Message-ID: <543E46DF.8060705@kapsi.fi>
Date:	Wed, 15 Oct 2014 13:05:19 +0300
From:	Mikko Perttunen <mikko.perttunen@...si.fi>
To:	edubezval@...il.com, swarren@...dotorg.org,
	thierry.reding@...il.com
CC:	linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	juha-matti.tilli@....fi, Mikko Perttunen <mperttunen@...dia.com>
Subject: Re: [PATCH v7 4/4] thermal: Add Tegra SOCTHERM thermal management
 driver

Eduardo: ping

Cheers,
Mikko

On 09/29/2014 05:17 PM, Mikko Perttunen wrote:
> From: Mikko Perttunen <mperttunen@...dia.com>
>
> This adds support for the Tegra SOCTHERM thermal sensing and management
> system found in the Tegra124 system-on-chip. This initial driver supports
> temperature polling for four thermal zones.
>
> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
> ---
> v7: bunch of style fixes
>
>   drivers/thermal/Kconfig          |  10 +
>   drivers/thermal/Makefile         |   1 +
>   drivers/thermal/tegra_soctherm.c | 473 +++++++++++++++++++++++++++++++++++++++
>   3 files changed, 484 insertions(+)
>   create mode 100644 drivers/thermal/tegra_soctherm.c
>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 693208e..fd9d049 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -175,6 +175,16 @@ config ARMADA_THERMAL
>   	  Enable this option if you want to have support for thermal management
>   	  controller present in Armada 370 and Armada XP SoC.
>
> +config TEGRA_SOCTHERM
> +	tristate "Tegra SOCTHERM thermal management"
> +	depends on ARCH_TEGRA
> +	help
> +	  Enable this option for integrated thermal management support on NVIDIA
> +	  Tegra124 systems-on-chip. The driver supports four thermal zones
> +	  (CPU, GPU, MEM, PLLX). Cooling devices can be bound to the thermal
> +	  zones to manage temperatures. This option is also required for the
> +	  emergency thermal reset (thermtrip) feature to function.
> +
>   config DB8500_CPUFREQ_COOLING
>   	tristate "DB8500 cpufreq cooling"
>   	depends on ARCH_U8500
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 31e232f..f0b94d5 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -33,3 +33,4 @@ obj-$(CONFIG_INTEL_SOC_DTS_THERMAL)	+= intel_soc_dts_thermal.o
>   obj-$(CONFIG_TI_SOC_THERMAL)	+= ti-soc-thermal/
>   obj-$(CONFIG_ACPI_INT3403_THERMAL)	+= int3403_thermal.o
>   obj-$(CONFIG_ST_THERMAL)	+= st/
> +obj-$(CONFIG_TEGRA_SOCTHERM)	+= tegra_soctherm.o
> diff --git a/drivers/thermal/tegra_soctherm.c b/drivers/thermal/tegra_soctherm.c
> new file mode 100644
> index 0000000..70f7e9e
> --- /dev/null
> +++ b/drivers/thermal/tegra_soctherm.c
> @@ -0,0 +1,473 @@
> +/*
> + * Copyright (c) 2014, NVIDIA CORPORATION.  All rights reserved.
