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635 lines
14 KiB
635 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* |
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* Copyright (C) 2015 ARM Limited |
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*/ |
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|
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#define pr_fmt(fmt) "psci: " fmt |
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|
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#include <linux/acpi.h> |
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#include <linux/arm-smccc.h> |
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#include <linux/cpuidle.h> |
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#include <linux/errno.h> |
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#include <linux/linkage.h> |
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#include <linux/of.h> |
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#include <linux/pm.h> |
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#include <linux/printk.h> |
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#include <linux/psci.h> |
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#include <linux/reboot.h> |
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#include <linux/slab.h> |
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#include <linux/suspend.h> |
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#include <uapi/linux/psci.h> |
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#include <asm/cpuidle.h> |
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#include <asm/cputype.h> |
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#include <asm/system_misc.h> |
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#include <asm/smp_plat.h> |
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#include <asm/suspend.h> |
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/* |
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* While a 64-bit OS can make calls with SMC32 calling conventions, for some |
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* calls it is necessary to use SMC64 to pass or return 64-bit values. |
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* For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate |
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* (native-width) function ID. |
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*/ |
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#ifdef CONFIG_64BIT |
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#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name |
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#else |
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#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name |
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#endif |
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/* |
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* The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF |
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* calls to its resident CPU, so we must avoid issuing those. We never migrate |
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* a Trusted OS even if it claims to be capable of migration -- doing so will |
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* require cooperation with a Trusted OS driver. |
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*/ |
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static int resident_cpu = -1; |
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struct psci_operations psci_ops; |
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static enum arm_smccc_conduit psci_conduit = SMCCC_CONDUIT_NONE; |
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bool psci_tos_resident_on(int cpu) |
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{ |
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return cpu == resident_cpu; |
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} |
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typedef unsigned long (psci_fn)(unsigned long, unsigned long, |
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unsigned long, unsigned long); |
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static psci_fn *invoke_psci_fn; |
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static struct psci_0_1_function_ids psci_0_1_function_ids; |
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struct psci_0_1_function_ids get_psci_0_1_function_ids(void) |
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{ |
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return psci_0_1_function_ids; |
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} |
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#define PSCI_0_2_POWER_STATE_MASK \ |
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(PSCI_0_2_POWER_STATE_ID_MASK | \ |
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PSCI_0_2_POWER_STATE_TYPE_MASK | \ |
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PSCI_0_2_POWER_STATE_AFFL_MASK) |
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#define PSCI_1_0_EXT_POWER_STATE_MASK \ |
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(PSCI_1_0_EXT_POWER_STATE_ID_MASK | \ |
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PSCI_1_0_EXT_POWER_STATE_TYPE_MASK) |
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static u32 psci_cpu_suspend_feature; |
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static bool psci_system_reset2_supported; |
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static inline bool psci_has_ext_power_state(void) |
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{ |
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return psci_cpu_suspend_feature & |
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PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK; |
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} |
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bool psci_has_osi_support(void) |
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{ |
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return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED; |
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} |
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static inline bool psci_power_state_loses_context(u32 state) |
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{ |
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const u32 mask = psci_has_ext_power_state() ? |
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PSCI_1_0_EXT_POWER_STATE_TYPE_MASK : |
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PSCI_0_2_POWER_STATE_TYPE_MASK; |
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return state & mask; |
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} |
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bool psci_power_state_is_valid(u32 state) |
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{ |
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const u32 valid_mask = psci_has_ext_power_state() ? |
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PSCI_1_0_EXT_POWER_STATE_MASK : |
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PSCI_0_2_POWER_STATE_MASK; |
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return !(state & ~valid_mask); |
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} |
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static unsigned long __invoke_psci_fn_hvc(unsigned long function_id, |
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unsigned long arg0, unsigned long arg1, |
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unsigned long arg2) |
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{ |
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struct arm_smccc_res res; |
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arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); |
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return res.a0; |
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} |
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static unsigned long __invoke_psci_fn_smc(unsigned long function_id, |
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unsigned long arg0, unsigned long arg1, |
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unsigned long arg2) |
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{ |
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struct arm_smccc_res res; |
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arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); |
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return res.a0; |
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} |
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static int psci_to_linux_errno(int errno) |
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{ |
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switch (errno) { |
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case PSCI_RET_SUCCESS: |
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return 0; |
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case PSCI_RET_NOT_SUPPORTED: |
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return -EOPNOTSUPP; |
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case PSCI_RET_INVALID_PARAMS: |
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case PSCI_RET_INVALID_ADDRESS: |
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return -EINVAL; |
