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      1 /*	$NetBSD: cpufreq.h,v 1.5 2011/10/27 05:13:04 jruoho Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jukka Ruohonen.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  *
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 #ifndef	_SYS_CPUFREQ_H_
     33 #define	_SYS_CPUFREQ_H_
     34 
     35 #ifndef _KERNEL
     36 #include <stdbool.h>
     37 #endif
     38 
     39 #ifdef _KERNEL
     40 #ifndef _SYS_XCALL_H_
     41 #include <sys/xcall.h>
     42 #endif
     43 #endif
     44 
     45 #define CPUFREQ_NAME_MAX	 16
     46 #define CPUFREQ_STATE_MAX	 32
     47 #define CPUFREQ_LATENCY_MAX	 UINT32_MAX
     48 
     49 #define CPUFREQ_STATE_ENABLED	 UINT32_MAX
     50 #define CPUFREQ_STATE_DISABLED	 UINT32_MAX - 1
     51 
     52 struct cpufreq_state {
     53 	uint32_t		 cfs_freq;	  /* MHz  */
     54 	uint32_t		 cfs_power;	  /* mW   */
     55 	uint32_t		 cfs_latency;	  /* usec */
     56 	uint32_t		 cfs_index;
     57 	uint32_t		 cfs_reserved[5];
     58 };
     59 
     60 struct cpufreq {
     61 	char			 cf_name[CPUFREQ_NAME_MAX];
     62 	uint32_t		 cf_state_count;
     63 	uint32_t		 cf_state_target;
     64 	uint32_t		 cf_state_current;
     65 	uint32_t		 cf_reserved[5];
     66 	u_int			 cf_index;
     67 
     68 #ifdef _KERNEL
     69 	bool			 cf_mp;
     70 	bool			 cf_init;
     71 	void			*cf_cookie;
     72 	xcfunc_t		 cf_get_freq;
     73 	xcfunc_t		 cf_set_freq;
     74 	uint32_t		 cf_state_saved;
     75 	struct cpufreq_state	 cf_state[CPUFREQ_STATE_MAX];
     76 #endif	/* _KERNEL */
     77 };
     78 
     79 #ifdef _KERNEL
     80 void		cpufreq_init(void);
     81 int		cpufreq_register(struct cpufreq *);
     82 void		cpufreq_deregister(void);
     83 void		cpufreq_suspend(struct cpu_info *);
     84 void		cpufreq_resume(struct cpu_info *);
     85 uint32_t	cpufreq_get(struct cpu_info *);
     86 int		cpufreq_get_backend(struct cpufreq *);
     87 int		cpufreq_get_state(uint32_t, struct cpufreq_state *);
     88 int		cpufreq_get_state_index(uint32_t, struct cpufreq_state *);
     89 void		cpufreq_set(struct cpu_info *, uint32_t);
     90 void		cpufreq_set_all(uint32_t);
     91 #endif	/* _KERNEL */
     92 
     93 #endif /* _SYS_CPUFREQ_H_ */
     94