kernel/drivers/thermal/st/st_thermal_syscfg.c

   1 /*
   2  * ST Thermal Sensor Driver for syscfg based sensors.
   3  * Author: Ajit Pal Singh <ajitpal.singh@st.com>
   4  *
   5  * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/of.h>
  14 #include <linux/module.h>
  15 #include <linux/mfd/syscon.h>
  16
  17 #include "st_thermal.h"
  18
  19 /* STiH415 */
  20 #define STIH415_SYSCFG_FRONT(num)               ((num - 100) * 4)
  21 #define STIH415_SAS_THSENS_CONF                 STIH415_SYSCFG_FRONT(178)
  22 #define STIH415_SAS_THSENS_STATUS               STIH415_SYSCFG_FRONT(198)
  23 #define STIH415_SYSCFG_MPE(num)                 ((num - 600) * 4)
  24 #define STIH415_MPE_THSENS_CONF                 STIH415_SYSCFG_MPE(607)
  25 #define STIH415_MPE_THSENS_STATUS               STIH415_SYSCFG_MPE(667)
  26
  27 /* STiH416 */
  28 #define STIH416_SYSCFG_FRONT(num)               ((num - 1000) * 4)
  29 #define STIH416_SAS_THSENS_CONF                 STIH416_SYSCFG_FRONT(1552)
  30 #define STIH416_SAS_THSENS_STATUS1              STIH416_SYSCFG_FRONT(1554)
  31 #define STIH416_SAS_THSENS_STATUS2              STIH416_SYSCFG_FRONT(1594)
  32
  33 /* STiD127 */
  34 #define STID127_SYSCFG_CPU(num)                 ((num - 700) * 4)
  35 #define STID127_THSENS_CONF                     STID127_SYSCFG_CPU(743)
  36 #define STID127_THSENS_STATUS                   STID127_SYSCFG_CPU(767)
  37
  38 static const struct reg_field st_415sas_regfields[MAX_REGFIELDS] = {
  39         [TEMP_PWR] = REG_FIELD(STIH415_SAS_THSENS_CONF,   9,  9),
  40         [DCORRECT] = REG_FIELD(STIH415_SAS_THSENS_CONF,   4,  8),
  41         [OVERFLOW] = REG_FIELD(STIH415_SAS_THSENS_STATUS, 8,  8),
  42         [DATA]     = REG_FIELD(STIH415_SAS_THSENS_STATUS, 10, 16),
  43 };
  44
  45 static const struct reg_field st_415mpe_regfields[MAX_REGFIELDS] = {
  46         [TEMP_PWR] = REG_FIELD(STIH415_MPE_THSENS_CONF,   8,  8),
  47         [DCORRECT] = REG_FIELD(STIH415_MPE_THSENS_CONF,   3,  7),
  48         [OVERFLOW] = REG_FIELD(STIH415_MPE_THSENS_STATUS, 9,  9),
  49         [DATA]     = REG_FIELD(STIH415_MPE_THSENS_STATUS, 11, 18),
  50 };
  51
  52 static const struct reg_field st_416sas_regfields[MAX_REGFIELDS] = {
  53         [TEMP_PWR] = REG_FIELD(STIH416_SAS_THSENS_CONF,    9,  9),
  54         [DCORRECT] = REG_FIELD(STIH416_SAS_THSENS_CONF,    4,  8),
  55         [OVERFLOW] = REG_FIELD(STIH416_SAS_THSENS_STATUS1, 8,  8),
  56         [DATA]     = REG_FIELD(STIH416_SAS_THSENS_STATUS2, 10, 16),
  57 };
  58
  59 static const struct reg_field st_127_regfields[MAX_REGFIELDS] = {
  60         [TEMP_PWR] = REG_FIELD(STID127_THSENS_CONF,   7,  7),
  61         [DCORRECT] = REG_FIELD(STID127_THSENS_CONF,   2,  6),
  62         [OVERFLOW] = REG_FIELD(STID127_THSENS_STATUS, 9,  9),
  63         [DATA]     = REG_FIELD(STID127_THSENS_STATUS, 11, 18),
  64 };
  65
  66 /* Private OPs for System Configuration Register based thermal sensors */
  67 static int st_syscfg_power_ctrl(struct st_thermal_sensor *sensor,
  68                                 enum st_thermal_power_state power_state)
  69 {
  70         return regmap_field_write(sensor->pwr, power_state);
  71 }
  72
  73 static int st_syscfg_alloc_regfields(struct st_thermal_sensor *sensor)
  74 {
  75         struct device *dev = sensor->dev;
  76
  77         sensor->pwr = devm_regmap_field_alloc(dev, sensor->regmap,
  78                                         sensor->cdata->reg_fields[TEMP_PWR]);
  79
  80         if (IS_ERR(sensor->pwr)) {
  81                 dev_err(dev, "failed to alloc syscfg regfields\n");
  82                 return PTR_ERR(sensor->pwr);
  83         }
  84
  85         return 0;
  86 }
  87
  88 static int st_syscfg_regmap_init(struct st_thermal_sensor *sensor)
  89 {
  90         sensor->regmap =
