[deliverable/linux.git] / arch / arm / mach-omap2 / cpuidle34xx.c

/*
 * linux/arch/arm/mach-omap2/cpuidle34xx.c
 *
 * OMAP3 CPU IDLE Routines
 *
 * Copyright (C) 2008 Texas Instruments, Inc.
 * Rajendra Nayak <rnayak@ti.com>
 *
 * Copyright (C) 2007 Texas Instruments, Inc.
 * Karthik Dasu <karthik-dp@ti.com>
 *
 * 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 omap2
 *
 * 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/sched.h>
#include <linux/cpuidle.h>

#include <plat/prcm.h>
#include <plat/irqs.h>
#include <plat/powerdomain.h>
#include <plat/clockdomain.h>
#include <plat/control.h>
#include <plat/serial.h>

#include "pm.h"

#ifdef CONFIG_CPU_IDLE

#define OMAP3_MAX_STATES 7
#define OMAP3_STATE_C1 0 /* C1 - MPU WFI + Core active */
#define OMAP3_STATE_C2 1 /* C2 - MPU WFI + Core inactive */
#define OMAP3_STATE_C3 2 /* C3 - MPU CSWR + Core inactive */
#define OMAP3_STATE_C4 3 /* C4 - MPU OFF + Core iactive */
#define OMAP3_STATE_C5 4 /* C5 - MPU RET + Core RET */
#define OMAP3_STATE_C6 5 /* C6 - MPU OFF + Core RET */
#define OMAP3_STATE_C7 6 /* C7 - MPU OFF + Core OFF */

#define OMAP3_STATE_MAX OMAP3_STATE_C7

struct omap3_processor_cx {
	u8 valid;
	u8 type;
	u32 sleep_latency;
	u32 wakeup_latency;
	u32 mpu_state;
	u32 core_state;
	u32 threshold;
	u32 flags;
};

struct omap3_processor_cx omap3_power_states[OMAP3_MAX_STATES];
struct omap3_processor_cx current_cx_state;
struct powerdomain *mpu_pd, *core_pd, *per_pd;
struct powerdomain *cam_pd;

/*
 * The latencies/thresholds for various C states have
 * to be configured from the respective board files.
 * These are some default values (which might not provide
 * the best power savings) used on boards which do not
 * pass these details from the board file.
 */
static struct cpuidle_params cpuidle_params_table[] = {
	/* C1 */
	{1, 2, 2, 5},
	/* C2 */
	{1, 10, 10, 30},
	/* C3 */
	{1, 50, 50, 300},
	/* C4 */
	{1, 1500, 1800, 4000},
	/* C5 */
	{1, 2500, 7500, 12000},
	/* C6 */
	{1, 3000, 8500, 15000},
	/* C7 */
	{1, 10000, 30000, 300000},
};

static int omap3_idle_bm_check(void)
{
	if (!omap3_can_sleep())
		return 1;
	return 0;
}

static int _cpuidle_allow_idle(struct powerdomain *pwrdm,
				struct clockdomain *clkdm)
{
	omap2_clkdm_allow_idle(clkdm);
	return 0;
}

static int _cpuidle_deny_idle(struct powerdomain *pwrdm,
				struct clockdomain *clkdm)
{
	omap2_clkdm_deny_idle(clkdm);
	return 0;
}

/**
 * omap3_enter_idle - Programs OMAP3 to enter the specified state
 * @dev: cpuidle device
 * @state: The target state to be programmed
 *
 * Called from the CPUidle framework to program the device to the
 * specified target state selected by the governor.
 */
static int omap3_enter_idle(struct cpuidle_device *dev,
			struct cpuidle_state *state)
{
	struct omap3_processor_cx *cx = cpuidle_get_statedata(state);
	struct timespec ts_preidle, ts_postidle, ts_idle;
	u32 mpu_state = cx->mpu_state, core_state = cx->core_state;

	current_cx_state = *cx;

	/* Used to keep track of the total time in idle */
	getnstimeofday(&ts_preidle);

	local_irq_disable();
	local_fiq_disable();

	pwrdm_set_next_pwrst(mpu_pd, mpu_state);
	pwrdm_set_next_pwrst(core_pd, core_state);

	if (omap_irq_pending() || need_resched())
		goto return_sleep_time;

	if (cx->type == OMAP3_STATE_C1) {
		pwrdm_for_each_clkdm(mpu_pd, _cpuidle_deny_idle);
		pwrdm_for_each_clkdm(core_pd, _cpuidle_deny_idle);
	}

	/* Execute ARM wfi */
	omap_sram_idle();

	if (cx->type == OMAP3_STATE_C1) {
		pwrdm_for_each_clkdm(mpu_pd, _cpuidle_allow_idle);
		pwrdm_for_each_clkdm(core_pd, _cpuidle_allow_idle);
	}

return_sleep_time:
	getnstimeofday(&ts_postidle);
	ts_idle = timespec_sub(ts_postidle, ts_preidle);

	local_irq_enable();
	local_fiq_enable();

	return ts_idle.tv_nsec / NSEC_PER_USEC + ts_idle.tv_sec * USEC_PER_SEC;
}

/**
 * next_valid_state - Find next valid c-state
 * @dev: cpuidle device
 * @state: Currently selected c-state
 *
 * If the current state is valid, it is returned back to the caller.
 * Else, this function searches for a lower c-state which is still
 * valid (as defined in omap3_power_states[]).
 */
static struct cpuidle_state *next_valid_state(struct cpuidle_device *dev,
						struct cpuidle_state *curr)
{
	struct cpuidle_state *next = NULL;
	struct omap3_processor_cx *cx;

	cx = (struct omap3_processor_cx *)cpuidle_get_statedata(curr);

	/* Check if current state is valid */
	if (cx->valid) {
		return curr;
	} else {
		u8 idx = OMAP3_STATE_MAX;

		/*
		 * Reach the current state starting at highest C-state
		 */
		for (; idx >= OMAP3_STATE_C1; idx--) {
			if (&dev->states[idx] == curr) {
				next = &dev->states[idx];
				break;
			}
		}

