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

/*
 *  R-Car THS/TSC thermal sensor driver
 *
 * Copyright (C) 2012 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.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; 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>

#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 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);
}

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);
		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;
	unsigned long of_data = (unsigned long)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);

	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 (of_data == USE_OF_THERMAL)
			priv->zone = 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);
			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 <kuninori.morimoto.gx@renesas.com>");
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 <kuninori.morimoto.gx@renesas.com>
	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
d2a73e22	34	#define IDLE_INTERVAL 5000
d2a73e22	35
e0a5172e KM	36	#define COMMON_STR 0x00
	37	#define COMMON_ENR 0x04
	38	#define COMMON_INTMSK 0x0c
	39
	40	#define REG_POSNEG 0x20
	41	#define REG_FILONOFF 0x28
e9137a58 KM	42	#define REG_THSCR 0x2c
e9137a58 KM	43	#define REG_THSSR 0x30
e0a5172e	44	#define REG_INTCTRL 0x34
1e426ffd KM	45
1e426ffd KM	46	/* THSCR */
f8f53e18	47	#define CPCTL (1 << 12)
1e426ffd KM	48
	49	/* THSSR */
	50	#define CTEMP 0x3f
	51
3676d1dd KM	52	struct rcar_thermal_common {
	53	void __iomem *base;
	54	struct device *dev;
	55	struct list_head head;
e0a5172e	56	spinlock_t lock;
3676d1dd	57	};
1e426ffd KM	58
	59	struct rcar_thermal_priv {
	60	void __iomem *base;
3676d1dd KM	61	struct rcar_thermal_common *common;
3676d1dd KM	62	struct thermal_zone_device *zone;
e0a5172e	63	struct delayed_work work;
b2bbc6a2	64	struct mutex lock;
3676d1dd	65	struct list_head list;
e0a5172e	66	int id;
913015c6	67	u32 ctemp;
1e426ffd KM	68	};
1e426ffd KM	69
3676d1dd KM	70	#define rcar_thermal_for_each_priv(pos, common) \
	71	list_for_each_entry(pos, &common->head, list)
	72
c499703e	73	#define MCELSIUS(temp) ((temp) * 1000)
9dde8f86	74	#define rcar_zone_to_priv(zone) ((zone)->devdata)
3676d1dd KM	75	#define rcar_priv_to_dev(priv) ((priv)->common->dev)
3676d1dd KM	76	#define rcar_has_irq_support(priv) ((priv)->common->base)
e0a5172e KM	77	#define rcar_id_to_shift(priv) ((priv)->id * 8)
e0a5172e KM	78
8b477ea5	79	#define USE_OF_THERMAL 1
ca1e4558 KM	80	static const struct of_device_id rcar_thermal_dt_ids[] = {
ca1e4558 KM	81	{ .compatible = "renesas,rcar-thermal", },
8b477ea5	82	{ .compatible = "renesas,rcar-gen2-thermal", .data = (void *)USE_OF_THERMAL },
ca1e4558 KM	83	{},
	84	};
	85	MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
	86
1e426ffd KM	87	/*
	88	* basic functions
	89	*/
e9137a58 KM	90	#define rcar_thermal_common_read(c, r) \
	91	_rcar_thermal_common_read(c, COMMON_ ##r)
	92	static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
	93	u32 reg)
	94	{
	95	return ioread32(common->base + reg);
	96	}
	97
	98	#define rcar_thermal_common_write(c, r, d) \
	99	_rcar_thermal_common_write(c, COMMON_ ##r, d)
	100	static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
	101	u32 reg, u32 data)
	102	{
	103	iowrite32(data, common->base + reg);
	104	}
	105
	106	#define rcar_thermal_common_bset(c, r, m, d) \
	107	_rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
