thermal/st/st_thermal_syscfg.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * ST Thermal Sensor Driver for syscfg based sensors.
0004  * Author: Ajit Pal Singh <ajitpal.singh@st.com>
0005  *
0006  * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited
0007  */
0008
0009 #include <linux/of.h>
0010 #include <linux/module.h>
0011 #include <linux/mfd/syscon.h>
0012
0013 #include "st_thermal.h"
0014
0015 /* STiH415 */
0016 #define STIH415_SYSCFG_FRONT(num)       ((num - 100) * 4)
0017 #define STIH415_SAS_THSENS_CONF         STIH415_SYSCFG_FRONT(178)
0018 #define STIH415_SAS_THSENS_STATUS       STIH415_SYSCFG_FRONT(198)
0019 #define STIH415_SYSCFG_MPE(num)         ((num - 600) * 4)
0020 #define STIH415_MPE_THSENS_CONF         STIH415_SYSCFG_MPE(607)
0021 #define STIH415_MPE_THSENS_STATUS       STIH415_SYSCFG_MPE(667)
0022
0023 /* STiH416 */
0024 #define STIH416_SYSCFG_FRONT(num)       ((num - 1000) * 4)
0025 #define STIH416_SAS_THSENS_CONF         STIH416_SYSCFG_FRONT(1552)
0026 #define STIH416_SAS_THSENS_STATUS1      STIH416_SYSCFG_FRONT(1554)
0027 #define STIH416_SAS_THSENS_STATUS2      STIH416_SYSCFG_FRONT(1594)
0028
0029 /* STiD127 */
0030 #define STID127_SYSCFG_CPU(num)         ((num - 700) * 4)
0031 #define STID127_THSENS_CONF         STID127_SYSCFG_CPU(743)
0032 #define STID127_THSENS_STATUS           STID127_SYSCFG_CPU(767)
0033
0034 static const struct reg_field st_415sas_regfields[MAX_REGFIELDS] = {
0035     [TEMP_PWR] = REG_FIELD(STIH415_SAS_THSENS_CONF,   9,  9),
0036     [DCORRECT] = REG_FIELD(STIH415_SAS_THSENS_CONF,   4,  8),
0037     [OVERFLOW] = REG_FIELD(STIH415_SAS_THSENS_STATUS, 8,  8),
0038     [DATA]     = REG_FIELD(STIH415_SAS_THSENS_STATUS, 10, 16),
0039 };
0040
0041 static const struct reg_field st_415mpe_regfields[MAX_REGFIELDS] = {
0042     [TEMP_PWR] = REG_FIELD(STIH415_MPE_THSENS_CONF,   8,  8),
0043     [DCORRECT] = REG_FIELD(STIH415_MPE_THSENS_CONF,   3,  7),
0044     [OVERFLOW] = REG_FIELD(STIH415_MPE_THSENS_STATUS, 9,  9),
0045     [DATA]     = REG_FIELD(STIH415_MPE_THSENS_STATUS, 11, 18),
0046 };
0047
0048 static const struct reg_field st_416sas_regfields[MAX_REGFIELDS] = {
0049     [TEMP_PWR] = REG_FIELD(STIH416_SAS_THSENS_CONF,    9,  9),
0050     [DCORRECT] = REG_FIELD(STIH416_SAS_THSENS_CONF,    4,  8),
0051     [OVERFLOW] = REG_FIELD(STIH416_SAS_THSENS_STATUS1, 8,  8),
0052     [DATA]     = REG_FIELD(STIH416_SAS_THSENS_STATUS2, 10, 16),
0053 };
0054
0055 static const struct reg_field st_127_regfields[MAX_REGFIELDS] = {
0056     [TEMP_PWR] = REG_FIELD(STID127_THSENS_CONF,   7,  7),
0057     [DCORRECT] = REG_FIELD(STID127_THSENS_CONF,   2,  6),
0058     [OVERFLOW] = REG_FIELD(STID127_THSENS_STATUS, 9,  9),
0059     [DATA]     = REG_FIELD(STID127_THSENS_STATUS, 11, 18),
0060 };
0061
0062 /* Private OPs for System Configuration Register based thermal sensors */
0063 static int st_syscfg_power_ctrl(struct st_thermal_sensor *sensor,
0064                 enum st_thermal_power_state power_state)
0065 {
0066     return regmap_field_write(sensor->pwr, power_state);
0067 }
0068
0069 static int st_syscfg_alloc_regfields(struct st_thermal_sensor *sensor)
0070 {
0071     struct device *dev = sensor->dev;
0072
0073     sensor->pwr = devm_regmap_field_alloc(dev, sensor->regmap,
0074                     sensor->cdata->reg_fields[TEMP_PWR]);
0075
0076     if (IS_ERR(sensor->pwr)) {
0077         dev_err(dev, "failed to alloc syscfg regfields\n");
0078         return PTR_ERR(sensor->pwr);
0079     }
0080
0081     return 0;
0082 }
0083
