1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * ST Thermal Sensor Driver for memory mapped 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 12 #include "st_thermal.h" 13 14 #define STIH416_MPE_CONF 0x0 15 #define STIH416_MPE_STATUS 0x4 16 #define STIH416_MPE_INT_THRESH 0x8 17 #define STIH416_MPE_INT_EN 0xC 18 19 /* Power control bits for the memory mapped thermal sensor */ 20 #define THERMAL_PDN BIT(4) 21 #define THERMAL_SRSTN BIT(10) 22 23 static const struct reg_field st_mmap_thermal_regfields[MAX_REGFIELDS] = { 24 /* 25 * According to the STIH416 MPE temp sensor data sheet - 26 * the PDN (Power Down Bit) and SRSTN (Soft Reset Bit) need to be 27 * written simultaneously for powering on and off the temperature 28 * sensor. regmap_update_bits() will be used to update the register. 29 */ 30 [INT_THRESH_HI] = REG_FIELD(STIH416_MPE_INT_THRESH, 0, 7), 31 [DCORRECT] = REG_FIELD(STIH416_MPE_CONF, 5, 9), 32 [OVERFLOW] = REG_FIELD(STIH416_MPE_STATUS, 9, 9), 33 [DATA] = REG_FIELD(STIH416_MPE_STATUS, 11, 18), 34 [INT_ENABLE] = REG_FIELD(STIH416_MPE_INT_EN, 0, 0), 35 }; 36 37 static irqreturn_t st_mmap_thermal_trip_handler(int irq, void *sdata) 38 { 39 struct st_thermal_sensor *sensor = sdata; 40 41 thermal_zone_device_update(sensor->thermal_dev, 42 THERMAL_EVENT_UNSPECIFIED); 43 44 return IRQ_HANDLED; 45 } 46 47 /* Private ops for the Memory Mapped based thermal sensors */ 48 static int st_mmap_power_ctrl(struct st_thermal_sensor *sensor, 49 enum st_thermal_power_state power_state) 50 { 51 const unsigned int mask = (THERMAL_PDN | THERMAL_SRSTN); 52 const unsigned int val = power_state ? mask : 0; 53 54 return regmap_update_bits(sensor->regmap, STIH416_MPE_CONF, mask, val); 55 } 56 57 static int st_mmap_alloc_regfields(struct st_thermal_sensor *sensor) 58 { 59 struct device *dev = sensor->dev; 60 struct regmap *regmap = sensor->regmap; 61 const struct reg_field *reg_fields = sensor->cdata->reg_fields; 62 63 sensor->int_thresh_hi = devm_regmap_field_alloc(dev, regmap, 64 reg_fields[INT_THRESH_HI]); 65 sensor->int_enable = devm_regmap_field_alloc(dev, regmap, 66 reg_fields[INT_ENABLE]); 67 68 if (IS_ERR(sensor->int_thresh_hi) || IS_ERR(sensor->int_enable)) { 69 dev_err(dev, "failed to alloc mmap regfields\n"); 70 return -EINVAL; 71 } 72 73 return 0; 74 } 75 76 static int st_mmap_enable_irq(struct st_thermal_sensor *sensor) 77 { 78 int ret; 79 80 /* Set upper critical threshold */ 81 ret = regmap_field_write(sensor->int_thresh_hi, 82 sensor->cdata->crit_temp - 83 sensor->cdata->temp_adjust_val); 84 if (ret) 85 return ret; 86 87 return regmap_field_write(sensor->int_enable, 1); 88 } 89 90 static int st_mmap_register_enable_irq(struct st_thermal_sensor *sensor) 91 { 92 struct device *dev = sensor->dev; 93 struct platform_device *pdev = to_platform_device(dev); 94 int ret; 95 96 sensor->irq = platform_get_irq(pdev, 0); 97 if (sensor->irq < 0) { 98 dev_err(dev, "failed to register IRQ\n"); 99 return sensor->irq; 100 } 101 102 ret = devm_request_threaded_irq(dev, sensor->irq, 103 NULL, st_mmap_thermal_trip_handler, 104 