> + *
> + * Author:
> + *	Mikko Perttunen <mperttunen@...dia.com>
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * 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/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +#include <linux/thermal.h>
> +
> +#include <soc/tegra/fuse.h>
> +
> +#define SENSOR_CONFIG0				0
> +#define SENSOR_CONFIG0_STOP			BIT(0)
> +#define SENSOR_CONFIG0_TALL_SHIFT		8
> +#define SENSOR_CONFIG0_TCALC_OVER		BIT(4)
> +#define SENSOR_CONFIG0_OVER			BIT(3)
> +#define SENSOR_CONFIG0_CPTR_OVER		BIT(2)
> +
> +#define SENSOR_CONFIG1				4
> +#define SENSOR_CONFIG1_TSAMPLE_SHIFT		0
> +#define SENSOR_CONFIG1_TIDDQ_EN_SHIFT		15
> +#define SENSOR_CONFIG1_TEN_COUNT_SHIFT		24
> +#define SENSOR_CONFIG1_TEMP_ENABLE		BIT(31)
> +
> +#define SENSOR_CONFIG2				8
> +#define SENSOR_CONFIG2_THERMA_SHIFT		16
> +#define SENSOR_CONFIG2_THERMB_SHIFT		0
> +
> +#define SENSOR_PDIV				0x1c0
> +#define SENSOR_PDIV_T124			0x8888
> +#define SENSOR_HOTSPOT_OFF			0x1c4
> +#define SENSOR_HOTSPOT_OFF_T124			0x00060600
> +#define SENSOR_TEMP1				0x1c8
> +#define SENSOR_TEMP2				0x1cc
> +
> +#define SENSOR_TEMP_MASK			0xffff
> +#define READBACK_VALUE_MASK			0xff00
> +#define READBACK_VALUE_SHIFT			8
> +#define READBACK_ADD_HALF			BIT(7)
> +#define READBACK_NEGATE				BIT(1)
> +
> +#define FUSE_TSENSOR8_CALIB			0x180
> +#define FUSE_SPARE_REALIGNMENT_REG_0		0x1fc
> +
> +#define FUSE_TSENSOR_CALIB_CP_TS_BASE_MASK	0x1fff
> +#define FUSE_TSENSOR_CALIB_FT_TS_BASE_MASK	(0x1fff << 13)
> +#define FUSE_TSENSOR_CALIB_FT_TS_BASE_SHIFT	13
> +
> +#define FUSE_TSENSOR8_CALIB_CP_TS_BASE_MASK	0x3ff
> +#define FUSE_TSENSOR8_CALIB_FT_TS_BASE_MASK	(0x7ff << 10)
> +#define FUSE_TSENSOR8_CALIB_FT_TS_BASE_SHIFT	10
> +
> +#define FUSE_SPARE_REALIGNMENT_REG_SHIFT_CP_MASK 0x3f
> +#define FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_MASK (0x1f << 21)
> +#define FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_SHIFT 21
> +
> +#define NOMINAL_CALIB_FT_T124			105
> +#define NOMINAL_CALIB_CP_T124			25
> +
> +struct tegra_tsensor_configuration {
> +	u32 tall, tsample, tiddq_en, ten_count, pdiv, tsample_ate, pdiv_ate;
> +};
> +
> +struct tegra_tsensor {
> +	const struct tegra_tsensor_configuration *config;
> +	u32 base, calib_fuse_offset;
> +	/* Correction values used to modify values read from calibration fuses */
> +	s32 fuse_corr_alpha, fuse_corr_beta;
> +};
> +
> +struct tegra_thermctl_zone {
> +	void __iomem *reg;
> +	unsigned int shift;
> +};
> +
> +static const struct tegra_tsensor_configuration t124_tsensor_config = {
> +	.tall = 16300,
> +	.tsample = 120,
> +	.tiddq_en = 1,
> +	.ten_count = 1,
> +	.pdiv = 8,
> +	.tsample_ate = 480,
> +	.pdiv_ate = 8
> +};
> +
> +static const struct tegra_tsensor t124_tsensors[] = {
> +	{
> +		.config = &t124_tsensor_config,
> +		.base = 0xc0,
> +		.calib_fuse_offset = 0x098,
> +		.fuse_corr_alpha = 1135400,
> +		.fuse_corr_beta = -6266900,
> +	},
> +	{
> +		.config = &t124_tsensor_config,
> +		.base = 0xe0,
> +		.calib_fuse_offset = 0x084,
> +		.fuse_corr_alpha = 1122220,
> +		.fuse_corr_beta = -5700700,
> +	},
> +	{
> +		.config = &t124_tsensor_config,
> +		.base = 0x100,
> +		.calib_fuse_offset = 0x088,
> +		.fuse_corr_alpha = 1127000,
> +		.fuse_corr_beta = -6768200,
> +	},
> +	{
