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> |
Tejal Kudav | 153ba22 | 2017-02-14 18:02:04 -0800 | [diff] [blame] | 21 | #include <t194_nvg.h> |
Vignesh Radhakrishnan | d7a5c25 | 2017-05-25 16:27:42 -0700 | [diff] [blame] | 22 | #include <stdbool.h> |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 23 | |
| 24 | extern void prepare_core_pwr_dwn(void); |
| 25 | |
Vignesh Radhakrishnan | d7a5c25 | 2017-05-25 16:27:42 -0700 | [diff] [blame] | 26 | extern void tegra_secure_entrypoint(void); |
Vignesh Radhakrishnan | 0e2502f | 2017-04-10 15:07:39 -0700 | [diff] [blame] | 27 | |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 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 */ |
Krishna Sitaraman | c64afeb | 2017-01-23 16:15:44 -0800 | [diff] [blame] | 43 | #define TEGRA194_CORE_WAKE_MASK 0x180c |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 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 | |
Vignesh Radhakrishnan | d7a5c25 | 2017-05-25 16:27:42 -0700 | [diff] [blame] | 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 | |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 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; |
Vignesh Radhakrishnan | d7a5c25 | 2017-05-25 16:27:42 -0700 | [diff] [blame] | 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 | }; |
Krishna Sitaraman | c64afeb | 2017-01-23 16:15:44 -0800 | [diff] [blame] | 114 | int cpu = plat_my_core_pos(); |
Vignesh Radhakrishnan | d7a5c25 | 2017-05-25 16:27:42 -0700 | [diff] [blame] | 115 | int32_t ret = 0; |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 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 */ |
Krishna Sitaraman | c64afeb | 2017-01-23 16:15:44 -0800 | [diff] [blame] | 128 | val = (stateid_afflvl0 == PSTATE_ID_CORE_IDLE) ? |
| 129 | TEGRA_NVG_CORE_C6 : TEGRA_NVG_CORE_C7; |
Vignesh Radhakrishnan | d7a5c25 | 2017-05-25 16:27:42 -0700 | [diff] [blame] | 130 | ret = mce_command_handler(MCE_CMD_ENTER_CSTATE, val, |
Krishna Sitaraman | c64afeb | 2017-01-23 16:15:44 -0800 | [diff] [blame] | 131 | percpu_data[cpu].wake_time, 0); |
Vignesh Radhakrishnan | d7a5c25 | 2017-05-25 16:27:42 -0700 | [diff] [blame] | 132 | assert(ret == 0); |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 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 | |
Vignesh Radhakrishnan | d7a5c25 | 2017-05-25 16:27:42 -0700 | [diff] [blame] | 159 | if (!tegra_fake_system_suspend) { |
Vignesh Radhakrishnan | 0e2502f | 2017-04-10 15:07:39 -0700 | [diff] [blame] | 160 | |
| 161 | /* Prepare for system suspend */ |
Vignesh Radhakrishnan | d7a5c25 | 2017-05-25 16:27:42 -0700 | [diff] [blame] | 162 | mce_update_cstate_info(&sc7_cstate_info); |
Vignesh Radhakrishnan | 0e2502f | 2017-04-10 15:07:39 -0700 | [diff] [blame] | 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); |
Tejal Kudav | 153ba22 | 2017-02-14 18:02:04 -0800 | [diff] [blame] | 171 | |
Vignesh Radhakrishnan | 0e2502f | 2017-04-10 15:07:39 -0700 | [diff] [blame] | 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 | } |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 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; |
Krishna Sitaraman | c64afeb | 2017-01-23 16:15:44 -0800 | [diff] [blame] | 192 | mce_cstate_info_t cstate_info = { 0 }; |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 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 */ |
Krishna Sitaraman | c64afeb | 2017-01-23 16:15:44 -0800 | [diff] [blame] | 201 | cstate_info.wake_mask = TEGRA194_CORE_WAKE_MASK; |
| 202 | cstate_info.update_wake_mask = 1; |
