/*
 * drivers/cpufreq/autohotplug.h
 *
 * Copyright (C) 2016-2020 Allwinnertech.
 * East Yang <yangdong@allwinnertech.com>

 * 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.
 */

#ifndef __AUTOHOTPLUG__
#define __AUTOHOTPLUG__

#define INVALID_LOAD    0xffffffff
#define INVALID_CPU     0xffffffff

#define STABLE_DOWN           0
#define STABLE_UP             1
#define STABLE_BOOST          2
#define STABLE_LAST_BIG       3

#if defined(CONFIG_SCHED_HMP)
	#define AUTOHOTPLUG_SUNXI_SYSFS_MAX (7)
#elif defined(CONFIG_SCHED_SMP_DCMP)
	#define AUTOHOTPLUG_SUNXI_SYSFS_MAX (2)
#else
	#define AUTOHOTPLUG_SUNXI_SYSFS_MAX (0)
#endif

#ifdef CONFIG_CPU_AUTOHOTPLUG_STATS
	#define AUTOHOTPLUG_STATS_SYSFS_MAX (3 * (CONFIG_NR_CPUS))
#else
	#define AUTOHOTPLUG_STATS_SYSFS_MAX (0)
#endif

#define HOTPLUG_DATA_SYSFS_MAX (9 + AUTOHOTPLUG_SUNXI_SYSFS_MAX + \
					AUTOHOTPLUG_STATS_SYSFS_MAX)

struct autohotplug_loadinfo {
	unsigned int  cpu_load[CONFIG_NR_CPUS];
	unsigned int  cpu_load_relative[CONFIG_NR_CPUS];
	unsigned int  max_load;
	unsigned int  min_load;
	unsigned int  max_cpu;
	unsigned int  min_cpu;
	unsigned int  big_min_load;
};

struct autohotplug_governor_loadinfo {
	struct timer_list cpu_timer;
	struct autohotplug_loadinfo load;
};

struct autohotplug_cpuinfo {
	spinlock_t load_lock; /* protects the next 4 fields */
	u64 time_in_idle;
	u64 time_in_idle_timestamp;
};

struct autohotplug_global_attr {
	struct attribute attr;
	ssize_t (*show)(struct kobject *kobj,
			struct attribute *attr, char *buf);
	ssize_t (*store)(struct kobject *a, struct attribute *b,
			const char *c, size_t count);
	unsigned int *value;
	unsigned int (*to_sysfs)(unsigned int, unsigned int *);
	unsigned int (*from_sysfs)(unsigned int, unsigned int *);
};

struct autohotplug_data_struct {
	struct attribute_group attr_group;
	struct attribute *attributes[HOTPLUG_DATA_SYSFS_MAX + 1];
	struct autohotplug_global_attr attr[HOTPLUG_DATA_SYSFS_MAX];
};

struct autohotplug_governor {
	void (*init_attr)(void);
	int  (*get_fast_and_slow_cpus)(struct cpumask *hmp_fast_cpu_mask,
			struct cpumask *hmp_slow_cpu_mask);
	int  (*try_up)(struct autohotplug_loadinfo *load);
	int  (*try_down)(struct autohotplug_loadinfo *load);
	void (*try_freq_limit)(void);
};

extern unsigned int is_cpu_big(int cpu);
extern unsigned int is_cpu_little(int cpu);
extern int do_cpu_down(unsigned int cpu);
extern int try_up_little(void);
extern int try_up_big(void);

extern void autohotplug_attr_add(const char *name,
		unsigned int *value, umode_t mode,
		unsigned int (*to_sysfs)(unsigned int, unsigned int *),
		unsigned int (*from_sysfs)(unsigned int, unsigned int*));
extern int get_cpus_under(struct autohotplug_loadinfo *load,
				unsigned char level, unsigned int *first);
extern int get_bigs_above(struct autohotplug_loadinfo *load,
				unsigned char level, unsigned int *first);
extern int get_littles_under(struct autohotplug_loadinfo *load,
				unsigned char level, unsigned int *first);
extern int get_bigs_under(struct autohotplug_loadinfo *load,
				unsigned char level, unsigned int *first);
extern int get_cpus_stable_under(struct autohotplug_loadinfo *load,
		unsigned char level, unsigned int *first, int is_up);
extern int get_cpus_online(struct autohotplug_loadinfo *load,
				int *little, int *big);

extern struct autohotplug_governor autohotplug_smart;

extern unsigned int  load_try_down;
extern unsigned int  load_try_up;
extern unsigned long cpu_up_lasttime;
extern unsigned int  load_up_stable_us;
extern unsigned int  load_down_stable_us;
#ifdef CONFIG_SCHED_HMP
extern void __init arch_get_fast_and_slow_cpus(struct cpumask *fast,
						struct cpumask *slow);
#endif

#endif  /* #ifndef __AUTOHOTPLUG__ */