> +		.config = &t124_tsensor_config,
> +		.base = 0x120,
> +		.calib_fuse_offset = 0x12c,
> +		.fuse_corr_alpha = 1110900,
> +		.fuse_corr_beta = -6232000,
> +	},
> +	{
> +		.config = &t124_tsensor_config,
> +		.base = 0x140,
> +		.calib_fuse_offset = 0x158,
> +		.fuse_corr_alpha = 1122300,
> +		.fuse_corr_beta = -5936400,
> +	},
> +	{
> +		.config = &t124_tsensor_config,
> +		.base = 0x160,
> +		.calib_fuse_offset = 0x15c,
> +		.fuse_corr_alpha = 1145700,
> +		.fuse_corr_beta = -7124600,
> +	},
> +	{
> +		.config = &t124_tsensor_config,
> +		.base = 0x180,
> +		.calib_fuse_offset = 0x154,
> +		.fuse_corr_alpha = 1120100,
> +		.fuse_corr_beta = -6000500,
> +	},
> +	{
> +		.config = &t124_tsensor_config,
> +		.base = 0x1a0,
> +		.calib_fuse_offset = 0x160,
> +		.fuse_corr_alpha = 1106500,
> +		.fuse_corr_beta = -6729300,
> +	},
> +};
> +
> +struct tegra_soctherm {
> +	struct reset_control *reset;
> +	struct clk *clock_tsensor;
> +	struct clk *clock_soctherm;
> +	void __iomem *regs;
> +
> +	struct thermal_zone_device *thermctl_tzs[4];
> +};
> +
> +struct tsensor_shared_calibration {
> +	u32 base_cp, base_ft;
> +	u32 actual_temp_cp, actual_temp_ft;
> +};
> +
> +static int calculate_shared_calibration(struct tsensor_shared_calibration *r)
> +{
> +	u32 val, shifted_cp, shifted_ft;
> +	int err;
> +
> +	err = tegra_fuse_readl(FUSE_TSENSOR8_CALIB, &val);
> +	if (err)
> +		return err;
> +	r->base_cp = val & FUSE_TSENSOR8_CALIB_CP_TS_BASE_MASK;
> +	r->base_ft = (val & FUSE_TSENSOR8_CALIB_FT_TS_BASE_MASK)
> +		>> FUSE_TSENSOR8_CALIB_FT_TS_BASE_SHIFT;
> +	val = ((val & FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_MASK)
> +		>> FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_SHIFT);
> +	shifted_ft = sign_extend32(val, 4);
> +
> +	err = tegra_fuse_readl(FUSE_SPARE_REALIGNMENT_REG_0, &val);
> +	if (err)
> +		return err;
> +	shifted_cp = sign_extend32(val, 5);
> +
> +	r->actual_temp_cp = 2 * NOMINAL_CALIB_CP_T124 + shifted_cp;
> +	r->actual_temp_ft = 2 * NOMINAL_CALIB_FT_T124 + shifted_ft;
> +
> +	return 0;
> +}
> +
> +static s64 div64_s64_precise(s64 a, s64 b)
> +{
> +	s64 r, al;
> +
> +	/* Scale up for increased precision division */
> +	al = a << 16;
> +
> +	r = div64_s64(al * 2 + 1, 2 * b);
> +	return r >> 16;
> +}
> +
> +static int
> +calculate_tsensor_calibration(const struct tegra_tsensor *sensor,
> +			      const struct tsensor_shared_calibration *shared,
> +			      u32 *calib)
> +{
> +	u32 val;
> +	s32 actual_tsensor_ft, actual_tsensor_cp, delta_sens, delta_temp,
> +	    mult, div;
> +	s16 therma, thermb;
> +	s64 tmp;
> +	int err;
> +
> +	err = tegra_fuse_readl(sensor->calib_fuse_offset, &val);
> +	if (err)
> +		return err;
> +
> +	actual_tsensor_cp = (shared->base_cp * 64) + sign_extend32(val, 12);
> +	val = (val & FUSE_TSENSOR_CALIB_FT_TS_BASE_MASK)
> +		>> FUSE_TSENSOR_CALIB_FT_TS_BASE_SHIFT;
> +	actual_tsensor_ft = (shared->base_ft * 32) + sign_extend32(val, 12);
> +
> +	delta_sens = actual_tsensor_ft - actual_tsensor_cp;
> +	delta_temp = shared->actual_temp_ft - shared->actual_temp_cp;
> +
> +	mult = sensor->config->pdiv * sensor->config->tsample_ate;
> +	div = sensor->config->tsample * sensor->config->pdiv_ate;
> +
> +	therma = div64_s64_precise((s64) delta_temp * (1LL << 13) * mult,
> +				   (s64) delta_sens * div);
