[mirror_ubuntu-bionic-kernel.git] / drivers / thermal / rcar_gen3_thermal.c

/*
 *  R-Car Gen3 THS thermal sensor driver
 *  Based on rcar_thermal.c and work from Hien Dang and Khiem Nguyen.
 *
 * Copyright (C) 2016 Renesas Electronics Corporation.
 * Copyright (C) 2016 Sang Engineering
 *
 *  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.
 *
 */
#include <linux/delay.h>
#include <linux/err.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/spinlock.h>
#include <linux/thermal.h>

#include "thermal_core.h"

/* Register offsets */
#define REG_GEN3_IRQSTR		0x04
#define REG_GEN3_IRQMSK		0x08
#define REG_GEN3_IRQCTL		0x0C
#define REG_GEN3_IRQEN		0x10
#define REG_GEN3_IRQTEMP1	0x14
#define REG_GEN3_IRQTEMP2	0x18
#define REG_GEN3_IRQTEMP3	0x1C
#define REG_GEN3_CTSR		0x20
#define REG_GEN3_THCTR		0x20
#define REG_GEN3_TEMP		0x28
#define REG_GEN3_THCODE1	0x50
#define REG_GEN3_THCODE2	0x54
#define REG_GEN3_THCODE3	0x58

/* IRQ{STR,MSK,EN} bits */
#define IRQ_TEMP1		BIT(0)
#define IRQ_TEMP2		BIT(1)
#define IRQ_TEMP3		BIT(2)
#define IRQ_TEMPD1		BIT(3)
#define IRQ_TEMPD2		BIT(4)
#define IRQ_TEMPD3		BIT(5)

/* CTSR bits */
#define CTSR_PONM	BIT(8)
#define CTSR_AOUT	BIT(7)
#define CTSR_THBGR	BIT(5)
#define CTSR_VMEN	BIT(4)
#define CTSR_VMST	BIT(1)
#define CTSR_THSST	BIT(0)

/* THCTR bits */
#define THCTR_PONM	BIT(6)
#define THCTR_THSST	BIT(0)

#define CTEMP_MASK	0xFFF

#define MCELSIUS(temp)	((temp) * 1000)
#define GEN3_FUSE_MASK	0xFFF

#define TSC_MAX_NUM	3

/* Structure for thermal temperature calculation */
struct equation_coefs {
	int a1;
	int b1;
	int a2;
	int b2;
};

struct rcar_gen3_thermal_tsc {
	void __iomem *base;
	struct thermal_zone_device *zone;
	struct equation_coefs coef;
	int low;
	int high;
};

struct rcar_gen3_thermal_priv {
	struct rcar_gen3_thermal_tsc *tscs[TSC_MAX_NUM];
	unsigned int num_tscs;
	spinlock_t lock; /* Protect interrupts on and off */
	const struct rcar_gen3_thermal_data *data;
};

struct rcar_gen3_thermal_data {
	void (*thermal_init)(struct rcar_gen3_thermal_tsc *tsc);
};

static inline u32 rcar_gen3_thermal_read(struct rcar_gen3_thermal_tsc *tsc,
					 u32 reg)
{
	return ioread32(tsc->base + reg);
}

static inline void rcar_gen3_thermal_write(struct rcar_gen3_thermal_tsc *tsc,
					   u32 reg, u32 data)
{
	iowrite32(data, tsc->base + reg);
}

/*
 * Linear approximation for temperature
 *
 * [reg] = [temp] * a + b => [temp] = ([reg] - b) / a
 *
 * The constants a and b are calculated using two triplets of int values PTAT
 * and THCODE. PTAT and THCODE can either be read from hardware or use hard
 * coded values from driver. The formula to calculate a and b are taken from
 * BSP and sparsely documented and understood.
 *
 * Examining the linear formula and the formula used to calculate constants a
 * and b while knowing that the span for PTAT and THCODE values are between
 * 0x000 and 0xfff the largest integer possible is 0xfff * 0xfff == 0xffe001.
 * Integer also needs to be signed so that leaves 7 bits for binary
 * fixed point scaling.
 */

#define FIXPT_SHIFT 7
#define FIXPT_INT(_x) ((_x) << FIXPT_SHIFT)
#define INT_FIXPT(_x) ((_x) >> FIXPT_SHIFT)
#define FIXPT_DIV(_a, _b) DIV_ROUND_CLOSEST(((_a) << FIXPT_SHIFT), (_b))
#define FIXPT_TO_MCELSIUS(_x) ((_x) * 1000 >> FIXPT_SHIFT)

