drivers/thermal/st/st_thermal_syscfg.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ST Thermal Sensor Driver for syscfg based sensors.
   4  * Author: Ajit Pal Singh <ajitpal.singh@st.com>
   5  *
   6  * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited
   7  */
   8
   9 #include <linux/of.h>
  10 #include <linux/module.h>
  11 #include <linux/mfd/syscon.h>
  12
  13 #include "st_thermal.h"
  14
  15 /* STiH415 */
  16 #define STIH415_SYSCFG_FRONT(num)               ((num - 100) * 4)
  17 #define STIH415_SAS_THSENS_CONF                 STIH415_SYSCFG_FRONT(178)
  18 #define STIH415_SAS_THSENS_STATUS               STIH415_SYSCFG_FRONT(198)
  19 #define STIH415_SYSCFG_MPE(num)                 ((num - 600) * 4)
  20 #define STIH415_MPE_THSENS_CONF                 STIH415_SYSCFG_MPE(607)
  21 #define STIH415_MPE_THSENS_STATUS               STIH415_SYSCFG_MPE(667)
  22
  23 /* STiH416 */
  24 #define STIH416_SYSCFG_FRONT(num)               ((num - 1000) * 4)
  25 #define STIH416_SAS_THSENS_CONF                 STIH416_SYSCFG_FRONT(1552)
  26 #define STIH416_SAS_THSENS_STATUS1              STIH416_SYSCFG_FRONT(1554)
  27 #define STIH416_SAS_THSENS_STATUS2              STIH416_SYSCFG_FRONT(1594)
  28
  29 /* STiD127 */
  30 #define STID127_SYSCFG_CPU(num)                 ((num - 700) * 4)
  31 #define STID127_THSENS_CONF                     STID127_SYSCFG_CPU(743)
  32 #define STID127_THSENS_STATUS                   STID127_SYSCFG_CPU(767)
  33
  34 static const struct reg_field st_415sas_regfields[MAX_REGFIELDS] = {
  35         [TEMP_PWR] = REG_FIELD(STIH415_SAS_THSENS_CONF,   9,  9),
  36         [DCORRECT] = REG_FIELD(STIH415_SAS_THSENS_CONF,   4,  8),
  37         [OVERFLOW] = REG_FIELD(STIH415_SAS_THSENS_STATUS, 8,  8),
  38         [DATA]     = REG_FIELD(STIH415_SAS_THSENS_STATUS, 10, 16),
  39 };
  40
  41 static const struct reg_field st_415mpe_regfields[MAX_REGFIELDS] = {
  42         [TEMP_PWR] = REG_FIELD(STIH415_MPE_THSENS_CONF,   8,  8),
  43         [DCORRECT] = REG_FIELD(STIH415_MPE_THSENS_CONF,   3,  7),
  44         [OVERFLOW] = REG_FIELD(STIH415_MPE_THSENS_STATUS, 9,  9),
  45         [DATA]     = REG_FIELD(STIH415_MPE_THSENS_STATUS, 11, 18),
  46 };
  47
  48 static const struct reg_field st_416sas_regfields[MAX_REGFIELDS] = {
  49         [TEMP_PWR] = REG_FIELD(STIH416_SAS_THSENS_CONF,    9,  9),
  50         [DCORRECT] = REG_FIELD(STIH416_SAS_THSENS_CONF,    4,  8),
  51         [OVERFLOW] = REG_FIELD(STIH416_SAS_THSENS_STATUS1, 8,  8),
  52         [DATA]     = REG_FIELD(STIH416_SAS_THSENS_STATUS2, 10, 16),
  53 };
  54
  55 static const struct reg_field st_127_regfields[MAX_REGFIELDS] = {
  56         [TEMP_PWR] = REG_FIELD(STID127_THSENS_CONF,   7,  7),
  57         [DCORRECT] = REG_FIELD(STID127_THSENS_CONF,   2,  6),
  58         [OVERFLOW] = REG_FIELD(STID127_THSENS_STATUS, 9,  9),
  59         [DATA]     = REG_FIELD(STID127_THSENS_STATUS, 11, 18),
  60 };
  61
  62 /* Private OPs for System Configuration Register based thermal sensors */
  63 static int st_syscfg_power_ctrl(struct st_thermal_sensor *sensor,
  64                                 enum st_thermal_power_state power_state)
  65 {
  66         return regmap_field_write(sensor->pwr, power_state);
  67 }
  68
  69 static int st_syscfg_alloc_regfields(struct st_thermal_sensor *sensor)
  70 {
  71         struct device *dev = sensor->dev;
  72
  73         sensor->pwr = devm_regmap_field_alloc(dev, sensor->regmap,
  74                                         sensor->cdata->reg_fields[TEMP_PWR]);
  75
  76         if (IS_ERR(sensor->pwr)) {
  77                 dev_err(dev, "failed to alloc syscfg regfields\n");
  78                 return PTR_ERR(sensor->pwr);
  79         }
  80
  81         return 0;
  82 }
  83
  84 static int st_syscfg_regmap_init(struct st_thermal_sensor *sensor)
