diff options
Diffstat (limited to 'drivers/thermal/db8500_thermal.c')
| -rw-r--r-- | drivers/thermal/db8500_thermal.c | 531 |
1 files changed, 531 insertions, 0 deletions
diff --git a/drivers/thermal/db8500_thermal.c b/drivers/thermal/db8500_thermal.c new file mode 100644 index 000000000000..ec71ade3e317 --- /dev/null +++ b/drivers/thermal/db8500_thermal.c @@ -0,0 +1,531 @@ +/* + * db8500_thermal.c - DB8500 Thermal Management Implementation + * + * Copyright (C) 2012 ST-Ericsson + * Copyright (C) 2012 Linaro Ltd. + * + * Author: Hongbo Zhang <hongbo.zhang@linaro.com> + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/cpu_cooling.h> +#include <linux/interrupt.h> +#include <linux/mfd/dbx500-prcmu.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_data/db8500_thermal.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/thermal.h> + +#define PRCMU_DEFAULT_MEASURE_TIME 0xFFF +#define PRCMU_DEFAULT_LOW_TEMP 0 + +struct db8500_thermal_zone { + struct thermal_zone_device *therm_dev; + struct mutex th_lock; + struct work_struct therm_work; + struct db8500_thsens_platform_data *trip_tab; + enum thermal_device_mode mode; + enum thermal_trend trend; + unsigned long cur_temp_pseudo; + unsigned int cur_index; +}; + +/* Local function to check if thermal zone matches cooling devices */ +static int db8500_thermal_match_cdev(struct thermal_cooling_device *cdev, + struct db8500_trip_point *trip_point) +{ + int i; + + if (!strlen(cdev->type)) + return -EINVAL; + + for (i = 0; i < COOLING_DEV_MAX; i++) { + if (!strcmp(trip_point->cdev_name[i], cdev->type)) + return 0; + } + + return -ENODEV; +} + +/* Callback to bind cooling device to thermal zone */ +static int db8500_cdev_bind(struct thermal_zone_device *thermal, + struct thermal_cooling_device *cdev) +{ + struct db8500_thermal_zone *pzone = thermal->devdata; + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab; + unsigned long max_state, upper, lower; + int i, ret = -EINVAL; + + cdev->ops->get_max_state(cdev, &max_state); + + for (i = 0; i < ptrips->num_trips; i++) { + if (db8500_thermal_match_cdev(cdev, &ptrips->trip_points[i])) + continue; + + upper = lower = i > max_state ? max_state : i; + + ret = thermal_zone_bind_cooling_device(thermal, i, cdev, + upper, lower); + + dev_info(&cdev->device, "%s bind to %d: %d-%s\n", cdev->type, + i, ret, ret ? "fail" : "succeed"); + } + + return ret; +} + +/* Callback to unbind cooling device from thermal zone */ +static int db8500_cdev_unbind(struct thermal_zone_device *thermal, + struct thermal_cooling_device *cdev) +{ + struct db8500_thermal_zone *pzone = thermal->devdata; + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab; + int i, ret = -EINVAL; + + for (i = 0; i < ptrips->num_trips; i++) { + if (db8500_thermal_match_cdev(cdev, &ptrips->trip_points[i])) + continue; + + ret = thermal_zone_unbind_cooling_device(thermal, i, cdev); + + dev_info(&cdev->device, "%s unbind from %d: %s\n", cdev->type, + i, ret ? "fail" : "succeed"); + } + + return ret; +} + +/* Callback to get current temperature */ +static int db8500_sys_get_temp(struct thermal_zone_device *thermal, + unsigned long *temp) +{ + struct db8500_thermal_zone *pzone = thermal->devdata; + + /* + * TODO: There is no PRCMU interface to get temperature data currently, + * so a pseudo temperature is returned , it works for thermal framework + * and this will be fixed when the PRCMU interface is available. + */ + *temp = pzone->cur_temp_pseudo; + + return 0; +} + +/* Callback to get temperature changing trend */ +static int db8500_sys_get_trend(struct thermal_zone_device *thermal, + int