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1// SPDX-License-Identifier: GPL-2.0-only2/*3 *4 * Copyright (C) 2015 ARM Limited5 */6 7#define pr_fmt(fmt) "psci: " fmt8 9#include <linux/acpi.h>10#include <linux/arm-smccc.h>11#include <linux/cpuidle.h>12#include <linux/debugfs.h>13#include <linux/errno.h>14#include <linux/linkage.h>15#include <linux/of.h>16#include <linux/pm.h>17#include <linux/printk.h>18#include <linux/psci.h>19#include <linux/reboot.h>20#include <linux/slab.h>21#include <linux/suspend.h>22 23#include <uapi/linux/psci.h>24 25#include <asm/cpuidle.h>26#include <asm/cputype.h>27#include <asm/hypervisor.h>28#include <asm/system_misc.h>29#include <asm/smp_plat.h>30#include <asm/suspend.h>31 32/*33 * While a 64-bit OS can make calls with SMC32 calling conventions, for some34 * calls it is necessary to use SMC64 to pass or return 64-bit values.35 * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate36 * (native-width) function ID.37 */38#ifdef CONFIG_64BIT39#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name40#else41#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name42#endif43 44/*45 * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF46 * calls to its resident CPU, so we must avoid issuing those. We never migrate47 * a Trusted OS even if it claims to be capable of migration -- doing so will48 * require cooperation with a Trusted OS driver.49 */50static int resident_cpu = -1;51struct psci_operations psci_ops;52static enum arm_smccc_conduit psci_conduit = SMCCC_CONDUIT_NONE;53 54bool psci_tos_resident_on(int cpu)55{56 return cpu == resident_cpu;57}58 59typedef unsigned long (psci_fn)(unsigned long, unsigned long,60 unsigned long, unsigned long);61static psci_fn *invoke_psci_fn;62 63static struct psci_0_1_function_ids psci_0_1_function_ids;64 65struct psci_0_1_function_ids get_psci_0_1_function_ids(void)66{67 return psci_0_1_function_ids;68}69 70#define PSCI_0_2_POWER_STATE_MASK \71 (PSCI_0_2_POWER_STATE_ID_MASK | \72 PSCI_0_2_POWER_STATE_TYPE_MASK | \73 PSCI_0_2_POWER_STATE_AFFL_MASK)74 75#define PSCI_1_0_EXT_POWER_STATE_MASK \76 (PSCI_1_0_EXT_POWER_STATE_ID_MASK | \77 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)78 79static u32 psci_cpu_suspend_feature;80static bool psci_system_reset2_supported;81 82static inline bool psci_has_ext_power_state(void)83{84 return psci_cpu_suspend_feature &85 PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;86}87 88bool psci_has_osi_support(void)89{90 return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED;91}92 93static inline bool psci_power_state_loses_context(u32 state)94{95 const u32 mask = psci_has_ext_power_state() ?96 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK :97 PSCI_0_2_POWER_STATE_TYPE_MASK;98 99 return state & mask;100}101 102bool psci_power_state_is_valid(u32 state)103{104 const u32 valid_mask = psci_has_ext_power_state() ?105 PSCI_1_0_EXT_POWER_STATE_MASK :106 PSCI_0_2_POWER_STATE_MASK;107 108 return !