Message-ID: <20141024082108.GB39338@dtor-ws>
Date:	Fri, 24 Oct 2014 01:21:08 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Caesar Wang <caesar.wang@...k-chips.com>
Cc:	heiko@...ech.de, rui.zhang@...el.com, edubezval@...il.com,
	zyf@...k-chips.com, dianders@...omium.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	cf@...k-chips.com, dbasehore@...omium.org, huangtao@...k-chips.com,
	cjf@...k-chips.com, zhengsq@...k-chips.com
Subject: Re: [PATCH v13 1/5] thermal: rockchip: add driver for thermal

On Thu, Oct 23, 2014 at 05:55:46PM -0700, Dmitry Torokhov wrote:
> Hi Caesar,
> 
> On Thu, Oct 23, 2014 at 05:40:03PM +0800, Caesar Wang wrote:
> > Thermal is TS-ADC Controller module supports
> > user-defined mode and automatic mode.
> > 
> > User-defined mode refers,TSADC all the control signals entirely by
> > software writing to register for direct control.
> > 
> > Automaic mode refers to the module automatically poll TSADC output,
> > and the results were checked.If you find that the temperature High
> > in a period of time,an interrupt is generated to the processor
> > down-measures taken;If the temperature over a period of time High,
> > the resulting TSHUT gave CRU module,let it reset the entire chip,
> > or via GPIO give PMIC.
> > 
> > Signed-off-by: zhaoyifeng <zyf@...k-chips.com>
> > Signed-off-by: Caesar Wang <caesar.wang@...k-chips.com>
> > ---
> >  drivers/thermal/Kconfig            |   9 +
> >  drivers/thermal/Makefile           |   1 +
> >  drivers/thermal/rockchip_thermal.c | 693 +++++++++++++++++++++++++++++++++++++
> >  3 files changed, 703 insertions(+)
> >  create mode 100644 drivers/thermal/rockchip_thermal.c
> > 
> > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> > index ef5587f..5efcf73 100644
> > --- a/drivers/thermal/Kconfig
> > +++ b/drivers/thermal/Kconfig
> > @@ -133,6 +133,15 @@ config SPEAR_THERMAL
> >  	  Enable this to plug the SPEAr thermal sensor driver into the Linux
> >  	  thermal framework.
> >  
> > +config ROCKCHIP_THERMAL
> > +	tristate "Rockchip thermal driver"
> > +	depends on ARCH_ROCKCHIP
> > +	help
> > +	  Rockchip thermal driver provides support for Temperature sensor
> > +	  ADC (TS-ADC) found on Rockchip SoCs. It supports one critical
> > +	  trip point. Cpufreq is used as the cooling device and will throttle
> > +	  CPUs when the Temperature crosses the passive trip point.
> > +
> >  config RCAR_THERMAL
> >  	tristate "Renesas R-Car thermal driver"
> >  	depends on ARCH_SHMOBILE || COMPILE_TEST
> > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> > index 31e232f..21da0a8 100644
> > --- a/drivers/thermal/Makefile
> > +++ b/drivers/thermal/Makefile
> > @@ -19,6 +19,7 @@ thermal_sys-$(CONFIG_CPU_THERMAL)	+= cpu_cooling.o
> >  
> >  # platform thermal drivers
> >  obj-$(CONFIG_SPEAR_THERMAL)	+= spear_thermal.o
> > +obj-$(CONFIG_ROCKCHIP_THERMAL)	+= rockchip_thermal.o
> >  obj-$(CONFIG_RCAR_THERMAL)	+= rcar_thermal.o
> >  obj-$(CONFIG_KIRKWOOD_THERMAL)  += kirkwood_thermal.o
> >  obj-y				+= samsung/
> > diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
> > new file mode 100644
> > index 0000000..6705981
> > --- /dev/null
> > +++ b/drivers/thermal/rockchip_thermal.c
> > @@ -0,0 +1,693 @@
> > +/*
> > + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms and conditions of the GNU General Public License,
> > + * version 2, as published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope 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/clk.h>
> > +#include <linux/cpu_cooling.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/io.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_address.h>
> > +#include <linux/of_irq.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/thermal.h>
> > +
> > +/**
> > + * If the temperature over a period of time High,
> > + * the resulting TSHUT gave CRU module,let it reset the entire chip,
> > + * or via GPIO give PMIC.
