[linux.git] / drivers / thermal / rcar_thermal.c

/*
 *  R-Car THS/TSC thermal sensor driver
 *
 * Copyright (C) 2012 Renesas Solutions Corp.
 * Kuninori Morimoto <[email protected]>
 *
 *  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; version 2 of the License.
 *
 *  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.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 */
#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_priv {
	void __iomem *base;
	struct rcar_thermal_common *common;
	struct thermal_zone_device *zone;
	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)
#define rcar_of_data(dev)		((unsigned long)of_device_get_match_data(dev))
#define rcar_use_of_thermal(dev)	(rcar_of_data(dev) == USE_OF_THERMAL)

#define USE_OF_THERMAL	1
static const struct of_device_id rcar_thermal_dt_ids[] = {
	{ .compatible = "renesas,rcar-thermal", },
	{ .compatible = "renesas,rcar-gen2-thermal", .data = (void *)USE_OF_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)) {
		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);
			schedule_delayed_work(&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);
		if (rcar_use_of_thermal(dev))
			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;
	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);

	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (irq) {
		/*
		 * 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))
			return PTR_ERR(common->base);

		idle = 0; /* polling delay is not needed */
	}

	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;
		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 (rcar_use_of_thermal(dev))
			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 (rcar_use_of_thermal(dev)) {
			/*
			 * 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 */
		enr_bits |= 3 << (i * 8);
	}

	/* enable temperature comparation */
	if (irq) {
		ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
				       dev_name(dev), common);
		if (ret) {
			dev_err(dev, "irq request failed\n ");
			goto error_unregister;
		}

		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;
}

static struct platform_driver rcar_thermal_driver = {
	.driver	= {
		.name	= "rcar_thermal",
		.of_match_table = rcar_thermal_dt_ids,
	},
	.probe		= rcar_thermal_probe,
	.remove		= rcar_thermal_remove,
};
module_platform_driver(rcar_thermal_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
MODULE_AUTHOR("Kuninori Morimoto <[email protected]>");
Commit	Line	Data
1e426ffd KM	1	/*
	2	* R-Car THS/TSC thermal sensor driver
	3	*
	4	* Copyright (C) 2012 Renesas Solutions Corp.
	5	* Kuninori Morimoto <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; version 2 of the License.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License along
	17	* with this program; if not, write to the Free Software Foundation, Inc.,
	18	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	19	*/
	20	#include <linux/delay.h>
	21	#include <linux/err.h>
e0a5172e KM	22	#include <linux/irq.h>
e0a5172e KM	23	#include <linux/interrupt.h>
1e426ffd KM	24	#include <linux/io.h>
1e426ffd KM	25	#include <linux/module.h>
8b477ea5	26	#include <linux/of_device.h>
1e426ffd	27	#include <linux/platform_device.h>
51d45d25	28	#include <linux/pm_runtime.h>
d2a73e22	29	#include <linux/reboot.h>
1e426ffd KM	30	#include <linux/slab.h>
	31	#include <linux/spinlock.h>
	32	#include <linux/thermal.h>
	33
64a411e8 KM	34	#include "thermal_hwmon.h"
64a411e8 KM	35
d2a73e22 KM	36	#define IDLE_INTERVAL 5000
d2a73e22 KM	37
e0a5172e KM	38	#define COMMON_STR 0x00
	39	#define COMMON_ENR 0x04
	40	#define COMMON_INTMSK 0x0c
	41
	42	#define REG_POSNEG 0x20
	43	#define REG_FILONOFF 0x28
e9137a58 KM	44	#define REG_THSCR 0x2c
e9137a58 KM	45	#define REG_THSSR 0x30
e0a5172e	46	#define REG_INTCTRL 0x34
1e426ffd KM	47
1e426ffd KM	48	/* THSCR */
