arch/mips/loongson64/pm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * loongson-specific suspend support
   4  *
   5  *  Copyright (C) 2009 Lemote Inc.
   6  *  Author: Wu Zhangjin <wuzhangjin@gmail.com>
   7  */
   8 #include <linux/suspend.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/pm.h>
  11
  12 #include <asm/i8259.h>
  13 #include <asm/mipsregs.h>
  14
  15 #include <loongson.h>
  16
  17 static unsigned int __maybe_unused cached_master_mask;  /* i8259A */
  18 static unsigned int __maybe_unused cached_slave_mask;
  19 static unsigned int __maybe_unused cached_bonito_irq_mask; /* bonito */
  20
  21 void arch_suspend_disable_irqs(void)
  22 {
  23         /* disable all mips events */
  24         local_irq_disable();
  25
  26 #ifdef CONFIG_I8259
  27         /* disable all events of i8259A */
  28         cached_slave_mask = inb(PIC_SLAVE_IMR);
  29         cached_master_mask = inb(PIC_MASTER_IMR);
  30
  31         outb(0xff, PIC_SLAVE_IMR);
  32         inb(PIC_SLAVE_IMR);
  33         outb(0xff, PIC_MASTER_IMR);
  34         inb(PIC_MASTER_IMR);
  35 #endif
  36         /* disable all events of bonito */
  37         cached_bonito_irq_mask = LOONGSON_INTEN;
  38         LOONGSON_INTENCLR = 0xffff;
  39         (void)LOONGSON_INTENCLR;
  40 }
  41
  42 void arch_suspend_enable_irqs(void)
  43 {
  44         /* enable all mips events */
  45         local_irq_enable();
  46 #ifdef CONFIG_I8259
  47         /* only enable the cached events of i8259A */
  48         outb(cached_slave_mask, PIC_SLAVE_IMR);
  49         outb(cached_master_mask, PIC_MASTER_IMR);
  50 #endif
  51         /* enable all cached events of bonito */
  52         LOONGSON_INTENSET = cached_bonito_irq_mask;
  53         (void)LOONGSON_INTENSET;
  54 }
  55
  56 /*
  57  * Setup the board-specific events for waking up loongson from wait mode
  58  */
  59 void __weak setup_wakeup_events(void)
  60 {
  61 }
  62
  63 void __weak mach_suspend(void)
  64 {
  65 }
  66
  67 void __weak mach_resume(void)
  68 {
  69 }
  70
  71 static int loongson_pm_enter(suspend_state_t state)
  72 {
  73         mach_suspend();
  74
  75         mach_resume();
  76
  77         return 0;
  78 }
  79
  80 static int loongson_pm_valid_state(suspend_state_t state)
  81 {
  82         switch (state) {
  83         case PM_SUSPEND_ON:
  84         case PM_SUSPEND_STANDBY:
  85         case PM_SUSPEND_MEM:
  86                 return 1;
  87
  88         default:
  89                 return 0;
  90         }
  91 }
  92
  93 static const struct platform_suspend_ops loongson_pm_ops = {
  94         .valid  = loongson_pm_valid_state,
  95         .enter  = loongson_pm_enter,
  96 };
  97
  98 static int __init loongson_pm_init(void)
  99 {
 100         suspend_set_ops(&loongson_pm_ops);
 101
 102         return 0;
 103 }
 104 arch_initcall(loongson_pm_init);