1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
new file mode 100644
index 000000000..343da0031
--- /dev/null
+++ b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
@@ -0,0 +1,286 @@
+/*
+ * OMAP thermal driver interface
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ * Contact:
+ *   Eduardo Valentin <eduardo.valentin@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/workqueue.h>
+#include <linux/thermal.h>
+#include <linux/cpufreq.h>
+#include <linux/cpumask.h>
+#include <linux/cpu_cooling.h>
+#include <linux/of.h>
+
+#include "ti-thermal.h"
+#include "ti-bandgap.h"
+
+/* common data structures */
+struct ti_thermal_data {
+	struct cpufreq_policy *policy;
+	struct thermal_zone_device *ti_thermal;
+	struct thermal_zone_device *pcb_tz;
+	struct thermal_cooling_device *cool_dev;
+	struct ti_bandgap *bgp;
+	enum thermal_device_mode mode;
+	struct work_struct thermal_wq;
+	int sensor_id;
+	bool our_zone;
+};
+
+static void ti_thermal_work(struct work_struct *work)
+{
+	struct ti_thermal_data *data = container_of(work,
+					struct ti_thermal_data, thermal_wq);
+
+	thermal_zone_device_update(data->ti_thermal, THERMAL_EVENT_UNSPECIFIED);
+
+	dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
+		data->ti_thermal->type);
+}
+
+/**
+ * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature
+ * @t:	omap sensor temperature
+ * @s:	omap sensor slope value
+ * @c:	omap sensor const value
+ */
+static inline int ti_thermal_hotspot_temperature(int t, int s, int c)
+{
+	int delta = t * s / 1000 + c;
+
+	if (delta < 0)
+		delta = 0;
+
+	return t + delta;
+}
+
+/* thermal zone ops */
+/* Get temperature callback function for thermal zone */
+static inline int __ti_thermal_get_temp(void *devdata, int *temp)
+{
+	struct thermal_zone_device *pcb_tz = NULL;
+	struct ti_thermal_data *data = devdata;
+	struct ti_bandgap *bgp;
+	const struct ti_temp_sensor *s;
+	int ret, tmp, slope, constant;
+	int pcb_temp;
+
+	if (!data)
+		return 0;
+
+	bgp = data->bgp;
+	s = &bgp->conf->sensors[data->sensor_id];
+
+	ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp);
+	if (ret)
+		return ret;
+
+	/* Default constants */
+	slope = thermal_zone_get_slope(data->ti_thermal);
+	constant = thermal_zone_get_offset(data->ti_thermal);
+
+	pcb_tz = data->pcb_tz;
+	/* In case pcb zone is available, use the extrapolation rule with it */
+	if (!IS_ERR(pcb_tz)) {
+		ret = thermal_zone_get_temp(pcb_tz, &pcb_temp);
+		if (!ret) {
+			tmp -= pcb_temp; /* got a valid PCB temp */
+			slope = s->slope_pcb;
+			constant = s->constant_pcb;
+		} else {
+			dev_err(bgp->dev,
+				"Failed to read PCB state. Using defaults\n");
+			ret = 0;
+		}
+	}
+	*temp = ti_thermal_hotspot_temperature(tmp, slope, constant);
+
+	return ret;
+}
+
+static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
+				      int *temp)
+{
+	struct ti_thermal_data *data = thermal->devdata;
+
+	return __ti_thermal_get_temp(data, temp);
+}
+
+static int __ti_thermal_get_trend(void *p, int trip, enum thermal_trend *trend)
+{
+	struct ti_thermal_data *data = p;
+	struct ti_bandgap *bgp;
+	int id, tr, ret = 0;
+
+	bgp = data->bgp;
+	id = data->sensor_id;
+
+	ret = ti_bandgap_get_trend(bgp, id, &tr);
+	if (ret)
+		return ret;
+
+	if (tr > 0)
+		*trend = THERMAL_TREND_RAISING;
+	else if (tr < 0)