	108	static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
	109	u32 reg, u32 mask, u32 data)
	110	{
	111	u32 val;
	112
	113	val = ioread32(common->base + reg);
	114	val &= ~mask;
	115	val \|= (data & mask);
	116	iowrite32(val, common->base + reg);
	117	}
e9137a58 KM	118
	119	#define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
	120	static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
1e426ffd	121	{
b2bbc6a2	122	return ioread32(priv->base + reg);
1e426ffd KM	123	}
1e426ffd KM	124
e9137a58 KM	125	#define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
	126	static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
	127	u32 reg, u32 data)
1e426ffd	128	{
1e426ffd	129	iowrite32(data, priv->base + reg);
1e426ffd	130	}
1e426ffd	131
e9137a58 KM	132	#define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
	133	static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
	134	u32 mask, u32 data)
1e426ffd	135	{
1e426ffd KM	136	u32 val;
1e426ffd KM	137
1e426ffd KM	138	val = ioread32(priv->base + reg);
	139	val &= ~mask;
	140	val \|= (data & mask);
	141	iowrite32(val, priv->base + reg);
1e426ffd KM	142	}
	143
	144	/*
	145	* zone device functions
	146	*/
e0a5172e	147	static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
1e426ffd	148	{
f8f53e18 KM	149	struct device *dev = rcar_priv_to_dev(priv);
f8f53e18 KM	150	int i;
913015c6	151	u32 ctemp, old, new;
f0e68fc3	152	int ret = -EINVAL;
f8f53e18	153
b2bbc6a2 KM	154	mutex_lock(&priv->lock);
b2bbc6a2 KM	155
f8f53e18 KM	156	/*
	157	* TSC decides a value of CPTAP automatically,
	158	* and this is the conditions which validate interrupt.
	159	*/
	160	rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
	161
	162	ctemp = 0;
	163	old = ~0;
	164	for (i = 0; i < 128; i++) {
1e426ffd KM	165	/*
	166	* we need to wait 300us after changing comparator offset
	167	* to get stable temperature.
	168	* see "Usage Notes" on datasheet
	169	*/
1e426ffd KM	170	udelay(300);
1e426ffd KM	171
f8f53e18 KM	172	new = rcar_thermal_read(priv, THSSR) & CTEMP;
	173	if (new == old) {
	174	ctemp = new;
1e426ffd KM	175	break;
1e426ffd KM	176	}
f8f53e18	177	old = new;
1e426ffd KM	178	}
1e426ffd KM	179
f8f53e18 KM	180	if (!ctemp) {
f8f53e18 KM	181	dev_err(dev, "thermal sensor was broken\n");
f0e68fc3	182	goto err_out_unlock;
f8f53e18 KM	183	}
f8f53e18 KM	184
e0a5172e KM	185	/*
	186	* enable IRQ
	187	*/
	188	if (rcar_has_irq_support(priv)) {
	189	rcar_thermal_write(priv, FILONOFF, 0);
	190
	191	/* enable Rising/Falling edge interrupt */
	192	rcar_thermal_write(priv, POSNEG, 0x1);
	193	rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) \|
	194	((ctemp - 1) << 0)));
	195	}
	196
	197	dev_dbg(dev, "thermal%d %d -> %d\n", priv->id, priv->ctemp, ctemp);
	198
	199	priv->ctemp = ctemp;
f0e68fc3 WY	200	ret = 0;
f0e68fc3 WY	201	err_out_unlock:
b2bbc6a2	202	mutex_unlock(&priv->lock);
f0e68fc3	203	return ret;
1e426ffd KM	204	}
1e426ffd KM	205
8b477ea5 KM	206	static int rcar_thermal_get_current_temp(struct rcar_thermal_priv *priv,
8b477ea5 KM	207	int *temp)
e0a5172e	208	{
5440c40b	209	int tmp;
a1ade565	210	int ret;
e0a5172e	211
a1ade565 KM	212	ret = rcar_thermal_update_temp(priv);
	213	if (ret < 0)
	214	return ret;
e0a5172e KM	215
e0a5172e KM	216	mutex_lock(&priv->lock);
5440c40b	217	tmp = MCELSIUS((priv->ctemp * 5) - 65);
e0a5172e KM	218	mutex_unlock(&priv->lock);
e0a5172e KM	219
5440c40b KM	220	if ((tmp < MCELSIUS(-45)) \|\| (tmp > MCELSIUS(125))) {