> +
> +	tmp = (s64)actual_tsensor_ft * shared->actual_temp_cp -
> +	      (s64)actual_tsensor_cp * shared->actual_temp_ft;
> +	thermb = div64_s64_precise(tmp, (s64)delta_sens);
> +
> +	therma = div64_s64_precise((s64)therma * sensor->fuse_corr_alpha,
> +				   (s64)1000000LL);
> +	thermb = div64_s64_precise((s64)thermb * sensor->fuse_corr_alpha +
> +				   sensor->fuse_corr_beta, (s64)1000000LL);
> +
> +	*calib = ((u16)therma << SENSOR_CONFIG2_THERMA_SHIFT) |
> +		 ((u16)thermb << SENSOR_CONFIG2_THERMB_SHIFT);
> +
> +	return 0;
> +}
> +
> +static int enable_tsensor(struct tegra_soctherm *tegra,
> +			  const struct tegra_tsensor *sensor,
> +			  const struct tsensor_shared_calibration *shared)
> +{
> +	void __iomem *base = tegra->regs + sensor->base;
> +	unsigned int val;
> +	u32 calib;
> +	int err;
> +
> +	err = calculate_tsensor_calibration(sensor, shared, &calib);
> +	if (err)
> +		return err;
> +
> +	val = sensor->config->tall << SENSOR_CONFIG0_TALL_SHIFT;
> +	writel(val, base + SENSOR_CONFIG0);
> +
> +	val  = (sensor->config->tsample - 1) << SENSOR_CONFIG1_TSAMPLE_SHIFT;
> +	val |= sensor->config->tiddq_en << SENSOR_CONFIG1_TIDDQ_EN_SHIFT;
> +	val |= sensor->config->ten_count << SENSOR_CONFIG1_TEN_COUNT_SHIFT;
> +	val |= SENSOR_CONFIG1_TEMP_ENABLE;
> +	writel(val, base + SENSOR_CONFIG1);
> +
> +	writel(calib, base + SENSOR_CONFIG2);
> +
> +	return 0;
> +}
> +
> +/*
> + * Translate from soctherm readback format to millicelsius.
> + * The soctherm readback format in bits is as follows:
> + *   TTTTTTTT H______N
> + * where T's contain the temperature in Celsius,
> + * H denotes an addition of 0.5 Celsius and N denotes negation
> + * of the final value.
> + */
> +static long translate_temp(u16 val)
> +{
> +	long t;
> +
> +	t = ((val & READBACK_VALUE_MASK) >> READBACK_VALUE_SHIFT) * 1000;
> +	if (val & READBACK_ADD_HALF)
> +		t += 500;
> +	if (val & READBACK_NEGATE)
> +		t *= -1;
> +
> +	return t;
> +}
> +
> +static int tegra_thermctl_get_temp(void *data, long *out_temp)
> +{
> +	struct tegra_thermctl_zone *zone = data;
> +	u32 val;
> +
> +	val = (readl(zone->reg) >> zone->shift) & SENSOR_TEMP_MASK;
> +	*out_temp = translate_temp(val);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id tegra_soctherm_of_match[] = {
> +	{ .compatible = "nvidia,tegra124-soctherm" },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, tegra_soctherm_of_match);
> +
> +struct thermctl_zone_desc {
> +	unsigned int offset;
> +	unsigned int shift;
> +};
> +
> +static const struct thermctl_zone_desc t124_thermctl_temp_zones[] = {
> +	{ SENSOR_TEMP1, 16 },
> +	{ SENSOR_TEMP2, 16 },
> +	{ SENSOR_TEMP1, 0 },
> +	{ SENSOR_TEMP2, 0 }
> +};
> +
> +static int tegra_soctherm_probe(struct platform_device *pdev)
> +{
> +	struct tegra_soctherm *tegra;
> +	struct thermal_zone_device *tz;
> +	struct tsensor_shared_calibration shared_calib;
> +	struct resource *res;
> +	unsigned int i;
> +	int err;
> +
> +	const struct tegra_tsensor *tsensors = t124_tsensors;
> +
> +	tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
> +	if (!tegra)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	tegra->regs = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(tegra->regs))
> +		return PTR_ERR(tegra->regs);
> +
