linux/drivers/thermal/st/st_thermal_syscfg.c
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   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
  38static 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
  45static 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
  52static 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
  59static 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 */
  67static 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
  73static 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
  88static 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
 100static 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 */
 107const 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 */
 117const 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 */
 127const 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 */
 137const 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
 146static 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};
 153MODULE_DEVICE_TABLE(of, st_syscfg_thermal_of_match);
 154
 155int st_syscfg_probe(struct platform_device *pdev)
 156{
 157        return st_thermal_register(pdev, st_syscfg_thermal_of_match);
 158}
 159
 160int st_syscfg_remove(struct platform_device *pdev)
 161{
 162        return st_thermal_unregister(pdev);
 163}
 164
 165static 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};
 174module_platform_driver(st_syscfg_thermal_driver);
 175
 176MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
 177MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
 178MODULE_LICENSE("GPL v2");
 179
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