include/acpi/cppc_acpi.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * CPPC (Collaborative Processor Performance Control) methods used
   4  * by CPUfreq drivers.
   5  *
   6  * (C) Copyright 2014, 2015 Linaro Ltd.
   7  * Author: Ashwin Chaugule <ashwin.chaugule@linaro.org>
   8  */
   9
  10 #ifndef _CPPC_ACPI_H
  11 #define _CPPC_ACPI_H
  12
  13 #include <linux/acpi.h>
  14 #include <linux/types.h>
  15
  16 #include <acpi/pcc.h>
  17 #include <acpi/processor.h>
  18
  19 /* Support CPPCv2 and CPPCv3  */
  20 #define CPPC_V2_REV     2
  21 #define CPPC_V3_REV     3
  22 #define CPPC_V2_NUM_ENT 21
  23 #define CPPC_V3_NUM_ENT 23
  24
  25 #define PCC_CMD_COMPLETE_MASK   (1 << 0)
  26 #define PCC_ERROR_MASK          (1 << 2)
  27
  28 #define MAX_CPC_REG_ENT 21
  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         u64 __iomem *sys_mem_vaddr;
  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         int write_cmd_status;
  65         int write_cmd_id;
  66         struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT];
  67         struct acpi_psd_package domain_info;
  68         struct kobject kobj;
  69 };
  70
  71 /* These are indexes into the per-cpu cpc_regs[]. Order is important. */
  72 enum cppc_regs {
  73         HIGHEST_PERF,
  74         NOMINAL_PERF,
  75         LOW_NON_LINEAR_PERF,
  76         LOWEST_PERF,
  77         GUARANTEED_PERF,
  78         DESIRED_PERF,
  79         MIN_PERF,
  80         MAX_PERF,
  81         PERF_REDUC_TOLERANCE,
  82         TIME_WINDOW,
  83         CTR_WRAP_TIME,
  84         REFERENCE_CTR,
  85         DELIVERED_CTR,
  86         PERF_LIMITED,
  87         ENABLE,
  88         AUTO_SEL_ENABLE,
  89         AUTO_ACT_WINDOW,
  90         ENERGY_PERF,
  91         REFERENCE_PERF,
  92         LOWEST_FREQ,
  93         NOMINAL_FREQ,
  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 guaranteed_perf;
 104         u32 highest_perf;
 105         u32 nominal_perf;
 106         u32 lowest_perf;
 107         u32 lowest_nonlinear_perf;
 108         u32 lowest_freq;
 109         u32 nominal_freq;
 110 };
 111
 112 struct cppc_perf_ctrls {
 113         u32 max_perf;
 114         u32 min_perf;
 115         u32 desired_perf;
 116 };
 117
 118 struct cppc_perf_fb_ctrs {
 119         u64 reference;
 120         u64 delivered;
 121         u64 reference_perf;
 122         u64 wraparound_time;
 123 };
 124
 125 /* Per CPU container for runtime CPPC management. */
 126 struct cppc_cpudata {
 127         int cpu;
 128         struct cppc_perf_caps perf_caps;
 129         struct cppc_perf_ctrls perf_ctrls;
 130         struct cppc_perf_fb_ctrs perf_fb_ctrs;
 131         struct cpufreq_policy *cur_policy;
 132         unsigned int shared_type;
 133         cpumask_var_t shared_cpu_map;
 134 };
 135
 136 extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);
 137 extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
 138 extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
 139 extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
 140 extern int acpi_get_psd_map(struct cppc_cpudata **);
 141 extern unsigned int cppc_get_transition_latency(int cpu);
 142 extern bool cpc_ffh_supported(void);
 143 extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
 144 extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
 145
 146 #endif /* _CPPC_ACPI_H*/