#define RCAR3_THERMAL_GRAN 500 /* mili Celsius */

/* no idea where these constants come from */
#define TJ_1 96
#define TJ_3 -41

static void rcar_gen3_thermal_calc_coefs(struct equation_coefs *coef,
					 int *ptat, int *thcode)
{
	int tj_2;

	/* TODO: Find documentation and document constant calculation formula */

	/*
	 * Division is not scaled in BSP and if scaled it might overflow
	 * the dividend (4095 * 4095 << 14 > INT_MAX) so keep it unscaled
	 */
	tj_2 = (FIXPT_INT((ptat[1] - ptat[2]) * 137)
		/ (ptat[0] - ptat[2])) - FIXPT_INT(41);

	coef->a1 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[2]),
			     tj_2 - FIXPT_INT(TJ_3));
	coef->b1 = FIXPT_INT(thcode[2]) - coef->a1 * TJ_3;

	coef->a2 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[0]),
			     tj_2 - FIXPT_INT(TJ_1));
	coef->b2 = FIXPT_INT(thcode[0]) - coef->a2 * TJ_1;
}

static int rcar_gen3_thermal_round(int temp)
{
	int result, round_offs;

	round_offs = temp >= 0 ? RCAR3_THERMAL_GRAN / 2 :
		-RCAR3_THERMAL_GRAN / 2;
	result = (temp + round_offs) / RCAR3_THERMAL_GRAN;
	return result * RCAR3_THERMAL_GRAN;
}

static int rcar_gen3_thermal_get_temp(void *devdata, int *temp)
{
	struct rcar_gen3_thermal_tsc *tsc = devdata;
	int mcelsius, val1, val2;
	u32 reg;

	/* Read register and convert to mili Celsius */
	reg = rcar_gen3_thermal_read(tsc, REG_GEN3_TEMP) & CTEMP_MASK;

	val1 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b1, tsc->coef.a1);
	val2 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b2, tsc->coef.a2);
	mcelsius = FIXPT_TO_MCELSIUS((val1 + val2) / 2);

	/* Make sure we are inside specifications */
	if ((mcelsius < MCELSIUS(-40)) || (mcelsius > MCELSIUS(125)))
		return -EIO;

	/* Round value to device granularity setting */
	*temp = rcar_gen3_thermal_round(mcelsius);

	return 0;
}

static int rcar_gen3_thermal_mcelsius_to_temp(struct rcar_gen3_thermal_tsc *tsc,
					      int mcelsius)
{
	int celsius, val1, val2;

	celsius = DIV_ROUND_CLOSEST(mcelsius, 1000);
	val1 = celsius * tsc->coef.a1 + tsc->coef.b1;
	val2 = celsius * tsc->coef.a2 + tsc->coef.b2;

	return INT_FIXPT((val1 + val2) / 2);
}

static int rcar_gen3_thermal_set_trips(void *devdata, int low, int high)
{
	struct rcar_gen3_thermal_tsc *tsc = devdata;

	low = clamp_val(low, -40000, 125000);
	high = clamp_val(high, -40000, 125000);

	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP1,
				rcar_gen3_thermal_mcelsius_to_temp(tsc, low));

	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP2,
				rcar_gen3_thermal_mcelsius_to_temp(tsc, high));

	tsc->low = low;
	tsc->high = high;

	return 0;
}

static const struct thermal_zone_of_device_ops rcar_gen3_tz_of_ops = {
	.get_temp	= rcar_gen3_thermal_get_temp,
	.set_trips	= rcar_gen3_thermal_set_trips,
};

static void rcar_thermal_irq_set(struct rcar_gen3_thermal_priv *priv, bool on)
{
	unsigned int i;
	u32 val = on ? IRQ_TEMPD1 | IRQ_TEMP2 : 0;

	for (i = 0; i < priv->num_tscs; i++)
		rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQMSK, val);
}

static irqreturn_t rcar_gen3_thermal_irq(int irq, void *data)
{
	struct rcar_gen3_thermal_priv *priv = data;
	u32 status;
	int i, ret = IRQ_HANDLED;

	spin_lock(&priv->lock);
	for (i = 0; i < priv->num_tscs; i++) {
		status = rcar_gen3_thermal_read(priv->tscs[i], REG_GEN3_IRQSTR);
		rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQSTR, 0);
		if (status)
			ret = IRQ_WAKE_THREAD;
	}

	if (ret == IRQ_WAKE_THREAD)
		rcar_thermal_irq_set(priv, false);

	spin_unlock(&priv->lock);

