| /* |
| * Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <arch_helpers.h> |
| #include <assert.h> |
| #include <common/bl_common.h> |
| #include <context.h> |
| #include <lib/el3_runtime/context_mgmt.h> |
| #include <common/debug.h> |
| #include <denver.h> |
| #include <mce.h> |
| #include <plat/common/platform.h> |
| #include <lib/psci/psci.h> |
| #include <smmu.h> |
| #include <string.h> |
| #include <tegra_private.h> |
| #include <t194_nvg.h> |
| |
| extern void prepare_core_pwr_dwn(void); |
| |
| extern uint8_t tegra_fake_system_suspend; |
| |
| #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM |
| extern void tegra186_cpu_reset_handler(void); |
| extern uint32_t __tegra186_cpu_reset_handler_data, |
| __tegra186_cpu_reset_handler_end; |
| |
| /* TZDRAM offset for saving SMMU context */ |
| #define TEGRA186_SMMU_CTX_OFFSET 16 |
| #endif |
| |
| /* state id mask */ |
| #define TEGRA186_STATE_ID_MASK 0xF |
| /* constants to get power state's wake time */ |
| #define TEGRA186_WAKE_TIME_MASK 0x0FFFFFF0 |
| #define TEGRA186_WAKE_TIME_SHIFT 4 |
| /* default core wake mask for CPU_SUSPEND */ |
| #define TEGRA194_CORE_WAKE_MASK 0x180c |
| /* context size to save during system suspend */ |
| #define TEGRA186_SE_CONTEXT_SIZE 3 |
| |
| static uint32_t se_regs[TEGRA186_SE_CONTEXT_SIZE]; |
| static struct t18x_psci_percpu_data { |
| unsigned int wake_time; |
| } __aligned(CACHE_WRITEBACK_GRANULE) percpu_data[PLATFORM_CORE_COUNT]; |
| |
| int32_t tegra_soc_validate_power_state(unsigned int power_state, |
| psci_power_state_t *req_state) |
| { |
| int state_id = psci_get_pstate_id(power_state) & TEGRA186_STATE_ID_MASK; |
| int cpu = plat_my_core_pos(); |
| |
| /* save the core wake time (in TSC ticks)*/ |
| percpu_data[cpu].wake_time = (power_state & TEGRA186_WAKE_TIME_MASK) |
| << TEGRA186_WAKE_TIME_SHIFT; |
| |
| /* |
| * Clean percpu_data[cpu] to DRAM. This needs to be done to ensure that |
| * the correct value is read in tegra_soc_pwr_domain_suspend(), which |
| * is called with caches disabled. It is possible to read a stale value |
| * from DRAM in that function, because the L2 cache is not flushed |
| * unless the cluster is entering CC6/CC7. |
| */ |
| clean_dcache_range((uint64_t)&percpu_data[cpu], |
| sizeof(percpu_data[cpu])); |
| |
| /* Sanity check the requested state id */ |
| switch (state_id) { |
| case PSTATE_ID_CORE_IDLE: |
| case PSTATE_ID_CORE_POWERDN: |
| |
| /* Core powerdown request */ |
| req_state->pwr_domain_state[MPIDR_AFFLVL0] = state_id; |
| req_state->pwr_domain_state[MPIDR_AFFLVL1] = state_id; |
| |
| break; |
| |
| default: |
| ERROR("%s: unsupported state id (%d)\n", __func__, state_id); |
| return PSCI_E_INVALID_PARAMS; |
| } |
| |
| return PSCI_E_SUCCESS; |
| } |
| |
| int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state) |
| { |
| const plat_local_state_t *pwr_domain_state; |
| unsigned int stateid_afflvl0, stateid_afflvl2; |
| #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM |
| plat_params_from_bl2_t *params_from_bl2 = bl31_get_plat_params(); |
| uint64_t smmu_ctx_base; |
| #endif |
| uint32_t val; |
| mce_cstate_info_t cstate_info = { 0 }; |
| int cpu = plat_my_core_pos(); |
| |
| /* get the state ID */ |
| pwr_domain_state = target_state->pwr_domain_state; |
| stateid_afflvl0 = pwr_domain_state[MPIDR_AFFLVL0] & |
| TEGRA186_STATE_ID_MASK; |
| stateid_afflvl2 = pwr_domain_state[PLAT_MAX_PWR_LVL] & |
