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 #include <t194_nvg.h> 22 #include <stdbool.h> 23 24 extern void prepare_core_pwr_dwn(void); 25 26 extern void tegra_secure_entrypoint(void); 27 28 #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM 29 extern void tegra186_cpu_reset_handler(void); 30 extern uint32_t __tegra186_cpu_reset_handler_data, 31 __tegra186_cpu_reset_handler_end; 32 33 /* TZDRAM offset for saving SMMU context */ 34 #define TEGRA186_SMMU_CTX_OFFSET 16 35 #endif 36 37 /* state id mask */ 38 #define TEGRA186_STATE_ID_MASK 0xF 39 /* constants to get power state's wake time */ 40 #define TEGRA186_WAKE_TIME_MASK 0x0FFFFFF0 41 #define TEGRA186_WAKE_TIME_SHIFT 4 42 /* default core wake mask for CPU_SUSPEND */ 43 #define TEGRA194_CORE_WAKE_MASK 0x180c 44 /* context size to save during system suspend */ 45 #define TEGRA186_SE_CONTEXT_SIZE 3 46 47 static uint32_t se_regs[TEGRA186_SE_CONTEXT_SIZE]; 48 static struct t18x_psci_percpu_data { 49 unsigned int wake_time; 50 } __aligned(CACHE_WRITEBACK_GRANULE) percpu_data[PLATFORM_CORE_COUNT]; 51 52 /* 53 * tegra_fake_system_suspend acts as a boolean var controlling whether 54 * we are going to take fake system suspend code or normal system suspend code 55 * path. This variable is set inside the sip call handlers, when the kernel 56 * requests an SIP call to set the suspend debug flags. 57 */ 58 bool tegra_fake_system_suspend; 59 60 int32_t tegra_soc_validate_power_state(unsigned int power_state, 61 psci_power_state_t *req_state) 62 { 63 int state_id = psci_get_pstate_id(power_state) & TEGRA186_STATE_ID_MASK; 64 int cpu = plat_my_core_pos(); 65 66 /* save the core wake time (in TSC ticks)*/ 67 percpu_data[cpu].wake_time = (power_state & TEGRA186_WAKE_TIME_MASK) 68 << TEGRA186_WAKE_TIME_SHIFT; 69 70 /* 71 * Clean percpu_data[cpu] to DRAM. This needs to be done to ensure that 72 * the correct value is read in tegra_soc_pwr_domain_suspend(), which 73 * is called with caches disabled. It is possible to read a stale value 74 * from DRAM in that function, because the L2 cache is not flushed 75 * unless the cluster is entering CC6/CC7. 76 */ 77 clean_dcache_range((uint64_t)&percpu_data[cpu], 78 sizeof(percpu_data[cpu])); 79 80 /* Sanity check the requested state id */ 81 switch (state_id) { 82 case PSTATE_ID_CORE_IDLE: 83 case PSTATE_ID_CORE_POWERDN: 84 85 /* Core powerdown request */ 86 req_state->pwr_domain_state[MPIDR_AFFLVL0] = state_id; 87 req_state->pwr_domain_state[MPIDR_AFFLVL1] = state_id; 88 89 break; 90 91 default: 92 ERROR("%s: unsupported state id (%d)\n", __func__, state_id); 93 return PSCI_E_INVALID_PARAMS; 94 } 95 96 return PSCI_E_SUCCESS; 97 } 98 99 int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state) 100 { 101 const plat_local_state_t *pwr_domain_state; 102 unsigned int stateid_afflvl0, stateid_afflvl2; 103 #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM 104 plat_params_from_bl2_t *params_from_bl2 = bl31_get_plat_params(); 105 uint64_t smmu_ctx_base; 106 #endif 107 uint32_t val; 108 mce_cstate_info_t sc7_cstate_info = { 109 .cluster = TEGRA_NVG_CLUSTER_CC6, 110 .system = TEGRA_NVG_SYSTEM_SC7, 111 .system_state_force = 1, 112 .update_wake_mask = 1, 113 }; 114 int cpu = plat_my_core_pos(); 115 int32_t ret = 0; 116 117 /* get the state ID */ 118 pwr_domain_state = target_state->pwr_domain_state; 119 stateid_afflvl0 = pwr_domain_state[MPIDR_AFFLVL0] & 120 TEGRA186_STATE_ID_MASK; 121 stateid_afflvl2 = pwr_domain_state[PLAT_MAX_PWR_LVL] & 122 TEGRA186_STATE_ID_MASK; 123 124 if ((stateid_afflvl0 == PSTATE_ID_CORE_IDLE) || 125 (stateid_afflvl0 == PSTATE_ID_CORE_POWERDN)) { 126 127 /* Enter CPU idle/powerdown */ 128 val = (stateid_afflvl0 == PSTATE_ID_CORE_IDLE) ? 