summaryrefslogtreecommitdiff
path: root/arch/arm/mach-omap2/pm.c
blob: 24228e9dd49633c3ee2428ec189519f418cedcfa (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
/*
 * pm.c - Common OMAP2+ power management-related code
 *
 * Copyright (C) 2010 Texas Instruments, Inc.
 * Copyright (C) 2010 Nokia Corporation
 *
 * 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/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/err.h>

#include <plat/omap-pm.h>
#include <plat/omap_device.h>
#include <plat/common.h>

#include <plat/powerdomain.h>
#include "clockdomain.h"

static struct omap_device_pm_latency *pm_lats;

static struct device *mpu_dev;
static struct device *iva_dev;
static struct device *l3_dev;
static struct device *dsp_dev;

struct device *omap2_get_mpuss_device(void)
{
	WARN_ON_ONCE(!mpu_dev);
	return mpu_dev;
}

struct device *omap2_get_iva_device(void)
{
	WARN_ON_ONCE(!iva_dev);
	return iva_dev;
}

struct device *omap2_get_l3_device(void)
{
	WARN_ON_ONCE(!l3_dev);
	return l3_dev;
}

struct device *omap4_get_dsp_device(void)
{
	WARN_ON_ONCE(!dsp_dev);
	return dsp_dev;
}
EXPORT_SYMBOL(omap4_get_dsp_device);

/* static int _init_omap_device(struct omap_hwmod *oh, void *user) */
static int _init_omap_device(char *name, struct device **new_dev)
{
	struct omap_hwmod *oh;
	struct omap_device *od;

	oh = omap_hwmod_lookup(name);
	if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
		 __func__, name))
		return -ENODEV;

	od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
	if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n",
		 __func__, name))
		return -ENODEV;

	*new_dev = &od->pdev.dev;

	return 0;
}

/*
 * Build omap_devices for processors and bus.
 */
static void omap2_init_processor_devices(void)
{
	_init_omap_device("mpu", &mpu_dev);
	_init_omap_device("iva", &iva_dev);
	if (cpu_is_omap44xx()) {
		_init_omap_device("l3_main_1", &l3_dev);
		_init_omap_device("dsp", &dsp_dev);
	} else {
		_init_omap_device("l3_main", &l3_dev);
	}
}

/*
 * This sets pwrdm state (other than mpu & core. Currently only ON &
 * RET are supported. Function is assuming that clkdm doesn't have
 * hw_sup mode enabled.
 */
int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
{
	u32 cur_state;
	int sleep_switch = 0;
	int ret = 0;

	if (pwrdm == NULL || IS_ERR(pwrdm))
		return -EINVAL;

	while (!(pwrdm->pwrsts & (1 << state))) {
		if (state == PWRDM_POWER_OFF)
			return ret;
		state--;
	}

	cur_state = pwrdm_read_next_pwrst(pwrdm);
	if (cur_state == state)
		return ret;

	if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
		omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
		sleep_switch = 1;
		pwrdm_wait_transition(pwrdm);
	}

	ret = pwrdm_set_next_pwrst(pwrdm, state);
	if (ret) {
		printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
		       pwrdm->name);
		goto err;
	}

	if (sleep_switch) {
		omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
		pwrdm_wait_transition(pwrdm);
		pwrdm_state_switch(pwrdm);
	}

err:
	return ret;
}

static int __init omap2_common_pm_init(void)
{
	omap2_init_processor_devices();
	omap_pm_if_init();

	return 0;
}
postcore_initcall(omap2_common_pm_init);