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SubjectRe: [PATCH v6 2/2] thermal: uniphier: add UniPhier thermal driver
Hi,

On Tue, 8 Aug 2017 21:29:10 +0800 <rui.zhang@intel.com> wrote:

> On Tue, 2017-08-01 at 17:04 +0900, Kunihiko Hayashi wrote:
> > Add a thermal driver for on-chip PVT (Process, Voltage and
> > Temperature)
> > monitoring unit implemented on UniPhier SoCs. This driver supports
> > temperature monitoring and alert function.
> >
> > Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
> > ---
> > drivers/thermal/Kconfig | 8 +
> > drivers/thermal/Makefile | 1 +
> > drivers/thermal/uniphier_thermal.c | 384
> > +++++++++++++++++++++++++++++++++++++
> > 3 files changed, 393 insertions(+)
> > create mode 100644 drivers/thermal/uniphier_thermal.c
> >
> > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> > index b5b5fac..b9f2365 100644
> > --- a/drivers/thermal/Kconfig
> > +++ b/drivers/thermal/Kconfig
> > @@ -473,4 +473,12 @@ config ZX2967_THERMAL
> > the primitive temperature sensor embedded in zx2967 SoCs.
> > This sensor generates the real time die temperature.
> >
> > +config UNIPHIER_THERMAL
> > + tristate "Socionext UniPhier thermal driver"
> > + depends on ARCH_UNIPHIER || COMPILE_TEST
> > + depends on THERMAL_OF && MFD_SYSCON
> > + help
> > + Enable this to plug in UniPhier on-chip PVT thermal driver
> > into the
> > + thermal framework. The driver supports CPU thermal zone
> > temperature
> > + reporting and a couple of trip points.
>
> just one minor comments.
>
> you mentioned trip points here, but I don't find the code support.

Thank you for your comment.

The code that gets trip points from DT is in uniphier_tm_probe().
The driver gets trip points using of_thermal_get_trip_points(),
and sets the temperature values to the sensor in uniphier_tm_set_alert().

When temperature of the chip reaches the trip value,
the chip issues an interrupt and the driver calls
thermal_zone_device_update() in uniphier_tm_alarm_irq_thread().