	221	struct device *dev = rcar_priv_to_dev(priv);
	222
	223	dev_err(dev, "it couldn't measure temperature correctly\n");
	224	return -EIO;
	225	}
	226
	227	*temp = tmp;
	228
e0a5172e KM	229	return 0;
	230	}
	231
8b477ea5 KM	232	static int rcar_thermal_of_get_temp(void data, int temp)
	233	{
	234	struct rcar_thermal_priv *priv = data;
	235
	236	return rcar_thermal_get_current_temp(priv, temp);
	237	}
	238
	239	static int rcar_thermal_get_temp(struct thermal_zone_device zone, int temp)
	240	{
	241	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
	242
	243	return rcar_thermal_get_current_temp(priv, temp);
	244	}
	245
d2a73e22	246	static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
	247	int trip, enum thermal_trip_type *type)
	248	{
	249	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
3676d1dd	250	struct device *dev = rcar_priv_to_dev(priv);
d2a73e22	251
	252	/* see rcar_thermal_get_temp() */
	253	switch (trip) {
	254	case 0: /* +90 <= temp */
	255	*type = THERMAL_TRIP_CRITICAL;
	256	break;
	257	default:
3676d1dd	258	dev_err(dev, "rcar driver trip error\n");
d2a73e22	259	return -EINVAL;
	260	}
	261
	262	return 0;
	263	}
	264
	265	static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
17e8351a	266	int trip, int *temp)
d2a73e22	267	{
d2a73e22	268	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
3676d1dd	269	struct device *dev = rcar_priv_to_dev(priv);
d2a73e22	270
	271	/* see rcar_thermal_get_temp() */
	272	switch (trip) {
	273	case 0: /* +90 <= temp */
	274	*temp = MCELSIUS(90);
	275	break;
	276	default:
3676d1dd	277	dev_err(dev, "rcar driver trip error\n");
d2a73e22	278	return -EINVAL;
	279	}
	280
	281	return 0;
	282	}
	283
	284	static int rcar_thermal_notify(struct thermal_zone_device *zone,
	285	int trip, enum thermal_trip_type type)
	286	{
	287	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
3676d1dd	288	struct device *dev = rcar_priv_to_dev(priv);
d2a73e22	289
	290	switch (type) {
	291	case THERMAL_TRIP_CRITICAL:
	292	/* FIXME */
3676d1dd	293	dev_warn(dev, "Thermal reached to critical temperature\n");
d2a73e22	294	break;
	295	default:
	296	break;
	297	}
	298
	299	return 0;
	300	}
	301
8b477ea5 KM	302	static const struct thermal_zone_of_device_ops rcar_thermal_zone_of_ops = {
	303	.get_temp = rcar_thermal_of_get_temp,
	304	};
	305
1e426ffd	306	static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
d2a73e22	307	.get_temp = rcar_thermal_get_temp,
	308	.get_trip_type = rcar_thermal_get_trip_type,
	309	.get_trip_temp = rcar_thermal_get_trip_temp,
	310	.notify = rcar_thermal_notify,
1e426ffd KM	311	};
1e426ffd KM	312
e0a5172e KM	313	/*
	314	* interrupt
	315	*/
	316	#define rcar_thermal_irq_enable(p) _rcar_thermal_irq_ctrl(p, 1)
	317	#define rcar_thermal_irq_disable(p) _rcar_thermal_irq_ctrl(p, 0)
	318	static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
	319	{
	320	struct rcar_thermal_common *common = priv->common;
	321	unsigned long flags;
	322	u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
	323
ffbcdf8a KM	324	if (!rcar_has_irq_support(priv))
	325	return;
	326
e0a5172e KM	327	spin_lock_irqsave(&common->lock, flags);
	328
	329	rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
	330
	331	spin_unlock_irqrestore(&common->lock, flags);
	332	}
	333
	334	static void rcar_thermal_work(struct work_struct *work)
	335	{
	336	struct rcar_thermal_priv *priv;
17e8351a	337	int cctemp, nctemp;