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 105 dev->driver->name, sensor); 106 if (ret) { 107 dev_err(dev, "failed to register IRQ %d\n", sensor->irq); 108 return ret; 109 } 110 111 return st_mmap_enable_irq(sensor); 112 } 113 114 static const struct regmap_config st_416mpe_regmap_config = { 115 .reg_bits = 32, 116 .val_bits = 32, 117 .reg_stride = 4, 118 }; 119 120 static int st_mmap_regmap_init(struct st_thermal_sensor *sensor) 121 { 122 struct device *dev = sensor->dev; 123 struct platform_device *pdev = to_platform_device(dev); 124 struct resource *res; 125 126 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 127 if (!res) { 128 dev_err(dev, "no memory resources defined\n"); 129 return -ENODEV; 130 } 131 132 sensor->mmio_base = devm_ioremap_resource(dev, res); 133 if (IS_ERR(sensor->mmio_base)) { 134 dev_err(dev, "failed to remap IO\n"); 135 return PTR_ERR(sensor->mmio_base); 136 } 137 138 sensor->regmap = devm_regmap_init_mmio(dev, sensor->mmio_base, 139 &st_416mpe_regmap_config); 140 if (IS_ERR(sensor->regmap)) { 141 dev_err(dev, "failed to initialise regmap\n"); 142 return PTR_ERR(sensor->regmap); 143 } 144 145 return 0; 146 } 147 148 static const struct st_thermal_sensor_ops st_mmap_sensor_ops = { 149 .power_ctrl = st_mmap_power_ctrl, 150 .alloc_regfields = st_mmap_alloc_regfields, 151 .regmap_init = st_mmap_regmap_init, 152 .register_enable_irq = st_mmap_register_enable_irq, 153 .enable_irq = st_mmap_enable_irq, 154 }; 155 156 /* Compatible device data stih416 mpe thermal sensor */ 157 static const struct st_thermal_compat_data st_416mpe_cdata = { 158 .reg_fields = st_mmap_thermal_regfields, 159 .ops = &st_mmap_sensor_ops, 160 .calibration_val = 14, 161 .temp_adjust_val = -95, 162 .crit_temp = 120, 163 }; 164 165 /* Compatible device data stih407 thermal sensor */ 166 static const struct st_thermal_compat_data st_407_cdata = { 167 .reg_fields = st_mmap_thermal_regfields, 168 .ops = &st_mmap_sensor_ops, 169 .calibration_val = 16, 170 .temp_adjust_val = -95, 171 .crit_temp = 120, 172 }; 173 174 static const struct of_device_id st_mmap_thermal_of_match[] = { 175 { .compatible = "st,stih416-mpe-thermal", .data = &st_416mpe_cdata }, 176 { .compatible = "st,stih407-thermal", .data = &st_407_cdata }, 177 { /* sentinel */ } 178 }; 179 MODULE_DEVICE_TABLE(of, st_mmap_thermal_of_match); 180 181 static int st_mmap_probe(struct platform_device *pdev) 182 { 183 return st_thermal_register(pdev, st_mmap_thermal_of_match); 184 } 185 186 static int st_mmap_remove(struct platform_device *pdev) 187 { 188 return st_thermal_unregister(pdev); 189 } 190 191 static struct platform_driver st_mmap_thermal_driver = { 192 .driver = { 193 .name = "st_thermal_mmap", 194 .pm = &st_thermal_pm_ops, 195 .of_match_table = st_mmap_thermal_of_match, 196 }, 197 .probe = st_mmap_probe, 198 .remove = st_mmap_remove, 199 }; 200 201 module_platform_driver(st_mmap_thermal_driver); 202 203 MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>"); 204 MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver"); 205 MODULE_LICENSE("GPL v2"); 206