(state & ~valid_mask);109}110 111static __always_inline unsigned long112__invoke_psci_fn_hvc(unsigned long function_id,113 unsigned long arg0, unsigned long arg1,114 unsigned long arg2)115{116 struct arm_smccc_res res;117 118 arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);119 return res.a0;120}121 122static __always_inline unsigned long123__invoke_psci_fn_smc(unsigned long function_id,124 unsigned long arg0, unsigned long arg1,125 unsigned long arg2)126{127 struct arm_smccc_res res;128 129 arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);130 return res.a0;131}132 133static __always_inline int psci_to_linux_errno(int errno)134{135 switch (errno) {136 case PSCI_RET_SUCCESS:137 return 0;138 case PSCI_RET_NOT_SUPPORTED:139 return -EOPNOTSUPP;140 case PSCI_RET_INVALID_PARAMS:141 case PSCI_RET_INVALID_ADDRESS:142 return -EINVAL;143 case PSCI_RET_DENIED:144 return -EPERM;145 }146 147 return -EINVAL;148}149 150static u32 psci_0_1_get_version(void)151{152 return PSCI_VERSION(0, 1);153}154 155static u32 psci_0_2_get_version(void)156{157 return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);158}159 160int psci_set_osi_mode(bool enable)161{162 unsigned long suspend_mode;163 int err;164 165 suspend_mode = enable ? PSCI_1_0_SUSPEND_MODE_OSI :166 PSCI_1_0_SUSPEND_MODE_PC;167 168 err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0);169 if (err < 0)170 pr_info(FW_BUG "failed to set %s mode: %d\n",171 enable ? "OSI" : "PC", err);172 return psci_to_linux_errno(err);173}174 175static __always_inline int176__psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)177{178 int err;179 180 err = invoke_psci_fn(fn, state, entry_point, 0);181 return psci_to_linux_errno(err);182}183 184static __always_inline int185psci_0_1_cpu_suspend(u32 state, unsigned long entry_point)186{187 return __psci_cpu_suspend(psci_0_1_function_ids.cpu_suspend,188 state, entry_point);189}190 191static __always_inline int192psci_0_2_cpu_suspend(u32 state, unsigned long entry_point)193{194 return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),195 state, entry_point);196}197 198static int __psci_cpu_off(u32 fn, u32 state)199{200 int err;201 202 err = invoke_psci_fn(fn, state, 0, 0);203 return psci_to_linux_errno(err);204}205 206static int psci_0_1_cpu_off(u32 state)207{208 return __psci_cpu_off(psci_0_1_function_ids.cpu_off, state);209}210 211static int psci_0_2_cpu_off(u32 state)212{213 return __psci_cpu_off(PSCI_0_2_FN_CPU_OFF, state);214}215 216static int __psci_cpu_on(u32 fn, unsigned long cpuid, unsigned long entry_point)217{218 int err;219 220 err = invoke_psci_fn(fn, cpuid, entry_point, 0);221 return psci_to_linux_errno(err);222}223 224static int psci_0_1_cpu_on(unsigned long cpuid, unsigned long entry_point)225{226 return __psci_cpu_on(psci_0_1_function_ids.cpu_on, cpuid, entry_point);227}228 229static int psci_0_2_cpu_on(unsigned long cpuid, unsigned long entry_point)230{231 return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point);232}233 234static int __psci_migrate(u32 fn, unsigned long cpuid)235{236 int err;237 238 err = invoke_psci_fn(fn, cpuid, 0, 0);239 return psci_to_linux_errno(err);240}241 242static int psci_0_1_migrate(unsigned long cpuid)243{244 return __psci_migrate(psci_0_1_function_ids.migrate, cpuid);245}246 247static int psci_0_2_migrate(unsigned long cpuid)248{249 return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid);250}251 252static int psci_affinity_info(unsigned long target_affinity,253 unsigned long lowest_affinity_level)254{255 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),256 target_affinity, lowest_affinity_level, 0);257}258 259static int psci_migrate_info_type(void)260{261 return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);262}263 