> +	tegra->reset = devm_reset_control_get(&pdev->dev, "soctherm");
> +	if (IS_ERR(tegra->reset)) {
> +		dev_err(&pdev->dev, "can't get soctherm reset\n");
> +		return PTR_ERR(tegra->reset);
> +	}
> +
> +	tegra->clock_tsensor = devm_clk_get(&pdev->dev, "tsensor");
> +	if (IS_ERR(tegra->clock_tsensor)) {
> +		dev_err(&pdev->dev, "can't get tsensor clock\n");
> +		return PTR_ERR(tegra->clock_tsensor);
> +	}
> +
> +	tegra->clock_soctherm = devm_clk_get(&pdev->dev, "soctherm");
> +	if (IS_ERR(tegra->clock_soctherm)) {
> +		dev_err(&pdev->dev, "can't get soctherm clock\n");
> +		return PTR_ERR(tegra->clock_soctherm);
> +	}
> +
> +	reset_control_assert(tegra->reset);
> +
> +	err = clk_prepare_enable(tegra->clock_soctherm);
> +	if (err)
> +		return err;
> +
> +	err = clk_prepare_enable(tegra->clock_tsensor);
> +	if (err) {
> +		clk_disable_unprepare(tegra->clock_soctherm);
> +		return err;
> +	}
> +
> +	reset_control_deassert(tegra->reset);
> +
> +	/* Initialize raw sensors */
> +
> +	err = calculate_shared_calibration(&shared_calib);
> +	if (err)
> +		goto disable_clocks;
> +
> +	for (i = 0; i < ARRAY_SIZE(t124_tsensors); ++i) {
> +		err = enable_tsensor(tegra, tsensors + i, &shared_calib);
> +		if (err)
> +			goto disable_clocks;
> +	}
> +
> +	writel(SENSOR_PDIV_T124, tegra->regs + SENSOR_PDIV);
> +	writel(SENSOR_HOTSPOT_OFF_T124, tegra->regs + SENSOR_HOTSPOT_OFF);
> +
> +	/* Initialize thermctl sensors */
> +
> +	for (i = 0; i < ARRAY_SIZE(tegra->thermctl_tzs); ++i) {
> +		struct tegra_thermctl_zone *zone =
> +			devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
> +		if (!zone) {
> +			err = -ENOMEM;
> +			goto unregister_tzs;
> +		}
> +
> +		zone->reg = tegra->regs + t124_thermctl_temp_zones[i].offset;
> +		zone->shift = t124_thermctl_temp_zones[i].shift;
> +
> +		tz = thermal_zone_of_sensor_register(&pdev->dev, i, zone,
> +						     tegra_thermctl_get_temp,
> +						     NULL);
> +		if (IS_ERR(tz)) {
> +			err = PTR_ERR(tz);
> +			dev_err(&pdev->dev, "failed to register sensor: %d\n",
> +				err);
> +			goto unregister_tzs;
> +		}
> +
> +		tegra->thermctl_tzs[i] = tz;
> +	}
> +
> +	return 0;
> +
> +unregister_tzs:
> +	while (i--)
> +		thermal_zone_of_sensor_unregister(&pdev->dev,
> +						  tegra->thermctl_tzs[i]);
> +
> +disable_clocks:
> +	clk_disable_unprepare(tegra->clock_tsensor);
> +	clk_disable_unprepare(tegra->clock_soctherm);
> +
> +	return err;
> +}
> +
> +static int tegra_soctherm_remove(struct platform_device *pdev)
> +{
> +	struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(tegra->thermctl_tzs); ++i) {
> +		thermal_zone_of_sensor_unregister(&pdev->dev,
> +						  tegra->thermctl_tzs[i]);
> +	}
> +
> +	clk_disable_unprepare(tegra->clock_tsensor);
> +	clk_disable_unprepare(tegra->clock_soctherm);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver tegra_soctherm_driver = {
> +	.probe = tegra_soctherm_probe,
> +	.remove = tegra_soctherm_remove,
> +	.driver = {
> +		.name = "tegra-soctherm",
> +		.of_match_table = tegra_soctherm_of_match,
> +	},
> +};
> +module_platform_driver(tegra_soctherm_driver);
> +
> +MODULE_AUTHOR("Mikko Perttunen <mperttunen@...dia.com>");
> +MODULE_DESCRIPTION("NVIDIA Tegra SOCTHERM thermal management driver");
> +MODULE_LICENSE("GPL v2");
>

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