> > + */
> > +enum tshut_mode {
> > +	TSHUT_MODE_CRU = 0,
> > +	TSHUT_MODE_GPIO,
> > +};
> > +
> > +/**
> > + * the system Temperature Sensors tshut(tshut) polarity
> > + * the bit 8 is tshut polarity.
> > + * 0: low active, 1: high active
> > + */
> > +enum tshut_polarity {
> > +	TSHUT_LOW_ACTIVE = 0,
> > +	TSHUT_HIGH_ACTIVE,
> > +};
> > +
> > +/**
> > + * The system has three Temperature Sensors.  channel 0 is reserved,
> > + * channel 1 is for CPU, and channel 2 is for GPU.
> > + */
> > +enum sensor_id {
> > +	SENSOR_CPU = 1,
> > +	SENSOR_GPU,
> > +};
> > +
> > +
> > +struct rockchip_tsadc_chip {
> > +	long hw_shut_temp;
> > +	enum tshut_mode tshut_mode;
> > +	enum tshut_polarity tshut_polarity;
> > +
> > +	/* Chip-wide methods */
> > +	void (*initialize)(void __iomem *reg, enum tshut_polarity p);
> > +	void (*irq_ack)(void __iomem *reg);
> > +
> > +	/* Per-sensor methods */
> > +	int (*get_temp)(int chn, void __iomem *reg, long *temp);
> > +	void (*set_alarm_temp)(int chn, void __iomem *reg, long temp);
> > +	void (*set_tshut_temp)(int chn, void __iomem *reg, long temp);
> > +	void (*set_tshut_mode)(int chn, void __iomem *reg, enum tshut_mode m);
> > +	void (*control)(int chn, void __iomem *reg, bool on);
> > +};
> > +
> > +struct rockchip_thermal_sensor {
> > +	struct rockchip_thermal_data *thermal;
> > +	struct thermal_zone_device *tzd;
> > +	enum sensor_id id;
> > +};
> > +
> > +#define NUM_SENSORS	2 /* Ignore unused sensor 0 */
> > +
> > +struct rockchip_thermal_data {
> > +	const struct rockchip_tsadc_chip *chip;
> > +	struct platform_device *pdev;
> > +
> > +	struct rockchip_thermal_sensor sensors[NUM_SENSORS];
> > +
> > +	struct thermal_cooling_device *cdev;
> > +
> > +	struct clk *clk;
> > +	struct clk *pclk;
> > +
> > +	void __iomem *regs;
> > +
> > +	long hw_shut_temp;
> > +	enum tshut_mode tshut_mode;
> > +	enum tshut_polarity tshut_polarity;
> > +};
> > +
> > +/* TSADC V2 Sensor info define: */
> > +#define TSADCV2_AUTO_CON			0x04
> > +#define TSADCV2_INT_EN				0x08
> > +#define TSADCV2_INT_PD				0x0c
> > +#define TSADCV2_DATA(chn)			(0x20 + (chn) * 0x04)
> > +#define TSADCV2_COMP_INT(chn)		        (0x30 + (chn) * 0x04)
> > +#define TSADCV2_COMP_SHUT(chn)		        (0x40 + (chn) * 0x04)
> > +#define TSADCV2_HIGHT_INT_DEBOUNCE		0x60
> > +#define TSADCV2_HIGHT_TSHUT_DEBOUNCE		0x64
> > +#define TSADCV2_AUTO_PERIOD			0x68
> > +#define TSADCV2_AUTO_PERIOD_HT			0x6c
> > +
> > +#define TSADCV2_AUTO_EN				BIT(0)
> > +#define TSADCV2_AUTO_DISABLE			~BIT(0)
> > +#define TSADCV2_AUTO_SRC_EN(chn)		BIT(4 + (chn))
> > +#define TSADCV2_AUTO_TSHUT_POLARITY_HIGH	BIT(8)
> > +#define TSADCV2_AUTO_TSHUT_POLARITY_LOW		~BIT(8)
> > +
> > +#define TSADCV2_INT_SRC_EN(chn)			BIT(chn)
> > +#define TSADCV2_SHUT_2GPIO_SRC_EN(chn)		BIT(4 + (chn))
> > +#define TSADCV2_SHUT_2CRU_SRC_EN(chn)		BIT(8 + (chn))
> > +
> > +#define TSADCV2_INT_PD_CLEAR			~BIT(8)
> > +
> > +#define TSADCV2_DATA_MASK			0xfff
> > +#define TSADCV2_HIGHT_INT_DEBOUNCE_TIME		0x0a