264static unsigned long psci_migrate_info_up_cpu(void)265{266 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),267 0, 0, 0);268}269 270static void set_conduit(enum arm_smccc_conduit conduit)271{272 switch (conduit) {273 case SMCCC_CONDUIT_HVC:274 invoke_psci_fn = __invoke_psci_fn_hvc;275 break;276 case SMCCC_CONDUIT_SMC:277 invoke_psci_fn = __invoke_psci_fn_smc;278 break;279 default:280 WARN(1, "Unexpected PSCI conduit %d\n", conduit);281 }282 283 psci_conduit = conduit;284}285 286static int get_set_conduit_method(const struct device_node *np)287{288 const char *method;289 290 pr_info("probing for conduit method from DT.\n");291 292 if (of_property_read_string(np, "method", &method)) {293 pr_warn("missing \"method\" property\n");294 return -ENXIO;295 }296 297 if (!strcmp("hvc", method)) {298 set_conduit(SMCCC_CONDUIT_HVC);299 } else if (!strcmp("smc", method)) {300 set_conduit(SMCCC_CONDUIT_SMC);301 } else {302 pr_warn("invalid \"method\" property: %s\n", method);303 return -EINVAL;304 }305 return 0;306}307 308static int psci_sys_reset(struct notifier_block *nb, unsigned long action,309 void *data)310{311 if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) &&312 psci_system_reset2_supported) {313 /*314 * reset_type[31] = 0 (architectural)315 * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)316 * cookie = 0 (ignored by the implementation)317 */318 invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);319 } else {320 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);321 }322 323 return NOTIFY_DONE;324}325 326static struct notifier_block psci_sys_reset_nb = {327 .notifier_call = psci_sys_reset,328 .priority = 129,329};330 331static void psci_sys_poweroff(void)332{333 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);334}335 336static int psci_features(u32 psci_func_id)337{338 return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,339 psci_func_id, 0, 0);340}341 342#ifdef CONFIG_DEBUG_FS343 344#define PSCI_ID(ver, _name) \345 { .fn = PSCI_##ver##_FN_##_name, .name = #_name, }346#define PSCI_ID_NATIVE(ver, _name) \347 { .fn = PSCI_FN_NATIVE(ver, _name), .name = #_name, }348 349/* A table of all optional functions */350static const struct {351 u32 fn;352 const char *name;353} psci_fn_ids[] = {354 PSCI_ID_NATIVE(0_2, MIGRATE),355 PSCI_ID(0_2, MIGRATE_INFO_TYPE),356 PSCI_ID_NATIVE(0_2, MIGRATE_INFO_UP_CPU),357 PSCI_ID(1_0, CPU_FREEZE),358 PSCI_ID_NATIVE(1_0, CPU_DEFAULT_SUSPEND),359 PSCI_ID_NATIVE(1_0, NODE_HW_STATE),360 PSCI_ID_NATIVE(1_0, SYSTEM_SUSPEND),361 PSCI_ID(1_0, SET_SUSPEND_MODE),362 PSCI_ID_NATIVE(1_0, STAT_RESIDENCY),363 PSCI_ID_NATIVE(1_0, STAT_COUNT),364 PSCI_ID_NATIVE(1_1, SYSTEM_RESET2),365 PSCI_ID(1_1, MEM_PROTECT),366 PSCI_ID_NATIVE(1_1, MEM_PROTECT_CHECK_RANGE),367};368 369static int psci_debugfs_read(struct seq_file *s, void *data)370{371 int feature, type, i;372 u32 ver;373 374 ver = psci_ops.get_version();375 seq_printf(s, "PSCIv%d.%d\n",376 PSCI_VERSION_MAJOR(ver),377 PSCI_VERSION_MINOR(ver));378 379 /* PSCI_FEATURES is available only starting from 1.0 */380 if (PSCI_VERSION_MAJOR(ver) < 1)381 return 0;382 383 feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);384 if (feature != PSCI_RET_NOT_SUPPORTED) {385 ver = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);386 seq_printf(s, "SMC Calling Convention v%d.