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case PSCI_RET_DENIED: |
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return -EPERM; |
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}; |
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return -EINVAL; |
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} |
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static u32 psci_0_1_get_version(void) |
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{ |
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return PSCI_VERSION(0, 1); |
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} |
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static u32 psci_0_2_get_version(void) |
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{ |
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return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0); |
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} |
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int psci_set_osi_mode(bool enable) |
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{ |
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unsigned long suspend_mode; |
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int err; |
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suspend_mode = enable ? PSCI_1_0_SUSPEND_MODE_OSI : |
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PSCI_1_0_SUSPEND_MODE_PC; |
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err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0); |
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return psci_to_linux_errno(err); |
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} |
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static int __psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point) |
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{ |
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int err; |
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err = invoke_psci_fn(fn, state, entry_point, 0); |
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return psci_to_linux_errno(err); |
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} |
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static int psci_0_1_cpu_suspend(u32 state, unsigned long entry_point) |
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{ |
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return __psci_cpu_suspend(psci_0_1_function_ids.cpu_suspend, |
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state, entry_point); |
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} |
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static int psci_0_2_cpu_suspend(u32 state, unsigned long entry_point) |
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{ |
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return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND), |
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state, entry_point); |
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} |
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static int __psci_cpu_off(u32 fn, u32 state) |
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{ |
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int err; |
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err = invoke_psci_fn(fn, state, 0, 0); |
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return psci_to_linux_errno(err); |
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} |
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static int psci_0_1_cpu_off(u32 state) |
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{ |
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return __psci_cpu_off(psci_0_1_function_ids.cpu_off, state); |
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} |
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static int psci_0_2_cpu_off(u32 state) |
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{ |
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return __psci_cpu_off(PSCI_0_2_FN_CPU_OFF, state); |
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} |
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static int __psci_cpu_on(u32 fn, unsigned long cpuid, unsigned long entry_point) |
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{ |
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int err; |
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err = invoke_psci_fn(fn, cpuid, entry_point, 0); |
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return psci_to_linux_errno(err); |
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} |
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static int psci_0_1_cpu_on(unsigned long cpuid, unsigned long entry_point) |
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{ |
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return __psci_cpu_on(psci_0_1_function_ids.cpu_on, cpuid, entry_point); |
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} |
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static int psci_0_2_cpu_on(unsigned long cpuid, unsigned long entry_point) |
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{ |
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return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point); |
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} |
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static int __psci_migrate(u32 fn, unsigned long cpuid) |
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{ |
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int err; |
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err = invoke_psci_fn(fn, cpuid, 0, 0); |
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return psci_to_linux_errno(err); |
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} |
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static int psci_0_1_migrate(unsigned long cpuid) |
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{ |
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return __psci_migrate(psci_0_1_function_ids.migrate, cpuid); |
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} |
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static int psci_0_2_migrate(unsigned long cpuid) |
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{ |
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return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid); |
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} |
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static int psci_affinity_info(unsigned long target_affinity, |
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unsigned long lowest_affinity_level) |
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{ |
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return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO), |
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target_affinity, lowest_affinity_level, 0); |
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} |
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static int psci_migrate_info_type(void) |
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{ |
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return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0); |
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} |
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static unsigned long psci_migrate_info_up_cpu(void) |
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{ |
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return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU), |
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0, 0, 0); |
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} |
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static void set_conduit(enum arm_smccc_conduit conduit) |
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{ |
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switch (conduit) { |
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case SMCCC_CONDUIT_HVC: |
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invoke_psci_fn = __invoke_psci_fn_hvc; |
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break; |
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case SMCCC_CONDUIT_SMC: |
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invoke_psci_fn = __invoke_psci_fn_smc; |
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break; |
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default: |
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WARN(1, "Unexpected PSCI conduit %d\n", conduit); |
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} |
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psci_conduit = conduit; |
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} |
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static int get_set_conduit_method(struct device_node *np) |
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{ |
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const char *method; |
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pr_info("probing for conduit method from DT.\n"); |
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if (of_property_read_string(np, "method", &method)) { |
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pr_warn("missing \"method\" property\n"); |
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return -ENXIO; |
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} |
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if (!strcmp("hvc", method)) { |
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set_conduit(SMCCC_CONDUIT_HVC); |