Best Regards,
Kunihiko Hayashi

>
> thanks,
> rui
>
> > endif
> > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> > index 094d703..8b79bca 100644
> > --- a/drivers/thermal/Makefile
> > +++ b/drivers/thermal/Makefile
> > @@ -59,3 +59,4 @@ obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o
> > obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o
> > obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o
> > obj-$(CONFIG_ZX2967_THERMAL) += zx2967_thermal.o
> > +obj-$(CONFIG_UNIPHIER_THERMAL) += uniphier_thermal.o
> > diff --git a/drivers/thermal/uniphier_thermal.c
> > b/drivers/thermal/uniphier_thermal.c
> > new file mode 100644
> > index 0000000..9570473
> > --- /dev/null
> > +++ b/drivers/thermal/uniphier_thermal.c
> > @@ -0,0 +1,384 @@
> > +/**
> > + * uniphier_thermal.c - Socionext UniPhier thermal driver
> > + *
> > + * Copyright 2014 Panasonic Corporation
> > + * Copyright 2016-2017 Socionext Inc.
> > + * All rights reserved.
> > + *
> > + * Author:
> > + * Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
> > + *
> > + * This program is free software: you can redistribute it and/or
> > modify
> > + * it under the terms of the GNU General Public License version
> > 2 of
> > + * the License as published by the Free Software Foundation.
> > + *
> > + * 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/interrupt.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_device.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +#include <linux/thermal.h>
> > +
> > +#include "thermal_core.h"
> > +
> > +/*
> > + * block registers
> > + * addresses are the offset from .block_base
> > + */
> > +#define PVTCTLEN 0x0000
> > +#define PVTCTLEN_EN BIT(0)
> > +
> > +#define PVTCTLMODE 0x0004
> > +#define PVTCTLMODE_MASK 0xf
> > +#define PVTCTLMODE_TEMPMON 0x5
> > +
> > +#define EMONREPEAT 0x0040
> > +#define EMONREPEAT_ENDLESS BIT(24)
> > +#define EMONREPEAT_PERIOD GENMASK(3, 0)
> > +#define EMONREPEAT_PERIOD_1000000 0x9
> > +
> > +/*
> > + * common registers
> > + * addresses are the offset from .map_base
> > + */
> > +#define PVTCTLSEL 0x0900
> > +#define PVTCTLSEL_MASK GENMASK(2, 0)
> > +#define PVTCTLSEL_MONITOR 0
> > +
> > +#define SETALERT0 0x0910
> > +#define SETALERT1 0x0914
> > +#define SETALERT2 0x0918
> > +#define SETALERT_TEMP_OVF (GENMASK(7, 0) << 16)
> > +#define SETALERT_TEMP_OVF_VALUE(val) (((val) & GENMASK(7, 0))
> > << 16)
> > +#define SETALERT_EN BIT(0)
> > +
> > +#define PMALERTINTCTL 0x0920
> > +#define PMALERTINTCTL_CLR(ch) BIT(4 * (ch) + 2)
> > +#define PMALERTINTCTL_SET(ch) BIT(4 * (ch) + 1)
> > +#define PMALERTINTCTL_EN(ch) BIT(4 * (ch) + 0)
> > +#define PMALERTINTCTL_MASK (GENMASK(10, 8) |
> > GENMASK(6, 4) | \
> > + GENMASK(2, 0))
> > +
> > +#define TMOD 0x0928
> > +#define TMOD_WIDTH 9
> > +
> > +#define TMODCOEF 0x0e5c
> > +
> > +#define TMODSETUP0_EN BIT(30)
> > +#define TMODSETUP0_VAL(val) (((val) & GENMASK(13, 0))
> > << 16)
> > +#define TMODSETUP1_EN BIT(15)
> > +#define TMODSETUP1_VAL(val) ((val) & GENMASK(14, 0))
> > +
> > +/* SoC critical temperature */
> > +#define CRITICAL_TEMP_LIMIT (120 * 1000)
> > +
> > +/* Max # of alert channels */
> > +#define ALERT_CH_NUM 3
> > +
> > +/* SoC specific thermal sensor data */
> > +struct uniphier_tm_soc_data {
> > + u32 map_base;
> > + u32 block_base;
> > + u32 tmod_setup_addr;
> > +};
> > +
> > +struct uniphier_tm_dev {
> > + struct regmap *regmap;
> > + struct device *dev;
> > + bool alert_en[ALERT_CH_NUM];
> > + struct thermal_zone_device *tz_dev;
> > + const struct uniphier_tm_soc_data *data;
> > +};
> > +
> > +static int uniphier_tm_initialize_sensor(struct uniphier_tm_dev
> > *tdev)
> > +{
> > + struct regmap *map = tdev->regmap;
> > + u32 val;
> > + u32 tmod_calib[2];
> > + int ret;
> > +
> > + /* stop PVT */
> > + regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
> > + PVTCTLEN_EN, 0);
> > +
> > + /*
> > + * Since SoC has a calibrated value that was set in advance,
> > + * TMODCOEF shows non-zero and PVT refers the value
> > internally.
> > + *