trip, enum thermal_trend *trend) +{ + struct db8500_thermal_zone *pzone = thermal->devdata; + + *trend = pzone->trend; + + return 0; +} + +/* Callback to get thermal zone mode */ +static int db8500_sys_get_mode(struct thermal_zone_device *thermal, + enum thermal_device_mode *mode) +{ + struct db8500_thermal_zone *pzone = thermal->devdata; + + mutex_lock(&pzone->th_lock); + *mode = pzone->mode; + mutex_unlock(&pzone->th_lock); + + return 0; +} + +/* Callback to set thermal zone mode */ +static int db8500_sys_set_mode(struct thermal_zone_device *thermal, + enum thermal_device_mode mode) +{ + struct db8500_thermal_zone *pzone = thermal->devdata; + + mutex_lock(&pzone->th_lock); + + pzone->mode = mode; + if (mode == THERMAL_DEVICE_ENABLED) + schedule_work(&pzone->therm_work); + + mutex_unlock(&pzone->th_lock); + + return 0; +} + +/* Callback to get trip point type */ +static int db8500_sys_get_trip_type(struct thermal_zone_device *thermal, + int trip, enum thermal_trip_type *type) +{ + struct db8500_thermal_zone *pzone = thermal->devdata; + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab; + + if (trip >= ptrips->num_trips) + return -EINVAL; + + *type = ptrips->trip_points[trip].type; + + return 0; +} + +/* Callback to get trip point temperature */ +static int db8500_sys_get_trip_temp(struct thermal_zone_device *thermal, + int trip, unsigned long *temp) +{ + struct db8500_thermal_zone *pzone = thermal->devdata; + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab; + + if (trip >= ptrips->num_trips) + return -EINVAL; + + *temp = ptrips->trip_points[trip].temp; + + return 0; +} + +/* Callback to get critical trip point temperature */ +static int db8500_sys_get_crit_temp(struct thermal_zone_device *thermal, + unsigned long *temp) +{ + struct db8500_thermal_zone *pzone = thermal->devdata; + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab; + int i; + + for (i = ptrips->num_trips - 1; i > 0; i--) { + if (ptrips->trip_points[i].type == THERMAL_TRIP_CRITICAL) { + *temp = ptrips->trip_points[i].temp; + return 0; + } + } + + return -EINVAL; +} + +static struct thermal_zone_device_ops thdev_ops = { + .bind = db8500_cdev_bind, + .unbind = db8500_cdev_unbind, + .get_temp = db8500_sys_get_temp, + .get_trend = db8500_sys_get_trend, + .get_mode = db8500_sys_get_mode, + .set_mode = db8500_sys_set_mode, + .get_trip_type = db8500_sys_get_trip_type, + .get_trip_temp = db8500_sys_get_trip_temp, + .get_crit_temp = db8500_sys_get_crit_temp, +}; + +static void db8500_thermal_update_config(struct db8500_thermal_zone *pzone, + unsigned int idx, enum thermal_trend trend, + unsigned long next_low, unsigned long next_high) +{ + prcmu_stop_temp_sense(); + + pzone->cur_index = idx; + pzone->cur_temp_pseudo = (next_low + next_high)/2; + pzone->trend = trend; + + prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000)); + prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME); +} + +static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data) +{ + struct db8500_thermal_zone *pzone = irq_data; + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab; + unsigned int idx = pzone->cur_index; + unsigned long next_low, next_high; + + if (unlikely(idx == 0)) + /* Meaningless for thermal management, ignoring it */ + return IRQ_HANDLED; + + if (idx == 1) { + next_high = ptrips->trip_points[0].temp; + next_low = PRCMU_DEFAULT_LOW_TEMP; + } else { + next_high = ptrips->trip_points[idx-1].temp; + next_low = ptrips->trip_points[idx-2].temp; + } + idx -= 1; + + db8500_thermal_update_config(pzone, idx, THERMAL_TREND_DROPPING, + next_low, next_high); + + dev_dbg(&pzone->therm_dev->device, + "PRCMU