1 /* 2 * CPPC (Collaborative Processor Performance Control) methods used 3 * by CPUfreq drivers. 4 * 5 * (C) Copyright 2014, 2015 Linaro Ltd. 6 * Author: Ashwin Chaugule <ashwin.chaugule@linaro.org> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; version 2 11 * of the License. 12 */ 13 14 #ifndef _CPPC_ACPI_H 15 #define _CPPC_ACPI_H 16 17 #include <linux/acpi.h> 18 #include <linux/types.h> 19 20 #include <acpi/pcc.h> 21 #include <acpi/processor.h> 22 23 /* Support CPPCv2 and CPPCv3 */ 24 #define CPPC_V2_REV 2 25 #define CPPC_V3_REV 3 26 #define CPPC_V2_NUM_ENT 21 27 #define CPPC_V3_NUM_ENT 23 28 29 #define PCC_CMD_COMPLETE_MASK (1 << 0) 30 #define PCC_ERROR_MASK (1 << 2) 31 32 #define MAX_CPC_REG_ENT 21 33 34 /* CPPC specific PCC commands. */ 35 #define CMD_READ 0 36 #define CMD_WRITE 1 37 38 /* Each register has the folowing format. */ 39 struct cpc_reg { 40 u8 descriptor; 41 u16 length; 42 u8 space_id; 43 u8 bit_width; 44 u8 bit_offset; 45 u8 access_width; 46 u64 __iomem address; 47 } __packed; 48 49 /* 50 * Each entry in the CPC table is either 51 * of type ACPI_TYPE_BUFFER or 52 * ACPI_TYPE_INTEGER. 53 */ 54 struct cpc_register_resource { 55 acpi_object_type type; 56 u64 __iomem *sys_mem_vaddr; 57 union { 58 struct cpc_reg reg; 59 u64 int_value; 60 } cpc_entry; 61 }; 62 63 /* Container to hold the CPC details for each CPU */ 64 struct cpc_desc { 65 int num_entries; 66 int version; 67 int cpu_id; 68 int write_cmd_status; 69 int write_cmd_id; 70 struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT]; 71 struct acpi_psd_package domain_info; 72 struct kobject kobj; 73 }; 74 75 /* These are indexes into the per-cpu cpc_regs[]. Order is important. */ 76 enum cppc_regs { 77 HIGHEST_PERF, 78 NOMINAL_PERF, 79 LOW_NON_LINEAR_PERF, 80 LOWEST_PERF, 81 GUARANTEED_PERF, 82 DESIRED_PERF, 83 MIN_PERF, 84 MAX_PERF, 85 PERF_REDUC_TOLERANCE, 86 TIME_WINDOW, 87 CTR_WRAP_TIME, 88 REFERENCE_CTR, 89 DELIVERED_CTR, 90 PERF_LIMITED, 91 ENABLE, 92 AUTO_SEL_ENABLE, 93 AUTO_ACT_WINDOW, 94 ENERGY_PERF, 95 REFERENCE_PERF, 96 LOWEST_FREQ, 97 NOMINAL_FREQ, 98 }; 99 100 /* 101 * Categorization of registers as described 102 * in the ACPI v.5.1 spec. 103 * XXX: Only filling up ones which are used by governors 104 * today. 105 */ 106 struct cppc_perf_caps { 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 }; 114 115 struct cppc_perf_ctrls { 116 u32 max_perf; 117 u32 min_perf; 118 u32 desired_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 int cpu; 131 struct cppc_perf_caps perf_caps; 132 struct cppc_perf_ctrls perf_ctrls; 133 struct cppc_perf_fb_ctrs perf_fb_ctrs; 134 struct cpufreq_policy *cur_policy; 135 unsigned int shared_type; 136 cpumask_var_t shared_cpu_map; 137 }; 138 139 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_get_perf_caps(int cpu, struct cppc_perf_caps *caps); 142 extern int acpi_get_psd_map(struct cppc_cpudata **); 143 extern unsigned int cppc_get_transition_latency(int cpu); 144 145 #endif /* _CPPC_ACPI_H*/ 146