> > + * If TMODCOEF shows zero, the boards don't have the
> > calibrated
> > + * value, and the driver has to set default value from DT.
> > + */
> > + ret = regmap_read(map, tdev->data->map_base + TMODCOEF,
> > &val);
> > + if (ret)
> > + return ret;
> > + if (!val) {
> > + /* look for the default values in DT */
> > + ret = of_property_read_u32_array(tdev->dev->of_node,
> > + "socionext,tmod-
> > calibration",
> > + tmod_calib,
> > + ARRAY_SIZE(tmod_cal
> > ib));
> > + if (ret)
> > + return ret;
> > +
> > + regmap_write(map, tdev->data->tmod_setup_addr,
> > + TMODSETUP0_EN |
> > TMODSETUP0_VAL(tmod_calib[0]) |
> > + TMODSETUP1_EN |
> > TMODSETUP1_VAL(tmod_calib[1]));
> > + }
> > +
> > + /* select temperature mode */
> > + regmap_write_bits(map, tdev->data->block_base + PVTCTLMODE,
> > + PVTCTLMODE_MASK, PVTCTLMODE_TEMPMON);
> > +
> > + /* set monitoring period */
> > + regmap_write_bits(map, tdev->data->block_base + EMONREPEAT,
> > + EMONREPEAT_ENDLESS | EMONREPEAT_PERIOD,
> > + EMONREPEAT_ENDLESS |
> > EMONREPEAT_PERIOD_1000000);
> > +
> > + /* set monitor mode */
> > + regmap_write_bits(map, tdev->data->map_base + PVTCTLSEL,
> > + PVTCTLSEL_MASK, PVTCTLSEL_MONITOR);
> > +
> > + return 0;
> > +}
> > +
> > +static void uniphier_tm_set_alert(struct uniphier_tm_dev *tdev, u32
> > ch,
> > + u32 temp)
> > +{
> > + struct regmap *map = tdev->regmap;
> > +
> > + /* set alert temperature */
> > + regmap_write_bits(map, tdev->data->map_base + SETALERT0 +
> > (ch << 2),
> > + SETALERT_EN | SETALERT_TEMP_OVF,
> > + SETALERT_EN |
> > + SETALERT_TEMP_OVF_VALUE(temp / 1000));
> > +}
> > +
> > +static void uniphier_tm_enable_sensor(struct uniphier_tm_dev *tdev)
> > +{
> > + struct regmap *map = tdev->regmap;
> > + int i;
> > + u32 bits = 0;
> > +
> > + for (i = 0; i < ALERT_CH_NUM; i++)
> > + if (tdev->alert_en[i])
> > + bits |= PMALERTINTCTL_EN(i);
> > +
> > + /* enable alert interrupt */
> > + regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
> > + PMALERTINTCTL_MASK, bits);
> > +
> > + /* start PVT */
> > + regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
> > + PVTCTLEN_EN, PVTCTLEN_EN);
> > +
> > + usleep_range(700, 1500); /* The spec note says at
> > least 700us */
> > +}
> > +
> > +static void uniphier_tm_disable_sensor(struct uniphier_tm_dev *tdev)
> > +{
> > + struct regmap *map = tdev->regmap;
> > +
> > + /* disable alert interrupt */
> > + regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
> > + PMALERTINTCTL_MASK, 0);
> > +
> > + /* stop PVT */
> > + regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
> > + PVTCTLEN_EN, 0);
> > +
> > + usleep_range(1000, 2000); /* The spec note says at
> > least 1ms */
> > +}
> > +
> > +static int uniphier_tm_get_temp(void *data, int *out_temp)
> > +{
> > + struct uniphier_tm_dev *tdev = data;
> > + struct regmap *map = tdev->regmap;
> > + int ret;
> > + u32 temp;
> > +
> > + ret = regmap_read(map, tdev->data->map_base + TMOD, &temp);
> > + if (ret)
> > + return ret;
> > +
> > + /* MSB of the TMOD field is a sign bit */
> > + *out_temp = sign_extend32(temp, TMOD_WIDTH - 1) * 1000;
> > +
> > + return 0;
> > +}
> > +
> > +static const struct thermal_zone_of_device_ops
> > uniphier_of_thermal_ops = {
> > + .get_temp = uniphier_tm_get_temp,
> > +};
> > +
> > +static void uniphier_tm_irq_clear(struct uniphier_tm_dev *tdev)
> > +{
> > + u32 mask = 0, bits = 0;
> > + int i;
> > +
> > + for (i = 0; i < ALERT_CH_NUM; i++) {
> > + mask |= (PMALERTINTCTL_CLR(i) |
> > PMALERTINTCTL_SET(i));
> > + bits |= PMALERTINTCTL_CLR(i);
> > + }
> > +
> > + /* clear alert interrupt */
> > + regmap_write_bits(tdev->regmap,
> > + tdev->data->map_base + PMALERTINTCTL,
> > mask, bits);
> > +}
> > +
> > +static irqreturn_t uniphier_tm_alarm_irq(int irq, void *_tdev)
> > +{
> > + struct uniphier_tm_dev *tdev = _tdev;
> > +
> > + disable_irq_nosync(irq);
> > + uniphier_tm_irq_clear(tdev);
> > +
> > + return IRQ_WAKE_THREAD;
> > +}
> > +
> > +static irqreturn_t uniphier_tm_alarm_irq_thread(int irq, void
> > *_tdev)
> > +{