a1ade565	338	int ret;
e0a5172e KM	339
	340	priv = container_of(work, struct rcar_thermal_priv, work.work);
	341
8b477ea5 KM	342	ret = rcar_thermal_get_current_temp(priv, &cctemp);
	343	if (ret < 0)
	344	return;
	345
a1ade565 KM	346	ret = rcar_thermal_update_temp(priv);
	347	if (ret < 0)
	348	return;
	349
e0a5172e	350	rcar_thermal_irq_enable(priv);
9477165e	351
8b477ea5 KM	352	ret = rcar_thermal_get_current_temp(priv, &nctemp);
	353	if (ret < 0)
	354	return;
	355
9477165e PT	356	if (nctemp != cctemp)
9477165e PT	357	thermal_zone_device_update(priv->zone);
e0a5172e KM	358	}
	359
	360	static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
	361	{
	362	struct device *dev = rcar_priv_to_dev(priv);
	363
	364	status = (status >> rcar_id_to_shift(priv)) & 0x3;
	365
206c0cba	366	if (status) {
e0a5172e KM	367	dev_dbg(dev, "thermal%d %s%s\n",
	368	priv->id,
	369	(status & 0x2) ? "Rising " : "",
	370	(status & 0x1) ? "Falling" : "");
	371	}
	372
	373	return status;
	374	}
	375
	376	static irqreturn_t rcar_thermal_irq(int irq, void *data)
	377	{
	378	struct rcar_thermal_common *common = data;
	379	struct rcar_thermal_priv *priv;
	380	unsigned long flags;
	381	u32 status, mask;
	382
	383	spin_lock_irqsave(&common->lock, flags);
	384
	385	mask = rcar_thermal_common_read(common, INTMSK);
	386	status = rcar_thermal_common_read(common, STR);
	387	rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
	388
	389	spin_unlock_irqrestore(&common->lock, flags);
	390
	391	status = status & ~mask;
	392
	393	/*
	394	* check the status
	395	*/
	396	rcar_thermal_for_each_priv(priv, common) {
	397	if (rcar_thermal_had_changed(priv, status)) {
	398	rcar_thermal_irq_disable(priv);
	399	schedule_delayed_work(&priv->work,
	400	msecs_to_jiffies(300));
	401	}
	402	}
	403
	404	return IRQ_HANDLED;
	405	}
	406
1e426ffd KM	407	/*
	408	* platform functions
	409	*/
84f0e490 KM	410	static int rcar_thermal_remove(struct platform_device *pdev)
	411	{
	412	struct rcar_thermal_common *common = platform_get_drvdata(pdev);
	413	struct device *dev = &pdev->dev;
	414	struct rcar_thermal_priv *priv;
	415
	416	rcar_thermal_for_each_priv(priv, common) {
ffbcdf8a	417	rcar_thermal_irq_disable(priv);
84f0e490 KM	418	thermal_zone_device_unregister(priv->zone);
	419	}
	420
	421	pm_runtime_put(dev);
	422	pm_runtime_disable(dev);
	423
	424	return 0;
	425	}
	426
1e426ffd KM	427	static int rcar_thermal_probe(struct platform_device *pdev)
1e426ffd KM	428	{
3676d1dd	429	struct rcar_thermal_common *common;
1e426ffd	430	struct rcar_thermal_priv *priv;
3676d1dd KM	431	struct device *dev = &pdev->dev;
3676d1dd KM	432	struct resource res, irq;
67bc3f42	433	unsigned long of_data = (unsigned long)of_device_get_match_data(dev);
3676d1dd KM	434	int mres = 0;
3676d1dd KM	435	int i;
fb84d990	436	int ret = -ENODEV;
e0a5172e	437	int idle = IDLE_INTERVAL;
11313746	438	u32 enr_bits = 0;
1e426ffd	439
3676d1dd	440	common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
b0a60d88	441	if (!common)
1e426ffd	442	return -ENOMEM;
1e426ffd	443
84f0e490 KM	444	platform_set_drvdata(pdev, common);
84f0e490 KM	445
3676d1dd	446	INIT_LIST_HEAD(&common->head);
e0a5172e	447	spin_lock_init(&common->lock);
3676d1dd KM	448	common->dev = dev;
3676d1dd KM	449
51d45d25 KM	450	pm_runtime_enable(dev);
	451	pm_runtime_get_sync(dev);
	452
3676d1dd KM	453	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	454	if (irq) {
	455	/*
	456	* platform has IRQ support.
