1 /*
2 * Copyright (c) 2019-2022, 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 #include <platform_def.h>
16
17 /* We currently use FW, TB_FW, SOC_FW, TOS_FW, NT_FW and HW configs */
18 #define MAX_DTB_INFO U(6)
19 /*
20 * Compile time assert if FW_CONFIG_ID is 0 which is more
21 * unlikely as 0 is a valid image ID for FIP as per the current
22 * code but still to avoid code breakage in case of unlikely
23 * event when image IDs get changed.
24 */
25 CASSERT(FW_CONFIG_ID != U(0), assert_invalid_fw_config_id);
26
27 static struct dyn_cfg_dtb_info_t dtb_infos[MAX_DTB_INFO];
28 static OBJECT_POOL_ARRAY(dtb_info_pool, dtb_infos);
29
30 /*
31 * This function is used to alloc memory for config information from
32 * global pool and set the configuration information.
33 */
set_config_info(uintptr_t config_addr,uintptr_t ns_config_addr,uint32_t config_max_size,unsigned int config_id)34 void set_config_info(uintptr_t config_addr, uintptr_t ns_config_addr,
35 uint32_t config_max_size,
36 unsigned int config_id)
37 {
38 struct dyn_cfg_dtb_info_t *dtb_info;
39
40 dtb_info = pool_alloc(&dtb_info_pool);
41 dtb_info->config_addr = config_addr;
42 dtb_info->ns_config_addr = ns_config_addr;
43 dtb_info->config_max_size = config_max_size;
44 dtb_info->config_id = config_id;
45 }
46
47 /* Get index of the config_id image */
dyn_cfg_dtb_info_get_index(unsigned int config_id)48 unsigned int dyn_cfg_dtb_info_get_index(unsigned int config_id)
49 {
50 unsigned int index;
51
52 /* Positions index to the proper config-id */
53 for (index = 0U; index < MAX_DTB_INFO; index++) {
54 if (dtb_infos[index].config_id == config_id) {
55 return index;
56 }
57 }
58
59 return FCONF_INVALID_IDX;
60 }
61
dyn_cfg_dtb_info_getter(unsigned int config_id)62 struct dyn_cfg_dtb_info_t *dyn_cfg_dtb_info_getter(unsigned int config_id)
63 {
64 /* Positions index to the proper config-id */
65 unsigned int index = dyn_cfg_dtb_info_get_index(config_id);
66
67 if (index < MAX_DTB_INFO) {
68 return &dtb_infos[index];
69 }
70
71 WARN("FCONF: Invalid config id %u\n", config_id);
72
73 return NULL;
74 }
75
fconf_populate_dtb_registry(uintptr_t config)76 int fconf_populate_dtb_registry(uintptr_t config)
77 {
78 int rc;
79 int node, child;
80
81 /* As libfdt use void *, we can't avoid this cast */
82 const void *dtb = (void *)config;
83
84 /*
85 * In case of BL1, fw_config dtb information is already
86 * populated in global dtb_infos array by 'set_fw_config_info'
87 * function, Below check is present to avoid re-population of
88 * fw_config information.
89 *
90 * Other BLs, satisfy below check and populate fw_config information
91 * in global dtb_infos array.
92 */
93 if (dtb_infos[0].config_id == 0U) {
94 uint32_t config_max_size = fdt_totalsize(dtb);
95 set_config_info(config, ~0UL, config_max_size, FW_CONFIG_ID);
96 }
97
98 /* Find the node offset point to "fconf,dyn_cfg-dtb_registry" compatible property */
99 const char *compatible_str = "fconf,dyn_cfg-dtb_registry";
100 node = fdt_node_offset_by_compatible(dtb, -1, compatible_str);
101 if (node < 0) {
102 ERROR("FCONF: Can't find %s compatible in dtb\n", compatible_str);
103 return node;
104 }
105
106 fdt_for_each_subnode(child, dtb, node) {
107 uint32_t config_max_size, config_id;
108 uintptr_t config_addr;
109 uintptr_t ns_config_addr = ~0UL;
110 uint64_t val64;
111
112 /* Read configuration dtb information */
113 rc = fdt_read_uint64(dtb, child, "load-address", &val64);
114 if (rc < 0) {
115 ERROR("FCONF: Incomplete configuration property in dtb-registry.\n");
116 return rc;
117 }
118 config_addr = (uintptr_t)val64;
119
120 rc = fdt_read_uint32(dtb, child, "max-size", &config_max_size);
121 if (rc < 0) {
122 ERROR("FCONF: Incomplete configuration property in dtb-registry.\n");
123 return rc;
124 }
125
126 rc = fdt_read_uint32(dtb, child, "id", &config_id);
127 if (rc < 0) {
128 ERROR("FCONF: Incomplete configuration property in dtb-registry.\n");
129 return rc;
130 }
131
132 VERBOSE("FCONF: dyn_cfg.dtb_registry cell found with:\n");
133 VERBOSE("\tload-address = %lx\n", config_addr);
134 VERBOSE("\tmax-size = 0x%x\n", config_max_size);
135 VERBOSE("\tconfig-id = %u\n", config_id);
136
137 rc = fdt_read_uint64(dtb, child, "ns-load-address", &val64);
138 if (rc == 0) {
139 ns_config_addr = (uintptr_t)val64;
140 VERBOSE("\tns-load-address = %lx\n", ns_config_addr);
141 }
142
143 set_config_info(config_addr, ns_config_addr, config_max_size,
144 config_id);
145 }
146
147 if ((child < 0) && (child != -FDT_ERR_NOTFOUND)) {
148 ERROR("%d: fdt_for_each_subnode(): %d\n", __LINE__, node);
149 return child;
150 }
151
152 return 0;
153 }
154
155 FCONF_REGISTER_POPULATOR(FW_CONFIG, dyn_cfg, fconf_populate_dtb_registry);
156