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/mailbox_controller.h> 19 #include <linux/mailbox_client.h> 20 #include <linux/types.h> 21 22 #include <acpi/processor.h> 23 24 /* Only support CPPCv2 for now. */ 25 #define CPPC_NUM_ENT 21 26 #define CPPC_REV 2 27 28 #define PCC_CMD_COMPLETE 1 29 #define MAX_CPC_REG_ENT 19 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 __iomem 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 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 struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT]; 65 struct acpi_psd_package domain_info; 66 }; 67 68 /* These are indexes into the per-cpu cpc_regs[]. Order is important. */ 69 enum cppc_regs { 70 HIGHEST_PERF, 71 NOMINAL_PERF, 72 LOW_NON_LINEAR_PERF, 73 LOWEST_PERF, 74 GUARANTEED_PERF, 75 DESIRED_PERF, 76 MIN_PERF, 77 MAX_PERF, 78 PERF_REDUC_TOLERANCE, 79 TIME_WINDOW, 80 CTR_WRAP_TIME, 81 REFERENCE_CTR, 82 DELIVERED_CTR, 83 PERF_LIMITED, 84 ENABLE, 85 AUTO_SEL_ENABLE, 86 AUTO_ACT_WINDOW, 87 ENERGY_PERF, 88 REFERENCE_PERF, 89 }; 90 91 /* 92 * Categorization of registers as described 93 * in the ACPI v.5.1 spec. 94 * XXX: Only filling up ones which are used by governors 95 * today. 96 */ 97 struct cppc_perf_caps { 98 u32 highest_perf; 99 u32 nominal_perf; 100 u32 reference_perf; 101 u32 lowest_perf; 102 }; 103 104 struct cppc_perf_ctrls { 105 u32 max_perf; 106 u32 min_perf; 107 u32 desired_perf; 108 }; 109 110 struct cppc_perf_fb_ctrs { 111 u64 reference; 112 u64 prev_reference; 113 u64 delivered; 114 u64 prev_delivered; 115 }; 116 117 /* Per CPU container for runtime CPPC management. */ 118 struct cpudata { 119 int cpu; 120 struct cppc_perf_caps perf_caps; 121 struct cppc_perf_ctrls perf_ctrls; 122 struct cppc_perf_fb_ctrs perf_fb_ctrs; 123 struct cpufreq_policy *cur_policy; 124 unsigned int shared_type; 125 cpumask_var_t shared_cpu_map; 126 }; 127 128 extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs); 129 extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); 130 extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps); 131 extern int acpi_get_psd_map(struct cpudata **); 132 133 /* Methods to interact with the PCC mailbox controller. */ 134 extern struct mbox_chan * 135 pcc_mbox_request_channel(struct mbox_client *, unsigned int); 136 137 #endif /* _CPPC_ACPI_H*/ 138