1 files changed, 656 insertions, 0 deletions

diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
new file mode 100644
index 000000000..140386d7c
--- /dev/null
+++ b/drivers/thermal/rcar_thermal.c
@@ -0,0 +1,656 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  R-Car THS/TSC thermal sensor driver
+ *
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+ */
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reboot.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/thermal.h>
+
+#include "thermal_hwmon.h"
+
+#define IDLE_INTERVAL	5000
+
+#define COMMON_STR	0x00
+#define COMMON_ENR	0x04
+#define COMMON_INTMSK	0x0c
+
+#define REG_POSNEG	0x20
+#define REG_FILONOFF	0x28
+#define REG_THSCR	0x2c
+#define REG_THSSR	0x30
+#define REG_INTCTRL	0x34
+
+/* THSCR */
+#define CPCTL	(1 << 12)
+
+/* THSSR */
+#define CTEMP	0x3f
+
+struct rcar_thermal_common {
+	void __iomem *base;
+	struct device *dev;
+	struct list_head head;
+	spinlock_t lock;
+};
+
+struct rcar_thermal_chip {
+	unsigned int use_of_thermal : 1;
+	unsigned int has_filonoff : 1;
+	unsigned int irq_per_ch : 1;
+	unsigned int needs_suspend_resume : 1;
+	unsigned int nirqs;
+};
+
+static const struct rcar_thermal_chip rcar_thermal = {
+	.use_of_thermal = 0,
+	.has_filonoff = 1,
+	.irq_per_ch = 0,
+	.needs_suspend_resume = 0,
+	.nirqs = 1,
+};
+
+static const struct rcar_thermal_chip rcar_gen2_thermal = {
+	.use_of_thermal = 1,
+	.has_filonoff = 1,
+	.irq_per_ch = 0,
+	.needs_suspend_resume = 0,
+	.nirqs = 1,
+};
+
+static const struct rcar_thermal_chip rcar_gen3_thermal = {
+	.use_of_thermal = 1,
+	.has_filonoff = 0,
+	.irq_per_ch = 1,
+	.needs_suspend_resume = 1,
+	/*
+	 * The Gen3 chip has 3 interrupts, but this driver uses only 2
+	 * interrupts to detect a temperature change, rise or fall.
+	 */
+	.nirqs = 2,
+};
+
+struct rcar_thermal_priv {
+	void __iomem *base;
+	struct rcar_thermal_common *common;
+	struct thermal_zone_device *zone;
+	const struct rcar_thermal_chip *chip;
+	struct delayed_work work;
+	struct mutex lock;
+	struct list_head list;
+	int id;
+	u32 ctemp;
+};
+
+#define rcar_thermal_for_each_priv(pos, common)	\
+	list_for_each_entry(pos, &common->head, list)
+
+#define MCELSIUS(temp)			((temp) * 1000)
+#define rcar_zone_to_priv(zone)		((zone)->devdata)
+#define rcar_priv_to_dev(priv)		((priv)->common->dev)
+#define rcar_has_irq_support(priv)	((priv)->common->base)
+#define rcar_id_to_shift(priv)		((priv)->id * 8)
+
+static const struct of_device_id rcar_thermal_dt_ids[] = {
+	{
+		.compatible = "renesas,rcar-thermal",
+		.data = &rcar_thermal,
+	},
+	{
+		.compatible = "renesas,rcar-gen2-thermal",
+		 .data = &rcar_gen2_thermal,
+	},
+	{
+		.compatible = "renesas,thermal-r8a77995",
+		.data = &rcar_gen3_thermal,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
+
+/*
+ *		basic functions
+ */
+#define rcar_thermal_common_read(c, r) \
+	_rcar_thermal_common_read(c, COMMON_ ##r)
+static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
+				     u32 reg)
+{
+	return ioread32(common->base + reg);
+}
+
+#define rcar_thermal_common_write(c, r, d) \
+	_rcar_thermal_common_write(c, COMMON_ ##r, d)
+static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
+				       u32 reg, u32 data)
+{
+	iowrite32(data, common->base + reg);
+}
+
+#define rcar_thermal_common_bset(c, r, m, d) \
+	_rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
+static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
+				      u32 reg, u32 mask, u32 data)
+{
+	u32 val;
+
+	val = ioread32(common->base + reg);
+	val &= ~mask;
+	val |= (data & mask);
+	iowrite32(val, common->base + reg);
+}
+
+#define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
+static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
+{
+	return ioread32(priv->base + reg);
+}
+
+#define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
+static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
+				u32 reg, u32 data)
+{
+	iowrite32(data, priv->base + reg);
+}
+
+#define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
+static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
+			       u32 mask, u32 data)
+{
+	u32 val;
+
+	val = ioread32(priv->base + reg);
+	val &= ~mask;
+	val |= (data & mask);
+	iowrite32(val, priv->base + reg);
+}
+
+/*
+ *		zone device functions
+ */
+static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
+{
+	struct device *dev = rcar_priv_to_dev(priv);
+	int i;
+	u32 ctemp, old, new;
+	int ret = -EINVAL;
+
+	mutex_lock(&priv->lock);
+
+	/*
+	 * TSC decides a value of CPTAP automatically,
+	 * and this is the conditions which validate interrupt.