	return ret;
}

static irqreturn_t rcar_gen3_thermal_irq_thread(int irq, void *data)
{
	struct rcar_gen3_thermal_priv *priv = data;
	unsigned long flags;
	int i;

	for (i = 0; i < priv->num_tscs; i++)
		thermal_zone_device_update(priv->tscs[i]->zone,
					   THERMAL_EVENT_UNSPECIFIED);

	spin_lock_irqsave(&priv->lock, flags);
	rcar_thermal_irq_set(priv, true);
	spin_unlock_irqrestore(&priv->lock, flags);

	return IRQ_HANDLED;
}

static void r8a7795_thermal_init(struct rcar_gen3_thermal_tsc *tsc)
{
	rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,  CTSR_THBGR);
	rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,  0x0);

	usleep_range(1000, 2000);

	rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_PONM);

	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F);
	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN, IRQ_TEMPD1 | IRQ_TEMP2);

	rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
				CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN);

	usleep_range(100, 200);

	rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
				CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN |
				CTSR_VMST | CTSR_THSST);

	usleep_range(1000, 2000);
}

static void r8a7796_thermal_init(struct rcar_gen3_thermal_tsc *tsc)
{
	u32 reg_val;

	reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
	reg_val &= ~THCTR_PONM;
	rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);

	usleep_range(1000, 2000);

	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F);
	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN, IRQ_TEMPD1 | IRQ_TEMP2);

	reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
	reg_val |= THCTR_THSST;
	rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);

	usleep_range(1000, 2000);
}

static const struct rcar_gen3_thermal_data r8a7795_data = {
	.thermal_init = r8a7795_thermal_init,
};

static const struct rcar_gen3_thermal_data r8a7796_data = {
	.thermal_init = r8a7796_thermal_init,
};

static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
	{ .compatible = "renesas,r8a7795-thermal", .data = &r8a7795_data},
	{ .compatible = "renesas,r8a7796-thermal", .data = &r8a7796_data},
	{},
};
MODULE_DEVICE_TABLE(of, rcar_gen3_thermal_dt_ids);

static int rcar_gen3_thermal_remove(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;

	pm_runtime_put(dev);
	pm_runtime_disable(dev);

	return 0;
}

static int rcar_gen3_thermal_probe(struct platform_device *pdev)
{
	struct rcar_gen3_thermal_priv *priv;
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct thermal_zone_device *zone;
	int ret, irq, i;
	char *irqname;

	/* default values if FUSEs are missing */
	/* TODO: Read values from hardware on supported platforms */
	int ptat[3] = { 2351, 1509, 435 };
	int thcode[TSC_MAX_NUM][3] = {
		{ 3248, 2800, 2221 },
		{ 3245, 2795, 2216 },
		{ 3250, 2805, 2237 },
	};

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->data = of_device_get_match_data(dev);

	spin_lock_init(&priv->lock);

	platform_set_drvdata(pdev, priv);

	/*
	 * Request 2 (of the 3 possible) IRQs, the driver only needs to
	 * to trigger on the low and high trip points of the current
	 * temp window at this point.
	 */
	for (i = 0; i < 2; i++) {
		irq = platform_get_irq(pdev, i);
		if (irq < 0)
			return irq;

		irqname = devm_kasprintf(dev, GFP_KERNEL, "%s:ch%d",
					 dev_name(dev), i);
		if (!irqname)
			return -ENOMEM;

		ret = devm_request_threaded_irq(dev, irq, rcar_gen3_thermal_irq,
						rcar_gen3_thermal_irq_thread,
						IRQF_SHARED, irqname, priv);
		if (ret)
			return ret;
	}

	pm_runtime_enable(dev);
	pm_runtime_get_sync(dev);

	for (i = 0; i < TSC_MAX_NUM; i++) {
		struct rcar_gen3_thermal_tsc *tsc;

		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
		if (!res)
			break;

		tsc = devm_kzalloc(dev, sizeof(*tsc), GFP_KERNEL);
		if (!tsc) {
			ret = -ENOMEM;
			goto error_unregister;
		}

		tsc->base = devm_ioremap_resource(dev, res);
		if (IS_ERR(tsc->base)) {
			ret = PTR_ERR(tsc->base);
			goto error_unregister;
		}

		priv->tscs[i] = tsc;

		priv->data->thermal_init(tsc);
		rcar_gen3_thermal_calc_coefs(&tsc->coef, ptat, thcode[i]);

