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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#define CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE (7)
36#define CPPC_AUTO_ACT_WINDOW_EXP_BIT_SIZE (3)
37#define CPPC_AUTO_ACT_WINDOW_MAX_SIG ((1 << CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE) - 1)
38#define CPPC_AUTO_ACT_WINDOW_MAX_EXP ((1 << CPPC_AUTO_ACT_WINDOW_EXP_BIT_SIZE) - 1)
39/* CPPC_AUTO_ACT_WINDOW_MAX_SIG is 127, so 128 and 129 will decay to 127 when writing */
40#define CPPC_AUTO_ACT_WINDOW_SIG_CARRY_THRESH 129
41
42#define CPPC_ENERGY_PERF_MAX (0xFF)
43
44/* Each register has the folowing format. */
45struct cpc_reg {
46 u8 descriptor;
47 u16 length;
48 u8 space_id;
49 u8 bit_width;
50 u8 bit_offset;
51 u8 access_width;
52 u64 address;
53} __packed;
54
55/*
56 * Each entry in the CPC table is either
57 * of type ACPI_TYPE_BUFFER or
58 * ACPI_TYPE_INTEGER.
59 */
60struct cpc_register_resource {
61 acpi_object_type type;
62 u64 __iomem *sys_mem_vaddr;
63 union {
64 struct cpc_reg reg;
65 u64 int_value;
66 } cpc_entry;
67};
68
69/* Container to hold the CPC details for each CPU */
70struct cpc_desc {
71 int num_entries;
72 int version;
73 int cpu_id;
74 int write_cmd_status;
75 int write_cmd_id;
76 /* Lock used for RMW operations in cpc_write() */
77 raw_spinlock_t rmw_lock;
78 struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT];
79 struct acpi_psd_package domain_info;
80 struct kobject kobj;
81};
82
83/* These are indexes into the per-cpu cpc_regs[]. Order is important. */
84enum cppc_regs {
85 HIGHEST_PERF,
86 NOMINAL_PERF,
87 LOW_NON_LINEAR_PERF,
88 LOWEST_PERF,
89 GUARANTEED_PERF,
90 DESIRED_PERF,
91 MIN_PERF,
92 MAX_PERF,
93 PERF_REDUC_TOLERANCE,
94 TIME_WINDOW,
95 CTR_WRAP_TIME,
96 REFERENCE_CTR,
97 DELIVERED_CTR,
98 PERF_LIMITED,
99 ENABLE,
100 AUTO_SEL_ENABLE,
101 AUTO_ACT_WINDOW,
102 ENERGY_PERF,
103 REFERENCE_PERF,
104 LOWEST_FREQ,
105 NOMINAL_FREQ,
106};
107
108/*
109 * Categorization of registers as described
110 * in the ACPI v.5.1 spec.
111 * XXX: Only filling up ones which are used by governors
112 * today.
