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