set max %ld, min %ld\n", next_high, next_low); + + schedule_work(&pzone->therm_work); + + return IRQ_HANDLED; +} + +static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data) +{ + struct db8500_thermal_zone *pzone = irq_data; + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab; + unsigned int idx = pzone->cur_index; + unsigned long next_low, next_high; + + if (idx < ptrips->num_trips - 1) { + next_high = ptrips->trip_points[idx+1].temp; + next_low = ptrips->trip_points[idx].temp; + idx += 1; + + db8500_thermal_update_config(pzone, idx, THERMAL_TREND_RAISING, + next_low, next_high); + + dev_dbg(&pzone->therm_dev->device, + "PRCMU set max %ld, min %ld\n", next_high, next_low); + } else if (idx == ptrips->num_trips - 1) + pzone->cur_temp_pseudo = ptrips->trip_points[idx].temp + 1; + + schedule_work(&pzone->therm_work); + + return IRQ_HANDLED; +} + +static void db8500_thermal_work(struct work_struct *work) +{ + enum thermal_device_mode cur_mode; + struct db8500_thermal_zone *pzone; + + pzone = container_of(work, struct db8500_thermal_zone, therm_work); + + mutex_lock(&pzone->th_lock); + cur_mode = pzone->mode; + mutex_unlock(&pzone->th_lock); + + if (cur_mode == THERMAL_DEVICE_DISABLED) + return; + + thermal_zone_device_update(pzone->therm_dev); + dev_dbg(&pzone->therm_dev->device, "thermal work finished.\n"); +} + +#ifdef CONFIG_OF +static struct db8500_thsens_platform_data* + db8500_thermal_parse_dt(struct platform_device *pdev) +{ + struct db8500_thsens_platform_data *ptrips; + struct device_node *np = pdev->dev.of_node; + char prop_name[32]; + const char *tmp_str; + u32 tmp_data; + int i, j; + + ptrips = devm_kzalloc(&pdev->dev, sizeof(*ptrips), GFP_KERNEL); + if (!ptrips) + return NULL; + + if (of_property_read_u32(np, "num-trips", &tmp_data)) + goto err_parse_dt; + + if (tmp_data > THERMAL_MAX_TRIPS) + goto err_parse_dt; + + ptrips->num_trips = tmp_data; + + for (i = 0; i < ptrips->num_trips; i++) { + sprintf(prop_name, "trip%d-temp", i); + if (of_property_read_u32(np, prop_name, &tmp_data)) + goto err_parse_dt; + + ptrips->trip_points[i].temp = tmp_data; + + sprintf(prop_name, "trip%d-type", i); + if (of_property_read_string(np, prop_name, &tmp_str)) + goto err_parse_dt; + + if (!strcmp(tmp_str, "active")) + ptrips->trip_points[i].type = THERMAL_TRIP_ACTIVE; + else if (!strcmp(tmp_str, "passive")) + ptrips->trip_points[i].type = THERMAL_TRIP_PASSIVE; + else if (!strcmp(tmp_str, "hot")) + ptrips->trip_points[i].type = THERMAL_TRIP_HOT; + else if (!strcmp(tmp_str, "critical")) + ptrips->trip_points[i].type = THERMAL_TRIP_CRITICAL; + else + goto err_parse_dt; + + sprintf(prop_name, "trip%d-cdev-num", i); + if (of_property_read_u32(np, prop_name, &tmp_data)) + goto err_parse_dt; + + if (tmp_data > COOLING_DEV_MAX) + goto err_parse_dt; + + for (j = 0; j < tmp_data; j++) { + sprintf(prop_name, "trip%d-cdev-name%d", i, j); + if (of_property_read_string(np, prop_name, &tmp_str)) + goto err_parse_dt; + + if (strlen(tmp_str) >= THERMAL_NAME_LENGTH) + goto err_parse_dt; + + strcpy(ptrips->trip_points[i].cdev_name[j], tmp_str); + } + } + return ptrips; + +err_parse_dt: + dev_err(&pdev->dev, "Parsing device tree data error.