113 */
114struct cppc_perf_caps {
115 u32 guaranteed_perf;
116 u32 highest_perf;
117 u32 nominal_perf;
118 u32 lowest_perf;
119 u32 lowest_nonlinear_perf;
120 u32 lowest_freq;
121 u32 nominal_freq;
122 u32 energy_perf;
123 bool auto_sel;
124};
125
126struct cppc_perf_ctrls {
127 u32 max_perf;
128 u32 min_perf;
129 u32 desired_perf;
130 u32 energy_perf;
131};
132
133struct cppc_perf_fb_ctrs {
134 u64 reference;
135 u64 delivered;
136 u64 reference_perf;
137 u64 wraparound_time;
138};
139
140/* Per CPU container for runtime CPPC management. */
141struct cppc_cpudata {
142 struct list_head node;
143 struct cppc_perf_caps perf_caps;
144 struct cppc_perf_ctrls perf_ctrls;
145 struct cppc_perf_fb_ctrs perf_fb_ctrs;
146 unsigned int shared_type;
147 cpumask_var_t shared_cpu_map;
148};
149
150#ifdef CONFIG_ACPI_CPPC_LIB
151extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);
152extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf);
153extern int cppc_get_highest_perf(int cpunum, u64 *highest_perf);
154extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
155extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
156extern int cppc_set_enable(int cpu, bool enable);
157extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
158extern bool cppc_perf_ctrs_in_pcc(void);
159extern unsigned int cppc_perf_to_khz(struct cppc_perf_caps *caps, unsigned int perf);
160extern unsigned int cppc_khz_to_perf(struct cppc_perf_caps *caps, unsigned int freq);
161extern bool acpi_cpc_valid(void);
162extern bool cppc_allow_fast_switch(void);
163extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data);
164extern unsigned int cppc_get_transition_latency(int cpu);
165extern bool cpc_ffh_supported(void);
166extern bool cpc_supported_by_cpu(void);
167extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
168extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
169extern int cppc_get_epp_perf(int cpunum, u64 *epp_perf);
170extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable);
171extern int cppc_set_epp(int cpu, u64 epp_val);
172extern int cppc_get_auto_act_window(int cpu, u64 *auto_act_window);
173extern int cppc_set_auto_act_window(int cpu, u64 auto_act_window);
174extern int cppc_get_auto_sel(int cpu, bool *enable);
175extern int cppc_set_auto_sel(int cpu, bool enable);
176extern int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf);
177extern int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator);
178extern int amd_detect_prefcore(bool *detected);
179#else /* !CONFIG_ACPI_CPPC_LIB */
180static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
181{
182 return -EOPNOTSUPP;
183}
184static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
185{
186 return -EOPNOTSUPP;
187}
188static inline int cppc_get_highest_perf(int cpunum, u64 *highest_perf)
189{
190 return -EOPNOTSUPP;
191}
192static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
193{
194 return -EOPNOTSUPP;
195}
196static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
197{
198 return -EOPNOTSUPP;
199}
200static inline int cppc_set_enable(int cpu, bool enable)
201{
202 return -EOPNOTSUPP;
203}
204static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps)
205{
206 return -EOPNOTSUPP;
207}
208static inline bool cppc_perf_ctrs_in_pcc(void)
209{
210 return false;
211}
212static inline bool acpi_cpc_valid(void)
213{
214 return false;
215}
216static inline bool cppc_allow_fast_switch(void)
217{
218 return false;
219}
220static inline unsigned int cppc_get_transition_latency(int cpu)
221{
222 return CPUFREQ_ETERNAL;
223}
224static inline bool cpc_ffh_supported(void)
225{
226 return false;
227}
228static inline int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val)
229{
230 return -EOPNOTSUPP;
231}
232static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
233{
234 return -EOPNOTSUPP;
235}
236static inline int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable)
237{
238 return -EOPNOTSUPP;
239}
240static inline int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
241{
242 return -EOPNOTSUPP;
243}
244static inline int cppc_set_epp(int cpu, u64 epp_val)
245{
246 return -EOPNOTSUPP;
247}
248static inline int cppc_get_auto_act_window(int cpu, u64 *auto_act_window)
249{
250 return -EOPNOTSUPP;
251}
252static inline int cppc_set_auto_act_window(int cpu, u64 auto_act_window)
253{
254 return -EOPNOTSUPP;
255}
256static inline int cppc_get_auto_sel(int cpu, bool *enable)
257{
258 return -EOPNOTSUPP;
259}
260static inline int cppc_set_auto_sel(int cpu, bool enable)
261{
262 return -EOPNOTSUPP;
263}
264static inline int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf)
265{
266 return -ENODEV;
267}
268static inline int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator)
269{
270 return -EOPNOTSUPP;
271}
272static inline int amd_detect_prefcore(bool *detected)
273{
274 return -ENODEV;
275}
276#endif /* !CONFIG_ACPI_CPPC_LIB */
277
278#endif /* _CPPC_ACPI_H*/