> > + struct uniphier_tm_dev *tdev = _tdev;
> > +
> > + thermal_zone_device_update(tdev->tz_dev,
> > THERMAL_EVENT_UNSPECIFIED);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int uniphier_tm_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct regmap *regmap;
> > + struct device_node *parent;
> > + struct uniphier_tm_dev *tdev;
> > + const struct thermal_trip *trips;
> > + int i, ret, irq, ntrips, crit_temp = INT_MAX;
> > +
> > + tdev = devm_kzalloc(dev, sizeof(*tdev), GFP_KERNEL);
> > + if (!tdev)
> > + return -ENOMEM;
> > + tdev->dev = dev;
> > +
> > + tdev->data = of_device_get_match_data(dev);
> > + if (WARN_ON(!tdev->data))
> > + return -EINVAL;
> > +
> > + irq = platform_get_irq(pdev, 0);
> > + if (irq < 0)
> > + return irq;
> > +
> > + /* get regmap from syscon node */
> > + parent = of_get_parent(dev->of_node); /* parent should be
> > syscon node */
> > + regmap = syscon_node_to_regmap(parent);
> > + of_node_put(parent);
> > + if (IS_ERR(regmap)) {
> > + dev_err(dev, "failed to get regmap (error %ld)\n",
> > + PTR_ERR(regmap));
> > + return PTR_ERR(regmap);
> > + }
> > + tdev->regmap = regmap;
> > +
> > + ret = uniphier_tm_initialize_sensor(tdev);
> > + if (ret) {
> > + dev_err(dev, "failed to initialize sensor\n");
> > + return ret;
> > + }
> > +
> > + ret = devm_request_threaded_irq(dev, irq,
> > uniphier_tm_alarm_irq,
> > + uniphier_tm_alarm_irq_thread
> > ,
> > + 0, "thermal", tdev);
> > + if (ret)
> > + return ret;
> > +
> > + platform_set_drvdata(pdev, tdev);
> > +
> > + tdev->tz_dev = devm_thermal_zone_of_sensor_register(dev, 0,
> > tdev,
> > + &uniphier_of_thermal
> > _ops);
> > + if (IS_ERR(tdev->tz_dev)) {
> > + dev_err(dev, "failed to register sensor device\n");
> > + return PTR_ERR(tdev->tz_dev);
> > + }
> > +
> > + /* get trip points */
> > + trips = of_thermal_get_trip_points(tdev->tz_dev);
> > + ntrips = of_thermal_get_ntrips(tdev->tz_dev);
> > + if (ntrips > ALERT_CH_NUM) {
> > + dev_err(dev, "thermal zone has too many trips\n");
> > + return -E2BIG;
> > + }
> > +
> > + /* set alert temperatures */
> > + for (i = 0; i < ntrips; i++) {
> > + if (trips[i].type == THERMAL_TRIP_CRITICAL &&
> > + trips[i].temperature < crit_temp)
> > + crit_temp = trips[i].temperature;
> > + uniphier_tm_set_alert(tdev, i,
> > trips[i].temperature);
> > + tdev->alert_en[i] = true;
> > + }
> > + if (crit_temp > CRITICAL_TEMP_LIMIT) {
> > + dev_err(dev, "critical trip is over limit(>%d), or
> > not set\n",
> > + CRITICAL_TEMP_LIMIT);
> > + return -EINVAL;
> > + }
> > +
> > + uniphier_tm_enable_sensor(tdev);
> > +
> > + return 0;
> > +}
> > +
> > +static int uniphier_tm_remove(struct platform_device *pdev)
> > +{
> > + struct uniphier_tm_dev *tdev = platform_get_drvdata(pdev);
> > +
> > + /* disable sensor */
> > + uniphier_tm_disable_sensor(tdev);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct uniphier_tm_soc_data uniphier_pxs2_tm_data = {
> > + .map_base = 0xe000,
> > + .block_base = 0xe000,
> > + .tmod_setup_addr = 0xe904,
> > +};
> > +
> > +static const struct uniphier_tm_soc_data uniphier_ld20_tm_data = {
> > + .map_base = 0xe000,
> > + .block_base = 0xe800,
> > + .tmod_setup_addr = 0xe938,
> > +};
> > +
> > +static const struct of_device_id uniphier_tm_dt_ids[] = {
> > + {
> > + .compatible = "socionext,uniphier-pxs2-thermal",
> > + .data = &uniphier_pxs2_tm_data,
> > + },
> > + {
> > + .compatible = "socionext,uniphier-ld20-thermal",
> > + .data = &uniphier_ld20_tm_data,
> > + },
> > + { /* sentinel */ }
> > +};
> > +MODULE_DEVICE_TABLE(of, uniphier_tm_dt_ids);
> > +
> > +static struct platform_driver uniphier_tm_driver = {
> > + .probe = uniphier_tm_probe,
> > + .remove = uniphier_tm_remove,
> > + .driver = {
> > + .name = "uniphier-thermal",
> > + .of_match_table = uniphier_tm_dt_ids,
> > + },
> > +};
> > +module_platform_driver(uniphier_tm_driver);
> > +
> > +MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
> > +MODULE_DESCRIPTION("UniPhier thermal driver");
> > +MODULE_LICENSE("GPL v2");



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