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} else if (!strcmp("smc", method)) { |
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set_conduit(SMCCC_CONDUIT_SMC); |
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} else { |
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pr_warn("invalid \"method\" property: %s\n", method); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd) |
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{ |
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if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) && |
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psci_system_reset2_supported) { |
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/* |
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* reset_type[31] = 0 (architectural) |
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* reset_type[30:0] = 0 (SYSTEM_WARM_RESET) |
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* cookie = 0 (ignored by the implementation) |
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*/ |
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invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0); |
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} else { |
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0); |
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} |
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} |
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static void psci_sys_poweroff(void) |
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{ |
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); |
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} |
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static int __init psci_features(u32 psci_func_id) |
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{ |
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return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES, |
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psci_func_id, 0, 0); |
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} |
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#ifdef CONFIG_CPU_IDLE |
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static int psci_suspend_finisher(unsigned long state) |
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{ |
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u32 power_state = state; |
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return psci_ops.cpu_suspend(power_state, __pa_symbol(cpu_resume)); |
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} |
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int psci_cpu_suspend_enter(u32 state) |
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{ |
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int ret; |
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if (!psci_power_state_loses_context(state)) |
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ret = psci_ops.cpu_suspend(state, 0); |
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else |
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ret = cpu_suspend(state, psci_suspend_finisher); |
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return ret; |
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} |
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#endif |
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static int psci_system_suspend(unsigned long unused) |
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{ |
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return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND), |
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__pa_symbol(cpu_resume), 0, 0); |
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} |
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static int psci_system_suspend_enter(suspend_state_t state) |
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{ |
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return cpu_suspend(0, psci_system_suspend); |
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} |
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static const struct platform_suspend_ops psci_suspend_ops = { |
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.valid = suspend_valid_only_mem, |
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.enter = psci_system_suspend_enter, |
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}; |
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static void __init psci_init_system_reset2(void) |
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{ |
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int ret; |
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ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2)); |
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if (ret != PSCI_RET_NOT_SUPPORTED) |
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psci_system_reset2_supported = true; |
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} |
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static void __init psci_init_system_suspend(void) |
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{ |
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int ret; |
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if (!IS_ENABLED(CONFIG_SUSPEND)) |
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return; |
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ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND)); |
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if (ret != PSCI_RET_NOT_SUPPORTED) |
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suspend_set_ops(&psci_suspend_ops); |
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} |
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static void __init psci_init_cpu_suspend(void) |
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{ |
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int feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND)); |
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if (feature != PSCI_RET_NOT_SUPPORTED) |
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psci_cpu_suspend_feature = feature; |
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} |
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/* |
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* Detect the presence of a resident Trusted OS which may cause CPU_OFF to |
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* return DENIED (which would be fatal). |
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*/ |
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static void __init psci_init_migrate(void) |
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{ |
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unsigned long cpuid; |
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int type, cpu = -1; |
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type = psci_ops.migrate_info_type(); |
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if (type == PSCI_0_2_TOS_MP) { |
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pr_info("Trusted OS migration not required\n"); |
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return; |
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} |
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if (type == PSCI_RET_NOT_SUPPORTED) { |
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pr_info("MIGRATE_INFO_TYPE not supported.\n"); |
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return; |
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} |
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if (type != PSCI_0_2_TOS_UP_MIGRATE && |
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type != PSCI_0_2_TOS_UP_NO_MIGRATE) { |
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pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type); |
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return; |
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} |
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cpuid = psci_migrate_info_up_cpu(); |
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if (cpuid & ~MPIDR_HWID_BITMASK) { |
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pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n", |
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cpuid); |
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return; |
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} |
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cpu = get_logical_index(cpuid); |
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resident_cpu = cpu >= 0 ? cpu : -1; |
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pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid); |
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} |
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static void __init psci_init_smccc(void) |
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{ |
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u32 ver = ARM_SMCCC_VERSION_1_0; |
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int feature; |
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feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID); |
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if (feature != PSCI_RET_NOT_SUPPORTED) { |
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u32 ret; |
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ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0); |
