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