1 /* 2 * Copyright (c) 2021-2022, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <string.h> 8 #include <common/debug.h> 9 #include <lib/mmio.h> 10 #include <emi_mpu.h> 11 12 #if ENABLE_EMI_MPU_SW_LOCK 13 static unsigned char region_lock_state[EMI_MPU_REGION_NUM]; 14 #endif 15 16 #define EMI_MPU_START_MASK (0x00FFFFFF) 17 #define EMI_MPU_END_MASK (0x00FFFFFF) 18 #define EMI_MPU_APC_SW_LOCK_MASK (0x00FFFFFF) 19 #define EMI_MPU_APC_HW_LOCK_MASK (0x80FFFFFF) 20 21 static int _emi_mpu_set_protection(unsigned int start, unsigned int end, 22 unsigned int apc) 23 { 24 unsigned int dgroup; 25 unsigned int region; 26 27 region = (start >> 24) & 0xFF; 28 start &= EMI_MPU_START_MASK; 29 dgroup = (end >> 24) & 0xFF; 30 end &= EMI_MPU_END_MASK; 31 32 if ((region >= EMI_MPU_REGION_NUM) || (dgroup > EMI_MPU_DGROUP_NUM)) { 33 WARN("invalid region, domain\n"); 34 return -1; 35 } 36 37 #if ENABLE_EMI_MPU_SW_LOCK 38 if (region_lock_state[region] == 1) { 39 WARN("invalid region\n"); 40 return -1; 41 } 42 43 if ((dgroup == 0U) && ((apc >> 31) & 0x1)) { 44 region_lock_state[region] = 1; 45 } 46 47 apc &= EMI_MPU_APC_SW_LOCK_MASK; 48 #else 49 apc &= EMI_MPU_APC_HW_LOCK_MASK; 50 #endif 51 52 if ((start >= DRAM_OFFSET) && (end >= start)) { 53 start -= DRAM_OFFSET; 54 end -= DRAM_OFFSET; 55 } else { 56 WARN("invalid range\n"); 57 return -1; 58 } 59 60 mmio_write_32(EMI_MPU_SA(region), start); 61 mmio_write_32(EMI_MPU_EA(region), end); 62 mmio_write_32(EMI_MPU_APC(region, dgroup), apc); 63 64 #if defined(SUB_EMI_MPU_BASE) 65 mmio_write_32(SUB_EMI_MPU_SA(region), start); 66 mmio_write_32(SUB_EMI_MPU_EA(region), end); 67 mmio_write_32(SUB_EMI_MPU_APC(region, dgroup), apc); 68 #endif 69 return 0; 70 } 71 72 int emi_mpu_set_protection(struct emi_region_info_t *region_info) 73 { 74 unsigned int start, end; 75 int i; 76 77 if (region_info->region >= EMI_MPU_REGION_NUM) { 78 WARN("invalid region\n"); 79 return -1; 80 } 81 82 start = (unsigned int)(region_info->start >> EMI_MPU_ALIGN_BITS) | 83 (region_info->region << 24); 84 85 for (i = EMI_MPU_DGROUP_NUM - 1; i >= 0; i--) { 86 end = (unsigned int)(region_info->end >> EMI_MPU_ALIGN_BITS) | (i << 24); 87 88 if (_emi_mpu_set_protection(start, end, region_info->apc[i]) < 0) { 89 WARN("failed to set emi mpu protection(%d, %d, %d)\n", 90 start, end, region_info->apc[i]); 91 } 92 } 93 94 return 0; 95 } 96 97 void emi_mpu_init(void) 98 { 99 struct emi_region_info_t region_info; 100 101 /* SCP DRAM */ 102 region_info.start = 0x50000000ULL; 103 region_info.end = 0x5109FFFFULL; 104 region_info.region = 2; 105 SET_ACCESS_PERMISSION(region_info.apc, 1, 106 FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN, 107 FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN, 108 FORBIDDEN, FORBIDDEN, FORBIDDEN, NO_PROTECTION, 109 FORBIDDEN, FORBIDDEN, FORBIDDEN, NO_PROTECTION); 110 emi_mpu_set_protection(®ion_info); 111 112 /* DSP protect address */ 113 region_info.start = 0x60000000ULL; /* dram base addr */ 114 region_info.end = 0x610FFFFFULL; 115 region_info.region = 3; 116 SET_ACCESS_PERMISSION(region_info.apc, 1, 117 FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN, 118 FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN, 119 FORBIDDEN, NO_PROTECTION, FORBIDDEN, FORBIDDEN, 120 FORBIDDEN, FORBIDDEN, FORBIDDEN, NO_PROTECTION); 121 emi_mpu_set_protection(®ion_info); 122 123 /* Forbidden All */ 124 region_info.start = 0x40000000ULL; /* dram base addr */ 125 region_info.end = 0x1FFFF0000ULL; 126 region_info.region = 4; 127 SET_ACCESS_PERMISSION(region_info.apc, 1, 128 FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN, 129 FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN, 130 FORBIDDEN, FORBIDDEN, FORBIDDEN, FORBIDDEN, 131 FORBIDDEN, FORBIDDEN, FORBIDDEN, NO_PROTECTION); 132 emi_mpu_set_protection(®ion_info); 133 } 134