> > +#define TSADCV2_HIGHT_TSHUT_DEBOUNCE_TIME	0x0a
> > +#define TSADCV2_AUTO_PERIOD_TIME		0x03e8
> > +#define TSADCV2_AUTO_PERIOD_HT_TIME		0x64
> > +
> > +struct tsadc_table {
> > +	unsigned long code;
> > +	long temp;
> > +};
> > +
> > +static const struct tsadc_table v2_code_table[] = {
> > +	{TSADCV2_DATA_MASK, -40000},
> > +	{3800, -40000},
> > +	{3792, -35000},
> > +	{3783, -30000},
> > +	{3774, -25000},
> > +	{3765, -20000},
> > +	{3756, -15000},
> > +	{3747, -10000},
> > +	{3737, -5000},
> > +	{3728, 0},
> > +	{3718, 5000},
> > +	{3708, 10000},
> > +	{3698, 15000},
> > +	{3688, 20000},
> > +	{3678, 25000},
> > +	{3667, 30000},
> > +	{3656, 35000},
> > +	{3645, 40000},
> > +	{3634, 45000},
> > +	{3623, 50000},
> > +	{3611, 55000},
> > +	{3600, 60000},
> > +	{3588, 65000},
> > +	{3575, 70000},
> > +	{3563, 75000},
> > +	{3550, 80000},
> > +	{3537, 85000},
> > +	{3524, 90000},
> > +	{3510, 95000},
> > +	{3496, 100000},
> > +	{3482, 105000},
> > +	{3467, 110000},
> > +	{3452, 115000},
> > +	{3437, 120000},
> > +	{3421, 125000},
> > +	{0, 125000},
> > +};
> > +
> > +static u32 rk_tsadcv2_temp_to_code(long temp)
> > +{
> > +	int high, low, mid;
> > +
> > +	low = 0;
> > +	high = ARRAY_SIZE(v2_code_table) - 1;
> > +	mid = (high + low) / 2;
> > +
> > +	if (temp < v2_code_table[low].temp || temp > v2_code_table[high].temp)
> > +		return 0;
> > +
> > +	while (low <= high) {
> > +		if (temp == v2_code_table[mid].temp)
> > +			return v2_code_table[mid].code;
> > +		else if (temp < v2_code_table[mid].temp)
> > +			high = mid - 1;
> > +		else
> > +			low = mid + 1;
> > +		mid = (low + high) / 2;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static long rk_tsadcv2_code_to_temp(u32 code)
> > +{
> > +	int high, low, mid;
> > +
> > +	low = 0;
> > +	high = ARRAY_SIZE(v2_code_table) - 1;
> > +	mid = (high + low) / 2;
> > +
> > +	if (code > v2_code_table[low].code || code < v2_code_table[high].code)
> > +		return 125000; /* No code available, return max temperature */
> > +
> > +	while (low <= high) {
> > +		if (code >= v2_code_table[mid].code && code <
> > +		    v2_code_table[mid - 1].code)
> > +			return v2_code_table[mid].temp;
> > +		else if (code < v2_code_table[mid].code)
> > +			low = mid + 1;
> > +		else
> > +			high = mid - 1;
> > +		mid = (low + high) / 2;
> > +	}
> > +
> > +	return 125000;
> > +}
> > +
> > +/**
> > + * rk_tsadcv2_initialize - initialize TASDC Controller
> > + * (1) Set TSADCV2_AUTO_PERIOD, configure the interleave between
> > + * every two accessing of TSADC in normal operation.
> > + * (2) Set TSADCV2_AUTO_PERIOD_HT, configure the interleave between
> > + * every two accessing of TSADC after the temperature is higher
> > + * than COM_SHUT or COM_INT.
> > + * (3) Set TSADCV2_HIGH_INT_DEBOUNCE and TSADC_HIGHT_TSHUT_DEBOUNCE,
> > + * if the temperature is higher than COMP_INT or COMP_SHUT for
> > + * "debounce" times, TSADC controller will generate interrupt or TSHUT.
