1 /* 2 * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <arm_dyn_cfg_helpers.h> 8 #include <assert.h> 9 #include <desc_image_load.h> 10 #include <fdt_wrappers.h> 11 #include <libfdt.h> 12 #include <plat_arm.h> 13 14 /******************************************************************************* 15 * Helper to read the `hw_config` property in config DTB. This function 16 * expects the following properties to be present in the config DTB. 17 * name : hw_config_addr size : 2 cells 18 * name : hw_config_max_size size : 1 cell 19 * 20 * Arguments: 21 * void *dtb - pointer to the TB_FW_CONFIG in memory 22 * int node - The node offset to appropriate node in the 23 * DTB. 24 * uint64_t *hw_config_addr - Returns the `hw_config` load address if read 25 * is successful. 26 * uint32_t *hw_config_size - Returns the `hw_config` size if read is 27 * successful. 28 * 29 * Returns 0 on success and -1 on error. 30 ******************************************************************************/ 31 int arm_dyn_get_hwconfig_info(void *dtb, int node, 32 uint64_t *hw_config_addr, uint32_t *hw_config_size) 33 { 34 int err; 35 36 assert(dtb != NULL); 37 assert(hw_config_addr != NULL); 38 assert(hw_config_size != NULL); 39 40 /* Check if the pointer to DT is correct */ 41 assert(fdt_check_header(dtb) == 0); 42 43 /* Assert the node offset point to "arm,tb_fw" compatible property */ 44 assert(node == fdt_node_offset_by_compatible(dtb, -1, "arm,tb_fw")); 45 46 err = fdtw_read_cells(dtb, node, "hw_config_addr", 2, 47 (void *) hw_config_addr); 48 if (err < 0) { 49 WARN("Read cell failed for hw_config_addr\n"); 50 return -1; 51 } 52 53 err = fdtw_read_cells(dtb, node, "hw_config_max_size", 1, 54 (void *) hw_config_size); 55 if (err < 0) { 56 WARN("Read cell failed for hw_config_max_size\n"); 57 return -1; 58 } 59 60 VERBOSE("Dyn cfg: Read hw_config address from TB_FW_CONFIG 0x%p %p\n", 61 hw_config_addr, hw_config_size); 62 63 return 0; 64 } 65 66 /******************************************************************************* 67 * Validate the tb_fw_config is a valid DTB file and returns the node offset 68 * to "arm,tb_fw" property. 69 * Arguments: 70 * void *dtb - pointer to the TB_FW_CONFIG in memory 71 * int *node - Returns the node offset to "arm,tb_fw" property if found. 72 * 73 * Returns 0 on success and -1 on error. 74 ******************************************************************************/ 75 int arm_dyn_tb_fw_cfg_init(void *dtb, int *node) 76 { 77 assert(dtb != NULL); 78 assert(node != NULL); 79 80 /* Check if the pointer to DT is correct */ 81 if (fdt_check_header(dtb) != 0) { 82 WARN("Invalid DTB file passed as TB_FW_CONFIG\n"); 83 return -1; 84 } 85 86 /* Assert the node offset point to "arm,tb_fw" compatible property */ 87 *node = fdt_node_offset_by_compatible(dtb, -1, "arm,tb_fw"); 88 if (*node < 0) { 89 WARN("The compatible property `arm,tb_fw` not found in the config\n"); 90 return -1; 91 } 92 93 VERBOSE("Dyn cfg: Found \"arm,tb_fw\" in the config\n"); 94 return 0; 95 } 96