Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <arch.h> |
| 8 | #include <arch_helpers.h> |
| 9 | #include <assert.h> |
| 10 | #include <common/bl_common.h> |
| 11 | #include <context.h> |
| 12 | #include <lib/el3_runtime/context_mgmt.h> |
| 13 | #include <common/debug.h> |
| 14 | #include <denver.h> |
| 15 | #include <mce.h> |
| 16 | #include <plat/common/platform.h> |
| 17 | #include <lib/psci/psci.h> |
| 18 | #include <smmu.h> |
| 19 | #include <string.h> |
| 20 | #include <tegra_private.h> |
| 21 | |
| 22 | extern void prepare_core_pwr_dwn(void); |
| 23 | |
| 24 | #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM |
| 25 | extern void tegra186_cpu_reset_handler(void); |
| 26 | extern uint32_t __tegra186_cpu_reset_handler_data, |
| 27 | __tegra186_cpu_reset_handler_end; |
| 28 | |
| 29 | /* TZDRAM offset for saving SMMU context */ |
| 30 | #define TEGRA186_SMMU_CTX_OFFSET 16 |
| 31 | #endif |
| 32 | |
| 33 | /* state id mask */ |
| 34 | #define TEGRA186_STATE_ID_MASK 0xF |
| 35 | /* constants to get power state's wake time */ |
| 36 | #define TEGRA186_WAKE_TIME_MASK 0x0FFFFFF0 |
| 37 | #define TEGRA186_WAKE_TIME_SHIFT 4 |
| 38 | /* default core wake mask for CPU_SUSPEND */ |
| 39 | #define TEGRA186_CORE_WAKE_MASK 0x180c |
| 40 | /* context size to save during system suspend */ |
| 41 | #define TEGRA186_SE_CONTEXT_SIZE 3 |
| 42 | |
| 43 | static uint32_t se_regs[TEGRA186_SE_CONTEXT_SIZE]; |
| 44 | static struct t18x_psci_percpu_data { |
| 45 | unsigned int wake_time; |
| 46 | } __aligned(CACHE_WRITEBACK_GRANULE) percpu_data[PLATFORM_CORE_COUNT]; |
| 47 | |
| 48 | int32_t tegra_soc_validate_power_state(unsigned int power_state, |
| 49 | psci_power_state_t *req_state) |
| 50 | { |
| 51 | int state_id = psci_get_pstate_id(power_state) & TEGRA186_STATE_ID_MASK; |
| 52 | int cpu = plat_my_core_pos(); |
| 53 | |
| 54 | /* save the core wake time (in TSC ticks)*/ |
| 55 | percpu_data[cpu].wake_time = (power_state & TEGRA186_WAKE_TIME_MASK) |
| 56 | << TEGRA186_WAKE_TIME_SHIFT; |
| 57 | |
| 58 | /* |
| 59 | * Clean percpu_data[cpu] to DRAM. This needs to be done to ensure that |
| 60 | * the correct value is read in tegra_soc_pwr_domain_suspend(), which |
| 61 | * is called with caches disabled. It is possible to read a stale value |
| 62 | * from DRAM in that function, because the L2 cache is not flushed |
| 63 | * unless the cluster is entering CC6/CC7. |
| 64 | */ |
| 65 | clean_dcache_range((uint64_t)&percpu_data[cpu], |
| 66 | sizeof(percpu_data[cpu])); |
| 67 | |
| 68 | /* Sanity check the requested state id */ |
| 69 | switch (state_id) { |
| 70 | case PSTATE_ID_CORE_IDLE: |
| 71 | case PSTATE_ID_CORE_POWERDN: |
| 72 | |
| 73 | /* Core powerdown request */ |
| 74 | req_state->pwr_domain_state[MPIDR_AFFLVL0] = state_id; |
| 75 | req_state->pwr_domain_state[MPIDR_AFFLVL1] = state_id; |
| 76 | |
| 77 | break; |
| 78 | |
| 79 | default: |
| 80 | ERROR("%s: unsupported state id (%d)\n", __func__, state_id); |
| 81 | return PSCI_E_INVALID_PARAMS; |
| 82 | } |
| 83 | |
| 84 | return PSCI_E_SUCCESS; |
| 85 | } |
| 86 | |
| 87 | int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state) |
| 88 | { |
| 89 | const plat_local_state_t *pwr_domain_state; |
| 90 | unsigned int stateid_afflvl0, stateid_afflvl2; |
| 91 | #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM |
| 92 | plat_params_from_bl2_t *params_from_bl2 = bl31_get_plat_params(); |
| 93 | uint64_t smmu_ctx_base; |
| 94 | #endif |
| 95 | uint32_t val; |
| 96 | |
| 97 | /* get the state ID */ |
| 98 | pwr_domain_state = target_state->pwr_domain_state; |
| 99 | stateid_afflvl0 = pwr_domain_state[MPIDR_AFFLVL0] & |