> > + */
> > +static void rk_tsadcv2_initialize(void __iomem *regs,
> > +				  enum tshut_polarity tshut_polarity)
> > +{
> > +	if (tshut_polarity == TSHUT_HIGH_ACTIVE)
> > +		writel_relaxed(0 | (TSADCV2_AUTO_TSHUT_POLARITY_HIGH),
> > +			       regs + TSADCV2_AUTO_CON);
> > +	else
> > +		writel_relaxed(0 | (TSADCV2_AUTO_TSHUT_POLARITY_LOW),
> > +			       regs + TSADCV2_AUTO_CON);
> > +
> > +	writel_relaxed(TSADCV2_AUTO_PERIOD_TIME,
> > +		       regs + TSADCV2_AUTO_PERIOD);
> > +	writel_relaxed(TSADCV2_AUTO_PERIOD_HT_TIME,
> > +		       regs + TSADCV2_AUTO_PERIOD_HT);
> > +
> > +	writel_relaxed(TSADCV2_HIGHT_INT_DEBOUNCE_TIME,
> > +		       regs + TSADCV2_HIGHT_INT_DEBOUNCE);
> > +	writel_relaxed(TSADCV2_HIGHT_TSHUT_DEBOUNCE_TIME,
> > +		       regs + TSADCV2_HIGHT_TSHUT_DEBOUNCE);
> 
> SO I do not think we can keep these static, since polling frequency
> depends on base clock. On my system given values result in thermal alarm
> triggering after as long as 10 seconds after temperature crosses the
> alarm setting. We need to adjust values like:
> 
> 
> #define TSADCV2_AUTO_PERIOD_TIME 250  /* msec */
> #define TSADCV2_AUTO_PERIOD_HT_TIME 50  /* msec */
> #define TSADCV2_HIGHT_INT_DEBOUNCE_COUNT 4
> #define TSADCV2_HIGHT_TSHUT_DEBOUNCE_COUNT 4
> 
> whih will give us 1 sec and 200 msec reaction times and we shoudl set
> them as this:
> 
> 	val = TSADCV2_AUTO_PERIOD_TIME * clk_rate / 1000;
> 	writel_relaxed(val, regs + TSADCV2_AUTO_PERIOD);
> 
> etc.
> 
> > +}
> > +
> > +static void rk_tsadcv2_irq_ack(void __iomem *regs)
> > +{
> > +	u32 val;
> > +
> > +	val = readl_relaxed(regs + TSADCV2_INT_PD);
> > +	writel_relaxed(val & TSADCV2_INT_PD_CLEAR, regs + TSADCV2_INT_PD);
> > +}
> > +
> > +static int rk_tsadcv2_get_temp(int chn, void __iomem *regs, long *temp)
> > +{
> > +	u32 val;
> > +
> > +	/* the A/D value of the channel last conversion need some time */
> > +	val = readl_relaxed(regs + TSADCV2_DATA(chn));
> > +	if (val == 0)
> > +		return -EAGAIN;
> > +
> > +	*temp = rk_tsadcv2_code_to_temp(val);
> > +
> > +	return 0;
> > +}
> > +
> > +static void rk_tsadcv2_alarm_temp(int chn, void __iomem *regs, long temp)
> > +{
> > +	u32 alarm_value, int_en;
> > +
> > +	alarm_value = rk_tsadcv2_temp_to_code(temp);
> > +	writel_relaxed(alarm_value & TSADCV2_DATA_MASK,
> > +		       regs + TSADCV2_COMP_INT(chn));
> > +
> > +	int_en = readl_relaxed(regs + TSADCV2_INT_EN);
> > +	int_en |= TSADCV2_INT_SRC_EN(chn);
> > +	writel_relaxed(int_en, regs + TSADCV2_INT_EN);
> > +}
> > +
> > +static void rk_tsadcv2_tshut_temp(int chn, void __iomem *regs, long temp)
> > +{
> > +	u32 tshut_value;
> > +
> > +	tshut_value = rk_tsadcv2_temp_to_code(temp);
> > +	writel_relaxed(tshut_value, regs + TSADCV2_COMP_SHUT(chn));
> > +}
> > +
> > +static void rk_tsadcv2_tshut_mode(int chn, void __iomem *regs,
> > +				  enum tshut_mode mode)
> > +{
> > +	u32 val;
> > +
> > +	val = readl_relaxed(regs + TSADCV2_INT_EN);
> > +	if (mode == TSHUT_MODE_GPIO) {
> > +		val &= ~TSADCV2_SHUT_2CRU_SRC_EN(chn);
> > +		val |= TSADCV2_SHUT_2GPIO_SRC_EN(chn);
> > +	} else {
> > +		val &= ~TSADCV2_SHUT_2GPIO_SRC_EN(chn);
> > +		val |= TSADCV2_SHUT_2CRU_SRC_EN(chn);
> > +	}
> > +
> > +	writel_relaxed(val, regs + TSADCV2_INT_EN);
> > +}
> > +
> > +static void rk_tsadcv2_control(int chn, void __iomem *regs, bool enable)
> > +{
> > +	u32 val;
> > +
> > +	val = readl_relaxed(regs + TSADCV2_AUTO_CON);
> > +	if (enable)
> > +		val |= TSADCV2_AUTO_EN | TSADCV2_AUTO_SRC_EN(chn);
> 
> If I read the spec correctly this TSADCV2_AUTO_SRC_EN controls TSHUT
> functionality, not measurements, right? If so you need to toggle these
> bits in rk_tsadcv2_tshut_temp, and set TSADCV2_AUTO_EN separately.
