[mirror_ubuntu-artful-kernel.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/platform_device.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;
	int 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)

#ifdef DEBUG
# define rcar_force_update_temp(priv)	1
#else
# define rcar_force_update_temp(priv)	0
#endif

/*
 *		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;
	int ctemp, old, new;

	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");
		return -EINVAL;
	}

	/*
	 * 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;

	mutex_unlock(&priv->lock);

	return 0;
}

static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
				 unsigned long *temp)
{
	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);

	if (!rcar_has_irq_support(priv) || rcar_force_update_temp(priv))
		rcar_thermal_update_temp(priv);

	mutex_lock(&priv->lock);
	*temp =  MCELSIUS((priv->ctemp * 5) - 65);
	mutex_unlock(&priv->lock);

	return 0;
}

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, unsigned long *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 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 */

	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;

	priv = container_of(work, struct rcar_thermal_priv, work.work);

	rcar_thermal_update_temp(priv);
	rcar_thermal_irq_enable(priv);
	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 & 0x3) {
		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_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 idle = IDLE_INTERVAL;

	common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
	if (!common) {
		dev_err(dev, "Could not allocate common\n");
		return -ENOMEM;
	}

	INIT_LIST_HEAD(&common->head);
	spin_lock_init(&common->lock);
	common->dev = dev;

	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (irq) {
		int ret;

		/*
		 * platform has IRQ support.
		 * Then, drier use common register
		 */
		res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
		if (!res) {
			dev_err(dev, "Could not get platform resource\n");
			return -ENODEV;
		}

		ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
				       dev_name(dev), common);
		if (ret) {
			dev_err(dev, "irq request failed\n ");
			return ret;
		}

		/*
		 * rcar_has_irq_support() will be enabled
		 */
		common->base = devm_request_and_ioremap(dev, res);
		if (!common->base) {
			dev_err(dev, "Unable to ioremap thermal register\n");
			return -ENOMEM;
		}

		/* enable temperature comparation */
		rcar_thermal_common_write(common, ENR, 0x00030303);

		idle = 0; /* polling delaye 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) {
			dev_err(dev, "Could not allocate priv\n");
			return -ENOMEM;
		}

		priv->base = devm_request_and_ioremap(dev, res);
		if (!priv->base) {
			dev_err(dev, "Unable to ioremap priv register\n");
			return -ENOMEM;
		}

		priv->common = common;
		priv->id = i;
		mutex_init(&priv->lock);
		INIT_LIST_HEAD(&priv->list);
		INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
		rcar_thermal_update_temp(priv);

		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");
			goto error_unregister;
		}

		list_move_tail(&priv->list, &common->head);

		if (rcar_has_irq_support(priv))
			rcar_thermal_irq_enable(priv);
	}

	platform_set_drvdata(pdev, common);

	dev_info(dev, "%d sensor proved\n", i);

	return 0;

error_unregister:
	rcar_thermal_for_each_priv(priv, common)
		thermal_zone_device_unregister(priv->zone);

	return -ENODEV;
}

static int rcar_thermal_remove(struct platform_device *pdev)
{
	struct rcar_thermal_common *common = platform_get_drvdata(pdev);
	struct rcar_thermal_priv *priv;

	rcar_thermal_for_each_priv(priv, common)
		thermal_zone_device_unregister(priv->zone);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static const struct of_device_id rcar_thermal_dt_ids[] __devinitconst = {
	{ .compatible = "renesas,rcar-thermal", },
	{},
};
MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);

