MIPS: Loongson: Change the Email address of Wu Zhangjin
[kernel.git] / arch / mips / loongson / common / pm.c
1 /*
2  * loongson-specific suspend support
3  *
4  *  Copyright (C) 2009 Lemote Inc.
5  *  Author: Wu Zhangjin <wuzhangjin@gmail.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  */
12 #include <linux/suspend.h>
13 #include <linux/interrupt.h>
14 #include <linux/pm.h>
15
16 #include <asm/i8259.h>
17 #include <asm/mipsregs.h>
18
19 #include <loongson.h>
20
21 static unsigned int __maybe_unused cached_master_mask;  /* i8259A */
22 static unsigned int __maybe_unused cached_slave_mask;
23 static unsigned int __maybe_unused cached_bonito_irq_mask; /* bonito */
24
25 void arch_suspend_disable_irqs(void)
26 {
27         /* disable all mips events */
28         local_irq_disable();
29
30 #ifdef CONFIG_I8259
31         /* disable all events of i8259A */
32         cached_slave_mask = inb(PIC_SLAVE_IMR);
33         cached_master_mask = inb(PIC_MASTER_IMR);
34
35         outb(0xff, PIC_SLAVE_IMR);
36         inb(PIC_SLAVE_IMR);
37         outb(0xff, PIC_MASTER_IMR);
38         inb(PIC_MASTER_IMR);
39 #endif
40         /* disable all events of bonito */
41         cached_bonito_irq_mask = LOONGSON_INTEN;
42         LOONGSON_INTENCLR = 0xffff;
43         (void)LOONGSON_INTENCLR;
44 }
45
46 void arch_suspend_enable_irqs(void)
47 {
48         /* enable all mips events */
49         local_irq_enable();
50 #ifdef CONFIG_I8259
51         /* only enable the cached events of i8259A */
52         outb(cached_slave_mask, PIC_SLAVE_IMR);
53         outb(cached_master_mask, PIC_MASTER_IMR);
54 #endif
55         /* enable all cached events of bonito */
56         LOONGSON_INTENSET = cached_bonito_irq_mask;
57         (void)LOONGSON_INTENSET;
58 }
59
60 /*
61  * Setup the board-specific events for waking up loongson from wait mode
62  */
63 void __weak setup_wakeup_events(void)
64 {
65 }
66
67 /*
68  * Check wakeup events
69  */
70 int __weak wakeup_loongson(void)
71 {
72         return 1;
73 }
74
75 /*
76  * If the events are really what we want to wakeup the CPU, wake it up
77  * otherwise put the CPU asleep again.
78  */
79 static void wait_for_wakeup_events(void)
80 {
81         while (!wakeup_loongson())
82                 LOONGSON_CHIPCFG0 &= ~0x7;
83 }
84
85 /*
86  * Stop all perf counters
87  *
88  * $24 is the control register of Loongson perf counter
89  */
90 static inline void stop_perf_counters(void)
91 {
92         __write_64bit_c0_register($24, 0, 0);
93 }
94
95
96 static void loongson_suspend_enter(void)
97 {
98         static unsigned int cached_cpu_freq;
99
100         /* setup wakeup events via enabling the IRQs */
101         setup_wakeup_events();
102
103         stop_perf_counters();
104
105         cached_cpu_freq = LOONGSON_CHIPCFG0;
106
107         /* Put CPU into wait mode */
108         LOONGSON_CHIPCFG0 &= ~0x7;
109
110         /* wait for the given events to wakeup cpu from wait mode */
111         wait_for_wakeup_events();
112
113         LOONGSON_CHIPCFG0 = cached_cpu_freq;
114         mmiowb();
115 }
116
117 void __weak mach_suspend(void)
118 {
119 }
120
121 void __weak mach_resume(void)
122 {
123 }
124
125 static int loongson_pm_enter(suspend_state_t state)
126 {
127         mach_suspend();
128
129         /* processor specific suspend */
130         loongson_suspend_enter();
131
132         mach_resume();
133
134         return 0;
135 }
136
137 static int loongson_pm_valid_state(suspend_state_t state)
138 {
139         switch (state) {
140         case PM_SUSPEND_ON:
141         case PM_SUSPEND_STANDBY:
142         case PM_SUSPEND_MEM:
143                 return 1;
144
145         default:
146                 return 0;
147         }
148 }
149
150 static struct platform_suspend_ops loongson_pm_ops = {
151         .valid  = loongson_pm_valid_state,
152         .enter  = loongson_pm_enter,
153 };
154
155 static int __init loongson_pm_init(void)
156 {
157         suspend_set_ops(&loongson_pm_ops);
158
159         return 0;
160 }
161 arch_initcall(loongson_pm_init);