		zone = devm_thermal_zone_of_sensor_register(dev, i, tsc,
							    &rcar_gen3_tz_of_ops);
		if (IS_ERR(zone)) {
			dev_err(dev, "Can't register thermal zone\n");
			ret = PTR_ERR(zone);
			goto error_unregister;
		}
		tsc->zone = zone;

		ret = of_thermal_get_ntrips(tsc->zone);
		if (ret < 0)
			goto error_unregister;

		dev_info(dev, "TSC%d: Loaded %d trip points\n", i, ret);
	}

	priv->num_tscs = i;

	if (!priv->num_tscs) {
		ret = -ENODEV;
		goto error_unregister;
	}

	rcar_thermal_irq_set(priv, true);

	return 0;

error_unregister:
	rcar_gen3_thermal_remove(pdev);

	return ret;
}

static int __maybe_unused rcar_gen3_thermal_suspend(struct device *dev)
{
	struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev);

	rcar_thermal_irq_set(priv, false);

	return 0;
}

static int __maybe_unused rcar_gen3_thermal_resume(struct device *dev)
{
	struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev);
	unsigned int i;

	for (i = 0; i < priv->num_tscs; i++) {
		struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];

		priv->data->thermal_init(tsc);
		rcar_gen3_thermal_set_trips(tsc, tsc->low, tsc->high);
	}

	rcar_thermal_irq_set(priv, true);

	return 0;
}

static SIMPLE_DEV_PM_OPS(rcar_gen3_thermal_pm_ops, rcar_gen3_thermal_suspend,
			 rcar_gen3_thermal_resume);