\n"); + return NULL; +} +#else +static inline struct db8500_thsens_platform_data* + db8500_thermal_parse_dt(struct platform_device *pdev) +{ + return NULL; +} +#endif + +static int db8500_thermal_probe(struct platform_device *pdev) +{ + struct db8500_thermal_zone *pzone = NULL; + struct db8500_thsens_platform_data *ptrips = NULL; + struct device_node *np = pdev->dev.of_node; + int low_irq, high_irq, ret = 0; + unsigned long dft_low, dft_high; + + if (np) + ptrips = db8500_thermal_parse_dt(pdev); + else + ptrips = dev_get_platdata(&pdev->dev); + + if (!ptrips) + return -EINVAL; + + pzone = devm_kzalloc(&pdev->dev, sizeof(*pzone), GFP_KERNEL); + if (!pzone) + return -ENOMEM; + + mutex_init(&pzone->th_lock); + mutex_lock(&pzone->th_lock); + + pzone->mode = THERMAL_DEVICE_DISABLED; + pzone->trip_tab = ptrips; + + INIT_WORK(&pzone->therm_work, db8500_thermal_work); + + low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW"); + if (low_irq < 0) { + dev_err(&pdev->dev, "Get IRQ_HOTMON_LOW failed.\n"); + return low_irq; + } + + ret = devm_request_threaded_irq(&pdev->dev, low_irq, NULL, + prcmu_low_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT, + "dbx500_temp_low", pzone); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to allocate temp low irq.\n"); + return ret; + } + + high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH"); + if (high_irq < 0) { + dev_err(&pdev->dev, "Get IRQ_HOTMON_HIGH failed.\n"); + return high_irq; + } + + ret = devm_request_threaded_irq(&pdev->dev, high_irq, NULL, + prcmu_high_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT, + "dbx500_temp_high", pzone); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to allocate temp high irq.\n"); + return ret; + } + + pzone->therm_dev = thermal_zone_device_register("db8500_thermal_zone", + ptrips->num_trips, 0, pzone, &thdev_ops, NULL, 0, 0); + + if (IS_ERR_OR_NULL(pzone->therm_dev)) { + dev_err(&pdev->dev, "Register thermal zone device failed.\n"); + return PTR_ERR(pzone->therm_dev); + } + dev_info(&pdev->dev, "Thermal zone device registered.\n"); + + dft_low = PRCMU_DEFAULT_LOW_TEMP; + dft_high = ptrips->trip_points[0].temp; + + db8500_thermal_update_config(pzone, 0, THERMAL_TREND_STABLE, + dft_low, dft_high); + + platform_set_drvdata(pdev, pzone); + pzone->mode = THERMAL_DEVICE_ENABLED; + mutex_unlock(&pzone->th_lock); + + return 0; +} + +static int db8500_thermal_remove(struct platform_device *pdev) +{ + struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev); + + thermal_zone_device_unregister(pzone->therm_dev); + cancel_work_sync(&pzone->therm_work); + mutex_destroy(&pzone->th_lock); + + return 0; +} + +static int db8500_thermal_suspend(struct platform_device *pdev, + pm_message_t state) +{ + struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev); + + flush_work(&pzone->therm_work); + prcmu_stop_temp_sense(); + + return 0; +} + +static int db8500_thermal_resume(struct platform_device *pdev) +{ + struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev); + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab; + unsigned long dft_low, dft_high; + + dft_low = PRCMU_DEFAULT_LOW_TEMP; + dft_high = ptrips->trip_points[0].temp; + + db8500_thermal_update_config(pzone, 0, THERMAL_TREND_STABLE, + dft_low, dft_high); + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id db8500_thermal_match[] = { + { .compatible = "stericsson,db8500-thermal" }, + {}, +}; +#else +#define db8500_thermal_match NULL +#endif + +static struct platform_driver db8500_thermal_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "db8500-thermal", + .of_match_table = db8500_thermal_match, + }, + .probe = db8500_thermal_probe, + .suspend = db8500_thermal_suspend, + .resume = db8500_thermal_resume, + .remove = db8500_thermal_remove, +}; + +module_platform_driver(db8500_thermal_driver); + +MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>"); +MODULE_DESCRIPTION("DB8500 thermal driver"); +MODULE_LICENSE("GPL"); |