		/*
		 * Should never hit this condition.
		 */
		WARN_ON(next == NULL);

		/*
		 * Drop to next valid state.
		 * Start search from the next (lower) state.
		 */
		idx--;
		for (; idx >= OMAP3_STATE_C1; idx--) {
			struct omap3_processor_cx *cx;

			cx = cpuidle_get_statedata(&dev->states[idx]);
			if (cx->valid) {
				next = &dev->states[idx];
				break;
			}
		}
		/*
		 * C1 and C2 are always valid.
		 * So, no need to check for 'next==NULL' outside this loop.
		 */
	}

	return next;
}

/**
 * omap3_enter_idle_bm - Checks for any bus activity
 * @dev: cpuidle device
 * @state: The target state to be programmed
 *
 * Used for C states with CPUIDLE_FLAG_CHECK_BM flag set. This
 * function checks for any pending activity and then programs the
 * device to the specified or a safer state.
 */
static int omap3_enter_idle_bm(struct cpuidle_device *dev,
			       struct cpuidle_state *state)
{
	struct cpuidle_state *new_state = next_valid_state(dev, state);
	u32 core_next_state, per_next_state = 0, per_saved_state = 0;
	u32 cam_state;
	struct omap3_processor_cx *cx;
	int ret;

	if ((state->flags & CPUIDLE_FLAG_CHECK_BM) && omap3_idle_bm_check()) {
		BUG_ON(!dev->safe_state);
		new_state = dev->safe_state;
		goto select_state;
	}

	cx = cpuidle_get_statedata(state);
	core_next_state = cx->core_state;

	/*
	 * FIXME: we currently manage device-specific idle states
	 *        for PER and CORE in combination with CPU-specific
	 *        idle states.  This is wrong, and device-specific
	 *        idle managment needs to be separated out into 
	 *        its own code.
	 */

	/*
	 * Prevent idle completely if CAM is active.
	 * CAM does not have wakeup capability in OMAP3.
	 */
	cam_state = pwrdm_read_pwrst(cam_pd);
	if (cam_state == PWRDM_POWER_ON) {
		new_state = dev->safe_state;
		goto select_state;
	}

	/*
	 * Prevent PER off if CORE is not in retention or off as this
	 * would disable PER wakeups completely.
	 */
	per_next_state = per_saved_state = pwrdm_read_next_pwrst(per_pd);
	if ((per_next_state == PWRDM_POWER_OFF) &&
	    (core_next_state > PWRDM_POWER_RET))
		per_next_state = PWRDM_POWER_RET;

	/* Are we changing PER target state? */
	if (per_next_state != per_saved_state)
		pwrdm_set_next_pwrst(per_pd, per_next_state);

select_state:
	dev->last_state = new_state;
	ret = omap3_enter_idle(dev, new_state);

	/* Restore original PER state if it was modified */
	if (per_next_state != per_saved_state)
		pwrdm_set_next_pwrst(per_pd, per_saved_state);

	return ret;
}

DEFINE_PER_CPU(struct cpuidle_device, omap3_idle_dev);

/**
 * omap3_cpuidle_update_states - Update the cpuidle states.
 *
 * Currently, this function toggles the validity of idle states based upon
 * the flag 'enable_off_mode'. When the flag is set all states are valid.
 * Else, states leading to OFF state set to be invalid.
 */
void omap3_cpuidle_update_states(void)
{
	int i;

	for (i = OMAP3_STATE_C1; i < OMAP3_MAX_STATES; i++) {
		struct omap3_processor_cx *cx = &omap3_power_states[i];

		if (enable_off_mode) {
			cx->valid = 1;
		} else {
			if ((cx->mpu_state == PWRDM_POWER_OFF) ||
				(cx->core_state	== PWRDM_POWER_OFF))
				cx->valid = 0;
		}
	}
}

void omap3_pm_init_cpuidle(struct cpuidle_params *cpuidle_board_params)
{
	int i;

	if (!cpuidle_board_params)
		return;

	for (i = OMAP3_STATE_C1; i < OMAP3_MAX_STATES; i++) {
		cpuidle_params_table[i].valid =
			cpuidle_board_params[i].valid;
		cpuidle_params_table[i].sleep_latency =
			cpuidle_board_params[i].sleep_latency;
		cpuidle_params_table[i].wake_latency =
			cpuidle_board_params[i].wake_latency;
		cpuidle_params_table[i].threshold =
			cpuidle_board_params[i].threshold;
	}
	return;
}

/* omap3_init_power_states - Initialises the OMAP3 specific C states.
 *
 * Below is the desciption of each C state.
 * 	C1 . MPU WFI + Core active
 *	C2 . MPU WFI + Core inactive
 *	C3 . MPU CSWR + Core inactive
 *	C4 . MPU OFF + Core inactive
 *	C5 . MPU CSWR + Core CSWR
 *	C6 . MPU OFF + Core CSWR
 *	C7 . MPU OFF + Core OFF
 */
void omap_init_power_states(void)
{
	/* C1 . MPU WFI + Core active */
	omap3_power_states[OMAP3_STATE_C1].valid =
			cpuidle_params_table[OMAP3_STATE_C1].valid;
	omap3_power_states[OMAP3_STATE_C1].type = OMAP3_STATE_C1;
	omap3_power_states[OMAP3_STATE_C1].sleep_latency =
			cpuidle_params_table[OMAP3_STATE_C1].sleep_latency;
	omap3_power_states[OMAP3_STATE_C1].wakeup_latency =
			cpuidle_params_table[OMAP3_STATE_C1].wake_latency;
	omap3_power_states[OMAP3_STATE_C1].threshold =
			cpuidle_params_table[OMAP3_STATE_C1].threshold;
	omap3_power_states[OMAP3_STATE_C1].mpu_state = PWRDM_POWER_ON;
	omap3_power_states[OMAP3_STATE_C1].core_state = PWRDM_POWER_ON;
	omap3_power_states[OMAP3_STATE_C1].flags = CPUIDLE_FLAG_TIME_VALID;