static struct platform_driver rcar_gen3_thermal_driver = {
	.driver	= {
		.name	= "rcar_gen3_thermal",
		.pm = &rcar_gen3_thermal_pm_ops,
		.of_match_table = rcar_gen3_thermal_dt_ids,
	},
	.probe		= rcar_gen3_thermal_probe,
	.remove		= rcar_gen3_thermal_remove,
};
module_platform_driver(rcar_gen3_thermal_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("R-Car Gen3 THS thermal sensor driver");
MODULE_AUTHOR("Wolfram Sang <wsa+renesas@sang-engineering.com>");
Commit	Line	Data
564e73d2 WS	1	/*
	2	* R-Car Gen3 THS thermal sensor driver
	3	* Based on rcar_thermal.c and work from Hien Dang and Khiem Nguyen.
	4	*
	5	* Copyright (C) 2016 Renesas Electronics Corporation.
	6	* Copyright (C) 2016 Sang Engineering
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; version 2 of the License.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	*/
	18	#include <linux/delay.h>
	19	#include <linux/err.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/io.h>
	22	#include <linux/module.h>
564e73d2 WS	23	#include <linux/of_device.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/pm_runtime.h>
7d4b2697	26	#include <linux/spinlock.h>
564e73d2 WS	27	#include <linux/thermal.h>
564e73d2 WS	28
7d4b2697 NS	29	#include "thermal_core.h"
7d4b2697 NS	30
564e73d2 WS	31	/* Register offsets */
	32	#define REG_GEN3_IRQSTR 0x04
	33	#define REG_GEN3_IRQMSK 0x08
	34	#define REG_GEN3_IRQCTL 0x0C
	35	#define REG_GEN3_IRQEN 0x10
	36	#define REG_GEN3_IRQTEMP1 0x14
	37	#define REG_GEN3_IRQTEMP2 0x18
	38	#define REG_GEN3_IRQTEMP3 0x1C
	39	#define REG_GEN3_CTSR 0x20
	40	#define REG_GEN3_THCTR 0x20
	41	#define REG_GEN3_TEMP 0x28
	42	#define REG_GEN3_THCODE1 0x50
	43	#define REG_GEN3_THCODE2 0x54
	44	#define REG_GEN3_THCODE3 0x58
	45
7d4b2697 NS	46	/* IRQ{STR,MSK,EN} bits */
	47	#define IRQ_TEMP1 BIT(0)
	48	#define IRQ_TEMP2 BIT(1)
	49	#define IRQ_TEMP3 BIT(2)
	50	#define IRQ_TEMPD1 BIT(3)
	51	#define IRQ_TEMPD2 BIT(4)
	52	#define IRQ_TEMPD3 BIT(5)
	53
564e73d2 WS	54	/* CTSR bits */
	55	#define CTSR_PONM BIT(8)
	56	#define CTSR_AOUT BIT(7)
	57	#define CTSR_THBGR BIT(5)
	58	#define CTSR_VMEN BIT(4)
	59	#define CTSR_VMST BIT(1)
	60	#define CTSR_THSST BIT(0)
	61
	62	/* THCTR bits */
	63	#define THCTR_PONM BIT(6)
	64	#define THCTR_THSST BIT(0)
	65
	66	#define CTEMP_MASK 0xFFF
	67
	68	#define MCELSIUS(temp) ((temp) * 1000)
	69	#define GEN3_FUSE_MASK 0xFFF
	70
	71	#define TSC_MAX_NUM 3
	72
	73	/* Structure for thermal temperature calculation */
	74	struct equation_coefs {
	75	int a1;
	76	int b1;
	77	int a2;
	78	int b2;
	79	};
	80
	81	struct rcar_gen3_thermal_tsc {
	82	void __iomem *base;
	83	struct thermal_zone_device *zone;
	84	struct equation_coefs coef;
75f78d6d NS	85	int low;
75f78d6d NS	86	int high;
564e73d2 WS	87	};
	88
	89	struct rcar_gen3_thermal_priv {
	90	struct rcar_gen3_thermal_tsc *tscs[TSC_MAX_NUM];
97dad1f1	91	unsigned int num_tscs;
7d4b2697	92	spinlock_t lock; /* Protect interrupts on and off */
cc4d072b	93	const struct rcar_gen3_thermal_data *data;
564e73d2 WS	94	};
	95
	96	struct rcar_gen3_thermal_data {
	97	void (thermal_init)(struct rcar_gen3_thermal_tsc tsc);
	98	};
	99
	100	static inline u32 rcar_gen3_thermal_read(struct rcar_gen3_thermal_tsc *tsc,
	101	u32 reg)
	102	{
	103	return ioread32(tsc->base + reg);
	104	}
	105
	106	static inline void rcar_gen3_thermal_write(struct rcar_gen3_thermal_tsc *tsc,
	107	u32 reg, u32 data)
	108	{
	109	iowrite32(data, tsc->base + reg);
	110	}
	111
	112	/*
	113	* Linear approximation for temperature
	114	*
	115	* [reg] = [temp] * a + b => [temp] = ([reg] - b) / a
	116	*
	117	* The constants a and b are calculated using two triplets of int values PTAT
	118	* and THCODE. PTAT and THCODE can either be read from hardware or use hard
	119	* coded values from driver. The formula to calculate a and b are taken from
	120	* BSP and sparsely documented and understood.
	121	*
	122	* Examining the linear formula and the formula used to calculate constants a
	123	* and b while knowing that the span for PTAT and THCODE values are between
