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 */ 107static 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 */ 117static 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 */ 127static 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 */ 137static 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 146static 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}; 153MODULE_DEVICE_TABLE(of, st_syscfg_thermal_of_match); 154 155static int st_syscfg_probe(struct platform_device *pdev) 156{ 157 return st_thermal_register(pdev, st_syscfg_thermal_of_match); 158} 159 160static int 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