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 /* Only support CPPCv2 for now. */ 24 #define CPPC_NUM_ENT 21 25 #define CPPC_REV 2 26 27 #define PCC_CMD_COMPLETE_MASK (1 << 0) 28 #define PCC_ERROR_MASK (1 << 2) 29 30 #define MAX_CPC_REG_ENT 19 31 32 /* CPPC specific PCC commands. */ 33 #define CMD_READ 0 34 #define CMD_WRITE 1 35 36 /* Each register has the folowing format. */ 37 struct cpc_reg { 38 u8 descriptor; 39 u16 length; 40 u8 space_id; 41 u8 bit_width; 42 u8 bit_offset; 43 u8 access_width; 44 u64 __iomem address; 45 } __packed; 46 47 /* 48 * Each entry in the CPC table is either 49 * of type ACPI_TYPE_BUFFER or 50 * ACPI_TYPE_INTEGER. 51 */ 52 struct cpc_register_resource { 53 acpi_object_type type; 54 u64 __iomem *sys_mem_vaddr; 55 union { 56 struct cpc_reg reg; 57 u64 int_value; 58 } cpc_entry; 59 }; 60 61 /* Container to hold the CPC details for each CPU */ 62 struct cpc_desc { 63 int num_entries; 64 int version; 65 int cpu_id; 66 int write_cmd_status; 67 int write_cmd_id; 68 struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT]; 69 struct acpi_psd_package domain_info; 70 struct kobject kobj; 71 }; 72 73 /* These are indexes into the per-cpu cpc_regs[]. Order is important. */ 74 enum cppc_regs { 75 HIGHEST_PERF, 76 NOMINAL_PERF, 77 LOW_NON_LINEAR_PERF, 78 LOWEST_PERF, 79 GUARANTEED_PERF, 80 DESIRED_PERF, 81 MIN_PERF, 82 MAX_PERF, 83 PERF_REDUC_TOLERANCE, 84 TIME_WINDOW, 85 CTR_WRAP_TIME, 86 REFERENCE_CTR, 87 DELIVERED_CTR, 88 PERF_LIMITED, 89 ENABLE, 90 AUTO_SEL_ENABLE, 91 AUTO_ACT_WINDOW, 92 ENERGY_PERF, 93 REFERENCE_PERF, 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 highest_perf; 104 u32 nominal_perf; 105 u32 lowest_perf; 106 }; 107 108 struct cppc_perf_ctrls { 109 u32 max_perf; 110 u32 min_perf; 111 u32 desired_perf; 112 }; 113 114 struct cppc_perf_fb_ctrs { 115 u64 reference; 116 u64 delivered; 117 u64 reference_perf; 118 u64 ctr_wrap_time; 119 }; 120 121 /* Per CPU container for runtime CPPC management. */ 122 struct cppc_cpudata { 123 int cpu; 124 struct cppc_perf_caps perf_caps; 125 struct cppc_perf_ctrls perf_ctrls; 126 struct cppc_perf_fb_ctrs perf_fb_ctrs; 127 struct cpufreq_policy *cur_policy; 128 unsigned int shared_type; 129 cpumask_var_t shared_cpu_map; 130 }; 131 132 extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs); 133 extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); 134 extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps); 135 extern int acpi_get_psd_map(struct cppc_cpudata **); 136 extern unsigned int cppc_get_transition_latency(int cpu); 137 138 #endif /* _CPPC_ACPI_H*/ 139