%d\n",387 PSCI_VERSION_MAJOR(ver),388 PSCI_VERSION_MINOR(ver));389 } else {390 seq_puts(s, "SMC Calling Convention v1.0 is assumed\n");391 }392 393 feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));394 if (feature < 0) {395 seq_printf(s, "PSCI_FEATURES(CPU_SUSPEND) error (%d)\n", feature);396 } else {397 seq_printf(s, "OSI is %ssupported\n",398 (feature & BIT(0)) ? "" : "not ");399 seq_printf(s, "%s StateID format is used\n",400 (feature & BIT(1)) ? "Extended" : "Original");401 }402 403 type = psci_ops.migrate_info_type();404 if (type == PSCI_0_2_TOS_UP_MIGRATE ||405 type == PSCI_0_2_TOS_UP_NO_MIGRATE) {406 unsigned long cpuid;407 408 seq_printf(s, "Trusted OS %smigrate capable\n",409 type == PSCI_0_2_TOS_UP_NO_MIGRATE ? "not " : "");410 cpuid = psci_migrate_info_up_cpu();411 seq_printf(s, "Trusted OS resident on physical CPU 0x%lx (#%d)\n",412 cpuid, resident_cpu);413 } else if (type == PSCI_0_2_TOS_MP) {414 seq_puts(s, "Trusted OS migration not required\n");415 } else {416 if (type != PSCI_RET_NOT_SUPPORTED)417 seq_printf(s, "MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);418 }419 420 for (i = 0; i < ARRAY_SIZE(psci_fn_ids); i++) {421 feature = psci_features(psci_fn_ids[i].fn);422 if (feature == PSCI_RET_NOT_SUPPORTED)423 continue;424 if (feature < 0)425 seq_printf(s, "PSCI_FEATURES(%s) error (%d)\n",426 psci_fn_ids[i].name, feature);427 else428 seq_printf(s, "%s is supported\n", psci_fn_ids[i].name);429 }430 431 return 0;432}433 434static int psci_debugfs_open(struct inode *inode, struct file *f)435{436 return single_open(f, psci_debugfs_read, NULL);437}438 439static const struct file_operations psci_debugfs_ops = {440 .owner = THIS_MODULE,441 .open = psci_debugfs_open,442 .release = single_release,443 .read = seq_read,444 .llseek = seq_lseek445};446 447static int __init psci_debugfs_init(void)448{449 if (!invoke_psci_fn || !psci_ops.get_version)450 return 0;451 452 return PTR_ERR_OR_ZERO(debugfs_create_file("psci", 0444, NULL, NULL,453 &psci_debugfs_ops));454}455late_initcall(psci_debugfs_init)456#endif457 458#ifdef CONFIG_CPU_IDLE459static noinstr int psci_suspend_finisher(unsigned long state)460{461 u32 power_state = state;462 phys_addr_t pa_cpu_resume;463 464 pa_cpu_resume = __pa_symbol_nodebug((unsigned long)cpu_resume);465 466 return psci_ops.cpu_suspend(power_state, pa_cpu_resume);467}468 469int psci_cpu_suspend_enter(u32 state)470{471 int ret;472 473 if (!psci_power_state_loses_context(state)) {474 struct arm_cpuidle_irq_context context;475 476 ct_cpuidle_enter();477 arm_cpuidle_save_irq_context(&context);478 ret = psci_ops.cpu_suspend(state, 0);479 arm_cpuidle_restore_irq_context(&context);480 ct_cpuidle_exit();481 } else {482 /*483 * ARM64 cpu_suspend() wants to do ct_cpuidle_*() itself.484 */485 if (!IS_ENABLED(CONFIG_ARM64))486 ct_cpuidle_enter();487 488 ret = cpu_suspend(state, psci_suspend_finisher);489 490 if (!IS_ENABLED(CONFIG_ARM64))491 ct_cpuidle_exit();492 }493 494 return ret;495}496#endif497 498static int psci_system_suspend(unsigned long unused)499{500 int err;501 phys_addr_t pa_cpu_resume = __pa_symbol(cpu_resume);502 503 err = invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),504 pa_cpu_resume, 0, 0);505 return psci_to_linux_errno(err);506}507 508static int psci_system_suspend_enter(suspend_state_t state)509{510 return