| 203 | mce_update_cstate_info(&cstate_info); |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 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 | |
Krishna Sitaraman | 74813f9 | 2017-07-14 13:51:44 -0700 | [diff] [blame] | 219 | /* Enable CC6 */ |
| 220 | /* todo */ |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 221 | |
Krishna Sitaraman | 74813f9 | 2017-07-14 13:51:44 -0700 | [diff] [blame] | 222 | /* If cluster group needs to be railgated, request CG7 */ |
| 223 | /* todo */ |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 224 | |
Krishna Sitaraman | 74813f9 | 2017-07-14 13:51:44 -0700 | [diff] [blame] | 225 | /* Turn off wake mask */ |
| 226 | cstate_info.update_wake_mask = 1U; |
| 227 | mce_update_cstate_info(&cstate_info); |
| 228 | |
| 229 | } else { |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 230 | /* Turn off wake_mask */ |
Krishna Sitaraman | 74813f9 | 2017-07-14 13:51:44 -0700 | [diff] [blame] | 231 | cstate_info.update_wake_mask = 1U; |
| 232 | mce_update_cstate_info(&cstate_info); |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 233 | } |
| 234 | } |
| 235 | |
| 236 | /* System Suspend */ |
| 237 | if ((lvl == MPIDR_AFFLVL2) || (target == PSTATE_ID_SOC_POWERDN)) |
| 238 | return PSTATE_ID_SOC_POWERDN; |
| 239 | |
| 240 | /* default state */ |
| 241 | return PSCI_LOCAL_STATE_RUN; |
| 242 | } |
| 243 | |
| 244 | #if ENABLE_SYSTEM_SUSPEND_CTX_SAVE_TZDRAM |
| 245 | int tegra_soc_pwr_domain_power_down_wfi(const psci_power_state_t *target_state) |
| 246 | { |
| 247 | const plat_local_state_t *pwr_domain_state = |
| 248 | target_state->pwr_domain_state; |
| 249 | plat_params_from_bl2_t *params_from_bl2 = bl31_get_plat_params(); |
| 250 | unsigned int stateid_afflvl2 = pwr_domain_state[PLAT_MAX_PWR_LVL] & |
| 251 | TEGRA186_STATE_ID_MASK; |
Steven Kao | 55c2ce7 | 2016-12-23 15:51:32 +0800 | [diff] [blame] | 252 | uint64_t val; |
Vignesh Radhakrishnan | d7a5c25 | 2017-05-25 16:27:42 -0700 | [diff] [blame] | 253 | u_register_t ns_sctlr_el1; |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 254 | |
| 255 | if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) { |
| 256 | /* |
| 257 | * The TZRAM loses power when we enter system suspend. To |
| 258 | * allow graceful exit from system suspend, we need to copy |
| 259 | * BL3-1 over to TZDRAM. |
| 260 | */ |
| 261 | val = params_from_bl2->tzdram_base + |
| 262 | ((uintptr_t)&__tegra186_cpu_reset_handler_end - |
| 263 | (uintptr_t)tegra186_cpu_reset_handler); |
| 264 | memcpy((void *)(uintptr_t)val, (void *)(uintptr_t)BL31_BASE, |
| 265 | (uintptr_t)&__BL31_END__ - (uintptr_t)BL31_BASE); |
Vignesh Radhakrishnan | d7a5c25 | 2017-05-25 16:27:42 -0700 | [diff] [blame] | 266 | |
| 267 | |
| 268 | /* |
| 269 | * In fake suspend mode, ensure that the loopback procedure |
| 270 | * towards system suspend exit is started, instead of calling |
| 271 | * WFI. This is done by disabling both MMU's of EL1 & El3 |
| 272 | * and calling tegra_secure_entrypoint(). |
| 273 | */ |
| 274 | if (tegra_fake_system_suspend) { |
| 275 | |
| 276 | /* |
| 277 | * Disable EL1's MMU. |
| 278 | */ |
| 279 | ns_sctlr_el1 = read_sctlr_el1(); |
| 280 | ns_sctlr_el1 &= (~((u_register_t)SCTLR_M_BIT)); |
| 281 | write_sctlr_el1(ns_sctlr_el1); |
| 282 | |
| 283 | /* |
| 284 | * Disable MMU to power up the CPU in a "clean" |
| 285 | * state |
| 286 | */ |
| 287 | disable_mmu_el3(); |
| 288 | tegra_secure_entrypoint(); |
| 289 | panic(); |
| 290 | } |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 291 | } |
| 292 | |
| 293 | return PSCI_E_SUCCESS; |
| 294 | } |
| 295 | #endif |
| 296 | |
| 297 | int tegra_soc_pwr_domain_on(u_register_t mpidr) |
| 298 | { |