  91                 syscon_regmap_lookup_by_compatible(sensor->cdata->sys_compat);
  92         if (IS_ERR(sensor->regmap)) {
  93                 dev_err(sensor->dev, "failed to find syscfg regmap\n");
  94                 return PTR_ERR(sensor->regmap);
  95         }
  96
  97         return 0;
  98 }
  99
 100 static const struct st_thermal_sensor_ops st_syscfg_sensor_ops = {
 101         .power_ctrl             = st_syscfg_power_ctrl,
 102         .alloc_regfields        = st_syscfg_alloc_regfields,
 103         .regmap_init            = st_syscfg_regmap_init,
 104 };
 105
 106 /* Compatible device data for stih415 sas thermal sensor */
 107 static const struct st_thermal_compat_data st_415sas_cdata = {
 108         .sys_compat             = "st,stih415-front-syscfg",
 109         .reg_fields             = st_415sas_regfields,
 110         .ops                    = &st_syscfg_sensor_ops,
 111         .calibration_val        = 16,
 112         .temp_adjust_val        = 20,
 113         .crit_temp              = 120,
 114 };
 115
 116 /* Compatible device data for stih415 mpe thermal sensor */
 117 static const struct st_thermal_compat_data st_415mpe_cdata = {
 118         .sys_compat             = "st,stih415-system-syscfg",
 119         .reg_fields             = st_415mpe_regfields,
 120         .ops                    = &st_syscfg_sensor_ops,
 121         .calibration_val        = 16,
 122         .temp_adjust_val        = -103,
 123         .crit_temp              = 120,
 124 };
 125
 126 /* Compatible device data for stih416 sas thermal sensor */
 127 static const struct st_thermal_compat_data st_416sas_cdata = {
 128         .sys_compat             = "st,stih416-front-syscfg",
 129         .reg_fields             = st_416sas_regfields,
 130         .ops                    = &st_syscfg_sensor_ops,
 131         .calibration_val        = 16,
 132         .temp_adjust_val        = 20,
 133         .crit_temp              = 120,
 134 };
 135
 136 /* Compatible device data for stid127 thermal sensor */
 137 static const struct st_thermal_compat_data st_127_cdata = {
 138         .sys_compat             = "st,stid127-cpu-syscfg",
 139         .reg_fields             = st_127_regfields,
 140         .ops                    = &st_syscfg_sensor_ops,
 141         .calibration_val        = 8,
 142         .temp_adjust_val        = -103,
 143         .crit_temp              = 120,
 144 };
 145
 146 static const struct of_device_id st_syscfg_thermal_of_match[] = {
 147         { .compatible = "st,stih415-sas-thermal", .data = &st_415sas_cdata },
 148         { .compatible = "st,stih415-mpe-thermal", .data = &st_415mpe_cdata },
 149         { .compatible = "st,stih416-sas-thermal", .data = &st_416sas_cdata },
 150         { .compatible = "st,stid127-thermal",     .data = &st_127_cdata },
 151         { /* sentinel */ }
 152 };
 153 MODULE_DEVICE_TABLE(of, st_syscfg_thermal_of_match);
 154
 155 static int st_syscfg_probe(struct platform_device *pdev)
 156 {
 157         return st_thermal_register(pdev, st_syscfg_thermal_of_match);
 158 }
 159
 160 static int st_syscfg_remove(struct platform_device *pdev)
 161 {
 162         return st_thermal_unregister(pdev);
 163 }
 164
 165 static struct platform_driver st_syscfg_thermal_driver = {
 166         .driver = {
 167                 .name   = "st_syscfg_thermal",
 168                 .pm     = &st_thermal_pm_ops,
 169                 .of_match_table =  st_syscfg_thermal_of_match,
 170         },
 171         .probe          = st_syscfg_probe,
 172         .remove         = st_syscfg_remove,
 173 };
 174 module_platform_driver(st_syscfg_thermal_driver);
 175
 176 MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
 177 MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
 178 MODULE_LICENSE("GPL v2");