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/types.h> 15 16 #include <acpi/pcc.h> 17 #include <acpi/processor.h> 18 19 /* Support CPPCv2 and CPPCv3 */ 20 #define CPPC_V2_REV 2 21 #define CPPC_V3_REV 3 22 #define CPPC_V2_NUM_ENT 21 23 #define CPPC_V3_NUM_ENT 23 24 25 #define PCC_CMD_COMPLETE_MASK (1 << 0) 26 #define PCC_ERROR_MASK (1 << 2) 27 28 #define MAX_CPC_REG_ENT 21 29 30 /* CPPC specific PCC commands. */ 31 #define CMD_READ 0 32 #define CMD_WRITE 1 33 34 /* Each register has the folowing format. */ 35 struct cpc_reg { 36 u8 descriptor; 37 u16 length; 38 u8 space_id; 39 u8 bit_width; 40 u8 bit_offset; 41 u8 access_width; 42 u64 __iomem address; 43 } __packed; 44 45 /* 46 * Each entry in the CPC table is either 47 * of type ACPI_TYPE_BUFFER or 48 * ACPI_TYPE_INTEGER. 49 */ 50 struct cpc_register_resource { 51 acpi_object_type type; 52 u64 __iomem *sys_mem_vaddr; 53 union { 54 struct cpc_reg reg; 55 u64 int_value; 56 } cpc_entry; 57 }; 58 59 /* Container to hold the CPC details for each CPU */ 60 struct cpc_desc { 61 int num_entries; 62 int version; 63 int cpu_id; 64 int write_cmd_status; 65 int write_cmd_id; 66 struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT]; 67 struct acpi_psd_package domain_info; 68 struct kobject kobj; 69 }; 70 71 /* These are indexes into the per-cpu cpc_regs[]. Order is important. */ 72 enum cppc_regs { 73 HIGHEST_PERF, 74 NOMINAL_PERF, 75 LOW_NON_LINEAR_PERF, 76 LOWEST_PERF, 77 GUARANTEED_PERF, 78 DESIRED_PERF, 79 MIN_PERF, 80 MAX_PERF, 81 PERF_REDUC_TOLERANCE, 82 TIME_WINDOW, 83 CTR_WRAP_TIME, 84 REFERENCE_CTR, 85 DELIVERED_CTR, 86 PERF_LIMITED, 87 ENABLE, 88 AUTO_SEL_ENABLE, 89 AUTO_ACT_WINDOW, 90 ENERGY_PERF, 91 REFERENCE_PERF, 92 LOWEST_FREQ, 93 NOMINAL_FREQ, 94 }; 95 96 /* 97 * Categorization of registers as described 98 * in the ACPI v.5.1 spec. 99 * XXX: Only filling up ones which are used by governors 100 * today. 101 */ 102 struct cppc_perf_caps { 103 u32 guaranteed_perf; 104 u32 highest_perf; 105 u32 nominal_perf; 106 u32 lowest_perf; 107 u32 lowest_nonlinear_perf; 108 u32 lowest_freq; 109 u32 nominal_freq; 110 }; 111 112 struct cppc_perf_ctrls { 113 u32 max_perf; 114 u32 min_perf; 115 u32 desired_perf; 116 }; 117 118 struct cppc_perf_fb_ctrs { 119 u64 reference; 120 u64 delivered; 121 u64 reference_perf; 122 u64 wraparound_time; 123 }; 124 125 /* Per CPU container for runtime CPPC management. */ 126 struct cppc_cpudata { 127 int cpu; 128 struct cppc_perf_caps perf_caps; 129 struct cppc_perf_ctrls perf_ctrls; 130 struct cppc_perf_fb_ctrs perf_fb_ctrs; 131 struct cpufreq_policy *cur_policy; 132 unsigned int shared_type; 133 cpumask_var_t shared_cpu_map; 134 }; 135 136 extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf); 137 extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs); 138 extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); 139 extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps); 140 extern int acpi_get_psd_map(struct cppc_cpudata **); 141 extern unsigned int cppc_get_transition_latency(int cpu); 142 extern bool cpc_ffh_supported(void); 143 extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val); 144 extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val); 145 146 #endif /* _CPPC_ACPI_H*/ 147