[mirror_ubuntu-bionic-kernel.git] / arch / arm / mach-omap2 / pm44xx.c

/*
 * OMAP4 Power Management Routines
 *
 * Copyright (C) 2010 Texas Instruments, Inc.
 * Rajendra Nayak <rnayak@ti.com>
 *
 * 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/suspend.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/slab.h>

#include <plat/powerdomain.h>
#include <mach/omap4-common.h>

struct power_state {
	struct powerdomain *pwrdm;
	u32 next_state;
#ifdef CONFIG_SUSPEND
	u32 saved_state;
#endif
	struct list_head node;
};

static LIST_HEAD(pwrst_list);

#ifdef CONFIG_SUSPEND
static int omap4_pm_prepare(void)
{
	disable_hlt();
	return 0;
}

static int omap4_pm_suspend(void)
{
	do_wfi();
	return 0;
}

static int omap4_pm_enter(suspend_state_t suspend_state)
{
	int ret = 0;

	switch (suspend_state) {
	case PM_SUSPEND_STANDBY:
	case PM_SUSPEND_MEM:
		ret = omap4_pm_suspend();
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static void omap4_pm_finish(void)
{
	enable_hlt();
	return;
}

static int omap4_pm_begin(suspend_state_t state)
{
	return 0;
}

static void omap4_pm_end(void)
{
	return;
}

static const struct platform_suspend_ops omap_pm_ops = {
	.begin		= omap4_pm_begin,
	.end		= omap4_pm_end,
	.prepare	= omap4_pm_prepare,
	.enter		= omap4_pm_enter,
	.finish		= omap4_pm_finish,
	.valid		= suspend_valid_only_mem,
};
#endif /* CONFIG_SUSPEND */

static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
{
	struct power_state *pwrst;

	if (!pwrdm->pwrsts)
		return 0;

	pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
	if (!pwrst)
		return -ENOMEM;
	pwrst->pwrdm = pwrdm;
	pwrst->next_state = PWRDM_POWER_ON;
	list_add(&pwrst->node, &pwrst_list);

	return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state);
}

/**
 * omap4_pm_init - Init routine for OMAP4 PM
 *
 * Initializes all powerdomain and clockdomain target states
 * and all PRCM settings.
 */
static int __init omap4_pm_init(void)
{
	int ret;

	if (!cpu_is_omap44xx())
		return -ENODEV;

	pr_err("Power Management for TI OMAP4.\n");

#ifdef CONFIG_PM
	ret = pwrdm_for_each(pwrdms_setup, NULL);
	if (ret) {
		pr_err("Failed to setup powerdomains\n");
		goto err2;
	}
#endif

#ifdef CONFIG_SUSPEND
	suspend_set_ops(&omap_pm_ops);
#endif /* CONFIG_SUSPEND */

err2:
	return ret;
}
late_initcall(omap4_pm_init);
Commit	Line	Data
5643aebb RN	1	/*
	2	* OMAP4 Power Management Routines
	3	*
	4	* Copyright (C) 2010 Texas Instruments, Inc.
	5	* Rajendra Nayak <rnayak@ti.com>
	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/pm.h>
	13	#include <linux/suspend.h>
	14	#include <linux/module.h>
	15	#include <linux/list.h>
	16	#include <linux/err.h>
	17	#include <linux/slab.h>
	18
	19	#include <plat/powerdomain.h>
	20	#include <mach/omap4-common.h>
	21
	22	struct power_state {
	23	struct powerdomain *pwrdm;
	24	u32 next_state;
	25	#ifdef CONFIG_SUSPEND
	26	u32 saved_state;
	27	#endif
	28	struct list_head node;
	29	};
	30
	31	static LIST_HEAD(pwrst_list);
	32
	33	#ifdef CONFIG_SUSPEND
	34	static int omap4_pm_prepare(void)
	35	{
	36	disable_hlt();
	37	return 0;
	38	}
	39
	40	static int omap4_pm_suspend(void)
	41	{
	42	do_wfi();
	43	return 0;
	44	}
	45
	46	static int omap4_pm_enter(suspend_state_t suspend_state)
	47	{
	48	int ret = 0;
	49
	50	switch (suspend_state) {
	51	case PM_SUSPEND_STANDBY:
	52	case PM_SUSPEND_MEM:
	53	ret = omap4_pm_suspend();
	54	break;
	55	default:
	56	ret = -EINVAL;
	57	}
	58
	59	return ret;
	60	}
	61
	62	static void omap4_pm_finish(void)
	63	{
	64	enable_hlt();
65	return;
66	}
67
68	static int omap4_pm_begin(suspend_state_t state)
69	{
70	return 0;
71	}
72
73	static void omap4_pm_end(void)
74	{
75	return;
76	}
77
2f55ac07	78	static const struct platform_suspend_ops omap_pm_ops = {
5643aebb RN	79	.begin = omap4_pm_begin,
	80	.end = omap4_pm_end,
	81	.prepare = omap4_pm_prepare,
	82	.enter = omap4_pm_enter,
	83	.finish = omap4_pm_finish,
	84	.valid = suspend_valid_only_mem,
	85	};
	86	#endif /* CONFIG_SUSPEND */
	87
	88	static int __init pwrdms_setup(struct powerdomain pwrdm, void unused)
	89	{
	90	struct power_state *pwrst;
	91
	92	if (!pwrdm->pwrsts)
	93	return 0;
	94
	95	pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
	96	if (!pwrst)
	97	return -ENOMEM;
	98	pwrst->pwrdm = pwrdm;
	99	pwrst->next_state = PWRDM_POWER_ON;
	100	list_add(&pwrst->node, &pwrst_list);
	101
	102	return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state);
	103	}
	104
	105	/**
	106	* omap4_pm_init - Init routine for OMAP4 PM
	107	*
	108	* Initializes all powerdomain and clockdomain target states
	109	* and all PRCM settings.
	110	*/
	111	static int __init omap4_pm_init(void)
	112	{
	113	int ret;
	114
	115	if (!cpu_is_omap44xx())
	116	return -ENODEV;
	117
	118	pr_err("Power Management for TI OMAP4.\n");
	119
	120	#ifdef CONFIG_PM
	121	ret = pwrdm_for_each(pwrdms_setup, NULL);
	122	if (ret) {
	123	pr_err("Failed to setup powerdomains\n");
	124	goto err2;
	125	}
	126	#endif
	127
	128	#ifdef CONFIG_SUSPEND
	129	suspend_set_ops(&omap_pm_ops);
	130	#endif /* CONFIG_SUSPEND */
	131
	132	err2:
	133	return ret;
	134	}
	135	late_initcall(omap4_pm_init);