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>
	25	#include <linux/module.h>
	26	#include <linux/platform_device.h>
d2a73e22	27	#include <linux/reboot.h>
1e426ffd KM	28	#include <linux/slab.h>
	29	#include <linux/spinlock.h>
	30	#include <linux/thermal.h>
	31
d2a73e22 KM	32	#define IDLE_INTERVAL 5000
d2a73e22 KM	33
e0a5172e KM	34	#define COMMON_STR 0x00
	35	#define COMMON_ENR 0x04
	36	#define COMMON_INTMSK 0x0c
	37
	38	#define REG_POSNEG 0x20
	39	#define REG_FILONOFF 0x28
e9137a58 KM	40	#define REG_THSCR 0x2c
e9137a58 KM	41	#define REG_THSSR 0x30
e0a5172e	42	#define REG_INTCTRL 0x34
1e426ffd KM	43
1e426ffd KM	44	/* THSCR */
f8f53e18	45	#define CPCTL (1 << 12)
1e426ffd KM	46
	47	/* THSSR */
	48	#define CTEMP 0x3f
	49
3676d1dd KM	50	struct rcar_thermal_common {
	51	void __iomem *base;
	52	struct device *dev;
	53	struct list_head head;
e0a5172e	54	spinlock_t lock;
3676d1dd	55	};
1e426ffd KM	56
	57	struct rcar_thermal_priv {
	58	void __iomem *base;
3676d1dd KM	59	struct rcar_thermal_common *common;
3676d1dd KM	60	struct thermal_zone_device *zone;
e0a5172e	61	struct delayed_work work;
b2bbc6a2	62	struct mutex lock;
3676d1dd	63	struct list_head list;
e0a5172e KM	64	int id;
e0a5172e KM	65	int ctemp;
1e426ffd KM	66	};
1e426ffd KM	67
3676d1dd KM	68	#define rcar_thermal_for_each_priv(pos, common) \
	69	list_for_each_entry(pos, &common->head, list)
	70
c499703e	71	#define MCELSIUS(temp) ((temp) * 1000)
9dde8f86	72	#define rcar_zone_to_priv(zone) ((zone)->devdata)
3676d1dd KM	73	#define rcar_priv_to_dev(priv) ((priv)->common->dev)
3676d1dd KM	74	#define rcar_has_irq_support(priv) ((priv)->common->base)
e0a5172e KM	75	#define rcar_id_to_shift(priv) ((priv)->id * 8)
	76
	77	#ifdef DEBUG
	78	# define rcar_force_update_temp(priv) 1
	79	#else
	80	# define rcar_force_update_temp(priv) 0
	81	#endif
c499703e	82
1e426ffd KM	83	/*
	84	* basic functions
	85	*/
e9137a58 KM	86	#define rcar_thermal_common_read(c, r) \
	87	_rcar_thermal_common_read(c, COMMON_ ##r)
	88	static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
	89	u32 reg)
	90	{
	91	return ioread32(common->base + reg);
	92	}
	93
	94	#define rcar_thermal_common_write(c, r, d) \
	95	_rcar_thermal_common_write(c, COMMON_ ##r, d)
	96	static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
	97	u32 reg, u32 data)
	98	{
	99	iowrite32(data, common->base + reg);
	100	}
	101
	102	#define rcar_thermal_common_bset(c, r, m, d) \
	103	_rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
	104	static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
	105	u32 reg, u32 mask, u32 data)
	106	{
	107	u32 val;
	108
	109	val = ioread32(common->base + reg);
	110	val &= ~mask;
	111	val \|= (data & mask);
	112	iowrite32(val, common->base + reg);
	113	}
e9137a58 KM	114
	115	#define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
	116	static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
1e426ffd	117	{
b2bbc6a2	118	return ioread32(priv->base + reg);
1e426ffd KM	119	}
1e426ffd KM	120
e9137a58 KM	121	#define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
	122	static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
	123	u32 reg, u32 data)
1e426ffd	124	{
1e426ffd	125	iowrite32(data, priv->base + reg);
1e426ffd	126	}
1e426ffd	127
e9137a58 KM	128	#define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
	129	static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
	130	u32 mask, u32 data)
1e426ffd	131	{
1e426ffd KM	132	u32 val;
1e426ffd KM	133