> 
> > +	else
> > +		val &= ~TSADCV2_AUTO_EN;
> > +
> > +	writel_relaxed(val, regs + TSADCV2_AUTO_CON);
> > +}
> > +
> > +static const struct rockchip_tsadc_chip rk3288_tsadc_data = {
> > +	.tshut_mode = TSHUT_MODE_GPIO, /* default TSHUT via GPIO give PMIC */
> > +	.tshut_polarity = TSHUT_LOW_ACTIVE, /* default TSHUT LOW ACTIVE */
> > +	.hw_shut_temp = 120000,
> > +
> > +	.initialize = rk_tsadcv2_initialize,
> > +	.irq_ack = rk_tsadcv2_irq_ack,
> > +	.get_temp = rk_tsadcv2_get_temp,
> > +	.set_alarm_temp = rk_tsadcv2_alarm_temp,
> > +	.set_tshut_temp = rk_tsadcv2_tshut_temp,
> > +	.set_tshut_mode = rk_tsadcv2_tshut_mode,
> > +	.control = rk_tsadcv2_control,
> > +};
> > +
> > +static const struct of_device_id of_rockchip_thermal_match[] = {
> > +	{
> > +		.compatible = "rockchip,rk3288-tsadc",
> > +		.data = (void *)&rk3288_tsadc_data,
> > +	},
> > +	{ /* end */ },
> > +};
> > +MODULE_DEVICE_TABLE(of, of_rockchip_thermal_match);
> > +
> > +static void
> > +rockchip_thermal_toggle_sensor(struct rockchip_thermal_sensor *sensor, bool on)
> > +{
> > +	struct thermal_zone_device *tzd = sensor->tzd;
> > +
> > +	tzd->ops->set_mode(tzd,
> > +		on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
> > +}
> > +
> > +static irqreturn_t rockchip_thermal_alarm_irq_thread(int irq, void *dev)
> > +{
> > +	struct rockchip_thermal_data *thermal = dev;
> > +	int i;
> > +
> > +	dev_dbg(&thermal->pdev->dev, "thermal alarm\n");
> > +
> > +	thermal->chip->irq_ack(thermal->regs);
> > +
> > +	for (i = 0; i < ARRAY_SIZE(thermal->sensors); i++)
> > +		thermal_zone_device_update(thermal->sensors[i].tzd);
> > +
> > +	return IRQ_HANDLED;
> > +}
> > +
> > +static int rockchip_thermal_set_trips(void *_sensor, long low, long high)
> > +{
> > +	struct rockchip_thermal_sensor *sensor = _sensor;
> > +	struct rockchip_thermal_data *thermal = sensor->thermal;
> > +	const struct rockchip_tsadc_chip *tsadc = thermal->chip;
> > +
> > +	dev_dbg(&thermal->pdev->dev, "%s: sensor %d: low: %ld, high %ld\n",
> > +		__func__, sensor->id, low, high);
> > +
> > +	tsadc->set_alarm_temp(sensor->id, thermal->regs, high-5000);

Forgot to mention - why do we reduce alarm temperature down 5 C from the
trip point? I think we sample often enough to set the trigger exactly at
trip point.

Thanks.

-- 
Dmitry
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