	/* C2 . MPU WFI + Core inactive */
	omap3_power_states[OMAP3_STATE_C2].valid =
			cpuidle_params_table[OMAP3_STATE_C2].valid;
	omap3_power_states[OMAP3_STATE_C2].type = OMAP3_STATE_C2;
	omap3_power_states[OMAP3_STATE_C2].sleep_latency =
			cpuidle_params_table[OMAP3_STATE_C2].sleep_latency;
	omap3_power_states[OMAP3_STATE_C2].wakeup_latency =
			cpuidle_params_table[OMAP3_STATE_C2].wake_latency;
	omap3_power_states[OMAP3_STATE_C2].threshold =
			cpuidle_params_table[OMAP3_STATE_C2].threshold;
	omap3_power_states[OMAP3_STATE_C2].mpu_state = PWRDM_POWER_ON;
	omap3_power_states[OMAP3_STATE_C2].core_state = PWRDM_POWER_ON;
	omap3_power_states[OMAP3_STATE_C2].flags = CPUIDLE_FLAG_TIME_VALID |
				CPUIDLE_FLAG_CHECK_BM;

	/* C3 . MPU CSWR + Core inactive */
	omap3_power_states[OMAP3_STATE_C3].valid =
			cpuidle_params_table[OMAP3_STATE_C3].valid;
	omap3_power_states[OMAP3_STATE_C3].type = OMAP3_STATE_C3;
	omap3_power_states[OMAP3_STATE_C3].sleep_latency =
			cpuidle_params_table[OMAP3_STATE_C3].sleep_latency;
	omap3_power_states[OMAP3_STATE_C3].wakeup_latency =
			cpuidle_params_table[OMAP3_STATE_C3].wake_latency;
	omap3_power_states[OMAP3_STATE_C3].threshold =
			cpuidle_params_table[OMAP3_STATE_C3].threshold;
	omap3_power_states[OMAP3_STATE_C3].mpu_state = PWRDM_POWER_RET;
	omap3_power_states[OMAP3_STATE_C3].core_state = PWRDM_POWER_ON;
	omap3_power_states[OMAP3_STATE_C3].flags = CPUIDLE_FLAG_TIME_VALID |
				CPUIDLE_FLAG_CHECK_BM;

	/* C4 . MPU OFF + Core inactive */
	omap3_power_states[OMAP3_STATE_C4].valid =
			cpuidle_params_table[OMAP3_STATE_C4].valid;
	omap3_power_states[OMAP3_STATE_C4].type = OMAP3_STATE_C4;
	omap3_power_states[OMAP3_STATE_C4].sleep_latency =
			cpuidle_params_table[OMAP3_STATE_C4].sleep_latency;
	omap3_power_states[OMAP3_STATE_C4].wakeup_latency =
			cpuidle_params_table[OMAP3_STATE_C4].wake_latency;
	omap3_power_states[OMAP3_STATE_C4].threshold =
			cpuidle_params_table[OMAP3_STATE_C4].threshold;
	omap3_power_states[OMAP3_STATE_C4].mpu_state = PWRDM_POWER_OFF;
	omap3_power_states[OMAP3_STATE_C4].core_state = PWRDM_POWER_ON;
	omap3_power_states[OMAP3_STATE_C4].flags = CPUIDLE_FLAG_TIME_VALID |
				CPUIDLE_FLAG_CHECK_BM;

	/* C5 . MPU CSWR + Core CSWR*/
	omap3_power_states[OMAP3_STATE_C5].valid =
			cpuidle_params_table[OMAP3_STATE_C5].valid;
	omap3_power_states[OMAP3_STATE_C5].type = OMAP3_STATE_C5;
	omap3_power_states[OMAP3_STATE_C5].sleep_latency =
			cpuidle_params_table[OMAP3_STATE_C5].sleep_latency;
	omap3_power_states[OMAP3_STATE_C5].wakeup_latency =
			cpuidle_params_table[OMAP3_STATE_C5].wake_latency;
	omap3_power_states[OMAP3_STATE_C5].threshold =
			cpuidle_params_table[OMAP3_STATE_C5].threshold;
	omap3_power_states[OMAP3_STATE_C5].mpu_state = PWRDM_POWER_RET;
	omap3_power_states[OMAP3_STATE_C5].core_state = PWRDM_POWER_RET;
	omap3_power_states[OMAP3_STATE_C5].flags = CPUIDLE_FLAG_TIME_VALID |
				CPUIDLE_FLAG_CHECK_BM;

	/* C6 . MPU OFF + Core CSWR */
	omap3_power_states[OMAP3_STATE_C6].valid =
			cpuidle_params_table[OMAP3_STATE_C6].valid;
	omap3_power_states[OMAP3_STATE_C6].type = OMAP3_STATE_C6;
	omap3_power_states[OMAP3_STATE_C6].sleep_latency =
			cpuidle_params_table[OMAP3_STATE_C6].sleep_latency;
	omap3_power_states[OMAP3_STATE_C6].wakeup_latency =
			cpuidle_params_table[OMAP3_STATE_C6].wake_latency;
	omap3_power_states[OMAP3_STATE_C6].threshold =
			cpuidle_params_table[OMAP3_STATE_C6].threshold;
	omap3_power_states[OMAP3_STATE_C6].mpu_state = PWRDM_POWER_OFF;
	omap3_power_states[OMAP3_STATE_C6].core_state = PWRDM_POWER_RET;
	omap3_power_states[OMAP3_STATE_C6].flags = CPUIDLE_FLAG_TIME_VALID |
				CPUIDLE_FLAG_CHECK_BM;

