1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/proc_fs.h>
#include <linux/kernel.h>
#include <linux/suspend.h>
#include <linux/clk.h>
#include <linux/cpufreq.h>
#include <mach/hardware.h>
static struct cpu_wp *cpu_wp_tbl;
static struct clk *cpu_clk;
#if defined(CONFIG_CPU_FREQ)
static int org_freq;
extern int cpufreq_suspended;
extern int set_cpu_freq(int wp);
#endif
static int mx37_suspend_enter(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_MEM:
mxc_cpu_lp_set(STOP_POWER_OFF);
break;
case PM_SUSPEND_STANDBY:
mxc_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
break;
default:
return -EINVAL;
}
if (tzic_enable_wake(0) != 0)
return -EAGAIN;
cpu_do_idle();
return 0;
}
/*
* Called after processes are frozen, but before we shut down devices.
*/
static int mx37_suspend_prepare(void)
{
#if defined(CONFIG_CPU_FREQ)
struct cpufreq_freqs freqs;
org_freq = clk_get_rate(cpu_clk);
freqs.old = org_freq / 1000;
freqs.new = cpu_wp_tbl[0].cpu_rate / 1000;
freqs.cpu = 0;
freqs.flags = 0;
cpufreq_suspended = 1;
if (clk_get_rate(cpu_clk) != cpu_wp_tbl[0].cpu_rate) {
set_cpu_freq(cpu_wp_tbl[0].cpu_rate);
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
}
#endif
return 0;
}
/*
* Called after devices are re-setup, but before processes are thawed.
*/
static void mx37_suspend_finish(void)
{
#if defined(CONFIG_CPU_FREQ)
struct cpufreq_freqs freqs;
freqs.old = clk_get_rate(cpu_clk) / 1000;
freqs.new = org_freq / 1000;
freqs.cpu = 0;
freqs.flags = 0;
cpufreq_suspended = 0;
if (org_freq != clk_get_rate(cpu_clk)) {
set_cpu_freq(org_freq);
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
}
#endif
}
static int mx37_pm_valid(suspend_state_t state)
{
return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
}
struct platform_suspend_ops mx37_suspend_ops = {
.valid = mx37_pm_valid,
.prepare = mx37_suspend_prepare,
.enter = mx37_suspend_enter,
.finish = mx37_suspend_finish,
};
static int __init mx37_pm_init(void)
{
int cpu_wp_nr;
pr_info("Static Power Management for Freescale i.MX37\n");
suspend_set_ops(&mx37_suspend_ops);
cpu_wp_tbl = get_cpu_wp(&cpu_wp_nr);
cpu_clk = clk_get(NULL, "cpu_clk");
if (IS_ERR(cpu_clk)) {
printk(KERN_DEBUG "%s: failed to get cpu_clk\n", __func__);
return PTR_ERR(cpu_clk);
}
return 0;
}
late_initcall(mx37_pm_init);
|