| 100 | TEGRA186_STATE_ID_MASK; |
| 101 | stateid_afflvl2 = pwr_domain_state[PLAT_MAX_PWR_LVL] & |
| 102 | TEGRA186_STATE_ID_MASK; |
| 103 | |
| 104 | if ((stateid_afflvl0 == PSTATE_ID_CORE_IDLE) || |
| 105 | (stateid_afflvl0 == PSTATE_ID_CORE_POWERDN)) { |
| 106 | |
| 107 | /* Enter CPU idle/powerdown */ |
| 108 | |
| 109 | } else if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) { |
| 110 | |
| 111 | /* save SE registers */ |
| 112 | se_regs[0] = mmio_read_32(TEGRA_SE0_BASE + |
| 113 | SE_MUTEX_WATCHDOG_NS_LIMIT); |
| 114 | se_regs[1] = mmio_read_32(TEGRA_RNG1_BASE + |
| 115 | RNG_MUTEX_WATCHDOG_NS_LIMIT); |
| 116 | se_regs[2] = mmio_read_32(TEGRA_PKA1_BASE + |
| 117 | PKA_MUTEX_WATCHDOG_NS_LIMIT); |
| 118 | |
| 119 | /* save 'Secure Boot' Processor Feature Config Register */ |
| 120 | val = mmio_read_32(TEGRA_MISC_BASE + MISCREG_PFCFG); |
| 121 | mmio_write_32(TEGRA_SCRATCH_BASE + SECURE_SCRATCH_RSV6, val); |
| 122 | |
| 123 | #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM |
| 124 | /* save SMMU context */ |
| 125 | smmu_ctx_base = params_from_bl2->tzdram_base + |
| 126 | ((uintptr_t)&__tegra186_cpu_reset_handler_data - |
| 127 | (uintptr_t)tegra186_cpu_reset_handler) + |
| 128 | TEGRA186_SMMU_CTX_OFFSET; |
| 129 | tegra_smmu_save_context((uintptr_t)smmu_ctx_base); |
| 130 | #else |
| 131 | tegra_smmu_save_context(0); |
| 132 | #endif |
| 133 | |
| 134 | /* Instruct the MCE to enter system suspend state */ |
| 135 | } |
| 136 | |
| 137 | return PSCI_E_SUCCESS; |
| 138 | } |
| 139 | |
| 140 | /******************************************************************************* |
| 141 | * Platform handler to calculate the proper target power level at the |
| 142 | * specified affinity level |
| 143 | ******************************************************************************/ |
| 144 | plat_local_state_t tegra_soc_get_target_pwr_state(unsigned int lvl, |
| 145 | const plat_local_state_t *states, |
| 146 | unsigned int ncpu) |
| 147 | { |
| 148 | plat_local_state_t target = *states; |
| 149 | int cluster_powerdn = 1; |
| 150 | int core_pos = read_mpidr() & MPIDR_CPU_MASK; |
| 151 | |
| 152 | /* get the current core's power state */ |
| 153 | target = *(states + core_pos); |
| 154 | |
| 155 | /* CPU suspend */ |
| 156 | if (lvl == MPIDR_AFFLVL1 && target == PSTATE_ID_CORE_POWERDN) { |
| 157 | |
| 158 | /* Program default wake mask */ |
| 159 | |
| 160 | /* Check if CCx state is allowed. */ |
| 161 | } |
| 162 | |
| 163 | /* CPU off */ |
| 164 | if (lvl == MPIDR_AFFLVL1 && target == PLAT_MAX_OFF_STATE) { |
| 165 | |
| 166 | /* find out the number of ON cpus in the cluster */ |
| 167 | do { |
| 168 | target = *states++; |
| 169 | if (target != PLAT_MAX_OFF_STATE) |
| 170 | cluster_powerdn = 0; |
| 171 | } while (--ncpu); |
| 172 | |
| 173 | /* Enable cluster powerdn from last CPU in the cluster */ |
| 174 | if (cluster_powerdn) { |
| 175 | |
| 176 | /* Enable CC7 state and turn off wake mask */ |
| 177 | |
| 178 | } else { |
| 179 | |
| 180 | /* Turn off wake_mask */ |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | /* System Suspend */ |
| 185 | if ((lvl == MPIDR_AFFLVL2) || (target == PSTATE_ID_SOC_POWERDN)) |
| 186 | return PSTATE_ID_SOC_POWERDN; |
| 187 | |
| 188 | /* default state */ |
| 189 | return PSCI_LOCAL_STATE_RUN; |
| 190 | } |
| 191 | |
| 192 | #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM |
| 193 | int tegra_soc_pwr_domain_power_down_wfi(const psci_power_state_t *target_state) |
| 194 | { |
| 195 | const plat_local_state_t *pwr_domain_state = |
| 196 | target_state->pwr_domain_state; |
| 197 | plat_params_from_bl2_t *params_from_bl2 = bl31_get_plat_params(); |