	/* C7 . MPU OFF + Core OFF */
	omap3_power_states[OMAP3_STATE_C7].valid =
			cpuidle_params_table[OMAP3_STATE_C7].valid;
	omap3_power_states[OMAP3_STATE_C7].type = OMAP3_STATE_C7;
	omap3_power_states[OMAP3_STATE_C7].sleep_latency =
			cpuidle_params_table[OMAP3_STATE_C7].sleep_latency;
	omap3_power_states[OMAP3_STATE_C7].wakeup_latency =
			cpuidle_params_table[OMAP3_STATE_C7].wake_latency;
	omap3_power_states[OMAP3_STATE_C7].threshold =
			cpuidle_params_table[OMAP3_STATE_C7].threshold;
	omap3_power_states[OMAP3_STATE_C7].mpu_state = PWRDM_POWER_OFF;
	omap3_power_states[OMAP3_STATE_C7].core_state = PWRDM_POWER_OFF;
	omap3_power_states[OMAP3_STATE_C7].flags = CPUIDLE_FLAG_TIME_VALID |
				CPUIDLE_FLAG_CHECK_BM;
}

struct cpuidle_driver omap3_idle_driver = {
	.name = 	"omap3_idle",
	.owner = 	THIS_MODULE,
};

/**
 * omap3_idle_init - Init routine for OMAP3 idle
 *
 * Registers the OMAP3 specific cpuidle driver with the cpuidle
 * framework with the valid set of states.
 */
int __init omap3_idle_init(void)
{
	int i, count = 0;
	struct omap3_processor_cx *cx;
	struct cpuidle_state *state;
	struct cpuidle_device *dev;

	mpu_pd = pwrdm_lookup("mpu_pwrdm");
	core_pd = pwrdm_lookup("core_pwrdm");
	per_pd = pwrdm_lookup("per_pwrdm");
	cam_pd = pwrdm_lookup("cam_pwrdm");

	omap_init_power_states();
	cpuidle_register_driver(&omap3_idle_driver);

	dev = &per_cpu(omap3_idle_dev, smp_processor_id());

	for (i = OMAP3_STATE_C1; i < OMAP3_MAX_STATES; i++) {
		cx = &omap3_power_states[i];
		state = &dev->states[count];

		if (!cx->valid)
			continue;
		cpuidle_set_statedata(state, cx);
		state->exit_latency = cx->sleep_latency + cx->wakeup_latency;
		state->target_residency = cx->threshold;
		state->flags = cx->flags;
		state->enter = (state->flags & CPUIDLE_FLAG_CHECK_BM) ?
			omap3_enter_idle_bm : omap3_enter_idle;
		if (cx->type == OMAP3_STATE_C1)
			dev->safe_state = state;
		sprintf(state->name, "C%d", count+1);
		count++;
	}

	if (!count)
		return -EINVAL;
	dev->state_count = count;

	omap3_cpuidle_update_states();

	if (cpuidle_register_device(dev)) {
		printk(KERN_ERR "%s: CPUidle register device failed\n",
		       __func__);
		return -EIO;
	}