cpu_suspend(0, psci_system_suspend);511}512 513static const struct platform_suspend_ops psci_suspend_ops = {514 .valid = suspend_valid_only_mem,515 .enter = psci_system_suspend_enter,516};517 518static void __init psci_init_system_reset2(void)519{520 int ret;521 522 ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2));523 524 if (ret != PSCI_RET_NOT_SUPPORTED)525 psci_system_reset2_supported = true;526}527 528static void __init psci_init_system_suspend(void)529{530 int ret;531 532 if (!IS_ENABLED(CONFIG_SUSPEND))533 return;534 535 ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));536 537 if (ret != PSCI_RET_NOT_SUPPORTED)538 suspend_set_ops(&psci_suspend_ops);539}540 541static void __init psci_init_cpu_suspend(void)542{543 int feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));544 545 if (feature != PSCI_RET_NOT_SUPPORTED)546 psci_cpu_suspend_feature = feature;547}548 549/*550 * Detect the presence of a resident Trusted OS which may cause CPU_OFF to551 * return DENIED (which would be fatal).552 */553static void __init psci_init_migrate(void)554{555 unsigned long cpuid;556 int type, cpu = -1;557 558 type = psci_ops.migrate_info_type();559 560 if (type == PSCI_0_2_TOS_MP) {561 pr_info("Trusted OS migration not required\n");562 return;563 }564 565 if (type == PSCI_RET_NOT_SUPPORTED) {566 pr_info("MIGRATE_INFO_TYPE not supported.\n");567 return;568 }569 570 if (type != PSCI_0_2_TOS_UP_MIGRATE &&571 type != PSCI_0_2_TOS_UP_NO_MIGRATE) {572 pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);573 return;574 }575 576 cpuid = psci_migrate_info_up_cpu();577 if (cpuid & ~MPIDR_HWID_BITMASK) {578 pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",579 cpuid);580 return;581 }582 583 cpu = get_logical_index(cpuid);584 resident_cpu = cpu >= 0 ? cpu : -1;585 586 pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);587}588 589static void __init psci_init_smccc(void)590{591 u32 ver = ARM_SMCCC_VERSION_1_0;592 int feature;593 594 feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);595 596 if (feature != PSCI_RET_NOT_SUPPORTED) {597 u32 ret;598 ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);599 if (ret >= ARM_SMCCC_VERSION_1_1) {600 arm_smccc_version_init(ret, psci_conduit);601 ver = ret;602 }603 }604 605 /*606 * Conveniently, the SMCCC and PSCI versions are encoded the607 * same way. No, this isn't accidental.608 */609 pr_info("SMC Calling Convention v%d.%d\n",610 PSCI_VERSION_MAJOR(ver), PSCI_VERSION_MINOR(ver));611 612}613 614static void __init psci_0_2_set_functions(void)615{616 pr_info("Using standard PSCI v0.2 function IDs\n");617 618 psci_ops = (struct psci_operations){619 .get_version = psci_0_2_get_version,620 .cpu_suspend = psci_0_2_cpu_suspend,621 .cpu_off = psci_0_2_cpu_off,622 .cpu_on = psci_0_2_cpu_on,623 .migrate = psci_0_2_migrate,624 .affinity_info = psci_affinity_info,625 .migrate_info_type = psci_migrate_info_type,626 };627 628 register_restart_handler(&psci_sys_reset_nb);629 630 pm_power_off = psci_sys_poweroff;631}632 633/*634 * Probe function for PSCI firmware versions >= 0.2635 */636static int __init psci_probe(void)637{638 u32 ver = psci_0_2_get_version();639 640 pr_info("PSCIv%d.%d detected in firmware.\n",641 PSCI_VERSION_MAJOR(ver),642 PSCI_VERSION_MINOR(ver));643 644 if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {645 pr_err("Conflicting PSCI version detected.