129 TEGRA_NVG_CORE_C6 : TEGRA_NVG_CORE_C7; 130 ret = mce_command_handler(MCE_CMD_ENTER_CSTATE, val, 131 percpu_data[cpu].wake_time, 0); 132 assert(ret == 0); 133 134 } else if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) { 135 136 /* save SE registers */ 137 se_regs[0] = mmio_read_32(TEGRA_SE0_BASE + 138 SE_MUTEX_WATCHDOG_NS_LIMIT); 139 se_regs[1] = mmio_read_32(TEGRA_RNG1_BASE + 140 RNG_MUTEX_WATCHDOG_NS_LIMIT); 141 se_regs[2] = mmio_read_32(TEGRA_PKA1_BASE + 142 PKA_MUTEX_WATCHDOG_NS_LIMIT); 143 144 /* save 'Secure Boot' Processor Feature Config Register */ 145 val = mmio_read_32(TEGRA_MISC_BASE + MISCREG_PFCFG); 146 mmio_write_32(TEGRA_SCRATCH_BASE + SECURE_SCRATCH_RSV6, val); 147 148 #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM 149 /* save SMMU context */ 150 smmu_ctx_base = params_from_bl2->tzdram_base + 151 ((uintptr_t)&__tegra186_cpu_reset_handler_data - 152 (uintptr_t)tegra186_cpu_reset_handler) + 153 TEGRA186_SMMU_CTX_OFFSET; 154 tegra_smmu_save_context((uintptr_t)smmu_ctx_base); 155 #else 156 tegra_smmu_save_context(0); 157 #endif 158 159 if (!tegra_fake_system_suspend) { 160 161 /* Prepare for system suspend */ 162 mce_update_cstate_info(&sc7_cstate_info); 163 164 do { 165 val = mce_command_handler( 166 MCE_CMD_IS_SC7_ALLOWED, 167 TEGRA_NVG_CORE_C7, 168 MCE_CORE_SLEEP_TIME_INFINITE, 169 0); 170 } while (val == 0); 171 172 /* Instruct the MCE to enter system suspend state */ 173 (void)mce_command_handler(MCE_CMD_ENTER_CSTATE, 174 TEGRA_NVG_CORE_C7, MCE_CORE_SLEEP_TIME_INFINITE, 0); 175 } 176 } 177 178 return PSCI_E_SUCCESS; 179 } 180 181 /******************************************************************************* 182 * Platform handler to calculate the proper target power level at the 183 * specified affinity level 184 ******************************************************************************/ 185 plat_local_state_t tegra_soc_get_target_pwr_state(unsigned int lvl, 186 const plat_local_state_t *states, 187 unsigned int ncpu) 188 { 189 plat_local_state_t target = *states; 190 int cluster_powerdn = 1; 191 int core_pos = read_mpidr() & MPIDR_CPU_MASK; 192 mce_cstate_info_t cstate_info = { 0 }; 193 194 /* get the current core's power state */ 195 target = *(states + core_pos); 196 197 /* CPU suspend */ 198 if (lvl == MPIDR_AFFLVL1 && target == PSTATE_ID_CORE_POWERDN) { 199 200 /* Program default wake mask */ 201 cstate_info.wake_mask = TEGRA194_CORE_WAKE_MASK; 202 cstate_info.update_wake_mask = 1; 203 mce_update_cstate_info(&cstate_info); 204 } 205 206 /* CPU off */ 207 if (lvl == MPIDR_AFFLVL1 && target == PLAT_MAX_OFF_STATE) { 208 209 /* find out the number of ON cpus in the cluster */ 210 do { 211 target = *states++; 212 if (target != PLAT_MAX_OFF_STATE) 213 cluster_powerdn = 0; 214 } while (--ncpu); 215 216 /* Enable cluster powerdn from last CPU in the cluster */ 217 if (cluster_powerdn) { 218 219 /* Enable CC7 state and turn off wake mask */ 220 221 } else { 222 223 /* Turn off wake_mask */ 224 } 225 } 226 227 /* System Suspend */ 228 if ((lvl == MPIDR_AFFLVL2) || (target == PSTATE_ID_SOC_POWERDN)) 229 return PSTATE_ID_SOC_POWERDN; 230 231 /* default state */ 232 return PSCI_LOCAL_STATE_RUN; 233 } 234 235 #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM 236 int tegra_soc_pwr_domain_power_down_wfi(const psci_power_state_t *target_state) 237 { 238 const plat_local_state_t *pwr_domain_state = 239 target_state->pwr_domain_state; 240 plat_params_from_bl2_t *params_from_bl2 = bl31_get_plat_params(); 241 unsigned int stateid_afflvl2 = pwr_domain_state[PLAT_MAX_PWR_LVL] & 242 TEGRA186_STATE_ID_MASK; 243 uint64_t val; 244 u_register_t ns_sctlr_el1; 245 246 if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) { 247 /* 248 * The TZRAM loses power when we enter system suspend. To 249 * allow graceful exit from system suspend, we need to copy 250 * BL3-1 over to TZDRAM. 