	return 0;
}
#else
int __init omap3_idle_init(void)
{
	return 0;
}
#endif /* CONFIG_CPU_IDLE */
Commit	Line	Data
99e6a4d2 RN	1	/*
	2	* linux/arch/arm/mach-omap2/cpuidle34xx.c
	3	*
	4	* OMAP3 CPU IDLE Routines
	5	*
	6	* Copyright (C) 2008 Texas Instruments, Inc.
	7	* Rajendra Nayak <rnayak@ti.com>
	8	*
	9	* Copyright (C) 2007 Texas Instruments, Inc.
	10	* Karthik Dasu <karthik-dp@ti.com>
	11	*
	12	* Copyright (C) 2006 Nokia Corporation
	13	* Tony Lindgren <tony@atomide.com>
	14	*
	15	* Copyright (C) 2005 Texas Instruments, Inc.
	16	* Richard Woodruff <r-woodruff2@ti.com>
	17	*
	18	* Based on pm.c for omap2
	19	*
	20	* This program is free software; you can redistribute it and/or modify
	21	* it under the terms of the GNU General Public License version 2 as
	22	* published by the Free Software Foundation.
	23	*/
	24
cf22854c	25	#include <linux/sched.h>
99e6a4d2 RN	26	#include <linux/cpuidle.h>
	27
	28	#include <plat/prcm.h>
20b01669	29	#include <plat/irqs.h>
06d8f065 PDS	30	#include <plat/powerdomain.h>
06d8f065 PDS	31	#include <plat/clockdomain.h>
20b01669	32	#include <plat/control.h>
0f724ed9	33	#include <plat/serial.h>
99e6a4d2	34
c98e2230 KH	35	#include "pm.h"
c98e2230 KH	36
99e6a4d2 RN	37	#ifdef CONFIG_CPU_IDLE
99e6a4d2 RN	38
8e431edb SP	39	#define OMAP3_MAX_STATES 7
	40	#define OMAP3_STATE_C1 0 /* C1 - MPU WFI + Core active */
	41	#define OMAP3_STATE_C2 1 /* C2 - MPU WFI + Core inactive */
	42	#define OMAP3_STATE_C3 2 /* C3 - MPU CSWR + Core inactive */
	43	#define OMAP3_STATE_C4 3 /* C4 - MPU OFF + Core iactive */
	44	#define OMAP3_STATE_C5 4 /* C5 - MPU RET + Core RET */
	45	#define OMAP3_STATE_C6 5 /* C6 - MPU OFF + Core RET */
	46	#define OMAP3_STATE_C7 6 /* C7 - MPU OFF + Core OFF */
99e6a4d2	47
6af83b38 SP	48	#define OMAP3_STATE_MAX OMAP3_STATE_C7
6af83b38 SP	49
99e6a4d2 RN	50	struct omap3_processor_cx {
	51	u8 valid;
	52	u8 type;
	53	u32 sleep_latency;
	54	u32 wakeup_latency;
	55	u32 mpu_state;
	56	u32 core_state;
	57	u32 threshold;
	58	u32 flags;
	59	};
	60
	61	struct omap3_processor_cx omap3_power_states[OMAP3_MAX_STATES];
	62	struct omap3_processor_cx current_cx_state;
e7410cf7 KH	63	struct powerdomain mpu_pd, core_pd, *per_pd;
e7410cf7 KH	64	struct powerdomain *cam_pd;
99e6a4d2	65
bb4de3df KH	66	/*
	67	* The latencies/thresholds for various C states have
	68	* to be configured from the respective board files.
	69	* These are some default values (which might not provide
	70	* the best power savings) used on boards which do not
	71	* pass these details from the board file.
	72	*/
	73	static struct cpuidle_params cpuidle_params_table[] = {
	74	/* C1 */
709731bb	75	{1, 2, 2, 5},
bb4de3df	76	/* C2 */
709731bb	77	{1, 10, 10, 30},
bb4de3df	78	/* C3 */
709731bb	79	{1, 50, 50, 300},
bb4de3df	80	/* C4 */
709731bb	81	{1, 1500, 1800, 4000},
bb4de3df	82	/* C5 */
709731bb	83	{1, 2500, 7500, 12000},
bb4de3df	84	/* C6 */
709731bb	85	{1, 3000, 8500, 15000},
bb4de3df	86	/* C7 */
709731bb	87	{1, 10000, 30000, 300000},
bb4de3df KH	88	};
bb4de3df KH	89
99e6a4d2 RN	90	static int omap3_idle_bm_check(void)
99e6a4d2 RN	91	{
20b01669 RN	92	if (!omap3_can_sleep())
20b01669 RN	93	return 1;
99e6a4d2 RN	94	return 0;
	95	}
	96
06d8f065 PDS	97	static int _cpuidle_allow_idle(struct powerdomain *pwrdm,
	98	struct clockdomain *clkdm)
	99	{
	100	omap2_clkdm_allow_idle(clkdm);
	101	return 0;
	102	}
	103
	104	static int _cpuidle_deny_idle(struct powerdomain *pwrdm,
	105	struct clockdomain *clkdm)
	106	{
	107	omap2_clkdm_deny_idle(clkdm);
	108	return 0;
	109	}
	110
99e6a4d2 RN	111	/**
	112	* omap3_enter_idle - Programs OMAP3 to enter the specified state
	113	* @dev: cpuidle device
	114	* @state: The target state to be programmed
	115	*
	116	* Called from the CPUidle framework to program the device to the
	117	* specified target state selected by the governor.
	118	*/
	119	static int omap3_enter_idle(struct cpuidle_device *dev,
	120	struct cpuidle_state *state)
	121	{
	122	struct omap3_processor_cx *cx = cpuidle_get_statedata(state);
	123	struct timespec ts_preidle, ts_postidle, ts_idle;
c98e2230	124	u32 mpu_state = cx->mpu_state, core_state = cx->core_state;
99e6a4d2 RN	125
	126	current_cx_state = *cx;
	127
	128	/* Used to keep track of the total time in idle */
	129	getnstimeofday(&ts_preidle);
	130
	131	local_irq_disable();
	132	local_fiq_disable();
	133
7139178e JH	134	pwrdm_set_next_pwrst(mpu_pd, mpu_state);
7139178e JH	135	pwrdm_set_next_pwrst(core_pd, core_state);
20b01669	136
cf22854c	137	if (omap_irq_pending() \|\| need_resched())
20b01669	138	goto return_sleep_time;
99e6a4d2	139
06d8f065 PDS	140	if (cx->type == OMAP3_STATE_C1) {
	141	pwrdm_for_each_clkdm(mpu_pd, _cpuidle_deny_idle);
	142	pwrdm_for_each_clkdm(core_pd, _cpuidle_deny_idle);
	143	}
	144
