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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 <ashwin.chaugule@linaro.org>
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/* CPPCv2 and CPPCv3 support */
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 /* Lock used for RMW operations in cpc_write() */
68 raw_spinlock_t rmw_lock;
69 struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT];
70 struct acpi_psd_package domain_info;
71 struct kobject kobj;
72};
73
74/* These are indexes into the per-cpu cpc_regs[]. Order is important. */
75enum cppc_regs {
76 HIGHEST_PERF,
77 NOMINAL_PERF,
78 LOW_NON_LINEAR_PERF,
79 LOWEST_PERF,
80 GUARANTEED_PERF,
81 DESIRED_PERF,
82 MIN_PERF,
83 MAX_PERF,
84 PERF_REDUC_TOLERANCE,
85 TIME_WINDOW,
86 CTR_WRAP_TIME,
87 REFERENCE_CTR,
88 DELIVERED_CTR,
89 PERF_LIMITED,
90 ENABLE,
91 AUTO_SEL_ENABLE,
92 AUTO_ACT_WINDOW,
93 ENERGY_PERF,
94 REFERENCE_PERF,
95 LOWEST_FREQ,
96 NOMINAL_FREQ,
97};
98
99/*
100 * Categorization of registers as described
101 * in the ACPI v.5.1 spec.
102 * XXX: Only filling up ones which are used by governors
103 * today.
104 */
105struct cppc_perf_caps {
106 u32 guaranteed_perf;
107 u32 highest_perf;
108 u32 nominal_perf;
109 u32 lowest_perf;
110 u32 lowest_nonlinear_perf;
111 u32 lowest_freq;
112 u32 nominal_freq;
113 u32 energy_perf;
114 bool auto_sel;
115};
116
117struct cppc_perf_ctrls {
118 u32 max_perf;
119 u32 min_perf;
120 u32 desired_perf;
121 u32 energy_perf;
122};
123
124struct cppc_perf_fb_ctrs {
125 u64 reference;
126 u64 delivered;
127 u64 reference_perf;
128 u64 wraparound_time;
129};
130
131/* Per CPU container for runtime CPPC management. */
132struct cppc_cpudata {
133 struct list_head node;
134 struct cppc_perf_caps perf_caps;
135 struct cppc_perf_ctrls perf_ctrls;
136 struct cppc_perf_fb_ctrs perf_fb_ctrs;
137 unsigned int shared_type;
138 cpumask_var_t shared_cpu_map;
139};
140
141#ifdef CONFIG_ACPI_CPPC_LIB
142extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);
143extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf);
144extern int cppc_get_highest_perf(int cpunum, u64 *highest_perf);
145extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
146extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
147extern int cppc_set_enable(int cpu, bool enable);
148extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
149extern bool cppc_perf_ctrs_in_pcc(void);
150extern unsigned int cppc_perf_to_khz(struct cppc_perf_caps *caps, unsigned int perf);
151extern unsigned int cppc_khz_to_perf(struct cppc_perf_caps *caps, unsigned int freq);
152extern bool acpi_cpc_valid(void);
153extern bool cppc_allow_fast_switch(void);
154extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data);
155extern unsigned int cppc_get_transition_latency(int cpu);
156extern bool cpc_ffh_supported(void);
157extern bool cpc_supported_by_cpu(void);
158extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
159extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
160extern int cppc_get_epp_perf(int cpunum, u64 *epp_perf);
161extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable);
162extern int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps);
163extern int cppc_set_auto_sel(int cpu, bool enable);
164extern int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf);
165extern int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator);
166extern int amd_detect_prefcore(bool *detected);
167#else /* !CONFIG_ACPI_CPPC_LIB */
168static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
169{
170 return -EOPNOTSUPP;
171}
172static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
173{
174 return -EOPNOTSUPP;
175}
176static inline int cppc_get_highest_perf(int cpunum, u64 *highest_perf)
177{
178 return -EOPNOTSUPP;
179}
180static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
181{
182 return -EOPNOTSUPP;
183}
184static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
185{
186 return -EOPNOTSUPP;
187}
188static inline int cppc_set_enable(int cpu, bool enable)
189{
190 return -EOPNOTSUPP;
191}
192static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps)
193{
194 return -EOPNOTSUPP;
195}
196static inline bool cppc_perf_ctrs_in_pcc(void)
197{
198 return false;
199}
200static inline bool acpi_cpc_valid(void)
201{
202 return false;
203}
204static inline bool cppc_allow_fast_switch(void)
205{
206 return false;
207}
208static inline unsigned int cppc_get_transition_latency(int cpu)
209{
210 return CPUFREQ_ETERNAL;
211}
212static inline bool cpc_ffh_supported(void)
213{
214 return false;
215}
216static inline int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val)
217{
218 return -EOPNOTSUPP;
219}
220static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
221{
222 return -EOPNOTSUPP;
223}
224static inline int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable)
225{
226 return -EOPNOTSUPP;
227}
228static inline int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
229{
230 return -EOPNOTSUPP;
231}
232static inline int cppc_set_auto_sel(int cpu, bool enable)
233{
234 return -EOPNOTSUPP;
235}
236static inline int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps)
237{
238 return -EOPNOTSUPP;
239}
240static inline int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf)
241{
242 return -ENODEV;
243}
244static inline int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator)
245{
246 return -EOPNOTSUPP;
247}
248static inline int amd_detect_prefcore(bool *detected)
249{
250 return -ENODEV;
251}
252#endif /* !CONFIG_ACPI_CPPC_LIB */
253
254#endif /* _CPPC_ACPI_H*/