f8f53e18	49	#define CPCTL (1 << 12)
1e426ffd KM	50
	51	/* THSSR */
	52	#define CTEMP 0x3f
	53
3676d1dd KM	54	struct rcar_thermal_common {
	55	void __iomem *base;
	56	struct device *dev;
	57	struct list_head head;
e0a5172e	58	spinlock_t lock;
3676d1dd	59	};
1e426ffd KM	60
	61	struct rcar_thermal_priv {
	62	void __iomem *base;
3676d1dd KM	63	struct rcar_thermal_common *common;
3676d1dd KM	64	struct thermal_zone_device *zone;
e0a5172e	65	struct delayed_work work;
b2bbc6a2	66	struct mutex lock;
3676d1dd	67	struct list_head list;
e0a5172e	68	int id;
913015c6	69	u32 ctemp;
1e426ffd KM	70	};
1e426ffd KM	71
3676d1dd KM	72	#define rcar_thermal_for_each_priv(pos, common) \
	73	list_for_each_entry(pos, &common->head, list)
	74
c499703e	75	#define MCELSIUS(temp) ((temp) * 1000)
9dde8f86	76	#define rcar_zone_to_priv(zone) ((zone)->devdata)
3676d1dd KM	77	#define rcar_priv_to_dev(priv) ((priv)->common->dev)
3676d1dd KM	78	#define rcar_has_irq_support(priv) ((priv)->common->base)
e0a5172e	79	#define rcar_id_to_shift(priv) ((priv)->id * 8)
64a411e8 KM	80	#define rcar_of_data(dev) ((unsigned long)of_device_get_match_data(dev))
64a411e8 KM	81	#define rcar_use_of_thermal(dev) (rcar_of_data(dev) == USE_OF_THERMAL)
e0a5172e	82
8b477ea5	83	#define USE_OF_THERMAL 1
ca1e4558 KM	84	static const struct of_device_id rcar_thermal_dt_ids[] = {
ca1e4558 KM	85	{ .compatible = "renesas,rcar-thermal", },
8b477ea5	86	{ .compatible = "renesas,rcar-gen2-thermal", .data = (void *)USE_OF_THERMAL },
ca1e4558 KM	87	{},
	88	};
	89	MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
	90
1e426ffd KM	91	/*
	92	* basic functions
	93	*/
e9137a58 KM	94	#define rcar_thermal_common_read(c, r) \
	95	_rcar_thermal_common_read(c, COMMON_ ##r)
	96	static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
	97	u32 reg)
	98	{
	99	return ioread32(common->base + reg);
	100	}
	101
	102	#define rcar_thermal_common_write(c, r, d) \
	103	_rcar_thermal_common_write(c, COMMON_ ##r, d)
	104	static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
	105	u32 reg, u32 data)
	106	{
	107	iowrite32(data, common->base + reg);
	108	}
	109
	110	#define rcar_thermal_common_bset(c, r, m, d) \
	111	_rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
	112	static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
	113	u32 reg, u32 mask, u32 data)
	114	{
	115	u32 val;
	116
	117	val = ioread32(common->base + reg);
	118	val &= ~mask;
	119	val \|= (data & mask);
	120	iowrite32(val, common->base + reg);
	121	}
e9137a58 KM	122
	123	#define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
	124	static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
1e426ffd	125	{
b2bbc6a2	126	return ioread32(priv->base + reg);
1e426ffd KM	127	}
1e426ffd KM	128
e9137a58 KM	129	#define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
	130	static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
	131	u32 reg, u32 data)
1e426ffd	132	{
1e426ffd	133	iowrite32(data, priv->base + reg);
1e426ffd	134	}
1e426ffd	135
e9137a58 KM	136	#define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
	137	static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
	138	u32 mask, u32 data)
1e426ffd	139	{
1e426ffd KM	140	u32 val;
1e426ffd KM	141
1e426ffd KM	142	val = ioread32(priv->base + reg);
	143	val &= ~mask;
	144	val \|= (data & mask);
	145	iowrite32(val, priv->base + reg);
1e426ffd KM	146	}
	147
	148	/*
	149	* zone device functions
	150	*/
e0a5172e	151	static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
1e426ffd	152	{
f8f53e18 KM	153	struct device *dev = rcar_priv_to_dev(priv);
f8f53e18 KM	154	int i;
913015c6	155	u32 ctemp, old, new;
f0e68fc3	156	int ret = -EINVAL;
f8f53e18	157
b2bbc6a2 KM	158	mutex_lock(&priv->lock);
b2bbc6a2 KM	159
f8f53e18 KM	160	/*
	161	* TSC decides a value of CPTAP automatically,
	162	* and this is the conditions which validate interrupt.
