1 /* 2 * Copyright (c) 2019-2020, 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 struct dyn_cfg_dtb_info_t *dyn_cfg_dtb_info_getter(unsigned int config_id) 44 { 45 unsigned int index; 46 47 /* Positions index to the proper config-id */ 48 for (index = 0U; index < MAX_DTB_INFO; index++) { 49 if (dtb_infos[index].config_id == config_id) { 50 return &dtb_infos[index]; 51 } 52 } 53 54 WARN("FCONF: Invalid config id %u\n", config_id); 55 56 return NULL; 57 } 58 59 int fconf_populate_dtb_registry(uintptr_t config) 60 { 61 int rc; 62 int node, child; 63 64 /* As libfdt use void *, we can't avoid this cast */ 65 const void *dtb = (void *)config; 66 67 /* 68 * In case of BL1, fw_config dtb information is already 69 * populated in global dtb_infos array by 'set_fw_config_info' 70 * function, Below check is present to avoid re-population of 71 * fw_config information. 72 * 73 * Other BLs, satisfy below check and populate fw_config information 74 * in global dtb_infos array. 75 */ 76 if (dtb_infos[0].config_id == 0U) { 77 uint32_t config_max_size = fdt_totalsize(dtb); 78 set_config_info(config, config_max_size, FW_CONFIG_ID); 79 } 80 81 /* Find the node offset point to "fconf,dyn_cfg-dtb_registry" compatible property */ 82 const char *compatible_str = "fconf,dyn_cfg-dtb_registry"; 83 node = fdt_node_offset_by_compatible(dtb, -1, compatible_str); 84 if (node < 0) { 85 ERROR("FCONF: Can't find %s compatible in dtb\n", compatible_str); 86 return node; 87 } 88 89 fdt_for_each_subnode(child, dtb, node) { 90 uint32_t config_max_size, config_id; 91 uintptr_t config_addr; 92 uint64_t val64; 93 94 /* Read configuration dtb information */ 95 rc = fdt_read_uint64(dtb, child, "load-address", &val64); 96 if (rc < 0) { 97 ERROR("FCONF: Incomplete configuration property in dtb-registry.\n"); 98 return rc; 99 } 100 config_addr = (uintptr_t)val64; 101 102 rc = fdt_read_uint32(dtb, child, "max-size", &config_max_size); 103 if (rc < 0) { 104 ERROR("FCONF: Incomplete configuration property in dtb-registry.\n"); 105 return rc; 106 } 107 108 rc = fdt_read_uint32(dtb, child, "id", &config_id); 109 if (rc < 0) { 110 ERROR("FCONF: Incomplete configuration property in dtb-registry.\n"); 111 return rc; 112 } 113 114 VERBOSE("FCONF: dyn_cfg.dtb_registry cell found with:\n"); 115 VERBOSE("\tload-address = %lx\n", config_addr); 116 VERBOSE("\tmax-size = 0x%x\n", config_max_size); 117 VERBOSE("\tconfig-id = %u\n", config_id); 118 119 set_config_info(config_addr, config_max_size, config_id); 120 } 121 122 if ((child < 0) && (child != -FDT_ERR_NOTFOUND)) { 123 ERROR("%d: fdt_for_each_subnode(): %d\n", __LINE__, node); 124 return child; 125 } 126 127 return 0; 128 } 129 130 FCONF_REGISTER_POPULATOR(FW_CONFIG, dyn_cfg, fconf_populate_dtb_registry); 131