+	 */
+	rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
+
+	ctemp = 0;
+	old = ~0;
+	for (i = 0; i < 128; i++) {
+		/*
+		 * we need to wait 300us after changing comparator offset
+		 * to get stable temperature.
+		 * see "Usage Notes" on datasheet
+		 */
+		udelay(300);
+
+		new = rcar_thermal_read(priv, THSSR) & CTEMP;
+		if (new == old) {
+			ctemp = new;
+			break;
+		}
+		old = new;
+	}
+
+	if (!ctemp) {
+		dev_err(dev, "thermal sensor was broken\n");
+		goto err_out_unlock;
+	}
+
+	/*
+	 * enable IRQ
+	 */
+	if (rcar_has_irq_support(priv)) {
+		if (priv->chip->has_filonoff)
+			rcar_thermal_write(priv, FILONOFF, 0);
+
+		/* enable Rising/Falling edge interrupt */
+		rcar_thermal_write(priv, POSNEG,  0x1);
+		rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) |
+						   ((ctemp - 1) << 0)));
+	}
+
+	dev_dbg(dev, "thermal%d  %d -> %d\n", priv->id, priv->ctemp, ctemp);
+
+	priv->ctemp = ctemp;
+	ret = 0;
+err_out_unlock:
+	mutex_unlock(&priv->lock);
+	return ret;
+}
+
+static int rcar_thermal_get_current_temp(struct rcar_thermal_priv *priv,
+					 int *temp)
+{
+	int tmp;
+	int ret;
+
+	ret = rcar_thermal_update_temp(priv);
+	if (ret < 0)
+		return ret;
+
+	mutex_lock(&priv->lock);
+	tmp =  MCELSIUS((priv->ctemp * 5) - 65);
+	mutex_unlock(&priv->lock);
+
+	if ((tmp < MCELSIUS(-45)) || (tmp > MCELSIUS(125))) {
+		struct device *dev = rcar_priv_to_dev(priv);
+
+		dev_err(dev, "it couldn't measure temperature correctly\n");
+		return -EIO;
+	}
+
+	*temp = tmp;
+
+	return 0;
+}
+
+static int rcar_thermal_of_get_temp(void *data, int *temp)
+{
+	struct rcar_thermal_priv *priv = data;
+
+	return rcar_thermal_get_current_temp(priv, temp);
+}
+
+static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp)
+{
+	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
+
+	return rcar_thermal_get_current_temp(priv, temp);
+}
+
+static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
+				      int trip, enum thermal_trip_type *type)
+{
+	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
+	struct device *dev = rcar_priv_to_dev(priv);
+
+	/* see rcar_thermal_get_temp() */
+	switch (trip) {
+	case 0: /* +90 <= temp */
+		*type = THERMAL_TRIP_CRITICAL;
+		break;
+	default:
+		dev_err(dev, "rcar driver trip error\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
+				      int trip, int *temp)
+{
+	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
+	struct device *dev = rcar_priv_to_dev(priv);
+
+	/* see rcar_thermal_get_temp() */
+	switch (trip) {
+	case 0: /* +90 <= temp */
+		*temp = MCELSIUS(90);
+		break;
+	default:
+		dev_err(dev, "rcar driver trip error\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int rcar_thermal_notify(struct thermal_zone_device *zone,
+			       int trip, enum thermal_trip_type type)
+{
+	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
+	struct device *dev = rcar_priv_to_dev(priv);
+
+	switch (type) {
+	case THERMAL_TRIP_CRITICAL:
+		/* FIXME */
+		dev_warn(dev, "Thermal reached to critical temperature\n");
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static const struct thermal_zone_of_device_ops rcar_thermal_zone_of_ops = {
+	.get_temp	= rcar_thermal_of_get_temp,
+};
+
+static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
+	.get_temp	= rcar_thermal_get_temp,
+	.get_trip_type	= rcar_thermal_get_trip_type,
+	.get_trip_temp	= rcar_thermal_get_trip_temp,
+	.notify		= rcar_thermal_notify,
+};
+
+/*
+ *		interrupt
+ */
+#define rcar_thermal_irq_enable(p)	_rcar_thermal_irq_ctrl(p, 1)