| 198 | unsigned int stateid_afflvl2 = pwr_domain_state[PLAT_MAX_PWR_LVL] & |
| 199 | TEGRA186_STATE_ID_MASK; |
| 200 | uint32_t val; |
| 201 | |
| 202 | if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) { |
| 203 | /* |
| 204 | * The TZRAM loses power when we enter system suspend. To |
| 205 | * allow graceful exit from system suspend, we need to copy |
| 206 | * BL3-1 over to TZDRAM. |
| 207 | */ |
| 208 | val = params_from_bl2->tzdram_base + |
| 209 | ((uintptr_t)&__tegra186_cpu_reset_handler_end - |
| 210 | (uintptr_t)tegra186_cpu_reset_handler); |
| 211 | memcpy((void *)(uintptr_t)val, (void *)(uintptr_t)BL31_BASE, |
| 212 | (uintptr_t)&__BL31_END__ - (uintptr_t)BL31_BASE); |
| 213 | } |
| 214 | |
| 215 | return PSCI_E_SUCCESS; |
| 216 | } |
| 217 | #endif |
| 218 | |
| 219 | int tegra_soc_pwr_domain_on(u_register_t mpidr) |
| 220 | { |
| 221 | int target_cpu = mpidr & MPIDR_CPU_MASK; |
| 222 | int target_cluster = (mpidr & MPIDR_CLUSTER_MASK) >> |
| 223 | MPIDR_AFFINITY_BITS; |
| 224 | |
| 225 | if (target_cluster > MPIDR_AFFLVL1) { |
| 226 | ERROR("%s: unsupported CPU (0x%lx)\n", __func__ , mpidr); |
| 227 | return PSCI_E_NOT_PRESENT; |
| 228 | } |
| 229 | |
| 230 | /* construct the target CPU # */ |
| 231 | target_cpu |= (target_cluster << 2); |
| 232 | |
| 233 | mce_command_handler(MCE_CMD_ONLINE_CORE, target_cpu, 0, 0); |
| 234 | |
| 235 | return PSCI_E_SUCCESS; |
| 236 | } |
| 237 | |
| 238 | int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state) |
| 239 | { |
| 240 | int stateid_afflvl2 = target_state->pwr_domain_state[PLAT_MAX_PWR_LVL]; |
| 241 | |
| 242 | /* |
| 243 | * Reset power state info for CPUs when onlining, we set |
| 244 | * deepest power when offlining a core but that may not be |
| 245 | * requested by non-secure sw which controls idle states. It |
| 246 | * will re-init this info from non-secure software when the |
| 247 | * core come online. |
| 248 | */ |
| 249 | |
| 250 | /* |
| 251 | * Check if we are exiting from deep sleep and restore SE |
| 252 | * context if we are. |
| 253 | */ |
| 254 | if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) { |
| 255 | |
| 256 | mmio_write_32(TEGRA_SE0_BASE + SE_MUTEX_WATCHDOG_NS_LIMIT, |
| 257 | se_regs[0]); |
| 258 | mmio_write_32(TEGRA_RNG1_BASE + RNG_MUTEX_WATCHDOG_NS_LIMIT, |
| 259 | se_regs[1]); |
| 260 | mmio_write_32(TEGRA_PKA1_BASE + PKA_MUTEX_WATCHDOG_NS_LIMIT, |
| 261 | se_regs[2]); |
| 262 | |
| 263 | /* Init SMMU */ |
| 264 | |
| 265 | /* |
| 266 | * Reset power state info for the last core doing SC7 |
| 267 | * entry and exit, we set deepest power state as CC7 |
| 268 | * and SC7 for SC7 entry which may not be requested by |
| 269 | * non-secure SW which controls idle states. |
| 270 | */ |
| 271 | } |
| 272 | |
| 273 | return PSCI_E_SUCCESS; |
| 274 | } |
| 275 | |
| 276 | int tegra_soc_pwr_domain_off(const psci_power_state_t *target_state) |
| 277 | { |
| 278 | int impl = (read_midr() >> MIDR_IMPL_SHIFT) & MIDR_IMPL_MASK; |
| 279 | |
| 280 | /* Disable Denver's DCO operations */ |
| 281 | if (impl == DENVER_IMPL) |
| 282 | denver_disable_dco(); |
| 283 | |
| 284 | /* Turn off CPU */ |
| 285 | |
| 286 | return PSCI_E_SUCCESS; |
| 287 | } |
| 288 | |
| 289 | __dead2 void tegra_soc_prepare_system_off(void) |
| 290 | { |
| 291 | /* System power off */ |
| 292 | |
| 293 | /* SC8 */ |
| 294 | |
| 295 | wfi(); |
| 296 | |
| 297 | /* wait for the system to power down */ |
| 298 | for (;;) { |
| 299 | ; |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | int tegra_soc_prepare_system_reset(void) |
| 304 | { |
| 305 | return PSCI_E_SUCCESS; |
| 306 | } |