/* * ST Thermal Sensor Driver for memory mapped sensors. * Author: Ajit Pal Singh * * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include #include #include "st_thermal.h" #define STIH416_MPE_CONF 0x0 #define STIH416_MPE_STATUS 0x4 #define STIH416_MPE_INT_THRESH 0x8 #define STIH416_MPE_INT_EN 0xC /* Power control bits for the memory mapped thermal sensor */ #define THERMAL_PDN BIT(4) #define THERMAL_SRSTN BIT(10) static const struct reg_field st_mmap_thermal_regfields[MAX_REGFIELDS] = { /* * According to the STIH416 MPE temp sensor data sheet - * the PDN (Power Down Bit) and SRSTN (Soft Reset Bit) need to be * written simultaneously for powering on and off the temperature * sensor. regmap_update_bits() will be used to update the register. */ [INT_THRESH_HI] = REG_FIELD(STIH416_MPE_INT_THRESH, 0, 7), [DCORRECT] = REG_FIELD(STIH416_MPE_CONF, 5, 9), [OVERFLOW] = REG_FIELD(STIH416_MPE_STATUS, 9, 9), [DATA] = REG_FIELD(STIH416_MPE_STATUS, 11, 18), [INT_ENABLE] = REG_FIELD(STIH416_MPE_INT_EN, 0, 0), }; static irqreturn_t st_mmap_thermal_trip_handler(int irq, void *sdata) { struct st_thermal_sensor *sensor = sdata; thermal_zone_device_update(sensor->thermal_dev); return IRQ_HANDLED; } /* Private ops for the Memory Mapped based thermal sensors */ static int st_mmap_power_ctrl(struct st_thermal_sensor *sensor, enum st_thermal_power_state power_state) { const unsigned int mask = (THERMAL_PDN | THERMAL_SRSTN); const unsigned int val = power_state ? mask : 0; return regmap_update_bits(sensor->regmap, STIH416_MPE_CONF, mask, val); } static int st_mmap_alloc_regfields(struct st_thermal_sensor *sensor) { struct device *dev = sensor->dev; struct regmap *regmap = sensor->regmap; const struct reg_field *reg_fields = sensor->cdata->reg_fields; sensor->int_thresh_hi = devm_regmap_field_alloc(dev, regmap, reg_fields[INT_THRESH_HI]); sensor->int_enable = devm_regmap_field_alloc(dev, regmap, reg_fields[INT_ENABLE]); if (IS_ERR(sensor->int_thresh_hi) || IS_ERR(sensor->int_enable)) { dev_err(dev, "failed to alloc mmap regfields\n"); return -EINVAL; } return 0; } static int st_mmap_enable_irq(struct st_thermal_sensor *sensor) { int ret; /* Set upper critical threshold */ ret = regmap_field_write(sensor->int_thresh_hi, sensor->cdata->crit_temp - sensor->cdata->temp_adjust_val); if (ret) return ret; return regmap_field_write(sensor->int_enable, 1); } static int st_mmap_register_enable_irq(struct st_thermal_sensor *sensor) { struct device *dev = sensor->dev; struct platform_device *pdev = to_platform_device(dev); int ret; sensor->irq = platform_get_irq(pdev, 0); if (sensor->irq < 0) { dev_err(dev, "failed to register IRQ\n"); return sensor->irq; } ret = devm_request_threaded_irq(dev, sensor->irq, NULL, st_mmap_thermal_trip_handler, IRQF_TRIGGER_RISING | IRQF_ONESHOT, dev->driver->name, sensor); if (ret) { dev_err(dev, "failed to register IRQ %d\n", sensor->irq); return ret; } return st_mmap_enable_irq(sensor); } static const struct regmap_config st_416mpe_regmap_config = { .reg_bits = 32, .val_bits = 32, .reg_stride = 4, }; static int st_mmap_regmap_init(struct st_thermal_sensor *sensor) { struct device *dev = sensor->dev; struct platform_device *pdev = to_platform_device(dev); struct resource *res; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(dev, "no memory resources defined\n"); return -ENODEV; } sensor->mmio_base = devm_ioremap_resource(dev, res); if (IS_ERR(sensor->mmio_base)) { dev_err(dev, "failed to remap IO\n"); return PTR_ERR(sensor->mmio_base); } sensor->regmap = devm_regmap_init_mmio(dev, sensor->mmio_base, &st_416mpe_regmap_config); if (IS_ERR(sensor->regmap)) { dev_err(dev, "failed to initialise regmap\n"); return PTR_ERR(sensor->regmap); } return 0; } static const struct st_thermal_sensor_ops st_mmap_sensor_ops = { .power_ctrl = st_mmap_power_ctrl, .alloc_regfields = st_mmap_alloc_regfields, .regmap_init = st_mmap_regmap_init, .register_enable_irq = st_mmap_register_enable_irq, .enable_irq = st_mmap_enable_irq, }; /* Compatible device data stih416 mpe thermal sensor */ const struct st_thermal_compat_data st_416mpe_cdata = { .reg_fields = st_mmap_thermal_regfields, .ops = &st_mmap_sensor_ops, .calibration_val = 14, .temp_adjust_val = -95, .crit_temp = 120, }; /* Compatible device data stih407 thermal sensor */ const struct st_thermal_compat_data st_407_cdata = { .reg_fields = st_mmap_thermal_regfields, .ops = &st_mmap_sensor_ops, .calibration_val = 16, .temp_adjust_val = -95, .crit_temp = 120, }; static const struct of_device_id st_mmap_thermal_of_match[] = { { .compatible = "st,stih416-mpe-thermal", .data = &st_416mpe_cdata }, { .compatible = "st,stih407-thermal", .data = &st_407_cdata }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, st_mmap_thermal_of_match); int st_mmap_probe(struct platform_device *pdev) { return st_thermal_register(pdev, st_mmap_thermal_of_match); } int st_mmap_remove(struct platform_device *pdev) { return st_thermal_unregister(pdev); } static struct platform_driver st_mmap_thermal_driver = { .driver = { .name = "st_thermal_mmap", .pm = &st_thermal_pm_ops, .of_match_table = st_mmap_thermal_of_match, }, .probe = st_mmap_probe, .remove = st_mmap_remove, }; module_platform_driver(st_mmap_thermal_driver); MODULE_AUTHOR("STMicroelectronics (R&D) Limited "); MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver"); MODULE_LICENSE("GPL v2");