  85 {
  86         sensor->regmap =
  87                 syscon_regmap_lookup_by_compatible(sensor->cdata->sys_compat);
  88         if (IS_ERR(sensor->regmap)) {
  89                 dev_err(sensor->dev, "failed to find syscfg regmap\n");
  90                 return PTR_ERR(sensor->regmap);
  91         }
  92
  93         return 0;
  94 }
  95
  96 static const struct st_thermal_sensor_ops st_syscfg_sensor_ops = {
  97         .power_ctrl             = st_syscfg_power_ctrl,
  98         .alloc_regfields        = st_syscfg_alloc_regfields,
  99         .regmap_init            = st_syscfg_regmap_init,
 100 };
 101
 102 /* Compatible device data for stih415 sas thermal sensor */
 103 static const struct st_thermal_compat_data st_415sas_cdata = {
 104         .sys_compat             = "st,stih415-front-syscfg",
 105         .reg_fields             = st_415sas_regfields,
 106         .ops                    = &st_syscfg_sensor_ops,
 107         .calibration_val        = 16,
 108         .temp_adjust_val        = 20,
 109         .crit_temp              = 120,
 110 };
 111
 112 /* Compatible device data for stih415 mpe thermal sensor */
 113 static const struct st_thermal_compat_data st_415mpe_cdata = {
 114         .sys_compat             = "st,stih415-system-syscfg",
 115         .reg_fields             = st_415mpe_regfields,
 116         .ops                    = &st_syscfg_sensor_ops,
 117         .calibration_val        = 16,
 118         .temp_adjust_val        = -103,
 119         .crit_temp              = 120,
 120 };
 121
 122 /* Compatible device data for stih416 sas thermal sensor */
 123 static const struct st_thermal_compat_data st_416sas_cdata = {
 124         .sys_compat             = "st,stih416-front-syscfg",
 125         .reg_fields             = st_416sas_regfields,
 126         .ops                    = &st_syscfg_sensor_ops,
 127         .calibration_val        = 16,
 128         .temp_adjust_val        = 20,
 129         .crit_temp              = 120,
 130 };
 131
 132 /* Compatible device data for stid127 thermal sensor */
 133 static const struct st_thermal_compat_data st_127_cdata = {
 134         .sys_compat             = "st,stid127-cpu-syscfg",
 135         .reg_fields             = st_127_regfields,
 136         .ops                    = &st_syscfg_sensor_ops,
 137         .calibration_val        = 8,
 138         .temp_adjust_val        = -103,
 139         .crit_temp              = 120,
 140 };
 141
 142 static const struct of_device_id st_syscfg_thermal_of_match[] = {
 143         { .compatible = "st,stih415-sas-thermal", .data = &st_415sas_cdata },
 144         { .compatible = "st,stih415-mpe-thermal", .data = &st_415mpe_cdata },
 145         { .compatible = "st,stih416-sas-thermal", .data = &st_416sas_cdata },
 146         { .compatible = "st,stid127-thermal",     .data = &st_127_cdata },
 147         { /* sentinel */ }
 148 };
 149 MODULE_DEVICE_TABLE(of, st_syscfg_thermal_of_match);
 150
 151 static int st_syscfg_probe(struct platform_device *pdev)
 152 {
 153         return st_thermal_register(pdev, st_syscfg_thermal_of_match);
 154 }
 155
 156 static int st_syscfg_remove(struct platform_device *pdev)
 157 {
 158         return st_thermal_unregister(pdev);
 159 }
 160
 161 static struct platform_driver st_syscfg_thermal_driver = {
 162         .driver = {
 163                 .name   = "st_syscfg_thermal",
 164                 .pm     = &st_thermal_pm_ops,
 165                 .of_match_table =  st_syscfg_thermal_of_match,
 166         },
 167         .probe          = st_syscfg_probe,
 168         .remove         = st_syscfg_remove,
 169 };
 170 module_platform_driver(st_syscfg_thermal_driver);
 171
 172 MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
 173 MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
 174 MODULE_LICENSE("GPL v2");