "load-address", &val64); 109 if (rc < 0) { 110 ERROR("FCONF: Incomplete configuration property in dtb-registry.\n"); 111 return rc; 112 } 113 config_addr = (uintptr_t)val64; 114 115 rc = fdt_read_uint32(dtb, child, "max-size", &config_max_size); 116 if (rc < 0) { 117 ERROR("FCONF: Incomplete configuration property in dtb-registry.\n"); 118 return rc; 119 } 120 121 rc = fdt_read_uint32(dtb, child, "id", &config_id); 122 if (rc < 0) { 123 ERROR("FCONF: Incomplete configuration property in dtb-registry.\n"); 124 return rc; 125 } 126 127 VERBOSE("FCONF: dyn_cfg.dtb_registry cell found with:\n"); 128 VERBOSE("\tload-address = %lx\n", config_addr); 129 VERBOSE("\tmax-size = 0x%x\n", config_max_size); 130 VERBOSE("\tconfig-id = %u\n", config_id); 131 132 set_config_info(config_addr, config_max_size, config_id); 133 } 134 135 if ((child < 0) && (child != -FDT_ERR_NOTFOUND)) { 136 ERROR("%d: fdt_for_each_subnode(): %d\n", __LINE__, node); 137 return child; 138 } 139 140 return 0; 141 } 142 143 FCONF_REGISTER_POPULATOR(FW_CONFIG, dyn_cfg, fconf_populate_dtb_registry); 144