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Linux/arch/mips/kernel/pm.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * Copyright (C) 2014 Imagination Technologies Ltd.
  4  *
  5  * CPU PM notifiers for saving/restoring general CPU state.
  6  */
  7 
  8 #include <linux/cpu_pm.h>
  9 #include <linux/init.h>
 10 
 11 #include <asm/dsp.h>
 12 #include <asm/fpu.h>
 13 #include <asm/mmu_context.h>
 14 #include <asm/pm.h>
 15 #include <asm/watch.h>
 16 
 17 /* Used by PM helper macros in asm/pm.h */
 18 struct mips_static_suspend_state mips_static_suspend_state;
 19 
 20 /**
 21  * mips_cpu_save() - Save general CPU state.
 22  * Ensures that general CPU context is saved, notably FPU and DSP.
 23  */
 24 static int mips_cpu_save(void)
 25 {
 26         /* Save FPU state */
 27         lose_fpu(1);
 28 
 29         /* Save DSP state */
 30         save_dsp(current);
 31 
 32         return 0;
 33 }
 34 
 35 /**
 36  * mips_cpu_restore() - Restore general CPU state.
 37  * Restores important CPU context.
 38  */
 39 static void mips_cpu_restore(void)
 40 {
 41         unsigned int cpu = smp_processor_id();
 42 
 43         /* Restore ASID */
 44         if (current->mm)
 45                 write_c0_entryhi(cpu_asid(cpu, current->mm));
 46 
 47         /* Restore DSP state */
 48         restore_dsp(current);
 49 
 50         /* Restore UserLocal */
 51         if (cpu_has_userlocal)
 52                 write_c0_userlocal(current_thread_info()->tp_value);
 53 
 54         /* Restore watch registers */
 55         __restore_watch(current);
 56 }
 57 
 58 /**
 59  * mips_pm_notifier() - Notifier for preserving general CPU context.
 60  * @self:       Notifier block.
 61  * @cmd:        CPU PM event.
 62  * @v:          Private data (unused).
 63  *
 64  * This is called when a CPU power management event occurs, and is used to
 65  * ensure that important CPU context is preserved across a CPU power down.
 66  */
 67 static int mips_pm_notifier(struct notifier_block *self, unsigned long cmd,
 68                             void *v)
 69 {
 70         int ret;
 71 
 72         switch (cmd) {
 73         case CPU_PM_ENTER:
 74                 ret = mips_cpu_save();
 75                 if (ret)
 76                         return NOTIFY_STOP;
 77                 break;
 78         case CPU_PM_ENTER_FAILED:
 79         case CPU_PM_EXIT:
 80                 mips_cpu_restore();
 81                 break;
 82         }
 83 
 84         return NOTIFY_OK;
 85 }
 86 
 87 static struct notifier_block mips_pm_notifier_block = {
 88         .notifier_call = mips_pm_notifier,
 89 };
 90 
 91 static int __init mips_pm_init(void)
 92 {
 93         return cpu_pm_register_notifier(&mips_pm_notifier_block);
 94 }
 95 arch_initcall(mips_pm_init);
 96 

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