0084 static int st_syscfg_regmap_init(struct st_thermal_sensor *sensor)
0085 {
0086     sensor->regmap =
0087         syscon_regmap_lookup_by_compatible(sensor->cdata->sys_compat);
0088     if (IS_ERR(sensor->regmap)) {
0089         dev_err(sensor->dev, "failed to find syscfg regmap\n");
0090         return PTR_ERR(sensor->regmap);
0091     }
0092
0093     return 0;
0094 }
0095
0096 static const struct st_thermal_sensor_ops st_syscfg_sensor_ops = {
0097     .power_ctrl     = st_syscfg_power_ctrl,
0098     .alloc_regfields    = st_syscfg_alloc_regfields,
0099     .regmap_init        = st_syscfg_regmap_init,
0100 };
0101
0102 /* Compatible device data for stih415 sas thermal sensor */
0103 static const struct st_thermal_compat_data st_415sas_cdata = {
0104     .sys_compat     = "st,stih415-front-syscfg",
0105     .reg_fields     = st_415sas_regfields,
0106     .ops            = &st_syscfg_sensor_ops,
0107     .calibration_val    = 16,
0108     .temp_adjust_val    = 20,
0109     .crit_temp      = 120,
0110 };
0111
0112 /* Compatible device data for stih415 mpe thermal sensor */
0113 static const struct st_thermal_compat_data st_415mpe_cdata = {
0114     .sys_compat     = "st,stih415-system-syscfg",
0115     .reg_fields     = st_415mpe_regfields,
0116     .ops            = &st_syscfg_sensor_ops,
0117     .calibration_val    = 16,
0118     .temp_adjust_val    = -103,
0119     .crit_temp      = 120,
0120 };
0121
0122 /* Compatible device data for stih416 sas thermal sensor */
0123 static const struct st_thermal_compat_data st_416sas_cdata = {
0124     .sys_compat     = "st,stih416-front-syscfg",
0125     .reg_fields     = st_416sas_regfields,
0126     .ops            = &st_syscfg_sensor_ops,
0127     .calibration_val    = 16,
0128     .temp_adjust_val    = 20,
0129     .crit_temp      = 120,
0130 };
0131
0132 /* Compatible device data for stid127 thermal sensor */
0133 static const struct st_thermal_compat_data st_127_cdata = {
0134     .sys_compat     = "st,stid127-cpu-syscfg",
0135     .reg_fields     = st_127_regfields,
0136     .ops            = &st_syscfg_sensor_ops,
0137     .calibration_val    = 8,
0138     .temp_adjust_val    = -103,
0139     .crit_temp      = 120,
0140 };
0141
0142 static const struct of_device_id st_syscfg_thermal_of_match[] = {
0143     { .compatible = "st,stih415-sas-thermal", .data = &st_415sas_cdata },
0144     { .compatible = "st,stih415-mpe-thermal", .data = &st_415mpe_cdata },
0145     { .compatible = "st,stih416-sas-thermal", .data = &st_416sas_cdata },
0146     { .compatible = "st,stid127-thermal",     .data = &st_127_cdata },
0147     { /* sentinel */ }
0148 };
0149 MODULE_DEVICE_TABLE(of, st_syscfg_thermal_of_match);
0150
0151 static int st_syscfg_probe(struct platform_device *pdev)
0152 {
0153     return st_thermal_register(pdev, st_syscfg_thermal_of_match);
0154 }
0155
0156 static int st_syscfg_remove(struct platform_device *pdev)
0157 {
0158     return st_thermal_unregister(pdev);
0159 }
0160
0161 static struct platform_driver st_syscfg_thermal_driver = {
0162     .driver = {
0163         .name   = "st_syscfg_thermal",
0164         .pm     = &st_thermal_pm_ops,
0165         .of_match_table =  st_syscfg_thermal_of_match,
0166     },
0167     .probe      = st_syscfg_probe,
0168     .remove     = st_syscfg_remove,
0169 };
0170 module_platform_driver(st_syscfg_thermal_driver);
0171
0172 MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
0173 MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
0174 MODULE_LICENSE("GPL v2");