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); 105