1 /* 2 * Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 9 #include <platform_def.h> 10 11 #include <common/debug.h> 12 #include <drivers/arm/tzc_dmc500.h> 13 14 #include <plat_arm.h> 15 16 /******************************************************************************* 17 * Initialize the DMC500-TrustZone Controller for ARM standard platforms. 18 * When booting an EL3 payload, this is simplified: we configure region 0 with 19 * secure access only and do not enable any other region. 20 ******************************************************************************/ 21 void arm_tzc_dmc500_setup(tzc_dmc500_driver_data_t *plat_driver_data, 22 const arm_tzc_regions_info_t *tzc_regions) 23 { 24 #ifndef EL3_PAYLOAD_BASE 25 unsigned int region_index = 1U; 26 const arm_tzc_regions_info_t *p; 27 const arm_tzc_regions_info_t init_tzc_regions[] = { 28 ARM_TZC_REGIONS_DEF, 29 {0} 30 }; 31 #endif 32 33 assert(plat_driver_data); 34 35 INFO("Configuring DMC-500 TZ Settings\n"); 36 37 tzc_dmc500_driver_init(plat_driver_data); 38 39 #ifndef EL3_PAYLOAD_BASE 40 if (tzc_regions == NULL) 41 p = init_tzc_regions; 42 else 43 p = tzc_regions; 44 45 /* Region 0 set to no access by default */ 46 tzc_dmc500_configure_region0(TZC_REGION_S_NONE, 0); 47 48 /* Rest Regions set according to tzc_regions array */ 49 for (; p->base != 0ULL; p++) { 50 tzc_dmc500_configure_region(region_index, p->base, p->end, 51 p->sec_attr, p->nsaid_permissions); 52 region_index++; 53 } 54 55 INFO("Total %u regions set.\n", region_index); 56 57 #else 58 /* Allow secure access only to DRAM for EL3 payloads */ 59 tzc_dmc500_configure_region0(TZC_REGION_S_RDWR, 0); 60 #endif 61 /* 62 * Raise an exception if a NS device tries to access secure memory 63 * TODO: Add interrupt handling support. 64 */ 65 tzc_dmc500_set_action(TZC_ACTION_RV_LOWERR); 66 67 /* 68 * Flush the configuration settings to have an affect. Validate 69 * flush by checking FILTER_EN is set on region 1 attributes 70 * register. 71 */ 72 tzc_dmc500_config_complete(); 73 74 /* 75 * Wait for the flush to complete. 76 * TODO: Have a timeout for this loop 77 */ 78 while (tzc_dmc500_verify_complete()) 79 ; 80 } 81