\n");646 return -EINVAL;647 }648 649 psci_0_2_set_functions();650 651 psci_init_migrate();652 653 if (PSCI_VERSION_MAJOR(ver) >= 1) {654 psci_init_smccc();655 psci_init_cpu_suspend();656 psci_init_system_suspend();657 psci_init_system_reset2();658 kvm_init_hyp_services();659 }660 661 return 0;662}663 664typedef int (*psci_initcall_t)(const struct device_node *);665 666/*667 * PSCI init function for PSCI versions >=0.2668 *669 * Probe based on PSCI PSCI_VERSION function670 */671static int __init psci_0_2_init(const struct device_node *np)672{673 int err;674 675 err = get_set_conduit_method(np);676 if (err)677 return err;678 679 /*680 * Starting with v0.2, the PSCI specification introduced a call681 * (PSCI_VERSION) that allows probing the firmware version, so682 * that PSCI function IDs and version specific initialization683 * can be carried out according to the specific version reported684 * by firmware685 */686 return psci_probe();687}688 689/*690 * PSCI < v0.2 get PSCI Function IDs via DT.691 */692static int __init psci_0_1_init(const struct device_node *np)693{694 u32 id;695 int err;696 697 err = get_set_conduit_method(np);698 if (err)699 return err;700 701 pr_info("Using PSCI v0.1 Function IDs from DT\n");702 703 psci_ops.get_version = psci_0_1_get_version;704 705 if (!of_property_read_u32(np, "cpu_suspend", &id)) {706 psci_0_1_function_ids.cpu_suspend = id;707 psci_ops.cpu_suspend = psci_0_1_cpu_suspend;708 }709 710 if (!of_property_read_u32(np, "cpu_off", &id)) {711 psci_0_1_function_ids.cpu_off = id;712 psci_ops.cpu_off = psci_0_1_cpu_off;713 }714 715 if (!of_property_read_u32(np, "cpu_on", &id)) {716 psci_0_1_function_ids.cpu_on = id;717 psci_ops.cpu_on = psci_0_1_cpu_on;718 }719 720 if (!of_property_read_u32(np, "migrate", &id)) {721 psci_0_1_function_ids.migrate = id;722 psci_ops.migrate = psci_0_1_migrate;723 }724 725 return 0;726}727 728static int __init psci_1_0_init(const struct device_node *np)729{730 int err;731 732 err = psci_0_2_init(np);733 if (err)734 return err;735 736 if (psci_has_osi_support()) {737 pr_info("OSI mode supported.\n");738 739 /* Default to PC mode. */740 psci_set_osi_mode(false);741 }742 743 return 0;744}745 746static const struct of_device_id psci_of_match[] __initconst = {747 { .compatible = "arm,psci", .data = psci_0_1_init},748 { .compatible = "arm,psci-0.2", .data = psci_0_2_init},749 { .compatible = "arm,psci-1.0", .data = psci_1_0_init},750 {},751};752 753int __init psci_dt_init(void)754{755 struct device_node *np;756 const struct of_device_id *matched_np;757 psci_initcall_t init_fn;758 int ret;759 760 np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);761 762 if (!np || !of_device_is_available(np))763 return -ENODEV;764 765 init_fn = (psci_initcall_t)matched_np->data;766 ret = init_fn(np);767 768 of_node_put(np);769 return ret;770}771 772#ifdef CONFIG_ACPI773/*774 * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's775 * explicitly clarified in SBBR776 */777int __init psci_acpi_init(void)778{779 if (!acpi_psci_present()) {780 pr_info("is not implemented in ACPI.\n");781 return -EOPNOTSUPP;782 }783 784 pr_info("probing for conduit method from ACPI.\n");785 786 if (acpi_psci_use_hvc())787 set_conduit(SMCCC_CONDUIT_HVC);788 else789 set_conduit(SMCCC_CONDUIT_SMC);790 791 return psci_probe();792}793#endif794