	163	*/
	164	rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
	165
	166	ctemp = 0;
	167	old = ~0;
	168	for (i = 0; i < 128; i++) {
1e426ffd KM	169	/*
	170	* we need to wait 300us after changing comparator offset
	171	* to get stable temperature.
	172	* see "Usage Notes" on datasheet
	173	*/
1e426ffd KM	174	udelay(300);
1e426ffd KM	175
f8f53e18 KM	176	new = rcar_thermal_read(priv, THSSR) & CTEMP;
	177	if (new == old) {
	178	ctemp = new;
1e426ffd KM	179	break;
1e426ffd KM	180	}
f8f53e18	181	old = new;
1e426ffd KM	182	}
1e426ffd KM	183
f8f53e18 KM	184	if (!ctemp) {
f8f53e18 KM	185	dev_err(dev, "thermal sensor was broken\n");
f0e68fc3	186	goto err_out_unlock;
f8f53e18 KM	187	}
f8f53e18 KM	188
e0a5172e KM	189	/*
	190	* enable IRQ
	191	*/
	192	if (rcar_has_irq_support(priv)) {
	193	rcar_thermal_write(priv, FILONOFF, 0);
	194
	195	/* enable Rising/Falling edge interrupt */
	196	rcar_thermal_write(priv, POSNEG, 0x1);
	197	rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) \|
	198	((ctemp - 1) << 0)));
	199	}
	200
	201	dev_dbg(dev, "thermal%d %d -> %d\n", priv->id, priv->ctemp, ctemp);
	202
	203	priv->ctemp = ctemp;
f0e68fc3 WY	204	ret = 0;
f0e68fc3 WY	205	err_out_unlock:
b2bbc6a2	206	mutex_unlock(&priv->lock);
f0e68fc3	207	return ret;
1e426ffd KM	208	}
1e426ffd KM	209
8b477ea5 KM	210	static int rcar_thermal_get_current_temp(struct rcar_thermal_priv *priv,
8b477ea5 KM	211	int *temp)
e0a5172e	212	{
5440c40b	213	int tmp;
a1ade565	214	int ret;
e0a5172e	215
a1ade565 KM	216	ret = rcar_thermal_update_temp(priv);
	217	if (ret < 0)
	218	return ret;
e0a5172e KM	219
e0a5172e KM	220	mutex_lock(&priv->lock);
5440c40b	221	tmp = MCELSIUS((priv->ctemp * 5) - 65);
e0a5172e KM	222	mutex_unlock(&priv->lock);
e0a5172e KM	223
5440c40b KM	224	if ((tmp < MCELSIUS(-45)) \|\| (tmp > MCELSIUS(125))) {
	225	struct device *dev = rcar_priv_to_dev(priv);
	226
	227	dev_err(dev, "it couldn't measure temperature correctly\n");
	228	return -EIO;
	229	}
	230
	231	*temp = tmp;
	232
e0a5172e KM	233	return 0;
	234	}
	235
8b477ea5 KM	236	static int rcar_thermal_of_get_temp(void data, int temp)
	237	{
	238	struct rcar_thermal_priv *priv = data;
	239
	240	return rcar_thermal_get_current_temp(priv, temp);
	241	}
	242
	243	static int rcar_thermal_get_temp(struct thermal_zone_device zone, int temp)
	244	{
	245	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
	246
	247	return rcar_thermal_get_current_temp(priv, temp);
	248	}
	249
d2a73e22 KM	250	static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
	251	int trip, enum thermal_trip_type *type)
	252	{
	253	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
3676d1dd	254	struct device *dev = rcar_priv_to_dev(priv);
d2a73e22 KM	255
	256	/* see rcar_thermal_get_temp() */
	257	switch (trip) {
	258	case 0: /* +90 <= temp */
	259	*type = THERMAL_TRIP_CRITICAL;
	260	break;
	261	default:
3676d1dd	262	dev_err(dev, "rcar driver trip error\n");