| TEGRA186_STATE_ID_MASK; |
| |
| if ((stateid_afflvl0 == PSTATE_ID_CORE_IDLE) || |
| (stateid_afflvl0 == PSTATE_ID_CORE_POWERDN)) { |
| |
| /* Enter CPU idle/powerdown */ |
| val = (stateid_afflvl0 == PSTATE_ID_CORE_IDLE) ? |
| TEGRA_NVG_CORE_C6 : TEGRA_NVG_CORE_C7; |
| (void)mce_command_handler(MCE_CMD_ENTER_CSTATE, val, |
| percpu_data[cpu].wake_time, 0); |
| |
| } else if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) { |
| |
| /* save SE registers */ |
| se_regs[0] = mmio_read_32(TEGRA_SE0_BASE + |
| SE_MUTEX_WATCHDOG_NS_LIMIT); |
| se_regs[1] = mmio_read_32(TEGRA_RNG1_BASE + |
| RNG_MUTEX_WATCHDOG_NS_LIMIT); |
| se_regs[2] = mmio_read_32(TEGRA_PKA1_BASE + |
| PKA_MUTEX_WATCHDOG_NS_LIMIT); |
| |
| /* save 'Secure Boot' Processor Feature Config Register */ |
| val = mmio_read_32(TEGRA_MISC_BASE + MISCREG_PFCFG); |
| mmio_write_32(TEGRA_SCRATCH_BASE + SECURE_SCRATCH_RSV6, val); |
| |
| #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM |
| /* save SMMU context */ |
| smmu_ctx_base = params_from_bl2->tzdram_base + |
| ((uintptr_t)&__tegra186_cpu_reset_handler_data - |
| (uintptr_t)tegra186_cpu_reset_handler) + |
| TEGRA186_SMMU_CTX_OFFSET; |
| tegra_smmu_save_context((uintptr_t)smmu_ctx_base); |
| #else |
| tegra_smmu_save_context(0); |
| #endif |
| |
| if (tegra_fake_system_suspend == 0U) { |
| |
| /* Prepare for system suspend */ |
| cstate_info.cluster = TEGRA_NVG_CLUSTER_CC6; |
| cstate_info.system = TEGRA_NVG_SYSTEM_SC7; |
| cstate_info.system_state_force = 1; |
| cstate_info.update_wake_mask = 1; |
| |
| mce_update_cstate_info(&cstate_info); |
| |
| do { |
| val = mce_command_handler( |
| MCE_CMD_IS_SC7_ALLOWED, |
| TEGRA_NVG_CORE_C7, |
| MCE_CORE_SLEEP_TIME_INFINITE, |
| 0); |
| } while (val == 0); |
| |
| /* Instruct the MCE to enter system suspend state */ |
| (void)mce_command_handler(MCE_CMD_ENTER_CSTATE, |
| TEGRA_NVG_CORE_C7, MCE_CORE_SLEEP_TIME_INFINITE, 0); |
| } |
| } |
| |
| return PSCI_E_SUCCESS; |
| } |
| |
| /******************************************************************************* |
| * Platform handler to calculate the proper target power level at the |
| * specified affinity level |
| ******************************************************************************/ |
| plat_local_state_t tegra_soc_get_target_pwr_state(unsigned int lvl, |
| const plat_local_state_t *states, |
| unsigned int ncpu) |
| { |
| plat_local_state_t target = *states; |
| int cluster_powerdn = 1; |
| int core_pos = read_mpidr() & MPIDR_CPU_MASK; |
| mce_cstate_info_t cstate_info = { 0 }; |
| |
| /* get the current core's power state */ |
| target = *(states + core_pos); |
| |
| /* CPU suspend */ |
| if (lvl == MPIDR_AFFLVL1 && target == PSTATE_ID_CORE_POWERDN) { |
| |
| /* Program default wake mask */ |
| cstate_info.wake_mask = TEGRA194_CORE_WAKE_MASK; |
| cstate_info.update_wake_mask = 1; |
| mce_update_cstate_info(&cstate_info); |
| } |
| |
| /* CPU off */ |
| if (lvl == MPIDR_AFFLVL1 && target == PLAT_MAX_OFF_STATE) { |
| |
| /* find out the number of ON cpus in the cluster */ |
| do { |
| target = *states++; |
| if (target != PLAT_MAX_OFF_STATE) |
| cluster_powerdn = 0; |
| } while (--ncpu); |
| |
| /* Enable cluster powerdn from last CPU in the cluster */ |
| if (cluster_powerdn) { |
| |
| /* Enable CC7 state and turn off wake mask */ |
| |
| } else { |
| |
| /* Turn off wake_mask */ |
| } |
| } |
| |
| /* System Suspend */ |