1e426ffd KM	134	val = ioread32(priv->base + reg);
	135	val &= ~mask;
	136	val \|= (data & mask);
	137	iowrite32(val, priv->base + reg);
1e426ffd KM	138	}
	139
	140	/*
	141	* zone device functions
	142	*/
e0a5172e	143	static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
1e426ffd	144	{
f8f53e18 KM	145	struct device *dev = rcar_priv_to_dev(priv);
	146	int i;
	147	int ctemp, old, new;
	148
b2bbc6a2 KM	149	mutex_lock(&priv->lock);
b2bbc6a2 KM	150
f8f53e18 KM	151	/*
	152	* TSC decides a value of CPTAP automatically,
	153	* and this is the conditions which validate interrupt.
	154	*/
	155	rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
	156
	157	ctemp = 0;
	158	old = ~0;
	159	for (i = 0; i < 128; i++) {
1e426ffd KM	160	/*
	161	* we need to wait 300us after changing comparator offset
	162	* to get stable temperature.
	163	* see "Usage Notes" on datasheet
	164	*/
1e426ffd KM	165	udelay(300);
1e426ffd KM	166
f8f53e18 KM	167	new = rcar_thermal_read(priv, THSSR) & CTEMP;
	168	if (new == old) {
	169	ctemp = new;
1e426ffd KM	170	break;
1e426ffd KM	171	}
f8f53e18	172	old = new;
1e426ffd KM	173	}
1e426ffd KM	174
f8f53e18 KM	175	if (!ctemp) {
	176	dev_err(dev, "thermal sensor was broken\n");
	177	return -EINVAL;
	178	}
	179
e0a5172e KM	180	/*
	181	* enable IRQ
	182	*/
	183	if (rcar_has_irq_support(priv)) {
	184	rcar_thermal_write(priv, FILONOFF, 0);
	185
	186	/* enable Rising/Falling edge interrupt */
	187	rcar_thermal_write(priv, POSNEG, 0x1);
	188	rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) \|
	189	((ctemp - 1) << 0)));
	190	}
	191
	192	dev_dbg(dev, "thermal%d %d -> %d\n", priv->id, priv->ctemp, ctemp);
	193
	194	priv->ctemp = ctemp;
f8f53e18	195
b2bbc6a2 KM	196	mutex_unlock(&priv->lock);
b2bbc6a2 KM	197
1e426ffd KM	198	return 0;
	199	}
	200
e0a5172e KM	201	static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
	202	unsigned long *temp)
	203	{
	204	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
	205
	206	if (!rcar_has_irq_support(priv) \|\| rcar_force_update_temp(priv))
	207	rcar_thermal_update_temp(priv);
	208
	209	mutex_lock(&priv->lock);
	210	temp = MCELSIUS((priv->ctemp 5) - 65);
	211	mutex_unlock(&priv->lock);
	212
	213	return 0;
	214	}
	215
d2a73e22 KM	216	static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
	217	int trip, enum thermal_trip_type *type)
	218	{
	219	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
3676d1dd	220	struct device *dev = rcar_priv_to_dev(priv);
d2a73e22 KM	221
	222	/* see rcar_thermal_get_temp() */
	223	switch (trip) {
	224	case 0: /* +90 <= temp */
	225	*type = THERMAL_TRIP_CRITICAL;
	226	break;
	227	default:
3676d1dd	228	dev_err(dev, "rcar driver trip error\n");
d2a73e22 KM	229	return -EINVAL;
	230	}
	231
	232	return 0;
	233	}
	234
	235	static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
	236	int trip, unsigned long *temp)
	237	{
	238	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
3676d1dd	239	struct device *dev = rcar_priv_to_dev(priv);
d2a73e22 KM	240
	241	/* see rcar_thermal_get_temp() */
	242	switch (trip) {
	243	case 0: /* +90 <= temp */
	244	*temp = MCELSIUS(90);
	245	break;
	246	default:
3676d1dd	247	dev_err(dev, "rcar driver trip error\n");
d2a73e22 KM	248	return -EINVAL;
	249	}
	250
	251	return 0;
	252	}
	253
	254	static int rcar_thermal_notify(struct thermal_zone_device *zone,
	255	int trip, enum thermal_trip_type type)
	256	{
	257	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
3676d1dd	258	struct device *dev = rcar_priv_to_dev(priv);