+		*trend = THERMAL_TREND_DROPPING;
+	else
+		*trend = THERMAL_TREND_STABLE;
+
+	return 0;
+}
+
+static const struct thermal_zone_of_device_ops ti_of_thermal_ops = {
+	.get_temp = __ti_thermal_get_temp,
+	.get_trend = __ti_thermal_get_trend,
+};
+
+static struct ti_thermal_data
+*ti_thermal_build_data(struct ti_bandgap *bgp, int id)
+{
+	struct ti_thermal_data *data;
+
+	data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
+	if (!data) {
+		dev_err(bgp->dev, "kzalloc fail\n");
+		return NULL;
+	}
+	data->sensor_id = id;
+	data->bgp = bgp;
+	data->mode = THERMAL_DEVICE_ENABLED;
+	/* pcb_tz will be either valid or PTR_ERR() */
+	data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
+	INIT_WORK(&data->thermal_wq, ti_thermal_work);
+
+	return data;
+}
+
+int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
+			     char *domain)
+{
+	struct ti_thermal_data *data;
+
+	data = ti_bandgap_get_sensor_data(bgp, id);
+
+	if (IS_ERR_OR_NULL(data))
+		data = ti_thermal_build_data(bgp, id);
+
+	if (!data)
+		return -EINVAL;
+
+	/* in case this is specified by DT */
+	data->ti_thermal = devm_thermal_zone_of_sensor_register(bgp->dev, id,
+					data, &ti_of_thermal_ops);
+	if (IS_ERR(data->ti_thermal)) {
+		dev_err(bgp->dev, "thermal zone device is NULL\n");
+		return PTR_ERR(data->ti_thermal);
+	}
+
+	ti_bandgap_set_sensor_data(bgp, id, data);
+	ti_bandgap_write_update_interval(bgp, data->sensor_id,
+					data->ti_thermal->polling_delay);
+
+	return 0;
+}
+
+int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
+{
+	struct ti_thermal_data *data;
+
+	data = ti_bandgap_get_sensor_data(bgp, id);
+
+	if (!IS_ERR_OR_NULL(data) && data->ti_thermal) {
+		if (data->our_zone)
+			thermal_zone_device_unregister(data->ti_thermal);
+	}
+
+	return 0;
+}
+
+int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
+{
+	struct ti_thermal_data *data;
+
+	data = ti_bandgap_get_sensor_data(bgp, id);
+
+	schedule_work(&data->thermal_wq);
+
+	return 0;
+}
+
+int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
+{
+	struct ti_thermal_data *data;
+	struct device_node *np = bgp->dev->of_node;
+
+	/*
+	 * We are assuming here that if one deploys the zone
+	 * using DT, then it must be aware that the cooling device
+	 * loading has to happen via cpufreq driver.
+	 */
+	if (of_find_property(np, "#thermal-sensor-cells", NULL))
+		return 0;
+
+	data = ti_bandgap_get_sensor_data(bgp, id);
+	if (!data || IS_ERR(data))
+		data = ti_thermal_build_data(bgp, id);
+
+	if (!data)
+		return -EINVAL;
+
+	data->policy = cpufreq_cpu_get(0);
+	if (!data->policy) {
+		pr_debug("%s: CPUFreq policy not found\n", __func__);
+		return -EPROBE_DEFER;
+	}
+
+	/* Register cooling device */
+	data->cool_dev = cpufreq_cooling_register(data->policy);
+	if (IS_ERR(data->cool_dev)) {
+		int ret = PTR_ERR(data->cool_dev);
+		dev_err(bgp->dev, "Failed to register cpu cooling device %d\n",
+			ret);
+		cpufreq_cpu_put(data->policy);
+
+		return ret;
+	}
+	ti_bandgap_set_sensor_data(bgp, id, data);
+
+	return 0;
+}
+
+int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
+{
+	struct ti_thermal_data *data;
+
+	data = ti_bandgap_get_sensor_data(bgp, id);
+
+	if (!IS_ERR_OR_NULL(data)) {
+		cpufreq_cooling_unregister(data->cool_dev);
+		if (data->policy)
+			cpufreq_cpu_put(data->policy);
+	}
+
+	return 0;
+}