1 /* 2 * Copyright (c) 2021-2023, Stephan Gerhold <stephan@gerhold.net> 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 9 #include <arch.h> 10 #include <lib/mmio.h> 11 12 #include "msm8916_config.h" 13 #include "msm8916_gicv2.h" 14 #include <msm8916_mmap.h> 15 #include <platform_def.h> 16 17 static void msm8916_configure_timer(void) 18 { 19 /* Set timer frequency */ 20 mmio_write_32(APCS_QTMR + CNTCTLBASE_CNTFRQ, PLAT_SYSCNT_FREQ); 21 22 /* Make all timer frames available to non-secure world */ 23 mmio_write_32(APCS_QTMR + CNTNSAR, GENMASK_32(7, 0)); 24 } 25 26 /* 27 * The APCS register regions always start with a SECURE register that should 28 * be cleared to 0 to only allow secure access. Since BL31 handles most of 29 * the CPU power management, most of them can be cleared to secure access only. 30 */ 31 #define APCS_GLB_SECURE_STS_NS BIT_32(0) 32 #define APCS_GLB_SECURE_PWR_NS BIT_32(1) 33 #define APCS_BOOT_START_ADDR_SEC (APCS_CFG + 0x04) 34 #define REMAP_EN BIT_32(0) 35 #define APCS_AA64NAA32_REG (APCS_CFG + 0x0c) 36 37 static void msm8916_configure_cpu_pm(void) 38 { 39 unsigned int cpu; 40 41 /* Disallow non-secure access to boot remapper / TCM registers */ 42 mmio_write_32(APCS_CFG, 0); 43 44 /* 45 * Disallow non-secure access to power management registers. 46 * However, allow STS and PWR since those also seem to control access 47 * to CPU frequency related registers (e.g. APCS_CMD_RCGR). If these 48 * bits are not set, CPU frequency control fails in the non-secure world. 49 */ 50 mmio_write_32(APCS_GLB, APCS_GLB_SECURE_STS_NS | APCS_GLB_SECURE_PWR_NS); 51 52 /* Disallow non-secure access to L2 SAW2 */ 53 mmio_write_32(APCS_L2_SAW2, 0); 54 55 /* Disallow non-secure access to CPU ACS and SAW2 */ 56 for (cpu = 0; cpu < PLATFORM_CORE_COUNT; cpu++) { 57 mmio_write_32(APCS_ALIAS_ACS(cpu), 0); 58 mmio_write_32(APCS_ALIAS_SAW2(cpu), 0); 59 } 60 61 /* Make sure all further warm boots end up in BL31 and aarch64 state */ 62 CASSERT((BL31_BASE & 0xffff) == 0, assert_bl31_base_64k_aligned); 63 mmio_write_32(APCS_BOOT_START_ADDR_SEC, BL31_BASE | REMAP_EN); 64 mmio_write_32(APCS_AA64NAA32_REG, 1); 65 } 66 67 /* 68 * MSM8916 has a special "interrupt aggregation logic" in the APPS SMMU, 69 * which allows routing context bank interrupts to one of 3 interrupt numbers 70 * ("TZ/HYP/NS"). Route all interrupts to the non-secure interrupt number 71 * by default to avoid special setup on the non-secure side. 72 */ 73 #define CLK_OFF BIT_32(31) 74 #define GCC_SMMU_CFG_CBCR (GCC_BASE + 0x12038) 75 #define GCC_APCS_SMMU_CLOCK_BRANCH_ENA_VOTE (GCC_BASE + 0x4500c) 76 #define SMMU_CFG_CLK_ENA BIT_32(12) 77 #define APPS_SMMU_INTR_SEL_NS (APPS_SMMU_QCOM + 0x2000) 78 #define APPS_SMMU_INTR_SEL_NS_EN_ALL U(0xffffffff) 79 80 static void msm8916_configure_smmu(void) 81 { 82 /* Enable SMMU configuration clock to enable register access */ 83 mmio_setbits_32(GCC_APCS_SMMU_CLOCK_BRANCH_ENA_VOTE, SMMU_CFG_CLK_ENA); 84 while (mmio_read_32(GCC_SMMU_CFG_CBCR) & CLK_OFF) 85 ; 86 87 /* Route all context bank interrupts to non-secure interrupt */ 88 mmio_write_32(APPS_SMMU_INTR_SEL_NS, APPS_SMMU_INTR_SEL_NS_EN_ALL); 89 90 /* Disable configuration clock again */ 91 mmio_clrbits_32(GCC_APCS_SMMU_CLOCK_BRANCH_ENA_VOTE, SMMU_CFG_CLK_ENA); 92 } 93 94 void msm8916_configure(void) 95 { 96 msm8916_gicv2_configure(); 97 msm8916_configure_timer(); 98 msm8916_configure_cpu_pm(); 99 msm8916_configure_smmu(); 100 } 101