dpm.h

the attached file is the source code of dynamic power mangement

/*
 * linux/include/asm-arm/arch-mp200/dpm.h
 * MP200-specific definitions for DPM
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Copyright (C) 2005 MontaVista Software <[e-mail]>
 * Copyright (C) 2005-2006 NEC Electronics Corporation
 *
 * Based on arch/ppc/platforms/ibm405lp_dpm.h by Bishop Brock.
 *
 */

#ifndef __ASM_ARM_ARCH_MP200_DPM_H
#define __ASM_ARM_ARCH_MP200_DPM_H

/*
 * machine dependent operating state
 *
 * An operating state is a cpu execution state that has implications for power
 * management. The DPM will select operating points based largely on the
 * current operating state.
 *
 * DPM_STATES is the number of supported operating states. Valid operating
 * states are from 0 to DPM_STATES-1 but when setting an operating state the
 * kernel should only specify a state from the set of "base states" and should
 * do so by name.  During the context switch the new operating state is simply
 * extracted from current->dpm_state.
 *
 * task states:
 *
 * APIs that reference task states use the range -(DPM_TASK_STATE_LIMIT + 1)
 * through +DPM_TASK_STATE_LIMIT.  This value is added to DPM_TASK_STATE to
 * obtain the downward or upward adjusted task state value. The
 * -(DPM_TASK_STATE_LIMIT + 1) value is interpreted specially, and equates to
 * DPM_NO_STATE.
 *
 * Tasks inherit their task operating states across calls to
 * fork(). DPM_TASK_STATE is the default operating state for all tasks, and is
 * inherited from init.  Tasks can change (or have changed) their tasks states
 * using the DPM_SET_TASK_STATE variant of the sys_dpm() system call.  */

#define DPM_IDLE_TASK_STATE	0
#define DPM_IDLE_STATE		1
#define DPM_SLEEP_STATE		2
#define DPM_BASE_STATES		3

#define DPM_TASK_STATE_LIMIT	4
#define DPM_TASK_STATE		(DPM_BASE_STATES + DPM_TASK_STATE_LIMIT)
#define DPM_STATES		(DPM_TASK_STATE + DPM_TASK_STATE_LIMIT + 1)
#define DPM_TASK_STATES		(DPM_STATES - DPM_BASE_STATES)

#define DPM_STATE_NAMES				\
{						\
	"idle-task", "idle", "sleep",		\
	"task-4", "task-3", "task-2", "task-1",	\
	"task",					\
	"task+1", "task+2", "task+3", "task+4"	\
}

#define DPM_PARAM_NAMES		\
{				\
	"logic0-volts",		\
	"logic1-volts",		\
	"cpu-freq",		\
	"sleep-mode"		\
}

/* MD operating point parameters */
#define DPM_MD_V_L0		0
#define DPM_MD_V_L1		1
#define DPM_MD_CPU		2
#define DPM_MD_SLEEP_MODE	3

#define DPM_PP_NBR		4

#ifdef __KERNEL__
#ifndef __ASSEMBLER__

#include <linux/types.h>
#include <asm/arch/timer.h>

typedef __u64 dpm_md_count_t;
typedef __u64 dpm_md_time_t;

/* Time in microseconds for dpm stats */
#define dpm_md_time()		mp200_system_timer_read(TIMER_KFI)

/* Instances of this structure define valid Innovator operating points for DPM.
   Voltages are represented in mV, and frequencies are represented in KHz. */

struct dpm_md_opt {
	int v0;			/* Logic0 voltage in mV */
	int v1;			/* Logic1 voltage in mV */
	int cpu;		/* cpu mode */
	int sleep_mode;		/* sleep mode */
};

#endif				/* __ASSEMBLER__ */
#endif				/* __KERNEL__ */

#endif				/* __ASM_ARM_ARCH_MP200_DPM_H */