	124	* 0x000 and 0xfff the largest integer possible is 0xfff * 0xfff == 0xffe001.
	125	* Integer also needs to be signed so that leaves 7 bits for binary
	126	* fixed point scaling.
	127	*/
	128
	129	#define FIXPT_SHIFT 7
	130	#define FIXPT_INT(_x) ((_x) << FIXPT_SHIFT)
7d4b2697	131	#define INT_FIXPT(_x) ((_x) >> FIXPT_SHIFT)
564e73d2 WS	132	#define FIXPT_DIV(_a, _b) DIV_ROUND_CLOSEST(((_a) << FIXPT_SHIFT), (_b))
	133	#define FIXPT_TO_MCELSIUS(_x) ((_x) * 1000 >> FIXPT_SHIFT)
	134
	135	#define RCAR3_THERMAL_GRAN 500 /* mili Celsius */
	136
	137	/* no idea where these constants come from */
	138	#define TJ_1 96
	139	#define TJ_3 -41
	140
	141	static void rcar_gen3_thermal_calc_coefs(struct equation_coefs *coef,
	142	int ptat, int thcode)
	143	{
	144	int tj_2;
	145
	146	/* TODO: Find documentation and document constant calculation formula */
	147
	148	/*
	149	* Division is not scaled in BSP and if scaled it might overflow
	150	* the dividend (4095 * 4095 << 14 > INT_MAX) so keep it unscaled
	151	*/
	152	tj_2 = (FIXPT_INT((ptat[1] - ptat[2]) * 137)
	153	/ (ptat[0] - ptat[2])) - FIXPT_INT(41);
	154
	155	coef->a1 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[2]),
	156	tj_2 - FIXPT_INT(TJ_3));
	157	coef->b1 = FIXPT_INT(thcode[2]) - coef->a1 * TJ_3;
	158
	159	coef->a2 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[0]),
	160	tj_2 - FIXPT_INT(TJ_1));
	161	coef->b2 = FIXPT_INT(thcode[0]) - coef->a2 * TJ_1;
	162	}
	163
	164	static int rcar_gen3_thermal_round(int temp)
	165	{
	166	int result, round_offs;
	167
	168	round_offs = temp >= 0 ? RCAR3_THERMAL_GRAN / 2 :
	169	-RCAR3_THERMAL_GRAN / 2;
	170	result = (temp + round_offs) / RCAR3_THERMAL_GRAN;
	171	return result * RCAR3_THERMAL_GRAN;
	172	}
	173
	174	static int rcar_gen3_thermal_get_temp(void devdata, int temp)
	175	{
	176	struct rcar_gen3_thermal_tsc *tsc = devdata;
	177	int mcelsius, val1, val2;
	178	u32 reg;
	179
	180	/* Read register and convert to mili Celsius */
564e73d2 WS	181	reg = rcar_gen3_thermal_read(tsc, REG_GEN3_TEMP) & CTEMP_MASK;
	182
	183	val1 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b1, tsc->coef.a1);
	184	val2 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b2, tsc->coef.a2);
	185	mcelsius = FIXPT_TO_MCELSIUS((val1 + val2) / 2);
	186
564e73d2 WS	187	/* Make sure we are inside specifications */
	188	if ((mcelsius < MCELSIUS(-40)) \|\| (mcelsius > MCELSIUS(125)))
	189	return -EIO;
	190
	191	/* Round value to device granularity setting */
	192	*temp = rcar_gen3_thermal_round(mcelsius);
	193
	194	return 0;
	195	}
	196
7d4b2697 NS	197	static int rcar_gen3_thermal_mcelsius_to_temp(struct rcar_gen3_thermal_tsc *tsc,
	198	int mcelsius)
	199	{
	200	int celsius, val1, val2;
	201
	202	celsius = DIV_ROUND_CLOSEST(mcelsius, 1000);
	203	val1 = celsius * tsc->coef.a1 + tsc->coef.b1;
	204	val2 = celsius * tsc->coef.a2 + tsc->coef.b2;
	205
	206	return INT_FIXPT((val1 + val2) / 2);
	207	}
	208
	209	static int rcar_gen3_thermal_set_trips(void *devdata, int low, int high)
	210	{
	211	struct rcar_gen3_thermal_tsc *tsc = devdata;
	212
	213	low = clamp_val(low, -40000, 125000);
	214	high = clamp_val(high, -40000, 125000);
	215
	216	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP1,
	217	rcar_gen3_thermal_mcelsius_to_temp(tsc, low));
	218
	219	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP2,
	220	rcar_gen3_thermal_mcelsius_to_temp(tsc, high));
	221
75f78d6d NS	222	tsc->low = low;
	223	tsc->high = high;
	224
7d4b2697 NS	225	return 0;
	226	}
	227
a0def10b	228	static const struct thermal_zone_of_device_ops rcar_gen3_tz_of_ops = {
564e73d2	229	.get_temp = rcar_gen3_thermal_get_temp,
7d4b2697	230	.set_trips = rcar_gen3_thermal_set_trips,
564e73d2 WS	231	};
564e73d2 WS	232
7d4b2697 NS	233	static void rcar_thermal_irq_set(struct rcar_gen3_thermal_priv *priv, bool on)
	234	{
	235	unsigned int i;
	236	u32 val = on ? IRQ_TEMPD1 \| IRQ_TEMP2 : 0;
	237
	238	for (i = 0; i < priv->num_tscs; i++)