99e6a4d2 RN	145	/* Execute ARM wfi */
	146	omap_sram_idle();
	147
06d8f065 PDS	148	if (cx->type == OMAP3_STATE_C1) {
	149	pwrdm_for_each_clkdm(mpu_pd, _cpuidle_allow_idle);
	150	pwrdm_for_each_clkdm(core_pd, _cpuidle_allow_idle);
	151	}
	152
20b01669	153	return_sleep_time:
99e6a4d2 RN	154	getnstimeofday(&ts_postidle);
	155	ts_idle = timespec_sub(ts_postidle, ts_preidle);
	156
	157	local_irq_enable();
	158	local_fiq_enable();
	159
afbcf619	160	return ts_idle.tv_nsec / NSEC_PER_USEC + ts_idle.tv_sec * USEC_PER_SEC;
99e6a4d2 RN	161	}
99e6a4d2 RN	162
6af83b38 SP	163	/**
	164	* next_valid_state - Find next valid c-state
	165	* @dev: cpuidle device
	166	* @state: Currently selected c-state
	167	*
	168	* If the current state is valid, it is returned back to the caller.
	169	* Else, this function searches for a lower c-state which is still
	170	* valid (as defined in omap3_power_states[]).
	171	*/
	172	static struct cpuidle_state next_valid_state(struct cpuidle_device dev,
	173	struct cpuidle_state *curr)
	174	{
	175	struct cpuidle_state *next = NULL;
	176	struct omap3_processor_cx *cx;
	177
	178	cx = (struct omap3_processor_cx *)cpuidle_get_statedata(curr);
	179
	180	/* Check if current state is valid */
	181	if (cx->valid) {
	182	return curr;
	183	} else {
	184	u8 idx = OMAP3_STATE_MAX;
	185
	186	/*
	187	* Reach the current state starting at highest C-state
	188	*/
	189	for (; idx >= OMAP3_STATE_C1; idx--) {
	190	if (&dev->states[idx] == curr) {
	191	next = &dev->states[idx];
	192	break;
	193	}
	194	}
	195
	196	/*
	197	* Should never hit this condition.
	198	*/
	199	WARN_ON(next == NULL);
	200
	201	/*
	202	* Drop to next valid state.
	203	* Start search from the next (lower) state.
	204	*/
	205	idx--;
	206	for (; idx >= OMAP3_STATE_C1; idx--) {
	207	struct omap3_processor_cx *cx;
	208
	209	cx = cpuidle_get_statedata(&dev->states[idx]);
	210	if (cx->valid) {
	211	next = &dev->states[idx];
	212	break;
	213	}
	214	}
	215	/*
	216	* C1 and C2 are always valid.
	217	* So, no need to check for 'next==NULL' outside this loop.
	218	*/
	219	}
	220
	221	return next;
	222	}
	223
99e6a4d2 RN	224	/**
	225	* omap3_enter_idle_bm - Checks for any bus activity
	226	* @dev: cpuidle device
	227	* @state: The target state to be programmed
	228	*
	229	* Used for C states with CPUIDLE_FLAG_CHECK_BM flag set. This
	230	* function checks for any pending activity and then programs the
	231	* device to the specified or a safer state.
	232	*/
	233	static int omap3_enter_idle_bm(struct cpuidle_device *dev,
	234	struct cpuidle_state *state)
	235	{
6af83b38	236	struct cpuidle_state *new_state = next_valid_state(dev, state);
e7410cf7 KH	237	u32 core_next_state, per_next_state = 0, per_saved_state = 0;
	238	u32 cam_state;
	239	struct omap3_processor_cx *cx;
	240	int ret;
0f724ed9	241
99e6a4d2	242	if ((state->flags & CPUIDLE_FLAG_CHECK_BM) && omap3_idle_bm_check()) {
0f724ed9 KH	243	BUG_ON(!dev->safe_state);
0f724ed9 KH	244	new_state = dev->safe_state;
e7410cf7 KH	245	goto select_state;
	246	}
	247
	248	cx = cpuidle_get_statedata(state);
	249	core_next_state = cx->core_state;
	250
	251	/*
	252	* FIXME: we currently manage device-specific idle states
	253	* for PER and CORE in combination with CPU-specific
	254	* idle states. This is wrong, and device-specific
	255	* idle managment needs to be separated out into
	256	* its own code.
	257	*/
	258
	259	/*
	260	* Prevent idle completely if CAM is active.
	261	* CAM does not have wakeup capability in OMAP3.
	262	*/
	263	cam_state = pwrdm_read_pwrst(cam_pd);
	264	if (cam_state == PWRDM_POWER_ON) {
	265	new_state = dev->safe_state;
	266	goto select_state;
	267	}
	268
	269	/*
	270	* Prevent PER off if CORE is not in retention or off as this
	271	* would disable PER wakeups completely.
	272	*/
	273	per_next_state = per_saved_state = pwrdm_read_next_pwrst(per_pd);
	274	if ((per_next_state == PWRDM_POWER_OFF) &&
65707fb3	275	(core_next_state > PWRDM_POWER_RET))
e7410cf7	276	per_next_state = PWRDM_POWER_RET;
0f724ed9	277
e7410cf7 KH	278	/* Are we changing PER target state? */
	279	if (per_next_state != per_saved_state)
	280	pwrdm_set_next_pwrst(per_pd, per_next_state);
	281
	282	select_state:
0f724ed9	283	dev->last_state = new_state;
e7410cf7 KH	284	ret = omap3_enter_idle(dev, new_state);
	285
	286	/* Restore original PER state if it was modified */
	287	if (per_next_state != per_saved_state)
	288	pwrdm_set_next_pwrst(per_pd, per_saved_state);
	289
	290	return ret;
99e6a4d2 RN	291	}
	292
	293	DEFINE_PER_CPU(struct cpuidle_device, omap3_idle_dev);
	294
6af83b38 SP	295	/**
	296	* omap3_cpuidle_update_states - Update the cpuidle states.
	297	*
	298	* Currently, this function toggles the validity of idle states based upon
