linux/include/acpi/cppc_acpi.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * CPPC (Collaborative Processor Performance Control) methods used
 * by CPUfreq drivers.
 *
 * (C) Copyright 2014, 2015 Linaro Ltd.
 * Author: Ashwin Chaugule <[email protected]>
 */

#ifndef _CPPC_ACPI_H
#define _CPPC_ACPI_H

#include <linux/acpi.h>
#include <linux/cpufreq.h>
#include <linux/types.h>

#include <acpi/pcc.h>
#include <acpi/processor.h>

/* CPPCv2 and CPPCv3 support */
#define CPPC_V2_REV …
#define CPPC_V3_REV …
#define CPPC_V2_NUM_ENT …
#define CPPC_V3_NUM_ENT …

#define PCC_CMD_COMPLETE_MASK …
#define PCC_ERROR_MASK …

#define MAX_CPC_REG_ENT …

/* CPPC specific PCC commands. */
#define CMD_READ …
#define CMD_WRITE …

/* Each register has the folowing format. */
struct cpc_reg { … } __packed;

/*
 * Each entry in the CPC table is either
 * of type ACPI_TYPE_BUFFER or
 * ACPI_TYPE_INTEGER.
 */
struct cpc_register_resource { … };

/* Container to hold the CPC details for each CPU */
struct cpc_desc { … };

/* These are indexes into the per-cpu cpc_regs[]. Order is important. */
enum cppc_regs { … };

/*
 * Categorization of registers as described
 * in the ACPI v.5.1 spec.
 * XXX: Only filling up ones which are used by governors
 * today.
 */
struct cppc_perf_caps { … };

struct cppc_perf_ctrls { … };

struct cppc_perf_fb_ctrs { … };

/* Per CPU container for runtime CPPC management. */
struct cppc_cpudata { … };

#ifdef CONFIG_ACPI_CPPC_LIB
extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);
extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf);
extern int cppc_get_highest_perf(int cpunum, u64 *highest_perf);
extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
extern int cppc_set_enable(int cpu, bool enable);
extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
extern bool cppc_perf_ctrs_in_pcc(void);
extern unsigned int cppc_perf_to_khz(struct cppc_perf_caps *caps, unsigned int perf);
extern unsigned int cppc_khz_to_perf(struct cppc_perf_caps *caps, unsigned int freq);
extern bool acpi_cpc_valid(void);
extern bool cppc_allow_fast_switch(void);
extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data);
extern unsigned int cppc_get_transition_latency(int cpu);
extern bool cpc_ffh_supported(void);
extern bool cpc_supported_by_cpu(void);
extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
extern int cppc_get_epp_perf(int cpunum, u64 *epp_perf);
extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable);
extern int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps);
extern int cppc_set_auto_sel(int cpu, bool enable);
#else /* !CONFIG_ACPI_CPPC_LIB */
static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
{
	return -ENOTSUPP;
}
static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
{
	return -ENOTSUPP;
}
static inline int cppc_get_highest_perf(int cpunum, u64 *highest_perf)
{
	return -ENOTSUPP;
}
static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
{
	return -ENOTSUPP;
}
static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
{
	return -ENOTSUPP;
}
static inline int cppc_set_enable(int cpu, bool enable)
{
	return -ENOTSUPP;
}
static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps)
{
	return -ENOTSUPP;
}
static inline bool cppc_perf_ctrs_in_pcc(void)
{
	return false;
}
static inline bool acpi_cpc_valid(void)
{
	return false;
}
static inline bool cppc_allow_fast_switch(void)
{
	return false;
}
static inline unsigned int cppc_get_transition_latency(int cpu)
{
	return CPUFREQ_ETERNAL;
}
static inline bool cpc_ffh_supported(void)
{
	return false;
}
static inline int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val)
{
	return -ENOTSUPP;
}
static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
{
	return -ENOTSUPP;
}
static inline int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable)
{
	return -ENOTSUPP;
}
static inline int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
{
	return -ENOTSUPP;
}
static inline int cppc_set_auto_sel(int cpu, bool enable)
{
	return -ENOTSUPP;
}
static inline int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps)
{
	return -ENOTSUPP;
}
#endif /* !CONFIG_ACPI_CPPC_LIB */

#endif /* _CPPC_ACPI_H*/