d2a73e22 KM	259
	260	switch (type) {
	261	case THERMAL_TRIP_CRITICAL:
	262	/* FIXME */
3676d1dd	263	dev_warn(dev, "Thermal reached to critical temperature\n");
d2a73e22 KM	264	break;
	265	default:
	266	break;
	267	}
	268
	269	return 0;
	270	}
	271
1e426ffd	272	static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
d2a73e22 KM	273	.get_temp = rcar_thermal_get_temp,
	274	.get_trip_type = rcar_thermal_get_trip_type,
	275	.get_trip_temp = rcar_thermal_get_trip_temp,
	276	.notify = rcar_thermal_notify,
1e426ffd KM	277	};
1e426ffd KM	278
e0a5172e KM	279	/*
	280	* interrupt
	281	*/
	282	#define rcar_thermal_irq_enable(p) _rcar_thermal_irq_ctrl(p, 1)
	283	#define rcar_thermal_irq_disable(p) _rcar_thermal_irq_ctrl(p, 0)
	284	static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
	285	{
	286	struct rcar_thermal_common *common = priv->common;
	287	unsigned long flags;
	288	u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
	289
	290	spin_lock_irqsave(&common->lock, flags);
	291
	292	rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
	293
	294	spin_unlock_irqrestore(&common->lock, flags);
	295	}
	296
	297	static void rcar_thermal_work(struct work_struct *work)
	298	{
	299	struct rcar_thermal_priv *priv;
	300
	301	priv = container_of(work, struct rcar_thermal_priv, work.work);
	302
	303	rcar_thermal_update_temp(priv);
	304	rcar_thermal_irq_enable(priv);
	305	thermal_zone_device_update(priv->zone);
	306	}
	307
	308	static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
	309	{
	310	struct device *dev = rcar_priv_to_dev(priv);
	311
	312	status = (status >> rcar_id_to_shift(priv)) & 0x3;
	313
	314	if (status & 0x3) {
	315	dev_dbg(dev, "thermal%d %s%s\n",
	316	priv->id,
	317	(status & 0x2) ? "Rising " : "",
	318	(status & 0x1) ? "Falling" : "");
	319	}
	320
	321	return status;
	322	}
	323
	324	static irqreturn_t rcar_thermal_irq(int irq, void *data)
	325	{
	326	struct rcar_thermal_common *common = data;
	327	struct rcar_thermal_priv *priv;
	328	unsigned long flags;
	329	u32 status, mask;
	330
	331	spin_lock_irqsave(&common->lock, flags);
	332
	333	mask = rcar_thermal_common_read(common, INTMSK);
	334	status = rcar_thermal_common_read(common, STR);
	335	rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
	336
	337	spin_unlock_irqrestore(&common->lock, flags);
	338
	339	status = status & ~mask;
	340
	341	/*
	342	* check the status
343	*/
344	rcar_thermal_for_each_priv(priv, common) {
345	if (rcar_thermal_had_changed(priv, status)) {
346	rcar_thermal_irq_disable(priv);
347	schedule_delayed_work(&priv->work,
348	msecs_to_jiffies(300));
349	}
350	}
351
352	return IRQ_HANDLED;
353	}
354
1e426ffd KM	355	/*
	356	* platform functions
	357	*/
	358	static int rcar_thermal_probe(struct platform_device *pdev)
	359	{
3676d1dd	360	struct rcar_thermal_common *common;
1e426ffd	361	struct rcar_thermal_priv *priv;
3676d1dd KM	362	struct device *dev = &pdev->dev;
	363	struct resource res, irq;
	364	int mres = 0;
	365	int i;
e0a5172e	366	int idle = IDLE_INTERVAL;
1e426ffd	367
3676d1dd KM	368	common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
	369	if (!common) {
	370	dev_err(dev, "Could not allocate common\n");
1e426ffd KM	371	return -ENOMEM;
	372	}
	373
3676d1dd	374	INIT_LIST_HEAD(&common->head);
e0a5172e	375	spin_lock_init(&common->lock);
3676d1dd KM	376	common->dev = dev;
	377
	378	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	379	if (irq) {
e0a5172e KM	380	int ret;
e0a5172e KM	381
3676d1dd KM	382	/*