	239	rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQMSK, val);
	240	}
	241
	242	static irqreturn_t rcar_gen3_thermal_irq(int irq, void *data)
	243	{
	244	struct rcar_gen3_thermal_priv *priv = data;
	245	u32 status;
	246	int i, ret = IRQ_HANDLED;
	247
	248	spin_lock(&priv->lock);
	249	for (i = 0; i < priv->num_tscs; i++) {
	250	status = rcar_gen3_thermal_read(priv->tscs[i], REG_GEN3_IRQSTR);
	251	rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQSTR, 0);
	252	if (status)
	253	ret = IRQ_WAKE_THREAD;
	254	}
	255
	256	if (ret == IRQ_WAKE_THREAD)
	257	rcar_thermal_irq_set(priv, false);
	258
	259	spin_unlock(&priv->lock);
	260
	261	return ret;
	262	}
	263
	264	static irqreturn_t rcar_gen3_thermal_irq_thread(int irq, void *data)
	265	{
	266	struct rcar_gen3_thermal_priv *priv = data;
	267	unsigned long flags;
	268	int i;
	269
	270	for (i = 0; i < priv->num_tscs; i++)
	271	thermal_zone_device_update(priv->tscs[i]->zone,
	272	THERMAL_EVENT_UNSPECIFIED);
	273
	274	spin_lock_irqsave(&priv->lock, flags);
	275	rcar_thermal_irq_set(priv, true);
	276	spin_unlock_irqrestore(&priv->lock, flags);
	277
	278	return IRQ_HANDLED;
	279	}
	280
564e73d2 WS	281	static void r8a7795_thermal_init(struct rcar_gen3_thermal_tsc *tsc)
	282	{
	283	rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_THBGR);
	284	rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, 0x0);
	285
	286	usleep_range(1000, 2000);
	287
	288	rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_PONM);
7d4b2697	289
564e73d2	290	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F);
7d4b2697 NS	291	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
	292	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN, IRQ_TEMPD1 \| IRQ_TEMP2);
	293
564e73d2 WS	294	rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
	295	CTSR_PONM \| CTSR_AOUT \| CTSR_THBGR \| CTSR_VMEN);
	296
	297	usleep_range(100, 200);
	298
	299	rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
	300	CTSR_PONM \| CTSR_AOUT \| CTSR_THBGR \| CTSR_VMEN \|
	301	CTSR_VMST \| CTSR_THSST);
	302
	303	usleep_range(1000, 2000);
	304	}
	305
	306	static void r8a7796_thermal_init(struct rcar_gen3_thermal_tsc *tsc)
	307	{
	308	u32 reg_val;
	309
	310	reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
	311	reg_val &= ~THCTR_PONM;
	312	rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);
	313
	314	usleep_range(1000, 2000);
	315
	316	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F);
7d4b2697 NS	317	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
	318	rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN, IRQ_TEMPD1 \| IRQ_TEMP2);
	319
564e73d2 WS	320	reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
	321	reg_val \|= THCTR_THSST;
	322	rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);
78aefd2d NS	323
78aefd2d NS	324	usleep_range(1000, 2000);
564e73d2 WS	325	}
	326
	327	static const struct rcar_gen3_thermal_data r8a7795_data = {
	328	.thermal_init = r8a7795_thermal_init,
	329	};
	330
	331	static const struct rcar_gen3_thermal_data r8a7796_data = {
	332	.thermal_init = r8a7796_thermal_init,
	333	};
	334
	335	static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
	336	{ .compatible = "renesas,r8a7795-thermal", .data = &r8a7795_data},
	337	{ .compatible = "renesas,r8a7796-thermal", .data = &r8a7796_data},
	338	{},
	339	};
	340	MODULE_DEVICE_TABLE(of, rcar_gen3_thermal_dt_ids);
	341
	342	static int rcar_gen3_thermal_remove(struct platform_device *pdev)
	343	{
	344	struct device *dev = &pdev->dev;
	345
	346	pm_runtime_put(dev);
	347	pm_runtime_disable(dev);
	348
	349	return 0;
	350	}
	351
	352	static int rcar_gen3_thermal_probe(struct platform_device *pdev)
	353	{
	354	struct rcar_gen3_thermal_priv *priv;
	355	struct device *dev = &pdev->dev;
	356	struct resource *res;
	357	struct thermal_zone_device *zone;
7d4b2697 NS	358	int ret, irq, i;
7d4b2697 NS	359	char *irqname;
564e73d2 WS	360
	361	/* default values if FUSEs are missing */
	362	/* TODO: Read values from hardware on supported platforms */