+#define rcar_thermal_irq_disable(p)	_rcar_thermal_irq_ctrl(p, 0)
+static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
+{
+	struct rcar_thermal_common *common = priv->common;
+	unsigned long flags;
+	u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
+
+	if (!rcar_has_irq_support(priv))
+		return;
+
+	spin_lock_irqsave(&common->lock, flags);
+
+	rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
+
+	spin_unlock_irqrestore(&common->lock, flags);
+}
+
+static void rcar_thermal_work(struct work_struct *work)
+{
+	struct rcar_thermal_priv *priv;
+	int cctemp, nctemp;
+	int ret;
+
+	priv = container_of(work, struct rcar_thermal_priv, work.work);
+
+	ret = rcar_thermal_get_current_temp(priv, &cctemp);
+	if (ret < 0)
+		return;
+
+	ret = rcar_thermal_update_temp(priv);
+	if (ret < 0)
+		return;
+
+	rcar_thermal_irq_enable(priv);
+
+	ret = rcar_thermal_get_current_temp(priv, &nctemp);
+	if (ret < 0)
+		return;
+
+	if (nctemp != cctemp)
+		thermal_zone_device_update(priv->zone,
+					   THERMAL_EVENT_UNSPECIFIED);
+}
+
+static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
+{
+	struct device *dev = rcar_priv_to_dev(priv);
+
+	status = (status >> rcar_id_to_shift(priv)) & 0x3;
+
+	if (status) {
+		dev_dbg(dev, "thermal%d %s%s\n",
+			priv->id,
+			(status & 0x2) ? "Rising " : "",
+			(status & 0x1) ? "Falling" : "");
+	}
+
+	return status;
+}
+
+static irqreturn_t rcar_thermal_irq(int irq, void *data)
+{
+	struct rcar_thermal_common *common = data;
+	struct rcar_thermal_priv *priv;
+	unsigned long flags;
+	u32 status, mask;
+
+	spin_lock_irqsave(&common->lock, flags);
+
+	mask	= rcar_thermal_common_read(common, INTMSK);
+	status	= rcar_thermal_common_read(common, STR);
+	rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
+
+	spin_unlock_irqrestore(&common->lock, flags);
+
+	status = status & ~mask;
+
+	/*
+	 * check the status
+	 */
+	rcar_thermal_for_each_priv(priv, common) {
+		if (rcar_thermal_had_changed(priv, status)) {
+			rcar_thermal_irq_disable(priv);
+			queue_delayed_work(system_freezable_wq, &priv->work,
+					   msecs_to_jiffies(300));
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ *		platform functions
+ */
+static int rcar_thermal_remove(struct platform_device *pdev)
+{
+	struct rcar_thermal_common *common = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+	struct rcar_thermal_priv *priv;
+
+	rcar_thermal_for_each_priv(priv, common) {
+		rcar_thermal_irq_disable(priv);
+		cancel_delayed_work_sync(&priv->work);
+		if (priv->chip->use_of_thermal)
+			thermal_remove_hwmon_sysfs(priv->zone);
+		else
+			thermal_zone_device_unregister(priv->zone);
+	}
+
+	pm_runtime_put(dev);
+	pm_runtime_disable(dev);
+
+	return 0;
+}
+
+static int rcar_thermal_probe(struct platform_device *pdev)
+{
+	struct rcar_thermal_common *common;
+	struct rcar_thermal_priv *priv;
+	struct device *dev = &pdev->dev;
+	struct resource *res, *irq;
+	const struct rcar_thermal_chip *chip = of_device_get_match_data(dev);
+	int mres = 0;
+	int i;
+	int ret = -ENODEV;
+	int idle = IDLE_INTERVAL;
+	u32 enr_bits = 0;
+
+	common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
+	if (!common)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, common);
+
+	INIT_LIST_HEAD(&common->head);
+	spin_lock_init(&common->lock);
+	common->dev = dev;
+
+	pm_runtime_enable(dev);
+	pm_runtime_get_sync(dev);
+
+	for (i = 0; i < chip->nirqs; i++) {
+		irq = platform_get_resource(pdev, IORESOURCE_IRQ, i);
+		if (!irq)
+			continue;
+		if (!common->base) {
+			/*
+			 * platform has IRQ support.