d2a73e22 KM	263	return -EINVAL;
	264	}
	265
	266	return 0;
	267	}
	268
	269	static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
17e8351a	270	int trip, int *temp)
d2a73e22 KM	271	{
d2a73e22 KM	272	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
3676d1dd	273	struct device *dev = rcar_priv_to_dev(priv);
d2a73e22 KM	274
	275	/* see rcar_thermal_get_temp() */
	276	switch (trip) {
	277	case 0: /* +90 <= temp */
	278	*temp = MCELSIUS(90);
	279	break;
	280	default:
3676d1dd	281	dev_err(dev, "rcar driver trip error\n");
d2a73e22 KM	282	return -EINVAL;
	283	}
	284
	285	return 0;
	286	}
	287
	288	static int rcar_thermal_notify(struct thermal_zone_device *zone,
	289	int trip, enum thermal_trip_type type)
	290	{
	291	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
3676d1dd	292	struct device *dev = rcar_priv_to_dev(priv);
d2a73e22 KM	293
	294	switch (type) {
	295	case THERMAL_TRIP_CRITICAL:
	296	/* FIXME */
3676d1dd	297	dev_warn(dev, "Thermal reached to critical temperature\n");
d2a73e22 KM	298	break;
	299	default:
	300	break;
	301	}
	302
	303	return 0;
	304	}
	305
8b477ea5 KM	306	static const struct thermal_zone_of_device_ops rcar_thermal_zone_of_ops = {
	307	.get_temp = rcar_thermal_of_get_temp,
	308	};
	309
1e426ffd	310	static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
d2a73e22 KM	311	.get_temp = rcar_thermal_get_temp,
	312	.get_trip_type = rcar_thermal_get_trip_type,
	313	.get_trip_temp = rcar_thermal_get_trip_temp,
	314	.notify = rcar_thermal_notify,
1e426ffd KM	315	};
1e426ffd KM	316
e0a5172e KM	317	/*
	318	* interrupt
	319	*/
	320	#define rcar_thermal_irq_enable(p) _rcar_thermal_irq_ctrl(p, 1)
	321	#define rcar_thermal_irq_disable(p) _rcar_thermal_irq_ctrl(p, 0)
	322	static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
	323	{
	324	struct rcar_thermal_common *common = priv->common;
	325	unsigned long flags;
	326	u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
	327
ffbcdf8a KM	328	if (!rcar_has_irq_support(priv))
	329	return;
	330
e0a5172e KM	331	spin_lock_irqsave(&common->lock, flags);
	332
	333	rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
	334
	335	spin_unlock_irqrestore(&common->lock, flags);
	336	}
	337
	338	static void rcar_thermal_work(struct work_struct *work)
	339	{
	340	struct rcar_thermal_priv *priv;
17e8351a	341	int cctemp, nctemp;
a1ade565	342	int ret;
e0a5172e KM	343
	344	priv = container_of(work, struct rcar_thermal_priv, work.work);
	345
8b477ea5 KM	346	ret = rcar_thermal_get_current_temp(priv, &cctemp);
	347	if (ret < 0)
	348	return;
	349
a1ade565 KM	350	ret = rcar_thermal_update_temp(priv);
	351	if (ret < 0)
	352	return;
	353
e0a5172e	354	rcar_thermal_irq_enable(priv);
9477165e	355
8b477ea5 KM	356	ret = rcar_thermal_get_current_temp(priv, &nctemp);
	357	if (ret < 0)
	358	return;
	359
9477165e	360	if (nctemp != cctemp)
0e70f466 SP	361	thermal_zone_device_update(priv->zone,
0e70f466 SP	362	THERMAL_EVENT_UNSPECIFIED);