Varun Wadekar | f8b4b49 | 2017-06-22 10:35:38 -0700 | [diff] [blame] | 299 | uint32_t target_cpu = mpidr & MPIDR_CPU_MASK; |
| 300 | uint32_t target_cluster = (mpidr & MPIDR_CLUSTER_MASK) >> |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 301 | MPIDR_AFFINITY_BITS; |
| 302 | |
| 303 | if (target_cluster > MPIDR_AFFLVL1) { |
| 304 | ERROR("%s: unsupported CPU (0x%lx)\n", __func__ , mpidr); |
| 305 | return PSCI_E_NOT_PRESENT; |
| 306 | } |
| 307 | |
| 308 | /* construct the target CPU # */ |
Krishna Sitaraman | 832ad79 | 2017-06-30 13:51:12 -0700 | [diff] [blame] | 309 | target_cpu += (target_cluster << 1); |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 310 | |
| 311 | mce_command_handler(MCE_CMD_ONLINE_CORE, target_cpu, 0, 0); |
| 312 | |
| 313 | return PSCI_E_SUCCESS; |
| 314 | } |
| 315 | |
| 316 | int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state) |
| 317 | { |
| 318 | int stateid_afflvl2 = target_state->pwr_domain_state[PLAT_MAX_PWR_LVL]; |
| 319 | |
| 320 | /* |
| 321 | * Reset power state info for CPUs when onlining, we set |
| 322 | * deepest power when offlining a core but that may not be |
| 323 | * requested by non-secure sw which controls idle states. It |
| 324 | * will re-init this info from non-secure software when the |
| 325 | * core come online. |
| 326 | */ |
| 327 | |
| 328 | /* |
| 329 | * Check if we are exiting from deep sleep and restore SE |
| 330 | * context if we are. |
| 331 | */ |
| 332 | if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) { |
| 333 | |
| 334 | mmio_write_32(TEGRA_SE0_BASE + SE_MUTEX_WATCHDOG_NS_LIMIT, |
| 335 | se_regs[0]); |
| 336 | mmio_write_32(TEGRA_RNG1_BASE + RNG_MUTEX_WATCHDOG_NS_LIMIT, |
| 337 | se_regs[1]); |
| 338 | mmio_write_32(TEGRA_PKA1_BASE + PKA_MUTEX_WATCHDOG_NS_LIMIT, |
| 339 | se_regs[2]); |
| 340 | |
| 341 | /* Init SMMU */ |
| 342 | |
Vignesh Radhakrishnan | 978887f | 2017-07-11 15:16:08 -0700 | [diff] [blame] | 343 | tegra_smmu_init(); |
| 344 | |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 345 | /* |
| 346 | * Reset power state info for the last core doing SC7 |
| 347 | * entry and exit, we set deepest power state as CC7 |
| 348 | * and SC7 for SC7 entry which may not be requested by |
| 349 | * non-secure SW which controls idle states. |
| 350 | */ |
| 351 | } |
| 352 | |
| 353 | return PSCI_E_SUCCESS; |
| 354 | } |
| 355 | |
| 356 | int tegra_soc_pwr_domain_off(const psci_power_state_t *target_state) |
| 357 | { |
| 358 | int impl = (read_midr() >> MIDR_IMPL_SHIFT) & MIDR_IMPL_MASK; |
Krishna Sitaraman | 74813f9 | 2017-07-14 13:51:44 -0700 | [diff] [blame] | 359 | int32_t ret = 0; |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 360 | |
| 361 | /* Disable Denver's DCO operations */ |
| 362 | if (impl == DENVER_IMPL) |
| 363 | denver_disable_dco(); |
| 364 | |
| 365 | /* Turn off CPU */ |
Krishna Sitaraman | 74813f9 | 2017-07-14 13:51:44 -0700 | [diff] [blame] | 366 | ret = mce_command_handler(MCE_CMD_ENTER_CSTATE, |
| 367 | TEGRA_NVG_CORE_C7, MCE_CORE_SLEEP_TIME_INFINITE, 0); |
| 368 | assert(ret == 0); |
Varun Wadekar | ecd6a5a | 2018-04-09 17:48:58 -0700 | [diff] [blame] | 369 | |
| 370 | return PSCI_E_SUCCESS; |
| 371 | } |
| 372 | |
| 373 | __dead2 void tegra_soc_prepare_system_off(void) |
| 374 | { |
| 375 | /* System power off */ |
| 376 | |
| 377 | /* SC8 */ |
| 378 | |
| 379 | wfi(); |
| 380 | |
| 381 | /* wait for the system to power down */ |
| 382 | for (;;) { |
| 383 | ; |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | int tegra_soc_prepare_system_reset(void) |
| 388 | { |
| 389 | return PSCI_E_SUCCESS; |
| 390 | } |