	299	* the flag 'enable_off_mode'. When the flag is set all states are valid.
	300	* Else, states leading to OFF state set to be invalid.
	301	*/
	302	void omap3_cpuidle_update_states(void)
	303	{
	304	int i;
	305
	306	for (i = OMAP3_STATE_C1; i < OMAP3_MAX_STATES; i++) {
	307	struct omap3_processor_cx *cx = &omap3_power_states[i];
	308
	309	if (enable_off_mode) {
	310	cx->valid = 1;
	311	} else {
	312	if ((cx->mpu_state == PWRDM_POWER_OFF) \|\|
	313	(cx->core_state == PWRDM_POWER_OFF))
	314	cx->valid = 0;
	315	}
	316	}
	317	}
	318
bb4de3df KH	319	void omap3_pm_init_cpuidle(struct cpuidle_params *cpuidle_board_params)
	320	{
	321	int i;
	322
	323	if (!cpuidle_board_params)
	324	return;
	325
	326	for (i = OMAP3_STATE_C1; i < OMAP3_MAX_STATES; i++) {
709731bb KJ	327	cpuidle_params_table[i].valid =
709731bb KJ	328	cpuidle_board_params[i].valid;
bb4de3df KH	329	cpuidle_params_table[i].sleep_latency =
	330	cpuidle_board_params[i].sleep_latency;
	331	cpuidle_params_table[i].wake_latency =
	332	cpuidle_board_params[i].wake_latency;
	333	cpuidle_params_table[i].threshold =
	334	cpuidle_board_params[i].threshold;
	335	}
	336	return;
	337	}
	338
99e6a4d2 RN	339	/* omap3_init_power_states - Initialises the OMAP3 specific C states.
	340	*
	341	* Below is the desciption of each C state.
06d8f065 PDS	342	* C1 . MPU WFI + Core active
	343	* C2 . MPU WFI + Core inactive
	344	* C3 . MPU CSWR + Core inactive
	345	* C4 . MPU OFF + Core inactive
	346	* C5 . MPU CSWR + Core CSWR
	347	* C6 . MPU OFF + Core CSWR
	348	* C7 . MPU OFF + Core OFF
99e6a4d2 RN	349	*/
	350	void omap_init_power_states(void)
	351	{
	352	/* C1 . MPU WFI + Core active */
709731bb KJ	353	omap3_power_states[OMAP3_STATE_C1].valid =
709731bb KJ	354	cpuidle_params_table[OMAP3_STATE_C1].valid;
99e6a4d2	355	omap3_power_states[OMAP3_STATE_C1].type = OMAP3_STATE_C1;
bb4de3df KH	356	omap3_power_states[OMAP3_STATE_C1].sleep_latency =
	357	cpuidle_params_table[OMAP3_STATE_C1].sleep_latency;
	358	omap3_power_states[OMAP3_STATE_C1].wakeup_latency =
	359	cpuidle_params_table[OMAP3_STATE_C1].wake_latency;
	360	omap3_power_states[OMAP3_STATE_C1].threshold =
	361	cpuidle_params_table[OMAP3_STATE_C1].threshold;
99e6a4d2 RN	362	omap3_power_states[OMAP3_STATE_C1].mpu_state = PWRDM_POWER_ON;
	363	omap3_power_states[OMAP3_STATE_C1].core_state = PWRDM_POWER_ON;
	364	omap3_power_states[OMAP3_STATE_C1].flags = CPUIDLE_FLAG_TIME_VALID;
	365
06d8f065	366	/* C2 . MPU WFI + Core inactive */
709731bb KJ	367	omap3_power_states[OMAP3_STATE_C2].valid =
709731bb KJ	368	cpuidle_params_table[OMAP3_STATE_C2].valid;
99e6a4d2	369	omap3_power_states[OMAP3_STATE_C2].type = OMAP3_STATE_C2;
bb4de3df KH	370	omap3_power_states[OMAP3_STATE_C2].sleep_latency =
	371	cpuidle_params_table[OMAP3_STATE_C2].sleep_latency;
	372	omap3_power_states[OMAP3_STATE_C2].wakeup_latency =
	373	cpuidle_params_table[OMAP3_STATE_C2].wake_latency;
	374	omap3_power_states[OMAP3_STATE_C2].threshold =
	375	cpuidle_params_table[OMAP3_STATE_C2].threshold;
06d8f065	376	omap3_power_states[OMAP3_STATE_C2].mpu_state = PWRDM_POWER_ON;
99e6a4d2	377	omap3_power_states[OMAP3_STATE_C2].core_state = PWRDM_POWER_ON;
e7410cf7 KH	378	omap3_power_states[OMAP3_STATE_C2].flags = CPUIDLE_FLAG_TIME_VALID \|
e7410cf7 KH	379	CPUIDLE_FLAG_CHECK_BM;
99e6a4d2	380
06d8f065	381	/* C3 . MPU CSWR + Core inactive */
709731bb KJ	382	omap3_power_states[OMAP3_STATE_C3].valid =
709731bb KJ	383	cpuidle_params_table[OMAP3_STATE_C3].valid;
99e6a4d2	384	omap3_power_states[OMAP3_STATE_C3].type = OMAP3_STATE_C3;
bb4de3df KH	385	omap3_power_states[OMAP3_STATE_C3].sleep_latency =
	386	cpuidle_params_table[OMAP3_STATE_C3].sleep_latency;
	387	omap3_power_states[OMAP3_STATE_C3].wakeup_latency =
	388	cpuidle_params_table[OMAP3_STATE_C3].wake_latency;
	389	omap3_power_states[OMAP3_STATE_C3].threshold =
	390	cpuidle_params_table[OMAP3_STATE_C3].threshold;
06d8f065	391	omap3_power_states[OMAP3_STATE_C3].mpu_state = PWRDM_POWER_RET;
99e6a4d2	392	omap3_power_states[OMAP3_STATE_C3].core_state = PWRDM_POWER_ON;
0f724ed9 KH	393	omap3_power_states[OMAP3_STATE_C3].flags = CPUIDLE_FLAG_TIME_VALID \|
0f724ed9 KH	394	CPUIDLE_FLAG_CHECK_BM;
99e6a4d2	395
06d8f065	396	/* C4 . MPU OFF + Core inactive */
709731bb KJ	397	omap3_power_states[OMAP3_STATE_C4].valid =
709731bb KJ	398	cpuidle_params_table[OMAP3_STATE_C4].valid;
99e6a4d2	399	omap3_power_states[OMAP3_STATE_C4].type = OMAP3_STATE_C4;
bb4de3df KH	400	omap3_power_states[OMAP3_STATE_C4].sleep_latency =
	401	cpuidle_params_table[OMAP3_STATE_C4].sleep_latency;
	402	omap3_power_states[OMAP3_STATE_C4].wakeup_latency =
	403	cpuidle_params_table[OMAP3_STATE_C4].wake_latency;
	404	omap3_power_states[OMAP3_STATE_C4].threshold =
	405	cpuidle_params_table[OMAP3_STATE_C4].threshold;
06d8f065 PDS	406	omap3_power_states[OMAP3_STATE_C4].mpu_state = PWRDM_POWER_OFF;