251 */ 252 val = params_from_bl2->tzdram_base + 253 ((uintptr_t)&__tegra186_cpu_reset_handler_end - 254 (uintptr_t)tegra186_cpu_reset_handler); 255 memcpy((void *)(uintptr_t)val, (void *)(uintptr_t)BL31_BASE, 256 (uintptr_t)&__BL31_END__ - (uintptr_t)BL31_BASE); 257 258 259 /* 260 * In fake suspend mode, ensure that the loopback procedure 261 * towards system suspend exit is started, instead of calling 262 * WFI. This is done by disabling both MMU's of EL1 & El3 263 * and calling tegra_secure_entrypoint(). 264 */ 265 if (tegra_fake_system_suspend) { 266 267 /* 268 * Disable EL1's MMU. 269 */ 270 ns_sctlr_el1 = read_sctlr_el1(); 271 ns_sctlr_el1 &= (~((u_register_t)SCTLR_M_BIT)); 272 write_sctlr_el1(ns_sctlr_el1); 273 274 /* 275 * Disable MMU to power up the CPU in a "clean" 276 * state 277 */ 278 disable_mmu_el3(); 279 tegra_secure_entrypoint(); 280 panic(); 281 } 282 } 283 284 return PSCI_E_SUCCESS; 285 } 286 #endif 287 288 int tegra_soc_pwr_domain_on(u_register_t mpidr) 289 { 290 uint32_t target_cpu = mpidr & MPIDR_CPU_MASK; 291 uint32_t target_cluster = (mpidr & MPIDR_CLUSTER_MASK) >> 292 MPIDR_AFFINITY_BITS; 293 294 if (target_cluster > MPIDR_AFFLVL1) { 295 ERROR("%s: unsupported CPU (0x%lx)\n", __func__ , mpidr); 296 return PSCI_E_NOT_PRESENT; 297 } 298 299 /* construct the target CPU # */ 300 target_cpu += (target_cluster << 1); 301 302 mce_command_handler(MCE_CMD_ONLINE_CORE, target_cpu, 0, 0); 303 304 return PSCI_E_SUCCESS; 305 } 306 307 int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state) 308 { 309 int stateid_afflvl2 = target_state->pwr_domain_state[PLAT_MAX_PWR_LVL]; 310 311 /* 312 * Reset power state info for CPUs when onlining, we set 313 * deepest power when offlining a core but that may not be 314 * requested by non-secure sw which controls idle states. It 315 * will re-init this info from non-secure software when the 316 * core come online. 317 */ 318 319 /* 320 * Check if we are exiting from deep sleep and restore SE 321 * context if we are. 322 */ 323 if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) { 324 325 mmio_write_32(TEGRA_SE0_BASE + SE_MUTEX_WATCHDOG_NS_LIMIT, 326 se_regs[0]); 327 mmio_write_32(TEGRA_RNG1_BASE + RNG_MUTEX_WATCHDOG_NS_LIMIT, 328 se_regs[1]); 329 mmio_write_32(TEGRA_PKA1_BASE + PKA_MUTEX_WATCHDOG_NS_LIMIT, 330 se_regs[2]); 331 332 /* Init SMMU */ 333 334 tegra_smmu_init(); 335 336 /* 337 * Reset power state info for the last core doing SC7 338 * entry and exit, we set deepest power state as CC7 339 * and SC7 for SC7 entry which may not be requested by 340 * non-secure SW which controls idle states. 341 */ 342 } 343 344 return PSCI_E_SUCCESS; 345 } 346 347 int tegra_soc_pwr_domain_off(const psci_power_state_t *target_state) 348 { 349 int impl = (read_midr() >> MIDR_IMPL_SHIFT) & MIDR_IMPL_MASK; 350 351 /* Disable Denver's DCO operations */ 352 if (impl == DENVER_IMPL) 353 denver_disable_dco(); 354 355 /* Turn off CPU */ 356 357 return PSCI_E_SUCCESS; 358 } 359 360 __dead2 void tegra_soc_prepare_system_off(void) 361 { 362 /* System power off */ 363 364 /* SC8 */ 365 366 wfi(); 367 368 /* wait for the system to power down */ 369 for (;;) { 370 ; 371 } 372 } 373 374 int tegra_soc_prepare_system_reset(void) 375 { 376 return PSCI_E_SUCCESS; 377 } 378