e0a5172e KM	363	}
	364
	365	static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
	366	{
	367	struct device *dev = rcar_priv_to_dev(priv);
	368
	369	status = (status >> rcar_id_to_shift(priv)) & 0x3;
	370
206c0cba	371	if (status) {
e0a5172e KM	372	dev_dbg(dev, "thermal%d %s%s\n",
	373	priv->id,
	374	(status & 0x2) ? "Rising " : "",
	375	(status & 0x1) ? "Falling" : "");
	376	}
	377
	378	return status;
	379	}
	380
	381	static irqreturn_t rcar_thermal_irq(int irq, void *data)
	382	{
	383	struct rcar_thermal_common *common = data;
	384	struct rcar_thermal_priv *priv;
	385	unsigned long flags;
	386	u32 status, mask;
	387
	388	spin_lock_irqsave(&common->lock, flags);
	389
	390	mask = rcar_thermal_common_read(common, INTMSK);
	391	status = rcar_thermal_common_read(common, STR);
	392	rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
	393
	394	spin_unlock_irqrestore(&common->lock, flags);
	395
	396	status = status & ~mask;
	397
	398	/*
	399	* check the status
	400	*/
	401	rcar_thermal_for_each_priv(priv, common) {
	402	if (rcar_thermal_had_changed(priv, status)) {
	403	rcar_thermal_irq_disable(priv);
	404	schedule_delayed_work(&priv->work,
	405	msecs_to_jiffies(300));
	406	}
	407	}
	408
	409	return IRQ_HANDLED;
	410	}
	411
1e426ffd KM	412	/*
	413	* platform functions
	414	*/
84f0e490 KM	415	static int rcar_thermal_remove(struct platform_device *pdev)
	416	{
	417	struct rcar_thermal_common *common = platform_get_drvdata(pdev);
	418	struct device *dev = &pdev->dev;
	419	struct rcar_thermal_priv *priv;
	420
	421	rcar_thermal_for_each_priv(priv, common) {
ffbcdf8a	422	rcar_thermal_irq_disable(priv);
64a411e8 KM	423	if (rcar_use_of_thermal(dev))
64a411e8 KM	424	thermal_remove_hwmon_sysfs(priv->zone);
d4b23c5c BDP	425	else
d4b23c5c BDP	426	thermal_zone_device_unregister(priv->zone);
84f0e490 KM	427	}
	428
	429	pm_runtime_put(dev);
	430	pm_runtime_disable(dev);
	431
	432	return 0;
	433	}
	434
1e426ffd KM	435	static int rcar_thermal_probe(struct platform_device *pdev)
1e426ffd KM	436	{
3676d1dd	437	struct rcar_thermal_common *common;
1e426ffd	438	struct rcar_thermal_priv *priv;
3676d1dd KM	439	struct device *dev = &pdev->dev;
	440	struct resource res, irq;
	441	int mres = 0;
	442	int i;
fb84d990	443	int ret = -ENODEV;
e0a5172e	444	int idle = IDLE_INTERVAL;
11313746	445	u32 enr_bits = 0;
1e426ffd	446
3676d1dd	447	common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
b0a60d88	448	if (!common)
1e426ffd	449	return -ENOMEM;
1e426ffd	450
84f0e490 KM	451	platform_set_drvdata(pdev, common);
84f0e490 KM	452
3676d1dd	453	INIT_LIST_HEAD(&common->head);
e0a5172e	454	spin_lock_init(&common->lock);
3676d1dd KM	455	common->dev = dev;
3676d1dd KM	456
51d45d25 KM	457	pm_runtime_enable(dev);
	458	pm_runtime_get_sync(dev);
	459
3676d1dd KM	460	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	461	if (irq) {
	462	/*
	463	* platform has IRQ support.