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if (ret >= ARM_SMCCC_VERSION_1_1) { |
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arm_smccc_version_init(ret, psci_conduit); |
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ver = ret; |
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} |
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} |
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/* |
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* Conveniently, the SMCCC and PSCI versions are encoded the |
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* same way. No, this isn't accidental. |
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*/ |
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pr_info("SMC Calling Convention v%d.%d\n", |
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PSCI_VERSION_MAJOR(ver), PSCI_VERSION_MINOR(ver)); |
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} |
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static void __init psci_0_2_set_functions(void) |
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{ |
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pr_info("Using standard PSCI v0.2 function IDs\n"); |
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psci_ops = (struct psci_operations){ |
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.get_version = psci_0_2_get_version, |
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.cpu_suspend = psci_0_2_cpu_suspend, |
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.cpu_off = psci_0_2_cpu_off, |
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.cpu_on = psci_0_2_cpu_on, |
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.migrate = psci_0_2_migrate, |
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.affinity_info = psci_affinity_info, |
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.migrate_info_type = psci_migrate_info_type, |
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}; |
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arm_pm_restart = psci_sys_reset; |
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pm_power_off = psci_sys_poweroff; |
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} |
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/* |
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* Probe function for PSCI firmware versions >= 0.2 |
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*/ |
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static int __init psci_probe(void) |
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{ |
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u32 ver = psci_0_2_get_version(); |
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pr_info("PSCIv%d.%d detected in firmware.\n", |
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PSCI_VERSION_MAJOR(ver), |
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PSCI_VERSION_MINOR(ver)); |
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if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) { |
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pr_err("Conflicting PSCI version detected.\n"); |
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return -EINVAL; |
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} |
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psci_0_2_set_functions(); |
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psci_init_migrate(); |
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if (PSCI_VERSION_MAJOR(ver) >= 1) { |
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psci_init_smccc(); |
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psci_init_cpu_suspend(); |
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psci_init_system_suspend(); |
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psci_init_system_reset2(); |
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} |
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return 0; |
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} |
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typedef int (*psci_initcall_t)(const struct device_node *); |
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|
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/* |
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* PSCI init function for PSCI versions >=0.2 |
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* |
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* Probe based on PSCI PSCI_VERSION function |
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*/ |
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static int __init psci_0_2_init(struct device_node *np) |
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{ |
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int err; |
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err = get_set_conduit_method(np); |
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if (err) |
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return err; |
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/* |
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* Starting with v0.2, the PSCI specification introduced a call |
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* (PSCI_VERSION) that allows probing the firmware version, so |
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* that PSCI function IDs and version specific initialization |
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* can be carried out according to the specific version reported |
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* by firmware |
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*/ |
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return psci_probe(); |
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} |
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|
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/* |
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* PSCI < v0.2 get PSCI Function IDs via DT. |
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*/ |
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static int __init psci_0_1_init(struct device_node *np) |
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{ |
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u32 id; |
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int err; |
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err = get_set_conduit_method(np); |
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if (err) |
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return err; |
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pr_info("Using PSCI v0.1 Function IDs from DT\n"); |
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psci_ops.get_version = psci_0_1_get_version; |
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if (!of_property_read_u32(np, "cpu_suspend", &id)) { |
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psci_0_1_function_ids.cpu_suspend = id; |
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psci_ops.cpu_suspend = psci_0_1_cpu_suspend; |
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} |
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if (!of_property_read_u32(np, "cpu_off", &id)) { |
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psci_0_1_function_ids.cpu_off = id; |
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psci_ops.cpu_off = psci_0_1_cpu_off; |
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} |
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if (!of_property_read_u32(np, "cpu_on", &id)) { |
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psci_0_1_function_ids.cpu_on = id; |
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psci_ops.cpu_on = psci_0_1_cpu_on; |
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} |
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if (!of_property_read_u32(np, "migrate", &id)) { |
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psci_0_1_function_ids.migrate = id; |
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psci_ops.migrate = psci_0_1_migrate; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int __init psci_1_0_init(struct device_node *np) |
|
{ |
|
int err; |
|
|
|
err = psci_0_2_init(np); |
|
if (err) |
|
return err; |
|
|
|
if (psci_has_osi_support()) { |
|
pr_info("OSI mode supported.\n"); |
|
|
|
/* Default to PC mode. */ |
|
psci_set_osi_mode(false); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static const struct of_device_id psci_of_match[] __initconst = { |
|
{ .compatible = "arm,psci", .data = psci_0_1_init}, |
|
{ .compatible = "arm,psci-0.2", .data = psci_0_2_init}, |
|
{ .compatible = "arm,psci-1.0", .data = psci_1_0_init}, |
|
{}, |
|
}; |
|
|
|
int __init psci_dt_init(void) |
|
{ |
|
struct device_node *np; |
|
const struct of_device_id *matched_np; |
|
psci_initcall_t init_fn; |
|
int ret; |
|
|
|
np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np); |
|
|
|
if (!np || !of_device_is_available(np)) |
|
return -ENODEV; |
|
|
|
init_fn = (psci_initcall_t)matched_np->data; |
|
ret = init_fn(np); |
|
|
|
of_node_put(np); |
|
return ret; |
|
} |
|
|
|
#ifdef CONFIG_ACPI |
|
/* |
|
* We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's |
|
* explicitly clarified in SBBR |
|
*/ |
|
int __init psci_acpi_init(void) |
|
{ |
|
if (!acpi_psci_present()) { |
|
pr_info("is not implemented in ACPI.\n"); |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
pr_info("probing for conduit method from ACPI.\n"); |
|
|
|
if (acpi_psci_use_hvc()) |
|
set_conduit(SMCCC_CONDUIT_HVC); |
|
else |
|
set_conduit(SMCCC_CONDUIT_SMC); |
|
|
|
return psci_probe(); |
|
} |
|
#endif
|
|
|