06d8f065 PDS	407	omap3_power_states[OMAP3_STATE_C4].core_state = PWRDM_POWER_ON;
99e6a4d2 RN	408	omap3_power_states[OMAP3_STATE_C4].flags = CPUIDLE_FLAG_TIME_VALID \|
	409	CPUIDLE_FLAG_CHECK_BM;
	410
06d8f065	411	/* C5 . MPU CSWR + Core CSWR*/
709731bb KJ	412	omap3_power_states[OMAP3_STATE_C5].valid =
709731bb KJ	413	cpuidle_params_table[OMAP3_STATE_C5].valid;
99e6a4d2	414	omap3_power_states[OMAP3_STATE_C5].type = OMAP3_STATE_C5;
bb4de3df KH	415	omap3_power_states[OMAP3_STATE_C5].sleep_latency =
	416	cpuidle_params_table[OMAP3_STATE_C5].sleep_latency;
	417	omap3_power_states[OMAP3_STATE_C5].wakeup_latency =
	418	cpuidle_params_table[OMAP3_STATE_C5].wake_latency;
	419	omap3_power_states[OMAP3_STATE_C5].threshold =
	420	cpuidle_params_table[OMAP3_STATE_C5].threshold;
06d8f065	421	omap3_power_states[OMAP3_STATE_C5].mpu_state = PWRDM_POWER_RET;
99e6a4d2 RN	422	omap3_power_states[OMAP3_STATE_C5].core_state = PWRDM_POWER_RET;
	423	omap3_power_states[OMAP3_STATE_C5].flags = CPUIDLE_FLAG_TIME_VALID \|
	424	CPUIDLE_FLAG_CHECK_BM;
	425
06d8f065	426	/* C6 . MPU OFF + Core CSWR */
709731bb KJ	427	omap3_power_states[OMAP3_STATE_C6].valid =
709731bb KJ	428	cpuidle_params_table[OMAP3_STATE_C6].valid;
99e6a4d2	429	omap3_power_states[OMAP3_STATE_C6].type = OMAP3_STATE_C6;
bb4de3df KH	430	omap3_power_states[OMAP3_STATE_C6].sleep_latency =
	431	cpuidle_params_table[OMAP3_STATE_C6].sleep_latency;
	432	omap3_power_states[OMAP3_STATE_C6].wakeup_latency =
	433	cpuidle_params_table[OMAP3_STATE_C6].wake_latency;
	434	omap3_power_states[OMAP3_STATE_C6].threshold =
	435	cpuidle_params_table[OMAP3_STATE_C6].threshold;
99e6a4d2	436	omap3_power_states[OMAP3_STATE_C6].mpu_state = PWRDM_POWER_OFF;
06d8f065	437	omap3_power_states[OMAP3_STATE_C6].core_state = PWRDM_POWER_RET;
99e6a4d2 RN	438	omap3_power_states[OMAP3_STATE_C6].flags = CPUIDLE_FLAG_TIME_VALID \|
99e6a4d2 RN	439	CPUIDLE_FLAG_CHECK_BM;
06d8f065 PDS	440
06d8f065 PDS	441	/* C7 . MPU OFF + Core OFF */
709731bb KJ	442	omap3_power_states[OMAP3_STATE_C7].valid =
709731bb KJ	443	cpuidle_params_table[OMAP3_STATE_C7].valid;
06d8f065	444	omap3_power_states[OMAP3_STATE_C7].type = OMAP3_STATE_C7;
bb4de3df KH	445	omap3_power_states[OMAP3_STATE_C7].sleep_latency =
	446	cpuidle_params_table[OMAP3_STATE_C7].sleep_latency;
	447	omap3_power_states[OMAP3_STATE_C7].wakeup_latency =
	448	cpuidle_params_table[OMAP3_STATE_C7].wake_latency;
	449	omap3_power_states[OMAP3_STATE_C7].threshold =
	450	cpuidle_params_table[OMAP3_STATE_C7].threshold;
06d8f065 PDS	451	omap3_power_states[OMAP3_STATE_C7].mpu_state = PWRDM_POWER_OFF;
	452	omap3_power_states[OMAP3_STATE_C7].core_state = PWRDM_POWER_OFF;
	453	omap3_power_states[OMAP3_STATE_C7].flags = CPUIDLE_FLAG_TIME_VALID \|
	454	CPUIDLE_FLAG_CHECK_BM;
99e6a4d2 RN	455	}
	456
	457	struct cpuidle_driver omap3_idle_driver = {
	458	.name = "omap3_idle",
	459	.owner = THIS_MODULE,
	460	};
	461
	462	/**
	463	* omap3_idle_init - Init routine for OMAP3 idle
	464	*
	465	* Registers the OMAP3 specific cpuidle driver with the cpuidle
	466	* framework with the valid set of states.
	467	*/
0343371e	468	int __init omap3_idle_init(void)
99e6a4d2 RN	469	{
	470	int i, count = 0;
	471	struct omap3_processor_cx *cx;
	472	struct cpuidle_state *state;
	473	struct cpuidle_device *dev;
	474
	475	mpu_pd = pwrdm_lookup("mpu_pwrdm");
20b01669	476	core_pd = pwrdm_lookup("core_pwrdm");
e7410cf7 KH	477	per_pd = pwrdm_lookup("per_pwrdm");
e7410cf7 KH	478	cam_pd = pwrdm_lookup("cam_pwrdm");
99e6a4d2 RN	479
	480	omap_init_power_states();
	481	cpuidle_register_driver(&omap3_idle_driver);
	482
	483	dev = &per_cpu(omap3_idle_dev, smp_processor_id());
	484
8e431edb	485	for (i = OMAP3_STATE_C1; i < OMAP3_MAX_STATES; i++) {
99e6a4d2 RN	486	cx = &omap3_power_states[i];
	487	state = &dev->states[count];
	488
	489	if (!cx->valid)
	490	continue;
	491	cpuidle_set_statedata(state, cx);
	492	state->exit_latency = cx->sleep_latency + cx->wakeup_latency;
	493	state->target_residency = cx->threshold;
	494	state->flags = cx->flags;
	495	state->enter = (state->flags & CPUIDLE_FLAG_CHECK_BM) ?
	496	omap3_enter_idle_bm : omap3_enter_idle;
	497	if (cx->type == OMAP3_STATE_C1)
	498	dev->safe_state = state;
	499	sprintf(state->name, "C%d", count+1);
	500	count++;
	501	}
	502
	503	if (!count)
	504	return -EINVAL;
	505	dev->state_count = count;
	506
6af83b38 SP	507	omap3_cpuidle_update_states();
6af83b38 SP	508
99e6a4d2 RN	509	if (cpuidle_register_device(dev)) {
	510	printk(KERN_ERR "%s: CPUidle register device failed\n",
	511	__func__);
	512	return -EIO;
	513	}
	514
	515	return 0;
	516	}
0343371e KJ	517	#else
	518	int __init omap3_idle_init(void)
	519	{
	520	return 0;
	521	}
99e6a4d2	522	#endif /* CONFIG_CPU_IDLE */