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/*
* CPPC (Collaborative Processor Performance Control) methods used
* by CPUfreq drivers.
*
* (C) Copyright 2014, 2015 Linaro Ltd.
* Author: Ashwin Chaugule <ashwin.chaugule@linaro.org>
*
* 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; version 2
* of the License.
*/
#ifndef _CPPC_ACPI_H
#define _CPPC_ACPI_H
#include <linux/acpi.h>
#include <linux/mailbox_controller.h>
#include <linux/mailbox_client.h>
#include <linux/types.h>
#include <acpi/processor.h>
/* Only support CPPCv2 for now. */
#define CPPC_NUM_ENT 21
#define CPPC_REV 2
#define PCC_CMD_COMPLETE 1
#define MAX_CPC_REG_ENT 19
/* CPPC specific PCC commands. */
#define CMD_READ 0
#define CMD_WRITE 1
/* Each register has the folowing format. */
struct cpc_reg {
u8 descriptor;
u16 length;
u8 space_id;
u8 bit_width;
u8 bit_offset;
u8 access_width;
u64 __iomem address;
} __packed;
/*
* Each entry in the CPC table is either
* of type ACPI_TYPE_BUFFER or
* ACPI_TYPE_INTEGER.
*/
struct cpc_register_resource {
acpi_object_type type;
union {
struct cpc_reg reg;
u64 int_value;
} cpc_entry;
};
/* Container to hold the CPC details for each CPU */
struct cpc_desc {
int num_entries;
int version;
int cpu_id;
struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT];
struct acpi_psd_package domain_info;
};
/* These are indexes into the per-cpu cpc_regs[]. Order is important. */
enum cppc_regs {
HIGHEST_PERF,
NOMINAL_PERF,
LOW_NON_LINEAR_PERF,
LOWEST_PERF,
GUARANTEED_PERF,
DESIRED_PERF,
MIN_PERF,
MAX_PERF,
PERF_REDUC_TOLERANCE,
TIME_WINDOW,
CTR_WRAP_TIME,
REFERENCE_CTR,
DELIVERED_CTR,
PERF_LIMITED,
ENABLE,
AUTO_SEL_ENABLE,
AUTO_ACT_WINDOW,
ENERGY_PERF,
REFERENCE_PERF,
};
/*
* 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 {
u32 highest_perf;
u32 nominal_perf;
u32 reference_perf;
u32 lowest_perf;
};
struct cppc_perf_ctrls {
u32 max_perf;
u32 min_perf;
u32 desired_perf;
};
struct cppc_perf_fb_ctrs {
u64 reference;
u64 prev_reference;
u64 delivered;
u64 prev_delivered;
};
/* Per CPU container for runtime CPPC management. */
struct cpudata {
int cpu;
struct cppc_perf_caps perf_caps;
struct cppc_perf_ctrls perf_ctrls;
struct cppc_perf_fb_ctrs perf_fb_ctrs;
struct cpufreq_policy *cur_policy;
unsigned int shared_type;
cpumask_var_t shared_cpu_map;
};
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_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
extern int acpi_get_psd_map(struct cpudata **);
/* Methods to interact with the PCC mailbox controller. */
extern struct mbox_chan *
pcc_mbox_request_channel(struct mbox_client *, unsigned int);
#endif /* _CPPC_ACPI_H*/
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