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 1
  28 #define MAX_CPC_REG_ENT 19
  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         union {
  53                 struct cpc_reg reg;
  54                 u64 int_value;
  55         } cpc_entry;
  56 };
  57
  58 /* Container to hold the CPC details for each CPU */
  59 struct cpc_desc {
  60         int num_entries;
  61         int version;
  62         int cpu_id;
  63         struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT];
  64         struct acpi_psd_package domain_info;
  65 };
  66
  67 /* These are indexes into the per-cpu cpc_regs[]. Order is important. */
  68 enum cppc_regs {
  69         HIGHEST_PERF,
  70         NOMINAL_PERF,
  71         LOW_NON_LINEAR_PERF,
  72         LOWEST_PERF,
  73         GUARANTEED_PERF,
  74         DESIRED_PERF,
  75         MIN_PERF,
  76         MAX_PERF,
  77         PERF_REDUC_TOLERANCE,
  78         TIME_WINDOW,
  79         CTR_WRAP_TIME,
  80         REFERENCE_CTR,
  81         DELIVERED_CTR,
  82         PERF_LIMITED,
  83         ENABLE,
  84         AUTO_SEL_ENABLE,
  85         AUTO_ACT_WINDOW,
  86         ENERGY_PERF,
  87         REFERENCE_PERF,
  88 };
  89
  90 /*
  91  * Categorization of registers as described
  92  * in the ACPI v.5.1 spec.
  93  * XXX: Only filling up ones which are used by governors
  94  * today.
  95  */
  96 struct cppc_perf_caps {
  97         u32 highest_perf;
  98         u32 nominal_perf;
  99         u32 reference_perf;
 100         u32 lowest_perf;
 101 };
 102
 103 struct cppc_perf_ctrls {
 104         u32 max_perf;
 105         u32 min_perf;
 106         u32 desired_perf;
 107 };
 108
 109 struct cppc_perf_fb_ctrs {
 110         u64 reference;
 111         u64 prev_reference;
 112         u64 delivered;
 113         u64 prev_delivered;
 114 };
 115
 116 /* Per CPU container for runtime CPPC management. */
 117 struct cpudata {
 118         int cpu;
 119         struct cppc_perf_caps perf_caps;
 120         struct cppc_perf_ctrls perf_ctrls;
 121         struct cppc_perf_fb_ctrs perf_fb_ctrs;
 122         struct cpufreq_policy *cur_policy;
 123         unsigned int shared_type;
 124         cpumask_var_t shared_cpu_map;
 125 };
 126
 127 extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
 128 extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
 129 extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
 130 extern int acpi_get_psd_map(struct cpudata **);
 131
 132 #endif /* _CPPC_ACPI_H*/