projects/linux·blob 9e795d94 · refs

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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * CPPC (Collaborative Processor Performance Control) methods used
4 * by CPUfreq drivers.
5 *
6 * (C) Copyright 2014, 2015 Linaro Ltd.
7 * Author: Ashwin Chaugule <[email protected]>
8 */
9
10#ifndef _CPPC_ACPI_H
11#define _CPPC_ACPI_H
12
13#include <linux/acpi.h>
14#include <linux/cpufreq.h>
15#include <linux/types.h>
16
17#include <acpi/pcc.h>
18#include <acpi/processor.h>
19
20/* Support CPPCv2 and CPPCv3 */
21#define CPPC_V2_REV 2
22#define CPPC_V3_REV 3
23#define CPPC_V2_NUM_ENT 21
24#define CPPC_V3_NUM_ENT 23
25
26#define PCC_CMD_COMPLETE_MASK (1 << 0)
27#define PCC_ERROR_MASK (1 << 2)
28
29#define MAX_CPC_REG_ENT 21
30
31/* CPPC specific PCC commands. */
32#define CMD_READ 0
33#define CMD_WRITE 1
34
35/* Each register has the folowing format. */
36struct cpc_reg {
37 u8 descriptor;
38 u16 length;
39 u8 space_id;
40 u8 bit_width;
41 u8 bit_offset;
42 u8 access_width;
43 u64 address;
44} __packed;
45
46/*
47 * Each entry in the CPC table is either
48 * of type ACPI_TYPE_BUFFER or
49 * ACPI_TYPE_INTEGER.
50 */
51struct cpc_register_resource {
52 acpi_object_type type;
53 u64 __iomem *sys_mem_vaddr;
54 union {
55 struct cpc_reg reg;
56 u64 int_value;
57 } cpc_entry;
58};
59
60/* Container to hold the CPC details for each CPU */
61struct cpc_desc {
62 int num_entries;
63 int version;
64 int cpu_id;
65 int write_cmd_status;
66 int write_cmd_id;
67 struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT];
68 struct acpi_psd_package domain_info;
69 struct kobject kobj;
70};
71
72/* These are indexes into the per-cpu cpc_regs[]. Order is important. */
73enum cppc_regs {
74 HIGHEST_PERF,
75 NOMINAL_PERF,
76 LOW_NON_LINEAR_PERF,
77 LOWEST_PERF,
78 GUARANTEED_PERF,
79 DESIRED_PERF,
80 MIN_PERF,
81 MAX_PERF,
82 PERF_REDUC_TOLERANCE,
83 TIME_WINDOW,
84 CTR_WRAP_TIME,
85 REFERENCE_CTR,
86 DELIVERED_CTR,
87 PERF_LIMITED,
88 ENABLE,
89 AUTO_SEL_ENABLE,
90 AUTO_ACT_WINDOW,
91 ENERGY_PERF,
92 REFERENCE_PERF,
93 LOWEST_FREQ,
94 NOMINAL_FREQ,
95};
96
97/*
98 * Categorization of registers as described
99 * in the ACPI v.5.1 spec.
100 * XXX: Only filling up ones which are used by governors
101 * today.
102 */
103struct cppc_perf_caps {
104 u32 guaranteed_perf;
105 u32 highest_perf;
106 u32 nominal_perf;
107 u32 lowest_perf;
108 u32 lowest_nonlinear_perf;
109 u32 lowest_freq;
110 u32 nominal_freq;
111};
112
113struct cppc_perf_ctrls {
114 u32 max_perf;
115 u32 min_perf;
116 u32 desired_perf;
117};
118
119struct cppc_perf_fb_ctrs {
120 u64 reference;
121 u64 delivered;
122 u64 reference_perf;
123 u64 wraparound_time;
124};
125
126/* Per CPU container for runtime CPPC management. */
127struct cppc_cpudata {
128 struct list_head node;
129 struct cppc_perf_caps perf_caps;
130 struct cppc_perf_ctrls perf_ctrls;
131 struct cppc_perf_fb_ctrs perf_fb_ctrs;
132 unsigned int shared_type;
133 cpumask_var_t shared_cpu_map;
134};
135
136#ifdef CONFIG_ACPI_CPPC_LIB
137extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);
138extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf);
139extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
140extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
141extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
142extern bool acpi_cpc_valid(void);
143extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data);
144extern unsigned int cppc_get_transition_latency(int cpu);
145extern bool cpc_ffh_supported(void);
146extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
147extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
148#else /* !CONFIG_ACPI_CPPC_LIB */
149static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
150{
151 return -ENOTSUPP;
152}
153static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
154{
155 return -ENOTSUPP;
156}
157static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
158{
159 return -ENOTSUPP;
160}
161static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
162{
163 return -ENOTSUPP;
164}
165static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps)
166{
167 return -ENOTSUPP;
168}
169static inline bool acpi_cpc_valid(void)
170{
171 return false;
172}
173static inline unsigned int cppc_get_transition_latency(int cpu)
174{
175 return CPUFREQ_ETERNAL;
176}
177static inline bool cpc_ffh_supported(void)
178{
179 return false;
180}
181static inline int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val)
182{
183 return -ENOTSUPP;
184}
185static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
186{
187 return -ENOTSUPP;
188}
189#endif /* !CONFIG_ACPI_CPPC_LIB */
190
191#endif /* _CPPC_ACPI_H*/