+			 * Then, driver uses common registers
+			 * rcar_has_irq_support() will be enabled
+			 */
+			res = platform_get_resource(pdev, IORESOURCE_MEM,
+						    mres++);
+			common->base = devm_ioremap_resource(dev, res);
+			if (IS_ERR(common->base)) {
+				ret = PTR_ERR(common->base);
+				goto error_unregister;
+			}
+
+			idle = 0; /* polling delay is not needed */
+		}
+
+		ret = devm_request_irq(dev, irq->start, rcar_thermal_irq,
+				       IRQF_SHARED, dev_name(dev), common);
+		if (ret) {
+			dev_err(dev, "irq request failed\n ");
+			goto error_unregister;
+		}
+
+		/* update ENR bits */
+		if (chip->irq_per_ch)
+			enr_bits |= 1 << i;
+	}
+
+	for (i = 0;; i++) {
+		res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
+		if (!res)
+			break;
+
+		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+		if (!priv) {
+			ret = -ENOMEM;
+			goto error_unregister;
+		}
+
+		priv->base = devm_ioremap_resource(dev, res);
+		if (IS_ERR(priv->base)) {
+			ret = PTR_ERR(priv->base);
+			goto error_unregister;
+		}
+
+		priv->common = common;
+		priv->id = i;
+		priv->chip = chip;
+		mutex_init(&priv->lock);
+		INIT_LIST_HEAD(&priv->list);
+		INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
+		ret = rcar_thermal_update_temp(priv);
+		if (ret < 0)
+			goto error_unregister;
+
+		if (chip->use_of_thermal)
+			priv->zone = devm_thermal_zone_of_sensor_register(
+						dev, i, priv,
+						&rcar_thermal_zone_of_ops);
+		else
+			priv->zone = thermal_zone_device_register(
+						"rcar_thermal",
+						1, 0, priv,
+						&rcar_thermal_zone_ops, NULL, 0,
+						idle);
+		if (IS_ERR(priv->zone)) {
+			dev_err(dev, "can't register thermal zone\n");
+			ret = PTR_ERR(priv->zone);
+			priv->zone = NULL;
+			goto error_unregister;
+		}
+
+		if (chip->use_of_thermal) {
+			/*
+			 * thermal_zone doesn't enable hwmon as default,
+			 * but, enable it here to keep compatible
+			 */
+			priv->zone->tzp->no_hwmon = false;
+			ret = thermal_add_hwmon_sysfs(priv->zone);
+			if (ret)
+				goto error_unregister;
+		}
+
+		rcar_thermal_irq_enable(priv);
+
+		list_move_tail(&priv->list, &common->head);
+
+		/* update ENR bits */
+		if (!chip->irq_per_ch)
+			enr_bits |= 3 << (i * 8);
+	}
+
+	if (common->base && enr_bits)
+		rcar_thermal_common_write(common, ENR, enr_bits);
+
+	dev_info(dev, "%d sensor probed\n", i);
+
+	return 0;
+
+error_unregister:
+	rcar_thermal_remove(pdev);
+
+	return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int rcar_thermal_suspend(struct device *dev)
+{
+	struct rcar_thermal_common *common = dev_get_drvdata(dev);
+	struct rcar_thermal_priv *priv = list_first_entry(&common->head,
+							  typeof(*priv), list);
+
+	if (priv->chip->needs_suspend_resume) {
+		rcar_thermal_common_write(common, ENR, 0);
+		rcar_thermal_irq_disable(priv);
+		rcar_thermal_bset(priv, THSCR, CPCTL, 0);
+	}
+
+	return 0;
+}
+
+static int rcar_thermal_resume(struct device *dev)
+{
+	struct rcar_thermal_common *common = dev_get_drvdata(dev);
+	struct rcar_thermal_priv *priv = list_first_entry(&common->head,
+							  typeof(*priv), list);
+	int ret;
+
+	if (priv->chip->needs_suspend_resume) {
+		ret = rcar_thermal_update_temp(priv);
+		if (ret < 0)
+			return ret;
+		rcar_thermal_irq_enable(priv);
+		rcar_thermal_common_write(common, ENR, 0x03);
+	}
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(rcar_thermal_pm_ops, rcar_thermal_suspend,
+			 rcar_thermal_resume);
+
+static struct platform_driver rcar_thermal_driver = {
+	.driver	= {
+		.name	= "rcar_thermal",
+		.pm = &rcar_thermal_pm_ops,
+		.of_match_table = rcar_thermal_dt_ids,
+	},
+	.probe		= rcar_thermal_probe,
+	.remove		= rcar_thermal_remove,
+};
+module_platform_driver(rcar_thermal_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
+MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");