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 /* 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 guaranteed_perf;
 108         u32 highest_perf;
 109         u32 nominal_perf;
 110         u32 lowest_perf;
 111         u32 lowest_nonlinear_perf;
 112         u32 lowest_freq;
 113         u32 nominal_freq;
 114 };
 115
 116 struct cppc_perf_ctrls {
 117         u32 max_perf;
 118         u32 min_perf;
 119         u32 desired_perf;
 120 };
 121
 122 struct cppc_perf_fb_ctrs {
 123         u64 reference;
 124         u64 delivered;
 125         u64 reference_perf;
 126         u64 wraparound_time;
 127 };
 128
 129 /* Per CPU container for runtime CPPC management. */
 130 struct cppc_cpudata {
 131         int cpu;
 132         struct cppc_perf_caps perf_caps;
 133         struct cppc_perf_ctrls perf_ctrls;
 134         struct cppc_perf_fb_ctrs perf_fb_ctrs;
 135         struct cpufreq_policy *cur_policy;
 136         unsigned int shared_type;
 137         cpumask_var_t shared_cpu_map;
 138 };
 139
 140 extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
 141 extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
 142 extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
 143 extern int acpi_get_psd_map(struct cppc_cpudata **);
 144 extern unsigned int cppc_get_transition_latency(int cpu);
 145
 146 #endif /* _CPPC_ACPI_H*/