	383	* platform has IRQ support.
	384	* Then, drier use common register
	385	*/
	386	res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
	387	if (!res) {
	388	dev_err(dev, "Could not get platform resource\n");
	389	return -ENODEV;
	390	}
	391
e0a5172e KM	392	ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
	393	dev_name(dev), common);
	394	if (ret) {
	395	dev_err(dev, "irq request failed\n ");
	396	return ret;
	397	}
	398
3676d1dd KM	399	/*
	400	* rcar_has_irq_support() will be enabled
	401	*/
	402	common->base = devm_request_and_ioremap(dev, res);
	403	if (!common->base) {
	404	dev_err(dev, "Unable to ioremap thermal register\n");
	405	return -ENOMEM;
	406	}
e0a5172e KM	407
	408	/* enable temperature comparation */
	409	rcar_thermal_common_write(common, ENR, 0x00030303);
	410
	411	idle = 0; /* polling delaye is not needed */
1e426ffd KM	412	}
1e426ffd KM	413
3676d1dd KM	414	for (i = 0;; i++) {
	415	res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
	416	if (!res)
	417	break;
	418
	419	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	420	if (!priv) {
	421	dev_err(dev, "Could not allocate priv\n");
	422	return -ENOMEM;
	423	}
	424
	425	priv->base = devm_request_and_ioremap(dev, res);
	426	if (!priv->base) {
	427	dev_err(dev, "Unable to ioremap priv register\n");
	428	return -ENOMEM;
	429	}
	430
	431	priv->common = common;
e0a5172e	432	priv->id = i;
3676d1dd KM	433	mutex_init(&priv->lock);
3676d1dd KM	434	INIT_LIST_HEAD(&priv->list);
e0a5172e KM	435	INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
e0a5172e KM	436	rcar_thermal_update_temp(priv);
3676d1dd KM	437
	438	priv->zone = thermal_zone_device_register("rcar_thermal",
	439	1, 0, priv,
	440	&rcar_thermal_zone_ops, NULL, 0,
e0a5172e	441	idle);
3676d1dd KM	442	if (IS_ERR(priv->zone)) {
	443	dev_err(dev, "can't register thermal zone\n");
	444	goto error_unregister;
	445	}
	446
	447	list_move_tail(&priv->list, &common->head);
e0a5172e KM	448
	449	if (rcar_has_irq_support(priv))
	450	rcar_thermal_irq_enable(priv);
1e426ffd KM	451	}
1e426ffd KM	452
3676d1dd	453	platform_set_drvdata(pdev, common);
1e426ffd	454
3676d1dd	455	dev_info(dev, "%d sensor proved\n", i);
1e426ffd KM	456
1e426ffd KM	457	return 0;
3676d1dd KM	458
	459	error_unregister:
	460	rcar_thermal_for_each_priv(priv, common)
	461	thermal_zone_device_unregister(priv->zone);
	462
	463	return -ENODEV;
1e426ffd KM	464	}
	465
	466	static int rcar_thermal_remove(struct platform_device *pdev)
	467	{
3676d1dd KM	468	struct rcar_thermal_common *common = platform_get_drvdata(pdev);
	469	struct rcar_thermal_priv *priv;
	470
	471	rcar_thermal_for_each_priv(priv, common)
	472	thermal_zone_device_unregister(priv->zone);
1e426ffd	473
1e426ffd KM	474	platform_set_drvdata(pdev, NULL);
1e426ffd KM	475
1e426ffd KM	476	return 0;
	477	}
	478
76cc1887 KM	479	static const struct of_device_id rcar_thermal_dt_ids[] __devinitconst = {
	480	{ .compatible = "renesas,rcar-thermal", },
	481	{},
	482	};
	483	MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
	484
1e426ffd KM	485	static struct platform_driver rcar_thermal_driver = {
	486	.driver = {
	487	.name = "rcar_thermal",
76cc1887	488	.of_match_table = rcar_thermal_dt_ids,
1e426ffd KM	489	},
	490	.probe = rcar_thermal_probe,
	491	.remove = rcar_thermal_remove,
	492	};
	493	module_platform_driver(rcar_thermal_driver);
	494
	495	MODULE_LICENSE("GPL");
	496	MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
	497	MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");