	363	int ptat[3] = { 2351, 1509, 435 };
	364	int thcode[TSC_MAX_NUM][3] = {
	365	{ 3248, 2800, 2221 },
	366	{ 3245, 2795, 2216 },
	367	{ 3250, 2805, 2237 },
	368	};
	369
	370	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	371	if (!priv)
	372	return -ENOMEM;
	373
cc4d072b NS	374	priv->data = of_device_get_match_data(dev);
cc4d072b NS	375
7d4b2697 NS	376	spin_lock_init(&priv->lock);
7d4b2697 NS	377
564e73d2 WS	378	platform_set_drvdata(pdev, priv);
564e73d2 WS	379
7d4b2697 NS	380	/*
	381	* Request 2 (of the 3 possible) IRQs, the driver only needs to
	382	* to trigger on the low and high trip points of the current
	383	* temp window at this point.
	384	*/
	385	for (i = 0; i < 2; i++) {
	386	irq = platform_get_irq(pdev, i);
	387	if (irq < 0)
	388	return irq;
	389
	390	irqname = devm_kasprintf(dev, GFP_KERNEL, "%s:ch%d",
	391	dev_name(dev), i);
	392	if (!irqname)
	393	return -ENOMEM;
	394
	395	ret = devm_request_threaded_irq(dev, irq, rcar_gen3_thermal_irq,
	396	rcar_gen3_thermal_irq_thread,
	397	IRQF_SHARED, irqname, priv);
	398	if (ret)
	399	return ret;
	400	}
	401
564e73d2 WS	402	pm_runtime_enable(dev);
	403	pm_runtime_get_sync(dev);
	404
	405	for (i = 0; i < TSC_MAX_NUM; i++) {
	406	struct rcar_gen3_thermal_tsc *tsc;
	407
d51546c0 NS	408	res = platform_get_resource(pdev, IORESOURCE_MEM, i);
	409	if (!res)
	410	break;
	411
564e73d2 WS	412	tsc = devm_kzalloc(dev, sizeof(*tsc), GFP_KERNEL);
	413	if (!tsc) {
	414	ret = -ENOMEM;
	415	goto error_unregister;
	416	}
	417
564e73d2 WS	418	tsc->base = devm_ioremap_resource(dev, res);
	419	if (IS_ERR(tsc->base)) {
	420	ret = PTR_ERR(tsc->base);
	421	goto error_unregister;
	422	}
	423
	424	priv->tscs[i] = tsc;
564e73d2	425
cc4d072b	426	priv->data->thermal_init(tsc);
564e73d2 WS	427	rcar_gen3_thermal_calc_coefs(&tsc->coef, ptat, thcode[i]);
	428
	429	zone = devm_thermal_zone_of_sensor_register(dev, i, tsc,
	430	&rcar_gen3_tz_of_ops);
	431	if (IS_ERR(zone)) {
	432	dev_err(dev, "Can't register thermal zone\n");
	433	ret = PTR_ERR(zone);
	434	goto error_unregister;
	435	}
	436	tsc->zone = zone;
7d4b2697 NS	437
	438	ret = of_thermal_get_ntrips(tsc->zone);
	439	if (ret < 0)
	440	goto error_unregister;
	441
	442	dev_info(dev, "TSC%d: Loaded %d trip points\n", i, ret);
564e73d2 WS	443	}
564e73d2 WS	444
97dad1f1 NS	445	priv->num_tscs = i;
	446
	447	if (!priv->num_tscs) {
	448	ret = -ENODEV;
	449	goto error_unregister;
	450	}
	451
7d4b2697 NS	452	rcar_thermal_irq_set(priv, true);
7d4b2697 NS	453
564e73d2 WS	454	return 0;
	455
	456	error_unregister:
	457	rcar_gen3_thermal_remove(pdev);
	458
	459	return ret;
	460	}
	461
75f78d6d NS	462	static int __maybe_unused rcar_gen3_thermal_suspend(struct device *dev)
	463	{
	464	struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev);
	465
	466	rcar_thermal_irq_set(priv, false);
	467
	468	return 0;
	469	}
	470
	471	static int __maybe_unused rcar_gen3_thermal_resume(struct device *dev)
	472	{
	473	struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev);
	474	unsigned int i;
	475
	476	for (i = 0; i < priv->num_tscs; i++) {
	477	struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
	478
	479	priv->data->thermal_init(tsc);
	480	rcar_gen3_thermal_set_trips(tsc, tsc->low, tsc->high);
	481	}
	482
	483	rcar_thermal_irq_set(priv, true);
	484
	485	return 0;
	486	}
	487
	488	static SIMPLE_DEV_PM_OPS(rcar_gen3_thermal_pm_ops, rcar_gen3_thermal_suspend,
	489	rcar_gen3_thermal_resume);
	490
564e73d2 WS	491	static struct platform_driver rcar_gen3_thermal_driver = {
	492	.driver = {
	493	.name = "rcar_gen3_thermal",
75f78d6d	494	.pm = &rcar_gen3_thermal_pm_ops,
564e73d2 WS	495	.of_match_table = rcar_gen3_thermal_dt_ids,
	496	},
	497	.probe = rcar_gen3_thermal_probe,
	498	.remove = rcar_gen3_thermal_remove,
	499	};
	500	module_platform_driver(rcar_gen3_thermal_driver);
	501
	502	MODULE_LICENSE("GPL v2");
	503	MODULE_DESCRIPTION("R-Car Gen3 THS thermal sensor driver");
	504	MODULE_AUTHOR("Wolfram Sang <wsa+renesas@sang-engineering.com>");