pm.c revision 2f34ce81b8c05c900e45bd88595cc154f7bb5957 
1/*
2 * pm.c - Common OMAP2+ power management-related code
3 *
4 * Copyright (C) 2010 Texas Instruments, Inc.
5 * Copyright (C) 2010 Nokia Corporation
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 version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/io.h>
15#include <linux/err.h>
16
17#include <plat/omap-pm.h>
18#include <plat/omap_device.h>
19#include <plat/common.h>
20#include <plat/voltage.h>
21
22#include "powerdomain.h"
23#include "clockdomain.h"
24
25static struct omap_device_pm_latency *pm_lats;
26
27static struct device *mpu_dev;
28static struct device *iva_dev;
29static struct device *l3_dev;
30static struct device *dsp_dev;
31
32struct device *omap2_get_mpuss_device(void)
33{
34	WARN_ON_ONCE(!mpu_dev);
35	return mpu_dev;
36}
37
38struct device *omap2_get_iva_device(void)
39{
40	WARN_ON_ONCE(!iva_dev);
41	return iva_dev;
42}
43
44struct device *omap2_get_l3_device(void)
45{
46	WARN_ON_ONCE(!l3_dev);
47	return l3_dev;
48}
49
50struct device *omap4_get_dsp_device(void)
51{
52	WARN_ON_ONCE(!dsp_dev);
53	return dsp_dev;
54}
55EXPORT_SYMBOL(omap4_get_dsp_device);
56
57/* static int _init_omap_device(struct omap_hwmod *oh, void *user) */
58static int _init_omap_device(char *name, struct device **new_dev)
59{
60	struct omap_hwmod *oh;
61	struct omap_device *od;
62
63	oh = omap_hwmod_lookup(name);
64	if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
65		 __func__, name))
66		return -ENODEV;
67
68	od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
69	if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n",
70		 __func__, name))
71		return -ENODEV;
72
73	*new_dev = &od->pdev.dev;
74
75	return 0;
76}
77
78/*
79 * Build omap_devices for processors and bus.
80 */
81static void omap2_init_processor_devices(void)
82{
83	_init_omap_device("mpu", &mpu_dev);
84	_init_omap_device("iva", &iva_dev);
85	if (cpu_is_omap44xx()) {
86		_init_omap_device("l3_main_1", &l3_dev);
87		_init_omap_device("dsp", &dsp_dev);
88	} else {
89		_init_omap_device("l3_main", &l3_dev);
90	}
91}
92
93/* Types of sleep_switch used in omap_set_pwrdm_state */
94#define FORCEWAKEUP_SWITCH	0
95#define LOWPOWERSTATE_SWITCH	1
96
97/*
98 * This sets pwrdm state (other than mpu & core. Currently only ON &
99 * RET are supported.
100 */
101int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
102{
103	u32 cur_state;
104	int sleep_switch = 0;
105	int ret = 0;
106
107	if (pwrdm == NULL || IS_ERR(pwrdm))
108		return -EINVAL;
109
110	while (!(pwrdm->pwrsts & (1 << state))) {
111		if (state == PWRDM_POWER_OFF)
112			return ret;
113		state--;
114	}
115
116	cur_state = pwrdm_read_next_pwrst(pwrdm);
117	if (cur_state == state)
118		return ret;
119
120	if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
121		if ((pwrdm_read_pwrst(pwrdm) > state) &&
122			(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
123			sleep_switch = LOWPOWERSTATE_SWITCH;
124		} else {
125			omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
126			pwrdm_wait_transition(pwrdm);
127			sleep_switch = FORCEWAKEUP_SWITCH;
128		}
129	}
130
131	ret = pwrdm_set_next_pwrst(pwrdm, state);
132	if (ret) {
133		printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
134		       pwrdm->name);
135		goto err;
136	}
137
138	switch (sleep_switch) {
139	case FORCEWAKEUP_SWITCH:
140		if (pwrdm->pwrdm_clkdms[0]->flags & CLKDM_CAN_ENABLE_AUTO)
141			omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
142		else
143			omap2_clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
144		break;
145	case LOWPOWERSTATE_SWITCH:
146		pwrdm_set_lowpwrstchange(pwrdm);
147		break;
148	default:
149		return ret;
150	}
151
152	pwrdm_wait_transition(pwrdm);
153	pwrdm_state_switch(pwrdm);
154err:
155	return ret;
156}
157
158static int __init omap2_common_pm_init(void)
159{
160	omap2_init_processor_devices();
161	omap_pm_if_init();
162
163	return 0;
164}
165postcore_initcall(omap2_common_pm_init);
166
167static int __init omap2_common_pm_late_init(void)
168{
169	omap_voltage_late_init();
170
171	return 0;
172}
173late_initcall(omap2_common_pm_late_init);
174