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64909882 G |
1 | /* |
2 | * linux/arch/unicore32/kernel/pm.c | |
3 | * | |
4 | * Code specific to PKUnity SoC and UniCore ISA | |
5 | * | |
6 | * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn> | |
7 | * Copyright (C) 2001-2010 Guan Xuetao | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/suspend.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/io.h> | |
19 | ||
20 | #include <mach/hardware.h> | |
21 | #include <mach/pm.h> | |
22 | ||
23 | #include "setup.h" | |
24 | ||
25 | struct puv3_cpu_pm_fns *puv3_cpu_pm_fns; | |
26 | static unsigned long *sleep_save; | |
27 | ||
28 | int puv3_pm_enter(suspend_state_t state) | |
29 | { | |
30 | unsigned long sleep_save_checksum = 0, checksum = 0; | |
31 | int i; | |
32 | ||
33 | /* skip registers saving for standby */ | |
34 | if (state != PM_SUSPEND_STANDBY) { | |
35 | puv3_cpu_pm_fns->save(sleep_save); | |
36 | /* before sleeping, calculate and save a checksum */ | |
37 | for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++) | |
38 | sleep_save_checksum += sleep_save[i]; | |
39 | } | |
40 | ||
41 | /* *** go zzz *** */ | |
42 | puv3_cpu_pm_fns->enter(state); | |
43 | cpu_init(); | |
44 | #ifdef CONFIG_INPUT_KEYBOARD | |
45 | puv3_ps2_init(); | |
46 | #endif | |
47 | #ifdef CONFIG_PCI | |
48 | pci_puv3_preinit(); | |
49 | #endif | |
50 | if (state != PM_SUSPEND_STANDBY) { | |
51 | /* after sleeping, validate the checksum */ | |
52 | for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++) | |
53 | checksum += sleep_save[i]; | |
54 | ||
55 | /* if invalid, display message and wait for a hardware reset */ | |
56 | if (checksum != sleep_save_checksum) { | |
57 | while (1) | |
58 | puv3_cpu_pm_fns->enter(state); | |
59 | } | |
60 | puv3_cpu_pm_fns->restore(sleep_save); | |
61 | } | |
62 | ||
63 | pr_debug("*** made it back from resume\n"); | |
64 | ||
65 | return 0; | |
66 | } | |
67 | EXPORT_SYMBOL_GPL(puv3_pm_enter); | |
68 | ||
69 | unsigned long sleep_phys_sp(void *sp) | |
70 | { | |
71 | return virt_to_phys(sp); | |
72 | } | |
73 | ||
74 | static int puv3_pm_valid(suspend_state_t state) | |
75 | { | |
76 | if (puv3_cpu_pm_fns) | |
77 | return puv3_cpu_pm_fns->valid(state); | |
78 | ||
79 | return -EINVAL; | |
80 | } | |
81 | ||
82 | static int puv3_pm_prepare(void) | |
83 | { | |
84 | int ret = 0; | |
85 | ||
86 | if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->prepare) | |
87 | ret = puv3_cpu_pm_fns->prepare(); | |
88 | ||
89 | return ret; | |
90 | } | |
91 | ||
92 | static void puv3_pm_finish(void) | |
93 | { | |
94 | if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->finish) | |
95 | puv3_cpu_pm_fns->finish(); | |
96 | } | |
97 | ||
98 | static struct platform_suspend_ops puv3_pm_ops = { | |
99 | .valid = puv3_pm_valid, | |
100 | .enter = puv3_pm_enter, | |
101 | .prepare = puv3_pm_prepare, | |
102 | .finish = puv3_pm_finish, | |
103 | }; | |
104 | ||
105 | static int __init puv3_pm_init(void) | |
106 | { | |
107 | if (!puv3_cpu_pm_fns) { | |
108 | printk(KERN_ERR "no valid puv3_cpu_pm_fns defined\n"); | |
109 | return -EINVAL; | |
110 | } | |
111 | ||
112 | sleep_save = kmalloc(puv3_cpu_pm_fns->save_count | |
113 | * sizeof(unsigned long), GFP_KERNEL); | |
114 | if (!sleep_save) { | |
115 | printk(KERN_ERR "failed to alloc memory for pm save\n"); | |
116 | return -ENOMEM; | |
117 | } | |
118 | ||
119 | suspend_set_ops(&puv3_pm_ops); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | device_initcall(puv3_pm_init); |