include/acpi/cppc_acpi.h

   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*/