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. */ 36 struct 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 */ 51 struct 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 */ 61 struct 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. */ 73 enum 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 */ 103 struct 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 u32 energy_perf; 112 }; 113 114 struct cppc_perf_ctrls { 115 u32 max_perf; 116 u32 min_perf; 117 u32 desired_perf; 118 u32 energy_perf; 119 }; 120 121 struct cppc_perf_fb_ctrs { 122 u64 reference; 123 u64 delivered; 124 u64 reference_perf; 125 u64 wraparound_time; 126 }; 127 128 /* Per CPU container for runtime CPPC management. */ 129 struct cppc_cpudata { 130 struct list_head node; 131 struct cppc_perf_caps perf_caps; 132 struct cppc_perf_ctrls perf_ctrls; 133 struct cppc_perf_fb_ctrs perf_fb_ctrs; 134 unsigned int shared_type; 135 cpumask_var_t shared_cpu_map; 136 }; 137 138 #ifdef CONFIG_ACPI_CPPC_LIB 139 extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf); 140 extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf); 141 extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs); 142 extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); 143 extern int cppc_set_enable(int cpu, bool enable); 144 extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps); 145 extern bool cppc_perf_ctrs_in_pcc(void); 146 extern bool acpi_cpc_valid(void); 147 extern bool cppc_allow_fast_switch(void); 148 extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data); 149 extern unsigned int cppc_get_transition_latency(int cpu); 150 extern bool cpc_ffh_supported(void); 151 extern bool cpc_supported_by_cpu(void); 152 extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val); 153 extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val); 154 extern int cppc_get_epp_perf(int cpunum, u64 *epp_perf); 155 extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable); 156 #else /* !CONFIG_ACPI_CPPC_LIB */ 157 static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf) 158 { 159 return -ENOTSUPP; 160 } 161 static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf) 162 { 163 return -ENOTSUPP; 164 } 165 static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs) 166 { 167 return -ENOTSUPP; 168 } 169 static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) 170 { 171 return -ENOTSUPP; 172 } 173 static inline int cppc_set_enable(int cpu, bool enable) 174 { 175 return -ENOTSUPP; 176 } 177 static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps) 178 { 179 return -ENOTSUPP; 180 } 181 static inline bool cppc_perf_ctrs_in_pcc(void) 182 { 183 return false; 184 } 185 static inline bool acpi_cpc_valid(void) 186 { 187 return false; 188 } 189 static inline bool cppc_allow_fast_switch(void) 190 { 191 return false; 192 } 193 static inline unsigned int cppc_get_transition_latency(int cpu) 194 { 195 return CPUFREQ_ETERNAL; 196 } 197 static inline bool cpc_ffh_supported(void) 198 { 199 return false; 200 } 201 static inline int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val) 202 { 203 return -ENOTSUPP; 204 } 205 static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val) 206 { 207 return -ENOTSUPP; 208 } 209 static inline int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable) 210 { 211 return -ENOTSUPP; 212 } 213 static inline int cppc_get_epp_perf(int cpunum, u64 *epp_perf) 214 { 215 return -ENOTSUPP; 216 } 217 #endif /* !CONFIG_ACPI_CPPC_LIB */ 218 219 #endif /* _CPPC_ACPI_H*/ 220