| if ((lvl == MPIDR_AFFLVL2) || (target == PSTATE_ID_SOC_POWERDN)) |
| return PSTATE_ID_SOC_POWERDN; |
| |
| /* default state */ |
| return PSCI_LOCAL_STATE_RUN; |
| } |
| |
| #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM |
| int tegra_soc_pwr_domain_power_down_wfi(const psci_power_state_t *target_state) |
| { |
| const plat_local_state_t *pwr_domain_state = |
| target_state->pwr_domain_state; |
| plat_params_from_bl2_t *params_from_bl2 = bl31_get_plat_params(); |
| unsigned int stateid_afflvl2 = pwr_domain_state[PLAT_MAX_PWR_LVL] & |
| TEGRA186_STATE_ID_MASK; |
| uint64_t val; |
| |
| if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) { |
| /* |
| * The TZRAM loses power when we enter system suspend. To |
| * allow graceful exit from system suspend, we need to copy |
| * BL3-1 over to TZDRAM. |
| */ |
| val = params_from_bl2->tzdram_base + |
| ((uintptr_t)&__tegra186_cpu_reset_handler_end - |
| (uintptr_t)tegra186_cpu_reset_handler); |
| memcpy((void *)(uintptr_t)val, (void *)(uintptr_t)BL31_BASE, |
| (uintptr_t)&__BL31_END__ - (uintptr_t)BL31_BASE); |
| } |
| |
| return PSCI_E_SUCCESS; |
| } |
| #endif |
| |
| int tegra_soc_pwr_domain_on(u_register_t mpidr) |
| { |
| int target_cpu = mpidr & MPIDR_CPU_MASK; |
| int target_cluster = (mpidr & MPIDR_CLUSTER_MASK) >> |
| MPIDR_AFFINITY_BITS; |
| |
| if (target_cluster > MPIDR_AFFLVL1) { |
| ERROR("%s: unsupported CPU (0x%lx)\n", __func__ , mpidr); |
| return PSCI_E_NOT_PRESENT; |
| } |
| |
| /* construct the target CPU # */ |
| target_cpu |= (target_cluster << 2); |
| |
| mce_command_handler(MCE_CMD_ONLINE_CORE, target_cpu, 0, 0); |
| |
| return PSCI_E_SUCCESS; |
| } |
| |
| int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state) |
| { |
| int stateid_afflvl2 = target_state->pwr_domain_state[PLAT_MAX_PWR_LVL]; |
| |
| /* |
| * Reset power state info for CPUs when onlining, we set |
| * deepest power when offlining a core but that may not be |
| * requested by non-secure sw which controls idle states. It |
| * will re-init this info from non-secure software when the |
| * core come online. |
| */ |
| |
| /* |
| * Check if we are exiting from deep sleep and restore SE |
| * context if we are. |
| */ |
| if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) { |
| |
| mmio_write_32(TEGRA_SE0_BASE + SE_MUTEX_WATCHDOG_NS_LIMIT, |
| se_regs[0]); |
| mmio_write_32(TEGRA_RNG1_BASE + RNG_MUTEX_WATCHDOG_NS_LIMIT, |
| se_regs[1]); |
| mmio_write_32(TEGRA_PKA1_BASE + PKA_MUTEX_WATCHDOG_NS_LIMIT, |
| se_regs[2]); |
| |
| /* Init SMMU */ |
| |
| /* |
| * Reset power state info for the last core doing SC7 |
| * entry and exit, we set deepest power state as CC7 |
| * and SC7 for SC7 entry which may not be requested by |
| * non-secure SW which controls idle states. |
| */ |
| } |
| |
| return PSCI_E_SUCCESS; |
| } |
| |
| int tegra_soc_pwr_domain_off(const psci_power_state_t *target_state) |
| { |
| int impl = (read_midr() >> MIDR_IMPL_SHIFT) & MIDR_IMPL_MASK; |
| |
| /* Disable Denver's DCO operations */ |
| if (impl == DENVER_IMPL) |
| denver_disable_dco(); |
| |
| /* Turn off CPU */ |
| |
| return PSCI_E_SUCCESS; |
| } |
| |
| __dead2 void tegra_soc_prepare_system_off(void) |
| { |
| /* System power off */ |
| |
| /* SC8 */ |
| |
| wfi(); |
| |
| /* wait for the system to power down */ |
| for (;;) { |
| ; |
| } |
| } |
| |
| int tegra_soc_prepare_system_reset(void) |
| { |
| return PSCI_E_SUCCESS; |
| } |