aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mach-omap2/pm.c
blob: 562168fa2b163a277dcb60c7fa730994b831d7d3 (plain)
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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/*
 * linux/arch/arm/mach-omap2/pm.c
 *
 * OMAP2 Power Management Routines
 *
 * Copyright (C) 2006 Nokia Corporation
 * Tony Lindgren <tony@atomide.com>
 *
 * Copyright (C) 2005 Texas Instruments, Inc.
 * Richard Woodruff <r-woodruff2@ti.com>
 *
 * Based on pm.c for omap1
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/pm.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/pm.h>
#include <linux/interrupt.h>
#include <linux/sysfs.h>
#include <linux/module.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/atomic.h>
#include <asm/mach/time.h>
#include <asm/mach/irq.h>
#include <asm/mach-types.h>

#include <asm/arch/irqs.h>
#include <asm/arch/clock.h>
#include <asm/arch/sram.h>
#include <asm/arch/pm.h>

static struct clk *vclk;
static void (*omap2_sram_idle)(void);
static void (*omap2_sram_suspend)(int dllctrl, int cpu_rev);
static void (*saved_idle)(void);

void omap2_pm_idle(void)
{
	local_irq_disable();
	local_fiq_disable();
	if (need_resched()) {
		local_fiq_enable();
		local_irq_enable();
		return;
	}

	/*
	 * Since an interrupt may set up a timer, we don't want to
	 * reprogram the hardware timer with interrupts enabled.
	 * Re-enable interrupts only after returning from idle.
	 */
	timer_dyn_reprogram();

	omap2_sram_idle();
	local_fiq_enable();
	local_irq_enable();
}

static int omap2_pm_prepare(suspend_state_t state)
{
	int error = 0;

	/* We cannot sleep in idle until we have resumed */
	saved_idle = pm_idle;
	pm_idle = NULL;

	switch (state)
	{
	case PM_SUSPEND_STANDBY:
	case PM_SUSPEND_MEM:
		break;

	case PM_SUSPEND_DISK:
		return -ENOTSUPP;

	default:
		return -EINVAL;
	}

	return error;
}

static int omap2_pm_enter(suspend_state_t state)
{
	switch (state)
	{
	case PM_SUSPEND_STANDBY:
	case PM_SUSPEND_MEM:
		/* FIXME: Add suspend */
		break;

	case PM_SUSPEND_DISK:
		return -ENOTSUPP;

	default:
		return -EINVAL;
	}

	return 0;
}

static int omap2_pm_finish(suspend_state_t state)
{
	pm_idle = saved_idle;
	return 0;
}

static struct pm_ops omap_pm_ops = {
	.pm_disk_mode	= 0,
	.prepare	= omap2_pm_prepare,
	.enter		= omap2_pm_enter,
	.finish		= omap2_pm_finish,
};

int __init omap2_pm_init(void)
{
	printk("Power Management for TI OMAP.\n");

	vclk = clk_get(NULL, "virt_prcm_set");
	if (IS_ERR(vclk)) {
		printk(KERN_ERR "Could not get PM vclk\n");
		return -ENODEV;
	}

	/*
	 * We copy the assembler sleep/wakeup routines to SRAM.
	 * These routines need to be in SRAM as that's the only
	 * memory the MPU can see when it wakes up.
	 */
	omap2_sram_idle = omap_sram_push(omap24xx_idle_loop_suspend,
					 omap24xx_idle_loop_suspend_sz);

	omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend,
					    omap24xx_cpu_suspend_sz);

	pm_set_ops(&omap_pm_ops);
	pm_idle = omap2_pm_idle;

	return 0;
}

__initcall(omap2_pm_init);