ee853add	464	* Then, driver uses common registers
3676d1dd KM	465	* rcar_has_irq_support() will be enabled
3676d1dd KM	466	*/
c28f692c	467	res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
5095526f SK	468	common->base = devm_ioremap_resource(dev, res);
	469	if (IS_ERR(common->base))
	470	return PTR_ERR(common->base);
e0a5172e	471
6fe495e0	472	idle = 0; /* polling delay is not needed */
1e426ffd KM	473	}
1e426ffd KM	474
3676d1dd KM	475	for (i = 0;; i++) {
	476	res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
	477	if (!res)
	478	break;
	479
	480	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	481	if (!priv) {
1dc20828 KM	482	ret = -ENOMEM;
1dc20828 KM	483	goto error_unregister;
3676d1dd KM	484	}
3676d1dd KM	485
5095526f	486	priv->base = devm_ioremap_resource(dev, res);
1dc20828 KM	487	if (IS_ERR(priv->base)) {
	488	ret = PTR_ERR(priv->base);
	489	goto error_unregister;
	490	}
3676d1dd KM	491
3676d1dd KM	492	priv->common = common;
e0a5172e	493	priv->id = i;
3676d1dd KM	494	mutex_init(&priv->lock);
3676d1dd KM	495	INIT_LIST_HEAD(&priv->list);
e0a5172e	496	INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
a1ade565 KM	497	ret = rcar_thermal_update_temp(priv);
	498	if (ret < 0)
	499	goto error_unregister;
3676d1dd	500
64a411e8	501	if (rcar_use_of_thermal(dev))
5e325868	502	priv->zone = devm_thermal_zone_of_sensor_register(
8b477ea5 KM	503	dev, i, priv,
	504	&rcar_thermal_zone_of_ops);
	505	else
	506	priv->zone = thermal_zone_device_register(
	507	"rcar_thermal",
3676d1dd KM	508	1, 0, priv,
3676d1dd KM	509	&rcar_thermal_zone_ops, NULL, 0,
e0a5172e	510	idle);
3676d1dd KM	511	if (IS_ERR(priv->zone)) {
3676d1dd KM	512	dev_err(dev, "can't register thermal zone\n");
fb84d990	513	ret = PTR_ERR(priv->zone);
87260d3f	514	priv->zone = NULL;
3676d1dd KM	515	goto error_unregister;
	516	}
	517
64a411e8 KM	518	if (rcar_use_of_thermal(dev)) {
	519	/*
	520	* thermal_zone doesn't enable hwmon as default,
	521	* but, enable it here to keep compatible
	522	*/
	523	priv->zone->tzp->no_hwmon = false;
	524	ret = thermal_add_hwmon_sysfs(priv->zone);
	525	if (ret)
	526	goto error_unregister;
	527	}
	528
ffbcdf8a	529	rcar_thermal_irq_enable(priv);
1dc20828 KM	530
1dc20828 KM	531	list_move_tail(&priv->list, &common->head);
11313746 YS	532
	533	/* update ENR bits */
	534	enr_bits \|= 3 << (i * 8);
1e426ffd KM	535	}
1e426ffd KM	536
11313746	537	/* enable temperature comparation */
0b37a83a GU	538	if (irq) {
	539	ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
	540	dev_name(dev), common);
	541	if (ret) {
	542	dev_err(dev, "irq request failed\n ");
	543	goto error_unregister;
	544	}
	545
11313746	546	rcar_thermal_common_write(common, ENR, enr_bits);
0b37a83a	547	}
11313746	548
3db46c93	549	dev_info(dev, "%d sensor probed\n", i);
1e426ffd KM	550
1e426ffd KM	551	return 0;
3676d1dd KM	552
3676d1dd KM	553	error_unregister:
84f0e490	554	rcar_thermal_remove(pdev);
51d45d25	555
fb84d990	556	return ret;
1e426ffd KM	557	}
1e426ffd KM	558
1e426ffd KM	559	static struct platform_driver rcar_thermal_driver = {
	560	.driver = {
	561	.name = "rcar_thermal",
76cc1887	562	.of_match_table = rcar_thermal_dt_ids,
1e426ffd KM	563	},
	564	.probe = rcar_thermal_probe,
	565	.remove = rcar_thermal_remove,
	566	};
	567	module_platform_driver(rcar_thermal_driver);
	568
	569	MODULE_LICENSE("GPL");
	570	MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
	571	MODULE_AUTHOR("Kuninori Morimoto <[email protected]>");