ee853add	457	* Then, driver uses common registers
3676d1dd KM	458	* rcar_has_irq_support() will be enabled
3676d1dd KM	459	*/
c28f692c	460	res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
5095526f SK	461	common->base = devm_ioremap_resource(dev, res);
	462	if (IS_ERR(common->base))
	463	return PTR_ERR(common->base);
e0a5172e	464
6fe495e0	465	idle = 0; /* polling delay is not needed */
1e426ffd KM	466	}
1e426ffd KM	467
3676d1dd KM	468	for (i = 0;; i++) {
	469	res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
	470	if (!res)
	471	break;
	472
	473	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	474	if (!priv) {
1dc20828 KM	475	ret = -ENOMEM;
1dc20828 KM	476	goto error_unregister;
3676d1dd KM	477	}
3676d1dd KM	478
5095526f	479	priv->base = devm_ioremap_resource(dev, res);
1dc20828 KM	480	if (IS_ERR(priv->base)) {
	481	ret = PTR_ERR(priv->base);
	482	goto error_unregister;
	483	}
3676d1dd KM	484
3676d1dd KM	485	priv->common = common;
e0a5172e	486	priv->id = i;
3676d1dd KM	487	mutex_init(&priv->lock);
3676d1dd KM	488	INIT_LIST_HEAD(&priv->list);
e0a5172e	489	INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
a1ade565 KM	490	ret = rcar_thermal_update_temp(priv);
	491	if (ret < 0)
	492	goto error_unregister;
3676d1dd	493
8b477ea5 KM	494	if (of_data == USE_OF_THERMAL)
	495	priv->zone = thermal_zone_of_sensor_register(
	496	dev, i, priv,
	497	&rcar_thermal_zone_of_ops);
	498	else
	499	priv->zone = thermal_zone_device_register(
	500	"rcar_thermal",
3676d1dd KM	501	1, 0, priv,
3676d1dd KM	502	&rcar_thermal_zone_ops, NULL, 0,
e0a5172e	503	idle);
3676d1dd KM	504	if (IS_ERR(priv->zone)) {
3676d1dd KM	505	dev_err(dev, "can't register thermal zone\n");
fb84d990	506	ret = PTR_ERR(priv->zone);
3676d1dd KM	507	goto error_unregister;
	508	}
	509
ffbcdf8a	510	rcar_thermal_irq_enable(priv);
1dc20828 KM	511
1dc20828 KM	512	list_move_tail(&priv->list, &common->head);
11313746 YS	513
	514	/* update ENR bits */
	515	enr_bits \|= 3 << (i * 8);
1e426ffd KM	516	}
1e426ffd KM	517
11313746	518	/* enable temperature comparation */
0b37a83a GU	519	if (irq) {
	520	ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
	521	dev_name(dev), common);
	522	if (ret) {
	523	dev_err(dev, "irq request failed\n ");
	524	goto error_unregister;
	525	}
	526
11313746	527	rcar_thermal_common_write(common, ENR, enr_bits);
0b37a83a	528	}
11313746	529
3db46c93	530	dev_info(dev, "%d sensor probed\n", i);
1e426ffd KM	531
1e426ffd KM	532	return 0;
3676d1dd KM	533
3676d1dd KM	534	error_unregister:
84f0e490	535	rcar_thermal_remove(pdev);
51d45d25	536
fb84d990	537	return ret;
1e426ffd KM	538	}
1e426ffd KM	539
1e426ffd KM	540	static struct platform_driver rcar_thermal_driver = {
	541	.driver = {
	542	.name = "rcar_thermal",
76cc1887	543	.of_match_table = rcar_thermal_dt_ids,
1e426ffd KM	544	},
	545	.probe = rcar_thermal_probe,
	546	.remove = rcar_thermal_remove,
	547	};
	548	module_platform_driver(rcar_thermal_driver);
	549
	550	MODULE_LICENSE("GPL");
	551	MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
	552	MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");