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 /* 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. */ 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 }; 112 113 struct cppc_perf_ctrls { 114 u32 max_perf; 115 u32 min_perf; 116 u32 desired_perf; 117 }; 118 119 struct 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. */ 127 struct 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 137 extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf); 138 extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf); 139 extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs); 140 extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); 141 extern int cppc_set_enable(int cpu, bool enable); 142 extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps); 143 extern bool acpi_cpc_valid(void); 144 extern bool cppc_allow_fast_switch(void); 145 extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data); 146 extern unsigned int cppc_get_transition_latency(int cpu); 147 extern bool cpc_ffh_supported(void); 148 extern bool cpc_supported_by_cpu(void); 149 extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val); 150 extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val); 151 #else /* !CONFIG_ACPI_CPPC_LIB */ 152 static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf) 153 { 154 return -ENOTSUPP; 155 } 156 static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf) 157 { 158 return -ENOTSUPP; 159 } 160 static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs) 161 { 162 return -ENOTSUPP; 163 } 164 static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) 165 { 166 return -ENOTSUPP; 167 } 168 static inline int cppc_set_enable(int cpu, bool enable) 169 { 170 return -ENOTSUPP; 171 } 172 static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps) 173 { 174 return -ENOTSUPP; 175 } 176 static inline bool acpi_cpc_valid(void) 177 { 178 return false; 179 } 180 static inline bool cppc_allow_fast_switch(void) 181 { 182 return false; 183 } 184 static inline unsigned int cppc_get_transition_latency(int cpu) 185 { 186 return CPUFREQ_ETERNAL; 187 } 188 static inline bool cpc_ffh_supported(void) 189 { 190 return false; 191 } 192 static inline int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val) 193 { 194 return -ENOTSUPP; 195 } 196 static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val) 197 { 198 return -ENOTSUPP; 199 } 200 #endif /* !CONFIG_ACPI_CPPC_LIB */ 201 202 #endif /* _CPPC_ACPI_H*/ 203