[deliverable/linux.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 "common.h"
#include "powerdomain.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_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 int omap4_pm_begin(suspend_state_t state)
{
	disable_hlt();
	return 0;
}

static void omap4_pm_end(void)
{
	enable_hlt();
	return;
}

static const struct platform_suspend_ops omap_pm_ops = {
	.begin		= omap4_pm_begin,
	.end		= omap4_pm_end,
	.enter		= omap4_pm_enter,
	.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;
	struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm;
	struct clockdomain *ducati_clkdm, *l3_2_clkdm, *l4_per_clkdm;

	if (!cpu_is_omap44xx())
		return -ENODEV;

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

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

	/*
	 * The dynamic dependency between MPUSS -> MEMIF and
	 * MPUSS -> L4_PER/L3_* and DUCATI -> L3_* doesn't work as
	 * expected. The hardware recommendation is to enable static
	 * dependencies for these to avoid system lock ups or random crashes.
	 */
	mpuss_clkdm = clkdm_lookup("mpuss_clkdm");
	emif_clkdm = clkdm_lookup("l3_emif_clkdm");
	l3_1_clkdm = clkdm_lookup("l3_1_clkdm");
	l3_2_clkdm = clkdm_lookup("l3_2_clkdm");
	l4_per_clkdm = clkdm_lookup("l4_per_clkdm");
	ducati_clkdm = clkdm_lookup("ducati_clkdm");
	if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) ||
		(!l3_2_clkdm) || (!ducati_clkdm) || (!l4_per_clkdm))
		goto err2;

	ret = clkdm_add_wkdep(mpuss_clkdm, emif_clkdm);
	ret |= clkdm_add_wkdep(mpuss_clkdm, l3_1_clkdm);
	ret |= clkdm_add_wkdep(mpuss_clkdm, l3_2_clkdm);
	ret |= clkdm_add_wkdep(mpuss_clkdm, l4_per_clkdm);
	ret |= clkdm_add_wkdep(ducati_clkdm, l3_1_clkdm);
	ret |= clkdm_add_wkdep(ducati_clkdm, l3_2_clkdm);
	if (ret) {
		pr_err("Failed to add MPUSS -> L3/EMIF/L4PER, DUCATI -> L3 "
				"wakeup dependency\n");
		goto err2;
	}

#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
4e65331c	19	#include "common.h"
72e06d08	20	#include "powerdomain.h"
5643aebb RN	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
5643aebb RN	34	static int omap4_pm_suspend(void)
	35	{
	36	do_wfi();
	37	return 0;
	38	}
	39
	40	static int omap4_pm_enter(suspend_state_t suspend_state)
	41	{
	42	int ret = 0;
	43
	44	switch (suspend_state) {
	45	case PM_SUSPEND_STANDBY:
	46	case PM_SUSPEND_MEM:
	47	ret = omap4_pm_suspend();
	48	break;
	49	default:
	50	ret = -EINVAL;
	51	}
	52
	53	return ret;
	54	}
	55
5643aebb RN	56	static int omap4_pm_begin(suspend_state_t state)
5643aebb RN	57	{
c166381d	58	disable_hlt();
5643aebb RN	59	return 0;
	60	}
	61
	62	static void omap4_pm_end(void)
	63	{
c166381d	64	enable_hlt();
5643aebb RN	65	return;
	66	}
	67
2f55ac07	68	static const struct platform_suspend_ops omap_pm_ops = {
5643aebb RN	69	.begin = omap4_pm_begin,
5643aebb RN	70	.end = omap4_pm_end,
5643aebb	71	.enter = omap4_pm_enter,
5643aebb RN	72	.valid = suspend_valid_only_mem,
	73	};
	74	#endif /* CONFIG_SUSPEND */
	75
	76	static int __init pwrdms_setup(struct powerdomain pwrdm, void unused)
	77	{
	78	struct power_state *pwrst;
	79
	80	if (!pwrdm->pwrsts)
	81	return 0;
	82
	83	pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
	84	if (!pwrst)
	85	return -ENOMEM;
	86	pwrst->pwrdm = pwrdm;
	87	pwrst->next_state = PWRDM_POWER_ON;
	88	list_add(&pwrst->node, &pwrst_list);
	89
	90	return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state);
	91	}
	92
	93	/**
	94	* omap4_pm_init - Init routine for OMAP4 PM
	95	*
	96	* Initializes all powerdomain and clockdomain target states
	97	* and all PRCM settings.
	98	*/
	99	static int __init omap4_pm_init(void)
	100	{
	101	int ret;
12f27826 SS	102	struct clockdomain emif_clkdm, mpuss_clkdm, *l3_1_clkdm;
12f27826 SS	103	struct clockdomain ducati_clkdm, l3_2_clkdm, *l4_per_clkdm;
5643aebb RN	104
	105	if (!cpu_is_omap44xx())
	106	return -ENODEV;
	107
	108	pr_err("Power Management for TI OMAP4.\n");
	109
5643aebb RN	110	ret = pwrdm_for_each(pwrdms_setup, NULL);
	111	if (ret) {
	112	pr_err("Failed to setup powerdomains\n");
	113	goto err2;
	114	}
5643aebb	115
12f27826 SS	116	/*
	117	* The dynamic dependency between MPUSS -> MEMIF and
	118	* MPUSS -> L4_PER/L3_* and DUCATI -> L3_* doesn't work as
	119	* expected. The hardware recommendation is to enable static
	120	* dependencies for these to avoid system lock ups or random crashes.
	121	*/
	122	mpuss_clkdm = clkdm_lookup("mpuss_clkdm");
	123	emif_clkdm = clkdm_lookup("l3_emif_clkdm");
	124	l3_1_clkdm = clkdm_lookup("l3_1_clkdm");
	125	l3_2_clkdm = clkdm_lookup("l3_2_clkdm");
	126	l4_per_clkdm = clkdm_lookup("l4_per_clkdm");
	127	ducati_clkdm = clkdm_lookup("ducati_clkdm");
	128	if ((!mpuss_clkdm) \|\| (!emif_clkdm) \|\| (!l3_1_clkdm) \|\|
	129	(!l3_2_clkdm) \|\| (!ducati_clkdm) \|\| (!l4_per_clkdm))
	130	goto err2;
	131
	132	ret = clkdm_add_wkdep(mpuss_clkdm, emif_clkdm);
	133	ret \|= clkdm_add_wkdep(mpuss_clkdm, l3_1_clkdm);
	134	ret \|= clkdm_add_wkdep(mpuss_clkdm, l3_2_clkdm);
	135	ret \|= clkdm_add_wkdep(mpuss_clkdm, l4_per_clkdm);
	136	ret \|= clkdm_add_wkdep(ducati_clkdm, l3_1_clkdm);
	137	ret \|= clkdm_add_wkdep(ducati_clkdm, l3_2_clkdm);
	138	if (ret) {
	139	pr_err("Failed to add MPUSS -> L3/EMIF/L4PER, DUCATI -> L3 "
	140	"wakeup dependency\n");
	141	goto err2;
	142	}
	143
5643aebb RN	144	#ifdef CONFIG_SUSPEND
	145	suspend_set_ops(&omap_pm_ops);
	146	#endif /* CONFIG_SUSPEND */
	147
	148	err2:
	149	return ret;
	150	}
	151	late_initcall(omap4_pm_init);